blob: 6904213a436368e47628af85701a3beb68e0550b [file] [log] [blame]
Christoph Hellwig9cf514c2014-05-05 13:11:59 +02001/*
2 * Copyright (c) 2014 Christoph Hellwig.
3 */
Christoph Hellwigc5c707f2014-09-23 12:38:48 +02004#include <linux/kmod.h>
5#include <linux/file.h>
Christoph Hellwig9cf514c2014-05-05 13:11:59 +02006#include <linux/jhash.h>
7#include <linux/sched.h>
Christoph Hellwigc5c707f2014-09-23 12:38:48 +02008#include <linux/sunrpc/addr.h>
Christoph Hellwig9cf514c2014-05-05 13:11:59 +02009
10#include "pnfs.h"
11#include "netns.h"
Christoph Hellwig31ef83d2014-08-16 19:02:22 -050012#include "trace.h"
Christoph Hellwig9cf514c2014-05-05 13:11:59 +020013
14#define NFSDDBG_FACILITY NFSDDBG_PNFS
15
16struct nfs4_layout {
17 struct list_head lo_perstate;
18 struct nfs4_layout_stateid *lo_state;
19 struct nfsd4_layout_seg lo_seg;
20};
21
22static struct kmem_cache *nfs4_layout_cache;
23static struct kmem_cache *nfs4_layout_stateid_cache;
24
Christoph Hellwigc5c707f2014-09-23 12:38:48 +020025static struct nfsd4_callback_ops nfsd4_cb_layout_ops;
26static const struct lock_manager_operations nfsd4_layouts_lm_ops;
27
Christoph Hellwig9cf514c2014-05-05 13:11:59 +020028const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = {
Christoph Hellwig8650b8a2015-01-21 11:40:00 +010029 [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops,
Christoph Hellwig9cf514c2014-05-05 13:11:59 +020030};
31
32/* pNFS device ID to export fsid mapping */
33#define DEVID_HASH_BITS 8
34#define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS)
35#define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1)
36static u64 nfsd_devid_seq = 1;
37static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE];
38static DEFINE_SPINLOCK(nfsd_devid_lock);
39
40static inline u32 devid_hashfn(u64 idx)
41{
42 return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK;
43}
44
45static void
46nfsd4_alloc_devid_map(const struct svc_fh *fhp)
47{
48 const struct knfsd_fh *fh = &fhp->fh_handle;
49 size_t fsid_len = key_len(fh->fh_fsid_type);
50 struct nfsd4_deviceid_map *map, *old;
51 int i;
52
53 map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL);
54 if (!map)
55 return;
56
57 map->fsid_type = fh->fh_fsid_type;
58 memcpy(&map->fsid, fh->fh_fsid, fsid_len);
59
60 spin_lock(&nfsd_devid_lock);
61 if (fhp->fh_export->ex_devid_map)
62 goto out_unlock;
63
64 for (i = 0; i < DEVID_HASH_SIZE; i++) {
65 list_for_each_entry(old, &nfsd_devid_hash[i], hash) {
66 if (old->fsid_type != fh->fh_fsid_type)
67 continue;
68 if (memcmp(old->fsid, fh->fh_fsid,
69 key_len(old->fsid_type)))
70 continue;
71
72 fhp->fh_export->ex_devid_map = old;
73 goto out_unlock;
74 }
75 }
76
77 map->idx = nfsd_devid_seq++;
78 list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]);
79 fhp->fh_export->ex_devid_map = map;
80 map = NULL;
81
82out_unlock:
83 spin_unlock(&nfsd_devid_lock);
84 kfree(map);
85}
86
87struct nfsd4_deviceid_map *
88nfsd4_find_devid_map(int idx)
89{
90 struct nfsd4_deviceid_map *map, *ret = NULL;
91
92 rcu_read_lock();
93 list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash)
94 if (map->idx == idx)
95 ret = map;
96 rcu_read_unlock();
97
98 return ret;
99}
100
101int
102nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp,
103 u32 device_generation)
104{
105 if (!fhp->fh_export->ex_devid_map) {
106 nfsd4_alloc_devid_map(fhp);
107 if (!fhp->fh_export->ex_devid_map)
108 return -ENOMEM;
109 }
110
111 id->fsid_idx = fhp->fh_export->ex_devid_map->idx;
112 id->generation = device_generation;
113 id->pad = 0;
114 return 0;
115}
116
117void nfsd4_setup_layout_type(struct svc_export *exp)
118{
Christoph Hellwig8650b8a2015-01-21 11:40:00 +0100119 struct super_block *sb = exp->ex_path.mnt->mnt_sb;
120
Christoph Hellwigf3f03332015-03-30 18:46:29 +0200121 if (!(exp->ex_flags & NFSEXP_PNFS))
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200122 return;
Christoph Hellwig8650b8a2015-01-21 11:40:00 +0100123
124 if (sb->s_export_op->get_uuid &&
125 sb->s_export_op->map_blocks &&
126 sb->s_export_op->commit_blocks)
127 exp->ex_layout_type = LAYOUT_BLOCK_VOLUME;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200128}
129
130static void
131nfsd4_free_layout_stateid(struct nfs4_stid *stid)
132{
133 struct nfs4_layout_stateid *ls = layoutstateid(stid);
134 struct nfs4_client *clp = ls->ls_stid.sc_client;
135 struct nfs4_file *fp = ls->ls_stid.sc_file;
136
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500137 trace_layoutstate_free(&ls->ls_stid.sc_stateid);
138
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200139 spin_lock(&clp->cl_lock);
140 list_del_init(&ls->ls_perclnt);
141 spin_unlock(&clp->cl_lock);
142
143 spin_lock(&fp->fi_lock);
144 list_del_init(&ls->ls_perfile);
145 spin_unlock(&fp->fi_lock);
146
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200147 vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls);
148 fput(ls->ls_file);
149
150 if (ls->ls_recalled)
151 atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls);
152
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200153 kmem_cache_free(nfs4_layout_stateid_cache, ls);
154}
155
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200156static int
157nfsd4_layout_setlease(struct nfs4_layout_stateid *ls)
158{
159 struct file_lock *fl;
160 int status;
161
162 fl = locks_alloc_lock();
163 if (!fl)
164 return -ENOMEM;
165 locks_init_lock(fl);
166 fl->fl_lmops = &nfsd4_layouts_lm_ops;
167 fl->fl_flags = FL_LAYOUT;
168 fl->fl_type = F_RDLCK;
169 fl->fl_end = OFFSET_MAX;
170 fl->fl_owner = ls;
171 fl->fl_pid = current->tgid;
172 fl->fl_file = ls->ls_file;
173
174 status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL);
175 if (status) {
176 locks_free_lock(fl);
177 return status;
178 }
179 BUG_ON(fl != NULL);
180 return 0;
181}
182
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200183static struct nfs4_layout_stateid *
184nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate,
185 struct nfs4_stid *parent, u32 layout_type)
186{
187 struct nfs4_client *clp = cstate->clp;
188 struct nfs4_file *fp = parent->sc_file;
189 struct nfs4_layout_stateid *ls;
190 struct nfs4_stid *stp;
191
192 stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache);
193 if (!stp)
194 return NULL;
195 stp->sc_free = nfsd4_free_layout_stateid;
196 get_nfs4_file(fp);
197 stp->sc_file = fp;
198
199 ls = layoutstateid(stp);
200 INIT_LIST_HEAD(&ls->ls_perclnt);
201 INIT_LIST_HEAD(&ls->ls_perfile);
202 spin_lock_init(&ls->ls_lock);
203 INIT_LIST_HEAD(&ls->ls_layouts);
204 ls->ls_layout_type = layout_type;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200205 nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops,
206 NFSPROC4_CLNT_CB_LAYOUT);
207
208 if (parent->sc_type == NFS4_DELEG_STID)
209 ls->ls_file = get_file(fp->fi_deleg_file);
210 else
211 ls->ls_file = find_any_file(fp);
212 BUG_ON(!ls->ls_file);
213
214 if (nfsd4_layout_setlease(ls)) {
215 put_nfs4_file(fp);
216 kmem_cache_free(nfs4_layout_stateid_cache, ls);
217 return NULL;
218 }
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200219
220 spin_lock(&clp->cl_lock);
221 stp->sc_type = NFS4_LAYOUT_STID;
222 list_add(&ls->ls_perclnt, &clp->cl_lo_states);
223 spin_unlock(&clp->cl_lock);
224
225 spin_lock(&fp->fi_lock);
226 list_add(&ls->ls_perfile, &fp->fi_lo_states);
227 spin_unlock(&fp->fi_lock);
228
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500229 trace_layoutstate_alloc(&ls->ls_stid.sc_stateid);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200230 return ls;
231}
232
233__be32
234nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp,
235 struct nfsd4_compound_state *cstate, stateid_t *stateid,
236 bool create, u32 layout_type, struct nfs4_layout_stateid **lsp)
237{
238 struct nfs4_layout_stateid *ls;
239 struct nfs4_stid *stid;
240 unsigned char typemask = NFS4_LAYOUT_STID;
241 __be32 status;
242
243 if (create)
244 typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID);
245
246 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid,
247 net_generic(SVC_NET(rqstp), nfsd_net_id));
248 if (status)
249 goto out;
250
251 if (!fh_match(&cstate->current_fh.fh_handle,
252 &stid->sc_file->fi_fhandle)) {
253 status = nfserr_bad_stateid;
254 goto out_put_stid;
255 }
256
257 if (stid->sc_type != NFS4_LAYOUT_STID) {
258 ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type);
259 nfs4_put_stid(stid);
260
261 status = nfserr_jukebox;
262 if (!ls)
263 goto out;
264 } else {
265 ls = container_of(stid, struct nfs4_layout_stateid, ls_stid);
266
267 status = nfserr_bad_stateid;
268 if (stateid->si_generation > stid->sc_stateid.si_generation)
269 goto out_put_stid;
270 if (layout_type != ls->ls_layout_type)
271 goto out_put_stid;
272 }
273
274 *lsp = ls;
275 return 0;
276
277out_put_stid:
278 nfs4_put_stid(stid);
279out:
280 return status;
281}
282
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200283static void
284nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
285{
286 spin_lock(&ls->ls_lock);
287 if (ls->ls_recalled)
288 goto out_unlock;
289
290 ls->ls_recalled = true;
291 atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
292 if (list_empty(&ls->ls_layouts))
293 goto out_unlock;
294
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500295 trace_layout_recall(&ls->ls_stid.sc_stateid);
296
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200297 atomic_inc(&ls->ls_stid.sc_count);
298 update_stateid(&ls->ls_stid.sc_stateid);
299 memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
300 nfsd4_run_cb(&ls->ls_recall);
301
302out_unlock:
303 spin_unlock(&ls->ls_lock);
304}
305
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200306static inline u64
307layout_end(struct nfsd4_layout_seg *seg)
308{
309 u64 end = seg->offset + seg->length;
310 return end >= seg->offset ? end : NFS4_MAX_UINT64;
311}
312
313static void
314layout_update_len(struct nfsd4_layout_seg *lo, u64 end)
315{
316 if (end == NFS4_MAX_UINT64)
317 lo->length = NFS4_MAX_UINT64;
318 else
319 lo->length = end - lo->offset;
320}
321
322static bool
323layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s)
324{
325 if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode)
326 return false;
327 if (layout_end(&lo->lo_seg) <= s->offset)
328 return false;
329 if (layout_end(s) <= lo->lo_seg.offset)
330 return false;
331 return true;
332}
333
334static bool
335layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new)
336{
337 if (lo->iomode != new->iomode)
338 return false;
339 if (layout_end(new) < lo->offset)
340 return false;
341 if (layout_end(lo) < new->offset)
342 return false;
343
344 lo->offset = min(lo->offset, new->offset);
345 layout_update_len(lo, max(layout_end(lo), layout_end(new)));
346 return true;
347}
348
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200349static __be32
350nfsd4_recall_conflict(struct nfs4_layout_stateid *ls)
351{
352 struct nfs4_file *fp = ls->ls_stid.sc_file;
353 struct nfs4_layout_stateid *l, *n;
354 __be32 nfserr = nfs_ok;
355
356 assert_spin_locked(&fp->fi_lock);
357
358 list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) {
359 if (l != ls) {
360 nfsd4_recall_file_layout(l);
361 nfserr = nfserr_recallconflict;
362 }
363 }
364
365 return nfserr;
366}
367
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200368__be32
369nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls)
370{
371 struct nfsd4_layout_seg *seg = &lgp->lg_seg;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200372 struct nfs4_file *fp = ls->ls_stid.sc_file;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200373 struct nfs4_layout *lp, *new = NULL;
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200374 __be32 nfserr;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200375
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200376 spin_lock(&fp->fi_lock);
377 nfserr = nfsd4_recall_conflict(ls);
378 if (nfserr)
379 goto out;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200380 spin_lock(&ls->ls_lock);
381 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
382 if (layouts_try_merge(&lp->lo_seg, seg))
383 goto done;
384 }
385 spin_unlock(&ls->ls_lock);
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200386 spin_unlock(&fp->fi_lock);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200387
388 new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL);
389 if (!new)
390 return nfserr_jukebox;
391 memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg));
392 new->lo_state = ls;
393
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200394 spin_lock(&fp->fi_lock);
395 nfserr = nfsd4_recall_conflict(ls);
396 if (nfserr)
397 goto out;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200398 spin_lock(&ls->ls_lock);
399 list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) {
400 if (layouts_try_merge(&lp->lo_seg, seg))
401 goto done;
402 }
403
404 atomic_inc(&ls->ls_stid.sc_count);
405 list_add_tail(&new->lo_perstate, &ls->ls_layouts);
406 new = NULL;
407done:
408 update_stateid(&ls->ls_stid.sc_stateid);
409 memcpy(&lgp->lg_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t));
410 spin_unlock(&ls->ls_lock);
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200411out:
412 spin_unlock(&fp->fi_lock);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200413 if (new)
414 kmem_cache_free(nfs4_layout_cache, new);
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200415 return nfserr;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200416}
417
418static void
419nfsd4_free_layouts(struct list_head *reaplist)
420{
421 while (!list_empty(reaplist)) {
422 struct nfs4_layout *lp = list_first_entry(reaplist,
423 struct nfs4_layout, lo_perstate);
424
425 list_del(&lp->lo_perstate);
426 nfs4_put_stid(&lp->lo_state->ls_stid);
427 kmem_cache_free(nfs4_layout_cache, lp);
428 }
429}
430
431static void
432nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg,
433 struct list_head *reaplist)
434{
435 struct nfsd4_layout_seg *lo = &lp->lo_seg;
436 u64 end = layout_end(lo);
437
438 if (seg->offset <= lo->offset) {
439 if (layout_end(seg) >= end) {
440 list_move_tail(&lp->lo_perstate, reaplist);
441 return;
442 }
Kinglong Mee78902032015-03-22 22:17:20 +0800443 lo->offset = layout_end(seg);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200444 } else {
445 /* retain the whole layout segment on a split. */
446 if (layout_end(seg) < end) {
447 dprintk("%s: split not supported\n", __func__);
448 return;
449 }
Kinglong Mee78902032015-03-22 22:17:20 +0800450 end = seg->offset;
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200451 }
452
453 layout_update_len(lo, end);
454}
455
456__be32
457nfsd4_return_file_layouts(struct svc_rqst *rqstp,
458 struct nfsd4_compound_state *cstate,
459 struct nfsd4_layoutreturn *lrp)
460{
461 struct nfs4_layout_stateid *ls;
462 struct nfs4_layout *lp, *n;
463 LIST_HEAD(reaplist);
464 __be32 nfserr;
465 int found = 0;
466
467 nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid,
468 false, lrp->lr_layout_type,
469 &ls);
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500470 if (nfserr) {
471 trace_layout_return_lookup_fail(&lrp->lr_sid);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200472 return nfserr;
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500473 }
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200474
475 spin_lock(&ls->ls_lock);
476 list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) {
477 if (layouts_overlapping(lp, &lrp->lr_seg)) {
478 nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist);
479 found++;
480 }
481 }
482 if (!list_empty(&ls->ls_layouts)) {
483 if (found) {
484 update_stateid(&ls->ls_stid.sc_stateid);
485 memcpy(&lrp->lr_sid, &ls->ls_stid.sc_stateid,
486 sizeof(stateid_t));
487 }
488 lrp->lrs_present = 1;
489 } else {
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500490 trace_layoutstate_unhash(&ls->ls_stid.sc_stateid);
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200491 nfs4_unhash_stid(&ls->ls_stid);
492 lrp->lrs_present = 0;
493 }
494 spin_unlock(&ls->ls_lock);
495
496 nfs4_put_stid(&ls->ls_stid);
497 nfsd4_free_layouts(&reaplist);
498 return nfs_ok;
499}
500
501__be32
502nfsd4_return_client_layouts(struct svc_rqst *rqstp,
503 struct nfsd4_compound_state *cstate,
504 struct nfsd4_layoutreturn *lrp)
505{
506 struct nfs4_layout_stateid *ls, *n;
507 struct nfs4_client *clp = cstate->clp;
508 struct nfs4_layout *lp, *t;
509 LIST_HEAD(reaplist);
510
511 lrp->lrs_present = 0;
512
513 spin_lock(&clp->cl_lock);
514 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) {
Kinglong Mee6f8f28e2015-03-19 19:04:14 +0800515 if (ls->ls_layout_type != lrp->lr_layout_type)
516 continue;
517
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200518 if (lrp->lr_return_type == RETURN_FSID &&
519 !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle,
520 &cstate->current_fh.fh_handle))
521 continue;
522
523 spin_lock(&ls->ls_lock);
524 list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) {
525 if (lrp->lr_seg.iomode == IOMODE_ANY ||
526 lrp->lr_seg.iomode == lp->lo_seg.iomode)
527 list_move_tail(&lp->lo_perstate, &reaplist);
528 }
529 spin_unlock(&ls->ls_lock);
530 }
531 spin_unlock(&clp->cl_lock);
532
533 nfsd4_free_layouts(&reaplist);
534 return 0;
535}
536
537static void
538nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls,
539 struct list_head *reaplist)
540{
541 spin_lock(&ls->ls_lock);
542 list_splice_init(&ls->ls_layouts, reaplist);
543 spin_unlock(&ls->ls_lock);
544}
545
546void
547nfsd4_return_all_client_layouts(struct nfs4_client *clp)
548{
549 struct nfs4_layout_stateid *ls, *n;
550 LIST_HEAD(reaplist);
551
552 spin_lock(&clp->cl_lock);
553 list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt)
554 nfsd4_return_all_layouts(ls, &reaplist);
555 spin_unlock(&clp->cl_lock);
556
557 nfsd4_free_layouts(&reaplist);
558}
559
560void
561nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp)
562{
563 struct nfs4_layout_stateid *ls, *n;
564 LIST_HEAD(reaplist);
565
566 spin_lock(&fp->fi_lock);
567 list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) {
568 if (ls->ls_stid.sc_client == clp)
569 nfsd4_return_all_layouts(ls, &reaplist);
570 }
571 spin_unlock(&fp->fi_lock);
572
573 nfsd4_free_layouts(&reaplist);
574}
575
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200576static void
577nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
578{
579 struct nfs4_client *clp = ls->ls_stid.sc_client;
580 char addr_str[INET6_ADDRSTRLEN];
581 static char *envp[] = {
582 "HOME=/",
583 "TERM=linux",
584 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
585 NULL
586 };
587 char *argv[8];
588 int error;
589
590 rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str));
591
Kinglong Mee715a03d2015-03-20 15:56:40 +0800592 trace_layout_recall_fail(&ls->ls_stid.sc_stateid);
593
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200594 printk(KERN_WARNING
595 "nfsd: client %s failed to respond to layout recall. "
596 " Fencing..\n", addr_str);
597
598 argv[0] = "/sbin/nfsd-recall-failed";
599 argv[1] = addr_str;
600 argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
601 argv[3] = NULL;
602
603 error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
604 if (error) {
605 printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
606 addr_str, error);
607 }
608}
609
610static int
611nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task)
612{
613 struct nfs4_layout_stateid *ls =
614 container_of(cb, struct nfs4_layout_stateid, ls_recall);
615 LIST_HEAD(reaplist);
616
617 switch (task->tk_status) {
618 case 0:
619 return 1;
620 case -NFS4ERR_NOMATCHING_LAYOUT:
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500621 trace_layout_recall_done(&ls->ls_stid.sc_stateid);
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200622 task->tk_status = 0;
623 return 1;
624 case -NFS4ERR_DELAY:
625 /* Poll the client until it's done with the layout */
626 /* FIXME: cap number of retries.
627 * The pnfs standard states that we need to only expire
628 * the client after at-least "lease time" .eg lease-time * 2
629 * when failing to communicate a recall
630 */
631 rpc_delay(task, HZ/100); /* 10 mili-seconds */
632 return 0;
633 default:
634 /*
635 * Unknown error or non-responding client, we'll need to fence.
636 */
637 nfsd4_cb_layout_fail(ls);
638 return -1;
639 }
640}
641
642static void
643nfsd4_cb_layout_release(struct nfsd4_callback *cb)
644{
645 struct nfs4_layout_stateid *ls =
646 container_of(cb, struct nfs4_layout_stateid, ls_recall);
647 LIST_HEAD(reaplist);
648
Christoph Hellwig31ef83d2014-08-16 19:02:22 -0500649 trace_layout_recall_release(&ls->ls_stid.sc_stateid);
650
Christoph Hellwigc5c707f2014-09-23 12:38:48 +0200651 nfsd4_return_all_layouts(ls, &reaplist);
652 nfsd4_free_layouts(&reaplist);
653 nfs4_put_stid(&ls->ls_stid);
654}
655
656static struct nfsd4_callback_ops nfsd4_cb_layout_ops = {
657 .done = nfsd4_cb_layout_done,
658 .release = nfsd4_cb_layout_release,
659};
660
661static bool
662nfsd4_layout_lm_break(struct file_lock *fl)
663{
664 /*
665 * We don't want the locks code to timeout the lease for us;
666 * we'll remove it ourself if a layout isn't returned
667 * in time:
668 */
669 fl->fl_break_time = 0;
670 nfsd4_recall_file_layout(fl->fl_owner);
671 return false;
672}
673
674static int
675nfsd4_layout_lm_change(struct file_lock *onlist, int arg,
676 struct list_head *dispose)
677{
678 BUG_ON(!(arg & F_UNLCK));
679 return lease_modify(onlist, arg, dispose);
680}
681
682static const struct lock_manager_operations nfsd4_layouts_lm_ops = {
683 .lm_break = nfsd4_layout_lm_break,
684 .lm_change = nfsd4_layout_lm_change,
685};
686
Christoph Hellwig9cf514c2014-05-05 13:11:59 +0200687int
688nfsd4_init_pnfs(void)
689{
690 int i;
691
692 for (i = 0; i < DEVID_HASH_SIZE; i++)
693 INIT_LIST_HEAD(&nfsd_devid_hash[i]);
694
695 nfs4_layout_cache = kmem_cache_create("nfs4_layout",
696 sizeof(struct nfs4_layout), 0, 0, NULL);
697 if (!nfs4_layout_cache)
698 return -ENOMEM;
699
700 nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid",
701 sizeof(struct nfs4_layout_stateid), 0, 0, NULL);
702 if (!nfs4_layout_stateid_cache) {
703 kmem_cache_destroy(nfs4_layout_cache);
704 return -ENOMEM;
705 }
706 return 0;
707}
708
709void
710nfsd4_exit_pnfs(void)
711{
712 int i;
713
714 kmem_cache_destroy(nfs4_layout_cache);
715 kmem_cache_destroy(nfs4_layout_stateid_cache);
716
717 for (i = 0; i < DEVID_HASH_SIZE; i++) {
718 struct nfsd4_deviceid_map *map, *n;
719
720 list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash)
721 kfree(map);
722 }
723}