1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
4 *
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 */
34
35 #include <linux/file.h>
36 #include <linux/fs.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
45 #include <linux/string_helpers.h>
46 #include <linux/fsnotify.h>
47 #include <linux/nfs_ssc.h>
48 #include "xdr4.h"
49 #include "xdr4cb.h"
50 #include "vfs.h"
51 #include "current_stateid.h"
52
53 #include "netns.h"
54 #include "pnfs.h"
55 #include "filecache.h"
56 #include "trace.h"
57
58 #define NFSDDBG_FACILITY NFSDDBG_PROC
59
60 #define all_ones {{~0,~0},~0}
61 static const stateid_t one_stateid = {
62 .si_generation = ~0,
63 .si_opaque = all_ones,
64 };
65 static const stateid_t zero_stateid = {
66 /* all fields zero */
67 };
68 static const stateid_t currentstateid = {
69 .si_generation = 1,
70 };
71 static const stateid_t close_stateid = {
72 .si_generation = 0xffffffffU,
73 };
74
75 static u64 current_sessionid = 1;
76
77 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
78 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
79 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
80 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
81
82 /* forward declarations */
83 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
84 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
85 void nfsd4_end_grace(struct nfsd_net *nn);
86 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
87
88 /* Locking: */
89
90 /*
91 * Currently used for the del_recall_lru and file hash table. In an
92 * effort to decrease the scope of the client_mutex, this spinlock may
93 * eventually cover more:
94 */
95 static DEFINE_SPINLOCK(state_lock);
96
97 enum nfsd4_st_mutex_lock_subclass {
98 OPEN_STATEID_MUTEX = 0,
99 LOCK_STATEID_MUTEX = 1,
100 };
101
102 /*
103 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
104 * the refcount on the open stateid to drop.
105 */
106 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
107
108 /*
109 * A waitqueue where a writer to clients/#/ctl destroying a client can
110 * wait for cl_rpc_users to drop to 0 and then for the client to be
111 * unhashed.
112 */
113 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
114
115 static struct kmem_cache *client_slab;
116 static struct kmem_cache *openowner_slab;
117 static struct kmem_cache *lockowner_slab;
118 static struct kmem_cache *file_slab;
119 static struct kmem_cache *stateid_slab;
120 static struct kmem_cache *deleg_slab;
121 static struct kmem_cache *odstate_slab;
122
123 static void free_session(struct nfsd4_session *);
124
125 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
126 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
127
128 static struct workqueue_struct *laundry_wq;
129
nfsd4_create_laundry_wq(void)130 int nfsd4_create_laundry_wq(void)
131 {
132 int rc = 0;
133
134 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
135 if (laundry_wq == NULL)
136 rc = -ENOMEM;
137 return rc;
138 }
139
nfsd4_destroy_laundry_wq(void)140 void nfsd4_destroy_laundry_wq(void)
141 {
142 destroy_workqueue(laundry_wq);
143 }
144
is_session_dead(struct nfsd4_session * ses)145 static bool is_session_dead(struct nfsd4_session *ses)
146 {
147 return ses->se_flags & NFS4_SESSION_DEAD;
148 }
149
mark_session_dead_locked(struct nfsd4_session * ses,int ref_held_by_me)150 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
151 {
152 if (atomic_read(&ses->se_ref) > ref_held_by_me)
153 return nfserr_jukebox;
154 ses->se_flags |= NFS4_SESSION_DEAD;
155 return nfs_ok;
156 }
157
is_client_expired(struct nfs4_client * clp)158 static bool is_client_expired(struct nfs4_client *clp)
159 {
160 return clp->cl_time == 0;
161 }
162
nfsd4_dec_courtesy_client_count(struct nfsd_net * nn,struct nfs4_client * clp)163 static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
164 struct nfs4_client *clp)
165 {
166 if (clp->cl_state != NFSD4_ACTIVE)
167 atomic_add_unless(&nn->nfsd_courtesy_clients, -1, 0);
168 }
169
get_client_locked(struct nfs4_client * clp)170 static __be32 get_client_locked(struct nfs4_client *clp)
171 {
172 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
173
174 lockdep_assert_held(&nn->client_lock);
175
176 if (is_client_expired(clp))
177 return nfserr_expired;
178 atomic_inc(&clp->cl_rpc_users);
179 nfsd4_dec_courtesy_client_count(nn, clp);
180 clp->cl_state = NFSD4_ACTIVE;
181 return nfs_ok;
182 }
183
184 /* must be called under the client_lock */
185 static inline void
renew_client_locked(struct nfs4_client * clp)186 renew_client_locked(struct nfs4_client *clp)
187 {
188 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
189
190 if (is_client_expired(clp)) {
191 WARN_ON(1);
192 printk("%s: client (clientid %08x/%08x) already expired\n",
193 __func__,
194 clp->cl_clientid.cl_boot,
195 clp->cl_clientid.cl_id);
196 return;
197 }
198
199 list_move_tail(&clp->cl_lru, &nn->client_lru);
200 clp->cl_time = ktime_get_boottime_seconds();
201 nfsd4_dec_courtesy_client_count(nn, clp);
202 clp->cl_state = NFSD4_ACTIVE;
203 }
204
put_client_renew_locked(struct nfs4_client * clp)205 static void put_client_renew_locked(struct nfs4_client *clp)
206 {
207 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
208
209 lockdep_assert_held(&nn->client_lock);
210
211 if (!atomic_dec_and_test(&clp->cl_rpc_users))
212 return;
213 if (!is_client_expired(clp))
214 renew_client_locked(clp);
215 else
216 wake_up_all(&expiry_wq);
217 }
218
put_client_renew(struct nfs4_client * clp)219 static void put_client_renew(struct nfs4_client *clp)
220 {
221 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
222
223 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
224 return;
225 if (!is_client_expired(clp))
226 renew_client_locked(clp);
227 else
228 wake_up_all(&expiry_wq);
229 spin_unlock(&nn->client_lock);
230 }
231
nfsd4_get_session_locked(struct nfsd4_session * ses)232 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
233 {
234 __be32 status;
235
236 if (is_session_dead(ses))
237 return nfserr_badsession;
238 status = get_client_locked(ses->se_client);
239 if (status)
240 return status;
241 atomic_inc(&ses->se_ref);
242 return nfs_ok;
243 }
244
nfsd4_put_session_locked(struct nfsd4_session * ses)245 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
246 {
247 struct nfs4_client *clp = ses->se_client;
248 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
249
250 lockdep_assert_held(&nn->client_lock);
251
252 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
253 free_session(ses);
254 put_client_renew_locked(clp);
255 }
256
nfsd4_put_session(struct nfsd4_session * ses)257 static void nfsd4_put_session(struct nfsd4_session *ses)
258 {
259 struct nfs4_client *clp = ses->se_client;
260 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
261
262 spin_lock(&nn->client_lock);
263 nfsd4_put_session_locked(ses);
264 spin_unlock(&nn->client_lock);
265 }
266
267 static struct nfsd4_blocked_lock *
find_blocked_lock(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)268 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
269 struct nfsd_net *nn)
270 {
271 struct nfsd4_blocked_lock *cur, *found = NULL;
272
273 spin_lock(&nn->blocked_locks_lock);
274 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
275 if (fh_match(fh, &cur->nbl_fh)) {
276 list_del_init(&cur->nbl_list);
277 WARN_ON(list_empty(&cur->nbl_lru));
278 list_del_init(&cur->nbl_lru);
279 found = cur;
280 break;
281 }
282 }
283 spin_unlock(&nn->blocked_locks_lock);
284 if (found)
285 locks_delete_block(&found->nbl_lock);
286 return found;
287 }
288
289 static struct nfsd4_blocked_lock *
find_or_allocate_block(struct nfs4_lockowner * lo,struct knfsd_fh * fh,struct nfsd_net * nn)290 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
291 struct nfsd_net *nn)
292 {
293 struct nfsd4_blocked_lock *nbl;
294
295 nbl = find_blocked_lock(lo, fh, nn);
296 if (!nbl) {
297 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
298 if (nbl) {
299 INIT_LIST_HEAD(&nbl->nbl_list);
300 INIT_LIST_HEAD(&nbl->nbl_lru);
301 fh_copy_shallow(&nbl->nbl_fh, fh);
302 locks_init_lock(&nbl->nbl_lock);
303 kref_init(&nbl->nbl_kref);
304 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
305 &nfsd4_cb_notify_lock_ops,
306 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
307 }
308 }
309 return nbl;
310 }
311
312 static void
free_nbl(struct kref * kref)313 free_nbl(struct kref *kref)
314 {
315 struct nfsd4_blocked_lock *nbl;
316
317 nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
318 kfree(nbl);
319 }
320
321 static void
free_blocked_lock(struct nfsd4_blocked_lock * nbl)322 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
323 {
324 locks_delete_block(&nbl->nbl_lock);
325 locks_release_private(&nbl->nbl_lock);
326 kref_put(&nbl->nbl_kref, free_nbl);
327 }
328
329 static void
remove_blocked_locks(struct nfs4_lockowner * lo)330 remove_blocked_locks(struct nfs4_lockowner *lo)
331 {
332 struct nfs4_client *clp = lo->lo_owner.so_client;
333 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
334 struct nfsd4_blocked_lock *nbl;
335 LIST_HEAD(reaplist);
336
337 /* Dequeue all blocked locks */
338 spin_lock(&nn->blocked_locks_lock);
339 while (!list_empty(&lo->lo_blocked)) {
340 nbl = list_first_entry(&lo->lo_blocked,
341 struct nfsd4_blocked_lock,
342 nbl_list);
343 list_del_init(&nbl->nbl_list);
344 WARN_ON(list_empty(&nbl->nbl_lru));
345 list_move(&nbl->nbl_lru, &reaplist);
346 }
347 spin_unlock(&nn->blocked_locks_lock);
348
349 /* Now free them */
350 while (!list_empty(&reaplist)) {
351 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
352 nbl_lru);
353 list_del_init(&nbl->nbl_lru);
354 free_blocked_lock(nbl);
355 }
356 }
357
358 static void
nfsd4_cb_notify_lock_prepare(struct nfsd4_callback * cb)359 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
360 {
361 struct nfsd4_blocked_lock *nbl = container_of(cb,
362 struct nfsd4_blocked_lock, nbl_cb);
363 locks_delete_block(&nbl->nbl_lock);
364 }
365
366 static int
nfsd4_cb_notify_lock_done(struct nfsd4_callback * cb,struct rpc_task * task)367 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
368 {
369 trace_nfsd_cb_notify_lock_done(&zero_stateid, task);
370
371 /*
372 * Since this is just an optimization, we don't try very hard if it
373 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
374 * just quit trying on anything else.
375 */
376 switch (task->tk_status) {
377 case -NFS4ERR_DELAY:
378 rpc_delay(task, 1 * HZ);
379 return 0;
380 default:
381 return 1;
382 }
383 }
384
385 static void
nfsd4_cb_notify_lock_release(struct nfsd4_callback * cb)386 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
387 {
388 struct nfsd4_blocked_lock *nbl = container_of(cb,
389 struct nfsd4_blocked_lock, nbl_cb);
390
391 free_blocked_lock(nbl);
392 }
393
394 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
395 .prepare = nfsd4_cb_notify_lock_prepare,
396 .done = nfsd4_cb_notify_lock_done,
397 .release = nfsd4_cb_notify_lock_release,
398 };
399
400 /*
401 * We store the NONE, READ, WRITE, and BOTH bits separately in the
402 * st_{access,deny}_bmap field of the stateid, in order to track not
403 * only what share bits are currently in force, but also what
404 * combinations of share bits previous opens have used. This allows us
405 * to enforce the recommendation in
406 * https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
407 * the server return an error if the client attempt to downgrade to a
408 * combination of share bits not explicable by closing some of its
409 * previous opens.
410 *
411 * This enforcement is arguably incomplete, since we don't keep
412 * track of access/deny bit combinations; so, e.g., we allow:
413 *
414 * OPEN allow read, deny write
415 * OPEN allow both, deny none
416 * DOWNGRADE allow read, deny none
417 *
418 * which we should reject.
419 *
420 * But you could also argue that our current code is already overkill,
421 * since it only exists to return NFS4ERR_INVAL on incorrect client
422 * behavior.
423 */
424 static unsigned int
bmap_to_share_mode(unsigned long bmap)425 bmap_to_share_mode(unsigned long bmap)
426 {
427 int i;
428 unsigned int access = 0;
429
430 for (i = 1; i < 4; i++) {
431 if (test_bit(i, &bmap))
432 access |= i;
433 }
434 return access;
435 }
436
437 /* set share access for a given stateid */
438 static inline void
set_access(u32 access,struct nfs4_ol_stateid * stp)439 set_access(u32 access, struct nfs4_ol_stateid *stp)
440 {
441 unsigned char mask = 1 << access;
442
443 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
444 stp->st_access_bmap |= mask;
445 }
446
447 /* clear share access for a given stateid */
448 static inline void
clear_access(u32 access,struct nfs4_ol_stateid * stp)449 clear_access(u32 access, struct nfs4_ol_stateid *stp)
450 {
451 unsigned char mask = 1 << access;
452
453 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
454 stp->st_access_bmap &= ~mask;
455 }
456
457 /* test whether a given stateid has access */
458 static inline bool
test_access(u32 access,struct nfs4_ol_stateid * stp)459 test_access(u32 access, struct nfs4_ol_stateid *stp)
460 {
461 unsigned char mask = 1 << access;
462
463 return (bool)(stp->st_access_bmap & mask);
464 }
465
466 /* set share deny for a given stateid */
467 static inline void
set_deny(u32 deny,struct nfs4_ol_stateid * stp)468 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
469 {
470 unsigned char mask = 1 << deny;
471
472 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
473 stp->st_deny_bmap |= mask;
474 }
475
476 /* clear share deny for a given stateid */
477 static inline void
clear_deny(u32 deny,struct nfs4_ol_stateid * stp)478 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
479 {
480 unsigned char mask = 1 << deny;
481
482 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
483 stp->st_deny_bmap &= ~mask;
484 }
485
486 /* test whether a given stateid is denying specific access */
487 static inline bool
test_deny(u32 deny,struct nfs4_ol_stateid * stp)488 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
489 {
490 unsigned char mask = 1 << deny;
491
492 return (bool)(stp->st_deny_bmap & mask);
493 }
494
nfs4_access_to_omode(u32 access)495 static int nfs4_access_to_omode(u32 access)
496 {
497 switch (access & NFS4_SHARE_ACCESS_BOTH) {
498 case NFS4_SHARE_ACCESS_READ:
499 return O_RDONLY;
500 case NFS4_SHARE_ACCESS_WRITE:
501 return O_WRONLY;
502 case NFS4_SHARE_ACCESS_BOTH:
503 return O_RDWR;
504 }
505 WARN_ON_ONCE(1);
506 return O_RDONLY;
507 }
508
509 static inline int
access_permit_read(struct nfs4_ol_stateid * stp)510 access_permit_read(struct nfs4_ol_stateid *stp)
511 {
512 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
513 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
514 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
515 }
516
517 static inline int
access_permit_write(struct nfs4_ol_stateid * stp)518 access_permit_write(struct nfs4_ol_stateid *stp)
519 {
520 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
521 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
522 }
523
524 static inline struct nfs4_stateowner *
nfs4_get_stateowner(struct nfs4_stateowner * sop)525 nfs4_get_stateowner(struct nfs4_stateowner *sop)
526 {
527 atomic_inc(&sop->so_count);
528 return sop;
529 }
530
531 static int
same_owner_str(struct nfs4_stateowner * sop,struct xdr_netobj * owner)532 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
533 {
534 return (sop->so_owner.len == owner->len) &&
535 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
536 }
537
538 static struct nfs4_openowner *
find_openstateowner_str_locked(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)539 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
540 struct nfs4_client *clp)
541 {
542 struct nfs4_stateowner *so;
543
544 lockdep_assert_held(&clp->cl_lock);
545
546 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
547 so_strhash) {
548 if (!so->so_is_open_owner)
549 continue;
550 if (same_owner_str(so, &open->op_owner))
551 return openowner(nfs4_get_stateowner(so));
552 }
553 return NULL;
554 }
555
556 static struct nfs4_openowner *
find_openstateowner_str(unsigned int hashval,struct nfsd4_open * open,struct nfs4_client * clp)557 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
558 struct nfs4_client *clp)
559 {
560 struct nfs4_openowner *oo;
561
562 spin_lock(&clp->cl_lock);
563 oo = find_openstateowner_str_locked(hashval, open, clp);
564 spin_unlock(&clp->cl_lock);
565 return oo;
566 }
567
568 static inline u32
opaque_hashval(const void * ptr,int nbytes)569 opaque_hashval(const void *ptr, int nbytes)
570 {
571 unsigned char *cptr = (unsigned char *) ptr;
572
573 u32 x = 0;
574 while (nbytes--) {
575 x *= 37;
576 x += *cptr++;
577 }
578 return x;
579 }
580
nfsd4_free_file_rcu(struct rcu_head * rcu)581 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
582 {
583 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
584
585 kmem_cache_free(file_slab, fp);
586 }
587
588 void
put_nfs4_file(struct nfs4_file * fi)589 put_nfs4_file(struct nfs4_file *fi)
590 {
591 might_lock(&state_lock);
592
593 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
594 hlist_del_rcu(&fi->fi_hash);
595 spin_unlock(&state_lock);
596 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
597 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
598 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
599 }
600 }
601
602 static struct nfsd_file *
__nfs4_get_fd(struct nfs4_file * f,int oflag)603 __nfs4_get_fd(struct nfs4_file *f, int oflag)
604 {
605 if (f->fi_fds[oflag])
606 return nfsd_file_get(f->fi_fds[oflag]);
607 return NULL;
608 }
609
610 static struct nfsd_file *
find_writeable_file_locked(struct nfs4_file * f)611 find_writeable_file_locked(struct nfs4_file *f)
612 {
613 struct nfsd_file *ret;
614
615 lockdep_assert_held(&f->fi_lock);
616
617 ret = __nfs4_get_fd(f, O_WRONLY);
618 if (!ret)
619 ret = __nfs4_get_fd(f, O_RDWR);
620 return ret;
621 }
622
623 static struct nfsd_file *
find_writeable_file(struct nfs4_file * f)624 find_writeable_file(struct nfs4_file *f)
625 {
626 struct nfsd_file *ret;
627
628 spin_lock(&f->fi_lock);
629 ret = find_writeable_file_locked(f);
630 spin_unlock(&f->fi_lock);
631
632 return ret;
633 }
634
635 static struct nfsd_file *
find_readable_file_locked(struct nfs4_file * f)636 find_readable_file_locked(struct nfs4_file *f)
637 {
638 struct nfsd_file *ret;
639
640 lockdep_assert_held(&f->fi_lock);
641
642 ret = __nfs4_get_fd(f, O_RDONLY);
643 if (!ret)
644 ret = __nfs4_get_fd(f, O_RDWR);
645 return ret;
646 }
647
648 static struct nfsd_file *
find_readable_file(struct nfs4_file * f)649 find_readable_file(struct nfs4_file *f)
650 {
651 struct nfsd_file *ret;
652
653 spin_lock(&f->fi_lock);
654 ret = find_readable_file_locked(f);
655 spin_unlock(&f->fi_lock);
656
657 return ret;
658 }
659
660 struct nfsd_file *
find_any_file(struct nfs4_file * f)661 find_any_file(struct nfs4_file *f)
662 {
663 struct nfsd_file *ret;
664
665 if (!f)
666 return NULL;
667 spin_lock(&f->fi_lock);
668 ret = __nfs4_get_fd(f, O_RDWR);
669 if (!ret) {
670 ret = __nfs4_get_fd(f, O_WRONLY);
671 if (!ret)
672 ret = __nfs4_get_fd(f, O_RDONLY);
673 }
674 spin_unlock(&f->fi_lock);
675 return ret;
676 }
677
find_deleg_file(struct nfs4_file * f)678 static struct nfsd_file *find_deleg_file(struct nfs4_file *f)
679 {
680 struct nfsd_file *ret = NULL;
681
682 spin_lock(&f->fi_lock);
683 if (f->fi_deleg_file)
684 ret = nfsd_file_get(f->fi_deleg_file);
685 spin_unlock(&f->fi_lock);
686 return ret;
687 }
688
689 static atomic_long_t num_delegations;
690 unsigned long max_delegations;
691
692 /*
693 * Open owner state (share locks)
694 */
695
696 /* hash tables for lock and open owners */
697 #define OWNER_HASH_BITS 8
698 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
699 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
700
ownerstr_hashval(struct xdr_netobj * ownername)701 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
702 {
703 unsigned int ret;
704
705 ret = opaque_hashval(ownername->data, ownername->len);
706 return ret & OWNER_HASH_MASK;
707 }
708
709 /* hash table for nfs4_file */
710 #define FILE_HASH_BITS 8
711 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
712
file_hashval(struct svc_fh * fh)713 static unsigned int file_hashval(struct svc_fh *fh)
714 {
715 struct inode *inode = d_inode(fh->fh_dentry);
716
717 /* XXX: why not (here & in file cache) use inode? */
718 return (unsigned int)hash_long(inode->i_ino, FILE_HASH_BITS);
719 }
720
721 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
722
723 /*
724 * Check if courtesy clients have conflicting access and resolve it if possible
725 *
726 * access: is op_share_access if share_access is true.
727 * Check if access mode, op_share_access, would conflict with
728 * the current deny mode of the file 'fp'.
729 * access: is op_share_deny if share_access is false.
730 * Check if the deny mode, op_share_deny, would conflict with
731 * current access of the file 'fp'.
732 * stp: skip checking this entry.
733 * new_stp: normal open, not open upgrade.
734 *
735 * Function returns:
736 * false - access/deny mode conflict with normal client.
737 * true - no conflict or conflict with courtesy client(s) is resolved.
738 */
739 static bool
nfs4_resolve_deny_conflicts_locked(struct nfs4_file * fp,bool new_stp,struct nfs4_ol_stateid * stp,u32 access,bool share_access)740 nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
741 struct nfs4_ol_stateid *stp, u32 access, bool share_access)
742 {
743 struct nfs4_ol_stateid *st;
744 bool resolvable = true;
745 unsigned char bmap;
746 struct nfsd_net *nn;
747 struct nfs4_client *clp;
748
749 lockdep_assert_held(&fp->fi_lock);
750 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
751 /* ignore lock stateid */
752 if (st->st_openstp)
753 continue;
754 if (st == stp && new_stp)
755 continue;
756 /* check file access against deny mode or vice versa */
757 bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
758 if (!(access & bmap_to_share_mode(bmap)))
759 continue;
760 clp = st->st_stid.sc_client;
761 if (try_to_expire_client(clp))
762 continue;
763 resolvable = false;
764 break;
765 }
766 if (resolvable) {
767 clp = stp->st_stid.sc_client;
768 nn = net_generic(clp->net, nfsd_net_id);
769 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
770 }
771 return resolvable;
772 }
773
774 static void
__nfs4_file_get_access(struct nfs4_file * fp,u32 access)775 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
776 {
777 lockdep_assert_held(&fp->fi_lock);
778
779 if (access & NFS4_SHARE_ACCESS_WRITE)
780 atomic_inc(&fp->fi_access[O_WRONLY]);
781 if (access & NFS4_SHARE_ACCESS_READ)
782 atomic_inc(&fp->fi_access[O_RDONLY]);
783 }
784
785 static __be32
nfs4_file_get_access(struct nfs4_file * fp,u32 access)786 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
787 {
788 lockdep_assert_held(&fp->fi_lock);
789
790 /* Does this access mode make sense? */
791 if (access & ~NFS4_SHARE_ACCESS_BOTH)
792 return nfserr_inval;
793
794 /* Does it conflict with a deny mode already set? */
795 if ((access & fp->fi_share_deny) != 0)
796 return nfserr_share_denied;
797
798 __nfs4_file_get_access(fp, access);
799 return nfs_ok;
800 }
801
nfs4_file_check_deny(struct nfs4_file * fp,u32 deny)802 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
803 {
804 /* Common case is that there is no deny mode. */
805 if (deny) {
806 /* Does this deny mode make sense? */
807 if (deny & ~NFS4_SHARE_DENY_BOTH)
808 return nfserr_inval;
809
810 if ((deny & NFS4_SHARE_DENY_READ) &&
811 atomic_read(&fp->fi_access[O_RDONLY]))
812 return nfserr_share_denied;
813
814 if ((deny & NFS4_SHARE_DENY_WRITE) &&
815 atomic_read(&fp->fi_access[O_WRONLY]))
816 return nfserr_share_denied;
817 }
818 return nfs_ok;
819 }
820
__nfs4_file_put_access(struct nfs4_file * fp,int oflag)821 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
822 {
823 might_lock(&fp->fi_lock);
824
825 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
826 struct nfsd_file *f1 = NULL;
827 struct nfsd_file *f2 = NULL;
828
829 swap(f1, fp->fi_fds[oflag]);
830 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
831 swap(f2, fp->fi_fds[O_RDWR]);
832 spin_unlock(&fp->fi_lock);
833 if (f1)
834 nfsd_file_close(f1);
835 if (f2)
836 nfsd_file_close(f2);
837 }
838 }
839
nfs4_file_put_access(struct nfs4_file * fp,u32 access)840 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
841 {
842 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
843
844 if (access & NFS4_SHARE_ACCESS_WRITE)
845 __nfs4_file_put_access(fp, O_WRONLY);
846 if (access & NFS4_SHARE_ACCESS_READ)
847 __nfs4_file_put_access(fp, O_RDONLY);
848 }
849
850 /*
851 * Allocate a new open/delegation state counter. This is needed for
852 * pNFS for proper return on close semantics.
853 *
854 * Note that we only allocate it for pNFS-enabled exports, otherwise
855 * all pointers to struct nfs4_clnt_odstate are always NULL.
856 */
857 static struct nfs4_clnt_odstate *
alloc_clnt_odstate(struct nfs4_client * clp)858 alloc_clnt_odstate(struct nfs4_client *clp)
859 {
860 struct nfs4_clnt_odstate *co;
861
862 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
863 if (co) {
864 co->co_client = clp;
865 refcount_set(&co->co_odcount, 1);
866 }
867 return co;
868 }
869
870 static void
hash_clnt_odstate_locked(struct nfs4_clnt_odstate * co)871 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
872 {
873 struct nfs4_file *fp = co->co_file;
874
875 lockdep_assert_held(&fp->fi_lock);
876 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
877 }
878
879 static inline void
get_clnt_odstate(struct nfs4_clnt_odstate * co)880 get_clnt_odstate(struct nfs4_clnt_odstate *co)
881 {
882 if (co)
883 refcount_inc(&co->co_odcount);
884 }
885
886 static void
put_clnt_odstate(struct nfs4_clnt_odstate * co)887 put_clnt_odstate(struct nfs4_clnt_odstate *co)
888 {
889 struct nfs4_file *fp;
890
891 if (!co)
892 return;
893
894 fp = co->co_file;
895 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
896 list_del(&co->co_perfile);
897 spin_unlock(&fp->fi_lock);
898
899 nfsd4_return_all_file_layouts(co->co_client, fp);
900 kmem_cache_free(odstate_slab, co);
901 }
902 }
903
904 static struct nfs4_clnt_odstate *
find_or_hash_clnt_odstate(struct nfs4_file * fp,struct nfs4_clnt_odstate * new)905 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
906 {
907 struct nfs4_clnt_odstate *co;
908 struct nfs4_client *cl;
909
910 if (!new)
911 return NULL;
912
913 cl = new->co_client;
914
915 spin_lock(&fp->fi_lock);
916 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
917 if (co->co_client == cl) {
918 get_clnt_odstate(co);
919 goto out;
920 }
921 }
922 co = new;
923 co->co_file = fp;
924 hash_clnt_odstate_locked(new);
925 out:
926 spin_unlock(&fp->fi_lock);
927 return co;
928 }
929
nfs4_alloc_stid(struct nfs4_client * cl,struct kmem_cache * slab,void (* sc_free)(struct nfs4_stid *))930 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
931 void (*sc_free)(struct nfs4_stid *))
932 {
933 struct nfs4_stid *stid;
934 int new_id;
935
936 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
937 if (!stid)
938 return NULL;
939
940 idr_preload(GFP_KERNEL);
941 spin_lock(&cl->cl_lock);
942 /* Reserving 0 for start of file in nfsdfs "states" file: */
943 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
944 spin_unlock(&cl->cl_lock);
945 idr_preload_end();
946 if (new_id < 0)
947 goto out_free;
948
949 stid->sc_free = sc_free;
950 stid->sc_client = cl;
951 stid->sc_stateid.si_opaque.so_id = new_id;
952 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
953 /* Will be incremented before return to client: */
954 refcount_set(&stid->sc_count, 1);
955 spin_lock_init(&stid->sc_lock);
956 INIT_LIST_HEAD(&stid->sc_cp_list);
957
958 /*
959 * It shouldn't be a problem to reuse an opaque stateid value.
960 * I don't think it is for 4.1. But with 4.0 I worry that, for
961 * example, a stray write retransmission could be accepted by
962 * the server when it should have been rejected. Therefore,
963 * adopt a trick from the sctp code to attempt to maximize the
964 * amount of time until an id is reused, by ensuring they always
965 * "increase" (mod INT_MAX):
966 */
967 return stid;
968 out_free:
969 kmem_cache_free(slab, stid);
970 return NULL;
971 }
972
973 /*
974 * Create a unique stateid_t to represent each COPY.
975 */
nfs4_init_cp_state(struct nfsd_net * nn,copy_stateid_t * stid,unsigned char cs_type)976 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
977 unsigned char cs_type)
978 {
979 int new_id;
980
981 stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
982 stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
983 stid->cs_type = cs_type;
984
985 idr_preload(GFP_KERNEL);
986 spin_lock(&nn->s2s_cp_lock);
987 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
988 stid->cs_stid.si_opaque.so_id = new_id;
989 stid->cs_stid.si_generation = 1;
990 spin_unlock(&nn->s2s_cp_lock);
991 idr_preload_end();
992 if (new_id < 0)
993 return 0;
994 return 1;
995 }
996
nfs4_init_copy_state(struct nfsd_net * nn,struct nfsd4_copy * copy)997 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
998 {
999 return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID);
1000 }
1001
nfs4_alloc_init_cpntf_state(struct nfsd_net * nn,struct nfs4_stid * p_stid)1002 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
1003 struct nfs4_stid *p_stid)
1004 {
1005 struct nfs4_cpntf_state *cps;
1006
1007 cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
1008 if (!cps)
1009 return NULL;
1010 cps->cpntf_time = ktime_get_boottime_seconds();
1011 refcount_set(&cps->cp_stateid.cs_count, 1);
1012 if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1013 goto out_free;
1014 spin_lock(&nn->s2s_cp_lock);
1015 list_add(&cps->cp_list, &p_stid->sc_cp_list);
1016 spin_unlock(&nn->s2s_cp_lock);
1017 return cps;
1018 out_free:
1019 kfree(cps);
1020 return NULL;
1021 }
1022
nfs4_free_copy_state(struct nfsd4_copy * copy)1023 void nfs4_free_copy_state(struct nfsd4_copy *copy)
1024 {
1025 struct nfsd_net *nn;
1026
1027 WARN_ON_ONCE(copy->cp_stateid.cs_type != NFS4_COPY_STID);
1028 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
1029 spin_lock(&nn->s2s_cp_lock);
1030 idr_remove(&nn->s2s_cp_stateids,
1031 copy->cp_stateid.cs_stid.si_opaque.so_id);
1032 spin_unlock(&nn->s2s_cp_lock);
1033 }
1034
nfs4_free_cpntf_statelist(struct net * net,struct nfs4_stid * stid)1035 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1036 {
1037 struct nfs4_cpntf_state *cps;
1038 struct nfsd_net *nn;
1039
1040 nn = net_generic(net, nfsd_net_id);
1041 spin_lock(&nn->s2s_cp_lock);
1042 while (!list_empty(&stid->sc_cp_list)) {
1043 cps = list_first_entry(&stid->sc_cp_list,
1044 struct nfs4_cpntf_state, cp_list);
1045 _free_cpntf_state_locked(nn, cps);
1046 }
1047 spin_unlock(&nn->s2s_cp_lock);
1048 }
1049
nfs4_alloc_open_stateid(struct nfs4_client * clp)1050 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1051 {
1052 struct nfs4_stid *stid;
1053
1054 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
1055 if (!stid)
1056 return NULL;
1057
1058 return openlockstateid(stid);
1059 }
1060
nfs4_free_deleg(struct nfs4_stid * stid)1061 static void nfs4_free_deleg(struct nfs4_stid *stid)
1062 {
1063 struct nfs4_delegation *dp = delegstateid(stid);
1064
1065 WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1066 WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1067 WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1068 WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1069 kmem_cache_free(deleg_slab, stid);
1070 atomic_long_dec(&num_delegations);
1071 }
1072
1073 /*
1074 * When we recall a delegation, we should be careful not to hand it
1075 * out again straight away.
1076 * To ensure this we keep a pair of bloom filters ('new' and 'old')
1077 * in which the filehandles of recalled delegations are "stored".
1078 * If a filehandle appear in either filter, a delegation is blocked.
1079 * When a delegation is recalled, the filehandle is stored in the "new"
1080 * filter.
1081 * Every 30 seconds we swap the filters and clear the "new" one,
1082 * unless both are empty of course.
1083 *
1084 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
1085 * low 3 bytes as hash-table indices.
1086 *
1087 * 'blocked_delegations_lock', which is always taken in block_delegations(),
1088 * is used to manage concurrent access. Testing does not need the lock
1089 * except when swapping the two filters.
1090 */
1091 static DEFINE_SPINLOCK(blocked_delegations_lock);
1092 static struct bloom_pair {
1093 int entries, old_entries;
1094 time64_t swap_time;
1095 int new; /* index into 'set' */
1096 DECLARE_BITMAP(set[2], 256);
1097 } blocked_delegations;
1098
delegation_blocked(struct knfsd_fh * fh)1099 static int delegation_blocked(struct knfsd_fh *fh)
1100 {
1101 u32 hash;
1102 struct bloom_pair *bd = &blocked_delegations;
1103
1104 if (bd->entries == 0)
1105 return 0;
1106 if (ktime_get_seconds() - bd->swap_time > 30) {
1107 spin_lock(&blocked_delegations_lock);
1108 if (ktime_get_seconds() - bd->swap_time > 30) {
1109 bd->entries -= bd->old_entries;
1110 bd->old_entries = bd->entries;
1111 memset(bd->set[bd->new], 0,
1112 sizeof(bd->set[0]));
1113 bd->new = 1-bd->new;
1114 bd->swap_time = ktime_get_seconds();
1115 }
1116 spin_unlock(&blocked_delegations_lock);
1117 }
1118 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1119 if (test_bit(hash&255, bd->set[0]) &&
1120 test_bit((hash>>8)&255, bd->set[0]) &&
1121 test_bit((hash>>16)&255, bd->set[0]))
1122 return 1;
1123
1124 if (test_bit(hash&255, bd->set[1]) &&
1125 test_bit((hash>>8)&255, bd->set[1]) &&
1126 test_bit((hash>>16)&255, bd->set[1]))
1127 return 1;
1128
1129 return 0;
1130 }
1131
block_delegations(struct knfsd_fh * fh)1132 static void block_delegations(struct knfsd_fh *fh)
1133 {
1134 u32 hash;
1135 struct bloom_pair *bd = &blocked_delegations;
1136
1137 hash = jhash(&fh->fh_raw, fh->fh_size, 0);
1138
1139 spin_lock(&blocked_delegations_lock);
1140 __set_bit(hash&255, bd->set[bd->new]);
1141 __set_bit((hash>>8)&255, bd->set[bd->new]);
1142 __set_bit((hash>>16)&255, bd->set[bd->new]);
1143 if (bd->entries == 0)
1144 bd->swap_time = ktime_get_seconds();
1145 bd->entries += 1;
1146 spin_unlock(&blocked_delegations_lock);
1147 }
1148
1149 static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client * clp,struct nfs4_file * fp,struct nfs4_clnt_odstate * odstate)1150 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1151 struct nfs4_clnt_odstate *odstate)
1152 {
1153 struct nfs4_delegation *dp;
1154 long n;
1155
1156 dprintk("NFSD alloc_init_deleg\n");
1157 n = atomic_long_inc_return(&num_delegations);
1158 if (n < 0 || n > max_delegations)
1159 goto out_dec;
1160 if (delegation_blocked(&fp->fi_fhandle))
1161 goto out_dec;
1162 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
1163 if (dp == NULL)
1164 goto out_dec;
1165
1166 /*
1167 * delegation seqid's are never incremented. The 4.1 special
1168 * meaning of seqid 0 isn't meaningful, really, but let's avoid
1169 * 0 anyway just for consistency and use 1:
1170 */
1171 dp->dl_stid.sc_stateid.si_generation = 1;
1172 INIT_LIST_HEAD(&dp->dl_perfile);
1173 INIT_LIST_HEAD(&dp->dl_perclnt);
1174 INIT_LIST_HEAD(&dp->dl_recall_lru);
1175 dp->dl_clnt_odstate = odstate;
1176 get_clnt_odstate(odstate);
1177 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
1178 dp->dl_retries = 1;
1179 dp->dl_recalled = false;
1180 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
1181 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
1182 get_nfs4_file(fp);
1183 dp->dl_stid.sc_file = fp;
1184 return dp;
1185 out_dec:
1186 atomic_long_dec(&num_delegations);
1187 return NULL;
1188 }
1189
1190 void
nfs4_put_stid(struct nfs4_stid * s)1191 nfs4_put_stid(struct nfs4_stid *s)
1192 {
1193 struct nfs4_file *fp = s->sc_file;
1194 struct nfs4_client *clp = s->sc_client;
1195
1196 might_lock(&clp->cl_lock);
1197
1198 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
1199 wake_up_all(&close_wq);
1200 return;
1201 }
1202 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1203 nfs4_free_cpntf_statelist(clp->net, s);
1204 spin_unlock(&clp->cl_lock);
1205 s->sc_free(s);
1206 if (fp)
1207 put_nfs4_file(fp);
1208 }
1209
1210 void
nfs4_inc_and_copy_stateid(stateid_t * dst,struct nfs4_stid * stid)1211 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1212 {
1213 stateid_t *src = &stid->sc_stateid;
1214
1215 spin_lock(&stid->sc_lock);
1216 if (unlikely(++src->si_generation == 0))
1217 src->si_generation = 1;
1218 memcpy(dst, src, sizeof(*dst));
1219 spin_unlock(&stid->sc_lock);
1220 }
1221
put_deleg_file(struct nfs4_file * fp)1222 static void put_deleg_file(struct nfs4_file *fp)
1223 {
1224 struct nfsd_file *nf = NULL;
1225
1226 spin_lock(&fp->fi_lock);
1227 if (--fp->fi_delegees == 0)
1228 swap(nf, fp->fi_deleg_file);
1229 spin_unlock(&fp->fi_lock);
1230
1231 if (nf)
1232 nfsd_file_put(nf);
1233 }
1234
nfs4_unlock_deleg_lease(struct nfs4_delegation * dp)1235 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1236 {
1237 struct nfs4_file *fp = dp->dl_stid.sc_file;
1238 struct nfsd_file *nf = fp->fi_deleg_file;
1239
1240 WARN_ON_ONCE(!fp->fi_delegees);
1241
1242 vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1243 put_deleg_file(fp);
1244 }
1245
destroy_unhashed_deleg(struct nfs4_delegation * dp)1246 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1247 {
1248 put_clnt_odstate(dp->dl_clnt_odstate);
1249 nfs4_unlock_deleg_lease(dp);
1250 nfs4_put_stid(&dp->dl_stid);
1251 }
1252
nfs4_unhash_stid(struct nfs4_stid * s)1253 void nfs4_unhash_stid(struct nfs4_stid *s)
1254 {
1255 s->sc_type = 0;
1256 }
1257
1258 /**
1259 * nfs4_delegation_exists - Discover if this delegation already exists
1260 * @clp: a pointer to the nfs4_client we're granting a delegation to
1261 * @fp: a pointer to the nfs4_file we're granting a delegation on
1262 *
1263 * Return:
1264 * On success: true iff an existing delegation is found
1265 */
1266
1267 static bool
nfs4_delegation_exists(struct nfs4_client * clp,struct nfs4_file * fp)1268 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1269 {
1270 struct nfs4_delegation *searchdp = NULL;
1271 struct nfs4_client *searchclp = NULL;
1272
1273 lockdep_assert_held(&state_lock);
1274 lockdep_assert_held(&fp->fi_lock);
1275
1276 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1277 searchclp = searchdp->dl_stid.sc_client;
1278 if (clp == searchclp) {
1279 return true;
1280 }
1281 }
1282 return false;
1283 }
1284
1285 /**
1286 * hash_delegation_locked - Add a delegation to the appropriate lists
1287 * @dp: a pointer to the nfs4_delegation we are adding.
1288 * @fp: a pointer to the nfs4_file we're granting a delegation on
1289 *
1290 * Return:
1291 * On success: NULL if the delegation was successfully hashed.
1292 *
1293 * On error: -EAGAIN if one was previously granted to this
1294 * nfs4_client for this nfs4_file. Delegation is not hashed.
1295 *
1296 */
1297
1298 static int
hash_delegation_locked(struct nfs4_delegation * dp,struct nfs4_file * fp)1299 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1300 {
1301 struct nfs4_client *clp = dp->dl_stid.sc_client;
1302
1303 lockdep_assert_held(&state_lock);
1304 lockdep_assert_held(&fp->fi_lock);
1305
1306 if (nfs4_delegation_exists(clp, fp))
1307 return -EAGAIN;
1308 refcount_inc(&dp->dl_stid.sc_count);
1309 dp->dl_stid.sc_type = NFS4_DELEG_STID;
1310 list_add(&dp->dl_perfile, &fp->fi_delegations);
1311 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1312 return 0;
1313 }
1314
delegation_hashed(struct nfs4_delegation * dp)1315 static bool delegation_hashed(struct nfs4_delegation *dp)
1316 {
1317 return !(list_empty(&dp->dl_perfile));
1318 }
1319
1320 static bool
unhash_delegation_locked(struct nfs4_delegation * dp)1321 unhash_delegation_locked(struct nfs4_delegation *dp)
1322 {
1323 struct nfs4_file *fp = dp->dl_stid.sc_file;
1324
1325 lockdep_assert_held(&state_lock);
1326
1327 if (!delegation_hashed(dp))
1328 return false;
1329
1330 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1331 /* Ensure that deleg break won't try to requeue it */
1332 ++dp->dl_time;
1333 spin_lock(&fp->fi_lock);
1334 list_del_init(&dp->dl_perclnt);
1335 list_del_init(&dp->dl_recall_lru);
1336 list_del_init(&dp->dl_perfile);
1337 spin_unlock(&fp->fi_lock);
1338 return true;
1339 }
1340
destroy_delegation(struct nfs4_delegation * dp)1341 static void destroy_delegation(struct nfs4_delegation *dp)
1342 {
1343 bool unhashed;
1344
1345 spin_lock(&state_lock);
1346 unhashed = unhash_delegation_locked(dp);
1347 spin_unlock(&state_lock);
1348 if (unhashed)
1349 destroy_unhashed_deleg(dp);
1350 }
1351
revoke_delegation(struct nfs4_delegation * dp)1352 static void revoke_delegation(struct nfs4_delegation *dp)
1353 {
1354 struct nfs4_client *clp = dp->dl_stid.sc_client;
1355
1356 WARN_ON(!list_empty(&dp->dl_recall_lru));
1357
1358 if (clp->cl_minorversion) {
1359 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1360 refcount_inc(&dp->dl_stid.sc_count);
1361 spin_lock(&clp->cl_lock);
1362 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1363 spin_unlock(&clp->cl_lock);
1364 }
1365 destroy_unhashed_deleg(dp);
1366 }
1367
1368 /*
1369 * SETCLIENTID state
1370 */
1371
clientid_hashval(u32 id)1372 static unsigned int clientid_hashval(u32 id)
1373 {
1374 return id & CLIENT_HASH_MASK;
1375 }
1376
clientstr_hashval(struct xdr_netobj name)1377 static unsigned int clientstr_hashval(struct xdr_netobj name)
1378 {
1379 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1380 }
1381
1382 /*
1383 * A stateid that had a deny mode associated with it is being released
1384 * or downgraded. Recalculate the deny mode on the file.
1385 */
1386 static void
recalculate_deny_mode(struct nfs4_file * fp)1387 recalculate_deny_mode(struct nfs4_file *fp)
1388 {
1389 struct nfs4_ol_stateid *stp;
1390
1391 spin_lock(&fp->fi_lock);
1392 fp->fi_share_deny = 0;
1393 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1394 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1395 spin_unlock(&fp->fi_lock);
1396 }
1397
1398 static void
reset_union_bmap_deny(u32 deny,struct nfs4_ol_stateid * stp)1399 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1400 {
1401 int i;
1402 bool change = false;
1403
1404 for (i = 1; i < 4; i++) {
1405 if ((i & deny) != i) {
1406 change = true;
1407 clear_deny(i, stp);
1408 }
1409 }
1410
1411 /* Recalculate per-file deny mode if there was a change */
1412 if (change)
1413 recalculate_deny_mode(stp->st_stid.sc_file);
1414 }
1415
1416 /* release all access and file references for a given stateid */
1417 static void
release_all_access(struct nfs4_ol_stateid * stp)1418 release_all_access(struct nfs4_ol_stateid *stp)
1419 {
1420 int i;
1421 struct nfs4_file *fp = stp->st_stid.sc_file;
1422
1423 if (fp && stp->st_deny_bmap != 0)
1424 recalculate_deny_mode(fp);
1425
1426 for (i = 1; i < 4; i++) {
1427 if (test_access(i, stp))
1428 nfs4_file_put_access(stp->st_stid.sc_file, i);
1429 clear_access(i, stp);
1430 }
1431 }
1432
nfs4_free_stateowner(struct nfs4_stateowner * sop)1433 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1434 {
1435 kfree(sop->so_owner.data);
1436 sop->so_ops->so_free(sop);
1437 }
1438
nfs4_put_stateowner(struct nfs4_stateowner * sop)1439 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1440 {
1441 struct nfs4_client *clp = sop->so_client;
1442
1443 might_lock(&clp->cl_lock);
1444
1445 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1446 return;
1447 sop->so_ops->so_unhash(sop);
1448 spin_unlock(&clp->cl_lock);
1449 nfs4_free_stateowner(sop);
1450 }
1451
1452 static bool
nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid * stp)1453 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1454 {
1455 return list_empty(&stp->st_perfile);
1456 }
1457
unhash_ol_stateid(struct nfs4_ol_stateid * stp)1458 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1459 {
1460 struct nfs4_file *fp = stp->st_stid.sc_file;
1461
1462 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1463
1464 if (list_empty(&stp->st_perfile))
1465 return false;
1466
1467 spin_lock(&fp->fi_lock);
1468 list_del_init(&stp->st_perfile);
1469 spin_unlock(&fp->fi_lock);
1470 list_del(&stp->st_perstateowner);
1471 return true;
1472 }
1473
nfs4_free_ol_stateid(struct nfs4_stid * stid)1474 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1475 {
1476 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1477
1478 put_clnt_odstate(stp->st_clnt_odstate);
1479 release_all_access(stp);
1480 if (stp->st_stateowner)
1481 nfs4_put_stateowner(stp->st_stateowner);
1482 WARN_ON(!list_empty(&stid->sc_cp_list));
1483 kmem_cache_free(stateid_slab, stid);
1484 }
1485
nfs4_free_lock_stateid(struct nfs4_stid * stid)1486 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1487 {
1488 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1489 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1490 struct nfsd_file *nf;
1491
1492 nf = find_any_file(stp->st_stid.sc_file);
1493 if (nf) {
1494 get_file(nf->nf_file);
1495 filp_close(nf->nf_file, (fl_owner_t)lo);
1496 nfsd_file_put(nf);
1497 }
1498 nfs4_free_ol_stateid(stid);
1499 }
1500
1501 /*
1502 * Put the persistent reference to an already unhashed generic stateid, while
1503 * holding the cl_lock. If it's the last reference, then put it onto the
1504 * reaplist for later destruction.
1505 */
put_ol_stateid_locked(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1506 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1507 struct list_head *reaplist)
1508 {
1509 struct nfs4_stid *s = &stp->st_stid;
1510 struct nfs4_client *clp = s->sc_client;
1511
1512 lockdep_assert_held(&clp->cl_lock);
1513
1514 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1515
1516 if (!refcount_dec_and_test(&s->sc_count)) {
1517 wake_up_all(&close_wq);
1518 return;
1519 }
1520
1521 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1522 list_add(&stp->st_locks, reaplist);
1523 }
1524
unhash_lock_stateid(struct nfs4_ol_stateid * stp)1525 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1526 {
1527 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1528
1529 if (!unhash_ol_stateid(stp))
1530 return false;
1531 list_del_init(&stp->st_locks);
1532 nfs4_unhash_stid(&stp->st_stid);
1533 return true;
1534 }
1535
release_lock_stateid(struct nfs4_ol_stateid * stp)1536 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1537 {
1538 struct nfs4_client *clp = stp->st_stid.sc_client;
1539 bool unhashed;
1540
1541 spin_lock(&clp->cl_lock);
1542 unhashed = unhash_lock_stateid(stp);
1543 spin_unlock(&clp->cl_lock);
1544 if (unhashed)
1545 nfs4_put_stid(&stp->st_stid);
1546 }
1547
unhash_lockowner_locked(struct nfs4_lockowner * lo)1548 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1549 {
1550 struct nfs4_client *clp = lo->lo_owner.so_client;
1551
1552 lockdep_assert_held(&clp->cl_lock);
1553
1554 list_del_init(&lo->lo_owner.so_strhash);
1555 }
1556
1557 /*
1558 * Free a list of generic stateids that were collected earlier after being
1559 * fully unhashed.
1560 */
1561 static void
free_ol_stateid_reaplist(struct list_head * reaplist)1562 free_ol_stateid_reaplist(struct list_head *reaplist)
1563 {
1564 struct nfs4_ol_stateid *stp;
1565 struct nfs4_file *fp;
1566
1567 might_sleep();
1568
1569 while (!list_empty(reaplist)) {
1570 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1571 st_locks);
1572 list_del(&stp->st_locks);
1573 fp = stp->st_stid.sc_file;
1574 stp->st_stid.sc_free(&stp->st_stid);
1575 if (fp)
1576 put_nfs4_file(fp);
1577 }
1578 }
1579
release_open_stateid_locks(struct nfs4_ol_stateid * open_stp,struct list_head * reaplist)1580 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1581 struct list_head *reaplist)
1582 {
1583 struct nfs4_ol_stateid *stp;
1584
1585 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1586
1587 while (!list_empty(&open_stp->st_locks)) {
1588 stp = list_entry(open_stp->st_locks.next,
1589 struct nfs4_ol_stateid, st_locks);
1590 WARN_ON(!unhash_lock_stateid(stp));
1591 put_ol_stateid_locked(stp, reaplist);
1592 }
1593 }
1594
unhash_open_stateid(struct nfs4_ol_stateid * stp,struct list_head * reaplist)1595 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1596 struct list_head *reaplist)
1597 {
1598 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1599
1600 if (!unhash_ol_stateid(stp))
1601 return false;
1602 release_open_stateid_locks(stp, reaplist);
1603 return true;
1604 }
1605
release_open_stateid(struct nfs4_ol_stateid * stp)1606 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1607 {
1608 LIST_HEAD(reaplist);
1609
1610 spin_lock(&stp->st_stid.sc_client->cl_lock);
1611 if (unhash_open_stateid(stp, &reaplist))
1612 put_ol_stateid_locked(stp, &reaplist);
1613 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1614 free_ol_stateid_reaplist(&reaplist);
1615 }
1616
unhash_openowner_locked(struct nfs4_openowner * oo)1617 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1618 {
1619 struct nfs4_client *clp = oo->oo_owner.so_client;
1620
1621 lockdep_assert_held(&clp->cl_lock);
1622
1623 list_del_init(&oo->oo_owner.so_strhash);
1624 list_del_init(&oo->oo_perclient);
1625 }
1626
release_last_closed_stateid(struct nfs4_openowner * oo)1627 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1628 {
1629 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1630 nfsd_net_id);
1631 struct nfs4_ol_stateid *s;
1632
1633 spin_lock(&nn->client_lock);
1634 s = oo->oo_last_closed_stid;
1635 if (s) {
1636 list_del_init(&oo->oo_close_lru);
1637 oo->oo_last_closed_stid = NULL;
1638 }
1639 spin_unlock(&nn->client_lock);
1640 if (s)
1641 nfs4_put_stid(&s->st_stid);
1642 }
1643
release_openowner(struct nfs4_openowner * oo)1644 static void release_openowner(struct nfs4_openowner *oo)
1645 {
1646 struct nfs4_ol_stateid *stp;
1647 struct nfs4_client *clp = oo->oo_owner.so_client;
1648 struct list_head reaplist;
1649
1650 INIT_LIST_HEAD(&reaplist);
1651
1652 spin_lock(&clp->cl_lock);
1653 unhash_openowner_locked(oo);
1654 while (!list_empty(&oo->oo_owner.so_stateids)) {
1655 stp = list_first_entry(&oo->oo_owner.so_stateids,
1656 struct nfs4_ol_stateid, st_perstateowner);
1657 if (unhash_open_stateid(stp, &reaplist))
1658 put_ol_stateid_locked(stp, &reaplist);
1659 }
1660 spin_unlock(&clp->cl_lock);
1661 free_ol_stateid_reaplist(&reaplist);
1662 release_last_closed_stateid(oo);
1663 nfs4_put_stateowner(&oo->oo_owner);
1664 }
1665
1666 static inline int
hash_sessionid(struct nfs4_sessionid * sessionid)1667 hash_sessionid(struct nfs4_sessionid *sessionid)
1668 {
1669 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1670
1671 return sid->sequence % SESSION_HASH_SIZE;
1672 }
1673
1674 #ifdef CONFIG_SUNRPC_DEBUG
1675 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1676 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1677 {
1678 u32 *ptr = (u32 *)(&sessionid->data[0]);
1679 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1680 }
1681 #else
1682 static inline void
dump_sessionid(const char * fn,struct nfs4_sessionid * sessionid)1683 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1684 {
1685 }
1686 #endif
1687
1688 /*
1689 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1690 * won't be used for replay.
1691 */
nfsd4_bump_seqid(struct nfsd4_compound_state * cstate,__be32 nfserr)1692 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1693 {
1694 struct nfs4_stateowner *so = cstate->replay_owner;
1695
1696 if (nfserr == nfserr_replay_me)
1697 return;
1698
1699 if (!seqid_mutating_err(ntohl(nfserr))) {
1700 nfsd4_cstate_clear_replay(cstate);
1701 return;
1702 }
1703 if (!so)
1704 return;
1705 if (so->so_is_open_owner)
1706 release_last_closed_stateid(openowner(so));
1707 so->so_seqid++;
1708 return;
1709 }
1710
1711 static void
gen_sessionid(struct nfsd4_session * ses)1712 gen_sessionid(struct nfsd4_session *ses)
1713 {
1714 struct nfs4_client *clp = ses->se_client;
1715 struct nfsd4_sessionid *sid;
1716
1717 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1718 sid->clientid = clp->cl_clientid;
1719 sid->sequence = current_sessionid++;
1720 sid->reserved = 0;
1721 }
1722
1723 /*
1724 * The protocol defines ca_maxresponssize_cached to include the size of
1725 * the rpc header, but all we need to cache is the data starting after
1726 * the end of the initial SEQUENCE operation--the rest we regenerate
1727 * each time. Therefore we can advertise a ca_maxresponssize_cached
1728 * value that is the number of bytes in our cache plus a few additional
1729 * bytes. In order to stay on the safe side, and not promise more than
1730 * we can cache, those additional bytes must be the minimum possible: 24
1731 * bytes of rpc header (xid through accept state, with AUTH_NULL
1732 * verifier), 12 for the compound header (with zero-length tag), and 44
1733 * for the SEQUENCE op response:
1734 */
1735 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1736
1737 static void
free_session_slots(struct nfsd4_session * ses)1738 free_session_slots(struct nfsd4_session *ses)
1739 {
1740 int i;
1741
1742 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1743 free_svc_cred(&ses->se_slots[i]->sl_cred);
1744 kfree(ses->se_slots[i]);
1745 }
1746 }
1747
1748 /*
1749 * We don't actually need to cache the rpc and session headers, so we
1750 * can allocate a little less for each slot:
1751 */
slot_bytes(struct nfsd4_channel_attrs * ca)1752 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1753 {
1754 u32 size;
1755
1756 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1757 size = 0;
1758 else
1759 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1760 return size + sizeof(struct nfsd4_slot);
1761 }
1762
1763 /*
1764 * XXX: If we run out of reserved DRC memory we could (up to a point)
1765 * re-negotiate active sessions and reduce their slot usage to make
1766 * room for new connections. For now we just fail the create session.
1767 */
nfsd4_get_drc_mem(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)1768 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1769 {
1770 u32 slotsize = slot_bytes(ca);
1771 u32 num = ca->maxreqs;
1772 unsigned long avail, total_avail;
1773 unsigned int scale_factor;
1774
1775 spin_lock(&nfsd_drc_lock);
1776 if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1777 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1778 else
1779 /* We have handed out more space than we chose in
1780 * set_max_drc() to allow. That isn't really a
1781 * problem as long as that doesn't make us think we
1782 * have lots more due to integer overflow.
1783 */
1784 total_avail = 0;
1785 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1786 /*
1787 * Never use more than a fraction of the remaining memory,
1788 * unless it's the only way to give this client a slot.
1789 * The chosen fraction is either 1/8 or 1/number of threads,
1790 * whichever is smaller. This ensures there are adequate
1791 * slots to support multiple clients per thread.
1792 * Give the client one slot even if that would require
1793 * over-allocation--it is better than failure.
1794 */
1795 scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1796
1797 avail = clamp_t(unsigned long, avail, slotsize,
1798 total_avail/scale_factor);
1799 num = min_t(int, num, avail / slotsize);
1800 num = max_t(int, num, 1);
1801 nfsd_drc_mem_used += num * slotsize;
1802 spin_unlock(&nfsd_drc_lock);
1803
1804 return num;
1805 }
1806
nfsd4_put_drc_mem(struct nfsd4_channel_attrs * ca)1807 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1808 {
1809 int slotsize = slot_bytes(ca);
1810
1811 spin_lock(&nfsd_drc_lock);
1812 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1813 spin_unlock(&nfsd_drc_lock);
1814 }
1815
alloc_session(struct nfsd4_channel_attrs * fattrs,struct nfsd4_channel_attrs * battrs)1816 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1817 struct nfsd4_channel_attrs *battrs)
1818 {
1819 int numslots = fattrs->maxreqs;
1820 int slotsize = slot_bytes(fattrs);
1821 struct nfsd4_session *new;
1822 int mem, i;
1823
1824 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1825 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1826 mem = numslots * sizeof(struct nfsd4_slot *);
1827
1828 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1829 if (!new)
1830 return NULL;
1831 /* allocate each struct nfsd4_slot and data cache in one piece */
1832 for (i = 0; i < numslots; i++) {
1833 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1834 if (!new->se_slots[i])
1835 goto out_free;
1836 }
1837
1838 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1839 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1840
1841 return new;
1842 out_free:
1843 while (i--)
1844 kfree(new->se_slots[i]);
1845 kfree(new);
1846 return NULL;
1847 }
1848
free_conn(struct nfsd4_conn * c)1849 static void free_conn(struct nfsd4_conn *c)
1850 {
1851 svc_xprt_put(c->cn_xprt);
1852 kfree(c);
1853 }
1854
nfsd4_conn_lost(struct svc_xpt_user * u)1855 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1856 {
1857 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1858 struct nfs4_client *clp = c->cn_session->se_client;
1859
1860 trace_nfsd_cb_lost(clp);
1861
1862 spin_lock(&clp->cl_lock);
1863 if (!list_empty(&c->cn_persession)) {
1864 list_del(&c->cn_persession);
1865 free_conn(c);
1866 }
1867 nfsd4_probe_callback(clp);
1868 spin_unlock(&clp->cl_lock);
1869 }
1870
alloc_conn(struct svc_rqst * rqstp,u32 flags)1871 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1872 {
1873 struct nfsd4_conn *conn;
1874
1875 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1876 if (!conn)
1877 return NULL;
1878 svc_xprt_get(rqstp->rq_xprt);
1879 conn->cn_xprt = rqstp->rq_xprt;
1880 conn->cn_flags = flags;
1881 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1882 return conn;
1883 }
1884
__nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)1885 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1886 {
1887 conn->cn_session = ses;
1888 list_add(&conn->cn_persession, &ses->se_conns);
1889 }
1890
nfsd4_hash_conn(struct nfsd4_conn * conn,struct nfsd4_session * ses)1891 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1892 {
1893 struct nfs4_client *clp = ses->se_client;
1894
1895 spin_lock(&clp->cl_lock);
1896 __nfsd4_hash_conn(conn, ses);
1897 spin_unlock(&clp->cl_lock);
1898 }
1899
nfsd4_register_conn(struct nfsd4_conn * conn)1900 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1901 {
1902 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1903 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1904 }
1905
nfsd4_init_conn(struct svc_rqst * rqstp,struct nfsd4_conn * conn,struct nfsd4_session * ses)1906 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1907 {
1908 int ret;
1909
1910 nfsd4_hash_conn(conn, ses);
1911 ret = nfsd4_register_conn(conn);
1912 if (ret)
1913 /* oops; xprt is already down: */
1914 nfsd4_conn_lost(&conn->cn_xpt_user);
1915 /* We may have gained or lost a callback channel: */
1916 nfsd4_probe_callback_sync(ses->se_client);
1917 }
1918
alloc_conn_from_crses(struct svc_rqst * rqstp,struct nfsd4_create_session * cses)1919 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1920 {
1921 u32 dir = NFS4_CDFC4_FORE;
1922
1923 if (cses->flags & SESSION4_BACK_CHAN)
1924 dir |= NFS4_CDFC4_BACK;
1925 return alloc_conn(rqstp, dir);
1926 }
1927
1928 /* must be called under client_lock */
nfsd4_del_conns(struct nfsd4_session * s)1929 static void nfsd4_del_conns(struct nfsd4_session *s)
1930 {
1931 struct nfs4_client *clp = s->se_client;
1932 struct nfsd4_conn *c;
1933
1934 spin_lock(&clp->cl_lock);
1935 while (!list_empty(&s->se_conns)) {
1936 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1937 list_del_init(&c->cn_persession);
1938 spin_unlock(&clp->cl_lock);
1939
1940 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1941 free_conn(c);
1942
1943 spin_lock(&clp->cl_lock);
1944 }
1945 spin_unlock(&clp->cl_lock);
1946 }
1947
__free_session(struct nfsd4_session * ses)1948 static void __free_session(struct nfsd4_session *ses)
1949 {
1950 free_session_slots(ses);
1951 kfree(ses);
1952 }
1953
free_session(struct nfsd4_session * ses)1954 static void free_session(struct nfsd4_session *ses)
1955 {
1956 nfsd4_del_conns(ses);
1957 nfsd4_put_drc_mem(&ses->se_fchannel);
1958 __free_session(ses);
1959 }
1960
init_session(struct svc_rqst * rqstp,struct nfsd4_session * new,struct nfs4_client * clp,struct nfsd4_create_session * cses)1961 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1962 {
1963 int idx;
1964 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1965
1966 new->se_client = clp;
1967 gen_sessionid(new);
1968
1969 INIT_LIST_HEAD(&new->se_conns);
1970
1971 new->se_cb_seq_nr = 1;
1972 new->se_flags = cses->flags;
1973 new->se_cb_prog = cses->callback_prog;
1974 new->se_cb_sec = cses->cb_sec;
1975 atomic_set(&new->se_ref, 0);
1976 idx = hash_sessionid(&new->se_sessionid);
1977 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1978 spin_lock(&clp->cl_lock);
1979 list_add(&new->se_perclnt, &clp->cl_sessions);
1980 spin_unlock(&clp->cl_lock);
1981
1982 {
1983 struct sockaddr *sa = svc_addr(rqstp);
1984 /*
1985 * This is a little silly; with sessions there's no real
1986 * use for the callback address. Use the peer address
1987 * as a reasonable default for now, but consider fixing
1988 * the rpc client not to require an address in the
1989 * future:
1990 */
1991 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1992 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1993 }
1994 }
1995
1996 /* caller must hold client_lock */
1997 static struct nfsd4_session *
__find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net)1998 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1999 {
2000 struct nfsd4_session *elem;
2001 int idx;
2002 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2003
2004 lockdep_assert_held(&nn->client_lock);
2005
2006 dump_sessionid(__func__, sessionid);
2007 idx = hash_sessionid(sessionid);
2008 /* Search in the appropriate list */
2009 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2010 if (!memcmp(elem->se_sessionid.data, sessionid->data,
2011 NFS4_MAX_SESSIONID_LEN)) {
2012 return elem;
2013 }
2014 }
2015
2016 dprintk("%s: session not found\n", __func__);
2017 return NULL;
2018 }
2019
2020 static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid * sessionid,struct net * net,__be32 * ret)2021 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2022 __be32 *ret)
2023 {
2024 struct nfsd4_session *session;
2025 __be32 status = nfserr_badsession;
2026
2027 session = __find_in_sessionid_hashtbl(sessionid, net);
2028 if (!session)
2029 goto out;
2030 status = nfsd4_get_session_locked(session);
2031 if (status)
2032 session = NULL;
2033 out:
2034 *ret = status;
2035 return session;
2036 }
2037
2038 /* caller must hold client_lock */
2039 static void
unhash_session(struct nfsd4_session * ses)2040 unhash_session(struct nfsd4_session *ses)
2041 {
2042 struct nfs4_client *clp = ses->se_client;
2043 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2044
2045 lockdep_assert_held(&nn->client_lock);
2046
2047 list_del(&ses->se_hash);
2048 spin_lock(&ses->se_client->cl_lock);
2049 list_del(&ses->se_perclnt);
2050 spin_unlock(&ses->se_client->cl_lock);
2051 }
2052
2053 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2054 static int
STALE_CLIENTID(clientid_t * clid,struct nfsd_net * nn)2055 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2056 {
2057 /*
2058 * We're assuming the clid was not given out from a boot
2059 * precisely 2^32 (about 136 years) before this one. That seems
2060 * a safe assumption:
2061 */
2062 if (clid->cl_boot == (u32)nn->boot_time)
2063 return 0;
2064 trace_nfsd_clid_stale(clid);
2065 return 1;
2066 }
2067
2068 /*
2069 * XXX Should we use a slab cache ?
2070 * This type of memory management is somewhat inefficient, but we use it
2071 * anyway since SETCLIENTID is not a common operation.
2072 */
alloc_client(struct xdr_netobj name,struct nfsd_net * nn)2073 static struct nfs4_client *alloc_client(struct xdr_netobj name,
2074 struct nfsd_net *nn)
2075 {
2076 struct nfs4_client *clp;
2077 int i;
2078
2079 if (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) {
2080 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
2081 return NULL;
2082 }
2083 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
2084 if (clp == NULL)
2085 return NULL;
2086 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
2087 if (clp->cl_name.data == NULL)
2088 goto err_no_name;
2089 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2090 sizeof(struct list_head),
2091 GFP_KERNEL);
2092 if (!clp->cl_ownerstr_hashtbl)
2093 goto err_no_hashtbl;
2094 for (i = 0; i < OWNER_HASH_SIZE; i++)
2095 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
2096 INIT_LIST_HEAD(&clp->cl_sessions);
2097 idr_init(&clp->cl_stateids);
2098 atomic_set(&clp->cl_rpc_users, 0);
2099 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2100 clp->cl_state = NFSD4_ACTIVE;
2101 atomic_inc(&nn->nfs4_client_count);
2102 atomic_set(&clp->cl_delegs_in_recall, 0);
2103 INIT_LIST_HEAD(&clp->cl_idhash);
2104 INIT_LIST_HEAD(&clp->cl_openowners);
2105 INIT_LIST_HEAD(&clp->cl_delegations);
2106 INIT_LIST_HEAD(&clp->cl_lru);
2107 INIT_LIST_HEAD(&clp->cl_revoked);
2108 #ifdef CONFIG_NFSD_PNFS
2109 INIT_LIST_HEAD(&clp->cl_lo_states);
2110 #endif
2111 INIT_LIST_HEAD(&clp->async_copies);
2112 spin_lock_init(&clp->async_lock);
2113 spin_lock_init(&clp->cl_lock);
2114 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2115 return clp;
2116 err_no_hashtbl:
2117 kfree(clp->cl_name.data);
2118 err_no_name:
2119 kmem_cache_free(client_slab, clp);
2120 return NULL;
2121 }
2122
__free_client(struct kref * k)2123 static void __free_client(struct kref *k)
2124 {
2125 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2126 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2127
2128 free_svc_cred(&clp->cl_cred);
2129 kfree(clp->cl_ownerstr_hashtbl);
2130 kfree(clp->cl_name.data);
2131 kfree(clp->cl_nii_domain.data);
2132 kfree(clp->cl_nii_name.data);
2133 idr_destroy(&clp->cl_stateids);
2134 kmem_cache_free(client_slab, clp);
2135 }
2136
drop_client(struct nfs4_client * clp)2137 static void drop_client(struct nfs4_client *clp)
2138 {
2139 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
2140 }
2141
2142 static void
free_client(struct nfs4_client * clp)2143 free_client(struct nfs4_client *clp)
2144 {
2145 while (!list_empty(&clp->cl_sessions)) {
2146 struct nfsd4_session *ses;
2147 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2148 se_perclnt);
2149 list_del(&ses->se_perclnt);
2150 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2151 free_session(ses);
2152 }
2153 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2154 if (clp->cl_nfsd_dentry) {
2155 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2156 clp->cl_nfsd_dentry = NULL;
2157 wake_up_all(&expiry_wq);
2158 }
2159 drop_client(clp);
2160 }
2161
2162 /* must be called under the client_lock */
2163 static void
unhash_client_locked(struct nfs4_client * clp)2164 unhash_client_locked(struct nfs4_client *clp)
2165 {
2166 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2167 struct nfsd4_session *ses;
2168
2169 lockdep_assert_held(&nn->client_lock);
2170
2171 /* Mark the client as expired! */
2172 clp->cl_time = 0;
2173 /* Make it invisible */
2174 if (!list_empty(&clp->cl_idhash)) {
2175 list_del_init(&clp->cl_idhash);
2176 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2177 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2178 else
2179 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2180 }
2181 list_del_init(&clp->cl_lru);
2182 spin_lock(&clp->cl_lock);
2183 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2184 list_del_init(&ses->se_hash);
2185 spin_unlock(&clp->cl_lock);
2186 }
2187
2188 static void
unhash_client(struct nfs4_client * clp)2189 unhash_client(struct nfs4_client *clp)
2190 {
2191 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2192
2193 spin_lock(&nn->client_lock);
2194 unhash_client_locked(clp);
2195 spin_unlock(&nn->client_lock);
2196 }
2197
mark_client_expired_locked(struct nfs4_client * clp)2198 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2199 {
2200 if (atomic_read(&clp->cl_rpc_users))
2201 return nfserr_jukebox;
2202 unhash_client_locked(clp);
2203 return nfs_ok;
2204 }
2205
2206 static void
__destroy_client(struct nfs4_client * clp)2207 __destroy_client(struct nfs4_client *clp)
2208 {
2209 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2210 int i;
2211 struct nfs4_openowner *oo;
2212 struct nfs4_delegation *dp;
2213 struct list_head reaplist;
2214
2215 INIT_LIST_HEAD(&reaplist);
2216 spin_lock(&state_lock);
2217 while (!list_empty(&clp->cl_delegations)) {
2218 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2219 WARN_ON(!unhash_delegation_locked(dp));
2220 list_add(&dp->dl_recall_lru, &reaplist);
2221 }
2222 spin_unlock(&state_lock);
2223 while (!list_empty(&reaplist)) {
2224 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2225 list_del_init(&dp->dl_recall_lru);
2226 destroy_unhashed_deleg(dp);
2227 }
2228 while (!list_empty(&clp->cl_revoked)) {
2229 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2230 list_del_init(&dp->dl_recall_lru);
2231 nfs4_put_stid(&dp->dl_stid);
2232 }
2233 while (!list_empty(&clp->cl_openowners)) {
2234 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2235 nfs4_get_stateowner(&oo->oo_owner);
2236 release_openowner(oo);
2237 }
2238 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2239 struct nfs4_stateowner *so, *tmp;
2240
2241 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2242 so_strhash) {
2243 /* Should be no openowners at this point */
2244 WARN_ON_ONCE(so->so_is_open_owner);
2245 remove_blocked_locks(lockowner(so));
2246 }
2247 }
2248 nfsd4_return_all_client_layouts(clp);
2249 nfsd4_shutdown_copy(clp);
2250 nfsd4_shutdown_callback(clp);
2251 if (clp->cl_cb_conn.cb_xprt)
2252 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2253 atomic_add_unless(&nn->nfs4_client_count, -1, 0);
2254 nfsd4_dec_courtesy_client_count(nn, clp);
2255 free_client(clp);
2256 wake_up_all(&expiry_wq);
2257 }
2258
2259 static void
destroy_client(struct nfs4_client * clp)2260 destroy_client(struct nfs4_client *clp)
2261 {
2262 unhash_client(clp);
2263 __destroy_client(clp);
2264 }
2265
inc_reclaim_complete(struct nfs4_client * clp)2266 static void inc_reclaim_complete(struct nfs4_client *clp)
2267 {
2268 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2269
2270 if (!nn->track_reclaim_completes)
2271 return;
2272 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2273 return;
2274 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2275 nn->reclaim_str_hashtbl_size) {
2276 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2277 clp->net->ns.inum);
2278 nfsd4_end_grace(nn);
2279 }
2280 }
2281
expire_client(struct nfs4_client * clp)2282 static void expire_client(struct nfs4_client *clp)
2283 {
2284 unhash_client(clp);
2285 nfsd4_client_record_remove(clp);
2286 __destroy_client(clp);
2287 }
2288
copy_verf(struct nfs4_client * target,nfs4_verifier * source)2289 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2290 {
2291 memcpy(target->cl_verifier.data, source->data,
2292 sizeof(target->cl_verifier.data));
2293 }
2294
copy_clid(struct nfs4_client * target,struct nfs4_client * source)2295 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2296 {
2297 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2298 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2299 }
2300
copy_cred(struct svc_cred * target,struct svc_cred * source)2301 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2302 {
2303 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2304 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2305 GFP_KERNEL);
2306 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2307 if ((source->cr_principal && !target->cr_principal) ||
2308 (source->cr_raw_principal && !target->cr_raw_principal) ||
2309 (source->cr_targ_princ && !target->cr_targ_princ))
2310 return -ENOMEM;
2311
2312 target->cr_flavor = source->cr_flavor;
2313 target->cr_uid = source->cr_uid;
2314 target->cr_gid = source->cr_gid;
2315 target->cr_group_info = source->cr_group_info;
2316 get_group_info(target->cr_group_info);
2317 target->cr_gss_mech = source->cr_gss_mech;
2318 if (source->cr_gss_mech)
2319 gss_mech_get(source->cr_gss_mech);
2320 return 0;
2321 }
2322
2323 static int
compare_blob(const struct xdr_netobj * o1,const struct xdr_netobj * o2)2324 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2325 {
2326 if (o1->len < o2->len)
2327 return -1;
2328 if (o1->len > o2->len)
2329 return 1;
2330 return memcmp(o1->data, o2->data, o1->len);
2331 }
2332
2333 static int
same_verf(nfs4_verifier * v1,nfs4_verifier * v2)2334 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2335 {
2336 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2337 }
2338
2339 static int
same_clid(clientid_t * cl1,clientid_t * cl2)2340 same_clid(clientid_t *cl1, clientid_t *cl2)
2341 {
2342 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2343 }
2344
groups_equal(struct group_info * g1,struct group_info * g2)2345 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2346 {
2347 int i;
2348
2349 if (g1->ngroups != g2->ngroups)
2350 return false;
2351 for (i=0; i<g1->ngroups; i++)
2352 if (!gid_eq(g1->gid[i], g2->gid[i]))
2353 return false;
2354 return true;
2355 }
2356
2357 /*
2358 * RFC 3530 language requires clid_inuse be returned when the
2359 * "principal" associated with a requests differs from that previously
2360 * used. We use uid, gid's, and gss principal string as our best
2361 * approximation. We also don't want to allow non-gss use of a client
2362 * established using gss: in theory cr_principal should catch that
2363 * change, but in practice cr_principal can be null even in the gss case
2364 * since gssd doesn't always pass down a principal string.
2365 */
is_gss_cred(struct svc_cred * cr)2366 static bool is_gss_cred(struct svc_cred *cr)
2367 {
2368 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2369 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2370 }
2371
2372
2373 static bool
same_creds(struct svc_cred * cr1,struct svc_cred * cr2)2374 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2375 {
2376 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2377 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2378 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2379 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2380 return false;
2381 /* XXX: check that cr_targ_princ fields match ? */
2382 if (cr1->cr_principal == cr2->cr_principal)
2383 return true;
2384 if (!cr1->cr_principal || !cr2->cr_principal)
2385 return false;
2386 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2387 }
2388
svc_rqst_integrity_protected(struct svc_rqst * rqstp)2389 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2390 {
2391 struct svc_cred *cr = &rqstp->rq_cred;
2392 u32 service;
2393
2394 if (!cr->cr_gss_mech)
2395 return false;
2396 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2397 return service == RPC_GSS_SVC_INTEGRITY ||
2398 service == RPC_GSS_SVC_PRIVACY;
2399 }
2400
nfsd4_mach_creds_match(struct nfs4_client * cl,struct svc_rqst * rqstp)2401 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2402 {
2403 struct svc_cred *cr = &rqstp->rq_cred;
2404
2405 if (!cl->cl_mach_cred)
2406 return true;
2407 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2408 return false;
2409 if (!svc_rqst_integrity_protected(rqstp))
2410 return false;
2411 if (cl->cl_cred.cr_raw_principal)
2412 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2413 cr->cr_raw_principal);
2414 if (!cr->cr_principal)
2415 return false;
2416 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2417 }
2418
gen_confirm(struct nfs4_client * clp,struct nfsd_net * nn)2419 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2420 {
2421 __be32 verf[2];
2422
2423 /*
2424 * This is opaque to client, so no need to byte-swap. Use
2425 * __force to keep sparse happy
2426 */
2427 verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2428 verf[1] = (__force __be32)nn->clverifier_counter++;
2429 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2430 }
2431
gen_clid(struct nfs4_client * clp,struct nfsd_net * nn)2432 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2433 {
2434 clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2435 clp->cl_clientid.cl_id = nn->clientid_counter++;
2436 gen_confirm(clp, nn);
2437 }
2438
2439 static struct nfs4_stid *
find_stateid_locked(struct nfs4_client * cl,stateid_t * t)2440 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2441 {
2442 struct nfs4_stid *ret;
2443
2444 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2445 if (!ret || !ret->sc_type)
2446 return NULL;
2447 return ret;
2448 }
2449
2450 static struct nfs4_stid *
find_stateid_by_type(struct nfs4_client * cl,stateid_t * t,char typemask)2451 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2452 {
2453 struct nfs4_stid *s;
2454
2455 spin_lock(&cl->cl_lock);
2456 s = find_stateid_locked(cl, t);
2457 if (s != NULL) {
2458 if (typemask & s->sc_type)
2459 refcount_inc(&s->sc_count);
2460 else
2461 s = NULL;
2462 }
2463 spin_unlock(&cl->cl_lock);
2464 return s;
2465 }
2466
get_nfsdfs_clp(struct inode * inode)2467 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2468 {
2469 struct nfsdfs_client *nc;
2470 nc = get_nfsdfs_client(inode);
2471 if (!nc)
2472 return NULL;
2473 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2474 }
2475
seq_quote_mem(struct seq_file * m,char * data,int len)2476 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2477 {
2478 seq_printf(m, "\"");
2479 seq_escape_mem(m, data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, "\"\\");
2480 seq_printf(m, "\"");
2481 }
2482
cb_state2str(int state)2483 static const char *cb_state2str(int state)
2484 {
2485 switch (state) {
2486 case NFSD4_CB_UP:
2487 return "UP";
2488 case NFSD4_CB_UNKNOWN:
2489 return "UNKNOWN";
2490 case NFSD4_CB_DOWN:
2491 return "DOWN";
2492 case NFSD4_CB_FAULT:
2493 return "FAULT";
2494 }
2495 return "UNDEFINED";
2496 }
2497
client_info_show(struct seq_file * m,void * v)2498 static int client_info_show(struct seq_file *m, void *v)
2499 {
2500 struct inode *inode = file_inode(m->file);
2501 struct nfs4_client *clp;
2502 u64 clid;
2503
2504 clp = get_nfsdfs_clp(inode);
2505 if (!clp)
2506 return -ENXIO;
2507 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2508 seq_printf(m, "clientid: 0x%llx\n", clid);
2509 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2510
2511 if (clp->cl_state == NFSD4_COURTESY)
2512 seq_puts(m, "status: courtesy\n");
2513 else if (clp->cl_state == NFSD4_EXPIRABLE)
2514 seq_puts(m, "status: expirable\n");
2515 else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2516 seq_puts(m, "status: confirmed\n");
2517 else
2518 seq_puts(m, "status: unconfirmed\n");
2519 seq_printf(m, "seconds from last renew: %lld\n",
2520 ktime_get_boottime_seconds() - clp->cl_time);
2521 seq_printf(m, "name: ");
2522 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2523 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2524 if (clp->cl_nii_domain.data) {
2525 seq_printf(m, "Implementation domain: ");
2526 seq_quote_mem(m, clp->cl_nii_domain.data,
2527 clp->cl_nii_domain.len);
2528 seq_printf(m, "\nImplementation name: ");
2529 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2530 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2531 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2532 }
2533 seq_printf(m, "callback state: %s\n", cb_state2str(clp->cl_cb_state));
2534 seq_printf(m, "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
2535 drop_client(clp);
2536
2537 return 0;
2538 }
2539
2540 DEFINE_SHOW_ATTRIBUTE(client_info);
2541
states_start(struct seq_file * s,loff_t * pos)2542 static void *states_start(struct seq_file *s, loff_t *pos)
2543 __acquires(&clp->cl_lock)
2544 {
2545 struct nfs4_client *clp = s->private;
2546 unsigned long id = *pos;
2547 void *ret;
2548
2549 spin_lock(&clp->cl_lock);
2550 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2551 *pos = id;
2552 return ret;
2553 }
2554
states_next(struct seq_file * s,void * v,loff_t * pos)2555 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2556 {
2557 struct nfs4_client *clp = s->private;
2558 unsigned long id = *pos;
2559 void *ret;
2560
2561 id = *pos;
2562 id++;
2563 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2564 *pos = id;
2565 return ret;
2566 }
2567
states_stop(struct seq_file * s,void * v)2568 static void states_stop(struct seq_file *s, void *v)
2569 __releases(&clp->cl_lock)
2570 {
2571 struct nfs4_client *clp = s->private;
2572
2573 spin_unlock(&clp->cl_lock);
2574 }
2575
nfs4_show_fname(struct seq_file * s,struct nfsd_file * f)2576 static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2577 {
2578 seq_printf(s, "filename: \"%pD2\"", f->nf_file);
2579 }
2580
nfs4_show_superblock(struct seq_file * s,struct nfsd_file * f)2581 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2582 {
2583 struct inode *inode = file_inode(f->nf_file);
2584
2585 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2586 MAJOR(inode->i_sb->s_dev),
2587 MINOR(inode->i_sb->s_dev),
2588 inode->i_ino);
2589 }
2590
nfs4_show_owner(struct seq_file * s,struct nfs4_stateowner * oo)2591 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2592 {
2593 seq_printf(s, "owner: ");
2594 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2595 }
2596
nfs4_show_stateid(struct seq_file * s,stateid_t * stid)2597 static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2598 {
2599 seq_printf(s, "0x%.8x", stid->si_generation);
2600 seq_printf(s, "%12phN", &stid->si_opaque);
2601 }
2602
nfs4_show_open(struct seq_file * s,struct nfs4_stid * st)2603 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2604 {
2605 struct nfs4_ol_stateid *ols;
2606 struct nfs4_file *nf;
2607 struct nfsd_file *file;
2608 struct nfs4_stateowner *oo;
2609 unsigned int access, deny;
2610
2611 if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2612 return 0; /* XXX: or SEQ_SKIP? */
2613 ols = openlockstateid(st);
2614 oo = ols->st_stateowner;
2615 nf = st->sc_file;
2616 file = find_any_file(nf);
2617 if (!file)
2618 return 0;
2619
2620 seq_printf(s, "- ");
2621 nfs4_show_stateid(s, &st->sc_stateid);
2622 seq_printf(s, ": { type: open, ");
2623
2624 access = bmap_to_share_mode(ols->st_access_bmap);
2625 deny = bmap_to_share_mode(ols->st_deny_bmap);
2626
2627 seq_printf(s, "access: %s%s, ",
2628 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2629 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2630 seq_printf(s, "deny: %s%s, ",
2631 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2632 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2633
2634 nfs4_show_superblock(s, file);
2635 seq_printf(s, ", ");
2636 nfs4_show_fname(s, file);
2637 seq_printf(s, ", ");
2638 nfs4_show_owner(s, oo);
2639 seq_printf(s, " }\n");
2640 nfsd_file_put(file);
2641
2642 return 0;
2643 }
2644
nfs4_show_lock(struct seq_file * s,struct nfs4_stid * st)2645 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2646 {
2647 struct nfs4_ol_stateid *ols;
2648 struct nfs4_file *nf;
2649 struct nfsd_file *file;
2650 struct nfs4_stateowner *oo;
2651
2652 ols = openlockstateid(st);
2653 oo = ols->st_stateowner;
2654 nf = st->sc_file;
2655 file = find_any_file(nf);
2656 if (!file)
2657 return 0;
2658
2659 seq_printf(s, "- ");
2660 nfs4_show_stateid(s, &st->sc_stateid);
2661 seq_printf(s, ": { type: lock, ");
2662
2663 /*
2664 * Note: a lock stateid isn't really the same thing as a lock,
2665 * it's the locking state held by one owner on a file, and there
2666 * may be multiple (or no) lock ranges associated with it.
2667 * (Same for the matter is true of open stateids.)
2668 */
2669
2670 nfs4_show_superblock(s, file);
2671 /* XXX: open stateid? */
2672 seq_printf(s, ", ");
2673 nfs4_show_fname(s, file);
2674 seq_printf(s, ", ");
2675 nfs4_show_owner(s, oo);
2676 seq_printf(s, " }\n");
2677 nfsd_file_put(file);
2678
2679 return 0;
2680 }
2681
nfs4_show_deleg(struct seq_file * s,struct nfs4_stid * st)2682 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2683 {
2684 struct nfs4_delegation *ds;
2685 struct nfs4_file *nf;
2686 struct nfsd_file *file;
2687
2688 ds = delegstateid(st);
2689 nf = st->sc_file;
2690 file = find_deleg_file(nf);
2691 if (!file)
2692 return 0;
2693
2694 seq_printf(s, "- ");
2695 nfs4_show_stateid(s, &st->sc_stateid);
2696 seq_printf(s, ": { type: deleg, ");
2697
2698 /* Kinda dead code as long as we only support read delegs: */
2699 seq_printf(s, "access: %s, ",
2700 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2701
2702 /* XXX: lease time, whether it's being recalled. */
2703
2704 nfs4_show_superblock(s, file);
2705 seq_printf(s, ", ");
2706 nfs4_show_fname(s, file);
2707 seq_printf(s, " }\n");
2708 nfsd_file_put(file);
2709
2710 return 0;
2711 }
2712
nfs4_show_layout(struct seq_file * s,struct nfs4_stid * st)2713 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2714 {
2715 struct nfs4_layout_stateid *ls;
2716 struct nfsd_file *file;
2717
2718 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2719 file = ls->ls_file;
2720
2721 seq_printf(s, "- ");
2722 nfs4_show_stateid(s, &st->sc_stateid);
2723 seq_printf(s, ": { type: layout, ");
2724
2725 /* XXX: What else would be useful? */
2726
2727 nfs4_show_superblock(s, file);
2728 seq_printf(s, ", ");
2729 nfs4_show_fname(s, file);
2730 seq_printf(s, " }\n");
2731
2732 return 0;
2733 }
2734
states_show(struct seq_file * s,void * v)2735 static int states_show(struct seq_file *s, void *v)
2736 {
2737 struct nfs4_stid *st = v;
2738
2739 switch (st->sc_type) {
2740 case NFS4_OPEN_STID:
2741 return nfs4_show_open(s, st);
2742 case NFS4_LOCK_STID:
2743 return nfs4_show_lock(s, st);
2744 case NFS4_DELEG_STID:
2745 return nfs4_show_deleg(s, st);
2746 case NFS4_LAYOUT_STID:
2747 return nfs4_show_layout(s, st);
2748 default:
2749 return 0; /* XXX: or SEQ_SKIP? */
2750 }
2751 /* XXX: copy stateids? */
2752 }
2753
2754 static struct seq_operations states_seq_ops = {
2755 .start = states_start,
2756 .next = states_next,
2757 .stop = states_stop,
2758 .show = states_show
2759 };
2760
client_states_open(struct inode * inode,struct file * file)2761 static int client_states_open(struct inode *inode, struct file *file)
2762 {
2763 struct seq_file *s;
2764 struct nfs4_client *clp;
2765 int ret;
2766
2767 clp = get_nfsdfs_clp(inode);
2768 if (!clp)
2769 return -ENXIO;
2770
2771 ret = seq_open(file, &states_seq_ops);
2772 if (ret)
2773 return ret;
2774 s = file->private_data;
2775 s->private = clp;
2776 return 0;
2777 }
2778
client_opens_release(struct inode * inode,struct file * file)2779 static int client_opens_release(struct inode *inode, struct file *file)
2780 {
2781 struct seq_file *m = file->private_data;
2782 struct nfs4_client *clp = m->private;
2783
2784 /* XXX: alternatively, we could get/drop in seq start/stop */
2785 drop_client(clp);
2786 return 0;
2787 }
2788
2789 static const struct file_operations client_states_fops = {
2790 .open = client_states_open,
2791 .read = seq_read,
2792 .llseek = seq_lseek,
2793 .release = client_opens_release,
2794 };
2795
2796 /*
2797 * Normally we refuse to destroy clients that are in use, but here the
2798 * administrator is telling us to just do it. We also want to wait
2799 * so the caller has a guarantee that the client's locks are gone by
2800 * the time the write returns:
2801 */
force_expire_client(struct nfs4_client * clp)2802 static void force_expire_client(struct nfs4_client *clp)
2803 {
2804 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2805 bool already_expired;
2806
2807 trace_nfsd_clid_admin_expired(&clp->cl_clientid);
2808
2809 spin_lock(&nn->client_lock);
2810 clp->cl_time = 0;
2811 spin_unlock(&nn->client_lock);
2812
2813 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2814 spin_lock(&nn->client_lock);
2815 already_expired = list_empty(&clp->cl_lru);
2816 if (!already_expired)
2817 unhash_client_locked(clp);
2818 spin_unlock(&nn->client_lock);
2819
2820 if (!already_expired)
2821 expire_client(clp);
2822 else
2823 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2824 }
2825
client_ctl_write(struct file * file,const char __user * buf,size_t size,loff_t * pos)2826 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2827 size_t size, loff_t *pos)
2828 {
2829 char *data;
2830 struct nfs4_client *clp;
2831
2832 data = simple_transaction_get(file, buf, size);
2833 if (IS_ERR(data))
2834 return PTR_ERR(data);
2835 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
2836 return -EINVAL;
2837 clp = get_nfsdfs_clp(file_inode(file));
2838 if (!clp)
2839 return -ENXIO;
2840 force_expire_client(clp);
2841 drop_client(clp);
2842 return 7;
2843 }
2844
2845 static const struct file_operations client_ctl_fops = {
2846 .write = client_ctl_write,
2847 .release = simple_transaction_release,
2848 };
2849
2850 static const struct tree_descr client_files[] = {
2851 [0] = {"info", &client_info_fops, S_IRUSR},
2852 [1] = {"states", &client_states_fops, S_IRUSR},
2853 [2] = {"ctl", &client_ctl_fops, S_IWUSR},
2854 [3] = {""},
2855 };
2856
create_client(struct xdr_netobj name,struct svc_rqst * rqstp,nfs4_verifier * verf)2857 static struct nfs4_client *create_client(struct xdr_netobj name,
2858 struct svc_rqst *rqstp, nfs4_verifier *verf)
2859 {
2860 struct nfs4_client *clp;
2861 struct sockaddr *sa = svc_addr(rqstp);
2862 int ret;
2863 struct net *net = SVC_NET(rqstp);
2864 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2865 struct dentry *dentries[ARRAY_SIZE(client_files)];
2866
2867 clp = alloc_client(name, nn);
2868 if (clp == NULL)
2869 return NULL;
2870
2871 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2872 if (ret) {
2873 free_client(clp);
2874 return NULL;
2875 }
2876 gen_clid(clp, nn);
2877 kref_init(&clp->cl_nfsdfs.cl_ref);
2878 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2879 clp->cl_time = ktime_get_boottime_seconds();
2880 clear_bit(0, &clp->cl_cb_slot_busy);
2881 copy_verf(clp, verf);
2882 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2883 clp->cl_cb_session = NULL;
2884 clp->net = net;
2885 clp->cl_nfsd_dentry = nfsd_client_mkdir(
2886 nn, &clp->cl_nfsdfs,
2887 clp->cl_clientid.cl_id - nn->clientid_base,
2888 client_files, dentries);
2889 clp->cl_nfsd_info_dentry = dentries[0];
2890 if (!clp->cl_nfsd_dentry) {
2891 free_client(clp);
2892 return NULL;
2893 }
2894 return clp;
2895 }
2896
2897 static void
add_clp_to_name_tree(struct nfs4_client * new_clp,struct rb_root * root)2898 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2899 {
2900 struct rb_node **new = &(root->rb_node), *parent = NULL;
2901 struct nfs4_client *clp;
2902
2903 while (*new) {
2904 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2905 parent = *new;
2906
2907 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2908 new = &((*new)->rb_left);
2909 else
2910 new = &((*new)->rb_right);
2911 }
2912
2913 rb_link_node(&new_clp->cl_namenode, parent, new);
2914 rb_insert_color(&new_clp->cl_namenode, root);
2915 }
2916
2917 static struct nfs4_client *
find_clp_in_name_tree(struct xdr_netobj * name,struct rb_root * root)2918 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2919 {
2920 int cmp;
2921 struct rb_node *node = root->rb_node;
2922 struct nfs4_client *clp;
2923
2924 while (node) {
2925 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2926 cmp = compare_blob(&clp->cl_name, name);
2927 if (cmp > 0)
2928 node = node->rb_left;
2929 else if (cmp < 0)
2930 node = node->rb_right;
2931 else
2932 return clp;
2933 }
2934 return NULL;
2935 }
2936
2937 static void
add_to_unconfirmed(struct nfs4_client * clp)2938 add_to_unconfirmed(struct nfs4_client *clp)
2939 {
2940 unsigned int idhashval;
2941 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2942
2943 lockdep_assert_held(&nn->client_lock);
2944
2945 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2946 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2947 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2948 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2949 renew_client_locked(clp);
2950 }
2951
2952 static void
move_to_confirmed(struct nfs4_client * clp)2953 move_to_confirmed(struct nfs4_client *clp)
2954 {
2955 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2956 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2957
2958 lockdep_assert_held(&nn->client_lock);
2959
2960 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2961 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2962 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2963 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2964 trace_nfsd_clid_confirmed(&clp->cl_clientid);
2965 renew_client_locked(clp);
2966 }
2967
2968 static struct nfs4_client *
find_client_in_id_table(struct list_head * tbl,clientid_t * clid,bool sessions)2969 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2970 {
2971 struct nfs4_client *clp;
2972 unsigned int idhashval = clientid_hashval(clid->cl_id);
2973
2974 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2975 if (same_clid(&clp->cl_clientid, clid)) {
2976 if ((bool)clp->cl_minorversion != sessions)
2977 return NULL;
2978 renew_client_locked(clp);
2979 return clp;
2980 }
2981 }
2982 return NULL;
2983 }
2984
2985 static struct nfs4_client *
find_confirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)2986 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2987 {
2988 struct list_head *tbl = nn->conf_id_hashtbl;
2989
2990 lockdep_assert_held(&nn->client_lock);
2991 return find_client_in_id_table(tbl, clid, sessions);
2992 }
2993
2994 static struct nfs4_client *
find_unconfirmed_client(clientid_t * clid,bool sessions,struct nfsd_net * nn)2995 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2996 {
2997 struct list_head *tbl = nn->unconf_id_hashtbl;
2998
2999 lockdep_assert_held(&nn->client_lock);
3000 return find_client_in_id_table(tbl, clid, sessions);
3001 }
3002
clp_used_exchangeid(struct nfs4_client * clp)3003 static bool clp_used_exchangeid(struct nfs4_client *clp)
3004 {
3005 return clp->cl_exchange_flags != 0;
3006 }
3007
3008 static struct nfs4_client *
find_confirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3009 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3010 {
3011 lockdep_assert_held(&nn->client_lock);
3012 return find_clp_in_name_tree(name, &nn->conf_name_tree);
3013 }
3014
3015 static struct nfs4_client *
find_unconfirmed_client_by_name(struct xdr_netobj * name,struct nfsd_net * nn)3016 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3017 {
3018 lockdep_assert_held(&nn->client_lock);
3019 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
3020 }
3021
3022 static void
gen_callback(struct nfs4_client * clp,struct nfsd4_setclientid * se,struct svc_rqst * rqstp)3023 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3024 {
3025 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3026 struct sockaddr *sa = svc_addr(rqstp);
3027 u32 scopeid = rpc_get_scope_id(sa);
3028 unsigned short expected_family;
3029
3030 /* Currently, we only support tcp and tcp6 for the callback channel */
3031 if (se->se_callback_netid_len == 3 &&
3032 !memcmp(se->se_callback_netid_val, "tcp", 3))
3033 expected_family = AF_INET;
3034 else if (se->se_callback_netid_len == 4 &&
3035 !memcmp(se->se_callback_netid_val, "tcp6", 4))
3036 expected_family = AF_INET6;
3037 else
3038 goto out_err;
3039
3040 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3041 se->se_callback_addr_len,
3042 (struct sockaddr *)&conn->cb_addr,
3043 sizeof(conn->cb_addr));
3044
3045 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3046 goto out_err;
3047
3048 if (conn->cb_addr.ss_family == AF_INET6)
3049 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3050
3051 conn->cb_prog = se->se_callback_prog;
3052 conn->cb_ident = se->se_callback_ident;
3053 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3054 trace_nfsd_cb_args(clp, conn);
3055 return;
3056 out_err:
3057 conn->cb_addr.ss_family = AF_UNSPEC;
3058 conn->cb_addrlen = 0;
3059 trace_nfsd_cb_nodelegs(clp);
3060 return;
3061 }
3062
3063 /*
3064 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3065 */
3066 static void
nfsd4_store_cache_entry(struct nfsd4_compoundres * resp)3067 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3068 {
3069 struct xdr_buf *buf = resp->xdr->buf;
3070 struct nfsd4_slot *slot = resp->cstate.slot;
3071 unsigned int base;
3072
3073 dprintk("--> %s slot %p\n", __func__, slot);
3074
3075 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3076 slot->sl_opcnt = resp->opcnt;
3077 slot->sl_status = resp->cstate.status;
3078 free_svc_cred(&slot->sl_cred);
3079 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
3080
3081 if (!nfsd4_cache_this(resp)) {
3082 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3083 return;
3084 }
3085 slot->sl_flags |= NFSD4_SLOT_CACHED;
3086
3087 base = resp->cstate.data_offset;
3088 slot->sl_datalen = buf->len - base;
3089 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3090 WARN(1, "%s: sessions DRC could not cache compound\n",
3091 __func__);
3092 return;
3093 }
3094
3095 /*
3096 * Encode the replay sequence operation from the slot values.
3097 * If cachethis is FALSE encode the uncached rep error on the next
3098 * operation which sets resp->p and increments resp->opcnt for
3099 * nfs4svc_encode_compoundres.
3100 *
3101 */
3102 static __be32
nfsd4_enc_sequence_replay(struct nfsd4_compoundargs * args,struct nfsd4_compoundres * resp)3103 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3104 struct nfsd4_compoundres *resp)
3105 {
3106 struct nfsd4_op *op;
3107 struct nfsd4_slot *slot = resp->cstate.slot;
3108
3109 /* Encode the replayed sequence operation */
3110 op = &args->ops[resp->opcnt - 1];
3111 nfsd4_encode_operation(resp, op);
3112
3113 if (slot->sl_flags & NFSD4_SLOT_CACHED)
3114 return op->status;
3115 if (args->opcnt == 1) {
3116 /*
3117 * The original operation wasn't a solo sequence--we
3118 * always cache those--so this retry must not match the
3119 * original:
3120 */
3121 op->status = nfserr_seq_false_retry;
3122 } else {
3123 op = &args->ops[resp->opcnt++];
3124 op->status = nfserr_retry_uncached_rep;
3125 nfsd4_encode_operation(resp, op);
3126 }
3127 return op->status;
3128 }
3129
3130 /*
3131 * The sequence operation is not cached because we can use the slot and
3132 * session values.
3133 */
3134 static __be32
nfsd4_replay_cache_entry(struct nfsd4_compoundres * resp,struct nfsd4_sequence * seq)3135 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3136 struct nfsd4_sequence *seq)
3137 {
3138 struct nfsd4_slot *slot = resp->cstate.slot;
3139 struct xdr_stream *xdr = resp->xdr;
3140 __be32 *p;
3141 __be32 status;
3142
3143 dprintk("--> %s slot %p\n", __func__, slot);
3144
3145 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
3146 if (status)
3147 return status;
3148
3149 p = xdr_reserve_space(xdr, slot->sl_datalen);
3150 if (!p) {
3151 WARN_ON_ONCE(1);
3152 return nfserr_serverfault;
3153 }
3154 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
3155 xdr_commit_encode(xdr);
3156
3157 resp->opcnt = slot->sl_opcnt;
3158 return slot->sl_status;
3159 }
3160
3161 /*
3162 * Set the exchange_id flags returned by the server.
3163 */
3164 static void
nfsd4_set_ex_flags(struct nfs4_client * new,struct nfsd4_exchange_id * clid)3165 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3166 {
3167 #ifdef CONFIG_NFSD_PNFS
3168 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3169 #else
3170 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3171 #endif
3172
3173 /* Referrals are supported, Migration is not. */
3174 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3175
3176 /* set the wire flags to return to client. */
3177 clid->flags = new->cl_exchange_flags;
3178 }
3179
client_has_openowners(struct nfs4_client * clp)3180 static bool client_has_openowners(struct nfs4_client *clp)
3181 {
3182 struct nfs4_openowner *oo;
3183
3184 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3185 if (!list_empty(&oo->oo_owner.so_stateids))
3186 return true;
3187 }
3188 return false;
3189 }
3190
client_has_state(struct nfs4_client * clp)3191 static bool client_has_state(struct nfs4_client *clp)
3192 {
3193 return client_has_openowners(clp)
3194 #ifdef CONFIG_NFSD_PNFS
3195 || !list_empty(&clp->cl_lo_states)
3196 #endif
3197 || !list_empty(&clp->cl_delegations)
3198 || !list_empty(&clp->cl_sessions)
3199 || !list_empty(&clp->async_copies);
3200 }
3201
copy_impl_id(struct nfs4_client * clp,struct nfsd4_exchange_id * exid)3202 static __be32 copy_impl_id(struct nfs4_client *clp,
3203 struct nfsd4_exchange_id *exid)
3204 {
3205 if (!exid->nii_domain.data)
3206 return 0;
3207 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3208 if (!clp->cl_nii_domain.data)
3209 return nfserr_jukebox;
3210 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3211 if (!clp->cl_nii_name.data)
3212 return nfserr_jukebox;
3213 clp->cl_nii_time = exid->nii_time;
3214 return 0;
3215 }
3216
3217 __be32
nfsd4_exchange_id(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3218 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3219 union nfsd4_op_u *u)
3220 {
3221 struct nfsd4_exchange_id *exid = &u->exchange_id;
3222 struct nfs4_client *conf, *new;
3223 struct nfs4_client *unconf = NULL;
3224 __be32 status;
3225 char addr_str[INET6_ADDRSTRLEN];
3226 nfs4_verifier verf = exid->verifier;
3227 struct sockaddr *sa = svc_addr(rqstp);
3228 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3229 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3230
3231 rpc_ntop(sa, addr_str, sizeof(addr_str));
3232 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3233 "ip_addr=%s flags %x, spa_how %u\n",
3234 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3235 addr_str, exid->flags, exid->spa_how);
3236
3237 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3238 return nfserr_inval;
3239
3240 new = create_client(exid->clname, rqstp, &verf);
3241 if (new == NULL)
3242 return nfserr_jukebox;
3243 status = copy_impl_id(new, exid);
3244 if (status)
3245 goto out_nolock;
3246
3247 switch (exid->spa_how) {
3248 case SP4_MACH_CRED:
3249 exid->spo_must_enforce[0] = 0;
3250 exid->spo_must_enforce[1] = (
3251 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3252 1 << (OP_EXCHANGE_ID - 32) |
3253 1 << (OP_CREATE_SESSION - 32) |
3254 1 << (OP_DESTROY_SESSION - 32) |
3255 1 << (OP_DESTROY_CLIENTID - 32));
3256
3257 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3258 1 << (OP_OPEN_DOWNGRADE) |
3259 1 << (OP_LOCKU) |
3260 1 << (OP_DELEGRETURN));
3261
3262 exid->spo_must_allow[1] &= (
3263 1 << (OP_TEST_STATEID - 32) |
3264 1 << (OP_FREE_STATEID - 32));
3265 if (!svc_rqst_integrity_protected(rqstp)) {
3266 status = nfserr_inval;
3267 goto out_nolock;
3268 }
3269 /*
3270 * Sometimes userspace doesn't give us a principal.
3271 * Which is a bug, really. Anyway, we can't enforce
3272 * MACH_CRED in that case, better to give up now:
3273 */
3274 if (!new->cl_cred.cr_principal &&
3275 !new->cl_cred.cr_raw_principal) {
3276 status = nfserr_serverfault;
3277 goto out_nolock;
3278 }
3279 new->cl_mach_cred = true;
3280 break;
3281 case SP4_NONE:
3282 break;
3283 default: /* checked by xdr code */
3284 WARN_ON_ONCE(1);
3285 fallthrough;
3286 case SP4_SSV:
3287 status = nfserr_encr_alg_unsupp;
3288 goto out_nolock;
3289 }
3290
3291 /* Cases below refer to rfc 5661 section 18.35.4: */
3292 spin_lock(&nn->client_lock);
3293 conf = find_confirmed_client_by_name(&exid->clname, nn);
3294 if (conf) {
3295 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3296 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3297
3298 if (update) {
3299 if (!clp_used_exchangeid(conf)) { /* buggy client */
3300 status = nfserr_inval;
3301 goto out;
3302 }
3303 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3304 status = nfserr_wrong_cred;
3305 goto out;
3306 }
3307 if (!creds_match) { /* case 9 */
3308 status = nfserr_perm;
3309 goto out;
3310 }
3311 if (!verfs_match) { /* case 8 */
3312 status = nfserr_not_same;
3313 goto out;
3314 }
3315 /* case 6 */
3316 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3317 trace_nfsd_clid_confirmed_r(conf);
3318 goto out_copy;
3319 }
3320 if (!creds_match) { /* case 3 */
3321 if (client_has_state(conf)) {
3322 status = nfserr_clid_inuse;
3323 trace_nfsd_clid_cred_mismatch(conf, rqstp);
3324 goto out;
3325 }
3326 goto out_new;
3327 }
3328 if (verfs_match) { /* case 2 */
3329 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3330 trace_nfsd_clid_confirmed_r(conf);
3331 goto out_copy;
3332 }
3333 /* case 5, client reboot */
3334 trace_nfsd_clid_verf_mismatch(conf, rqstp, &verf);
3335 conf = NULL;
3336 goto out_new;
3337 }
3338
3339 if (update) { /* case 7 */
3340 status = nfserr_noent;
3341 goto out;
3342 }
3343
3344 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3345 if (unconf) /* case 4, possible retry or client restart */
3346 unhash_client_locked(unconf);
3347
3348 /* case 1, new owner ID */
3349 trace_nfsd_clid_fresh(new);
3350
3351 out_new:
3352 if (conf) {
3353 status = mark_client_expired_locked(conf);
3354 if (status)
3355 goto out;
3356 trace_nfsd_clid_replaced(&conf->cl_clientid);
3357 }
3358 new->cl_minorversion = cstate->minorversion;
3359 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3360 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3361
3362 add_to_unconfirmed(new);
3363 swap(new, conf);
3364 out_copy:
3365 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3366 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3367
3368 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3369 nfsd4_set_ex_flags(conf, exid);
3370
3371 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3372 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3373 status = nfs_ok;
3374
3375 out:
3376 spin_unlock(&nn->client_lock);
3377 out_nolock:
3378 if (new)
3379 expire_client(new);
3380 if (unconf) {
3381 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
3382 expire_client(unconf);
3383 }
3384 return status;
3385 }
3386
3387 static __be32
check_slot_seqid(u32 seqid,u32 slot_seqid,int slot_inuse)3388 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3389 {
3390 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3391 slot_seqid);
3392
3393 /* The slot is in use, and no response has been sent. */
3394 if (slot_inuse) {
3395 if (seqid == slot_seqid)
3396 return nfserr_jukebox;
3397 else
3398 return nfserr_seq_misordered;
3399 }
3400 /* Note unsigned 32-bit arithmetic handles wraparound: */
3401 if (likely(seqid == slot_seqid + 1))
3402 return nfs_ok;
3403 if (seqid == slot_seqid)
3404 return nfserr_replay_cache;
3405 return nfserr_seq_misordered;
3406 }
3407
3408 /*
3409 * Cache the create session result into the create session single DRC
3410 * slot cache by saving the xdr structure. sl_seqid has been set.
3411 * Do this for solo or embedded create session operations.
3412 */
3413 static void
nfsd4_cache_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot,__be32 nfserr)3414 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3415 struct nfsd4_clid_slot *slot, __be32 nfserr)
3416 {
3417 slot->sl_status = nfserr;
3418 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3419 }
3420
3421 static __be32
nfsd4_replay_create_session(struct nfsd4_create_session * cr_ses,struct nfsd4_clid_slot * slot)3422 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3423 struct nfsd4_clid_slot *slot)
3424 {
3425 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3426 return slot->sl_status;
3427 }
3428
3429 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3430 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3431 1 + /* MIN tag is length with zero, only length */ \
3432 3 + /* version, opcount, opcode */ \
3433 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3434 /* seqid, slotID, slotID, cache */ \
3435 4 ) * sizeof(__be32))
3436
3437 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3438 2 + /* verifier: AUTH_NULL, length 0 */\
3439 1 + /* status */ \
3440 1 + /* MIN tag is length with zero, only length */ \
3441 3 + /* opcount, opcode, opstatus*/ \
3442 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3443 /* seqid, slotID, slotID, slotID, status */ \
3444 5 ) * sizeof(__be32))
3445
check_forechannel_attrs(struct nfsd4_channel_attrs * ca,struct nfsd_net * nn)3446 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3447 {
3448 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3449
3450 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3451 return nfserr_toosmall;
3452 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3453 return nfserr_toosmall;
3454 ca->headerpadsz = 0;
3455 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3456 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3457 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3458 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3459 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3460 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3461 /*
3462 * Note decreasing slot size below client's request may make it
3463 * difficult for client to function correctly, whereas
3464 * decreasing the number of slots will (just?) affect
3465 * performance. When short on memory we therefore prefer to
3466 * decrease number of slots instead of their size. Clients that
3467 * request larger slots than they need will get poor results:
3468 * Note that we always allow at least one slot, because our
3469 * accounting is soft and provides no guarantees either way.
3470 */
3471 ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3472
3473 return nfs_ok;
3474 }
3475
3476 /*
3477 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3478 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3479 */
3480 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3481 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3482
3483 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3484 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3485
3486 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3487 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3488 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3489 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3490 sizeof(__be32))
3491
check_backchannel_attrs(struct nfsd4_channel_attrs * ca)3492 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3493 {
3494 ca->headerpadsz = 0;
3495
3496 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3497 return nfserr_toosmall;
3498 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3499 return nfserr_toosmall;
3500 ca->maxresp_cached = 0;
3501 if (ca->maxops < 2)
3502 return nfserr_toosmall;
3503
3504 return nfs_ok;
3505 }
3506
nfsd4_check_cb_sec(struct nfsd4_cb_sec * cbs)3507 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3508 {
3509 switch (cbs->flavor) {
3510 case RPC_AUTH_NULL:
3511 case RPC_AUTH_UNIX:
3512 return nfs_ok;
3513 default:
3514 /*
3515 * GSS case: the spec doesn't allow us to return this
3516 * error. But it also doesn't allow us not to support
3517 * GSS.
3518 * I'd rather this fail hard than return some error the
3519 * client might think it can already handle:
3520 */
3521 return nfserr_encr_alg_unsupp;
3522 }
3523 }
3524
3525 __be32
nfsd4_create_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3526 nfsd4_create_session(struct svc_rqst *rqstp,
3527 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3528 {
3529 struct nfsd4_create_session *cr_ses = &u->create_session;
3530 struct sockaddr *sa = svc_addr(rqstp);
3531 struct nfs4_client *conf, *unconf;
3532 struct nfs4_client *old = NULL;
3533 struct nfsd4_session *new;
3534 struct nfsd4_conn *conn;
3535 struct nfsd4_clid_slot *cs_slot = NULL;
3536 __be32 status = 0;
3537 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3538
3539 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3540 return nfserr_inval;
3541 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3542 if (status)
3543 return status;
3544 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3545 if (status)
3546 return status;
3547 status = check_backchannel_attrs(&cr_ses->back_channel);
3548 if (status)
3549 goto out_release_drc_mem;
3550 status = nfserr_jukebox;
3551 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3552 if (!new)
3553 goto out_release_drc_mem;
3554 conn = alloc_conn_from_crses(rqstp, cr_ses);
3555 if (!conn)
3556 goto out_free_session;
3557
3558 spin_lock(&nn->client_lock);
3559 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3560 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3561 WARN_ON_ONCE(conf && unconf);
3562
3563 if (conf) {
3564 status = nfserr_wrong_cred;
3565 if (!nfsd4_mach_creds_match(conf, rqstp))
3566 goto out_free_conn;
3567 cs_slot = &conf->cl_cs_slot;
3568 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3569 if (status) {
3570 if (status == nfserr_replay_cache)
3571 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3572 goto out_free_conn;
3573 }
3574 } else if (unconf) {
3575 status = nfserr_clid_inuse;
3576 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3577 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3578 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
3579 goto out_free_conn;
3580 }
3581 status = nfserr_wrong_cred;
3582 if (!nfsd4_mach_creds_match(unconf, rqstp))
3583 goto out_free_conn;
3584 cs_slot = &unconf->cl_cs_slot;
3585 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3586 if (status) {
3587 /* an unconfirmed replay returns misordered */
3588 status = nfserr_seq_misordered;
3589 goto out_free_conn;
3590 }
3591 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3592 if (old) {
3593 status = mark_client_expired_locked(old);
3594 if (status) {
3595 old = NULL;
3596 goto out_free_conn;
3597 }
3598 trace_nfsd_clid_replaced(&old->cl_clientid);
3599 }
3600 move_to_confirmed(unconf);
3601 conf = unconf;
3602 } else {
3603 status = nfserr_stale_clientid;
3604 goto out_free_conn;
3605 }
3606 status = nfs_ok;
3607 /* Persistent sessions are not supported */
3608 cr_ses->flags &= ~SESSION4_PERSIST;
3609 /* Upshifting from TCP to RDMA is not supported */
3610 cr_ses->flags &= ~SESSION4_RDMA;
3611
3612 init_session(rqstp, new, conf, cr_ses);
3613 nfsd4_get_session_locked(new);
3614
3615 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3616 NFS4_MAX_SESSIONID_LEN);
3617 cs_slot->sl_seqid++;
3618 cr_ses->seqid = cs_slot->sl_seqid;
3619
3620 /* cache solo and embedded create sessions under the client_lock */
3621 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3622 spin_unlock(&nn->client_lock);
3623 if (conf == unconf)
3624 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
3625 /* init connection and backchannel */
3626 nfsd4_init_conn(rqstp, conn, new);
3627 nfsd4_put_session(new);
3628 if (old)
3629 expire_client(old);
3630 return status;
3631 out_free_conn:
3632 spin_unlock(&nn->client_lock);
3633 free_conn(conn);
3634 if (old)
3635 expire_client(old);
3636 out_free_session:
3637 __free_session(new);
3638 out_release_drc_mem:
3639 nfsd4_put_drc_mem(&cr_ses->fore_channel);
3640 return status;
3641 }
3642
nfsd4_map_bcts_dir(u32 * dir)3643 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3644 {
3645 switch (*dir) {
3646 case NFS4_CDFC4_FORE:
3647 case NFS4_CDFC4_BACK:
3648 return nfs_ok;
3649 case NFS4_CDFC4_FORE_OR_BOTH:
3650 case NFS4_CDFC4_BACK_OR_BOTH:
3651 *dir = NFS4_CDFC4_BOTH;
3652 return nfs_ok;
3653 }
3654 return nfserr_inval;
3655 }
3656
nfsd4_backchannel_ctl(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3657 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3658 struct nfsd4_compound_state *cstate,
3659 union nfsd4_op_u *u)
3660 {
3661 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3662 struct nfsd4_session *session = cstate->session;
3663 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3664 __be32 status;
3665
3666 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3667 if (status)
3668 return status;
3669 spin_lock(&nn->client_lock);
3670 session->se_cb_prog = bc->bc_cb_program;
3671 session->se_cb_sec = bc->bc_cb_sec;
3672 spin_unlock(&nn->client_lock);
3673
3674 nfsd4_probe_callback(session->se_client);
3675
3676 return nfs_ok;
3677 }
3678
__nfsd4_find_conn(struct svc_xprt * xpt,struct nfsd4_session * s)3679 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3680 {
3681 struct nfsd4_conn *c;
3682
3683 list_for_each_entry(c, &s->se_conns, cn_persession) {
3684 if (c->cn_xprt == xpt) {
3685 return c;
3686 }
3687 }
3688 return NULL;
3689 }
3690
nfsd4_match_existing_connection(struct svc_rqst * rqst,struct nfsd4_session * session,u32 req,struct nfsd4_conn ** conn)3691 static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3692 struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
3693 {
3694 struct nfs4_client *clp = session->se_client;
3695 struct svc_xprt *xpt = rqst->rq_xprt;
3696 struct nfsd4_conn *c;
3697 __be32 status;
3698
3699 /* Following the last paragraph of RFC 5661 Section 18.34.3: */
3700 spin_lock(&clp->cl_lock);
3701 c = __nfsd4_find_conn(xpt, session);
3702 if (!c)
3703 status = nfserr_noent;
3704 else if (req == c->cn_flags)
3705 status = nfs_ok;
3706 else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3707 c->cn_flags != NFS4_CDFC4_BACK)
3708 status = nfs_ok;
3709 else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3710 c->cn_flags != NFS4_CDFC4_FORE)
3711 status = nfs_ok;
3712 else
3713 status = nfserr_inval;
3714 spin_unlock(&clp->cl_lock);
3715 if (status == nfs_ok && conn)
3716 *conn = c;
3717 return status;
3718 }
3719
nfsd4_bind_conn_to_session(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3720 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3721 struct nfsd4_compound_state *cstate,
3722 union nfsd4_op_u *u)
3723 {
3724 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3725 __be32 status;
3726 struct nfsd4_conn *conn;
3727 struct nfsd4_session *session;
3728 struct net *net = SVC_NET(rqstp);
3729 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3730
3731 if (!nfsd4_last_compound_op(rqstp))
3732 return nfserr_not_only_op;
3733 spin_lock(&nn->client_lock);
3734 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
3735 spin_unlock(&nn->client_lock);
3736 if (!session)
3737 goto out_no_session;
3738 status = nfserr_wrong_cred;
3739 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
3740 goto out;
3741 status = nfsd4_match_existing_connection(rqstp, session,
3742 bcts->dir, &conn);
3743 if (status == nfs_ok) {
3744 if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
3745 bcts->dir == NFS4_CDFC4_BACK)
3746 conn->cn_flags |= NFS4_CDFC4_BACK;
3747 nfsd4_probe_callback(session->se_client);
3748 goto out;
3749 }
3750 if (status == nfserr_inval)
3751 goto out;
3752 status = nfsd4_map_bcts_dir(&bcts->dir);
3753 if (status)
3754 goto out;
3755 conn = alloc_conn(rqstp, bcts->dir);
3756 status = nfserr_jukebox;
3757 if (!conn)
3758 goto out;
3759 nfsd4_init_conn(rqstp, conn, session);
3760 status = nfs_ok;
3761 out:
3762 nfsd4_put_session(session);
3763 out_no_session:
3764 return status;
3765 }
3766
nfsd4_compound_in_session(struct nfsd4_compound_state * cstate,struct nfs4_sessionid * sid)3767 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3768 {
3769 if (!cstate->session)
3770 return false;
3771 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
3772 }
3773
3774 __be32
nfsd4_destroy_session(struct svc_rqst * r,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3775 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3776 union nfsd4_op_u *u)
3777 {
3778 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3779 struct nfsd4_session *ses;
3780 __be32 status;
3781 int ref_held_by_me = 0;
3782 struct net *net = SVC_NET(r);
3783 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3784
3785 status = nfserr_not_only_op;
3786 if (nfsd4_compound_in_session(cstate, sessionid)) {
3787 if (!nfsd4_last_compound_op(r))
3788 goto out;
3789 ref_held_by_me++;
3790 }
3791 dump_sessionid(__func__, sessionid);
3792 spin_lock(&nn->client_lock);
3793 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
3794 if (!ses)
3795 goto out_client_lock;
3796 status = nfserr_wrong_cred;
3797 if (!nfsd4_mach_creds_match(ses->se_client, r))
3798 goto out_put_session;
3799 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
3800 if (status)
3801 goto out_put_session;
3802 unhash_session(ses);
3803 spin_unlock(&nn->client_lock);
3804
3805 nfsd4_probe_callback_sync(ses->se_client);
3806
3807 spin_lock(&nn->client_lock);
3808 status = nfs_ok;
3809 out_put_session:
3810 nfsd4_put_session_locked(ses);
3811 out_client_lock:
3812 spin_unlock(&nn->client_lock);
3813 out:
3814 return status;
3815 }
3816
nfsd4_sequence_check_conn(struct nfsd4_conn * new,struct nfsd4_session * ses)3817 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3818 {
3819 struct nfs4_client *clp = ses->se_client;
3820 struct nfsd4_conn *c;
3821 __be32 status = nfs_ok;
3822 int ret;
3823
3824 spin_lock(&clp->cl_lock);
3825 c = __nfsd4_find_conn(new->cn_xprt, ses);
3826 if (c)
3827 goto out_free;
3828 status = nfserr_conn_not_bound_to_session;
3829 if (clp->cl_mach_cred)
3830 goto out_free;
3831 __nfsd4_hash_conn(new, ses);
3832 spin_unlock(&clp->cl_lock);
3833 ret = nfsd4_register_conn(new);
3834 if (ret)
3835 /* oops; xprt is already down: */
3836 nfsd4_conn_lost(&new->cn_xpt_user);
3837 return nfs_ok;
3838 out_free:
3839 spin_unlock(&clp->cl_lock);
3840 free_conn(new);
3841 return status;
3842 }
3843
nfsd4_session_too_many_ops(struct svc_rqst * rqstp,struct nfsd4_session * session)3844 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3845 {
3846 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3847
3848 return args->opcnt > session->se_fchannel.maxops;
3849 }
3850
nfsd4_request_too_big(struct svc_rqst * rqstp,struct nfsd4_session * session)3851 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3852 struct nfsd4_session *session)
3853 {
3854 struct xdr_buf *xb = &rqstp->rq_arg;
3855
3856 return xb->len > session->se_fchannel.maxreq_sz;
3857 }
3858
replay_matches_cache(struct svc_rqst * rqstp,struct nfsd4_sequence * seq,struct nfsd4_slot * slot)3859 static bool replay_matches_cache(struct svc_rqst *rqstp,
3860 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3861 {
3862 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3863
3864 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3865 (bool)seq->cachethis)
3866 return false;
3867 /*
3868 * If there's an error then the reply can have fewer ops than
3869 * the call.
3870 */
3871 if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3872 return false;
3873 /*
3874 * But if we cached a reply with *more* ops than the call you're
3875 * sending us now, then this new call is clearly not really a
3876 * replay of the old one:
3877 */
3878 if (slot->sl_opcnt > argp->opcnt)
3879 return false;
3880 /* This is the only check explicitly called by spec: */
3881 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3882 return false;
3883 /*
3884 * There may be more comparisons we could actually do, but the
3885 * spec doesn't require us to catch every case where the calls
3886 * don't match (that would require caching the call as well as
3887 * the reply), so we don't bother.
3888 */
3889 return true;
3890 }
3891
3892 __be32
nfsd4_sequence(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)3893 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3894 union nfsd4_op_u *u)
3895 {
3896 struct nfsd4_sequence *seq = &u->sequence;
3897 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3898 struct xdr_stream *xdr = resp->xdr;
3899 struct nfsd4_session *session;
3900 struct nfs4_client *clp;
3901 struct nfsd4_slot *slot;
3902 struct nfsd4_conn *conn;
3903 __be32 status;
3904 int buflen;
3905 struct net *net = SVC_NET(rqstp);
3906 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3907
3908 if (resp->opcnt != 1)
3909 return nfserr_sequence_pos;
3910
3911 /*
3912 * Will be either used or freed by nfsd4_sequence_check_conn
3913 * below.
3914 */
3915 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3916 if (!conn)
3917 return nfserr_jukebox;
3918
3919 spin_lock(&nn->client_lock);
3920 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3921 if (!session)
3922 goto out_no_session;
3923 clp = session->se_client;
3924
3925 status = nfserr_too_many_ops;
3926 if (nfsd4_session_too_many_ops(rqstp, session))
3927 goto out_put_session;
3928
3929 status = nfserr_req_too_big;
3930 if (nfsd4_request_too_big(rqstp, session))
3931 goto out_put_session;
3932
3933 status = nfserr_badslot;
3934 if (seq->slotid >= session->se_fchannel.maxreqs)
3935 goto out_put_session;
3936
3937 slot = session->se_slots[seq->slotid];
3938 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3939
3940 /* We do not negotiate the number of slots yet, so set the
3941 * maxslots to the session maxreqs which is used to encode
3942 * sr_highest_slotid and the sr_target_slot id to maxslots */
3943 seq->maxslots = session->se_fchannel.maxreqs;
3944
3945 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3946 slot->sl_flags & NFSD4_SLOT_INUSE);
3947 if (status == nfserr_replay_cache) {
3948 status = nfserr_seq_misordered;
3949 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3950 goto out_put_session;
3951 status = nfserr_seq_false_retry;
3952 if (!replay_matches_cache(rqstp, seq, slot))
3953 goto out_put_session;
3954 cstate->slot = slot;
3955 cstate->session = session;
3956 cstate->clp = clp;
3957 /* Return the cached reply status and set cstate->status
3958 * for nfsd4_proc_compound processing */
3959 status = nfsd4_replay_cache_entry(resp, seq);
3960 cstate->status = nfserr_replay_cache;
3961 goto out;
3962 }
3963 if (status)
3964 goto out_put_session;
3965
3966 status = nfsd4_sequence_check_conn(conn, session);
3967 conn = NULL;
3968 if (status)
3969 goto out_put_session;
3970
3971 buflen = (seq->cachethis) ?
3972 session->se_fchannel.maxresp_cached :
3973 session->se_fchannel.maxresp_sz;
3974 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3975 nfserr_rep_too_big;
3976 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3977 goto out_put_session;
3978 svc_reserve(rqstp, buflen);
3979
3980 status = nfs_ok;
3981 /* Success! bump slot seqid */
3982 slot->sl_seqid = seq->seqid;
3983 slot->sl_flags |= NFSD4_SLOT_INUSE;
3984 if (seq->cachethis)
3985 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3986 else
3987 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3988
3989 cstate->slot = slot;
3990 cstate->session = session;
3991 cstate->clp = clp;
3992
3993 out:
3994 switch (clp->cl_cb_state) {
3995 case NFSD4_CB_DOWN:
3996 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3997 break;
3998 case NFSD4_CB_FAULT:
3999 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4000 break;
4001 default:
4002 seq->status_flags = 0;
4003 }
4004 if (!list_empty(&clp->cl_revoked))
4005 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4006 out_no_session:
4007 if (conn)
4008 free_conn(conn);
4009 spin_unlock(&nn->client_lock);
4010 return status;
4011 out_put_session:
4012 nfsd4_put_session_locked(session);
4013 goto out_no_session;
4014 }
4015
4016 void
nfsd4_sequence_done(struct nfsd4_compoundres * resp)4017 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4018 {
4019 struct nfsd4_compound_state *cs = &resp->cstate;
4020
4021 if (nfsd4_has_session(cs)) {
4022 if (cs->status != nfserr_replay_cache) {
4023 nfsd4_store_cache_entry(resp);
4024 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4025 }
4026 /* Drop session reference that was taken in nfsd4_sequence() */
4027 nfsd4_put_session(cs->session);
4028 } else if (cs->clp)
4029 put_client_renew(cs->clp);
4030 }
4031
4032 __be32
nfsd4_destroy_clientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4033 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4034 struct nfsd4_compound_state *cstate,
4035 union nfsd4_op_u *u)
4036 {
4037 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4038 struct nfs4_client *conf, *unconf;
4039 struct nfs4_client *clp = NULL;
4040 __be32 status = 0;
4041 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4042
4043 spin_lock(&nn->client_lock);
4044 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
4045 conf = find_confirmed_client(&dc->clientid, true, nn);
4046 WARN_ON_ONCE(conf && unconf);
4047
4048 if (conf) {
4049 if (client_has_state(conf)) {
4050 status = nfserr_clientid_busy;
4051 goto out;
4052 }
4053 status = mark_client_expired_locked(conf);
4054 if (status)
4055 goto out;
4056 clp = conf;
4057 } else if (unconf)
4058 clp = unconf;
4059 else {
4060 status = nfserr_stale_clientid;
4061 goto out;
4062 }
4063 if (!nfsd4_mach_creds_match(clp, rqstp)) {
4064 clp = NULL;
4065 status = nfserr_wrong_cred;
4066 goto out;
4067 }
4068 trace_nfsd_clid_destroyed(&clp->cl_clientid);
4069 unhash_client_locked(clp);
4070 out:
4071 spin_unlock(&nn->client_lock);
4072 if (clp)
4073 expire_client(clp);
4074 return status;
4075 }
4076
4077 __be32
nfsd4_reclaim_complete(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4078 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4079 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4080 {
4081 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4082 struct nfs4_client *clp = cstate->clp;
4083 __be32 status = 0;
4084
4085 if (rc->rca_one_fs) {
4086 if (!cstate->current_fh.fh_dentry)
4087 return nfserr_nofilehandle;
4088 /*
4089 * We don't take advantage of the rca_one_fs case.
4090 * That's OK, it's optional, we can safely ignore it.
4091 */
4092 return nfs_ok;
4093 }
4094
4095 status = nfserr_complete_already;
4096 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
4097 goto out;
4098
4099 status = nfserr_stale_clientid;
4100 if (is_client_expired(clp))
4101 /*
4102 * The following error isn't really legal.
4103 * But we only get here if the client just explicitly
4104 * destroyed the client. Surely it no longer cares what
4105 * error it gets back on an operation for the dead
4106 * client.
4107 */
4108 goto out;
4109
4110 status = nfs_ok;
4111 trace_nfsd_clid_reclaim_complete(&clp->cl_clientid);
4112 nfsd4_client_record_create(clp);
4113 inc_reclaim_complete(clp);
4114 out:
4115 return status;
4116 }
4117
4118 __be32
nfsd4_setclientid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4119 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4120 union nfsd4_op_u *u)
4121 {
4122 struct nfsd4_setclientid *setclid = &u->setclientid;
4123 struct xdr_netobj clname = setclid->se_name;
4124 nfs4_verifier clverifier = setclid->se_verf;
4125 struct nfs4_client *conf, *new;
4126 struct nfs4_client *unconf = NULL;
4127 __be32 status;
4128 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4129
4130 new = create_client(clname, rqstp, &clverifier);
4131 if (new == NULL)
4132 return nfserr_jukebox;
4133 spin_lock(&nn->client_lock);
4134 conf = find_confirmed_client_by_name(&clname, nn);
4135 if (conf && client_has_state(conf)) {
4136 status = nfserr_clid_inuse;
4137 if (clp_used_exchangeid(conf))
4138 goto out;
4139 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4140 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4141 goto out;
4142 }
4143 }
4144 unconf = find_unconfirmed_client_by_name(&clname, nn);
4145 if (unconf)
4146 unhash_client_locked(unconf);
4147 if (conf) {
4148 if (same_verf(&conf->cl_verifier, &clverifier)) {
4149 copy_clid(new, conf);
4150 gen_confirm(new, nn);
4151 } else
4152 trace_nfsd_clid_verf_mismatch(conf, rqstp,
4153 &clverifier);
4154 } else
4155 trace_nfsd_clid_fresh(new);
4156 new->cl_minorversion = 0;
4157 gen_callback(new, setclid, rqstp);
4158 add_to_unconfirmed(new);
4159 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4160 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4161 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4162 new = NULL;
4163 status = nfs_ok;
4164 out:
4165 spin_unlock(&nn->client_lock);
4166 if (new)
4167 free_client(new);
4168 if (unconf) {
4169 trace_nfsd_clid_expire_unconf(&unconf->cl_clientid);
4170 expire_client(unconf);
4171 }
4172 return status;
4173 }
4174
4175 __be32
nfsd4_setclientid_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)4176 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4177 struct nfsd4_compound_state *cstate,
4178 union nfsd4_op_u *u)
4179 {
4180 struct nfsd4_setclientid_confirm *setclientid_confirm =
4181 &u->setclientid_confirm;
4182 struct nfs4_client *conf, *unconf;
4183 struct nfs4_client *old = NULL;
4184 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4185 clientid_t * clid = &setclientid_confirm->sc_clientid;
4186 __be32 status;
4187 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4188
4189 if (STALE_CLIENTID(clid, nn))
4190 return nfserr_stale_clientid;
4191
4192 spin_lock(&nn->client_lock);
4193 conf = find_confirmed_client(clid, false, nn);
4194 unconf = find_unconfirmed_client(clid, false, nn);
4195 /*
4196 * We try hard to give out unique clientid's, so if we get an
4197 * attempt to confirm the same clientid with a different cred,
4198 * the client may be buggy; this should never happen.
4199 *
4200 * Nevertheless, RFC 7530 recommends INUSE for this case:
4201 */
4202 status = nfserr_clid_inuse;
4203 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
4204 trace_nfsd_clid_cred_mismatch(unconf, rqstp);
4205 goto out;
4206 }
4207 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
4208 trace_nfsd_clid_cred_mismatch(conf, rqstp);
4209 goto out;
4210 }
4211 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
4212 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
4213 status = nfs_ok;
4214 } else
4215 status = nfserr_stale_clientid;
4216 goto out;
4217 }
4218 status = nfs_ok;
4219 if (conf) {
4220 old = unconf;
4221 unhash_client_locked(old);
4222 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
4223 } else {
4224 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
4225 if (old) {
4226 status = nfserr_clid_inuse;
4227 if (client_has_state(old)
4228 && !same_creds(&unconf->cl_cred,
4229 &old->cl_cred)) {
4230 old = NULL;
4231 goto out;
4232 }
4233 status = mark_client_expired_locked(old);
4234 if (status) {
4235 old = NULL;
4236 goto out;
4237 }
4238 trace_nfsd_clid_replaced(&old->cl_clientid);
4239 }
4240 move_to_confirmed(unconf);
4241 conf = unconf;
4242 }
4243 get_client_locked(conf);
4244 spin_unlock(&nn->client_lock);
4245 if (conf == unconf)
4246 fsnotify_dentry(conf->cl_nfsd_info_dentry, FS_MODIFY);
4247 nfsd4_probe_callback(conf);
4248 spin_lock(&nn->client_lock);
4249 put_client_renew_locked(conf);
4250 out:
4251 spin_unlock(&nn->client_lock);
4252 if (old)
4253 expire_client(old);
4254 return status;
4255 }
4256
nfsd4_alloc_file(void)4257 static struct nfs4_file *nfsd4_alloc_file(void)
4258 {
4259 return kmem_cache_alloc(file_slab, GFP_KERNEL);
4260 }
4261
4262 /* OPEN Share state helper functions */
nfsd4_init_file(struct svc_fh * fh,unsigned int hashval,struct nfs4_file * fp)4263 static void nfsd4_init_file(struct svc_fh *fh, unsigned int hashval,
4264 struct nfs4_file *fp)
4265 {
4266 lockdep_assert_held(&state_lock);
4267
4268 refcount_set(&fp->fi_ref, 1);
4269 spin_lock_init(&fp->fi_lock);
4270 INIT_LIST_HEAD(&fp->fi_stateids);
4271 INIT_LIST_HEAD(&fp->fi_delegations);
4272 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4273 fh_copy_shallow(&fp->fi_fhandle, &fh->fh_handle);
4274 fp->fi_deleg_file = NULL;
4275 fp->fi_had_conflict = false;
4276 fp->fi_share_deny = 0;
4277 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4278 memset(fp->fi_access, 0, sizeof(fp->fi_access));
4279 fp->fi_aliased = false;
4280 fp->fi_inode = d_inode(fh->fh_dentry);
4281 #ifdef CONFIG_NFSD_PNFS
4282 INIT_LIST_HEAD(&fp->fi_lo_states);
4283 atomic_set(&fp->fi_lo_recalls, 0);
4284 #endif
4285 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
4286 }
4287
4288 void
nfsd4_free_slabs(void)4289 nfsd4_free_slabs(void)
4290 {
4291 kmem_cache_destroy(client_slab);
4292 kmem_cache_destroy(openowner_slab);
4293 kmem_cache_destroy(lockowner_slab);
4294 kmem_cache_destroy(file_slab);
4295 kmem_cache_destroy(stateid_slab);
4296 kmem_cache_destroy(deleg_slab);
4297 kmem_cache_destroy(odstate_slab);
4298 }
4299
4300 int
nfsd4_init_slabs(void)4301 nfsd4_init_slabs(void)
4302 {
4303 client_slab = kmem_cache_create("nfsd4_clients",
4304 sizeof(struct nfs4_client), 0, 0, NULL);
4305 if (client_slab == NULL)
4306 goto out;
4307 openowner_slab = kmem_cache_create("nfsd4_openowners",
4308 sizeof(struct nfs4_openowner), 0, 0, NULL);
4309 if (openowner_slab == NULL)
4310 goto out_free_client_slab;
4311 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
4312 sizeof(struct nfs4_lockowner), 0, 0, NULL);
4313 if (lockowner_slab == NULL)
4314 goto out_free_openowner_slab;
4315 file_slab = kmem_cache_create("nfsd4_files",
4316 sizeof(struct nfs4_file), 0, 0, NULL);
4317 if (file_slab == NULL)
4318 goto out_free_lockowner_slab;
4319 stateid_slab = kmem_cache_create("nfsd4_stateids",
4320 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
4321 if (stateid_slab == NULL)
4322 goto out_free_file_slab;
4323 deleg_slab = kmem_cache_create("nfsd4_delegations",
4324 sizeof(struct nfs4_delegation), 0, 0, NULL);
4325 if (deleg_slab == NULL)
4326 goto out_free_stateid_slab;
4327 odstate_slab = kmem_cache_create("nfsd4_odstate",
4328 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
4329 if (odstate_slab == NULL)
4330 goto out_free_deleg_slab;
4331 return 0;
4332
4333 out_free_deleg_slab:
4334 kmem_cache_destroy(deleg_slab);
4335 out_free_stateid_slab:
4336 kmem_cache_destroy(stateid_slab);
4337 out_free_file_slab:
4338 kmem_cache_destroy(file_slab);
4339 out_free_lockowner_slab:
4340 kmem_cache_destroy(lockowner_slab);
4341 out_free_openowner_slab:
4342 kmem_cache_destroy(openowner_slab);
4343 out_free_client_slab:
4344 kmem_cache_destroy(client_slab);
4345 out:
4346 return -ENOMEM;
4347 }
4348
4349 static unsigned long
nfsd_courtesy_client_count(struct shrinker * shrink,struct shrink_control * sc)4350 nfsd_courtesy_client_count(struct shrinker *shrink, struct shrink_control *sc)
4351 {
4352 int cnt;
4353 struct nfsd_net *nn = container_of(shrink,
4354 struct nfsd_net, nfsd_client_shrinker);
4355
4356 cnt = atomic_read(&nn->nfsd_courtesy_clients);
4357 if (cnt > 0)
4358 mod_delayed_work(laundry_wq, &nn->nfsd_shrinker_work, 0);
4359 return (unsigned long)cnt;
4360 }
4361
4362 static unsigned long
nfsd_courtesy_client_scan(struct shrinker * shrink,struct shrink_control * sc)4363 nfsd_courtesy_client_scan(struct shrinker *shrink, struct shrink_control *sc)
4364 {
4365 return SHRINK_STOP;
4366 }
4367
4368 int
nfsd4_init_leases_net(struct nfsd_net * nn)4369 nfsd4_init_leases_net(struct nfsd_net *nn)
4370 {
4371 struct sysinfo si;
4372 u64 max_clients;
4373
4374 nn->nfsd4_lease = 90; /* default lease time */
4375 nn->nfsd4_grace = 90;
4376 nn->somebody_reclaimed = false;
4377 nn->track_reclaim_completes = false;
4378 nn->clverifier_counter = get_random_u32();
4379 nn->clientid_base = get_random_u32();
4380 nn->clientid_counter = nn->clientid_base + 1;
4381 nn->s2s_cp_cl_id = nn->clientid_counter++;
4382
4383 atomic_set(&nn->nfs4_client_count, 0);
4384 si_meminfo(&si);
4385 max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4386 max_clients *= NFS4_CLIENTS_PER_GB;
4387 nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4388
4389 atomic_set(&nn->nfsd_courtesy_clients, 0);
4390 nn->nfsd_client_shrinker.scan_objects = nfsd_courtesy_client_scan;
4391 nn->nfsd_client_shrinker.count_objects = nfsd_courtesy_client_count;
4392 nn->nfsd_client_shrinker.seeks = DEFAULT_SEEKS;
4393 return register_shrinker(&nn->nfsd_client_shrinker, "nfsd-client");
4394 }
4395
4396 void
nfsd4_leases_net_shutdown(struct nfsd_net * nn)4397 nfsd4_leases_net_shutdown(struct nfsd_net *nn)
4398 {
4399 unregister_shrinker(&nn->nfsd_client_shrinker);
4400 }
4401
init_nfs4_replay(struct nfs4_replay * rp)4402 static void init_nfs4_replay(struct nfs4_replay *rp)
4403 {
4404 rp->rp_status = nfserr_serverfault;
4405 rp->rp_buflen = 0;
4406 rp->rp_buf = rp->rp_ibuf;
4407 mutex_init(&rp->rp_mutex);
4408 }
4409
nfsd4_cstate_assign_replay(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so)4410 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4411 struct nfs4_stateowner *so)
4412 {
4413 if (!nfsd4_has_session(cstate)) {
4414 mutex_lock(&so->so_replay.rp_mutex);
4415 cstate->replay_owner = nfs4_get_stateowner(so);
4416 }
4417 }
4418
nfsd4_cstate_clear_replay(struct nfsd4_compound_state * cstate)4419 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4420 {
4421 struct nfs4_stateowner *so = cstate->replay_owner;
4422
4423 if (so != NULL) {
4424 cstate->replay_owner = NULL;
4425 mutex_unlock(&so->so_replay.rp_mutex);
4426 nfs4_put_stateowner(so);
4427 }
4428 }
4429
alloc_stateowner(struct kmem_cache * slab,struct xdr_netobj * owner,struct nfs4_client * clp)4430 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4431 {
4432 struct nfs4_stateowner *sop;
4433
4434 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4435 if (!sop)
4436 return NULL;
4437
4438 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4439 if (!sop->so_owner.data) {
4440 kmem_cache_free(slab, sop);
4441 return NULL;
4442 }
4443
4444 INIT_LIST_HEAD(&sop->so_stateids);
4445 sop->so_client = clp;
4446 init_nfs4_replay(&sop->so_replay);
4447 atomic_set(&sop->so_count, 1);
4448 return sop;
4449 }
4450
hash_openowner(struct nfs4_openowner * oo,struct nfs4_client * clp,unsigned int strhashval)4451 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4452 {
4453 lockdep_assert_held(&clp->cl_lock);
4454
4455 list_add(&oo->oo_owner.so_strhash,
4456 &clp->cl_ownerstr_hashtbl[strhashval]);
4457 list_add(&oo->oo_perclient, &clp->cl_openowners);
4458 }
4459
nfs4_unhash_openowner(struct nfs4_stateowner * so)4460 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4461 {
4462 unhash_openowner_locked(openowner(so));
4463 }
4464
nfs4_free_openowner(struct nfs4_stateowner * so)4465 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4466 {
4467 struct nfs4_openowner *oo = openowner(so);
4468
4469 kmem_cache_free(openowner_slab, oo);
4470 }
4471
4472 static const struct nfs4_stateowner_operations openowner_ops = {
4473 .so_unhash = nfs4_unhash_openowner,
4474 .so_free = nfs4_free_openowner,
4475 };
4476
4477 static struct nfs4_ol_stateid *
nfsd4_find_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4478 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4479 {
4480 struct nfs4_ol_stateid *local, *ret = NULL;
4481 struct nfs4_openowner *oo = open->op_openowner;
4482
4483 lockdep_assert_held(&fp->fi_lock);
4484
4485 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4486 /* ignore lock owners */
4487 if (local->st_stateowner->so_is_open_owner == 0)
4488 continue;
4489 if (local->st_stateowner != &oo->oo_owner)
4490 continue;
4491 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4492 ret = local;
4493 refcount_inc(&ret->st_stid.sc_count);
4494 break;
4495 }
4496 }
4497 return ret;
4498 }
4499
4500 static __be32
nfsd4_verify_open_stid(struct nfs4_stid * s)4501 nfsd4_verify_open_stid(struct nfs4_stid *s)
4502 {
4503 __be32 ret = nfs_ok;
4504
4505 switch (s->sc_type) {
4506 default:
4507 break;
4508 case 0:
4509 case NFS4_CLOSED_STID:
4510 case NFS4_CLOSED_DELEG_STID:
4511 ret = nfserr_bad_stateid;
4512 break;
4513 case NFS4_REVOKED_DELEG_STID:
4514 ret = nfserr_deleg_revoked;
4515 }
4516 return ret;
4517 }
4518
4519 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4520 static __be32
nfsd4_lock_ol_stateid(struct nfs4_ol_stateid * stp)4521 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4522 {
4523 __be32 ret;
4524
4525 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4526 ret = nfsd4_verify_open_stid(&stp->st_stid);
4527 if (ret != nfs_ok)
4528 mutex_unlock(&stp->st_mutex);
4529 return ret;
4530 }
4531
4532 static struct nfs4_ol_stateid *
nfsd4_find_and_lock_existing_open(struct nfs4_file * fp,struct nfsd4_open * open)4533 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4534 {
4535 struct nfs4_ol_stateid *stp;
4536 for (;;) {
4537 spin_lock(&fp->fi_lock);
4538 stp = nfsd4_find_existing_open(fp, open);
4539 spin_unlock(&fp->fi_lock);
4540 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4541 break;
4542 nfs4_put_stid(&stp->st_stid);
4543 }
4544 return stp;
4545 }
4546
4547 static struct nfs4_openowner *
alloc_init_open_stateowner(unsigned int strhashval,struct nfsd4_open * open,struct nfsd4_compound_state * cstate)4548 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4549 struct nfsd4_compound_state *cstate)
4550 {
4551 struct nfs4_client *clp = cstate->clp;
4552 struct nfs4_openowner *oo, *ret;
4553
4554 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4555 if (!oo)
4556 return NULL;
4557 oo->oo_owner.so_ops = &openowner_ops;
4558 oo->oo_owner.so_is_open_owner = 1;
4559 oo->oo_owner.so_seqid = open->op_seqid;
4560 oo->oo_flags = 0;
4561 if (nfsd4_has_session(cstate))
4562 oo->oo_flags |= NFS4_OO_CONFIRMED;
4563 oo->oo_time = 0;
4564 oo->oo_last_closed_stid = NULL;
4565 INIT_LIST_HEAD(&oo->oo_close_lru);
4566 spin_lock(&clp->cl_lock);
4567 ret = find_openstateowner_str_locked(strhashval, open, clp);
4568 if (ret == NULL) {
4569 hash_openowner(oo, clp, strhashval);
4570 ret = oo;
4571 } else
4572 nfs4_free_stateowner(&oo->oo_owner);
4573
4574 spin_unlock(&clp->cl_lock);
4575 return ret;
4576 }
4577
4578 static struct nfs4_ol_stateid *
init_open_stateid(struct nfs4_file * fp,struct nfsd4_open * open)4579 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4580 {
4581
4582 struct nfs4_openowner *oo = open->op_openowner;
4583 struct nfs4_ol_stateid *retstp = NULL;
4584 struct nfs4_ol_stateid *stp;
4585
4586 stp = open->op_stp;
4587 /* We are moving these outside of the spinlocks to avoid the warnings */
4588 mutex_init(&stp->st_mutex);
4589 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4590
4591 retry:
4592 spin_lock(&oo->oo_owner.so_client->cl_lock);
4593 spin_lock(&fp->fi_lock);
4594
4595 retstp = nfsd4_find_existing_open(fp, open);
4596 if (retstp)
4597 goto out_unlock;
4598
4599 open->op_stp = NULL;
4600 refcount_inc(&stp->st_stid.sc_count);
4601 stp->st_stid.sc_type = NFS4_OPEN_STID;
4602 INIT_LIST_HEAD(&stp->st_locks);
4603 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4604 get_nfs4_file(fp);
4605 stp->st_stid.sc_file = fp;
4606 stp->st_access_bmap = 0;
4607 stp->st_deny_bmap = 0;
4608 stp->st_openstp = NULL;
4609 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4610 list_add(&stp->st_perfile, &fp->fi_stateids);
4611
4612 out_unlock:
4613 spin_unlock(&fp->fi_lock);
4614 spin_unlock(&oo->oo_owner.so_client->cl_lock);
4615 if (retstp) {
4616 /* Handle races with CLOSE */
4617 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4618 nfs4_put_stid(&retstp->st_stid);
4619 goto retry;
4620 }
4621 /* To keep mutex tracking happy */
4622 mutex_unlock(&stp->st_mutex);
4623 stp = retstp;
4624 }
4625 return stp;
4626 }
4627
4628 /*
4629 * In the 4.0 case we need to keep the owners around a little while to handle
4630 * CLOSE replay. We still do need to release any file access that is held by
4631 * them before returning however.
4632 */
4633 static void
move_to_close_lru(struct nfs4_ol_stateid * s,struct net * net)4634 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4635 {
4636 struct nfs4_ol_stateid *last;
4637 struct nfs4_openowner *oo = openowner(s->st_stateowner);
4638 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4639 nfsd_net_id);
4640
4641 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4642
4643 /*
4644 * We know that we hold one reference via nfsd4_close, and another
4645 * "persistent" reference for the client. If the refcount is higher
4646 * than 2, then there are still calls in progress that are using this
4647 * stateid. We can't put the sc_file reference until they are finished.
4648 * Wait for the refcount to drop to 2. Since it has been unhashed,
4649 * there should be no danger of the refcount going back up again at
4650 * this point.
4651 */
4652 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4653
4654 release_all_access(s);
4655 if (s->st_stid.sc_file) {
4656 put_nfs4_file(s->st_stid.sc_file);
4657 s->st_stid.sc_file = NULL;
4658 }
4659
4660 spin_lock(&nn->client_lock);
4661 last = oo->oo_last_closed_stid;
4662 oo->oo_last_closed_stid = s;
4663 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4664 oo->oo_time = ktime_get_boottime_seconds();
4665 spin_unlock(&nn->client_lock);
4666 if (last)
4667 nfs4_put_stid(&last->st_stid);
4668 }
4669
4670 /* search file_hashtbl[] for file */
4671 static struct nfs4_file *
find_file_locked(struct svc_fh * fh,unsigned int hashval)4672 find_file_locked(struct svc_fh *fh, unsigned int hashval)
4673 {
4674 struct nfs4_file *fp;
4675
4676 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4677 lockdep_is_held(&state_lock)) {
4678 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4679 if (refcount_inc_not_zero(&fp->fi_ref))
4680 return fp;
4681 }
4682 }
4683 return NULL;
4684 }
4685
insert_file(struct nfs4_file * new,struct svc_fh * fh,unsigned int hashval)4686 static struct nfs4_file *insert_file(struct nfs4_file *new, struct svc_fh *fh,
4687 unsigned int hashval)
4688 {
4689 struct nfs4_file *fp;
4690 struct nfs4_file *ret = NULL;
4691 bool alias_found = false;
4692
4693 spin_lock(&state_lock);
4694 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4695 lockdep_is_held(&state_lock)) {
4696 if (fh_match(&fp->fi_fhandle, &fh->fh_handle)) {
4697 if (refcount_inc_not_zero(&fp->fi_ref))
4698 ret = fp;
4699 } else if (d_inode(fh->fh_dentry) == fp->fi_inode)
4700 fp->fi_aliased = alias_found = true;
4701 }
4702 if (likely(ret == NULL)) {
4703 nfsd4_init_file(fh, hashval, new);
4704 new->fi_aliased = alias_found;
4705 ret = new;
4706 }
4707 spin_unlock(&state_lock);
4708 return ret;
4709 }
4710
find_file(struct svc_fh * fh)4711 static struct nfs4_file * find_file(struct svc_fh *fh)
4712 {
4713 struct nfs4_file *fp;
4714 unsigned int hashval = file_hashval(fh);
4715
4716 rcu_read_lock();
4717 fp = find_file_locked(fh, hashval);
4718 rcu_read_unlock();
4719 return fp;
4720 }
4721
4722 static struct nfs4_file *
find_or_add_file(struct nfs4_file * new,struct svc_fh * fh)4723 find_or_add_file(struct nfs4_file *new, struct svc_fh *fh)
4724 {
4725 struct nfs4_file *fp;
4726 unsigned int hashval = file_hashval(fh);
4727
4728 rcu_read_lock();
4729 fp = find_file_locked(fh, hashval);
4730 rcu_read_unlock();
4731 if (fp)
4732 return fp;
4733
4734 return insert_file(new, fh, hashval);
4735 }
4736
4737 /*
4738 * Called to check deny when READ with all zero stateid or
4739 * WRITE with all zero or all one stateid
4740 */
4741 static __be32
nfs4_share_conflict(struct svc_fh * current_fh,unsigned int deny_type)4742 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4743 {
4744 struct nfs4_file *fp;
4745 __be32 ret = nfs_ok;
4746
4747 fp = find_file(current_fh);
4748 if (!fp)
4749 return ret;
4750 /* Check for conflicting share reservations */
4751 spin_lock(&fp->fi_lock);
4752 if (fp->fi_share_deny & deny_type)
4753 ret = nfserr_locked;
4754 spin_unlock(&fp->fi_lock);
4755 put_nfs4_file(fp);
4756 return ret;
4757 }
4758
nfsd4_deleg_present(const struct inode * inode)4759 static bool nfsd4_deleg_present(const struct inode *inode)
4760 {
4761 struct file_lock_context *ctx = smp_load_acquire(&inode->i_flctx);
4762
4763 return ctx && !list_empty_careful(&ctx->flc_lease);
4764 }
4765
4766 /**
4767 * nfsd_wait_for_delegreturn - wait for delegations to be returned
4768 * @rqstp: the RPC transaction being executed
4769 * @inode: in-core inode of the file being waited for
4770 *
4771 * The timeout prevents deadlock if all nfsd threads happen to be
4772 * tied up waiting for returning delegations.
4773 *
4774 * Return values:
4775 * %true: delegation was returned
4776 * %false: timed out waiting for delegreturn
4777 */
nfsd_wait_for_delegreturn(struct svc_rqst * rqstp,struct inode * inode)4778 bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
4779 {
4780 long __maybe_unused timeo;
4781
4782 timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
4783 NFSD_DELEGRETURN_TIMEOUT);
4784 trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
4785 return timeo > 0;
4786 }
4787
nfsd4_cb_recall_prepare(struct nfsd4_callback * cb)4788 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4789 {
4790 struct nfs4_delegation *dp = cb_to_delegation(cb);
4791 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
4792 nfsd_net_id);
4793
4794 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
4795
4796 /*
4797 * We can't do this in nfsd_break_deleg_cb because it is
4798 * already holding inode->i_lock.
4799 *
4800 * If the dl_time != 0, then we know that it has already been
4801 * queued for a lease break. Don't queue it again.
4802 */
4803 spin_lock(&state_lock);
4804 if (delegation_hashed(dp) && dp->dl_time == 0) {
4805 dp->dl_time = ktime_get_boottime_seconds();
4806 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
4807 }
4808 spin_unlock(&state_lock);
4809 }
4810
nfsd4_cb_recall_done(struct nfsd4_callback * cb,struct rpc_task * task)4811 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4812 struct rpc_task *task)
4813 {
4814 struct nfs4_delegation *dp = cb_to_delegation(cb);
4815
4816 trace_nfsd_cb_recall_done(&dp->dl_stid.sc_stateid, task);
4817
4818 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
4819 dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4820 return 1;
4821
4822 switch (task->tk_status) {
4823 case 0:
4824 return 1;
4825 case -NFS4ERR_DELAY:
4826 rpc_delay(task, 2 * HZ);
4827 return 0;
4828 case -EBADHANDLE:
4829 case -NFS4ERR_BAD_STATEID:
4830 /*
4831 * Race: client probably got cb_recall before open reply
4832 * granting delegation.
4833 */
4834 if (dp->dl_retries--) {
4835 rpc_delay(task, 2 * HZ);
4836 return 0;
4837 }
4838 fallthrough;
4839 default:
4840 return 1;
4841 }
4842 }
4843
nfsd4_cb_recall_release(struct nfsd4_callback * cb)4844 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4845 {
4846 struct nfs4_delegation *dp = cb_to_delegation(cb);
4847
4848 nfs4_put_stid(&dp->dl_stid);
4849 }
4850
4851 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4852 .prepare = nfsd4_cb_recall_prepare,
4853 .done = nfsd4_cb_recall_done,
4854 .release = nfsd4_cb_recall_release,
4855 };
4856
nfsd_break_one_deleg(struct nfs4_delegation * dp)4857 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4858 {
4859 /*
4860 * We're assuming the state code never drops its reference
4861 * without first removing the lease. Since we're in this lease
4862 * callback (and since the lease code is serialized by the
4863 * flc_lock) we know the server hasn't removed the lease yet, and
4864 * we know it's safe to take a reference.
4865 */
4866 refcount_inc(&dp->dl_stid.sc_count);
4867 WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
4868 }
4869
4870 /* Called from break_lease() with flc_lock held. */
4871 static bool
nfsd_break_deleg_cb(struct file_lock * fl)4872 nfsd_break_deleg_cb(struct file_lock *fl)
4873 {
4874 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4875 struct nfs4_file *fp = dp->dl_stid.sc_file;
4876 struct nfs4_client *clp = dp->dl_stid.sc_client;
4877 struct nfsd_net *nn;
4878
4879 trace_nfsd_cb_recall(&dp->dl_stid);
4880
4881 dp->dl_recalled = true;
4882 atomic_inc(&clp->cl_delegs_in_recall);
4883 if (try_to_expire_client(clp)) {
4884 nn = net_generic(clp->net, nfsd_net_id);
4885 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
4886 }
4887
4888 /*
4889 * We don't want the locks code to timeout the lease for us;
4890 * we'll remove it ourself if a delegation isn't returned
4891 * in time:
4892 */
4893 fl->fl_break_time = 0;
4894
4895 spin_lock(&fp->fi_lock);
4896 fp->fi_had_conflict = true;
4897 nfsd_break_one_deleg(dp);
4898 spin_unlock(&fp->fi_lock);
4899 return false;
4900 }
4901
4902 /**
4903 * nfsd_breaker_owns_lease - Check if lease conflict was resolved
4904 * @fl: Lock state to check
4905 *
4906 * Return values:
4907 * %true: Lease conflict was resolved
4908 * %false: Lease conflict was not resolved.
4909 */
nfsd_breaker_owns_lease(struct file_lock * fl)4910 static bool nfsd_breaker_owns_lease(struct file_lock *fl)
4911 {
4912 struct nfs4_delegation *dl = fl->fl_owner;
4913 struct svc_rqst *rqst;
4914 struct nfs4_client *clp;
4915
4916 if (!i_am_nfsd())
4917 return false;
4918 rqst = kthread_data(current);
4919 /* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
4920 if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
4921 return false;
4922 clp = *(rqst->rq_lease_breaker);
4923 return dl->dl_stid.sc_client == clp;
4924 }
4925
4926 static int
nfsd_change_deleg_cb(struct file_lock * onlist,int arg,struct list_head * dispose)4927 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
4928 struct list_head *dispose)
4929 {
4930 struct nfs4_delegation *dp = (struct nfs4_delegation *)onlist->fl_owner;
4931 struct nfs4_client *clp = dp->dl_stid.sc_client;
4932
4933 if (arg & F_UNLCK) {
4934 if (dp->dl_recalled)
4935 atomic_dec(&clp->cl_delegs_in_recall);
4936 return lease_modify(onlist, arg, dispose);
4937 } else
4938 return -EAGAIN;
4939 }
4940
4941 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4942 .lm_breaker_owns_lease = nfsd_breaker_owns_lease,
4943 .lm_break = nfsd_break_deleg_cb,
4944 .lm_change = nfsd_change_deleg_cb,
4945 };
4946
nfsd4_check_seqid(struct nfsd4_compound_state * cstate,struct nfs4_stateowner * so,u32 seqid)4947 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4948 {
4949 if (nfsd4_has_session(cstate))
4950 return nfs_ok;
4951 if (seqid == so->so_seqid - 1)
4952 return nfserr_replay_me;
4953 if (seqid == so->so_seqid)
4954 return nfs_ok;
4955 return nfserr_bad_seqid;
4956 }
4957
lookup_clientid(clientid_t * clid,bool sessions,struct nfsd_net * nn)4958 static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
4959 struct nfsd_net *nn)
4960 {
4961 struct nfs4_client *found;
4962
4963 spin_lock(&nn->client_lock);
4964 found = find_confirmed_client(clid, sessions, nn);
4965 if (found)
4966 atomic_inc(&found->cl_rpc_users);
4967 spin_unlock(&nn->client_lock);
4968 return found;
4969 }
4970
set_client(clientid_t * clid,struct nfsd4_compound_state * cstate,struct nfsd_net * nn)4971 static __be32 set_client(clientid_t *clid,
4972 struct nfsd4_compound_state *cstate,
4973 struct nfsd_net *nn)
4974 {
4975 if (cstate->clp) {
4976 if (!same_clid(&cstate->clp->cl_clientid, clid))
4977 return nfserr_stale_clientid;
4978 return nfs_ok;
4979 }
4980 if (STALE_CLIENTID(clid, nn))
4981 return nfserr_stale_clientid;
4982 /*
4983 * We're in the 4.0 case (otherwise the SEQUENCE op would have
4984 * set cstate->clp), so session = false:
4985 */
4986 cstate->clp = lookup_clientid(clid, false, nn);
4987 if (!cstate->clp)
4988 return nfserr_expired;
4989 return nfs_ok;
4990 }
4991
4992 __be32
nfsd4_process_open1(struct nfsd4_compound_state * cstate,struct nfsd4_open * open,struct nfsd_net * nn)4993 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4994 struct nfsd4_open *open, struct nfsd_net *nn)
4995 {
4996 clientid_t *clientid = &open->op_clientid;
4997 struct nfs4_client *clp = NULL;
4998 unsigned int strhashval;
4999 struct nfs4_openowner *oo = NULL;
5000 __be32 status;
5001
5002 /*
5003 * In case we need it later, after we've already created the
5004 * file and don't want to risk a further failure:
5005 */
5006 open->op_file = nfsd4_alloc_file();
5007 if (open->op_file == NULL)
5008 return nfserr_jukebox;
5009
5010 status = set_client(clientid, cstate, nn);
5011 if (status)
5012 return status;
5013 clp = cstate->clp;
5014
5015 strhashval = ownerstr_hashval(&open->op_owner);
5016 oo = find_openstateowner_str(strhashval, open, clp);
5017 open->op_openowner = oo;
5018 if (!oo) {
5019 goto new_owner;
5020 }
5021 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5022 /* Replace unconfirmed owners without checking for replay. */
5023 release_openowner(oo);
5024 open->op_openowner = NULL;
5025 goto new_owner;
5026 }
5027 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
5028 if (status)
5029 return status;
5030 goto alloc_stateid;
5031 new_owner:
5032 oo = alloc_init_open_stateowner(strhashval, open, cstate);
5033 if (oo == NULL)
5034 return nfserr_jukebox;
5035 open->op_openowner = oo;
5036 alloc_stateid:
5037 open->op_stp = nfs4_alloc_open_stateid(clp);
5038 if (!open->op_stp)
5039 return nfserr_jukebox;
5040
5041 if (nfsd4_has_session(cstate) &&
5042 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5043 open->op_odstate = alloc_clnt_odstate(clp);
5044 if (!open->op_odstate)
5045 return nfserr_jukebox;
5046 }
5047
5048 return nfs_ok;
5049 }
5050
5051 static inline __be32
nfs4_check_delegmode(struct nfs4_delegation * dp,int flags)5052 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5053 {
5054 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
5055 return nfserr_openmode;
5056 else
5057 return nfs_ok;
5058 }
5059
share_access_to_flags(u32 share_access)5060 static int share_access_to_flags(u32 share_access)
5061 {
5062 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5063 }
5064
find_deleg_stateid(struct nfs4_client * cl,stateid_t * s)5065 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
5066 {
5067 struct nfs4_stid *ret;
5068
5069 ret = find_stateid_by_type(cl, s,
5070 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
5071 if (!ret)
5072 return NULL;
5073 return delegstateid(ret);
5074 }
5075
nfsd4_is_deleg_cur(struct nfsd4_open * open)5076 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5077 {
5078 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5079 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5080 }
5081
5082 static __be32
nfs4_check_deleg(struct nfs4_client * cl,struct nfsd4_open * open,struct nfs4_delegation ** dp)5083 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5084 struct nfs4_delegation **dp)
5085 {
5086 int flags;
5087 __be32 status = nfserr_bad_stateid;
5088 struct nfs4_delegation *deleg;
5089
5090 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
5091 if (deleg == NULL)
5092 goto out;
5093 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
5094 nfs4_put_stid(&deleg->dl_stid);
5095 if (cl->cl_minorversion)
5096 status = nfserr_deleg_revoked;
5097 goto out;
5098 }
5099 flags = share_access_to_flags(open->op_share_access);
5100 status = nfs4_check_delegmode(deleg, flags);
5101 if (status) {
5102 nfs4_put_stid(&deleg->dl_stid);
5103 goto out;
5104 }
5105 *dp = deleg;
5106 out:
5107 if (!nfsd4_is_deleg_cur(open))
5108 return nfs_ok;
5109 if (status)
5110 return status;
5111 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5112 return nfs_ok;
5113 }
5114
nfs4_access_to_access(u32 nfs4_access)5115 static inline int nfs4_access_to_access(u32 nfs4_access)
5116 {
5117 int flags = 0;
5118
5119 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5120 flags |= NFSD_MAY_READ;
5121 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5122 flags |= NFSD_MAY_WRITE;
5123 return flags;
5124 }
5125
5126 static inline __be32
nfsd4_truncate(struct svc_rqst * rqstp,struct svc_fh * fh,struct nfsd4_open * open)5127 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5128 struct nfsd4_open *open)
5129 {
5130 struct iattr iattr = {
5131 .ia_valid = ATTR_SIZE,
5132 .ia_size = 0,
5133 };
5134 struct nfsd_attrs attrs = {
5135 .na_iattr = &iattr,
5136 };
5137 if (!open->op_truncate)
5138 return 0;
5139 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5140 return nfserr_inval;
5141 return nfsd_setattr(rqstp, fh, &attrs, 0, (time64_t)0);
5142 }
5143
nfs4_get_vfs_file(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open,bool new_stp)5144 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5145 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5146 struct nfsd4_open *open, bool new_stp)
5147 {
5148 struct nfsd_file *nf = NULL;
5149 __be32 status;
5150 int oflag = nfs4_access_to_omode(open->op_share_access);
5151 int access = nfs4_access_to_access(open->op_share_access);
5152 unsigned char old_access_bmap, old_deny_bmap;
5153
5154 spin_lock(&fp->fi_lock);
5155
5156 /*
5157 * Are we trying to set a deny mode that would conflict with
5158 * current access?
5159 */
5160 status = nfs4_file_check_deny(fp, open->op_share_deny);
5161 if (status != nfs_ok) {
5162 if (status != nfserr_share_denied) {
5163 spin_unlock(&fp->fi_lock);
5164 goto out;
5165 }
5166 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5167 stp, open->op_share_deny, false))
5168 status = nfserr_jukebox;
5169 spin_unlock(&fp->fi_lock);
5170 goto out;
5171 }
5172
5173 /* set access to the file */
5174 status = nfs4_file_get_access(fp, open->op_share_access);
5175 if (status != nfs_ok) {
5176 if (status != nfserr_share_denied) {
5177 spin_unlock(&fp->fi_lock);
5178 goto out;
5179 }
5180 if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5181 stp, open->op_share_access, true))
5182 status = nfserr_jukebox;
5183 spin_unlock(&fp->fi_lock);
5184 goto out;
5185 }
5186
5187 /* Set access bits in stateid */
5188 old_access_bmap = stp->st_access_bmap;
5189 set_access(open->op_share_access, stp);
5190
5191 /* Set new deny mask */
5192 old_deny_bmap = stp->st_deny_bmap;
5193 set_deny(open->op_share_deny, stp);
5194 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5195
5196 if (!fp->fi_fds[oflag]) {
5197 spin_unlock(&fp->fi_lock);
5198
5199 if (!open->op_filp) {
5200 status = nfsd_file_acquire(rqstp, cur_fh, access, &nf);
5201 if (status != nfs_ok)
5202 goto out_put_access;
5203 } else {
5204 status = nfsd_file_create(rqstp, cur_fh, access, &nf);
5205 if (status != nfs_ok)
5206 goto out_put_access;
5207 nf->nf_file = open->op_filp;
5208 open->op_filp = NULL;
5209 trace_nfsd_file_create(rqstp, access, nf);
5210 }
5211
5212 spin_lock(&fp->fi_lock);
5213 if (!fp->fi_fds[oflag]) {
5214 fp->fi_fds[oflag] = nf;
5215 nf = NULL;
5216 }
5217 }
5218 spin_unlock(&fp->fi_lock);
5219 if (nf)
5220 nfsd_file_put(nf);
5221
5222 status = nfserrno(nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5223 access));
5224 if (status)
5225 goto out_put_access;
5226
5227 status = nfsd4_truncate(rqstp, cur_fh, open);
5228 if (status)
5229 goto out_put_access;
5230 out:
5231 return status;
5232 out_put_access:
5233 stp->st_access_bmap = old_access_bmap;
5234 nfs4_file_put_access(fp, open->op_share_access);
5235 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
5236 goto out;
5237 }
5238
5239 static __be32
nfs4_upgrade_open(struct svc_rqst * rqstp,struct nfs4_file * fp,struct svc_fh * cur_fh,struct nfs4_ol_stateid * stp,struct nfsd4_open * open)5240 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5241 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5242 struct nfsd4_open *open)
5243 {
5244 __be32 status;
5245 unsigned char old_deny_bmap = stp->st_deny_bmap;
5246
5247 if (!test_access(open->op_share_access, stp))
5248 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, false);
5249
5250 /* test and set deny mode */
5251 spin_lock(&fp->fi_lock);
5252 status = nfs4_file_check_deny(fp, open->op_share_deny);
5253 if (status == nfs_ok) {
5254 if (status != nfserr_share_denied) {
5255 set_deny(open->op_share_deny, stp);
5256 fp->fi_share_deny |=
5257 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5258 } else {
5259 if (nfs4_resolve_deny_conflicts_locked(fp, false,
5260 stp, open->op_share_deny, false))
5261 status = nfserr_jukebox;
5262 }
5263 }
5264 spin_unlock(&fp->fi_lock);
5265
5266 if (status != nfs_ok)
5267 return status;
5268
5269 status = nfsd4_truncate(rqstp, cur_fh, open);
5270 if (status != nfs_ok)
5271 reset_union_bmap_deny(old_deny_bmap, stp);
5272 return status;
5273 }
5274
5275 /* Should we give out recallable state?: */
nfsd4_cb_channel_good(struct nfs4_client * clp)5276 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5277 {
5278 if (clp->cl_cb_state == NFSD4_CB_UP)
5279 return true;
5280 /*
5281 * In the sessions case, since we don't have to establish a
5282 * separate connection for callbacks, we assume it's OK
5283 * until we hear otherwise:
5284 */
5285 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5286 }
5287
nfs4_alloc_init_lease(struct nfs4_delegation * dp,int flag)5288 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
5289 int flag)
5290 {
5291 struct file_lock *fl;
5292
5293 fl = locks_alloc_lock();
5294 if (!fl)
5295 return NULL;
5296 fl->fl_lmops = &nfsd_lease_mng_ops;
5297 fl->fl_flags = FL_DELEG;
5298 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
5299 fl->fl_end = OFFSET_MAX;
5300 fl->fl_owner = (fl_owner_t)dp;
5301 fl->fl_pid = current->tgid;
5302 fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
5303 return fl;
5304 }
5305
nfsd4_check_conflicting_opens(struct nfs4_client * clp,struct nfs4_file * fp)5306 static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5307 struct nfs4_file *fp)
5308 {
5309 struct nfs4_ol_stateid *st;
5310 struct file *f = fp->fi_deleg_file->nf_file;
5311 struct inode *ino = locks_inode(f);
5312 int writes;
5313
5314 writes = atomic_read(&ino->i_writecount);
5315 if (!writes)
5316 return 0;
5317 /*
5318 * There could be multiple filehandles (hence multiple
5319 * nfs4_files) referencing this file, but that's not too
5320 * common; let's just give up in that case rather than
5321 * trying to go look up all the clients using that other
5322 * nfs4_file as well:
5323 */
5324 if (fp->fi_aliased)
5325 return -EAGAIN;
5326 /*
5327 * If there's a close in progress, make sure that we see it
5328 * clear any fi_fds[] entries before we see it decrement
5329 * i_writecount:
5330 */
5331 smp_mb__after_atomic();
5332
5333 if (fp->fi_fds[O_WRONLY])
5334 writes--;
5335 if (fp->fi_fds[O_RDWR])
5336 writes--;
5337 if (writes > 0)
5338 return -EAGAIN; /* There may be non-NFSv4 writers */
5339 /*
5340 * It's possible there are non-NFSv4 write opens in progress,
5341 * but if they haven't incremented i_writecount yet then they
5342 * also haven't called break lease yet; so, they'll break this
5343 * lease soon enough. So, all that's left to check for is NFSv4
5344 * opens:
5345 */
5346 spin_lock(&fp->fi_lock);
5347 list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5348 if (st->st_openstp == NULL /* it's an open */ &&
5349 access_permit_write(st) &&
5350 st->st_stid.sc_client != clp) {
5351 spin_unlock(&fp->fi_lock);
5352 return -EAGAIN;
5353 }
5354 }
5355 spin_unlock(&fp->fi_lock);
5356 /*
5357 * There's a small chance that we could be racing with another
5358 * NFSv4 open. However, any open that hasn't added itself to
5359 * the fi_stateids list also hasn't called break_lease yet; so,
5360 * they'll break this lease soon enough.
5361 */
5362 return 0;
5363 }
5364
5365 /*
5366 * It's possible that between opening the dentry and setting the delegation,
5367 * that it has been renamed or unlinked. Redo the lookup to verify that this
5368 * hasn't happened.
5369 */
5370 static int
nfsd4_verify_deleg_dentry(struct nfsd4_open * open,struct nfs4_file * fp,struct svc_fh * parent)5371 nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5372 struct svc_fh *parent)
5373 {
5374 struct svc_export *exp;
5375 struct dentry *child;
5376 __be32 err;
5377
5378 err = nfsd_lookup_dentry(open->op_rqstp, parent,
5379 open->op_fname, open->op_fnamelen,
5380 &exp, &child);
5381
5382 if (err)
5383 return -EAGAIN;
5384
5385 exp_put(exp);
5386 dput(child);
5387 if (child != file_dentry(fp->fi_deleg_file->nf_file))
5388 return -EAGAIN;
5389
5390 return 0;
5391 }
5392
5393 static struct nfs4_delegation *
nfs4_set_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * parent)5394 nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5395 struct svc_fh *parent)
5396 {
5397 int status = 0;
5398 struct nfs4_client *clp = stp->st_stid.sc_client;
5399 struct nfs4_file *fp = stp->st_stid.sc_file;
5400 struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5401 struct nfs4_delegation *dp;
5402 struct nfsd_file *nf;
5403 struct file_lock *fl;
5404
5405 /*
5406 * The fi_had_conflict and nfs_get_existing_delegation checks
5407 * here are just optimizations; we'll need to recheck them at
5408 * the end:
5409 */
5410 if (fp->fi_had_conflict)
5411 return ERR_PTR(-EAGAIN);
5412
5413 nf = find_readable_file(fp);
5414 if (!nf) {
5415 /*
5416 * We probably could attempt another open and get a read
5417 * delegation, but for now, don't bother until the
5418 * client actually sends us one.
5419 */
5420 return ERR_PTR(-EAGAIN);
5421 }
5422 spin_lock(&state_lock);
5423 spin_lock(&fp->fi_lock);
5424 if (nfs4_delegation_exists(clp, fp))
5425 status = -EAGAIN;
5426 else if (!fp->fi_deleg_file) {
5427 fp->fi_deleg_file = nf;
5428 /* increment early to prevent fi_deleg_file from being
5429 * cleared */
5430 fp->fi_delegees = 1;
5431 nf = NULL;
5432 } else
5433 fp->fi_delegees++;
5434 spin_unlock(&fp->fi_lock);
5435 spin_unlock(&state_lock);
5436 if (nf)
5437 nfsd_file_put(nf);
5438 if (status)
5439 return ERR_PTR(status);
5440
5441 status = -ENOMEM;
5442 dp = alloc_init_deleg(clp, fp, odstate);
5443 if (!dp)
5444 goto out_delegees;
5445
5446 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
5447 if (!fl)
5448 goto out_clnt_odstate;
5449
5450 status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
5451 if (fl)
5452 locks_free_lock(fl);
5453 if (status)
5454 goto out_clnt_odstate;
5455
5456 if (parent) {
5457 status = nfsd4_verify_deleg_dentry(open, fp, parent);
5458 if (status)
5459 goto out_unlock;
5460 }
5461
5462 status = nfsd4_check_conflicting_opens(clp, fp);
5463 if (status)
5464 goto out_unlock;
5465
5466 spin_lock(&state_lock);
5467 spin_lock(&fp->fi_lock);
5468 if (fp->fi_had_conflict)
5469 status = -EAGAIN;
5470 else
5471 status = hash_delegation_locked(dp, fp);
5472 spin_unlock(&fp->fi_lock);
5473 spin_unlock(&state_lock);
5474
5475 if (status)
5476 goto out_unlock;
5477
5478 return dp;
5479 out_unlock:
5480 vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5481 out_clnt_odstate:
5482 put_clnt_odstate(dp->dl_clnt_odstate);
5483 nfs4_put_stid(&dp->dl_stid);
5484 out_delegees:
5485 put_deleg_file(fp);
5486 return ERR_PTR(status);
5487 }
5488
nfsd4_open_deleg_none_ext(struct nfsd4_open * open,int status)5489 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5490 {
5491 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5492 if (status == -EAGAIN)
5493 open->op_why_no_deleg = WND4_CONTENTION;
5494 else {
5495 open->op_why_no_deleg = WND4_RESOURCE;
5496 switch (open->op_deleg_want) {
5497 case NFS4_SHARE_WANT_READ_DELEG:
5498 case NFS4_SHARE_WANT_WRITE_DELEG:
5499 case NFS4_SHARE_WANT_ANY_DELEG:
5500 break;
5501 case NFS4_SHARE_WANT_CANCEL:
5502 open->op_why_no_deleg = WND4_CANCELLED;
5503 break;
5504 case NFS4_SHARE_WANT_NO_DELEG:
5505 WARN_ON_ONCE(1);
5506 }
5507 }
5508 }
5509
5510 /*
5511 * Attempt to hand out a delegation.
5512 *
5513 * Note we don't support write delegations, and won't until the vfs has
5514 * proper support for them.
5515 */
5516 static void
nfs4_open_delegation(struct nfsd4_open * open,struct nfs4_ol_stateid * stp,struct svc_fh * currentfh)5517 nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5518 struct svc_fh *currentfh)
5519 {
5520 struct nfs4_delegation *dp;
5521 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
5522 struct nfs4_client *clp = stp->st_stid.sc_client;
5523 struct svc_fh *parent = NULL;
5524 int cb_up;
5525 int status = 0;
5526
5527 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
5528 open->op_recall = 0;
5529 switch (open->op_claim_type) {
5530 case NFS4_OPEN_CLAIM_PREVIOUS:
5531 if (!cb_up)
5532 open->op_recall = 1;
5533 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
5534 goto out_no_deleg;
5535 break;
5536 case NFS4_OPEN_CLAIM_NULL:
5537 parent = currentfh;
5538 fallthrough;
5539 case NFS4_OPEN_CLAIM_FH:
5540 /*
5541 * Let's not give out any delegations till everyone's
5542 * had the chance to reclaim theirs, *and* until
5543 * NLM locks have all been reclaimed:
5544 */
5545 if (locks_in_grace(clp->net))
5546 goto out_no_deleg;
5547 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5548 goto out_no_deleg;
5549 break;
5550 default:
5551 goto out_no_deleg;
5552 }
5553 dp = nfs4_set_delegation(open, stp, parent);
5554 if (IS_ERR(dp))
5555 goto out_no_deleg;
5556
5557 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5558
5559 trace_nfsd_deleg_read(&dp->dl_stid.sc_stateid);
5560 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5561 nfs4_put_stid(&dp->dl_stid);
5562 return;
5563 out_no_deleg:
5564 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5565 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5566 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5567 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5568 open->op_recall = 1;
5569 }
5570
5571 /* 4.1 client asking for a delegation? */
5572 if (open->op_deleg_want)
5573 nfsd4_open_deleg_none_ext(open, status);
5574 return;
5575 }
5576
nfsd4_deleg_xgrade_none_ext(struct nfsd4_open * open,struct nfs4_delegation * dp)5577 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5578 struct nfs4_delegation *dp)
5579 {
5580 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5581 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5582 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5583 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
5584 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
5585 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5586 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5587 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
5588 }
5589 /* Otherwise the client must be confused wanting a delegation
5590 * it already has, therefore we don't return
5591 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
5592 */
5593 }
5594
5595 /**
5596 * nfsd4_process_open2 - finish open processing
5597 * @rqstp: the RPC transaction being executed
5598 * @current_fh: NFSv4 COMPOUND's current filehandle
5599 * @open: OPEN arguments
5600 *
5601 * If successful, (1) truncate the file if open->op_truncate was
5602 * set, (2) set open->op_stateid, (3) set open->op_delegation.
5603 *
5604 * Returns %nfs_ok on success; otherwise an nfs4stat value in
5605 * network byte order is returned.
5606 */
5607 __be32
nfsd4_process_open2(struct svc_rqst * rqstp,struct svc_fh * current_fh,struct nfsd4_open * open)5608 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
5609 {
5610 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5611 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
5612 struct nfs4_file *fp = NULL;
5613 struct nfs4_ol_stateid *stp = NULL;
5614 struct nfs4_delegation *dp = NULL;
5615 __be32 status;
5616 bool new_stp = false;
5617
5618 /*
5619 * Lookup file; if found, lookup stateid and check open request,
5620 * and check for delegations in the process of being recalled.
5621 * If not found, create the nfs4_file struct
5622 */
5623 fp = find_or_add_file(open->op_file, current_fh);
5624 if (fp != open->op_file) {
5625 status = nfs4_check_deleg(cl, open, &dp);
5626 if (status)
5627 goto out;
5628 stp = nfsd4_find_and_lock_existing_open(fp, open);
5629 } else {
5630 open->op_file = NULL;
5631 status = nfserr_bad_stateid;
5632 if (nfsd4_is_deleg_cur(open))
5633 goto out;
5634 }
5635
5636 if (!stp) {
5637 stp = init_open_stateid(fp, open);
5638 if (!open->op_stp)
5639 new_stp = true;
5640 }
5641
5642 /*
5643 * OPEN the file, or upgrade an existing OPEN.
5644 * If truncate fails, the OPEN fails.
5645 *
5646 * stp is already locked.
5647 */
5648 if (!new_stp) {
5649 /* Stateid was found, this is an OPEN upgrade */
5650 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
5651 if (status) {
5652 mutex_unlock(&stp->st_mutex);
5653 goto out;
5654 }
5655 } else {
5656 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open, true);
5657 if (status) {
5658 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5659 release_open_stateid(stp);
5660 mutex_unlock(&stp->st_mutex);
5661 goto out;
5662 }
5663
5664 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5665 open->op_odstate);
5666 if (stp->st_clnt_odstate == open->op_odstate)
5667 open->op_odstate = NULL;
5668 }
5669
5670 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
5671 mutex_unlock(&stp->st_mutex);
5672
5673 if (nfsd4_has_session(&resp->cstate)) {
5674 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5675 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5676 open->op_why_no_deleg = WND4_NOT_WANTED;
5677 goto nodeleg;
5678 }
5679 }
5680
5681 /*
5682 * Attempt to hand out a delegation. No error return, because the
5683 * OPEN succeeds even if we fail.
5684 */
5685 nfs4_open_delegation(open, stp, &resp->cstate.current_fh);
5686 nodeleg:
5687 status = nfs_ok;
5688 trace_nfsd_open(&stp->st_stid.sc_stateid);
5689 out:
5690 /* 4.1 client trying to upgrade/downgrade delegation? */
5691 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5692 open->op_deleg_want)
5693 nfsd4_deleg_xgrade_none_ext(open, dp);
5694
5695 if (fp)
5696 put_nfs4_file(fp);
5697 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5698 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5699 /*
5700 * To finish the open response, we just need to set the rflags.
5701 */
5702 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5703 if (nfsd4_has_session(&resp->cstate))
5704 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5705 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5706 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5707
5708 if (dp)
5709 nfs4_put_stid(&dp->dl_stid);
5710 if (stp)
5711 nfs4_put_stid(&stp->st_stid);
5712
5713 return status;
5714 }
5715
nfsd4_cleanup_open_state(struct nfsd4_compound_state * cstate,struct nfsd4_open * open)5716 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5717 struct nfsd4_open *open)
5718 {
5719 if (open->op_openowner) {
5720 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5721
5722 nfsd4_cstate_assign_replay(cstate, so);
5723 nfs4_put_stateowner(so);
5724 }
5725 if (open->op_file)
5726 kmem_cache_free(file_slab, open->op_file);
5727 if (open->op_stp)
5728 nfs4_put_stid(&open->op_stp->st_stid);
5729 if (open->op_odstate)
5730 kmem_cache_free(odstate_slab, open->op_odstate);
5731 }
5732
5733 __be32
nfsd4_renew(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)5734 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5735 union nfsd4_op_u *u)
5736 {
5737 clientid_t *clid = &u->renew;
5738 struct nfs4_client *clp;
5739 __be32 status;
5740 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5741
5742 trace_nfsd_clid_renew(clid);
5743 status = set_client(clid, cstate, nn);
5744 if (status)
5745 return status;
5746 clp = cstate->clp;
5747 if (!list_empty(&clp->cl_delegations)
5748 && clp->cl_cb_state != NFSD4_CB_UP)
5749 return nfserr_cb_path_down;
5750 return nfs_ok;
5751 }
5752
5753 void
nfsd4_end_grace(struct nfsd_net * nn)5754 nfsd4_end_grace(struct nfsd_net *nn)
5755 {
5756 /* do nothing if grace period already ended */
5757 if (nn->grace_ended)
5758 return;
5759
5760 trace_nfsd_grace_complete(nn);
5761 nn->grace_ended = true;
5762 /*
5763 * If the server goes down again right now, an NFSv4
5764 * client will still be allowed to reclaim after it comes back up,
5765 * even if it hasn't yet had a chance to reclaim state this time.
5766 *
5767 */
5768 nfsd4_record_grace_done(nn);
5769 /*
5770 * At this point, NFSv4 clients can still reclaim. But if the
5771 * server crashes, any that have not yet reclaimed will be out
5772 * of luck on the next boot.
5773 *
5774 * (NFSv4.1+ clients are considered to have reclaimed once they
5775 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
5776 * have reclaimed after their first OPEN.)
5777 */
5778 locks_end_grace(&nn->nfsd4_manager);
5779 /*
5780 * At this point, and once lockd and/or any other containers
5781 * exit their grace period, further reclaims will fail and
5782 * regular locking can resume.
5783 */
5784 }
5785
5786 /*
5787 * If we've waited a lease period but there are still clients trying to
5788 * reclaim, wait a little longer to give them a chance to finish.
5789 */
clients_still_reclaiming(struct nfsd_net * nn)5790 static bool clients_still_reclaiming(struct nfsd_net *nn)
5791 {
5792 time64_t double_grace_period_end = nn->boot_time +
5793 2 * nn->nfsd4_lease;
5794
5795 if (nn->track_reclaim_completes &&
5796 atomic_read(&nn->nr_reclaim_complete) ==
5797 nn->reclaim_str_hashtbl_size)
5798 return false;
5799 if (!nn->somebody_reclaimed)
5800 return false;
5801 nn->somebody_reclaimed = false;
5802 /*
5803 * If we've given them *two* lease times to reclaim, and they're
5804 * still not done, give up:
5805 */
5806 if (ktime_get_boottime_seconds() > double_grace_period_end)
5807 return false;
5808 return true;
5809 }
5810
5811 struct laundry_time {
5812 time64_t cutoff;
5813 time64_t new_timeo;
5814 };
5815
state_expired(struct laundry_time * lt,time64_t last_refresh)5816 static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
5817 {
5818 time64_t time_remaining;
5819
5820 if (last_refresh < lt->cutoff)
5821 return true;
5822 time_remaining = last_refresh - lt->cutoff;
5823 lt->new_timeo = min(lt->new_timeo, time_remaining);
5824 return false;
5825 }
5826
5827 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
nfsd4_ssc_init_umount_work(struct nfsd_net * nn)5828 void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
5829 {
5830 spin_lock_init(&nn->nfsd_ssc_lock);
5831 INIT_LIST_HEAD(&nn->nfsd_ssc_mount_list);
5832 init_waitqueue_head(&nn->nfsd_ssc_waitq);
5833 }
5834 EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
5835
5836 /*
5837 * This is called when nfsd is being shutdown, after all inter_ssc
5838 * cleanup were done, to destroy the ssc delayed unmount list.
5839 */
nfsd4_ssc_shutdown_umount(struct nfsd_net * nn)5840 static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
5841 {
5842 struct nfsd4_ssc_umount_item *ni = NULL;
5843 struct nfsd4_ssc_umount_item *tmp;
5844
5845 spin_lock(&nn->nfsd_ssc_lock);
5846 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
5847 list_del(&ni->nsui_list);
5848 spin_unlock(&nn->nfsd_ssc_lock);
5849 mntput(ni->nsui_vfsmount);
5850 kfree(ni);
5851 spin_lock(&nn->nfsd_ssc_lock);
5852 }
5853 spin_unlock(&nn->nfsd_ssc_lock);
5854 }
5855
nfsd4_ssc_expire_umount(struct nfsd_net * nn)5856 static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
5857 {
5858 bool do_wakeup = false;
5859 struct nfsd4_ssc_umount_item *ni = NULL;
5860 struct nfsd4_ssc_umount_item *tmp;
5861
5862 spin_lock(&nn->nfsd_ssc_lock);
5863 list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
5864 if (time_after(jiffies, ni->nsui_expire)) {
5865 if (refcount_read(&ni->nsui_refcnt) > 1)
5866 continue;
5867
5868 /* mark being unmount */
5869 ni->nsui_busy = true;
5870 spin_unlock(&nn->nfsd_ssc_lock);
5871 mntput(ni->nsui_vfsmount);
5872 spin_lock(&nn->nfsd_ssc_lock);
5873
5874 /* waiters need to start from begin of list */
5875 list_del(&ni->nsui_list);
5876 kfree(ni);
5877
5878 /* wakeup ssc_connect waiters */
5879 do_wakeup = true;
5880 continue;
5881 }
5882 break;
5883 }
5884 if (do_wakeup)
5885 wake_up_all(&nn->nfsd_ssc_waitq);
5886 spin_unlock(&nn->nfsd_ssc_lock);
5887 }
5888 #endif
5889
5890 /* Check if any lock belonging to this lockowner has any blockers */
5891 static bool
nfs4_lockowner_has_blockers(struct nfs4_lockowner * lo)5892 nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
5893 {
5894 struct file_lock_context *ctx;
5895 struct nfs4_ol_stateid *stp;
5896 struct nfs4_file *nf;
5897
5898 list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
5899 nf = stp->st_stid.sc_file;
5900 ctx = nf->fi_inode->i_flctx;
5901 if (!ctx)
5902 continue;
5903 if (locks_owner_has_blockers(ctx, lo))
5904 return true;
5905 }
5906 return false;
5907 }
5908
5909 static bool
nfs4_anylock_blockers(struct nfs4_client * clp)5910 nfs4_anylock_blockers(struct nfs4_client *clp)
5911 {
5912 int i;
5913 struct nfs4_stateowner *so;
5914 struct nfs4_lockowner *lo;
5915
5916 if (atomic_read(&clp->cl_delegs_in_recall))
5917 return true;
5918 spin_lock(&clp->cl_lock);
5919 for (i = 0; i < OWNER_HASH_SIZE; i++) {
5920 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
5921 so_strhash) {
5922 if (so->so_is_open_owner)
5923 continue;
5924 lo = lockowner(so);
5925 if (nfs4_lockowner_has_blockers(lo)) {
5926 spin_unlock(&clp->cl_lock);
5927 return true;
5928 }
5929 }
5930 }
5931 spin_unlock(&clp->cl_lock);
5932 return false;
5933 }
5934
5935 static void
nfs4_get_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist,struct laundry_time * lt)5936 nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
5937 struct laundry_time *lt)
5938 {
5939 unsigned int maxreap, reapcnt = 0;
5940 struct list_head *pos, *next;
5941 struct nfs4_client *clp;
5942
5943 maxreap = (atomic_read(&nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
5944 NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
5945 INIT_LIST_HEAD(reaplist);
5946 spin_lock(&nn->client_lock);
5947 list_for_each_safe(pos, next, &nn->client_lru) {
5948 clp = list_entry(pos, struct nfs4_client, cl_lru);
5949 if (clp->cl_state == NFSD4_EXPIRABLE)
5950 goto exp_client;
5951 if (!state_expired(lt, clp->cl_time))
5952 break;
5953 if (!atomic_read(&clp->cl_rpc_users)) {
5954 if (clp->cl_state == NFSD4_ACTIVE)
5955 atomic_inc(&nn->nfsd_courtesy_clients);
5956 clp->cl_state = NFSD4_COURTESY;
5957 }
5958 if (!client_has_state(clp))
5959 goto exp_client;
5960 if (!nfs4_anylock_blockers(clp))
5961 if (reapcnt >= maxreap)
5962 continue;
5963 exp_client:
5964 if (!mark_client_expired_locked(clp)) {
5965 list_add(&clp->cl_lru, reaplist);
5966 reapcnt++;
5967 }
5968 }
5969 spin_unlock(&nn->client_lock);
5970 }
5971
5972 static void
nfs4_get_courtesy_client_reaplist(struct nfsd_net * nn,struct list_head * reaplist)5973 nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
5974 struct list_head *reaplist)
5975 {
5976 unsigned int maxreap = 0, reapcnt = 0;
5977 struct list_head *pos, *next;
5978 struct nfs4_client *clp;
5979
5980 maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
5981 INIT_LIST_HEAD(reaplist);
5982
5983 spin_lock(&nn->client_lock);
5984 list_for_each_safe(pos, next, &nn->client_lru) {
5985 clp = list_entry(pos, struct nfs4_client, cl_lru);
5986 if (clp->cl_state == NFSD4_ACTIVE)
5987 break;
5988 if (reapcnt >= maxreap)
5989 break;
5990 if (!mark_client_expired_locked(clp)) {
5991 list_add(&clp->cl_lru, reaplist);
5992 reapcnt++;
5993 }
5994 }
5995 spin_unlock(&nn->client_lock);
5996 }
5997
5998 static void
nfs4_process_client_reaplist(struct list_head * reaplist)5999 nfs4_process_client_reaplist(struct list_head *reaplist)
6000 {
6001 struct list_head *pos, *next;
6002 struct nfs4_client *clp;
6003
6004 list_for_each_safe(pos, next, reaplist) {
6005 clp = list_entry(pos, struct nfs4_client, cl_lru);
6006 trace_nfsd_clid_purged(&clp->cl_clientid);
6007 list_del_init(&clp->cl_lru);
6008 expire_client(clp);
6009 }
6010 }
6011
6012 static time64_t
nfs4_laundromat(struct nfsd_net * nn)6013 nfs4_laundromat(struct nfsd_net *nn)
6014 {
6015 struct nfs4_openowner *oo;
6016 struct nfs4_delegation *dp;
6017 struct nfs4_ol_stateid *stp;
6018 struct nfsd4_blocked_lock *nbl;
6019 struct list_head *pos, *next, reaplist;
6020 struct laundry_time lt = {
6021 .cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6022 .new_timeo = nn->nfsd4_lease
6023 };
6024 struct nfs4_cpntf_state *cps;
6025 copy_stateid_t *cps_t;
6026 int i;
6027
6028 if (clients_still_reclaiming(nn)) {
6029 lt.new_timeo = 0;
6030 goto out;
6031 }
6032 nfsd4_end_grace(nn);
6033
6034 spin_lock(&nn->s2s_cp_lock);
6035 idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6036 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6037 if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6038 state_expired(<, cps->cpntf_time))
6039 _free_cpntf_state_locked(nn, cps);
6040 }
6041 spin_unlock(&nn->s2s_cp_lock);
6042 nfs4_get_client_reaplist(nn, &reaplist, <);
6043 nfs4_process_client_reaplist(&reaplist);
6044
6045 spin_lock(&state_lock);
6046 list_for_each_safe(pos, next, &nn->del_recall_lru) {
6047 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6048 if (!state_expired(<, dp->dl_time))
6049 break;
6050 WARN_ON(!unhash_delegation_locked(dp));
6051 list_add(&dp->dl_recall_lru, &reaplist);
6052 }
6053 spin_unlock(&state_lock);
6054 while (!list_empty(&reaplist)) {
6055 dp = list_first_entry(&reaplist, struct nfs4_delegation,
6056 dl_recall_lru);
6057 list_del_init(&dp->dl_recall_lru);
6058 revoke_delegation(dp);
6059 }
6060
6061 spin_lock(&nn->client_lock);
6062 while (!list_empty(&nn->close_lru)) {
6063 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6064 oo_close_lru);
6065 if (!state_expired(<, oo->oo_time))
6066 break;
6067 list_del_init(&oo->oo_close_lru);
6068 stp = oo->oo_last_closed_stid;
6069 oo->oo_last_closed_stid = NULL;
6070 spin_unlock(&nn->client_lock);
6071 nfs4_put_stid(&stp->st_stid);
6072 spin_lock(&nn->client_lock);
6073 }
6074 spin_unlock(&nn->client_lock);
6075
6076 /*
6077 * It's possible for a client to try and acquire an already held lock
6078 * that is being held for a long time, and then lose interest in it.
6079 * So, we clean out any un-revisited request after a lease period
6080 * under the assumption that the client is no longer interested.
6081 *
6082 * RFC5661, sec. 9.6 states that the client must not rely on getting
6083 * notifications and must continue to poll for locks, even when the
6084 * server supports them. Thus this shouldn't lead to clients blocking
6085 * indefinitely once the lock does become free.
6086 */
6087 BUG_ON(!list_empty(&reaplist));
6088 spin_lock(&nn->blocked_locks_lock);
6089 while (!list_empty(&nn->blocked_locks_lru)) {
6090 nbl = list_first_entry(&nn->blocked_locks_lru,
6091 struct nfsd4_blocked_lock, nbl_lru);
6092 if (!state_expired(<, nbl->nbl_time))
6093 break;
6094 list_move(&nbl->nbl_lru, &reaplist);
6095 list_del_init(&nbl->nbl_list);
6096 }
6097 spin_unlock(&nn->blocked_locks_lock);
6098
6099 while (!list_empty(&reaplist)) {
6100 nbl = list_first_entry(&reaplist,
6101 struct nfsd4_blocked_lock, nbl_lru);
6102 list_del_init(&nbl->nbl_lru);
6103 free_blocked_lock(nbl);
6104 }
6105 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
6106 /* service the server-to-server copy delayed unmount list */
6107 nfsd4_ssc_expire_umount(nn);
6108 #endif
6109 out:
6110 return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6111 }
6112
6113 static void laundromat_main(struct work_struct *);
6114
6115 static void
laundromat_main(struct work_struct * laundry)6116 laundromat_main(struct work_struct *laundry)
6117 {
6118 time64_t t;
6119 struct delayed_work *dwork = to_delayed_work(laundry);
6120 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6121 laundromat_work);
6122
6123 t = nfs4_laundromat(nn);
6124 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
6125 }
6126
6127 static void
courtesy_client_reaper(struct work_struct * reaper)6128 courtesy_client_reaper(struct work_struct *reaper)
6129 {
6130 struct list_head reaplist;
6131 struct delayed_work *dwork = to_delayed_work(reaper);
6132 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6133 nfsd_shrinker_work);
6134
6135 nfs4_get_courtesy_client_reaplist(nn, &reaplist);
6136 nfs4_process_client_reaplist(&reaplist);
6137 }
6138
nfs4_check_fh(struct svc_fh * fhp,struct nfs4_stid * stp)6139 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
6140 {
6141 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
6142 return nfserr_bad_stateid;
6143 return nfs_ok;
6144 }
6145
6146 static
nfs4_check_openmode(struct nfs4_ol_stateid * stp,int flags)6147 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6148 {
6149 __be32 status = nfserr_openmode;
6150
6151 /* For lock stateid's, we test the parent open, not the lock: */
6152 if (stp->st_openstp)
6153 stp = stp->st_openstp;
6154 if ((flags & WR_STATE) && !access_permit_write(stp))
6155 goto out;
6156 if ((flags & RD_STATE) && !access_permit_read(stp))
6157 goto out;
6158 status = nfs_ok;
6159 out:
6160 return status;
6161 }
6162
6163 static inline __be32
check_special_stateids(struct net * net,svc_fh * current_fh,stateid_t * stateid,int flags)6164 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6165 {
6166 if (ONE_STATEID(stateid) && (flags & RD_STATE))
6167 return nfs_ok;
6168 else if (opens_in_grace(net)) {
6169 /* Answer in remaining cases depends on existence of
6170 * conflicting state; so we must wait out the grace period. */
6171 return nfserr_grace;
6172 } else if (flags & WR_STATE)
6173 return nfs4_share_conflict(current_fh,
6174 NFS4_SHARE_DENY_WRITE);
6175 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6176 return nfs4_share_conflict(current_fh,
6177 NFS4_SHARE_DENY_READ);
6178 }
6179
check_stateid_generation(stateid_t * in,stateid_t * ref,bool has_session)6180 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6181 {
6182 /*
6183 * When sessions are used the stateid generation number is ignored
6184 * when it is zero.
6185 */
6186 if (has_session && in->si_generation == 0)
6187 return nfs_ok;
6188
6189 if (in->si_generation == ref->si_generation)
6190 return nfs_ok;
6191
6192 /* If the client sends us a stateid from the future, it's buggy: */
6193 if (nfsd4_stateid_generation_after(in, ref))
6194 return nfserr_bad_stateid;
6195 /*
6196 * However, we could see a stateid from the past, even from a
6197 * non-buggy client. For example, if the client sends a lock
6198 * while some IO is outstanding, the lock may bump si_generation
6199 * while the IO is still in flight. The client could avoid that
6200 * situation by waiting for responses on all the IO requests,
6201 * but better performance may result in retrying IO that
6202 * receives an old_stateid error if requests are rarely
6203 * reordered in flight:
6204 */
6205 return nfserr_old_stateid;
6206 }
6207
nfsd4_stid_check_stateid_generation(stateid_t * in,struct nfs4_stid * s,bool has_session)6208 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6209 {
6210 __be32 ret;
6211
6212 spin_lock(&s->sc_lock);
6213 ret = nfsd4_verify_open_stid(s);
6214 if (ret == nfs_ok)
6215 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
6216 spin_unlock(&s->sc_lock);
6217 return ret;
6218 }
6219
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid * ols)6220 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6221 {
6222 if (ols->st_stateowner->so_is_open_owner &&
6223 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6224 return nfserr_bad_stateid;
6225 return nfs_ok;
6226 }
6227
nfsd4_validate_stateid(struct nfs4_client * cl,stateid_t * stateid)6228 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6229 {
6230 struct nfs4_stid *s;
6231 __be32 status = nfserr_bad_stateid;
6232
6233 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6234 CLOSE_STATEID(stateid))
6235 return status;
6236 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid))
6237 return status;
6238 spin_lock(&cl->cl_lock);
6239 s = find_stateid_locked(cl, stateid);
6240 if (!s)
6241 goto out_unlock;
6242 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
6243 if (status)
6244 goto out_unlock;
6245 switch (s->sc_type) {
6246 case NFS4_DELEG_STID:
6247 status = nfs_ok;
6248 break;
6249 case NFS4_REVOKED_DELEG_STID:
6250 status = nfserr_deleg_revoked;
6251 break;
6252 case NFS4_OPEN_STID:
6253 case NFS4_LOCK_STID:
6254 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
6255 break;
6256 default:
6257 printk("unknown stateid type %x\n", s->sc_type);
6258 fallthrough;
6259 case NFS4_CLOSED_STID:
6260 case NFS4_CLOSED_DELEG_STID:
6261 status = nfserr_bad_stateid;
6262 }
6263 out_unlock:
6264 spin_unlock(&cl->cl_lock);
6265 return status;
6266 }
6267
6268 __be32
nfsd4_lookup_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid,unsigned char typemask,struct nfs4_stid ** s,struct nfsd_net * nn)6269 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
6270 stateid_t *stateid, unsigned char typemask,
6271 struct nfs4_stid **s, struct nfsd_net *nn)
6272 {
6273 __be32 status;
6274 struct nfs4_stid *stid;
6275 bool return_revoked = false;
6276
6277 /*
6278 * only return revoked delegations if explicitly asked.
6279 * otherwise we report revoked or bad_stateid status.
6280 */
6281 if (typemask & NFS4_REVOKED_DELEG_STID)
6282 return_revoked = true;
6283 else if (typemask & NFS4_DELEG_STID)
6284 typemask |= NFS4_REVOKED_DELEG_STID;
6285
6286 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6287 CLOSE_STATEID(stateid))
6288 return nfserr_bad_stateid;
6289 status = set_client(&stateid->si_opaque.so_clid, cstate, nn);
6290 if (status == nfserr_stale_clientid) {
6291 if (cstate->session)
6292 return nfserr_bad_stateid;
6293 return nfserr_stale_stateid;
6294 }
6295 if (status)
6296 return status;
6297 stid = find_stateid_by_type(cstate->clp, stateid, typemask);
6298 if (!stid)
6299 return nfserr_bad_stateid;
6300 if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
6301 nfs4_put_stid(stid);
6302 if (cstate->minorversion)
6303 return nfserr_deleg_revoked;
6304 return nfserr_bad_stateid;
6305 }
6306 *s = stid;
6307 return nfs_ok;
6308 }
6309
6310 static struct nfsd_file *
nfs4_find_file(struct nfs4_stid * s,int flags)6311 nfs4_find_file(struct nfs4_stid *s, int flags)
6312 {
6313 if (!s)
6314 return NULL;
6315
6316 switch (s->sc_type) {
6317 case NFS4_DELEG_STID:
6318 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
6319 return NULL;
6320 return nfsd_file_get(s->sc_file->fi_deleg_file);
6321 case NFS4_OPEN_STID:
6322 case NFS4_LOCK_STID:
6323 if (flags & RD_STATE)
6324 return find_readable_file(s->sc_file);
6325 else
6326 return find_writeable_file(s->sc_file);
6327 }
6328
6329 return NULL;
6330 }
6331
6332 static __be32
nfs4_check_olstateid(struct nfs4_ol_stateid * ols,int flags)6333 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
6334 {
6335 __be32 status;
6336
6337 status = nfsd4_check_openowner_confirmed(ols);
6338 if (status)
6339 return status;
6340 return nfs4_check_openmode(ols, flags);
6341 }
6342
6343 static __be32
nfs4_check_file(struct svc_rqst * rqstp,struct svc_fh * fhp,struct nfs4_stid * s,struct nfsd_file ** nfp,int flags)6344 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
6345 struct nfsd_file **nfp, int flags)
6346 {
6347 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
6348 struct nfsd_file *nf;
6349 __be32 status;
6350
6351 nf = nfs4_find_file(s, flags);
6352 if (nf) {
6353 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
6354 acc | NFSD_MAY_OWNER_OVERRIDE);
6355 if (status) {
6356 nfsd_file_put(nf);
6357 goto out;
6358 }
6359 } else {
6360 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
6361 if (status)
6362 return status;
6363 }
6364 *nfp = nf;
6365 out:
6366 return status;
6367 }
6368 static void
_free_cpntf_state_locked(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)6369 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6370 {
6371 WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
6372 if (!refcount_dec_and_test(&cps->cp_stateid.cs_count))
6373 return;
6374 list_del(&cps->cp_list);
6375 idr_remove(&nn->s2s_cp_stateids,
6376 cps->cp_stateid.cs_stid.si_opaque.so_id);
6377 kfree(cps);
6378 }
6379 /*
6380 * A READ from an inter server to server COPY will have a
6381 * copy stateid. Look up the copy notify stateid from the
6382 * idr structure and take a reference on it.
6383 */
manage_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_client * clp,struct nfs4_cpntf_state ** cps)6384 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6385 struct nfs4_client *clp,
6386 struct nfs4_cpntf_state **cps)
6387 {
6388 copy_stateid_t *cps_t;
6389 struct nfs4_cpntf_state *state = NULL;
6390
6391 if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
6392 return nfserr_bad_stateid;
6393 spin_lock(&nn->s2s_cp_lock);
6394 cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
6395 if (cps_t) {
6396 state = container_of(cps_t, struct nfs4_cpntf_state,
6397 cp_stateid);
6398 if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
6399 state = NULL;
6400 goto unlock;
6401 }
6402 if (!clp)
6403 refcount_inc(&state->cp_stateid.cs_count);
6404 else
6405 _free_cpntf_state_locked(nn, state);
6406 }
6407 unlock:
6408 spin_unlock(&nn->s2s_cp_lock);
6409 if (!state)
6410 return nfserr_bad_stateid;
6411 if (!clp && state)
6412 *cps = state;
6413 return 0;
6414 }
6415
find_cpntf_state(struct nfsd_net * nn,stateid_t * st,struct nfs4_stid ** stid)6416 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6417 struct nfs4_stid **stid)
6418 {
6419 __be32 status;
6420 struct nfs4_cpntf_state *cps = NULL;
6421 struct nfs4_client *found;
6422
6423 status = manage_cpntf_state(nn, st, NULL, &cps);
6424 if (status)
6425 return status;
6426
6427 cps->cpntf_time = ktime_get_boottime_seconds();
6428
6429 status = nfserr_expired;
6430 found = lookup_clientid(&cps->cp_p_clid, true, nn);
6431 if (!found)
6432 goto out;
6433
6434 *stid = find_stateid_by_type(found, &cps->cp_p_stateid,
6435 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
6436 if (*stid)
6437 status = nfs_ok;
6438 else
6439 status = nfserr_bad_stateid;
6440
6441 put_client_renew(found);
6442 out:
6443 nfs4_put_cpntf_state(nn, cps);
6444 return status;
6445 }
6446
nfs4_put_cpntf_state(struct nfsd_net * nn,struct nfs4_cpntf_state * cps)6447 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6448 {
6449 spin_lock(&nn->s2s_cp_lock);
6450 _free_cpntf_state_locked(nn, cps);
6451 spin_unlock(&nn->s2s_cp_lock);
6452 }
6453
6454 /*
6455 * Checks for stateid operations
6456 */
6457 __be32
nfs4_preprocess_stateid_op(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct svc_fh * fhp,stateid_t * stateid,int flags,struct nfsd_file ** nfp,struct nfs4_stid ** cstid)6458 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
6459 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
6460 stateid_t *stateid, int flags, struct nfsd_file **nfp,
6461 struct nfs4_stid **cstid)
6462 {
6463 struct net *net = SVC_NET(rqstp);
6464 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6465 struct nfs4_stid *s = NULL;
6466 __be32 status;
6467
6468 if (nfp)
6469 *nfp = NULL;
6470
6471 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
6472 if (cstid)
6473 status = nfserr_bad_stateid;
6474 else
6475 status = check_special_stateids(net, fhp, stateid,
6476 flags);
6477 goto done;
6478 }
6479
6480 status = nfsd4_lookup_stateid(cstate, stateid,
6481 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
6482 &s, nn);
6483 if (status == nfserr_bad_stateid)
6484 status = find_cpntf_state(nn, stateid, &s);
6485 if (status)
6486 return status;
6487 status = nfsd4_stid_check_stateid_generation(stateid, s,
6488 nfsd4_has_session(cstate));
6489 if (status)
6490 goto out;
6491
6492 switch (s->sc_type) {
6493 case NFS4_DELEG_STID:
6494 status = nfs4_check_delegmode(delegstateid(s), flags);
6495 break;
6496 case NFS4_OPEN_STID:
6497 case NFS4_LOCK_STID:
6498 status = nfs4_check_olstateid(openlockstateid(s), flags);
6499 break;
6500 default:
6501 status = nfserr_bad_stateid;
6502 break;
6503 }
6504 if (status)
6505 goto out;
6506 status = nfs4_check_fh(fhp, s);
6507
6508 done:
6509 if (status == nfs_ok && nfp)
6510 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
6511 out:
6512 if (s) {
6513 if (!status && cstid)
6514 *cstid = s;
6515 else
6516 nfs4_put_stid(s);
6517 }
6518 return status;
6519 }
6520
6521 /*
6522 * Test if the stateid is valid
6523 */
6524 __be32
nfsd4_test_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6525 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6526 union nfsd4_op_u *u)
6527 {
6528 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
6529 struct nfsd4_test_stateid_id *stateid;
6530 struct nfs4_client *cl = cstate->clp;
6531
6532 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
6533 stateid->ts_id_status =
6534 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
6535
6536 return nfs_ok;
6537 }
6538
6539 static __be32
nfsd4_free_lock_stateid(stateid_t * stateid,struct nfs4_stid * s)6540 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
6541 {
6542 struct nfs4_ol_stateid *stp = openlockstateid(s);
6543 __be32 ret;
6544
6545 ret = nfsd4_lock_ol_stateid(stp);
6546 if (ret)
6547 goto out_put_stid;
6548
6549 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6550 if (ret)
6551 goto out;
6552
6553 ret = nfserr_locks_held;
6554 if (check_for_locks(stp->st_stid.sc_file,
6555 lockowner(stp->st_stateowner)))
6556 goto out;
6557
6558 release_lock_stateid(stp);
6559 ret = nfs_ok;
6560
6561 out:
6562 mutex_unlock(&stp->st_mutex);
6563 out_put_stid:
6564 nfs4_put_stid(s);
6565 return ret;
6566 }
6567
6568 __be32
nfsd4_free_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6569 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6570 union nfsd4_op_u *u)
6571 {
6572 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
6573 stateid_t *stateid = &free_stateid->fr_stateid;
6574 struct nfs4_stid *s;
6575 struct nfs4_delegation *dp;
6576 struct nfs4_client *cl = cstate->clp;
6577 __be32 ret = nfserr_bad_stateid;
6578
6579 spin_lock(&cl->cl_lock);
6580 s = find_stateid_locked(cl, stateid);
6581 if (!s)
6582 goto out_unlock;
6583 spin_lock(&s->sc_lock);
6584 switch (s->sc_type) {
6585 case NFS4_DELEG_STID:
6586 ret = nfserr_locks_held;
6587 break;
6588 case NFS4_OPEN_STID:
6589 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
6590 if (ret)
6591 break;
6592 ret = nfserr_locks_held;
6593 break;
6594 case NFS4_LOCK_STID:
6595 spin_unlock(&s->sc_lock);
6596 refcount_inc(&s->sc_count);
6597 spin_unlock(&cl->cl_lock);
6598 ret = nfsd4_free_lock_stateid(stateid, s);
6599 goto out;
6600 case NFS4_REVOKED_DELEG_STID:
6601 spin_unlock(&s->sc_lock);
6602 dp = delegstateid(s);
6603 list_del_init(&dp->dl_recall_lru);
6604 spin_unlock(&cl->cl_lock);
6605 nfs4_put_stid(s);
6606 ret = nfs_ok;
6607 goto out;
6608 /* Default falls through and returns nfserr_bad_stateid */
6609 }
6610 spin_unlock(&s->sc_lock);
6611 out_unlock:
6612 spin_unlock(&cl->cl_lock);
6613 out:
6614 return ret;
6615 }
6616
6617 static inline int
setlkflg(int type)6618 setlkflg (int type)
6619 {
6620 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
6621 RD_STATE : WR_STATE;
6622 }
6623
nfs4_seqid_op_checks(struct nfsd4_compound_state * cstate,stateid_t * stateid,u32 seqid,struct nfs4_ol_stateid * stp)6624 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
6625 {
6626 struct svc_fh *current_fh = &cstate->current_fh;
6627 struct nfs4_stateowner *sop = stp->st_stateowner;
6628 __be32 status;
6629
6630 status = nfsd4_check_seqid(cstate, sop, seqid);
6631 if (status)
6632 return status;
6633 status = nfsd4_lock_ol_stateid(stp);
6634 if (status != nfs_ok)
6635 return status;
6636 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
6637 if (status == nfs_ok)
6638 status = nfs4_check_fh(current_fh, &stp->st_stid);
6639 if (status != nfs_ok)
6640 mutex_unlock(&stp->st_mutex);
6641 return status;
6642 }
6643
6644 /*
6645 * Checks for sequence id mutating operations.
6646 */
6647 static __be32
nfs4_preprocess_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,char typemask,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)6648 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6649 stateid_t *stateid, char typemask,
6650 struct nfs4_ol_stateid **stpp,
6651 struct nfsd_net *nn)
6652 {
6653 __be32 status;
6654 struct nfs4_stid *s;
6655 struct nfs4_ol_stateid *stp = NULL;
6656
6657 trace_nfsd_preprocess(seqid, stateid);
6658
6659 *stpp = NULL;
6660 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
6661 if (status)
6662 return status;
6663 stp = openlockstateid(s);
6664 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
6665
6666 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
6667 if (!status)
6668 *stpp = stp;
6669 else
6670 nfs4_put_stid(&stp->st_stid);
6671 return status;
6672 }
6673
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state * cstate,u32 seqid,stateid_t * stateid,struct nfs4_ol_stateid ** stpp,struct nfsd_net * nn)6674 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6675 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
6676 {
6677 __be32 status;
6678 struct nfs4_openowner *oo;
6679 struct nfs4_ol_stateid *stp;
6680
6681 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
6682 NFS4_OPEN_STID, &stp, nn);
6683 if (status)
6684 return status;
6685 oo = openowner(stp->st_stateowner);
6686 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
6687 mutex_unlock(&stp->st_mutex);
6688 nfs4_put_stid(&stp->st_stid);
6689 return nfserr_bad_stateid;
6690 }
6691 *stpp = stp;
6692 return nfs_ok;
6693 }
6694
6695 __be32
nfsd4_open_confirm(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6696 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6697 union nfsd4_op_u *u)
6698 {
6699 struct nfsd4_open_confirm *oc = &u->open_confirm;
6700 __be32 status;
6701 struct nfs4_openowner *oo;
6702 struct nfs4_ol_stateid *stp;
6703 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6704
6705 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
6706 cstate->current_fh.fh_dentry);
6707
6708 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
6709 if (status)
6710 return status;
6711
6712 status = nfs4_preprocess_seqid_op(cstate,
6713 oc->oc_seqid, &oc->oc_req_stateid,
6714 NFS4_OPEN_STID, &stp, nn);
6715 if (status)
6716 goto out;
6717 oo = openowner(stp->st_stateowner);
6718 status = nfserr_bad_stateid;
6719 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
6720 mutex_unlock(&stp->st_mutex);
6721 goto put_stateid;
6722 }
6723 oo->oo_flags |= NFS4_OO_CONFIRMED;
6724 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
6725 mutex_unlock(&stp->st_mutex);
6726 trace_nfsd_open_confirm(oc->oc_seqid, &stp->st_stid.sc_stateid);
6727 nfsd4_client_record_create(oo->oo_owner.so_client);
6728 status = nfs_ok;
6729 put_stateid:
6730 nfs4_put_stid(&stp->st_stid);
6731 out:
6732 nfsd4_bump_seqid(cstate, status);
6733 return status;
6734 }
6735
nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid * stp,u32 access)6736 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
6737 {
6738 if (!test_access(access, stp))
6739 return;
6740 nfs4_file_put_access(stp->st_stid.sc_file, access);
6741 clear_access(access, stp);
6742 }
6743
nfs4_stateid_downgrade(struct nfs4_ol_stateid * stp,u32 to_access)6744 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
6745 {
6746 switch (to_access) {
6747 case NFS4_SHARE_ACCESS_READ:
6748 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
6749 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6750 break;
6751 case NFS4_SHARE_ACCESS_WRITE:
6752 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
6753 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6754 break;
6755 case NFS4_SHARE_ACCESS_BOTH:
6756 break;
6757 default:
6758 WARN_ON_ONCE(1);
6759 }
6760 }
6761
6762 __be32
nfsd4_open_downgrade(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6763 nfsd4_open_downgrade(struct svc_rqst *rqstp,
6764 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
6765 {
6766 struct nfsd4_open_downgrade *od = &u->open_downgrade;
6767 __be32 status;
6768 struct nfs4_ol_stateid *stp;
6769 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6770
6771 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
6772 cstate->current_fh.fh_dentry);
6773
6774 /* We don't yet support WANT bits: */
6775 if (od->od_deleg_want)
6776 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
6777 od->od_deleg_want);
6778
6779 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
6780 &od->od_stateid, &stp, nn);
6781 if (status)
6782 goto out;
6783 status = nfserr_inval;
6784 if (!test_access(od->od_share_access, stp)) {
6785 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
6786 stp->st_access_bmap, od->od_share_access);
6787 goto put_stateid;
6788 }
6789 if (!test_deny(od->od_share_deny, stp)) {
6790 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
6791 stp->st_deny_bmap, od->od_share_deny);
6792 goto put_stateid;
6793 }
6794 nfs4_stateid_downgrade(stp, od->od_share_access);
6795 reset_union_bmap_deny(od->od_share_deny, stp);
6796 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
6797 status = nfs_ok;
6798 put_stateid:
6799 mutex_unlock(&stp->st_mutex);
6800 nfs4_put_stid(&stp->st_stid);
6801 out:
6802 nfsd4_bump_seqid(cstate, status);
6803 return status;
6804 }
6805
nfsd4_close_open_stateid(struct nfs4_ol_stateid * s)6806 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
6807 {
6808 struct nfs4_client *clp = s->st_stid.sc_client;
6809 bool unhashed;
6810 LIST_HEAD(reaplist);
6811 struct nfs4_ol_stateid *stp;
6812
6813 spin_lock(&clp->cl_lock);
6814 unhashed = unhash_open_stateid(s, &reaplist);
6815
6816 if (clp->cl_minorversion) {
6817 if (unhashed)
6818 put_ol_stateid_locked(s, &reaplist);
6819 spin_unlock(&clp->cl_lock);
6820 list_for_each_entry(stp, &reaplist, st_locks)
6821 nfs4_free_cpntf_statelist(clp->net, &stp->st_stid);
6822 free_ol_stateid_reaplist(&reaplist);
6823 } else {
6824 spin_unlock(&clp->cl_lock);
6825 free_ol_stateid_reaplist(&reaplist);
6826 if (unhashed)
6827 move_to_close_lru(s, clp->net);
6828 }
6829 }
6830
6831 /*
6832 * nfs4_unlock_state() called after encode
6833 */
6834 __be32
nfsd4_close(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6835 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6836 union nfsd4_op_u *u)
6837 {
6838 struct nfsd4_close *close = &u->close;
6839 __be32 status;
6840 struct nfs4_ol_stateid *stp;
6841 struct net *net = SVC_NET(rqstp);
6842 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6843
6844 dprintk("NFSD: nfsd4_close on file %pd\n",
6845 cstate->current_fh.fh_dentry);
6846
6847 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
6848 &close->cl_stateid,
6849 NFS4_OPEN_STID|NFS4_CLOSED_STID,
6850 &stp, nn);
6851 nfsd4_bump_seqid(cstate, status);
6852 if (status)
6853 goto out;
6854
6855 stp->st_stid.sc_type = NFS4_CLOSED_STID;
6856
6857 /*
6858 * Technically we don't _really_ have to increment or copy it, since
6859 * it should just be gone after this operation and we clobber the
6860 * copied value below, but we continue to do so here just to ensure
6861 * that racing ops see that there was a state change.
6862 */
6863 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
6864
6865 nfsd4_close_open_stateid(stp);
6866 mutex_unlock(&stp->st_mutex);
6867
6868 /* v4.1+ suggests that we send a special stateid in here, since the
6869 * clients should just ignore this anyway. Since this is not useful
6870 * for v4.0 clients either, we set it to the special close_stateid
6871 * universally.
6872 *
6873 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
6874 */
6875 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
6876
6877 /* put reference from nfs4_preprocess_seqid_op */
6878 nfs4_put_stid(&stp->st_stid);
6879 out:
6880 return status;
6881 }
6882
6883 __be32
nfsd4_delegreturn(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)6884 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6885 union nfsd4_op_u *u)
6886 {
6887 struct nfsd4_delegreturn *dr = &u->delegreturn;
6888 struct nfs4_delegation *dp;
6889 stateid_t *stateid = &dr->dr_stateid;
6890 struct nfs4_stid *s;
6891 __be32 status;
6892 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6893
6894 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6895 return status;
6896
6897 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
6898 if (status)
6899 goto out;
6900 dp = delegstateid(s);
6901 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
6902 if (status)
6903 goto put_stateid;
6904
6905 wake_up_var(d_inode(cstate->current_fh.fh_dentry));
6906 destroy_delegation(dp);
6907 put_stateid:
6908 nfs4_put_stid(&dp->dl_stid);
6909 out:
6910 return status;
6911 }
6912
6913 /* last octet in a range */
6914 static inline u64
last_byte_offset(u64 start,u64 len)6915 last_byte_offset(u64 start, u64 len)
6916 {
6917 u64 end;
6918
6919 WARN_ON_ONCE(!len);
6920 end = start + len;
6921 return end > start ? end - 1: NFS4_MAX_UINT64;
6922 }
6923
6924 /*
6925 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
6926 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
6927 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
6928 * locking, this prevents us from being completely protocol-compliant. The
6929 * real solution to this problem is to start using unsigned file offsets in
6930 * the VFS, but this is a very deep change!
6931 */
6932 static inline void
nfs4_transform_lock_offset(struct file_lock * lock)6933 nfs4_transform_lock_offset(struct file_lock *lock)
6934 {
6935 if (lock->fl_start < 0)
6936 lock->fl_start = OFFSET_MAX;
6937 if (lock->fl_end < 0)
6938 lock->fl_end = OFFSET_MAX;
6939 }
6940
6941 static fl_owner_t
nfsd4_lm_get_owner(fl_owner_t owner)6942 nfsd4_lm_get_owner(fl_owner_t owner)
6943 {
6944 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6945
6946 nfs4_get_stateowner(&lo->lo_owner);
6947 return owner;
6948 }
6949
6950 static void
nfsd4_lm_put_owner(fl_owner_t owner)6951 nfsd4_lm_put_owner(fl_owner_t owner)
6952 {
6953 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6954
6955 if (lo)
6956 nfs4_put_stateowner(&lo->lo_owner);
6957 }
6958
6959 /* return pointer to struct nfs4_client if client is expirable */
6960 static bool
nfsd4_lm_lock_expirable(struct file_lock * cfl)6961 nfsd4_lm_lock_expirable(struct file_lock *cfl)
6962 {
6963 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)cfl->fl_owner;
6964 struct nfs4_client *clp = lo->lo_owner.so_client;
6965 struct nfsd_net *nn;
6966
6967 if (try_to_expire_client(clp)) {
6968 nn = net_generic(clp->net, nfsd_net_id);
6969 mod_delayed_work(laundry_wq, &nn->laundromat_work, 0);
6970 return true;
6971 }
6972 return false;
6973 }
6974
6975 /* schedule laundromat to run immediately and wait for it to complete */
6976 static void
nfsd4_lm_expire_lock(void)6977 nfsd4_lm_expire_lock(void)
6978 {
6979 flush_workqueue(laundry_wq);
6980 }
6981
6982 static void
nfsd4_lm_notify(struct file_lock * fl)6983 nfsd4_lm_notify(struct file_lock *fl)
6984 {
6985 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
6986 struct net *net = lo->lo_owner.so_client->net;
6987 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6988 struct nfsd4_blocked_lock *nbl = container_of(fl,
6989 struct nfsd4_blocked_lock, nbl_lock);
6990 bool queue = false;
6991
6992 /* An empty list means that something else is going to be using it */
6993 spin_lock(&nn->blocked_locks_lock);
6994 if (!list_empty(&nbl->nbl_list)) {
6995 list_del_init(&nbl->nbl_list);
6996 list_del_init(&nbl->nbl_lru);
6997 queue = true;
6998 }
6999 spin_unlock(&nn->blocked_locks_lock);
7000
7001 if (queue) {
7002 trace_nfsd_cb_notify_lock(lo, nbl);
7003 nfsd4_run_cb(&nbl->nbl_cb);
7004 }
7005 }
7006
7007 static const struct lock_manager_operations nfsd_posix_mng_ops = {
7008 .lm_mod_owner = THIS_MODULE,
7009 .lm_notify = nfsd4_lm_notify,
7010 .lm_get_owner = nfsd4_lm_get_owner,
7011 .lm_put_owner = nfsd4_lm_put_owner,
7012 .lm_lock_expirable = nfsd4_lm_lock_expirable,
7013 .lm_expire_lock = nfsd4_lm_expire_lock,
7014 };
7015
7016 static inline void
nfs4_set_lock_denied(struct file_lock * fl,struct nfsd4_lock_denied * deny)7017 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7018 {
7019 struct nfs4_lockowner *lo;
7020
7021 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7022 lo = (struct nfs4_lockowner *) fl->fl_owner;
7023 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
7024 GFP_KERNEL);
7025 if (!deny->ld_owner.data)
7026 /* We just don't care that much */
7027 goto nevermind;
7028 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7029 } else {
7030 nevermind:
7031 deny->ld_owner.len = 0;
7032 deny->ld_owner.data = NULL;
7033 deny->ld_clientid.cl_boot = 0;
7034 deny->ld_clientid.cl_id = 0;
7035 }
7036 deny->ld_start = fl->fl_start;
7037 deny->ld_length = NFS4_MAX_UINT64;
7038 if (fl->fl_end != NFS4_MAX_UINT64)
7039 deny->ld_length = fl->fl_end - fl->fl_start + 1;
7040 deny->ld_type = NFS4_READ_LT;
7041 if (fl->fl_type != F_RDLCK)
7042 deny->ld_type = NFS4_WRITE_LT;
7043 }
7044
7045 static struct nfs4_lockowner *
find_lockowner_str_locked(struct nfs4_client * clp,struct xdr_netobj * owner)7046 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7047 {
7048 unsigned int strhashval = ownerstr_hashval(owner);
7049 struct nfs4_stateowner *so;
7050
7051 lockdep_assert_held(&clp->cl_lock);
7052
7053 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7054 so_strhash) {
7055 if (so->so_is_open_owner)
7056 continue;
7057 if (same_owner_str(so, owner))
7058 return lockowner(nfs4_get_stateowner(so));
7059 }
7060 return NULL;
7061 }
7062
7063 static struct nfs4_lockowner *
find_lockowner_str(struct nfs4_client * clp,struct xdr_netobj * owner)7064 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7065 {
7066 struct nfs4_lockowner *lo;
7067
7068 spin_lock(&clp->cl_lock);
7069 lo = find_lockowner_str_locked(clp, owner);
7070 spin_unlock(&clp->cl_lock);
7071 return lo;
7072 }
7073
nfs4_unhash_lockowner(struct nfs4_stateowner * sop)7074 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7075 {
7076 unhash_lockowner_locked(lockowner(sop));
7077 }
7078
nfs4_free_lockowner(struct nfs4_stateowner * sop)7079 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7080 {
7081 struct nfs4_lockowner *lo = lockowner(sop);
7082
7083 kmem_cache_free(lockowner_slab, lo);
7084 }
7085
7086 static const struct nfs4_stateowner_operations lockowner_ops = {
7087 .so_unhash = nfs4_unhash_lockowner,
7088 .so_free = nfs4_free_lockowner,
7089 };
7090
7091 /*
7092 * Alloc a lock owner structure.
7093 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
7094 * occurred.
7095 *
7096 * strhashval = ownerstr_hashval
7097 */
7098 static struct nfs4_lockowner *
alloc_init_lock_stateowner(unsigned int strhashval,struct nfs4_client * clp,struct nfs4_ol_stateid * open_stp,struct nfsd4_lock * lock)7099 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7100 struct nfs4_ol_stateid *open_stp,
7101 struct nfsd4_lock *lock)
7102 {
7103 struct nfs4_lockowner *lo, *ret;
7104
7105 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
7106 if (!lo)
7107 return NULL;
7108 INIT_LIST_HEAD(&lo->lo_blocked);
7109 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
7110 lo->lo_owner.so_is_open_owner = 0;
7111 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7112 lo->lo_owner.so_ops = &lockowner_ops;
7113 spin_lock(&clp->cl_lock);
7114 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
7115 if (ret == NULL) {
7116 list_add(&lo->lo_owner.so_strhash,
7117 &clp->cl_ownerstr_hashtbl[strhashval]);
7118 ret = lo;
7119 } else
7120 nfs4_free_stateowner(&lo->lo_owner);
7121
7122 spin_unlock(&clp->cl_lock);
7123 return ret;
7124 }
7125
7126 static struct nfs4_ol_stateid *
find_lock_stateid(const struct nfs4_lockowner * lo,const struct nfs4_ol_stateid * ost)7127 find_lock_stateid(const struct nfs4_lockowner *lo,
7128 const struct nfs4_ol_stateid *ost)
7129 {
7130 struct nfs4_ol_stateid *lst;
7131
7132 lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7133
7134 /* If ost is not hashed, ost->st_locks will not be valid */
7135 if (!nfs4_ol_stateid_unhashed(ost))
7136 list_for_each_entry(lst, &ost->st_locks, st_locks) {
7137 if (lst->st_stateowner == &lo->lo_owner) {
7138 refcount_inc(&lst->st_stid.sc_count);
7139 return lst;
7140 }
7141 }
7142 return NULL;
7143 }
7144
7145 static struct nfs4_ol_stateid *
init_lock_stateid(struct nfs4_ol_stateid * stp,struct nfs4_lockowner * lo,struct nfs4_file * fp,struct inode * inode,struct nfs4_ol_stateid * open_stp)7146 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7147 struct nfs4_file *fp, struct inode *inode,
7148 struct nfs4_ol_stateid *open_stp)
7149 {
7150 struct nfs4_client *clp = lo->lo_owner.so_client;
7151 struct nfs4_ol_stateid *retstp;
7152
7153 mutex_init(&stp->st_mutex);
7154 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
7155 retry:
7156 spin_lock(&clp->cl_lock);
7157 if (nfs4_ol_stateid_unhashed(open_stp))
7158 goto out_close;
7159 retstp = find_lock_stateid(lo, open_stp);
7160 if (retstp)
7161 goto out_found;
7162 refcount_inc(&stp->st_stid.sc_count);
7163 stp->st_stid.sc_type = NFS4_LOCK_STID;
7164 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
7165 get_nfs4_file(fp);
7166 stp->st_stid.sc_file = fp;
7167 stp->st_access_bmap = 0;
7168 stp->st_deny_bmap = open_stp->st_deny_bmap;
7169 stp->st_openstp = open_stp;
7170 spin_lock(&fp->fi_lock);
7171 list_add(&stp->st_locks, &open_stp->st_locks);
7172 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
7173 list_add(&stp->st_perfile, &fp->fi_stateids);
7174 spin_unlock(&fp->fi_lock);
7175 spin_unlock(&clp->cl_lock);
7176 return stp;
7177 out_found:
7178 spin_unlock(&clp->cl_lock);
7179 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
7180 nfs4_put_stid(&retstp->st_stid);
7181 goto retry;
7182 }
7183 /* To keep mutex tracking happy */
7184 mutex_unlock(&stp->st_mutex);
7185 return retstp;
7186 out_close:
7187 spin_unlock(&clp->cl_lock);
7188 mutex_unlock(&stp->st_mutex);
7189 return NULL;
7190 }
7191
7192 static struct nfs4_ol_stateid *
find_or_create_lock_stateid(struct nfs4_lockowner * lo,struct nfs4_file * fi,struct inode * inode,struct nfs4_ol_stateid * ost,bool * new)7193 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
7194 struct inode *inode, struct nfs4_ol_stateid *ost,
7195 bool *new)
7196 {
7197 struct nfs4_stid *ns = NULL;
7198 struct nfs4_ol_stateid *lst;
7199 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7200 struct nfs4_client *clp = oo->oo_owner.so_client;
7201
7202 *new = false;
7203 spin_lock(&clp->cl_lock);
7204 lst = find_lock_stateid(lo, ost);
7205 spin_unlock(&clp->cl_lock);
7206 if (lst != NULL) {
7207 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
7208 goto out;
7209 nfs4_put_stid(&lst->st_stid);
7210 }
7211 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
7212 if (ns == NULL)
7213 return NULL;
7214
7215 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
7216 if (lst == openlockstateid(ns))
7217 *new = true;
7218 else
7219 nfs4_put_stid(ns);
7220 out:
7221 return lst;
7222 }
7223
7224 static int
check_lock_length(u64 offset,u64 length)7225 check_lock_length(u64 offset, u64 length)
7226 {
7227 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
7228 (length > ~offset)));
7229 }
7230
get_lock_access(struct nfs4_ol_stateid * lock_stp,u32 access)7231 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
7232 {
7233 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
7234
7235 lockdep_assert_held(&fp->fi_lock);
7236
7237 if (test_access(access, lock_stp))
7238 return;
7239 __nfs4_file_get_access(fp, access);
7240 set_access(access, lock_stp);
7241 }
7242
7243 static __be32
lookup_or_create_lock_state(struct nfsd4_compound_state * cstate,struct nfs4_ol_stateid * ost,struct nfsd4_lock * lock,struct nfs4_ol_stateid ** plst,bool * new)7244 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
7245 struct nfs4_ol_stateid *ost,
7246 struct nfsd4_lock *lock,
7247 struct nfs4_ol_stateid **plst, bool *new)
7248 {
7249 __be32 status;
7250 struct nfs4_file *fi = ost->st_stid.sc_file;
7251 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
7252 struct nfs4_client *cl = oo->oo_owner.so_client;
7253 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
7254 struct nfs4_lockowner *lo;
7255 struct nfs4_ol_stateid *lst;
7256 unsigned int strhashval;
7257
7258 lo = find_lockowner_str(cl, &lock->lk_new_owner);
7259 if (!lo) {
7260 strhashval = ownerstr_hashval(&lock->lk_new_owner);
7261 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
7262 if (lo == NULL)
7263 return nfserr_jukebox;
7264 } else {
7265 /* with an existing lockowner, seqids must be the same */
7266 status = nfserr_bad_seqid;
7267 if (!cstate->minorversion &&
7268 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
7269 goto out;
7270 }
7271
7272 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
7273 if (lst == NULL) {
7274 status = nfserr_jukebox;
7275 goto out;
7276 }
7277
7278 status = nfs_ok;
7279 *plst = lst;
7280 out:
7281 nfs4_put_stateowner(&lo->lo_owner);
7282 return status;
7283 }
7284
7285 /*
7286 * LOCK operation
7287 */
7288 __be32
nfsd4_lock(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7289 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7290 union nfsd4_op_u *u)
7291 {
7292 struct nfsd4_lock *lock = &u->lock;
7293 struct nfs4_openowner *open_sop = NULL;
7294 struct nfs4_lockowner *lock_sop = NULL;
7295 struct nfs4_ol_stateid *lock_stp = NULL;
7296 struct nfs4_ol_stateid *open_stp = NULL;
7297 struct nfs4_file *fp;
7298 struct nfsd_file *nf = NULL;
7299 struct nfsd4_blocked_lock *nbl = NULL;
7300 struct file_lock *file_lock = NULL;
7301 struct file_lock *conflock = NULL;
7302 __be32 status = 0;
7303 int lkflg;
7304 int err;
7305 bool new = false;
7306 unsigned char fl_type;
7307 unsigned int fl_flags = FL_POSIX;
7308 struct net *net = SVC_NET(rqstp);
7309 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7310
7311 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
7312 (long long) lock->lk_offset,
7313 (long long) lock->lk_length);
7314
7315 if (check_lock_length(lock->lk_offset, lock->lk_length))
7316 return nfserr_inval;
7317
7318 if ((status = fh_verify(rqstp, &cstate->current_fh,
7319 S_IFREG, NFSD_MAY_LOCK))) {
7320 dprintk("NFSD: nfsd4_lock: permission denied!\n");
7321 return status;
7322 }
7323
7324 if (lock->lk_is_new) {
7325 if (nfsd4_has_session(cstate))
7326 /* See rfc 5661 18.10.3: given clientid is ignored: */
7327 memcpy(&lock->lk_new_clientid,
7328 &cstate->clp->cl_clientid,
7329 sizeof(clientid_t));
7330
7331 /* validate and update open stateid and open seqid */
7332 status = nfs4_preprocess_confirmed_seqid_op(cstate,
7333 lock->lk_new_open_seqid,
7334 &lock->lk_new_open_stateid,
7335 &open_stp, nn);
7336 if (status)
7337 goto out;
7338 mutex_unlock(&open_stp->st_mutex);
7339 open_sop = openowner(open_stp->st_stateowner);
7340 status = nfserr_bad_stateid;
7341 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
7342 &lock->lk_new_clientid))
7343 goto out;
7344 status = lookup_or_create_lock_state(cstate, open_stp, lock,
7345 &lock_stp, &new);
7346 } else {
7347 status = nfs4_preprocess_seqid_op(cstate,
7348 lock->lk_old_lock_seqid,
7349 &lock->lk_old_lock_stateid,
7350 NFS4_LOCK_STID, &lock_stp, nn);
7351 }
7352 if (status)
7353 goto out;
7354 lock_sop = lockowner(lock_stp->st_stateowner);
7355
7356 lkflg = setlkflg(lock->lk_type);
7357 status = nfs4_check_openmode(lock_stp, lkflg);
7358 if (status)
7359 goto out;
7360
7361 status = nfserr_grace;
7362 if (locks_in_grace(net) && !lock->lk_reclaim)
7363 goto out;
7364 status = nfserr_no_grace;
7365 if (!locks_in_grace(net) && lock->lk_reclaim)
7366 goto out;
7367
7368 if (lock->lk_reclaim)
7369 fl_flags |= FL_RECLAIM;
7370
7371 fp = lock_stp->st_stid.sc_file;
7372 switch (lock->lk_type) {
7373 case NFS4_READW_LT:
7374 if (nfsd4_has_session(cstate))
7375 fl_flags |= FL_SLEEP;
7376 fallthrough;
7377 case NFS4_READ_LT:
7378 spin_lock(&fp->fi_lock);
7379 nf = find_readable_file_locked(fp);
7380 if (nf)
7381 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
7382 spin_unlock(&fp->fi_lock);
7383 fl_type = F_RDLCK;
7384 break;
7385 case NFS4_WRITEW_LT:
7386 if (nfsd4_has_session(cstate))
7387 fl_flags |= FL_SLEEP;
7388 fallthrough;
7389 case NFS4_WRITE_LT:
7390 spin_lock(&fp->fi_lock);
7391 nf = find_writeable_file_locked(fp);
7392 if (nf)
7393 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
7394 spin_unlock(&fp->fi_lock);
7395 fl_type = F_WRLCK;
7396 break;
7397 default:
7398 status = nfserr_inval;
7399 goto out;
7400 }
7401
7402 if (!nf) {
7403 status = nfserr_openmode;
7404 goto out;
7405 }
7406
7407 /*
7408 * Most filesystems with their own ->lock operations will block
7409 * the nfsd thread waiting to acquire the lock. That leads to
7410 * deadlocks (we don't want every nfsd thread tied up waiting
7411 * for file locks), so don't attempt blocking lock notifications
7412 * on those filesystems:
7413 */
7414 if (nf->nf_file->f_op->lock)
7415 fl_flags &= ~FL_SLEEP;
7416
7417 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
7418 if (!nbl) {
7419 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
7420 status = nfserr_jukebox;
7421 goto out;
7422 }
7423
7424 file_lock = &nbl->nbl_lock;
7425 file_lock->fl_type = fl_type;
7426 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
7427 file_lock->fl_pid = current->tgid;
7428 file_lock->fl_file = nf->nf_file;
7429 file_lock->fl_flags = fl_flags;
7430 file_lock->fl_lmops = &nfsd_posix_mng_ops;
7431 file_lock->fl_start = lock->lk_offset;
7432 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
7433 nfs4_transform_lock_offset(file_lock);
7434
7435 conflock = locks_alloc_lock();
7436 if (!conflock) {
7437 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7438 status = nfserr_jukebox;
7439 goto out;
7440 }
7441
7442 if (fl_flags & FL_SLEEP) {
7443 nbl->nbl_time = ktime_get_boottime_seconds();
7444 spin_lock(&nn->blocked_locks_lock);
7445 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
7446 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
7447 kref_get(&nbl->nbl_kref);
7448 spin_unlock(&nn->blocked_locks_lock);
7449 }
7450
7451 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
7452 switch (err) {
7453 case 0: /* success! */
7454 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
7455 status = 0;
7456 if (lock->lk_reclaim)
7457 nn->somebody_reclaimed = true;
7458 break;
7459 case FILE_LOCK_DEFERRED:
7460 kref_put(&nbl->nbl_kref, free_nbl);
7461 nbl = NULL;
7462 fallthrough;
7463 case -EAGAIN: /* conflock holds conflicting lock */
7464 status = nfserr_denied;
7465 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
7466 nfs4_set_lock_denied(conflock, &lock->lk_denied);
7467 break;
7468 case -EDEADLK:
7469 status = nfserr_deadlock;
7470 break;
7471 default:
7472 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
7473 status = nfserrno(err);
7474 break;
7475 }
7476 out:
7477 if (nbl) {
7478 /* dequeue it if we queued it before */
7479 if (fl_flags & FL_SLEEP) {
7480 spin_lock(&nn->blocked_locks_lock);
7481 if (!list_empty(&nbl->nbl_list) &&
7482 !list_empty(&nbl->nbl_lru)) {
7483 list_del_init(&nbl->nbl_list);
7484 list_del_init(&nbl->nbl_lru);
7485 kref_put(&nbl->nbl_kref, free_nbl);
7486 }
7487 /* nbl can use one of lists to be linked to reaplist */
7488 spin_unlock(&nn->blocked_locks_lock);
7489 }
7490 free_blocked_lock(nbl);
7491 }
7492 if (nf)
7493 nfsd_file_put(nf);
7494 if (lock_stp) {
7495 /* Bump seqid manually if the 4.0 replay owner is openowner */
7496 if (cstate->replay_owner &&
7497 cstate->replay_owner != &lock_sop->lo_owner &&
7498 seqid_mutating_err(ntohl(status)))
7499 lock_sop->lo_owner.so_seqid++;
7500
7501 /*
7502 * If this is a new, never-before-used stateid, and we are
7503 * returning an error, then just go ahead and release it.
7504 */
7505 if (status && new)
7506 release_lock_stateid(lock_stp);
7507
7508 mutex_unlock(&lock_stp->st_mutex);
7509
7510 nfs4_put_stid(&lock_stp->st_stid);
7511 }
7512 if (open_stp)
7513 nfs4_put_stid(&open_stp->st_stid);
7514 nfsd4_bump_seqid(cstate, status);
7515 if (conflock)
7516 locks_free_lock(conflock);
7517 return status;
7518 }
7519
7520 /*
7521 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
7522 * so we do a temporary open here just to get an open file to pass to
7523 * vfs_test_lock.
7524 */
nfsd_test_lock(struct svc_rqst * rqstp,struct svc_fh * fhp,struct file_lock * lock)7525 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
7526 {
7527 struct nfsd_file *nf;
7528 struct inode *inode;
7529 __be32 err;
7530
7531 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
7532 if (err)
7533 return err;
7534 inode = fhp->fh_dentry->d_inode;
7535 inode_lock(inode); /* to block new leases till after test_lock: */
7536 err = nfserrno(nfsd_open_break_lease(inode, NFSD_MAY_READ));
7537 if (err)
7538 goto out;
7539 lock->fl_file = nf->nf_file;
7540 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
7541 lock->fl_file = NULL;
7542 out:
7543 inode_unlock(inode);
7544 nfsd_file_put(nf);
7545 return err;
7546 }
7547
7548 /*
7549 * LOCKT operation
7550 */
7551 __be32
nfsd4_lockt(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7552 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7553 union nfsd4_op_u *u)
7554 {
7555 struct nfsd4_lockt *lockt = &u->lockt;
7556 struct file_lock *file_lock = NULL;
7557 struct nfs4_lockowner *lo = NULL;
7558 __be32 status;
7559 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7560
7561 if (locks_in_grace(SVC_NET(rqstp)))
7562 return nfserr_grace;
7563
7564 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
7565 return nfserr_inval;
7566
7567 if (!nfsd4_has_session(cstate)) {
7568 status = set_client(&lockt->lt_clientid, cstate, nn);
7569 if (status)
7570 goto out;
7571 }
7572
7573 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7574 goto out;
7575
7576 file_lock = locks_alloc_lock();
7577 if (!file_lock) {
7578 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7579 status = nfserr_jukebox;
7580 goto out;
7581 }
7582
7583 switch (lockt->lt_type) {
7584 case NFS4_READ_LT:
7585 case NFS4_READW_LT:
7586 file_lock->fl_type = F_RDLCK;
7587 break;
7588 case NFS4_WRITE_LT:
7589 case NFS4_WRITEW_LT:
7590 file_lock->fl_type = F_WRLCK;
7591 break;
7592 default:
7593 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
7594 status = nfserr_inval;
7595 goto out;
7596 }
7597
7598 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
7599 if (lo)
7600 file_lock->fl_owner = (fl_owner_t)lo;
7601 file_lock->fl_pid = current->tgid;
7602 file_lock->fl_flags = FL_POSIX;
7603
7604 file_lock->fl_start = lockt->lt_offset;
7605 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
7606
7607 nfs4_transform_lock_offset(file_lock);
7608
7609 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
7610 if (status)
7611 goto out;
7612
7613 if (file_lock->fl_type != F_UNLCK) {
7614 status = nfserr_denied;
7615 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
7616 }
7617 out:
7618 if (lo)
7619 nfs4_put_stateowner(&lo->lo_owner);
7620 if (file_lock)
7621 locks_free_lock(file_lock);
7622 return status;
7623 }
7624
7625 __be32
nfsd4_locku(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7626 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7627 union nfsd4_op_u *u)
7628 {
7629 struct nfsd4_locku *locku = &u->locku;
7630 struct nfs4_ol_stateid *stp;
7631 struct nfsd_file *nf = NULL;
7632 struct file_lock *file_lock = NULL;
7633 __be32 status;
7634 int err;
7635 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7636
7637 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
7638 (long long) locku->lu_offset,
7639 (long long) locku->lu_length);
7640
7641 if (check_lock_length(locku->lu_offset, locku->lu_length))
7642 return nfserr_inval;
7643
7644 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
7645 &locku->lu_stateid, NFS4_LOCK_STID,
7646 &stp, nn);
7647 if (status)
7648 goto out;
7649 nf = find_any_file(stp->st_stid.sc_file);
7650 if (!nf) {
7651 status = nfserr_lock_range;
7652 goto put_stateid;
7653 }
7654 file_lock = locks_alloc_lock();
7655 if (!file_lock) {
7656 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7657 status = nfserr_jukebox;
7658 goto put_file;
7659 }
7660
7661 file_lock->fl_type = F_UNLCK;
7662 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
7663 file_lock->fl_pid = current->tgid;
7664 file_lock->fl_file = nf->nf_file;
7665 file_lock->fl_flags = FL_POSIX;
7666 file_lock->fl_lmops = &nfsd_posix_mng_ops;
7667 file_lock->fl_start = locku->lu_offset;
7668
7669 file_lock->fl_end = last_byte_offset(locku->lu_offset,
7670 locku->lu_length);
7671 nfs4_transform_lock_offset(file_lock);
7672
7673 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
7674 if (err) {
7675 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
7676 goto out_nfserr;
7677 }
7678 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
7679 put_file:
7680 nfsd_file_put(nf);
7681 put_stateid:
7682 mutex_unlock(&stp->st_mutex);
7683 nfs4_put_stid(&stp->st_stid);
7684 out:
7685 nfsd4_bump_seqid(cstate, status);
7686 if (file_lock)
7687 locks_free_lock(file_lock);
7688 return status;
7689
7690 out_nfserr:
7691 status = nfserrno(err);
7692 goto put_file;
7693 }
7694
7695 /*
7696 * returns
7697 * true: locks held by lockowner
7698 * false: no locks held by lockowner
7699 */
7700 static bool
check_for_locks(struct nfs4_file * fp,struct nfs4_lockowner * lowner)7701 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
7702 {
7703 struct file_lock *fl;
7704 int status = false;
7705 struct nfsd_file *nf = find_any_file(fp);
7706 struct inode *inode;
7707 struct file_lock_context *flctx;
7708
7709 if (!nf) {
7710 /* Any valid lock stateid should have some sort of access */
7711 WARN_ON_ONCE(1);
7712 return status;
7713 }
7714
7715 inode = locks_inode(nf->nf_file);
7716 flctx = inode->i_flctx;
7717
7718 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
7719 spin_lock(&flctx->flc_lock);
7720 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
7721 if (fl->fl_owner == (fl_owner_t)lowner) {
7722 status = true;
7723 break;
7724 }
7725 }
7726 spin_unlock(&flctx->flc_lock);
7727 }
7728 nfsd_file_put(nf);
7729 return status;
7730 }
7731
7732 /**
7733 * nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
7734 * @rqstp: RPC transaction
7735 * @cstate: NFSv4 COMPOUND state
7736 * @u: RELEASE_LOCKOWNER arguments
7737 *
7738 * The lockowner's so_count is bumped when a lock record is added
7739 * or when copying a conflicting lock. The latter case is brief,
7740 * but can lead to fleeting false positives when looking for
7741 * locks-in-use.
7742 *
7743 * Return values:
7744 * %nfs_ok: lockowner released or not found
7745 * %nfserr_locks_held: lockowner still in use
7746 * %nfserr_stale_clientid: clientid no longer active
7747 * %nfserr_expired: clientid not recognized
7748 */
7749 __be32
nfsd4_release_lockowner(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)7750 nfsd4_release_lockowner(struct svc_rqst *rqstp,
7751 struct nfsd4_compound_state *cstate,
7752 union nfsd4_op_u *u)
7753 {
7754 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
7755 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
7756 clientid_t *clid = &rlockowner->rl_clientid;
7757 struct nfs4_ol_stateid *stp;
7758 struct nfs4_lockowner *lo;
7759 struct nfs4_client *clp;
7760 LIST_HEAD(reaplist);
7761 __be32 status;
7762
7763 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
7764 clid->cl_boot, clid->cl_id);
7765
7766 status = set_client(clid, cstate, nn);
7767 if (status)
7768 return status;
7769 clp = cstate->clp;
7770
7771 spin_lock(&clp->cl_lock);
7772 lo = find_lockowner_str_locked(clp, &rlockowner->rl_owner);
7773 if (!lo) {
7774 spin_unlock(&clp->cl_lock);
7775 return nfs_ok;
7776 }
7777 if (atomic_read(&lo->lo_owner.so_count) != 2) {
7778 spin_unlock(&clp->cl_lock);
7779 nfs4_put_stateowner(&lo->lo_owner);
7780 return nfserr_locks_held;
7781 }
7782 unhash_lockowner_locked(lo);
7783 while (!list_empty(&lo->lo_owner.so_stateids)) {
7784 stp = list_first_entry(&lo->lo_owner.so_stateids,
7785 struct nfs4_ol_stateid,
7786 st_perstateowner);
7787 WARN_ON(!unhash_lock_stateid(stp));
7788 put_ol_stateid_locked(stp, &reaplist);
7789 }
7790 spin_unlock(&clp->cl_lock);
7791
7792 free_ol_stateid_reaplist(&reaplist);
7793 remove_blocked_locks(lo);
7794 nfs4_put_stateowner(&lo->lo_owner);
7795 return nfs_ok;
7796 }
7797
7798 static inline struct nfs4_client_reclaim *
alloc_reclaim(void)7799 alloc_reclaim(void)
7800 {
7801 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
7802 }
7803
7804 bool
nfs4_has_reclaimed_state(struct xdr_netobj name,struct nfsd_net * nn)7805 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
7806 {
7807 struct nfs4_client_reclaim *crp;
7808
7809 crp = nfsd4_find_reclaim_client(name, nn);
7810 return (crp && crp->cr_clp);
7811 }
7812
7813 /*
7814 * failure => all reset bets are off, nfserr_no_grace...
7815 *
7816 * The caller is responsible for freeing name.data if NULL is returned (it
7817 * will be freed in nfs4_remove_reclaim_record in the normal case).
7818 */
7819 struct nfs4_client_reclaim *
nfs4_client_to_reclaim(struct xdr_netobj name,struct xdr_netobj princhash,struct nfsd_net * nn)7820 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
7821 struct nfsd_net *nn)
7822 {
7823 unsigned int strhashval;
7824 struct nfs4_client_reclaim *crp;
7825
7826 crp = alloc_reclaim();
7827 if (crp) {
7828 strhashval = clientstr_hashval(name);
7829 INIT_LIST_HEAD(&crp->cr_strhash);
7830 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
7831 crp->cr_name.data = name.data;
7832 crp->cr_name.len = name.len;
7833 crp->cr_princhash.data = princhash.data;
7834 crp->cr_princhash.len = princhash.len;
7835 crp->cr_clp = NULL;
7836 nn->reclaim_str_hashtbl_size++;
7837 }
7838 return crp;
7839 }
7840
7841 void
nfs4_remove_reclaim_record(struct nfs4_client_reclaim * crp,struct nfsd_net * nn)7842 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
7843 {
7844 list_del(&crp->cr_strhash);
7845 kfree(crp->cr_name.data);
7846 kfree(crp->cr_princhash.data);
7847 kfree(crp);
7848 nn->reclaim_str_hashtbl_size--;
7849 }
7850
7851 void
nfs4_release_reclaim(struct nfsd_net * nn)7852 nfs4_release_reclaim(struct nfsd_net *nn)
7853 {
7854 struct nfs4_client_reclaim *crp = NULL;
7855 int i;
7856
7857 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7858 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
7859 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
7860 struct nfs4_client_reclaim, cr_strhash);
7861 nfs4_remove_reclaim_record(crp, nn);
7862 }
7863 }
7864 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
7865 }
7866
7867 /*
7868 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
7869 struct nfs4_client_reclaim *
nfsd4_find_reclaim_client(struct xdr_netobj name,struct nfsd_net * nn)7870 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
7871 {
7872 unsigned int strhashval;
7873 struct nfs4_client_reclaim *crp = NULL;
7874
7875 strhashval = clientstr_hashval(name);
7876 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
7877 if (compare_blob(&crp->cr_name, &name) == 0) {
7878 return crp;
7879 }
7880 }
7881 return NULL;
7882 }
7883
7884 __be32
nfs4_check_open_reclaim(struct nfs4_client * clp)7885 nfs4_check_open_reclaim(struct nfs4_client *clp)
7886 {
7887 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
7888 return nfserr_no_grace;
7889
7890 if (nfsd4_client_record_check(clp))
7891 return nfserr_reclaim_bad;
7892
7893 return nfs_ok;
7894 }
7895
7896 /*
7897 * Since the lifetime of a delegation isn't limited to that of an open, a
7898 * client may quite reasonably hang on to a delegation as long as it has
7899 * the inode cached. This becomes an obvious problem the first time a
7900 * client's inode cache approaches the size of the server's total memory.
7901 *
7902 * For now we avoid this problem by imposing a hard limit on the number
7903 * of delegations, which varies according to the server's memory size.
7904 */
7905 static void
set_max_delegations(void)7906 set_max_delegations(void)
7907 {
7908 /*
7909 * Allow at most 4 delegations per megabyte of RAM. Quick
7910 * estimates suggest that in the worst case (where every delegation
7911 * is for a different inode), a delegation could take about 1.5K,
7912 * giving a worst case usage of about 6% of memory.
7913 */
7914 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7915 }
7916
nfs4_state_create_net(struct net * net)7917 static int nfs4_state_create_net(struct net *net)
7918 {
7919 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7920 int i;
7921
7922 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7923 sizeof(struct list_head),
7924 GFP_KERNEL);
7925 if (!nn->conf_id_hashtbl)
7926 goto err;
7927 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7928 sizeof(struct list_head),
7929 GFP_KERNEL);
7930 if (!nn->unconf_id_hashtbl)
7931 goto err_unconf_id;
7932 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
7933 sizeof(struct list_head),
7934 GFP_KERNEL);
7935 if (!nn->sessionid_hashtbl)
7936 goto err_sessionid;
7937
7938 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7939 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7940 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7941 }
7942 for (i = 0; i < SESSION_HASH_SIZE; i++)
7943 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7944 nn->conf_name_tree = RB_ROOT;
7945 nn->unconf_name_tree = RB_ROOT;
7946 nn->boot_time = ktime_get_real_seconds();
7947 nn->grace_ended = false;
7948 nn->nfsd4_manager.block_opens = true;
7949 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7950 INIT_LIST_HEAD(&nn->client_lru);
7951 INIT_LIST_HEAD(&nn->close_lru);
7952 INIT_LIST_HEAD(&nn->del_recall_lru);
7953 spin_lock_init(&nn->client_lock);
7954 spin_lock_init(&nn->s2s_cp_lock);
7955 idr_init(&nn->s2s_cp_stateids);
7956
7957 spin_lock_init(&nn->blocked_locks_lock);
7958 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7959
7960 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7961 INIT_DELAYED_WORK(&nn->nfsd_shrinker_work, courtesy_client_reaper);
7962 get_net(net);
7963
7964 return 0;
7965
7966 err_sessionid:
7967 kfree(nn->unconf_id_hashtbl);
7968 err_unconf_id:
7969 kfree(nn->conf_id_hashtbl);
7970 err:
7971 return -ENOMEM;
7972 }
7973
7974 static void
nfs4_state_destroy_net(struct net * net)7975 nfs4_state_destroy_net(struct net *net)
7976 {
7977 int i;
7978 struct nfs4_client *clp = NULL;
7979 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7980
7981 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7982 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7983 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7984 destroy_client(clp);
7985 }
7986 }
7987
7988 WARN_ON(!list_empty(&nn->blocked_locks_lru));
7989
7990 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7991 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7992 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7993 destroy_client(clp);
7994 }
7995 }
7996
7997 kfree(nn->sessionid_hashtbl);
7998 kfree(nn->unconf_id_hashtbl);
7999 kfree(nn->conf_id_hashtbl);
8000 put_net(net);
8001 }
8002
8003 int
nfs4_state_start_net(struct net * net)8004 nfs4_state_start_net(struct net *net)
8005 {
8006 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8007 int ret;
8008
8009 ret = nfs4_state_create_net(net);
8010 if (ret)
8011 return ret;
8012 locks_start_grace(net, &nn->nfsd4_manager);
8013 nfsd4_client_tracking_init(net);
8014 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8015 goto skip_grace;
8016 printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8017 nn->nfsd4_grace, net->ns.inum);
8018 trace_nfsd_grace_start(nn);
8019 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
8020 return 0;
8021
8022 skip_grace:
8023 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8024 net->ns.inum);
8025 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
8026 nfsd4_end_grace(nn);
8027 return 0;
8028 }
8029
8030 /* initialization to perform when the nfsd service is started: */
8031
8032 int
nfs4_state_start(void)8033 nfs4_state_start(void)
8034 {
8035 int ret;
8036
8037 ret = nfsd4_create_callback_queue();
8038 if (ret)
8039 return ret;
8040
8041 set_max_delegations();
8042 return 0;
8043 }
8044
8045 void
nfs4_state_shutdown_net(struct net * net)8046 nfs4_state_shutdown_net(struct net *net)
8047 {
8048 struct nfs4_delegation *dp = NULL;
8049 struct list_head *pos, *next, reaplist;
8050 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
8051
8052 cancel_delayed_work_sync(&nn->laundromat_work);
8053 locks_end_grace(&nn->nfsd4_manager);
8054
8055 INIT_LIST_HEAD(&reaplist);
8056 spin_lock(&state_lock);
8057 list_for_each_safe(pos, next, &nn->del_recall_lru) {
8058 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8059 WARN_ON(!unhash_delegation_locked(dp));
8060 list_add(&dp->dl_recall_lru, &reaplist);
8061 }
8062 spin_unlock(&state_lock);
8063 list_for_each_safe(pos, next, &reaplist) {
8064 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8065 list_del_init(&dp->dl_recall_lru);
8066 destroy_unhashed_deleg(dp);
8067 }
8068
8069 nfsd4_client_tracking_exit(net);
8070 nfs4_state_destroy_net(net);
8071 #ifdef CONFIG_NFSD_V4_2_INTER_SSC
8072 nfsd4_ssc_shutdown_umount(nn);
8073 #endif
8074 }
8075
8076 void
nfs4_state_shutdown(void)8077 nfs4_state_shutdown(void)
8078 {
8079 nfsd4_destroy_callback_queue();
8080 }
8081
8082 static void
get_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8083 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8084 {
8085 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8086 CURRENT_STATEID(stateid))
8087 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8088 }
8089
8090 static void
put_stateid(struct nfsd4_compound_state * cstate,stateid_t * stateid)8091 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8092 {
8093 if (cstate->minorversion) {
8094 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8095 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8096 }
8097 }
8098
8099 void
clear_current_stateid(struct nfsd4_compound_state * cstate)8100 clear_current_stateid(struct nfsd4_compound_state *cstate)
8101 {
8102 CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8103 }
8104
8105 /*
8106 * functions to set current state id
8107 */
8108 void
nfsd4_set_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8109 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8110 union nfsd4_op_u *u)
8111 {
8112 put_stateid(cstate, &u->open_downgrade.od_stateid);
8113 }
8114
8115 void
nfsd4_set_openstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8116 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8117 union nfsd4_op_u *u)
8118 {
8119 put_stateid(cstate, &u->open.op_stateid);
8120 }
8121
8122 void
nfsd4_set_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8123 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8124 union nfsd4_op_u *u)
8125 {
8126 put_stateid(cstate, &u->close.cl_stateid);
8127 }
8128
8129 void
nfsd4_set_lockstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8130 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8131 union nfsd4_op_u *u)
8132 {
8133 put_stateid(cstate, &u->lock.lk_resp_stateid);
8134 }
8135
8136 /*
8137 * functions to consume current state id
8138 */
8139
8140 void
nfsd4_get_opendowngradestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8141 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8142 union nfsd4_op_u *u)
8143 {
8144 get_stateid(cstate, &u->open_downgrade.od_stateid);
8145 }
8146
8147 void
nfsd4_get_delegreturnstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8148 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8149 union nfsd4_op_u *u)
8150 {
8151 get_stateid(cstate, &u->delegreturn.dr_stateid);
8152 }
8153
8154 void
nfsd4_get_freestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8155 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8156 union nfsd4_op_u *u)
8157 {
8158 get_stateid(cstate, &u->free_stateid.fr_stateid);
8159 }
8160
8161 void
nfsd4_get_setattrstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8162 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8163 union nfsd4_op_u *u)
8164 {
8165 get_stateid(cstate, &u->setattr.sa_stateid);
8166 }
8167
8168 void
nfsd4_get_closestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8169 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8170 union nfsd4_op_u *u)
8171 {
8172 get_stateid(cstate, &u->close.cl_stateid);
8173 }
8174
8175 void
nfsd4_get_lockustateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8176 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8177 union nfsd4_op_u *u)
8178 {
8179 get_stateid(cstate, &u->locku.lu_stateid);
8180 }
8181
8182 void
nfsd4_get_readstateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8183 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8184 union nfsd4_op_u *u)
8185 {
8186 get_stateid(cstate, &u->read.rd_stateid);
8187 }
8188
8189 void
nfsd4_get_writestateid(struct nfsd4_compound_state * cstate,union nfsd4_op_u * u)8190 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8191 union nfsd4_op_u *u)
8192 {
8193 get_stateid(cstate, &u->write.wr_stateid);
8194 }
8195