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nfsd41: proc stubs
[linux-2.6-block.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 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4 80
8b671b80
BF		 81/* Locking: */
82
83/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 84static DEFINE_MUTEX(client_mutex);
1da177e4 85
8b671b80
BF		 86/*
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
90 */
91static DEFINE_SPINLOCK(recall_lock);
92
e18b890b
CL		 93static struct kmem_cache *stateowner_slab = NULL;
94static struct kmem_cache *file_slab = NULL;
95static struct kmem_cache *stateid_slab = NULL;
96static struct kmem_cache *deleg_slab = NULL;
e60d4398 97
1da177e4
LT		 98void
99nfs4_lock_state(void)
100{
353ab6e9 101 mutex_lock(&client_mutex);
1da177e4
LT		 102}
103
104void
105nfs4_unlock_state(void)
106{
353ab6e9 107 mutex_unlock(&client_mutex);
1da177e4
LT		 108}
109
110static inline u32
111opaque_hashval(const void *ptr, int nbytes)
112{
113 unsigned char *cptr = (unsigned char *) ptr;
114
115 u32 x = 0;
116 while (nbytes--) {
117 x *= 37;
118 x += *cptr++;
119 }
120 return x;
121}
122
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static inline void
126put_nfs4_file(struct nfs4_file *fi)
127{
8b671b80
BF		 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
131 iput(fi->fi_inode);
132 kmem_cache_free(file_slab, fi);
133 }
13cd2184
N		 134}
135
136static inline void
137get_nfs4_file(struct nfs4_file *fi)
138{
8b671b80 139 atomic_inc(&fi->fi_ref);
13cd2184
N		 140}
141
ef0f3390 142static int num_delegations;
c2f1a551 143unsigned int max_delegations;
ef0f3390
N		 144
145/*
146 * Open owner state (share locks)
147 */
148
149/* hash tables for nfs4_stateowner */
150#define OWNER_HASH_BITS 8
151#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
153
154#define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156#define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
158
159static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
161
162/* hash table for nfs4_file */
163#define FILE_HASH_BITS 8
164#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166/* hash table for (open)nfs4_stateid */
167#define STATEID_HASH_BITS 10
168#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
170
171#define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173#define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
175
176static struct list_head file_hashtbl[FILE_HASH_SIZE];
177static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
178
1da177e4
LT		 179static struct nfs4_delegation *
180alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
181{
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
185
186 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 187 if (fp->fi_had_conflict)
188 return NULL;
c2f1a551 189 if (num_delegations > max_delegations)
ef0f3390 190 return NULL;
5b2d21c1
N		 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
192 if (dp == NULL)
1da177e4 193 return dp;
ef0f3390 194 num_delegations++;
ea1da636
N		 195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 197 INIT_LIST_HEAD(&dp->dl_recall_lru);
198 dp->dl_client = clp;
13cd2184 199 get_nfs4_file(fp);
1da177e4
LT		 200 dp->dl_file = fp;
201 dp->dl_flock = NULL;
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
204 dp->dl_type = type;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
5282fd72
ME		 385static DEFINE_SPINLOCK(sessionid_lock);
386#define SESSION_HASH_SIZE 512
387static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
388
389static inline int
390hash_sessionid(struct nfs4_sessionid *sessionid)
391{
392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
393
394 return sid->sequence % SESSION_HASH_SIZE;
395}
396
397static inline void
398dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
399{
400 u32 *ptr = (u32 *)(&sessionid->data[0]);
401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
402}
403
404/* caller must hold sessionid_lock */
405static struct nfsd4_session *
406find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
407{
408 struct nfsd4_session *elem;
409 int idx;
410
411 dump_sessionid(__func__, sessionid);
412 idx = hash_sessionid(sessionid);
413 dprintk("%s: idx is %d\n", __func__, idx);
414 /* Search in the appropriate list */
415 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
416 dump_sessionid("list traversal", &elem->se_sessionid);
417 if (!memcmp(elem->se_sessionid.data, sessionid->data,
418 NFS4_MAX_SESSIONID_LEN)) {
419 return elem;
420 }
421 }
422
423 dprintk("%s: session not found\n", __func__);
424 return NULL;
425}
426
427/* caller must hold sessionid_lock */
7116ed6b 428static void
5282fd72 429unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 430{
431 list_del(&ses->se_hash);
432 list_del(&ses->se_perclnt);
5282fd72
ME		 433}
434
435static void
436release_session(struct nfsd4_session *ses)
437{
438 spin_lock(&sessionid_lock);
439 unhash_session(ses);
440 spin_unlock(&sessionid_lock);
7116ed6b
AA		 441 nfsd4_put_session(ses);
442}
443
444void
445free_session(struct kref *kref)
446{
447 struct nfsd4_session *ses;
448
449 ses = container_of(kref, struct nfsd4_session, se_ref);
450 kfree(ses->se_slots);
451 kfree(ses);
452}
453
1da177e4
LT		 454static inline void
455renew_client(struct nfs4_client *clp)
456{
457 /*
458 * Move client to the end to the LRU list.
459 */
460 dprintk("renewing client (clientid %08x/%08x)\n",
461 clp->cl_clientid.cl_boot,
462 clp->cl_clientid.cl_id);
463 list_move_tail(&clp->cl_lru, &client_lru);
464 clp->cl_time = get_seconds();
465}
466
467/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
468static int
469STALE_CLIENTID(clientid_t *clid)
470{
471 if (clid->cl_boot == boot_time)
472 return 0;
473 dprintk("NFSD stale clientid (%08x/%08x)\n",
474 clid->cl_boot, clid->cl_id);
475 return 1;
476}
477
478/*
479 * XXX Should we use a slab cache ?
480 * This type of memory management is somewhat inefficient, but we use it
481 * anyway since SETCLIENTID is not a common operation.
482 */
35bba9a3 483static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 484{
485 struct nfs4_client *clp;
486
35bba9a3
BF		 487 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
488 if (clp == NULL)
489 return NULL;
490 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
491 if (clp->cl_name.data == NULL) {
492 kfree(clp);
493 return NULL;
1da177e4 494 }
35bba9a3
BF		 495 memcpy(clp->cl_name.data, name.data, name.len);
496 clp->cl_name.len = name.len;
1da177e4
LT		 497 return clp;
498}
499
1b1a9b31
BF		 500static void
501shutdown_callback_client(struct nfs4_client *clp)
502{
503 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
504
1b1a9b31 505 if (clnt) {
404ec117
BF		 506 /*
507 * Callback threads take a reference on the client, so there
508 * should be no outstanding callbacks at this point.
509 */
1b1a9b31
BF		 510 clp->cl_callback.cb_client = NULL;
511 rpc_shutdown_client(clnt);
512 }
513}
514
1da177e4
LT		 515static inline void
516free_client(struct nfs4_client *clp)
517{
1b1a9b31 518 shutdown_callback_client(clp);
1da177e4
LT		 519 if (clp->cl_cred.cr_group_info)
520 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 521 kfree(clp->cl_principal);
1da177e4
LT		 522 kfree(clp->cl_name.data);
523 kfree(clp);
524}
525
526void
527put_nfs4_client(struct nfs4_client *clp)
528{
529 if (atomic_dec_and_test(&clp->cl_count))
530 free_client(clp);
531}
532
533static void
534expire_client(struct nfs4_client *clp)
535{
536 struct nfs4_stateowner *sop;
537 struct nfs4_delegation *dp;
1da177e4
LT		 538 struct list_head reaplist;
539
540 dprintk("NFSD: expire_client cl_count %d\n",
541 atomic_read(&clp->cl_count));
542
1da177e4
LT		 543 INIT_LIST_HEAD(&reaplist);
544 spin_lock(&recall_lock);
ea1da636
N		 545 while (!list_empty(&clp->cl_delegations)) {
546 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 547 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
548 dp->dl_flock);
ea1da636 549 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 550 list_move(&dp->dl_recall_lru, &reaplist);
551 }
552 spin_unlock(&recall_lock);
553 while (!list_empty(&reaplist)) {
554 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
555 list_del_init(&dp->dl_recall_lru);
556 unhash_delegation(dp);
557 }
558 list_del(&clp->cl_idhash);
559 list_del(&clp->cl_strhash);
560 list_del(&clp->cl_lru);
ea1da636
N		 561 while (!list_empty(&clp->cl_openowners)) {
562 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 563 release_openowner(sop);
1da177e4 564 }
c4bf7868
ME		 565 while (!list_empty(&clp->cl_sessions)) {
566 struct nfsd4_session *ses;
567 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
568 se_perclnt);
569 release_session(ses);
570 }
1da177e4
LT		 571 put_nfs4_client(clp);
572}
573
35bba9a3
BF		 574static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
575{
1da177e4
LT		 576 struct nfs4_client *clp;
577
35bba9a3
BF		 578 clp = alloc_client(name);
579 if (clp == NULL)
580 return NULL;
a55370a3 581 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 582 atomic_set(&clp->cl_count, 1);
583 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 584 INIT_LIST_HEAD(&clp->cl_idhash);
585 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 586 INIT_LIST_HEAD(&clp->cl_openowners);
587 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 588 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 589 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 590 return clp;
591}
592
35bba9a3
BF		 593static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
594{
595 memcpy(target->cl_verifier.data, source->data,
596 sizeof(target->cl_verifier.data));
1da177e4
LT		 597}
598
35bba9a3
BF		 599static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
600{
1da177e4
LT		 601 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
602 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
603}
604
35bba9a3
BF		 605static void copy_cred(struct svc_cred *target, struct svc_cred *source)
606{
1da177e4
LT		 607 target->cr_uid = source->cr_uid;
608 target->cr_gid = source->cr_gid;
609 target->cr_group_info = source->cr_group_info;
610 get_group_info(target->cr_group_info);
611}
612
35bba9a3 613static int same_name(const char *n1, const char *n2)
599e0a22 614{
a55370a3 615 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 616}
617
618static int
599e0a22
BF		 619same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
620{
621 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 622}
623
624static int
599e0a22
BF		 625same_clid(clientid_t *cl1, clientid_t *cl2)
626{
627 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 628}
629
630/* XXX what about NGROUP */
631static int
599e0a22
BF		 632same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
633{
634 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 635}
636
5ec7b46c
BF		 637static void gen_clid(struct nfs4_client *clp)
638{
639 static u32 current_clientid = 1;
640
1da177e4
LT		 641 clp->cl_clientid.cl_boot = boot_time;
642 clp->cl_clientid.cl_id = current_clientid++;
643}
644
deda2faa
BF		 645static void gen_confirm(struct nfs4_client *clp)
646{
647 static u32 i;
648 u32 *p;
1da177e4 649
1da177e4 650 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 651 *p++ = get_seconds();
652 *p++ = i++;
1da177e4
LT		 653}
654
35bba9a3
BF		 655static int check_name(struct xdr_netobj name)
656{
1da177e4
LT		 657 if (name.len == 0)
658 return 0;
659 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 660 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 661 return 0;
662 }
663 return 1;
664}
665
fd39ca9a 666static void
1da177e4
LT		 667add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
668{
669 unsigned int idhashval;
670
671 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
672 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
673 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
674 list_add_tail(&clp->cl_lru, &client_lru);
675 clp->cl_time = get_seconds();
676}
677
fd39ca9a 678static void
1da177e4
LT		 679move_to_confirmed(struct nfs4_client *clp)
680{
681 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
682 unsigned int strhashval;
683
684 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
685 list_del_init(&clp->cl_strhash);
f116629d 686 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 687 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 688 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
689 renew_client(clp);
690}
691
692static struct nfs4_client *
693find_confirmed_client(clientid_t *clid)
694{
695 struct nfs4_client *clp;
696 unsigned int idhashval = clientid_hashval(clid->cl_id);
697
698 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 699 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 700 return clp;
701 }
702 return NULL;
703}
704
705static struct nfs4_client *
706find_unconfirmed_client(clientid_t *clid)
707{
708 struct nfs4_client *clp;
709 unsigned int idhashval = clientid_hashval(clid->cl_id);
710
711 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 712 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 713 return clp;
714 }
715 return NULL;
716}
717
28ce6054
N		 718static struct nfs4_client *
719find_confirmed_client_by_str(const char *dname, unsigned int hashval)
720{
721 struct nfs4_client *clp;
722
723 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
724 if (same_name(clp->cl_recdir, dname))
725 return clp;
726 }
727 return NULL;
728}
729
730static struct nfs4_client *
731find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
732{
733 struct nfs4_client *clp;
734
735 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
736 if (same_name(clp->cl_recdir, dname))
737 return clp;
738 }
739 return NULL;
740}
741
1da177e4
LT		 742/* a helper function for parse_callback */
743static int
744parse_octet(unsigned int *lenp, char **addrp)
745{
746 unsigned int len = *lenp;
747 char *p = *addrp;
748 int n = -1;
749 char c;
750
751 for (;;) {
752 if (!len)
753 break;
754 len--;
755 c = *p++;
756 if (c == '.')
757 break;
758 if ((c < '0') || (c > '9')) {
759 n = -1;
760 break;
761 }
762 if (n < 0)
763 n = 0;
764 n = (n * 10) + (c - '0');
765 if (n > 255) {
766 n = -1;
767 break;
768 }
769 }
770 *lenp = len;
771 *addrp = p;
772 return n;
773}
774
775/* parse and set the setclientid ipv4 callback address */
fd39ca9a 776static int
1da177e4
LT		 777parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
778{
779 int temp = 0;
780 u32 cbaddr = 0;
781 u16 cbport = 0;
782 u32 addrlen = addr_len;
783 char *addr = addr_val;
784 int i, shift;
785
786 /* ipaddress */
787 shift = 24;
788 for(i = 4; i > 0 ; i--) {
789 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
790 return 0;
791 }
792 cbaddr |= (temp << shift);
793 if (shift > 0)
794 shift -= 8;
795 }
796 *cbaddrp = cbaddr;
797
798 /* port */
799 shift = 8;
800 for(i = 2; i > 0 ; i--) {
801 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
802 return 0;
803 }
804 cbport |= (temp << shift);
805 if (shift > 0)
806 shift -= 8;
807 }
808 *cbportp = cbport;
809 return 1;
810}
811
fd39ca9a 812static void
1da177e4
LT		 813gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
814{
815 struct nfs4_callback *cb = &clp->cl_callback;
816
817 /* Currently, we only support tcp for the callback channel */
818 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
819 goto out_err;
820
821 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
822 &cb->cb_addr, &cb->cb_port)))
823 goto out_err;
824 cb->cb_prog = se->se_callback_prog;
825 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 826 return;
827out_err:
849823c5 828 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 829 "will not receive delegations\n",
830 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
831
1da177e4
LT		 832 return;
833}
834
069b6ad4
AA		 835__be32
836nfsd4_exchange_id(struct svc_rqst *rqstp,
837 struct nfsd4_compound_state *cstate,
838 struct nfsd4_exchange_id *exid)
839{
840 return -1; /* stub */
841}
842
843__be32
844nfsd4_create_session(struct svc_rqst *rqstp,
845 struct nfsd4_compound_state *cstate,
846 struct nfsd4_create_session *cr_ses)
847{
848 return -1; /* stub */
849}
850
851__be32
852nfsd4_destroy_session(struct svc_rqst *r,
853 struct nfsd4_compound_state *cstate,
854 struct nfsd4_destroy_session *sessionid)
855{
856 return -1; /* stub */
857}
858
859__be32
860nfsd4_sequence(struct svc_rqst *r,
861 struct nfsd4_compound_state *cstate,
862 struct nfsd4_sequence *seq)
863{
864 return -1; /* stub */
865}
866
b37ad28b 867__be32
b591480b
BF		 868nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
869 struct nfsd4_setclientid *setclid)
1da177e4 870{
27459f09 871 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 872 struct xdr_netobj clname = {
873 .len = setclid->se_namelen,
874 .data = setclid->se_name,
875 };
876 nfs4_verifier clverifier = setclid->se_verf;
877 unsigned int strhashval;
28ce6054 878 struct nfs4_client *conf, *unconf, *new;
b37ad28b 879 __be32 status;
68e76ad0 880 char *princ;
a55370a3 881 char dname[HEXDIR_LEN];
1da177e4 882
1da177e4 883 if (!check_name(clname))
73aea4ec 884 return nfserr_inval;
1da177e4 885
a55370a3
N		 886 status = nfs4_make_rec_clidname(dname, &clname);
887 if (status)
73aea4ec 888 return status;
a55370a3 889
1da177e4
LT		 890 /*
891 * XXX The Duplicate Request Cache (DRC) has been checked (??)
892 * We get here on a DRC miss.
893 */
894
a55370a3 895 strhashval = clientstr_hashval(dname);
1da177e4 896
1da177e4 897 nfs4_lock_state();
28ce6054
N		 898 conf = find_confirmed_client_by_str(dname, strhashval);
899 if (conf) {
a186e767 900 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 901 status = nfserr_clid_inuse;
026722c2
BF		 902 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
903 dprintk("NFSD: setclientid: string in use by client"
904 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 905 goto out;
906 }
1da177e4 907 }
a186e767
BF		 908 /*
909 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
910 * has a description of SETCLIENTID request processing consisting
911 * of 5 bullet points, labeled as CASE0 - CASE4 below.
912 */
28ce6054 913 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 914 status = nfserr_resource;
915 if (!conf) {
a186e767
BF		 916 /*
917 * RFC 3530 14.2.33 CASE 4:
918 * placed first, because it is the normal case
1da177e4
LT		 919 */
920 if (unconf)
921 expire_client(unconf);
a55370a3
N		 922 new = create_client(clname, dname);
923 if (new == NULL)
1da177e4 924 goto out;
1da177e4 925 gen_clid(new);
599e0a22 926 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 927 /*
a186e767
BF		 928 * RFC 3530 14.2.33 CASE 1:
929 * probable callback update
1da177e4 930 */
31f4a6c1
N		 931 if (unconf) {
932 /* Note this is removing unconfirmed {*x***},
933 * which is stronger than RFC recommended {vxc**}.
934 * This has the advantage that there is at most
935 * one {*x***} in either list at any time.
936 */
937 expire_client(unconf);
1da177e4 938 }
a55370a3
N		 939 new = create_client(clname, dname);
940 if (new == NULL)
1da177e4 941 goto out;
1da177e4 942 copy_clid(new, conf);
1da177e4
LT		 943 } else if (!unconf) {
944 /*
a186e767
BF		 945 * RFC 3530 14.2.33 CASE 2:
946 * probable client reboot; state will be removed if
947 * confirmed.
1da177e4 948 */
a55370a3
N		 949 new = create_client(clname, dname);
950 if (new == NULL)
1da177e4 951 goto out;
1da177e4 952 gen_clid(new);
49ba8781 953 } else {
a186e767
BF		 954 /*
955 * RFC 3530 14.2.33 CASE 3:
956 * probable client reboot; state will be removed if
957 * confirmed.
1da177e4
LT		 958 */
959 expire_client(unconf);
a55370a3
N		 960 new = create_client(clname, dname);
961 if (new == NULL)
1da177e4 962 goto out;
1da177e4 963 gen_clid(new);
1da177e4 964 }
c175b83c
BF		 965 copy_verf(new, &clverifier);
966 new->cl_addr = sin->sin_addr.s_addr;
61054b14 967 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 968 princ = svc_gss_principal(rqstp);
969 if (princ) {
970 new->cl_principal = kstrdup(princ, GFP_KERNEL);
971 if (new->cl_principal == NULL) {
972 free_client(new);
973 goto out;
974 }
975 }
c175b83c
BF		 976 copy_cred(&new->cl_cred, &rqstp->rq_cred);
977 gen_confirm(new);
978 gen_callback(new, setclid);
979 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 980 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
981 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
982 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
983 status = nfs_ok;
984out:
985 nfs4_unlock_state();
986 return status;
987}
988
989
990/*
a186e767
BF		 991 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
992 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
993 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 994 */
b37ad28b 995__be32
b591480b
BF		 996nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
997 struct nfsd4_compound_state *cstate,
998 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 999{
27459f09 1000 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1001 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1002 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1003 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1004 __be32 status;
1da177e4
LT		 1005
1006 if (STALE_CLIENTID(clid))
1007 return nfserr_stale_clientid;
1008 /*
1009 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1010 * We get here on a DRC miss.
1011 */
1012
1013 nfs4_lock_state();
21ab45a4
N		 1014
1015 conf = find_confirmed_client(clid);
1016 unconf = find_unconfirmed_client(clid);
1017
1018 status = nfserr_clid_inuse;
27459f09 1019 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1020 goto out;
27459f09 1021 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1022 goto out;
1023
a186e767
BF		 1024 /*
1025 * section 14.2.34 of RFC 3530 has a description of
1026 * SETCLIENTID_CONFIRM request processing consisting
1027 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1028 */
366e0c1d 1029 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1030 /*
1031 * RFC 3530 14.2.34 CASE 1:
1032 * callback update
1033 */
599e0a22 1034 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1035 status = nfserr_clid_inuse;
1036 else {
1a69c179
N		 1037 /* XXX: We just turn off callbacks until we can handle
1038 * change request correctly. */
cb36d634 1039 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1040 gen_confirm(conf);
46309029 1041 nfsd4_remove_clid_dir(unconf);
1a69c179 1042 expire_client(unconf);
1da177e4 1043 status = nfs_ok;
1a69c179 1044
1da177e4 1045 }
f3aba4e5 1046 } else if (conf && !unconf) {
a186e767
BF		 1047 /*
1048 * RFC 3530 14.2.34 CASE 2:
1049 * probable retransmitted request; play it safe and
1050 * do nothing.
7c79f737 1051 */
599e0a22 1052 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1053 status = nfserr_clid_inuse;
21ab45a4 1054 else
1da177e4 1055 status = nfs_ok;
7c79f737 1056 } else if (!conf && unconf
599e0a22 1057 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1058 /*
1059 * RFC 3530 14.2.34 CASE 3:
1060 * Normal case; new or rebooted client:
7c79f737 1061 */
599e0a22 1062 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1063 status = nfserr_clid_inuse;
1064 } else {
1a69c179
N		 1065 unsigned int hash =
1066 clientstr_hashval(unconf->cl_recdir);
1067 conf = find_confirmed_client_by_str(unconf->cl_recdir,
1068 hash);
1069 if (conf) {
c7b9a459 1070 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1071 expire_client(conf);
1072 }
1da177e4 1073 move_to_confirmed(unconf);
21ab45a4 1074 conf = unconf;
46f8a64b 1075 nfsd4_probe_callback(conf);
1a69c179 1076 status = nfs_ok;
1da177e4 1077 }
599e0a22
BF		 1078 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1079 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1080 &confirm)))) {
a186e767
BF		 1081 /*
1082 * RFC 3530 14.2.34 CASE 4:
1083 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1084 */
1da177e4 1085 status = nfserr_stale_clientid;
7c79f737 1086 } else {
08e8987c
N		 1087 /* check that we have hit one of the cases...*/
1088 status = nfserr_clid_inuse;
1089 }
1da177e4 1090out:
1da177e4
LT		 1091 nfs4_unlock_state();
1092 return status;
1093}
1094
1da177e4
LT		 1095/* OPEN Share state helper functions */
1096static inline struct nfs4_file *
1097alloc_init_file(struct inode *ino)
1098{
1099 struct nfs4_file *fp;
1100 unsigned int hashval = file_hashval(ino);
1101
e60d4398
N		 1102 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1103 if (fp) {
8b671b80 1104 atomic_set(&fp->fi_ref, 1);
1da177e4 1105 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1106 INIT_LIST_HEAD(&fp->fi_stateids);
1107 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1108 spin_lock(&recall_lock);
1da177e4 1109 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1110 spin_unlock(&recall_lock);
1da177e4
LT		 1111 fp->fi_inode = igrab(ino);
1112 fp->fi_id = current_fileid++;
47f9940c 1113 fp->fi_had_conflict = false;
1da177e4
LT		 1114 return fp;
1115 }
1116 return NULL;
1117}
1118
e60d4398 1119static void
e18b890b 1120nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1121{
e60d4398
N		 1122 if (*slab == NULL)
1123 return;
1a1d92c1 1124 kmem_cache_destroy(*slab);
e60d4398 1125 *slab = NULL;
1da177e4
LT		 1126}
1127
e8ff2a84 1128void
1da177e4
LT		 1129nfsd4_free_slabs(void)
1130{
e60d4398
N		 1131 nfsd4_free_slab(&stateowner_slab);
1132 nfsd4_free_slab(&file_slab);
5ac049ac 1133 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1134 nfsd4_free_slab(&deleg_slab);
e60d4398 1135}
1da177e4 1136
e60d4398
N		 1137static int
1138nfsd4_init_slabs(void)
1139{
1140 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1141 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1142 if (stateowner_slab == NULL)
1143 goto out_nomem;
1144 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1145 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1146 if (file_slab == NULL)
1147 goto out_nomem;
5ac049ac 1148 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1149 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1150 if (stateid_slab == NULL)
1151 goto out_nomem;
5b2d21c1 1152 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1153 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1154 if (deleg_slab == NULL)
1155 goto out_nomem;
e60d4398
N		 1156 return 0;
1157out_nomem:
1158 nfsd4_free_slabs();
1159 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1160 return -ENOMEM;
1da177e4
LT		 1161}
1162
1163void
1164nfs4_free_stateowner(struct kref *kref)
1165{
1166 struct nfs4_stateowner *sop =
1167 container_of(kref, struct nfs4_stateowner, so_ref);
1168 kfree(sop->so_owner.data);
1169 kmem_cache_free(stateowner_slab, sop);
1170}
1171
1172static inline struct nfs4_stateowner *
1173alloc_stateowner(struct xdr_netobj *owner)
1174{
1175 struct nfs4_stateowner *sop;
1176
1177 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1178 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1179 memcpy(sop->so_owner.data, owner->data, owner->len);
1180 sop->so_owner.len = owner->len;
1181 kref_init(&sop->so_ref);
1182 return sop;
1183 }
1184 kmem_cache_free(stateowner_slab, sop);
1185 }
1186 return NULL;
1187}
1188
1189static struct nfs4_stateowner *
1190alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1191 struct nfs4_stateowner *sop;
1192 struct nfs4_replay *rp;
1193 unsigned int idhashval;
1194
1195 if (!(sop = alloc_stateowner(&open->op_owner)))
1196 return NULL;
1197 idhashval = ownerid_hashval(current_ownerid);
1198 INIT_LIST_HEAD(&sop->so_idhash);
1199 INIT_LIST_HEAD(&sop->so_strhash);
1200 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1201 INIT_LIST_HEAD(&sop->so_stateids);
1202 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1203 INIT_LIST_HEAD(&sop->so_close_lru);
1204 sop->so_time = 0;
1205 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1206 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1207 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1208 sop->so_is_open_owner = 1;
1209 sop->so_id = current_ownerid++;
1210 sop->so_client = clp;
1211 sop->so_seqid = open->op_seqid;
1212 sop->so_confirmed = 0;
1213 rp = &sop->so_replay;
de1ae286 1214 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1215 rp->rp_buflen = 0;
1216 rp->rp_buf = rp->rp_ibuf;
1217 return sop;
1218}
1219
1da177e4
LT		 1220static inline void
1221init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1222 struct nfs4_stateowner *sop = open->op_stateowner;
1223 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1224
1225 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1226 INIT_LIST_HEAD(&stp->st_perstateowner);
1227 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1228 INIT_LIST_HEAD(&stp->st_perfile);
1229 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1230 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1231 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1232 stp->st_stateowner = sop;
13cd2184 1233 get_nfs4_file(fp);
1da177e4
LT		 1234 stp->st_file = fp;
1235 stp->st_stateid.si_boot = boot_time;
1236 stp->st_stateid.si_stateownerid = sop->so_id;
1237 stp->st_stateid.si_fileid = fp->fi_id;
1238 stp->st_stateid.si_generation = 0;
1239 stp->st_access_bmap = 0;
1240 stp->st_deny_bmap = 0;
1241 __set_bit(open->op_share_access, &stp->st_access_bmap);
1242 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1243 stp->st_openstp = NULL;
1da177e4
LT		 1244}
1245
fd39ca9a 1246static void
1da177e4
LT		 1247move_to_close_lru(struct nfs4_stateowner *sop)
1248{
1249 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1250
358dd55a 1251 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1252 sop->so_time = get_seconds();
1253}
1254
1da177e4 1255static int
599e0a22
BF		 1256same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1257 clientid_t *clid)
1258{
1259 return (sop->so_owner.len == owner->len) &&
1260 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1261 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1262}
1263
1264static struct nfs4_stateowner *
1265find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1266{
1267 struct nfs4_stateowner *so = NULL;
1268
1269 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1270 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1271 return so;
1272 }
1273 return NULL;
1274}
1275
1276/* search file_hashtbl[] for file */
1277static struct nfs4_file *
1278find_file(struct inode *ino)
1279{
1280 unsigned int hashval = file_hashval(ino);
1281 struct nfs4_file *fp;
1282
8b671b80 1283 spin_lock(&recall_lock);
1da177e4 1284 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1285 if (fp->fi_inode == ino) {
1286 get_nfs4_file(fp);
8b671b80 1287 spin_unlock(&recall_lock);
1da177e4 1288 return fp;
13cd2184 1289 }
1da177e4 1290 }
8b671b80 1291 spin_unlock(&recall_lock);
1da177e4
LT		 1292 return NULL;
1293}
1294
8838dc43 1295static inline int access_valid(u32 x)
ba5a6a19 1296{
8838dc43
BF		 1297 if (x < NFS4_SHARE_ACCESS_READ)
1298 return 0;
1299 if (x > NFS4_SHARE_ACCESS_BOTH)
1300 return 0;
1301 return 1;
ba5a6a19
BF		 1302}
1303
8838dc43 1304static inline int deny_valid(u32 x)
ba5a6a19 1305{
8838dc43
BF		 1306 /* Note: unlike access bits, deny bits may be zero. */
1307 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1308}
1da177e4 1309
4f83aa30
BF		 1310/*
1311 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1312 * st_{access,deny}_bmap field of the stateid, in order to track not
1313 * only what share bits are currently in force, but also what
1314 * combinations of share bits previous opens have used. This allows us
1315 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1316 * return an error if the client attempt to downgrade to a combination
1317 * of share bits not explicable by closing some of its previous opens.
1318 *
1319 * XXX: This enforcement is actually incomplete, since we don't keep
1320 * track of access/deny bit combinations; so, e.g., we allow:
1321 *
1322 * OPEN allow read, deny write
1323 * OPEN allow both, deny none
1324 * DOWNGRADE allow read, deny none
1325 *
1326 * which we should reject.
1327 */
fd39ca9a 1328static void
1da177e4
LT		 1329set_access(unsigned int *access, unsigned long bmap) {
1330 int i;
1331
1332 *access = 0;
1333 for (i = 1; i < 4; i++) {
1334 if (test_bit(i, &bmap))
1335 *access |= i;
1336 }
1337}
1338
fd39ca9a 1339static void
1da177e4
LT		 1340set_deny(unsigned int *deny, unsigned long bmap) {
1341 int i;
1342
1343 *deny = 0;
1344 for (i = 0; i < 4; i++) {
1345 if (test_bit(i, &bmap))
1346 *deny |= i ;
1347 }
1348}
1349
1350static int
1351test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1352 unsigned int access, deny;
1353
1354 set_access(&access, stp->st_access_bmap);
1355 set_deny(&deny, stp->st_deny_bmap);
1356 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1357 return 0;
1358 return 1;
1359}
1360
1361/*
1362 * Called to check deny when READ with all zero stateid or
1363 * WRITE with all zero or all one stateid
1364 */
b37ad28b 1365static __be32
1da177e4
LT		 1366nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1367{
1368 struct inode *ino = current_fh->fh_dentry->d_inode;
1369 struct nfs4_file *fp;
1370 struct nfs4_stateid *stp;
b37ad28b 1371 __be32 ret;
1da177e4
LT		 1372
1373 dprintk("NFSD: nfs4_share_conflict\n");
1374
1375 fp = find_file(ino);
13cd2184
N		 1376 if (!fp)
1377 return nfs_ok;
b700949b 1378 ret = nfserr_locked;
1da177e4 1379 /* Search for conflicting share reservations */
13cd2184
N		 1380 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1381 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1382 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1383 goto out;
1da177e4 1384 }
13cd2184
N		 1385 ret = nfs_ok;
1386out:
1387 put_nfs4_file(fp);
1388 return ret;
1da177e4
LT		 1389}
1390
1391static inline void
1392nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1393{
1394 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1395 drop_file_write_access(filp);
1da177e4
LT		 1396 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1397 }
1398}
1399
1400/*
1401 * Recall a delegation
1402 */
1403static int
1404do_recall(void *__dp)
1405{
1406 struct nfs4_delegation *dp = __dp;
1407
47f9940c 1408 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1409 nfsd4_cb_recall(dp);
1410 return 0;
1411}
1412
1413/*
1414 * Spawn a thread to perform a recall on the delegation represented
1415 * by the lease (file_lock)
1416 *
1417 * Called from break_lease() with lock_kernel() held.
1418 * Note: we assume break_lease will only call this *once* for any given
1419 * lease.
1420 */
1421static
1422void nfsd_break_deleg_cb(struct file_lock *fl)
1423{
1424 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1425 struct task_struct *t;
1426
1427 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1428 if (!dp)
1429 return;
1430
1431 /* We're assuming the state code never drops its reference
1432 * without first removing the lease. Since we're in this lease
1433 * callback (and since the lease code is serialized by the kernel
1434 * lock) we know the server hasn't removed the lease yet, we know
1435 * it's safe to take a reference: */
1436 atomic_inc(&dp->dl_count);
cfdcad4d 1437 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1438
1439 spin_lock(&recall_lock);
1440 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1441 spin_unlock(&recall_lock);
1442
1443 /* only place dl_time is set. protected by lock_kernel*/
1444 dp->dl_time = get_seconds();
1445
0272e1fd
BF		 1446 /*
1447 * We don't want the locks code to timeout the lease for us;
1448 * we'll remove it ourself if the delegation isn't returned
1449 * in time.
1450 */
1451 fl->fl_break_time = 0;
1da177e4
LT		 1452
1453 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1454 if (IS_ERR(t)) {
1455 struct nfs4_client *clp = dp->dl_client;
1456
1457 printk(KERN_INFO "NFSD: Callback thread failed for "
1458 "for client (clientid %08x/%08x)\n",
1459 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1460 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1461 nfs4_put_delegation(dp);
1462 }
1463}
1464
1465/*
1466 * The file_lock is being reapd.
1467 *
1468 * Called by locks_free_lock() with lock_kernel() held.
1469 */
1470static
1471void nfsd_release_deleg_cb(struct file_lock *fl)
1472{
1473 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1474
1475 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1476
1477 if (!(fl->fl_flags & FL_LEASE) || !dp)
1478 return;
1479 dp->dl_flock = NULL;
1480}
1481
1482/*
1483 * Set the delegation file_lock back pointer.
1484 *
a9933cea 1485 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1486 */
1487static
1488void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1489{
1490 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1491
1492 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1493 if (!dp)
1494 return;
1495 dp->dl_flock = new;
1496}
1497
1498/*
a9933cea 1499 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1500 */
1501static
1502int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1503{
1504 struct nfs4_delegation *onlistd =
1505 (struct nfs4_delegation *)onlist->fl_owner;
1506 struct nfs4_delegation *tryd =
1507 (struct nfs4_delegation *)try->fl_owner;
1508
1509 if (onlist->fl_lmops != try->fl_lmops)
1510 return 0;
1511
1512 return onlistd->dl_client == tryd->dl_client;
1513}
1514
1515
1516static
1517int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1518{
1519 if (arg & F_UNLCK)
1520 return lease_modify(onlist, arg);
1521 else
1522 return -EAGAIN;
1523}
1524
fd39ca9a 1525static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1526 .fl_break = nfsd_break_deleg_cb,
1527 .fl_release_private = nfsd_release_deleg_cb,
1528 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1529 .fl_mylease = nfsd_same_client_deleg_cb,
1530 .fl_change = nfsd_change_deleg_cb,
1531};
1532
1533
b37ad28b 1534__be32
1da177e4
LT		 1535nfsd4_process_open1(struct nfsd4_open *open)
1536{
1da177e4
LT		 1537 clientid_t *clientid = &open->op_clientid;
1538 struct nfs4_client *clp = NULL;
1539 unsigned int strhashval;
1540 struct nfs4_stateowner *sop = NULL;
1541
1da177e4 1542 if (!check_name(open->op_owner))
0f442aa2 1543 return nfserr_inval;
1da177e4
LT		 1544
1545 if (STALE_CLIENTID(&open->op_clientid))
1546 return nfserr_stale_clientid;
1547
1548 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1549 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1550 open->op_stateowner = sop;
1551 if (!sop) {
1552 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1553 clp = find_confirmed_client(clientid);
1554 if (clp == NULL)
0f442aa2
BF		 1555 return nfserr_expired;
1556 goto renew;
1da177e4 1557 }
0f442aa2
BF		 1558 if (!sop->so_confirmed) {
1559 /* Replace unconfirmed owners without checking for replay. */
1560 clp = sop->so_client;
f044ff83 1561 release_openowner(sop);
0f442aa2
BF		 1562 open->op_stateowner = NULL;
1563 goto renew;
1564 }
1565 if (open->op_seqid == sop->so_seqid - 1) {
1566 if (sop->so_replay.rp_buflen)
a90b061c 1567 return nfserr_replay_me;
0f442aa2
BF		 1568 /* The original OPEN failed so spectacularly
1569 * that we don't even have replay data saved!
1570 * Therefore, we have no choice but to continue
1571 * processing this OPEN; presumably, we'll
1572 * fail again for the same reason.
1573 */
1574 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1575 goto renew;
1576 }
1577 if (open->op_seqid != sop->so_seqid)
1578 return nfserr_bad_seqid;
1da177e4 1579renew:
0f442aa2
BF		 1580 if (open->op_stateowner == NULL) {
1581 sop = alloc_init_open_stateowner(strhashval, clp, open);
1582 if (sop == NULL)
1583 return nfserr_resource;
1584 open->op_stateowner = sop;
1585 }
1586 list_del_init(&sop->so_close_lru);
1da177e4 1587 renew_client(sop->so_client);
0f442aa2 1588 return nfs_ok;
1da177e4
LT		 1589}
1590
b37ad28b 1591static inline __be32
4a6e43e6
N		 1592nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1593{
1594 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1595 return nfserr_openmode;
1596 else
1597 return nfs_ok;
1598}
1599
52f4fb43
N		 1600static struct nfs4_delegation *
1601find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1602{
1603 struct nfs4_delegation *dp;
1604
ea1da636 1605 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1606 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1607 return dp;
1608 }
1609 return NULL;
1610}
1611
b37ad28b 1612static __be32
567d9829
N		 1613nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1614 struct nfs4_delegation **dp)
1615{
1616 int flags;
b37ad28b 1617 __be32 status = nfserr_bad_stateid;
567d9829
N		 1618
1619 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1620 if (*dp == NULL)
c44c5eeb 1621 goto out;
567d9829
N		 1622 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1623 RD_STATE : WR_STATE;
1624 status = nfs4_check_delegmode(*dp, flags);
1625 if (status)
1626 *dp = NULL;
c44c5eeb
N		 1627out:
1628 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1629 return nfs_ok;
1630 if (status)
1631 return status;
1632 open->op_stateowner->so_confirmed = 1;
1633 return nfs_ok;
567d9829
N		 1634}
1635
b37ad28b 1636static __be32
1da177e4
LT		 1637nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1638{
1639 struct nfs4_stateid *local;
b37ad28b 1640 __be32 status = nfserr_share_denied;
1da177e4
LT		 1641 struct nfs4_stateowner *sop = open->op_stateowner;
1642
8beefa24 1643 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1644 /* ignore lock owners */
1645 if (local->st_stateowner->so_is_open_owner == 0)
1646 continue;
1647 /* remember if we have seen this open owner */
1648 if (local->st_stateowner == sop)
1649 *stpp = local;
1650 /* check for conflicting share reservations */
1651 if (!test_share(local, open))
1652 goto out;
1653 }
1654 status = 0;
1655out:
1656 return status;
1657}
1658
5ac049ac
N		 1659static inline struct nfs4_stateid *
1660nfs4_alloc_stateid(void)
1661{
1662 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1663}
1664
b37ad28b 1665static __be32
1da177e4 1666nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1667 struct nfs4_delegation *dp,
1da177e4
LT		 1668 struct svc_fh *cur_fh, int flags)
1669{
1670 struct nfs4_stateid *stp;
1da177e4 1671
5ac049ac 1672 stp = nfs4_alloc_stateid();
1da177e4
LT		 1673 if (stp == NULL)
1674 return nfserr_resource;
1675
567d9829
N		 1676 if (dp) {
1677 get_file(dp->dl_vfs_file);
1678 stp->st_vfs_file = dp->dl_vfs_file;
1679 } else {
b37ad28b 1680 __be32 status;
567d9829
N		 1681 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1682 &stp->st_vfs_file);
1683 if (status) {
1684 if (status == nfserr_dropit)
1685 status = nfserr_jukebox;
5ac049ac 1686 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1687 return status;
1688 }
1da177e4 1689 }
1da177e4
LT		 1690 *stpp = stp;
1691 return 0;
1692}
1693
b37ad28b 1694static inline __be32
1da177e4
LT		 1695nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1696 struct nfsd4_open *open)
1697{
1698 struct iattr iattr = {
1699 .ia_valid = ATTR_SIZE,
1700 .ia_size = 0,
1701 };
1702 if (!open->op_truncate)
1703 return 0;
1704 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1705 return nfserr_inval;
1da177e4
LT		 1706 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1707}
1708
b37ad28b 1709static __be32
1da177e4
LT		 1710nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1711{
1712 struct file *filp = stp->st_vfs_file;
7eaa36e2 1713 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1714 unsigned int share_access, new_writer;
b37ad28b 1715 __be32 status;
1da177e4
LT		 1716
1717 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1718 new_writer = (~share_access) & open->op_share_access
1719 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1720
6c26d08f 1721 if (new_writer) {
b37ad28b
AV		 1722 int err = get_write_access(inode);
1723 if (err)
1724 return nfserrno(err);
e518f056
BH		 1725 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1726 if (err)
1727 return nfserrno(err);
1728 file_take_write(filp);
6c26d08f 1729 }
1da177e4
LT		 1730 status = nfsd4_truncate(rqstp, cur_fh, open);
1731 if (status) {
6c26d08f
BF		 1732 if (new_writer)
1733 put_write_access(inode);
1da177e4
LT		 1734 return status;
1735 }
1736 /* remember the open */
6c26d08f 1737 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1738 __set_bit(open->op_share_access, &stp->st_access_bmap);
1739 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1740
1741 return nfs_ok;
1742}
1743
1744
1da177e4 1745static void
37515177 1746nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1747{
37515177
N		 1748 open->op_stateowner->so_confirmed = 1;
1749 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1750}
1751
1752/*
1753 * Attempt to hand out a delegation.
1754 */
1755static void
1756nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1757{
1758 struct nfs4_delegation *dp;
1759 struct nfs4_stateowner *sop = stp->st_stateowner;
1760 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1761 struct file_lock fl, *flp = &fl;
1762 int status, flag = 0;
1763
1764 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1765 open->op_recall = 0;
1766 switch (open->op_claim_type) {
1767 case NFS4_OPEN_CLAIM_PREVIOUS:
1768 if (!atomic_read(&cb->cb_set))
1769 open->op_recall = 1;
1770 flag = open->op_delegate_type;
1771 if (flag == NFS4_OPEN_DELEGATE_NONE)
1772 goto out;
1773 break;
1774 case NFS4_OPEN_CLAIM_NULL:
1775 /* Let's not give out any delegations till everyone's
1776 * had the chance to reclaim theirs.... */
af558e33 1777 if (locks_in_grace())
7b190fec
N		 1778 goto out;
1779 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1780 goto out;
1781 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1782 flag = NFS4_OPEN_DELEGATE_WRITE;
1783 else
1784 flag = NFS4_OPEN_DELEGATE_READ;
1785 break;
1786 default:
1787 goto out;
1788 }
1da177e4
LT		 1789
1790 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1791 if (dp == NULL) {
1792 flag = NFS4_OPEN_DELEGATE_NONE;
1793 goto out;
1794 }
1795 locks_init_lock(&fl);
1796 fl.fl_lmops = &nfsd_lease_mng_ops;
1797 fl.fl_flags = FL_LEASE;
9167f501 1798 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1799 fl.fl_end = OFFSET_MAX;
1800 fl.fl_owner = (fl_owner_t)dp;
1801 fl.fl_file = stp->st_vfs_file;
1802 fl.fl_pid = current->tgid;
1803
a9933cea 1804 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1805 * the lock_manager callbacks fl_mylease and fl_change are used
1806 */
9167f501 1807 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1808 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1809 unhash_delegation(dp);
1da177e4
LT		 1810 flag = NFS4_OPEN_DELEGATE_NONE;
1811 goto out;
1812 }
1813
1814 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1815
1816 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1817 dp->dl_stateid.si_boot,
1818 dp->dl_stateid.si_stateownerid,
1819 dp->dl_stateid.si_fileid,
1820 dp->dl_stateid.si_generation);
1821out:
7b190fec
N		 1822 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1823 && flag == NFS4_OPEN_DELEGATE_NONE
1824 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1825 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1826 open->op_delegate_type = flag;
1827}
1828
1829/*
1830 * called with nfs4_lock_state() held.
1831 */
b37ad28b 1832__be32
1da177e4
LT		 1833nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1834{
1835 struct nfs4_file *fp = NULL;
1836 struct inode *ino = current_fh->fh_dentry->d_inode;
1837 struct nfs4_stateid *stp = NULL;
567d9829 1838 struct nfs4_delegation *dp = NULL;
b37ad28b 1839 __be32 status;
1da177e4
LT		 1840
1841 status = nfserr_inval;
ba5a6a19
BF		 1842 if (!access_valid(open->op_share_access)
1843 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1844 goto out;
1845 /*
1846 * Lookup file; if found, lookup stateid and check open request,
1847 * and check for delegations in the process of being recalled.
1848 * If not found, create the nfs4_file struct
1849 */
1850 fp = find_file(ino);
1851 if (fp) {
1852 if ((status = nfs4_check_open(fp, open, &stp)))
1853 goto out;
c44c5eeb
N		 1854 status = nfs4_check_deleg(fp, open, &dp);
1855 if (status)
1856 goto out;
1da177e4 1857 } else {
c44c5eeb
N		 1858 status = nfserr_bad_stateid;
1859 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1860 goto out;
1da177e4
LT		 1861 status = nfserr_resource;
1862 fp = alloc_init_file(ino);
1863 if (fp == NULL)
1864 goto out;
1865 }
1866
1867 /*
1868 * OPEN the file, or upgrade an existing OPEN.
1869 * If truncate fails, the OPEN fails.
1870 */
1871 if (stp) {
1872 /* Stateid was found, this is an OPEN upgrade */
1873 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1874 if (status)
1875 goto out;
444c2c07 1876 update_stateid(&stp->st_stateid);
1da177e4
LT		 1877 } else {
1878 /* Stateid was not found, this is a new OPEN */
1879 int flags = 0;
9ecb6a08 1880 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1881 flags |= NFSD_MAY_READ;
1da177e4 1882 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1883 flags |= NFSD_MAY_WRITE;
567d9829
N		 1884 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1885 if (status)
1da177e4
LT		 1886 goto out;
1887 init_stateid(stp, fp, open);
1888 status = nfsd4_truncate(rqstp, current_fh, open);
1889 if (status) {
2283963f 1890 release_open_stateid(stp);
1da177e4
LT		 1891 goto out;
1892 }
1893 }
1894 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1895
1896 /*
1897 * Attempt to hand out a delegation. No error return, because the
1898 * OPEN succeeds even if we fail.
1899 */
1900 nfs4_open_delegation(current_fh, open, stp);
1901
1902 status = nfs_ok;
1903
1904 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1905 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1906 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1907out:
13cd2184
N		 1908 if (fp)
1909 put_nfs4_file(fp);
37515177
N		 1910 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1911 nfs4_set_claim_prev(open);
1da177e4
LT		 1912 /*
1913 * To finish the open response, we just need to set the rflags.
1914 */
1915 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1916 if (!open->op_stateowner->so_confirmed)
1917 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1918
1919 return status;
1920}
1921
b37ad28b 1922__be32
b591480b
BF		 1923nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1924 clientid_t *clid)
1da177e4
LT		 1925{
1926 struct nfs4_client *clp;
b37ad28b 1927 __be32 status;
1da177e4
LT		 1928
1929 nfs4_lock_state();
1930 dprintk("process_renew(%08x/%08x): starting\n",
1931 clid->cl_boot, clid->cl_id);
1932 status = nfserr_stale_clientid;
1933 if (STALE_CLIENTID(clid))
1934 goto out;
1935 clp = find_confirmed_client(clid);
1936 status = nfserr_expired;
1937 if (clp == NULL) {
1938 /* We assume the client took too long to RENEW. */
1939 dprintk("nfsd4_renew: clientid not found!\n");
1940 goto out;
1941 }
1942 renew_client(clp);
1943 status = nfserr_cb_path_down;
ea1da636 1944 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1945 && !atomic_read(&clp->cl_callback.cb_set))
1946 goto out;
1947 status = nfs_ok;
1948out:
1949 nfs4_unlock_state();
1950 return status;
1951}
1952
af558e33
BF		 1953struct lock_manager nfsd4_manager = {
1954};
1955
a76b4319 1956static void
af558e33 1957nfsd4_end_grace(void)
a76b4319
N		 1958{
1959 dprintk("NFSD: end of grace period\n");
c7b9a459 1960 nfsd4_recdir_purge_old();
af558e33 1961 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1962}
1963
fd39ca9a 1964static time_t
1da177e4
LT		 1965nfs4_laundromat(void)
1966{
1967 struct nfs4_client *clp;
1968 struct nfs4_stateowner *sop;
1969 struct nfs4_delegation *dp;
1970 struct list_head *pos, *next, reaplist;
1971 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1972 time_t t, clientid_val = NFSD_LEASE_TIME;
1973 time_t u, test_val = NFSD_LEASE_TIME;
1974
1975 nfs4_lock_state();
1976
1977 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1978 if (locks_in_grace())
1979 nfsd4_end_grace();
1da177e4
LT		 1980 list_for_each_safe(pos, next, &client_lru) {
1981 clp = list_entry(pos, struct nfs4_client, cl_lru);
1982 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1983 t = clp->cl_time - cutoff;
1984 if (clientid_val > t)
1985 clientid_val = t;
1986 break;
1987 }
1988 dprintk("NFSD: purging unused client (clientid %08x)\n",
1989 clp->cl_clientid.cl_id);
c7b9a459 1990 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1991 expire_client(clp);
1992 }
1993 INIT_LIST_HEAD(&reaplist);
1994 spin_lock(&recall_lock);
1995 list_for_each_safe(pos, next, &del_recall_lru) {
1996 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1997 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1998 u = dp->dl_time - cutoff;
1999 if (test_val > u)
2000 test_val = u;
2001 break;
2002 }
2003 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2004 dp, dp->dl_flock);
2005 list_move(&dp->dl_recall_lru, &reaplist);
2006 }
2007 spin_unlock(&recall_lock);
2008 list_for_each_safe(pos, next, &reaplist) {
2009 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2010 list_del_init(&dp->dl_recall_lru);
2011 unhash_delegation(dp);
2012 }
2013 test_val = NFSD_LEASE_TIME;
2014 list_for_each_safe(pos, next, &close_lru) {
2015 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2016 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2017 u = sop->so_time - cutoff;
2018 if (test_val > u)
2019 test_val = u;
2020 break;
2021 }
2022 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2023 sop->so_id);
f044ff83 2024 release_openowner(sop);
1da177e4
LT		 2025 }
2026 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2027 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2028 nfs4_unlock_state();
2029 return clientid_val;
2030}
2031
a254b246
HH		 2032static struct workqueue_struct *laundry_wq;
2033static void laundromat_main(struct work_struct *);
2034static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2035
2036static void
c4028958 2037laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2038{
2039 time_t t;
2040
2041 t = nfs4_laundromat();
2042 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2043 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2044}
2045
fd39ca9a 2046static struct nfs4_stateowner *
f8816512
N		 2047search_close_lru(u32 st_id, int flags)
2048{
1da177e4
LT		 2049 struct nfs4_stateowner *local = NULL;
2050
1da177e4
LT		 2051 if (flags & CLOSE_STATE) {
2052 list_for_each_entry(local, &close_lru, so_close_lru) {
2053 if (local->so_id == st_id)
2054 return local;
2055 }
2056 }
2057 return NULL;
2058}
2059
2060static inline int
2061nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2062{
7eaa36e2 2063 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2064}
2065
2066static int
2067STALE_STATEID(stateid_t *stateid)
2068{
2069 if (stateid->si_boot == boot_time)
2070 return 0;
849823c5 2071 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2072 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2073 stateid->si_generation);
2074 return 1;
2075}
2076
2077static inline int
2078access_permit_read(unsigned long access_bmap)
2079{
2080 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2081 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2082 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2083}
2084
2085static inline int
2086access_permit_write(unsigned long access_bmap)
2087{
2088 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2089 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2090}
2091
2092static
b37ad28b 2093__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2094{
b37ad28b 2095 __be32 status = nfserr_openmode;
1da177e4
LT		 2096
2097 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2098 goto out;
2099 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2100 goto out;
2101 status = nfs_ok;
2102out:
2103 return status;
2104}
2105
b37ad28b 2106static inline __be32
1da177e4
LT		 2107check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2108{
203a8c8e 2109 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2110 return nfs_ok;
af558e33 2111 else if (locks_in_grace()) {
1da177e4
LT		 2112 /* Answer in remaining cases depends on existance of
2113 * conflicting state; so we must wait out the grace period. */
2114 return nfserr_grace;
2115 } else if (flags & WR_STATE)
2116 return nfs4_share_conflict(current_fh,
2117 NFS4_SHARE_DENY_WRITE);
2118 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2119 return nfs4_share_conflict(current_fh,
2120 NFS4_SHARE_DENY_READ);
2121}
2122
2123/*
2124 * Allow READ/WRITE during grace period on recovered state only for files
2125 * that are not able to provide mandatory locking.
2126 */
2127static inline int
18f82731 2128grace_disallows_io(struct inode *inode)
1da177e4 2129{
203a8c8e 2130 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2131}
2132
0836f587
BF		 2133static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2134{
2135 /* If the client sends us a stateid from the future, it's buggy: */
2136 if (in->si_generation > ref->si_generation)
2137 return nfserr_bad_stateid;
2138 /*
2139 * The following, however, can happen. For example, if the
2140 * client sends an open and some IO at the same time, the open
2141 * may bump si_generation while the IO is still in flight.
2142 * Thanks to hard links and renames, the client never knows what
2143 * file an open will affect. So it could avoid that situation
2144 * only by serializing all opens and IO from the same open
2145 * owner. To recover from the old_stateid error, the client
2146 * will just have to retry the IO:
2147 */
2148 if (in->si_generation < ref->si_generation)
2149 return nfserr_old_stateid;
2150 return nfs_ok;
2151}
2152
3e633079
BF		 2153static int is_delegation_stateid(stateid_t *stateid)
2154{
2155 return stateid->si_fileid == 0;
2156}
2157
1da177e4
LT		 2158/*
2159* Checks for stateid operations
2160*/
b37ad28b 2161__be32
1da177e4
LT		 2162nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2163{
2164 struct nfs4_stateid *stp = NULL;
2165 struct nfs4_delegation *dp = NULL;
1da177e4 2166 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2167 __be32 status;
1da177e4 2168
1da177e4
LT		 2169 if (filpp)
2170 *filpp = NULL;
2171
18f82731 2172 if (grace_disallows_io(ino))
1da177e4
LT		 2173 return nfserr_grace;
2174
2175 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2176 return check_special_stateids(current_fh, stateid, flags);
2177
1da177e4
LT		 2178 status = nfserr_stale_stateid;
2179 if (STALE_STATEID(stateid))
2180 goto out;
2181
1da177e4 2182 status = nfserr_bad_stateid;
3e633079 2183 if (is_delegation_stateid(stateid)) {
a4455be0 2184 dp = find_delegation_stateid(ino, stateid);
819a8f53 2185 if (!dp)
1da177e4 2186 goto out;
fd03b099 2187 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2188 if (status)
2189 goto out;
dc9bf700
BF		 2190 status = nfs4_check_delegmode(dp, flags);
2191 if (status)
2192 goto out;
2193 renew_client(dp->dl_client);
dc9bf700
BF		 2194 if (filpp)
2195 *filpp = dp->dl_vfs_file;
1da177e4 2196 } else { /* open or lock stateid */
a4455be0 2197 stp = find_stateid(stateid, flags);
819a8f53 2198 if (!stp)
1da177e4 2199 goto out;
6150ef0d 2200 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2201 goto out;
2202 if (!stp->st_stateowner->so_confirmed)
2203 goto out;
fd03b099 2204 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2205 if (status)
2206 goto out;
a4455be0
BF		 2207 status = nfs4_check_openmode(stp, flags);
2208 if (status)
1da177e4
LT		 2209 goto out;
2210 renew_client(stp->st_stateowner->so_client);
2211 if (filpp)
2212 *filpp = stp->st_vfs_file;
1da177e4
LT		 2213 }
2214 status = nfs_ok;
2215out:
2216 return status;
2217}
2218
4c4cd222
N		 2219static inline int
2220setlkflg (int type)
2221{
2222 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2223 RD_STATE : WR_STATE;
2224}
1da177e4
LT		 2225
2226/*
2227 * Checks for sequence id mutating operations.
2228 */
b37ad28b 2229static __be32
4c4cd222 2230nfs4_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 2231{
1da177e4
LT		 2232 struct nfs4_stateid *stp;
2233 struct nfs4_stateowner *sop;
0836f587 2234 __be32 status;
1da177e4
LT		 2235
2236 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2237 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2238 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2239 stateid->si_generation);
3a4f98bb 2240
1da177e4
LT		 2241 *stpp = NULL;
2242 *sopp = NULL;
2243
1da177e4 2244 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2245 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2246 return nfserr_bad_stateid;
1da177e4
LT		 2247 }
2248
1da177e4 2249 if (STALE_STATEID(stateid))
3a4f98bb 2250 return nfserr_stale_stateid;
1da177e4
LT		 2251 /*
2252 * We return BAD_STATEID if filehandle doesn't match stateid,
2253 * the confirmed flag is incorrecly set, or the generation
2254 * number is incorrect.
1da177e4 2255 */
f8816512
N		 2256 stp = find_stateid(stateid, flags);
2257 if (stp == NULL) {
2258 /*
2259 * Also, we should make sure this isn't just the result of
2260 * a replayed close:
2261 */
2262 sop = search_close_lru(stateid->si_stateownerid, flags);
2263 if (sop == NULL)
2264 return nfserr_bad_stateid;
2265 *sopp = sop;
2266 goto check_replay;
2267 }
1da177e4 2268
39325bd0
BF		 2269 *stpp = stp;
2270 *sopp = sop = stp->st_stateowner;
2271
4c4cd222 2272 if (lock) {
4c4cd222 2273 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2274 struct nfs4_client *clp = sop->so_client;
4c4cd222 2275 int lkflg = 0;
b37ad28b 2276 __be32 status;
4c4cd222
N		 2277
2278 lkflg = setlkflg(lock->lk_type);
2279
2280 if (lock->lk_is_new) {
599e0a22
BF		 2281 if (!sop->so_is_open_owner)
2282 return nfserr_bad_stateid;
2283 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2284 return nfserr_bad_stateid;
599e0a22
BF		 2285 /* stp is the open stateid */
2286 status = nfs4_check_openmode(stp, lkflg);
2287 if (status)
2288 return status;
2289 } else {
2290 /* stp is the lock stateid */
2291 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2292 if (status)
2293 return status;
4c4cd222 2294 }
1da177e4
LT		 2295 }
2296
f3362737 2297 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2298 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2299 return nfserr_bad_stateid;
1da177e4
LT		 2300 }
2301
1da177e4
LT		 2302 /*
2303 * We now validate the seqid and stateid generation numbers.
2304 * For the moment, we ignore the possibility of
2305 * generation number wraparound.
2306 */
bd9aac52 2307 if (seqid != sop->so_seqid)
1da177e4
LT		 2308 goto check_replay;
2309
3a4f98bb 2310 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2311 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2312 " unconfirmed stateowner!\n");
2313 return nfserr_bad_stateid;
1da177e4 2314 }
3a4f98bb 2315 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2316 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2317 " confirmed yet!\n");
2318 return nfserr_bad_stateid;
1da177e4 2319 }
0836f587
BF		 2320 status = check_stateid_generation(stateid, &stp->st_stateid);
2321 if (status)
2322 return status;
52fd004e 2323 renew_client(sop->so_client);
3a4f98bb 2324 return nfs_ok;
1da177e4 2325
1da177e4 2326check_replay:
bd9aac52 2327 if (seqid == sop->so_seqid - 1) {
849823c5 2328 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2329 /* indicate replay to calling function */
a90b061c 2330 return nfserr_replay_me;
1da177e4 2331 }
2fdada03 2332 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2333 sop->so_seqid, seqid);
2334 *sopp = NULL;
2335 return nfserr_bad_seqid;
1da177e4
LT		 2336}
2337
b37ad28b 2338__be32
ca364317 2339nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2340 struct nfsd4_open_confirm *oc)
1da177e4 2341{
b37ad28b 2342 __be32 status;
1da177e4
LT		 2343 struct nfs4_stateowner *sop;
2344 struct nfs4_stateid *stp;
2345
2346 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2347 (int)cstate->current_fh.fh_dentry->d_name.len,
2348 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2349
ca364317 2350 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2351 if (status)
2352 return status;
1da177e4
LT		 2353
2354 nfs4_lock_state();
2355
ca364317
BF		 2356 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2357 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2358 CONFIRM | OPEN_STATE,
1da177e4
LT		 2359 &oc->oc_stateowner, &stp, NULL)))
2360 goto out;
2361
2362 sop = oc->oc_stateowner;
2363 sop->so_confirmed = 1;
2364 update_stateid(&stp->st_stateid);
2365 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2366 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2367 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2368 stp->st_stateid.si_boot,
2369 stp->st_stateid.si_stateownerid,
2370 stp->st_stateid.si_fileid,
2371 stp->st_stateid.si_generation);
c7b9a459
N		 2372
2373 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2374out:
f2327d9a 2375 if (oc->oc_stateowner) {
1da177e4 2376 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2377 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2378 }
1da177e4
LT		 2379 nfs4_unlock_state();
2380 return status;
2381}
2382
2383
2384/*
2385 * unset all bits in union bitmap (bmap) that
2386 * do not exist in share (from successful OPEN_DOWNGRADE)
2387 */
2388static void
2389reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2390{
2391 int i;
2392 for (i = 1; i < 4; i++) {
2393 if ((i & access) != i)
2394 __clear_bit(i, bmap);
2395 }
2396}
2397
2398static void
2399reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2400{
2401 int i;
2402 for (i = 0; i < 4; i++) {
2403 if ((i & deny) != i)
2404 __clear_bit(i, bmap);
2405 }
2406}
2407
b37ad28b 2408__be32
ca364317
BF		 2409nfsd4_open_downgrade(struct svc_rqst *rqstp,
2410 struct nfsd4_compound_state *cstate,
a4f1706a 2411 struct nfsd4_open_downgrade *od)
1da177e4 2412{
b37ad28b 2413 __be32 status;
1da177e4
LT		 2414 struct nfs4_stateid *stp;
2415 unsigned int share_access;
2416
2417 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2418 (int)cstate->current_fh.fh_dentry->d_name.len,
2419 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2420
ba5a6a19
BF		 2421 if (!access_valid(od->od_share_access)
2422 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2423 return nfserr_inval;
2424
2425 nfs4_lock_state();
ca364317
BF		 2426 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2427 od->od_seqid,
1da177e4 2428 &od->od_stateid,
f3362737 2429 OPEN_STATE,
1da177e4
LT		 2430 &od->od_stateowner, &stp, NULL)))
2431 goto out;
2432
2433 status = nfserr_inval;
2434 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2435 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2436 stp->st_access_bmap, od->od_share_access);
2437 goto out;
2438 }
2439 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2440 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2441 stp->st_deny_bmap, od->od_share_deny);
2442 goto out;
2443 }
2444 set_access(&share_access, stp->st_access_bmap);
2445 nfs4_file_downgrade(stp->st_vfs_file,
2446 share_access & ~od->od_share_access);
2447
2448 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2449 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2450
2451 update_stateid(&stp->st_stateid);
2452 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2453 status = nfs_ok;
2454out:
f2327d9a 2455 if (od->od_stateowner) {
1da177e4 2456 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2457 cstate->replay_owner = od->od_stateowner;
f2327d9a 2458 }
1da177e4
LT		 2459 nfs4_unlock_state();
2460 return status;
2461}
2462
2463/*
2464 * nfs4_unlock_state() called after encode
2465 */
b37ad28b 2466__be32
ca364317 2467nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2468 struct nfsd4_close *close)
1da177e4 2469{
b37ad28b 2470 __be32 status;
1da177e4
LT		 2471 struct nfs4_stateid *stp;
2472
2473 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2474 (int)cstate->current_fh.fh_dentry->d_name.len,
2475 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2476
2477 nfs4_lock_state();
2478 /* check close_lru for replay */
ca364317
BF		 2479 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2480 close->cl_seqid,
1da177e4 2481 &close->cl_stateid,
f3362737 2482 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2483 &close->cl_stateowner, &stp, NULL)))
2484 goto out;
1da177e4
LT		 2485 status = nfs_ok;
2486 update_stateid(&stp->st_stateid);
2487 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2488
04ef5954 2489 /* release_stateid() calls nfsd_close() if needed */
2283963f 2490 release_open_stateid(stp);
04ef5954
BF		 2491
2492 /* place unused nfs4_stateowners on so_close_lru list to be
2493 * released by the laundromat service after the lease period
2494 * to enable us to handle CLOSE replay
2495 */
2496 if (list_empty(&close->cl_stateowner->so_stateids))
2497 move_to_close_lru(close->cl_stateowner);
1da177e4 2498out:
f2327d9a 2499 if (close->cl_stateowner) {
1da177e4 2500 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2501 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2502 }
1da177e4
LT		 2503 nfs4_unlock_state();
2504 return status;
2505}
2506
b37ad28b 2507__be32
ca364317
BF		 2508nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2509 struct nfsd4_delegreturn *dr)
1da177e4 2510{
203a8c8e
BF		 2511 struct nfs4_delegation *dp;
2512 stateid_t *stateid = &dr->dr_stateid;
2513 struct inode *inode;
b37ad28b 2514 __be32 status;
1da177e4 2515
ca364317 2516 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2517 return status;
2518 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2519
2520 nfs4_lock_state();
203a8c8e
BF		 2521 status = nfserr_bad_stateid;
2522 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2523 goto out;
2524 status = nfserr_stale_stateid;
2525 if (STALE_STATEID(stateid))
2526 goto out;
7e0f7cf5 2527 status = nfserr_bad_stateid;
203a8c8e
BF		 2528 if (!is_delegation_stateid(stateid))
2529 goto out;
203a8c8e
BF		 2530 dp = find_delegation_stateid(inode, stateid);
2531 if (!dp)
2532 goto out;
2533 status = check_stateid_generation(stateid, &dp->dl_stateid);
2534 if (status)
2535 goto out;
2536 renew_client(dp->dl_client);
2537
2538 unhash_delegation(dp);
1da177e4 2539out:
203a8c8e
BF		 2540 nfs4_unlock_state();
2541
1da177e4
LT		 2542 return status;
2543}
2544
2545
2546/*
2547 * Lock owner state (byte-range locks)
2548 */
2549#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2550#define LOCK_HASH_BITS 8
2551#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2552#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2553
87df4de8
BH		 2554static inline u64
2555end_offset(u64 start, u64 len)
2556{
2557 u64 end;
2558
2559 end = start + len;
2560 return end >= start ? end: NFS4_MAX_UINT64;
2561}
2562
2563/* last octet in a range */
2564static inline u64
2565last_byte_offset(u64 start, u64 len)
2566{
2567 u64 end;
2568
2569 BUG_ON(!len);
2570 end = start + len;
2571 return end > start ? end - 1: NFS4_MAX_UINT64;
2572}
2573
1da177e4
LT		 2574#define lockownerid_hashval(id) \
2575 ((id) & LOCK_HASH_MASK)
2576
2577static inline unsigned int
2578lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2579 struct xdr_netobj *ownername)
2580{
2581 return (file_hashval(inode) + cl_id
2582 + opaque_hashval(ownername->data, ownername->len))
2583 & LOCK_HASH_MASK;
2584}
2585
2586static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2587static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2588static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2589
fd39ca9a 2590static struct nfs4_stateid *
1da177e4
LT		 2591find_stateid(stateid_t *stid, int flags)
2592{
9346eff0 2593 struct nfs4_stateid *local;
1da177e4
LT		 2594 u32 st_id = stid->si_stateownerid;
2595 u32 f_id = stid->si_fileid;
2596 unsigned int hashval;
2597
2598 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2599 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2600 hashval = stateid_hashval(st_id, f_id);
2601 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2602 if ((local->st_stateid.si_stateownerid == st_id) &&
2603 (local->st_stateid.si_fileid == f_id))
2604 return local;
2605 }
2606 }
9346eff0
KK		 2607
2608 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2609 hashval = stateid_hashval(st_id, f_id);
2610 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2611 if ((local->st_stateid.si_stateownerid == st_id) &&
2612 (local->st_stateid.si_fileid == f_id))
2613 return local;
2614 }
849823c5 2615 }
1da177e4
LT		 2616 return NULL;
2617}
2618
2619static struct nfs4_delegation *
2620find_delegation_stateid(struct inode *ino, stateid_t *stid)
2621{
13cd2184
N		 2622 struct nfs4_file *fp;
2623 struct nfs4_delegation *dl;
1da177e4
LT		 2624
2625 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2626 stid->si_boot, stid->si_stateownerid,
2627 stid->si_fileid, stid->si_generation);
2628
1da177e4 2629 fp = find_file(ino);
13cd2184
N		 2630 if (!fp)
2631 return NULL;
2632 dl = find_delegation_file(fp, stid);
2633 put_nfs4_file(fp);
2634 return dl;
1da177e4
LT		 2635}
2636
2637/*
2638 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2639 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2640 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2641 * locking, this prevents us from being completely protocol-compliant. The
2642 * real solution to this problem is to start using unsigned file offsets in
2643 * the VFS, but this is a very deep change!
2644 */
2645static inline void
2646nfs4_transform_lock_offset(struct file_lock *lock)
2647{
2648 if (lock->fl_start < 0)
2649 lock->fl_start = OFFSET_MAX;
2650 if (lock->fl_end < 0)
2651 lock->fl_end = OFFSET_MAX;
2652}
2653
d5b9026a
N		 2654/* Hack!: For now, we're defining this just so we can use a pointer to it
2655 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2656static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2657};
1da177e4
LT		 2658
2659static inline void
2660nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2661{
d5b9026a
N		 2662 struct nfs4_stateowner *sop;
2663 unsigned int hval;
1da177e4 2664
d5b9026a
N		 2665 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2666 sop = (struct nfs4_stateowner *) fl->fl_owner;
2667 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2668 kref_get(&sop->so_ref);
2669 deny->ld_sop = sop;
2670 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2671 } else {
2672 deny->ld_sop = NULL;
2673 deny->ld_clientid.cl_boot = 0;
2674 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2675 }
2676 deny->ld_start = fl->fl_start;
87df4de8
BH		 2677 deny->ld_length = NFS4_MAX_UINT64;
2678 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2679 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2680 deny->ld_type = NFS4_READ_LT;
2681 if (fl->fl_type != F_RDLCK)
2682 deny->ld_type = NFS4_WRITE_LT;
2683}
2684
1da177e4
LT		 2685static struct nfs4_stateowner *
2686find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2687 struct xdr_netobj *owner)
2688{
2689 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2690 struct nfs4_stateowner *op;
2691
2692 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2693 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2694 return op;
2695 }
2696 return NULL;
2697}
2698
2699/*
2700 * Alloc a lock owner structure.
2701 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2702 * occured.
2703 *
2704 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2705 */
2706
2707static struct nfs4_stateowner *
2708alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2709 struct nfs4_stateowner *sop;
2710 struct nfs4_replay *rp;
2711 unsigned int idhashval;
2712
2713 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2714 return NULL;
2715 idhashval = lockownerid_hashval(current_ownerid);
2716 INIT_LIST_HEAD(&sop->so_idhash);
2717 INIT_LIST_HEAD(&sop->so_strhash);
2718 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2719 INIT_LIST_HEAD(&sop->so_stateids);
2720 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2721 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2722 sop->so_time = 0;
2723 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2724 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2725 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2726 sop->so_is_open_owner = 0;
2727 sop->so_id = current_ownerid++;
2728 sop->so_client = clp;
b59e3c0e
NB		 2729 /* It is the openowner seqid that will be incremented in encode in the
2730 * case of new lockowners; so increment the lock seqid manually: */
2731 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2732 sop->so_confirmed = 1;
2733 rp = &sop->so_replay;
de1ae286 2734 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2735 rp->rp_buflen = 0;
2736 rp->rp_buf = rp->rp_ibuf;
2737 return sop;
2738}
2739
fd39ca9a 2740static struct nfs4_stateid *
1da177e4
LT		 2741alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2742{
2743 struct nfs4_stateid *stp;
2744 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2745
5ac049ac
N		 2746 stp = nfs4_alloc_stateid();
2747 if (stp == NULL)
1da177e4
LT		 2748 goto out;
2749 INIT_LIST_HEAD(&stp->st_hash);
2750 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2751 INIT_LIST_HEAD(&stp->st_perstateowner);
2752 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2753 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2754 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2755 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2756 stp->st_stateowner = sop;
13cd2184 2757 get_nfs4_file(fp);
1da177e4
LT		 2758 stp->st_file = fp;
2759 stp->st_stateid.si_boot = boot_time;
2760 stp->st_stateid.si_stateownerid = sop->so_id;
2761 stp->st_stateid.si_fileid = fp->fi_id;
2762 stp->st_stateid.si_generation = 0;
2763 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2764 stp->st_access_bmap = open_stp->st_access_bmap;
2765 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2766 stp->st_openstp = open_stp;
1da177e4
LT		 2767
2768out:
2769 return stp;
2770}
2771
fd39ca9a 2772static int
1da177e4
LT		 2773check_lock_length(u64 offset, u64 length)
2774{
87df4de8 2775 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2776 LOFF_OVERFLOW(offset, length)));
2777}
2778
2779/*
2780 * LOCK operation
2781 */
b37ad28b 2782__be32
ca364317 2783nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2784 struct nfsd4_lock *lock)
1da177e4 2785{
3e9e3dbe 2786 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2787 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2788 struct nfs4_stateid *lock_stp;
2789 struct file *filp;
2790 struct file_lock file_lock;
8dc7c311 2791 struct file_lock conflock;
b37ad28b 2792 __be32 status = 0;
1da177e4 2793 unsigned int strhashval;
150b3934 2794 unsigned int cmd;
b8dd7b9a 2795 int err;
1da177e4
LT		 2796
2797 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2798 (long long) lock->lk_offset,
2799 (long long) lock->lk_length);
2800
1da177e4
LT		 2801 if (check_lock_length(lock->lk_offset, lock->lk_length))
2802 return nfserr_inval;
2803
ca364317 2804 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2805 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2806 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2807 return status;
2808 }
2809
1da177e4
LT		 2810 nfs4_lock_state();
2811
2812 if (lock->lk_is_new) {
893f8770
N		 2813 /*
2814 * Client indicates that this is a new lockowner.
2815 * Use open owner and open stateid to create lock owner and
2816 * lock stateid.
2817 */
1da177e4
LT		 2818 struct nfs4_stateid *open_stp = NULL;
2819 struct nfs4_file *fp;
2820
2821 status = nfserr_stale_clientid;
849823c5 2822 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2823 goto out;
1da177e4 2824
1da177e4 2825 /* validate and update open stateid and open seqid */
ca364317 2826 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2827 lock->lk_new_open_seqid,
2828 &lock->lk_new_open_stateid,
f3362737 2829 OPEN_STATE,
3a65588a 2830 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2831 lock);
37515177 2832 if (status)
1da177e4 2833 goto out;
3a65588a 2834 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2835 /* create lockowner and lock stateid */
2836 fp = open_stp->st_file;
2837 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2838 open_sop->so_client->cl_clientid.cl_id,
2839 &lock->v.new.owner);
3e9e3dbe
N		 2840 /* XXX: Do we need to check for duplicate stateowners on
2841 * the same file, or should they just be allowed (and
2842 * create new stateids)? */
1da177e4 2843 status = nfserr_resource;
b59e3c0e
NB		 2844 lock_sop = alloc_init_lock_stateowner(strhashval,
2845 open_sop->so_client, open_stp, lock);
2846 if (lock_sop == NULL)
1da177e4 2847 goto out;
b59e3c0e 2848 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2849 if (lock_stp == NULL)
1da177e4 2850 goto out;
1da177e4
LT		 2851 } else {
2852 /* lock (lock owner + lock stateid) already exists */
ca364317 2853 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2854 lock->lk_old_lock_seqid,
2855 &lock->lk_old_lock_stateid,
f3362737 2856 LOCK_STATE,
3a65588a 2857 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2858 if (status)
2859 goto out;
3a65588a 2860 lock_sop = lock->lk_replay_owner;
1da177e4 2861 }
3a65588a 2862 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2863 filp = lock_stp->st_vfs_file;
2864
0dd395dc 2865 status = nfserr_grace;
af558e33 2866 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2867 goto out;
2868 status = nfserr_no_grace;
af558e33 2869 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2870 goto out;
2871
1da177e4
LT		 2872 locks_init_lock(&file_lock);
2873 switch (lock->lk_type) {
2874 case NFS4_READ_LT:
2875 case NFS4_READW_LT:
2876 file_lock.fl_type = F_RDLCK;
150b3934 2877 cmd = F_SETLK;
1da177e4
LT		 2878 break;
2879 case NFS4_WRITE_LT:
2880 case NFS4_WRITEW_LT:
2881 file_lock.fl_type = F_WRLCK;
150b3934 2882 cmd = F_SETLK;
1da177e4
LT		 2883 break;
2884 default:
2885 status = nfserr_inval;
2886 goto out;
2887 }
b59e3c0e 2888 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2889 file_lock.fl_pid = current->tgid;
2890 file_lock.fl_file = filp;
2891 file_lock.fl_flags = FL_POSIX;
d5b9026a 2892 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2893
2894 file_lock.fl_start = lock->lk_offset;
87df4de8 2895 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 2896 nfs4_transform_lock_offset(&file_lock);
2897
2898 /*
2899 * Try to lock the file in the VFS.
2900 * Note: locks.c uses the BKL to protect the inode's lock list.
2901 */
2902
fd85b817 2903 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2904 switch (-err) {
1da177e4
LT		 2905 case 0: /* success! */
2906 update_stateid(&lock_stp->st_stateid);
2907 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2908 sizeof(stateid_t));
b8dd7b9a 2909 status = 0;
eb76b3fd
AA		 2910 break;
2911 case (EAGAIN): /* conflock holds conflicting lock */
2912 status = nfserr_denied;
2913 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2914 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2915 break;
1da177e4
LT		 2916 case (EDEADLK):
2917 status = nfserr_deadlock;
eb76b3fd 2918 break;
1da177e4 2919 default:
fd85b817 2920 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2921 status = nfserr_resource;
2922 break;
1da177e4 2923 }
1da177e4 2924out:
8a280510 2925 if (status && lock->lk_is_new && lock_sop)
f044ff83 2926 release_lockowner(lock_sop);
3a65588a
BF		 2927 if (lock->lk_replay_owner) {
2928 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2929 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2930 }
1da177e4
LT		 2931 nfs4_unlock_state();
2932 return status;
2933}
2934
55ef1274
BF		 2935/*
2936 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2937 * so we do a temporary open here just to get an open file to pass to
2938 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2939 * inode operation.)
2940 */
2941static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2942{
2943 struct file *file;
2944 int err;
2945
2946 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2947 if (err)
2948 return err;
2949 err = vfs_test_lock(file, lock);
2950 nfsd_close(file);
2951 return err;
2952}
2953
1da177e4
LT		 2954/*
2955 * LOCKT operation
2956 */
b37ad28b 2957__be32
ca364317
BF		 2958nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2959 struct nfsd4_lockt *lockt)
1da177e4
LT		 2960{
2961 struct inode *inode;
1da177e4 2962 struct file_lock file_lock;
fd85b817 2963 int error;
b37ad28b 2964 __be32 status;
1da177e4 2965
af558e33 2966 if (locks_in_grace())
1da177e4
LT		 2967 return nfserr_grace;
2968
2969 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2970 return nfserr_inval;
2971
2972 lockt->lt_stateowner = NULL;
2973 nfs4_lock_state();
2974
2975 status = nfserr_stale_clientid;
849823c5 2976 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2977 goto out;
1da177e4 2978
ca364317 2979 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2980 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2981 if (status == nfserr_symlink)
2982 status = nfserr_inval;
2983 goto out;
2984 }
2985
ca364317 2986 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2987 locks_init_lock(&file_lock);
2988 switch (lockt->lt_type) {
2989 case NFS4_READ_LT:
2990 case NFS4_READW_LT:
2991 file_lock.fl_type = F_RDLCK;
2992 break;
2993 case NFS4_WRITE_LT:
2994 case NFS4_WRITEW_LT:
2995 file_lock.fl_type = F_WRLCK;
2996 break;
2997 default:
2fdada03 2998 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2999 status = nfserr_inval;
3000 goto out;
3001 }
3002
3003 lockt->lt_stateowner = find_lockstateowner_str(inode,
3004 &lockt->lt_clientid, &lockt->lt_owner);
3005 if (lockt->lt_stateowner)
3006 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3007 file_lock.fl_pid = current->tgid;
3008 file_lock.fl_flags = FL_POSIX;
3009
3010 file_lock.fl_start = lockt->lt_offset;
87df4de8 3011 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3012
3013 nfs4_transform_lock_offset(&file_lock);
3014
1da177e4 3015 status = nfs_ok;
55ef1274 3016 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3017 if (error) {
3018 status = nfserrno(error);
3019 goto out;
3020 }
9d6a8c5c 3021 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3022 status = nfserr_denied;
9d6a8c5c 3023 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3024 }
3025out:
3026 nfs4_unlock_state();
3027 return status;
3028}
3029
b37ad28b 3030__be32
ca364317 3031nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3032 struct nfsd4_locku *locku)
1da177e4
LT		 3033{
3034 struct nfs4_stateid *stp;
3035 struct file *filp = NULL;
3036 struct file_lock file_lock;
b37ad28b 3037 __be32 status;
b8dd7b9a 3038 int err;
1da177e4
LT		 3039
3040 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3041 (long long) locku->lu_offset,
3042 (long long) locku->lu_length);
3043
3044 if (check_lock_length(locku->lu_offset, locku->lu_length))
3045 return nfserr_inval;
3046
3047 nfs4_lock_state();
3048
ca364317 3049 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3050 locku->lu_seqid,
3051 &locku->lu_stateid,
f3362737 3052 LOCK_STATE,
1da177e4
LT		 3053 &locku->lu_stateowner, &stp, NULL)))
3054 goto out;
3055
3056 filp = stp->st_vfs_file;
3057 BUG_ON(!filp);
3058 locks_init_lock(&file_lock);
3059 file_lock.fl_type = F_UNLCK;
3060 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3061 file_lock.fl_pid = current->tgid;
3062 file_lock.fl_file = filp;
3063 file_lock.fl_flags = FL_POSIX;
d5b9026a 3064 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3065 file_lock.fl_start = locku->lu_offset;
3066
87df4de8 3067 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3068 nfs4_transform_lock_offset(&file_lock);
3069
3070 /*
3071 * Try to unlock the file in the VFS.
3072 */
fd85b817 3073 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3074 if (err) {
fd85b817 3075 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3076 goto out_nfserr;
3077 }
3078 /*
3079 * OK, unlock succeeded; the only thing left to do is update the stateid.
3080 */
3081 update_stateid(&stp->st_stateid);
3082 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3083
3084out:
f2327d9a 3085 if (locku->lu_stateowner) {
1da177e4 3086 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3087 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3088 }
1da177e4
LT		 3089 nfs4_unlock_state();
3090 return status;
3091
3092out_nfserr:
b8dd7b9a 3093 status = nfserrno(err);
1da177e4
LT		 3094 goto out;
3095}
3096
3097/*
3098 * returns
3099 * 1: locks held by lockowner
3100 * 0: no locks held by lockowner
3101 */
3102static int
3103check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3104{
3105 struct file_lock **flpp;
7eaa36e2 3106 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3107 int status = 0;
3108
3109 lock_kernel();
3110 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3111 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3112 status = 1;
3113 goto out;
796dadfd 3114 }
1da177e4
LT		 3115 }
3116out:
3117 unlock_kernel();
3118 return status;
3119}
3120
b37ad28b 3121__be32
b591480b
BF		 3122nfsd4_release_lockowner(struct svc_rqst *rqstp,
3123 struct nfsd4_compound_state *cstate,
3124 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3125{
3126 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3127 struct nfs4_stateowner *sop;
3128 struct nfs4_stateid *stp;
1da177e4 3129 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3130 struct list_head matches;
3131 int i;
b37ad28b 3132 __be32 status;
1da177e4
LT		 3133
3134 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3135 clid->cl_boot, clid->cl_id);
3136
3137 /* XXX check for lease expiration */
3138
3139 status = nfserr_stale_clientid;
849823c5 3140 if (STALE_CLIENTID(clid))
1da177e4 3141 return status;
1da177e4
LT		 3142
3143 nfs4_lock_state();
3144
3e9e3dbe
N		 3145 status = nfserr_locks_held;
3146 /* XXX: we're doing a linear search through all the lockowners.
3147 * Yipes! For now we'll just hope clients aren't really using
3148 * release_lockowner much, but eventually we have to fix these
3149 * data structures. */
3150 INIT_LIST_HEAD(&matches);
3151 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3152 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3153 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3154 continue;
3155 list_for_each_entry(stp, &sop->so_stateids,
3156 st_perstateowner) {
3157 if (check_for_locks(stp->st_vfs_file, sop))
3158 goto out;
3159 /* Note: so_perclient unused for lockowners,
3160 * so it's OK to fool with here. */
3161 list_add(&sop->so_perclient, &matches);
3162 }
1da177e4 3163 }
3e9e3dbe
N		 3164 }
3165 /* Clients probably won't expect us to return with some (but not all)
3166 * of the lockowner state released; so don't release any until all
3167 * have been checked. */
3168 status = nfs_ok;
0fa822e4
N		 3169 while (!list_empty(&matches)) {
3170 sop = list_entry(matches.next, struct nfs4_stateowner,
3171 so_perclient);
3172 /* unhash_stateowner deletes so_perclient only
3173 * for openowners. */
3174 list_del(&sop->so_perclient);
f044ff83 3175 release_lockowner(sop);
1da177e4
LT		 3176 }
3177out:
3178 nfs4_unlock_state();
3179 return status;
3180}
3181
3182static inline struct nfs4_client_reclaim *
a55370a3 3183alloc_reclaim(void)
1da177e4 3184{
a55370a3 3185 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3186}
3187
c7b9a459
N		 3188int
3189nfs4_has_reclaimed_state(const char *name)
3190{
3191 unsigned int strhashval = clientstr_hashval(name);
3192 struct nfs4_client *clp;
3193
3194 clp = find_confirmed_client_by_str(name, strhashval);
3195 return clp ? 1 : 0;
3196}
3197
1da177e4
LT		 3198/*
3199 * failure => all reset bets are off, nfserr_no_grace...
3200 */
190e4fbf
N		 3201int
3202nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3203{
3204 unsigned int strhashval;
3205 struct nfs4_client_reclaim *crp = NULL;
3206
a55370a3
N		 3207 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3208 crp = alloc_reclaim();
1da177e4
LT		 3209 if (!crp)
3210 return 0;
a55370a3 3211 strhashval = clientstr_hashval(name);
1da177e4
LT		 3212 INIT_LIST_HEAD(&crp->cr_strhash);
3213 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3214 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3215 reclaim_str_hashtbl_size++;
3216 return 1;
3217}
3218
3219static void
3220nfs4_release_reclaim(void)
3221{
3222 struct nfs4_client_reclaim *crp = NULL;
3223 int i;
3224
1da177e4
LT		 3225 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3226 while (!list_empty(&reclaim_str_hashtbl[i])) {
3227 crp = list_entry(reclaim_str_hashtbl[i].next,
3228 struct nfs4_client_reclaim, cr_strhash);
3229 list_del(&crp->cr_strhash);
1da177e4
LT		 3230 kfree(crp);
3231 reclaim_str_hashtbl_size--;
3232 }
3233 }
3234 BUG_ON(reclaim_str_hashtbl_size);
3235}
3236
3237/*
3238 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3239static struct nfs4_client_reclaim *
1da177e4
LT		 3240nfs4_find_reclaim_client(clientid_t *clid)
3241{
3242 unsigned int strhashval;
3243 struct nfs4_client *clp;
3244 struct nfs4_client_reclaim *crp = NULL;
3245
3246
3247 /* find clientid in conf_id_hashtbl */
3248 clp = find_confirmed_client(clid);
3249 if (clp == NULL)
3250 return NULL;
3251
a55370a3
N		 3252 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3253 clp->cl_name.len, clp->cl_name.data,
3254 clp->cl_recdir);
1da177e4
LT		 3255
3256 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3257 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3258 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3259 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3260 return crp;
3261 }
3262 }
3263 return NULL;
3264}
3265
3266/*
3267* Called from OPEN. Look for clientid in reclaim list.
3268*/
b37ad28b 3269__be32
1da177e4
LT		 3270nfs4_check_open_reclaim(clientid_t *clid)
3271{
dfc83565 3272 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3273}
3274
ac4d8ff2 3275/* initialization to perform at module load time: */
1da177e4 3276
e8ff2a84 3277int
ac4d8ff2 3278nfs4_state_init(void)
1da177e4 3279{
e8ff2a84 3280 int i, status;
1da177e4 3281
e8ff2a84
BF		 3282 status = nfsd4_init_slabs();
3283 if (status)
3284 return status;
1da177e4
LT		 3285 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3286 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3287 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3288 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3289 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3290 }
5282fd72
ME		 3291 for (i = 0; i < SESSION_HASH_SIZE; i++)
3292 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3293 for (i = 0; i < FILE_HASH_SIZE; i++) {
3294 INIT_LIST_HEAD(&file_hashtbl[i]);
3295 }
3296 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3297 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3298 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3299 }
3300 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3301 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3302 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3303 }
3304 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3305 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3306 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3307 }
1da177e4 3308 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3309 INIT_LIST_HEAD(&close_lru);
3310 INIT_LIST_HEAD(&client_lru);
3311 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3312 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3313 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3314 reclaim_str_hashtbl_size = 0;
e8ff2a84 3315 return 0;
ac4d8ff2
N		 3316}
3317
190e4fbf
N		 3318static void
3319nfsd4_load_reboot_recovery_data(void)
3320{
3321 int status;
3322
0964a3d3
N		 3323 nfs4_lock_state();
3324 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3325 status = nfsd4_recdir_load();
0964a3d3 3326 nfs4_unlock_state();
190e4fbf
N		 3327 if (status)
3328 printk("NFSD: Failure reading reboot recovery data\n");
3329}
3330
9a8db97e
ME		 3331unsigned long
3332get_nfs4_grace_period(void)
3333{
3334 return max(user_lease_time, lease_time) * HZ;
3335}
3336
c2f1a551
MS		 3337/*
3338 * Since the lifetime of a delegation isn't limited to that of an open, a
3339 * client may quite reasonably hang on to a delegation as long as it has
3340 * the inode cached. This becomes an obvious problem the first time a
3341 * client's inode cache approaches the size of the server's total memory.
3342 *
3343 * For now we avoid this problem by imposing a hard limit on the number
3344 * of delegations, which varies according to the server's memory size.
3345 */
3346static void
3347set_max_delegations(void)
3348{
3349 /*
3350 * Allow at most 4 delegations per megabyte of RAM. Quick
3351 * estimates suggest that in the worst case (where every delegation
3352 * is for a different inode), a delegation could take about 1.5K,
3353 * giving a worst case usage of about 6% of memory.
3354 */
3355 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3356}
3357
ac4d8ff2
N		 3358/* initialization to perform when the nfsd service is started: */
3359
3360static void
3361__nfs4_state_start(void)
3362{
9a8db97e 3363 unsigned long grace_time;
ac4d8ff2 3364
1da177e4 3365 boot_time = get_seconds();
af558e33 3366 grace_time = get_nfs4_grace_period();
d99a05ad 3367 lease_time = user_lease_time;
af558e33 3368 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3369 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3370 grace_time/HZ);
58da282b 3371 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3372 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3373 set_max_delegations();
1da177e4
LT		 3374}
3375
e8ff2a84 3376void
76a3550e 3377nfs4_state_start(void)
1da177e4 3378{
1da177e4 3379 if (nfs4_init)
e8ff2a84 3380 return;
190e4fbf 3381 nfsd4_load_reboot_recovery_data();
76a3550e 3382 __nfs4_state_start();
1da177e4 3383 nfs4_init = 1;
e8ff2a84 3384 return;
1da177e4
LT		 3385}
3386
1da177e4
LT		 3387time_t
3388nfs4_lease_time(void)
3389{
3390 return lease_time;
3391}
3392
3393static void
3394__nfs4_state_shutdown(void)
3395{
3396 int i;
3397 struct nfs4_client *clp = NULL;
3398 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3399 struct list_head *pos, *next, reaplist;
3400
1da177e4
LT		 3401 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3402 while (!list_empty(&conf_id_hashtbl[i])) {
3403 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3404 expire_client(clp);
3405 }
3406 while (!list_empty(&unconf_str_hashtbl[i])) {
3407 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3408 expire_client(clp);
3409 }
3410 }
3411 INIT_LIST_HEAD(&reaplist);
3412 spin_lock(&recall_lock);
3413 list_for_each_safe(pos, next, &del_recall_lru) {
3414 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3415 list_move(&dp->dl_recall_lru, &reaplist);
3416 }
3417 spin_unlock(&recall_lock);
3418 list_for_each_safe(pos, next, &reaplist) {
3419 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3420 list_del_init(&dp->dl_recall_lru);
3421 unhash_delegation(dp);
3422 }
3423
190e4fbf 3424 nfsd4_shutdown_recdir();
1da177e4 3425 nfs4_init = 0;
1da177e4
LT		 3426}
3427
3428void
3429nfs4_state_shutdown(void)
3430{
5e8d5c29
N		 3431 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3432 destroy_workqueue(laundry_wq);
2c5e7615 3433 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3434 nfs4_lock_state();
3435 nfs4_release_reclaim();
3436 __nfs4_state_shutdown();
1da177e4
LT		 3437 nfs4_unlock_state();
3438}
3439
3dd98a3b
JL		 3440/*
3441 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3442 * accessed when nfsd is starting.
3443 */
0964a3d3
N		 3444static void
3445nfs4_set_recdir(char *recdir)
3446{
0964a3d3 3447 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3448}
3449
3450/*
3451 * Change the NFSv4 recovery directory to recdir.
3452 */
3453int
3454nfs4_reset_recoverydir(char *recdir)
3455{
3456 int status;
a63bb996 3457 struct path path;
0964a3d3 3458
a63bb996 3459 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3460 if (status)
3461 return status;
3462 status = -ENOTDIR;
a63bb996 3463 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3464 nfs4_set_recdir(recdir);
3465 status = 0;
3466 }
a63bb996 3467 path_put(&path);
0964a3d3
N		 3468 return status;
3469}
3470
3dd98a3b
JL		 3471char *
3472nfs4_recoverydir(void)
3473{
3474 return user_recovery_dirname;
3475}
3476
1da177e4
LT		 3477/*
3478 * Called when leasetime is changed.
3479 *
d99a05ad
N		 3480 * The only way the protocol gives us to handle on-the-fly lease changes is to
3481 * simulate a reboot. Instead of doing that, we just wait till the next time
3482 * we start to register any changes in lease time. If the administrator
3483 * really wants to change the lease time *now*, they can go ahead and bring
3484 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3485 *
3486 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3487 * when nfsd is starting
1da177e4
LT		 3488 */
3489void
3490nfs4_reset_lease(time_t leasetime)
3491{
d99a05ad 3492 user_lease_time = leasetime;
1da177e4 3493}
Linux 6.x block layer and io_uring tree(s)