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nfsd41: Add a create session replay cache
[net-next-2.6.git] / fs / nfsd / nfs4state.c
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1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
ec6b5d7b 71static u64 current_sessionid = 1;
fd39ca9a
N		 72
73#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
74#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 75
1da177e4 76/* forward declarations */
fd39ca9a 77static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 78static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 79static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
1da177e4 81
8b671b80
BF		 82/* Locking: */
83
84/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 85static DEFINE_MUTEX(client_mutex);
1da177e4 86
8b671b80
BF		 87/*
88 * Currently used for the del_recall_lru and file hash table. In an
89 * effort to decrease the scope of the client_mutex, this spinlock may
90 * eventually cover more:
91 */
92static DEFINE_SPINLOCK(recall_lock);
93
e18b890b
CL		 94static struct kmem_cache *stateowner_slab = NULL;
95static struct kmem_cache *file_slab = NULL;
96static struct kmem_cache *stateid_slab = NULL;
97static struct kmem_cache *deleg_slab = NULL;
e60d4398 98
1da177e4
LT		 99void
100nfs4_lock_state(void)
101{
353ab6e9 102 mutex_lock(&client_mutex);
1da177e4
LT		 103}
104
105void
106nfs4_unlock_state(void)
107{
353ab6e9 108 mutex_unlock(&client_mutex);
1da177e4
LT		 109}
110
111static inline u32
112opaque_hashval(const void *ptr, int nbytes)
113{
114 unsigned char *cptr = (unsigned char *) ptr;
115
116 u32 x = 0;
117 while (nbytes--) {
118 x *= 37;
119 x += *cptr++;
120 }
121 return x;
122}
123
1da177e4
LT		 124static struct list_head del_recall_lru;
125
13cd2184
N		 126static inline void
127put_nfs4_file(struct nfs4_file *fi)
128{
8b671b80
BF		 129 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
130 list_del(&fi->fi_hash);
131 spin_unlock(&recall_lock);
132 iput(fi->fi_inode);
133 kmem_cache_free(file_slab, fi);
134 }
13cd2184
N		 135}
136
137static inline void
138get_nfs4_file(struct nfs4_file *fi)
139{
8b671b80 140 atomic_inc(&fi->fi_ref);
13cd2184
N		 141}
142
ef0f3390 143static int num_delegations;
c2f1a551 144unsigned int max_delegations;
ef0f3390
N		 145
146/*
147 * Open owner state (share locks)
148 */
149
150/* hash tables for nfs4_stateowner */
151#define OWNER_HASH_BITS 8
152#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
153#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
154
155#define ownerid_hashval(id) \
156 ((id) & OWNER_HASH_MASK)
157#define ownerstr_hashval(clientid, ownername) \
158 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
159
160static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
161static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
162
163/* hash table for nfs4_file */
164#define FILE_HASH_BITS 8
165#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
166#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
167/* hash table for (open)nfs4_stateid */
168#define STATEID_HASH_BITS 10
169#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
170#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
171
172#define file_hashval(x) \
173 hash_ptr(x, FILE_HASH_BITS)
174#define stateid_hashval(owner_id, file_id) \
175 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
176
177static struct list_head file_hashtbl[FILE_HASH_SIZE];
178static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
179
1da177e4
LT		 180static struct nfs4_delegation *
181alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
182{
183 struct nfs4_delegation *dp;
184 struct nfs4_file *fp = stp->st_file;
185 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
186
187 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 188 if (fp->fi_had_conflict)
189 return NULL;
c2f1a551 190 if (num_delegations > max_delegations)
ef0f3390 191 return NULL;
5b2d21c1
N		 192 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
193 if (dp == NULL)
1da177e4 194 return dp;
ef0f3390 195 num_delegations++;
ea1da636
N		 196 INIT_LIST_HEAD(&dp->dl_perfile);
197 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 198 INIT_LIST_HEAD(&dp->dl_recall_lru);
199 dp->dl_client = clp;
13cd2184 200 get_nfs4_file(fp);
1da177e4
LT		 201 dp->dl_file = fp;
202 dp->dl_flock = NULL;
203 get_file(stp->st_vfs_file);
204 dp->dl_vfs_file = stp->st_vfs_file;
205 dp->dl_type = type;
206 dp->dl_recall.cbr_dp = NULL;
207 dp->dl_recall.cbr_ident = cb->cb_ident;
208 dp->dl_recall.cbr_trunc = 0;
209 dp->dl_stateid.si_boot = boot_time;
210 dp->dl_stateid.si_stateownerid = current_delegid++;
211 dp->dl_stateid.si_fileid = 0;
212 dp->dl_stateid.si_generation = 0;
6c02eaa1 213 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 214 dp->dl_time = 0;
215 atomic_set(&dp->dl_count, 1);
ea1da636
N		 216 list_add(&dp->dl_perfile, &fp->fi_delegations);
217 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 218 return dp;
219}
220
221void
222nfs4_put_delegation(struct nfs4_delegation *dp)
223{
224 if (atomic_dec_and_test(&dp->dl_count)) {
225 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 226 put_nfs4_file(dp->dl_file);
5b2d21c1 227 kmem_cache_free(deleg_slab, dp);
ef0f3390 228 num_delegations--;
1da177e4
LT		 229 }
230}
231
232/* Remove the associated file_lock first, then remove the delegation.
233 * lease_modify() is called to remove the FS_LEASE file_lock from
234 * the i_flock list, eventually calling nfsd's lock_manager
235 * fl_release_callback.
236 */
237static void
238nfs4_close_delegation(struct nfs4_delegation *dp)
239{
240 struct file *filp = dp->dl_vfs_file;
241
242 dprintk("NFSD: close_delegation dp %p\n",dp);
243 dp->dl_vfs_file = NULL;
244 /* The following nfsd_close may not actually close the file,
245 * but we want to remove the lease in any case. */
c907132d 246 if (dp->dl_flock)
a9933cea 247 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 248 nfsd_close(filp);
1da177e4
LT		 249}
250
251/* Called under the state lock. */
252static void
253unhash_delegation(struct nfs4_delegation *dp)
254{
ea1da636
N		 255 list_del_init(&dp->dl_perfile);
256 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 257 spin_lock(&recall_lock);
258 list_del_init(&dp->dl_recall_lru);
259 spin_unlock(&recall_lock);
260 nfs4_close_delegation(dp);
261 nfs4_put_delegation(dp);
262}
263
264/*
265 * SETCLIENTID state
266 */
267
268/* Hash tables for nfs4_clientid state */
269#define CLIENT_HASH_BITS 4
270#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
271#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
272
273#define clientid_hashval(id) \
274 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 275#define clientstr_hashval(name) \
276 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 277/*
278 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
279 * used in reboot/reset lease grace period processing
280 *
281 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
282 * setclientid_confirmed info.
283 *
284 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
285 * setclientid info.
286 *
287 * client_lru holds client queue ordered by nfs4_client.cl_time
288 * for lease renewal.
289 *
290 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
291 * for last close replay.
292 */
293static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
294static int reclaim_str_hashtbl_size = 0;
295static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
299static struct list_head client_lru;
300static struct list_head close_lru;
301
2283963f
BF		 302static void unhash_generic_stateid(struct nfs4_stateid *stp)
303{
304 list_del(&stp->st_hash);
305 list_del(&stp->st_perfile);
306 list_del(&stp->st_perstateowner);
307}
308
309static void free_generic_stateid(struct nfs4_stateid *stp)
310{
311 put_nfs4_file(stp->st_file);
312 kmem_cache_free(stateid_slab, stp);
313}
314
315static void release_lock_stateid(struct nfs4_stateid *stp)
316{
317 unhash_generic_stateid(stp);
318 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
319 free_generic_stateid(stp);
320}
321
f044ff83
BF		 322static void unhash_lockowner(struct nfs4_stateowner *sop)
323{
324 struct nfs4_stateid *stp;
325
326 list_del(&sop->so_idhash);
327 list_del(&sop->so_strhash);
328 list_del(&sop->so_perstateid);
329 while (!list_empty(&sop->so_stateids)) {
330 stp = list_first_entry(&sop->so_stateids,
331 struct nfs4_stateid, st_perstateowner);
332 release_lock_stateid(stp);
333 }
334}
335
336static void release_lockowner(struct nfs4_stateowner *sop)
337{
338 unhash_lockowner(sop);
339 nfs4_put_stateowner(sop);
340}
341
f1d110ca
BF		 342static void
343release_stateid_lockowners(struct nfs4_stateid *open_stp)
344{
345 struct nfs4_stateowner *lock_sop;
346
347 while (!list_empty(&open_stp->st_lockowners)) {
348 lock_sop = list_entry(open_stp->st_lockowners.next,
349 struct nfs4_stateowner, so_perstateid);
350 /* list_del(&open_stp->st_lockowners); */
351 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 352 release_lockowner(lock_sop);
f1d110ca
BF		 353 }
354}
355
2283963f
BF		 356static void release_open_stateid(struct nfs4_stateid *stp)
357{
358 unhash_generic_stateid(stp);
359 release_stateid_lockowners(stp);
360 nfsd_close(stp->st_vfs_file);
361 free_generic_stateid(stp);
362}
363
f044ff83 364static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 365{
366 struct nfs4_stateid *stp;
367
368 list_del(&sop->so_idhash);
369 list_del(&sop->so_strhash);
f044ff83
BF		 370 list_del(&sop->so_perclient);
371 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 372 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 373 stp = list_first_entry(&sop->so_stateids,
374 struct nfs4_stateid, st_perstateowner);
375 release_open_stateid(stp);
f1d110ca
BF		 376 }
377}
378
f044ff83 379static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 380{
f044ff83 381 unhash_openowner(sop);
f1d110ca
BF		 382 list_del(&sop->so_close_lru);
383 nfs4_put_stateowner(sop);
384}
385
5282fd72
ME		 386static DEFINE_SPINLOCK(sessionid_lock);
387#define SESSION_HASH_SIZE 512
388static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
389
390static inline int
391hash_sessionid(struct nfs4_sessionid *sessionid)
392{
393 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
394
395 return sid->sequence % SESSION_HASH_SIZE;
396}
397
398static inline void
399dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
400{
401 u32 *ptr = (u32 *)(&sessionid->data[0]);
402 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
403}
404
ec6b5d7b
AA		 405static void
406gen_sessionid(struct nfsd4_session *ses)
407{
408 struct nfs4_client *clp = ses->se_client;
409 struct nfsd4_sessionid *sid;
410
411 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
412 sid->clientid = clp->cl_clientid;
413 sid->sequence = current_sessionid++;
414 sid->reserved = 0;
415}
416
417/*
418 * Give the client the number of slots it requests bound by
419 * NFSD_MAX_SLOTS_PER_SESSION and by sv_drc_max_pages.
420 *
421 * If we run out of pages (sv_drc_pages_used == sv_drc_max_pages) we
422 * should (up to a point) re-negotiate active sessions and reduce their
423 * slot usage to make rooom for new connections. For now we just fail the
424 * create session.
425 */
426static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
427{
428 int status = 0, np = fchan->maxreqs * NFSD_PAGES_PER_SLOT;
429
430 spin_lock(&nfsd_serv->sv_lock);
431 if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
432 np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;
433 nfsd_serv->sv_drc_pages_used += np;
434 spin_unlock(&nfsd_serv->sv_lock);
435
436 if (np <= 0) {
437 status = nfserr_resource;
438 fchan->maxreqs = 0;
439 } else
440 fchan->maxreqs = np / NFSD_PAGES_PER_SLOT;
441
442 return status;
443}
444
445/*
446 * fchan holds the client values on input, and the server values on output
447 */
448static int init_forechannel_attrs(struct svc_rqst *rqstp,
449 struct nfsd4_session *session,
450 struct nfsd4_channel_attrs *fchan)
451{
452 int status = 0;
453 __u32 maxcount = svc_max_payload(rqstp);
454
455 /* headerpadsz set to zero in encode routine */
456
457 /* Use the client's max request and max response size if possible */
458 if (fchan->maxreq_sz > maxcount)
459 fchan->maxreq_sz = maxcount;
460 session->se_fmaxreq_sz = fchan->maxreq_sz;
461
462 if (fchan->maxresp_sz > maxcount)
463 fchan->maxresp_sz = maxcount;
464 session->se_fmaxresp_sz = fchan->maxresp_sz;
465
466 /* Set the max response cached size our default which is
467 * a multiple of PAGE_SIZE and small */
468 session->se_fmaxresp_cached = NFSD_PAGES_PER_SLOT * PAGE_SIZE;
469 fchan->maxresp_cached = session->se_fmaxresp_cached;
470
471 /* Use the client's maxops if possible */
472 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
473 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
474 session->se_fmaxops = fchan->maxops;
475
476 /* try to use the client requested number of slots */
477 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
478 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
479
480 /* FIXME: Error means no more DRC pages so the server should
481 * recover pages from existing sessions. For now fail session
482 * creation.
483 */
484 status = set_forechannel_maxreqs(fchan);
485
486 session->se_fnumslots = fchan->maxreqs;
487 return status;
488}
489
490static int
491alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
492 struct nfsd4_create_session *cses)
493{
494 struct nfsd4_session *new, tmp;
495 int idx, status = nfserr_resource, slotsize;
496
497 memset(&tmp, 0, sizeof(tmp));
498
499 /* FIXME: For now, we just accept the client back channel attributes. */
500 status = init_forechannel_attrs(rqstp, &tmp, &cses->fore_channel);
501 if (status)
502 goto out;
503
504 /* allocate struct nfsd4_session and slot table in one piece */
505 slotsize = tmp.se_fnumslots * sizeof(struct nfsd4_slot);
506 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
507 if (!new)
508 goto out;
509
510 memcpy(new, &tmp, sizeof(*new));
511
512 new->se_client = clp;
513 gen_sessionid(new);
514 idx = hash_sessionid(&new->se_sessionid);
515 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
516 NFS4_MAX_SESSIONID_LEN);
517
518 new->se_flags = cses->flags;
519 kref_init(&new->se_ref);
520 spin_lock(&sessionid_lock);
521 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
522 list_add(&new->se_perclnt, &clp->cl_sessions);
523 spin_unlock(&sessionid_lock);
524
525 status = nfs_ok;
526out:
527 return status;
528}
529
5282fd72
ME		 530/* caller must hold sessionid_lock */
531static struct nfsd4_session *
532find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
533{
534 struct nfsd4_session *elem;
535 int idx;
536
537 dump_sessionid(__func__, sessionid);
538 idx = hash_sessionid(sessionid);
539 dprintk("%s: idx is %d\n", __func__, idx);
540 /* Search in the appropriate list */
541 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
542 dump_sessionid("list traversal", &elem->se_sessionid);
543 if (!memcmp(elem->se_sessionid.data, sessionid->data,
544 NFS4_MAX_SESSIONID_LEN)) {
545 return elem;
546 }
547 }
548
549 dprintk("%s: session not found\n", __func__);
550 return NULL;
551}
552
553/* caller must hold sessionid_lock */
7116ed6b 554static void
5282fd72 555unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 556{
557 list_del(&ses->se_hash);
558 list_del(&ses->se_perclnt);
5282fd72
ME		 559}
560
561static void
562release_session(struct nfsd4_session *ses)
563{
564 spin_lock(&sessionid_lock);
565 unhash_session(ses);
566 spin_unlock(&sessionid_lock);
7116ed6b
AA		 567 nfsd4_put_session(ses);
568}
569
14778a13
AA		 570static void nfsd4_release_respages(struct page **respages, short resused);
571
7116ed6b
AA		 572void
573free_session(struct kref *kref)
574{
575 struct nfsd4_session *ses;
14778a13 576 int i;
7116ed6b
AA		 577
578 ses = container_of(kref, struct nfsd4_session, se_ref);
14778a13
AA		 579 for (i = 0; i < ses->se_fnumslots; i++) {
580 struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
581 nfsd4_release_respages(e->ce_respages, e->ce_resused);
582 }
7116ed6b
AA		 583 kfree(ses->se_slots);
584 kfree(ses);
585}
586
1da177e4
LT		 587static inline void
588renew_client(struct nfs4_client *clp)
589{
590 /*
591 * Move client to the end to the LRU list.
592 */
593 dprintk("renewing client (clientid %08x/%08x)\n",
594 clp->cl_clientid.cl_boot,
595 clp->cl_clientid.cl_id);
596 list_move_tail(&clp->cl_lru, &client_lru);
597 clp->cl_time = get_seconds();
598}
599
600/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
601static int
602STALE_CLIENTID(clientid_t *clid)
603{
604 if (clid->cl_boot == boot_time)
605 return 0;
606 dprintk("NFSD stale clientid (%08x/%08x)\n",
607 clid->cl_boot, clid->cl_id);
608 return 1;
609}
610
611/*
612 * XXX Should we use a slab cache ?
613 * This type of memory management is somewhat inefficient, but we use it
614 * anyway since SETCLIENTID is not a common operation.
615 */
35bba9a3 616static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 617{
618 struct nfs4_client *clp;
619
35bba9a3
BF		 620 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
621 if (clp == NULL)
622 return NULL;
623 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
624 if (clp->cl_name.data == NULL) {
625 kfree(clp);
626 return NULL;
1da177e4 627 }
35bba9a3
BF		 628 memcpy(clp->cl_name.data, name.data, name.len);
629 clp->cl_name.len = name.len;
1da177e4
LT		 630 return clp;
631}
632
1b1a9b31
BF		 633static void
634shutdown_callback_client(struct nfs4_client *clp)
635{
636 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
637
1b1a9b31 638 if (clnt) {
404ec117
BF		 639 /*
640 * Callback threads take a reference on the client, so there
641 * should be no outstanding callbacks at this point.
642 */
1b1a9b31
BF		 643 clp->cl_callback.cb_client = NULL;
644 rpc_shutdown_client(clnt);
645 }
646}
647
1da177e4
LT		 648static inline void
649free_client(struct nfs4_client *clp)
650{
1b1a9b31 651 shutdown_callback_client(clp);
38eb76a5
AA		 652 nfsd4_release_respages(clp->cl_slot.sl_cache_entry.ce_respages,
653 clp->cl_slot.sl_cache_entry.ce_resused);
1da177e4
LT		 654 if (clp->cl_cred.cr_group_info)
655 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 656 kfree(clp->cl_principal);
1da177e4
LT		 657 kfree(clp->cl_name.data);
658 kfree(clp);
659}
660
661void
662put_nfs4_client(struct nfs4_client *clp)
663{
664 if (atomic_dec_and_test(&clp->cl_count))
665 free_client(clp);
666}
667
668static void
669expire_client(struct nfs4_client *clp)
670{
671 struct nfs4_stateowner *sop;
672 struct nfs4_delegation *dp;
1da177e4
LT		 673 struct list_head reaplist;
674
675 dprintk("NFSD: expire_client cl_count %d\n",
676 atomic_read(&clp->cl_count));
677
1da177e4
LT		 678 INIT_LIST_HEAD(&reaplist);
679 spin_lock(&recall_lock);
ea1da636
N		 680 while (!list_empty(&clp->cl_delegations)) {
681 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 682 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
683 dp->dl_flock);
ea1da636 684 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 685 list_move(&dp->dl_recall_lru, &reaplist);
686 }
687 spin_unlock(&recall_lock);
688 while (!list_empty(&reaplist)) {
689 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
690 list_del_init(&dp->dl_recall_lru);
691 unhash_delegation(dp);
692 }
693 list_del(&clp->cl_idhash);
694 list_del(&clp->cl_strhash);
695 list_del(&clp->cl_lru);
ea1da636
N		 696 while (!list_empty(&clp->cl_openowners)) {
697 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 698 release_openowner(sop);
1da177e4 699 }
c4bf7868
ME		 700 while (!list_empty(&clp->cl_sessions)) {
701 struct nfsd4_session *ses;
702 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
703 se_perclnt);
704 release_session(ses);
705 }
1da177e4
LT		 706 put_nfs4_client(clp);
707}
708
35bba9a3
BF		 709static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
710{
1da177e4
LT		 711 struct nfs4_client *clp;
712
35bba9a3
BF		 713 clp = alloc_client(name);
714 if (clp == NULL)
715 return NULL;
a55370a3 716 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 717 atomic_set(&clp->cl_count, 1);
718 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 719 INIT_LIST_HEAD(&clp->cl_idhash);
720 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 721 INIT_LIST_HEAD(&clp->cl_openowners);
722 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 723 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 724 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 725 return clp;
726}
727
35bba9a3
BF		 728static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
729{
730 memcpy(target->cl_verifier.data, source->data,
731 sizeof(target->cl_verifier.data));
1da177e4
LT		 732}
733
35bba9a3
BF		 734static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
735{
1da177e4
LT		 736 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
737 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
738}
739
35bba9a3
BF		 740static void copy_cred(struct svc_cred *target, struct svc_cred *source)
741{
1da177e4
LT		 742 target->cr_uid = source->cr_uid;
743 target->cr_gid = source->cr_gid;
744 target->cr_group_info = source->cr_group_info;
745 get_group_info(target->cr_group_info);
746}
747
35bba9a3 748static int same_name(const char *n1, const char *n2)
599e0a22 749{
a55370a3 750 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 751}
752
753static int
599e0a22
BF		 754same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
755{
756 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 757}
758
759static int
599e0a22
BF		 760same_clid(clientid_t *cl1, clientid_t *cl2)
761{
762 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 763}
764
765/* XXX what about NGROUP */
766static int
599e0a22
BF		 767same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
768{
769 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 770}
771
5ec7b46c
BF		 772static void gen_clid(struct nfs4_client *clp)
773{
774 static u32 current_clientid = 1;
775
1da177e4
LT		 776 clp->cl_clientid.cl_boot = boot_time;
777 clp->cl_clientid.cl_id = current_clientid++;
778}
779
deda2faa
BF		 780static void gen_confirm(struct nfs4_client *clp)
781{
782 static u32 i;
783 u32 *p;
1da177e4 784
1da177e4 785 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 786 *p++ = get_seconds();
787 *p++ = i++;
1da177e4
LT		 788}
789
35bba9a3
BF		 790static int check_name(struct xdr_netobj name)
791{
1da177e4
LT		 792 if (name.len == 0)
793 return 0;
794 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 795 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 796 return 0;
797 }
798 return 1;
799}
800
fd39ca9a 801static void
1da177e4
LT		 802add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
803{
804 unsigned int idhashval;
805
806 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
807 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
808 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
809 list_add_tail(&clp->cl_lru, &client_lru);
810 clp->cl_time = get_seconds();
811}
812
fd39ca9a 813static void
1da177e4
LT		 814move_to_confirmed(struct nfs4_client *clp)
815{
816 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
817 unsigned int strhashval;
818
819 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
820 list_del_init(&clp->cl_strhash);
f116629d 821 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 822 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 823 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
824 renew_client(clp);
825}
826
827static struct nfs4_client *
828find_confirmed_client(clientid_t *clid)
829{
830 struct nfs4_client *clp;
831 unsigned int idhashval = clientid_hashval(clid->cl_id);
832
833 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 834 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 835 return clp;
836 }
837 return NULL;
838}
839
840static struct nfs4_client *
841find_unconfirmed_client(clientid_t *clid)
842{
843 struct nfs4_client *clp;
844 unsigned int idhashval = clientid_hashval(clid->cl_id);
845
846 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 847 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 848 return clp;
849 }
850 return NULL;
851}
852
a1bcecd2
AA		 853/*
854 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
855 * parameter. Matching is based on the fact the at least one of the
856 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
857 *
858 * FIXME: we need to unify the clientid namespaces for nfsv4.x
859 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
860 * and SET_CLIENTID{,_CONFIRM}
861 */
862static inline int
863match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
864{
865 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
866 return use_exchange_id == has_exchange_flags;
867}
868
28ce6054 869static struct nfs4_client *
a1bcecd2
AA		 870find_confirmed_client_by_str(const char *dname, unsigned int hashval,
871 bool use_exchange_id)
28ce6054
N		 872{
873 struct nfs4_client *clp;
874
875 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 876 if (same_name(clp->cl_recdir, dname) &&
877 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 878 return clp;
879 }
880 return NULL;
881}
882
883static struct nfs4_client *
a1bcecd2
AA		 884find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
885 bool use_exchange_id)
28ce6054
N		 886{
887 struct nfs4_client *clp;
888
889 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 890 if (same_name(clp->cl_recdir, dname) &&
891 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 892 return clp;
893 }
894 return NULL;
895}
896
1da177e4
LT		 897/* a helper function for parse_callback */
898static int
899parse_octet(unsigned int *lenp, char **addrp)
900{
901 unsigned int len = *lenp;
902 char *p = *addrp;
903 int n = -1;
904 char c;
905
906 for (;;) {
907 if (!len)
908 break;
909 len--;
910 c = *p++;
911 if (c == '.')
912 break;
913 if ((c < '0') || (c > '9')) {
914 n = -1;
915 break;
916 }
917 if (n < 0)
918 n = 0;
919 n = (n * 10) + (c - '0');
920 if (n > 255) {
921 n = -1;
922 break;
923 }
924 }
925 *lenp = len;
926 *addrp = p;
927 return n;
928}
929
930/* parse and set the setclientid ipv4 callback address */
fd39ca9a 931static int
1da177e4
LT		 932parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
933{
934 int temp = 0;
935 u32 cbaddr = 0;
936 u16 cbport = 0;
937 u32 addrlen = addr_len;
938 char *addr = addr_val;
939 int i, shift;
940
941 /* ipaddress */
942 shift = 24;
943 for(i = 4; i > 0 ; i--) {
944 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
945 return 0;
946 }
947 cbaddr |= (temp << shift);
948 if (shift > 0)
949 shift -= 8;
950 }
951 *cbaddrp = cbaddr;
952
953 /* port */
954 shift = 8;
955 for(i = 2; i > 0 ; i--) {
956 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
957 return 0;
958 }
959 cbport |= (temp << shift);
960 if (shift > 0)
961 shift -= 8;
962 }
963 *cbportp = cbport;
964 return 1;
965}
966
fd39ca9a 967static void
1da177e4
LT		 968gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
969{
970 struct nfs4_callback *cb = &clp->cl_callback;
971
972 /* Currently, we only support tcp for the callback channel */
973 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
974 goto out_err;
975
976 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
977 &cb->cb_addr, &cb->cb_port)))
978 goto out_err;
979 cb->cb_prog = se->se_callback_prog;
980 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 981 return;
982out_err:
849823c5 983 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 984 "will not receive delegations\n",
985 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
986
1da177e4
LT		 987 return;
988}
989
074fe897
AA		 990void
991nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
992{
993 struct nfsd4_compoundres *resp = rqstp->rq_resp;
994
995 resp->cstate.statp = statp;
996}
997
998/*
999 * Dereference the result pages.
1000 */
1001static void
1002nfsd4_release_respages(struct page **respages, short resused)
1003{
1004 int i;
1005
1006 dprintk("--> %s\n", __func__);
1007 for (i = 0; i < resused; i++) {
1008 if (!respages[i])
1009 continue;
1010 put_page(respages[i]);
1011 respages[i] = NULL;
1012 }
1013}
1014
1015static void
1016nfsd4_copy_pages(struct page **topages, struct page **frompages, short count)
1017{
1018 int i;
1019
1020 for (i = 0; i < count; i++) {
1021 topages[i] = frompages[i];
1022 if (!topages[i])
1023 continue;
1024 get_page(topages[i]);
1025 }
1026}
1027
1028/*
1029 * Cache the reply pages up to NFSD_PAGES_PER_SLOT + 1, clearing the previous
1030 * pages. We add a page to NFSD_PAGES_PER_SLOT for the case where the total
1031 * length of the XDR response is less than se_fmaxresp_cached
1032 * (NFSD_PAGES_PER_SLOT * PAGE_SIZE) but the xdr_buf pages is used for a
1033 * of the reply (e.g. readdir).
1034 *
1035 * Store the base and length of the rq_req.head[0] page
1036 * of the NFSv4.1 data, just past the rpc header.
1037 */
1038void
1039nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1040{
1041 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1042 struct svc_rqst *rqstp = resp->rqstp;
1043 struct nfsd4_compoundargs *args = rqstp->rq_argp;
1044 struct nfsd4_op *op = &args->ops[resp->opcnt];
1045 struct kvec *resv = &rqstp->rq_res.head[0];
1046
1047 dprintk("--> %s entry %p\n", __func__, entry);
1048
1049 /* Don't cache a failed OP_SEQUENCE. */
1050 if (resp->opcnt == 1 && op->opnum == OP_SEQUENCE && resp->cstate.status)
1051 return;
1052 nfsd4_release_respages(entry->ce_respages, entry->ce_resused);
1053 entry->ce_resused = rqstp->rq_resused;
1054 if (entry->ce_resused > NFSD_PAGES_PER_SLOT + 1)
1055 entry->ce_resused = NFSD_PAGES_PER_SLOT + 1;
1056 nfsd4_copy_pages(entry->ce_respages, rqstp->rq_respages,
1057 entry->ce_resused);
1058 entry->ce_status = resp->cstate.status;
1059 entry->ce_datav.iov_base = resp->cstate.statp;
1060 entry->ce_datav.iov_len = resv->iov_len - ((char *)resp->cstate.statp -
1061 (char *)page_address(rqstp->rq_respages[0]));
1062 entry->ce_opcnt = resp->opcnt;
1063 /* Current request rpc header length*/
1064 entry->ce_rpchdrlen = (char *)resp->cstate.statp -
1065 (char *)page_address(rqstp->rq_respages[0]);
1066}
1067
1068/*
1069 * We keep the rpc header, but take the nfs reply from the replycache.
1070 */
1071static int
1072nfsd41_copy_replay_data(struct nfsd4_compoundres *resp,
1073 struct nfsd4_cache_entry *entry)
1074{
1075 struct svc_rqst *rqstp = resp->rqstp;
1076 struct kvec *resv = &resp->rqstp->rq_res.head[0];
1077 int len;
1078
1079 /* Current request rpc header length*/
1080 len = (char *)resp->cstate.statp -
1081 (char *)page_address(rqstp->rq_respages[0]);
1082 if (entry->ce_datav.iov_len + len > PAGE_SIZE) {
1083 dprintk("%s v41 cached reply too large (%Zd).\n", __func__,
1084 entry->ce_datav.iov_len);
1085 return 0;
1086 }
1087 /* copy the cached reply nfsd data past the current rpc header */
1088 memcpy((char *)resv->iov_base + len, entry->ce_datav.iov_base,
1089 entry->ce_datav.iov_len);
1090 resv->iov_len = len + entry->ce_datav.iov_len;
1091 return 1;
1092}
1093
1094/*
1095 * Keep the first page of the replay. Copy the NFSv4.1 data from the first
1096 * cached page. Replace any futher replay pages from the cache.
1097 */
1098__be32
1099nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp)
1100{
1101 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1102 __be32 status;
1103
1104 dprintk("--> %s entry %p\n", __func__, entry);
1105
1106
1107 if (!nfsd41_copy_replay_data(resp, entry)) {
1108 /*
1109 * Not enough room to use the replay rpc header, send the
1110 * cached header. Release all the allocated result pages.
1111 */
1112 svc_free_res_pages(resp->rqstp);
1113 nfsd4_copy_pages(resp->rqstp->rq_respages, entry->ce_respages,
1114 entry->ce_resused);
1115 } else {
1116 /* Release all but the first allocated result page */
1117
1118 resp->rqstp->rq_resused--;
1119 svc_free_res_pages(resp->rqstp);
1120
1121 nfsd4_copy_pages(&resp->rqstp->rq_respages[1],
1122 &entry->ce_respages[1],
1123 entry->ce_resused - 1);
1124 }
1125
1126 resp->rqstp->rq_resused = entry->ce_resused;
da3846a2
AA		 1127 resp->opcnt = entry->ce_opcnt;
1128 resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
074fe897
AA		 1129 status = entry->ce_status;
1130
1131 return status;
1132}
1133
0733d213
AA		 1134/*
1135 * Set the exchange_id flags returned by the server.
1136 */
1137static void
1138nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1139{
1140 /* pNFS is not supported */
1141 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1142
1143 /* Referrals are supported, Migration is not. */
1144 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1145
1146 /* set the wire flags to return to client. */
1147 clid->flags = new->cl_exchange_flags;
1148}
1149
069b6ad4
AA		 1150__be32
1151nfsd4_exchange_id(struct svc_rqst *rqstp,
1152 struct nfsd4_compound_state *cstate,
1153 struct nfsd4_exchange_id *exid)
1154{
0733d213
AA		 1155 struct nfs4_client *unconf, *conf, *new;
1156 int status;
1157 unsigned int strhashval;
1158 char dname[HEXDIR_LEN];
1159 nfs4_verifier verf = exid->verifier;
1160 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
1161
1162 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1163 " ip_addr=%u flags %x, spa_how %d\n",
1164 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1165 ip_addr, exid->flags, exid->spa_how);
1166
1167 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1168 return nfserr_inval;
1169
1170 /* Currently only support SP4_NONE */
1171 switch (exid->spa_how) {
1172 case SP4_NONE:
1173 break;
1174 case SP4_SSV:
1175 return nfserr_encr_alg_unsupp;
1176 default:
1177 BUG(); /* checked by xdr code */
1178 case SP4_MACH_CRED:
1179 return nfserr_serverfault; /* no excuse :-/ */
1180 }
1181
1182 status = nfs4_make_rec_clidname(dname, &exid->clname);
1183
1184 if (status)
1185 goto error;
1186
1187 strhashval = clientstr_hashval(dname);
1188
1189 nfs4_lock_state();
1190 status = nfs_ok;
1191
a1bcecd2 1192 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1193 if (conf) {
1194 if (!same_verf(&verf, &conf->cl_verifier)) {
1195 /* 18.35.4 case 8 */
1196 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1197 status = nfserr_not_same;
1198 goto out;
1199 }
1200 /* Client reboot: destroy old state */
1201 expire_client(conf);
1202 goto out_new;
1203 }
1204 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1205 /* 18.35.4 case 9 */
1206 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1207 status = nfserr_perm;
1208 goto out;
1209 }
1210 expire_client(conf);
1211 goto out_new;
1212 }
1213 if (ip_addr != conf->cl_addr &&
1214 !(exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)) {
1215 /* Client collision. 18.35.4 case 3 */
1216 status = nfserr_clid_inuse;
1217 goto out;
1218 }
1219 /*
1220 * Set bit when the owner id and verifier map to an already
1221 * confirmed client id (18.35.3).
1222 */
1223 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1224
1225 /*
1226 * Falling into 18.35.4 case 2, possible router replay.
1227 * Leave confirmed record intact and return same result.
1228 */
1229 copy_verf(conf, &verf);
1230 new = conf;
1231 goto out_copy;
1232 } else {
1233 /* 18.35.4 case 7 */
1234 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1235 status = nfserr_noent;
1236 goto out;
1237 }
1238 }
1239
a1bcecd2 1240 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1241 if (unconf) {
1242 /*
1243 * Possible retry or client restart. Per 18.35.4 case 4,
1244 * a new unconfirmed record should be generated regardless
1245 * of whether any properties have changed.
1246 */
1247 expire_client(unconf);
1248 }
1249
1250out_new:
1251 /* Normal case */
1252 new = create_client(exid->clname, dname);
1253 if (new == NULL) {
1254 status = nfserr_resource;
1255 goto out;
1256 }
1257
1258 copy_verf(new, &verf);
1259 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1260 new->cl_addr = ip_addr;
1261 gen_clid(new);
1262 gen_confirm(new);
1263 add_to_unconfirmed(new, strhashval);
1264out_copy:
1265 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1266 exid->clientid.cl_id = new->cl_clientid.cl_id;
1267
38eb76a5
AA		 1268 new->cl_slot.sl_seqid = 0;
1269 exid->seqid = 1;
0733d213
AA		 1270 nfsd4_set_ex_flags(new, exid);
1271
1272 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
38eb76a5 1273 new->cl_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1274 status = nfs_ok;
1275
1276out:
1277 nfs4_unlock_state();
1278error:
1279 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1280 return status;
069b6ad4
AA		 1281}
1282
b85d4c01
BH		 1283static int
1284check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
1285{
1286 dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
1287 slot->sl_seqid);
1288
1289 /* The slot is in use, and no response has been sent. */
1290 if (slot->sl_inuse) {
1291 if (seqid == slot->sl_seqid)
1292 return nfserr_jukebox;
1293 else
1294 return nfserr_seq_misordered;
1295 }
1296 /* Normal */
1297 if (likely(seqid == slot->sl_seqid + 1))
1298 return nfs_ok;
1299 /* Replay */
1300 if (seqid == slot->sl_seqid)
1301 return nfserr_replay_cache;
1302 /* Wraparound */
1303 if (seqid == 1 && (slot->sl_seqid + 1) == 0)
1304 return nfs_ok;
1305 /* Misordered replay or misordered new request */
1306 return nfserr_seq_misordered;
1307}
1308
069b6ad4
AA		 1309__be32
1310nfsd4_create_session(struct svc_rqst *rqstp,
1311 struct nfsd4_compound_state *cstate,
1312 struct nfsd4_create_session *cr_ses)
1313{
ec6b5d7b 1314 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
38eb76a5 1315 struct nfsd4_compoundres *resp = rqstp->rq_resp;
ec6b5d7b 1316 struct nfs4_client *conf, *unconf;
38eb76a5 1317 struct nfsd4_slot *slot = NULL;
ec6b5d7b
AA		 1318 int status = 0;
1319
1320 nfs4_lock_state();
1321 unconf = find_unconfirmed_client(&cr_ses->clientid);
1322 conf = find_confirmed_client(&cr_ses->clientid);
1323
1324 if (conf) {
38eb76a5
AA		 1325 slot = &conf->cl_slot;
1326 status = check_slot_seqid(cr_ses->seqid, slot);
1327 if (status == nfserr_replay_cache) {
ec6b5d7b 1328 dprintk("Got a create_session replay! seqid= %d\n",
38eb76a5
AA		 1329 slot->sl_seqid);
1330 cstate->slot = slot;
1331 cstate->status = status;
1332 /* Return the cached reply status */
1333 status = nfsd4_replay_cache_entry(resp);
1334 goto out;
1335 } else if (cr_ses->seqid != conf->cl_slot.sl_seqid + 1) {
ec6b5d7b
AA		 1336 status = nfserr_seq_misordered;
1337 dprintk("Sequence misordered!\n");
1338 dprintk("Expected seqid= %d but got seqid= %d\n",
38eb76a5 1339 slot->sl_seqid, cr_ses->seqid);
ec6b5d7b
AA		 1340 goto out;
1341 }
38eb76a5 1342 conf->cl_slot.sl_seqid++;
ec6b5d7b
AA		 1343 } else if (unconf) {
1344 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1345 (ip_addr != unconf->cl_addr)) {
1346 status = nfserr_clid_inuse;
1347 goto out;
1348 }
1349
38eb76a5
AA		 1350 slot = &unconf->cl_slot;
1351 status = check_slot_seqid(cr_ses->seqid, slot);
1352 if (status) {
1353 /* an unconfirmed replay returns misordered */
ec6b5d7b
AA		 1354 status = nfserr_seq_misordered;
1355 goto out;
1356 }
1357
38eb76a5 1358 slot->sl_seqid++; /* from 0 to 1 */
ec6b5d7b
AA		 1359 move_to_confirmed(unconf);
1360
1361 /*
1362 * We do not support RDMA or persistent sessions
1363 */
1364 cr_ses->flags &= ~SESSION4_PERSIST;
1365 cr_ses->flags &= ~SESSION4_RDMA;
1366
1367 conf = unconf;
1368 } else {
1369 status = nfserr_stale_clientid;
1370 goto out;
1371 }
1372
1373 status = alloc_init_session(rqstp, conf, cr_ses);
1374 if (status)
1375 goto out;
1376
ec6b5d7b
AA		 1377 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1378 NFS4_MAX_SESSIONID_LEN);
38eb76a5 1379 cr_ses->seqid = slot->sl_seqid;
ec6b5d7b 1380
38eb76a5
AA		 1381 slot->sl_inuse = true;
1382 cstate->slot = slot;
ec6b5d7b
AA		 1383out:
1384 nfs4_unlock_state();
1385 dprintk("%s returns %d\n", __func__, ntohl(status));
1386 return status;
069b6ad4
AA		 1387}
1388
1389__be32
1390nfsd4_destroy_session(struct svc_rqst *r,
1391 struct nfsd4_compound_state *cstate,
1392 struct nfsd4_destroy_session *sessionid)
1393{
1394 return -1; /* stub */
1395}
1396
1397__be32
b85d4c01 1398nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1399 struct nfsd4_compound_state *cstate,
1400 struct nfsd4_sequence *seq)
1401{
f9bb94c4 1402 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1403 struct nfsd4_session *session;
1404 struct nfsd4_slot *slot;
1405 int status;
1406
f9bb94c4
AA		 1407 if (resp->opcnt != 1)
1408 return nfserr_sequence_pos;
1409
b85d4c01
BH		 1410 spin_lock(&sessionid_lock);
1411 status = nfserr_badsession;
1412 session = find_in_sessionid_hashtbl(&seq->sessionid);
1413 if (!session)
1414 goto out;
1415
1416 status = nfserr_badslot;
1417 if (seq->slotid >= session->se_fnumslots)
1418 goto out;
1419
1420 slot = &session->se_slots[seq->slotid];
1421 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1422
1423 status = check_slot_seqid(seq->seqid, slot);
1424 if (status == nfserr_replay_cache) {
1425 cstate->slot = slot;
1426 cstate->session = session;
da3846a2
AA		 1427 /* Return the cached reply status and set cstate->status
1428 * for nfsd4_svc_encode_compoundres processing*/
1429 status = nfsd4_replay_cache_entry(resp);
1430 cstate->status = nfserr_replay_cache;
b85d4c01
BH		 1431 goto replay_cache;
1432 }
1433 if (status)
1434 goto out;
1435
1436 /* Success! bump slot seqid */
1437 slot->sl_inuse = true;
1438 slot->sl_seqid = seq->seqid;
1439
1440 cstate->slot = slot;
1441 cstate->session = session;
1442
1443replay_cache:
1444 /* Renew the clientid on success and on replay.
1445 * Hold a session reference until done processing the compound:
1446 * nfsd4_put_session called only if the cstate slot is set.
1447 */
1448 renew_client(session->se_client);
1449 nfsd4_get_session(session);
1450out:
1451 spin_unlock(&sessionid_lock);
1452 dprintk("%s: return %d\n", __func__, ntohl(status));
1453 return status;
069b6ad4
AA		 1454}
1455
b37ad28b 1456__be32
b591480b
BF		 1457nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1458 struct nfsd4_setclientid *setclid)
1da177e4 1459{
27459f09 1460 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1461 struct xdr_netobj clname = {
1462 .len = setclid->se_namelen,
1463 .data = setclid->se_name,
1464 };
1465 nfs4_verifier clverifier = setclid->se_verf;
1466 unsigned int strhashval;
28ce6054 1467 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1468 __be32 status;
68e76ad0 1469 char *princ;
a55370a3 1470 char dname[HEXDIR_LEN];
1da177e4 1471
1da177e4 1472 if (!check_name(clname))
73aea4ec 1473 return nfserr_inval;
1da177e4 1474
a55370a3
N		 1475 status = nfs4_make_rec_clidname(dname, &clname);
1476 if (status)
73aea4ec 1477 return status;
a55370a3 1478
1da177e4
LT		 1479 /*
1480 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1481 * We get here on a DRC miss.
1482 */
1483
a55370a3 1484 strhashval = clientstr_hashval(dname);
1da177e4 1485
1da177e4 1486 nfs4_lock_state();
a1bcecd2 1487 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1488 if (conf) {
a186e767 1489 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1490 status = nfserr_clid_inuse;
026722c2
BF		 1491 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1492 dprintk("NFSD: setclientid: string in use by client"
1493 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1494 goto out;
1495 }
1da177e4 1496 }
a186e767
BF		 1497 /*
1498 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1499 * has a description of SETCLIENTID request processing consisting
1500 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1501 */
a1bcecd2 1502 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1503 status = nfserr_resource;
1504 if (!conf) {
a186e767
BF		 1505 /*
1506 * RFC 3530 14.2.33 CASE 4:
1507 * placed first, because it is the normal case
1da177e4
LT		 1508 */
1509 if (unconf)
1510 expire_client(unconf);
a55370a3
N		 1511 new = create_client(clname, dname);
1512 if (new == NULL)
1da177e4 1513 goto out;
1da177e4 1514 gen_clid(new);
599e0a22 1515 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1516 /*
a186e767
BF		 1517 * RFC 3530 14.2.33 CASE 1:
1518 * probable callback update
1da177e4 1519 */
31f4a6c1
N		 1520 if (unconf) {
1521 /* Note this is removing unconfirmed {*x***},
1522 * which is stronger than RFC recommended {vxc**}.
1523 * This has the advantage that there is at most
1524 * one {*x***} in either list at any time.
1525 */
1526 expire_client(unconf);
1da177e4 1527 }
a55370a3
N		 1528 new = create_client(clname, dname);
1529 if (new == NULL)
1da177e4 1530 goto out;
1da177e4 1531 copy_clid(new, conf);
1da177e4
LT		 1532 } else if (!unconf) {
1533 /*
a186e767
BF		 1534 * RFC 3530 14.2.33 CASE 2:
1535 * probable client reboot; state will be removed if
1536 * confirmed.
1da177e4 1537 */
a55370a3
N		 1538 new = create_client(clname, dname);
1539 if (new == NULL)
1da177e4 1540 goto out;
1da177e4 1541 gen_clid(new);
49ba8781 1542 } else {
a186e767
BF		 1543 /*
1544 * RFC 3530 14.2.33 CASE 3:
1545 * probable client reboot; state will be removed if
1546 * confirmed.
1da177e4
LT		 1547 */
1548 expire_client(unconf);
a55370a3
N		 1549 new = create_client(clname, dname);
1550 if (new == NULL)
1da177e4 1551 goto out;
1da177e4 1552 gen_clid(new);
1da177e4 1553 }
c175b83c
BF		 1554 copy_verf(new, &clverifier);
1555 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1556 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1557 princ = svc_gss_principal(rqstp);
1558 if (princ) {
1559 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1560 if (new->cl_principal == NULL) {
1561 free_client(new);
1562 goto out;
1563 }
1564 }
c175b83c
BF		 1565 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1566 gen_confirm(new);
1567 gen_callback(new, setclid);
1568 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1569 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1570 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1571 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1572 status = nfs_ok;
1573out:
1574 nfs4_unlock_state();
1575 return status;
1576}
1577
1578
1579/*
a186e767
BF		 1580 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1581 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1582 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1583 */
b37ad28b 1584__be32
b591480b
BF		 1585nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1586 struct nfsd4_compound_state *cstate,
1587 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1588{
27459f09 1589 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1590 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1591 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1592 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1593 __be32 status;
1da177e4
LT		 1594
1595 if (STALE_CLIENTID(clid))
1596 return nfserr_stale_clientid;
1597 /*
1598 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1599 * We get here on a DRC miss.
1600 */
1601
1602 nfs4_lock_state();
21ab45a4
N		 1603
1604 conf = find_confirmed_client(clid);
1605 unconf = find_unconfirmed_client(clid);
1606
1607 status = nfserr_clid_inuse;
27459f09 1608 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1609 goto out;
27459f09 1610 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1611 goto out;
1612
a186e767
BF		 1613 /*
1614 * section 14.2.34 of RFC 3530 has a description of
1615 * SETCLIENTID_CONFIRM request processing consisting
1616 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1617 */
366e0c1d 1618 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1619 /*
1620 * RFC 3530 14.2.34 CASE 1:
1621 * callback update
1622 */
599e0a22 1623 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1624 status = nfserr_clid_inuse;
1625 else {
1a69c179
N		 1626 /* XXX: We just turn off callbacks until we can handle
1627 * change request correctly. */
cb36d634 1628 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1629 gen_confirm(conf);
46309029 1630 nfsd4_remove_clid_dir(unconf);
1a69c179 1631 expire_client(unconf);
1da177e4 1632 status = nfs_ok;
1a69c179 1633
1da177e4 1634 }
f3aba4e5 1635 } else if (conf && !unconf) {
a186e767
BF		 1636 /*
1637 * RFC 3530 14.2.34 CASE 2:
1638 * probable retransmitted request; play it safe and
1639 * do nothing.
7c79f737 1640 */
599e0a22 1641 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1642 status = nfserr_clid_inuse;
21ab45a4 1643 else
1da177e4 1644 status = nfs_ok;
7c79f737 1645 } else if (!conf && unconf
599e0a22 1646 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1647 /*
1648 * RFC 3530 14.2.34 CASE 3:
1649 * Normal case; new or rebooted client:
7c79f737 1650 */
599e0a22 1651 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1652 status = nfserr_clid_inuse;
1653 } else {
1a69c179
N		 1654 unsigned int hash =
1655 clientstr_hashval(unconf->cl_recdir);
1656 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1657 hash, false);
1a69c179 1658 if (conf) {
c7b9a459 1659 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1660 expire_client(conf);
1661 }
1da177e4 1662 move_to_confirmed(unconf);
21ab45a4 1663 conf = unconf;
46f8a64b 1664 nfsd4_probe_callback(conf);
1a69c179 1665 status = nfs_ok;
1da177e4 1666 }
599e0a22
BF		 1667 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1668 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1669 &confirm)))) {
a186e767
BF		 1670 /*
1671 * RFC 3530 14.2.34 CASE 4:
1672 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1673 */
1da177e4 1674 status = nfserr_stale_clientid;
7c79f737 1675 } else {
08e8987c
N		 1676 /* check that we have hit one of the cases...*/
1677 status = nfserr_clid_inuse;
1678 }
1da177e4 1679out:
1da177e4
LT		 1680 nfs4_unlock_state();
1681 return status;
1682}
1683
1da177e4
LT		 1684/* OPEN Share state helper functions */
1685static inline struct nfs4_file *
1686alloc_init_file(struct inode *ino)
1687{
1688 struct nfs4_file *fp;
1689 unsigned int hashval = file_hashval(ino);
1690
e60d4398
N		 1691 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1692 if (fp) {
8b671b80 1693 atomic_set(&fp->fi_ref, 1);
1da177e4 1694 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1695 INIT_LIST_HEAD(&fp->fi_stateids);
1696 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1697 spin_lock(&recall_lock);
1da177e4 1698 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1699 spin_unlock(&recall_lock);
1da177e4
LT		 1700 fp->fi_inode = igrab(ino);
1701 fp->fi_id = current_fileid++;
47f9940c 1702 fp->fi_had_conflict = false;
1da177e4
LT		 1703 return fp;
1704 }
1705 return NULL;
1706}
1707
e60d4398 1708static void
e18b890b 1709nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1710{
e60d4398
N		 1711 if (*slab == NULL)
1712 return;
1a1d92c1 1713 kmem_cache_destroy(*slab);
e60d4398 1714 *slab = NULL;
1da177e4
LT		 1715}
1716
e8ff2a84 1717void
1da177e4
LT		 1718nfsd4_free_slabs(void)
1719{
e60d4398
N		 1720 nfsd4_free_slab(&stateowner_slab);
1721 nfsd4_free_slab(&file_slab);
5ac049ac 1722 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1723 nfsd4_free_slab(&deleg_slab);
e60d4398 1724}
1da177e4 1725
e60d4398
N		 1726static int
1727nfsd4_init_slabs(void)
1728{
1729 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1730 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1731 if (stateowner_slab == NULL)
1732 goto out_nomem;
1733 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1734 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1735 if (file_slab == NULL)
1736 goto out_nomem;
5ac049ac 1737 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1738 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1739 if (stateid_slab == NULL)
1740 goto out_nomem;
5b2d21c1 1741 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1742 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1743 if (deleg_slab == NULL)
1744 goto out_nomem;
e60d4398
N		 1745 return 0;
1746out_nomem:
1747 nfsd4_free_slabs();
1748 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1749 return -ENOMEM;
1da177e4
LT		 1750}
1751
1752void
1753nfs4_free_stateowner(struct kref *kref)
1754{
1755 struct nfs4_stateowner *sop =
1756 container_of(kref, struct nfs4_stateowner, so_ref);
1757 kfree(sop->so_owner.data);
1758 kmem_cache_free(stateowner_slab, sop);
1759}
1760
1761static inline struct nfs4_stateowner *
1762alloc_stateowner(struct xdr_netobj *owner)
1763{
1764 struct nfs4_stateowner *sop;
1765
1766 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1767 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1768 memcpy(sop->so_owner.data, owner->data, owner->len);
1769 sop->so_owner.len = owner->len;
1770 kref_init(&sop->so_ref);
1771 return sop;
1772 }
1773 kmem_cache_free(stateowner_slab, sop);
1774 }
1775 return NULL;
1776}
1777
1778static struct nfs4_stateowner *
1779alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1780 struct nfs4_stateowner *sop;
1781 struct nfs4_replay *rp;
1782 unsigned int idhashval;
1783
1784 if (!(sop = alloc_stateowner(&open->op_owner)))
1785 return NULL;
1786 idhashval = ownerid_hashval(current_ownerid);
1787 INIT_LIST_HEAD(&sop->so_idhash);
1788 INIT_LIST_HEAD(&sop->so_strhash);
1789 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1790 INIT_LIST_HEAD(&sop->so_stateids);
1791 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1792 INIT_LIST_HEAD(&sop->so_close_lru);
1793 sop->so_time = 0;
1794 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1795 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1796 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1797 sop->so_is_open_owner = 1;
1798 sop->so_id = current_ownerid++;
1799 sop->so_client = clp;
1800 sop->so_seqid = open->op_seqid;
1801 sop->so_confirmed = 0;
1802 rp = &sop->so_replay;
de1ae286 1803 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1804 rp->rp_buflen = 0;
1805 rp->rp_buf = rp->rp_ibuf;
1806 return sop;
1807}
1808
1da177e4
LT		 1809static inline void
1810init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1811 struct nfs4_stateowner *sop = open->op_stateowner;
1812 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1813
1814 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1815 INIT_LIST_HEAD(&stp->st_perstateowner);
1816 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1817 INIT_LIST_HEAD(&stp->st_perfile);
1818 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1819 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1820 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1821 stp->st_stateowner = sop;
13cd2184 1822 get_nfs4_file(fp);
1da177e4
LT		 1823 stp->st_file = fp;
1824 stp->st_stateid.si_boot = boot_time;
1825 stp->st_stateid.si_stateownerid = sop->so_id;
1826 stp->st_stateid.si_fileid = fp->fi_id;
1827 stp->st_stateid.si_generation = 0;
1828 stp->st_access_bmap = 0;
1829 stp->st_deny_bmap = 0;
1830 __set_bit(open->op_share_access, &stp->st_access_bmap);
1831 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1832 stp->st_openstp = NULL;
1da177e4
LT		 1833}
1834
fd39ca9a 1835static void
1da177e4
LT		 1836move_to_close_lru(struct nfs4_stateowner *sop)
1837{
1838 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1839
358dd55a 1840 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1841 sop->so_time = get_seconds();
1842}
1843
1da177e4 1844static int
599e0a22
BF		 1845same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1846 clientid_t *clid)
1847{
1848 return (sop->so_owner.len == owner->len) &&
1849 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1850 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1851}
1852
1853static struct nfs4_stateowner *
1854find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1855{
1856 struct nfs4_stateowner *so = NULL;
1857
1858 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1859 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1860 return so;
1861 }
1862 return NULL;
1863}
1864
1865/* search file_hashtbl[] for file */
1866static struct nfs4_file *
1867find_file(struct inode *ino)
1868{
1869 unsigned int hashval = file_hashval(ino);
1870 struct nfs4_file *fp;
1871
8b671b80 1872 spin_lock(&recall_lock);
1da177e4 1873 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1874 if (fp->fi_inode == ino) {
1875 get_nfs4_file(fp);
8b671b80 1876 spin_unlock(&recall_lock);
1da177e4 1877 return fp;
13cd2184 1878 }
1da177e4 1879 }
8b671b80 1880 spin_unlock(&recall_lock);
1da177e4
LT		 1881 return NULL;
1882}
1883
8838dc43 1884static inline int access_valid(u32 x)
ba5a6a19 1885{
8838dc43
BF		 1886 if (x < NFS4_SHARE_ACCESS_READ)
1887 return 0;
1888 if (x > NFS4_SHARE_ACCESS_BOTH)
1889 return 0;
1890 return 1;
ba5a6a19
BF		 1891}
1892
8838dc43 1893static inline int deny_valid(u32 x)
ba5a6a19 1894{
8838dc43
BF		 1895 /* Note: unlike access bits, deny bits may be zero. */
1896 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1897}
1da177e4 1898
4f83aa30
BF		 1899/*
1900 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1901 * st_{access,deny}_bmap field of the stateid, in order to track not
1902 * only what share bits are currently in force, but also what
1903 * combinations of share bits previous opens have used. This allows us
1904 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1905 * return an error if the client attempt to downgrade to a combination
1906 * of share bits not explicable by closing some of its previous opens.
1907 *
1908 * XXX: This enforcement is actually incomplete, since we don't keep
1909 * track of access/deny bit combinations; so, e.g., we allow:
1910 *
1911 * OPEN allow read, deny write
1912 * OPEN allow both, deny none
1913 * DOWNGRADE allow read, deny none
1914 *
1915 * which we should reject.
1916 */
fd39ca9a 1917static void
1da177e4
LT		 1918set_access(unsigned int *access, unsigned long bmap) {
1919 int i;
1920
1921 *access = 0;
1922 for (i = 1; i < 4; i++) {
1923 if (test_bit(i, &bmap))
1924 *access |= i;
1925 }
1926}
1927
fd39ca9a 1928static void
1da177e4
LT		 1929set_deny(unsigned int *deny, unsigned long bmap) {
1930 int i;
1931
1932 *deny = 0;
1933 for (i = 0; i < 4; i++) {
1934 if (test_bit(i, &bmap))
1935 *deny |= i ;
1936 }
1937}
1938
1939static int
1940test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1941 unsigned int access, deny;
1942
1943 set_access(&access, stp->st_access_bmap);
1944 set_deny(&deny, stp->st_deny_bmap);
1945 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1946 return 0;
1947 return 1;
1948}
1949
1950/*
1951 * Called to check deny when READ with all zero stateid or
1952 * WRITE with all zero or all one stateid
1953 */
b37ad28b 1954static __be32
1da177e4
LT		 1955nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1956{
1957 struct inode *ino = current_fh->fh_dentry->d_inode;
1958 struct nfs4_file *fp;
1959 struct nfs4_stateid *stp;
b37ad28b 1960 __be32 ret;
1da177e4
LT		 1961
1962 dprintk("NFSD: nfs4_share_conflict\n");
1963
1964 fp = find_file(ino);
13cd2184
N		 1965 if (!fp)
1966 return nfs_ok;
b700949b 1967 ret = nfserr_locked;
1da177e4 1968 /* Search for conflicting share reservations */
13cd2184
N		 1969 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1970 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1971 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1972 goto out;
1da177e4 1973 }
13cd2184
N		 1974 ret = nfs_ok;
1975out:
1976 put_nfs4_file(fp);
1977 return ret;
1da177e4
LT		 1978}
1979
1980static inline void
1981nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1982{
1983 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1984 drop_file_write_access(filp);
1da177e4
LT		 1985 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1986 }
1987}
1988
1989/*
1990 * Recall a delegation
1991 */
1992static int
1993do_recall(void *__dp)
1994{
1995 struct nfs4_delegation *dp = __dp;
1996
47f9940c 1997 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1998 nfsd4_cb_recall(dp);
1999 return 0;
2000}
2001
2002/*
2003 * Spawn a thread to perform a recall on the delegation represented
2004 * by the lease (file_lock)
2005 *
2006 * Called from break_lease() with lock_kernel() held.
2007 * Note: we assume break_lease will only call this *once* for any given
2008 * lease.
2009 */
2010static
2011void nfsd_break_deleg_cb(struct file_lock *fl)
2012{
2013 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
2014 struct task_struct *t;
2015
2016 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2017 if (!dp)
2018 return;
2019
2020 /* We're assuming the state code never drops its reference
2021 * without first removing the lease. Since we're in this lease
2022 * callback (and since the lease code is serialized by the kernel
2023 * lock) we know the server hasn't removed the lease yet, we know
2024 * it's safe to take a reference: */
2025 atomic_inc(&dp->dl_count);
cfdcad4d 2026 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 2027
2028 spin_lock(&recall_lock);
2029 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2030 spin_unlock(&recall_lock);
2031
2032 /* only place dl_time is set. protected by lock_kernel*/
2033 dp->dl_time = get_seconds();
2034
0272e1fd
BF		 2035 /*
2036 * We don't want the locks code to timeout the lease for us;
2037 * we'll remove it ourself if the delegation isn't returned
2038 * in time.
2039 */
2040 fl->fl_break_time = 0;
1da177e4
LT		 2041
2042 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
2043 if (IS_ERR(t)) {
2044 struct nfs4_client *clp = dp->dl_client;
2045
2046 printk(KERN_INFO "NFSD: Callback thread failed for "
2047 "for client (clientid %08x/%08x)\n",
2048 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 2049 put_nfs4_client(dp->dl_client);
1da177e4
LT		 2050 nfs4_put_delegation(dp);
2051 }
2052}
2053
2054/*
2055 * The file_lock is being reapd.
2056 *
2057 * Called by locks_free_lock() with lock_kernel() held.
2058 */
2059static
2060void nfsd_release_deleg_cb(struct file_lock *fl)
2061{
2062 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2063
2064 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2065
2066 if (!(fl->fl_flags & FL_LEASE) || !dp)
2067 return;
2068 dp->dl_flock = NULL;
2069}
2070
2071/*
2072 * Set the delegation file_lock back pointer.
2073 *
a9933cea 2074 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 2075 */
2076static
2077void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2078{
2079 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2080
2081 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2082 if (!dp)
2083 return;
2084 dp->dl_flock = new;
2085}
2086
2087/*
a9933cea 2088 * Called from setlease() with lock_kernel() held
1da177e4
LT		 2089 */
2090static
2091int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2092{
2093 struct nfs4_delegation *onlistd =
2094 (struct nfs4_delegation *)onlist->fl_owner;
2095 struct nfs4_delegation *tryd =
2096 (struct nfs4_delegation *)try->fl_owner;
2097
2098 if (onlist->fl_lmops != try->fl_lmops)
2099 return 0;
2100
2101 return onlistd->dl_client == tryd->dl_client;
2102}
2103
2104
2105static
2106int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2107{
2108 if (arg & F_UNLCK)
2109 return lease_modify(onlist, arg);
2110 else
2111 return -EAGAIN;
2112}
2113
fd39ca9a 2114static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 2115 .fl_break = nfsd_break_deleg_cb,
2116 .fl_release_private = nfsd_release_deleg_cb,
2117 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2118 .fl_mylease = nfsd_same_client_deleg_cb,
2119 .fl_change = nfsd_change_deleg_cb,
2120};
2121
2122
b37ad28b 2123__be32
1da177e4
LT		 2124nfsd4_process_open1(struct nfsd4_open *open)
2125{
1da177e4
LT		 2126 clientid_t *clientid = &open->op_clientid;
2127 struct nfs4_client *clp = NULL;
2128 unsigned int strhashval;
2129 struct nfs4_stateowner *sop = NULL;
2130
1da177e4 2131 if (!check_name(open->op_owner))
0f442aa2 2132 return nfserr_inval;
1da177e4
LT		 2133
2134 if (STALE_CLIENTID(&open->op_clientid))
2135 return nfserr_stale_clientid;
2136
2137 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2138 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 2139 open->op_stateowner = sop;
2140 if (!sop) {
2141 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 2142 clp = find_confirmed_client(clientid);
2143 if (clp == NULL)
0f442aa2
BF		 2144 return nfserr_expired;
2145 goto renew;
1da177e4 2146 }
0f442aa2
BF		 2147 if (!sop->so_confirmed) {
2148 /* Replace unconfirmed owners without checking for replay. */
2149 clp = sop->so_client;
f044ff83 2150 release_openowner(sop);
0f442aa2
BF		 2151 open->op_stateowner = NULL;
2152 goto renew;
2153 }
2154 if (open->op_seqid == sop->so_seqid - 1) {
2155 if (sop->so_replay.rp_buflen)
a90b061c 2156 return nfserr_replay_me;
0f442aa2
BF		 2157 /* The original OPEN failed so spectacularly
2158 * that we don't even have replay data saved!
2159 * Therefore, we have no choice but to continue
2160 * processing this OPEN; presumably, we'll
2161 * fail again for the same reason.
2162 */
2163 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2164 goto renew;
2165 }
2166 if (open->op_seqid != sop->so_seqid)
2167 return nfserr_bad_seqid;
1da177e4 2168renew:
0f442aa2
BF		 2169 if (open->op_stateowner == NULL) {
2170 sop = alloc_init_open_stateowner(strhashval, clp, open);
2171 if (sop == NULL)
2172 return nfserr_resource;
2173 open->op_stateowner = sop;
2174 }
2175 list_del_init(&sop->so_close_lru);
1da177e4 2176 renew_client(sop->so_client);
0f442aa2 2177 return nfs_ok;
1da177e4
LT		 2178}
2179
b37ad28b 2180static inline __be32
4a6e43e6
N		 2181nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2182{
2183 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2184 return nfserr_openmode;
2185 else
2186 return nfs_ok;
2187}
2188
52f4fb43
N		 2189static struct nfs4_delegation *
2190find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2191{
2192 struct nfs4_delegation *dp;
2193
ea1da636 2194 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 2195 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2196 return dp;
2197 }
2198 return NULL;
2199}
2200
b37ad28b 2201static __be32
567d9829
N		 2202nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2203 struct nfs4_delegation **dp)
2204{
2205 int flags;
b37ad28b 2206 __be32 status = nfserr_bad_stateid;
567d9829
N		 2207
2208 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2209 if (*dp == NULL)
c44c5eeb 2210 goto out;
567d9829
N		 2211 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2212 RD_STATE : WR_STATE;
2213 status = nfs4_check_delegmode(*dp, flags);
2214 if (status)
2215 *dp = NULL;
c44c5eeb
N		 2216out:
2217 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2218 return nfs_ok;
2219 if (status)
2220 return status;
2221 open->op_stateowner->so_confirmed = 1;
2222 return nfs_ok;
567d9829
N		 2223}
2224
b37ad28b 2225static __be32
1da177e4
LT		 2226nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2227{
2228 struct nfs4_stateid *local;
b37ad28b 2229 __be32 status = nfserr_share_denied;
1da177e4
LT		 2230 struct nfs4_stateowner *sop = open->op_stateowner;
2231
8beefa24 2232 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2233 /* ignore lock owners */
2234 if (local->st_stateowner->so_is_open_owner == 0)
2235 continue;
2236 /* remember if we have seen this open owner */
2237 if (local->st_stateowner == sop)
2238 *stpp = local;
2239 /* check for conflicting share reservations */
2240 if (!test_share(local, open))
2241 goto out;
2242 }
2243 status = 0;
2244out:
2245 return status;
2246}
2247
5ac049ac
N		 2248static inline struct nfs4_stateid *
2249nfs4_alloc_stateid(void)
2250{
2251 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2252}
2253
b37ad28b 2254static __be32
1da177e4 2255nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 2256 struct nfs4_delegation *dp,
1da177e4
LT		 2257 struct svc_fh *cur_fh, int flags)
2258{
2259 struct nfs4_stateid *stp;
1da177e4 2260
5ac049ac 2261 stp = nfs4_alloc_stateid();
1da177e4
LT		 2262 if (stp == NULL)
2263 return nfserr_resource;
2264
567d9829
N		 2265 if (dp) {
2266 get_file(dp->dl_vfs_file);
2267 stp->st_vfs_file = dp->dl_vfs_file;
2268 } else {
b37ad28b 2269 __be32 status;
567d9829
N		 2270 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2271 &stp->st_vfs_file);
2272 if (status) {
2273 if (status == nfserr_dropit)
2274 status = nfserr_jukebox;
5ac049ac 2275 kmem_cache_free(stateid_slab, stp);
567d9829
N		 2276 return status;
2277 }
1da177e4 2278 }
1da177e4
LT		 2279 *stpp = stp;
2280 return 0;
2281}
2282
b37ad28b 2283static inline __be32
1da177e4
LT		 2284nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2285 struct nfsd4_open *open)
2286{
2287 struct iattr iattr = {
2288 .ia_valid = ATTR_SIZE,
2289 .ia_size = 0,
2290 };
2291 if (!open->op_truncate)
2292 return 0;
2293 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2294 return nfserr_inval;
1da177e4
LT		 2295 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2296}
2297
b37ad28b 2298static __be32
1da177e4
LT		 2299nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2300{
2301 struct file *filp = stp->st_vfs_file;
7eaa36e2 2302 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 2303 unsigned int share_access, new_writer;
b37ad28b 2304 __be32 status;
1da177e4
LT		 2305
2306 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 2307 new_writer = (~share_access) & open->op_share_access
2308 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 2309
6c26d08f 2310 if (new_writer) {
b37ad28b
AV		 2311 int err = get_write_access(inode);
2312 if (err)
2313 return nfserrno(err);
e518f056
BH		 2314 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2315 if (err)
2316 return nfserrno(err);
2317 file_take_write(filp);
6c26d08f 2318 }
1da177e4
LT		 2319 status = nfsd4_truncate(rqstp, cur_fh, open);
2320 if (status) {
6c26d08f
BF		 2321 if (new_writer)
2322 put_write_access(inode);
1da177e4
LT		 2323 return status;
2324 }
2325 /* remember the open */
6c26d08f 2326 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 2327 __set_bit(open->op_share_access, &stp->st_access_bmap);
2328 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 2329
2330 return nfs_ok;
2331}
2332
2333
1da177e4 2334static void
37515177 2335nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 2336{
37515177
N		 2337 open->op_stateowner->so_confirmed = 1;
2338 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 2339}
2340
2341/*
2342 * Attempt to hand out a delegation.
2343 */
2344static void
2345nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2346{
2347 struct nfs4_delegation *dp;
2348 struct nfs4_stateowner *sop = stp->st_stateowner;
2349 struct nfs4_callback *cb = &sop->so_client->cl_callback;
2350 struct file_lock fl, *flp = &fl;
2351 int status, flag = 0;
2352
2353 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2354 open->op_recall = 0;
2355 switch (open->op_claim_type) {
2356 case NFS4_OPEN_CLAIM_PREVIOUS:
2357 if (!atomic_read(&cb->cb_set))
2358 open->op_recall = 1;
2359 flag = open->op_delegate_type;
2360 if (flag == NFS4_OPEN_DELEGATE_NONE)
2361 goto out;
2362 break;
2363 case NFS4_OPEN_CLAIM_NULL:
2364 /* Let's not give out any delegations till everyone's
2365 * had the chance to reclaim theirs.... */
af558e33 2366 if (locks_in_grace())
7b190fec
N		 2367 goto out;
2368 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2369 goto out;
2370 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2371 flag = NFS4_OPEN_DELEGATE_WRITE;
2372 else
2373 flag = NFS4_OPEN_DELEGATE_READ;
2374 break;
2375 default:
2376 goto out;
2377 }
1da177e4
LT		 2378
2379 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2380 if (dp == NULL) {
2381 flag = NFS4_OPEN_DELEGATE_NONE;
2382 goto out;
2383 }
2384 locks_init_lock(&fl);
2385 fl.fl_lmops = &nfsd_lease_mng_ops;
2386 fl.fl_flags = FL_LEASE;
9167f501 2387 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2388 fl.fl_end = OFFSET_MAX;
2389 fl.fl_owner = (fl_owner_t)dp;
2390 fl.fl_file = stp->st_vfs_file;
2391 fl.fl_pid = current->tgid;
2392
a9933cea 2393 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2394 * the lock_manager callbacks fl_mylease and fl_change are used
2395 */
9167f501 2396 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2397 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2398 unhash_delegation(dp);
1da177e4
LT		 2399 flag = NFS4_OPEN_DELEGATE_NONE;
2400 goto out;
2401 }
2402
2403 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2404
2405 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2406 dp->dl_stateid.si_boot,
2407 dp->dl_stateid.si_stateownerid,
2408 dp->dl_stateid.si_fileid,
2409 dp->dl_stateid.si_generation);
2410out:
7b190fec
N		 2411 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2412 && flag == NFS4_OPEN_DELEGATE_NONE
2413 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2414 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2415 open->op_delegate_type = flag;
2416}
2417
2418/*
2419 * called with nfs4_lock_state() held.
2420 */
b37ad28b 2421__be32
1da177e4
LT		 2422nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2423{
2424 struct nfs4_file *fp = NULL;
2425 struct inode *ino = current_fh->fh_dentry->d_inode;
2426 struct nfs4_stateid *stp = NULL;
567d9829 2427 struct nfs4_delegation *dp = NULL;
b37ad28b 2428 __be32 status;
1da177e4
LT		 2429
2430 status = nfserr_inval;
ba5a6a19
BF		 2431 if (!access_valid(open->op_share_access)
2432 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2433 goto out;
2434 /*
2435 * Lookup file; if found, lookup stateid and check open request,
2436 * and check for delegations in the process of being recalled.
2437 * If not found, create the nfs4_file struct
2438 */
2439 fp = find_file(ino);
2440 if (fp) {
2441 if ((status = nfs4_check_open(fp, open, &stp)))
2442 goto out;
c44c5eeb
N		 2443 status = nfs4_check_deleg(fp, open, &dp);
2444 if (status)
2445 goto out;
1da177e4 2446 } else {
c44c5eeb
N		 2447 status = nfserr_bad_stateid;
2448 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2449 goto out;
1da177e4
LT		 2450 status = nfserr_resource;
2451 fp = alloc_init_file(ino);
2452 if (fp == NULL)
2453 goto out;
2454 }
2455
2456 /*
2457 * OPEN the file, or upgrade an existing OPEN.
2458 * If truncate fails, the OPEN fails.
2459 */
2460 if (stp) {
2461 /* Stateid was found, this is an OPEN upgrade */
2462 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2463 if (status)
2464 goto out;
444c2c07 2465 update_stateid(&stp->st_stateid);
1da177e4
LT		 2466 } else {
2467 /* Stateid was not found, this is a new OPEN */
2468 int flags = 0;
9ecb6a08 2469 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2470 flags |= NFSD_MAY_READ;
1da177e4 2471 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2472 flags |= NFSD_MAY_WRITE;
567d9829
N		 2473 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2474 if (status)
1da177e4
LT		 2475 goto out;
2476 init_stateid(stp, fp, open);
2477 status = nfsd4_truncate(rqstp, current_fh, open);
2478 if (status) {
2283963f 2479 release_open_stateid(stp);
1da177e4
LT		 2480 goto out;
2481 }
2482 }
2483 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2484
2485 /*
2486 * Attempt to hand out a delegation. No error return, because the
2487 * OPEN succeeds even if we fail.
2488 */
2489 nfs4_open_delegation(current_fh, open, stp);
2490
2491 status = nfs_ok;
2492
2493 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2494 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2495 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2496out:
13cd2184
N		 2497 if (fp)
2498 put_nfs4_file(fp);
37515177
N		 2499 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2500 nfs4_set_claim_prev(open);
1da177e4
LT		 2501 /*
2502 * To finish the open response, we just need to set the rflags.
2503 */
2504 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2505 if (!open->op_stateowner->so_confirmed)
2506 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2507
2508 return status;
2509}
2510
b37ad28b 2511__be32
b591480b
BF		 2512nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2513 clientid_t *clid)
1da177e4
LT		 2514{
2515 struct nfs4_client *clp;
b37ad28b 2516 __be32 status;
1da177e4
LT		 2517
2518 nfs4_lock_state();
2519 dprintk("process_renew(%08x/%08x): starting\n",
2520 clid->cl_boot, clid->cl_id);
2521 status = nfserr_stale_clientid;
2522 if (STALE_CLIENTID(clid))
2523 goto out;
2524 clp = find_confirmed_client(clid);
2525 status = nfserr_expired;
2526 if (clp == NULL) {
2527 /* We assume the client took too long to RENEW. */
2528 dprintk("nfsd4_renew: clientid not found!\n");
2529 goto out;
2530 }
2531 renew_client(clp);
2532 status = nfserr_cb_path_down;
ea1da636 2533 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 2534 && !atomic_read(&clp->cl_callback.cb_set))
2535 goto out;
2536 status = nfs_ok;
2537out:
2538 nfs4_unlock_state();
2539 return status;
2540}
2541
af558e33
BF		 2542struct lock_manager nfsd4_manager = {
2543};
2544
a76b4319 2545static void
af558e33 2546nfsd4_end_grace(void)
a76b4319
N		 2547{
2548 dprintk("NFSD: end of grace period\n");
c7b9a459 2549 nfsd4_recdir_purge_old();
af558e33 2550 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2551}
2552
fd39ca9a 2553static time_t
1da177e4
LT		 2554nfs4_laundromat(void)
2555{
2556 struct nfs4_client *clp;
2557 struct nfs4_stateowner *sop;
2558 struct nfs4_delegation *dp;
2559 struct list_head *pos, *next, reaplist;
2560 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2561 time_t t, clientid_val = NFSD_LEASE_TIME;
2562 time_t u, test_val = NFSD_LEASE_TIME;
2563
2564 nfs4_lock_state();
2565
2566 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2567 if (locks_in_grace())
2568 nfsd4_end_grace();
1da177e4
LT		 2569 list_for_each_safe(pos, next, &client_lru) {
2570 clp = list_entry(pos, struct nfs4_client, cl_lru);
2571 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2572 t = clp->cl_time - cutoff;
2573 if (clientid_val > t)
2574 clientid_val = t;
2575 break;
2576 }
2577 dprintk("NFSD: purging unused client (clientid %08x)\n",
2578 clp->cl_clientid.cl_id);
c7b9a459 2579 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2580 expire_client(clp);
2581 }
2582 INIT_LIST_HEAD(&reaplist);
2583 spin_lock(&recall_lock);
2584 list_for_each_safe(pos, next, &del_recall_lru) {
2585 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2586 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2587 u = dp->dl_time - cutoff;
2588 if (test_val > u)
2589 test_val = u;
2590 break;
2591 }
2592 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2593 dp, dp->dl_flock);
2594 list_move(&dp->dl_recall_lru, &reaplist);
2595 }
2596 spin_unlock(&recall_lock);
2597 list_for_each_safe(pos, next, &reaplist) {
2598 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2599 list_del_init(&dp->dl_recall_lru);
2600 unhash_delegation(dp);
2601 }
2602 test_val = NFSD_LEASE_TIME;
2603 list_for_each_safe(pos, next, &close_lru) {
2604 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2605 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2606 u = sop->so_time - cutoff;
2607 if (test_val > u)
2608 test_val = u;
2609 break;
2610 }
2611 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2612 sop->so_id);
f044ff83 2613 release_openowner(sop);
1da177e4
LT		 2614 }
2615 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2616 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2617 nfs4_unlock_state();
2618 return clientid_val;
2619}
2620
a254b246
HH		 2621static struct workqueue_struct *laundry_wq;
2622static void laundromat_main(struct work_struct *);
2623static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2624
2625static void
c4028958 2626laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2627{
2628 time_t t;
2629
2630 t = nfs4_laundromat();
2631 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2632 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2633}
2634
fd39ca9a 2635static struct nfs4_stateowner *
f8816512
N		 2636search_close_lru(u32 st_id, int flags)
2637{
1da177e4
LT		 2638 struct nfs4_stateowner *local = NULL;
2639
1da177e4
LT		 2640 if (flags & CLOSE_STATE) {
2641 list_for_each_entry(local, &close_lru, so_close_lru) {
2642 if (local->so_id == st_id)
2643 return local;
2644 }
2645 }
2646 return NULL;
2647}
2648
2649static inline int
2650nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2651{
7eaa36e2 2652 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2653}
2654
2655static int
2656STALE_STATEID(stateid_t *stateid)
2657{
2658 if (stateid->si_boot == boot_time)
2659 return 0;
849823c5 2660 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2661 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2662 stateid->si_generation);
2663 return 1;
2664}
2665
2666static inline int
2667access_permit_read(unsigned long access_bmap)
2668{
2669 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2670 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2671 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2672}
2673
2674static inline int
2675access_permit_write(unsigned long access_bmap)
2676{
2677 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2678 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2679}
2680
2681static
b37ad28b 2682__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2683{
b37ad28b 2684 __be32 status = nfserr_openmode;
1da177e4
LT		 2685
2686 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2687 goto out;
2688 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2689 goto out;
2690 status = nfs_ok;
2691out:
2692 return status;
2693}
2694
b37ad28b 2695static inline __be32
1da177e4
LT		 2696check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2697{
203a8c8e 2698 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2699 return nfs_ok;
af558e33 2700 else if (locks_in_grace()) {
1da177e4
LT		 2701 /* Answer in remaining cases depends on existance of
2702 * conflicting state; so we must wait out the grace period. */
2703 return nfserr_grace;
2704 } else if (flags & WR_STATE)
2705 return nfs4_share_conflict(current_fh,
2706 NFS4_SHARE_DENY_WRITE);
2707 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2708 return nfs4_share_conflict(current_fh,
2709 NFS4_SHARE_DENY_READ);
2710}
2711
2712/*
2713 * Allow READ/WRITE during grace period on recovered state only for files
2714 * that are not able to provide mandatory locking.
2715 */
2716static inline int
18f82731 2717grace_disallows_io(struct inode *inode)
1da177e4 2718{
203a8c8e 2719 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2720}
2721
0836f587
BF		 2722static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2723{
2724 /* If the client sends us a stateid from the future, it's buggy: */
2725 if (in->si_generation > ref->si_generation)
2726 return nfserr_bad_stateid;
2727 /*
2728 * The following, however, can happen. For example, if the
2729 * client sends an open and some IO at the same time, the open
2730 * may bump si_generation while the IO is still in flight.
2731 * Thanks to hard links and renames, the client never knows what
2732 * file an open will affect. So it could avoid that situation
2733 * only by serializing all opens and IO from the same open
2734 * owner. To recover from the old_stateid error, the client
2735 * will just have to retry the IO:
2736 */
2737 if (in->si_generation < ref->si_generation)
2738 return nfserr_old_stateid;
2739 return nfs_ok;
2740}
2741
3e633079
BF		 2742static int is_delegation_stateid(stateid_t *stateid)
2743{
2744 return stateid->si_fileid == 0;
2745}
2746
1da177e4
LT		 2747/*
2748* Checks for stateid operations
2749*/
b37ad28b 2750__be32
1da177e4
LT		 2751nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2752{
2753 struct nfs4_stateid *stp = NULL;
2754 struct nfs4_delegation *dp = NULL;
1da177e4 2755 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2756 __be32 status;
1da177e4 2757
1da177e4
LT		 2758 if (filpp)
2759 *filpp = NULL;
2760
18f82731 2761 if (grace_disallows_io(ino))
1da177e4
LT		 2762 return nfserr_grace;
2763
2764 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2765 return check_special_stateids(current_fh, stateid, flags);
2766
1da177e4
LT		 2767 status = nfserr_stale_stateid;
2768 if (STALE_STATEID(stateid))
2769 goto out;
2770
1da177e4 2771 status = nfserr_bad_stateid;
3e633079 2772 if (is_delegation_stateid(stateid)) {
a4455be0 2773 dp = find_delegation_stateid(ino, stateid);
819a8f53 2774 if (!dp)
1da177e4 2775 goto out;
fd03b099 2776 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2777 if (status)
2778 goto out;
dc9bf700
BF		 2779 status = nfs4_check_delegmode(dp, flags);
2780 if (status)
2781 goto out;
2782 renew_client(dp->dl_client);
dc9bf700
BF		 2783 if (filpp)
2784 *filpp = dp->dl_vfs_file;
1da177e4 2785 } else { /* open or lock stateid */
a4455be0 2786 stp = find_stateid(stateid, flags);
819a8f53 2787 if (!stp)
1da177e4 2788 goto out;
6150ef0d 2789 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2790 goto out;
2791 if (!stp->st_stateowner->so_confirmed)
2792 goto out;
fd03b099 2793 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2794 if (status)
2795 goto out;
a4455be0
BF		 2796 status = nfs4_check_openmode(stp, flags);
2797 if (status)
1da177e4
LT		 2798 goto out;
2799 renew_client(stp->st_stateowner->so_client);
2800 if (filpp)
2801 *filpp = stp->st_vfs_file;
1da177e4
LT		 2802 }
2803 status = nfs_ok;
2804out:
2805 return status;
2806}
2807
4c4cd222
N		 2808static inline int
2809setlkflg (int type)
2810{
2811 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2812 RD_STATE : WR_STATE;
2813}
1da177e4
LT		 2814
2815/*
2816 * Checks for sequence id mutating operations.
2817 */
b37ad28b 2818static __be32
4c4cd222 2819nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2820{
1da177e4
LT		 2821 struct nfs4_stateid *stp;
2822 struct nfs4_stateowner *sop;
0836f587 2823 __be32 status;
1da177e4
LT		 2824
2825 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2826 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2827 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2828 stateid->si_generation);
3a4f98bb 2829
1da177e4
LT		 2830 *stpp = NULL;
2831 *sopp = NULL;
2832
1da177e4 2833 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2834 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2835 return nfserr_bad_stateid;
1da177e4
LT		 2836 }
2837
1da177e4 2838 if (STALE_STATEID(stateid))
3a4f98bb 2839 return nfserr_stale_stateid;
1da177e4
LT		 2840 /*
2841 * We return BAD_STATEID if filehandle doesn't match stateid,
2842 * the confirmed flag is incorrecly set, or the generation
2843 * number is incorrect.
1da177e4 2844 */
f8816512
N		 2845 stp = find_stateid(stateid, flags);
2846 if (stp == NULL) {
2847 /*
2848 * Also, we should make sure this isn't just the result of
2849 * a replayed close:
2850 */
2851 sop = search_close_lru(stateid->si_stateownerid, flags);
2852 if (sop == NULL)
2853 return nfserr_bad_stateid;
2854 *sopp = sop;
2855 goto check_replay;
2856 }
1da177e4 2857
39325bd0
BF		 2858 *stpp = stp;
2859 *sopp = sop = stp->st_stateowner;
2860
4c4cd222 2861 if (lock) {
4c4cd222 2862 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2863 struct nfs4_client *clp = sop->so_client;
4c4cd222 2864 int lkflg = 0;
b37ad28b 2865 __be32 status;
4c4cd222
N		 2866
2867 lkflg = setlkflg(lock->lk_type);
2868
2869 if (lock->lk_is_new) {
599e0a22
BF		 2870 if (!sop->so_is_open_owner)
2871 return nfserr_bad_stateid;
2872 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2873 return nfserr_bad_stateid;
599e0a22
BF		 2874 /* stp is the open stateid */
2875 status = nfs4_check_openmode(stp, lkflg);
2876 if (status)
2877 return status;
2878 } else {
2879 /* stp is the lock stateid */
2880 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2881 if (status)
2882 return status;
4c4cd222 2883 }
1da177e4
LT		 2884 }
2885
f3362737 2886 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2887 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2888 return nfserr_bad_stateid;
1da177e4
LT		 2889 }
2890
1da177e4
LT		 2891 /*
2892 * We now validate the seqid and stateid generation numbers.
2893 * For the moment, we ignore the possibility of
2894 * generation number wraparound.
2895 */
bd9aac52 2896 if (seqid != sop->so_seqid)
1da177e4
LT		 2897 goto check_replay;
2898
3a4f98bb 2899 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2900 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2901 " unconfirmed stateowner!\n");
2902 return nfserr_bad_stateid;
1da177e4 2903 }
3a4f98bb 2904 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2905 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2906 " confirmed yet!\n");
2907 return nfserr_bad_stateid;
1da177e4 2908 }
0836f587
BF		 2909 status = check_stateid_generation(stateid, &stp->st_stateid);
2910 if (status)
2911 return status;
52fd004e 2912 renew_client(sop->so_client);
3a4f98bb 2913 return nfs_ok;
1da177e4 2914
1da177e4 2915check_replay:
bd9aac52 2916 if (seqid == sop->so_seqid - 1) {
849823c5 2917 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2918 /* indicate replay to calling function */
a90b061c 2919 return nfserr_replay_me;
1da177e4 2920 }
2fdada03 2921 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2922 sop->so_seqid, seqid);
2923 *sopp = NULL;
2924 return nfserr_bad_seqid;
1da177e4
LT		 2925}
2926
b37ad28b 2927__be32
ca364317 2928nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2929 struct nfsd4_open_confirm *oc)
1da177e4 2930{
b37ad28b 2931 __be32 status;
1da177e4
LT		 2932 struct nfs4_stateowner *sop;
2933 struct nfs4_stateid *stp;
2934
2935 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2936 (int)cstate->current_fh.fh_dentry->d_name.len,
2937 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2938
ca364317 2939 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2940 if (status)
2941 return status;
1da177e4
LT		 2942
2943 nfs4_lock_state();
2944
ca364317
BF		 2945 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2946 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2947 CONFIRM | OPEN_STATE,
1da177e4
LT		 2948 &oc->oc_stateowner, &stp, NULL)))
2949 goto out;
2950
2951 sop = oc->oc_stateowner;
2952 sop->so_confirmed = 1;
2953 update_stateid(&stp->st_stateid);
2954 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2955 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2956 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2957 stp->st_stateid.si_boot,
2958 stp->st_stateid.si_stateownerid,
2959 stp->st_stateid.si_fileid,
2960 stp->st_stateid.si_generation);
c7b9a459
N		 2961
2962 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2963out:
f2327d9a 2964 if (oc->oc_stateowner) {
1da177e4 2965 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2966 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2967 }
1da177e4
LT		 2968 nfs4_unlock_state();
2969 return status;
2970}
2971
2972
2973/*
2974 * unset all bits in union bitmap (bmap) that
2975 * do not exist in share (from successful OPEN_DOWNGRADE)
2976 */
2977static void
2978reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2979{
2980 int i;
2981 for (i = 1; i < 4; i++) {
2982 if ((i & access) != i)
2983 __clear_bit(i, bmap);
2984 }
2985}
2986
2987static void
2988reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2989{
2990 int i;
2991 for (i = 0; i < 4; i++) {
2992 if ((i & deny) != i)
2993 __clear_bit(i, bmap);
2994 }
2995}
2996
b37ad28b 2997__be32
ca364317
BF		 2998nfsd4_open_downgrade(struct svc_rqst *rqstp,
2999 struct nfsd4_compound_state *cstate,
a4f1706a 3000 struct nfsd4_open_downgrade *od)
1da177e4 3001{
b37ad28b 3002 __be32 status;
1da177e4
LT		 3003 struct nfs4_stateid *stp;
3004 unsigned int share_access;
3005
3006 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3007 (int)cstate->current_fh.fh_dentry->d_name.len,
3008 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3009
ba5a6a19
BF		 3010 if (!access_valid(od->od_share_access)
3011 || !deny_valid(od->od_share_deny))
1da177e4
LT		 3012 return nfserr_inval;
3013
3014 nfs4_lock_state();
ca364317
BF		 3015 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
3016 od->od_seqid,
1da177e4 3017 &od->od_stateid,
f3362737 3018 OPEN_STATE,
1da177e4
LT		 3019 &od->od_stateowner, &stp, NULL)))
3020 goto out;
3021
3022 status = nfserr_inval;
3023 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3024 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3025 stp->st_access_bmap, od->od_share_access);
3026 goto out;
3027 }
3028 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3029 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3030 stp->st_deny_bmap, od->od_share_deny);
3031 goto out;
3032 }
3033 set_access(&share_access, stp->st_access_bmap);
3034 nfs4_file_downgrade(stp->st_vfs_file,
3035 share_access & ~od->od_share_access);
3036
3037 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3038 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3039
3040 update_stateid(&stp->st_stateid);
3041 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3042 status = nfs_ok;
3043out:
f2327d9a 3044 if (od->od_stateowner) {
1da177e4 3045 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 3046 cstate->replay_owner = od->od_stateowner;
f2327d9a 3047 }
1da177e4
LT		 3048 nfs4_unlock_state();
3049 return status;
3050}
3051
3052/*
3053 * nfs4_unlock_state() called after encode
3054 */
b37ad28b 3055__be32
ca364317 3056nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3057 struct nfsd4_close *close)
1da177e4 3058{
b37ad28b 3059 __be32 status;
1da177e4
LT		 3060 struct nfs4_stateid *stp;
3061
3062 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3063 (int)cstate->current_fh.fh_dentry->d_name.len,
3064 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3065
3066 nfs4_lock_state();
3067 /* check close_lru for replay */
ca364317
BF		 3068 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
3069 close->cl_seqid,
1da177e4 3070 &close->cl_stateid,
f3362737 3071 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 3072 &close->cl_stateowner, &stp, NULL)))
3073 goto out;
1da177e4
LT		 3074 status = nfs_ok;
3075 update_stateid(&stp->st_stateid);
3076 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3077
04ef5954 3078 /* release_stateid() calls nfsd_close() if needed */
2283963f 3079 release_open_stateid(stp);
04ef5954
BF		 3080
3081 /* place unused nfs4_stateowners on so_close_lru list to be
3082 * released by the laundromat service after the lease period
3083 * to enable us to handle CLOSE replay
3084 */
3085 if (list_empty(&close->cl_stateowner->so_stateids))
3086 move_to_close_lru(close->cl_stateowner);
1da177e4 3087out:
f2327d9a 3088 if (close->cl_stateowner) {
1da177e4 3089 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 3090 cstate->replay_owner = close->cl_stateowner;
f2327d9a 3091 }
1da177e4
LT		 3092 nfs4_unlock_state();
3093 return status;
3094}
3095
b37ad28b 3096__be32
ca364317
BF		 3097nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3098 struct nfsd4_delegreturn *dr)
1da177e4 3099{
203a8c8e
BF		 3100 struct nfs4_delegation *dp;
3101 stateid_t *stateid = &dr->dr_stateid;
3102 struct inode *inode;
b37ad28b 3103 __be32 status;
1da177e4 3104
ca364317 3105 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3106 return status;
3107 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3108
3109 nfs4_lock_state();
203a8c8e
BF		 3110 status = nfserr_bad_stateid;
3111 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3112 goto out;
3113 status = nfserr_stale_stateid;
3114 if (STALE_STATEID(stateid))
3115 goto out;
7e0f7cf5 3116 status = nfserr_bad_stateid;
203a8c8e
BF		 3117 if (!is_delegation_stateid(stateid))
3118 goto out;
203a8c8e
BF		 3119 dp = find_delegation_stateid(inode, stateid);
3120 if (!dp)
3121 goto out;
3122 status = check_stateid_generation(stateid, &dp->dl_stateid);
3123 if (status)
3124 goto out;
3125 renew_client(dp->dl_client);
3126
3127 unhash_delegation(dp);
1da177e4 3128out:
203a8c8e
BF		 3129 nfs4_unlock_state();
3130
1da177e4
LT		 3131 return status;
3132}
3133
3134
3135/*
3136 * Lock owner state (byte-range locks)
3137 */
3138#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3139#define LOCK_HASH_BITS 8
3140#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3141#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3142
87df4de8
BH		 3143static inline u64
3144end_offset(u64 start, u64 len)
3145{
3146 u64 end;
3147
3148 end = start + len;
3149 return end >= start ? end: NFS4_MAX_UINT64;
3150}
3151
3152/* last octet in a range */
3153static inline u64
3154last_byte_offset(u64 start, u64 len)
3155{
3156 u64 end;
3157
3158 BUG_ON(!len);
3159 end = start + len;
3160 return end > start ? end - 1: NFS4_MAX_UINT64;
3161}
3162
1da177e4
LT		 3163#define lockownerid_hashval(id) \
3164 ((id) & LOCK_HASH_MASK)
3165
3166static inline unsigned int
3167lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3168 struct xdr_netobj *ownername)
3169{
3170 return (file_hashval(inode) + cl_id
3171 + opaque_hashval(ownername->data, ownername->len))
3172 & LOCK_HASH_MASK;
3173}
3174
3175static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3176static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3177static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3178
fd39ca9a 3179static struct nfs4_stateid *
1da177e4
LT		 3180find_stateid(stateid_t *stid, int flags)
3181{
9346eff0 3182 struct nfs4_stateid *local;
1da177e4
LT		 3183 u32 st_id = stid->si_stateownerid;
3184 u32 f_id = stid->si_fileid;
3185 unsigned int hashval;
3186
3187 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 3188 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3189 hashval = stateid_hashval(st_id, f_id);
3190 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3191 if ((local->st_stateid.si_stateownerid == st_id) &&
3192 (local->st_stateid.si_fileid == f_id))
3193 return local;
3194 }
3195 }
9346eff0
KK		 3196
3197 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3198 hashval = stateid_hashval(st_id, f_id);
3199 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3200 if ((local->st_stateid.si_stateownerid == st_id) &&
3201 (local->st_stateid.si_fileid == f_id))
3202 return local;
3203 }
849823c5 3204 }
1da177e4
LT		 3205 return NULL;
3206}
3207
3208static struct nfs4_delegation *
3209find_delegation_stateid(struct inode *ino, stateid_t *stid)
3210{
13cd2184
N		 3211 struct nfs4_file *fp;
3212 struct nfs4_delegation *dl;
1da177e4
LT		 3213
3214 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
3215 stid->si_boot, stid->si_stateownerid,
3216 stid->si_fileid, stid->si_generation);
3217
1da177e4 3218 fp = find_file(ino);
13cd2184
N		 3219 if (!fp)
3220 return NULL;
3221 dl = find_delegation_file(fp, stid);
3222 put_nfs4_file(fp);
3223 return dl;
1da177e4
LT		 3224}
3225
3226/*
3227 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3228 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3229 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3230 * locking, this prevents us from being completely protocol-compliant. The
3231 * real solution to this problem is to start using unsigned file offsets in
3232 * the VFS, but this is a very deep change!
3233 */
3234static inline void
3235nfs4_transform_lock_offset(struct file_lock *lock)
3236{
3237 if (lock->fl_start < 0)
3238 lock->fl_start = OFFSET_MAX;
3239 if (lock->fl_end < 0)
3240 lock->fl_end = OFFSET_MAX;
3241}
3242
d5b9026a
N		 3243/* Hack!: For now, we're defining this just so we can use a pointer to it
3244 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 3245static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3246};
1da177e4
LT		 3247
3248static inline void
3249nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3250{
d5b9026a
N		 3251 struct nfs4_stateowner *sop;
3252 unsigned int hval;
1da177e4 3253
d5b9026a
N		 3254 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3255 sop = (struct nfs4_stateowner *) fl->fl_owner;
3256 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 3257 kref_get(&sop->so_ref);
3258 deny->ld_sop = sop;
3259 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 3260 } else {
3261 deny->ld_sop = NULL;
3262 deny->ld_clientid.cl_boot = 0;
3263 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3264 }
3265 deny->ld_start = fl->fl_start;
87df4de8
BH		 3266 deny->ld_length = NFS4_MAX_UINT64;
3267 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3268 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3269 deny->ld_type = NFS4_READ_LT;
3270 if (fl->fl_type != F_RDLCK)
3271 deny->ld_type = NFS4_WRITE_LT;
3272}
3273
1da177e4
LT		 3274static struct nfs4_stateowner *
3275find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3276 struct xdr_netobj *owner)
3277{
3278 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3279 struct nfs4_stateowner *op;
3280
3281 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 3282 if (same_owner_str(op, owner, clid))
1da177e4
LT		 3283 return op;
3284 }
3285 return NULL;
3286}
3287
3288/*
3289 * Alloc a lock owner structure.
3290 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3291 * occured.
3292 *
3293 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 3294 */
3295
3296static struct nfs4_stateowner *
3297alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3298 struct nfs4_stateowner *sop;
3299 struct nfs4_replay *rp;
3300 unsigned int idhashval;
3301
3302 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3303 return NULL;
3304 idhashval = lockownerid_hashval(current_ownerid);
3305 INIT_LIST_HEAD(&sop->so_idhash);
3306 INIT_LIST_HEAD(&sop->so_strhash);
3307 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 3308 INIT_LIST_HEAD(&sop->so_stateids);
3309 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 3310 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3311 sop->so_time = 0;
3312 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3313 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 3314 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 3315 sop->so_is_open_owner = 0;
3316 sop->so_id = current_ownerid++;
3317 sop->so_client = clp;
b59e3c0e
NB		 3318 /* It is the openowner seqid that will be incremented in encode in the
3319 * case of new lockowners; so increment the lock seqid manually: */
3320 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 3321 sop->so_confirmed = 1;
3322 rp = &sop->so_replay;
de1ae286 3323 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 3324 rp->rp_buflen = 0;
3325 rp->rp_buf = rp->rp_ibuf;
3326 return sop;
3327}
3328
fd39ca9a 3329static struct nfs4_stateid *
1da177e4
LT		 3330alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3331{
3332 struct nfs4_stateid *stp;
3333 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3334
5ac049ac
N		 3335 stp = nfs4_alloc_stateid();
3336 if (stp == NULL)
1da177e4
LT		 3337 goto out;
3338 INIT_LIST_HEAD(&stp->st_hash);
3339 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 3340 INIT_LIST_HEAD(&stp->st_perstateowner);
3341 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 3342 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 3343 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 3344 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 3345 stp->st_stateowner = sop;
13cd2184 3346 get_nfs4_file(fp);
1da177e4
LT		 3347 stp->st_file = fp;
3348 stp->st_stateid.si_boot = boot_time;
3349 stp->st_stateid.si_stateownerid = sop->so_id;
3350 stp->st_stateid.si_fileid = fp->fi_id;
3351 stp->st_stateid.si_generation = 0;
3352 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3353 stp->st_access_bmap = open_stp->st_access_bmap;
3354 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3355 stp->st_openstp = open_stp;
1da177e4
LT		 3356
3357out:
3358 return stp;
3359}
3360
fd39ca9a 3361static int
1da177e4
LT		 3362check_lock_length(u64 offset, u64 length)
3363{
87df4de8 3364 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3365 LOFF_OVERFLOW(offset, length)));
3366}
3367
3368/*
3369 * LOCK operation
3370 */
b37ad28b 3371__be32
ca364317 3372nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3373 struct nfsd4_lock *lock)
1da177e4 3374{
3e9e3dbe 3375 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3376 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3377 struct nfs4_stateid *lock_stp;
3378 struct file *filp;
3379 struct file_lock file_lock;
8dc7c311 3380 struct file_lock conflock;
b37ad28b 3381 __be32 status = 0;
1da177e4 3382 unsigned int strhashval;
150b3934 3383 unsigned int cmd;
b8dd7b9a 3384 int err;
1da177e4
LT		 3385
3386 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3387 (long long) lock->lk_offset,
3388 (long long) lock->lk_length);
3389
1da177e4
LT		 3390 if (check_lock_length(lock->lk_offset, lock->lk_length))
3391 return nfserr_inval;
3392
ca364317 3393 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3394 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3395 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3396 return status;
3397 }
3398
1da177e4
LT		 3399 nfs4_lock_state();
3400
3401 if (lock->lk_is_new) {
893f8770
N		 3402 /*
3403 * Client indicates that this is a new lockowner.
3404 * Use open owner and open stateid to create lock owner and
3405 * lock stateid.
3406 */
1da177e4
LT		 3407 struct nfs4_stateid *open_stp = NULL;
3408 struct nfs4_file *fp;
3409
3410 status = nfserr_stale_clientid;
849823c5 3411 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3412 goto out;
1da177e4 3413
1da177e4 3414 /* validate and update open stateid and open seqid */
ca364317 3415 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3416 lock->lk_new_open_seqid,
3417 &lock->lk_new_open_stateid,
f3362737 3418 OPEN_STATE,
3a65588a 3419 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3420 lock);
37515177 3421 if (status)
1da177e4 3422 goto out;
3a65588a 3423 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3424 /* create lockowner and lock stateid */
3425 fp = open_stp->st_file;
3426 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3427 open_sop->so_client->cl_clientid.cl_id,
3428 &lock->v.new.owner);
3e9e3dbe
N		 3429 /* XXX: Do we need to check for duplicate stateowners on
3430 * the same file, or should they just be allowed (and
3431 * create new stateids)? */
1da177e4 3432 status = nfserr_resource;
b59e3c0e
NB		 3433 lock_sop = alloc_init_lock_stateowner(strhashval,
3434 open_sop->so_client, open_stp, lock);
3435 if (lock_sop == NULL)
1da177e4 3436 goto out;
b59e3c0e 3437 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3438 if (lock_stp == NULL)
1da177e4 3439 goto out;
1da177e4
LT		 3440 } else {
3441 /* lock (lock owner + lock stateid) already exists */
ca364317 3442 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3443 lock->lk_old_lock_seqid,
3444 &lock->lk_old_lock_stateid,
f3362737 3445 LOCK_STATE,
3a65588a 3446 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3447 if (status)
3448 goto out;
3a65588a 3449 lock_sop = lock->lk_replay_owner;
1da177e4 3450 }
3a65588a 3451 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3452 filp = lock_stp->st_vfs_file;
3453
0dd395dc 3454 status = nfserr_grace;
af558e33 3455 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3456 goto out;
3457 status = nfserr_no_grace;
af558e33 3458 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3459 goto out;
3460
1da177e4
LT		 3461 locks_init_lock(&file_lock);
3462 switch (lock->lk_type) {
3463 case NFS4_READ_LT:
3464 case NFS4_READW_LT:
3465 file_lock.fl_type = F_RDLCK;
150b3934 3466 cmd = F_SETLK;
1da177e4
LT		 3467 break;
3468 case NFS4_WRITE_LT:
3469 case NFS4_WRITEW_LT:
3470 file_lock.fl_type = F_WRLCK;
150b3934 3471 cmd = F_SETLK;
1da177e4
LT		 3472 break;
3473 default:
3474 status = nfserr_inval;
3475 goto out;
3476 }
b59e3c0e 3477 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3478 file_lock.fl_pid = current->tgid;
3479 file_lock.fl_file = filp;
3480 file_lock.fl_flags = FL_POSIX;
d5b9026a 3481 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3482
3483 file_lock.fl_start = lock->lk_offset;
87df4de8 3484 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3485 nfs4_transform_lock_offset(&file_lock);
3486
3487 /*
3488 * Try to lock the file in the VFS.
3489 * Note: locks.c uses the BKL to protect the inode's lock list.
3490 */
3491
fd85b817 3492 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3493 switch (-err) {
1da177e4
LT		 3494 case 0: /* success! */
3495 update_stateid(&lock_stp->st_stateid);
3496 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3497 sizeof(stateid_t));
b8dd7b9a 3498 status = 0;
eb76b3fd
AA		 3499 break;
3500 case (EAGAIN): /* conflock holds conflicting lock */
3501 status = nfserr_denied;
3502 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3503 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3504 break;
1da177e4
LT		 3505 case (EDEADLK):
3506 status = nfserr_deadlock;
eb76b3fd 3507 break;
1da177e4 3508 default:
fd85b817 3509 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3510 status = nfserr_resource;
3511 break;
1da177e4 3512 }
1da177e4 3513out:
8a280510 3514 if (status && lock->lk_is_new && lock_sop)
f044ff83 3515 release_lockowner(lock_sop);
3a65588a
BF		 3516 if (lock->lk_replay_owner) {
3517 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3518 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3519 }
1da177e4
LT		 3520 nfs4_unlock_state();
3521 return status;
3522}
3523
55ef1274
BF		 3524/*
3525 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3526 * so we do a temporary open here just to get an open file to pass to
3527 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3528 * inode operation.)
3529 */
3530static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3531{
3532 struct file *file;
3533 int err;
3534
3535 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3536 if (err)
3537 return err;
3538 err = vfs_test_lock(file, lock);
3539 nfsd_close(file);
3540 return err;
3541}
3542
1da177e4
LT		 3543/*
3544 * LOCKT operation
3545 */
b37ad28b 3546__be32
ca364317
BF		 3547nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3548 struct nfsd4_lockt *lockt)
1da177e4
LT		 3549{
3550 struct inode *inode;
1da177e4 3551 struct file_lock file_lock;
fd85b817 3552 int error;
b37ad28b 3553 __be32 status;
1da177e4 3554
af558e33 3555 if (locks_in_grace())
1da177e4
LT		 3556 return nfserr_grace;
3557
3558 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3559 return nfserr_inval;
3560
3561 lockt->lt_stateowner = NULL;
3562 nfs4_lock_state();
3563
3564 status = nfserr_stale_clientid;
849823c5 3565 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3566 goto out;
1da177e4 3567
ca364317 3568 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3569 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3570 if (status == nfserr_symlink)
3571 status = nfserr_inval;
3572 goto out;
3573 }
3574
ca364317 3575 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3576 locks_init_lock(&file_lock);
3577 switch (lockt->lt_type) {
3578 case NFS4_READ_LT:
3579 case NFS4_READW_LT:
3580 file_lock.fl_type = F_RDLCK;
3581 break;
3582 case NFS4_WRITE_LT:
3583 case NFS4_WRITEW_LT:
3584 file_lock.fl_type = F_WRLCK;
3585 break;
3586 default:
2fdada03 3587 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3588 status = nfserr_inval;
3589 goto out;
3590 }
3591
3592 lockt->lt_stateowner = find_lockstateowner_str(inode,
3593 &lockt->lt_clientid, &lockt->lt_owner);
3594 if (lockt->lt_stateowner)
3595 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3596 file_lock.fl_pid = current->tgid;
3597 file_lock.fl_flags = FL_POSIX;
3598
3599 file_lock.fl_start = lockt->lt_offset;
87df4de8 3600 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3601
3602 nfs4_transform_lock_offset(&file_lock);
3603
1da177e4 3604 status = nfs_ok;
55ef1274 3605 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3606 if (error) {
3607 status = nfserrno(error);
3608 goto out;
3609 }
9d6a8c5c 3610 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3611 status = nfserr_denied;
9d6a8c5c 3612 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3613 }
3614out:
3615 nfs4_unlock_state();
3616 return status;
3617}
3618
b37ad28b 3619__be32
ca364317 3620nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3621 struct nfsd4_locku *locku)
1da177e4
LT		 3622{
3623 struct nfs4_stateid *stp;
3624 struct file *filp = NULL;
3625 struct file_lock file_lock;
b37ad28b 3626 __be32 status;
b8dd7b9a 3627 int err;
1da177e4
LT		 3628
3629 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3630 (long long) locku->lu_offset,
3631 (long long) locku->lu_length);
3632
3633 if (check_lock_length(locku->lu_offset, locku->lu_length))
3634 return nfserr_inval;
3635
3636 nfs4_lock_state();
3637
ca364317 3638 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3639 locku->lu_seqid,
3640 &locku->lu_stateid,
f3362737 3641 LOCK_STATE,
1da177e4
LT		 3642 &locku->lu_stateowner, &stp, NULL)))
3643 goto out;
3644
3645 filp = stp->st_vfs_file;
3646 BUG_ON(!filp);
3647 locks_init_lock(&file_lock);
3648 file_lock.fl_type = F_UNLCK;
3649 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3650 file_lock.fl_pid = current->tgid;
3651 file_lock.fl_file = filp;
3652 file_lock.fl_flags = FL_POSIX;
d5b9026a 3653 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3654 file_lock.fl_start = locku->lu_offset;
3655
87df4de8 3656 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3657 nfs4_transform_lock_offset(&file_lock);
3658
3659 /*
3660 * Try to unlock the file in the VFS.
3661 */
fd85b817 3662 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3663 if (err) {
fd85b817 3664 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3665 goto out_nfserr;
3666 }
3667 /*
3668 * OK, unlock succeeded; the only thing left to do is update the stateid.
3669 */
3670 update_stateid(&stp->st_stateid);
3671 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3672
3673out:
f2327d9a 3674 if (locku->lu_stateowner) {
1da177e4 3675 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3676 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3677 }
1da177e4
LT		 3678 nfs4_unlock_state();
3679 return status;
3680
3681out_nfserr:
b8dd7b9a 3682 status = nfserrno(err);
1da177e4
LT		 3683 goto out;
3684}
3685
3686/*
3687 * returns
3688 * 1: locks held by lockowner
3689 * 0: no locks held by lockowner
3690 */
3691static int
3692check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3693{
3694 struct file_lock **flpp;
7eaa36e2 3695 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3696 int status = 0;
3697
3698 lock_kernel();
3699 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3700 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3701 status = 1;
3702 goto out;
796dadfd 3703 }
1da177e4
LT		 3704 }
3705out:
3706 unlock_kernel();
3707 return status;
3708}
3709
b37ad28b 3710__be32
b591480b
BF		 3711nfsd4_release_lockowner(struct svc_rqst *rqstp,
3712 struct nfsd4_compound_state *cstate,
3713 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3714{
3715 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3716 struct nfs4_stateowner *sop;
3717 struct nfs4_stateid *stp;
1da177e4 3718 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3719 struct list_head matches;
3720 int i;
b37ad28b 3721 __be32 status;
1da177e4
LT		 3722
3723 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3724 clid->cl_boot, clid->cl_id);
3725
3726 /* XXX check for lease expiration */
3727
3728 status = nfserr_stale_clientid;
849823c5 3729 if (STALE_CLIENTID(clid))
1da177e4 3730 return status;
1da177e4
LT		 3731
3732 nfs4_lock_state();
3733
3e9e3dbe
N		 3734 status = nfserr_locks_held;
3735 /* XXX: we're doing a linear search through all the lockowners.
3736 * Yipes! For now we'll just hope clients aren't really using
3737 * release_lockowner much, but eventually we have to fix these
3738 * data structures. */
3739 INIT_LIST_HEAD(&matches);
3740 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3741 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3742 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3743 continue;
3744 list_for_each_entry(stp, &sop->so_stateids,
3745 st_perstateowner) {
3746 if (check_for_locks(stp->st_vfs_file, sop))
3747 goto out;
3748 /* Note: so_perclient unused for lockowners,
3749 * so it's OK to fool with here. */
3750 list_add(&sop->so_perclient, &matches);
3751 }
1da177e4 3752 }
3e9e3dbe
N		 3753 }
3754 /* Clients probably won't expect us to return with some (but not all)
3755 * of the lockowner state released; so don't release any until all
3756 * have been checked. */
3757 status = nfs_ok;
0fa822e4
N		 3758 while (!list_empty(&matches)) {
3759 sop = list_entry(matches.next, struct nfs4_stateowner,
3760 so_perclient);
3761 /* unhash_stateowner deletes so_perclient only
3762 * for openowners. */
3763 list_del(&sop->so_perclient);
f044ff83 3764 release_lockowner(sop);
1da177e4
LT		 3765 }
3766out:
3767 nfs4_unlock_state();
3768 return status;
3769}
3770
3771static inline struct nfs4_client_reclaim *
a55370a3 3772alloc_reclaim(void)
1da177e4 3773{
a55370a3 3774 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3775}
3776
c7b9a459 3777int
a1bcecd2 3778nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3779{
3780 unsigned int strhashval = clientstr_hashval(name);
3781 struct nfs4_client *clp;
3782
a1bcecd2 3783 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3784 return clp ? 1 : 0;
3785}
3786
1da177e4
LT		 3787/*
3788 * failure => all reset bets are off, nfserr_no_grace...
3789 */
190e4fbf
N		 3790int
3791nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3792{
3793 unsigned int strhashval;
3794 struct nfs4_client_reclaim *crp = NULL;
3795
a55370a3
N		 3796 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3797 crp = alloc_reclaim();
1da177e4
LT		 3798 if (!crp)
3799 return 0;
a55370a3 3800 strhashval = clientstr_hashval(name);
1da177e4
LT		 3801 INIT_LIST_HEAD(&crp->cr_strhash);
3802 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3803 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3804 reclaim_str_hashtbl_size++;
3805 return 1;
3806}
3807
3808static void
3809nfs4_release_reclaim(void)
3810{
3811 struct nfs4_client_reclaim *crp = NULL;
3812 int i;
3813
1da177e4
LT		 3814 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3815 while (!list_empty(&reclaim_str_hashtbl[i])) {
3816 crp = list_entry(reclaim_str_hashtbl[i].next,
3817 struct nfs4_client_reclaim, cr_strhash);
3818 list_del(&crp->cr_strhash);
1da177e4
LT		 3819 kfree(crp);
3820 reclaim_str_hashtbl_size--;
3821 }
3822 }
3823 BUG_ON(reclaim_str_hashtbl_size);
3824}
3825
3826/*
3827 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3828static struct nfs4_client_reclaim *
1da177e4
LT		 3829nfs4_find_reclaim_client(clientid_t *clid)
3830{
3831 unsigned int strhashval;
3832 struct nfs4_client *clp;
3833 struct nfs4_client_reclaim *crp = NULL;
3834
3835
3836 /* find clientid in conf_id_hashtbl */
3837 clp = find_confirmed_client(clid);
3838 if (clp == NULL)
3839 return NULL;
3840
a55370a3
N		 3841 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3842 clp->cl_name.len, clp->cl_name.data,
3843 clp->cl_recdir);
1da177e4
LT		 3844
3845 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3846 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3847 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3848 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3849 return crp;
3850 }
3851 }
3852 return NULL;
3853}
3854
3855/*
3856* Called from OPEN. Look for clientid in reclaim list.
3857*/
b37ad28b 3858__be32
1da177e4
LT		 3859nfs4_check_open_reclaim(clientid_t *clid)
3860{
dfc83565 3861 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3862}
3863
ac4d8ff2 3864/* initialization to perform at module load time: */
1da177e4 3865
e8ff2a84 3866int
ac4d8ff2 3867nfs4_state_init(void)
1da177e4 3868{
e8ff2a84 3869 int i, status;
1da177e4 3870
e8ff2a84
BF		 3871 status = nfsd4_init_slabs();
3872 if (status)
3873 return status;
1da177e4
LT		 3874 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3875 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3876 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3877 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3878 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3879 }
5282fd72
ME		 3880 for (i = 0; i < SESSION_HASH_SIZE; i++)
3881 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3882 for (i = 0; i < FILE_HASH_SIZE; i++) {
3883 INIT_LIST_HEAD(&file_hashtbl[i]);
3884 }
3885 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3886 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3887 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3888 }
3889 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3890 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3891 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3892 }
3893 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3894 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3895 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3896 }
1da177e4 3897 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3898 INIT_LIST_HEAD(&close_lru);
3899 INIT_LIST_HEAD(&client_lru);
3900 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3901 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3902 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3903 reclaim_str_hashtbl_size = 0;
e8ff2a84 3904 return 0;
ac4d8ff2
N		 3905}
3906
190e4fbf
N		 3907static void
3908nfsd4_load_reboot_recovery_data(void)
3909{
3910 int status;
3911
0964a3d3
N		 3912 nfs4_lock_state();
3913 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3914 status = nfsd4_recdir_load();
0964a3d3 3915 nfs4_unlock_state();
190e4fbf
N		 3916 if (status)
3917 printk("NFSD: Failure reading reboot recovery data\n");
3918}
3919
9a8db97e
ME		 3920unsigned long
3921get_nfs4_grace_period(void)
3922{
3923 return max(user_lease_time, lease_time) * HZ;
3924}
3925
c2f1a551
MS		 3926/*
3927 * Since the lifetime of a delegation isn't limited to that of an open, a
3928 * client may quite reasonably hang on to a delegation as long as it has
3929 * the inode cached. This becomes an obvious problem the first time a
3930 * client's inode cache approaches the size of the server's total memory.
3931 *
3932 * For now we avoid this problem by imposing a hard limit on the number
3933 * of delegations, which varies according to the server's memory size.
3934 */
3935static void
3936set_max_delegations(void)
3937{
3938 /*
3939 * Allow at most 4 delegations per megabyte of RAM. Quick
3940 * estimates suggest that in the worst case (where every delegation
3941 * is for a different inode), a delegation could take about 1.5K,
3942 * giving a worst case usage of about 6% of memory.
3943 */
3944 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3945}
3946
ac4d8ff2
N		 3947/* initialization to perform when the nfsd service is started: */
3948
3949static void
3950__nfs4_state_start(void)
3951{
9a8db97e 3952 unsigned long grace_time;
ac4d8ff2 3953
1da177e4 3954 boot_time = get_seconds();
af558e33 3955 grace_time = get_nfs4_grace_period();
d99a05ad 3956 lease_time = user_lease_time;
af558e33 3957 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3958 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3959 grace_time/HZ);
58da282b 3960 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3961 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3962 set_max_delegations();
1da177e4
LT		 3963}
3964
e8ff2a84 3965void
76a3550e 3966nfs4_state_start(void)
1da177e4 3967{
1da177e4 3968 if (nfs4_init)
e8ff2a84 3969 return;
190e4fbf 3970 nfsd4_load_reboot_recovery_data();
76a3550e 3971 __nfs4_state_start();
1da177e4 3972 nfs4_init = 1;
e8ff2a84 3973 return;
1da177e4
LT		 3974}
3975
1da177e4
LT		 3976time_t
3977nfs4_lease_time(void)
3978{
3979 return lease_time;
3980}
3981
3982static void
3983__nfs4_state_shutdown(void)
3984{
3985 int i;
3986 struct nfs4_client *clp = NULL;
3987 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3988 struct list_head *pos, *next, reaplist;
3989
1da177e4
LT		 3990 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3991 while (!list_empty(&conf_id_hashtbl[i])) {
3992 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3993 expire_client(clp);
3994 }
3995 while (!list_empty(&unconf_str_hashtbl[i])) {
3996 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3997 expire_client(clp);
3998 }
3999 }
4000 INIT_LIST_HEAD(&reaplist);
4001 spin_lock(&recall_lock);
4002 list_for_each_safe(pos, next, &del_recall_lru) {
4003 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4004 list_move(&dp->dl_recall_lru, &reaplist);
4005 }
4006 spin_unlock(&recall_lock);
4007 list_for_each_safe(pos, next, &reaplist) {
4008 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4009 list_del_init(&dp->dl_recall_lru);
4010 unhash_delegation(dp);
4011 }
4012
190e4fbf 4013 nfsd4_shutdown_recdir();
1da177e4 4014 nfs4_init = 0;
1da177e4
LT		 4015}
4016
4017void
4018nfs4_state_shutdown(void)
4019{
5e8d5c29
N		 4020 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4021 destroy_workqueue(laundry_wq);
2c5e7615 4022 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 4023 nfs4_lock_state();
4024 nfs4_release_reclaim();
4025 __nfs4_state_shutdown();
1da177e4
LT		 4026 nfs4_unlock_state();
4027}
4028
3dd98a3b
JL		 4029/*
4030 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4031 * accessed when nfsd is starting.
4032 */
0964a3d3
N		 4033static void
4034nfs4_set_recdir(char *recdir)
4035{
0964a3d3 4036 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 4037}
4038
4039/*
4040 * Change the NFSv4 recovery directory to recdir.
4041 */
4042int
4043nfs4_reset_recoverydir(char *recdir)
4044{
4045 int status;
a63bb996 4046 struct path path;
0964a3d3 4047
a63bb996 4048 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 4049 if (status)
4050 return status;
4051 status = -ENOTDIR;
a63bb996 4052 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 4053 nfs4_set_recdir(recdir);
4054 status = 0;
4055 }
a63bb996 4056 path_put(&path);
0964a3d3
N		 4057 return status;
4058}
4059
3dd98a3b
JL		 4060char *
4061nfs4_recoverydir(void)
4062{
4063 return user_recovery_dirname;
4064}
4065
1da177e4
LT		 4066/*
4067 * Called when leasetime is changed.
4068 *
d99a05ad
N		 4069 * The only way the protocol gives us to handle on-the-fly lease changes is to
4070 * simulate a reboot. Instead of doing that, we just wait till the next time
4071 * we start to register any changes in lease time. If the administrator
4072 * really wants to change the lease time *now*, they can go ahead and bring
4073 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 4074 *
4075 * user_lease_time is protected by nfsd_mutex since it's only really accessed
4076 * when nfsd is starting
1da177e4
LT		 4077 */
4078void
4079nfs4_reset_lease(time_t leasetime)
4080{
d99a05ad 4081 user_lease_time = leasetime;
1da177e4 4082}
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