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nfsd41: match clientid establishment method
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
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
a1bcecd2
AA		 718/*
719 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
720 * parameter. Matching is based on the fact the at least one of the
721 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
722 *
723 * FIXME: we need to unify the clientid namespaces for nfsv4.x
724 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
725 * and SET_CLIENTID{,_CONFIRM}
726 */
727static inline int
728match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
729{
730 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
731 return use_exchange_id == has_exchange_flags;
732}
733
28ce6054 734static struct nfs4_client *
a1bcecd2
AA		 735find_confirmed_client_by_str(const char *dname, unsigned int hashval,
736 bool use_exchange_id)
28ce6054
N		 737{
738 struct nfs4_client *clp;
739
740 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 741 if (same_name(clp->cl_recdir, dname) &&
742 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 743 return clp;
744 }
745 return NULL;
746}
747
748static struct nfs4_client *
a1bcecd2
AA		 749find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
750 bool use_exchange_id)
28ce6054
N		 751{
752 struct nfs4_client *clp;
753
754 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 755 if (same_name(clp->cl_recdir, dname) &&
756 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 757 return clp;
758 }
759 return NULL;
760}
761
1da177e4
LT		 762/* a helper function for parse_callback */
763static int
764parse_octet(unsigned int *lenp, char **addrp)
765{
766 unsigned int len = *lenp;
767 char *p = *addrp;
768 int n = -1;
769 char c;
770
771 for (;;) {
772 if (!len)
773 break;
774 len--;
775 c = *p++;
776 if (c == '.')
777 break;
778 if ((c < '0') || (c > '9')) {
779 n = -1;
780 break;
781 }
782 if (n < 0)
783 n = 0;
784 n = (n * 10) + (c - '0');
785 if (n > 255) {
786 n = -1;
787 break;
788 }
789 }
790 *lenp = len;
791 *addrp = p;
792 return n;
793}
794
795/* parse and set the setclientid ipv4 callback address */
fd39ca9a 796static int
1da177e4
LT		 797parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
798{
799 int temp = 0;
800 u32 cbaddr = 0;
801 u16 cbport = 0;
802 u32 addrlen = addr_len;
803 char *addr = addr_val;
804 int i, shift;
805
806 /* ipaddress */
807 shift = 24;
808 for(i = 4; i > 0 ; i--) {
809 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
810 return 0;
811 }
812 cbaddr |= (temp << shift);
813 if (shift > 0)
814 shift -= 8;
815 }
816 *cbaddrp = cbaddr;
817
818 /* port */
819 shift = 8;
820 for(i = 2; i > 0 ; i--) {
821 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
822 return 0;
823 }
824 cbport |= (temp << shift);
825 if (shift > 0)
826 shift -= 8;
827 }
828 *cbportp = cbport;
829 return 1;
830}
831
fd39ca9a 832static void
1da177e4
LT		 833gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
834{
835 struct nfs4_callback *cb = &clp->cl_callback;
836
837 /* Currently, we only support tcp for the callback channel */
838 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
839 goto out_err;
840
841 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
842 &cb->cb_addr, &cb->cb_port)))
843 goto out_err;
844 cb->cb_prog = se->se_callback_prog;
845 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 846 return;
847out_err:
849823c5 848 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 849 "will not receive delegations\n",
850 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
851
1da177e4
LT		 852 return;
853}
854
0733d213
AA		 855/*
856 * Set the exchange_id flags returned by the server.
857 */
858static void
859nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
860{
861 /* pNFS is not supported */
862 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
863
864 /* Referrals are supported, Migration is not. */
865 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
866
867 /* set the wire flags to return to client. */
868 clid->flags = new->cl_exchange_flags;
869}
870
069b6ad4
AA		 871__be32
872nfsd4_exchange_id(struct svc_rqst *rqstp,
873 struct nfsd4_compound_state *cstate,
874 struct nfsd4_exchange_id *exid)
875{
0733d213
AA		 876 struct nfs4_client *unconf, *conf, *new;
877 int status;
878 unsigned int strhashval;
879 char dname[HEXDIR_LEN];
880 nfs4_verifier verf = exid->verifier;
881 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
882
883 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
884 " ip_addr=%u flags %x, spa_how %d\n",
885 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
886 ip_addr, exid->flags, exid->spa_how);
887
888 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
889 return nfserr_inval;
890
891 /* Currently only support SP4_NONE */
892 switch (exid->spa_how) {
893 case SP4_NONE:
894 break;
895 case SP4_SSV:
896 return nfserr_encr_alg_unsupp;
897 default:
898 BUG(); /* checked by xdr code */
899 case SP4_MACH_CRED:
900 return nfserr_serverfault; /* no excuse :-/ */
901 }
902
903 status = nfs4_make_rec_clidname(dname, &exid->clname);
904
905 if (status)
906 goto error;
907
908 strhashval = clientstr_hashval(dname);
909
910 nfs4_lock_state();
911 status = nfs_ok;
912
a1bcecd2 913 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 914 if (conf) {
915 if (!same_verf(&verf, &conf->cl_verifier)) {
916 /* 18.35.4 case 8 */
917 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
918 status = nfserr_not_same;
919 goto out;
920 }
921 /* Client reboot: destroy old state */
922 expire_client(conf);
923 goto out_new;
924 }
925 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
926 /* 18.35.4 case 9 */
927 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
928 status = nfserr_perm;
929 goto out;
930 }
931 expire_client(conf);
932 goto out_new;
933 }
934 if (ip_addr != conf->cl_addr &&
935 !(exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)) {
936 /* Client collision. 18.35.4 case 3 */
937 status = nfserr_clid_inuse;
938 goto out;
939 }
940 /*
941 * Set bit when the owner id and verifier map to an already
942 * confirmed client id (18.35.3).
943 */
944 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
945
946 /*
947 * Falling into 18.35.4 case 2, possible router replay.
948 * Leave confirmed record intact and return same result.
949 */
950 copy_verf(conf, &verf);
951 new = conf;
952 goto out_copy;
953 } else {
954 /* 18.35.4 case 7 */
955 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
956 status = nfserr_noent;
957 goto out;
958 }
959 }
960
a1bcecd2 961 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 962 if (unconf) {
963 /*
964 * Possible retry or client restart. Per 18.35.4 case 4,
965 * a new unconfirmed record should be generated regardless
966 * of whether any properties have changed.
967 */
968 expire_client(unconf);
969 }
970
971out_new:
972 /* Normal case */
973 new = create_client(exid->clname, dname);
974 if (new == NULL) {
975 status = nfserr_resource;
976 goto out;
977 }
978
979 copy_verf(new, &verf);
980 copy_cred(&new->cl_cred, &rqstp->rq_cred);
981 new->cl_addr = ip_addr;
982 gen_clid(new);
983 gen_confirm(new);
984 add_to_unconfirmed(new, strhashval);
985out_copy:
986 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
987 exid->clientid.cl_id = new->cl_clientid.cl_id;
988
989 new->cl_seqid = exid->seqid = 1;
990 nfsd4_set_ex_flags(new, exid);
991
992 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
993 new->cl_seqid, new->cl_exchange_flags);
994 status = nfs_ok;
995
996out:
997 nfs4_unlock_state();
998error:
999 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1000 return status;
069b6ad4
AA		 1001}
1002
1003__be32
1004nfsd4_create_session(struct svc_rqst *rqstp,
1005 struct nfsd4_compound_state *cstate,
1006 struct nfsd4_create_session *cr_ses)
1007{
1008 return -1; /* stub */
1009}
1010
1011__be32
1012nfsd4_destroy_session(struct svc_rqst *r,
1013 struct nfsd4_compound_state *cstate,
1014 struct nfsd4_destroy_session *sessionid)
1015{
1016 return -1; /* stub */
1017}
1018
1019__be32
1020nfsd4_sequence(struct svc_rqst *r,
1021 struct nfsd4_compound_state *cstate,
1022 struct nfsd4_sequence *seq)
1023{
1024 return -1; /* stub */
1025}
1026
b37ad28b 1027__be32
b591480b
BF		 1028nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1029 struct nfsd4_setclientid *setclid)
1da177e4 1030{
27459f09 1031 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1032 struct xdr_netobj clname = {
1033 .len = setclid->se_namelen,
1034 .data = setclid->se_name,
1035 };
1036 nfs4_verifier clverifier = setclid->se_verf;
1037 unsigned int strhashval;
28ce6054 1038 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1039 __be32 status;
68e76ad0 1040 char *princ;
a55370a3 1041 char dname[HEXDIR_LEN];
1da177e4 1042
1da177e4 1043 if (!check_name(clname))
73aea4ec 1044 return nfserr_inval;
1da177e4 1045
a55370a3
N		 1046 status = nfs4_make_rec_clidname(dname, &clname);
1047 if (status)
73aea4ec 1048 return status;
a55370a3 1049
1da177e4
LT		 1050 /*
1051 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1052 * We get here on a DRC miss.
1053 */
1054
a55370a3 1055 strhashval = clientstr_hashval(dname);
1da177e4 1056
1da177e4 1057 nfs4_lock_state();
a1bcecd2 1058 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1059 if (conf) {
a186e767 1060 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1061 status = nfserr_clid_inuse;
026722c2
BF		 1062 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1063 dprintk("NFSD: setclientid: string in use by client"
1064 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1065 goto out;
1066 }
1da177e4 1067 }
a186e767
BF		 1068 /*
1069 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1070 * has a description of SETCLIENTID request processing consisting
1071 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1072 */
a1bcecd2 1073 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1074 status = nfserr_resource;
1075 if (!conf) {
a186e767
BF		 1076 /*
1077 * RFC 3530 14.2.33 CASE 4:
1078 * placed first, because it is the normal case
1da177e4
LT		 1079 */
1080 if (unconf)
1081 expire_client(unconf);
a55370a3
N		 1082 new = create_client(clname, dname);
1083 if (new == NULL)
1da177e4 1084 goto out;
1da177e4 1085 gen_clid(new);
599e0a22 1086 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1087 /*
a186e767
BF		 1088 * RFC 3530 14.2.33 CASE 1:
1089 * probable callback update
1da177e4 1090 */
31f4a6c1
N		 1091 if (unconf) {
1092 /* Note this is removing unconfirmed {*x***},
1093 * which is stronger than RFC recommended {vxc**}.
1094 * This has the advantage that there is at most
1095 * one {*x***} in either list at any time.
1096 */
1097 expire_client(unconf);
1da177e4 1098 }
a55370a3
N		 1099 new = create_client(clname, dname);
1100 if (new == NULL)
1da177e4 1101 goto out;
1da177e4 1102 copy_clid(new, conf);
1da177e4
LT		 1103 } else if (!unconf) {
1104 /*
a186e767
BF		 1105 * RFC 3530 14.2.33 CASE 2:
1106 * probable client reboot; state will be removed if
1107 * confirmed.
1da177e4 1108 */
a55370a3
N		 1109 new = create_client(clname, dname);
1110 if (new == NULL)
1da177e4 1111 goto out;
1da177e4 1112 gen_clid(new);
49ba8781 1113 } else {
a186e767
BF		 1114 /*
1115 * RFC 3530 14.2.33 CASE 3:
1116 * probable client reboot; state will be removed if
1117 * confirmed.
1da177e4
LT		 1118 */
1119 expire_client(unconf);
a55370a3
N		 1120 new = create_client(clname, dname);
1121 if (new == NULL)
1da177e4 1122 goto out;
1da177e4 1123 gen_clid(new);
1da177e4 1124 }
c175b83c
BF		 1125 copy_verf(new, &clverifier);
1126 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1127 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1128 princ = svc_gss_principal(rqstp);
1129 if (princ) {
1130 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1131 if (new->cl_principal == NULL) {
1132 free_client(new);
1133 goto out;
1134 }
1135 }
c175b83c
BF		 1136 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1137 gen_confirm(new);
1138 gen_callback(new, setclid);
1139 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1140 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1141 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1142 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1143 status = nfs_ok;
1144out:
1145 nfs4_unlock_state();
1146 return status;
1147}
1148
1149
1150/*
a186e767
BF		 1151 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1152 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1153 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1154 */
b37ad28b 1155__be32
b591480b
BF		 1156nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1157 struct nfsd4_compound_state *cstate,
1158 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1159{
27459f09 1160 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1161 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1162 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1163 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1164 __be32 status;
1da177e4
LT		 1165
1166 if (STALE_CLIENTID(clid))
1167 return nfserr_stale_clientid;
1168 /*
1169 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1170 * We get here on a DRC miss.
1171 */
1172
1173 nfs4_lock_state();
21ab45a4
N		 1174
1175 conf = find_confirmed_client(clid);
1176 unconf = find_unconfirmed_client(clid);
1177
1178 status = nfserr_clid_inuse;
27459f09 1179 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1180 goto out;
27459f09 1181 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1182 goto out;
1183
a186e767
BF		 1184 /*
1185 * section 14.2.34 of RFC 3530 has a description of
1186 * SETCLIENTID_CONFIRM request processing consisting
1187 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1188 */
366e0c1d 1189 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1190 /*
1191 * RFC 3530 14.2.34 CASE 1:
1192 * callback update
1193 */
599e0a22 1194 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1195 status = nfserr_clid_inuse;
1196 else {
1a69c179
N		 1197 /* XXX: We just turn off callbacks until we can handle
1198 * change request correctly. */
cb36d634 1199 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1200 gen_confirm(conf);
46309029 1201 nfsd4_remove_clid_dir(unconf);
1a69c179 1202 expire_client(unconf);
1da177e4 1203 status = nfs_ok;
1a69c179 1204
1da177e4 1205 }
f3aba4e5 1206 } else if (conf && !unconf) {
a186e767
BF		 1207 /*
1208 * RFC 3530 14.2.34 CASE 2:
1209 * probable retransmitted request; play it safe and
1210 * do nothing.
7c79f737 1211 */
599e0a22 1212 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1213 status = nfserr_clid_inuse;
21ab45a4 1214 else
1da177e4 1215 status = nfs_ok;
7c79f737 1216 } else if (!conf && unconf
599e0a22 1217 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1218 /*
1219 * RFC 3530 14.2.34 CASE 3:
1220 * Normal case; new or rebooted client:
7c79f737 1221 */
599e0a22 1222 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1223 status = nfserr_clid_inuse;
1224 } else {
1a69c179
N		 1225 unsigned int hash =
1226 clientstr_hashval(unconf->cl_recdir);
1227 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1228 hash, false);
1a69c179 1229 if (conf) {
c7b9a459 1230 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1231 expire_client(conf);
1232 }
1da177e4 1233 move_to_confirmed(unconf);
21ab45a4 1234 conf = unconf;
46f8a64b 1235 nfsd4_probe_callback(conf);
1a69c179 1236 status = nfs_ok;
1da177e4 1237 }
599e0a22
BF		 1238 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1239 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1240 &confirm)))) {
a186e767
BF		 1241 /*
1242 * RFC 3530 14.2.34 CASE 4:
1243 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1244 */
1da177e4 1245 status = nfserr_stale_clientid;
7c79f737 1246 } else {
08e8987c
N		 1247 /* check that we have hit one of the cases...*/
1248 status = nfserr_clid_inuse;
1249 }
1da177e4 1250out:
1da177e4
LT		 1251 nfs4_unlock_state();
1252 return status;
1253}
1254
1da177e4
LT		 1255/* OPEN Share state helper functions */
1256static inline struct nfs4_file *
1257alloc_init_file(struct inode *ino)
1258{
1259 struct nfs4_file *fp;
1260 unsigned int hashval = file_hashval(ino);
1261
e60d4398
N		 1262 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1263 if (fp) {
8b671b80 1264 atomic_set(&fp->fi_ref, 1);
1da177e4 1265 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1266 INIT_LIST_HEAD(&fp->fi_stateids);
1267 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1268 spin_lock(&recall_lock);
1da177e4 1269 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1270 spin_unlock(&recall_lock);
1da177e4
LT		 1271 fp->fi_inode = igrab(ino);
1272 fp->fi_id = current_fileid++;
47f9940c 1273 fp->fi_had_conflict = false;
1da177e4
LT		 1274 return fp;
1275 }
1276 return NULL;
1277}
1278
e60d4398 1279static void
e18b890b 1280nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1281{
e60d4398
N		 1282 if (*slab == NULL)
1283 return;
1a1d92c1 1284 kmem_cache_destroy(*slab);
e60d4398 1285 *slab = NULL;
1da177e4
LT		 1286}
1287
e8ff2a84 1288void
1da177e4
LT		 1289nfsd4_free_slabs(void)
1290{
e60d4398
N		 1291 nfsd4_free_slab(&stateowner_slab);
1292 nfsd4_free_slab(&file_slab);
5ac049ac 1293 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1294 nfsd4_free_slab(&deleg_slab);
e60d4398 1295}
1da177e4 1296
e60d4398
N		 1297static int
1298nfsd4_init_slabs(void)
1299{
1300 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1301 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1302 if (stateowner_slab == NULL)
1303 goto out_nomem;
1304 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1305 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1306 if (file_slab == NULL)
1307 goto out_nomem;
5ac049ac 1308 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1309 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1310 if (stateid_slab == NULL)
1311 goto out_nomem;
5b2d21c1 1312 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1313 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1314 if (deleg_slab == NULL)
1315 goto out_nomem;
e60d4398
N		 1316 return 0;
1317out_nomem:
1318 nfsd4_free_slabs();
1319 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1320 return -ENOMEM;
1da177e4
LT		 1321}
1322
1323void
1324nfs4_free_stateowner(struct kref *kref)
1325{
1326 struct nfs4_stateowner *sop =
1327 container_of(kref, struct nfs4_stateowner, so_ref);
1328 kfree(sop->so_owner.data);
1329 kmem_cache_free(stateowner_slab, sop);
1330}
1331
1332static inline struct nfs4_stateowner *
1333alloc_stateowner(struct xdr_netobj *owner)
1334{
1335 struct nfs4_stateowner *sop;
1336
1337 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1338 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1339 memcpy(sop->so_owner.data, owner->data, owner->len);
1340 sop->so_owner.len = owner->len;
1341 kref_init(&sop->so_ref);
1342 return sop;
1343 }
1344 kmem_cache_free(stateowner_slab, sop);
1345 }
1346 return NULL;
1347}
1348
1349static struct nfs4_stateowner *
1350alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1351 struct nfs4_stateowner *sop;
1352 struct nfs4_replay *rp;
1353 unsigned int idhashval;
1354
1355 if (!(sop = alloc_stateowner(&open->op_owner)))
1356 return NULL;
1357 idhashval = ownerid_hashval(current_ownerid);
1358 INIT_LIST_HEAD(&sop->so_idhash);
1359 INIT_LIST_HEAD(&sop->so_strhash);
1360 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1361 INIT_LIST_HEAD(&sop->so_stateids);
1362 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1363 INIT_LIST_HEAD(&sop->so_close_lru);
1364 sop->so_time = 0;
1365 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1366 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1367 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1368 sop->so_is_open_owner = 1;
1369 sop->so_id = current_ownerid++;
1370 sop->so_client = clp;
1371 sop->so_seqid = open->op_seqid;
1372 sop->so_confirmed = 0;
1373 rp = &sop->so_replay;
de1ae286 1374 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1375 rp->rp_buflen = 0;
1376 rp->rp_buf = rp->rp_ibuf;
1377 return sop;
1378}
1379
1da177e4
LT		 1380static inline void
1381init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1382 struct nfs4_stateowner *sop = open->op_stateowner;
1383 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1384
1385 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1386 INIT_LIST_HEAD(&stp->st_perstateowner);
1387 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1388 INIT_LIST_HEAD(&stp->st_perfile);
1389 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1390 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1391 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1392 stp->st_stateowner = sop;
13cd2184 1393 get_nfs4_file(fp);
1da177e4
LT		 1394 stp->st_file = fp;
1395 stp->st_stateid.si_boot = boot_time;
1396 stp->st_stateid.si_stateownerid = sop->so_id;
1397 stp->st_stateid.si_fileid = fp->fi_id;
1398 stp->st_stateid.si_generation = 0;
1399 stp->st_access_bmap = 0;
1400 stp->st_deny_bmap = 0;
1401 __set_bit(open->op_share_access, &stp->st_access_bmap);
1402 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1403 stp->st_openstp = NULL;
1da177e4
LT		 1404}
1405
fd39ca9a 1406static void
1da177e4
LT		 1407move_to_close_lru(struct nfs4_stateowner *sop)
1408{
1409 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1410
358dd55a 1411 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1412 sop->so_time = get_seconds();
1413}
1414
1da177e4 1415static int
599e0a22
BF		 1416same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1417 clientid_t *clid)
1418{
1419 return (sop->so_owner.len == owner->len) &&
1420 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1421 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1422}
1423
1424static struct nfs4_stateowner *
1425find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1426{
1427 struct nfs4_stateowner *so = NULL;
1428
1429 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1430 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1431 return so;
1432 }
1433 return NULL;
1434}
1435
1436/* search file_hashtbl[] for file */
1437static struct nfs4_file *
1438find_file(struct inode *ino)
1439{
1440 unsigned int hashval = file_hashval(ino);
1441 struct nfs4_file *fp;
1442
8b671b80 1443 spin_lock(&recall_lock);
1da177e4 1444 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1445 if (fp->fi_inode == ino) {
1446 get_nfs4_file(fp);
8b671b80 1447 spin_unlock(&recall_lock);
1da177e4 1448 return fp;
13cd2184 1449 }
1da177e4 1450 }
8b671b80 1451 spin_unlock(&recall_lock);
1da177e4
LT		 1452 return NULL;
1453}
1454
8838dc43 1455static inline int access_valid(u32 x)
ba5a6a19 1456{
8838dc43
BF		 1457 if (x < NFS4_SHARE_ACCESS_READ)
1458 return 0;
1459 if (x > NFS4_SHARE_ACCESS_BOTH)
1460 return 0;
1461 return 1;
ba5a6a19
BF		 1462}
1463
8838dc43 1464static inline int deny_valid(u32 x)
ba5a6a19 1465{
8838dc43
BF		 1466 /* Note: unlike access bits, deny bits may be zero. */
1467 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1468}
1da177e4 1469
4f83aa30
BF		 1470/*
1471 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1472 * st_{access,deny}_bmap field of the stateid, in order to track not
1473 * only what share bits are currently in force, but also what
1474 * combinations of share bits previous opens have used. This allows us
1475 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1476 * return an error if the client attempt to downgrade to a combination
1477 * of share bits not explicable by closing some of its previous opens.
1478 *
1479 * XXX: This enforcement is actually incomplete, since we don't keep
1480 * track of access/deny bit combinations; so, e.g., we allow:
1481 *
1482 * OPEN allow read, deny write
1483 * OPEN allow both, deny none
1484 * DOWNGRADE allow read, deny none
1485 *
1486 * which we should reject.
1487 */
fd39ca9a 1488static void
1da177e4
LT		 1489set_access(unsigned int *access, unsigned long bmap) {
1490 int i;
1491
1492 *access = 0;
1493 for (i = 1; i < 4; i++) {
1494 if (test_bit(i, &bmap))
1495 *access |= i;
1496 }
1497}
1498
fd39ca9a 1499static void
1da177e4
LT		 1500set_deny(unsigned int *deny, unsigned long bmap) {
1501 int i;
1502
1503 *deny = 0;
1504 for (i = 0; i < 4; i++) {
1505 if (test_bit(i, &bmap))
1506 *deny |= i ;
1507 }
1508}
1509
1510static int
1511test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1512 unsigned int access, deny;
1513
1514 set_access(&access, stp->st_access_bmap);
1515 set_deny(&deny, stp->st_deny_bmap);
1516 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1517 return 0;
1518 return 1;
1519}
1520
1521/*
1522 * Called to check deny when READ with all zero stateid or
1523 * WRITE with all zero or all one stateid
1524 */
b37ad28b 1525static __be32
1da177e4
LT		 1526nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1527{
1528 struct inode *ino = current_fh->fh_dentry->d_inode;
1529 struct nfs4_file *fp;
1530 struct nfs4_stateid *stp;
b37ad28b 1531 __be32 ret;
1da177e4
LT		 1532
1533 dprintk("NFSD: nfs4_share_conflict\n");
1534
1535 fp = find_file(ino);
13cd2184
N		 1536 if (!fp)
1537 return nfs_ok;
b700949b 1538 ret = nfserr_locked;
1da177e4 1539 /* Search for conflicting share reservations */
13cd2184
N		 1540 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1541 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1542 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1543 goto out;
1da177e4 1544 }
13cd2184
N		 1545 ret = nfs_ok;
1546out:
1547 put_nfs4_file(fp);
1548 return ret;
1da177e4
LT		 1549}
1550
1551static inline void
1552nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1553{
1554 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1555 drop_file_write_access(filp);
1da177e4
LT		 1556 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1557 }
1558}
1559
1560/*
1561 * Recall a delegation
1562 */
1563static int
1564do_recall(void *__dp)
1565{
1566 struct nfs4_delegation *dp = __dp;
1567
47f9940c 1568 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1569 nfsd4_cb_recall(dp);
1570 return 0;
1571}
1572
1573/*
1574 * Spawn a thread to perform a recall on the delegation represented
1575 * by the lease (file_lock)
1576 *
1577 * Called from break_lease() with lock_kernel() held.
1578 * Note: we assume break_lease will only call this *once* for any given
1579 * lease.
1580 */
1581static
1582void nfsd_break_deleg_cb(struct file_lock *fl)
1583{
1584 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1585 struct task_struct *t;
1586
1587 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1588 if (!dp)
1589 return;
1590
1591 /* We're assuming the state code never drops its reference
1592 * without first removing the lease. Since we're in this lease
1593 * callback (and since the lease code is serialized by the kernel
1594 * lock) we know the server hasn't removed the lease yet, we know
1595 * it's safe to take a reference: */
1596 atomic_inc(&dp->dl_count);
cfdcad4d 1597 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1598
1599 spin_lock(&recall_lock);
1600 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1601 spin_unlock(&recall_lock);
1602
1603 /* only place dl_time is set. protected by lock_kernel*/
1604 dp->dl_time = get_seconds();
1605
0272e1fd
BF		 1606 /*
1607 * We don't want the locks code to timeout the lease for us;
1608 * we'll remove it ourself if the delegation isn't returned
1609 * in time.
1610 */
1611 fl->fl_break_time = 0;
1da177e4
LT		 1612
1613 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1614 if (IS_ERR(t)) {
1615 struct nfs4_client *clp = dp->dl_client;
1616
1617 printk(KERN_INFO "NFSD: Callback thread failed for "
1618 "for client (clientid %08x/%08x)\n",
1619 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1620 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1621 nfs4_put_delegation(dp);
1622 }
1623}
1624
1625/*
1626 * The file_lock is being reapd.
1627 *
1628 * Called by locks_free_lock() with lock_kernel() held.
1629 */
1630static
1631void nfsd_release_deleg_cb(struct file_lock *fl)
1632{
1633 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1634
1635 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1636
1637 if (!(fl->fl_flags & FL_LEASE) || !dp)
1638 return;
1639 dp->dl_flock = NULL;
1640}
1641
1642/*
1643 * Set the delegation file_lock back pointer.
1644 *
a9933cea 1645 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1646 */
1647static
1648void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1649{
1650 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1651
1652 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1653 if (!dp)
1654 return;
1655 dp->dl_flock = new;
1656}
1657
1658/*
a9933cea 1659 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1660 */
1661static
1662int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1663{
1664 struct nfs4_delegation *onlistd =
1665 (struct nfs4_delegation *)onlist->fl_owner;
1666 struct nfs4_delegation *tryd =
1667 (struct nfs4_delegation *)try->fl_owner;
1668
1669 if (onlist->fl_lmops != try->fl_lmops)
1670 return 0;
1671
1672 return onlistd->dl_client == tryd->dl_client;
1673}
1674
1675
1676static
1677int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1678{
1679 if (arg & F_UNLCK)
1680 return lease_modify(onlist, arg);
1681 else
1682 return -EAGAIN;
1683}
1684
fd39ca9a 1685static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1686 .fl_break = nfsd_break_deleg_cb,
1687 .fl_release_private = nfsd_release_deleg_cb,
1688 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1689 .fl_mylease = nfsd_same_client_deleg_cb,
1690 .fl_change = nfsd_change_deleg_cb,
1691};
1692
1693
b37ad28b 1694__be32
1da177e4
LT		 1695nfsd4_process_open1(struct nfsd4_open *open)
1696{
1da177e4
LT		 1697 clientid_t *clientid = &open->op_clientid;
1698 struct nfs4_client *clp = NULL;
1699 unsigned int strhashval;
1700 struct nfs4_stateowner *sop = NULL;
1701
1da177e4 1702 if (!check_name(open->op_owner))
0f442aa2 1703 return nfserr_inval;
1da177e4
LT		 1704
1705 if (STALE_CLIENTID(&open->op_clientid))
1706 return nfserr_stale_clientid;
1707
1708 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1709 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1710 open->op_stateowner = sop;
1711 if (!sop) {
1712 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1713 clp = find_confirmed_client(clientid);
1714 if (clp == NULL)
0f442aa2
BF		 1715 return nfserr_expired;
1716 goto renew;
1da177e4 1717 }
0f442aa2
BF		 1718 if (!sop->so_confirmed) {
1719 /* Replace unconfirmed owners without checking for replay. */
1720 clp = sop->so_client;
f044ff83 1721 release_openowner(sop);
0f442aa2
BF		 1722 open->op_stateowner = NULL;
1723 goto renew;
1724 }
1725 if (open->op_seqid == sop->so_seqid - 1) {
1726 if (sop->so_replay.rp_buflen)
a90b061c 1727 return nfserr_replay_me;
0f442aa2
BF		 1728 /* The original OPEN failed so spectacularly
1729 * that we don't even have replay data saved!
1730 * Therefore, we have no choice but to continue
1731 * processing this OPEN; presumably, we'll
1732 * fail again for the same reason.
1733 */
1734 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1735 goto renew;
1736 }
1737 if (open->op_seqid != sop->so_seqid)
1738 return nfserr_bad_seqid;
1da177e4 1739renew:
0f442aa2
BF		 1740 if (open->op_stateowner == NULL) {
1741 sop = alloc_init_open_stateowner(strhashval, clp, open);
1742 if (sop == NULL)
1743 return nfserr_resource;
1744 open->op_stateowner = sop;
1745 }
1746 list_del_init(&sop->so_close_lru);
1da177e4 1747 renew_client(sop->so_client);
0f442aa2 1748 return nfs_ok;
1da177e4
LT		 1749}
1750
b37ad28b 1751static inline __be32
4a6e43e6
N		 1752nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1753{
1754 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1755 return nfserr_openmode;
1756 else
1757 return nfs_ok;
1758}
1759
52f4fb43
N		 1760static struct nfs4_delegation *
1761find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1762{
1763 struct nfs4_delegation *dp;
1764
ea1da636 1765 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1766 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1767 return dp;
1768 }
1769 return NULL;
1770}
1771
b37ad28b 1772static __be32
567d9829
N		 1773nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1774 struct nfs4_delegation **dp)
1775{
1776 int flags;
b37ad28b 1777 __be32 status = nfserr_bad_stateid;
567d9829
N		 1778
1779 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1780 if (*dp == NULL)
c44c5eeb 1781 goto out;
567d9829
N		 1782 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1783 RD_STATE : WR_STATE;
1784 status = nfs4_check_delegmode(*dp, flags);
1785 if (status)
1786 *dp = NULL;
c44c5eeb
N		 1787out:
1788 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1789 return nfs_ok;
1790 if (status)
1791 return status;
1792 open->op_stateowner->so_confirmed = 1;
1793 return nfs_ok;
567d9829
N		 1794}
1795
b37ad28b 1796static __be32
1da177e4
LT		 1797nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1798{
1799 struct nfs4_stateid *local;
b37ad28b 1800 __be32 status = nfserr_share_denied;
1da177e4
LT		 1801 struct nfs4_stateowner *sop = open->op_stateowner;
1802
8beefa24 1803 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1804 /* ignore lock owners */
1805 if (local->st_stateowner->so_is_open_owner == 0)
1806 continue;
1807 /* remember if we have seen this open owner */
1808 if (local->st_stateowner == sop)
1809 *stpp = local;
1810 /* check for conflicting share reservations */
1811 if (!test_share(local, open))
1812 goto out;
1813 }
1814 status = 0;
1815out:
1816 return status;
1817}
1818
5ac049ac
N		 1819static inline struct nfs4_stateid *
1820nfs4_alloc_stateid(void)
1821{
1822 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1823}
1824
b37ad28b 1825static __be32
1da177e4 1826nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1827 struct nfs4_delegation *dp,
1da177e4
LT		 1828 struct svc_fh *cur_fh, int flags)
1829{
1830 struct nfs4_stateid *stp;
1da177e4 1831
5ac049ac 1832 stp = nfs4_alloc_stateid();
1da177e4
LT		 1833 if (stp == NULL)
1834 return nfserr_resource;
1835
567d9829
N		 1836 if (dp) {
1837 get_file(dp->dl_vfs_file);
1838 stp->st_vfs_file = dp->dl_vfs_file;
1839 } else {
b37ad28b 1840 __be32 status;
567d9829
N		 1841 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1842 &stp->st_vfs_file);
1843 if (status) {
1844 if (status == nfserr_dropit)
1845 status = nfserr_jukebox;
5ac049ac 1846 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1847 return status;
1848 }
1da177e4 1849 }
1da177e4
LT		 1850 *stpp = stp;
1851 return 0;
1852}
1853
b37ad28b 1854static inline __be32
1da177e4
LT		 1855nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1856 struct nfsd4_open *open)
1857{
1858 struct iattr iattr = {
1859 .ia_valid = ATTR_SIZE,
1860 .ia_size = 0,
1861 };
1862 if (!open->op_truncate)
1863 return 0;
1864 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1865 return nfserr_inval;
1da177e4
LT		 1866 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1867}
1868
b37ad28b 1869static __be32
1da177e4
LT		 1870nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1871{
1872 struct file *filp = stp->st_vfs_file;
7eaa36e2 1873 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1874 unsigned int share_access, new_writer;
b37ad28b 1875 __be32 status;
1da177e4
LT		 1876
1877 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1878 new_writer = (~share_access) & open->op_share_access
1879 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1880
6c26d08f 1881 if (new_writer) {
b37ad28b
AV		 1882 int err = get_write_access(inode);
1883 if (err)
1884 return nfserrno(err);
e518f056
BH		 1885 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1886 if (err)
1887 return nfserrno(err);
1888 file_take_write(filp);
6c26d08f 1889 }
1da177e4
LT		 1890 status = nfsd4_truncate(rqstp, cur_fh, open);
1891 if (status) {
6c26d08f
BF		 1892 if (new_writer)
1893 put_write_access(inode);
1da177e4
LT		 1894 return status;
1895 }
1896 /* remember the open */
6c26d08f 1897 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1898 __set_bit(open->op_share_access, &stp->st_access_bmap);
1899 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1900
1901 return nfs_ok;
1902}
1903
1904
1da177e4 1905static void
37515177 1906nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1907{
37515177
N		 1908 open->op_stateowner->so_confirmed = 1;
1909 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1910}
1911
1912/*
1913 * Attempt to hand out a delegation.
1914 */
1915static void
1916nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1917{
1918 struct nfs4_delegation *dp;
1919 struct nfs4_stateowner *sop = stp->st_stateowner;
1920 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1921 struct file_lock fl, *flp = &fl;
1922 int status, flag = 0;
1923
1924 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1925 open->op_recall = 0;
1926 switch (open->op_claim_type) {
1927 case NFS4_OPEN_CLAIM_PREVIOUS:
1928 if (!atomic_read(&cb->cb_set))
1929 open->op_recall = 1;
1930 flag = open->op_delegate_type;
1931 if (flag == NFS4_OPEN_DELEGATE_NONE)
1932 goto out;
1933 break;
1934 case NFS4_OPEN_CLAIM_NULL:
1935 /* Let's not give out any delegations till everyone's
1936 * had the chance to reclaim theirs.... */
af558e33 1937 if (locks_in_grace())
7b190fec
N		 1938 goto out;
1939 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1940 goto out;
1941 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1942 flag = NFS4_OPEN_DELEGATE_WRITE;
1943 else
1944 flag = NFS4_OPEN_DELEGATE_READ;
1945 break;
1946 default:
1947 goto out;
1948 }
1da177e4
LT		 1949
1950 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1951 if (dp == NULL) {
1952 flag = NFS4_OPEN_DELEGATE_NONE;
1953 goto out;
1954 }
1955 locks_init_lock(&fl);
1956 fl.fl_lmops = &nfsd_lease_mng_ops;
1957 fl.fl_flags = FL_LEASE;
9167f501 1958 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1959 fl.fl_end = OFFSET_MAX;
1960 fl.fl_owner = (fl_owner_t)dp;
1961 fl.fl_file = stp->st_vfs_file;
1962 fl.fl_pid = current->tgid;
1963
a9933cea 1964 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1965 * the lock_manager callbacks fl_mylease and fl_change are used
1966 */
9167f501 1967 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1968 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1969 unhash_delegation(dp);
1da177e4
LT		 1970 flag = NFS4_OPEN_DELEGATE_NONE;
1971 goto out;
1972 }
1973
1974 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1975
1976 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1977 dp->dl_stateid.si_boot,
1978 dp->dl_stateid.si_stateownerid,
1979 dp->dl_stateid.si_fileid,
1980 dp->dl_stateid.si_generation);
1981out:
7b190fec
N		 1982 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1983 && flag == NFS4_OPEN_DELEGATE_NONE
1984 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1985 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1986 open->op_delegate_type = flag;
1987}
1988
1989/*
1990 * called with nfs4_lock_state() held.
1991 */
b37ad28b 1992__be32
1da177e4
LT		 1993nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1994{
1995 struct nfs4_file *fp = NULL;
1996 struct inode *ino = current_fh->fh_dentry->d_inode;
1997 struct nfs4_stateid *stp = NULL;
567d9829 1998 struct nfs4_delegation *dp = NULL;
b37ad28b 1999 __be32 status;
1da177e4
LT		 2000
2001 status = nfserr_inval;
ba5a6a19
BF		 2002 if (!access_valid(open->op_share_access)
2003 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2004 goto out;
2005 /*
2006 * Lookup file; if found, lookup stateid and check open request,
2007 * and check for delegations in the process of being recalled.
2008 * If not found, create the nfs4_file struct
2009 */
2010 fp = find_file(ino);
2011 if (fp) {
2012 if ((status = nfs4_check_open(fp, open, &stp)))
2013 goto out;
c44c5eeb
N		 2014 status = nfs4_check_deleg(fp, open, &dp);
2015 if (status)
2016 goto out;
1da177e4 2017 } else {
c44c5eeb
N		 2018 status = nfserr_bad_stateid;
2019 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2020 goto out;
1da177e4
LT		 2021 status = nfserr_resource;
2022 fp = alloc_init_file(ino);
2023 if (fp == NULL)
2024 goto out;
2025 }
2026
2027 /*
2028 * OPEN the file, or upgrade an existing OPEN.
2029 * If truncate fails, the OPEN fails.
2030 */
2031 if (stp) {
2032 /* Stateid was found, this is an OPEN upgrade */
2033 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2034 if (status)
2035 goto out;
444c2c07 2036 update_stateid(&stp->st_stateid);
1da177e4
LT		 2037 } else {
2038 /* Stateid was not found, this is a new OPEN */
2039 int flags = 0;
9ecb6a08 2040 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2041 flags |= NFSD_MAY_READ;
1da177e4 2042 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2043 flags |= NFSD_MAY_WRITE;
567d9829
N		 2044 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2045 if (status)
1da177e4
LT		 2046 goto out;
2047 init_stateid(stp, fp, open);
2048 status = nfsd4_truncate(rqstp, current_fh, open);
2049 if (status) {
2283963f 2050 release_open_stateid(stp);
1da177e4
LT		 2051 goto out;
2052 }
2053 }
2054 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2055
2056 /*
2057 * Attempt to hand out a delegation. No error return, because the
2058 * OPEN succeeds even if we fail.
2059 */
2060 nfs4_open_delegation(current_fh, open, stp);
2061
2062 status = nfs_ok;
2063
2064 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2065 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2066 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2067out:
13cd2184
N		 2068 if (fp)
2069 put_nfs4_file(fp);
37515177
N		 2070 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2071 nfs4_set_claim_prev(open);
1da177e4
LT		 2072 /*
2073 * To finish the open response, we just need to set the rflags.
2074 */
2075 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2076 if (!open->op_stateowner->so_confirmed)
2077 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2078
2079 return status;
2080}
2081
b37ad28b 2082__be32
b591480b
BF		 2083nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2084 clientid_t *clid)
1da177e4
LT		 2085{
2086 struct nfs4_client *clp;
b37ad28b 2087 __be32 status;
1da177e4
LT		 2088
2089 nfs4_lock_state();
2090 dprintk("process_renew(%08x/%08x): starting\n",
2091 clid->cl_boot, clid->cl_id);
2092 status = nfserr_stale_clientid;
2093 if (STALE_CLIENTID(clid))
2094 goto out;
2095 clp = find_confirmed_client(clid);
2096 status = nfserr_expired;
2097 if (clp == NULL) {
2098 /* We assume the client took too long to RENEW. */
2099 dprintk("nfsd4_renew: clientid not found!\n");
2100 goto out;
2101 }
2102 renew_client(clp);
2103 status = nfserr_cb_path_down;
ea1da636 2104 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 2105 && !atomic_read(&clp->cl_callback.cb_set))
2106 goto out;
2107 status = nfs_ok;
2108out:
2109 nfs4_unlock_state();
2110 return status;
2111}
2112
af558e33
BF		 2113struct lock_manager nfsd4_manager = {
2114};
2115
a76b4319 2116static void
af558e33 2117nfsd4_end_grace(void)
a76b4319
N		 2118{
2119 dprintk("NFSD: end of grace period\n");
c7b9a459 2120 nfsd4_recdir_purge_old();
af558e33 2121 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2122}
2123
fd39ca9a 2124static time_t
1da177e4
LT		 2125nfs4_laundromat(void)
2126{
2127 struct nfs4_client *clp;
2128 struct nfs4_stateowner *sop;
2129 struct nfs4_delegation *dp;
2130 struct list_head *pos, *next, reaplist;
2131 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2132 time_t t, clientid_val = NFSD_LEASE_TIME;
2133 time_t u, test_val = NFSD_LEASE_TIME;
2134
2135 nfs4_lock_state();
2136
2137 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2138 if (locks_in_grace())
2139 nfsd4_end_grace();
1da177e4
LT		 2140 list_for_each_safe(pos, next, &client_lru) {
2141 clp = list_entry(pos, struct nfs4_client, cl_lru);
2142 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2143 t = clp->cl_time - cutoff;
2144 if (clientid_val > t)
2145 clientid_val = t;
2146 break;
2147 }
2148 dprintk("NFSD: purging unused client (clientid %08x)\n",
2149 clp->cl_clientid.cl_id);
c7b9a459 2150 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2151 expire_client(clp);
2152 }
2153 INIT_LIST_HEAD(&reaplist);
2154 spin_lock(&recall_lock);
2155 list_for_each_safe(pos, next, &del_recall_lru) {
2156 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2157 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2158 u = dp->dl_time - cutoff;
2159 if (test_val > u)
2160 test_val = u;
2161 break;
2162 }
2163 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2164 dp, dp->dl_flock);
2165 list_move(&dp->dl_recall_lru, &reaplist);
2166 }
2167 spin_unlock(&recall_lock);
2168 list_for_each_safe(pos, next, &reaplist) {
2169 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2170 list_del_init(&dp->dl_recall_lru);
2171 unhash_delegation(dp);
2172 }
2173 test_val = NFSD_LEASE_TIME;
2174 list_for_each_safe(pos, next, &close_lru) {
2175 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2176 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2177 u = sop->so_time - cutoff;
2178 if (test_val > u)
2179 test_val = u;
2180 break;
2181 }
2182 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2183 sop->so_id);
f044ff83 2184 release_openowner(sop);
1da177e4
LT		 2185 }
2186 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2187 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2188 nfs4_unlock_state();
2189 return clientid_val;
2190}
2191
a254b246
HH		 2192static struct workqueue_struct *laundry_wq;
2193static void laundromat_main(struct work_struct *);
2194static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2195
2196static void
c4028958 2197laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2198{
2199 time_t t;
2200
2201 t = nfs4_laundromat();
2202 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2203 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2204}
2205
fd39ca9a 2206static struct nfs4_stateowner *
f8816512
N		 2207search_close_lru(u32 st_id, int flags)
2208{
1da177e4
LT		 2209 struct nfs4_stateowner *local = NULL;
2210
1da177e4
LT		 2211 if (flags & CLOSE_STATE) {
2212 list_for_each_entry(local, &close_lru, so_close_lru) {
2213 if (local->so_id == st_id)
2214 return local;
2215 }
2216 }
2217 return NULL;
2218}
2219
2220static inline int
2221nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2222{
7eaa36e2 2223 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2224}
2225
2226static int
2227STALE_STATEID(stateid_t *stateid)
2228{
2229 if (stateid->si_boot == boot_time)
2230 return 0;
849823c5 2231 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2232 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2233 stateid->si_generation);
2234 return 1;
2235}
2236
2237static inline int
2238access_permit_read(unsigned long access_bmap)
2239{
2240 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2241 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2242 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2243}
2244
2245static inline int
2246access_permit_write(unsigned long access_bmap)
2247{
2248 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2249 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2250}
2251
2252static
b37ad28b 2253__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2254{
b37ad28b 2255 __be32 status = nfserr_openmode;
1da177e4
LT		 2256
2257 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2258 goto out;
2259 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2260 goto out;
2261 status = nfs_ok;
2262out:
2263 return status;
2264}
2265
b37ad28b 2266static inline __be32
1da177e4
LT		 2267check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2268{
203a8c8e 2269 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2270 return nfs_ok;
af558e33 2271 else if (locks_in_grace()) {
1da177e4
LT		 2272 /* Answer in remaining cases depends on existance of
2273 * conflicting state; so we must wait out the grace period. */
2274 return nfserr_grace;
2275 } else if (flags & WR_STATE)
2276 return nfs4_share_conflict(current_fh,
2277 NFS4_SHARE_DENY_WRITE);
2278 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2279 return nfs4_share_conflict(current_fh,
2280 NFS4_SHARE_DENY_READ);
2281}
2282
2283/*
2284 * Allow READ/WRITE during grace period on recovered state only for files
2285 * that are not able to provide mandatory locking.
2286 */
2287static inline int
18f82731 2288grace_disallows_io(struct inode *inode)
1da177e4 2289{
203a8c8e 2290 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2291}
2292
0836f587
BF		 2293static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2294{
2295 /* If the client sends us a stateid from the future, it's buggy: */
2296 if (in->si_generation > ref->si_generation)
2297 return nfserr_bad_stateid;
2298 /*
2299 * The following, however, can happen. For example, if the
2300 * client sends an open and some IO at the same time, the open
2301 * may bump si_generation while the IO is still in flight.
2302 * Thanks to hard links and renames, the client never knows what
2303 * file an open will affect. So it could avoid that situation
2304 * only by serializing all opens and IO from the same open
2305 * owner. To recover from the old_stateid error, the client
2306 * will just have to retry the IO:
2307 */
2308 if (in->si_generation < ref->si_generation)
2309 return nfserr_old_stateid;
2310 return nfs_ok;
2311}
2312
3e633079
BF		 2313static int is_delegation_stateid(stateid_t *stateid)
2314{
2315 return stateid->si_fileid == 0;
2316}
2317
1da177e4
LT		 2318/*
2319* Checks for stateid operations
2320*/
b37ad28b 2321__be32
1da177e4
LT		 2322nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2323{
2324 struct nfs4_stateid *stp = NULL;
2325 struct nfs4_delegation *dp = NULL;
1da177e4 2326 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2327 __be32 status;
1da177e4 2328
1da177e4
LT		 2329 if (filpp)
2330 *filpp = NULL;
2331
18f82731 2332 if (grace_disallows_io(ino))
1da177e4
LT		 2333 return nfserr_grace;
2334
2335 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2336 return check_special_stateids(current_fh, stateid, flags);
2337
1da177e4
LT		 2338 status = nfserr_stale_stateid;
2339 if (STALE_STATEID(stateid))
2340 goto out;
2341
1da177e4 2342 status = nfserr_bad_stateid;
3e633079 2343 if (is_delegation_stateid(stateid)) {
a4455be0 2344 dp = find_delegation_stateid(ino, stateid);
819a8f53 2345 if (!dp)
1da177e4 2346 goto out;
fd03b099 2347 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2348 if (status)
2349 goto out;
dc9bf700
BF		 2350 status = nfs4_check_delegmode(dp, flags);
2351 if (status)
2352 goto out;
2353 renew_client(dp->dl_client);
dc9bf700
BF		 2354 if (filpp)
2355 *filpp = dp->dl_vfs_file;
1da177e4 2356 } else { /* open or lock stateid */
a4455be0 2357 stp = find_stateid(stateid, flags);
819a8f53 2358 if (!stp)
1da177e4 2359 goto out;
6150ef0d 2360 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2361 goto out;
2362 if (!stp->st_stateowner->so_confirmed)
2363 goto out;
fd03b099 2364 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2365 if (status)
2366 goto out;
a4455be0
BF		 2367 status = nfs4_check_openmode(stp, flags);
2368 if (status)
1da177e4
LT		 2369 goto out;
2370 renew_client(stp->st_stateowner->so_client);
2371 if (filpp)
2372 *filpp = stp->st_vfs_file;
1da177e4
LT		 2373 }
2374 status = nfs_ok;
2375out:
2376 return status;
2377}
2378
4c4cd222
N		 2379static inline int
2380setlkflg (int type)
2381{
2382 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2383 RD_STATE : WR_STATE;
2384}
1da177e4
LT		 2385
2386/*
2387 * Checks for sequence id mutating operations.
2388 */
b37ad28b 2389static __be32
4c4cd222 2390nfs4_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 2391{
1da177e4
LT		 2392 struct nfs4_stateid *stp;
2393 struct nfs4_stateowner *sop;
0836f587 2394 __be32 status;
1da177e4
LT		 2395
2396 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2397 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2398 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2399 stateid->si_generation);
3a4f98bb 2400
1da177e4
LT		 2401 *stpp = NULL;
2402 *sopp = NULL;
2403
1da177e4 2404 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2405 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2406 return nfserr_bad_stateid;
1da177e4
LT		 2407 }
2408
1da177e4 2409 if (STALE_STATEID(stateid))
3a4f98bb 2410 return nfserr_stale_stateid;
1da177e4
LT		 2411 /*
2412 * We return BAD_STATEID if filehandle doesn't match stateid,
2413 * the confirmed flag is incorrecly set, or the generation
2414 * number is incorrect.
1da177e4 2415 */
f8816512
N		 2416 stp = find_stateid(stateid, flags);
2417 if (stp == NULL) {
2418 /*
2419 * Also, we should make sure this isn't just the result of
2420 * a replayed close:
2421 */
2422 sop = search_close_lru(stateid->si_stateownerid, flags);
2423 if (sop == NULL)
2424 return nfserr_bad_stateid;
2425 *sopp = sop;
2426 goto check_replay;
2427 }
1da177e4 2428
39325bd0
BF		 2429 *stpp = stp;
2430 *sopp = sop = stp->st_stateowner;
2431
4c4cd222 2432 if (lock) {
4c4cd222 2433 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2434 struct nfs4_client *clp = sop->so_client;
4c4cd222 2435 int lkflg = 0;
b37ad28b 2436 __be32 status;
4c4cd222
N		 2437
2438 lkflg = setlkflg(lock->lk_type);
2439
2440 if (lock->lk_is_new) {
599e0a22
BF		 2441 if (!sop->so_is_open_owner)
2442 return nfserr_bad_stateid;
2443 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2444 return nfserr_bad_stateid;
599e0a22
BF		 2445 /* stp is the open stateid */
2446 status = nfs4_check_openmode(stp, lkflg);
2447 if (status)
2448 return status;
2449 } else {
2450 /* stp is the lock stateid */
2451 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2452 if (status)
2453 return status;
4c4cd222 2454 }
1da177e4
LT		 2455 }
2456
f3362737 2457 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2458 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2459 return nfserr_bad_stateid;
1da177e4
LT		 2460 }
2461
1da177e4
LT		 2462 /*
2463 * We now validate the seqid and stateid generation numbers.
2464 * For the moment, we ignore the possibility of
2465 * generation number wraparound.
2466 */
bd9aac52 2467 if (seqid != sop->so_seqid)
1da177e4
LT		 2468 goto check_replay;
2469
3a4f98bb 2470 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2471 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2472 " unconfirmed stateowner!\n");
2473 return nfserr_bad_stateid;
1da177e4 2474 }
3a4f98bb 2475 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2476 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2477 " confirmed yet!\n");
2478 return nfserr_bad_stateid;
1da177e4 2479 }
0836f587
BF		 2480 status = check_stateid_generation(stateid, &stp->st_stateid);
2481 if (status)
2482 return status;
52fd004e 2483 renew_client(sop->so_client);
3a4f98bb 2484 return nfs_ok;
1da177e4 2485
1da177e4 2486check_replay:
bd9aac52 2487 if (seqid == sop->so_seqid - 1) {
849823c5 2488 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2489 /* indicate replay to calling function */
a90b061c 2490 return nfserr_replay_me;
1da177e4 2491 }
2fdada03 2492 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2493 sop->so_seqid, seqid);
2494 *sopp = NULL;
2495 return nfserr_bad_seqid;
1da177e4
LT		 2496}
2497
b37ad28b 2498__be32
ca364317 2499nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2500 struct nfsd4_open_confirm *oc)
1da177e4 2501{
b37ad28b 2502 __be32 status;
1da177e4
LT		 2503 struct nfs4_stateowner *sop;
2504 struct nfs4_stateid *stp;
2505
2506 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2507 (int)cstate->current_fh.fh_dentry->d_name.len,
2508 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2509
ca364317 2510 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2511 if (status)
2512 return status;
1da177e4
LT		 2513
2514 nfs4_lock_state();
2515
ca364317
BF		 2516 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2517 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2518 CONFIRM | OPEN_STATE,
1da177e4
LT		 2519 &oc->oc_stateowner, &stp, NULL)))
2520 goto out;
2521
2522 sop = oc->oc_stateowner;
2523 sop->so_confirmed = 1;
2524 update_stateid(&stp->st_stateid);
2525 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2526 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2527 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2528 stp->st_stateid.si_boot,
2529 stp->st_stateid.si_stateownerid,
2530 stp->st_stateid.si_fileid,
2531 stp->st_stateid.si_generation);
c7b9a459
N		 2532
2533 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2534out:
f2327d9a 2535 if (oc->oc_stateowner) {
1da177e4 2536 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2537 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2538 }
1da177e4
LT		 2539 nfs4_unlock_state();
2540 return status;
2541}
2542
2543
2544/*
2545 * unset all bits in union bitmap (bmap) that
2546 * do not exist in share (from successful OPEN_DOWNGRADE)
2547 */
2548static void
2549reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2550{
2551 int i;
2552 for (i = 1; i < 4; i++) {
2553 if ((i & access) != i)
2554 __clear_bit(i, bmap);
2555 }
2556}
2557
2558static void
2559reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2560{
2561 int i;
2562 for (i = 0; i < 4; i++) {
2563 if ((i & deny) != i)
2564 __clear_bit(i, bmap);
2565 }
2566}
2567
b37ad28b 2568__be32
ca364317
BF		 2569nfsd4_open_downgrade(struct svc_rqst *rqstp,
2570 struct nfsd4_compound_state *cstate,
a4f1706a 2571 struct nfsd4_open_downgrade *od)
1da177e4 2572{
b37ad28b 2573 __be32 status;
1da177e4
LT		 2574 struct nfs4_stateid *stp;
2575 unsigned int share_access;
2576
2577 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2578 (int)cstate->current_fh.fh_dentry->d_name.len,
2579 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2580
ba5a6a19
BF		 2581 if (!access_valid(od->od_share_access)
2582 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2583 return nfserr_inval;
2584
2585 nfs4_lock_state();
ca364317
BF		 2586 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2587 od->od_seqid,
1da177e4 2588 &od->od_stateid,
f3362737 2589 OPEN_STATE,
1da177e4
LT		 2590 &od->od_stateowner, &stp, NULL)))
2591 goto out;
2592
2593 status = nfserr_inval;
2594 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2595 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2596 stp->st_access_bmap, od->od_share_access);
2597 goto out;
2598 }
2599 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2600 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2601 stp->st_deny_bmap, od->od_share_deny);
2602 goto out;
2603 }
2604 set_access(&share_access, stp->st_access_bmap);
2605 nfs4_file_downgrade(stp->st_vfs_file,
2606 share_access & ~od->od_share_access);
2607
2608 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2609 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2610
2611 update_stateid(&stp->st_stateid);
2612 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2613 status = nfs_ok;
2614out:
f2327d9a 2615 if (od->od_stateowner) {
1da177e4 2616 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2617 cstate->replay_owner = od->od_stateowner;
f2327d9a 2618 }
1da177e4
LT		 2619 nfs4_unlock_state();
2620 return status;
2621}
2622
2623/*
2624 * nfs4_unlock_state() called after encode
2625 */
b37ad28b 2626__be32
ca364317 2627nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2628 struct nfsd4_close *close)
1da177e4 2629{
b37ad28b 2630 __be32 status;
1da177e4
LT		 2631 struct nfs4_stateid *stp;
2632
2633 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2634 (int)cstate->current_fh.fh_dentry->d_name.len,
2635 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2636
2637 nfs4_lock_state();
2638 /* check close_lru for replay */
ca364317
BF		 2639 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2640 close->cl_seqid,
1da177e4 2641 &close->cl_stateid,
f3362737 2642 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2643 &close->cl_stateowner, &stp, NULL)))
2644 goto out;
1da177e4
LT		 2645 status = nfs_ok;
2646 update_stateid(&stp->st_stateid);
2647 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2648
04ef5954 2649 /* release_stateid() calls nfsd_close() if needed */
2283963f 2650 release_open_stateid(stp);
04ef5954
BF		 2651
2652 /* place unused nfs4_stateowners on so_close_lru list to be
2653 * released by the laundromat service after the lease period
2654 * to enable us to handle CLOSE replay
2655 */
2656 if (list_empty(&close->cl_stateowner->so_stateids))
2657 move_to_close_lru(close->cl_stateowner);
1da177e4 2658out:
f2327d9a 2659 if (close->cl_stateowner) {
1da177e4 2660 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2661 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2662 }
1da177e4
LT		 2663 nfs4_unlock_state();
2664 return status;
2665}
2666
b37ad28b 2667__be32
ca364317
BF		 2668nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2669 struct nfsd4_delegreturn *dr)
1da177e4 2670{
203a8c8e
BF		 2671 struct nfs4_delegation *dp;
2672 stateid_t *stateid = &dr->dr_stateid;
2673 struct inode *inode;
b37ad28b 2674 __be32 status;
1da177e4 2675
ca364317 2676 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2677 return status;
2678 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2679
2680 nfs4_lock_state();
203a8c8e
BF		 2681 status = nfserr_bad_stateid;
2682 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2683 goto out;
2684 status = nfserr_stale_stateid;
2685 if (STALE_STATEID(stateid))
2686 goto out;
7e0f7cf5 2687 status = nfserr_bad_stateid;
203a8c8e
BF		 2688 if (!is_delegation_stateid(stateid))
2689 goto out;
203a8c8e
BF		 2690 dp = find_delegation_stateid(inode, stateid);
2691 if (!dp)
2692 goto out;
2693 status = check_stateid_generation(stateid, &dp->dl_stateid);
2694 if (status)
2695 goto out;
2696 renew_client(dp->dl_client);
2697
2698 unhash_delegation(dp);
1da177e4 2699out:
203a8c8e
BF		 2700 nfs4_unlock_state();
2701
1da177e4
LT		 2702 return status;
2703}
2704
2705
2706/*
2707 * Lock owner state (byte-range locks)
2708 */
2709#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2710#define LOCK_HASH_BITS 8
2711#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2712#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2713
87df4de8
BH		 2714static inline u64
2715end_offset(u64 start, u64 len)
2716{
2717 u64 end;
2718
2719 end = start + len;
2720 return end >= start ? end: NFS4_MAX_UINT64;
2721}
2722
2723/* last octet in a range */
2724static inline u64
2725last_byte_offset(u64 start, u64 len)
2726{
2727 u64 end;
2728
2729 BUG_ON(!len);
2730 end = start + len;
2731 return end > start ? end - 1: NFS4_MAX_UINT64;
2732}
2733
1da177e4
LT		 2734#define lockownerid_hashval(id) \
2735 ((id) & LOCK_HASH_MASK)
2736
2737static inline unsigned int
2738lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2739 struct xdr_netobj *ownername)
2740{
2741 return (file_hashval(inode) + cl_id
2742 + opaque_hashval(ownername->data, ownername->len))
2743 & LOCK_HASH_MASK;
2744}
2745
2746static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2747static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2748static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2749
fd39ca9a 2750static struct nfs4_stateid *
1da177e4
LT		 2751find_stateid(stateid_t *stid, int flags)
2752{
9346eff0 2753 struct nfs4_stateid *local;
1da177e4
LT		 2754 u32 st_id = stid->si_stateownerid;
2755 u32 f_id = stid->si_fileid;
2756 unsigned int hashval;
2757
2758 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2759 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2760 hashval = stateid_hashval(st_id, f_id);
2761 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2762 if ((local->st_stateid.si_stateownerid == st_id) &&
2763 (local->st_stateid.si_fileid == f_id))
2764 return local;
2765 }
2766 }
9346eff0
KK		 2767
2768 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2769 hashval = stateid_hashval(st_id, f_id);
2770 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2771 if ((local->st_stateid.si_stateownerid == st_id) &&
2772 (local->st_stateid.si_fileid == f_id))
2773 return local;
2774 }
849823c5 2775 }
1da177e4
LT		 2776 return NULL;
2777}
2778
2779static struct nfs4_delegation *
2780find_delegation_stateid(struct inode *ino, stateid_t *stid)
2781{
13cd2184
N		 2782 struct nfs4_file *fp;
2783 struct nfs4_delegation *dl;
1da177e4
LT		 2784
2785 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2786 stid->si_boot, stid->si_stateownerid,
2787 stid->si_fileid, stid->si_generation);
2788
1da177e4 2789 fp = find_file(ino);
13cd2184
N		 2790 if (!fp)
2791 return NULL;
2792 dl = find_delegation_file(fp, stid);
2793 put_nfs4_file(fp);
2794 return dl;
1da177e4
LT		 2795}
2796
2797/*
2798 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2799 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2800 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2801 * locking, this prevents us from being completely protocol-compliant. The
2802 * real solution to this problem is to start using unsigned file offsets in
2803 * the VFS, but this is a very deep change!
2804 */
2805static inline void
2806nfs4_transform_lock_offset(struct file_lock *lock)
2807{
2808 if (lock->fl_start < 0)
2809 lock->fl_start = OFFSET_MAX;
2810 if (lock->fl_end < 0)
2811 lock->fl_end = OFFSET_MAX;
2812}
2813
d5b9026a
N		 2814/* Hack!: For now, we're defining this just so we can use a pointer to it
2815 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2816static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2817};
1da177e4
LT		 2818
2819static inline void
2820nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2821{
d5b9026a
N		 2822 struct nfs4_stateowner *sop;
2823 unsigned int hval;
1da177e4 2824
d5b9026a
N		 2825 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2826 sop = (struct nfs4_stateowner *) fl->fl_owner;
2827 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2828 kref_get(&sop->so_ref);
2829 deny->ld_sop = sop;
2830 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2831 } else {
2832 deny->ld_sop = NULL;
2833 deny->ld_clientid.cl_boot = 0;
2834 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2835 }
2836 deny->ld_start = fl->fl_start;
87df4de8
BH		 2837 deny->ld_length = NFS4_MAX_UINT64;
2838 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2839 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2840 deny->ld_type = NFS4_READ_LT;
2841 if (fl->fl_type != F_RDLCK)
2842 deny->ld_type = NFS4_WRITE_LT;
2843}
2844
1da177e4
LT		 2845static struct nfs4_stateowner *
2846find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2847 struct xdr_netobj *owner)
2848{
2849 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2850 struct nfs4_stateowner *op;
2851
2852 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2853 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2854 return op;
2855 }
2856 return NULL;
2857}
2858
2859/*
2860 * Alloc a lock owner structure.
2861 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2862 * occured.
2863 *
2864 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2865 */
2866
2867static struct nfs4_stateowner *
2868alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2869 struct nfs4_stateowner *sop;
2870 struct nfs4_replay *rp;
2871 unsigned int idhashval;
2872
2873 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2874 return NULL;
2875 idhashval = lockownerid_hashval(current_ownerid);
2876 INIT_LIST_HEAD(&sop->so_idhash);
2877 INIT_LIST_HEAD(&sop->so_strhash);
2878 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2879 INIT_LIST_HEAD(&sop->so_stateids);
2880 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2881 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2882 sop->so_time = 0;
2883 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2884 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2885 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2886 sop->so_is_open_owner = 0;
2887 sop->so_id = current_ownerid++;
2888 sop->so_client = clp;
b59e3c0e
NB		 2889 /* It is the openowner seqid that will be incremented in encode in the
2890 * case of new lockowners; so increment the lock seqid manually: */
2891 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2892 sop->so_confirmed = 1;
2893 rp = &sop->so_replay;
de1ae286 2894 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2895 rp->rp_buflen = 0;
2896 rp->rp_buf = rp->rp_ibuf;
2897 return sop;
2898}
2899
fd39ca9a 2900static struct nfs4_stateid *
1da177e4
LT		 2901alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2902{
2903 struct nfs4_stateid *stp;
2904 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2905
5ac049ac
N		 2906 stp = nfs4_alloc_stateid();
2907 if (stp == NULL)
1da177e4
LT		 2908 goto out;
2909 INIT_LIST_HEAD(&stp->st_hash);
2910 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2911 INIT_LIST_HEAD(&stp->st_perstateowner);
2912 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2913 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2914 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2915 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2916 stp->st_stateowner = sop;
13cd2184 2917 get_nfs4_file(fp);
1da177e4
LT		 2918 stp->st_file = fp;
2919 stp->st_stateid.si_boot = boot_time;
2920 stp->st_stateid.si_stateownerid = sop->so_id;
2921 stp->st_stateid.si_fileid = fp->fi_id;
2922 stp->st_stateid.si_generation = 0;
2923 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2924 stp->st_access_bmap = open_stp->st_access_bmap;
2925 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2926 stp->st_openstp = open_stp;
1da177e4
LT		 2927
2928out:
2929 return stp;
2930}
2931
fd39ca9a 2932static int
1da177e4
LT		 2933check_lock_length(u64 offset, u64 length)
2934{
87df4de8 2935 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2936 LOFF_OVERFLOW(offset, length)));
2937}
2938
2939/*
2940 * LOCK operation
2941 */
b37ad28b 2942__be32
ca364317 2943nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2944 struct nfsd4_lock *lock)
1da177e4 2945{
3e9e3dbe 2946 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2947 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2948 struct nfs4_stateid *lock_stp;
2949 struct file *filp;
2950 struct file_lock file_lock;
8dc7c311 2951 struct file_lock conflock;
b37ad28b 2952 __be32 status = 0;
1da177e4 2953 unsigned int strhashval;
150b3934 2954 unsigned int cmd;
b8dd7b9a 2955 int err;
1da177e4
LT		 2956
2957 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2958 (long long) lock->lk_offset,
2959 (long long) lock->lk_length);
2960
1da177e4
LT		 2961 if (check_lock_length(lock->lk_offset, lock->lk_length))
2962 return nfserr_inval;
2963
ca364317 2964 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2965 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2966 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2967 return status;
2968 }
2969
1da177e4
LT		 2970 nfs4_lock_state();
2971
2972 if (lock->lk_is_new) {
893f8770
N		 2973 /*
2974 * Client indicates that this is a new lockowner.
2975 * Use open owner and open stateid to create lock owner and
2976 * lock stateid.
2977 */
1da177e4
LT		 2978 struct nfs4_stateid *open_stp = NULL;
2979 struct nfs4_file *fp;
2980
2981 status = nfserr_stale_clientid;
849823c5 2982 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2983 goto out;
1da177e4 2984
1da177e4 2985 /* validate and update open stateid and open seqid */
ca364317 2986 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2987 lock->lk_new_open_seqid,
2988 &lock->lk_new_open_stateid,
f3362737 2989 OPEN_STATE,
3a65588a 2990 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2991 lock);
37515177 2992 if (status)
1da177e4 2993 goto out;
3a65588a 2994 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2995 /* create lockowner and lock stateid */
2996 fp = open_stp->st_file;
2997 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2998 open_sop->so_client->cl_clientid.cl_id,
2999 &lock->v.new.owner);
3e9e3dbe
N		 3000 /* XXX: Do we need to check for duplicate stateowners on
3001 * the same file, or should they just be allowed (and
3002 * create new stateids)? */
1da177e4 3003 status = nfserr_resource;
b59e3c0e
NB		 3004 lock_sop = alloc_init_lock_stateowner(strhashval,
3005 open_sop->so_client, open_stp, lock);
3006 if (lock_sop == NULL)
1da177e4 3007 goto out;
b59e3c0e 3008 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3009 if (lock_stp == NULL)
1da177e4 3010 goto out;
1da177e4
LT		 3011 } else {
3012 /* lock (lock owner + lock stateid) already exists */
ca364317 3013 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3014 lock->lk_old_lock_seqid,
3015 &lock->lk_old_lock_stateid,
f3362737 3016 LOCK_STATE,
3a65588a 3017 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3018 if (status)
3019 goto out;
3a65588a 3020 lock_sop = lock->lk_replay_owner;
1da177e4 3021 }
3a65588a 3022 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3023 filp = lock_stp->st_vfs_file;
3024
0dd395dc 3025 status = nfserr_grace;
af558e33 3026 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3027 goto out;
3028 status = nfserr_no_grace;
af558e33 3029 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3030 goto out;
3031
1da177e4
LT		 3032 locks_init_lock(&file_lock);
3033 switch (lock->lk_type) {
3034 case NFS4_READ_LT:
3035 case NFS4_READW_LT:
3036 file_lock.fl_type = F_RDLCK;
150b3934 3037 cmd = F_SETLK;
1da177e4
LT		 3038 break;
3039 case NFS4_WRITE_LT:
3040 case NFS4_WRITEW_LT:
3041 file_lock.fl_type = F_WRLCK;
150b3934 3042 cmd = F_SETLK;
1da177e4
LT		 3043 break;
3044 default:
3045 status = nfserr_inval;
3046 goto out;
3047 }
b59e3c0e 3048 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3049 file_lock.fl_pid = current->tgid;
3050 file_lock.fl_file = filp;
3051 file_lock.fl_flags = FL_POSIX;
d5b9026a 3052 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3053
3054 file_lock.fl_start = lock->lk_offset;
87df4de8 3055 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3056 nfs4_transform_lock_offset(&file_lock);
3057
3058 /*
3059 * Try to lock the file in the VFS.
3060 * Note: locks.c uses the BKL to protect the inode's lock list.
3061 */
3062
fd85b817 3063 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3064 switch (-err) {
1da177e4
LT		 3065 case 0: /* success! */
3066 update_stateid(&lock_stp->st_stateid);
3067 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3068 sizeof(stateid_t));
b8dd7b9a 3069 status = 0;
eb76b3fd
AA		 3070 break;
3071 case (EAGAIN): /* conflock holds conflicting lock */
3072 status = nfserr_denied;
3073 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3074 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3075 break;
1da177e4
LT		 3076 case (EDEADLK):
3077 status = nfserr_deadlock;
eb76b3fd 3078 break;
1da177e4 3079 default:
fd85b817 3080 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3081 status = nfserr_resource;
3082 break;
1da177e4 3083 }
1da177e4 3084out:
8a280510 3085 if (status && lock->lk_is_new && lock_sop)
f044ff83 3086 release_lockowner(lock_sop);
3a65588a
BF		 3087 if (lock->lk_replay_owner) {
3088 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3089 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3090 }
1da177e4
LT		 3091 nfs4_unlock_state();
3092 return status;
3093}
3094
55ef1274
BF		 3095/*
3096 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3097 * so we do a temporary open here just to get an open file to pass to
3098 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3099 * inode operation.)
3100 */
3101static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3102{
3103 struct file *file;
3104 int err;
3105
3106 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3107 if (err)
3108 return err;
3109 err = vfs_test_lock(file, lock);
3110 nfsd_close(file);
3111 return err;
3112}
3113
1da177e4
LT		 3114/*
3115 * LOCKT operation
3116 */
b37ad28b 3117__be32
ca364317
BF		 3118nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3119 struct nfsd4_lockt *lockt)
1da177e4
LT		 3120{
3121 struct inode *inode;
1da177e4 3122 struct file_lock file_lock;
fd85b817 3123 int error;
b37ad28b 3124 __be32 status;
1da177e4 3125
af558e33 3126 if (locks_in_grace())
1da177e4
LT		 3127 return nfserr_grace;
3128
3129 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3130 return nfserr_inval;
3131
3132 lockt->lt_stateowner = NULL;
3133 nfs4_lock_state();
3134
3135 status = nfserr_stale_clientid;
849823c5 3136 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3137 goto out;
1da177e4 3138
ca364317 3139 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3140 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3141 if (status == nfserr_symlink)
3142 status = nfserr_inval;
3143 goto out;
3144 }
3145
ca364317 3146 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3147 locks_init_lock(&file_lock);
3148 switch (lockt->lt_type) {
3149 case NFS4_READ_LT:
3150 case NFS4_READW_LT:
3151 file_lock.fl_type = F_RDLCK;
3152 break;
3153 case NFS4_WRITE_LT:
3154 case NFS4_WRITEW_LT:
3155 file_lock.fl_type = F_WRLCK;
3156 break;
3157 default:
2fdada03 3158 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3159 status = nfserr_inval;
3160 goto out;
3161 }
3162
3163 lockt->lt_stateowner = find_lockstateowner_str(inode,
3164 &lockt->lt_clientid, &lockt->lt_owner);
3165 if (lockt->lt_stateowner)
3166 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3167 file_lock.fl_pid = current->tgid;
3168 file_lock.fl_flags = FL_POSIX;
3169
3170 file_lock.fl_start = lockt->lt_offset;
87df4de8 3171 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3172
3173 nfs4_transform_lock_offset(&file_lock);
3174
1da177e4 3175 status = nfs_ok;
55ef1274 3176 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3177 if (error) {
3178 status = nfserrno(error);
3179 goto out;
3180 }
9d6a8c5c 3181 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3182 status = nfserr_denied;
9d6a8c5c 3183 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3184 }
3185out:
3186 nfs4_unlock_state();
3187 return status;
3188}
3189
b37ad28b 3190__be32
ca364317 3191nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3192 struct nfsd4_locku *locku)
1da177e4
LT		 3193{
3194 struct nfs4_stateid *stp;
3195 struct file *filp = NULL;
3196 struct file_lock file_lock;
b37ad28b 3197 __be32 status;
b8dd7b9a 3198 int err;
1da177e4
LT		 3199
3200 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3201 (long long) locku->lu_offset,
3202 (long long) locku->lu_length);
3203
3204 if (check_lock_length(locku->lu_offset, locku->lu_length))
3205 return nfserr_inval;
3206
3207 nfs4_lock_state();
3208
ca364317 3209 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3210 locku->lu_seqid,
3211 &locku->lu_stateid,
f3362737 3212 LOCK_STATE,
1da177e4
LT		 3213 &locku->lu_stateowner, &stp, NULL)))
3214 goto out;
3215
3216 filp = stp->st_vfs_file;
3217 BUG_ON(!filp);
3218 locks_init_lock(&file_lock);
3219 file_lock.fl_type = F_UNLCK;
3220 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3221 file_lock.fl_pid = current->tgid;
3222 file_lock.fl_file = filp;
3223 file_lock.fl_flags = FL_POSIX;
d5b9026a 3224 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3225 file_lock.fl_start = locku->lu_offset;
3226
87df4de8 3227 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3228 nfs4_transform_lock_offset(&file_lock);
3229
3230 /*
3231 * Try to unlock the file in the VFS.
3232 */
fd85b817 3233 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3234 if (err) {
fd85b817 3235 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3236 goto out_nfserr;
3237 }
3238 /*
3239 * OK, unlock succeeded; the only thing left to do is update the stateid.
3240 */
3241 update_stateid(&stp->st_stateid);
3242 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3243
3244out:
f2327d9a 3245 if (locku->lu_stateowner) {
1da177e4 3246 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3247 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3248 }
1da177e4
LT		 3249 nfs4_unlock_state();
3250 return status;
3251
3252out_nfserr:
b8dd7b9a 3253 status = nfserrno(err);
1da177e4
LT		 3254 goto out;
3255}
3256
3257/*
3258 * returns
3259 * 1: locks held by lockowner
3260 * 0: no locks held by lockowner
3261 */
3262static int
3263check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3264{
3265 struct file_lock **flpp;
7eaa36e2 3266 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3267 int status = 0;
3268
3269 lock_kernel();
3270 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3271 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3272 status = 1;
3273 goto out;
796dadfd 3274 }
1da177e4
LT		 3275 }
3276out:
3277 unlock_kernel();
3278 return status;
3279}
3280
b37ad28b 3281__be32
b591480b
BF		 3282nfsd4_release_lockowner(struct svc_rqst *rqstp,
3283 struct nfsd4_compound_state *cstate,
3284 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3285{
3286 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3287 struct nfs4_stateowner *sop;
3288 struct nfs4_stateid *stp;
1da177e4 3289 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3290 struct list_head matches;
3291 int i;
b37ad28b 3292 __be32 status;
1da177e4
LT		 3293
3294 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3295 clid->cl_boot, clid->cl_id);
3296
3297 /* XXX check for lease expiration */
3298
3299 status = nfserr_stale_clientid;
849823c5 3300 if (STALE_CLIENTID(clid))
1da177e4 3301 return status;
1da177e4
LT		 3302
3303 nfs4_lock_state();
3304
3e9e3dbe
N		 3305 status = nfserr_locks_held;
3306 /* XXX: we're doing a linear search through all the lockowners.
3307 * Yipes! For now we'll just hope clients aren't really using
3308 * release_lockowner much, but eventually we have to fix these
3309 * data structures. */
3310 INIT_LIST_HEAD(&matches);
3311 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3312 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3313 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3314 continue;
3315 list_for_each_entry(stp, &sop->so_stateids,
3316 st_perstateowner) {
3317 if (check_for_locks(stp->st_vfs_file, sop))
3318 goto out;
3319 /* Note: so_perclient unused for lockowners,
3320 * so it's OK to fool with here. */
3321 list_add(&sop->so_perclient, &matches);
3322 }
1da177e4 3323 }
3e9e3dbe
N		 3324 }
3325 /* Clients probably won't expect us to return with some (but not all)
3326 * of the lockowner state released; so don't release any until all
3327 * have been checked. */
3328 status = nfs_ok;
0fa822e4
N		 3329 while (!list_empty(&matches)) {
3330 sop = list_entry(matches.next, struct nfs4_stateowner,
3331 so_perclient);
3332 /* unhash_stateowner deletes so_perclient only
3333 * for openowners. */
3334 list_del(&sop->so_perclient);
f044ff83 3335 release_lockowner(sop);
1da177e4
LT		 3336 }
3337out:
3338 nfs4_unlock_state();
3339 return status;
3340}
3341
3342static inline struct nfs4_client_reclaim *
a55370a3 3343alloc_reclaim(void)
1da177e4 3344{
a55370a3 3345 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3346}
3347
c7b9a459 3348int
a1bcecd2 3349nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3350{
3351 unsigned int strhashval = clientstr_hashval(name);
3352 struct nfs4_client *clp;
3353
a1bcecd2 3354 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3355 return clp ? 1 : 0;
3356}
3357
1da177e4
LT		 3358/*
3359 * failure => all reset bets are off, nfserr_no_grace...
3360 */
190e4fbf
N		 3361int
3362nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3363{
3364 unsigned int strhashval;
3365 struct nfs4_client_reclaim *crp = NULL;
3366
a55370a3
N		 3367 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3368 crp = alloc_reclaim();
1da177e4
LT		 3369 if (!crp)
3370 return 0;
a55370a3 3371 strhashval = clientstr_hashval(name);
1da177e4
LT		 3372 INIT_LIST_HEAD(&crp->cr_strhash);
3373 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3374 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3375 reclaim_str_hashtbl_size++;
3376 return 1;
3377}
3378
3379static void
3380nfs4_release_reclaim(void)
3381{
3382 struct nfs4_client_reclaim *crp = NULL;
3383 int i;
3384
1da177e4
LT		 3385 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3386 while (!list_empty(&reclaim_str_hashtbl[i])) {
3387 crp = list_entry(reclaim_str_hashtbl[i].next,
3388 struct nfs4_client_reclaim, cr_strhash);
3389 list_del(&crp->cr_strhash);
1da177e4
LT		 3390 kfree(crp);
3391 reclaim_str_hashtbl_size--;
3392 }
3393 }
3394 BUG_ON(reclaim_str_hashtbl_size);
3395}
3396
3397/*
3398 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3399static struct nfs4_client_reclaim *
1da177e4
LT		 3400nfs4_find_reclaim_client(clientid_t *clid)
3401{
3402 unsigned int strhashval;
3403 struct nfs4_client *clp;
3404 struct nfs4_client_reclaim *crp = NULL;
3405
3406
3407 /* find clientid in conf_id_hashtbl */
3408 clp = find_confirmed_client(clid);
3409 if (clp == NULL)
3410 return NULL;
3411
a55370a3
N		 3412 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3413 clp->cl_name.len, clp->cl_name.data,
3414 clp->cl_recdir);
1da177e4
LT		 3415
3416 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3417 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3418 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3419 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3420 return crp;
3421 }
3422 }
3423 return NULL;
3424}
3425
3426/*
3427* Called from OPEN. Look for clientid in reclaim list.
3428*/
b37ad28b 3429__be32
1da177e4
LT		 3430nfs4_check_open_reclaim(clientid_t *clid)
3431{
dfc83565 3432 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3433}
3434
ac4d8ff2 3435/* initialization to perform at module load time: */
1da177e4 3436
e8ff2a84 3437int
ac4d8ff2 3438nfs4_state_init(void)
1da177e4 3439{
e8ff2a84 3440 int i, status;
1da177e4 3441
e8ff2a84
BF		 3442 status = nfsd4_init_slabs();
3443 if (status)
3444 return status;
1da177e4
LT		 3445 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3446 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3447 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3448 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3449 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3450 }
5282fd72
ME		 3451 for (i = 0; i < SESSION_HASH_SIZE; i++)
3452 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3453 for (i = 0; i < FILE_HASH_SIZE; i++) {
3454 INIT_LIST_HEAD(&file_hashtbl[i]);
3455 }
3456 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3457 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3458 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3459 }
3460 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3461 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3462 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3463 }
3464 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3465 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3466 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3467 }
1da177e4 3468 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3469 INIT_LIST_HEAD(&close_lru);
3470 INIT_LIST_HEAD(&client_lru);
3471 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3472 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3473 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3474 reclaim_str_hashtbl_size = 0;
e8ff2a84 3475 return 0;
ac4d8ff2
N		 3476}
3477
190e4fbf
N		 3478static void
3479nfsd4_load_reboot_recovery_data(void)
3480{
3481 int status;
3482
0964a3d3
N		 3483 nfs4_lock_state();
3484 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3485 status = nfsd4_recdir_load();
0964a3d3 3486 nfs4_unlock_state();
190e4fbf
N		 3487 if (status)
3488 printk("NFSD: Failure reading reboot recovery data\n");
3489}
3490
9a8db97e
ME		 3491unsigned long
3492get_nfs4_grace_period(void)
3493{
3494 return max(user_lease_time, lease_time) * HZ;
3495}
3496
c2f1a551
MS		 3497/*
3498 * Since the lifetime of a delegation isn't limited to that of an open, a
3499 * client may quite reasonably hang on to a delegation as long as it has
3500 * the inode cached. This becomes an obvious problem the first time a
3501 * client's inode cache approaches the size of the server's total memory.
3502 *
3503 * For now we avoid this problem by imposing a hard limit on the number
3504 * of delegations, which varies according to the server's memory size.
3505 */
3506static void
3507set_max_delegations(void)
3508{
3509 /*
3510 * Allow at most 4 delegations per megabyte of RAM. Quick
3511 * estimates suggest that in the worst case (where every delegation
3512 * is for a different inode), a delegation could take about 1.5K,
3513 * giving a worst case usage of about 6% of memory.
3514 */
3515 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3516}
3517
ac4d8ff2
N		 3518/* initialization to perform when the nfsd service is started: */
3519
3520static void
3521__nfs4_state_start(void)
3522{
9a8db97e 3523 unsigned long grace_time;
ac4d8ff2 3524
1da177e4 3525 boot_time = get_seconds();
af558e33 3526 grace_time = get_nfs4_grace_period();
d99a05ad 3527 lease_time = user_lease_time;
af558e33 3528 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3529 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3530 grace_time/HZ);
58da282b 3531 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3532 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3533 set_max_delegations();
1da177e4
LT		 3534}
3535
e8ff2a84 3536void
76a3550e 3537nfs4_state_start(void)
1da177e4 3538{
1da177e4 3539 if (nfs4_init)
e8ff2a84 3540 return;
190e4fbf 3541 nfsd4_load_reboot_recovery_data();
76a3550e 3542 __nfs4_state_start();
1da177e4 3543 nfs4_init = 1;
e8ff2a84 3544 return;
1da177e4
LT		 3545}
3546
1da177e4
LT		 3547time_t
3548nfs4_lease_time(void)
3549{
3550 return lease_time;
3551}
3552
3553static void
3554__nfs4_state_shutdown(void)
3555{
3556 int i;
3557 struct nfs4_client *clp = NULL;
3558 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3559 struct list_head *pos, *next, reaplist;
3560
1da177e4
LT		 3561 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3562 while (!list_empty(&conf_id_hashtbl[i])) {
3563 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3564 expire_client(clp);
3565 }
3566 while (!list_empty(&unconf_str_hashtbl[i])) {
3567 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3568 expire_client(clp);
3569 }
3570 }
3571 INIT_LIST_HEAD(&reaplist);
3572 spin_lock(&recall_lock);
3573 list_for_each_safe(pos, next, &del_recall_lru) {
3574 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3575 list_move(&dp->dl_recall_lru, &reaplist);
3576 }
3577 spin_unlock(&recall_lock);
3578 list_for_each_safe(pos, next, &reaplist) {
3579 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3580 list_del_init(&dp->dl_recall_lru);
3581 unhash_delegation(dp);
3582 }
3583
190e4fbf 3584 nfsd4_shutdown_recdir();
1da177e4 3585 nfs4_init = 0;
1da177e4
LT		 3586}
3587
3588void
3589nfs4_state_shutdown(void)
3590{
5e8d5c29
N		 3591 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3592 destroy_workqueue(laundry_wq);
2c5e7615 3593 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3594 nfs4_lock_state();
3595 nfs4_release_reclaim();
3596 __nfs4_state_shutdown();
1da177e4
LT		 3597 nfs4_unlock_state();
3598}
3599
3dd98a3b
JL		 3600/*
3601 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3602 * accessed when nfsd is starting.
3603 */
0964a3d3
N		 3604static void
3605nfs4_set_recdir(char *recdir)
3606{
0964a3d3 3607 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3608}
3609
3610/*
3611 * Change the NFSv4 recovery directory to recdir.
3612 */
3613int
3614nfs4_reset_recoverydir(char *recdir)
3615{
3616 int status;
a63bb996 3617 struct path path;
0964a3d3 3618
a63bb996 3619 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3620 if (status)
3621 return status;
3622 status = -ENOTDIR;
a63bb996 3623 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3624 nfs4_set_recdir(recdir);
3625 status = 0;
3626 }
a63bb996 3627 path_put(&path);
0964a3d3
N		 3628 return status;
3629}
3630
3dd98a3b
JL		 3631char *
3632nfs4_recoverydir(void)
3633{
3634 return user_recovery_dirname;
3635}
3636
1da177e4
LT		 3637/*
3638 * Called when leasetime is changed.
3639 *
d99a05ad
N		 3640 * The only way the protocol gives us to handle on-the-fly lease changes is to
3641 * simulate a reboot. Instead of doing that, we just wait till the next time
3642 * we start to register any changes in lease time. If the administrator
3643 * really wants to change the lease time *now*, they can go ahead and bring
3644 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3645 *
3646 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3647 * when nfsd is starting
1da177e4
LT		 3648 */
3649void
3650nfs4_reset_lease(time_t leasetime)
3651{
d99a05ad 3652 user_lease_time = leasetime;
1da177e4 3653}
Linux 6.x block layer and io_uring tree(s)