1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2014 Christoph Hellwig.
4 */
5 #include <linux/blkdev.h>
6 #include <linux/kmod.h>
7 #include <linux/file.h>
8 #include <linux/jhash.h>
9 #include <linux/sched.h>
10 #include <linux/sunrpc/addr.h>
11
12 #include "pnfs.h"
13 #include "netns.h"
14 #include "trace.h"
15
16 #define NFSDDBG_FACILITY NFSDDBG_PNFS
17
18 struct nfs4_layout {
19 struct list_head lo_perstate;
20 struct nfs4_layout_stateid *lo_state;
21 struct nfsd4_layout_seg lo_seg;
22 };
23
24 static struct kmem_cache *nfs4_layout_cache;
25 static struct kmem_cache *nfs4_layout_stateid_cache;
26
27 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops;
28 static const struct lock_manager_operations nfsd4_layouts_lm_ops;
29
30 const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {
31 #ifdef CONFIG_NFSD_FLEXFILELAYOUT
32 [LAYOUT_FLEX_FILES] = &ff_layout_ops,
33 #endif
34 #ifdef CONFIG_NFSD_BLOCKLAYOUT
35 [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
36 #endif
37 #ifdef CONFIG_NFSD_SCSILAYOUT
38 [LAYOUT_SCSI] = &scsi_layout_ops,
39 #endif
40 };
41
42 /* pNFS device ID to export fsid mapping */
43 #define DEVID_HASH_BITS 8
44 #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS)
45 #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1)
46 static u64 nfsd_devid_seq = 1;
47 static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];
48 static DEFINE_SPINLOCK(nfsd_devid_lock);
49
devid_hashfn(u64 idx)50 static inline u32 devid_hashfn(u64 idx)
51 {
52 return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;
53 }
54
55 static void
nfsd4_alloc_devid_map(const struct svc_fh * fhp)56 nfsd4_alloc_devid_map(const struct svc_fh *fhp)
57 {
58 const struct knfsd_fh *fh = &fhp->fh_handle;
59 size_t fsid_len = key_len(fh->fh_fsid_type);
60 struct nfsd4_deviceid_map *map, *old;
61 int i;
62
63 map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL);
64 if (!map)
65 return;
66
67 map->fsid_type = fh->fh_fsid_type;
68 memcpy(&map->fsid, fh->fh_fsid, fsid_len);
69
70 spin_lock(&nfsd_devid_lock);
71 if (fhp->fh_export->ex_devid_map)
72 goto out_unlock;
73
74 for (i = 0; i < DEVID_HASH_SIZE; i++) {
75 list_for_each_entry(old, &nfsd_devid_hash[i], hash) {
76 if (old->fsid_type != fh->fh_fsid_type)
77 continue;
78 if (memcmp(old->fsid, fh->fh_fsid,
79 key_len(old->fsid_type)))
80 continue;
81
82 fhp->fh_export->ex_devid_map = old;
83 goto out_unlock;
84 }
85 }
86
87 map->idx = nfsd_devid_seq++;
88 list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]);
89 fhp->fh_export->ex_devid_map = map;
90 map = NULL;
91
92 out_unlock:
93 spin_unlock(&nfsd_devid_lock);
94 kfree(map);
95 }
96
97 struct nfsd4_deviceid_map *
nfsd4_find_devid_map(int idx)98 nfsd4_find_devid_map(int idx)
99 {
100 struct nfsd4_deviceid_map *map, *ret = NULL;
101
102 rcu_read_lock();
103 list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash)
104 if (map->idx == idx)
105 ret = map;
106 rcu_read_unlock();
107
108 return ret;
109 }
110
111 int
nfsd4_set_deviceid(struct nfsd4_deviceid * id,const struct svc_fh * fhp,u32 device_generation)112 nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
113 u32 device_generation)
114 {
115 if (!fhp->fh_export->ex_devid_map) {
116 nfsd4_alloc_devid_map(fhp);
117 if (!fhp->fh_export->ex_devid_map)
118 return -ENOMEM;
119 }
120
121 id->fsid_idx = fhp->fh_export->ex_devid_map->idx;
122 id->generation = device_generation;
123 id->pad = 0;
124 return 0;
125 }
126
nfsd4_setup_layout_type(struct svc_export * exp)127 void nfsd4_setup_layout_type(struct svc_export *exp)
128 {
129 #if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT)
130 struct super_block *sb = exp->ex_path.mnt->mnt_sb;
131 #endif
132
133 if (!(exp->ex_flags & NFSEXP_PNFS))
134 return;
135
136 #ifdef CONFIG_NFSD_FLEXFILELAYOUT
137 exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
138 #endif
139 #ifdef CONFIG_NFSD_BLOCKLAYOUT
140 if (sb->s_export_op->get_uuid &&
141 sb->s_export_op->map_blocks &&
142 sb->s_export_op->commit_blocks)
143 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME;
144 #endif
145 #ifdef CONFIG_NFSD_SCSILAYOUT
146 if (sb->s_export_op->map_blocks &&
147 sb->s_export_op->commit_blocks &&
148 sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops &&
149 blk_queue_scsi_passthrough(sb->s_bdev->bd_disk->queue))
150 exp->ex_layout_types |= 1 << LAYOUT_SCSI;
151 #endif
152 }
153
154 static void
nfsd4_free_layout_stateid(struct nfs4_stid * stid)155 nfsd4_free_layout_stateid(struct nfs4_stid *stid)
156 {
157 struct nfs4_layout_stateid *ls = layoutstateid(stid);
158 struct nfs4_client *clp = ls->ls_stid.sc_client;
159 struct nfs4_file *fp = ls->ls_stid.sc_file;
160
161 trace_nfsd_layoutstate_free(&ls->ls_stid.sc_stateid);
162
163 spin_lock(&clp->cl_lock);
164 list_del_init(&ls->ls_perclnt);
165 spin_unlock(&clp->cl_lock);
166
167 spin_lock(&fp->fi_lock);
168 list_del_init(&ls->ls_perfile);
169 spin_unlock(&fp->fi_lock);
170
171 if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
172 vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls);
173 nfsd_file_put(ls->ls_file);
174
175 if (ls->ls_recalled)
176 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
177
178 kmem_cache_free(nfs4_layout_stateid_cache, ls);
179 }
180
181 static int
nfsd4_layout_setlease(struct nfs4_layout_stateid * ls)182 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
183 {
184 struct file_lock *fl;
185 int status;
186
187 if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
188 return 0;
189
190 fl = locks_alloc_lock();
191 if (!fl)
192 return -ENOMEM;
193 locks_init_lock(fl);
194 fl->fl_lmops = &nfsd4_layouts_lm_ops;
195 fl->fl_flags = FL_LAYOUT;
196 fl->fl_type = F_RDLCK;
197 fl->fl_end = OFFSET_MAX;
198 fl->fl_owner = ls;
199 fl->fl_pid = current->tgid;
200 fl->fl_file = ls->ls_file->nf_file;
201
202 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
203 if (status) {
204 locks_free_lock(fl);
205 return status;
206 }
207 BUG_ON(fl != NULL);
208 return 0;
209 }
210
211 static struct nfs4_layout_stateid *
nfsd4_alloc_layout_stateid(struct nfsd4_compound_state * cstate,struct nfs4_stid * parent,u32 layout_type)212 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
213 struct nfs4_stid *parent, u32 layout_type)
214 {
215 struct nfs4_client *clp = cstate->clp;
216 struct nfs4_file *fp = parent->sc_file;
217 struct nfs4_layout_stateid *ls;
218 struct nfs4_stid *stp;
219
220 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache,
221 nfsd4_free_layout_stateid);
222 if (!stp)
223 return NULL;
224
225 get_nfs4_file(fp);
226 stp->sc_file = fp;
227
228 ls = layoutstateid(stp);
229 INIT_LIST_HEAD(&ls->ls_perclnt);
230 INIT_LIST_HEAD(&ls->ls_perfile);
231 spin_lock_init(&ls->ls_lock);
232 INIT_LIST_HEAD(&ls->ls_layouts);
233 mutex_init(&ls->ls_mutex);
234 ls->ls_layout_type = layout_type;
235 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
236 NFSPROC4_CLNT_CB_LAYOUT);
237
238 if (parent->sc_type == NFS4_DELEG_STID)
239 ls->ls_file = nfsd_file_get(fp->fi_deleg_file);
240 else
241 ls->ls_file = find_any_file(fp);
242 BUG_ON(!ls->ls_file);
243
244 if (nfsd4_layout_setlease(ls)) {
245 nfsd_file_put(ls->ls_file);
246 put_nfs4_file(fp);
247 kmem_cache_free(nfs4_layout_stateid_cache, ls);
248 return NULL;
249 }
250
251 spin_lock(&clp->cl_lock);
252 stp->sc_type = NFS4_LAYOUT_STID;
253 list_add(&ls->ls_perclnt, &clp->cl_lo_states);
254 spin_unlock(&clp->cl_lock);
255
256 spin_lock(&fp->fi_lock);
257 list_add(&ls->ls_perfile, &fp->fi_lo_states);
258 spin_unlock(&fp->fi_lock);
259
260 trace_nfsd_layoutstate_alloc(&ls->ls_stid.sc_stateid);
261 return ls;
262 }
263
264 __be32
nfsd4_preprocess_layout_stateid(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,stateid_t * stateid,bool create,u32 layout_type,struct nfs4_layout_stateid ** lsp)265 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
266 struct nfsd4_compound_state *cstate, stateid_t *stateid,
267 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
268 {
269 struct nfs4_layout_stateid *ls;
270 struct nfs4_stid *stid;
271 unsigned char typemask = NFS4_LAYOUT_STID;
272 __be32 status;
273
274 if (create)
275 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
276
277 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
278 net_generic(SVC_NET(rqstp), nfsd_net_id));
279 if (status)
280 goto out;
281
282 if (!fh_match(&cstate->current_fh.fh_handle,
283 &stid->sc_file->fi_fhandle)) {
284 status = nfserr_bad_stateid;
285 goto out_put_stid;
286 }
287
288 if (stid->sc_type != NFS4_LAYOUT_STID) {
289 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
290 nfs4_put_stid(stid);
291
292 status = nfserr_jukebox;
293 if (!ls)
294 goto out;
295 mutex_lock(&ls->ls_mutex);
296 } else {
297 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
298
299 status = nfserr_bad_stateid;
300 mutex_lock(&ls->ls_mutex);
301 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
302 goto out_unlock_stid;
303 if (layout_type != ls->ls_layout_type)
304 goto out_unlock_stid;
305 }
306
307 *lsp = ls;
308 return 0;
309
310 out_unlock_stid:
311 mutex_unlock(&ls->ls_mutex);
312 out_put_stid:
313 nfs4_put_stid(stid);
314 out:
315 return status;
316 }
317
318 static void
nfsd4_recall_file_layout(struct nfs4_layout_stateid * ls)319 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
320 {
321 spin_lock(&ls->ls_lock);
322 if (ls->ls_recalled)
323 goto out_unlock;
324
325 ls->ls_recalled = true;
326 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
327 if (list_empty(&ls->ls_layouts))
328 goto out_unlock;
329
330 trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid);
331
332 refcount_inc(&ls->ls_stid.sc_count);
333 nfsd4_run_cb(&ls->ls_recall);
334
335 out_unlock:
336 spin_unlock(&ls->ls_lock);
337 }
338
339 static inline u64
layout_end(struct nfsd4_layout_seg * seg)340 layout_end(struct nfsd4_layout_seg *seg)
341 {
342 u64 end = seg->offset + seg->length;
343 return end >= seg->offset ? end : NFS4_MAX_UINT64;
344 }
345
346 static void
layout_update_len(struct nfsd4_layout_seg * lo,u64 end)347 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
348 {
349 if (end == NFS4_MAX_UINT64)
350 lo->length = NFS4_MAX_UINT64;
351 else
352 lo->length = end - lo->offset;
353 }
354
355 static bool
layouts_overlapping(struct nfs4_layout * lo,struct nfsd4_layout_seg * s)356 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
357 {
358 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
359 return false;
360 if (layout_end(&lo->lo_seg) <= s->offset)
361 return false;
362 if (layout_end(s) <= lo->lo_seg.offset)
363 return false;
364 return true;
365 }
366
367 static bool
layouts_try_merge(struct nfsd4_layout_seg * lo,struct nfsd4_layout_seg * new)368 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
369 {
370 if (lo->iomode != new->iomode)
371 return false;
372 if (layout_end(new) < lo->offset)
373 return false;
374 if (layout_end(lo) < new->offset)
375 return false;
376
377 lo->offset = min(lo->offset, new->offset);
378 layout_update_len(lo, max(layout_end(lo), layout_end(new)));
379 return true;
380 }
381
382 static __be32
nfsd4_recall_conflict(struct nfs4_layout_stateid * ls)383 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
384 {
385 struct nfs4_file *fp = ls->ls_stid.sc_file;
386 struct nfs4_layout_stateid *l, *n;
387 __be32 nfserr = nfs_ok;
388
389 assert_spin_locked(&fp->fi_lock);
390
391 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
392 if (l != ls) {
393 nfsd4_recall_file_layout(l);
394 nfserr = nfserr_recallconflict;
395 }
396 }
397
398 return nfserr;
399 }
400
401 __be32
nfsd4_insert_layout(struct nfsd4_layoutget * lgp,struct nfs4_layout_stateid * ls)402 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
403 {
404 struct nfsd4_layout_seg *seg = &lgp->lg_seg;
405 struct nfs4_file *fp = ls->ls_stid.sc_file;
406 struct nfs4_layout *lp, *new = NULL;
407 __be32 nfserr;
408
409 spin_lock(&fp->fi_lock);
410 nfserr = nfsd4_recall_conflict(ls);
411 if (nfserr)
412 goto out;
413 spin_lock(&ls->ls_lock);
414 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
415 if (layouts_try_merge(&lp->lo_seg, seg))
416 goto done;
417 }
418 spin_unlock(&ls->ls_lock);
419 spin_unlock(&fp->fi_lock);
420
421 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
422 if (!new)
423 return nfserr_jukebox;
424 memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
425 new->lo_state = ls;
426
427 spin_lock(&fp->fi_lock);
428 nfserr = nfsd4_recall_conflict(ls);
429 if (nfserr)
430 goto out;
431 spin_lock(&ls->ls_lock);
432 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
433 if (layouts_try_merge(&lp->lo_seg, seg))
434 goto done;
435 }
436
437 refcount_inc(&ls->ls_stid.sc_count);
438 list_add_tail(&new->lo_perstate, &ls->ls_layouts);
439 new = NULL;
440 done:
441 nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
442 spin_unlock(&ls->ls_lock);
443 out:
444 spin_unlock(&fp->fi_lock);
445 if (new)
446 kmem_cache_free(nfs4_layout_cache, new);
447 return nfserr;
448 }
449
450 static void
nfsd4_free_layouts(struct list_head * reaplist)451 nfsd4_free_layouts(struct list_head *reaplist)
452 {
453 while (!list_empty(reaplist)) {
454 struct nfs4_layout *lp = list_first_entry(reaplist,
455 struct nfs4_layout, lo_perstate);
456
457 list_del(&lp->lo_perstate);
458 nfs4_put_stid(&lp->lo_state->ls_stid);
459 kmem_cache_free(nfs4_layout_cache, lp);
460 }
461 }
462
463 static void
nfsd4_return_file_layout(struct nfs4_layout * lp,struct nfsd4_layout_seg * seg,struct list_head * reaplist)464 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
465 struct list_head *reaplist)
466 {
467 struct nfsd4_layout_seg *lo = &lp->lo_seg;
468 u64 end = layout_end(lo);
469
470 if (seg->offset <= lo->offset) {
471 if (layout_end(seg) >= end) {
472 list_move_tail(&lp->lo_perstate, reaplist);
473 return;
474 }
475 lo->offset = layout_end(seg);
476 } else {
477 /* retain the whole layout segment on a split. */
478 if (layout_end(seg) < end) {
479 dprintk("%s: split not supported\n", __func__);
480 return;
481 }
482 end = seg->offset;
483 }
484
485 layout_update_len(lo, end);
486 }
487
488 __be32
nfsd4_return_file_layouts(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_layoutreturn * lrp)489 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
490 struct nfsd4_compound_state *cstate,
491 struct nfsd4_layoutreturn *lrp)
492 {
493 struct nfs4_layout_stateid *ls;
494 struct nfs4_layout *lp, *n;
495 LIST_HEAD(reaplist);
496 __be32 nfserr;
497 int found = 0;
498
499 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
500 false, lrp->lr_layout_type,
501 &ls);
502 if (nfserr) {
503 trace_nfsd_layout_return_lookup_fail(&lrp->lr_sid);
504 return nfserr;
505 }
506
507 spin_lock(&ls->ls_lock);
508 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
509 if (layouts_overlapping(lp, &lrp->lr_seg)) {
510 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
511 found++;
512 }
513 }
514 if (!list_empty(&ls->ls_layouts)) {
515 if (found)
516 nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
517 lrp->lrs_present = 1;
518 } else {
519 trace_nfsd_layoutstate_unhash(&ls->ls_stid.sc_stateid);
520 nfs4_unhash_stid(&ls->ls_stid);
521 lrp->lrs_present = 0;
522 }
523 spin_unlock(&ls->ls_lock);
524
525 mutex_unlock(&ls->ls_mutex);
526 nfs4_put_stid(&ls->ls_stid);
527 nfsd4_free_layouts(&reaplist);
528 return nfs_ok;
529 }
530
531 __be32
nfsd4_return_client_layouts(struct svc_rqst * rqstp,struct nfsd4_compound_state * cstate,struct nfsd4_layoutreturn * lrp)532 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
533 struct nfsd4_compound_state *cstate,
534 struct nfsd4_layoutreturn *lrp)
535 {
536 struct nfs4_layout_stateid *ls, *n;
537 struct nfs4_client *clp = cstate->clp;
538 struct nfs4_layout *lp, *t;
539 LIST_HEAD(reaplist);
540
541 lrp->lrs_present = 0;
542
543 spin_lock(&clp->cl_lock);
544 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
545 if (ls->ls_layout_type != lrp->lr_layout_type)
546 continue;
547
548 if (lrp->lr_return_type == RETURN_FSID &&
549 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
550 &cstate->current_fh.fh_handle))
551 continue;
552
553 spin_lock(&ls->ls_lock);
554 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
555 if (lrp->lr_seg.iomode == IOMODE_ANY ||
556 lrp->lr_seg.iomode == lp->lo_seg.iomode)
557 list_move_tail(&lp->lo_perstate, &reaplist);
558 }
559 spin_unlock(&ls->ls_lock);
560 }
561 spin_unlock(&clp->cl_lock);
562
563 nfsd4_free_layouts(&reaplist);
564 return 0;
565 }
566
567 static void
nfsd4_return_all_layouts(struct nfs4_layout_stateid * ls,struct list_head * reaplist)568 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
569 struct list_head *reaplist)
570 {
571 spin_lock(&ls->ls_lock);
572 list_splice_init(&ls->ls_layouts, reaplist);
573 spin_unlock(&ls->ls_lock);
574 }
575
576 void
nfsd4_return_all_client_layouts(struct nfs4_client * clp)577 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
578 {
579 struct nfs4_layout_stateid *ls, *n;
580 LIST_HEAD(reaplist);
581
582 spin_lock(&clp->cl_lock);
583 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
584 nfsd4_return_all_layouts(ls, &reaplist);
585 spin_unlock(&clp->cl_lock);
586
587 nfsd4_free_layouts(&reaplist);
588 }
589
590 void
nfsd4_return_all_file_layouts(struct nfs4_client * clp,struct nfs4_file * fp)591 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
592 {
593 struct nfs4_layout_stateid *ls, *n;
594 LIST_HEAD(reaplist);
595
596 spin_lock(&fp->fi_lock);
597 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
598 if (ls->ls_stid.sc_client == clp)
599 nfsd4_return_all_layouts(ls, &reaplist);
600 }
601 spin_unlock(&fp->fi_lock);
602
603 nfsd4_free_layouts(&reaplist);
604 }
605
606 static void
nfsd4_cb_layout_fail(struct nfs4_layout_stateid * ls)607 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
608 {
609 struct nfs4_client *clp = ls->ls_stid.sc_client;
610 char addr_str[INET6_ADDRSTRLEN];
611 static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
612 static char *envp[] = {
613 "HOME=/",
614 "TERM=linux",
615 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
616 NULL
617 };
618 char *argv[8];
619 int error;
620
621 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
622
623 printk(KERN_WARNING
624 "nfsd: client %s failed to respond to layout recall. "
625 " Fencing..\n", addr_str);
626
627 argv[0] = (char *)nfsd_recall_failed;
628 argv[1] = addr_str;
629 argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id;
630 argv[3] = NULL;
631
632 error = call_usermodehelper(nfsd_recall_failed, argv, envp,
633 UMH_WAIT_PROC);
634 if (error) {
635 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
636 addr_str, error);
637 }
638 }
639
640 static void
nfsd4_cb_layout_prepare(struct nfsd4_callback * cb)641 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
642 {
643 struct nfs4_layout_stateid *ls =
644 container_of(cb, struct nfs4_layout_stateid, ls_recall);
645
646 mutex_lock(&ls->ls_mutex);
647 nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
648 mutex_unlock(&ls->ls_mutex);
649 }
650
651 static int
nfsd4_cb_layout_done(struct nfsd4_callback * cb,struct rpc_task * task)652 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
653 {
654 struct nfs4_layout_stateid *ls =
655 container_of(cb, struct nfs4_layout_stateid, ls_recall);
656 struct nfsd_net *nn;
657 ktime_t now, cutoff;
658 const struct nfsd4_layout_ops *ops;
659
660
661 switch (task->tk_status) {
662 case 0:
663 case -NFS4ERR_DELAY:
664 /*
665 * Anything left? If not, then call it done. Note that we don't
666 * take the spinlock since this is an optimization and nothing
667 * should get added until the cb counter goes to zero.
668 */
669 if (list_empty(&ls->ls_layouts))
670 return 1;
671
672 /* Poll the client until it's done with the layout */
673 now = ktime_get();
674 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
675
676 /* Client gets 2 lease periods to return it */
677 cutoff = ktime_add_ns(task->tk_start,
678 nn->nfsd4_lease * NSEC_PER_SEC * 2);
679
680 if (ktime_before(now, cutoff)) {
681 rpc_delay(task, HZ/100); /* 10 mili-seconds */
682 return 0;
683 }
684 /* Fallthrough */
685 default:
686 /*
687 * Unknown error or non-responding client, we'll need to fence.
688 */
689 trace_nfsd_layout_recall_fail(&ls->ls_stid.sc_stateid);
690
691 ops = nfsd4_layout_ops[ls->ls_layout_type];
692 if (ops->fence_client)
693 ops->fence_client(ls);
694 else
695 nfsd4_cb_layout_fail(ls);
696 return 1;
697 case -NFS4ERR_NOMATCHING_LAYOUT:
698 trace_nfsd_layout_recall_done(&ls->ls_stid.sc_stateid);
699 task->tk_status = 0;
700 return 1;
701 }
702 }
703
704 static void
nfsd4_cb_layout_release(struct nfsd4_callback * cb)705 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
706 {
707 struct nfs4_layout_stateid *ls =
708 container_of(cb, struct nfs4_layout_stateid, ls_recall);
709 LIST_HEAD(reaplist);
710
711 trace_nfsd_layout_recall_release(&ls->ls_stid.sc_stateid);
712
713 nfsd4_return_all_layouts(ls, &reaplist);
714 nfsd4_free_layouts(&reaplist);
715 nfs4_put_stid(&ls->ls_stid);
716 }
717
718 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
719 .prepare = nfsd4_cb_layout_prepare,
720 .done = nfsd4_cb_layout_done,
721 .release = nfsd4_cb_layout_release,
722 };
723
724 static bool
nfsd4_layout_lm_break(struct file_lock * fl)725 nfsd4_layout_lm_break(struct file_lock *fl)
726 {
727 /*
728 * We don't want the locks code to timeout the lease for us;
729 * we'll remove it ourself if a layout isn't returned
730 * in time:
731 */
732 fl->fl_break_time = 0;
733 nfsd4_recall_file_layout(fl->fl_owner);
734 return false;
735 }
736
737 static int
nfsd4_layout_lm_change(struct file_lock * onlist,int arg,struct list_head * dispose)738 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
739 struct list_head *dispose)
740 {
741 BUG_ON(!(arg & F_UNLCK));
742 return lease_modify(onlist, arg, dispose);
743 }
744
745 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
746 .lm_break = nfsd4_layout_lm_break,
747 .lm_change = nfsd4_layout_lm_change,
748 };
749
750 int
nfsd4_init_pnfs(void)751 nfsd4_init_pnfs(void)
752 {
753 int i;
754
755 for (i = 0; i < DEVID_HASH_SIZE; i++)
756 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
757
758 nfs4_layout_cache = kmem_cache_create("nfs4_layout",
759 sizeof(struct nfs4_layout), 0, 0, NULL);
760 if (!nfs4_layout_cache)
761 return -ENOMEM;
762
763 nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
764 sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
765 if (!nfs4_layout_stateid_cache) {
766 kmem_cache_destroy(nfs4_layout_cache);
767 return -ENOMEM;
768 }
769 return 0;
770 }
771
772 void
nfsd4_exit_pnfs(void)773 nfsd4_exit_pnfs(void)
774 {
775 int i;
776
777 kmem_cache_destroy(nfs4_layout_cache);
778 kmem_cache_destroy(nfs4_layout_stateid_cache);
779
780 for (i = 0; i < DEVID_HASH_SIZE; i++) {
781 struct nfsd4_deviceid_map *map, *n;
782
783 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
784 kfree(map);
785 }
786 }
787
