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[linux-2.6-block.git] / fs / nfsd / nfs4state.c
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1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4 80
8b671b80
BF		 81/* Locking: */
82
83/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 84static DEFINE_MUTEX(client_mutex);
1da177e4 85
8b671b80
BF		 86/*
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
90 */
91static DEFINE_SPINLOCK(recall_lock);
92
e18b890b
CL		 93static struct kmem_cache *stateowner_slab = NULL;
94static struct kmem_cache *file_slab = NULL;
95static struct kmem_cache *stateid_slab = NULL;
96static struct kmem_cache *deleg_slab = NULL;
e60d4398 97
1da177e4
LT		 98void
99nfs4_lock_state(void)
100{
353ab6e9 101 mutex_lock(&client_mutex);
1da177e4
LT		 102}
103
104void
105nfs4_unlock_state(void)
106{
353ab6e9 107 mutex_unlock(&client_mutex);
1da177e4
LT		 108}
109
110static inline u32
111opaque_hashval(const void *ptr, int nbytes)
112{
113 unsigned char *cptr = (unsigned char *) ptr;
114
115 u32 x = 0;
116 while (nbytes--) {
117 x *= 37;
118 x += *cptr++;
119 }
120 return x;
121}
122
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static inline void
126put_nfs4_file(struct nfs4_file *fi)
127{
8b671b80
BF		 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
131 iput(fi->fi_inode);
132 kmem_cache_free(file_slab, fi);
133 }
13cd2184
N		 134}
135
136static inline void
137get_nfs4_file(struct nfs4_file *fi)
138{
8b671b80 139 atomic_inc(&fi->fi_ref);
13cd2184
N		 140}
141
ef0f3390 142static int num_delegations;
c2f1a551 143unsigned int max_delegations;
ef0f3390
N		 144
145/*
146 * Open owner state (share locks)
147 */
148
149/* hash tables for nfs4_stateowner */
150#define OWNER_HASH_BITS 8
151#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
153
154#define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156#define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
158
159static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
161
162/* hash table for nfs4_file */
163#define FILE_HASH_BITS 8
164#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166/* hash table for (open)nfs4_stateid */
167#define STATEID_HASH_BITS 10
168#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
170
171#define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173#define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
175
176static struct list_head file_hashtbl[FILE_HASH_SIZE];
177static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
178
1da177e4
LT		 179static struct nfs4_delegation *
180alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
181{
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
185
186 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 187 if (fp->fi_had_conflict)
188 return NULL;
c2f1a551 189 if (num_delegations > max_delegations)
ef0f3390 190 return NULL;
5b2d21c1
N		 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
192 if (dp == NULL)
1da177e4 193 return dp;
ef0f3390 194 num_delegations++;
ea1da636
N		 195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 197 INIT_LIST_HEAD(&dp->dl_recall_lru);
198 dp->dl_client = clp;
13cd2184 199 get_nfs4_file(fp);
1da177e4
LT		 200 dp->dl_file = fp;
201 dp->dl_flock = NULL;
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
204 dp->dl_type = type;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
5282fd72
ME		 385static DEFINE_SPINLOCK(sessionid_lock);
386#define SESSION_HASH_SIZE 512
387static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
388
389static inline int
390hash_sessionid(struct nfs4_sessionid *sessionid)
391{
392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
393
394 return sid->sequence % SESSION_HASH_SIZE;
395}
396
397static inline void
398dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
399{
400 u32 *ptr = (u32 *)(&sessionid->data[0]);
401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
402}
403
404/* caller must hold sessionid_lock */
405static struct nfsd4_session *
406find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
407{
408 struct nfsd4_session *elem;
409 int idx;
410
411 dump_sessionid(__func__, sessionid);
412 idx = hash_sessionid(sessionid);
413 dprintk("%s: idx is %d\n", __func__, idx);
414 /* Search in the appropriate list */
415 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
416 dump_sessionid("list traversal", &elem->se_sessionid);
417 if (!memcmp(elem->se_sessionid.data, sessionid->data,
418 NFS4_MAX_SESSIONID_LEN)) {
419 return elem;
420 }
421 }
422
423 dprintk("%s: session not found\n", __func__);
424 return NULL;
425}
426
427/* caller must hold sessionid_lock */
7116ed6b 428static void
5282fd72 429unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 430{
431 list_del(&ses->se_hash);
432 list_del(&ses->se_perclnt);
5282fd72
ME		 433}
434
435static void
436release_session(struct nfsd4_session *ses)
437{
438 spin_lock(&sessionid_lock);
439 unhash_session(ses);
440 spin_unlock(&sessionid_lock);
7116ed6b
AA		 441 nfsd4_put_session(ses);
442}
443
444void
445free_session(struct kref *kref)
446{
447 struct nfsd4_session *ses;
448
449 ses = container_of(kref, struct nfsd4_session, se_ref);
450 kfree(ses->se_slots);
451 kfree(ses);
452}
453
1da177e4
LT		 454static inline void
455renew_client(struct nfs4_client *clp)
456{
457 /*
458 * Move client to the end to the LRU list.
459 */
460 dprintk("renewing client (clientid %08x/%08x)\n",
461 clp->cl_clientid.cl_boot,
462 clp->cl_clientid.cl_id);
463 list_move_tail(&clp->cl_lru, &client_lru);
464 clp->cl_time = get_seconds();
465}
466
467/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
468static int
469STALE_CLIENTID(clientid_t *clid)
470{
471 if (clid->cl_boot == boot_time)
472 return 0;
473 dprintk("NFSD stale clientid (%08x/%08x)\n",
474 clid->cl_boot, clid->cl_id);
475 return 1;
476}
477
478/*
479 * XXX Should we use a slab cache ?
480 * This type of memory management is somewhat inefficient, but we use it
481 * anyway since SETCLIENTID is not a common operation.
482 */
35bba9a3 483static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 484{
485 struct nfs4_client *clp;
486
35bba9a3
BF		 487 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
488 if (clp == NULL)
489 return NULL;
490 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
491 if (clp->cl_name.data == NULL) {
492 kfree(clp);
493 return NULL;
1da177e4 494 }
35bba9a3
BF		 495 memcpy(clp->cl_name.data, name.data, name.len);
496 clp->cl_name.len = name.len;
1da177e4
LT		 497 return clp;
498}
499
1b1a9b31
BF		 500static void
501shutdown_callback_client(struct nfs4_client *clp)
502{
503 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
504
1b1a9b31 505 if (clnt) {
404ec117
BF		 506 /*
507 * Callback threads take a reference on the client, so there
508 * should be no outstanding callbacks at this point.
509 */
1b1a9b31
BF		 510 clp->cl_callback.cb_client = NULL;
511 rpc_shutdown_client(clnt);
512 }
513}
514
1da177e4
LT		 515static inline void
516free_client(struct nfs4_client *clp)
517{
1b1a9b31 518 shutdown_callback_client(clp);
1da177e4
LT		 519 if (clp->cl_cred.cr_group_info)
520 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 521 kfree(clp->cl_principal);
1da177e4
LT		 522 kfree(clp->cl_name.data);
523 kfree(clp);
524}
525
526void
527put_nfs4_client(struct nfs4_client *clp)
528{
529 if (atomic_dec_and_test(&clp->cl_count))
530 free_client(clp);
531}
532
533static void
534expire_client(struct nfs4_client *clp)
535{
536 struct nfs4_stateowner *sop;
537 struct nfs4_delegation *dp;
1da177e4
LT		 538 struct list_head reaplist;
539
540 dprintk("NFSD: expire_client cl_count %d\n",
541 atomic_read(&clp->cl_count));
542
1da177e4
LT		 543 INIT_LIST_HEAD(&reaplist);
544 spin_lock(&recall_lock);
ea1da636
N		 545 while (!list_empty(&clp->cl_delegations)) {
546 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 547 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
548 dp->dl_flock);
ea1da636 549 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 550 list_move(&dp->dl_recall_lru, &reaplist);
551 }
552 spin_unlock(&recall_lock);
553 while (!list_empty(&reaplist)) {
554 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
555 list_del_init(&dp->dl_recall_lru);
556 unhash_delegation(dp);
557 }
558 list_del(&clp->cl_idhash);
559 list_del(&clp->cl_strhash);
560 list_del(&clp->cl_lru);
ea1da636
N		 561 while (!list_empty(&clp->cl_openowners)) {
562 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 563 release_openowner(sop);
1da177e4 564 }
c4bf7868
ME		 565 while (!list_empty(&clp->cl_sessions)) {
566 struct nfsd4_session *ses;
567 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
568 se_perclnt);
569 release_session(ses);
570 }
1da177e4
LT		 571 put_nfs4_client(clp);
572}
573
35bba9a3
BF		 574static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
575{
1da177e4
LT		 576 struct nfs4_client *clp;
577
35bba9a3
BF		 578 clp = alloc_client(name);
579 if (clp == NULL)
580 return NULL;
a55370a3 581 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 582 atomic_set(&clp->cl_count, 1);
583 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 584 INIT_LIST_HEAD(&clp->cl_idhash);
585 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 586 INIT_LIST_HEAD(&clp->cl_openowners);
587 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 588 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 589 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 590 return clp;
591}
592
35bba9a3
BF		 593static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
594{
595 memcpy(target->cl_verifier.data, source->data,
596 sizeof(target->cl_verifier.data));
1da177e4
LT		 597}
598
35bba9a3
BF		 599static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
600{
1da177e4
LT		 601 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
602 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
603}
604
35bba9a3
BF		 605static void copy_cred(struct svc_cred *target, struct svc_cred *source)
606{
1da177e4
LT		 607 target->cr_uid = source->cr_uid;
608 target->cr_gid = source->cr_gid;
609 target->cr_group_info = source->cr_group_info;
610 get_group_info(target->cr_group_info);
611}
612
35bba9a3 613static int same_name(const char *n1, const char *n2)
599e0a22 614{
a55370a3 615 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 616}
617
618static int
599e0a22
BF		 619same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
620{
621 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 622}
623
624static int
599e0a22
BF		 625same_clid(clientid_t *cl1, clientid_t *cl2)
626{
627 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 628}
629
630/* XXX what about NGROUP */
631static int
599e0a22
BF		 632same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
633{
634 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 635}
636
5ec7b46c
BF		 637static void gen_clid(struct nfs4_client *clp)
638{
639 static u32 current_clientid = 1;
640
1da177e4
LT		 641 clp->cl_clientid.cl_boot = boot_time;
642 clp->cl_clientid.cl_id = current_clientid++;
643}
644
deda2faa
BF		 645static void gen_confirm(struct nfs4_client *clp)
646{
647 static u32 i;
648 u32 *p;
1da177e4 649
1da177e4 650 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 651 *p++ = get_seconds();
652 *p++ = i++;
1da177e4
LT		 653}
654
35bba9a3
BF		 655static int check_name(struct xdr_netobj name)
656{
1da177e4
LT		 657 if (name.len == 0)
658 return 0;
659 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 660 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 661 return 0;
662 }
663 return 1;
664}
665
fd39ca9a 666static void
1da177e4
LT		 667add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
668{
669 unsigned int idhashval;
670
671 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
672 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
673 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
674 list_add_tail(&clp->cl_lru, &client_lru);
675 clp->cl_time = get_seconds();
676}
677
fd39ca9a 678static void
1da177e4
LT		 679move_to_confirmed(struct nfs4_client *clp)
680{
681 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
682 unsigned int strhashval;
683
684 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
685 list_del_init(&clp->cl_strhash);
f116629d 686 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 687 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 688 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
689 renew_client(clp);
690}
691
692static struct nfs4_client *
693find_confirmed_client(clientid_t *clid)
694{
695 struct nfs4_client *clp;
696 unsigned int idhashval = clientid_hashval(clid->cl_id);
697
698 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 699 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 700 return clp;
701 }
702 return NULL;
703}
704
705static struct nfs4_client *
706find_unconfirmed_client(clientid_t *clid)
707{
708 struct nfs4_client *clp;
709 unsigned int idhashval = clientid_hashval(clid->cl_id);
710
711 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 712 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 713 return clp;
714 }
715 return NULL;
716}
717
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
b85d4c01
BH		 1003static int
1004check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
1005{
1006 dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
1007 slot->sl_seqid);
1008
1009 /* The slot is in use, and no response has been sent. */
1010 if (slot->sl_inuse) {
1011 if (seqid == slot->sl_seqid)
1012 return nfserr_jukebox;
1013 else
1014 return nfserr_seq_misordered;
1015 }
1016 /* Normal */
1017 if (likely(seqid == slot->sl_seqid + 1))
1018 return nfs_ok;
1019 /* Replay */
1020 if (seqid == slot->sl_seqid)
1021 return nfserr_replay_cache;
1022 /* Wraparound */
1023 if (seqid == 1 && (slot->sl_seqid + 1) == 0)
1024 return nfs_ok;
1025 /* Misordered replay or misordered new request */
1026 return nfserr_seq_misordered;
1027}
1028
069b6ad4
AA		 1029__be32
1030nfsd4_create_session(struct svc_rqst *rqstp,
1031 struct nfsd4_compound_state *cstate,
1032 struct nfsd4_create_session *cr_ses)
1033{
1034 return -1; /* stub */
1035}
1036
1037__be32
1038nfsd4_destroy_session(struct svc_rqst *r,
1039 struct nfsd4_compound_state *cstate,
1040 struct nfsd4_destroy_session *sessionid)
1041{
1042 return -1; /* stub */
1043}
1044
1045__be32
b85d4c01 1046nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1047 struct nfsd4_compound_state *cstate,
1048 struct nfsd4_sequence *seq)
1049{
b85d4c01
BH		 1050 struct nfsd4_session *session;
1051 struct nfsd4_slot *slot;
1052 int status;
1053
1054 spin_lock(&sessionid_lock);
1055 status = nfserr_badsession;
1056 session = find_in_sessionid_hashtbl(&seq->sessionid);
1057 if (!session)
1058 goto out;
1059
1060 status = nfserr_badslot;
1061 if (seq->slotid >= session->se_fnumslots)
1062 goto out;
1063
1064 slot = &session->se_slots[seq->slotid];
1065 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1066
1067 status = check_slot_seqid(seq->seqid, slot);
1068 if (status == nfserr_replay_cache) {
1069 cstate->slot = slot;
1070 cstate->session = session;
1071 goto replay_cache;
1072 }
1073 if (status)
1074 goto out;
1075
1076 /* Success! bump slot seqid */
1077 slot->sl_inuse = true;
1078 slot->sl_seqid = seq->seqid;
1079
1080 cstate->slot = slot;
1081 cstate->session = session;
1082
1083replay_cache:
1084 /* Renew the clientid on success and on replay.
1085 * Hold a session reference until done processing the compound:
1086 * nfsd4_put_session called only if the cstate slot is set.
1087 */
1088 renew_client(session->se_client);
1089 nfsd4_get_session(session);
1090out:
1091 spin_unlock(&sessionid_lock);
1092 dprintk("%s: return %d\n", __func__, ntohl(status));
1093 return status;
069b6ad4
AA		 1094}
1095
b37ad28b 1096__be32
b591480b
BF		 1097nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1098 struct nfsd4_setclientid *setclid)
1da177e4 1099{
27459f09 1100 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1101 struct xdr_netobj clname = {
1102 .len = setclid->se_namelen,
1103 .data = setclid->se_name,
1104 };
1105 nfs4_verifier clverifier = setclid->se_verf;
1106 unsigned int strhashval;
28ce6054 1107 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1108 __be32 status;
68e76ad0 1109 char *princ;
a55370a3 1110 char dname[HEXDIR_LEN];
1da177e4 1111
1da177e4 1112 if (!check_name(clname))
73aea4ec 1113 return nfserr_inval;
1da177e4 1114
a55370a3
N		 1115 status = nfs4_make_rec_clidname(dname, &clname);
1116 if (status)
73aea4ec 1117 return status;
a55370a3 1118
1da177e4
LT		 1119 /*
1120 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1121 * We get here on a DRC miss.
1122 */
1123
a55370a3 1124 strhashval = clientstr_hashval(dname);
1da177e4 1125
1da177e4 1126 nfs4_lock_state();
a1bcecd2 1127 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1128 if (conf) {
a186e767 1129 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1130 status = nfserr_clid_inuse;
026722c2
BF		 1131 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1132 dprintk("NFSD: setclientid: string in use by client"
1133 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1134 goto out;
1135 }
1da177e4 1136 }
a186e767
BF		 1137 /*
1138 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1139 * has a description of SETCLIENTID request processing consisting
1140 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1141 */
a1bcecd2 1142 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1143 status = nfserr_resource;
1144 if (!conf) {
a186e767
BF		 1145 /*
1146 * RFC 3530 14.2.33 CASE 4:
1147 * placed first, because it is the normal case
1da177e4
LT		 1148 */
1149 if (unconf)
1150 expire_client(unconf);
a55370a3
N		 1151 new = create_client(clname, dname);
1152 if (new == NULL)
1da177e4 1153 goto out;
1da177e4 1154 gen_clid(new);
599e0a22 1155 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1156 /*
a186e767
BF		 1157 * RFC 3530 14.2.33 CASE 1:
1158 * probable callback update
1da177e4 1159 */
31f4a6c1
N		 1160 if (unconf) {
1161 /* Note this is removing unconfirmed {*x***},
1162 * which is stronger than RFC recommended {vxc**}.
1163 * This has the advantage that there is at most
1164 * one {*x***} in either list at any time.
1165 */
1166 expire_client(unconf);
1da177e4 1167 }
a55370a3
N		 1168 new = create_client(clname, dname);
1169 if (new == NULL)
1da177e4 1170 goto out;
1da177e4 1171 copy_clid(new, conf);
1da177e4
LT		 1172 } else if (!unconf) {
1173 /*
a186e767
BF		 1174 * RFC 3530 14.2.33 CASE 2:
1175 * probable client reboot; state will be removed if
1176 * confirmed.
1da177e4 1177 */
a55370a3
N		 1178 new = create_client(clname, dname);
1179 if (new == NULL)
1da177e4 1180 goto out;
1da177e4 1181 gen_clid(new);
49ba8781 1182 } else {
a186e767
BF		 1183 /*
1184 * RFC 3530 14.2.33 CASE 3:
1185 * probable client reboot; state will be removed if
1186 * confirmed.
1da177e4
LT		 1187 */
1188 expire_client(unconf);
a55370a3
N		 1189 new = create_client(clname, dname);
1190 if (new == NULL)
1da177e4 1191 goto out;
1da177e4 1192 gen_clid(new);
1da177e4 1193 }
c175b83c
BF		 1194 copy_verf(new, &clverifier);
1195 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1196 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1197 princ = svc_gss_principal(rqstp);
1198 if (princ) {
1199 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1200 if (new->cl_principal == NULL) {
1201 free_client(new);
1202 goto out;
1203 }
1204 }
c175b83c
BF		 1205 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1206 gen_confirm(new);
1207 gen_callback(new, setclid);
1208 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1209 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1210 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1211 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1212 status = nfs_ok;
1213out:
1214 nfs4_unlock_state();
1215 return status;
1216}
1217
1218
1219/*
a186e767
BF		 1220 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1221 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1222 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1223 */
b37ad28b 1224__be32
b591480b
BF		 1225nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1226 struct nfsd4_compound_state *cstate,
1227 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1228{
27459f09 1229 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1230 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1231 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1232 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1233 __be32 status;
1da177e4
LT		 1234
1235 if (STALE_CLIENTID(clid))
1236 return nfserr_stale_clientid;
1237 /*
1238 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1239 * We get here on a DRC miss.
1240 */
1241
1242 nfs4_lock_state();
21ab45a4
N		 1243
1244 conf = find_confirmed_client(clid);
1245 unconf = find_unconfirmed_client(clid);
1246
1247 status = nfserr_clid_inuse;
27459f09 1248 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1249 goto out;
27459f09 1250 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1251 goto out;
1252
a186e767
BF		 1253 /*
1254 * section 14.2.34 of RFC 3530 has a description of
1255 * SETCLIENTID_CONFIRM request processing consisting
1256 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1257 */
366e0c1d 1258 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1259 /*
1260 * RFC 3530 14.2.34 CASE 1:
1261 * callback update
1262 */
599e0a22 1263 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1264 status = nfserr_clid_inuse;
1265 else {
1a69c179
N		 1266 /* XXX: We just turn off callbacks until we can handle
1267 * change request correctly. */
cb36d634 1268 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1269 gen_confirm(conf);
46309029 1270 nfsd4_remove_clid_dir(unconf);
1a69c179 1271 expire_client(unconf);
1da177e4 1272 status = nfs_ok;
1a69c179 1273
1da177e4 1274 }
f3aba4e5 1275 } else if (conf && !unconf) {
a186e767
BF		 1276 /*
1277 * RFC 3530 14.2.34 CASE 2:
1278 * probable retransmitted request; play it safe and
1279 * do nothing.
7c79f737 1280 */
599e0a22 1281 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1282 status = nfserr_clid_inuse;
21ab45a4 1283 else
1da177e4 1284 status = nfs_ok;
7c79f737 1285 } else if (!conf && unconf
599e0a22 1286 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1287 /*
1288 * RFC 3530 14.2.34 CASE 3:
1289 * Normal case; new or rebooted client:
7c79f737 1290 */
599e0a22 1291 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1292 status = nfserr_clid_inuse;
1293 } else {
1a69c179
N		 1294 unsigned int hash =
1295 clientstr_hashval(unconf->cl_recdir);
1296 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1297 hash, false);
1a69c179 1298 if (conf) {
c7b9a459 1299 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1300 expire_client(conf);
1301 }
1da177e4 1302 move_to_confirmed(unconf);
21ab45a4 1303 conf = unconf;
46f8a64b 1304 nfsd4_probe_callback(conf);
1a69c179 1305 status = nfs_ok;
1da177e4 1306 }
599e0a22
BF		 1307 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1308 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1309 &confirm)))) {
a186e767
BF		 1310 /*
1311 * RFC 3530 14.2.34 CASE 4:
1312 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1313 */
1da177e4 1314 status = nfserr_stale_clientid;
7c79f737 1315 } else {
08e8987c
N		 1316 /* check that we have hit one of the cases...*/
1317 status = nfserr_clid_inuse;
1318 }
1da177e4 1319out:
1da177e4
LT		 1320 nfs4_unlock_state();
1321 return status;
1322}
1323
1da177e4
LT		 1324/* OPEN Share state helper functions */
1325static inline struct nfs4_file *
1326alloc_init_file(struct inode *ino)
1327{
1328 struct nfs4_file *fp;
1329 unsigned int hashval = file_hashval(ino);
1330
e60d4398
N		 1331 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1332 if (fp) {
8b671b80 1333 atomic_set(&fp->fi_ref, 1);
1da177e4 1334 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1335 INIT_LIST_HEAD(&fp->fi_stateids);
1336 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1337 spin_lock(&recall_lock);
1da177e4 1338 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1339 spin_unlock(&recall_lock);
1da177e4
LT		 1340 fp->fi_inode = igrab(ino);
1341 fp->fi_id = current_fileid++;
47f9940c 1342 fp->fi_had_conflict = false;
1da177e4
LT		 1343 return fp;
1344 }
1345 return NULL;
1346}
1347
e60d4398 1348static void
e18b890b 1349nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1350{
e60d4398
N		 1351 if (*slab == NULL)
1352 return;
1a1d92c1 1353 kmem_cache_destroy(*slab);
e60d4398 1354 *slab = NULL;
1da177e4
LT		 1355}
1356
e8ff2a84 1357void
1da177e4
LT		 1358nfsd4_free_slabs(void)
1359{
e60d4398
N		 1360 nfsd4_free_slab(&stateowner_slab);
1361 nfsd4_free_slab(&file_slab);
5ac049ac 1362 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1363 nfsd4_free_slab(&deleg_slab);
e60d4398 1364}
1da177e4 1365
e60d4398
N		 1366static int
1367nfsd4_init_slabs(void)
1368{
1369 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1370 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1371 if (stateowner_slab == NULL)
1372 goto out_nomem;
1373 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1374 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1375 if (file_slab == NULL)
1376 goto out_nomem;
5ac049ac 1377 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1378 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1379 if (stateid_slab == NULL)
1380 goto out_nomem;
5b2d21c1 1381 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1382 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1383 if (deleg_slab == NULL)
1384 goto out_nomem;
e60d4398
N		 1385 return 0;
1386out_nomem:
1387 nfsd4_free_slabs();
1388 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1389 return -ENOMEM;
1da177e4
LT		 1390}
1391
1392void
1393nfs4_free_stateowner(struct kref *kref)
1394{
1395 struct nfs4_stateowner *sop =
1396 container_of(kref, struct nfs4_stateowner, so_ref);
1397 kfree(sop->so_owner.data);
1398 kmem_cache_free(stateowner_slab, sop);
1399}
1400
1401static inline struct nfs4_stateowner *
1402alloc_stateowner(struct xdr_netobj *owner)
1403{
1404 struct nfs4_stateowner *sop;
1405
1406 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1407 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1408 memcpy(sop->so_owner.data, owner->data, owner->len);
1409 sop->so_owner.len = owner->len;
1410 kref_init(&sop->so_ref);
1411 return sop;
1412 }
1413 kmem_cache_free(stateowner_slab, sop);
1414 }
1415 return NULL;
1416}
1417
1418static struct nfs4_stateowner *
1419alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1420 struct nfs4_stateowner *sop;
1421 struct nfs4_replay *rp;
1422 unsigned int idhashval;
1423
1424 if (!(sop = alloc_stateowner(&open->op_owner)))
1425 return NULL;
1426 idhashval = ownerid_hashval(current_ownerid);
1427 INIT_LIST_HEAD(&sop->so_idhash);
1428 INIT_LIST_HEAD(&sop->so_strhash);
1429 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1430 INIT_LIST_HEAD(&sop->so_stateids);
1431 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1432 INIT_LIST_HEAD(&sop->so_close_lru);
1433 sop->so_time = 0;
1434 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1435 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1436 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1437 sop->so_is_open_owner = 1;
1438 sop->so_id = current_ownerid++;
1439 sop->so_client = clp;
1440 sop->so_seqid = open->op_seqid;
1441 sop->so_confirmed = 0;
1442 rp = &sop->so_replay;
de1ae286 1443 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1444 rp->rp_buflen = 0;
1445 rp->rp_buf = rp->rp_ibuf;
1446 return sop;
1447}
1448
1da177e4
LT		 1449static inline void
1450init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1451 struct nfs4_stateowner *sop = open->op_stateowner;
1452 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1453
1454 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1455 INIT_LIST_HEAD(&stp->st_perstateowner);
1456 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1457 INIT_LIST_HEAD(&stp->st_perfile);
1458 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1459 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1460 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1461 stp->st_stateowner = sop;
13cd2184 1462 get_nfs4_file(fp);
1da177e4
LT		 1463 stp->st_file = fp;
1464 stp->st_stateid.si_boot = boot_time;
1465 stp->st_stateid.si_stateownerid = sop->so_id;
1466 stp->st_stateid.si_fileid = fp->fi_id;
1467 stp->st_stateid.si_generation = 0;
1468 stp->st_access_bmap = 0;
1469 stp->st_deny_bmap = 0;
1470 __set_bit(open->op_share_access, &stp->st_access_bmap);
1471 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1472 stp->st_openstp = NULL;
1da177e4
LT		 1473}
1474
fd39ca9a 1475static void
1da177e4
LT		 1476move_to_close_lru(struct nfs4_stateowner *sop)
1477{
1478 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1479
358dd55a 1480 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1481 sop->so_time = get_seconds();
1482}
1483
1da177e4 1484static int
599e0a22
BF		 1485same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1486 clientid_t *clid)
1487{
1488 return (sop->so_owner.len == owner->len) &&
1489 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1490 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1491}
1492
1493static struct nfs4_stateowner *
1494find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1495{
1496 struct nfs4_stateowner *so = NULL;
1497
1498 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1499 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1500 return so;
1501 }
1502 return NULL;
1503}
1504
1505/* search file_hashtbl[] for file */
1506static struct nfs4_file *
1507find_file(struct inode *ino)
1508{
1509 unsigned int hashval = file_hashval(ino);
1510 struct nfs4_file *fp;
1511
8b671b80 1512 spin_lock(&recall_lock);
1da177e4 1513 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1514 if (fp->fi_inode == ino) {
1515 get_nfs4_file(fp);
8b671b80 1516 spin_unlock(&recall_lock);
1da177e4 1517 return fp;
13cd2184 1518 }
1da177e4 1519 }
8b671b80 1520 spin_unlock(&recall_lock);
1da177e4
LT		 1521 return NULL;
1522}
1523
8838dc43 1524static inline int access_valid(u32 x)
ba5a6a19 1525{
8838dc43
BF		 1526 if (x < NFS4_SHARE_ACCESS_READ)
1527 return 0;
1528 if (x > NFS4_SHARE_ACCESS_BOTH)
1529 return 0;
1530 return 1;
ba5a6a19
BF		 1531}
1532
8838dc43 1533static inline int deny_valid(u32 x)
ba5a6a19 1534{
8838dc43
BF		 1535 /* Note: unlike access bits, deny bits may be zero. */
1536 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1537}
1da177e4 1538
4f83aa30
BF		 1539/*
1540 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1541 * st_{access,deny}_bmap field of the stateid, in order to track not
1542 * only what share bits are currently in force, but also what
1543 * combinations of share bits previous opens have used. This allows us
1544 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1545 * return an error if the client attempt to downgrade to a combination
1546 * of share bits not explicable by closing some of its previous opens.
1547 *
1548 * XXX: This enforcement is actually incomplete, since we don't keep
1549 * track of access/deny bit combinations; so, e.g., we allow:
1550 *
1551 * OPEN allow read, deny write
1552 * OPEN allow both, deny none
1553 * DOWNGRADE allow read, deny none
1554 *
1555 * which we should reject.
1556 */
fd39ca9a 1557static void
1da177e4
LT		 1558set_access(unsigned int *access, unsigned long bmap) {
1559 int i;
1560
1561 *access = 0;
1562 for (i = 1; i < 4; i++) {
1563 if (test_bit(i, &bmap))
1564 *access |= i;
1565 }
1566}
1567
fd39ca9a 1568static void
1da177e4
LT		 1569set_deny(unsigned int *deny, unsigned long bmap) {
1570 int i;
1571
1572 *deny = 0;
1573 for (i = 0; i < 4; i++) {
1574 if (test_bit(i, &bmap))
1575 *deny |= i ;
1576 }
1577}
1578
1579static int
1580test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1581 unsigned int access, deny;
1582
1583 set_access(&access, stp->st_access_bmap);
1584 set_deny(&deny, stp->st_deny_bmap);
1585 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1586 return 0;
1587 return 1;
1588}
1589
1590/*
1591 * Called to check deny when READ with all zero stateid or
1592 * WRITE with all zero or all one stateid
1593 */
b37ad28b 1594static __be32
1da177e4
LT		 1595nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1596{
1597 struct inode *ino = current_fh->fh_dentry->d_inode;
1598 struct nfs4_file *fp;
1599 struct nfs4_stateid *stp;
b37ad28b 1600 __be32 ret;
1da177e4
LT		 1601
1602 dprintk("NFSD: nfs4_share_conflict\n");
1603
1604 fp = find_file(ino);
13cd2184
N		 1605 if (!fp)
1606 return nfs_ok;
b700949b 1607 ret = nfserr_locked;
1da177e4 1608 /* Search for conflicting share reservations */
13cd2184
N		 1609 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1610 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1611 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1612 goto out;
1da177e4 1613 }
13cd2184
N		 1614 ret = nfs_ok;
1615out:
1616 put_nfs4_file(fp);
1617 return ret;
1da177e4
LT		 1618}
1619
1620static inline void
1621nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1622{
1623 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1624 drop_file_write_access(filp);
1da177e4
LT		 1625 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1626 }
1627}
1628
1629/*
1630 * Recall a delegation
1631 */
1632static int
1633do_recall(void *__dp)
1634{
1635 struct nfs4_delegation *dp = __dp;
1636
47f9940c 1637 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1638 nfsd4_cb_recall(dp);
1639 return 0;
1640}
1641
1642/*
1643 * Spawn a thread to perform a recall on the delegation represented
1644 * by the lease (file_lock)
1645 *
1646 * Called from break_lease() with lock_kernel() held.
1647 * Note: we assume break_lease will only call this *once* for any given
1648 * lease.
1649 */
1650static
1651void nfsd_break_deleg_cb(struct file_lock *fl)
1652{
1653 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1654 struct task_struct *t;
1655
1656 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1657 if (!dp)
1658 return;
1659
1660 /* We're assuming the state code never drops its reference
1661 * without first removing the lease. Since we're in this lease
1662 * callback (and since the lease code is serialized by the kernel
1663 * lock) we know the server hasn't removed the lease yet, we know
1664 * it's safe to take a reference: */
1665 atomic_inc(&dp->dl_count);
cfdcad4d 1666 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1667
1668 spin_lock(&recall_lock);
1669 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1670 spin_unlock(&recall_lock);
1671
1672 /* only place dl_time is set. protected by lock_kernel*/
1673 dp->dl_time = get_seconds();
1674
0272e1fd
BF		 1675 /*
1676 * We don't want the locks code to timeout the lease for us;
1677 * we'll remove it ourself if the delegation isn't returned
1678 * in time.
1679 */
1680 fl->fl_break_time = 0;
1da177e4
LT		 1681
1682 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1683 if (IS_ERR(t)) {
1684 struct nfs4_client *clp = dp->dl_client;
1685
1686 printk(KERN_INFO "NFSD: Callback thread failed for "
1687 "for client (clientid %08x/%08x)\n",
1688 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1689 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1690 nfs4_put_delegation(dp);
1691 }
1692}
1693
1694/*
1695 * The file_lock is being reapd.
1696 *
1697 * Called by locks_free_lock() with lock_kernel() held.
1698 */
1699static
1700void nfsd_release_deleg_cb(struct file_lock *fl)
1701{
1702 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1703
1704 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1705
1706 if (!(fl->fl_flags & FL_LEASE) || !dp)
1707 return;
1708 dp->dl_flock = NULL;
1709}
1710
1711/*
1712 * Set the delegation file_lock back pointer.
1713 *
a9933cea 1714 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1715 */
1716static
1717void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1718{
1719 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1720
1721 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1722 if (!dp)
1723 return;
1724 dp->dl_flock = new;
1725}
1726
1727/*
a9933cea 1728 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1729 */
1730static
1731int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1732{
1733 struct nfs4_delegation *onlistd =
1734 (struct nfs4_delegation *)onlist->fl_owner;
1735 struct nfs4_delegation *tryd =
1736 (struct nfs4_delegation *)try->fl_owner;
1737
1738 if (onlist->fl_lmops != try->fl_lmops)
1739 return 0;
1740
1741 return onlistd->dl_client == tryd->dl_client;
1742}
1743
1744
1745static
1746int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1747{
1748 if (arg & F_UNLCK)
1749 return lease_modify(onlist, arg);
1750 else
1751 return -EAGAIN;
1752}
1753
fd39ca9a 1754static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1755 .fl_break = nfsd_break_deleg_cb,
1756 .fl_release_private = nfsd_release_deleg_cb,
1757 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1758 .fl_mylease = nfsd_same_client_deleg_cb,
1759 .fl_change = nfsd_change_deleg_cb,
1760};
1761
1762
b37ad28b 1763__be32
1da177e4
LT		 1764nfsd4_process_open1(struct nfsd4_open *open)
1765{
1da177e4
LT		 1766 clientid_t *clientid = &open->op_clientid;
1767 struct nfs4_client *clp = NULL;
1768 unsigned int strhashval;
1769 struct nfs4_stateowner *sop = NULL;
1770
1da177e4 1771 if (!check_name(open->op_owner))
0f442aa2 1772 return nfserr_inval;
1da177e4
LT		 1773
1774 if (STALE_CLIENTID(&open->op_clientid))
1775 return nfserr_stale_clientid;
1776
1777 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1778 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1779 open->op_stateowner = sop;
1780 if (!sop) {
1781 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1782 clp = find_confirmed_client(clientid);
1783 if (clp == NULL)
0f442aa2
BF		 1784 return nfserr_expired;
1785 goto renew;
1da177e4 1786 }
0f442aa2
BF		 1787 if (!sop->so_confirmed) {
1788 /* Replace unconfirmed owners without checking for replay. */
1789 clp = sop->so_client;
f044ff83 1790 release_openowner(sop);
0f442aa2
BF		 1791 open->op_stateowner = NULL;
1792 goto renew;
1793 }
1794 if (open->op_seqid == sop->so_seqid - 1) {
1795 if (sop->so_replay.rp_buflen)
a90b061c 1796 return nfserr_replay_me;
0f442aa2
BF		 1797 /* The original OPEN failed so spectacularly
1798 * that we don't even have replay data saved!
1799 * Therefore, we have no choice but to continue
1800 * processing this OPEN; presumably, we'll
1801 * fail again for the same reason.
1802 */
1803 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1804 goto renew;
1805 }
1806 if (open->op_seqid != sop->so_seqid)
1807 return nfserr_bad_seqid;
1da177e4 1808renew:
0f442aa2
BF		 1809 if (open->op_stateowner == NULL) {
1810 sop = alloc_init_open_stateowner(strhashval, clp, open);
1811 if (sop == NULL)
1812 return nfserr_resource;
1813 open->op_stateowner = sop;
1814 }
1815 list_del_init(&sop->so_close_lru);
1da177e4 1816 renew_client(sop->so_client);
0f442aa2 1817 return nfs_ok;
1da177e4
LT		 1818}
1819
b37ad28b 1820static inline __be32
4a6e43e6
N		 1821nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1822{
1823 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1824 return nfserr_openmode;
1825 else
1826 return nfs_ok;
1827}
1828
52f4fb43
N		 1829static struct nfs4_delegation *
1830find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1831{
1832 struct nfs4_delegation *dp;
1833
ea1da636 1834 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1835 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1836 return dp;
1837 }
1838 return NULL;
1839}
1840
b37ad28b 1841static __be32
567d9829
N		 1842nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1843 struct nfs4_delegation **dp)
1844{
1845 int flags;
b37ad28b 1846 __be32 status = nfserr_bad_stateid;
567d9829
N		 1847
1848 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1849 if (*dp == NULL)
c44c5eeb 1850 goto out;
567d9829
N		 1851 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1852 RD_STATE : WR_STATE;
1853 status = nfs4_check_delegmode(*dp, flags);
1854 if (status)
1855 *dp = NULL;
c44c5eeb
N		 1856out:
1857 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1858 return nfs_ok;
1859 if (status)
1860 return status;
1861 open->op_stateowner->so_confirmed = 1;
1862 return nfs_ok;
567d9829
N		 1863}
1864
b37ad28b 1865static __be32
1da177e4
LT		 1866nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1867{
1868 struct nfs4_stateid *local;
b37ad28b 1869 __be32 status = nfserr_share_denied;
1da177e4
LT		 1870 struct nfs4_stateowner *sop = open->op_stateowner;
1871
8beefa24 1872 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1873 /* ignore lock owners */
1874 if (local->st_stateowner->so_is_open_owner == 0)
1875 continue;
1876 /* remember if we have seen this open owner */
1877 if (local->st_stateowner == sop)
1878 *stpp = local;
1879 /* check for conflicting share reservations */
1880 if (!test_share(local, open))
1881 goto out;
1882 }
1883 status = 0;
1884out:
1885 return status;
1886}
1887
5ac049ac
N		 1888static inline struct nfs4_stateid *
1889nfs4_alloc_stateid(void)
1890{
1891 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1892}
1893
b37ad28b 1894static __be32
1da177e4 1895nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1896 struct nfs4_delegation *dp,
1da177e4
LT		 1897 struct svc_fh *cur_fh, int flags)
1898{
1899 struct nfs4_stateid *stp;
1da177e4 1900
5ac049ac 1901 stp = nfs4_alloc_stateid();
1da177e4
LT		 1902 if (stp == NULL)
1903 return nfserr_resource;
1904
567d9829
N		 1905 if (dp) {
1906 get_file(dp->dl_vfs_file);
1907 stp->st_vfs_file = dp->dl_vfs_file;
1908 } else {
b37ad28b 1909 __be32 status;
567d9829
N		 1910 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1911 &stp->st_vfs_file);
1912 if (status) {
1913 if (status == nfserr_dropit)
1914 status = nfserr_jukebox;
5ac049ac 1915 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1916 return status;
1917 }
1da177e4 1918 }
1da177e4
LT		 1919 *stpp = stp;
1920 return 0;
1921}
1922
b37ad28b 1923static inline __be32
1da177e4
LT		 1924nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1925 struct nfsd4_open *open)
1926{
1927 struct iattr iattr = {
1928 .ia_valid = ATTR_SIZE,
1929 .ia_size = 0,
1930 };
1931 if (!open->op_truncate)
1932 return 0;
1933 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1934 return nfserr_inval;
1da177e4
LT		 1935 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1936}
1937
b37ad28b 1938static __be32
1da177e4
LT		 1939nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1940{
1941 struct file *filp = stp->st_vfs_file;
7eaa36e2 1942 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1943 unsigned int share_access, new_writer;
b37ad28b 1944 __be32 status;
1da177e4
LT		 1945
1946 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1947 new_writer = (~share_access) & open->op_share_access
1948 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1949
6c26d08f 1950 if (new_writer) {
b37ad28b
AV		 1951 int err = get_write_access(inode);
1952 if (err)
1953 return nfserrno(err);
e518f056
BH		 1954 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1955 if (err)
1956 return nfserrno(err);
1957 file_take_write(filp);
6c26d08f 1958 }
1da177e4
LT		 1959 status = nfsd4_truncate(rqstp, cur_fh, open);
1960 if (status) {
6c26d08f
BF		 1961 if (new_writer)
1962 put_write_access(inode);
1da177e4
LT		 1963 return status;
1964 }
1965 /* remember the open */
6c26d08f 1966 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1967 __set_bit(open->op_share_access, &stp->st_access_bmap);
1968 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1969
1970 return nfs_ok;
1971}
1972
1973
1da177e4 1974static void
37515177 1975nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1976{
37515177
N		 1977 open->op_stateowner->so_confirmed = 1;
1978 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1979}
1980
1981/*
1982 * Attempt to hand out a delegation.
1983 */
1984static void
1985nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1986{
1987 struct nfs4_delegation *dp;
1988 struct nfs4_stateowner *sop = stp->st_stateowner;
1989 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1990 struct file_lock fl, *flp = &fl;
1991 int status, flag = 0;
1992
1993 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1994 open->op_recall = 0;
1995 switch (open->op_claim_type) {
1996 case NFS4_OPEN_CLAIM_PREVIOUS:
1997 if (!atomic_read(&cb->cb_set))
1998 open->op_recall = 1;
1999 flag = open->op_delegate_type;
2000 if (flag == NFS4_OPEN_DELEGATE_NONE)
2001 goto out;
2002 break;
2003 case NFS4_OPEN_CLAIM_NULL:
2004 /* Let's not give out any delegations till everyone's
2005 * had the chance to reclaim theirs.... */
af558e33 2006 if (locks_in_grace())
7b190fec
N		 2007 goto out;
2008 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2009 goto out;
2010 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2011 flag = NFS4_OPEN_DELEGATE_WRITE;
2012 else
2013 flag = NFS4_OPEN_DELEGATE_READ;
2014 break;
2015 default:
2016 goto out;
2017 }
1da177e4
LT		 2018
2019 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2020 if (dp == NULL) {
2021 flag = NFS4_OPEN_DELEGATE_NONE;
2022 goto out;
2023 }
2024 locks_init_lock(&fl);
2025 fl.fl_lmops = &nfsd_lease_mng_ops;
2026 fl.fl_flags = FL_LEASE;
9167f501 2027 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2028 fl.fl_end = OFFSET_MAX;
2029 fl.fl_owner = (fl_owner_t)dp;
2030 fl.fl_file = stp->st_vfs_file;
2031 fl.fl_pid = current->tgid;
2032
a9933cea 2033 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2034 * the lock_manager callbacks fl_mylease and fl_change are used
2035 */
9167f501 2036 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2037 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2038 unhash_delegation(dp);
1da177e4
LT		 2039 flag = NFS4_OPEN_DELEGATE_NONE;
2040 goto out;
2041 }
2042
2043 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2044
2045 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2046 dp->dl_stateid.si_boot,
2047 dp->dl_stateid.si_stateownerid,
2048 dp->dl_stateid.si_fileid,
2049 dp->dl_stateid.si_generation);
2050out:
7b190fec
N		 2051 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2052 && flag == NFS4_OPEN_DELEGATE_NONE
2053 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2054 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2055 open->op_delegate_type = flag;
2056}
2057
2058/*
2059 * called with nfs4_lock_state() held.
2060 */
b37ad28b 2061__be32
1da177e4
LT		 2062nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2063{
2064 struct nfs4_file *fp = NULL;
2065 struct inode *ino = current_fh->fh_dentry->d_inode;
2066 struct nfs4_stateid *stp = NULL;
567d9829 2067 struct nfs4_delegation *dp = NULL;
b37ad28b 2068 __be32 status;
1da177e4
LT		 2069
2070 status = nfserr_inval;
ba5a6a19
BF		 2071 if (!access_valid(open->op_share_access)
2072 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2073 goto out;
2074 /*
2075 * Lookup file; if found, lookup stateid and check open request,
2076 * and check for delegations in the process of being recalled.
2077 * If not found, create the nfs4_file struct
2078 */
2079 fp = find_file(ino);
2080 if (fp) {
2081 if ((status = nfs4_check_open(fp, open, &stp)))
2082 goto out;
c44c5eeb
N		 2083 status = nfs4_check_deleg(fp, open, &dp);
2084 if (status)
2085 goto out;
1da177e4 2086 } else {
c44c5eeb
N		 2087 status = nfserr_bad_stateid;
2088 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2089 goto out;
1da177e4
LT		 2090 status = nfserr_resource;
2091 fp = alloc_init_file(ino);
2092 if (fp == NULL)
2093 goto out;
2094 }
2095
2096 /*
2097 * OPEN the file, or upgrade an existing OPEN.
2098 * If truncate fails, the OPEN fails.
2099 */
2100 if (stp) {
2101 /* Stateid was found, this is an OPEN upgrade */
2102 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2103 if (status)
2104 goto out;
444c2c07 2105 update_stateid(&stp->st_stateid);
1da177e4
LT		 2106 } else {
2107 /* Stateid was not found, this is a new OPEN */
2108 int flags = 0;
9ecb6a08 2109 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2110 flags |= NFSD_MAY_READ;
1da177e4 2111 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2112 flags |= NFSD_MAY_WRITE;
567d9829
N		 2113 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2114 if (status)
1da177e4
LT		 2115 goto out;
2116 init_stateid(stp, fp, open);
2117 status = nfsd4_truncate(rqstp, current_fh, open);
2118 if (status) {
2283963f 2119 release_open_stateid(stp);
1da177e4
LT		 2120 goto out;
2121 }
2122 }
2123 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2124
2125 /*
2126 * Attempt to hand out a delegation. No error return, because the
2127 * OPEN succeeds even if we fail.
2128 */
2129 nfs4_open_delegation(current_fh, open, stp);
2130
2131 status = nfs_ok;
2132
2133 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2134 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2135 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2136out:
13cd2184
N		 2137 if (fp)
2138 put_nfs4_file(fp);
37515177
N		 2139 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2140 nfs4_set_claim_prev(open);
1da177e4
LT		 2141 /*
2142 * To finish the open response, we just need to set the rflags.
2143 */
2144 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2145 if (!open->op_stateowner->so_confirmed)
2146 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2147
2148 return status;
2149}
2150
b37ad28b 2151__be32
b591480b
BF		 2152nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2153 clientid_t *clid)
1da177e4
LT		 2154{
2155 struct nfs4_client *clp;
b37ad28b 2156 __be32 status;
1da177e4
LT		 2157
2158 nfs4_lock_state();
2159 dprintk("process_renew(%08x/%08x): starting\n",
2160 clid->cl_boot, clid->cl_id);
2161 status = nfserr_stale_clientid;
2162 if (STALE_CLIENTID(clid))
2163 goto out;
2164 clp = find_confirmed_client(clid);
2165 status = nfserr_expired;
2166 if (clp == NULL) {
2167 /* We assume the client took too long to RENEW. */
2168 dprintk("nfsd4_renew: clientid not found!\n");
2169 goto out;
2170 }
2171 renew_client(clp);
2172 status = nfserr_cb_path_down;
ea1da636 2173 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 2174 && !atomic_read(&clp->cl_callback.cb_set))
2175 goto out;
2176 status = nfs_ok;
2177out:
2178 nfs4_unlock_state();
2179 return status;
2180}
2181
af558e33
BF		 2182struct lock_manager nfsd4_manager = {
2183};
2184
a76b4319 2185static void
af558e33 2186nfsd4_end_grace(void)
a76b4319
N		 2187{
2188 dprintk("NFSD: end of grace period\n");
c7b9a459 2189 nfsd4_recdir_purge_old();
af558e33 2190 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2191}
2192
fd39ca9a 2193static time_t
1da177e4
LT		 2194nfs4_laundromat(void)
2195{
2196 struct nfs4_client *clp;
2197 struct nfs4_stateowner *sop;
2198 struct nfs4_delegation *dp;
2199 struct list_head *pos, *next, reaplist;
2200 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2201 time_t t, clientid_val = NFSD_LEASE_TIME;
2202 time_t u, test_val = NFSD_LEASE_TIME;
2203
2204 nfs4_lock_state();
2205
2206 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2207 if (locks_in_grace())
2208 nfsd4_end_grace();
1da177e4
LT		 2209 list_for_each_safe(pos, next, &client_lru) {
2210 clp = list_entry(pos, struct nfs4_client, cl_lru);
2211 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2212 t = clp->cl_time - cutoff;
2213 if (clientid_val > t)
2214 clientid_val = t;
2215 break;
2216 }
2217 dprintk("NFSD: purging unused client (clientid %08x)\n",
2218 clp->cl_clientid.cl_id);
c7b9a459 2219 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2220 expire_client(clp);
2221 }
2222 INIT_LIST_HEAD(&reaplist);
2223 spin_lock(&recall_lock);
2224 list_for_each_safe(pos, next, &del_recall_lru) {
2225 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2226 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2227 u = dp->dl_time - cutoff;
2228 if (test_val > u)
2229 test_val = u;
2230 break;
2231 }
2232 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2233 dp, dp->dl_flock);
2234 list_move(&dp->dl_recall_lru, &reaplist);
2235 }
2236 spin_unlock(&recall_lock);
2237 list_for_each_safe(pos, next, &reaplist) {
2238 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2239 list_del_init(&dp->dl_recall_lru);
2240 unhash_delegation(dp);
2241 }
2242 test_val = NFSD_LEASE_TIME;
2243 list_for_each_safe(pos, next, &close_lru) {
2244 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2245 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2246 u = sop->so_time - cutoff;
2247 if (test_val > u)
2248 test_val = u;
2249 break;
2250 }
2251 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2252 sop->so_id);
f044ff83 2253 release_openowner(sop);
1da177e4
LT		 2254 }
2255 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2256 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2257 nfs4_unlock_state();
2258 return clientid_val;
2259}
2260
a254b246
HH		 2261static struct workqueue_struct *laundry_wq;
2262static void laundromat_main(struct work_struct *);
2263static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2264
2265static void
c4028958 2266laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2267{
2268 time_t t;
2269
2270 t = nfs4_laundromat();
2271 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2272 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2273}
2274
fd39ca9a 2275static struct nfs4_stateowner *
f8816512
N		 2276search_close_lru(u32 st_id, int flags)
2277{
1da177e4
LT		 2278 struct nfs4_stateowner *local = NULL;
2279
1da177e4
LT		 2280 if (flags & CLOSE_STATE) {
2281 list_for_each_entry(local, &close_lru, so_close_lru) {
2282 if (local->so_id == st_id)
2283 return local;
2284 }
2285 }
2286 return NULL;
2287}
2288
2289static inline int
2290nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2291{
7eaa36e2 2292 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2293}
2294
2295static int
2296STALE_STATEID(stateid_t *stateid)
2297{
2298 if (stateid->si_boot == boot_time)
2299 return 0;
849823c5 2300 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2301 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2302 stateid->si_generation);
2303 return 1;
2304}
2305
2306static inline int
2307access_permit_read(unsigned long access_bmap)
2308{
2309 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2310 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2311 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2312}
2313
2314static inline int
2315access_permit_write(unsigned long access_bmap)
2316{
2317 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2318 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2319}
2320
2321static
b37ad28b 2322__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2323{
b37ad28b 2324 __be32 status = nfserr_openmode;
1da177e4
LT		 2325
2326 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2327 goto out;
2328 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2329 goto out;
2330 status = nfs_ok;
2331out:
2332 return status;
2333}
2334
b37ad28b 2335static inline __be32
1da177e4
LT		 2336check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2337{
203a8c8e 2338 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2339 return nfs_ok;
af558e33 2340 else if (locks_in_grace()) {
1da177e4
LT		 2341 /* Answer in remaining cases depends on existance of
2342 * conflicting state; so we must wait out the grace period. */
2343 return nfserr_grace;
2344 } else if (flags & WR_STATE)
2345 return nfs4_share_conflict(current_fh,
2346 NFS4_SHARE_DENY_WRITE);
2347 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2348 return nfs4_share_conflict(current_fh,
2349 NFS4_SHARE_DENY_READ);
2350}
2351
2352/*
2353 * Allow READ/WRITE during grace period on recovered state only for files
2354 * that are not able to provide mandatory locking.
2355 */
2356static inline int
18f82731 2357grace_disallows_io(struct inode *inode)
1da177e4 2358{
203a8c8e 2359 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2360}
2361
0836f587
BF		 2362static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2363{
2364 /* If the client sends us a stateid from the future, it's buggy: */
2365 if (in->si_generation > ref->si_generation)
2366 return nfserr_bad_stateid;
2367 /*
2368 * The following, however, can happen. For example, if the
2369 * client sends an open and some IO at the same time, the open
2370 * may bump si_generation while the IO is still in flight.
2371 * Thanks to hard links and renames, the client never knows what
2372 * file an open will affect. So it could avoid that situation
2373 * only by serializing all opens and IO from the same open
2374 * owner. To recover from the old_stateid error, the client
2375 * will just have to retry the IO:
2376 */
2377 if (in->si_generation < ref->si_generation)
2378 return nfserr_old_stateid;
2379 return nfs_ok;
2380}
2381
3e633079
BF		 2382static int is_delegation_stateid(stateid_t *stateid)
2383{
2384 return stateid->si_fileid == 0;
2385}
2386
1da177e4
LT		 2387/*
2388* Checks for stateid operations
2389*/
b37ad28b 2390__be32
1da177e4
LT		 2391nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2392{
2393 struct nfs4_stateid *stp = NULL;
2394 struct nfs4_delegation *dp = NULL;
1da177e4 2395 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2396 __be32 status;
1da177e4 2397
1da177e4
LT		 2398 if (filpp)
2399 *filpp = NULL;
2400
18f82731 2401 if (grace_disallows_io(ino))
1da177e4
LT		 2402 return nfserr_grace;
2403
2404 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2405 return check_special_stateids(current_fh, stateid, flags);
2406
1da177e4
LT		 2407 status = nfserr_stale_stateid;
2408 if (STALE_STATEID(stateid))
2409 goto out;
2410
1da177e4 2411 status = nfserr_bad_stateid;
3e633079 2412 if (is_delegation_stateid(stateid)) {
a4455be0 2413 dp = find_delegation_stateid(ino, stateid);
819a8f53 2414 if (!dp)
1da177e4 2415 goto out;
fd03b099 2416 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2417 if (status)
2418 goto out;
dc9bf700
BF		 2419 status = nfs4_check_delegmode(dp, flags);
2420 if (status)
2421 goto out;
2422 renew_client(dp->dl_client);
dc9bf700
BF		 2423 if (filpp)
2424 *filpp = dp->dl_vfs_file;
1da177e4 2425 } else { /* open or lock stateid */
a4455be0 2426 stp = find_stateid(stateid, flags);
819a8f53 2427 if (!stp)
1da177e4 2428 goto out;
6150ef0d 2429 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2430 goto out;
2431 if (!stp->st_stateowner->so_confirmed)
2432 goto out;
fd03b099 2433 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2434 if (status)
2435 goto out;
a4455be0
BF		 2436 status = nfs4_check_openmode(stp, flags);
2437 if (status)
1da177e4
LT		 2438 goto out;
2439 renew_client(stp->st_stateowner->so_client);
2440 if (filpp)
2441 *filpp = stp->st_vfs_file;
1da177e4
LT		 2442 }
2443 status = nfs_ok;
2444out:
2445 return status;
2446}
2447
4c4cd222
N		 2448static inline int
2449setlkflg (int type)
2450{
2451 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2452 RD_STATE : WR_STATE;
2453}
1da177e4
LT		 2454
2455/*
2456 * Checks for sequence id mutating operations.
2457 */
b37ad28b 2458static __be32
4c4cd222 2459nfs4_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 2460{
1da177e4
LT		 2461 struct nfs4_stateid *stp;
2462 struct nfs4_stateowner *sop;
0836f587 2463 __be32 status;
1da177e4
LT		 2464
2465 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2466 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2467 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2468 stateid->si_generation);
3a4f98bb 2469
1da177e4
LT		 2470 *stpp = NULL;
2471 *sopp = NULL;
2472
1da177e4 2473 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2474 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2475 return nfserr_bad_stateid;
1da177e4
LT		 2476 }
2477
1da177e4 2478 if (STALE_STATEID(stateid))
3a4f98bb 2479 return nfserr_stale_stateid;
1da177e4
LT		 2480 /*
2481 * We return BAD_STATEID if filehandle doesn't match stateid,
2482 * the confirmed flag is incorrecly set, or the generation
2483 * number is incorrect.
1da177e4 2484 */
f8816512
N		 2485 stp = find_stateid(stateid, flags);
2486 if (stp == NULL) {
2487 /*
2488 * Also, we should make sure this isn't just the result of
2489 * a replayed close:
2490 */
2491 sop = search_close_lru(stateid->si_stateownerid, flags);
2492 if (sop == NULL)
2493 return nfserr_bad_stateid;
2494 *sopp = sop;
2495 goto check_replay;
2496 }
1da177e4 2497
39325bd0
BF		 2498 *stpp = stp;
2499 *sopp = sop = stp->st_stateowner;
2500
4c4cd222 2501 if (lock) {
4c4cd222 2502 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2503 struct nfs4_client *clp = sop->so_client;
4c4cd222 2504 int lkflg = 0;
b37ad28b 2505 __be32 status;
4c4cd222
N		 2506
2507 lkflg = setlkflg(lock->lk_type);
2508
2509 if (lock->lk_is_new) {
599e0a22
BF		 2510 if (!sop->so_is_open_owner)
2511 return nfserr_bad_stateid;
2512 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2513 return nfserr_bad_stateid;
599e0a22
BF		 2514 /* stp is the open stateid */
2515 status = nfs4_check_openmode(stp, lkflg);
2516 if (status)
2517 return status;
2518 } else {
2519 /* stp is the lock stateid */
2520 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2521 if (status)
2522 return status;
4c4cd222 2523 }
1da177e4
LT		 2524 }
2525
f3362737 2526 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2527 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2528 return nfserr_bad_stateid;
1da177e4
LT		 2529 }
2530
1da177e4
LT		 2531 /*
2532 * We now validate the seqid and stateid generation numbers.
2533 * For the moment, we ignore the possibility of
2534 * generation number wraparound.
2535 */
bd9aac52 2536 if (seqid != sop->so_seqid)
1da177e4
LT		 2537 goto check_replay;
2538
3a4f98bb 2539 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2540 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2541 " unconfirmed stateowner!\n");
2542 return nfserr_bad_stateid;
1da177e4 2543 }
3a4f98bb 2544 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2545 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2546 " confirmed yet!\n");
2547 return nfserr_bad_stateid;
1da177e4 2548 }
0836f587
BF		 2549 status = check_stateid_generation(stateid, &stp->st_stateid);
2550 if (status)
2551 return status;
52fd004e 2552 renew_client(sop->so_client);
3a4f98bb 2553 return nfs_ok;
1da177e4 2554
1da177e4 2555check_replay:
bd9aac52 2556 if (seqid == sop->so_seqid - 1) {
849823c5 2557 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2558 /* indicate replay to calling function */
a90b061c 2559 return nfserr_replay_me;
1da177e4 2560 }
2fdada03 2561 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2562 sop->so_seqid, seqid);
2563 *sopp = NULL;
2564 return nfserr_bad_seqid;
1da177e4
LT		 2565}
2566
b37ad28b 2567__be32
ca364317 2568nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2569 struct nfsd4_open_confirm *oc)
1da177e4 2570{
b37ad28b 2571 __be32 status;
1da177e4
LT		 2572 struct nfs4_stateowner *sop;
2573 struct nfs4_stateid *stp;
2574
2575 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2576 (int)cstate->current_fh.fh_dentry->d_name.len,
2577 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2578
ca364317 2579 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2580 if (status)
2581 return status;
1da177e4
LT		 2582
2583 nfs4_lock_state();
2584
ca364317
BF		 2585 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2586 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2587 CONFIRM | OPEN_STATE,
1da177e4
LT		 2588 &oc->oc_stateowner, &stp, NULL)))
2589 goto out;
2590
2591 sop = oc->oc_stateowner;
2592 sop->so_confirmed = 1;
2593 update_stateid(&stp->st_stateid);
2594 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2595 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2596 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2597 stp->st_stateid.si_boot,
2598 stp->st_stateid.si_stateownerid,
2599 stp->st_stateid.si_fileid,
2600 stp->st_stateid.si_generation);
c7b9a459
N		 2601
2602 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2603out:
f2327d9a 2604 if (oc->oc_stateowner) {
1da177e4 2605 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2606 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2607 }
1da177e4
LT		 2608 nfs4_unlock_state();
2609 return status;
2610}
2611
2612
2613/*
2614 * unset all bits in union bitmap (bmap) that
2615 * do not exist in share (from successful OPEN_DOWNGRADE)
2616 */
2617static void
2618reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2619{
2620 int i;
2621 for (i = 1; i < 4; i++) {
2622 if ((i & access) != i)
2623 __clear_bit(i, bmap);
2624 }
2625}
2626
2627static void
2628reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2629{
2630 int i;
2631 for (i = 0; i < 4; i++) {
2632 if ((i & deny) != i)
2633 __clear_bit(i, bmap);
2634 }
2635}
2636
b37ad28b 2637__be32
ca364317
BF		 2638nfsd4_open_downgrade(struct svc_rqst *rqstp,
2639 struct nfsd4_compound_state *cstate,
a4f1706a 2640 struct nfsd4_open_downgrade *od)
1da177e4 2641{
b37ad28b 2642 __be32 status;
1da177e4
LT		 2643 struct nfs4_stateid *stp;
2644 unsigned int share_access;
2645
2646 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2647 (int)cstate->current_fh.fh_dentry->d_name.len,
2648 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2649
ba5a6a19
BF		 2650 if (!access_valid(od->od_share_access)
2651 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2652 return nfserr_inval;
2653
2654 nfs4_lock_state();
ca364317
BF		 2655 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2656 od->od_seqid,
1da177e4 2657 &od->od_stateid,
f3362737 2658 OPEN_STATE,
1da177e4
LT		 2659 &od->od_stateowner, &stp, NULL)))
2660 goto out;
2661
2662 status = nfserr_inval;
2663 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2664 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2665 stp->st_access_bmap, od->od_share_access);
2666 goto out;
2667 }
2668 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2669 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2670 stp->st_deny_bmap, od->od_share_deny);
2671 goto out;
2672 }
2673 set_access(&share_access, stp->st_access_bmap);
2674 nfs4_file_downgrade(stp->st_vfs_file,
2675 share_access & ~od->od_share_access);
2676
2677 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2678 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2679
2680 update_stateid(&stp->st_stateid);
2681 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2682 status = nfs_ok;
2683out:
f2327d9a 2684 if (od->od_stateowner) {
1da177e4 2685 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2686 cstate->replay_owner = od->od_stateowner;
f2327d9a 2687 }
1da177e4
LT		 2688 nfs4_unlock_state();
2689 return status;
2690}
2691
2692/*
2693 * nfs4_unlock_state() called after encode
2694 */
b37ad28b 2695__be32
ca364317 2696nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2697 struct nfsd4_close *close)
1da177e4 2698{
b37ad28b 2699 __be32 status;
1da177e4
LT		 2700 struct nfs4_stateid *stp;
2701
2702 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2703 (int)cstate->current_fh.fh_dentry->d_name.len,
2704 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2705
2706 nfs4_lock_state();
2707 /* check close_lru for replay */
ca364317
BF		 2708 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2709 close->cl_seqid,
1da177e4 2710 &close->cl_stateid,
f3362737 2711 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2712 &close->cl_stateowner, &stp, NULL)))
2713 goto out;
1da177e4
LT		 2714 status = nfs_ok;
2715 update_stateid(&stp->st_stateid);
2716 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2717
04ef5954 2718 /* release_stateid() calls nfsd_close() if needed */
2283963f 2719 release_open_stateid(stp);
04ef5954
BF		 2720
2721 /* place unused nfs4_stateowners on so_close_lru list to be
2722 * released by the laundromat service after the lease period
2723 * to enable us to handle CLOSE replay
2724 */
2725 if (list_empty(&close->cl_stateowner->so_stateids))
2726 move_to_close_lru(close->cl_stateowner);
1da177e4 2727out:
f2327d9a 2728 if (close->cl_stateowner) {
1da177e4 2729 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2730 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2731 }
1da177e4
LT		 2732 nfs4_unlock_state();
2733 return status;
2734}
2735
b37ad28b 2736__be32
ca364317
BF		 2737nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2738 struct nfsd4_delegreturn *dr)
1da177e4 2739{
203a8c8e
BF		 2740 struct nfs4_delegation *dp;
2741 stateid_t *stateid = &dr->dr_stateid;
2742 struct inode *inode;
b37ad28b 2743 __be32 status;
1da177e4 2744
ca364317 2745 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2746 return status;
2747 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2748
2749 nfs4_lock_state();
203a8c8e
BF		 2750 status = nfserr_bad_stateid;
2751 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2752 goto out;
2753 status = nfserr_stale_stateid;
2754 if (STALE_STATEID(stateid))
2755 goto out;
7e0f7cf5 2756 status = nfserr_bad_stateid;
203a8c8e
BF		 2757 if (!is_delegation_stateid(stateid))
2758 goto out;
203a8c8e
BF		 2759 dp = find_delegation_stateid(inode, stateid);
2760 if (!dp)
2761 goto out;
2762 status = check_stateid_generation(stateid, &dp->dl_stateid);
2763 if (status)
2764 goto out;
2765 renew_client(dp->dl_client);
2766
2767 unhash_delegation(dp);
1da177e4 2768out:
203a8c8e
BF		 2769 nfs4_unlock_state();
2770
1da177e4
LT		 2771 return status;
2772}
2773
2774
2775/*
2776 * Lock owner state (byte-range locks)
2777 */
2778#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2779#define LOCK_HASH_BITS 8
2780#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2781#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2782
87df4de8
BH		 2783static inline u64
2784end_offset(u64 start, u64 len)
2785{
2786 u64 end;
2787
2788 end = start + len;
2789 return end >= start ? end: NFS4_MAX_UINT64;
2790}
2791
2792/* last octet in a range */
2793static inline u64
2794last_byte_offset(u64 start, u64 len)
2795{
2796 u64 end;
2797
2798 BUG_ON(!len);
2799 end = start + len;
2800 return end > start ? end - 1: NFS4_MAX_UINT64;
2801}
2802
1da177e4
LT		 2803#define lockownerid_hashval(id) \
2804 ((id) & LOCK_HASH_MASK)
2805
2806static inline unsigned int
2807lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2808 struct xdr_netobj *ownername)
2809{
2810 return (file_hashval(inode) + cl_id
2811 + opaque_hashval(ownername->data, ownername->len))
2812 & LOCK_HASH_MASK;
2813}
2814
2815static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2816static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2817static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2818
fd39ca9a 2819static struct nfs4_stateid *
1da177e4
LT		 2820find_stateid(stateid_t *stid, int flags)
2821{
9346eff0 2822 struct nfs4_stateid *local;
1da177e4
LT		 2823 u32 st_id = stid->si_stateownerid;
2824 u32 f_id = stid->si_fileid;
2825 unsigned int hashval;
2826
2827 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2828 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2829 hashval = stateid_hashval(st_id, f_id);
2830 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2831 if ((local->st_stateid.si_stateownerid == st_id) &&
2832 (local->st_stateid.si_fileid == f_id))
2833 return local;
2834 }
2835 }
9346eff0
KK		 2836
2837 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2838 hashval = stateid_hashval(st_id, f_id);
2839 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2840 if ((local->st_stateid.si_stateownerid == st_id) &&
2841 (local->st_stateid.si_fileid == f_id))
2842 return local;
2843 }
849823c5 2844 }
1da177e4
LT		 2845 return NULL;
2846}
2847
2848static struct nfs4_delegation *
2849find_delegation_stateid(struct inode *ino, stateid_t *stid)
2850{
13cd2184
N		 2851 struct nfs4_file *fp;
2852 struct nfs4_delegation *dl;
1da177e4
LT		 2853
2854 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2855 stid->si_boot, stid->si_stateownerid,
2856 stid->si_fileid, stid->si_generation);
2857
1da177e4 2858 fp = find_file(ino);
13cd2184
N		 2859 if (!fp)
2860 return NULL;
2861 dl = find_delegation_file(fp, stid);
2862 put_nfs4_file(fp);
2863 return dl;
1da177e4
LT		 2864}
2865
2866/*
2867 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2868 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2869 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2870 * locking, this prevents us from being completely protocol-compliant. The
2871 * real solution to this problem is to start using unsigned file offsets in
2872 * the VFS, but this is a very deep change!
2873 */
2874static inline void
2875nfs4_transform_lock_offset(struct file_lock *lock)
2876{
2877 if (lock->fl_start < 0)
2878 lock->fl_start = OFFSET_MAX;
2879 if (lock->fl_end < 0)
2880 lock->fl_end = OFFSET_MAX;
2881}
2882
d5b9026a
N		 2883/* Hack!: For now, we're defining this just so we can use a pointer to it
2884 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2885static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2886};
1da177e4
LT		 2887
2888static inline void
2889nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2890{
d5b9026a
N		 2891 struct nfs4_stateowner *sop;
2892 unsigned int hval;
1da177e4 2893
d5b9026a
N		 2894 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2895 sop = (struct nfs4_stateowner *) fl->fl_owner;
2896 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2897 kref_get(&sop->so_ref);
2898 deny->ld_sop = sop;
2899 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2900 } else {
2901 deny->ld_sop = NULL;
2902 deny->ld_clientid.cl_boot = 0;
2903 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2904 }
2905 deny->ld_start = fl->fl_start;
87df4de8
BH		 2906 deny->ld_length = NFS4_MAX_UINT64;
2907 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2908 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2909 deny->ld_type = NFS4_READ_LT;
2910 if (fl->fl_type != F_RDLCK)
2911 deny->ld_type = NFS4_WRITE_LT;
2912}
2913
1da177e4
LT		 2914static struct nfs4_stateowner *
2915find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2916 struct xdr_netobj *owner)
2917{
2918 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2919 struct nfs4_stateowner *op;
2920
2921 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2922 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2923 return op;
2924 }
2925 return NULL;
2926}
2927
2928/*
2929 * Alloc a lock owner structure.
2930 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2931 * occured.
2932 *
2933 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2934 */
2935
2936static struct nfs4_stateowner *
2937alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2938 struct nfs4_stateowner *sop;
2939 struct nfs4_replay *rp;
2940 unsigned int idhashval;
2941
2942 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2943 return NULL;
2944 idhashval = lockownerid_hashval(current_ownerid);
2945 INIT_LIST_HEAD(&sop->so_idhash);
2946 INIT_LIST_HEAD(&sop->so_strhash);
2947 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2948 INIT_LIST_HEAD(&sop->so_stateids);
2949 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2950 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2951 sop->so_time = 0;
2952 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2953 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2954 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2955 sop->so_is_open_owner = 0;
2956 sop->so_id = current_ownerid++;
2957 sop->so_client = clp;
b59e3c0e
NB		 2958 /* It is the openowner seqid that will be incremented in encode in the
2959 * case of new lockowners; so increment the lock seqid manually: */
2960 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2961 sop->so_confirmed = 1;
2962 rp = &sop->so_replay;
de1ae286 2963 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2964 rp->rp_buflen = 0;
2965 rp->rp_buf = rp->rp_ibuf;
2966 return sop;
2967}
2968
fd39ca9a 2969static struct nfs4_stateid *
1da177e4
LT		 2970alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2971{
2972 struct nfs4_stateid *stp;
2973 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2974
5ac049ac
N		 2975 stp = nfs4_alloc_stateid();
2976 if (stp == NULL)
1da177e4
LT		 2977 goto out;
2978 INIT_LIST_HEAD(&stp->st_hash);
2979 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2980 INIT_LIST_HEAD(&stp->st_perstateowner);
2981 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2982 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2983 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2984 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2985 stp->st_stateowner = sop;
13cd2184 2986 get_nfs4_file(fp);
1da177e4
LT		 2987 stp->st_file = fp;
2988 stp->st_stateid.si_boot = boot_time;
2989 stp->st_stateid.si_stateownerid = sop->so_id;
2990 stp->st_stateid.si_fileid = fp->fi_id;
2991 stp->st_stateid.si_generation = 0;
2992 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2993 stp->st_access_bmap = open_stp->st_access_bmap;
2994 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2995 stp->st_openstp = open_stp;
1da177e4
LT		 2996
2997out:
2998 return stp;
2999}
3000
fd39ca9a 3001static int
1da177e4
LT		 3002check_lock_length(u64 offset, u64 length)
3003{
87df4de8 3004 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3005 LOFF_OVERFLOW(offset, length)));
3006}
3007
3008/*
3009 * LOCK operation
3010 */
b37ad28b 3011__be32
ca364317 3012nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3013 struct nfsd4_lock *lock)
1da177e4 3014{
3e9e3dbe 3015 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3016 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3017 struct nfs4_stateid *lock_stp;
3018 struct file *filp;
3019 struct file_lock file_lock;
8dc7c311 3020 struct file_lock conflock;
b37ad28b 3021 __be32 status = 0;
1da177e4 3022 unsigned int strhashval;
150b3934 3023 unsigned int cmd;
b8dd7b9a 3024 int err;
1da177e4
LT		 3025
3026 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3027 (long long) lock->lk_offset,
3028 (long long) lock->lk_length);
3029
1da177e4
LT		 3030 if (check_lock_length(lock->lk_offset, lock->lk_length))
3031 return nfserr_inval;
3032
ca364317 3033 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3034 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3035 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3036 return status;
3037 }
3038
1da177e4
LT		 3039 nfs4_lock_state();
3040
3041 if (lock->lk_is_new) {
893f8770
N		 3042 /*
3043 * Client indicates that this is a new lockowner.
3044 * Use open owner and open stateid to create lock owner and
3045 * lock stateid.
3046 */
1da177e4
LT		 3047 struct nfs4_stateid *open_stp = NULL;
3048 struct nfs4_file *fp;
3049
3050 status = nfserr_stale_clientid;
849823c5 3051 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3052 goto out;
1da177e4 3053
1da177e4 3054 /* validate and update open stateid and open seqid */
ca364317 3055 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3056 lock->lk_new_open_seqid,
3057 &lock->lk_new_open_stateid,
f3362737 3058 OPEN_STATE,
3a65588a 3059 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3060 lock);
37515177 3061 if (status)
1da177e4 3062 goto out;
3a65588a 3063 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3064 /* create lockowner and lock stateid */
3065 fp = open_stp->st_file;
3066 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3067 open_sop->so_client->cl_clientid.cl_id,
3068 &lock->v.new.owner);
3e9e3dbe
N		 3069 /* XXX: Do we need to check for duplicate stateowners on
3070 * the same file, or should they just be allowed (and
3071 * create new stateids)? */
1da177e4 3072 status = nfserr_resource;
b59e3c0e
NB		 3073 lock_sop = alloc_init_lock_stateowner(strhashval,
3074 open_sop->so_client, open_stp, lock);
3075 if (lock_sop == NULL)
1da177e4 3076 goto out;
b59e3c0e 3077 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3078 if (lock_stp == NULL)
1da177e4 3079 goto out;
1da177e4
LT		 3080 } else {
3081 /* lock (lock owner + lock stateid) already exists */
ca364317 3082 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3083 lock->lk_old_lock_seqid,
3084 &lock->lk_old_lock_stateid,
f3362737 3085 LOCK_STATE,
3a65588a 3086 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3087 if (status)
3088 goto out;
3a65588a 3089 lock_sop = lock->lk_replay_owner;
1da177e4 3090 }
3a65588a 3091 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3092 filp = lock_stp->st_vfs_file;
3093
0dd395dc 3094 status = nfserr_grace;
af558e33 3095 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3096 goto out;
3097 status = nfserr_no_grace;
af558e33 3098 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3099 goto out;
3100
1da177e4
LT		 3101 locks_init_lock(&file_lock);
3102 switch (lock->lk_type) {
3103 case NFS4_READ_LT:
3104 case NFS4_READW_LT:
3105 file_lock.fl_type = F_RDLCK;
150b3934 3106 cmd = F_SETLK;
1da177e4
LT		 3107 break;
3108 case NFS4_WRITE_LT:
3109 case NFS4_WRITEW_LT:
3110 file_lock.fl_type = F_WRLCK;
150b3934 3111 cmd = F_SETLK;
1da177e4
LT		 3112 break;
3113 default:
3114 status = nfserr_inval;
3115 goto out;
3116 }
b59e3c0e 3117 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3118 file_lock.fl_pid = current->tgid;
3119 file_lock.fl_file = filp;
3120 file_lock.fl_flags = FL_POSIX;
d5b9026a 3121 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3122
3123 file_lock.fl_start = lock->lk_offset;
87df4de8 3124 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3125 nfs4_transform_lock_offset(&file_lock);
3126
3127 /*
3128 * Try to lock the file in the VFS.
3129 * Note: locks.c uses the BKL to protect the inode's lock list.
3130 */
3131
fd85b817 3132 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3133 switch (-err) {
1da177e4
LT		 3134 case 0: /* success! */
3135 update_stateid(&lock_stp->st_stateid);
3136 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3137 sizeof(stateid_t));
b8dd7b9a 3138 status = 0;
eb76b3fd
AA		 3139 break;
3140 case (EAGAIN): /* conflock holds conflicting lock */
3141 status = nfserr_denied;
3142 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3143 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3144 break;
1da177e4
LT		 3145 case (EDEADLK):
3146 status = nfserr_deadlock;
eb76b3fd 3147 break;
1da177e4 3148 default:
fd85b817 3149 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3150 status = nfserr_resource;
3151 break;
1da177e4 3152 }
1da177e4 3153out:
8a280510 3154 if (status && lock->lk_is_new && lock_sop)
f044ff83 3155 release_lockowner(lock_sop);
3a65588a
BF		 3156 if (lock->lk_replay_owner) {
3157 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3158 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3159 }
1da177e4
LT		 3160 nfs4_unlock_state();
3161 return status;
3162}
3163
55ef1274
BF		 3164/*
3165 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3166 * so we do a temporary open here just to get an open file to pass to
3167 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3168 * inode operation.)
3169 */
3170static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3171{
3172 struct file *file;
3173 int err;
3174
3175 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3176 if (err)
3177 return err;
3178 err = vfs_test_lock(file, lock);
3179 nfsd_close(file);
3180 return err;
3181}
3182
1da177e4
LT		 3183/*
3184 * LOCKT operation
3185 */
b37ad28b 3186__be32
ca364317
BF		 3187nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3188 struct nfsd4_lockt *lockt)
1da177e4
LT		 3189{
3190 struct inode *inode;
1da177e4 3191 struct file_lock file_lock;
fd85b817 3192 int error;
b37ad28b 3193 __be32 status;
1da177e4 3194
af558e33 3195 if (locks_in_grace())
1da177e4
LT		 3196 return nfserr_grace;
3197
3198 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3199 return nfserr_inval;
3200
3201 lockt->lt_stateowner = NULL;
3202 nfs4_lock_state();
3203
3204 status = nfserr_stale_clientid;
849823c5 3205 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3206 goto out;
1da177e4 3207
ca364317 3208 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3209 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3210 if (status == nfserr_symlink)
3211 status = nfserr_inval;
3212 goto out;
3213 }
3214
ca364317 3215 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3216 locks_init_lock(&file_lock);
3217 switch (lockt->lt_type) {
3218 case NFS4_READ_LT:
3219 case NFS4_READW_LT:
3220 file_lock.fl_type = F_RDLCK;
3221 break;
3222 case NFS4_WRITE_LT:
3223 case NFS4_WRITEW_LT:
3224 file_lock.fl_type = F_WRLCK;
3225 break;
3226 default:
2fdada03 3227 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3228 status = nfserr_inval;
3229 goto out;
3230 }
3231
3232 lockt->lt_stateowner = find_lockstateowner_str(inode,
3233 &lockt->lt_clientid, &lockt->lt_owner);
3234 if (lockt->lt_stateowner)
3235 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3236 file_lock.fl_pid = current->tgid;
3237 file_lock.fl_flags = FL_POSIX;
3238
3239 file_lock.fl_start = lockt->lt_offset;
87df4de8 3240 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3241
3242 nfs4_transform_lock_offset(&file_lock);
3243
1da177e4 3244 status = nfs_ok;
55ef1274 3245 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3246 if (error) {
3247 status = nfserrno(error);
3248 goto out;
3249 }
9d6a8c5c 3250 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3251 status = nfserr_denied;
9d6a8c5c 3252 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3253 }
3254out:
3255 nfs4_unlock_state();
3256 return status;
3257}
3258
b37ad28b 3259__be32
ca364317 3260nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3261 struct nfsd4_locku *locku)
1da177e4
LT		 3262{
3263 struct nfs4_stateid *stp;
3264 struct file *filp = NULL;
3265 struct file_lock file_lock;
b37ad28b 3266 __be32 status;
b8dd7b9a 3267 int err;
1da177e4
LT		 3268
3269 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3270 (long long) locku->lu_offset,
3271 (long long) locku->lu_length);
3272
3273 if (check_lock_length(locku->lu_offset, locku->lu_length))
3274 return nfserr_inval;
3275
3276 nfs4_lock_state();
3277
ca364317 3278 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3279 locku->lu_seqid,
3280 &locku->lu_stateid,
f3362737 3281 LOCK_STATE,
1da177e4
LT		 3282 &locku->lu_stateowner, &stp, NULL)))
3283 goto out;
3284
3285 filp = stp->st_vfs_file;
3286 BUG_ON(!filp);
3287 locks_init_lock(&file_lock);
3288 file_lock.fl_type = F_UNLCK;
3289 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3290 file_lock.fl_pid = current->tgid;
3291 file_lock.fl_file = filp;
3292 file_lock.fl_flags = FL_POSIX;
d5b9026a 3293 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3294 file_lock.fl_start = locku->lu_offset;
3295
87df4de8 3296 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3297 nfs4_transform_lock_offset(&file_lock);
3298
3299 /*
3300 * Try to unlock the file in the VFS.
3301 */
fd85b817 3302 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3303 if (err) {
fd85b817 3304 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3305 goto out_nfserr;
3306 }
3307 /*
3308 * OK, unlock succeeded; the only thing left to do is update the stateid.
3309 */
3310 update_stateid(&stp->st_stateid);
3311 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3312
3313out:
f2327d9a 3314 if (locku->lu_stateowner) {
1da177e4 3315 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3316 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3317 }
1da177e4
LT		 3318 nfs4_unlock_state();
3319 return status;
3320
3321out_nfserr:
b8dd7b9a 3322 status = nfserrno(err);
1da177e4
LT		 3323 goto out;
3324}
3325
3326/*
3327 * returns
3328 * 1: locks held by lockowner
3329 * 0: no locks held by lockowner
3330 */
3331static int
3332check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3333{
3334 struct file_lock **flpp;
7eaa36e2 3335 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3336 int status = 0;
3337
3338 lock_kernel();
3339 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3340 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3341 status = 1;
3342 goto out;
796dadfd 3343 }
1da177e4
LT		 3344 }
3345out:
3346 unlock_kernel();
3347 return status;
3348}
3349
b37ad28b 3350__be32
b591480b
BF		 3351nfsd4_release_lockowner(struct svc_rqst *rqstp,
3352 struct nfsd4_compound_state *cstate,
3353 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3354{
3355 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3356 struct nfs4_stateowner *sop;
3357 struct nfs4_stateid *stp;
1da177e4 3358 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3359 struct list_head matches;
3360 int i;
b37ad28b 3361 __be32 status;
1da177e4
LT		 3362
3363 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3364 clid->cl_boot, clid->cl_id);
3365
3366 /* XXX check for lease expiration */
3367
3368 status = nfserr_stale_clientid;
849823c5 3369 if (STALE_CLIENTID(clid))
1da177e4 3370 return status;
1da177e4
LT		 3371
3372 nfs4_lock_state();
3373
3e9e3dbe
N		 3374 status = nfserr_locks_held;
3375 /* XXX: we're doing a linear search through all the lockowners.
3376 * Yipes! For now we'll just hope clients aren't really using
3377 * release_lockowner much, but eventually we have to fix these
3378 * data structures. */
3379 INIT_LIST_HEAD(&matches);
3380 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3381 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3382 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3383 continue;
3384 list_for_each_entry(stp, &sop->so_stateids,
3385 st_perstateowner) {
3386 if (check_for_locks(stp->st_vfs_file, sop))
3387 goto out;
3388 /* Note: so_perclient unused for lockowners,
3389 * so it's OK to fool with here. */
3390 list_add(&sop->so_perclient, &matches);
3391 }
1da177e4 3392 }
3e9e3dbe
N		 3393 }
3394 /* Clients probably won't expect us to return with some (but not all)
3395 * of the lockowner state released; so don't release any until all
3396 * have been checked. */
3397 status = nfs_ok;
0fa822e4
N		 3398 while (!list_empty(&matches)) {
3399 sop = list_entry(matches.next, struct nfs4_stateowner,
3400 so_perclient);
3401 /* unhash_stateowner deletes so_perclient only
3402 * for openowners. */
3403 list_del(&sop->so_perclient);
f044ff83 3404 release_lockowner(sop);
1da177e4
LT		 3405 }
3406out:
3407 nfs4_unlock_state();
3408 return status;
3409}
3410
3411static inline struct nfs4_client_reclaim *
a55370a3 3412alloc_reclaim(void)
1da177e4 3413{
a55370a3 3414 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3415}
3416
c7b9a459 3417int
a1bcecd2 3418nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3419{
3420 unsigned int strhashval = clientstr_hashval(name);
3421 struct nfs4_client *clp;
3422
a1bcecd2 3423 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3424 return clp ? 1 : 0;
3425}
3426
1da177e4
LT		 3427/*
3428 * failure => all reset bets are off, nfserr_no_grace...
3429 */
190e4fbf
N		 3430int
3431nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3432{
3433 unsigned int strhashval;
3434 struct nfs4_client_reclaim *crp = NULL;
3435
a55370a3
N		 3436 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3437 crp = alloc_reclaim();
1da177e4
LT		 3438 if (!crp)
3439 return 0;
a55370a3 3440 strhashval = clientstr_hashval(name);
1da177e4
LT		 3441 INIT_LIST_HEAD(&crp->cr_strhash);
3442 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3443 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3444 reclaim_str_hashtbl_size++;
3445 return 1;
3446}
3447
3448static void
3449nfs4_release_reclaim(void)
3450{
3451 struct nfs4_client_reclaim *crp = NULL;
3452 int i;
3453
1da177e4
LT		 3454 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3455 while (!list_empty(&reclaim_str_hashtbl[i])) {
3456 crp = list_entry(reclaim_str_hashtbl[i].next,
3457 struct nfs4_client_reclaim, cr_strhash);
3458 list_del(&crp->cr_strhash);
1da177e4
LT		 3459 kfree(crp);
3460 reclaim_str_hashtbl_size--;
3461 }
3462 }
3463 BUG_ON(reclaim_str_hashtbl_size);
3464}
3465
3466/*
3467 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3468static struct nfs4_client_reclaim *
1da177e4
LT		 3469nfs4_find_reclaim_client(clientid_t *clid)
3470{
3471 unsigned int strhashval;
3472 struct nfs4_client *clp;
3473 struct nfs4_client_reclaim *crp = NULL;
3474
3475
3476 /* find clientid in conf_id_hashtbl */
3477 clp = find_confirmed_client(clid);
3478 if (clp == NULL)
3479 return NULL;
3480
a55370a3
N		 3481 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3482 clp->cl_name.len, clp->cl_name.data,
3483 clp->cl_recdir);
1da177e4
LT		 3484
3485 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3486 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3487 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3488 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3489 return crp;
3490 }
3491 }
3492 return NULL;
3493}
3494
3495/*
3496* Called from OPEN. Look for clientid in reclaim list.
3497*/
b37ad28b 3498__be32
1da177e4
LT		 3499nfs4_check_open_reclaim(clientid_t *clid)
3500{
dfc83565 3501 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3502}
3503
ac4d8ff2 3504/* initialization to perform at module load time: */
1da177e4 3505
e8ff2a84 3506int
ac4d8ff2 3507nfs4_state_init(void)
1da177e4 3508{
e8ff2a84 3509 int i, status;
1da177e4 3510
e8ff2a84
BF		 3511 status = nfsd4_init_slabs();
3512 if (status)
3513 return status;
1da177e4
LT		 3514 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3515 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3516 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3517 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3518 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3519 }
5282fd72
ME		 3520 for (i = 0; i < SESSION_HASH_SIZE; i++)
3521 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3522 for (i = 0; i < FILE_HASH_SIZE; i++) {
3523 INIT_LIST_HEAD(&file_hashtbl[i]);
3524 }
3525 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3526 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3527 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3528 }
3529 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3530 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3531 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3532 }
3533 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3534 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3535 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3536 }
1da177e4 3537 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3538 INIT_LIST_HEAD(&close_lru);
3539 INIT_LIST_HEAD(&client_lru);
3540 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3541 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3542 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3543 reclaim_str_hashtbl_size = 0;
e8ff2a84 3544 return 0;
ac4d8ff2
N		 3545}
3546
190e4fbf
N		 3547static void
3548nfsd4_load_reboot_recovery_data(void)
3549{
3550 int status;
3551
0964a3d3
N		 3552 nfs4_lock_state();
3553 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3554 status = nfsd4_recdir_load();
0964a3d3 3555 nfs4_unlock_state();
190e4fbf
N		 3556 if (status)
3557 printk("NFSD: Failure reading reboot recovery data\n");
3558}
3559
9a8db97e
ME		 3560unsigned long
3561get_nfs4_grace_period(void)
3562{
3563 return max(user_lease_time, lease_time) * HZ;
3564}
3565
c2f1a551
MS		 3566/*
3567 * Since the lifetime of a delegation isn't limited to that of an open, a
3568 * client may quite reasonably hang on to a delegation as long as it has
3569 * the inode cached. This becomes an obvious problem the first time a
3570 * client's inode cache approaches the size of the server's total memory.
3571 *
3572 * For now we avoid this problem by imposing a hard limit on the number
3573 * of delegations, which varies according to the server's memory size.
3574 */
3575static void
3576set_max_delegations(void)
3577{
3578 /*
3579 * Allow at most 4 delegations per megabyte of RAM. Quick
3580 * estimates suggest that in the worst case (where every delegation
3581 * is for a different inode), a delegation could take about 1.5K,
3582 * giving a worst case usage of about 6% of memory.
3583 */
3584 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3585}
3586
ac4d8ff2
N		 3587/* initialization to perform when the nfsd service is started: */
3588
3589static void
3590__nfs4_state_start(void)
3591{
9a8db97e 3592 unsigned long grace_time;
ac4d8ff2 3593
1da177e4 3594 boot_time = get_seconds();
af558e33 3595 grace_time = get_nfs4_grace_period();
d99a05ad 3596 lease_time = user_lease_time;
af558e33 3597 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3598 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3599 grace_time/HZ);
58da282b 3600 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3601 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3602 set_max_delegations();
1da177e4
LT		 3603}
3604
e8ff2a84 3605void
76a3550e 3606nfs4_state_start(void)
1da177e4 3607{
1da177e4 3608 if (nfs4_init)
e8ff2a84 3609 return;
190e4fbf 3610 nfsd4_load_reboot_recovery_data();
76a3550e 3611 __nfs4_state_start();
1da177e4 3612 nfs4_init = 1;
e8ff2a84 3613 return;
1da177e4
LT		 3614}
3615
1da177e4
LT		 3616time_t
3617nfs4_lease_time(void)
3618{
3619 return lease_time;
3620}
3621
3622static void
3623__nfs4_state_shutdown(void)
3624{
3625 int i;
3626 struct nfs4_client *clp = NULL;
3627 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3628 struct list_head *pos, *next, reaplist;
3629
1da177e4
LT		 3630 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3631 while (!list_empty(&conf_id_hashtbl[i])) {
3632 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3633 expire_client(clp);
3634 }
3635 while (!list_empty(&unconf_str_hashtbl[i])) {
3636 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3637 expire_client(clp);
3638 }
3639 }
3640 INIT_LIST_HEAD(&reaplist);
3641 spin_lock(&recall_lock);
3642 list_for_each_safe(pos, next, &del_recall_lru) {
3643 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3644 list_move(&dp->dl_recall_lru, &reaplist);
3645 }
3646 spin_unlock(&recall_lock);
3647 list_for_each_safe(pos, next, &reaplist) {
3648 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3649 list_del_init(&dp->dl_recall_lru);
3650 unhash_delegation(dp);
3651 }
3652
190e4fbf 3653 nfsd4_shutdown_recdir();
1da177e4 3654 nfs4_init = 0;
1da177e4
LT		 3655}
3656
3657void
3658nfs4_state_shutdown(void)
3659{
5e8d5c29
N		 3660 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3661 destroy_workqueue(laundry_wq);
2c5e7615 3662 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3663 nfs4_lock_state();
3664 nfs4_release_reclaim();
3665 __nfs4_state_shutdown();
1da177e4
LT		 3666 nfs4_unlock_state();
3667}
3668
3dd98a3b
JL		 3669/*
3670 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3671 * accessed when nfsd is starting.
3672 */
0964a3d3
N		 3673static void
3674nfs4_set_recdir(char *recdir)
3675{
0964a3d3 3676 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3677}
3678
3679/*
3680 * Change the NFSv4 recovery directory to recdir.
3681 */
3682int
3683nfs4_reset_recoverydir(char *recdir)
3684{
3685 int status;
a63bb996 3686 struct path path;
0964a3d3 3687
a63bb996 3688 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3689 if (status)
3690 return status;
3691 status = -ENOTDIR;
a63bb996 3692 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3693 nfs4_set_recdir(recdir);
3694 status = 0;
3695 }
a63bb996 3696 path_put(&path);
0964a3d3
N		 3697 return status;
3698}
3699
3dd98a3b
JL		 3700char *
3701nfs4_recoverydir(void)
3702{
3703 return user_recovery_dirname;
3704}
3705
1da177e4
LT		 3706/*
3707 * Called when leasetime is changed.
3708 *
d99a05ad
N		 3709 * The only way the protocol gives us to handle on-the-fly lease changes is to
3710 * simulate a reboot. Instead of doing that, we just wait till the next time
3711 * we start to register any changes in lease time. If the administrator
3712 * really wants to change the lease time *now*, they can go ahead and bring
3713 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3714 *
3715 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3716 * when nfsd is starting
1da177e4
LT		 3717 */
3718void
3719nfs4_reset_lease(time_t leasetime)
3720{
d99a05ad 3721 user_lease_time = leasetime;
1da177e4 3722}
Linux 6.x block layer and io_uring tree(s)