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 <andros@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 #ifndef _NFSD4_STATE_H
36 #define _NFSD4_STATE_H
37
38 #include <linux/idr.h>
39 #include <linux/refcount.h>
40 #include <linux/sunrpc/svc_xprt.h>
41 #include "nfsfh.h"
42
43 typedef struct {
44 u32 cl_boot;
45 u32 cl_id;
46 } clientid_t;
47
48 typedef struct {
49 clientid_t so_clid;
50 u32 so_id;
51 } stateid_opaque_t;
52
53 typedef struct {
54 u32 si_generation;
55 stateid_opaque_t si_opaque;
56 } stateid_t;
57
58 #define STATEID_FMT "(%08x/%08x/%08x/%08x)"
59 #define STATEID_VAL(s) \
60 (s)->si_opaque.so_clid.cl_boot, \
61 (s)->si_opaque.so_clid.cl_id, \
62 (s)->si_opaque.so_id, \
63 (s)->si_generation
64
65 struct nfsd4_callback {
66 struct nfs4_client *cb_clp;
67 struct rpc_message cb_msg;
68 const struct nfsd4_callback_ops *cb_ops;
69 struct work_struct cb_work;
70 int cb_seq_status;
71 int cb_status;
72 bool cb_need_restart;
73 };
74
75 struct nfsd4_callback_ops {
76 void (*prepare)(struct nfsd4_callback *);
77 int (*done)(struct nfsd4_callback *, struct rpc_task *);
78 void (*release)(struct nfsd4_callback *);
79 };
80
81 /*
82 * A core object that represents a "common" stateid. These are generally
83 * embedded within the different (more specific) stateid objects and contain
84 * fields that are of general use to any stateid.
85 */
86 struct nfs4_stid {
87 refcount_t sc_count;
88 #define NFS4_OPEN_STID 1
89 #define NFS4_LOCK_STID 2
90 #define NFS4_DELEG_STID 4
91 /* For an open stateid kept around *only* to process close replays: */
92 #define NFS4_CLOSED_STID 8
93 /* For a deleg stateid kept around only to process free_stateid's: */
94 #define NFS4_REVOKED_DELEG_STID 16
95 #define NFS4_CLOSED_DELEG_STID 32
96 #define NFS4_LAYOUT_STID 64
97 unsigned char sc_type;
98 stateid_t sc_stateid;
99 spinlock_t sc_lock;
100 struct nfs4_client *sc_client;
101 struct nfs4_file *sc_file;
102 void (*sc_free)(struct nfs4_stid *);
103 };
104
105 /*
106 * Represents a delegation stateid. The nfs4_client holds references to these
107 * and they are put when it is being destroyed or when the delegation is
108 * returned by the client:
109 *
110 * o 1 reference as long as a delegation is still in force (taken when it's
111 * alloc'd, put when it's returned or revoked)
112 *
113 * o 1 reference as long as a recall rpc is in progress (taken when the lease
114 * is broken, put when the rpc exits)
115 *
116 * o 1 more ephemeral reference for each nfsd thread currently doing something
117 * with that delegation without holding the cl_lock
118 *
119 * If the server attempts to recall a delegation and the client doesn't do so
120 * before a timeout, the server may also revoke the delegation. In that case,
121 * the object will either be destroyed (v4.0) or moved to a per-client list of
122 * revoked delegations (v4.1+).
123 *
124 * This object is a superset of the nfs4_stid.
125 */
126 struct nfs4_delegation {
127 struct nfs4_stid dl_stid; /* must be first field */
128 struct list_head dl_perfile;
129 struct list_head dl_perclnt;
130 struct list_head dl_recall_lru; /* delegation recalled */
131 struct nfs4_clnt_odstate *dl_clnt_odstate;
132 u32 dl_type;
133 time_t dl_time;
134 /* For recall: */
135 int dl_retries;
136 struct nfsd4_callback dl_recall;
137 };
138
139 #define cb_to_delegation(cb) \
140 container_of(cb, struct nfs4_delegation, dl_recall)
141
142 /* client delegation callback info */
143 struct nfs4_cb_conn {
144 /* SETCLIENTID info */
145 struct sockaddr_storage cb_addr;
146 struct sockaddr_storage cb_saddr;
147 size_t cb_addrlen;
148 u32 cb_prog; /* used only in 4.0 case;
149 per-session otherwise */
150 u32 cb_ident; /* minorversion 0 only */
151 struct svc_xprt *cb_xprt; /* minorversion 1 only */
152 };
153
delegstateid(struct nfs4_stid * s)154 static inline struct nfs4_delegation *delegstateid(struct nfs4_stid *s)
155 {
156 return container_of(s, struct nfs4_delegation, dl_stid);
157 }
158
159 /* Maximum number of slots per session. 160 is useful for long haul TCP */
160 #define NFSD_MAX_SLOTS_PER_SESSION 160
161 /* Maximum number of operations per session compound */
162 #define NFSD_MAX_OPS_PER_COMPOUND 16
163 /* Maximum session per slot cache size */
164 #define NFSD_SLOT_CACHE_SIZE 2048
165 /* Maximum number of NFSD_SLOT_CACHE_SIZE slots per session */
166 #define NFSD_CACHE_SIZE_SLOTS_PER_SESSION 32
167 #define NFSD_MAX_MEM_PER_SESSION \
168 (NFSD_CACHE_SIZE_SLOTS_PER_SESSION * NFSD_SLOT_CACHE_SIZE)
169
170 struct nfsd4_slot {
171 u32 sl_seqid;
172 __be32 sl_status;
173 struct svc_cred sl_cred;
174 u32 sl_datalen;
175 u16 sl_opcnt;
176 #define NFSD4_SLOT_INUSE (1 << 0)
177 #define NFSD4_SLOT_CACHETHIS (1 << 1)
178 #define NFSD4_SLOT_INITIALIZED (1 << 2)
179 #define NFSD4_SLOT_CACHED (1 << 3)
180 u8 sl_flags;
181 char sl_data[];
182 };
183
184 struct nfsd4_channel_attrs {
185 u32 headerpadsz;
186 u32 maxreq_sz;
187 u32 maxresp_sz;
188 u32 maxresp_cached;
189 u32 maxops;
190 u32 maxreqs;
191 u32 nr_rdma_attrs;
192 u32 rdma_attrs;
193 };
194
195 struct nfsd4_cb_sec {
196 u32 flavor; /* (u32)(-1) used to mean "no valid flavor" */
197 kuid_t uid;
198 kgid_t gid;
199 };
200
201 struct nfsd4_create_session {
202 clientid_t clientid;
203 struct nfs4_sessionid sessionid;
204 u32 seqid;
205 u32 flags;
206 struct nfsd4_channel_attrs fore_channel;
207 struct nfsd4_channel_attrs back_channel;
208 u32 callback_prog;
209 struct nfsd4_cb_sec cb_sec;
210 };
211
212 struct nfsd4_backchannel_ctl {
213 u32 bc_cb_program;
214 struct nfsd4_cb_sec bc_cb_sec;
215 };
216
217 struct nfsd4_bind_conn_to_session {
218 struct nfs4_sessionid sessionid;
219 u32 dir;
220 };
221
222 /* The single slot clientid cache structure */
223 struct nfsd4_clid_slot {
224 u32 sl_seqid;
225 __be32 sl_status;
226 struct nfsd4_create_session sl_cr_ses;
227 };
228
229 struct nfsd4_conn {
230 struct list_head cn_persession;
231 struct svc_xprt *cn_xprt;
232 struct svc_xpt_user cn_xpt_user;
233 struct nfsd4_session *cn_session;
234 /* CDFC4_FORE, CDFC4_BACK: */
235 unsigned char cn_flags;
236 };
237
238 /*
239 * Representation of a v4.1+ session. These are refcounted in a similar fashion
240 * to the nfs4_client. References are only taken when the server is actively
241 * working on the object (primarily during the processing of compounds).
242 */
243 struct nfsd4_session {
244 atomic_t se_ref;
245 struct list_head se_hash; /* hash by sessionid */
246 struct list_head se_perclnt;
247 /* See SESSION4_PERSIST, etc. for standard flags; this is internal-only: */
248 #define NFS4_SESSION_DEAD 0x010
249 u32 se_flags;
250 struct nfs4_client *se_client;
251 struct nfs4_sessionid se_sessionid;
252 struct nfsd4_channel_attrs se_fchannel;
253 struct nfsd4_channel_attrs se_bchannel;
254 struct nfsd4_cb_sec se_cb_sec;
255 struct list_head se_conns;
256 u32 se_cb_prog;
257 u32 se_cb_seq_nr;
258 struct nfsd4_slot *se_slots[]; /* forward channel slots */
259 };
260
261 /* formatted contents of nfs4_sessionid */
262 struct nfsd4_sessionid {
263 clientid_t clientid;
264 u32 sequence;
265 u32 reserved;
266 };
267
268 #define HEXDIR_LEN 33 /* hex version of 16 byte md5 of cl_name plus '\0' */
269
270 /*
271 * struct nfs4_client - one per client. Clientids live here.
272 *
273 * The initial object created by an NFS client using SETCLIENTID (for NFSv4.0)
274 * or EXCHANGE_ID (for NFSv4.1+). These objects are refcounted and timestamped.
275 * Each nfsd_net_ns object contains a set of these and they are tracked via
276 * short and long form clientid. They are hashed and searched for under the
277 * per-nfsd_net client_lock spinlock.
278 *
279 * References to it are only held during the processing of compounds, and in
280 * certain other operations. In their "resting state" they have a refcount of
281 * 0. If they are not renewed within a lease period, they become eligible for
282 * destruction by the laundromat.
283 *
284 * These objects can also be destroyed prematurely by the fault injection code,
285 * or if the client sends certain forms of SETCLIENTID or EXCHANGE_ID updates.
286 * Care is taken *not* to do this however when the objects have an elevated
287 * refcount.
288 *
289 * o Each nfs4_client is hashed by clientid
290 *
291 * o Each nfs4_clients is also hashed by name (the opaque quantity initially
292 * sent by the client to identify itself).
293 *
294 * o cl_perclient list is used to ensure no dangling stateowner references
295 * when we expire the nfs4_client
296 */
297 struct nfs4_client {
298 struct list_head cl_idhash; /* hash by cl_clientid.id */
299 struct rb_node cl_namenode; /* link into by-name trees */
300 struct list_head *cl_ownerstr_hashtbl;
301 struct list_head cl_openowners;
302 struct idr cl_stateids; /* stateid lookup */
303 struct list_head cl_delegations;
304 struct list_head cl_revoked; /* unacknowledged, revoked 4.1 state */
305 struct list_head cl_lru; /* tail queue */
306 #ifdef CONFIG_NFSD_PNFS
307 struct list_head cl_lo_states; /* outstanding layout states */
308 #endif
309 struct xdr_netobj cl_name; /* id generated by client */
310 nfs4_verifier cl_verifier; /* generated by client */
311 time_t cl_time; /* time of last lease renewal */
312 struct sockaddr_storage cl_addr; /* client ipaddress */
313 bool cl_mach_cred; /* SP4_MACH_CRED in force */
314 struct svc_cred cl_cred; /* setclientid principal */
315 clientid_t cl_clientid; /* generated by server */
316 nfs4_verifier cl_confirm; /* generated by server */
317 u32 cl_minorversion;
318
319 /* for v4.0 and v4.1 callbacks: */
320 struct nfs4_cb_conn cl_cb_conn;
321 #define NFSD4_CLIENT_CB_UPDATE (0)
322 #define NFSD4_CLIENT_CB_KILL (1)
323 #define NFSD4_CLIENT_STABLE (2) /* client on stable storage */
324 #define NFSD4_CLIENT_RECLAIM_COMPLETE (3) /* reclaim_complete done */
325 #define NFSD4_CLIENT_CONFIRMED (4) /* client is confirmed */
326 #define NFSD4_CLIENT_UPCALL_LOCK (5) /* upcall serialization */
327 #define NFSD4_CLIENT_CB_FLAG_MASK (1 << NFSD4_CLIENT_CB_UPDATE | \
328 1 << NFSD4_CLIENT_CB_KILL)
329 unsigned long cl_flags;
330 struct rpc_cred *cl_cb_cred;
331 struct rpc_clnt *cl_cb_client;
332 u32 cl_cb_ident;
333 #define NFSD4_CB_UP 0
334 #define NFSD4_CB_UNKNOWN 1
335 #define NFSD4_CB_DOWN 2
336 #define NFSD4_CB_FAULT 3
337 int cl_cb_state;
338 struct nfsd4_callback cl_cb_null;
339 struct nfsd4_session *cl_cb_session;
340
341 /* for all client information that callback code might need: */
342 spinlock_t cl_lock;
343
344 /* for nfs41 */
345 struct list_head cl_sessions;
346 struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
347 u32 cl_exchange_flags;
348 /* number of rpc's in progress over an associated session: */
349 atomic_t cl_refcount;
350 struct nfs4_op_map cl_spo_must_allow;
351
352 /* for nfs41 callbacks */
353 /* We currently support a single back channel with a single slot */
354 unsigned long cl_cb_slot_busy;
355 struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */
356 /* wait here for slots */
357 struct net *net;
358 };
359
360 /* struct nfs4_client_reset
361 * one per old client. Populates reset_str_hashtbl. Filled from conf_id_hashtbl
362 * upon lease reset, or from upcall to state_daemon (to read in state
363 * from non-volitile storage) upon reboot.
364 */
365 struct nfs4_client_reclaim {
366 struct list_head cr_strhash; /* hash by cr_name */
367 struct nfs4_client *cr_clp; /* pointer to associated clp */
368 char cr_recdir[HEXDIR_LEN]; /* recover dir */
369 };
370
371 /* A reasonable value for REPLAY_ISIZE was estimated as follows:
372 * The OPEN response, typically the largest, requires
373 * 4(status) + 8(stateid) + 20(changeinfo) + 4(rflags) + 8(verifier) +
374 * 4(deleg. type) + 8(deleg. stateid) + 4(deleg. recall flag) +
375 * 20(deleg. space limit) + ~32(deleg. ace) = 112 bytes
376 */
377
378 #define NFSD4_REPLAY_ISIZE 112
379
380 /*
381 * Replay buffer, where the result of the last seqid-mutating operation
382 * is cached.
383 */
384 struct nfs4_replay {
385 __be32 rp_status;
386 unsigned int rp_buflen;
387 char *rp_buf;
388 struct knfsd_fh rp_openfh;
389 struct mutex rp_mutex;
390 char rp_ibuf[NFSD4_REPLAY_ISIZE];
391 };
392
393 struct nfs4_stateowner;
394
395 struct nfs4_stateowner_operations {
396 void (*so_unhash)(struct nfs4_stateowner *);
397 void (*so_free)(struct nfs4_stateowner *);
398 };
399
400 /*
401 * A core object that represents either an open or lock owner. The object and
402 * lock owner objects have one of these embedded within them. Refcounts and
403 * other fields common to both owner types are contained within these
404 * structures.
405 */
406 struct nfs4_stateowner {
407 struct list_head so_strhash;
408 struct list_head so_stateids;
409 struct nfs4_client *so_client;
410 const struct nfs4_stateowner_operations *so_ops;
411 /* after increment in nfsd4_bump_seqid, represents the next
412 * sequence id expected from the client: */
413 atomic_t so_count;
414 u32 so_seqid;
415 struct xdr_netobj so_owner; /* open owner name */
416 struct nfs4_replay so_replay;
417 bool so_is_open_owner;
418 };
419
420 /*
421 * When a file is opened, the client provides an open state owner opaque string
422 * that indicates the "owner" of that open. These objects are refcounted.
423 * References to it are held by each open state associated with it. This object
424 * is a superset of the nfs4_stateowner struct.
425 */
426 struct nfs4_openowner {
427 struct nfs4_stateowner oo_owner; /* must be first field */
428 struct list_head oo_perclient;
429 /*
430 * We keep around openowners a little while after last close,
431 * which saves clients from having to confirm, and allows us to
432 * handle close replays if they come soon enough. The close_lru
433 * is a list of such openowners, to be reaped by the laundromat
434 * thread eventually if they remain unused:
435 */
436 struct list_head oo_close_lru;
437 struct nfs4_ol_stateid *oo_last_closed_stid;
438 time_t oo_time; /* time of placement on so_close_lru */
439 #define NFS4_OO_CONFIRMED 1
440 unsigned char oo_flags;
441 };
442
443 /*
444 * Represents a generic "lockowner". Similar to an openowner. References to it
445 * are held by the lock stateids that are created on its behalf. This object is
446 * a superset of the nfs4_stateowner struct.
447 */
448 struct nfs4_lockowner {
449 struct nfs4_stateowner lo_owner; /* must be first element */
450 struct list_head lo_blocked; /* blocked file_locks */
451 };
452
openowner(struct nfs4_stateowner * so)453 static inline struct nfs4_openowner * openowner(struct nfs4_stateowner *so)
454 {
455 return container_of(so, struct nfs4_openowner, oo_owner);
456 }
457
lockowner(struct nfs4_stateowner * so)458 static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
459 {
460 return container_of(so, struct nfs4_lockowner, lo_owner);
461 }
462
463 /*
464 * Per-client state indicating no. of opens and outstanding delegations
465 * on a file from a particular client.'od' stands for 'open & delegation'
466 */
467 struct nfs4_clnt_odstate {
468 struct nfs4_client *co_client;
469 struct nfs4_file *co_file;
470 struct list_head co_perfile;
471 refcount_t co_odcount;
472 };
473
474 /*
475 * nfs4_file: a file opened by some number of (open) nfs4_stateowners.
476 *
477 * These objects are global. nfsd keeps one instance of a nfs4_file per
478 * filehandle (though it may keep multiple file descriptors for each). Each
479 * inode can have multiple filehandles associated with it, so there is
480 * (potentially) a many to one relationship between this struct and struct
481 * inode.
482 *
483 * These are hashed by filehandle in the file_hashtbl, which is protected by
484 * the global state_lock spinlock.
485 */
486 struct nfs4_file {
487 refcount_t fi_ref;
488 spinlock_t fi_lock;
489 struct hlist_node fi_hash; /* hash on fi_fhandle */
490 struct list_head fi_stateids;
491 union {
492 struct list_head fi_delegations;
493 struct rcu_head fi_rcu;
494 };
495 struct list_head fi_clnt_odstate;
496 /* One each for O_RDONLY, O_WRONLY, O_RDWR: */
497 struct file * fi_fds[3];
498 /*
499 * Each open or lock stateid contributes 0-4 to the counts
500 * below depending on which bits are set in st_access_bitmap:
501 * 1 to fi_access[O_RDONLY] if NFS4_SHARE_ACCES_READ is set
502 * + 1 to fi_access[O_WRONLY] if NFS4_SHARE_ACCESS_WRITE is set
503 * + 1 to both of the above if NFS4_SHARE_ACCESS_BOTH is set.
504 */
505 atomic_t fi_access[2];
506 u32 fi_share_deny;
507 struct file *fi_deleg_file;
508 int fi_delegees;
509 struct knfsd_fh fi_fhandle;
510 bool fi_had_conflict;
511 #ifdef CONFIG_NFSD_PNFS
512 struct list_head fi_lo_states;
513 atomic_t fi_lo_recalls;
514 #endif
515 };
516
517 /*
518 * A generic struct representing either a open or lock stateid. The nfs4_client
519 * holds a reference to each of these objects, and they in turn hold a
520 * reference to their respective stateowners. The client's reference is
521 * released in response to a close or unlock (depending on whether it's an open
522 * or lock stateid) or when the client is being destroyed.
523 *
524 * In the case of v4.0 open stateids, these objects are preserved for a little
525 * while after close in order to handle CLOSE replays. Those are eventually
526 * reclaimed via a LRU scheme by the laundromat.
527 *
528 * This object is a superset of the nfs4_stid. "ol" stands for "Open or Lock".
529 * Better suggestions welcome.
530 */
531 struct nfs4_ol_stateid {
532 struct nfs4_stid st_stid;
533 struct list_head st_perfile;
534 struct list_head st_perstateowner;
535 struct list_head st_locks;
536 struct nfs4_stateowner *st_stateowner;
537 struct nfs4_clnt_odstate *st_clnt_odstate;
538 unsigned char st_access_bmap;
539 unsigned char st_deny_bmap;
540 struct nfs4_ol_stateid *st_openstp;
541 struct mutex st_mutex;
542 };
543
openlockstateid(struct nfs4_stid * s)544 static inline struct nfs4_ol_stateid *openlockstateid(struct nfs4_stid *s)
545 {
546 return container_of(s, struct nfs4_ol_stateid, st_stid);
547 }
548
549 struct nfs4_layout_stateid {
550 struct nfs4_stid ls_stid;
551 struct list_head ls_perclnt;
552 struct list_head ls_perfile;
553 spinlock_t ls_lock;
554 struct list_head ls_layouts;
555 u32 ls_layout_type;
556 struct file *ls_file;
557 struct nfsd4_callback ls_recall;
558 stateid_t ls_recall_sid;
559 bool ls_recalled;
560 struct mutex ls_mutex;
561 };
562
layoutstateid(struct nfs4_stid * s)563 static inline struct nfs4_layout_stateid *layoutstateid(struct nfs4_stid *s)
564 {
565 return container_of(s, struct nfs4_layout_stateid, ls_stid);
566 }
567
568 /* flags for preprocess_seqid_op() */
569 #define RD_STATE 0x00000010
570 #define WR_STATE 0x00000020
571
572 enum nfsd4_cb_op {
573 NFSPROC4_CLNT_CB_NULL = 0,
574 NFSPROC4_CLNT_CB_RECALL,
575 NFSPROC4_CLNT_CB_LAYOUT,
576 NFSPROC4_CLNT_CB_SEQUENCE,
577 NFSPROC4_CLNT_CB_NOTIFY_LOCK,
578 };
579
580 /* Returns true iff a is later than b: */
nfsd4_stateid_generation_after(stateid_t * a,stateid_t * b)581 static inline bool nfsd4_stateid_generation_after(stateid_t *a, stateid_t *b)
582 {
583 return (s32)(a->si_generation - b->si_generation) > 0;
584 }
585
586 /*
587 * When a client tries to get a lock on a file, we set one of these objects
588 * on the blocking lock. When the lock becomes free, we can then issue a
589 * CB_NOTIFY_LOCK to the server.
590 */
591 struct nfsd4_blocked_lock {
592 struct list_head nbl_list;
593 struct list_head nbl_lru;
594 unsigned long nbl_time;
595 struct file_lock nbl_lock;
596 struct knfsd_fh nbl_fh;
597 struct nfsd4_callback nbl_cb;
598 };
599
600 struct nfsd4_compound_state;
601 struct nfsd_net;
602
603 extern __be32 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
604 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
605 stateid_t *stateid, int flags, struct file **filp, bool *tmp_file);
606 __be32 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
607 stateid_t *stateid, unsigned char typemask,
608 struct nfs4_stid **s, struct nfsd_net *nn);
609 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
610 void (*sc_free)(struct nfs4_stid *));
611 void nfs4_unhash_stid(struct nfs4_stid *s);
612 void nfs4_put_stid(struct nfs4_stid *s);
613 void nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid);
614 void nfs4_remove_reclaim_record(struct nfs4_client_reclaim *, struct nfsd_net *);
615 extern void nfs4_release_reclaim(struct nfsd_net *);
616 extern struct nfs4_client_reclaim *nfsd4_find_reclaim_client(const char *recdir,
617 struct nfsd_net *nn);
618 extern __be32 nfs4_check_open_reclaim(clientid_t *clid,
619 struct nfsd4_compound_state *cstate, struct nfsd_net *nn);
620 extern void nfsd4_probe_callback(struct nfs4_client *clp);
621 extern void nfsd4_probe_callback_sync(struct nfs4_client *clp);
622 extern void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *);
623 extern void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp,
624 const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op);
625 extern void nfsd4_run_cb(struct nfsd4_callback *cb);
626 extern int nfsd4_create_callback_queue(void);
627 extern void nfsd4_destroy_callback_queue(void);
628 extern void nfsd4_shutdown_callback(struct nfs4_client *);
629 extern void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp);
630 extern struct nfs4_client_reclaim *nfs4_client_to_reclaim(const char *name,
631 struct nfsd_net *nn);
632 extern bool nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn);
633
634 struct nfs4_file *find_file(struct knfsd_fh *fh);
635 void put_nfs4_file(struct nfs4_file *fi);
get_nfs4_file(struct nfs4_file * fi)636 static inline void get_nfs4_file(struct nfs4_file *fi)
637 {
638 refcount_inc(&fi->fi_ref);
639 }
640 struct file *find_any_file(struct nfs4_file *f);
641
642 /* grace period management */
643 void nfsd4_end_grace(struct nfsd_net *nn);
644
645 /* nfs4recover operations */
646 extern int nfsd4_client_tracking_init(struct net *net);
647 extern void nfsd4_client_tracking_exit(struct net *net);
648 extern void nfsd4_client_record_create(struct nfs4_client *clp);
649 extern void nfsd4_client_record_remove(struct nfs4_client *clp);
650 extern int nfsd4_client_record_check(struct nfs4_client *clp);
651 extern void nfsd4_record_grace_done(struct nfsd_net *nn);
652
653 /* nfs fault injection functions */
654 #ifdef CONFIG_NFSD_FAULT_INJECTION
655 int nfsd_fault_inject_init(void);
656 void nfsd_fault_inject_cleanup(void);
657
658 u64 nfsd_inject_print_clients(void);
659 u64 nfsd_inject_forget_client(struct sockaddr_storage *, size_t);
660 u64 nfsd_inject_forget_clients(u64);
661
662 u64 nfsd_inject_print_locks(void);
663 u64 nfsd_inject_forget_client_locks(struct sockaddr_storage *, size_t);
664 u64 nfsd_inject_forget_locks(u64);
665
666 u64 nfsd_inject_print_openowners(void);
667 u64 nfsd_inject_forget_client_openowners(struct sockaddr_storage *, size_t);
668 u64 nfsd_inject_forget_openowners(u64);
669
670 u64 nfsd_inject_print_delegations(void);
671 u64 nfsd_inject_forget_client_delegations(struct sockaddr_storage *, size_t);
672 u64 nfsd_inject_forget_delegations(u64);
673 u64 nfsd_inject_recall_client_delegations(struct sockaddr_storage *, size_t);
674 u64 nfsd_inject_recall_delegations(u64);
675 #else /* CONFIG_NFSD_FAULT_INJECTION */
nfsd_fault_inject_init(void)676 static inline int nfsd_fault_inject_init(void) { return 0; }
nfsd_fault_inject_cleanup(void)677 static inline void nfsd_fault_inject_cleanup(void) {}
678 #endif /* CONFIG_NFSD_FAULT_INJECTION */
679
680 #endif /* NFSD4_STATE_H */
681
