7d888369f85a4194b0ddf0c2202bb693fe9cac99
[sfrench/cifs-2.6.git] / fs / nfsd / nfs4layouts.c
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
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
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 *
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
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
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         /*
137          * If flex file is configured, use it by default. Otherwise
138          * check if the file system supports exporting a block-like layout.
139          * If the block device supports reservations prefer the SCSI layout,
140          * otherwise advertise the block layout.
141          */
142 #ifdef CONFIG_NFSD_FLEXFILELAYOUT
143         exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES;
144 #endif
145 #ifdef CONFIG_NFSD_BLOCKLAYOUT
146         /* overwrite flex file layout selection if needed */
147         if (sb->s_export_op->get_uuid &&
148             sb->s_export_op->map_blocks &&
149             sb->s_export_op->commit_blocks)
150                 exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME;
151 #endif
152 #ifdef CONFIG_NFSD_SCSILAYOUT
153         /* overwrite block layout selection if needed */
154         if (sb->s_export_op->map_blocks &&
155             sb->s_export_op->commit_blocks &&
156             sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops)
157                 exp->ex_layout_types |= 1 << LAYOUT_SCSI;
158 #endif
159 }
160
161 static void
162 nfsd4_free_layout_stateid(struct nfs4_stid *stid)
163 {
164         struct nfs4_layout_stateid *ls = layoutstateid(stid);
165         struct nfs4_client *clp = ls->ls_stid.sc_client;
166         struct nfs4_file *fp = ls->ls_stid.sc_file;
167
168         trace_layoutstate_free(&ls->ls_stid.sc_stateid);
169
170         spin_lock(&clp->cl_lock);
171         list_del_init(&ls->ls_perclnt);
172         spin_unlock(&clp->cl_lock);
173
174         spin_lock(&fp->fi_lock);
175         list_del_init(&ls->ls_perfile);
176         spin_unlock(&fp->fi_lock);
177
178         if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
179                 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
180         fput(ls->ls_file);
181
182         if (ls->ls_recalled)
183                 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
184
185         kmem_cache_free(nfs4_layout_stateid_cache, ls);
186 }
187
188 static int
189 nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
190 {
191         struct file_lock *fl;
192         int status;
193
194         if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls)
195                 return 0;
196
197         fl = locks_alloc_lock();
198         if (!fl)
199                 return -ENOMEM;
200         locks_init_lock(fl);
201         fl->fl_lmops = &nfsd4_layouts_lm_ops;
202         fl->fl_flags = FL_LAYOUT;
203         fl->fl_type = F_RDLCK;
204         fl->fl_end = OFFSET_MAX;
205         fl->fl_owner = ls;
206         fl->fl_pid = current->tgid;
207         fl->fl_file = ls->ls_file;
208
209         status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
210         if (status) {
211                 locks_free_lock(fl);
212                 return status;
213         }
214         BUG_ON(fl != NULL);
215         return 0;
216 }
217
218 static struct nfs4_layout_stateid *
219 nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
220                 struct nfs4_stid *parent, u32 layout_type)
221 {
222         struct nfs4_client *clp = cstate->clp;
223         struct nfs4_file *fp = parent->sc_file;
224         struct nfs4_layout_stateid *ls;
225         struct nfs4_stid *stp;
226
227         stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache,
228                                         nfsd4_free_layout_stateid);
229         if (!stp)
230                 return NULL;
231
232         get_nfs4_file(fp);
233         stp->sc_file = fp;
234
235         ls = layoutstateid(stp);
236         INIT_LIST_HEAD(&ls->ls_perclnt);
237         INIT_LIST_HEAD(&ls->ls_perfile);
238         spin_lock_init(&ls->ls_lock);
239         INIT_LIST_HEAD(&ls->ls_layouts);
240         mutex_init(&ls->ls_mutex);
241         ls->ls_layout_type = layout_type;
242         nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
243                         NFSPROC4_CLNT_CB_LAYOUT);
244
245         if (parent->sc_type == NFS4_DELEG_STID)
246                 ls->ls_file = get_file(fp->fi_deleg_file);
247         else
248                 ls->ls_file = find_any_file(fp);
249         BUG_ON(!ls->ls_file);
250
251         if (nfsd4_layout_setlease(ls)) {
252                 fput(ls->ls_file);
253                 put_nfs4_file(fp);
254                 kmem_cache_free(nfs4_layout_stateid_cache, ls);
255                 return NULL;
256         }
257
258         spin_lock(&clp->cl_lock);
259         stp->sc_type = NFS4_LAYOUT_STID;
260         list_add(&ls->ls_perclnt, &clp->cl_lo_states);
261         spin_unlock(&clp->cl_lock);
262
263         spin_lock(&fp->fi_lock);
264         list_add(&ls->ls_perfile, &fp->fi_lo_states);
265         spin_unlock(&fp->fi_lock);
266
267         trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
268         return ls;
269 }
270
271 __be32
272 nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
273                 struct nfsd4_compound_state *cstate, stateid_t *stateid,
274                 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
275 {
276         struct nfs4_layout_stateid *ls;
277         struct nfs4_stid *stid;
278         unsigned char typemask = NFS4_LAYOUT_STID;
279         __be32 status;
280
281         if (create)
282                 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
283
284         status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
285                         net_generic(SVC_NET(rqstp), nfsd_net_id));
286         if (status)
287                 goto out;
288
289         if (!fh_match(&cstate->current_fh.fh_handle,
290                       &stid->sc_file->fi_fhandle)) {
291                 status = nfserr_bad_stateid;
292                 goto out_put_stid;
293         }
294
295         if (stid->sc_type != NFS4_LAYOUT_STID) {
296                 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
297                 nfs4_put_stid(stid);
298
299                 status = nfserr_jukebox;
300                 if (!ls)
301                         goto out;
302                 mutex_lock(&ls->ls_mutex);
303         } else {
304                 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
305
306                 status = nfserr_bad_stateid;
307                 mutex_lock(&ls->ls_mutex);
308                 if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid))
309                         goto out_unlock_stid;
310                 if (layout_type != ls->ls_layout_type)
311                         goto out_unlock_stid;
312         }
313
314         *lsp = ls;
315         return 0;
316
317 out_unlock_stid:
318         mutex_unlock(&ls->ls_mutex);
319 out_put_stid:
320         nfs4_put_stid(stid);
321 out:
322         return status;
323 }
324
325 static void
326 nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
327 {
328         spin_lock(&ls->ls_lock);
329         if (ls->ls_recalled)
330                 goto out_unlock;
331
332         ls->ls_recalled = true;
333         atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
334         if (list_empty(&ls->ls_layouts))
335                 goto out_unlock;
336
337         trace_layout_recall(&ls->ls_stid.sc_stateid);
338
339         refcount_inc(&ls->ls_stid.sc_count);
340         nfsd4_run_cb(&ls->ls_recall);
341
342 out_unlock:
343         spin_unlock(&ls->ls_lock);
344 }
345
346 static inline u64
347 layout_end(struct nfsd4_layout_seg *seg)
348 {
349         u64 end = seg->offset + seg->length;
350         return end >= seg->offset ? end : NFS4_MAX_UINT64;
351 }
352
353 static void
354 layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
355 {
356         if (end == NFS4_MAX_UINT64)
357                 lo->length = NFS4_MAX_UINT64;
358         else
359                 lo->length = end - lo->offset;
360 }
361
362 static bool
363 layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
364 {
365         if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
366                 return false;
367         if (layout_end(&lo->lo_seg) <= s->offset)
368                 return false;
369         if (layout_end(s) <= lo->lo_seg.offset)
370                 return false;
371         return true;
372 }
373
374 static bool
375 layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
376 {
377         if (lo->iomode != new->iomode)
378                 return false;
379         if (layout_end(new) < lo->offset)
380                 return false;
381         if (layout_end(lo) < new->offset)
382                 return false;
383
384         lo->offset = min(lo->offset, new->offset);
385         layout_update_len(lo, max(layout_end(lo), layout_end(new)));
386         return true;
387 }
388
389 static __be32
390 nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
391 {
392         struct nfs4_file *fp = ls->ls_stid.sc_file;
393         struct nfs4_layout_stateid *l, *n;
394         __be32 nfserr = nfs_ok;
395
396         assert_spin_locked(&fp->fi_lock);
397
398         list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
399                 if (l != ls) {
400                         nfsd4_recall_file_layout(l);
401                         nfserr = nfserr_recallconflict;
402                 }
403         }
404
405         return nfserr;
406 }
407
408 __be32
409 nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
410 {
411         struct nfsd4_layout_seg *seg = &lgp->lg_seg;
412         struct nfs4_file *fp = ls->ls_stid.sc_file;
413         struct nfs4_layout *lp, *new = NULL;
414         __be32 nfserr;
415
416         spin_lock(&fp->fi_lock);
417         nfserr = nfsd4_recall_conflict(ls);
418         if (nfserr)
419                 goto out;
420         spin_lock(&ls->ls_lock);
421         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
422                 if (layouts_try_merge(&lp->lo_seg, seg))
423                         goto done;
424         }
425         spin_unlock(&ls->ls_lock);
426         spin_unlock(&fp->fi_lock);
427
428         new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
429         if (!new)
430                 return nfserr_jukebox;
431         memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
432         new->lo_state = ls;
433
434         spin_lock(&fp->fi_lock);
435         nfserr = nfsd4_recall_conflict(ls);
436         if (nfserr)
437                 goto out;
438         spin_lock(&ls->ls_lock);
439         list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
440                 if (layouts_try_merge(&lp->lo_seg, seg))
441                         goto done;
442         }
443
444         refcount_inc(&ls->ls_stid.sc_count);
445         list_add_tail(&new->lo_perstate, &ls->ls_layouts);
446         new = NULL;
447 done:
448         nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid);
449         spin_unlock(&ls->ls_lock);
450 out:
451         spin_unlock(&fp->fi_lock);
452         if (new)
453                 kmem_cache_free(nfs4_layout_cache, new);
454         return nfserr;
455 }
456
457 static void
458 nfsd4_free_layouts(struct list_head *reaplist)
459 {
460         while (!list_empty(reaplist)) {
461                 struct nfs4_layout *lp = list_first_entry(reaplist,
462                                 struct nfs4_layout, lo_perstate);
463
464                 list_del(&lp->lo_perstate);
465                 nfs4_put_stid(&lp->lo_state->ls_stid);
466                 kmem_cache_free(nfs4_layout_cache, lp);
467         }
468 }
469
470 static void
471 nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
472                 struct list_head *reaplist)
473 {
474         struct nfsd4_layout_seg *lo = &lp->lo_seg;
475         u64 end = layout_end(lo);
476
477         if (seg->offset <= lo->offset) {
478                 if (layout_end(seg) >= end) {
479                         list_move_tail(&lp->lo_perstate, reaplist);
480                         return;
481                 }
482                 lo->offset = layout_end(seg);
483         } else {
484                 /* retain the whole layout segment on a split. */
485                 if (layout_end(seg) < end) {
486                         dprintk("%s: split not supported\n", __func__);
487                         return;
488                 }
489                 end = seg->offset;
490         }
491
492         layout_update_len(lo, end);
493 }
494
495 __be32
496 nfsd4_return_file_layouts(struct svc_rqst *rqstp,
497                 struct nfsd4_compound_state *cstate,
498                 struct nfsd4_layoutreturn *lrp)
499 {
500         struct nfs4_layout_stateid *ls;
501         struct nfs4_layout *lp, *n;
502         LIST_HEAD(reaplist);
503         __be32 nfserr;
504         int found = 0;
505
506         nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
507                                                 false, lrp->lr_layout_type,
508                                                 &ls);
509         if (nfserr) {
510                 trace_layout_return_lookup_fail(&lrp->lr_sid);
511                 return nfserr;
512         }
513
514         spin_lock(&ls->ls_lock);
515         list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
516                 if (layouts_overlapping(lp, &lrp->lr_seg)) {
517                         nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
518                         found++;
519                 }
520         }
521         if (!list_empty(&ls->ls_layouts)) {
522                 if (found)
523                         nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid);
524                 lrp->lrs_present = 1;
525         } else {
526                 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
527                 nfs4_unhash_stid(&ls->ls_stid);
528                 lrp->lrs_present = 0;
529         }
530         spin_unlock(&ls->ls_lock);
531
532         mutex_unlock(&ls->ls_mutex);
533         nfs4_put_stid(&ls->ls_stid);
534         nfsd4_free_layouts(&reaplist);
535         return nfs_ok;
536 }
537
538 __be32
539 nfsd4_return_client_layouts(struct svc_rqst *rqstp,
540                 struct nfsd4_compound_state *cstate,
541                 struct nfsd4_layoutreturn *lrp)
542 {
543         struct nfs4_layout_stateid *ls, *n;
544         struct nfs4_client *clp = cstate->clp;
545         struct nfs4_layout *lp, *t;
546         LIST_HEAD(reaplist);
547
548         lrp->lrs_present = 0;
549
550         spin_lock(&clp->cl_lock);
551         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
552                 if (ls->ls_layout_type != lrp->lr_layout_type)
553                         continue;
554
555                 if (lrp->lr_return_type == RETURN_FSID &&
556                     !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
557                                    &cstate->current_fh.fh_handle))
558                         continue;
559
560                 spin_lock(&ls->ls_lock);
561                 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
562                         if (lrp->lr_seg.iomode == IOMODE_ANY ||
563                             lrp->lr_seg.iomode == lp->lo_seg.iomode)
564                                 list_move_tail(&lp->lo_perstate, &reaplist);
565                 }
566                 spin_unlock(&ls->ls_lock);
567         }
568         spin_unlock(&clp->cl_lock);
569
570         nfsd4_free_layouts(&reaplist);
571         return 0;
572 }
573
574 static void
575 nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
576                 struct list_head *reaplist)
577 {
578         spin_lock(&ls->ls_lock);
579         list_splice_init(&ls->ls_layouts, reaplist);
580         spin_unlock(&ls->ls_lock);
581 }
582
583 void
584 nfsd4_return_all_client_layouts(struct nfs4_client *clp)
585 {
586         struct nfs4_layout_stateid *ls, *n;
587         LIST_HEAD(reaplist);
588
589         spin_lock(&clp->cl_lock);
590         list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
591                 nfsd4_return_all_layouts(ls, &reaplist);
592         spin_unlock(&clp->cl_lock);
593
594         nfsd4_free_layouts(&reaplist);
595 }
596
597 void
598 nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
599 {
600         struct nfs4_layout_stateid *ls, *n;
601         LIST_HEAD(reaplist);
602
603         spin_lock(&fp->fi_lock);
604         list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
605                 if (ls->ls_stid.sc_client == clp)
606                         nfsd4_return_all_layouts(ls, &reaplist);
607         }
608         spin_unlock(&fp->fi_lock);
609
610         nfsd4_free_layouts(&reaplist);
611 }
612
613 static void
614 nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
615 {
616         struct nfs4_client *clp = ls->ls_stid.sc_client;
617         char addr_str[INET6_ADDRSTRLEN];
618         static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
619         static char *envp[] = {
620                 "HOME=/",
621                 "TERM=linux",
622                 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
623                 NULL
624         };
625         char *argv[8];
626         int error;
627
628         rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
629
630         printk(KERN_WARNING
631                 "nfsd: client %s failed to respond to layout recall. "
632                 "  Fencing..\n", addr_str);
633
634         argv[0] = (char *)nfsd_recall_failed;
635         argv[1] = addr_str;
636         argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
637         argv[3] = NULL;
638
639         error = call_usermodehelper(nfsd_recall_failed, argv, envp,
640                                     UMH_WAIT_PROC);
641         if (error) {
642                 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
643                         addr_str, error);
644         }
645 }
646
647 static void
648 nfsd4_cb_layout_prepare(struct nfsd4_callback *cb)
649 {
650         struct nfs4_layout_stateid *ls =
651                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
652
653         mutex_lock(&ls->ls_mutex);
654         nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid);
655         mutex_unlock(&ls->ls_mutex);
656 }
657
658 static int
659 nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
660 {
661         struct nfs4_layout_stateid *ls =
662                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
663         struct nfsd_net *nn;
664         ktime_t now, cutoff;
665         const struct nfsd4_layout_ops *ops;
666         LIST_HEAD(reaplist);
667
668
669         switch (task->tk_status) {
670         case 0:
671         case -NFS4ERR_DELAY:
672                 /*
673                  * Anything left? If not, then call it done. Note that we don't
674                  * take the spinlock since this is an optimization and nothing
675                  * should get added until the cb counter goes to zero.
676                  */
677                 if (list_empty(&ls->ls_layouts))
678                         return 1;
679
680                 /* Poll the client until it's done with the layout */
681                 now = ktime_get();
682                 nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id);
683
684                 /* Client gets 2 lease periods to return it */
685                 cutoff = ktime_add_ns(task->tk_start,
686                                          nn->nfsd4_lease * NSEC_PER_SEC * 2);
687
688                 if (ktime_before(now, cutoff)) {
689                         rpc_delay(task, HZ/100); /* 10 mili-seconds */
690                         return 0;
691                 }
692                 /* Fallthrough */
693         default:
694                 /*
695                  * Unknown error or non-responding client, we'll need to fence.
696                  */
697                 trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
698
699                 ops = nfsd4_layout_ops[ls->ls_layout_type];
700                 if (ops->fence_client)
701                         ops->fence_client(ls);
702                 else
703                         nfsd4_cb_layout_fail(ls);
704                 return -1;
705         case -NFS4ERR_NOMATCHING_LAYOUT:
706                 trace_layout_recall_done(&ls->ls_stid.sc_stateid);
707                 task->tk_status = 0;
708                 return 1;
709         }
710 }
711
712 static void
713 nfsd4_cb_layout_release(struct nfsd4_callback *cb)
714 {
715         struct nfs4_layout_stateid *ls =
716                 container_of(cb, struct nfs4_layout_stateid, ls_recall);
717         LIST_HEAD(reaplist);
718
719         trace_layout_recall_release(&ls->ls_stid.sc_stateid);
720
721         nfsd4_return_all_layouts(ls, &reaplist);
722         nfsd4_free_layouts(&reaplist);
723         nfs4_put_stid(&ls->ls_stid);
724 }
725
726 static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
727         .prepare        = nfsd4_cb_layout_prepare,
728         .done           = nfsd4_cb_layout_done,
729         .release        = nfsd4_cb_layout_release,
730 };
731
732 static bool
733 nfsd4_layout_lm_break(struct file_lock *fl)
734 {
735         /*
736          * We don't want the locks code to timeout the lease for us;
737          * we'll remove it ourself if a layout isn't returned
738          * in time:
739          */
740         fl->fl_break_time = 0;
741         nfsd4_recall_file_layout(fl->fl_owner);
742         return false;
743 }
744
745 static int
746 nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
747                 struct list_head *dispose)
748 {
749         BUG_ON(!(arg & F_UNLCK));
750         return lease_modify(onlist, arg, dispose);
751 }
752
753 static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
754         .lm_break       = nfsd4_layout_lm_break,
755         .lm_change      = nfsd4_layout_lm_change,
756 };
757
758 int
759 nfsd4_init_pnfs(void)
760 {
761         int i;
762
763         for (i = 0; i < DEVID_HASH_SIZE; i++)
764                 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
765
766         nfs4_layout_cache = kmem_cache_create("nfs4_layout",
767                         sizeof(struct nfs4_layout), 0, 0, NULL);
768         if (!nfs4_layout_cache)
769                 return -ENOMEM;
770
771         nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
772                         sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
773         if (!nfs4_layout_stateid_cache) {
774                 kmem_cache_destroy(nfs4_layout_cache);
775                 return -ENOMEM;
776         }
777         return 0;
778 }
779
780 void
781 nfsd4_exit_pnfs(void)
782 {
783         int i;
784
785         kmem_cache_destroy(nfs4_layout_cache);
786         kmem_cache_destroy(nfs4_layout_stateid_cache);
787
788         for (i = 0; i < DEVID_HASH_SIZE; i++) {
789                 struct nfsd4_deviceid_map *map, *n;
790
791                 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
792                         kfree(map);
793         }
794 }