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const: make file_lock_operations const
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
ec6b5d7b 71static u64 current_sessionid = 1;
fd39ca9a
N		 72
73#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
74#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 75
1da177e4 76/* forward declarations */
fd39ca9a 77static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4 78static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
0964a3d3
N		 79static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
1da177e4 81
8b671b80
BF		 82/* Locking: */
83
84/* Currently used for almost all code touching nfsv4 state: */
353ab6e9 85static DEFINE_MUTEX(client_mutex);
1da177e4 86
8b671b80
BF		 87/*
88 * Currently used for the del_recall_lru and file hash table. In an
89 * effort to decrease the scope of the client_mutex, this spinlock may
90 * eventually cover more:
91 */
92static DEFINE_SPINLOCK(recall_lock);
93
e18b890b
CL		 94static struct kmem_cache *stateowner_slab = NULL;
95static struct kmem_cache *file_slab = NULL;
96static struct kmem_cache *stateid_slab = NULL;
97static struct kmem_cache *deleg_slab = NULL;
e60d4398 98
1da177e4
LT		 99void
100nfs4_lock_state(void)
101{
353ab6e9 102 mutex_lock(&client_mutex);
1da177e4
LT		 103}
104
105void
106nfs4_unlock_state(void)
107{
353ab6e9 108 mutex_unlock(&client_mutex);
1da177e4
LT		 109}
110
111static inline u32
112opaque_hashval(const void *ptr, int nbytes)
113{
114 unsigned char *cptr = (unsigned char *) ptr;
115
116 u32 x = 0;
117 while (nbytes--) {
118 x *= 37;
119 x += *cptr++;
120 }
121 return x;
122}
123
1da177e4
LT		 124static struct list_head del_recall_lru;
125
13cd2184
N		 126static inline void
127put_nfs4_file(struct nfs4_file *fi)
128{
8b671b80
BF		 129 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
130 list_del(&fi->fi_hash);
131 spin_unlock(&recall_lock);
132 iput(fi->fi_inode);
133 kmem_cache_free(file_slab, fi);
134 }
13cd2184
N		 135}
136
137static inline void
138get_nfs4_file(struct nfs4_file *fi)
139{
8b671b80 140 atomic_inc(&fi->fi_ref);
13cd2184
N		 141}
142
ef0f3390 143static int num_delegations;
c2f1a551 144unsigned int max_delegations;
ef0f3390
N		 145
146/*
147 * Open owner state (share locks)
148 */
149
150/* hash tables for nfs4_stateowner */
151#define OWNER_HASH_BITS 8
152#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
153#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
154
155#define ownerid_hashval(id) \
156 ((id) & OWNER_HASH_MASK)
157#define ownerstr_hashval(clientid, ownername) \
158 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
159
160static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
161static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
162
163/* hash table for nfs4_file */
164#define FILE_HASH_BITS 8
165#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
166#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
167/* hash table for (open)nfs4_stateid */
168#define STATEID_HASH_BITS 10
169#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
170#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
171
172#define file_hashval(x) \
173 hash_ptr(x, FILE_HASH_BITS)
174#define stateid_hashval(owner_id, file_id) \
175 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
176
177static struct list_head file_hashtbl[FILE_HASH_SIZE];
178static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
179
1da177e4
LT		 180static struct nfs4_delegation *
181alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
182{
183 struct nfs4_delegation *dp;
184 struct nfs4_file *fp = stp->st_file;
c237dc03 185 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
1da177e4
LT		 186
187 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 188 if (fp->fi_had_conflict)
189 return NULL;
c2f1a551 190 if (num_delegations > max_delegations)
ef0f3390 191 return NULL;
5b2d21c1
N		 192 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
193 if (dp == NULL)
1da177e4 194 return dp;
ef0f3390 195 num_delegations++;
ea1da636
N		 196 INIT_LIST_HEAD(&dp->dl_perfile);
197 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 198 INIT_LIST_HEAD(&dp->dl_recall_lru);
199 dp->dl_client = clp;
13cd2184 200 get_nfs4_file(fp);
1da177e4
LT		 201 dp->dl_file = fp;
202 dp->dl_flock = NULL;
203 get_file(stp->st_vfs_file);
204 dp->dl_vfs_file = stp->st_vfs_file;
205 dp->dl_type = type;
b53d40c5 206 dp->dl_ident = cb->cb_ident;
78155ed7 207 dp->dl_stateid.si_boot = get_seconds();
1da177e4
LT		 208 dp->dl_stateid.si_stateownerid = current_delegid++;
209 dp->dl_stateid.si_fileid = 0;
210 dp->dl_stateid.si_generation = 0;
6c02eaa1 211 fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
1da177e4
LT		 212 dp->dl_time = 0;
213 atomic_set(&dp->dl_count, 1);
ea1da636
N		 214 list_add(&dp->dl_perfile, &fp->fi_delegations);
215 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 216 return dp;
217}
218
219void
220nfs4_put_delegation(struct nfs4_delegation *dp)
221{
222 if (atomic_dec_and_test(&dp->dl_count)) {
223 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 224 put_nfs4_file(dp->dl_file);
5b2d21c1 225 kmem_cache_free(deleg_slab, dp);
ef0f3390 226 num_delegations--;
1da177e4
LT		 227 }
228}
229
230/* Remove the associated file_lock first, then remove the delegation.
231 * lease_modify() is called to remove the FS_LEASE file_lock from
232 * the i_flock list, eventually calling nfsd's lock_manager
233 * fl_release_callback.
234 */
235static void
236nfs4_close_delegation(struct nfs4_delegation *dp)
237{
238 struct file *filp = dp->dl_vfs_file;
239
240 dprintk("NFSD: close_delegation dp %p\n",dp);
241 dp->dl_vfs_file = NULL;
242 /* The following nfsd_close may not actually close the file,
243 * but we want to remove the lease in any case. */
c907132d 244 if (dp->dl_flock)
a9933cea 245 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 246 nfsd_close(filp);
1da177e4
LT		 247}
248
249/* Called under the state lock. */
250static void
251unhash_delegation(struct nfs4_delegation *dp)
252{
ea1da636
N		 253 list_del_init(&dp->dl_perfile);
254 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 255 spin_lock(&recall_lock);
256 list_del_init(&dp->dl_recall_lru);
257 spin_unlock(&recall_lock);
258 nfs4_close_delegation(dp);
259 nfs4_put_delegation(dp);
260}
261
262/*
263 * SETCLIENTID state
264 */
265
266/* Hash tables for nfs4_clientid state */
267#define CLIENT_HASH_BITS 4
268#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
269#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
270
271#define clientid_hashval(id) \
272 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 273#define clientstr_hashval(name) \
274 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 275/*
276 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
277 * used in reboot/reset lease grace period processing
278 *
279 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
280 * setclientid_confirmed info.
281 *
282 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
283 * setclientid info.
284 *
285 * client_lru holds client queue ordered by nfs4_client.cl_time
286 * for lease renewal.
287 *
288 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
289 * for last close replay.
290 */
291static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
292static int reclaim_str_hashtbl_size = 0;
293static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
294static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
295static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
296static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
297static struct list_head client_lru;
298static struct list_head close_lru;
299
2283963f
BF		 300static void unhash_generic_stateid(struct nfs4_stateid *stp)
301{
302 list_del(&stp->st_hash);
303 list_del(&stp->st_perfile);
304 list_del(&stp->st_perstateowner);
305}
306
307static void free_generic_stateid(struct nfs4_stateid *stp)
308{
309 put_nfs4_file(stp->st_file);
310 kmem_cache_free(stateid_slab, stp);
311}
312
313static void release_lock_stateid(struct nfs4_stateid *stp)
314{
315 unhash_generic_stateid(stp);
316 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
317 free_generic_stateid(stp);
318}
319
f044ff83
BF		 320static void unhash_lockowner(struct nfs4_stateowner *sop)
321{
322 struct nfs4_stateid *stp;
323
324 list_del(&sop->so_idhash);
325 list_del(&sop->so_strhash);
326 list_del(&sop->so_perstateid);
327 while (!list_empty(&sop->so_stateids)) {
328 stp = list_first_entry(&sop->so_stateids,
329 struct nfs4_stateid, st_perstateowner);
330 release_lock_stateid(stp);
331 }
332}
333
334static void release_lockowner(struct nfs4_stateowner *sop)
335{
336 unhash_lockowner(sop);
337 nfs4_put_stateowner(sop);
338}
339
f1d110ca
BF		 340static void
341release_stateid_lockowners(struct nfs4_stateid *open_stp)
342{
343 struct nfs4_stateowner *lock_sop;
344
345 while (!list_empty(&open_stp->st_lockowners)) {
346 lock_sop = list_entry(open_stp->st_lockowners.next,
347 struct nfs4_stateowner, so_perstateid);
348 /* list_del(&open_stp->st_lockowners); */
349 BUG_ON(lock_sop->so_is_open_owner);
f044ff83 350 release_lockowner(lock_sop);
f1d110ca
BF		 351 }
352}
353
2283963f
BF		 354static void release_open_stateid(struct nfs4_stateid *stp)
355{
356 unhash_generic_stateid(stp);
357 release_stateid_lockowners(stp);
358 nfsd_close(stp->st_vfs_file);
359 free_generic_stateid(stp);
360}
361
f044ff83 362static void unhash_openowner(struct nfs4_stateowner *sop)
f1d110ca
BF		 363{
364 struct nfs4_stateid *stp;
365
366 list_del(&sop->so_idhash);
367 list_del(&sop->so_strhash);
f044ff83
BF		 368 list_del(&sop->so_perclient);
369 list_del(&sop->so_perstateid); /* XXX: necessary? */
f1d110ca 370 while (!list_empty(&sop->so_stateids)) {
f044ff83
BF		 371 stp = list_first_entry(&sop->so_stateids,
372 struct nfs4_stateid, st_perstateowner);
373 release_open_stateid(stp);
f1d110ca
BF		 374 }
375}
376
f044ff83 377static void release_openowner(struct nfs4_stateowner *sop)
f1d110ca 378{
f044ff83 379 unhash_openowner(sop);
f1d110ca
BF		 380 list_del(&sop->so_close_lru);
381 nfs4_put_stateowner(sop);
382}
383
5282fd72
ME		 384static DEFINE_SPINLOCK(sessionid_lock);
385#define SESSION_HASH_SIZE 512
386static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
387
388static inline int
389hash_sessionid(struct nfs4_sessionid *sessionid)
390{
391 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
392
393 return sid->sequence % SESSION_HASH_SIZE;
394}
395
396static inline void
397dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
398{
399 u32 *ptr = (u32 *)(&sessionid->data[0]);
400 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
401}
402
ec6b5d7b
AA		 403static void
404gen_sessionid(struct nfsd4_session *ses)
405{
406 struct nfs4_client *clp = ses->se_client;
407 struct nfsd4_sessionid *sid;
408
409 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
410 sid->clientid = clp->cl_clientid;
411 sid->sequence = current_sessionid++;
412 sid->reserved = 0;
413}
414
415/*
416 * Give the client the number of slots it requests bound by
417 * NFSD_MAX_SLOTS_PER_SESSION and by sv_drc_max_pages.
418 *
419 * If we run out of pages (sv_drc_pages_used == sv_drc_max_pages) we
420 * should (up to a point) re-negotiate active sessions and reduce their
421 * slot usage to make rooom for new connections. For now we just fail the
422 * create session.
423 */
424static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
425{
426 int status = 0, np = fchan->maxreqs * NFSD_PAGES_PER_SLOT;
427
5d77ddfb
AA		 428 if (fchan->maxreqs < 1)
429 return nfserr_inval;
430 else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
431 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
432
ec6b5d7b
AA		 433 spin_lock(&nfsd_serv->sv_lock);
434 if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
435 np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;
436 nfsd_serv->sv_drc_pages_used += np;
437 spin_unlock(&nfsd_serv->sv_lock);
438
439 if (np <= 0) {
440 status = nfserr_resource;
441 fchan->maxreqs = 0;
442 } else
443 fchan->maxreqs = np / NFSD_PAGES_PER_SLOT;
444
445 return status;
446}
447
448/*
449 * fchan holds the client values on input, and the server values on output
450 */
451static int init_forechannel_attrs(struct svc_rqst *rqstp,
6c18ba9f
AB		 452 struct nfsd4_channel_attrs *session_fchan,
453 struct nfsd4_channel_attrs *fchan)
ec6b5d7b
AA		 454{
455 int status = 0;
456 __u32 maxcount = svc_max_payload(rqstp);
457
458 /* headerpadsz set to zero in encode routine */
459
460 /* Use the client's max request and max response size if possible */
461 if (fchan->maxreq_sz > maxcount)
462 fchan->maxreq_sz = maxcount;
6c18ba9f 463 session_fchan->maxreq_sz = fchan->maxreq_sz;
ec6b5d7b
AA		 464
465 if (fchan->maxresp_sz > maxcount)
466 fchan->maxresp_sz = maxcount;
6c18ba9f 467 session_fchan->maxresp_sz = fchan->maxresp_sz;
ec6b5d7b
AA		 468
469 /* Set the max response cached size our default which is
470 * a multiple of PAGE_SIZE and small */
6c18ba9f
AB		 471 session_fchan->maxresp_cached = NFSD_PAGES_PER_SLOT * PAGE_SIZE;
472 fchan->maxresp_cached = session_fchan->maxresp_cached;
ec6b5d7b
AA		 473
474 /* Use the client's maxops if possible */
475 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
476 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
6c18ba9f 477 session_fchan->maxops = fchan->maxops;
ec6b5d7b
AA		 478
479 /* try to use the client requested number of slots */
480 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
481 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
482
483 /* FIXME: Error means no more DRC pages so the server should
484 * recover pages from existing sessions. For now fail session
485 * creation.
486 */
487 status = set_forechannel_maxreqs(fchan);
488
6c18ba9f 489 session_fchan->maxreqs = fchan->maxreqs;
ec6b5d7b
AA		 490 return status;
491}
492
493static int
494alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
495 struct nfsd4_create_session *cses)
496{
497 struct nfsd4_session *new, tmp;
498 int idx, status = nfserr_resource, slotsize;
499
500 memset(&tmp, 0, sizeof(tmp));
501
502 /* FIXME: For now, we just accept the client back channel attributes. */
6c18ba9f
AB		 503 tmp.se_bchannel = cses->back_channel;
504 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
505 &cses->fore_channel);
ec6b5d7b
AA		 506 if (status)
507 goto out;
508
509 /* allocate struct nfsd4_session and slot table in one piece */
6c18ba9f 510 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot);
ec6b5d7b
AA		 511 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
512 if (!new)
513 goto out;
514
515 memcpy(new, &tmp, sizeof(*new));
516
517 new->se_client = clp;
518 gen_sessionid(new);
519 idx = hash_sessionid(&new->se_sessionid);
520 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
521 NFS4_MAX_SESSIONID_LEN);
522
523 new->se_flags = cses->flags;
524 kref_init(&new->se_ref);
525 spin_lock(&sessionid_lock);
526 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
527 list_add(&new->se_perclnt, &clp->cl_sessions);
528 spin_unlock(&sessionid_lock);
529
530 status = nfs_ok;
531out:
532 return status;
533}
534
5282fd72
ME		 535/* caller must hold sessionid_lock */
536static struct nfsd4_session *
537find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
538{
539 struct nfsd4_session *elem;
540 int idx;
541
542 dump_sessionid(__func__, sessionid);
543 idx = hash_sessionid(sessionid);
544 dprintk("%s: idx is %d\n", __func__, idx);
545 /* Search in the appropriate list */
546 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
547 dump_sessionid("list traversal", &elem->se_sessionid);
548 if (!memcmp(elem->se_sessionid.data, sessionid->data,
549 NFS4_MAX_SESSIONID_LEN)) {
550 return elem;
551 }
552 }
553
554 dprintk("%s: session not found\n", __func__);
555 return NULL;
556}
557
558/* caller must hold sessionid_lock */
7116ed6b 559static void
5282fd72 560unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 561{
562 list_del(&ses->se_hash);
563 list_del(&ses->se_perclnt);
5282fd72
ME		 564}
565
566static void
567release_session(struct nfsd4_session *ses)
568{
569 spin_lock(&sessionid_lock);
570 unhash_session(ses);
571 spin_unlock(&sessionid_lock);
7116ed6b
AA		 572 nfsd4_put_session(ses);
573}
574
14778a13
AA		 575static void nfsd4_release_respages(struct page **respages, short resused);
576
7116ed6b
AA		 577void
578free_session(struct kref *kref)
579{
580 struct nfsd4_session *ses;
14778a13 581 int i;
7116ed6b
AA		 582
583 ses = container_of(kref, struct nfsd4_session, se_ref);
6c18ba9f 584 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
14778a13
AA		 585 struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
586 nfsd4_release_respages(e->ce_respages, e->ce_resused);
587 }
7116ed6b
AA		 588 kfree(ses);
589}
590
1da177e4
LT		 591static inline void
592renew_client(struct nfs4_client *clp)
593{
594 /*
595 * Move client to the end to the LRU list.
596 */
597 dprintk("renewing client (clientid %08x/%08x)\n",
598 clp->cl_clientid.cl_boot,
599 clp->cl_clientid.cl_id);
600 list_move_tail(&clp->cl_lru, &client_lru);
601 clp->cl_time = get_seconds();
602}
603
604/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
605static int
606STALE_CLIENTID(clientid_t *clid)
607{
608 if (clid->cl_boot == boot_time)
609 return 0;
60adfc50
AA		 610 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
611 clid->cl_boot, clid->cl_id, boot_time);
1da177e4
LT		 612 return 1;
613}
614
615/*
616 * XXX Should we use a slab cache ?
617 * This type of memory management is somewhat inefficient, but we use it
618 * anyway since SETCLIENTID is not a common operation.
619 */
35bba9a3 620static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 621{
622 struct nfs4_client *clp;
623
35bba9a3
BF		 624 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
625 if (clp == NULL)
626 return NULL;
627 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
628 if (clp->cl_name.data == NULL) {
629 kfree(clp);
630 return NULL;
1da177e4 631 }
35bba9a3
BF		 632 memcpy(clp->cl_name.data, name.data, name.len);
633 clp->cl_name.len = name.len;
1da177e4
LT		 634 return clp;
635}
636
1b1a9b31
BF		 637static void
638shutdown_callback_client(struct nfs4_client *clp)
639{
c237dc03 640 struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
1b1a9b31 641
1b1a9b31 642 if (clnt) {
404ec117
BF		 643 /*
644 * Callback threads take a reference on the client, so there
645 * should be no outstanding callbacks at this point.
646 */
c237dc03 647 clp->cl_cb_conn.cb_client = NULL;
1b1a9b31
BF		 648 rpc_shutdown_client(clnt);
649 }
c237dc03
BF		 650 if (clp->cl_cb_conn.cb_cred) {
651 put_rpccred(clp->cl_cb_conn.cb_cred);
652 clp->cl_cb_conn.cb_cred = NULL;
3cef9ab2 653 }
1b1a9b31
BF		 654}
655
1da177e4
LT		 656static inline void
657free_client(struct nfs4_client *clp)
658{
1b1a9b31 659 shutdown_callback_client(clp);
38eb76a5
AA		 660 nfsd4_release_respages(clp->cl_slot.sl_cache_entry.ce_respages,
661 clp->cl_slot.sl_cache_entry.ce_resused);
1da177e4
LT		 662 if (clp->cl_cred.cr_group_info)
663 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 664 kfree(clp->cl_principal);
1da177e4
LT		 665 kfree(clp->cl_name.data);
666 kfree(clp);
667}
668
669void
670put_nfs4_client(struct nfs4_client *clp)
671{
672 if (atomic_dec_and_test(&clp->cl_count))
673 free_client(clp);
674}
675
676static void
677expire_client(struct nfs4_client *clp)
678{
679 struct nfs4_stateowner *sop;
680 struct nfs4_delegation *dp;
1da177e4
LT		 681 struct list_head reaplist;
682
683 dprintk("NFSD: expire_client cl_count %d\n",
684 atomic_read(&clp->cl_count));
685
1da177e4
LT		 686 INIT_LIST_HEAD(&reaplist);
687 spin_lock(&recall_lock);
ea1da636
N		 688 while (!list_empty(&clp->cl_delegations)) {
689 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 690 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
691 dp->dl_flock);
ea1da636 692 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 693 list_move(&dp->dl_recall_lru, &reaplist);
694 }
695 spin_unlock(&recall_lock);
696 while (!list_empty(&reaplist)) {
697 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
698 list_del_init(&dp->dl_recall_lru);
699 unhash_delegation(dp);
700 }
701 list_del(&clp->cl_idhash);
702 list_del(&clp->cl_strhash);
703 list_del(&clp->cl_lru);
ea1da636
N		 704 while (!list_empty(&clp->cl_openowners)) {
705 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 706 release_openowner(sop);
1da177e4 707 }
c4bf7868
ME		 708 while (!list_empty(&clp->cl_sessions)) {
709 struct nfsd4_session *ses;
710 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
711 se_perclnt);
712 release_session(ses);
713 }
1da177e4
LT		 714 put_nfs4_client(clp);
715}
716
35bba9a3
BF		 717static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
718{
1da177e4
LT		 719 struct nfs4_client *clp;
720
35bba9a3
BF		 721 clp = alloc_client(name);
722 if (clp == NULL)
723 return NULL;
a55370a3 724 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4 725 atomic_set(&clp->cl_count, 1);
c237dc03 726 atomic_set(&clp->cl_cb_conn.cb_set, 0);
1da177e4
LT		 727 INIT_LIST_HEAD(&clp->cl_idhash);
728 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 729 INIT_LIST_HEAD(&clp->cl_openowners);
730 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 731 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 732 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 733 return clp;
734}
735
35bba9a3
BF		 736static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
737{
738 memcpy(target->cl_verifier.data, source->data,
739 sizeof(target->cl_verifier.data));
1da177e4
LT		 740}
741
35bba9a3
BF		 742static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
743{
1da177e4
LT		 744 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
745 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
746}
747
35bba9a3
BF		 748static void copy_cred(struct svc_cred *target, struct svc_cred *source)
749{
1da177e4
LT		 750 target->cr_uid = source->cr_uid;
751 target->cr_gid = source->cr_gid;
752 target->cr_group_info = source->cr_group_info;
753 get_group_info(target->cr_group_info);
754}
755
35bba9a3 756static int same_name(const char *n1, const char *n2)
599e0a22 757{
a55370a3 758 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 759}
760
761static int
599e0a22
BF		 762same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
763{
764 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 765}
766
767static int
599e0a22
BF		 768same_clid(clientid_t *cl1, clientid_t *cl2)
769{
770 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 771}
772
773/* XXX what about NGROUP */
774static int
599e0a22
BF		 775same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
776{
777 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 778}
779
5ec7b46c
BF		 780static void gen_clid(struct nfs4_client *clp)
781{
782 static u32 current_clientid = 1;
783
1da177e4
LT		 784 clp->cl_clientid.cl_boot = boot_time;
785 clp->cl_clientid.cl_id = current_clientid++;
786}
787
deda2faa
BF		 788static void gen_confirm(struct nfs4_client *clp)
789{
790 static u32 i;
791 u32 *p;
1da177e4 792
1da177e4 793 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 794 *p++ = get_seconds();
795 *p++ = i++;
1da177e4
LT		 796}
797
35bba9a3
BF		 798static int check_name(struct xdr_netobj name)
799{
1da177e4
LT		 800 if (name.len == 0)
801 return 0;
802 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 803 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 804 return 0;
805 }
806 return 1;
807}
808
fd39ca9a 809static void
1da177e4
LT		 810add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
811{
812 unsigned int idhashval;
813
814 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
815 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
816 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
817 list_add_tail(&clp->cl_lru, &client_lru);
818 clp->cl_time = get_seconds();
819}
820
fd39ca9a 821static void
1da177e4
LT		 822move_to_confirmed(struct nfs4_client *clp)
823{
824 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
825 unsigned int strhashval;
826
827 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
828 list_del_init(&clp->cl_strhash);
f116629d 829 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 830 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 831 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
832 renew_client(clp);
833}
834
835static struct nfs4_client *
836find_confirmed_client(clientid_t *clid)
837{
838 struct nfs4_client *clp;
839 unsigned int idhashval = clientid_hashval(clid->cl_id);
840
841 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 842 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 843 return clp;
844 }
845 return NULL;
846}
847
848static struct nfs4_client *
849find_unconfirmed_client(clientid_t *clid)
850{
851 struct nfs4_client *clp;
852 unsigned int idhashval = clientid_hashval(clid->cl_id);
853
854 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 855 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 856 return clp;
857 }
858 return NULL;
859}
860
a1bcecd2
AA		 861/*
862 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
863 * parameter. Matching is based on the fact the at least one of the
864 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
865 *
866 * FIXME: we need to unify the clientid namespaces for nfsv4.x
867 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
868 * and SET_CLIENTID{,_CONFIRM}
869 */
870static inline int
871match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
872{
873 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
874 return use_exchange_id == has_exchange_flags;
875}
876
28ce6054 877static struct nfs4_client *
a1bcecd2
AA		 878find_confirmed_client_by_str(const char *dname, unsigned int hashval,
879 bool use_exchange_id)
28ce6054
N		 880{
881 struct nfs4_client *clp;
882
883 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 884 if (same_name(clp->cl_recdir, dname) &&
885 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 886 return clp;
887 }
888 return NULL;
889}
890
891static struct nfs4_client *
a1bcecd2
AA		 892find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
893 bool use_exchange_id)
28ce6054
N		 894{
895 struct nfs4_client *clp;
896
897 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 898 if (same_name(clp->cl_recdir, dname) &&
899 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 900 return clp;
901 }
902 return NULL;
903}
904
1da177e4
LT		 905/* a helper function for parse_callback */
906static int
907parse_octet(unsigned int *lenp, char **addrp)
908{
909 unsigned int len = *lenp;
910 char *p = *addrp;
911 int n = -1;
912 char c;
913
914 for (;;) {
915 if (!len)
916 break;
917 len--;
918 c = *p++;
919 if (c == '.')
920 break;
921 if ((c < '0') || (c > '9')) {
922 n = -1;
923 break;
924 }
925 if (n < 0)
926 n = 0;
927 n = (n * 10) + (c - '0');
928 if (n > 255) {
929 n = -1;
930 break;
931 }
932 }
933 *lenp = len;
934 *addrp = p;
935 return n;
936}
937
938/* parse and set the setclientid ipv4 callback address */
fd39ca9a 939static int
1da177e4
LT		 940parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
941{
942 int temp = 0;
943 u32 cbaddr = 0;
944 u16 cbport = 0;
945 u32 addrlen = addr_len;
946 char *addr = addr_val;
947 int i, shift;
948
949 /* ipaddress */
950 shift = 24;
951 for(i = 4; i > 0 ; i--) {
952 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
953 return 0;
954 }
955 cbaddr |= (temp << shift);
956 if (shift > 0)
957 shift -= 8;
958 }
959 *cbaddrp = cbaddr;
960
961 /* port */
962 shift = 8;
963 for(i = 2; i > 0 ; i--) {
964 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
965 return 0;
966 }
967 cbport |= (temp << shift);
968 if (shift > 0)
969 shift -= 8;
970 }
971 *cbportp = cbport;
972 return 1;
973}
974
fd39ca9a 975static void
1da177e4
LT		 976gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
977{
c237dc03 978 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
1da177e4
LT		 979
980 /* Currently, we only support tcp for the callback channel */
981 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
982 goto out_err;
983
984 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
985 &cb->cb_addr, &cb->cb_port)))
986 goto out_err;
ab52ae6d 987 cb->cb_minorversion = 0;
1da177e4
LT		 988 cb->cb_prog = se->se_callback_prog;
989 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 990 return;
991out_err:
849823c5 992 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 993 "will not receive delegations\n",
994 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
995
1da177e4
LT		 996 return;
997}
998
074fe897
AA		 999void
1000nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
1001{
1002 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1003
1004 resp->cstate.statp = statp;
1005}
1006
1007/*
1008 * Dereference the result pages.
1009 */
1010static void
1011nfsd4_release_respages(struct page **respages, short resused)
1012{
1013 int i;
1014
1015 dprintk("--> %s\n", __func__);
1016 for (i = 0; i < resused; i++) {
1017 if (!respages[i])
1018 continue;
1019 put_page(respages[i]);
1020 respages[i] = NULL;
1021 }
1022}
1023
1024static void
1025nfsd4_copy_pages(struct page **topages, struct page **frompages, short count)
1026{
1027 int i;
1028
1029 for (i = 0; i < count; i++) {
1030 topages[i] = frompages[i];
1031 if (!topages[i])
1032 continue;
1033 get_page(topages[i]);
1034 }
1035}
1036
1037/*
1038 * Cache the reply pages up to NFSD_PAGES_PER_SLOT + 1, clearing the previous
1039 * pages. We add a page to NFSD_PAGES_PER_SLOT for the case where the total
1040 * length of the XDR response is less than se_fmaxresp_cached
1041 * (NFSD_PAGES_PER_SLOT * PAGE_SIZE) but the xdr_buf pages is used for a
1042 * of the reply (e.g. readdir).
1043 *
1044 * Store the base and length of the rq_req.head[0] page
1045 * of the NFSv4.1 data, just past the rpc header.
1046 */
1047void
1048nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1049{
1050 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1051 struct svc_rqst *rqstp = resp->rqstp;
1052 struct nfsd4_compoundargs *args = rqstp->rq_argp;
1053 struct nfsd4_op *op = &args->ops[resp->opcnt];
1054 struct kvec *resv = &rqstp->rq_res.head[0];
1055
1056 dprintk("--> %s entry %p\n", __func__, entry);
1057
1058 /* Don't cache a failed OP_SEQUENCE. */
1059 if (resp->opcnt == 1 && op->opnum == OP_SEQUENCE && resp->cstate.status)
1060 return;
bf864a31 1061
074fe897 1062 nfsd4_release_respages(entry->ce_respages, entry->ce_resused);
bf864a31
AA		 1063 entry->ce_opcnt = resp->opcnt;
1064 entry->ce_status = resp->cstate.status;
1065
1066 /*
1067 * Don't need a page to cache just the sequence operation - the slot
1068 * does this for us!
1069 */
1070
1071 if (nfsd4_not_cached(resp)) {
1072 entry->ce_resused = 0;
1073 entry->ce_rpchdrlen = 0;
1074 dprintk("%s Just cache SEQUENCE. ce_cachethis %d\n", __func__,
1075 resp->cstate.slot->sl_cache_entry.ce_cachethis);
1076 return;
1077 }
074fe897
AA		 1078 entry->ce_resused = rqstp->rq_resused;
1079 if (entry->ce_resused > NFSD_PAGES_PER_SLOT + 1)
1080 entry->ce_resused = NFSD_PAGES_PER_SLOT + 1;
1081 nfsd4_copy_pages(entry->ce_respages, rqstp->rq_respages,
1082 entry->ce_resused);
074fe897
AA		 1083 entry->ce_datav.iov_base = resp->cstate.statp;
1084 entry->ce_datav.iov_len = resv->iov_len - ((char *)resp->cstate.statp -
1085 (char *)page_address(rqstp->rq_respages[0]));
074fe897
AA		 1086 /* Current request rpc header length*/
1087 entry->ce_rpchdrlen = (char *)resp->cstate.statp -
1088 (char *)page_address(rqstp->rq_respages[0]);
1089}
1090
1091/*
1092 * We keep the rpc header, but take the nfs reply from the replycache.
1093 */
1094static int
1095nfsd41_copy_replay_data(struct nfsd4_compoundres *resp,
1096 struct nfsd4_cache_entry *entry)
1097{
1098 struct svc_rqst *rqstp = resp->rqstp;
1099 struct kvec *resv = &resp->rqstp->rq_res.head[0];
1100 int len;
1101
1102 /* Current request rpc header length*/
1103 len = (char *)resp->cstate.statp -
1104 (char *)page_address(rqstp->rq_respages[0]);
1105 if (entry->ce_datav.iov_len + len > PAGE_SIZE) {
1106 dprintk("%s v41 cached reply too large (%Zd).\n", __func__,
1107 entry->ce_datav.iov_len);
1108 return 0;
1109 }
1110 /* copy the cached reply nfsd data past the current rpc header */
1111 memcpy((char *)resv->iov_base + len, entry->ce_datav.iov_base,
1112 entry->ce_datav.iov_len);
1113 resv->iov_len = len + entry->ce_datav.iov_len;
1114 return 1;
1115}
1116
1117/*
1118 * Keep the first page of the replay. Copy the NFSv4.1 data from the first
1119 * cached page. Replace any futher replay pages from the cache.
1120 */
1121__be32
bf864a31
AA		 1122nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1123 struct nfsd4_sequence *seq)
074fe897
AA		 1124{
1125 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1126 __be32 status;
1127
1128 dprintk("--> %s entry %p\n", __func__, entry);
1129
bf864a31
AA		 1130 /*
1131 * If this is just the sequence operation, we did not keep
1132 * a page in the cache entry because we can just use the
1133 * slot info stored in struct nfsd4_sequence that was checked
1134 * against the slot in nfsd4_sequence().
1135 *
1136 * This occurs when seq->cachethis is FALSE, or when the client
1137 * session inactivity timer fires and a solo sequence operation
1138 * is sent (lease renewal).
1139 */
1140 if (seq && nfsd4_not_cached(resp)) {
6c18ba9f 1141 seq->maxslots = resp->cstate.session->se_fchannel.maxreqs;
bf864a31
AA		 1142 return nfs_ok;
1143 }
074fe897
AA		 1144
1145 if (!nfsd41_copy_replay_data(resp, entry)) {
1146 /*
1147 * Not enough room to use the replay rpc header, send the
1148 * cached header. Release all the allocated result pages.
1149 */
1150 svc_free_res_pages(resp->rqstp);
1151 nfsd4_copy_pages(resp->rqstp->rq_respages, entry->ce_respages,
1152 entry->ce_resused);
1153 } else {
1154 /* Release all but the first allocated result page */
1155
1156 resp->rqstp->rq_resused--;
1157 svc_free_res_pages(resp->rqstp);
1158
1159 nfsd4_copy_pages(&resp->rqstp->rq_respages[1],
1160 &entry->ce_respages[1],
1161 entry->ce_resused - 1);
1162 }
1163
1164 resp->rqstp->rq_resused = entry->ce_resused;
da3846a2
AA		 1165 resp->opcnt = entry->ce_opcnt;
1166 resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
074fe897
AA		 1167 status = entry->ce_status;
1168
1169 return status;
1170}
1171
0733d213
AA		 1172/*
1173 * Set the exchange_id flags returned by the server.
1174 */
1175static void
1176nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1177{
1178 /* pNFS is not supported */
1179 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1180
1181 /* Referrals are supported, Migration is not. */
1182 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1183
1184 /* set the wire flags to return to client. */
1185 clid->flags = new->cl_exchange_flags;
1186}
1187
069b6ad4
AA		 1188__be32
1189nfsd4_exchange_id(struct svc_rqst *rqstp,
1190 struct nfsd4_compound_state *cstate,
1191 struct nfsd4_exchange_id *exid)
1192{
0733d213
AA		 1193 struct nfs4_client *unconf, *conf, *new;
1194 int status;
1195 unsigned int strhashval;
1196 char dname[HEXDIR_LEN];
1197 nfs4_verifier verf = exid->verifier;
1198 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
1199
1200 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1201 " ip_addr=%u flags %x, spa_how %d\n",
1202 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1203 ip_addr, exid->flags, exid->spa_how);
1204
1205 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1206 return nfserr_inval;
1207
1208 /* Currently only support SP4_NONE */
1209 switch (exid->spa_how) {
1210 case SP4_NONE:
1211 break;
1212 case SP4_SSV:
1213 return nfserr_encr_alg_unsupp;
1214 default:
1215 BUG(); /* checked by xdr code */
1216 case SP4_MACH_CRED:
1217 return nfserr_serverfault; /* no excuse :-/ */
1218 }
1219
1220 status = nfs4_make_rec_clidname(dname, &exid->clname);
1221
1222 if (status)
1223 goto error;
1224
1225 strhashval = clientstr_hashval(dname);
1226
1227 nfs4_lock_state();
1228 status = nfs_ok;
1229
a1bcecd2 1230 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1231 if (conf) {
1232 if (!same_verf(&verf, &conf->cl_verifier)) {
1233 /* 18.35.4 case 8 */
1234 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1235 status = nfserr_not_same;
1236 goto out;
1237 }
1238 /* Client reboot: destroy old state */
1239 expire_client(conf);
1240 goto out_new;
1241 }
1242 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1243 /* 18.35.4 case 9 */
1244 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1245 status = nfserr_perm;
1246 goto out;
1247 }
1248 expire_client(conf);
1249 goto out_new;
1250 }
0733d213
AA		 1251 /*
1252 * Set bit when the owner id and verifier map to an already
1253 * confirmed client id (18.35.3).
1254 */
1255 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1256
1257 /*
1258 * Falling into 18.35.4 case 2, possible router replay.
1259 * Leave confirmed record intact and return same result.
1260 */
1261 copy_verf(conf, &verf);
1262 new = conf;
1263 goto out_copy;
6ddbbbfe
MS		 1264 }
1265
1266 /* 18.35.4 case 7 */
1267 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1268 status = nfserr_noent;
1269 goto out;
0733d213
AA		 1270 }
1271
a1bcecd2 1272 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1273 if (unconf) {
1274 /*
1275 * Possible retry or client restart. Per 18.35.4 case 4,
1276 * a new unconfirmed record should be generated regardless
1277 * of whether any properties have changed.
1278 */
1279 expire_client(unconf);
1280 }
1281
1282out_new:
1283 /* Normal case */
1284 new = create_client(exid->clname, dname);
1285 if (new == NULL) {
1286 status = nfserr_resource;
1287 goto out;
1288 }
1289
1290 copy_verf(new, &verf);
1291 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1292 new->cl_addr = ip_addr;
1293 gen_clid(new);
1294 gen_confirm(new);
1295 add_to_unconfirmed(new, strhashval);
1296out_copy:
1297 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1298 exid->clientid.cl_id = new->cl_clientid.cl_id;
1299
38eb76a5
AA		 1300 new->cl_slot.sl_seqid = 0;
1301 exid->seqid = 1;
0733d213
AA		 1302 nfsd4_set_ex_flags(new, exid);
1303
1304 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
38eb76a5 1305 new->cl_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1306 status = nfs_ok;
1307
1308out:
1309 nfs4_unlock_state();
1310error:
1311 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1312 return status;
069b6ad4
AA		 1313}
1314
b85d4c01
BH		 1315static int
1316check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
1317{
1318 dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
1319 slot->sl_seqid);
1320
1321 /* The slot is in use, and no response has been sent. */
1322 if (slot->sl_inuse) {
1323 if (seqid == slot->sl_seqid)
1324 return nfserr_jukebox;
1325 else
1326 return nfserr_seq_misordered;
1327 }
1328 /* Normal */
1329 if (likely(seqid == slot->sl_seqid + 1))
1330 return nfs_ok;
1331 /* Replay */
1332 if (seqid == slot->sl_seqid)
1333 return nfserr_replay_cache;
1334 /* Wraparound */
1335 if (seqid == 1 && (slot->sl_seqid + 1) == 0)
1336 return nfs_ok;
1337 /* Misordered replay or misordered new request */
1338 return nfserr_seq_misordered;
1339}
1340
069b6ad4
AA		 1341__be32
1342nfsd4_create_session(struct svc_rqst *rqstp,
1343 struct nfsd4_compound_state *cstate,
1344 struct nfsd4_create_session *cr_ses)
1345{
ec6b5d7b 1346 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
38eb76a5 1347 struct nfsd4_compoundres *resp = rqstp->rq_resp;
ec6b5d7b 1348 struct nfs4_client *conf, *unconf;
38eb76a5 1349 struct nfsd4_slot *slot = NULL;
ec6b5d7b
AA		 1350 int status = 0;
1351
1352 nfs4_lock_state();
1353 unconf = find_unconfirmed_client(&cr_ses->clientid);
1354 conf = find_confirmed_client(&cr_ses->clientid);
1355
1356 if (conf) {
38eb76a5
AA		 1357 slot = &conf->cl_slot;
1358 status = check_slot_seqid(cr_ses->seqid, slot);
1359 if (status == nfserr_replay_cache) {
ec6b5d7b 1360 dprintk("Got a create_session replay! seqid= %d\n",
38eb76a5
AA		 1361 slot->sl_seqid);
1362 cstate->slot = slot;
1363 cstate->status = status;
1364 /* Return the cached reply status */
bf864a31 1365 status = nfsd4_replay_cache_entry(resp, NULL);
38eb76a5
AA		 1366 goto out;
1367 } else if (cr_ses->seqid != conf->cl_slot.sl_seqid + 1) {
ec6b5d7b
AA		 1368 status = nfserr_seq_misordered;
1369 dprintk("Sequence misordered!\n");
1370 dprintk("Expected seqid= %d but got seqid= %d\n",
38eb76a5 1371 slot->sl_seqid, cr_ses->seqid);
ec6b5d7b
AA		 1372 goto out;
1373 }
38eb76a5 1374 conf->cl_slot.sl_seqid++;
ec6b5d7b
AA		 1375 } else if (unconf) {
1376 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1377 (ip_addr != unconf->cl_addr)) {
1378 status = nfserr_clid_inuse;
1379 goto out;
1380 }
1381
38eb76a5
AA		 1382 slot = &unconf->cl_slot;
1383 status = check_slot_seqid(cr_ses->seqid, slot);
1384 if (status) {
1385 /* an unconfirmed replay returns misordered */
ec6b5d7b
AA		 1386 status = nfserr_seq_misordered;
1387 goto out;
1388 }
1389
38eb76a5 1390 slot->sl_seqid++; /* from 0 to 1 */
ec6b5d7b
AA		 1391 move_to_confirmed(unconf);
1392
1393 /*
1394 * We do not support RDMA or persistent sessions
1395 */
1396 cr_ses->flags &= ~SESSION4_PERSIST;
1397 cr_ses->flags &= ~SESSION4_RDMA;
1398
1399 conf = unconf;
1400 } else {
1401 status = nfserr_stale_clientid;
1402 goto out;
1403 }
1404
1405 status = alloc_init_session(rqstp, conf, cr_ses);
1406 if (status)
1407 goto out;
1408
ec6b5d7b
AA		 1409 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1410 NFS4_MAX_SESSIONID_LEN);
38eb76a5 1411 cr_ses->seqid = slot->sl_seqid;
ec6b5d7b 1412
38eb76a5
AA		 1413 slot->sl_inuse = true;
1414 cstate->slot = slot;
bf864a31
AA		 1415 /* Ensure a page is used for the cache */
1416 slot->sl_cache_entry.ce_cachethis = 1;
ec6b5d7b
AA		 1417out:
1418 nfs4_unlock_state();
1419 dprintk("%s returns %d\n", __func__, ntohl(status));
1420 return status;
069b6ad4
AA		 1421}
1422
1423__be32
1424nfsd4_destroy_session(struct svc_rqst *r,
1425 struct nfsd4_compound_state *cstate,
1426 struct nfsd4_destroy_session *sessionid)
1427{
e10e0cfc
BH		 1428 struct nfsd4_session *ses;
1429 u32 status = nfserr_badsession;
1430
1431 /* Notes:
1432 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1433 * - Should we return nfserr_back_chan_busy if waiting for
1434 * callbacks on to-be-destroyed session?
1435 * - Do we need to clear any callback info from previous session?
1436 */
1437
1438 dump_sessionid(__func__, &sessionid->sessionid);
1439 spin_lock(&sessionid_lock);
1440 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1441 if (!ses) {
1442 spin_unlock(&sessionid_lock);
1443 goto out;
1444 }
1445
1446 unhash_session(ses);
1447 spin_unlock(&sessionid_lock);
1448
1449 /* wait for callbacks */
1450 shutdown_callback_client(ses->se_client);
1451 nfsd4_put_session(ses);
1452 status = nfs_ok;
1453out:
1454 dprintk("%s returns %d\n", __func__, ntohl(status));
1455 return status;
069b6ad4
AA		 1456}
1457
1458__be32
b85d4c01 1459nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1460 struct nfsd4_compound_state *cstate,
1461 struct nfsd4_sequence *seq)
1462{
f9bb94c4 1463 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1464 struct nfsd4_session *session;
1465 struct nfsd4_slot *slot;
1466 int status;
1467
f9bb94c4
AA		 1468 if (resp->opcnt != 1)
1469 return nfserr_sequence_pos;
1470
b85d4c01
BH		 1471 spin_lock(&sessionid_lock);
1472 status = nfserr_badsession;
1473 session = find_in_sessionid_hashtbl(&seq->sessionid);
1474 if (!session)
1475 goto out;
1476
1477 status = nfserr_badslot;
6c18ba9f 1478 if (seq->slotid >= session->se_fchannel.maxreqs)
b85d4c01
BH		 1479 goto out;
1480
1481 slot = &session->se_slots[seq->slotid];
1482 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1483
1484 status = check_slot_seqid(seq->seqid, slot);
1485 if (status == nfserr_replay_cache) {
1486 cstate->slot = slot;
1487 cstate->session = session;
da3846a2 1488 /* Return the cached reply status and set cstate->status
bf864a31
AA		 1489 * for nfsd4_svc_encode_compoundres processing */
1490 status = nfsd4_replay_cache_entry(resp, seq);
da3846a2 1491 cstate->status = nfserr_replay_cache;
b85d4c01
BH		 1492 goto replay_cache;
1493 }
1494 if (status)
1495 goto out;
1496
1497 /* Success! bump slot seqid */
1498 slot->sl_inuse = true;
1499 slot->sl_seqid = seq->seqid;
bf864a31
AA		 1500 slot->sl_cache_entry.ce_cachethis = seq->cachethis;
1501 /* Always set the cache entry cachethis for solo sequence */
1502 if (nfsd4_is_solo_sequence(resp))
1503 slot->sl_cache_entry.ce_cachethis = 1;
b85d4c01
BH		 1504
1505 cstate->slot = slot;
1506 cstate->session = session;
1507
1508replay_cache:
1509 /* Renew the clientid on success and on replay.
1510 * Hold a session reference until done processing the compound:
1511 * nfsd4_put_session called only if the cstate slot is set.
1512 */
1513 renew_client(session->se_client);
1514 nfsd4_get_session(session);
1515out:
1516 spin_unlock(&sessionid_lock);
1517 dprintk("%s: return %d\n", __func__, ntohl(status));
1518 return status;
069b6ad4
AA		 1519}
1520
b37ad28b 1521__be32
b591480b
BF		 1522nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1523 struct nfsd4_setclientid *setclid)
1da177e4 1524{
27459f09 1525 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1526 struct xdr_netobj clname = {
1527 .len = setclid->se_namelen,
1528 .data = setclid->se_name,
1529 };
1530 nfs4_verifier clverifier = setclid->se_verf;
1531 unsigned int strhashval;
28ce6054 1532 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1533 __be32 status;
68e76ad0 1534 char *princ;
a55370a3 1535 char dname[HEXDIR_LEN];
1da177e4 1536
1da177e4 1537 if (!check_name(clname))
73aea4ec 1538 return nfserr_inval;
1da177e4 1539
a55370a3
N		 1540 status = nfs4_make_rec_clidname(dname, &clname);
1541 if (status)
73aea4ec 1542 return status;
a55370a3 1543
1da177e4
LT		 1544 /*
1545 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1546 * We get here on a DRC miss.
1547 */
1548
a55370a3 1549 strhashval = clientstr_hashval(dname);
1da177e4 1550
1da177e4 1551 nfs4_lock_state();
a1bcecd2 1552 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1553 if (conf) {
a186e767 1554 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1555 status = nfserr_clid_inuse;
026722c2
BF		 1556 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1557 dprintk("NFSD: setclientid: string in use by client"
1558 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1559 goto out;
1560 }
1da177e4 1561 }
a186e767
BF		 1562 /*
1563 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1564 * has a description of SETCLIENTID request processing consisting
1565 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1566 */
a1bcecd2 1567 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1568 status = nfserr_resource;
1569 if (!conf) {
a186e767
BF		 1570 /*
1571 * RFC 3530 14.2.33 CASE 4:
1572 * placed first, because it is the normal case
1da177e4
LT		 1573 */
1574 if (unconf)
1575 expire_client(unconf);
a55370a3
N		 1576 new = create_client(clname, dname);
1577 if (new == NULL)
1da177e4 1578 goto out;
1da177e4 1579 gen_clid(new);
599e0a22 1580 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1581 /*
a186e767
BF		 1582 * RFC 3530 14.2.33 CASE 1:
1583 * probable callback update
1da177e4 1584 */
31f4a6c1
N		 1585 if (unconf) {
1586 /* Note this is removing unconfirmed {*x***},
1587 * which is stronger than RFC recommended {vxc**}.
1588 * This has the advantage that there is at most
1589 * one {*x***} in either list at any time.
1590 */
1591 expire_client(unconf);
1da177e4 1592 }
a55370a3
N		 1593 new = create_client(clname, dname);
1594 if (new == NULL)
1da177e4 1595 goto out;
1da177e4 1596 copy_clid(new, conf);
1da177e4
LT		 1597 } else if (!unconf) {
1598 /*
a186e767
BF		 1599 * RFC 3530 14.2.33 CASE 2:
1600 * probable client reboot; state will be removed if
1601 * confirmed.
1da177e4 1602 */
a55370a3
N		 1603 new = create_client(clname, dname);
1604 if (new == NULL)
1da177e4 1605 goto out;
1da177e4 1606 gen_clid(new);
49ba8781 1607 } else {
a186e767
BF		 1608 /*
1609 * RFC 3530 14.2.33 CASE 3:
1610 * probable client reboot; state will be removed if
1611 * confirmed.
1da177e4
LT		 1612 */
1613 expire_client(unconf);
a55370a3
N		 1614 new = create_client(clname, dname);
1615 if (new == NULL)
1da177e4 1616 goto out;
1da177e4 1617 gen_clid(new);
1da177e4 1618 }
c175b83c
BF		 1619 copy_verf(new, &clverifier);
1620 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1621 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1622 princ = svc_gss_principal(rqstp);
1623 if (princ) {
1624 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1625 if (new->cl_principal == NULL) {
1626 free_client(new);
1627 goto out;
1628 }
1629 }
c175b83c
BF		 1630 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1631 gen_confirm(new);
1632 gen_callback(new, setclid);
1633 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1634 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1635 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1636 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1637 status = nfs_ok;
1638out:
1639 nfs4_unlock_state();
1640 return status;
1641}
1642
1643
1644/*
a186e767
BF		 1645 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1646 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1647 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1648 */
b37ad28b 1649__be32
b591480b
BF		 1650nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1651 struct nfsd4_compound_state *cstate,
1652 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1653{
27459f09 1654 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1655 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1656 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1657 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1658 __be32 status;
1da177e4
LT		 1659
1660 if (STALE_CLIENTID(clid))
1661 return nfserr_stale_clientid;
1662 /*
1663 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1664 * We get here on a DRC miss.
1665 */
1666
1667 nfs4_lock_state();
21ab45a4
N		 1668
1669 conf = find_confirmed_client(clid);
1670 unconf = find_unconfirmed_client(clid);
1671
1672 status = nfserr_clid_inuse;
27459f09 1673 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1674 goto out;
27459f09 1675 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1676 goto out;
1677
a186e767
BF		 1678 /*
1679 * section 14.2.34 of RFC 3530 has a description of
1680 * SETCLIENTID_CONFIRM request processing consisting
1681 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1682 */
366e0c1d 1683 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1684 /*
1685 * RFC 3530 14.2.34 CASE 1:
1686 * callback update
1687 */
599e0a22 1688 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1689 status = nfserr_clid_inuse;
1690 else {
1a69c179
N		 1691 /* XXX: We just turn off callbacks until we can handle
1692 * change request correctly. */
c237dc03 1693 atomic_set(&conf->cl_cb_conn.cb_set, 0);
1a69c179 1694 expire_client(unconf);
1da177e4 1695 status = nfs_ok;
1a69c179 1696
1da177e4 1697 }
f3aba4e5 1698 } else if (conf && !unconf) {
a186e767
BF		 1699 /*
1700 * RFC 3530 14.2.34 CASE 2:
1701 * probable retransmitted request; play it safe and
1702 * do nothing.
7c79f737 1703 */
599e0a22 1704 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1705 status = nfserr_clid_inuse;
21ab45a4 1706 else
1da177e4 1707 status = nfs_ok;
7c79f737 1708 } else if (!conf && unconf
599e0a22 1709 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1710 /*
1711 * RFC 3530 14.2.34 CASE 3:
1712 * Normal case; new or rebooted client:
7c79f737 1713 */
599e0a22 1714 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1715 status = nfserr_clid_inuse;
1716 } else {
1a69c179
N		 1717 unsigned int hash =
1718 clientstr_hashval(unconf->cl_recdir);
1719 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1720 hash, false);
1a69c179 1721 if (conf) {
c7b9a459 1722 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1723 expire_client(conf);
1724 }
1da177e4 1725 move_to_confirmed(unconf);
21ab45a4 1726 conf = unconf;
46f8a64b 1727 nfsd4_probe_callback(conf);
1a69c179 1728 status = nfs_ok;
1da177e4 1729 }
599e0a22
BF		 1730 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1731 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1732 &confirm)))) {
a186e767
BF		 1733 /*
1734 * RFC 3530 14.2.34 CASE 4:
1735 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1736 */
1da177e4 1737 status = nfserr_stale_clientid;
7c79f737 1738 } else {
08e8987c
N		 1739 /* check that we have hit one of the cases...*/
1740 status = nfserr_clid_inuse;
1741 }
1da177e4 1742out:
1da177e4
LT		 1743 nfs4_unlock_state();
1744 return status;
1745}
1746
1da177e4
LT		 1747/* OPEN Share state helper functions */
1748static inline struct nfs4_file *
1749alloc_init_file(struct inode *ino)
1750{
1751 struct nfs4_file *fp;
1752 unsigned int hashval = file_hashval(ino);
1753
e60d4398
N		 1754 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1755 if (fp) {
8b671b80 1756 atomic_set(&fp->fi_ref, 1);
1da177e4 1757 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1758 INIT_LIST_HEAD(&fp->fi_stateids);
1759 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1760 spin_lock(&recall_lock);
1da177e4 1761 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1762 spin_unlock(&recall_lock);
1da177e4
LT		 1763 fp->fi_inode = igrab(ino);
1764 fp->fi_id = current_fileid++;
47f9940c 1765 fp->fi_had_conflict = false;
1da177e4
LT		 1766 return fp;
1767 }
1768 return NULL;
1769}
1770
e60d4398 1771static void
e18b890b 1772nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1773{
e60d4398
N		 1774 if (*slab == NULL)
1775 return;
1a1d92c1 1776 kmem_cache_destroy(*slab);
e60d4398 1777 *slab = NULL;
1da177e4
LT		 1778}
1779
e8ff2a84 1780void
1da177e4
LT		 1781nfsd4_free_slabs(void)
1782{
e60d4398
N		 1783 nfsd4_free_slab(&stateowner_slab);
1784 nfsd4_free_slab(&file_slab);
5ac049ac 1785 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1786 nfsd4_free_slab(&deleg_slab);
e60d4398 1787}
1da177e4 1788
e60d4398
N		 1789static int
1790nfsd4_init_slabs(void)
1791{
1792 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1793 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1794 if (stateowner_slab == NULL)
1795 goto out_nomem;
1796 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1797 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1798 if (file_slab == NULL)
1799 goto out_nomem;
5ac049ac 1800 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1801 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1802 if (stateid_slab == NULL)
1803 goto out_nomem;
5b2d21c1 1804 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1805 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1806 if (deleg_slab == NULL)
1807 goto out_nomem;
e60d4398
N		 1808 return 0;
1809out_nomem:
1810 nfsd4_free_slabs();
1811 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1812 return -ENOMEM;
1da177e4
LT		 1813}
1814
1815void
1816nfs4_free_stateowner(struct kref *kref)
1817{
1818 struct nfs4_stateowner *sop =
1819 container_of(kref, struct nfs4_stateowner, so_ref);
1820 kfree(sop->so_owner.data);
1821 kmem_cache_free(stateowner_slab, sop);
1822}
1823
1824static inline struct nfs4_stateowner *
1825alloc_stateowner(struct xdr_netobj *owner)
1826{
1827 struct nfs4_stateowner *sop;
1828
1829 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1830 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1831 memcpy(sop->so_owner.data, owner->data, owner->len);
1832 sop->so_owner.len = owner->len;
1833 kref_init(&sop->so_ref);
1834 return sop;
1835 }
1836 kmem_cache_free(stateowner_slab, sop);
1837 }
1838 return NULL;
1839}
1840
1841static struct nfs4_stateowner *
1842alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1843 struct nfs4_stateowner *sop;
1844 struct nfs4_replay *rp;
1845 unsigned int idhashval;
1846
1847 if (!(sop = alloc_stateowner(&open->op_owner)))
1848 return NULL;
1849 idhashval = ownerid_hashval(current_ownerid);
1850 INIT_LIST_HEAD(&sop->so_idhash);
1851 INIT_LIST_HEAD(&sop->so_strhash);
1852 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1853 INIT_LIST_HEAD(&sop->so_stateids);
1854 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1855 INIT_LIST_HEAD(&sop->so_close_lru);
1856 sop->so_time = 0;
1857 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1858 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1859 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1860 sop->so_is_open_owner = 1;
1861 sop->so_id = current_ownerid++;
1862 sop->so_client = clp;
1863 sop->so_seqid = open->op_seqid;
1864 sop->so_confirmed = 0;
1865 rp = &sop->so_replay;
de1ae286 1866 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1867 rp->rp_buflen = 0;
1868 rp->rp_buf = rp->rp_ibuf;
1869 return sop;
1870}
1871
1da177e4
LT		 1872static inline void
1873init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1874 struct nfs4_stateowner *sop = open->op_stateowner;
1875 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1876
1877 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1878 INIT_LIST_HEAD(&stp->st_perstateowner);
1879 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1880 INIT_LIST_HEAD(&stp->st_perfile);
1881 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1882 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1883 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1884 stp->st_stateowner = sop;
13cd2184 1885 get_nfs4_file(fp);
1da177e4 1886 stp->st_file = fp;
78155ed7 1887 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 1888 stp->st_stateid.si_stateownerid = sop->so_id;
1889 stp->st_stateid.si_fileid = fp->fi_id;
1890 stp->st_stateid.si_generation = 0;
1891 stp->st_access_bmap = 0;
1892 stp->st_deny_bmap = 0;
84459a11
AA		 1893 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
1894 &stp->st_access_bmap);
1da177e4 1895 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1896 stp->st_openstp = NULL;
1da177e4
LT		 1897}
1898
fd39ca9a 1899static void
1da177e4
LT		 1900move_to_close_lru(struct nfs4_stateowner *sop)
1901{
1902 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1903
358dd55a 1904 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1905 sop->so_time = get_seconds();
1906}
1907
1da177e4 1908static int
599e0a22
BF		 1909same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1910 clientid_t *clid)
1911{
1912 return (sop->so_owner.len == owner->len) &&
1913 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1914 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1915}
1916
1917static struct nfs4_stateowner *
1918find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1919{
1920 struct nfs4_stateowner *so = NULL;
1921
1922 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1923 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1924 return so;
1925 }
1926 return NULL;
1927}
1928
1929/* search file_hashtbl[] for file */
1930static struct nfs4_file *
1931find_file(struct inode *ino)
1932{
1933 unsigned int hashval = file_hashval(ino);
1934 struct nfs4_file *fp;
1935
8b671b80 1936 spin_lock(&recall_lock);
1da177e4 1937 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1938 if (fp->fi_inode == ino) {
1939 get_nfs4_file(fp);
8b671b80 1940 spin_unlock(&recall_lock);
1da177e4 1941 return fp;
13cd2184 1942 }
1da177e4 1943 }
8b671b80 1944 spin_unlock(&recall_lock);
1da177e4
LT		 1945 return NULL;
1946}
1947
d87a8ade 1948static inline int access_valid(u32 x, u32 minorversion)
ba5a6a19 1949{
d87a8ade 1950 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
8838dc43 1951 return 0;
d87a8ade
AA		 1952 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
1953 return 0;
1954 x &= ~NFS4_SHARE_ACCESS_MASK;
1955 if (minorversion && x) {
1956 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
1957 return 0;
1958 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
1959 return 0;
1960 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
1961 }
1962 if (x)
8838dc43
BF		 1963 return 0;
1964 return 1;
ba5a6a19
BF		 1965}
1966
8838dc43 1967static inline int deny_valid(u32 x)
ba5a6a19 1968{
8838dc43
BF		 1969 /* Note: unlike access bits, deny bits may be zero. */
1970 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1971}
1da177e4 1972
4f83aa30
BF		 1973/*
1974 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1975 * st_{access,deny}_bmap field of the stateid, in order to track not
1976 * only what share bits are currently in force, but also what
1977 * combinations of share bits previous opens have used. This allows us
1978 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1979 * return an error if the client attempt to downgrade to a combination
1980 * of share bits not explicable by closing some of its previous opens.
1981 *
1982 * XXX: This enforcement is actually incomplete, since we don't keep
1983 * track of access/deny bit combinations; so, e.g., we allow:
1984 *
1985 * OPEN allow read, deny write
1986 * OPEN allow both, deny none
1987 * DOWNGRADE allow read, deny none
1988 *
1989 * which we should reject.
1990 */
fd39ca9a 1991static void
1da177e4
LT		 1992set_access(unsigned int *access, unsigned long bmap) {
1993 int i;
1994
1995 *access = 0;
1996 for (i = 1; i < 4; i++) {
1997 if (test_bit(i, &bmap))
1998 *access |= i;
1999 }
2000}
2001
fd39ca9a 2002static void
1da177e4
LT		 2003set_deny(unsigned int *deny, unsigned long bmap) {
2004 int i;
2005
2006 *deny = 0;
2007 for (i = 0; i < 4; i++) {
2008 if (test_bit(i, &bmap))
2009 *deny |= i ;
2010 }
2011}
2012
2013static int
2014test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
2015 unsigned int access, deny;
2016
2017 set_access(&access, stp->st_access_bmap);
2018 set_deny(&deny, stp->st_deny_bmap);
2019 if ((access & open->op_share_deny) || (deny & open->op_share_access))
2020 return 0;
2021 return 1;
2022}
2023
2024/*
2025 * Called to check deny when READ with all zero stateid or
2026 * WRITE with all zero or all one stateid
2027 */
b37ad28b 2028static __be32
1da177e4
LT		 2029nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2030{
2031 struct inode *ino = current_fh->fh_dentry->d_inode;
2032 struct nfs4_file *fp;
2033 struct nfs4_stateid *stp;
b37ad28b 2034 __be32 ret;
1da177e4
LT		 2035
2036 dprintk("NFSD: nfs4_share_conflict\n");
2037
2038 fp = find_file(ino);
13cd2184
N		 2039 if (!fp)
2040 return nfs_ok;
b700949b 2041 ret = nfserr_locked;
1da177e4 2042 /* Search for conflicting share reservations */
13cd2184
N		 2043 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2044 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2045 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2046 goto out;
1da177e4 2047 }
13cd2184
N		 2048 ret = nfs_ok;
2049out:
2050 put_nfs4_file(fp);
2051 return ret;
1da177e4
LT		 2052}
2053
2054static inline void
2055nfs4_file_downgrade(struct file *filp, unsigned int share_access)
2056{
2057 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 2058 drop_file_write_access(filp);
1da177e4
LT		 2059 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
2060 }
2061}
2062
1da177e4
LT		 2063/*
2064 * Spawn a thread to perform a recall on the delegation represented
2065 * by the lease (file_lock)
2066 *
2067 * Called from break_lease() with lock_kernel() held.
2068 * Note: we assume break_lease will only call this *once* for any given
2069 * lease.
2070 */
2071static
2072void nfsd_break_deleg_cb(struct file_lock *fl)
2073{
63e4863f 2074 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1da177e4
LT		 2075
2076 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2077 if (!dp)
2078 return;
2079
2080 /* We're assuming the state code never drops its reference
2081 * without first removing the lease. Since we're in this lease
2082 * callback (and since the lease code is serialized by the kernel
2083 * lock) we know the server hasn't removed the lease yet, we know
2084 * it's safe to take a reference: */
2085 atomic_inc(&dp->dl_count);
cfdcad4d 2086 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 2087
2088 spin_lock(&recall_lock);
2089 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2090 spin_unlock(&recall_lock);
2091
2092 /* only place dl_time is set. protected by lock_kernel*/
2093 dp->dl_time = get_seconds();
2094
0272e1fd
BF		 2095 /*
2096 * We don't want the locks code to timeout the lease for us;
2097 * we'll remove it ourself if the delegation isn't returned
2098 * in time.
2099 */
2100 fl->fl_break_time = 0;
1da177e4 2101
63e4863f
BF		 2102 dp->dl_file->fi_had_conflict = true;
2103 nfsd4_cb_recall(dp);
1da177e4
LT		 2104}
2105
2106/*
2107 * The file_lock is being reapd.
2108 *
2109 * Called by locks_free_lock() with lock_kernel() held.
2110 */
2111static
2112void nfsd_release_deleg_cb(struct file_lock *fl)
2113{
2114 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2115
2116 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2117
2118 if (!(fl->fl_flags & FL_LEASE) || !dp)
2119 return;
2120 dp->dl_flock = NULL;
2121}
2122
2123/*
2124 * Set the delegation file_lock back pointer.
2125 *
a9933cea 2126 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 2127 */
2128static
2129void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2130{
2131 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2132
2133 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2134 if (!dp)
2135 return;
2136 dp->dl_flock = new;
2137}
2138
2139/*
a9933cea 2140 * Called from setlease() with lock_kernel() held
1da177e4
LT		 2141 */
2142static
2143int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2144{
2145 struct nfs4_delegation *onlistd =
2146 (struct nfs4_delegation *)onlist->fl_owner;
2147 struct nfs4_delegation *tryd =
2148 (struct nfs4_delegation *)try->fl_owner;
2149
2150 if (onlist->fl_lmops != try->fl_lmops)
2151 return 0;
2152
2153 return onlistd->dl_client == tryd->dl_client;
2154}
2155
2156
2157static
2158int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2159{
2160 if (arg & F_UNLCK)
2161 return lease_modify(onlist, arg);
2162 else
2163 return -EAGAIN;
2164}
2165
fd39ca9a 2166static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 2167 .fl_break = nfsd_break_deleg_cb,
2168 .fl_release_private = nfsd_release_deleg_cb,
2169 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2170 .fl_mylease = nfsd_same_client_deleg_cb,
2171 .fl_change = nfsd_change_deleg_cb,
2172};
2173
2174
b37ad28b 2175__be32
6668958f
AA		 2176nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2177 struct nfsd4_open *open)
1da177e4 2178{
1da177e4
LT		 2179 clientid_t *clientid = &open->op_clientid;
2180 struct nfs4_client *clp = NULL;
2181 unsigned int strhashval;
2182 struct nfs4_stateowner *sop = NULL;
2183
1da177e4 2184 if (!check_name(open->op_owner))
0f442aa2 2185 return nfserr_inval;
1da177e4
LT		 2186
2187 if (STALE_CLIENTID(&open->op_clientid))
2188 return nfserr_stale_clientid;
2189
2190 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2191 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 2192 open->op_stateowner = sop;
2193 if (!sop) {
2194 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 2195 clp = find_confirmed_client(clientid);
2196 if (clp == NULL)
0f442aa2
BF		 2197 return nfserr_expired;
2198 goto renew;
1da177e4 2199 }
6668958f
AA		 2200 /* When sessions are used, skip open sequenceid processing */
2201 if (nfsd4_has_session(cstate))
2202 goto renew;
0f442aa2
BF		 2203 if (!sop->so_confirmed) {
2204 /* Replace unconfirmed owners without checking for replay. */
2205 clp = sop->so_client;
f044ff83 2206 release_openowner(sop);
0f442aa2
BF		 2207 open->op_stateowner = NULL;
2208 goto renew;
2209 }
2210 if (open->op_seqid == sop->so_seqid - 1) {
2211 if (sop->so_replay.rp_buflen)
a90b061c 2212 return nfserr_replay_me;
0f442aa2
BF		 2213 /* The original OPEN failed so spectacularly
2214 * that we don't even have replay data saved!
2215 * Therefore, we have no choice but to continue
2216 * processing this OPEN; presumably, we'll
2217 * fail again for the same reason.
2218 */
2219 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2220 goto renew;
2221 }
2222 if (open->op_seqid != sop->so_seqid)
2223 return nfserr_bad_seqid;
1da177e4 2224renew:
0f442aa2
BF		 2225 if (open->op_stateowner == NULL) {
2226 sop = alloc_init_open_stateowner(strhashval, clp, open);
2227 if (sop == NULL)
2228 return nfserr_resource;
2229 open->op_stateowner = sop;
2230 }
2231 list_del_init(&sop->so_close_lru);
1da177e4 2232 renew_client(sop->so_client);
0f442aa2 2233 return nfs_ok;
1da177e4
LT		 2234}
2235
b37ad28b 2236static inline __be32
4a6e43e6
N		 2237nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2238{
2239 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2240 return nfserr_openmode;
2241 else
2242 return nfs_ok;
2243}
2244
52f4fb43
N		 2245static struct nfs4_delegation *
2246find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2247{
2248 struct nfs4_delegation *dp;
2249
ea1da636 2250 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 2251 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2252 return dp;
2253 }
2254 return NULL;
2255}
2256
b37ad28b 2257static __be32
567d9829
N		 2258nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2259 struct nfs4_delegation **dp)
2260{
2261 int flags;
b37ad28b 2262 __be32 status = nfserr_bad_stateid;
567d9829
N		 2263
2264 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2265 if (*dp == NULL)
c44c5eeb 2266 goto out;
567d9829
N		 2267 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2268 RD_STATE : WR_STATE;
2269 status = nfs4_check_delegmode(*dp, flags);
2270 if (status)
2271 *dp = NULL;
c44c5eeb
N		 2272out:
2273 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2274 return nfs_ok;
2275 if (status)
2276 return status;
2277 open->op_stateowner->so_confirmed = 1;
2278 return nfs_ok;
567d9829
N		 2279}
2280
b37ad28b 2281static __be32
1da177e4
LT		 2282nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2283{
2284 struct nfs4_stateid *local;
b37ad28b 2285 __be32 status = nfserr_share_denied;
1da177e4
LT		 2286 struct nfs4_stateowner *sop = open->op_stateowner;
2287
8beefa24 2288 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2289 /* ignore lock owners */
2290 if (local->st_stateowner->so_is_open_owner == 0)
2291 continue;
2292 /* remember if we have seen this open owner */
2293 if (local->st_stateowner == sop)
2294 *stpp = local;
2295 /* check for conflicting share reservations */
2296 if (!test_share(local, open))
2297 goto out;
2298 }
2299 status = 0;
2300out:
2301 return status;
2302}
2303
5ac049ac
N		 2304static inline struct nfs4_stateid *
2305nfs4_alloc_stateid(void)
2306{
2307 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2308}
2309
b37ad28b 2310static __be32
1da177e4 2311nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 2312 struct nfs4_delegation *dp,
1da177e4
LT		 2313 struct svc_fh *cur_fh, int flags)
2314{
2315 struct nfs4_stateid *stp;
1da177e4 2316
5ac049ac 2317 stp = nfs4_alloc_stateid();
1da177e4
LT		 2318 if (stp == NULL)
2319 return nfserr_resource;
2320
567d9829
N		 2321 if (dp) {
2322 get_file(dp->dl_vfs_file);
2323 stp->st_vfs_file = dp->dl_vfs_file;
2324 } else {
b37ad28b 2325 __be32 status;
567d9829
N		 2326 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2327 &stp->st_vfs_file);
2328 if (status) {
2329 if (status == nfserr_dropit)
2330 status = nfserr_jukebox;
5ac049ac 2331 kmem_cache_free(stateid_slab, stp);
567d9829
N		 2332 return status;
2333 }
1da177e4 2334 }
1da177e4
LT		 2335 *stpp = stp;
2336 return 0;
2337}
2338
b37ad28b 2339static inline __be32
1da177e4
LT		 2340nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2341 struct nfsd4_open *open)
2342{
2343 struct iattr iattr = {
2344 .ia_valid = ATTR_SIZE,
2345 .ia_size = 0,
2346 };
2347 if (!open->op_truncate)
2348 return 0;
2349 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2350 return nfserr_inval;
1da177e4
LT		 2351 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2352}
2353
b37ad28b 2354static __be32
1da177e4
LT		 2355nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2356{
2357 struct file *filp = stp->st_vfs_file;
7eaa36e2 2358 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 2359 unsigned int share_access, new_writer;
b37ad28b 2360 __be32 status;
1da177e4
LT		 2361
2362 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 2363 new_writer = (~share_access) & open->op_share_access
2364 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 2365
6c26d08f 2366 if (new_writer) {
b37ad28b
AV		 2367 int err = get_write_access(inode);
2368 if (err)
2369 return nfserrno(err);
e518f056
BH		 2370 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2371 if (err)
2372 return nfserrno(err);
2373 file_take_write(filp);
6c26d08f 2374 }
1da177e4
LT		 2375 status = nfsd4_truncate(rqstp, cur_fh, open);
2376 if (status) {
6c26d08f
BF		 2377 if (new_writer)
2378 put_write_access(inode);
1da177e4
LT		 2379 return status;
2380 }
2381 /* remember the open */
6c26d08f 2382 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 2383 __set_bit(open->op_share_access, &stp->st_access_bmap);
2384 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 2385
2386 return nfs_ok;
2387}
2388
2389
1da177e4 2390static void
37515177 2391nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 2392{
37515177
N		 2393 open->op_stateowner->so_confirmed = 1;
2394 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 2395}
2396
2397/*
2398 * Attempt to hand out a delegation.
2399 */
2400static void
2401nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2402{
2403 struct nfs4_delegation *dp;
2404 struct nfs4_stateowner *sop = stp->st_stateowner;
c237dc03 2405 struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
1da177e4
LT		 2406 struct file_lock fl, *flp = &fl;
2407 int status, flag = 0;
2408
2409 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2410 open->op_recall = 0;
2411 switch (open->op_claim_type) {
2412 case NFS4_OPEN_CLAIM_PREVIOUS:
2413 if (!atomic_read(&cb->cb_set))
2414 open->op_recall = 1;
2415 flag = open->op_delegate_type;
2416 if (flag == NFS4_OPEN_DELEGATE_NONE)
2417 goto out;
2418 break;
2419 case NFS4_OPEN_CLAIM_NULL:
2420 /* Let's not give out any delegations till everyone's
2421 * had the chance to reclaim theirs.... */
af558e33 2422 if (locks_in_grace())
7b190fec
N		 2423 goto out;
2424 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2425 goto out;
2426 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2427 flag = NFS4_OPEN_DELEGATE_WRITE;
2428 else
2429 flag = NFS4_OPEN_DELEGATE_READ;
2430 break;
2431 default:
2432 goto out;
2433 }
1da177e4
LT		 2434
2435 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2436 if (dp == NULL) {
2437 flag = NFS4_OPEN_DELEGATE_NONE;
2438 goto out;
2439 }
2440 locks_init_lock(&fl);
2441 fl.fl_lmops = &nfsd_lease_mng_ops;
2442 fl.fl_flags = FL_LEASE;
9167f501 2443 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2444 fl.fl_end = OFFSET_MAX;
2445 fl.fl_owner = (fl_owner_t)dp;
2446 fl.fl_file = stp->st_vfs_file;
2447 fl.fl_pid = current->tgid;
2448
a9933cea 2449 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2450 * the lock_manager callbacks fl_mylease and fl_change are used
2451 */
9167f501 2452 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2453 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2454 unhash_delegation(dp);
1da177e4
LT		 2455 flag = NFS4_OPEN_DELEGATE_NONE;
2456 goto out;
2457 }
2458
2459 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2460
2461 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2462 dp->dl_stateid.si_boot,
2463 dp->dl_stateid.si_stateownerid,
2464 dp->dl_stateid.si_fileid,
2465 dp->dl_stateid.si_generation);
2466out:
7b190fec
N		 2467 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2468 && flag == NFS4_OPEN_DELEGATE_NONE
2469 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2470 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2471 open->op_delegate_type = flag;
2472}
2473
2474/*
2475 * called with nfs4_lock_state() held.
2476 */
b37ad28b 2477__be32
1da177e4
LT		 2478nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2479{
6668958f 2480 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1da177e4
LT		 2481 struct nfs4_file *fp = NULL;
2482 struct inode *ino = current_fh->fh_dentry->d_inode;
2483 struct nfs4_stateid *stp = NULL;
567d9829 2484 struct nfs4_delegation *dp = NULL;
b37ad28b 2485 __be32 status;
1da177e4
LT		 2486
2487 status = nfserr_inval;
d87a8ade 2488 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
ba5a6a19 2489 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2490 goto out;
2491 /*
2492 * Lookup file; if found, lookup stateid and check open request,
2493 * and check for delegations in the process of being recalled.
2494 * If not found, create the nfs4_file struct
2495 */
2496 fp = find_file(ino);
2497 if (fp) {
2498 if ((status = nfs4_check_open(fp, open, &stp)))
2499 goto out;
c44c5eeb
N		 2500 status = nfs4_check_deleg(fp, open, &dp);
2501 if (status)
2502 goto out;
1da177e4 2503 } else {
c44c5eeb
N		 2504 status = nfserr_bad_stateid;
2505 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2506 goto out;
1da177e4
LT		 2507 status = nfserr_resource;
2508 fp = alloc_init_file(ino);
2509 if (fp == NULL)
2510 goto out;
2511 }
2512
2513 /*
2514 * OPEN the file, or upgrade an existing OPEN.
2515 * If truncate fails, the OPEN fails.
2516 */
2517 if (stp) {
2518 /* Stateid was found, this is an OPEN upgrade */
2519 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2520 if (status)
2521 goto out;
444c2c07 2522 update_stateid(&stp->st_stateid);
1da177e4
LT		 2523 } else {
2524 /* Stateid was not found, this is a new OPEN */
2525 int flags = 0;
9ecb6a08 2526 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2527 flags |= NFSD_MAY_READ;
1da177e4 2528 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2529 flags |= NFSD_MAY_WRITE;
567d9829
N		 2530 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2531 if (status)
1da177e4
LT		 2532 goto out;
2533 init_stateid(stp, fp, open);
2534 status = nfsd4_truncate(rqstp, current_fh, open);
2535 if (status) {
2283963f 2536 release_open_stateid(stp);
1da177e4
LT		 2537 goto out;
2538 }
6668958f
AA		 2539 if (nfsd4_has_session(&resp->cstate))
2540 update_stateid(&stp->st_stateid);
1da177e4
LT		 2541 }
2542 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2543
6668958f
AA		 2544 if (nfsd4_has_session(&resp->cstate))
2545 open->op_stateowner->so_confirmed = 1;
2546
1da177e4
LT		 2547 /*
2548 * Attempt to hand out a delegation. No error return, because the
2549 * OPEN succeeds even if we fail.
2550 */
2551 nfs4_open_delegation(current_fh, open, stp);
2552
2553 status = nfs_ok;
2554
2555 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2556 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2557 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2558out:
13cd2184
N		 2559 if (fp)
2560 put_nfs4_file(fp);
37515177
N		 2561 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2562 nfs4_set_claim_prev(open);
1da177e4
LT		 2563 /*
2564 * To finish the open response, we just need to set the rflags.
2565 */
2566 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6668958f
AA		 2567 if (!open->op_stateowner->so_confirmed &&
2568 !nfsd4_has_session(&resp->cstate))
1da177e4
LT		 2569 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2570
2571 return status;
2572}
2573
b37ad28b 2574__be32
b591480b
BF		 2575nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2576 clientid_t *clid)
1da177e4
LT		 2577{
2578 struct nfs4_client *clp;
b37ad28b 2579 __be32 status;
1da177e4
LT		 2580
2581 nfs4_lock_state();
2582 dprintk("process_renew(%08x/%08x): starting\n",
2583 clid->cl_boot, clid->cl_id);
2584 status = nfserr_stale_clientid;
2585 if (STALE_CLIENTID(clid))
2586 goto out;
2587 clp = find_confirmed_client(clid);
2588 status = nfserr_expired;
2589 if (clp == NULL) {
2590 /* We assume the client took too long to RENEW. */
2591 dprintk("nfsd4_renew: clientid not found!\n");
2592 goto out;
2593 }
2594 renew_client(clp);
2595 status = nfserr_cb_path_down;
ea1da636 2596 if (!list_empty(&clp->cl_delegations)
c237dc03 2597 && !atomic_read(&clp->cl_cb_conn.cb_set))
1da177e4
LT		 2598 goto out;
2599 status = nfs_ok;
2600out:
2601 nfs4_unlock_state();
2602 return status;
2603}
2604
af558e33
BF		 2605struct lock_manager nfsd4_manager = {
2606};
2607
a76b4319 2608static void
af558e33 2609nfsd4_end_grace(void)
a76b4319
N		 2610{
2611 dprintk("NFSD: end of grace period\n");
c7b9a459 2612 nfsd4_recdir_purge_old();
af558e33 2613 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2614}
2615
fd39ca9a 2616static time_t
1da177e4
LT		 2617nfs4_laundromat(void)
2618{
2619 struct nfs4_client *clp;
2620 struct nfs4_stateowner *sop;
2621 struct nfs4_delegation *dp;
2622 struct list_head *pos, *next, reaplist;
2623 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2624 time_t t, clientid_val = NFSD_LEASE_TIME;
2625 time_t u, test_val = NFSD_LEASE_TIME;
2626
2627 nfs4_lock_state();
2628
2629 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2630 if (locks_in_grace())
2631 nfsd4_end_grace();
1da177e4
LT		 2632 list_for_each_safe(pos, next, &client_lru) {
2633 clp = list_entry(pos, struct nfs4_client, cl_lru);
2634 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2635 t = clp->cl_time - cutoff;
2636 if (clientid_val > t)
2637 clientid_val = t;
2638 break;
2639 }
2640 dprintk("NFSD: purging unused client (clientid %08x)\n",
2641 clp->cl_clientid.cl_id);
c7b9a459 2642 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2643 expire_client(clp);
2644 }
2645 INIT_LIST_HEAD(&reaplist);
2646 spin_lock(&recall_lock);
2647 list_for_each_safe(pos, next, &del_recall_lru) {
2648 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2649 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2650 u = dp->dl_time - cutoff;
2651 if (test_val > u)
2652 test_val = u;
2653 break;
2654 }
2655 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2656 dp, dp->dl_flock);
2657 list_move(&dp->dl_recall_lru, &reaplist);
2658 }
2659 spin_unlock(&recall_lock);
2660 list_for_each_safe(pos, next, &reaplist) {
2661 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2662 list_del_init(&dp->dl_recall_lru);
2663 unhash_delegation(dp);
2664 }
2665 test_val = NFSD_LEASE_TIME;
2666 list_for_each_safe(pos, next, &close_lru) {
2667 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2668 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2669 u = sop->so_time - cutoff;
2670 if (test_val > u)
2671 test_val = u;
2672 break;
2673 }
2674 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2675 sop->so_id);
f044ff83 2676 release_openowner(sop);
1da177e4
LT		 2677 }
2678 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2679 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2680 nfs4_unlock_state();
2681 return clientid_val;
2682}
2683
a254b246
HH		 2684static struct workqueue_struct *laundry_wq;
2685static void laundromat_main(struct work_struct *);
2686static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2687
2688static void
c4028958 2689laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2690{
2691 time_t t;
2692
2693 t = nfs4_laundromat();
2694 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2695 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2696}
2697
fd39ca9a 2698static struct nfs4_stateowner *
f8816512
N		 2699search_close_lru(u32 st_id, int flags)
2700{
1da177e4
LT		 2701 struct nfs4_stateowner *local = NULL;
2702
1da177e4
LT		 2703 if (flags & CLOSE_STATE) {
2704 list_for_each_entry(local, &close_lru, so_close_lru) {
2705 if (local->so_id == st_id)
2706 return local;
2707 }
2708 }
2709 return NULL;
2710}
2711
2712static inline int
2713nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2714{
7eaa36e2 2715 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2716}
2717
2718static int
2719STALE_STATEID(stateid_t *stateid)
2720{
78155ed7
BN		 2721 if (time_after((unsigned long)boot_time,
2722 (unsigned long)stateid->si_boot)) {
2723 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2724 stateid->si_boot, stateid->si_stateownerid,
2725 stateid->si_fileid, stateid->si_generation);
2726 return 1;
2727 }
2728 return 0;
2729}
2730
2731static int
2732EXPIRED_STATEID(stateid_t *stateid)
2733{
2734 if (time_before((unsigned long)boot_time,
2735 ((unsigned long)stateid->si_boot)) &&
b8fd47ae 2736 time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) {
78155ed7
BN		 2737 dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
2738 stateid->si_boot, stateid->si_stateownerid,
2739 stateid->si_fileid, stateid->si_generation);
2740 return 1;
2741 }
2742 return 0;
2743}
2744
2745static __be32
2746stateid_error_map(stateid_t *stateid)
2747{
2748 if (STALE_STATEID(stateid))
2749 return nfserr_stale_stateid;
2750 if (EXPIRED_STATEID(stateid))
2751 return nfserr_expired;
2752
2753 dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
2754 stateid->si_boot, stateid->si_stateownerid,
2755 stateid->si_fileid, stateid->si_generation);
2756 return nfserr_bad_stateid;
1da177e4
LT		 2757}
2758
2759static inline int
2760access_permit_read(unsigned long access_bmap)
2761{
2762 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2763 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2764 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2765}
2766
2767static inline int
2768access_permit_write(unsigned long access_bmap)
2769{
2770 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2771 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2772}
2773
2774static
b37ad28b 2775__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2776{
b37ad28b 2777 __be32 status = nfserr_openmode;
1da177e4
LT		 2778
2779 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2780 goto out;
2781 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2782 goto out;
2783 status = nfs_ok;
2784out:
2785 return status;
2786}
2787
b37ad28b 2788static inline __be32
1da177e4
LT		 2789check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2790{
203a8c8e 2791 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2792 return nfs_ok;
af558e33 2793 else if (locks_in_grace()) {
1da177e4
LT		 2794 /* Answer in remaining cases depends on existance of
2795 * conflicting state; so we must wait out the grace period. */
2796 return nfserr_grace;
2797 } else if (flags & WR_STATE)
2798 return nfs4_share_conflict(current_fh,
2799 NFS4_SHARE_DENY_WRITE);
2800 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2801 return nfs4_share_conflict(current_fh,
2802 NFS4_SHARE_DENY_READ);
2803}
2804
2805/*
2806 * Allow READ/WRITE during grace period on recovered state only for files
2807 * that are not able to provide mandatory locking.
2808 */
2809static inline int
18f82731 2810grace_disallows_io(struct inode *inode)
1da177e4 2811{
203a8c8e 2812 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2813}
2814
6668958f 2815static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
0836f587 2816{
6668958f
AA		 2817 /*
2818 * When sessions are used the stateid generation number is ignored
2819 * when it is zero.
2820 */
2821 if ((flags & HAS_SESSION) && in->si_generation == 0)
2822 goto out;
2823
0836f587
BF		 2824 /* If the client sends us a stateid from the future, it's buggy: */
2825 if (in->si_generation > ref->si_generation)
2826 return nfserr_bad_stateid;
2827 /*
2828 * The following, however, can happen. For example, if the
2829 * client sends an open and some IO at the same time, the open
2830 * may bump si_generation while the IO is still in flight.
2831 * Thanks to hard links and renames, the client never knows what
2832 * file an open will affect. So it could avoid that situation
2833 * only by serializing all opens and IO from the same open
2834 * owner. To recover from the old_stateid error, the client
2835 * will just have to retry the IO:
2836 */
2837 if (in->si_generation < ref->si_generation)
2838 return nfserr_old_stateid;
6668958f 2839out:
0836f587
BF		 2840 return nfs_ok;
2841}
2842
3e633079
BF		 2843static int is_delegation_stateid(stateid_t *stateid)
2844{
2845 return stateid->si_fileid == 0;
2846}
2847
1da177e4
LT		 2848/*
2849* Checks for stateid operations
2850*/
b37ad28b 2851__be32
dd453dfd
BH		 2852nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2853 stateid_t *stateid, int flags, struct file **filpp)
1da177e4
LT		 2854{
2855 struct nfs4_stateid *stp = NULL;
2856 struct nfs4_delegation *dp = NULL;
dd453dfd 2857 struct svc_fh *current_fh = &cstate->current_fh;
1da177e4 2858 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2859 __be32 status;
1da177e4 2860
1da177e4
LT		 2861 if (filpp)
2862 *filpp = NULL;
2863
18f82731 2864 if (grace_disallows_io(ino))
1da177e4
LT		 2865 return nfserr_grace;
2866
6668958f
AA		 2867 if (nfsd4_has_session(cstate))
2868 flags |= HAS_SESSION;
2869
1da177e4
LT		 2870 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2871 return check_special_stateids(current_fh, stateid, flags);
2872
1da177e4
LT		 2873 status = nfserr_stale_stateid;
2874 if (STALE_STATEID(stateid))
2875 goto out;
2876
1da177e4 2877 status = nfserr_bad_stateid;
3e633079 2878 if (is_delegation_stateid(stateid)) {
a4455be0 2879 dp = find_delegation_stateid(ino, stateid);
78155ed7
BN		 2880 if (!dp) {
2881 status = stateid_error_map(stateid);
1da177e4 2882 goto out;
78155ed7 2883 }
6668958f
AA		 2884 status = check_stateid_generation(stateid, &dp->dl_stateid,
2885 flags);
0c2a498f
BF		 2886 if (status)
2887 goto out;
dc9bf700
BF		 2888 status = nfs4_check_delegmode(dp, flags);
2889 if (status)
2890 goto out;
2891 renew_client(dp->dl_client);
dc9bf700
BF		 2892 if (filpp)
2893 *filpp = dp->dl_vfs_file;
1da177e4 2894 } else { /* open or lock stateid */
a4455be0 2895 stp = find_stateid(stateid, flags);
78155ed7
BN		 2896 if (!stp) {
2897 status = stateid_error_map(stateid);
1da177e4 2898 goto out;
78155ed7 2899 }
6150ef0d 2900 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2901 goto out;
2902 if (!stp->st_stateowner->so_confirmed)
2903 goto out;
6668958f
AA		 2904 status = check_stateid_generation(stateid, &stp->st_stateid,
2905 flags);
0c2a498f
BF		 2906 if (status)
2907 goto out;
a4455be0
BF		 2908 status = nfs4_check_openmode(stp, flags);
2909 if (status)
1da177e4
LT		 2910 goto out;
2911 renew_client(stp->st_stateowner->so_client);
2912 if (filpp)
2913 *filpp = stp->st_vfs_file;
1da177e4
LT		 2914 }
2915 status = nfs_ok;
2916out:
2917 return status;
2918}
2919
4c4cd222
N		 2920static inline int
2921setlkflg (int type)
2922{
2923 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2924 RD_STATE : WR_STATE;
2925}
1da177e4
LT		 2926
2927/*
2928 * Checks for sequence id mutating operations.
2929 */
b37ad28b 2930static __be32
dd453dfd
BH		 2931nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2932 stateid_t *stateid, int flags,
2933 struct nfs4_stateowner **sopp,
2934 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2935{
1da177e4
LT		 2936 struct nfs4_stateid *stp;
2937 struct nfs4_stateowner *sop;
dd453dfd 2938 struct svc_fh *current_fh = &cstate->current_fh;
0836f587 2939 __be32 status;
1da177e4
LT		 2940
2941 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2942 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2943 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2944 stateid->si_generation);
3a4f98bb 2945
1da177e4
LT		 2946 *stpp = NULL;
2947 *sopp = NULL;
2948
1da177e4 2949 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2950 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2951 return nfserr_bad_stateid;
1da177e4
LT		 2952 }
2953
1da177e4 2954 if (STALE_STATEID(stateid))
3a4f98bb 2955 return nfserr_stale_stateid;
6668958f
AA		 2956
2957 if (nfsd4_has_session(cstate))
2958 flags |= HAS_SESSION;
2959
1da177e4
LT		 2960 /*
2961 * We return BAD_STATEID if filehandle doesn't match stateid,
2962 * the confirmed flag is incorrecly set, or the generation
2963 * number is incorrect.
1da177e4 2964 */
f8816512
N		 2965 stp = find_stateid(stateid, flags);
2966 if (stp == NULL) {
2967 /*
2968 * Also, we should make sure this isn't just the result of
2969 * a replayed close:
2970 */
2971 sop = search_close_lru(stateid->si_stateownerid, flags);
2972 if (sop == NULL)
78155ed7 2973 return stateid_error_map(stateid);
f8816512
N		 2974 *sopp = sop;
2975 goto check_replay;
2976 }
1da177e4 2977
39325bd0
BF		 2978 *stpp = stp;
2979 *sopp = sop = stp->st_stateowner;
2980
4c4cd222 2981 if (lock) {
4c4cd222 2982 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2983 struct nfs4_client *clp = sop->so_client;
4c4cd222 2984 int lkflg = 0;
b37ad28b 2985 __be32 status;
4c4cd222
N		 2986
2987 lkflg = setlkflg(lock->lk_type);
2988
2989 if (lock->lk_is_new) {
599e0a22
BF		 2990 if (!sop->so_is_open_owner)
2991 return nfserr_bad_stateid;
60adfc50
AA		 2992 if (!(flags & HAS_SESSION) &&
2993 !same_clid(&clp->cl_clientid, lockclid))
2994 return nfserr_bad_stateid;
599e0a22
BF		 2995 /* stp is the open stateid */
2996 status = nfs4_check_openmode(stp, lkflg);
2997 if (status)
2998 return status;
2999 } else {
3000 /* stp is the lock stateid */
3001 status = nfs4_check_openmode(stp->st_openstp, lkflg);
3002 if (status)
3003 return status;
4c4cd222 3004 }
1da177e4
LT		 3005 }
3006
f3362737 3007 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 3008 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 3009 return nfserr_bad_stateid;
1da177e4
LT		 3010 }
3011
1da177e4
LT		 3012 /*
3013 * We now validate the seqid and stateid generation numbers.
3014 * For the moment, we ignore the possibility of
3015 * generation number wraparound.
3016 */
6668958f 3017 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
1da177e4
LT		 3018 goto check_replay;
3019
3a4f98bb 3020 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 3021 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 3022 " unconfirmed stateowner!\n");
3023 return nfserr_bad_stateid;
1da177e4 3024 }
3a4f98bb 3025 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 3026 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 3027 " confirmed yet!\n");
3028 return nfserr_bad_stateid;
1da177e4 3029 }
6668958f 3030 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
0836f587
BF		 3031 if (status)
3032 return status;
52fd004e 3033 renew_client(sop->so_client);
3a4f98bb 3034 return nfs_ok;
1da177e4 3035
1da177e4 3036check_replay:
bd9aac52 3037 if (seqid == sop->so_seqid - 1) {
849823c5 3038 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 3039 /* indicate replay to calling function */
a90b061c 3040 return nfserr_replay_me;
1da177e4 3041 }
2fdada03 3042 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 3043 sop->so_seqid, seqid);
3044 *sopp = NULL;
3045 return nfserr_bad_seqid;
1da177e4
LT		 3046}
3047
b37ad28b 3048__be32
ca364317 3049nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3050 struct nfsd4_open_confirm *oc)
1da177e4 3051{
b37ad28b 3052 __be32 status;
1da177e4
LT		 3053 struct nfs4_stateowner *sop;
3054 struct nfs4_stateid *stp;
3055
3056 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 3057 (int)cstate->current_fh.fh_dentry->d_name.len,
3058 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3059
ca364317 3060 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 3061 if (status)
3062 return status;
1da177e4
LT		 3063
3064 nfs4_lock_state();
3065
dd453dfd 3066 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3067 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 3068 CONFIRM | OPEN_STATE,
1da177e4
LT		 3069 &oc->oc_stateowner, &stp, NULL)))
3070 goto out;
3071
3072 sop = oc->oc_stateowner;
3073 sop->so_confirmed = 1;
3074 update_stateid(&stp->st_stateid);
3075 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3076 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
3077 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
3078 stp->st_stateid.si_boot,
3079 stp->st_stateid.si_stateownerid,
3080 stp->st_stateid.si_fileid,
3081 stp->st_stateid.si_generation);
c7b9a459
N		 3082
3083 nfsd4_create_clid_dir(sop->so_client);
1da177e4 3084out:
f2327d9a 3085 if (oc->oc_stateowner) {
1da177e4 3086 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 3087 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 3088 }
1da177e4
LT		 3089 nfs4_unlock_state();
3090 return status;
3091}
3092
3093
3094/*
3095 * unset all bits in union bitmap (bmap) that
3096 * do not exist in share (from successful OPEN_DOWNGRADE)
3097 */
3098static void
3099reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3100{
3101 int i;
3102 for (i = 1; i < 4; i++) {
3103 if ((i & access) != i)
3104 __clear_bit(i, bmap);
3105 }
3106}
3107
3108static void
3109reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3110{
3111 int i;
3112 for (i = 0; i < 4; i++) {
3113 if ((i & deny) != i)
3114 __clear_bit(i, bmap);
3115 }
3116}
3117
b37ad28b 3118__be32
ca364317
BF		 3119nfsd4_open_downgrade(struct svc_rqst *rqstp,
3120 struct nfsd4_compound_state *cstate,
a4f1706a 3121 struct nfsd4_open_downgrade *od)
1da177e4 3122{
b37ad28b 3123 __be32 status;
1da177e4
LT		 3124 struct nfs4_stateid *stp;
3125 unsigned int share_access;
3126
3127 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3128 (int)cstate->current_fh.fh_dentry->d_name.len,
3129 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3130
d87a8ade 3131 if (!access_valid(od->od_share_access, cstate->minorversion)
ba5a6a19 3132 || !deny_valid(od->od_share_deny))
1da177e4
LT		 3133 return nfserr_inval;
3134
3135 nfs4_lock_state();
dd453dfd 3136 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3137 od->od_seqid,
1da177e4 3138 &od->od_stateid,
f3362737 3139 OPEN_STATE,
1da177e4
LT		 3140 &od->od_stateowner, &stp, NULL)))
3141 goto out;
3142
3143 status = nfserr_inval;
3144 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3145 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3146 stp->st_access_bmap, od->od_share_access);
3147 goto out;
3148 }
3149 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3150 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3151 stp->st_deny_bmap, od->od_share_deny);
3152 goto out;
3153 }
3154 set_access(&share_access, stp->st_access_bmap);
3155 nfs4_file_downgrade(stp->st_vfs_file,
3156 share_access & ~od->od_share_access);
3157
3158 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3159 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3160
3161 update_stateid(&stp->st_stateid);
3162 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3163 status = nfs_ok;
3164out:
f2327d9a 3165 if (od->od_stateowner) {
1da177e4 3166 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 3167 cstate->replay_owner = od->od_stateowner;
f2327d9a 3168 }
1da177e4
LT		 3169 nfs4_unlock_state();
3170 return status;
3171}
3172
3173/*
3174 * nfs4_unlock_state() called after encode
3175 */
b37ad28b 3176__be32
ca364317 3177nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3178 struct nfsd4_close *close)
1da177e4 3179{
b37ad28b 3180 __be32 status;
1da177e4
LT		 3181 struct nfs4_stateid *stp;
3182
3183 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3184 (int)cstate->current_fh.fh_dentry->d_name.len,
3185 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3186
3187 nfs4_lock_state();
3188 /* check close_lru for replay */
dd453dfd 3189 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3190 close->cl_seqid,
1da177e4 3191 &close->cl_stateid,
f3362737 3192 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 3193 &close->cl_stateowner, &stp, NULL)))
3194 goto out;
1da177e4
LT		 3195 status = nfs_ok;
3196 update_stateid(&stp->st_stateid);
3197 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3198
04ef5954 3199 /* release_stateid() calls nfsd_close() if needed */
2283963f 3200 release_open_stateid(stp);
04ef5954
BF		 3201
3202 /* place unused nfs4_stateowners on so_close_lru list to be
3203 * released by the laundromat service after the lease period
3204 * to enable us to handle CLOSE replay
3205 */
3206 if (list_empty(&close->cl_stateowner->so_stateids))
3207 move_to_close_lru(close->cl_stateowner);
1da177e4 3208out:
f2327d9a 3209 if (close->cl_stateowner) {
1da177e4 3210 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 3211 cstate->replay_owner = close->cl_stateowner;
f2327d9a 3212 }
1da177e4
LT		 3213 nfs4_unlock_state();
3214 return status;
3215}
3216
b37ad28b 3217__be32
ca364317
BF		 3218nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3219 struct nfsd4_delegreturn *dr)
1da177e4 3220{
203a8c8e
BF		 3221 struct nfs4_delegation *dp;
3222 stateid_t *stateid = &dr->dr_stateid;
3223 struct inode *inode;
b37ad28b 3224 __be32 status;
6668958f 3225 int flags = 0;
1da177e4 3226
ca364317 3227 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3228 return status;
3229 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4 3230
6668958f
AA		 3231 if (nfsd4_has_session(cstate))
3232 flags |= HAS_SESSION;
1da177e4 3233 nfs4_lock_state();
203a8c8e
BF		 3234 status = nfserr_bad_stateid;
3235 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3236 goto out;
3237 status = nfserr_stale_stateid;
3238 if (STALE_STATEID(stateid))
3239 goto out;
7e0f7cf5 3240 status = nfserr_bad_stateid;
203a8c8e
BF		 3241 if (!is_delegation_stateid(stateid))
3242 goto out;
203a8c8e 3243 dp = find_delegation_stateid(inode, stateid);
78155ed7
BN		 3244 if (!dp) {
3245 status = stateid_error_map(stateid);
203a8c8e 3246 goto out;
78155ed7 3247 }
6668958f 3248 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
203a8c8e
BF		 3249 if (status)
3250 goto out;
3251 renew_client(dp->dl_client);
3252
3253 unhash_delegation(dp);
1da177e4 3254out:
203a8c8e
BF		 3255 nfs4_unlock_state();
3256
1da177e4
LT		 3257 return status;
3258}
3259
3260
3261/*
3262 * Lock owner state (byte-range locks)
3263 */
3264#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3265#define LOCK_HASH_BITS 8
3266#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3267#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3268
87df4de8
BH		 3269static inline u64
3270end_offset(u64 start, u64 len)
3271{
3272 u64 end;
3273
3274 end = start + len;
3275 return end >= start ? end: NFS4_MAX_UINT64;
3276}
3277
3278/* last octet in a range */
3279static inline u64
3280last_byte_offset(u64 start, u64 len)
3281{
3282 u64 end;
3283
3284 BUG_ON(!len);
3285 end = start + len;
3286 return end > start ? end - 1: NFS4_MAX_UINT64;
3287}
3288
1da177e4
LT		 3289#define lockownerid_hashval(id) \
3290 ((id) & LOCK_HASH_MASK)
3291
3292static inline unsigned int
3293lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3294 struct xdr_netobj *ownername)
3295{
3296 return (file_hashval(inode) + cl_id
3297 + opaque_hashval(ownername->data, ownername->len))
3298 & LOCK_HASH_MASK;
3299}
3300
3301static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3302static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3303static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3304
fd39ca9a 3305static struct nfs4_stateid *
1da177e4
LT		 3306find_stateid(stateid_t *stid, int flags)
3307{
9346eff0 3308 struct nfs4_stateid *local;
1da177e4
LT		 3309 u32 st_id = stid->si_stateownerid;
3310 u32 f_id = stid->si_fileid;
3311 unsigned int hashval;
3312
3313 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 3314 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3315 hashval = stateid_hashval(st_id, f_id);
3316 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3317 if ((local->st_stateid.si_stateownerid == st_id) &&
3318 (local->st_stateid.si_fileid == f_id))
3319 return local;
3320 }
3321 }
9346eff0
KK		 3322
3323 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3324 hashval = stateid_hashval(st_id, f_id);
3325 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3326 if ((local->st_stateid.si_stateownerid == st_id) &&
3327 (local->st_stateid.si_fileid == f_id))
3328 return local;
3329 }
849823c5 3330 }
1da177e4
LT		 3331 return NULL;
3332}
3333
3334static struct nfs4_delegation *
3335find_delegation_stateid(struct inode *ino, stateid_t *stid)
3336{
13cd2184
N		 3337 struct nfs4_file *fp;
3338 struct nfs4_delegation *dl;
1da177e4
LT		 3339
3340 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
3341 stid->si_boot, stid->si_stateownerid,
3342 stid->si_fileid, stid->si_generation);
3343
1da177e4 3344 fp = find_file(ino);
13cd2184
N		 3345 if (!fp)
3346 return NULL;
3347 dl = find_delegation_file(fp, stid);
3348 put_nfs4_file(fp);
3349 return dl;
1da177e4
LT		 3350}
3351
3352/*
3353 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3354 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3355 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3356 * locking, this prevents us from being completely protocol-compliant. The
3357 * real solution to this problem is to start using unsigned file offsets in
3358 * the VFS, but this is a very deep change!
3359 */
3360static inline void
3361nfs4_transform_lock_offset(struct file_lock *lock)
3362{
3363 if (lock->fl_start < 0)
3364 lock->fl_start = OFFSET_MAX;
3365 if (lock->fl_end < 0)
3366 lock->fl_end = OFFSET_MAX;
3367}
3368
d5b9026a
N		 3369/* Hack!: For now, we're defining this just so we can use a pointer to it
3370 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 3371static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3372};
1da177e4
LT		 3373
3374static inline void
3375nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3376{
d5b9026a
N		 3377 struct nfs4_stateowner *sop;
3378 unsigned int hval;
1da177e4 3379
d5b9026a
N		 3380 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3381 sop = (struct nfs4_stateowner *) fl->fl_owner;
3382 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 3383 kref_get(&sop->so_ref);
3384 deny->ld_sop = sop;
3385 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 3386 } else {
3387 deny->ld_sop = NULL;
3388 deny->ld_clientid.cl_boot = 0;
3389 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3390 }
3391 deny->ld_start = fl->fl_start;
87df4de8
BH		 3392 deny->ld_length = NFS4_MAX_UINT64;
3393 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3394 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3395 deny->ld_type = NFS4_READ_LT;
3396 if (fl->fl_type != F_RDLCK)
3397 deny->ld_type = NFS4_WRITE_LT;
3398}
3399
1da177e4
LT		 3400static struct nfs4_stateowner *
3401find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3402 struct xdr_netobj *owner)
3403{
3404 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3405 struct nfs4_stateowner *op;
3406
3407 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 3408 if (same_owner_str(op, owner, clid))
1da177e4
LT		 3409 return op;
3410 }
3411 return NULL;
3412}
3413
3414/*
3415 * Alloc a lock owner structure.
3416 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3417 * occured.
3418 *
3419 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 3420 */
3421
3422static struct nfs4_stateowner *
3423alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3424 struct nfs4_stateowner *sop;
3425 struct nfs4_replay *rp;
3426 unsigned int idhashval;
3427
3428 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3429 return NULL;
3430 idhashval = lockownerid_hashval(current_ownerid);
3431 INIT_LIST_HEAD(&sop->so_idhash);
3432 INIT_LIST_HEAD(&sop->so_strhash);
3433 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 3434 INIT_LIST_HEAD(&sop->so_stateids);
3435 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 3436 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3437 sop->so_time = 0;
3438 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3439 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 3440 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 3441 sop->so_is_open_owner = 0;
3442 sop->so_id = current_ownerid++;
3443 sop->so_client = clp;
b59e3c0e
NB		 3444 /* It is the openowner seqid that will be incremented in encode in the
3445 * case of new lockowners; so increment the lock seqid manually: */
3446 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 3447 sop->so_confirmed = 1;
3448 rp = &sop->so_replay;
de1ae286 3449 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 3450 rp->rp_buflen = 0;
3451 rp->rp_buf = rp->rp_ibuf;
3452 return sop;
3453}
3454
fd39ca9a 3455static struct nfs4_stateid *
1da177e4
LT		 3456alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3457{
3458 struct nfs4_stateid *stp;
3459 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3460
5ac049ac
N		 3461 stp = nfs4_alloc_stateid();
3462 if (stp == NULL)
1da177e4
LT		 3463 goto out;
3464 INIT_LIST_HEAD(&stp->st_hash);
3465 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 3466 INIT_LIST_HEAD(&stp->st_perstateowner);
3467 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 3468 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 3469 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 3470 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 3471 stp->st_stateowner = sop;
13cd2184 3472 get_nfs4_file(fp);
1da177e4 3473 stp->st_file = fp;
78155ed7 3474 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 3475 stp->st_stateid.si_stateownerid = sop->so_id;
3476 stp->st_stateid.si_fileid = fp->fi_id;
3477 stp->st_stateid.si_generation = 0;
3478 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3479 stp->st_access_bmap = open_stp->st_access_bmap;
3480 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3481 stp->st_openstp = open_stp;
1da177e4
LT		 3482
3483out:
3484 return stp;
3485}
3486
fd39ca9a 3487static int
1da177e4
LT		 3488check_lock_length(u64 offset, u64 length)
3489{
87df4de8 3490 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3491 LOFF_OVERFLOW(offset, length)));
3492}
3493
3494/*
3495 * LOCK operation
3496 */
b37ad28b 3497__be32
ca364317 3498nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3499 struct nfsd4_lock *lock)
1da177e4 3500{
3e9e3dbe 3501 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3502 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3503 struct nfs4_stateid *lock_stp;
3504 struct file *filp;
3505 struct file_lock file_lock;
8dc7c311 3506 struct file_lock conflock;
b37ad28b 3507 __be32 status = 0;
1da177e4 3508 unsigned int strhashval;
150b3934 3509 unsigned int cmd;
b8dd7b9a 3510 int err;
1da177e4
LT		 3511
3512 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3513 (long long) lock->lk_offset,
3514 (long long) lock->lk_length);
3515
1da177e4
LT		 3516 if (check_lock_length(lock->lk_offset, lock->lk_length))
3517 return nfserr_inval;
3518
ca364317 3519 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3520 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3521 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3522 return status;
3523 }
3524
1da177e4
LT		 3525 nfs4_lock_state();
3526
3527 if (lock->lk_is_new) {
893f8770
N		 3528 /*
3529 * Client indicates that this is a new lockowner.
3530 * Use open owner and open stateid to create lock owner and
3531 * lock stateid.
3532 */
1da177e4
LT		 3533 struct nfs4_stateid *open_stp = NULL;
3534 struct nfs4_file *fp;
3535
3536 status = nfserr_stale_clientid;
60adfc50
AA		 3537 if (!nfsd4_has_session(cstate) &&
3538 STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3539 goto out;
1da177e4 3540
1da177e4 3541 /* validate and update open stateid and open seqid */
dd453dfd 3542 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3543 lock->lk_new_open_seqid,
3544 &lock->lk_new_open_stateid,
f3362737 3545 OPEN_STATE,
3a65588a 3546 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3547 lock);
37515177 3548 if (status)
1da177e4 3549 goto out;
3a65588a 3550 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3551 /* create lockowner and lock stateid */
3552 fp = open_stp->st_file;
3553 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3554 open_sop->so_client->cl_clientid.cl_id,
3555 &lock->v.new.owner);
3e9e3dbe
N		 3556 /* XXX: Do we need to check for duplicate stateowners on
3557 * the same file, or should they just be allowed (and
3558 * create new stateids)? */
1da177e4 3559 status = nfserr_resource;
b59e3c0e
NB		 3560 lock_sop = alloc_init_lock_stateowner(strhashval,
3561 open_sop->so_client, open_stp, lock);
3562 if (lock_sop == NULL)
1da177e4 3563 goto out;
b59e3c0e 3564 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3565 if (lock_stp == NULL)
1da177e4 3566 goto out;
1da177e4
LT		 3567 } else {
3568 /* lock (lock owner + lock stateid) already exists */
dd453dfd 3569 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3570 lock->lk_old_lock_seqid,
3571 &lock->lk_old_lock_stateid,
f3362737 3572 LOCK_STATE,
3a65588a 3573 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3574 if (status)
3575 goto out;
3a65588a 3576 lock_sop = lock->lk_replay_owner;
1da177e4 3577 }
3a65588a 3578 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3579 filp = lock_stp->st_vfs_file;
3580
0dd395dc 3581 status = nfserr_grace;
af558e33 3582 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3583 goto out;
3584 status = nfserr_no_grace;
af558e33 3585 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3586 goto out;
3587
1da177e4
LT		 3588 locks_init_lock(&file_lock);
3589 switch (lock->lk_type) {
3590 case NFS4_READ_LT:
3591 case NFS4_READW_LT:
3592 file_lock.fl_type = F_RDLCK;
150b3934 3593 cmd = F_SETLK;
1da177e4
LT		 3594 break;
3595 case NFS4_WRITE_LT:
3596 case NFS4_WRITEW_LT:
3597 file_lock.fl_type = F_WRLCK;
150b3934 3598 cmd = F_SETLK;
1da177e4
LT		 3599 break;
3600 default:
3601 status = nfserr_inval;
3602 goto out;
3603 }
b59e3c0e 3604 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3605 file_lock.fl_pid = current->tgid;
3606 file_lock.fl_file = filp;
3607 file_lock.fl_flags = FL_POSIX;
d5b9026a 3608 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3609
3610 file_lock.fl_start = lock->lk_offset;
87df4de8 3611 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3612 nfs4_transform_lock_offset(&file_lock);
3613
3614 /*
3615 * Try to lock the file in the VFS.
3616 * Note: locks.c uses the BKL to protect the inode's lock list.
3617 */
3618
fd85b817 3619 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3620 switch (-err) {
1da177e4
LT		 3621 case 0: /* success! */
3622 update_stateid(&lock_stp->st_stateid);
3623 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3624 sizeof(stateid_t));
b8dd7b9a 3625 status = 0;
eb76b3fd
AA		 3626 break;
3627 case (EAGAIN): /* conflock holds conflicting lock */
3628 status = nfserr_denied;
3629 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3630 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3631 break;
1da177e4
LT		 3632 case (EDEADLK):
3633 status = nfserr_deadlock;
eb76b3fd 3634 break;
1da177e4 3635 default:
fd85b817 3636 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3637 status = nfserr_resource;
3638 break;
1da177e4 3639 }
1da177e4 3640out:
8a280510 3641 if (status && lock->lk_is_new && lock_sop)
f044ff83 3642 release_lockowner(lock_sop);
3a65588a
BF		 3643 if (lock->lk_replay_owner) {
3644 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3645 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3646 }
1da177e4
LT		 3647 nfs4_unlock_state();
3648 return status;
3649}
3650
55ef1274
BF		 3651/*
3652 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3653 * so we do a temporary open here just to get an open file to pass to
3654 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3655 * inode operation.)
3656 */
3657static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3658{
3659 struct file *file;
3660 int err;
3661
3662 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3663 if (err)
3664 return err;
3665 err = vfs_test_lock(file, lock);
3666 nfsd_close(file);
3667 return err;
3668}
3669
1da177e4
LT		 3670/*
3671 * LOCKT operation
3672 */
b37ad28b 3673__be32
ca364317
BF		 3674nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3675 struct nfsd4_lockt *lockt)
1da177e4
LT		 3676{
3677 struct inode *inode;
1da177e4 3678 struct file_lock file_lock;
fd85b817 3679 int error;
b37ad28b 3680 __be32 status;
1da177e4 3681
af558e33 3682 if (locks_in_grace())
1da177e4
LT		 3683 return nfserr_grace;
3684
3685 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3686 return nfserr_inval;
3687
3688 lockt->lt_stateowner = NULL;
3689 nfs4_lock_state();
3690
3691 status = nfserr_stale_clientid;
60adfc50 3692 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3693 goto out;
1da177e4 3694
ca364317 3695 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3696 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3697 if (status == nfserr_symlink)
3698 status = nfserr_inval;
3699 goto out;
3700 }
3701
ca364317 3702 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3703 locks_init_lock(&file_lock);
3704 switch (lockt->lt_type) {
3705 case NFS4_READ_LT:
3706 case NFS4_READW_LT:
3707 file_lock.fl_type = F_RDLCK;
3708 break;
3709 case NFS4_WRITE_LT:
3710 case NFS4_WRITEW_LT:
3711 file_lock.fl_type = F_WRLCK;
3712 break;
3713 default:
2fdada03 3714 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3715 status = nfserr_inval;
3716 goto out;
3717 }
3718
3719 lockt->lt_stateowner = find_lockstateowner_str(inode,
3720 &lockt->lt_clientid, &lockt->lt_owner);
3721 if (lockt->lt_stateowner)
3722 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3723 file_lock.fl_pid = current->tgid;
3724 file_lock.fl_flags = FL_POSIX;
3725
3726 file_lock.fl_start = lockt->lt_offset;
87df4de8 3727 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3728
3729 nfs4_transform_lock_offset(&file_lock);
3730
1da177e4 3731 status = nfs_ok;
55ef1274 3732 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3733 if (error) {
3734 status = nfserrno(error);
3735 goto out;
3736 }
9d6a8c5c 3737 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3738 status = nfserr_denied;
9d6a8c5c 3739 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3740 }
3741out:
3742 nfs4_unlock_state();
3743 return status;
3744}
3745
b37ad28b 3746__be32
ca364317 3747nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3748 struct nfsd4_locku *locku)
1da177e4
LT		 3749{
3750 struct nfs4_stateid *stp;
3751 struct file *filp = NULL;
3752 struct file_lock file_lock;
b37ad28b 3753 __be32 status;
b8dd7b9a 3754 int err;
1da177e4
LT		 3755
3756 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3757 (long long) locku->lu_offset,
3758 (long long) locku->lu_length);
3759
3760 if (check_lock_length(locku->lu_offset, locku->lu_length))
3761 return nfserr_inval;
3762
3763 nfs4_lock_state();
3764
dd453dfd 3765 if ((status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3766 locku->lu_seqid,
3767 &locku->lu_stateid,
f3362737 3768 LOCK_STATE,
1da177e4
LT		 3769 &locku->lu_stateowner, &stp, NULL)))
3770 goto out;
3771
3772 filp = stp->st_vfs_file;
3773 BUG_ON(!filp);
3774 locks_init_lock(&file_lock);
3775 file_lock.fl_type = F_UNLCK;
3776 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3777 file_lock.fl_pid = current->tgid;
3778 file_lock.fl_file = filp;
3779 file_lock.fl_flags = FL_POSIX;
d5b9026a 3780 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3781 file_lock.fl_start = locku->lu_offset;
3782
87df4de8 3783 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3784 nfs4_transform_lock_offset(&file_lock);
3785
3786 /*
3787 * Try to unlock the file in the VFS.
3788 */
fd85b817 3789 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3790 if (err) {
fd85b817 3791 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3792 goto out_nfserr;
3793 }
3794 /*
3795 * OK, unlock succeeded; the only thing left to do is update the stateid.
3796 */
3797 update_stateid(&stp->st_stateid);
3798 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3799
3800out:
f2327d9a 3801 if (locku->lu_stateowner) {
1da177e4 3802 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3803 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3804 }
1da177e4
LT		 3805 nfs4_unlock_state();
3806 return status;
3807
3808out_nfserr:
b8dd7b9a 3809 status = nfserrno(err);
1da177e4
LT		 3810 goto out;
3811}
3812
3813/*
3814 * returns
3815 * 1: locks held by lockowner
3816 * 0: no locks held by lockowner
3817 */
3818static int
3819check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3820{
3821 struct file_lock **flpp;
7eaa36e2 3822 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3823 int status = 0;
3824
3825 lock_kernel();
3826 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3827 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3828 status = 1;
3829 goto out;
796dadfd 3830 }
1da177e4
LT		 3831 }
3832out:
3833 unlock_kernel();
3834 return status;
3835}
3836
b37ad28b 3837__be32
b591480b
BF		 3838nfsd4_release_lockowner(struct svc_rqst *rqstp,
3839 struct nfsd4_compound_state *cstate,
3840 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3841{
3842 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3843 struct nfs4_stateowner *sop;
3844 struct nfs4_stateid *stp;
1da177e4 3845 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3846 struct list_head matches;
3847 int i;
b37ad28b 3848 __be32 status;
1da177e4
LT		 3849
3850 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3851 clid->cl_boot, clid->cl_id);
3852
3853 /* XXX check for lease expiration */
3854
3855 status = nfserr_stale_clientid;
849823c5 3856 if (STALE_CLIENTID(clid))
1da177e4 3857 return status;
1da177e4
LT		 3858
3859 nfs4_lock_state();
3860
3e9e3dbe
N		 3861 status = nfserr_locks_held;
3862 /* XXX: we're doing a linear search through all the lockowners.
3863 * Yipes! For now we'll just hope clients aren't really using
3864 * release_lockowner much, but eventually we have to fix these
3865 * data structures. */
3866 INIT_LIST_HEAD(&matches);
3867 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3868 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3869 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3870 continue;
3871 list_for_each_entry(stp, &sop->so_stateids,
3872 st_perstateowner) {
3873 if (check_for_locks(stp->st_vfs_file, sop))
3874 goto out;
3875 /* Note: so_perclient unused for lockowners,
3876 * so it's OK to fool with here. */
3877 list_add(&sop->so_perclient, &matches);
3878 }
1da177e4 3879 }
3e9e3dbe
N		 3880 }
3881 /* Clients probably won't expect us to return with some (but not all)
3882 * of the lockowner state released; so don't release any until all
3883 * have been checked. */
3884 status = nfs_ok;
0fa822e4
N		 3885 while (!list_empty(&matches)) {
3886 sop = list_entry(matches.next, struct nfs4_stateowner,
3887 so_perclient);
3888 /* unhash_stateowner deletes so_perclient only
3889 * for openowners. */
3890 list_del(&sop->so_perclient);
f044ff83 3891 release_lockowner(sop);
1da177e4
LT		 3892 }
3893out:
3894 nfs4_unlock_state();
3895 return status;
3896}
3897
3898static inline struct nfs4_client_reclaim *
a55370a3 3899alloc_reclaim(void)
1da177e4 3900{
a55370a3 3901 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3902}
3903
c7b9a459 3904int
a1bcecd2 3905nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3906{
3907 unsigned int strhashval = clientstr_hashval(name);
3908 struct nfs4_client *clp;
3909
a1bcecd2 3910 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3911 return clp ? 1 : 0;
3912}
3913
1da177e4
LT		 3914/*
3915 * failure => all reset bets are off, nfserr_no_grace...
3916 */
190e4fbf
N		 3917int
3918nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3919{
3920 unsigned int strhashval;
3921 struct nfs4_client_reclaim *crp = NULL;
3922
a55370a3
N		 3923 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3924 crp = alloc_reclaim();
1da177e4
LT		 3925 if (!crp)
3926 return 0;
a55370a3 3927 strhashval = clientstr_hashval(name);
1da177e4
LT		 3928 INIT_LIST_HEAD(&crp->cr_strhash);
3929 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3930 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3931 reclaim_str_hashtbl_size++;
3932 return 1;
3933}
3934
3935static void
3936nfs4_release_reclaim(void)
3937{
3938 struct nfs4_client_reclaim *crp = NULL;
3939 int i;
3940
1da177e4
LT		 3941 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3942 while (!list_empty(&reclaim_str_hashtbl[i])) {
3943 crp = list_entry(reclaim_str_hashtbl[i].next,
3944 struct nfs4_client_reclaim, cr_strhash);
3945 list_del(&crp->cr_strhash);
1da177e4
LT		 3946 kfree(crp);
3947 reclaim_str_hashtbl_size--;
3948 }
3949 }
3950 BUG_ON(reclaim_str_hashtbl_size);
3951}
3952
3953/*
3954 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3955static struct nfs4_client_reclaim *
1da177e4
LT		 3956nfs4_find_reclaim_client(clientid_t *clid)
3957{
3958 unsigned int strhashval;
3959 struct nfs4_client *clp;
3960 struct nfs4_client_reclaim *crp = NULL;
3961
3962
3963 /* find clientid in conf_id_hashtbl */
3964 clp = find_confirmed_client(clid);
3965 if (clp == NULL)
3966 return NULL;
3967
a55370a3
N		 3968 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3969 clp->cl_name.len, clp->cl_name.data,
3970 clp->cl_recdir);
1da177e4
LT		 3971
3972 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3973 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3974 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3975 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3976 return crp;
3977 }
3978 }
3979 return NULL;
3980}
3981
3982/*
3983* Called from OPEN. Look for clientid in reclaim list.
3984*/
b37ad28b 3985__be32
1da177e4
LT		 3986nfs4_check_open_reclaim(clientid_t *clid)
3987{
dfc83565 3988 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3989}
3990
ac4d8ff2 3991/* initialization to perform at module load time: */
1da177e4 3992
e8ff2a84 3993int
ac4d8ff2 3994nfs4_state_init(void)
1da177e4 3995{
e8ff2a84 3996 int i, status;
1da177e4 3997
e8ff2a84
BF		 3998 status = nfsd4_init_slabs();
3999 if (status)
4000 return status;
1da177e4
LT		 4001 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4002 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4003 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4004 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4005 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
02cb2858 4006 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
1da177e4 4007 }
5282fd72
ME		 4008 for (i = 0; i < SESSION_HASH_SIZE; i++)
4009 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 4010 for (i = 0; i < FILE_HASH_SIZE; i++) {
4011 INIT_LIST_HEAD(&file_hashtbl[i]);
4012 }
4013 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4014 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4015 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
4016 }
4017 for (i = 0; i < STATEID_HASH_SIZE; i++) {
4018 INIT_LIST_HEAD(&stateid_hashtbl[i]);
4019 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
4020 }
4021 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4022 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
4023 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4024 }
1da177e4 4025 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 4026 INIT_LIST_HEAD(&close_lru);
4027 INIT_LIST_HEAD(&client_lru);
4028 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2 4029 reclaim_str_hashtbl_size = 0;
e8ff2a84 4030 return 0;
ac4d8ff2
N		 4031}
4032
190e4fbf
N		 4033static void
4034nfsd4_load_reboot_recovery_data(void)
4035{
4036 int status;
4037
0964a3d3
N		 4038 nfs4_lock_state();
4039 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 4040 status = nfsd4_recdir_load();
0964a3d3 4041 nfs4_unlock_state();
190e4fbf
N		 4042 if (status)
4043 printk("NFSD: Failure reading reboot recovery data\n");
4044}
4045
9a8db97e
ME		 4046unsigned long
4047get_nfs4_grace_period(void)
4048{
4049 return max(user_lease_time, lease_time) * HZ;
4050}
4051
c2f1a551
MS		 4052/*
4053 * Since the lifetime of a delegation isn't limited to that of an open, a
4054 * client may quite reasonably hang on to a delegation as long as it has
4055 * the inode cached. This becomes an obvious problem the first time a
4056 * client's inode cache approaches the size of the server's total memory.
4057 *
4058 * For now we avoid this problem by imposing a hard limit on the number
4059 * of delegations, which varies according to the server's memory size.
4060 */
4061static void
4062set_max_delegations(void)
4063{
4064 /*
4065 * Allow at most 4 delegations per megabyte of RAM. Quick
4066 * estimates suggest that in the worst case (where every delegation
4067 * is for a different inode), a delegation could take about 1.5K,
4068 * giving a worst case usage of about 6% of memory.
4069 */
4070 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4071}
4072
ac4d8ff2
N		 4073/* initialization to perform when the nfsd service is started: */
4074
4075static void
4076__nfs4_state_start(void)
4077{
9a8db97e 4078 unsigned long grace_time;
ac4d8ff2 4079
1da177e4 4080 boot_time = get_seconds();
af558e33 4081 grace_time = get_nfs4_grace_period();
d99a05ad 4082 lease_time = user_lease_time;
af558e33 4083 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 4084 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4085 grace_time/HZ);
58da282b 4086 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 4087 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 4088 set_max_delegations();
1da177e4
LT		 4089}
4090
e8ff2a84 4091void
76a3550e 4092nfs4_state_start(void)
1da177e4 4093{
1da177e4 4094 if (nfs4_init)
e8ff2a84 4095 return;
190e4fbf 4096 nfsd4_load_reboot_recovery_data();
76a3550e 4097 __nfs4_state_start();
1da177e4 4098 nfs4_init = 1;
e8ff2a84 4099 return;
1da177e4
LT		 4100}
4101
1da177e4
LT		 4102time_t
4103nfs4_lease_time(void)
4104{
4105 return lease_time;
4106}
4107
4108static void
4109__nfs4_state_shutdown(void)
4110{
4111 int i;
4112 struct nfs4_client *clp = NULL;
4113 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 4114 struct list_head *pos, *next, reaplist;
4115
1da177e4
LT		 4116 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4117 while (!list_empty(&conf_id_hashtbl[i])) {
4118 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4119 expire_client(clp);
4120 }
4121 while (!list_empty(&unconf_str_hashtbl[i])) {
4122 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4123 expire_client(clp);
4124 }
4125 }
4126 INIT_LIST_HEAD(&reaplist);
4127 spin_lock(&recall_lock);
4128 list_for_each_safe(pos, next, &del_recall_lru) {
4129 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4130 list_move(&dp->dl_recall_lru, &reaplist);
4131 }
4132 spin_unlock(&recall_lock);
4133 list_for_each_safe(pos, next, &reaplist) {
4134 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4135 list_del_init(&dp->dl_recall_lru);
4136 unhash_delegation(dp);
4137 }
4138
190e4fbf 4139 nfsd4_shutdown_recdir();
1da177e4 4140 nfs4_init = 0;
1da177e4
LT		 4141}
4142
4143void
4144nfs4_state_shutdown(void)
4145{
5e8d5c29
N		 4146 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4147 destroy_workqueue(laundry_wq);
2c5e7615 4148 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 4149 nfs4_lock_state();
4150 nfs4_release_reclaim();
4151 __nfs4_state_shutdown();
1da177e4
LT		 4152 nfs4_unlock_state();
4153}
4154
3dd98a3b
JL		 4155/*
4156 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4157 * accessed when nfsd is starting.
4158 */
0964a3d3
N		 4159static void
4160nfs4_set_recdir(char *recdir)
4161{
0964a3d3 4162 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 4163}
4164
4165/*
4166 * Change the NFSv4 recovery directory to recdir.
4167 */
4168int
4169nfs4_reset_recoverydir(char *recdir)
4170{
4171 int status;
a63bb996 4172 struct path path;
0964a3d3 4173
a63bb996 4174 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 4175 if (status)
4176 return status;
4177 status = -ENOTDIR;
a63bb996 4178 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 4179 nfs4_set_recdir(recdir);
4180 status = 0;
4181 }
a63bb996 4182 path_put(&path);
0964a3d3
N		 4183 return status;
4184}
4185
3dd98a3b
JL		 4186char *
4187nfs4_recoverydir(void)
4188{
4189 return user_recovery_dirname;
4190}
4191
1da177e4
LT		 4192/*
4193 * Called when leasetime is changed.
4194 *
d99a05ad
N		 4195 * The only way the protocol gives us to handle on-the-fly lease changes is to
4196 * simulate a reboot. Instead of doing that, we just wait till the next time
4197 * we start to register any changes in lease time. If the administrator
4198 * really wants to change the lease time *now*, they can go ahead and bring
4199 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 4200 *
4201 * user_lease_time is protected by nfsd_mutex since it's only really accessed
4202 * when nfsd is starting
1da177e4
LT		 4203 */
4204void
4205nfs4_reset_lease(time_t leasetime)
4206{
d99a05ad 4207 user_lease_time = leasetime;
1da177e4 4208}
Linux 6.x block layer and io_uring tree(s)