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nfsd41: enforce NFS4ERR_SEQUENCE_POS operation order rules for minorversion != 0...
[deliverable/linux.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4 80
8b671b80
BF		 81/* Locking: */
82
83/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 84static DEFINE_MUTEX(client_mutex);
1da177e4 85
8b671b80
BF		 86/*
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
90 */
91static DEFINE_SPINLOCK(recall_lock);
92
e18b890b
CL		 93static struct kmem_cache *stateowner_slab = NULL;
94static struct kmem_cache *file_slab = NULL;
95static struct kmem_cache *stateid_slab = NULL;
96static struct kmem_cache *deleg_slab = NULL;
e60d4398 97
1da177e4
LT		 98void
99nfs4_lock_state(void)
100{
353ab6e9 101 mutex_lock(&client_mutex);
1da177e4
LT		 102}
103
104void
105nfs4_unlock_state(void)
106{
353ab6e9 107 mutex_unlock(&client_mutex);
1da177e4
LT		 108}
109
110static inline u32
111opaque_hashval(const void *ptr, int nbytes)
112{
113 unsigned char *cptr = (unsigned char *) ptr;
114
115 u32 x = 0;
116 while (nbytes--) {
117 x *= 37;
118 x += *cptr++;
119 }
120 return x;
121}
122
1da177e4
LT		 123static struct list_head del_recall_lru;
124
13cd2184
N		 125static inline void
126put_nfs4_file(struct nfs4_file *fi)
127{
8b671b80
BF		 128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
131 iput(fi->fi_inode);
132 kmem_cache_free(file_slab, fi);
133 }
13cd2184
N		 134}
135
136static inline void
137get_nfs4_file(struct nfs4_file *fi)
138{
8b671b80 139 atomic_inc(&fi->fi_ref);
13cd2184
N		 140}
141
ef0f3390 142static int num_delegations;
c2f1a551 143unsigned int max_delegations;
ef0f3390
N		 144
145/*
146 * Open owner state (share locks)
147 */
148
149/* hash tables for nfs4_stateowner */
150#define OWNER_HASH_BITS 8
151#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
153
154#define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156#define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
158
159static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
161
162/* hash table for nfs4_file */
163#define FILE_HASH_BITS 8
164#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166/* hash table for (open)nfs4_stateid */
167#define STATEID_HASH_BITS 10
168#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
170
171#define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173#define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
175
176static struct list_head file_hashtbl[FILE_HASH_SIZE];
177static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
178
1da177e4
LT		 179static struct nfs4_delegation *
180alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
181{
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
185
186 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 187 if (fp->fi_had_conflict)
188 return NULL;
c2f1a551 189 if (num_delegations > max_delegations)
ef0f3390 190 return NULL;
5b2d21c1
N		 191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
192 if (dp == NULL)
1da177e4 193 return dp;
ef0f3390 194 num_delegations++;
ea1da636
N		 195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 197 INIT_LIST_HEAD(&dp->dl_recall_lru);
198 dp->dl_client = clp;
13cd2184 199 get_nfs4_file(fp);
1da177e4
LT		 200 dp->dl_file = fp;
201 dp->dl_flock = NULL;
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
204 dp->dl_type = type;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
6c02eaa1 212 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 213 dp->dl_time = 0;
214 atomic_set(&dp->dl_count, 1);
ea1da636
N		 215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 217 return dp;
218}
219
220void
221nfs4_put_delegation(struct nfs4_delegation *dp)
222{
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 225 put_nfs4_file(dp->dl_file);
5b2d21c1 226 kmem_cache_free(deleg_slab, dp);
ef0f3390 227 num_delegations--;
1da177e4
LT		 228 }
229}
230
231/* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
235 */
236static void
237nfs4_close_delegation(struct nfs4_delegation *dp)
238{
239 struct file *filp = dp->dl_vfs_file;
240
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
c907132d 245 if (dp->dl_flock)
a9933cea 246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 247 nfsd_close(filp);
1da177e4
LT		 248}
249
250/* Called under the state lock. */
251static void
252unhash_delegation(struct nfs4_delegation *dp)
253{
ea1da636
N		 254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
261}
262
263/*
264 * SETCLIENTID state
265 */
266
267/* Hash tables for nfs4_clientid state */
268#define CLIENT_HASH_BITS 4
269#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
271
272#define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 274#define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 276/*
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
279 *
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
282 *
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
284 * setclientid info.
285 *
286 * client_lru holds client queue ordered by nfs4_client.cl_time
287 * for lease renewal.
288 *
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
291 */
292static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293static int reclaim_str_hashtbl_size = 0;
294static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298static struct list_head client_lru;
299static struct list_head close_lru;
300
2283963f
BF		 301static void unhash_generic_stateid(struct nfs4_stateid *stp)
302{
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
306}
307
308static void free_generic_stateid(struct nfs4_stateid *stp)
309{
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
312}
313
314static void release_lock_stateid(struct nfs4_stateid *stp)
315{
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
319}
320
f044ff83
BF		 321static void unhash_lockowner(struct nfs4_stateowner *sop)
322{
323 struct nfs4_stateid *stp;
324
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
332 }
333}
334
335static void release_lockowner(struct nfs4_stateowner *sop)
336{
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
339}
340
f1d110ca
BF		 341static void
342release_stateid_lockowners(struct nfs4_stateid *open_stp)
343{
344 struct nfs4_stateowner *lock_sop;
345
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 351 release_lockowner(lock_sop);
f1d110ca
BF		 352 }
353}
354
2283963f
BF		 355static void release_open_stateid(struct nfs4_stateid *stp)
356{
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
361}
362
f044ff83 363static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 364{
365 struct nfs4_stateid *stp;
366
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
f044ff83
BF		 369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 371 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
f1d110ca
BF		 375 }
376}
377
f044ff83 378static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 379{
f044ff83 380 unhash_openowner(sop);
f1d110ca
BF		 381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
383}
384
5282fd72
ME		 385static DEFINE_SPINLOCK(sessionid_lock);
386#define SESSION_HASH_SIZE 512
387static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
388
389static inline int
390hash_sessionid(struct nfs4_sessionid *sessionid)
391{
392 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
393
394 return sid->sequence % SESSION_HASH_SIZE;
395}
396
397static inline void
398dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
399{
400 u32 *ptr = (u32 *)(&sessionid->data[0]);
401 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
402}
403
404/* caller must hold sessionid_lock */
405static struct nfsd4_session *
406find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
407{
408 struct nfsd4_session *elem;
409 int idx;
410
411 dump_sessionid(__func__, sessionid);
412 idx = hash_sessionid(sessionid);
413 dprintk("%s: idx is %d\n", __func__, idx);
414 /* Search in the appropriate list */
415 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
416 dump_sessionid("list traversal", &elem->se_sessionid);
417 if (!memcmp(elem->se_sessionid.data, sessionid->data,
418 NFS4_MAX_SESSIONID_LEN)) {
419 return elem;
420 }
421 }
422
423 dprintk("%s: session not found\n", __func__);
424 return NULL;
425}
426
427/* caller must hold sessionid_lock */
7116ed6b 428static void
5282fd72 429unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 430{
431 list_del(&ses->se_hash);
432 list_del(&ses->se_perclnt);
5282fd72
ME		 433}
434
435static void
436release_session(struct nfsd4_session *ses)
437{
438 spin_lock(&sessionid_lock);
439 unhash_session(ses);
440 spin_unlock(&sessionid_lock);
7116ed6b
AA		 441 nfsd4_put_session(ses);
442}
443
444void
445free_session(struct kref *kref)
446{
447 struct nfsd4_session *ses;
448
449 ses = container_of(kref, struct nfsd4_session, se_ref);
450 kfree(ses->se_slots);
451 kfree(ses);
452}
453
1da177e4
LT		 454static inline void
455renew_client(struct nfs4_client *clp)
456{
457 /*
458 * Move client to the end to the LRU list.
459 */
460 dprintk("renewing client (clientid %08x/%08x)\n",
461 clp->cl_clientid.cl_boot,
462 clp->cl_clientid.cl_id);
463 list_move_tail(&clp->cl_lru, &client_lru);
464 clp->cl_time = get_seconds();
465}
466
467/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
468static int
469STALE_CLIENTID(clientid_t *clid)
470{
471 if (clid->cl_boot == boot_time)
472 return 0;
473 dprintk("NFSD stale clientid (%08x/%08x)\n",
474 clid->cl_boot, clid->cl_id);
475 return 1;
476}
477
478/*
479 * XXX Should we use a slab cache ?
480 * This type of memory management is somewhat inefficient, but we use it
481 * anyway since SETCLIENTID is not a common operation.
482 */
35bba9a3 483static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 484{
485 struct nfs4_client *clp;
486
35bba9a3
BF		 487 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
488 if (clp == NULL)
489 return NULL;
490 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
491 if (clp->cl_name.data == NULL) {
492 kfree(clp);
493 return NULL;
1da177e4 494 }
35bba9a3
BF		 495 memcpy(clp->cl_name.data, name.data, name.len);
496 clp->cl_name.len = name.len;
1da177e4
LT		 497 return clp;
498}
499
1b1a9b31
BF		 500static void
501shutdown_callback_client(struct nfs4_client *clp)
502{
503 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
504
1b1a9b31 505 if (clnt) {
404ec117
BF		 506 /*
507 * Callback threads take a reference on the client, so there
508 * should be no outstanding callbacks at this point.
509 */
1b1a9b31
BF		 510 clp->cl_callback.cb_client = NULL;
511 rpc_shutdown_client(clnt);
512 }
513}
514
1da177e4
LT		 515static inline void
516free_client(struct nfs4_client *clp)
517{
1b1a9b31 518 shutdown_callback_client(clp);
1da177e4
LT		 519 if (clp->cl_cred.cr_group_info)
520 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 521 kfree(clp->cl_principal);
1da177e4
LT		 522 kfree(clp->cl_name.data);
523 kfree(clp);
524}
525
526void
527put_nfs4_client(struct nfs4_client *clp)
528{
529 if (atomic_dec_and_test(&clp->cl_count))
530 free_client(clp);
531}
532
533static void
534expire_client(struct nfs4_client *clp)
535{
536 struct nfs4_stateowner *sop;
537 struct nfs4_delegation *dp;
1da177e4
LT		 538 struct list_head reaplist;
539
540 dprintk("NFSD: expire_client cl_count %d\n",
541 atomic_read(&clp->cl_count));
542
1da177e4
LT		 543 INIT_LIST_HEAD(&reaplist);
544 spin_lock(&recall_lock);
ea1da636
N		 545 while (!list_empty(&clp->cl_delegations)) {
546 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 547 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
548 dp->dl_flock);
ea1da636 549 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 550 list_move(&dp->dl_recall_lru, &reaplist);
551 }
552 spin_unlock(&recall_lock);
553 while (!list_empty(&reaplist)) {
554 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
555 list_del_init(&dp->dl_recall_lru);
556 unhash_delegation(dp);
557 }
558 list_del(&clp->cl_idhash);
559 list_del(&clp->cl_strhash);
560 list_del(&clp->cl_lru);
ea1da636
N		 561 while (!list_empty(&clp->cl_openowners)) {
562 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 563 release_openowner(sop);
1da177e4 564 }
c4bf7868
ME		 565 while (!list_empty(&clp->cl_sessions)) {
566 struct nfsd4_session *ses;
567 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
568 se_perclnt);
569 release_session(ses);
570 }
1da177e4
LT		 571 put_nfs4_client(clp);
572}
573
35bba9a3
BF		 574static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
575{
1da177e4
LT		 576 struct nfs4_client *clp;
577
35bba9a3
BF		 578 clp = alloc_client(name);
579 if (clp == NULL)
580 return NULL;
a55370a3 581 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 582 atomic_set(&clp->cl_count, 1);
583 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 584 INIT_LIST_HEAD(&clp->cl_idhash);
585 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 586 INIT_LIST_HEAD(&clp->cl_openowners);
587 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 588 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 589 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 590 return clp;
591}
592
35bba9a3
BF		 593static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
594{
595 memcpy(target->cl_verifier.data, source->data,
596 sizeof(target->cl_verifier.data));
1da177e4
LT		 597}
598
35bba9a3
BF		 599static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
600{
1da177e4
LT		 601 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
602 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
603}
604
35bba9a3
BF		 605static void copy_cred(struct svc_cred *target, struct svc_cred *source)
606{
1da177e4
LT		 607 target->cr_uid = source->cr_uid;
608 target->cr_gid = source->cr_gid;
609 target->cr_group_info = source->cr_group_info;
610 get_group_info(target->cr_group_info);
611}
612
35bba9a3 613static int same_name(const char *n1, const char *n2)
599e0a22 614{
a55370a3 615 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 616}
617
618static int
599e0a22
BF		 619same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
620{
621 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 622}
623
624static int
599e0a22
BF		 625same_clid(clientid_t *cl1, clientid_t *cl2)
626{
627 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 628}
629
630/* XXX what about NGROUP */
631static int
599e0a22
BF		 632same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
633{
634 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 635}
636
5ec7b46c
BF		 637static void gen_clid(struct nfs4_client *clp)
638{
639 static u32 current_clientid = 1;
640
1da177e4
LT		 641 clp->cl_clientid.cl_boot = boot_time;
642 clp->cl_clientid.cl_id = current_clientid++;
643}
644
deda2faa
BF		 645static void gen_confirm(struct nfs4_client *clp)
646{
647 static u32 i;
648 u32 *p;
1da177e4 649
1da177e4 650 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 651 *p++ = get_seconds();
652 *p++ = i++;
1da177e4
LT		 653}
654
35bba9a3
BF		 655static int check_name(struct xdr_netobj name)
656{
1da177e4
LT		 657 if (name.len == 0)
658 return 0;
659 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 660 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 661 return 0;
662 }
663 return 1;
664}
665
fd39ca9a 666static void
1da177e4
LT		 667add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
668{
669 unsigned int idhashval;
670
671 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
672 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
673 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
674 list_add_tail(&clp->cl_lru, &client_lru);
675 clp->cl_time = get_seconds();
676}
677
fd39ca9a 678static void
1da177e4
LT		 679move_to_confirmed(struct nfs4_client *clp)
680{
681 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
682 unsigned int strhashval;
683
684 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
685 list_del_init(&clp->cl_strhash);
f116629d 686 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 687 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 688 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
689 renew_client(clp);
690}
691
692static struct nfs4_client *
693find_confirmed_client(clientid_t *clid)
694{
695 struct nfs4_client *clp;
696 unsigned int idhashval = clientid_hashval(clid->cl_id);
697
698 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 699 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 700 return clp;
701 }
702 return NULL;
703}
704
705static struct nfs4_client *
706find_unconfirmed_client(clientid_t *clid)
707{
708 struct nfs4_client *clp;
709 unsigned int idhashval = clientid_hashval(clid->cl_id);
710
711 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 712 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 713 return clp;
714 }
715 return NULL;
716}
717
a1bcecd2
AA		 718/*
719 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
720 * parameter. Matching is based on the fact the at least one of the
721 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
722 *
723 * FIXME: we need to unify the clientid namespaces for nfsv4.x
724 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
725 * and SET_CLIENTID{,_CONFIRM}
726 */
727static inline int
728match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
729{
730 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
731 return use_exchange_id == has_exchange_flags;
732}
733
28ce6054 734static struct nfs4_client *
a1bcecd2
AA		 735find_confirmed_client_by_str(const char *dname, unsigned int hashval,
736 bool use_exchange_id)
28ce6054
N		 737{
738 struct nfs4_client *clp;
739
740 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 741 if (same_name(clp->cl_recdir, dname) &&
742 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 743 return clp;
744 }
745 return NULL;
746}
747
748static struct nfs4_client *
a1bcecd2
AA		 749find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
750 bool use_exchange_id)
28ce6054
N		 751{
752 struct nfs4_client *clp;
753
754 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 755 if (same_name(clp->cl_recdir, dname) &&
756 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 757 return clp;
758 }
759 return NULL;
760}
761
1da177e4
LT		 762/* a helper function for parse_callback */
763static int
764parse_octet(unsigned int *lenp, char **addrp)
765{
766 unsigned int len = *lenp;
767 char *p = *addrp;
768 int n = -1;
769 char c;
770
771 for (;;) {
772 if (!len)
773 break;
774 len--;
775 c = *p++;
776 if (c == '.')
777 break;
778 if ((c < '0') || (c > '9')) {
779 n = -1;
780 break;
781 }
782 if (n < 0)
783 n = 0;
784 n = (n * 10) + (c - '0');
785 if (n > 255) {
786 n = -1;
787 break;
788 }
789 }
790 *lenp = len;
791 *addrp = p;
792 return n;
793}
794
795/* parse and set the setclientid ipv4 callback address */
fd39ca9a 796static int
1da177e4
LT		 797parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
798{
799 int temp = 0;
800 u32 cbaddr = 0;
801 u16 cbport = 0;
802 u32 addrlen = addr_len;
803 char *addr = addr_val;
804 int i, shift;
805
806 /* ipaddress */
807 shift = 24;
808 for(i = 4; i > 0 ; i--) {
809 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
810 return 0;
811 }
812 cbaddr |= (temp << shift);
813 if (shift > 0)
814 shift -= 8;
815 }
816 *cbaddrp = cbaddr;
817
818 /* port */
819 shift = 8;
820 for(i = 2; i > 0 ; i--) {
821 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
822 return 0;
823 }
824 cbport |= (temp << shift);
825 if (shift > 0)
826 shift -= 8;
827 }
828 *cbportp = cbport;
829 return 1;
830}
831
fd39ca9a 832static void
1da177e4
LT		 833gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
834{
835 struct nfs4_callback *cb = &clp->cl_callback;
836
837 /* Currently, we only support tcp for the callback channel */
838 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
839 goto out_err;
840
841 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
842 &cb->cb_addr, &cb->cb_port)))
843 goto out_err;
844 cb->cb_prog = se->se_callback_prog;
845 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 846 return;
847out_err:
849823c5 848 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 849 "will not receive delegations\n",
850 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
851
1da177e4
LT		 852 return;
853}
854
0733d213
AA		 855/*
856 * Set the exchange_id flags returned by the server.
857 */
858static void
859nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
860{
861 /* pNFS is not supported */
862 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
863
864 /* Referrals are supported, Migration is not. */
865 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
866
867 /* set the wire flags to return to client. */
868 clid->flags = new->cl_exchange_flags;
869}
870
069b6ad4
AA		 871__be32
872nfsd4_exchange_id(struct svc_rqst *rqstp,
873 struct nfsd4_compound_state *cstate,
874 struct nfsd4_exchange_id *exid)
875{
0733d213
AA		 876 struct nfs4_client *unconf, *conf, *new;
877 int status;
878 unsigned int strhashval;
879 char dname[HEXDIR_LEN];
880 nfs4_verifier verf = exid->verifier;
881 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
882
883 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
884 " ip_addr=%u flags %x, spa_how %d\n",
885 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
886 ip_addr, exid->flags, exid->spa_how);
887
888 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
889 return nfserr_inval;
890
891 /* Currently only support SP4_NONE */
892 switch (exid->spa_how) {
893 case SP4_NONE:
894 break;
895 case SP4_SSV:
896 return nfserr_encr_alg_unsupp;
897 default:
898 BUG(); /* checked by xdr code */
899 case SP4_MACH_CRED:
900 return nfserr_serverfault; /* no excuse :-/ */
901 }
902
903 status = nfs4_make_rec_clidname(dname, &exid->clname);
904
905 if (status)
906 goto error;
907
908 strhashval = clientstr_hashval(dname);
909
910 nfs4_lock_state();
911 status = nfs_ok;
912
a1bcecd2 913 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 914 if (conf) {
915 if (!same_verf(&verf, &conf->cl_verifier)) {
916 /* 18.35.4 case 8 */
917 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
918 status = nfserr_not_same;
919 goto out;
920 }
921 /* Client reboot: destroy old state */
922 expire_client(conf);
923 goto out_new;
924 }
925 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
926 /* 18.35.4 case 9 */
927 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
928 status = nfserr_perm;
929 goto out;
930 }
931 expire_client(conf);
932 goto out_new;
933 }
934 if (ip_addr != conf->cl_addr &&
935 !(exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A)) {
936 /* Client collision. 18.35.4 case 3 */
937 status = nfserr_clid_inuse;
938 goto out;
939 }
940 /*
941 * Set bit when the owner id and verifier map to an already
942 * confirmed client id (18.35.3).
943 */
944 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
945
946 /*
947 * Falling into 18.35.4 case 2, possible router replay.
948 * Leave confirmed record intact and return same result.
949 */
950 copy_verf(conf, &verf);
951 new = conf;
952 goto out_copy;
953 } else {
954 /* 18.35.4 case 7 */
955 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
956 status = nfserr_noent;
957 goto out;
958 }
959 }
960
a1bcecd2 961 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 962 if (unconf) {
963 /*
964 * Possible retry or client restart. Per 18.35.4 case 4,
965 * a new unconfirmed record should be generated regardless
966 * of whether any properties have changed.
967 */
968 expire_client(unconf);
969 }
970
971out_new:
972 /* Normal case */
973 new = create_client(exid->clname, dname);
974 if (new == NULL) {
975 status = nfserr_resource;
976 goto out;
977 }
978
979 copy_verf(new, &verf);
980 copy_cred(&new->cl_cred, &rqstp->rq_cred);
981 new->cl_addr = ip_addr;
982 gen_clid(new);
983 gen_confirm(new);
984 add_to_unconfirmed(new, strhashval);
985out_copy:
986 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
987 exid->clientid.cl_id = new->cl_clientid.cl_id;
988
989 new->cl_seqid = exid->seqid = 1;
990 nfsd4_set_ex_flags(new, exid);
991
992 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
993 new->cl_seqid, new->cl_exchange_flags);
994 status = nfs_ok;
995
996out:
997 nfs4_unlock_state();
998error:
999 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1000 return status;
069b6ad4
AA		 1001}
1002
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{
f9bb94c4 1050 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1051 struct nfsd4_session *session;
1052 struct nfsd4_slot *slot;
1053 int status;
1054
f9bb94c4
AA		 1055 if (resp->opcnt != 1)
1056 return nfserr_sequence_pos;
1057
b85d4c01
BH		 1058 spin_lock(&sessionid_lock);
1059 status = nfserr_badsession;
1060 session = find_in_sessionid_hashtbl(&seq->sessionid);
1061 if (!session)
1062 goto out;
1063
1064 status = nfserr_badslot;
1065 if (seq->slotid >= session->se_fnumslots)
1066 goto out;
1067
1068 slot = &session->se_slots[seq->slotid];
1069 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1070
1071 status = check_slot_seqid(seq->seqid, slot);
1072 if (status == nfserr_replay_cache) {
1073 cstate->slot = slot;
1074 cstate->session = session;
1075 goto replay_cache;
1076 }
1077 if (status)
1078 goto out;
1079
1080 /* Success! bump slot seqid */
1081 slot->sl_inuse = true;
1082 slot->sl_seqid = seq->seqid;
1083
1084 cstate->slot = slot;
1085 cstate->session = session;
1086
1087replay_cache:
1088 /* Renew the clientid on success and on replay.
1089 * Hold a session reference until done processing the compound:
1090 * nfsd4_put_session called only if the cstate slot is set.
1091 */
1092 renew_client(session->se_client);
1093 nfsd4_get_session(session);
1094out:
1095 spin_unlock(&sessionid_lock);
1096 dprintk("%s: return %d\n", __func__, ntohl(status));
1097 return status;
069b6ad4
AA		 1098}
1099
b37ad28b 1100__be32
b591480b
BF		 1101nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1102 struct nfsd4_setclientid *setclid)
1da177e4 1103{
27459f09 1104 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1105 struct xdr_netobj clname = {
1106 .len = setclid->se_namelen,
1107 .data = setclid->se_name,
1108 };
1109 nfs4_verifier clverifier = setclid->se_verf;
1110 unsigned int strhashval;
28ce6054 1111 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1112 __be32 status;
68e76ad0 1113 char *princ;
a55370a3 1114 char dname[HEXDIR_LEN];
1da177e4 1115
1da177e4 1116 if (!check_name(clname))
73aea4ec 1117 return nfserr_inval;
1da177e4 1118
a55370a3
N		 1119 status = nfs4_make_rec_clidname(dname, &clname);
1120 if (status)
73aea4ec 1121 return status;
a55370a3 1122
1da177e4
LT		 1123 /*
1124 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1125 * We get here on a DRC miss.
1126 */
1127
a55370a3 1128 strhashval = clientstr_hashval(dname);
1da177e4 1129
1da177e4 1130 nfs4_lock_state();
a1bcecd2 1131 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1132 if (conf) {
a186e767 1133 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1134 status = nfserr_clid_inuse;
026722c2
BF		 1135 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1136 dprintk("NFSD: setclientid: string in use by client"
1137 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1138 goto out;
1139 }
1da177e4 1140 }
a186e767
BF		 1141 /*
1142 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1143 * has a description of SETCLIENTID request processing consisting
1144 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1145 */
a1bcecd2 1146 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1147 status = nfserr_resource;
1148 if (!conf) {
a186e767
BF		 1149 /*
1150 * RFC 3530 14.2.33 CASE 4:
1151 * placed first, because it is the normal case
1da177e4
LT		 1152 */
1153 if (unconf)
1154 expire_client(unconf);
a55370a3
N		 1155 new = create_client(clname, dname);
1156 if (new == NULL)
1da177e4 1157 goto out;
1da177e4 1158 gen_clid(new);
599e0a22 1159 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1160 /*
a186e767
BF		 1161 * RFC 3530 14.2.33 CASE 1:
1162 * probable callback update
1da177e4 1163 */
31f4a6c1
N		 1164 if (unconf) {
1165 /* Note this is removing unconfirmed {*x***},
1166 * which is stronger than RFC recommended {vxc**}.
1167 * This has the advantage that there is at most
1168 * one {*x***} in either list at any time.
1169 */
1170 expire_client(unconf);
1da177e4 1171 }
a55370a3
N		 1172 new = create_client(clname, dname);
1173 if (new == NULL)
1da177e4 1174 goto out;
1da177e4 1175 copy_clid(new, conf);
1da177e4
LT		 1176 } else if (!unconf) {
1177 /*
a186e767
BF		 1178 * RFC 3530 14.2.33 CASE 2:
1179 * probable client reboot; state will be removed if
1180 * confirmed.
1da177e4 1181 */
a55370a3
N		 1182 new = create_client(clname, dname);
1183 if (new == NULL)
1da177e4 1184 goto out;
1da177e4 1185 gen_clid(new);
49ba8781 1186 } else {
a186e767
BF		 1187 /*
1188 * RFC 3530 14.2.33 CASE 3:
1189 * probable client reboot; state will be removed if
1190 * confirmed.
1da177e4
LT		 1191 */
1192 expire_client(unconf);
a55370a3
N		 1193 new = create_client(clname, dname);
1194 if (new == NULL)
1da177e4 1195 goto out;
1da177e4 1196 gen_clid(new);
1da177e4 1197 }
c175b83c
BF		 1198 copy_verf(new, &clverifier);
1199 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1200 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1201 princ = svc_gss_principal(rqstp);
1202 if (princ) {
1203 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1204 if (new->cl_principal == NULL) {
1205 free_client(new);
1206 goto out;
1207 }
1208 }
c175b83c
BF		 1209 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1210 gen_confirm(new);
1211 gen_callback(new, setclid);
1212 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1213 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1214 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1215 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1216 status = nfs_ok;
1217out:
1218 nfs4_unlock_state();
1219 return status;
1220}
1221
1222
1223/*
a186e767
BF		 1224 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1225 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1226 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1227 */
b37ad28b 1228__be32
b591480b
BF		 1229nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1230 struct nfsd4_compound_state *cstate,
1231 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1232{
27459f09 1233 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1234 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1235 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1236 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1237 __be32 status;
1da177e4
LT		 1238
1239 if (STALE_CLIENTID(clid))
1240 return nfserr_stale_clientid;
1241 /*
1242 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1243 * We get here on a DRC miss.
1244 */
1245
1246 nfs4_lock_state();
21ab45a4
N		 1247
1248 conf = find_confirmed_client(clid);
1249 unconf = find_unconfirmed_client(clid);
1250
1251 status = nfserr_clid_inuse;
27459f09 1252 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1253 goto out;
27459f09 1254 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1255 goto out;
1256
a186e767
BF		 1257 /*
1258 * section 14.2.34 of RFC 3530 has a description of
1259 * SETCLIENTID_CONFIRM request processing consisting
1260 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1261 */
366e0c1d 1262 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1263 /*
1264 * RFC 3530 14.2.34 CASE 1:
1265 * callback update
1266 */
599e0a22 1267 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1268 status = nfserr_clid_inuse;
1269 else {
1a69c179
N		 1270 /* XXX: We just turn off callbacks until we can handle
1271 * change request correctly. */
cb36d634 1272 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 1273 gen_confirm(conf);
46309029 1274 nfsd4_remove_clid_dir(unconf);
1a69c179 1275 expire_client(unconf);
1da177e4 1276 status = nfs_ok;
1a69c179 1277
1da177e4 1278 }
f3aba4e5 1279 } else if (conf && !unconf) {
a186e767
BF		 1280 /*
1281 * RFC 3530 14.2.34 CASE 2:
1282 * probable retransmitted request; play it safe and
1283 * do nothing.
7c79f737 1284 */
599e0a22 1285 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1286 status = nfserr_clid_inuse;
21ab45a4 1287 else
1da177e4 1288 status = nfs_ok;
7c79f737 1289 } else if (!conf && unconf
599e0a22 1290 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1291 /*
1292 * RFC 3530 14.2.34 CASE 3:
1293 * Normal case; new or rebooted client:
7c79f737 1294 */
599e0a22 1295 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1296 status = nfserr_clid_inuse;
1297 } else {
1a69c179
N		 1298 unsigned int hash =
1299 clientstr_hashval(unconf->cl_recdir);
1300 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1301 hash, false);
1a69c179 1302 if (conf) {
c7b9a459 1303 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1304 expire_client(conf);
1305 }
1da177e4 1306 move_to_confirmed(unconf);
21ab45a4 1307 conf = unconf;
46f8a64b 1308 nfsd4_probe_callback(conf);
1a69c179 1309 status = nfs_ok;
1da177e4 1310 }
599e0a22
BF		 1311 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1312 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1313 &confirm)))) {
a186e767
BF		 1314 /*
1315 * RFC 3530 14.2.34 CASE 4:
1316 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1317 */
1da177e4 1318 status = nfserr_stale_clientid;
7c79f737 1319 } else {
08e8987c
N		 1320 /* check that we have hit one of the cases...*/
1321 status = nfserr_clid_inuse;
1322 }
1da177e4 1323out:
1da177e4
LT		 1324 nfs4_unlock_state();
1325 return status;
1326}
1327
1da177e4
LT		 1328/* OPEN Share state helper functions */
1329static inline struct nfs4_file *
1330alloc_init_file(struct inode *ino)
1331{
1332 struct nfs4_file *fp;
1333 unsigned int hashval = file_hashval(ino);
1334
e60d4398
N		 1335 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1336 if (fp) {
8b671b80 1337 atomic_set(&fp->fi_ref, 1);
1da177e4 1338 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1339 INIT_LIST_HEAD(&fp->fi_stateids);
1340 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1341 spin_lock(&recall_lock);
1da177e4 1342 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1343 spin_unlock(&recall_lock);
1da177e4
LT		 1344 fp->fi_inode = igrab(ino);
1345 fp->fi_id = current_fileid++;
47f9940c 1346 fp->fi_had_conflict = false;
1da177e4
LT		 1347 return fp;
1348 }
1349 return NULL;
1350}
1351
e60d4398 1352static void
e18b890b 1353nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1354{
e60d4398
N		 1355 if (*slab == NULL)
1356 return;
1a1d92c1 1357 kmem_cache_destroy(*slab);
e60d4398 1358 *slab = NULL;
1da177e4
LT		 1359}
1360
e8ff2a84 1361void
1da177e4
LT		 1362nfsd4_free_slabs(void)
1363{
e60d4398
N		 1364 nfsd4_free_slab(&stateowner_slab);
1365 nfsd4_free_slab(&file_slab);
5ac049ac 1366 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1367 nfsd4_free_slab(&deleg_slab);
e60d4398 1368}
1da177e4 1369
e60d4398
N		 1370static int
1371nfsd4_init_slabs(void)
1372{
1373 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1374 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1375 if (stateowner_slab == NULL)
1376 goto out_nomem;
1377 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1378 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1379 if (file_slab == NULL)
1380 goto out_nomem;
5ac049ac 1381 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1382 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1383 if (stateid_slab == NULL)
1384 goto out_nomem;
5b2d21c1 1385 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1386 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1387 if (deleg_slab == NULL)
1388 goto out_nomem;
e60d4398
N		 1389 return 0;
1390out_nomem:
1391 nfsd4_free_slabs();
1392 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1393 return -ENOMEM;
1da177e4
LT		 1394}
1395
1396void
1397nfs4_free_stateowner(struct kref *kref)
1398{
1399 struct nfs4_stateowner *sop =
1400 container_of(kref, struct nfs4_stateowner, so_ref);
1401 kfree(sop->so_owner.data);
1402 kmem_cache_free(stateowner_slab, sop);
1403}
1404
1405static inline struct nfs4_stateowner *
1406alloc_stateowner(struct xdr_netobj *owner)
1407{
1408 struct nfs4_stateowner *sop;
1409
1410 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1411 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1412 memcpy(sop->so_owner.data, owner->data, owner->len);
1413 sop->so_owner.len = owner->len;
1414 kref_init(&sop->so_ref);
1415 return sop;
1416 }
1417 kmem_cache_free(stateowner_slab, sop);
1418 }
1419 return NULL;
1420}
1421
1422static struct nfs4_stateowner *
1423alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1424 struct nfs4_stateowner *sop;
1425 struct nfs4_replay *rp;
1426 unsigned int idhashval;
1427
1428 if (!(sop = alloc_stateowner(&open->op_owner)))
1429 return NULL;
1430 idhashval = ownerid_hashval(current_ownerid);
1431 INIT_LIST_HEAD(&sop->so_idhash);
1432 INIT_LIST_HEAD(&sop->so_strhash);
1433 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1434 INIT_LIST_HEAD(&sop->so_stateids);
1435 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1436 INIT_LIST_HEAD(&sop->so_close_lru);
1437 sop->so_time = 0;
1438 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1439 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1440 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1441 sop->so_is_open_owner = 1;
1442 sop->so_id = current_ownerid++;
1443 sop->so_client = clp;
1444 sop->so_seqid = open->op_seqid;
1445 sop->so_confirmed = 0;
1446 rp = &sop->so_replay;
de1ae286 1447 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1448 rp->rp_buflen = 0;
1449 rp->rp_buf = rp->rp_ibuf;
1450 return sop;
1451}
1452
1da177e4
LT		 1453static inline void
1454init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1455 struct nfs4_stateowner *sop = open->op_stateowner;
1456 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1457
1458 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1459 INIT_LIST_HEAD(&stp->st_perstateowner);
1460 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1461 INIT_LIST_HEAD(&stp->st_perfile);
1462 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1463 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1464 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1465 stp->st_stateowner = sop;
13cd2184 1466 get_nfs4_file(fp);
1da177e4
LT		 1467 stp->st_file = fp;
1468 stp->st_stateid.si_boot = boot_time;
1469 stp->st_stateid.si_stateownerid = sop->so_id;
1470 stp->st_stateid.si_fileid = fp->fi_id;
1471 stp->st_stateid.si_generation = 0;
1472 stp->st_access_bmap = 0;
1473 stp->st_deny_bmap = 0;
1474 __set_bit(open->op_share_access, &stp->st_access_bmap);
1475 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1476 stp->st_openstp = NULL;
1da177e4
LT		 1477}
1478
fd39ca9a 1479static void
1da177e4
LT		 1480move_to_close_lru(struct nfs4_stateowner *sop)
1481{
1482 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1483
358dd55a 1484 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1485 sop->so_time = get_seconds();
1486}
1487
1da177e4 1488static int
599e0a22
BF		 1489same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1490 clientid_t *clid)
1491{
1492 return (sop->so_owner.len == owner->len) &&
1493 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1494 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1495}
1496
1497static struct nfs4_stateowner *
1498find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1499{
1500 struct nfs4_stateowner *so = NULL;
1501
1502 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1503 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1504 return so;
1505 }
1506 return NULL;
1507}
1508
1509/* search file_hashtbl[] for file */
1510static struct nfs4_file *
1511find_file(struct inode *ino)
1512{
1513 unsigned int hashval = file_hashval(ino);
1514 struct nfs4_file *fp;
1515
8b671b80 1516 spin_lock(&recall_lock);
1da177e4 1517 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1518 if (fp->fi_inode == ino) {
1519 get_nfs4_file(fp);
8b671b80 1520 spin_unlock(&recall_lock);
1da177e4 1521 return fp;
13cd2184 1522 }
1da177e4 1523 }
8b671b80 1524 spin_unlock(&recall_lock);
1da177e4
LT		 1525 return NULL;
1526}
1527
8838dc43 1528static inline int access_valid(u32 x)
ba5a6a19 1529{
8838dc43
BF		 1530 if (x < NFS4_SHARE_ACCESS_READ)
1531 return 0;
1532 if (x > NFS4_SHARE_ACCESS_BOTH)
1533 return 0;
1534 return 1;
ba5a6a19
BF		 1535}
1536
8838dc43 1537static inline int deny_valid(u32 x)
ba5a6a19 1538{
8838dc43
BF		 1539 /* Note: unlike access bits, deny bits may be zero. */
1540 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1541}
1da177e4 1542
4f83aa30
BF		 1543/*
1544 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1545 * st_{access,deny}_bmap field of the stateid, in order to track not
1546 * only what share bits are currently in force, but also what
1547 * combinations of share bits previous opens have used. This allows us
1548 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1549 * return an error if the client attempt to downgrade to a combination
1550 * of share bits not explicable by closing some of its previous opens.
1551 *
1552 * XXX: This enforcement is actually incomplete, since we don't keep
1553 * track of access/deny bit combinations; so, e.g., we allow:
1554 *
1555 * OPEN allow read, deny write
1556 * OPEN allow both, deny none
1557 * DOWNGRADE allow read, deny none
1558 *
1559 * which we should reject.
1560 */
fd39ca9a 1561static void
1da177e4
LT		 1562set_access(unsigned int *access, unsigned long bmap) {
1563 int i;
1564
1565 *access = 0;
1566 for (i = 1; i < 4; i++) {
1567 if (test_bit(i, &bmap))
1568 *access |= i;
1569 }
1570}
1571
fd39ca9a 1572static void
1da177e4
LT		 1573set_deny(unsigned int *deny, unsigned long bmap) {
1574 int i;
1575
1576 *deny = 0;
1577 for (i = 0; i < 4; i++) {
1578 if (test_bit(i, &bmap))
1579 *deny |= i ;
1580 }
1581}
1582
1583static int
1584test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1585 unsigned int access, deny;
1586
1587 set_access(&access, stp->st_access_bmap);
1588 set_deny(&deny, stp->st_deny_bmap);
1589 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1590 return 0;
1591 return 1;
1592}
1593
1594/*
1595 * Called to check deny when READ with all zero stateid or
1596 * WRITE with all zero or all one stateid
1597 */
b37ad28b 1598static __be32
1da177e4
LT		 1599nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1600{
1601 struct inode *ino = current_fh->fh_dentry->d_inode;
1602 struct nfs4_file *fp;
1603 struct nfs4_stateid *stp;
b37ad28b 1604 __be32 ret;
1da177e4
LT		 1605
1606 dprintk("NFSD: nfs4_share_conflict\n");
1607
1608 fp = find_file(ino);
13cd2184
N		 1609 if (!fp)
1610 return nfs_ok;
b700949b 1611 ret = nfserr_locked;
1da177e4 1612 /* Search for conflicting share reservations */
13cd2184
N		 1613 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1614 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1615 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1616 goto out;
1da177e4 1617 }
13cd2184
N		 1618 ret = nfs_ok;
1619out:
1620 put_nfs4_file(fp);
1621 return ret;
1da177e4
LT		 1622}
1623
1624static inline void
1625nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1626{
1627 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1628 drop_file_write_access(filp);
1da177e4
LT		 1629 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1630 }
1631}
1632
1633/*
1634 * Recall a delegation
1635 */
1636static int
1637do_recall(void *__dp)
1638{
1639 struct nfs4_delegation *dp = __dp;
1640
47f9940c 1641 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1642 nfsd4_cb_recall(dp);
1643 return 0;
1644}
1645
1646/*
1647 * Spawn a thread to perform a recall on the delegation represented
1648 * by the lease (file_lock)
1649 *
1650 * Called from break_lease() with lock_kernel() held.
1651 * Note: we assume break_lease will only call this *once* for any given
1652 * lease.
1653 */
1654static
1655void nfsd_break_deleg_cb(struct file_lock *fl)
1656{
1657 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1658 struct task_struct *t;
1659
1660 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1661 if (!dp)
1662 return;
1663
1664 /* We're assuming the state code never drops its reference
1665 * without first removing the lease. Since we're in this lease
1666 * callback (and since the lease code is serialized by the kernel
1667 * lock) we know the server hasn't removed the lease yet, we know
1668 * it's safe to take a reference: */
1669 atomic_inc(&dp->dl_count);
cfdcad4d 1670 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1671
1672 spin_lock(&recall_lock);
1673 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1674 spin_unlock(&recall_lock);
1675
1676 /* only place dl_time is set. protected by lock_kernel*/
1677 dp->dl_time = get_seconds();
1678
0272e1fd
BF		 1679 /*
1680 * We don't want the locks code to timeout the lease for us;
1681 * we'll remove it ourself if the delegation isn't returned
1682 * in time.
1683 */
1684 fl->fl_break_time = 0;
1da177e4
LT		 1685
1686 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1687 if (IS_ERR(t)) {
1688 struct nfs4_client *clp = dp->dl_client;
1689
1690 printk(KERN_INFO "NFSD: Callback thread failed for "
1691 "for client (clientid %08x/%08x)\n",
1692 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1693 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1694 nfs4_put_delegation(dp);
1695 }
1696}
1697
1698/*
1699 * The file_lock is being reapd.
1700 *
1701 * Called by locks_free_lock() with lock_kernel() held.
1702 */
1703static
1704void nfsd_release_deleg_cb(struct file_lock *fl)
1705{
1706 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1707
1708 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1709
1710 if (!(fl->fl_flags & FL_LEASE) || !dp)
1711 return;
1712 dp->dl_flock = NULL;
1713}
1714
1715/*
1716 * Set the delegation file_lock back pointer.
1717 *
a9933cea 1718 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1719 */
1720static
1721void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1722{
1723 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1724
1725 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1726 if (!dp)
1727 return;
1728 dp->dl_flock = new;
1729}
1730
1731/*
a9933cea 1732 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1733 */
1734static
1735int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1736{
1737 struct nfs4_delegation *onlistd =
1738 (struct nfs4_delegation *)onlist->fl_owner;
1739 struct nfs4_delegation *tryd =
1740 (struct nfs4_delegation *)try->fl_owner;
1741
1742 if (onlist->fl_lmops != try->fl_lmops)
1743 return 0;
1744
1745 return onlistd->dl_client == tryd->dl_client;
1746}
1747
1748
1749static
1750int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1751{
1752 if (arg & F_UNLCK)
1753 return lease_modify(onlist, arg);
1754 else
1755 return -EAGAIN;
1756}
1757
fd39ca9a 1758static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1759 .fl_break = nfsd_break_deleg_cb,
1760 .fl_release_private = nfsd_release_deleg_cb,
1761 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1762 .fl_mylease = nfsd_same_client_deleg_cb,
1763 .fl_change = nfsd_change_deleg_cb,
1764};
1765
1766
b37ad28b 1767__be32
1da177e4
LT		 1768nfsd4_process_open1(struct nfsd4_open *open)
1769{
1da177e4
LT		 1770 clientid_t *clientid = &open->op_clientid;
1771 struct nfs4_client *clp = NULL;
1772 unsigned int strhashval;
1773 struct nfs4_stateowner *sop = NULL;
1774
1da177e4 1775 if (!check_name(open->op_owner))
0f442aa2 1776 return nfserr_inval;
1da177e4
LT		 1777
1778 if (STALE_CLIENTID(&open->op_clientid))
1779 return nfserr_stale_clientid;
1780
1781 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1782 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1783 open->op_stateowner = sop;
1784 if (!sop) {
1785 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1786 clp = find_confirmed_client(clientid);
1787 if (clp == NULL)
0f442aa2
BF		 1788 return nfserr_expired;
1789 goto renew;
1da177e4 1790 }
0f442aa2
BF		 1791 if (!sop->so_confirmed) {
1792 /* Replace unconfirmed owners without checking for replay. */
1793 clp = sop->so_client;
f044ff83 1794 release_openowner(sop);
0f442aa2
BF		 1795 open->op_stateowner = NULL;
1796 goto renew;
1797 }
1798 if (open->op_seqid == sop->so_seqid - 1) {
1799 if (sop->so_replay.rp_buflen)
a90b061c 1800 return nfserr_replay_me;
0f442aa2
BF		 1801 /* The original OPEN failed so spectacularly
1802 * that we don't even have replay data saved!
1803 * Therefore, we have no choice but to continue
1804 * processing this OPEN; presumably, we'll
1805 * fail again for the same reason.
1806 */
1807 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1808 goto renew;
1809 }
1810 if (open->op_seqid != sop->so_seqid)
1811 return nfserr_bad_seqid;
1da177e4 1812renew:
0f442aa2
BF		 1813 if (open->op_stateowner == NULL) {
1814 sop = alloc_init_open_stateowner(strhashval, clp, open);
1815 if (sop == NULL)
1816 return nfserr_resource;
1817 open->op_stateowner = sop;
1818 }
1819 list_del_init(&sop->so_close_lru);
1da177e4 1820 renew_client(sop->so_client);
0f442aa2 1821 return nfs_ok;
1da177e4
LT		 1822}
1823
b37ad28b 1824static inline __be32
4a6e43e6
N		 1825nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1826{
1827 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1828 return nfserr_openmode;
1829 else
1830 return nfs_ok;
1831}
1832
52f4fb43
N		 1833static struct nfs4_delegation *
1834find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1835{
1836 struct nfs4_delegation *dp;
1837
ea1da636 1838 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1839 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1840 return dp;
1841 }
1842 return NULL;
1843}
1844
b37ad28b 1845static __be32
567d9829
N		 1846nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1847 struct nfs4_delegation **dp)
1848{
1849 int flags;
b37ad28b 1850 __be32 status = nfserr_bad_stateid;
567d9829
N		 1851
1852 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1853 if (*dp == NULL)
c44c5eeb 1854 goto out;
567d9829
N		 1855 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1856 RD_STATE : WR_STATE;
1857 status = nfs4_check_delegmode(*dp, flags);
1858 if (status)
1859 *dp = NULL;
c44c5eeb
N		 1860out:
1861 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1862 return nfs_ok;
1863 if (status)
1864 return status;
1865 open->op_stateowner->so_confirmed = 1;
1866 return nfs_ok;
567d9829
N		 1867}
1868
b37ad28b 1869static __be32
1da177e4
LT		 1870nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1871{
1872 struct nfs4_stateid *local;
b37ad28b 1873 __be32 status = nfserr_share_denied;
1da177e4
LT		 1874 struct nfs4_stateowner *sop = open->op_stateowner;
1875
8beefa24 1876 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1877 /* ignore lock owners */
1878 if (local->st_stateowner->so_is_open_owner == 0)
1879 continue;
1880 /* remember if we have seen this open owner */
1881 if (local->st_stateowner == sop)
1882 *stpp = local;
1883 /* check for conflicting share reservations */
1884 if (!test_share(local, open))
1885 goto out;
1886 }
1887 status = 0;
1888out:
1889 return status;
1890}
1891
5ac049ac
N		 1892static inline struct nfs4_stateid *
1893nfs4_alloc_stateid(void)
1894{
1895 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1896}
1897
b37ad28b 1898static __be32
1da177e4 1899nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1900 struct nfs4_delegation *dp,
1da177e4
LT		 1901 struct svc_fh *cur_fh, int flags)
1902{
1903 struct nfs4_stateid *stp;
1da177e4 1904
5ac049ac 1905 stp = nfs4_alloc_stateid();
1da177e4
LT		 1906 if (stp == NULL)
1907 return nfserr_resource;
1908
567d9829
N		 1909 if (dp) {
1910 get_file(dp->dl_vfs_file);
1911 stp->st_vfs_file = dp->dl_vfs_file;
1912 } else {
b37ad28b 1913 __be32 status;
567d9829
N		 1914 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1915 &stp->st_vfs_file);
1916 if (status) {
1917 if (status == nfserr_dropit)
1918 status = nfserr_jukebox;
5ac049ac 1919 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1920 return status;
1921 }
1da177e4 1922 }
1da177e4
LT		 1923 *stpp = stp;
1924 return 0;
1925}
1926
b37ad28b 1927static inline __be32
1da177e4
LT		 1928nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1929 struct nfsd4_open *open)
1930{
1931 struct iattr iattr = {
1932 .ia_valid = ATTR_SIZE,
1933 .ia_size = 0,
1934 };
1935 if (!open->op_truncate)
1936 return 0;
1937 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1938 return nfserr_inval;
1da177e4
LT		 1939 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1940}
1941
b37ad28b 1942static __be32
1da177e4
LT		 1943nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1944{
1945 struct file *filp = stp->st_vfs_file;
7eaa36e2 1946 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1947 unsigned int share_access, new_writer;
b37ad28b 1948 __be32 status;
1da177e4
LT		 1949
1950 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1951 new_writer = (~share_access) & open->op_share_access
1952 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1953
6c26d08f 1954 if (new_writer) {
b37ad28b
AV		 1955 int err = get_write_access(inode);
1956 if (err)
1957 return nfserrno(err);
e518f056
BH		 1958 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1959 if (err)
1960 return nfserrno(err);
1961 file_take_write(filp);
6c26d08f 1962 }
1da177e4
LT		 1963 status = nfsd4_truncate(rqstp, cur_fh, open);
1964 if (status) {
6c26d08f
BF		 1965 if (new_writer)
1966 put_write_access(inode);
1da177e4
LT		 1967 return status;
1968 }
1969 /* remember the open */
6c26d08f 1970 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1971 __set_bit(open->op_share_access, &stp->st_access_bmap);
1972 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1973
1974 return nfs_ok;
1975}
1976
1977
1da177e4 1978static void
37515177 1979nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1980{
37515177
N		 1981 open->op_stateowner->so_confirmed = 1;
1982 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1983}
1984
1985/*
1986 * Attempt to hand out a delegation.
1987 */
1988static void
1989nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1990{
1991 struct nfs4_delegation *dp;
1992 struct nfs4_stateowner *sop = stp->st_stateowner;
1993 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1994 struct file_lock fl, *flp = &fl;
1995 int status, flag = 0;
1996
1997 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1998 open->op_recall = 0;
1999 switch (open->op_claim_type) {
2000 case NFS4_OPEN_CLAIM_PREVIOUS:
2001 if (!atomic_read(&cb->cb_set))
2002 open->op_recall = 1;
2003 flag = open->op_delegate_type;
2004 if (flag == NFS4_OPEN_DELEGATE_NONE)
2005 goto out;
2006 break;
2007 case NFS4_OPEN_CLAIM_NULL:
2008 /* Let's not give out any delegations till everyone's
2009 * had the chance to reclaim theirs.... */
af558e33 2010 if (locks_in_grace())
7b190fec
N		 2011 goto out;
2012 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2013 goto out;
2014 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2015 flag = NFS4_OPEN_DELEGATE_WRITE;
2016 else
2017 flag = NFS4_OPEN_DELEGATE_READ;
2018 break;
2019 default:
2020 goto out;
2021 }
1da177e4
LT		 2022
2023 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2024 if (dp == NULL) {
2025 flag = NFS4_OPEN_DELEGATE_NONE;
2026 goto out;
2027 }
2028 locks_init_lock(&fl);
2029 fl.fl_lmops = &nfsd_lease_mng_ops;
2030 fl.fl_flags = FL_LEASE;
9167f501 2031 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2032 fl.fl_end = OFFSET_MAX;
2033 fl.fl_owner = (fl_owner_t)dp;
2034 fl.fl_file = stp->st_vfs_file;
2035 fl.fl_pid = current->tgid;
2036
a9933cea 2037 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2038 * the lock_manager callbacks fl_mylease and fl_change are used
2039 */
9167f501 2040 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2041 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2042 unhash_delegation(dp);
1da177e4
LT		 2043 flag = NFS4_OPEN_DELEGATE_NONE;
2044 goto out;
2045 }
2046
2047 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2048
2049 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2050 dp->dl_stateid.si_boot,
2051 dp->dl_stateid.si_stateownerid,
2052 dp->dl_stateid.si_fileid,
2053 dp->dl_stateid.si_generation);
2054out:
7b190fec
N		 2055 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2056 && flag == NFS4_OPEN_DELEGATE_NONE
2057 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2058 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2059 open->op_delegate_type = flag;
2060}
2061
2062/*
2063 * called with nfs4_lock_state() held.
2064 */
b37ad28b 2065__be32
1da177e4
LT		 2066nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2067{
2068 struct nfs4_file *fp = NULL;
2069 struct inode *ino = current_fh->fh_dentry->d_inode;
2070 struct nfs4_stateid *stp = NULL;
567d9829 2071 struct nfs4_delegation *dp = NULL;
b37ad28b 2072 __be32 status;
1da177e4
LT		 2073
2074 status = nfserr_inval;
ba5a6a19
BF		 2075 if (!access_valid(open->op_share_access)
2076 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2077 goto out;
2078 /*
2079 * Lookup file; if found, lookup stateid and check open request,
2080 * and check for delegations in the process of being recalled.
2081 * If not found, create the nfs4_file struct
2082 */
2083 fp = find_file(ino);
2084 if (fp) {
2085 if ((status = nfs4_check_open(fp, open, &stp)))
2086 goto out;
c44c5eeb
N		 2087 status = nfs4_check_deleg(fp, open, &dp);
2088 if (status)
2089 goto out;
1da177e4 2090 } else {
c44c5eeb
N		 2091 status = nfserr_bad_stateid;
2092 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2093 goto out;
1da177e4
LT		 2094 status = nfserr_resource;
2095 fp = alloc_init_file(ino);
2096 if (fp == NULL)
2097 goto out;
2098 }
2099
2100 /*
2101 * OPEN the file, or upgrade an existing OPEN.
2102 * If truncate fails, the OPEN fails.
2103 */
2104 if (stp) {
2105 /* Stateid was found, this is an OPEN upgrade */
2106 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2107 if (status)
2108 goto out;
444c2c07 2109 update_stateid(&stp->st_stateid);
1da177e4
LT		 2110 } else {
2111 /* Stateid was not found, this is a new OPEN */
2112 int flags = 0;
9ecb6a08 2113 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2114 flags |= NFSD_MAY_READ;
1da177e4 2115 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2116 flags |= NFSD_MAY_WRITE;
567d9829
N		 2117 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2118 if (status)
1da177e4
LT		 2119 goto out;
2120 init_stateid(stp, fp, open);
2121 status = nfsd4_truncate(rqstp, current_fh, open);
2122 if (status) {
2283963f 2123 release_open_stateid(stp);
1da177e4
LT		 2124 goto out;
2125 }
2126 }
2127 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2128
2129 /*
2130 * Attempt to hand out a delegation. No error return, because the
2131 * OPEN succeeds even if we fail.
2132 */
2133 nfs4_open_delegation(current_fh, open, stp);
2134
2135 status = nfs_ok;
2136
2137 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2138 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2139 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2140out:
13cd2184
N		 2141 if (fp)
2142 put_nfs4_file(fp);
37515177
N		 2143 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2144 nfs4_set_claim_prev(open);
1da177e4
LT		 2145 /*
2146 * To finish the open response, we just need to set the rflags.
2147 */
2148 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2149 if (!open->op_stateowner->so_confirmed)
2150 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2151
2152 return status;
2153}
2154
b37ad28b 2155__be32
b591480b
BF		 2156nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2157 clientid_t *clid)
1da177e4
LT		 2158{
2159 struct nfs4_client *clp;
b37ad28b 2160 __be32 status;
1da177e4
LT		 2161
2162 nfs4_lock_state();
2163 dprintk("process_renew(%08x/%08x): starting\n",
2164 clid->cl_boot, clid->cl_id);
2165 status = nfserr_stale_clientid;
2166 if (STALE_CLIENTID(clid))
2167 goto out;
2168 clp = find_confirmed_client(clid);
2169 status = nfserr_expired;
2170 if (clp == NULL) {
2171 /* We assume the client took too long to RENEW. */
2172 dprintk("nfsd4_renew: clientid not found!\n");
2173 goto out;
2174 }
2175 renew_client(clp);
2176 status = nfserr_cb_path_down;
ea1da636 2177 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 2178 && !atomic_read(&clp->cl_callback.cb_set))
2179 goto out;
2180 status = nfs_ok;
2181out:
2182 nfs4_unlock_state();
2183 return status;
2184}
2185
af558e33
BF		 2186struct lock_manager nfsd4_manager = {
2187};
2188
a76b4319 2189static void
af558e33 2190nfsd4_end_grace(void)
a76b4319
N		 2191{
2192 dprintk("NFSD: end of grace period\n");
c7b9a459 2193 nfsd4_recdir_purge_old();
af558e33 2194 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2195}
2196
fd39ca9a 2197static time_t
1da177e4
LT		 2198nfs4_laundromat(void)
2199{
2200 struct nfs4_client *clp;
2201 struct nfs4_stateowner *sop;
2202 struct nfs4_delegation *dp;
2203 struct list_head *pos, *next, reaplist;
2204 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2205 time_t t, clientid_val = NFSD_LEASE_TIME;
2206 time_t u, test_val = NFSD_LEASE_TIME;
2207
2208 nfs4_lock_state();
2209
2210 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2211 if (locks_in_grace())
2212 nfsd4_end_grace();
1da177e4
LT		 2213 list_for_each_safe(pos, next, &client_lru) {
2214 clp = list_entry(pos, struct nfs4_client, cl_lru);
2215 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2216 t = clp->cl_time - cutoff;
2217 if (clientid_val > t)
2218 clientid_val = t;
2219 break;
2220 }
2221 dprintk("NFSD: purging unused client (clientid %08x)\n",
2222 clp->cl_clientid.cl_id);
c7b9a459 2223 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2224 expire_client(clp);
2225 }
2226 INIT_LIST_HEAD(&reaplist);
2227 spin_lock(&recall_lock);
2228 list_for_each_safe(pos, next, &del_recall_lru) {
2229 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2230 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2231 u = dp->dl_time - cutoff;
2232 if (test_val > u)
2233 test_val = u;
2234 break;
2235 }
2236 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2237 dp, dp->dl_flock);
2238 list_move(&dp->dl_recall_lru, &reaplist);
2239 }
2240 spin_unlock(&recall_lock);
2241 list_for_each_safe(pos, next, &reaplist) {
2242 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2243 list_del_init(&dp->dl_recall_lru);
2244 unhash_delegation(dp);
2245 }
2246 test_val = NFSD_LEASE_TIME;
2247 list_for_each_safe(pos, next, &close_lru) {
2248 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2249 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2250 u = sop->so_time - cutoff;
2251 if (test_val > u)
2252 test_val = u;
2253 break;
2254 }
2255 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2256 sop->so_id);
f044ff83 2257 release_openowner(sop);
1da177e4
LT		 2258 }
2259 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2260 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2261 nfs4_unlock_state();
2262 return clientid_val;
2263}
2264
a254b246
HH		 2265static struct workqueue_struct *laundry_wq;
2266static void laundromat_main(struct work_struct *);
2267static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2268
2269static void
c4028958 2270laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2271{
2272 time_t t;
2273
2274 t = nfs4_laundromat();
2275 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2276 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2277}
2278
fd39ca9a 2279static struct nfs4_stateowner *
f8816512
N		 2280search_close_lru(u32 st_id, int flags)
2281{
1da177e4
LT		 2282 struct nfs4_stateowner *local = NULL;
2283
1da177e4
LT		 2284 if (flags & CLOSE_STATE) {
2285 list_for_each_entry(local, &close_lru, so_close_lru) {
2286 if (local->so_id == st_id)
2287 return local;
2288 }
2289 }
2290 return NULL;
2291}
2292
2293static inline int
2294nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2295{
7eaa36e2 2296 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2297}
2298
2299static int
2300STALE_STATEID(stateid_t *stateid)
2301{
2302 if (stateid->si_boot == boot_time)
2303 return 0;
849823c5 2304 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2305 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2306 stateid->si_generation);
2307 return 1;
2308}
2309
2310static inline int
2311access_permit_read(unsigned long access_bmap)
2312{
2313 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2314 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2315 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2316}
2317
2318static inline int
2319access_permit_write(unsigned long access_bmap)
2320{
2321 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2322 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2323}
2324
2325static
b37ad28b 2326__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2327{
b37ad28b 2328 __be32 status = nfserr_openmode;
1da177e4
LT		 2329
2330 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2331 goto out;
2332 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2333 goto out;
2334 status = nfs_ok;
2335out:
2336 return status;
2337}
2338
b37ad28b 2339static inline __be32
1da177e4
LT		 2340check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2341{
203a8c8e 2342 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2343 return nfs_ok;
af558e33 2344 else if (locks_in_grace()) {
1da177e4
LT		 2345 /* Answer in remaining cases depends on existance of
2346 * conflicting state; so we must wait out the grace period. */
2347 return nfserr_grace;
2348 } else if (flags & WR_STATE)
2349 return nfs4_share_conflict(current_fh,
2350 NFS4_SHARE_DENY_WRITE);
2351 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2352 return nfs4_share_conflict(current_fh,
2353 NFS4_SHARE_DENY_READ);
2354}
2355
2356/*
2357 * Allow READ/WRITE during grace period on recovered state only for files
2358 * that are not able to provide mandatory locking.
2359 */
2360static inline int
18f82731 2361grace_disallows_io(struct inode *inode)
1da177e4 2362{
203a8c8e 2363 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2364}
2365
0836f587
BF		 2366static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2367{
2368 /* If the client sends us a stateid from the future, it's buggy: */
2369 if (in->si_generation > ref->si_generation)
2370 return nfserr_bad_stateid;
2371 /*
2372 * The following, however, can happen. For example, if the
2373 * client sends an open and some IO at the same time, the open
2374 * may bump si_generation while the IO is still in flight.
2375 * Thanks to hard links and renames, the client never knows what
2376 * file an open will affect. So it could avoid that situation
2377 * only by serializing all opens and IO from the same open
2378 * owner. To recover from the old_stateid error, the client
2379 * will just have to retry the IO:
2380 */
2381 if (in->si_generation < ref->si_generation)
2382 return nfserr_old_stateid;
2383 return nfs_ok;
2384}
2385
3e633079
BF		 2386static int is_delegation_stateid(stateid_t *stateid)
2387{
2388 return stateid->si_fileid == 0;
2389}
2390
1da177e4
LT		 2391/*
2392* Checks for stateid operations
2393*/
b37ad28b 2394__be32
1da177e4
LT		 2395nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2396{
2397 struct nfs4_stateid *stp = NULL;
2398 struct nfs4_delegation *dp = NULL;
1da177e4 2399 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2400 __be32 status;
1da177e4 2401
1da177e4
LT		 2402 if (filpp)
2403 *filpp = NULL;
2404
18f82731 2405 if (grace_disallows_io(ino))
1da177e4
LT		 2406 return nfserr_grace;
2407
2408 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2409 return check_special_stateids(current_fh, stateid, flags);
2410
1da177e4
LT		 2411 status = nfserr_stale_stateid;
2412 if (STALE_STATEID(stateid))
2413 goto out;
2414
1da177e4 2415 status = nfserr_bad_stateid;
3e633079 2416 if (is_delegation_stateid(stateid)) {
a4455be0 2417 dp = find_delegation_stateid(ino, stateid);
819a8f53 2418 if (!dp)
1da177e4 2419 goto out;
fd03b099 2420 status = check_stateid_generation(stateid, &dp->dl_stateid);
0c2a498f
BF		 2421 if (status)
2422 goto out;
dc9bf700
BF		 2423 status = nfs4_check_delegmode(dp, flags);
2424 if (status)
2425 goto out;
2426 renew_client(dp->dl_client);
dc9bf700
BF		 2427 if (filpp)
2428 *filpp = dp->dl_vfs_file;
1da177e4 2429 } else { /* open or lock stateid */
a4455be0 2430 stp = find_stateid(stateid, flags);
819a8f53 2431 if (!stp)
1da177e4 2432 goto out;
6150ef0d 2433 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2434 goto out;
2435 if (!stp->st_stateowner->so_confirmed)
2436 goto out;
fd03b099 2437 status = check_stateid_generation(stateid, &stp->st_stateid);
0c2a498f
BF		 2438 if (status)
2439 goto out;
a4455be0
BF		 2440 status = nfs4_check_openmode(stp, flags);
2441 if (status)
1da177e4
LT		 2442 goto out;
2443 renew_client(stp->st_stateowner->so_client);
2444 if (filpp)
2445 *filpp = stp->st_vfs_file;
1da177e4
LT		 2446 }
2447 status = nfs_ok;
2448out:
2449 return status;
2450}
2451
4c4cd222
N		 2452static inline int
2453setlkflg (int type)
2454{
2455 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2456 RD_STATE : WR_STATE;
2457}
1da177e4
LT		 2458
2459/*
2460 * Checks for sequence id mutating operations.
2461 */
b37ad28b 2462static __be32
4c4cd222 2463nfs4_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 2464{
1da177e4
LT		 2465 struct nfs4_stateid *stp;
2466 struct nfs4_stateowner *sop;
0836f587 2467 __be32 status;
1da177e4
LT		 2468
2469 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2470 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2471 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2472 stateid->si_generation);
3a4f98bb 2473
1da177e4
LT		 2474 *stpp = NULL;
2475 *sopp = NULL;
2476
1da177e4 2477 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2478 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2479 return nfserr_bad_stateid;
1da177e4
LT		 2480 }
2481
1da177e4 2482 if (STALE_STATEID(stateid))
3a4f98bb 2483 return nfserr_stale_stateid;
1da177e4
LT		 2484 /*
2485 * We return BAD_STATEID if filehandle doesn't match stateid,
2486 * the confirmed flag is incorrecly set, or the generation
2487 * number is incorrect.
1da177e4 2488 */
f8816512
N		 2489 stp = find_stateid(stateid, flags);
2490 if (stp == NULL) {
2491 /*
2492 * Also, we should make sure this isn't just the result of
2493 * a replayed close:
2494 */
2495 sop = search_close_lru(stateid->si_stateownerid, flags);
2496 if (sop == NULL)
2497 return nfserr_bad_stateid;
2498 *sopp = sop;
2499 goto check_replay;
2500 }
1da177e4 2501
39325bd0
BF		 2502 *stpp = stp;
2503 *sopp = sop = stp->st_stateowner;
2504
4c4cd222 2505 if (lock) {
4c4cd222 2506 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2507 struct nfs4_client *clp = sop->so_client;
4c4cd222 2508 int lkflg = 0;
b37ad28b 2509 __be32 status;
4c4cd222
N		 2510
2511 lkflg = setlkflg(lock->lk_type);
2512
2513 if (lock->lk_is_new) {
599e0a22
BF		 2514 if (!sop->so_is_open_owner)
2515 return nfserr_bad_stateid;
2516 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2517 return nfserr_bad_stateid;
599e0a22
BF		 2518 /* stp is the open stateid */
2519 status = nfs4_check_openmode(stp, lkflg);
2520 if (status)
2521 return status;
2522 } else {
2523 /* stp is the lock stateid */
2524 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2525 if (status)
2526 return status;
4c4cd222 2527 }
1da177e4
LT		 2528 }
2529
f3362737 2530 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2531 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2532 return nfserr_bad_stateid;
1da177e4
LT		 2533 }
2534
1da177e4
LT		 2535 /*
2536 * We now validate the seqid and stateid generation numbers.
2537 * For the moment, we ignore the possibility of
2538 * generation number wraparound.
2539 */
bd9aac52 2540 if (seqid != sop->so_seqid)
1da177e4
LT		 2541 goto check_replay;
2542
3a4f98bb 2543 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2544 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2545 " unconfirmed stateowner!\n");
2546 return nfserr_bad_stateid;
1da177e4 2547 }
3a4f98bb 2548 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2549 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2550 " confirmed yet!\n");
2551 return nfserr_bad_stateid;
1da177e4 2552 }
0836f587
BF		 2553 status = check_stateid_generation(stateid, &stp->st_stateid);
2554 if (status)
2555 return status;
52fd004e 2556 renew_client(sop->so_client);
3a4f98bb 2557 return nfs_ok;
1da177e4 2558
1da177e4 2559check_replay:
bd9aac52 2560 if (seqid == sop->so_seqid - 1) {
849823c5 2561 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2562 /* indicate replay to calling function */
a90b061c 2563 return nfserr_replay_me;
1da177e4 2564 }
2fdada03 2565 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2566 sop->so_seqid, seqid);
2567 *sopp = NULL;
2568 return nfserr_bad_seqid;
1da177e4
LT		 2569}
2570
b37ad28b 2571__be32
ca364317 2572nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2573 struct nfsd4_open_confirm *oc)
1da177e4 2574{
b37ad28b 2575 __be32 status;
1da177e4
LT		 2576 struct nfs4_stateowner *sop;
2577 struct nfs4_stateid *stp;
2578
2579 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2580 (int)cstate->current_fh.fh_dentry->d_name.len,
2581 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2582
ca364317 2583 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2584 if (status)
2585 return status;
1da177e4
LT		 2586
2587 nfs4_lock_state();
2588
ca364317
BF		 2589 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2590 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2591 CONFIRM | OPEN_STATE,
1da177e4
LT		 2592 &oc->oc_stateowner, &stp, NULL)))
2593 goto out;
2594
2595 sop = oc->oc_stateowner;
2596 sop->so_confirmed = 1;
2597 update_stateid(&stp->st_stateid);
2598 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2599 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2600 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2601 stp->st_stateid.si_boot,
2602 stp->st_stateid.si_stateownerid,
2603 stp->st_stateid.si_fileid,
2604 stp->st_stateid.si_generation);
c7b9a459
N		 2605
2606 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2607out:
f2327d9a 2608 if (oc->oc_stateowner) {
1da177e4 2609 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2610 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2611 }
1da177e4
LT		 2612 nfs4_unlock_state();
2613 return status;
2614}
2615
2616
2617/*
2618 * unset all bits in union bitmap (bmap) that
2619 * do not exist in share (from successful OPEN_DOWNGRADE)
2620 */
2621static void
2622reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2623{
2624 int i;
2625 for (i = 1; i < 4; i++) {
2626 if ((i & access) != i)
2627 __clear_bit(i, bmap);
2628 }
2629}
2630
2631static void
2632reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2633{
2634 int i;
2635 for (i = 0; i < 4; i++) {
2636 if ((i & deny) != i)
2637 __clear_bit(i, bmap);
2638 }
2639}
2640
b37ad28b 2641__be32
ca364317
BF		 2642nfsd4_open_downgrade(struct svc_rqst *rqstp,
2643 struct nfsd4_compound_state *cstate,
a4f1706a 2644 struct nfsd4_open_downgrade *od)
1da177e4 2645{
b37ad28b 2646 __be32 status;
1da177e4
LT		 2647 struct nfs4_stateid *stp;
2648 unsigned int share_access;
2649
2650 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2651 (int)cstate->current_fh.fh_dentry->d_name.len,
2652 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2653
ba5a6a19
BF		 2654 if (!access_valid(od->od_share_access)
2655 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2656 return nfserr_inval;
2657
2658 nfs4_lock_state();
ca364317
BF		 2659 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2660 od->od_seqid,
1da177e4 2661 &od->od_stateid,
f3362737 2662 OPEN_STATE,
1da177e4
LT		 2663 &od->od_stateowner, &stp, NULL)))
2664 goto out;
2665
2666 status = nfserr_inval;
2667 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2668 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2669 stp->st_access_bmap, od->od_share_access);
2670 goto out;
2671 }
2672 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2673 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2674 stp->st_deny_bmap, od->od_share_deny);
2675 goto out;
2676 }
2677 set_access(&share_access, stp->st_access_bmap);
2678 nfs4_file_downgrade(stp->st_vfs_file,
2679 share_access & ~od->od_share_access);
2680
2681 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2682 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2683
2684 update_stateid(&stp->st_stateid);
2685 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2686 status = nfs_ok;
2687out:
f2327d9a 2688 if (od->od_stateowner) {
1da177e4 2689 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2690 cstate->replay_owner = od->od_stateowner;
f2327d9a 2691 }
1da177e4
LT		 2692 nfs4_unlock_state();
2693 return status;
2694}
2695
2696/*
2697 * nfs4_unlock_state() called after encode
2698 */
b37ad28b 2699__be32
ca364317 2700nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2701 struct nfsd4_close *close)
1da177e4 2702{
b37ad28b 2703 __be32 status;
1da177e4
LT		 2704 struct nfs4_stateid *stp;
2705
2706 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2707 (int)cstate->current_fh.fh_dentry->d_name.len,
2708 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2709
2710 nfs4_lock_state();
2711 /* check close_lru for replay */
ca364317
BF		 2712 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2713 close->cl_seqid,
1da177e4 2714 &close->cl_stateid,
f3362737 2715 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2716 &close->cl_stateowner, &stp, NULL)))
2717 goto out;
1da177e4
LT		 2718 status = nfs_ok;
2719 update_stateid(&stp->st_stateid);
2720 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2721
04ef5954 2722 /* release_stateid() calls nfsd_close() if needed */
2283963f 2723 release_open_stateid(stp);
04ef5954
BF		 2724
2725 /* place unused nfs4_stateowners on so_close_lru list to be
2726 * released by the laundromat service after the lease period
2727 * to enable us to handle CLOSE replay
2728 */
2729 if (list_empty(&close->cl_stateowner->so_stateids))
2730 move_to_close_lru(close->cl_stateowner);
1da177e4 2731out:
f2327d9a 2732 if (close->cl_stateowner) {
1da177e4 2733 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2734 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2735 }
1da177e4
LT		 2736 nfs4_unlock_state();
2737 return status;
2738}
2739
b37ad28b 2740__be32
ca364317
BF		 2741nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2742 struct nfsd4_delegreturn *dr)
1da177e4 2743{
203a8c8e
BF		 2744 struct nfs4_delegation *dp;
2745 stateid_t *stateid = &dr->dr_stateid;
2746 struct inode *inode;
b37ad28b 2747 __be32 status;
1da177e4 2748
ca364317 2749 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 2750 return status;
2751 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2752
2753 nfs4_lock_state();
203a8c8e
BF		 2754 status = nfserr_bad_stateid;
2755 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2756 goto out;
2757 status = nfserr_stale_stateid;
2758 if (STALE_STATEID(stateid))
2759 goto out;
7e0f7cf5 2760 status = nfserr_bad_stateid;
203a8c8e
BF		 2761 if (!is_delegation_stateid(stateid))
2762 goto out;
203a8c8e
BF		 2763 dp = find_delegation_stateid(inode, stateid);
2764 if (!dp)
2765 goto out;
2766 status = check_stateid_generation(stateid, &dp->dl_stateid);
2767 if (status)
2768 goto out;
2769 renew_client(dp->dl_client);
2770
2771 unhash_delegation(dp);
1da177e4 2772out:
203a8c8e
BF		 2773 nfs4_unlock_state();
2774
1da177e4
LT		 2775 return status;
2776}
2777
2778
2779/*
2780 * Lock owner state (byte-range locks)
2781 */
2782#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2783#define LOCK_HASH_BITS 8
2784#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2785#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2786
87df4de8
BH		 2787static inline u64
2788end_offset(u64 start, u64 len)
2789{
2790 u64 end;
2791
2792 end = start + len;
2793 return end >= start ? end: NFS4_MAX_UINT64;
2794}
2795
2796/* last octet in a range */
2797static inline u64
2798last_byte_offset(u64 start, u64 len)
2799{
2800 u64 end;
2801
2802 BUG_ON(!len);
2803 end = start + len;
2804 return end > start ? end - 1: NFS4_MAX_UINT64;
2805}
2806
1da177e4
LT		 2807#define lockownerid_hashval(id) \
2808 ((id) & LOCK_HASH_MASK)
2809
2810static inline unsigned int
2811lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2812 struct xdr_netobj *ownername)
2813{
2814 return (file_hashval(inode) + cl_id
2815 + opaque_hashval(ownername->data, ownername->len))
2816 & LOCK_HASH_MASK;
2817}
2818
2819static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2820static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2821static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2822
fd39ca9a 2823static struct nfs4_stateid *
1da177e4
LT		 2824find_stateid(stateid_t *stid, int flags)
2825{
9346eff0 2826 struct nfs4_stateid *local;
1da177e4
LT		 2827 u32 st_id = stid->si_stateownerid;
2828 u32 f_id = stid->si_fileid;
2829 unsigned int hashval;
2830
2831 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2832 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2833 hashval = stateid_hashval(st_id, f_id);
2834 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2835 if ((local->st_stateid.si_stateownerid == st_id) &&
2836 (local->st_stateid.si_fileid == f_id))
2837 return local;
2838 }
2839 }
9346eff0
KK		 2840
2841 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2842 hashval = stateid_hashval(st_id, f_id);
2843 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2844 if ((local->st_stateid.si_stateownerid == st_id) &&
2845 (local->st_stateid.si_fileid == f_id))
2846 return local;
2847 }
849823c5 2848 }
1da177e4
LT		 2849 return NULL;
2850}
2851
2852static struct nfs4_delegation *
2853find_delegation_stateid(struct inode *ino, stateid_t *stid)
2854{
13cd2184
N		 2855 struct nfs4_file *fp;
2856 struct nfs4_delegation *dl;
1da177e4
LT		 2857
2858 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2859 stid->si_boot, stid->si_stateownerid,
2860 stid->si_fileid, stid->si_generation);
2861
1da177e4 2862 fp = find_file(ino);
13cd2184
N		 2863 if (!fp)
2864 return NULL;
2865 dl = find_delegation_file(fp, stid);
2866 put_nfs4_file(fp);
2867 return dl;
1da177e4
LT		 2868}
2869
2870/*
2871 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2872 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2873 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2874 * locking, this prevents us from being completely protocol-compliant. The
2875 * real solution to this problem is to start using unsigned file offsets in
2876 * the VFS, but this is a very deep change!
2877 */
2878static inline void
2879nfs4_transform_lock_offset(struct file_lock *lock)
2880{
2881 if (lock->fl_start < 0)
2882 lock->fl_start = OFFSET_MAX;
2883 if (lock->fl_end < 0)
2884 lock->fl_end = OFFSET_MAX;
2885}
2886
d5b9026a
N		 2887/* Hack!: For now, we're defining this just so we can use a pointer to it
2888 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2889static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2890};
1da177e4
LT		 2891
2892static inline void
2893nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2894{
d5b9026a
N		 2895 struct nfs4_stateowner *sop;
2896 unsigned int hval;
1da177e4 2897
d5b9026a
N		 2898 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2899 sop = (struct nfs4_stateowner *) fl->fl_owner;
2900 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2901 kref_get(&sop->so_ref);
2902 deny->ld_sop = sop;
2903 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2904 } else {
2905 deny->ld_sop = NULL;
2906 deny->ld_clientid.cl_boot = 0;
2907 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2908 }
2909 deny->ld_start = fl->fl_start;
87df4de8
BH		 2910 deny->ld_length = NFS4_MAX_UINT64;
2911 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2912 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2913 deny->ld_type = NFS4_READ_LT;
2914 if (fl->fl_type != F_RDLCK)
2915 deny->ld_type = NFS4_WRITE_LT;
2916}
2917
1da177e4
LT		 2918static struct nfs4_stateowner *
2919find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2920 struct xdr_netobj *owner)
2921{
2922 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2923 struct nfs4_stateowner *op;
2924
2925 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2926 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2927 return op;
2928 }
2929 return NULL;
2930}
2931
2932/*
2933 * Alloc a lock owner structure.
2934 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2935 * occured.
2936 *
2937 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2938 */
2939
2940static struct nfs4_stateowner *
2941alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2942 struct nfs4_stateowner *sop;
2943 struct nfs4_replay *rp;
2944 unsigned int idhashval;
2945
2946 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2947 return NULL;
2948 idhashval = lockownerid_hashval(current_ownerid);
2949 INIT_LIST_HEAD(&sop->so_idhash);
2950 INIT_LIST_HEAD(&sop->so_strhash);
2951 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2952 INIT_LIST_HEAD(&sop->so_stateids);
2953 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2954 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2955 sop->so_time = 0;
2956 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2957 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2958 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2959 sop->so_is_open_owner = 0;
2960 sop->so_id = current_ownerid++;
2961 sop->so_client = clp;
b59e3c0e
NB		 2962 /* It is the openowner seqid that will be incremented in encode in the
2963 * case of new lockowners; so increment the lock seqid manually: */
2964 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2965 sop->so_confirmed = 1;
2966 rp = &sop->so_replay;
de1ae286 2967 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2968 rp->rp_buflen = 0;
2969 rp->rp_buf = rp->rp_ibuf;
2970 return sop;
2971}
2972
fd39ca9a 2973static struct nfs4_stateid *
1da177e4
LT		 2974alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2975{
2976 struct nfs4_stateid *stp;
2977 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2978
5ac049ac
N		 2979 stp = nfs4_alloc_stateid();
2980 if (stp == NULL)
1da177e4
LT		 2981 goto out;
2982 INIT_LIST_HEAD(&stp->st_hash);
2983 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2984 INIT_LIST_HEAD(&stp->st_perstateowner);
2985 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2986 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2987 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2988 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2989 stp->st_stateowner = sop;
13cd2184 2990 get_nfs4_file(fp);
1da177e4
LT		 2991 stp->st_file = fp;
2992 stp->st_stateid.si_boot = boot_time;
2993 stp->st_stateid.si_stateownerid = sop->so_id;
2994 stp->st_stateid.si_fileid = fp->fi_id;
2995 stp->st_stateid.si_generation = 0;
2996 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2997 stp->st_access_bmap = open_stp->st_access_bmap;
2998 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2999 stp->st_openstp = open_stp;
1da177e4
LT		 3000
3001out:
3002 return stp;
3003}
3004
fd39ca9a 3005static int
1da177e4
LT		 3006check_lock_length(u64 offset, u64 length)
3007{
87df4de8 3008 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3009 LOFF_OVERFLOW(offset, length)));
3010}
3011
3012/*
3013 * LOCK operation
3014 */
b37ad28b 3015__be32
ca364317 3016nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3017 struct nfsd4_lock *lock)
1da177e4 3018{
3e9e3dbe 3019 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3020 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3021 struct nfs4_stateid *lock_stp;
3022 struct file *filp;
3023 struct file_lock file_lock;
8dc7c311 3024 struct file_lock conflock;
b37ad28b 3025 __be32 status = 0;
1da177e4 3026 unsigned int strhashval;
150b3934 3027 unsigned int cmd;
b8dd7b9a 3028 int err;
1da177e4
LT		 3029
3030 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3031 (long long) lock->lk_offset,
3032 (long long) lock->lk_length);
3033
1da177e4
LT		 3034 if (check_lock_length(lock->lk_offset, lock->lk_length))
3035 return nfserr_inval;
3036
ca364317 3037 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3038 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3039 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3040 return status;
3041 }
3042
1da177e4
LT		 3043 nfs4_lock_state();
3044
3045 if (lock->lk_is_new) {
893f8770
N		 3046 /*
3047 * Client indicates that this is a new lockowner.
3048 * Use open owner and open stateid to create lock owner and
3049 * lock stateid.
3050 */
1da177e4
LT		 3051 struct nfs4_stateid *open_stp = NULL;
3052 struct nfs4_file *fp;
3053
3054 status = nfserr_stale_clientid;
849823c5 3055 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3056 goto out;
1da177e4 3057
1da177e4 3058 /* validate and update open stateid and open seqid */
ca364317 3059 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3060 lock->lk_new_open_seqid,
3061 &lock->lk_new_open_stateid,
f3362737 3062 OPEN_STATE,
3a65588a 3063 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3064 lock);
37515177 3065 if (status)
1da177e4 3066 goto out;
3a65588a 3067 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3068 /* create lockowner and lock stateid */
3069 fp = open_stp->st_file;
3070 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3071 open_sop->so_client->cl_clientid.cl_id,
3072 &lock->v.new.owner);
3e9e3dbe
N		 3073 /* XXX: Do we need to check for duplicate stateowners on
3074 * the same file, or should they just be allowed (and
3075 * create new stateids)? */
1da177e4 3076 status = nfserr_resource;
b59e3c0e
NB		 3077 lock_sop = alloc_init_lock_stateowner(strhashval,
3078 open_sop->so_client, open_stp, lock);
3079 if (lock_sop == NULL)
1da177e4 3080 goto out;
b59e3c0e 3081 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3082 if (lock_stp == NULL)
1da177e4 3083 goto out;
1da177e4
LT		 3084 } else {
3085 /* lock (lock owner + lock stateid) already exists */
ca364317 3086 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3087 lock->lk_old_lock_seqid,
3088 &lock->lk_old_lock_stateid,
f3362737 3089 LOCK_STATE,
3a65588a 3090 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3091 if (status)
3092 goto out;
3a65588a 3093 lock_sop = lock->lk_replay_owner;
1da177e4 3094 }
3a65588a 3095 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3096 filp = lock_stp->st_vfs_file;
3097
0dd395dc 3098 status = nfserr_grace;
af558e33 3099 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3100 goto out;
3101 status = nfserr_no_grace;
af558e33 3102 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3103 goto out;
3104
1da177e4
LT		 3105 locks_init_lock(&file_lock);
3106 switch (lock->lk_type) {
3107 case NFS4_READ_LT:
3108 case NFS4_READW_LT:
3109 file_lock.fl_type = F_RDLCK;
150b3934 3110 cmd = F_SETLK;
1da177e4
LT		 3111 break;
3112 case NFS4_WRITE_LT:
3113 case NFS4_WRITEW_LT:
3114 file_lock.fl_type = F_WRLCK;
150b3934 3115 cmd = F_SETLK;
1da177e4
LT		 3116 break;
3117 default:
3118 status = nfserr_inval;
3119 goto out;
3120 }
b59e3c0e 3121 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3122 file_lock.fl_pid = current->tgid;
3123 file_lock.fl_file = filp;
3124 file_lock.fl_flags = FL_POSIX;
d5b9026a 3125 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3126
3127 file_lock.fl_start = lock->lk_offset;
87df4de8 3128 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3129 nfs4_transform_lock_offset(&file_lock);
3130
3131 /*
3132 * Try to lock the file in the VFS.
3133 * Note: locks.c uses the BKL to protect the inode's lock list.
3134 */
3135
fd85b817 3136 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3137 switch (-err) {
1da177e4
LT		 3138 case 0: /* success! */
3139 update_stateid(&lock_stp->st_stateid);
3140 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3141 sizeof(stateid_t));
b8dd7b9a 3142 status = 0;
eb76b3fd
AA		 3143 break;
3144 case (EAGAIN): /* conflock holds conflicting lock */
3145 status = nfserr_denied;
3146 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3147 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3148 break;
1da177e4
LT		 3149 case (EDEADLK):
3150 status = nfserr_deadlock;
eb76b3fd 3151 break;
1da177e4 3152 default:
fd85b817 3153 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3154 status = nfserr_resource;
3155 break;
1da177e4 3156 }
1da177e4 3157out:
8a280510 3158 if (status && lock->lk_is_new && lock_sop)
f044ff83 3159 release_lockowner(lock_sop);
3a65588a
BF		 3160 if (lock->lk_replay_owner) {
3161 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3162 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3163 }
1da177e4
LT		 3164 nfs4_unlock_state();
3165 return status;
3166}
3167
55ef1274
BF		 3168/*
3169 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3170 * so we do a temporary open here just to get an open file to pass to
3171 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3172 * inode operation.)
3173 */
3174static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3175{
3176 struct file *file;
3177 int err;
3178
3179 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3180 if (err)
3181 return err;
3182 err = vfs_test_lock(file, lock);
3183 nfsd_close(file);
3184 return err;
3185}
3186
1da177e4
LT		 3187/*
3188 * LOCKT operation
3189 */
b37ad28b 3190__be32
ca364317
BF		 3191nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3192 struct nfsd4_lockt *lockt)
1da177e4
LT		 3193{
3194 struct inode *inode;
1da177e4 3195 struct file_lock file_lock;
fd85b817 3196 int error;
b37ad28b 3197 __be32 status;
1da177e4 3198
af558e33 3199 if (locks_in_grace())
1da177e4
LT		 3200 return nfserr_grace;
3201
3202 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3203 return nfserr_inval;
3204
3205 lockt->lt_stateowner = NULL;
3206 nfs4_lock_state();
3207
3208 status = nfserr_stale_clientid;
849823c5 3209 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3210 goto out;
1da177e4 3211
ca364317 3212 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3213 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3214 if (status == nfserr_symlink)
3215 status = nfserr_inval;
3216 goto out;
3217 }
3218
ca364317 3219 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3220 locks_init_lock(&file_lock);
3221 switch (lockt->lt_type) {
3222 case NFS4_READ_LT:
3223 case NFS4_READW_LT:
3224 file_lock.fl_type = F_RDLCK;
3225 break;
3226 case NFS4_WRITE_LT:
3227 case NFS4_WRITEW_LT:
3228 file_lock.fl_type = F_WRLCK;
3229 break;
3230 default:
2fdada03 3231 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3232 status = nfserr_inval;
3233 goto out;
3234 }
3235
3236 lockt->lt_stateowner = find_lockstateowner_str(inode,
3237 &lockt->lt_clientid, &lockt->lt_owner);
3238 if (lockt->lt_stateowner)
3239 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3240 file_lock.fl_pid = current->tgid;
3241 file_lock.fl_flags = FL_POSIX;
3242
3243 file_lock.fl_start = lockt->lt_offset;
87df4de8 3244 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3245
3246 nfs4_transform_lock_offset(&file_lock);
3247
1da177e4 3248 status = nfs_ok;
55ef1274 3249 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3250 if (error) {
3251 status = nfserrno(error);
3252 goto out;
3253 }
9d6a8c5c 3254 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3255 status = nfserr_denied;
9d6a8c5c 3256 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3257 }
3258out:
3259 nfs4_unlock_state();
3260 return status;
3261}
3262
b37ad28b 3263__be32
ca364317 3264nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3265 struct nfsd4_locku *locku)
1da177e4
LT		 3266{
3267 struct nfs4_stateid *stp;
3268 struct file *filp = NULL;
3269 struct file_lock file_lock;
b37ad28b 3270 __be32 status;
b8dd7b9a 3271 int err;
1da177e4
LT		 3272
3273 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3274 (long long) locku->lu_offset,
3275 (long long) locku->lu_length);
3276
3277 if (check_lock_length(locku->lu_offset, locku->lu_length))
3278 return nfserr_inval;
3279
3280 nfs4_lock_state();
3281
ca364317 3282 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 3283 locku->lu_seqid,
3284 &locku->lu_stateid,
f3362737 3285 LOCK_STATE,
1da177e4
LT		 3286 &locku->lu_stateowner, &stp, NULL)))
3287 goto out;
3288
3289 filp = stp->st_vfs_file;
3290 BUG_ON(!filp);
3291 locks_init_lock(&file_lock);
3292 file_lock.fl_type = F_UNLCK;
3293 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3294 file_lock.fl_pid = current->tgid;
3295 file_lock.fl_file = filp;
3296 file_lock.fl_flags = FL_POSIX;
d5b9026a 3297 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3298 file_lock.fl_start = locku->lu_offset;
3299
87df4de8 3300 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3301 nfs4_transform_lock_offset(&file_lock);
3302
3303 /*
3304 * Try to unlock the file in the VFS.
3305 */
fd85b817 3306 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3307 if (err) {
fd85b817 3308 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3309 goto out_nfserr;
3310 }
3311 /*
3312 * OK, unlock succeeded; the only thing left to do is update the stateid.
3313 */
3314 update_stateid(&stp->st_stateid);
3315 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3316
3317out:
f2327d9a 3318 if (locku->lu_stateowner) {
1da177e4 3319 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3320 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3321 }
1da177e4
LT		 3322 nfs4_unlock_state();
3323 return status;
3324
3325out_nfserr:
b8dd7b9a 3326 status = nfserrno(err);
1da177e4
LT		 3327 goto out;
3328}
3329
3330/*
3331 * returns
3332 * 1: locks held by lockowner
3333 * 0: no locks held by lockowner
3334 */
3335static int
3336check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3337{
3338 struct file_lock **flpp;
7eaa36e2 3339 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3340 int status = 0;
3341
3342 lock_kernel();
3343 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3344 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3345 status = 1;
3346 goto out;
796dadfd 3347 }
1da177e4
LT		 3348 }
3349out:
3350 unlock_kernel();
3351 return status;
3352}
3353
b37ad28b 3354__be32
b591480b
BF		 3355nfsd4_release_lockowner(struct svc_rqst *rqstp,
3356 struct nfsd4_compound_state *cstate,
3357 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3358{
3359 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3360 struct nfs4_stateowner *sop;
3361 struct nfs4_stateid *stp;
1da177e4 3362 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3363 struct list_head matches;
3364 int i;
b37ad28b 3365 __be32 status;
1da177e4
LT		 3366
3367 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3368 clid->cl_boot, clid->cl_id);
3369
3370 /* XXX check for lease expiration */
3371
3372 status = nfserr_stale_clientid;
849823c5 3373 if (STALE_CLIENTID(clid))
1da177e4 3374 return status;
1da177e4
LT		 3375
3376 nfs4_lock_state();
3377
3e9e3dbe
N		 3378 status = nfserr_locks_held;
3379 /* XXX: we're doing a linear search through all the lockowners.
3380 * Yipes! For now we'll just hope clients aren't really using
3381 * release_lockowner much, but eventually we have to fix these
3382 * data structures. */
3383 INIT_LIST_HEAD(&matches);
3384 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3385 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3386 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3387 continue;
3388 list_for_each_entry(stp, &sop->so_stateids,
3389 st_perstateowner) {
3390 if (check_for_locks(stp->st_vfs_file, sop))
3391 goto out;
3392 /* Note: so_perclient unused for lockowners,
3393 * so it's OK to fool with here. */
3394 list_add(&sop->so_perclient, &matches);
3395 }
1da177e4 3396 }
3e9e3dbe
N		 3397 }
3398 /* Clients probably won't expect us to return with some (but not all)
3399 * of the lockowner state released; so don't release any until all
3400 * have been checked. */
3401 status = nfs_ok;
0fa822e4
N		 3402 while (!list_empty(&matches)) {
3403 sop = list_entry(matches.next, struct nfs4_stateowner,
3404 so_perclient);
3405 /* unhash_stateowner deletes so_perclient only
3406 * for openowners. */
3407 list_del(&sop->so_perclient);
f044ff83 3408 release_lockowner(sop);
1da177e4
LT		 3409 }
3410out:
3411 nfs4_unlock_state();
3412 return status;
3413}
3414
3415static inline struct nfs4_client_reclaim *
a55370a3 3416alloc_reclaim(void)
1da177e4 3417{
a55370a3 3418 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3419}
3420
c7b9a459 3421int
a1bcecd2 3422nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3423{
3424 unsigned int strhashval = clientstr_hashval(name);
3425 struct nfs4_client *clp;
3426
a1bcecd2 3427 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3428 return clp ? 1 : 0;
3429}
3430
1da177e4
LT		 3431/*
3432 * failure => all reset bets are off, nfserr_no_grace...
3433 */
190e4fbf
N		 3434int
3435nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3436{
3437 unsigned int strhashval;
3438 struct nfs4_client_reclaim *crp = NULL;
3439
a55370a3
N		 3440 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3441 crp = alloc_reclaim();
1da177e4
LT		 3442 if (!crp)
3443 return 0;
a55370a3 3444 strhashval = clientstr_hashval(name);
1da177e4
LT		 3445 INIT_LIST_HEAD(&crp->cr_strhash);
3446 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3447 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3448 reclaim_str_hashtbl_size++;
3449 return 1;
3450}
3451
3452static void
3453nfs4_release_reclaim(void)
3454{
3455 struct nfs4_client_reclaim *crp = NULL;
3456 int i;
3457
1da177e4
LT		 3458 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3459 while (!list_empty(&reclaim_str_hashtbl[i])) {
3460 crp = list_entry(reclaim_str_hashtbl[i].next,
3461 struct nfs4_client_reclaim, cr_strhash);
3462 list_del(&crp->cr_strhash);
1da177e4
LT		 3463 kfree(crp);
3464 reclaim_str_hashtbl_size--;
3465 }
3466 }
3467 BUG_ON(reclaim_str_hashtbl_size);
3468}
3469
3470/*
3471 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3472static struct nfs4_client_reclaim *
1da177e4
LT		 3473nfs4_find_reclaim_client(clientid_t *clid)
3474{
3475 unsigned int strhashval;
3476 struct nfs4_client *clp;
3477 struct nfs4_client_reclaim *crp = NULL;
3478
3479
3480 /* find clientid in conf_id_hashtbl */
3481 clp = find_confirmed_client(clid);
3482 if (clp == NULL)
3483 return NULL;
3484
a55370a3
N		 3485 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3486 clp->cl_name.len, clp->cl_name.data,
3487 clp->cl_recdir);
1da177e4
LT		 3488
3489 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3490 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3491 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3492 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3493 return crp;
3494 }
3495 }
3496 return NULL;
3497}
3498
3499/*
3500* Called from OPEN. Look for clientid in reclaim list.
3501*/
b37ad28b 3502__be32
1da177e4
LT		 3503nfs4_check_open_reclaim(clientid_t *clid)
3504{
dfc83565 3505 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3506}
3507
ac4d8ff2 3508/* initialization to perform at module load time: */
1da177e4 3509
e8ff2a84 3510int
ac4d8ff2 3511nfs4_state_init(void)
1da177e4 3512{
e8ff2a84 3513 int i, status;
1da177e4 3514
e8ff2a84
BF		 3515 status = nfsd4_init_slabs();
3516 if (status)
3517 return status;
1da177e4
LT		 3518 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3519 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3520 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3521 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3522 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3523 }
5282fd72
ME		 3524 for (i = 0; i < SESSION_HASH_SIZE; i++)
3525 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 3526 for (i = 0; i < FILE_HASH_SIZE; i++) {
3527 INIT_LIST_HEAD(&file_hashtbl[i]);
3528 }
3529 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3530 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3531 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3532 }
3533 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3534 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3535 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3536 }
3537 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3538 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3539 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3540 }
1da177e4 3541 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3542 INIT_LIST_HEAD(&close_lru);
3543 INIT_LIST_HEAD(&client_lru);
3544 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3545 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3546 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3547 reclaim_str_hashtbl_size = 0;
e8ff2a84 3548 return 0;
ac4d8ff2
N		 3549}
3550
190e4fbf
N		 3551static void
3552nfsd4_load_reboot_recovery_data(void)
3553{
3554 int status;
3555
0964a3d3
N		 3556 nfs4_lock_state();
3557 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3558 status = nfsd4_recdir_load();
0964a3d3 3559 nfs4_unlock_state();
190e4fbf
N		 3560 if (status)
3561 printk("NFSD: Failure reading reboot recovery data\n");
3562}
3563
9a8db97e
ME		 3564unsigned long
3565get_nfs4_grace_period(void)
3566{
3567 return max(user_lease_time, lease_time) * HZ;
3568}
3569
c2f1a551
MS		 3570/*
3571 * Since the lifetime of a delegation isn't limited to that of an open, a
3572 * client may quite reasonably hang on to a delegation as long as it has
3573 * the inode cached. This becomes an obvious problem the first time a
3574 * client's inode cache approaches the size of the server's total memory.
3575 *
3576 * For now we avoid this problem by imposing a hard limit on the number
3577 * of delegations, which varies according to the server's memory size.
3578 */
3579static void
3580set_max_delegations(void)
3581{
3582 /*
3583 * Allow at most 4 delegations per megabyte of RAM. Quick
3584 * estimates suggest that in the worst case (where every delegation
3585 * is for a different inode), a delegation could take about 1.5K,
3586 * giving a worst case usage of about 6% of memory.
3587 */
3588 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3589}
3590
ac4d8ff2
N		 3591/* initialization to perform when the nfsd service is started: */
3592
3593static void
3594__nfs4_state_start(void)
3595{
9a8db97e 3596 unsigned long grace_time;
ac4d8ff2 3597
1da177e4 3598 boot_time = get_seconds();
af558e33 3599 grace_time = get_nfs4_grace_period();
d99a05ad 3600 lease_time = user_lease_time;
af558e33 3601 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3602 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3603 grace_time/HZ);
58da282b 3604 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3605 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3606 set_max_delegations();
1da177e4
LT		 3607}
3608
e8ff2a84 3609void
76a3550e 3610nfs4_state_start(void)
1da177e4 3611{
1da177e4 3612 if (nfs4_init)
e8ff2a84 3613 return;
190e4fbf 3614 nfsd4_load_reboot_recovery_data();
76a3550e 3615 __nfs4_state_start();
1da177e4 3616 nfs4_init = 1;
e8ff2a84 3617 return;
1da177e4
LT		 3618}
3619
1da177e4
LT		 3620time_t
3621nfs4_lease_time(void)
3622{
3623 return lease_time;
3624}
3625
3626static void
3627__nfs4_state_shutdown(void)
3628{
3629 int i;
3630 struct nfs4_client *clp = NULL;
3631 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3632 struct list_head *pos, *next, reaplist;
3633
1da177e4
LT		 3634 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3635 while (!list_empty(&conf_id_hashtbl[i])) {
3636 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3637 expire_client(clp);
3638 }
3639 while (!list_empty(&unconf_str_hashtbl[i])) {
3640 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3641 expire_client(clp);
3642 }
3643 }
3644 INIT_LIST_HEAD(&reaplist);
3645 spin_lock(&recall_lock);
3646 list_for_each_safe(pos, next, &del_recall_lru) {
3647 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3648 list_move(&dp->dl_recall_lru, &reaplist);
3649 }
3650 spin_unlock(&recall_lock);
3651 list_for_each_safe(pos, next, &reaplist) {
3652 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3653 list_del_init(&dp->dl_recall_lru);
3654 unhash_delegation(dp);
3655 }
3656
190e4fbf 3657 nfsd4_shutdown_recdir();
1da177e4 3658 nfs4_init = 0;
1da177e4
LT		 3659}
3660
3661void
3662nfs4_state_shutdown(void)
3663{
5e8d5c29
N		 3664 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3665 destroy_workqueue(laundry_wq);
2c5e7615 3666 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3667 nfs4_lock_state();
3668 nfs4_release_reclaim();
3669 __nfs4_state_shutdown();
1da177e4
LT		 3670 nfs4_unlock_state();
3671}
3672
3dd98a3b
JL		 3673/*
3674 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3675 * accessed when nfsd is starting.
3676 */
0964a3d3
N		 3677static void
3678nfs4_set_recdir(char *recdir)
3679{
0964a3d3 3680 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3681}
3682
3683/*
3684 * Change the NFSv4 recovery directory to recdir.
3685 */
3686int
3687nfs4_reset_recoverydir(char *recdir)
3688{
3689 int status;
a63bb996 3690 struct path path;
0964a3d3 3691
a63bb996 3692 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3693 if (status)
3694 return status;
3695 status = -ENOTDIR;
a63bb996 3696 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3697 nfs4_set_recdir(recdir);
3698 status = 0;
3699 }
a63bb996 3700 path_put(&path);
0964a3d3
N		 3701 return status;
3702}
3703
3dd98a3b
JL		 3704char *
3705nfs4_recoverydir(void)
3706{
3707 return user_recovery_dirname;
3708}
3709
1da177e4
LT		 3710/*
3711 * Called when leasetime is changed.
3712 *
d99a05ad
N		 3713 * The only way the protocol gives us to handle on-the-fly lease changes is to
3714 * simulate a reboot. Instead of doing that, we just wait till the next time
3715 * we start to register any changes in lease time. If the administrator
3716 * really wants to change the lease time *now*, they can go ahead and bring
3717 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3718 *
3719 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3720 * when nfsd is starting
1da177e4
LT		 3721 */
3722void
3723nfs4_reset_lease(time_t leasetime)
3724{
d99a05ad 3725 user_lease_time = leasetime;
1da177e4 3726}
Linux kernel - Deliverables
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