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nfsd41: remove redundant forechannel max requests check
[deliverable/linux.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
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
0c193054 417 * NFSD_MAX_SLOTS_PER_SESSION and by nfsd_drc_max_mem.
ec6b5d7b 418 *
0c193054
AA		 419 * If we run out of reserved DRC memory we should (up to a point) re-negotiate
420 * active sessions and reduce their slot usage to make rooom for new
421 * connections. For now we just fail the create session.
ec6b5d7b
AA		 422 */
423static int set_forechannel_maxreqs(struct nfsd4_channel_attrs *fchan)
424{
0c193054 425 int mem;
ec6b5d7b 426
5d77ddfb
AA		 427 if (fchan->maxreqs < 1)
428 return nfserr_inval;
429 else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
430 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
431
0c193054 432 mem = fchan->maxreqs * NFSD_SLOT_CACHE_SIZE;
b101ebbc 433
4bd9b0f4 434 spin_lock(&nfsd_drc_lock);
0c193054
AA		 435 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem)
436 mem = ((nfsd_drc_max_mem - nfsd_drc_mem_used) /
437 NFSD_SLOT_CACHE_SIZE) * NFSD_SLOT_CACHE_SIZE;
438 nfsd_drc_mem_used += mem;
4bd9b0f4 439 spin_unlock(&nfsd_drc_lock);
ec6b5d7b 440
0c193054 441 fchan->maxreqs = mem / NFSD_SLOT_CACHE_SIZE;
b101ebbc
AA		 442 if (fchan->maxreqs == 0)
443 return nfserr_resource;
444 return 0;
ec6b5d7b
AA		 445}
446
447/*
448 * fchan holds the client values on input, and the server values on output
449 */
450static int init_forechannel_attrs(struct svc_rqst *rqstp,
6c18ba9f
AB		 451 struct nfsd4_channel_attrs *session_fchan,
452 struct nfsd4_channel_attrs *fchan)
ec6b5d7b
AA		 453{
454 int status = 0;
455 __u32 maxcount = svc_max_payload(rqstp);
456
457 /* headerpadsz set to zero in encode routine */
458
459 /* Use the client's max request and max response size if possible */
460 if (fchan->maxreq_sz > maxcount)
461 fchan->maxreq_sz = maxcount;
6c18ba9f 462 session_fchan->maxreq_sz = fchan->maxreq_sz;
ec6b5d7b
AA		 463
464 if (fchan->maxresp_sz > maxcount)
465 fchan->maxresp_sz = maxcount;
6c18ba9f 466 session_fchan->maxresp_sz = fchan->maxresp_sz;
ec6b5d7b 467
0c193054 468 session_fchan->maxresp_cached = NFSD_SLOT_CACHE_SIZE;
6c18ba9f 469 fchan->maxresp_cached = session_fchan->maxresp_cached;
ec6b5d7b
AA		 470
471 /* Use the client's maxops if possible */
472 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
473 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
6c18ba9f 474 session_fchan->maxops = fchan->maxops;
ec6b5d7b 475
ec6b5d7b
AA		 476 /* FIXME: Error means no more DRC pages so the server should
477 * recover pages from existing sessions. For now fail session
478 * creation.
479 */
480 status = set_forechannel_maxreqs(fchan);
481
6c18ba9f 482 session_fchan->maxreqs = fchan->maxreqs;
ec6b5d7b
AA		 483 return status;
484}
485
486static int
487alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
488 struct nfsd4_create_session *cses)
489{
490 struct nfsd4_session *new, tmp;
491 int idx, status = nfserr_resource, slotsize;
492
493 memset(&tmp, 0, sizeof(tmp));
494
495 /* FIXME: For now, we just accept the client back channel attributes. */
6c18ba9f
AB		 496 tmp.se_bchannel = cses->back_channel;
497 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
498 &cses->fore_channel);
ec6b5d7b
AA		 499 if (status)
500 goto out;
501
502 /* allocate struct nfsd4_session and slot table in one piece */
6c18ba9f 503 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot);
ec6b5d7b
AA		 504 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
505 if (!new)
506 goto out;
507
508 memcpy(new, &tmp, sizeof(*new));
509
510 new->se_client = clp;
511 gen_sessionid(new);
512 idx = hash_sessionid(&new->se_sessionid);
513 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
514 NFS4_MAX_SESSIONID_LEN);
515
516 new->se_flags = cses->flags;
517 kref_init(&new->se_ref);
518 spin_lock(&sessionid_lock);
519 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
520 list_add(&new->se_perclnt, &clp->cl_sessions);
521 spin_unlock(&sessionid_lock);
522
523 status = nfs_ok;
524out:
525 return status;
526}
527
5282fd72
ME		 528/* caller must hold sessionid_lock */
529static struct nfsd4_session *
530find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
531{
532 struct nfsd4_session *elem;
533 int idx;
534
535 dump_sessionid(__func__, sessionid);
536 idx = hash_sessionid(sessionid);
537 dprintk("%s: idx is %d\n", __func__, idx);
538 /* Search in the appropriate list */
539 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
540 dump_sessionid("list traversal", &elem->se_sessionid);
541 if (!memcmp(elem->se_sessionid.data, sessionid->data,
542 NFS4_MAX_SESSIONID_LEN)) {
543 return elem;
544 }
545 }
546
547 dprintk("%s: session not found\n", __func__);
548 return NULL;
549}
550
551/* caller must hold sessionid_lock */
7116ed6b 552static void
5282fd72 553unhash_session(struct nfsd4_session *ses)
7116ed6b
AA		 554{
555 list_del(&ses->se_hash);
556 list_del(&ses->se_perclnt);
5282fd72
ME		 557}
558
559static void
560release_session(struct nfsd4_session *ses)
561{
562 spin_lock(&sessionid_lock);
563 unhash_session(ses);
564 spin_unlock(&sessionid_lock);
7116ed6b
AA		 565 nfsd4_put_session(ses);
566}
567
14778a13
AA		 568static void nfsd4_release_respages(struct page **respages, short resused);
569
7116ed6b
AA		 570void
571free_session(struct kref *kref)
572{
573 struct nfsd4_session *ses;
14778a13 574 int i;
7116ed6b
AA		 575
576 ses = container_of(kref, struct nfsd4_session, se_ref);
6c18ba9f 577 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
14778a13
AA		 578 struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
579 nfsd4_release_respages(e->ce_respages, e->ce_resused);
580 }
be98d1bb 581 spin_lock(&nfsd_drc_lock);
0c193054 582 nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
be98d1bb 583 spin_unlock(&nfsd_drc_lock);
7116ed6b
AA		 584 kfree(ses);
585}
586
1da177e4
LT		 587static inline void
588renew_client(struct nfs4_client *clp)
589{
590 /*
591 * Move client to the end to the LRU list.
592 */
593 dprintk("renewing client (clientid %08x/%08x)\n",
594 clp->cl_clientid.cl_boot,
595 clp->cl_clientid.cl_id);
596 list_move_tail(&clp->cl_lru, &client_lru);
597 clp->cl_time = get_seconds();
598}
599
600/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
601static int
602STALE_CLIENTID(clientid_t *clid)
603{
604 if (clid->cl_boot == boot_time)
605 return 0;
60adfc50
AA		 606 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
607 clid->cl_boot, clid->cl_id, boot_time);
1da177e4
LT		 608 return 1;
609}
610
611/*
612 * XXX Should we use a slab cache ?
613 * This type of memory management is somewhat inefficient, but we use it
614 * anyway since SETCLIENTID is not a common operation.
615 */
35bba9a3 616static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 617{
618 struct nfs4_client *clp;
619
35bba9a3
BF		 620 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
621 if (clp == NULL)
622 return NULL;
623 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
624 if (clp->cl_name.data == NULL) {
625 kfree(clp);
626 return NULL;
1da177e4 627 }
35bba9a3
BF		 628 memcpy(clp->cl_name.data, name.data, name.len);
629 clp->cl_name.len = name.len;
1da177e4
LT		 630 return clp;
631}
632
1b1a9b31
BF		 633static void
634shutdown_callback_client(struct nfs4_client *clp)
635{
c237dc03 636 struct rpc_clnt *clnt = clp->cl_cb_conn.cb_client;
1b1a9b31 637
1b1a9b31 638 if (clnt) {
404ec117
BF		 639 /*
640 * Callback threads take a reference on the client, so there
641 * should be no outstanding callbacks at this point.
642 */
c237dc03 643 clp->cl_cb_conn.cb_client = NULL;
1b1a9b31
BF		 644 rpc_shutdown_client(clnt);
645 }
c237dc03
BF		 646 if (clp->cl_cb_conn.cb_cred) {
647 put_rpccred(clp->cl_cb_conn.cb_cred);
648 clp->cl_cb_conn.cb_cred = NULL;
3cef9ab2 649 }
1b1a9b31
BF		 650}
651
1da177e4
LT		 652static inline void
653free_client(struct nfs4_client *clp)
654{
1b1a9b31 655 shutdown_callback_client(clp);
38eb76a5
AA		 656 nfsd4_release_respages(clp->cl_slot.sl_cache_entry.ce_respages,
657 clp->cl_slot.sl_cache_entry.ce_resused);
1da177e4
LT		 658 if (clp->cl_cred.cr_group_info)
659 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 660 kfree(clp->cl_principal);
1da177e4
LT		 661 kfree(clp->cl_name.data);
662 kfree(clp);
663}
664
665void
666put_nfs4_client(struct nfs4_client *clp)
667{
668 if (atomic_dec_and_test(&clp->cl_count))
669 free_client(clp);
670}
671
672static void
673expire_client(struct nfs4_client *clp)
674{
675 struct nfs4_stateowner *sop;
676 struct nfs4_delegation *dp;
1da177e4
LT		 677 struct list_head reaplist;
678
679 dprintk("NFSD: expire_client cl_count %d\n",
680 atomic_read(&clp->cl_count));
681
1da177e4
LT		 682 INIT_LIST_HEAD(&reaplist);
683 spin_lock(&recall_lock);
ea1da636
N		 684 while (!list_empty(&clp->cl_delegations)) {
685 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 686 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
687 dp->dl_flock);
ea1da636 688 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 689 list_move(&dp->dl_recall_lru, &reaplist);
690 }
691 spin_unlock(&recall_lock);
692 while (!list_empty(&reaplist)) {
693 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
694 list_del_init(&dp->dl_recall_lru);
695 unhash_delegation(dp);
696 }
697 list_del(&clp->cl_idhash);
698 list_del(&clp->cl_strhash);
699 list_del(&clp->cl_lru);
ea1da636
N		 700 while (!list_empty(&clp->cl_openowners)) {
701 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
f044ff83 702 release_openowner(sop);
1da177e4 703 }
c4bf7868
ME		 704 while (!list_empty(&clp->cl_sessions)) {
705 struct nfsd4_session *ses;
706 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
707 se_perclnt);
708 release_session(ses);
709 }
1da177e4
LT		 710 put_nfs4_client(clp);
711}
712
35bba9a3
BF		 713static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
714{
1da177e4
LT		 715 struct nfs4_client *clp;
716
35bba9a3
BF		 717 clp = alloc_client(name);
718 if (clp == NULL)
719 return NULL;
a55370a3 720 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4 721 atomic_set(&clp->cl_count, 1);
c237dc03 722 atomic_set(&clp->cl_cb_conn.cb_set, 0);
1da177e4
LT		 723 INIT_LIST_HEAD(&clp->cl_idhash);
724 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 725 INIT_LIST_HEAD(&clp->cl_openowners);
726 INIT_LIST_HEAD(&clp->cl_delegations);
9fb87070 727 INIT_LIST_HEAD(&clp->cl_sessions);
1da177e4 728 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 729 return clp;
730}
731
35bba9a3
BF		 732static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
733{
734 memcpy(target->cl_verifier.data, source->data,
735 sizeof(target->cl_verifier.data));
1da177e4
LT		 736}
737
35bba9a3
BF		 738static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
739{
1da177e4
LT		 740 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
741 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
742}
743
35bba9a3
BF		 744static void copy_cred(struct svc_cred *target, struct svc_cred *source)
745{
1da177e4
LT		 746 target->cr_uid = source->cr_uid;
747 target->cr_gid = source->cr_gid;
748 target->cr_group_info = source->cr_group_info;
749 get_group_info(target->cr_group_info);
750}
751
35bba9a3 752static int same_name(const char *n1, const char *n2)
599e0a22 753{
a55370a3 754 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 755}
756
757static int
599e0a22
BF		 758same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
759{
760 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 761}
762
763static int
599e0a22
BF		 764same_clid(clientid_t *cl1, clientid_t *cl2)
765{
766 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 767}
768
769/* XXX what about NGROUP */
770static int
599e0a22
BF		 771same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
772{
773 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 774}
775
5ec7b46c
BF		 776static void gen_clid(struct nfs4_client *clp)
777{
778 static u32 current_clientid = 1;
779
1da177e4
LT		 780 clp->cl_clientid.cl_boot = boot_time;
781 clp->cl_clientid.cl_id = current_clientid++;
782}
783
deda2faa
BF		 784static void gen_confirm(struct nfs4_client *clp)
785{
786 static u32 i;
787 u32 *p;
1da177e4 788
1da177e4 789 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 790 *p++ = get_seconds();
791 *p++ = i++;
1da177e4
LT		 792}
793
35bba9a3
BF		 794static int check_name(struct xdr_netobj name)
795{
1da177e4
LT		 796 if (name.len == 0)
797 return 0;
798 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 799 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 800 return 0;
801 }
802 return 1;
803}
804
fd39ca9a 805static void
1da177e4
LT		 806add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
807{
808 unsigned int idhashval;
809
810 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
811 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
812 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
813 list_add_tail(&clp->cl_lru, &client_lru);
814 clp->cl_time = get_seconds();
815}
816
fd39ca9a 817static void
1da177e4
LT		 818move_to_confirmed(struct nfs4_client *clp)
819{
820 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
821 unsigned int strhashval;
822
823 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
824 list_del_init(&clp->cl_strhash);
f116629d 825 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 826 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 827 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
828 renew_client(clp);
829}
830
831static struct nfs4_client *
832find_confirmed_client(clientid_t *clid)
833{
834 struct nfs4_client *clp;
835 unsigned int idhashval = clientid_hashval(clid->cl_id);
836
837 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 838 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 839 return clp;
840 }
841 return NULL;
842}
843
844static struct nfs4_client *
845find_unconfirmed_client(clientid_t *clid)
846{
847 struct nfs4_client *clp;
848 unsigned int idhashval = clientid_hashval(clid->cl_id);
849
850 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 851 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 852 return clp;
853 }
854 return NULL;
855}
856
a1bcecd2
AA		 857/*
858 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
859 * parameter. Matching is based on the fact the at least one of the
860 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
861 *
862 * FIXME: we need to unify the clientid namespaces for nfsv4.x
863 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
864 * and SET_CLIENTID{,_CONFIRM}
865 */
866static inline int
867match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
868{
869 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
870 return use_exchange_id == has_exchange_flags;
871}
872
28ce6054 873static struct nfs4_client *
a1bcecd2
AA		 874find_confirmed_client_by_str(const char *dname, unsigned int hashval,
875 bool use_exchange_id)
28ce6054
N		 876{
877 struct nfs4_client *clp;
878
879 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 880 if (same_name(clp->cl_recdir, dname) &&
881 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 882 return clp;
883 }
884 return NULL;
885}
886
887static struct nfs4_client *
a1bcecd2
AA		 888find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
889 bool use_exchange_id)
28ce6054
N		 890{
891 struct nfs4_client *clp;
892
893 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
a1bcecd2
AA		 894 if (same_name(clp->cl_recdir, dname) &&
895 match_clientid_establishment(clp, use_exchange_id))
28ce6054
N		 896 return clp;
897 }
898 return NULL;
899}
900
1da177e4
LT		 901/* a helper function for parse_callback */
902static int
903parse_octet(unsigned int *lenp, char **addrp)
904{
905 unsigned int len = *lenp;
906 char *p = *addrp;
907 int n = -1;
908 char c;
909
910 for (;;) {
911 if (!len)
912 break;
913 len--;
914 c = *p++;
915 if (c == '.')
916 break;
917 if ((c < '0') || (c > '9')) {
918 n = -1;
919 break;
920 }
921 if (n < 0)
922 n = 0;
923 n = (n * 10) + (c - '0');
924 if (n > 255) {
925 n = -1;
926 break;
927 }
928 }
929 *lenp = len;
930 *addrp = p;
931 return n;
932}
933
934/* parse and set the setclientid ipv4 callback address */
fd39ca9a 935static int
1da177e4
LT		 936parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
937{
938 int temp = 0;
939 u32 cbaddr = 0;
940 u16 cbport = 0;
941 u32 addrlen = addr_len;
942 char *addr = addr_val;
943 int i, shift;
944
945 /* ipaddress */
946 shift = 24;
947 for(i = 4; i > 0 ; i--) {
948 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
949 return 0;
950 }
951 cbaddr |= (temp << shift);
952 if (shift > 0)
953 shift -= 8;
954 }
955 *cbaddrp = cbaddr;
956
957 /* port */
958 shift = 8;
959 for(i = 2; i > 0 ; i--) {
960 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
961 return 0;
962 }
963 cbport |= (temp << shift);
964 if (shift > 0)
965 shift -= 8;
966 }
967 *cbportp = cbport;
968 return 1;
969}
970
fd39ca9a 971static void
1da177e4
LT		 972gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
973{
c237dc03 974 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
1da177e4
LT		 975
976 /* Currently, we only support tcp for the callback channel */
977 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
978 goto out_err;
979
980 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
981 &cb->cb_addr, &cb->cb_port)))
982 goto out_err;
ab52ae6d 983 cb->cb_minorversion = 0;
1da177e4
LT		 984 cb->cb_prog = se->se_callback_prog;
985 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 986 return;
987out_err:
849823c5 988 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 989 "will not receive delegations\n",
990 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
991
1da177e4
LT		 992 return;
993}
994
074fe897
AA		 995void
996nfsd4_set_statp(struct svc_rqst *rqstp, __be32 *statp)
997{
998 struct nfsd4_compoundres *resp = rqstp->rq_resp;
999
1000 resp->cstate.statp = statp;
1001}
1002
1003/*
1004 * Dereference the result pages.
1005 */
1006static void
1007nfsd4_release_respages(struct page **respages, short resused)
1008{
1009 int i;
1010
1011 dprintk("--> %s\n", __func__);
1012 for (i = 0; i < resused; i++) {
1013 if (!respages[i])
1014 continue;
1015 put_page(respages[i]);
1016 respages[i] = NULL;
1017 }
1018}
1019
1020static void
1021nfsd4_copy_pages(struct page **topages, struct page **frompages, short count)
1022{
1023 int i;
1024
1025 for (i = 0; i < count; i++) {
1026 topages[i] = frompages[i];
1027 if (!topages[i])
1028 continue;
1029 get_page(topages[i]);
1030 }
1031}
1032
1033/*
1034 * Cache the reply pages up to NFSD_PAGES_PER_SLOT + 1, clearing the previous
1035 * pages. We add a page to NFSD_PAGES_PER_SLOT for the case where the total
1036 * length of the XDR response is less than se_fmaxresp_cached
1037 * (NFSD_PAGES_PER_SLOT * PAGE_SIZE) but the xdr_buf pages is used for a
1038 * of the reply (e.g. readdir).
1039 *
1040 * Store the base and length of the rq_req.head[0] page
1041 * of the NFSv4.1 data, just past the rpc header.
1042 */
1043void
1044nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1045{
1046 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1047 struct svc_rqst *rqstp = resp->rqstp;
1048 struct nfsd4_compoundargs *args = rqstp->rq_argp;
1049 struct nfsd4_op *op = &args->ops[resp->opcnt];
1050 struct kvec *resv = &rqstp->rq_res.head[0];
1051
1052 dprintk("--> %s entry %p\n", __func__, entry);
1053
1054 /* Don't cache a failed OP_SEQUENCE. */
1055 if (resp->opcnt == 1 && op->opnum == OP_SEQUENCE && resp->cstate.status)
1056 return;
bf864a31 1057
074fe897 1058 nfsd4_release_respages(entry->ce_respages, entry->ce_resused);
bf864a31
AA		 1059 entry->ce_opcnt = resp->opcnt;
1060 entry->ce_status = resp->cstate.status;
1061
1062 /*
1063 * Don't need a page to cache just the sequence operation - the slot
1064 * does this for us!
1065 */
1066
1067 if (nfsd4_not_cached(resp)) {
1068 entry->ce_resused = 0;
1069 entry->ce_rpchdrlen = 0;
1070 dprintk("%s Just cache SEQUENCE. ce_cachethis %d\n", __func__,
1071 resp->cstate.slot->sl_cache_entry.ce_cachethis);
1072 return;
1073 }
074fe897
AA		 1074 entry->ce_resused = rqstp->rq_resused;
1075 if (entry->ce_resused > NFSD_PAGES_PER_SLOT + 1)
1076 entry->ce_resused = NFSD_PAGES_PER_SLOT + 1;
1077 nfsd4_copy_pages(entry->ce_respages, rqstp->rq_respages,
1078 entry->ce_resused);
074fe897
AA		 1079 entry->ce_datav.iov_base = resp->cstate.statp;
1080 entry->ce_datav.iov_len = resv->iov_len - ((char *)resp->cstate.statp -
1081 (char *)page_address(rqstp->rq_respages[0]));
074fe897
AA		 1082 /* Current request rpc header length*/
1083 entry->ce_rpchdrlen = (char *)resp->cstate.statp -
1084 (char *)page_address(rqstp->rq_respages[0]);
1085}
1086
1087/*
1088 * We keep the rpc header, but take the nfs reply from the replycache.
1089 */
1090static int
1091nfsd41_copy_replay_data(struct nfsd4_compoundres *resp,
1092 struct nfsd4_cache_entry *entry)
1093{
1094 struct svc_rqst *rqstp = resp->rqstp;
1095 struct kvec *resv = &resp->rqstp->rq_res.head[0];
1096 int len;
1097
1098 /* Current request rpc header length*/
1099 len = (char *)resp->cstate.statp -
1100 (char *)page_address(rqstp->rq_respages[0]);
1101 if (entry->ce_datav.iov_len + len > PAGE_SIZE) {
1102 dprintk("%s v41 cached reply too large (%Zd).\n", __func__,
1103 entry->ce_datav.iov_len);
1104 return 0;
1105 }
1106 /* copy the cached reply nfsd data past the current rpc header */
1107 memcpy((char *)resv->iov_base + len, entry->ce_datav.iov_base,
1108 entry->ce_datav.iov_len);
1109 resv->iov_len = len + entry->ce_datav.iov_len;
1110 return 1;
1111}
1112
1113/*
1114 * Keep the first page of the replay. Copy the NFSv4.1 data from the first
1115 * cached page. Replace any futher replay pages from the cache.
1116 */
1117__be32
bf864a31
AA		 1118nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1119 struct nfsd4_sequence *seq)
074fe897
AA		 1120{
1121 struct nfsd4_cache_entry *entry = &resp->cstate.slot->sl_cache_entry;
1122 __be32 status;
1123
1124 dprintk("--> %s entry %p\n", __func__, entry);
1125
bf864a31
AA		 1126 /*
1127 * If this is just the sequence operation, we did not keep
1128 * a page in the cache entry because we can just use the
1129 * slot info stored in struct nfsd4_sequence that was checked
1130 * against the slot in nfsd4_sequence().
1131 *
1132 * This occurs when seq->cachethis is FALSE, or when the client
1133 * session inactivity timer fires and a solo sequence operation
1134 * is sent (lease renewal).
1135 */
1136 if (seq && nfsd4_not_cached(resp)) {
6c18ba9f 1137 seq->maxslots = resp->cstate.session->se_fchannel.maxreqs;
bf864a31
AA		 1138 return nfs_ok;
1139 }
074fe897
AA		 1140
1141 if (!nfsd41_copy_replay_data(resp, entry)) {
1142 /*
1143 * Not enough room to use the replay rpc header, send the
1144 * cached header. Release all the allocated result pages.
1145 */
1146 svc_free_res_pages(resp->rqstp);
1147 nfsd4_copy_pages(resp->rqstp->rq_respages, entry->ce_respages,
1148 entry->ce_resused);
1149 } else {
1150 /* Release all but the first allocated result page */
1151
1152 resp->rqstp->rq_resused--;
1153 svc_free_res_pages(resp->rqstp);
1154
1155 nfsd4_copy_pages(&resp->rqstp->rq_respages[1],
1156 &entry->ce_respages[1],
1157 entry->ce_resused - 1);
1158 }
1159
1160 resp->rqstp->rq_resused = entry->ce_resused;
da3846a2
AA		 1161 resp->opcnt = entry->ce_opcnt;
1162 resp->cstate.iovlen = entry->ce_datav.iov_len + entry->ce_rpchdrlen;
074fe897
AA		 1163 status = entry->ce_status;
1164
1165 return status;
1166}
1167
0733d213
AA		 1168/*
1169 * Set the exchange_id flags returned by the server.
1170 */
1171static void
1172nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1173{
1174 /* pNFS is not supported */
1175 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1176
1177 /* Referrals are supported, Migration is not. */
1178 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1179
1180 /* set the wire flags to return to client. */
1181 clid->flags = new->cl_exchange_flags;
1182}
1183
069b6ad4
AA		 1184__be32
1185nfsd4_exchange_id(struct svc_rqst *rqstp,
1186 struct nfsd4_compound_state *cstate,
1187 struct nfsd4_exchange_id *exid)
1188{
0733d213
AA		 1189 struct nfs4_client *unconf, *conf, *new;
1190 int status;
1191 unsigned int strhashval;
1192 char dname[HEXDIR_LEN];
1193 nfs4_verifier verf = exid->verifier;
1194 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
1195
1196 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1197 " ip_addr=%u flags %x, spa_how %d\n",
1198 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1199 ip_addr, exid->flags, exid->spa_how);
1200
1201 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1202 return nfserr_inval;
1203
1204 /* Currently only support SP4_NONE */
1205 switch (exid->spa_how) {
1206 case SP4_NONE:
1207 break;
1208 case SP4_SSV:
1209 return nfserr_encr_alg_unsupp;
1210 default:
1211 BUG(); /* checked by xdr code */
1212 case SP4_MACH_CRED:
1213 return nfserr_serverfault; /* no excuse :-/ */
1214 }
1215
1216 status = nfs4_make_rec_clidname(dname, &exid->clname);
1217
1218 if (status)
1219 goto error;
1220
1221 strhashval = clientstr_hashval(dname);
1222
1223 nfs4_lock_state();
1224 status = nfs_ok;
1225
a1bcecd2 1226 conf = find_confirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1227 if (conf) {
1228 if (!same_verf(&verf, &conf->cl_verifier)) {
1229 /* 18.35.4 case 8 */
1230 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1231 status = nfserr_not_same;
1232 goto out;
1233 }
1234 /* Client reboot: destroy old state */
1235 expire_client(conf);
1236 goto out_new;
1237 }
1238 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1239 /* 18.35.4 case 9 */
1240 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1241 status = nfserr_perm;
1242 goto out;
1243 }
1244 expire_client(conf);
1245 goto out_new;
1246 }
0733d213
AA		 1247 /*
1248 * Set bit when the owner id and verifier map to an already
1249 * confirmed client id (18.35.3).
1250 */
1251 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1252
1253 /*
1254 * Falling into 18.35.4 case 2, possible router replay.
1255 * Leave confirmed record intact and return same result.
1256 */
1257 copy_verf(conf, &verf);
1258 new = conf;
1259 goto out_copy;
6ddbbbfe
MS		 1260 }
1261
1262 /* 18.35.4 case 7 */
1263 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1264 status = nfserr_noent;
1265 goto out;
0733d213
AA		 1266 }
1267
a1bcecd2 1268 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
0733d213
AA		 1269 if (unconf) {
1270 /*
1271 * Possible retry or client restart. Per 18.35.4 case 4,
1272 * a new unconfirmed record should be generated regardless
1273 * of whether any properties have changed.
1274 */
1275 expire_client(unconf);
1276 }
1277
1278out_new:
1279 /* Normal case */
1280 new = create_client(exid->clname, dname);
1281 if (new == NULL) {
1282 status = nfserr_resource;
1283 goto out;
1284 }
1285
1286 copy_verf(new, &verf);
1287 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1288 new->cl_addr = ip_addr;
1289 gen_clid(new);
1290 gen_confirm(new);
1291 add_to_unconfirmed(new, strhashval);
1292out_copy:
1293 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1294 exid->clientid.cl_id = new->cl_clientid.cl_id;
1295
38eb76a5
AA		 1296 new->cl_slot.sl_seqid = 0;
1297 exid->seqid = 1;
0733d213
AA		 1298 nfsd4_set_ex_flags(new, exid);
1299
1300 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
38eb76a5 1301 new->cl_slot.sl_seqid, new->cl_exchange_flags);
0733d213
AA		 1302 status = nfs_ok;
1303
1304out:
1305 nfs4_unlock_state();
1306error:
1307 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1308 return status;
069b6ad4
AA		 1309}
1310
b85d4c01
BH		 1311static int
1312check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
1313{
1314 dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
1315 slot->sl_seqid);
1316
1317 /* The slot is in use, and no response has been sent. */
1318 if (slot->sl_inuse) {
1319 if (seqid == slot->sl_seqid)
1320 return nfserr_jukebox;
1321 else
1322 return nfserr_seq_misordered;
1323 }
1324 /* Normal */
1325 if (likely(seqid == slot->sl_seqid + 1))
1326 return nfs_ok;
1327 /* Replay */
1328 if (seqid == slot->sl_seqid)
1329 return nfserr_replay_cache;
1330 /* Wraparound */
1331 if (seqid == 1 && (slot->sl_seqid + 1) == 0)
1332 return nfs_ok;
1333 /* Misordered replay or misordered new request */
1334 return nfserr_seq_misordered;
1335}
1336
069b6ad4
AA		 1337__be32
1338nfsd4_create_session(struct svc_rqst *rqstp,
1339 struct nfsd4_compound_state *cstate,
1340 struct nfsd4_create_session *cr_ses)
1341{
ec6b5d7b 1342 u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
38eb76a5 1343 struct nfsd4_compoundres *resp = rqstp->rq_resp;
ec6b5d7b 1344 struct nfs4_client *conf, *unconf;
38eb76a5 1345 struct nfsd4_slot *slot = NULL;
ec6b5d7b
AA		 1346 int status = 0;
1347
1348 nfs4_lock_state();
1349 unconf = find_unconfirmed_client(&cr_ses->clientid);
1350 conf = find_confirmed_client(&cr_ses->clientid);
1351
1352 if (conf) {
38eb76a5
AA		 1353 slot = &conf->cl_slot;
1354 status = check_slot_seqid(cr_ses->seqid, slot);
1355 if (status == nfserr_replay_cache) {
ec6b5d7b 1356 dprintk("Got a create_session replay! seqid= %d\n",
38eb76a5
AA		 1357 slot->sl_seqid);
1358 cstate->slot = slot;
1359 cstate->status = status;
1360 /* Return the cached reply status */
bf864a31 1361 status = nfsd4_replay_cache_entry(resp, NULL);
38eb76a5
AA		 1362 goto out;
1363 } else if (cr_ses->seqid != conf->cl_slot.sl_seqid + 1) {
ec6b5d7b
AA		 1364 status = nfserr_seq_misordered;
1365 dprintk("Sequence misordered!\n");
1366 dprintk("Expected seqid= %d but got seqid= %d\n",
38eb76a5 1367 slot->sl_seqid, cr_ses->seqid);
ec6b5d7b
AA		 1368 goto out;
1369 }
38eb76a5 1370 conf->cl_slot.sl_seqid++;
ec6b5d7b
AA		 1371 } else if (unconf) {
1372 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1373 (ip_addr != unconf->cl_addr)) {
1374 status = nfserr_clid_inuse;
1375 goto out;
1376 }
1377
38eb76a5
AA		 1378 slot = &unconf->cl_slot;
1379 status = check_slot_seqid(cr_ses->seqid, slot);
1380 if (status) {
1381 /* an unconfirmed replay returns misordered */
ec6b5d7b
AA		 1382 status = nfserr_seq_misordered;
1383 goto out;
1384 }
1385
38eb76a5 1386 slot->sl_seqid++; /* from 0 to 1 */
ec6b5d7b
AA		 1387 move_to_confirmed(unconf);
1388
1389 /*
1390 * We do not support RDMA or persistent sessions
1391 */
1392 cr_ses->flags &= ~SESSION4_PERSIST;
1393 cr_ses->flags &= ~SESSION4_RDMA;
1394
1395 conf = unconf;
1396 } else {
1397 status = nfserr_stale_clientid;
1398 goto out;
1399 }
1400
1401 status = alloc_init_session(rqstp, conf, cr_ses);
1402 if (status)
1403 goto out;
1404
ec6b5d7b
AA		 1405 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1406 NFS4_MAX_SESSIONID_LEN);
38eb76a5 1407 cr_ses->seqid = slot->sl_seqid;
ec6b5d7b 1408
38eb76a5
AA		 1409 slot->sl_inuse = true;
1410 cstate->slot = slot;
bf864a31
AA		 1411 /* Ensure a page is used for the cache */
1412 slot->sl_cache_entry.ce_cachethis = 1;
ec6b5d7b
AA		 1413out:
1414 nfs4_unlock_state();
1415 dprintk("%s returns %d\n", __func__, ntohl(status));
1416 return status;
069b6ad4
AA		 1417}
1418
1419__be32
1420nfsd4_destroy_session(struct svc_rqst *r,
1421 struct nfsd4_compound_state *cstate,
1422 struct nfsd4_destroy_session *sessionid)
1423{
e10e0cfc
BH		 1424 struct nfsd4_session *ses;
1425 u32 status = nfserr_badsession;
1426
1427 /* Notes:
1428 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1429 * - Should we return nfserr_back_chan_busy if waiting for
1430 * callbacks on to-be-destroyed session?
1431 * - Do we need to clear any callback info from previous session?
1432 */
1433
1434 dump_sessionid(__func__, &sessionid->sessionid);
1435 spin_lock(&sessionid_lock);
1436 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1437 if (!ses) {
1438 spin_unlock(&sessionid_lock);
1439 goto out;
1440 }
1441
1442 unhash_session(ses);
1443 spin_unlock(&sessionid_lock);
1444
1445 /* wait for callbacks */
1446 shutdown_callback_client(ses->se_client);
1447 nfsd4_put_session(ses);
1448 status = nfs_ok;
1449out:
1450 dprintk("%s returns %d\n", __func__, ntohl(status));
1451 return status;
069b6ad4
AA		 1452}
1453
1454__be32
b85d4c01 1455nfsd4_sequence(struct svc_rqst *rqstp,
069b6ad4
AA		 1456 struct nfsd4_compound_state *cstate,
1457 struct nfsd4_sequence *seq)
1458{
f9bb94c4 1459 struct nfsd4_compoundres *resp = rqstp->rq_resp;
b85d4c01
BH		 1460 struct nfsd4_session *session;
1461 struct nfsd4_slot *slot;
1462 int status;
1463
f9bb94c4
AA		 1464 if (resp->opcnt != 1)
1465 return nfserr_sequence_pos;
1466
b85d4c01
BH		 1467 spin_lock(&sessionid_lock);
1468 status = nfserr_badsession;
1469 session = find_in_sessionid_hashtbl(&seq->sessionid);
1470 if (!session)
1471 goto out;
1472
1473 status = nfserr_badslot;
6c18ba9f 1474 if (seq->slotid >= session->se_fchannel.maxreqs)
b85d4c01
BH		 1475 goto out;
1476
1477 slot = &session->se_slots[seq->slotid];
1478 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1479
1480 status = check_slot_seqid(seq->seqid, slot);
1481 if (status == nfserr_replay_cache) {
1482 cstate->slot = slot;
1483 cstate->session = session;
da3846a2 1484 /* Return the cached reply status and set cstate->status
bf864a31
AA		 1485 * for nfsd4_svc_encode_compoundres processing */
1486 status = nfsd4_replay_cache_entry(resp, seq);
da3846a2 1487 cstate->status = nfserr_replay_cache;
b85d4c01
BH		 1488 goto replay_cache;
1489 }
1490 if (status)
1491 goto out;
1492
1493 /* Success! bump slot seqid */
1494 slot->sl_inuse = true;
1495 slot->sl_seqid = seq->seqid;
bf864a31
AA		 1496 slot->sl_cache_entry.ce_cachethis = seq->cachethis;
1497 /* Always set the cache entry cachethis for solo sequence */
1498 if (nfsd4_is_solo_sequence(resp))
1499 slot->sl_cache_entry.ce_cachethis = 1;
b85d4c01
BH		 1500
1501 cstate->slot = slot;
1502 cstate->session = session;
1503
1504replay_cache:
1505 /* Renew the clientid on success and on replay.
1506 * Hold a session reference until done processing the compound:
1507 * nfsd4_put_session called only if the cstate slot is set.
1508 */
1509 renew_client(session->se_client);
1510 nfsd4_get_session(session);
1511out:
1512 spin_unlock(&sessionid_lock);
1513 dprintk("%s: return %d\n", __func__, ntohl(status));
1514 return status;
069b6ad4
AA		 1515}
1516
b37ad28b 1517__be32
b591480b
BF		 1518nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1519 struct nfsd4_setclientid *setclid)
1da177e4 1520{
27459f09 1521 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 1522 struct xdr_netobj clname = {
1523 .len = setclid->se_namelen,
1524 .data = setclid->se_name,
1525 };
1526 nfs4_verifier clverifier = setclid->se_verf;
1527 unsigned int strhashval;
28ce6054 1528 struct nfs4_client *conf, *unconf, *new;
b37ad28b 1529 __be32 status;
68e76ad0 1530 char *princ;
a55370a3 1531 char dname[HEXDIR_LEN];
1da177e4 1532
1da177e4 1533 if (!check_name(clname))
73aea4ec 1534 return nfserr_inval;
1da177e4 1535
a55370a3
N		 1536 status = nfs4_make_rec_clidname(dname, &clname);
1537 if (status)
73aea4ec 1538 return status;
a55370a3 1539
1da177e4
LT		 1540 /*
1541 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1542 * We get here on a DRC miss.
1543 */
1544
a55370a3 1545 strhashval = clientstr_hashval(dname);
1da177e4 1546
1da177e4 1547 nfs4_lock_state();
a1bcecd2 1548 conf = find_confirmed_client_by_str(dname, strhashval, false);
28ce6054 1549 if (conf) {
a186e767 1550 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 1551 status = nfserr_clid_inuse;
026722c2
BF		 1552 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1553 dprintk("NFSD: setclientid: string in use by client"
1554 " at %pI4\n", &conf->cl_addr);
1da177e4
LT		 1555 goto out;
1556 }
1da177e4 1557 }
a186e767
BF		 1558 /*
1559 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1560 * has a description of SETCLIENTID request processing consisting
1561 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1562 */
a1bcecd2 1563 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1da177e4
LT		 1564 status = nfserr_resource;
1565 if (!conf) {
a186e767
BF		 1566 /*
1567 * RFC 3530 14.2.33 CASE 4:
1568 * placed first, because it is the normal case
1da177e4
LT		 1569 */
1570 if (unconf)
1571 expire_client(unconf);
a55370a3
N		 1572 new = create_client(clname, dname);
1573 if (new == NULL)
1da177e4 1574 goto out;
1da177e4 1575 gen_clid(new);
599e0a22 1576 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 1577 /*
a186e767
BF		 1578 * RFC 3530 14.2.33 CASE 1:
1579 * probable callback update
1da177e4 1580 */
31f4a6c1
N		 1581 if (unconf) {
1582 /* Note this is removing unconfirmed {*x***},
1583 * which is stronger than RFC recommended {vxc**}.
1584 * This has the advantage that there is at most
1585 * one {*x***} in either list at any time.
1586 */
1587 expire_client(unconf);
1da177e4 1588 }
a55370a3
N		 1589 new = create_client(clname, dname);
1590 if (new == NULL)
1da177e4 1591 goto out;
1da177e4 1592 copy_clid(new, conf);
1da177e4
LT		 1593 } else if (!unconf) {
1594 /*
a186e767
BF		 1595 * RFC 3530 14.2.33 CASE 2:
1596 * probable client reboot; state will be removed if
1597 * confirmed.
1da177e4 1598 */
a55370a3
N		 1599 new = create_client(clname, dname);
1600 if (new == NULL)
1da177e4 1601 goto out;
1da177e4 1602 gen_clid(new);
49ba8781 1603 } else {
a186e767
BF		 1604 /*
1605 * RFC 3530 14.2.33 CASE 3:
1606 * probable client reboot; state will be removed if
1607 * confirmed.
1da177e4
LT		 1608 */
1609 expire_client(unconf);
a55370a3
N		 1610 new = create_client(clname, dname);
1611 if (new == NULL)
1da177e4 1612 goto out;
1da177e4 1613 gen_clid(new);
1da177e4 1614 }
c175b83c
BF		 1615 copy_verf(new, &clverifier);
1616 new->cl_addr = sin->sin_addr.s_addr;
61054b14 1617 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 1618 princ = svc_gss_principal(rqstp);
1619 if (princ) {
1620 new->cl_principal = kstrdup(princ, GFP_KERNEL);
1621 if (new->cl_principal == NULL) {
1622 free_client(new);
1623 goto out;
1624 }
1625 }
c175b83c
BF		 1626 copy_cred(&new->cl_cred, &rqstp->rq_cred);
1627 gen_confirm(new);
1628 gen_callback(new, setclid);
1629 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 1630 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1631 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1632 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1633 status = nfs_ok;
1634out:
1635 nfs4_unlock_state();
1636 return status;
1637}
1638
1639
1640/*
a186e767
BF		 1641 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1642 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1643 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 1644 */
b37ad28b 1645__be32
b591480b
BF		 1646nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1647 struct nfsd4_compound_state *cstate,
1648 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 1649{
27459f09 1650 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 1651 struct nfs4_client *conf, *unconf;
1da177e4
LT		 1652 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1653 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 1654 __be32 status;
1da177e4
LT		 1655
1656 if (STALE_CLIENTID(clid))
1657 return nfserr_stale_clientid;
1658 /*
1659 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1660 * We get here on a DRC miss.
1661 */
1662
1663 nfs4_lock_state();
21ab45a4
N		 1664
1665 conf = find_confirmed_client(clid);
1666 unconf = find_unconfirmed_client(clid);
1667
1668 status = nfserr_clid_inuse;
27459f09 1669 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 1670 goto out;
27459f09 1671 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 1672 goto out;
1673
a186e767
BF		 1674 /*
1675 * section 14.2.34 of RFC 3530 has a description of
1676 * SETCLIENTID_CONFIRM request processing consisting
1677 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1678 */
366e0c1d 1679 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 1680 /*
1681 * RFC 3530 14.2.34 CASE 1:
1682 * callback update
1683 */
599e0a22 1684 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 1685 status = nfserr_clid_inuse;
1686 else {
1a69c179
N		 1687 /* XXX: We just turn off callbacks until we can handle
1688 * change request correctly. */
c237dc03 1689 atomic_set(&conf->cl_cb_conn.cb_set, 0);
1a69c179 1690 expire_client(unconf);
1da177e4 1691 status = nfs_ok;
1a69c179 1692
1da177e4 1693 }
f3aba4e5 1694 } else if (conf && !unconf) {
a186e767
BF		 1695 /*
1696 * RFC 3530 14.2.34 CASE 2:
1697 * probable retransmitted request; play it safe and
1698 * do nothing.
7c79f737 1699 */
599e0a22 1700 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 1701 status = nfserr_clid_inuse;
21ab45a4 1702 else
1da177e4 1703 status = nfs_ok;
7c79f737 1704 } else if (!conf && unconf
599e0a22 1705 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 1706 /*
1707 * RFC 3530 14.2.34 CASE 3:
1708 * Normal case; new or rebooted client:
7c79f737 1709 */
599e0a22 1710 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 1711 status = nfserr_clid_inuse;
1712 } else {
1a69c179
N		 1713 unsigned int hash =
1714 clientstr_hashval(unconf->cl_recdir);
1715 conf = find_confirmed_client_by_str(unconf->cl_recdir,
a1bcecd2 1716 hash, false);
1a69c179 1717 if (conf) {
c7b9a459 1718 nfsd4_remove_clid_dir(conf);
1a69c179
N		 1719 expire_client(conf);
1720 }
1da177e4 1721 move_to_confirmed(unconf);
21ab45a4 1722 conf = unconf;
46f8a64b 1723 nfsd4_probe_callback(conf);
1a69c179 1724 status = nfs_ok;
1da177e4 1725 }
599e0a22
BF		 1726 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1727 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 1728 &confirm)))) {
a186e767
BF		 1729 /*
1730 * RFC 3530 14.2.34 CASE 4:
1731 * Client probably hasn't noticed that we rebooted yet.
7c79f737 1732 */
1da177e4 1733 status = nfserr_stale_clientid;
7c79f737 1734 } else {
08e8987c
N		 1735 /* check that we have hit one of the cases...*/
1736 status = nfserr_clid_inuse;
1737 }
1da177e4 1738out:
1da177e4
LT		 1739 nfs4_unlock_state();
1740 return status;
1741}
1742
1da177e4
LT		 1743/* OPEN Share state helper functions */
1744static inline struct nfs4_file *
1745alloc_init_file(struct inode *ino)
1746{
1747 struct nfs4_file *fp;
1748 unsigned int hashval = file_hashval(ino);
1749
e60d4398
N		 1750 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1751 if (fp) {
8b671b80 1752 atomic_set(&fp->fi_ref, 1);
1da177e4 1753 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1754 INIT_LIST_HEAD(&fp->fi_stateids);
1755 INIT_LIST_HEAD(&fp->fi_delegations);
8b671b80 1756 spin_lock(&recall_lock);
1da177e4 1757 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
8b671b80 1758 spin_unlock(&recall_lock);
1da177e4
LT		 1759 fp->fi_inode = igrab(ino);
1760 fp->fi_id = current_fileid++;
47f9940c 1761 fp->fi_had_conflict = false;
1da177e4
LT		 1762 return fp;
1763 }
1764 return NULL;
1765}
1766
e60d4398 1767static void
e18b890b 1768nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1769{
e60d4398
N		 1770 if (*slab == NULL)
1771 return;
1a1d92c1 1772 kmem_cache_destroy(*slab);
e60d4398 1773 *slab = NULL;
1da177e4
LT		 1774}
1775
e8ff2a84 1776void
1da177e4
LT		 1777nfsd4_free_slabs(void)
1778{
e60d4398
N		 1779 nfsd4_free_slab(&stateowner_slab);
1780 nfsd4_free_slab(&file_slab);
5ac049ac 1781 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1782 nfsd4_free_slab(&deleg_slab);
e60d4398 1783}
1da177e4 1784
e60d4398
N		 1785static int
1786nfsd4_init_slabs(void)
1787{
1788 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1789 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1790 if (stateowner_slab == NULL)
1791 goto out_nomem;
1792 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1793 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1794 if (file_slab == NULL)
1795 goto out_nomem;
5ac049ac 1796 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1797 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1798 if (stateid_slab == NULL)
1799 goto out_nomem;
5b2d21c1 1800 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1801 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1802 if (deleg_slab == NULL)
1803 goto out_nomem;
e60d4398
N		 1804 return 0;
1805out_nomem:
1806 nfsd4_free_slabs();
1807 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1808 return -ENOMEM;
1da177e4
LT		 1809}
1810
1811void
1812nfs4_free_stateowner(struct kref *kref)
1813{
1814 struct nfs4_stateowner *sop =
1815 container_of(kref, struct nfs4_stateowner, so_ref);
1816 kfree(sop->so_owner.data);
1817 kmem_cache_free(stateowner_slab, sop);
1818}
1819
1820static inline struct nfs4_stateowner *
1821alloc_stateowner(struct xdr_netobj *owner)
1822{
1823 struct nfs4_stateowner *sop;
1824
1825 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1826 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1827 memcpy(sop->so_owner.data, owner->data, owner->len);
1828 sop->so_owner.len = owner->len;
1829 kref_init(&sop->so_ref);
1830 return sop;
1831 }
1832 kmem_cache_free(stateowner_slab, sop);
1833 }
1834 return NULL;
1835}
1836
1837static struct nfs4_stateowner *
1838alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1839 struct nfs4_stateowner *sop;
1840 struct nfs4_replay *rp;
1841 unsigned int idhashval;
1842
1843 if (!(sop = alloc_stateowner(&open->op_owner)))
1844 return NULL;
1845 idhashval = ownerid_hashval(current_ownerid);
1846 INIT_LIST_HEAD(&sop->so_idhash);
1847 INIT_LIST_HEAD(&sop->so_strhash);
1848 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1849 INIT_LIST_HEAD(&sop->so_stateids);
1850 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1851 INIT_LIST_HEAD(&sop->so_close_lru);
1852 sop->so_time = 0;
1853 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1854 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1855 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1856 sop->so_is_open_owner = 1;
1857 sop->so_id = current_ownerid++;
1858 sop->so_client = clp;
1859 sop->so_seqid = open->op_seqid;
1860 sop->so_confirmed = 0;
1861 rp = &sop->so_replay;
de1ae286 1862 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1863 rp->rp_buflen = 0;
1864 rp->rp_buf = rp->rp_ibuf;
1865 return sop;
1866}
1867
1da177e4
LT		 1868static inline void
1869init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1870 struct nfs4_stateowner *sop = open->op_stateowner;
1871 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1872
1873 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1874 INIT_LIST_HEAD(&stp->st_perstateowner);
1875 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1876 INIT_LIST_HEAD(&stp->st_perfile);
1877 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1878 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1879 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1880 stp->st_stateowner = sop;
13cd2184 1881 get_nfs4_file(fp);
1da177e4 1882 stp->st_file = fp;
78155ed7 1883 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 1884 stp->st_stateid.si_stateownerid = sop->so_id;
1885 stp->st_stateid.si_fileid = fp->fi_id;
1886 stp->st_stateid.si_generation = 0;
1887 stp->st_access_bmap = 0;
1888 stp->st_deny_bmap = 0;
84459a11
AA		 1889 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
1890 &stp->st_access_bmap);
1da177e4 1891 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1892 stp->st_openstp = NULL;
1da177e4
LT		 1893}
1894
fd39ca9a 1895static void
1da177e4
LT		 1896move_to_close_lru(struct nfs4_stateowner *sop)
1897{
1898 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1899
358dd55a 1900 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1901 sop->so_time = get_seconds();
1902}
1903
1da177e4 1904static int
599e0a22
BF		 1905same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1906 clientid_t *clid)
1907{
1908 return (sop->so_owner.len == owner->len) &&
1909 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1910 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1911}
1912
1913static struct nfs4_stateowner *
1914find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1915{
1916 struct nfs4_stateowner *so = NULL;
1917
1918 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1919 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1920 return so;
1921 }
1922 return NULL;
1923}
1924
1925/* search file_hashtbl[] for file */
1926static struct nfs4_file *
1927find_file(struct inode *ino)
1928{
1929 unsigned int hashval = file_hashval(ino);
1930 struct nfs4_file *fp;
1931
8b671b80 1932 spin_lock(&recall_lock);
1da177e4 1933 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1934 if (fp->fi_inode == ino) {
1935 get_nfs4_file(fp);
8b671b80 1936 spin_unlock(&recall_lock);
1da177e4 1937 return fp;
13cd2184 1938 }
1da177e4 1939 }
8b671b80 1940 spin_unlock(&recall_lock);
1da177e4
LT		 1941 return NULL;
1942}
1943
d87a8ade 1944static inline int access_valid(u32 x, u32 minorversion)
ba5a6a19 1945{
d87a8ade 1946 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
8838dc43 1947 return 0;
d87a8ade
AA		 1948 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
1949 return 0;
1950 x &= ~NFS4_SHARE_ACCESS_MASK;
1951 if (minorversion && x) {
1952 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
1953 return 0;
1954 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
1955 return 0;
1956 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
1957 }
1958 if (x)
8838dc43
BF		 1959 return 0;
1960 return 1;
ba5a6a19
BF		 1961}
1962
8838dc43 1963static inline int deny_valid(u32 x)
ba5a6a19 1964{
8838dc43
BF		 1965 /* Note: unlike access bits, deny bits may be zero. */
1966 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1967}
1da177e4 1968
4f83aa30
BF		 1969/*
1970 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1971 * st_{access,deny}_bmap field of the stateid, in order to track not
1972 * only what share bits are currently in force, but also what
1973 * combinations of share bits previous opens have used. This allows us
1974 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1975 * return an error if the client attempt to downgrade to a combination
1976 * of share bits not explicable by closing some of its previous opens.
1977 *
1978 * XXX: This enforcement is actually incomplete, since we don't keep
1979 * track of access/deny bit combinations; so, e.g., we allow:
1980 *
1981 * OPEN allow read, deny write
1982 * OPEN allow both, deny none
1983 * DOWNGRADE allow read, deny none
1984 *
1985 * which we should reject.
1986 */
fd39ca9a 1987static void
1da177e4
LT		 1988set_access(unsigned int *access, unsigned long bmap) {
1989 int i;
1990
1991 *access = 0;
1992 for (i = 1; i < 4; i++) {
1993 if (test_bit(i, &bmap))
1994 *access |= i;
1995 }
1996}
1997
fd39ca9a 1998static void
1da177e4
LT		 1999set_deny(unsigned int *deny, unsigned long bmap) {
2000 int i;
2001
2002 *deny = 0;
2003 for (i = 0; i < 4; i++) {
2004 if (test_bit(i, &bmap))
2005 *deny |= i ;
2006 }
2007}
2008
2009static int
2010test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
2011 unsigned int access, deny;
2012
2013 set_access(&access, stp->st_access_bmap);
2014 set_deny(&deny, stp->st_deny_bmap);
2015 if ((access & open->op_share_deny) || (deny & open->op_share_access))
2016 return 0;
2017 return 1;
2018}
2019
2020/*
2021 * Called to check deny when READ with all zero stateid or
2022 * WRITE with all zero or all one stateid
2023 */
b37ad28b 2024static __be32
1da177e4
LT		 2025nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2026{
2027 struct inode *ino = current_fh->fh_dentry->d_inode;
2028 struct nfs4_file *fp;
2029 struct nfs4_stateid *stp;
b37ad28b 2030 __be32 ret;
1da177e4
LT		 2031
2032 dprintk("NFSD: nfs4_share_conflict\n");
2033
2034 fp = find_file(ino);
13cd2184
N		 2035 if (!fp)
2036 return nfs_ok;
b700949b 2037 ret = nfserr_locked;
1da177e4 2038 /* Search for conflicting share reservations */
13cd2184
N		 2039 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2040 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2041 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2042 goto out;
1da177e4 2043 }
13cd2184
N		 2044 ret = nfs_ok;
2045out:
2046 put_nfs4_file(fp);
2047 return ret;
1da177e4
LT		 2048}
2049
2050static inline void
2051nfs4_file_downgrade(struct file *filp, unsigned int share_access)
2052{
2053 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 2054 drop_file_write_access(filp);
1da177e4
LT		 2055 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
2056 }
2057}
2058
1da177e4
LT		 2059/*
2060 * Spawn a thread to perform a recall on the delegation represented
2061 * by the lease (file_lock)
2062 *
2063 * Called from break_lease() with lock_kernel() held.
2064 * Note: we assume break_lease will only call this *once* for any given
2065 * lease.
2066 */
2067static
2068void nfsd_break_deleg_cb(struct file_lock *fl)
2069{
63e4863f 2070 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1da177e4
LT		 2071
2072 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2073 if (!dp)
2074 return;
2075
2076 /* We're assuming the state code never drops its reference
2077 * without first removing the lease. Since we're in this lease
2078 * callback (and since the lease code is serialized by the kernel
2079 * lock) we know the server hasn't removed the lease yet, we know
2080 * it's safe to take a reference: */
2081 atomic_inc(&dp->dl_count);
cfdcad4d 2082 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 2083
2084 spin_lock(&recall_lock);
2085 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2086 spin_unlock(&recall_lock);
2087
2088 /* only place dl_time is set. protected by lock_kernel*/
2089 dp->dl_time = get_seconds();
2090
0272e1fd
BF		 2091 /*
2092 * We don't want the locks code to timeout the lease for us;
2093 * we'll remove it ourself if the delegation isn't returned
2094 * in time.
2095 */
2096 fl->fl_break_time = 0;
1da177e4 2097
63e4863f
BF		 2098 dp->dl_file->fi_had_conflict = true;
2099 nfsd4_cb_recall(dp);
1da177e4
LT		 2100}
2101
2102/*
2103 * The file_lock is being reapd.
2104 *
2105 * Called by locks_free_lock() with lock_kernel() held.
2106 */
2107static
2108void nfsd_release_deleg_cb(struct file_lock *fl)
2109{
2110 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2111
2112 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2113
2114 if (!(fl->fl_flags & FL_LEASE) || !dp)
2115 return;
2116 dp->dl_flock = NULL;
2117}
2118
2119/*
2120 * Set the delegation file_lock back pointer.
2121 *
a9933cea 2122 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 2123 */
2124static
2125void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2126{
2127 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2128
2129 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2130 if (!dp)
2131 return;
2132 dp->dl_flock = new;
2133}
2134
2135/*
a9933cea 2136 * Called from setlease() with lock_kernel() held
1da177e4
LT		 2137 */
2138static
2139int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2140{
2141 struct nfs4_delegation *onlistd =
2142 (struct nfs4_delegation *)onlist->fl_owner;
2143 struct nfs4_delegation *tryd =
2144 (struct nfs4_delegation *)try->fl_owner;
2145
2146 if (onlist->fl_lmops != try->fl_lmops)
2147 return 0;
2148
2149 return onlistd->dl_client == tryd->dl_client;
2150}
2151
2152
2153static
2154int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2155{
2156 if (arg & F_UNLCK)
2157 return lease_modify(onlist, arg);
2158 else
2159 return -EAGAIN;
2160}
2161
fd39ca9a 2162static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 2163 .fl_break = nfsd_break_deleg_cb,
2164 .fl_release_private = nfsd_release_deleg_cb,
2165 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2166 .fl_mylease = nfsd_same_client_deleg_cb,
2167 .fl_change = nfsd_change_deleg_cb,
2168};
2169
2170
b37ad28b 2171__be32
6668958f
AA		 2172nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2173 struct nfsd4_open *open)
1da177e4 2174{
1da177e4
LT		 2175 clientid_t *clientid = &open->op_clientid;
2176 struct nfs4_client *clp = NULL;
2177 unsigned int strhashval;
2178 struct nfs4_stateowner *sop = NULL;
2179
1da177e4 2180 if (!check_name(open->op_owner))
0f442aa2 2181 return nfserr_inval;
1da177e4
LT		 2182
2183 if (STALE_CLIENTID(&open->op_clientid))
2184 return nfserr_stale_clientid;
2185
2186 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2187 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 2188 open->op_stateowner = sop;
2189 if (!sop) {
2190 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 2191 clp = find_confirmed_client(clientid);
2192 if (clp == NULL)
0f442aa2
BF		 2193 return nfserr_expired;
2194 goto renew;
1da177e4 2195 }
6668958f
AA		 2196 /* When sessions are used, skip open sequenceid processing */
2197 if (nfsd4_has_session(cstate))
2198 goto renew;
0f442aa2
BF		 2199 if (!sop->so_confirmed) {
2200 /* Replace unconfirmed owners without checking for replay. */
2201 clp = sop->so_client;
f044ff83 2202 release_openowner(sop);
0f442aa2
BF		 2203 open->op_stateowner = NULL;
2204 goto renew;
2205 }
2206 if (open->op_seqid == sop->so_seqid - 1) {
2207 if (sop->so_replay.rp_buflen)
a90b061c 2208 return nfserr_replay_me;
0f442aa2
BF		 2209 /* The original OPEN failed so spectacularly
2210 * that we don't even have replay data saved!
2211 * Therefore, we have no choice but to continue
2212 * processing this OPEN; presumably, we'll
2213 * fail again for the same reason.
2214 */
2215 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2216 goto renew;
2217 }
2218 if (open->op_seqid != sop->so_seqid)
2219 return nfserr_bad_seqid;
1da177e4 2220renew:
0f442aa2
BF		 2221 if (open->op_stateowner == NULL) {
2222 sop = alloc_init_open_stateowner(strhashval, clp, open);
2223 if (sop == NULL)
2224 return nfserr_resource;
2225 open->op_stateowner = sop;
2226 }
2227 list_del_init(&sop->so_close_lru);
1da177e4 2228 renew_client(sop->so_client);
0f442aa2 2229 return nfs_ok;
1da177e4
LT		 2230}
2231
b37ad28b 2232static inline __be32
4a6e43e6
N		 2233nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2234{
2235 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2236 return nfserr_openmode;
2237 else
2238 return nfs_ok;
2239}
2240
52f4fb43
N		 2241static struct nfs4_delegation *
2242find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2243{
2244 struct nfs4_delegation *dp;
2245
ea1da636 2246 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 2247 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2248 return dp;
2249 }
2250 return NULL;
2251}
2252
b37ad28b 2253static __be32
567d9829
N		 2254nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2255 struct nfs4_delegation **dp)
2256{
2257 int flags;
b37ad28b 2258 __be32 status = nfserr_bad_stateid;
567d9829
N		 2259
2260 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2261 if (*dp == NULL)
c44c5eeb 2262 goto out;
567d9829
N		 2263 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2264 RD_STATE : WR_STATE;
2265 status = nfs4_check_delegmode(*dp, flags);
2266 if (status)
2267 *dp = NULL;
c44c5eeb
N		 2268out:
2269 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2270 return nfs_ok;
2271 if (status)
2272 return status;
2273 open->op_stateowner->so_confirmed = 1;
2274 return nfs_ok;
567d9829
N		 2275}
2276
b37ad28b 2277static __be32
1da177e4
LT		 2278nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2279{
2280 struct nfs4_stateid *local;
b37ad28b 2281 __be32 status = nfserr_share_denied;
1da177e4
LT		 2282 struct nfs4_stateowner *sop = open->op_stateowner;
2283
8beefa24 2284 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 2285 /* ignore lock owners */
2286 if (local->st_stateowner->so_is_open_owner == 0)
2287 continue;
2288 /* remember if we have seen this open owner */
2289 if (local->st_stateowner == sop)
2290 *stpp = local;
2291 /* check for conflicting share reservations */
2292 if (!test_share(local, open))
2293 goto out;
2294 }
2295 status = 0;
2296out:
2297 return status;
2298}
2299
5ac049ac
N		 2300static inline struct nfs4_stateid *
2301nfs4_alloc_stateid(void)
2302{
2303 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2304}
2305
b37ad28b 2306static __be32
1da177e4 2307nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 2308 struct nfs4_delegation *dp,
1da177e4
LT		 2309 struct svc_fh *cur_fh, int flags)
2310{
2311 struct nfs4_stateid *stp;
1da177e4 2312
5ac049ac 2313 stp = nfs4_alloc_stateid();
1da177e4
LT		 2314 if (stp == NULL)
2315 return nfserr_resource;
2316
567d9829
N		 2317 if (dp) {
2318 get_file(dp->dl_vfs_file);
2319 stp->st_vfs_file = dp->dl_vfs_file;
2320 } else {
b37ad28b 2321 __be32 status;
567d9829
N		 2322 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2323 &stp->st_vfs_file);
2324 if (status) {
2325 if (status == nfserr_dropit)
2326 status = nfserr_jukebox;
5ac049ac 2327 kmem_cache_free(stateid_slab, stp);
567d9829
N		 2328 return status;
2329 }
1da177e4 2330 }
1da177e4
LT		 2331 *stpp = stp;
2332 return 0;
2333}
2334
b37ad28b 2335static inline __be32
1da177e4
LT		 2336nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2337 struct nfsd4_open *open)
2338{
2339 struct iattr iattr = {
2340 .ia_valid = ATTR_SIZE,
2341 .ia_size = 0,
2342 };
2343 if (!open->op_truncate)
2344 return 0;
2345 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 2346 return nfserr_inval;
1da177e4
LT		 2347 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2348}
2349
b37ad28b 2350static __be32
1da177e4
LT		 2351nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2352{
2353 struct file *filp = stp->st_vfs_file;
7eaa36e2 2354 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 2355 unsigned int share_access, new_writer;
b37ad28b 2356 __be32 status;
1da177e4
LT		 2357
2358 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 2359 new_writer = (~share_access) & open->op_share_access
2360 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 2361
6c26d08f 2362 if (new_writer) {
b37ad28b
AV		 2363 int err = get_write_access(inode);
2364 if (err)
2365 return nfserrno(err);
e518f056
BH		 2366 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2367 if (err)
2368 return nfserrno(err);
2369 file_take_write(filp);
6c26d08f 2370 }
1da177e4
LT		 2371 status = nfsd4_truncate(rqstp, cur_fh, open);
2372 if (status) {
6c26d08f
BF		 2373 if (new_writer)
2374 put_write_access(inode);
1da177e4
LT		 2375 return status;
2376 }
2377 /* remember the open */
6c26d08f 2378 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 2379 __set_bit(open->op_share_access, &stp->st_access_bmap);
2380 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 2381
2382 return nfs_ok;
2383}
2384
2385
1da177e4 2386static void
37515177 2387nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 2388{
37515177
N		 2389 open->op_stateowner->so_confirmed = 1;
2390 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 2391}
2392
2393/*
2394 * Attempt to hand out a delegation.
2395 */
2396static void
2397nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2398{
2399 struct nfs4_delegation *dp;
2400 struct nfs4_stateowner *sop = stp->st_stateowner;
c237dc03 2401 struct nfs4_cb_conn *cb = &sop->so_client->cl_cb_conn;
1da177e4
LT		 2402 struct file_lock fl, *flp = &fl;
2403 int status, flag = 0;
2404
2405 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 2406 open->op_recall = 0;
2407 switch (open->op_claim_type) {
2408 case NFS4_OPEN_CLAIM_PREVIOUS:
2409 if (!atomic_read(&cb->cb_set))
2410 open->op_recall = 1;
2411 flag = open->op_delegate_type;
2412 if (flag == NFS4_OPEN_DELEGATE_NONE)
2413 goto out;
2414 break;
2415 case NFS4_OPEN_CLAIM_NULL:
2416 /* Let's not give out any delegations till everyone's
2417 * had the chance to reclaim theirs.... */
af558e33 2418 if (locks_in_grace())
7b190fec
N		 2419 goto out;
2420 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
2421 goto out;
2422 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2423 flag = NFS4_OPEN_DELEGATE_WRITE;
2424 else
2425 flag = NFS4_OPEN_DELEGATE_READ;
2426 break;
2427 default:
2428 goto out;
2429 }
1da177e4
LT		 2430
2431 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2432 if (dp == NULL) {
2433 flag = NFS4_OPEN_DELEGATE_NONE;
2434 goto out;
2435 }
2436 locks_init_lock(&fl);
2437 fl.fl_lmops = &nfsd_lease_mng_ops;
2438 fl.fl_flags = FL_LEASE;
9167f501 2439 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 2440 fl.fl_end = OFFSET_MAX;
2441 fl.fl_owner = (fl_owner_t)dp;
2442 fl.fl_file = stp->st_vfs_file;
2443 fl.fl_pid = current->tgid;
2444
a9933cea 2445 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 2446 * the lock_manager callbacks fl_mylease and fl_change are used
2447 */
9167f501 2448 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 2449 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 2450 unhash_delegation(dp);
1da177e4
LT		 2451 flag = NFS4_OPEN_DELEGATE_NONE;
2452 goto out;
2453 }
2454
2455 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2456
2457 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
2458 dp->dl_stateid.si_boot,
2459 dp->dl_stateid.si_stateownerid,
2460 dp->dl_stateid.si_fileid,
2461 dp->dl_stateid.si_generation);
2462out:
7b190fec
N		 2463 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2464 && flag == NFS4_OPEN_DELEGATE_NONE
2465 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 2466 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 2467 open->op_delegate_type = flag;
2468}
2469
2470/*
2471 * called with nfs4_lock_state() held.
2472 */
b37ad28b 2473__be32
1da177e4
LT		 2474nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2475{
6668958f 2476 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1da177e4
LT		 2477 struct nfs4_file *fp = NULL;
2478 struct inode *ino = current_fh->fh_dentry->d_inode;
2479 struct nfs4_stateid *stp = NULL;
567d9829 2480 struct nfs4_delegation *dp = NULL;
b37ad28b 2481 __be32 status;
1da177e4
LT		 2482
2483 status = nfserr_inval;
d87a8ade 2484 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
ba5a6a19 2485 || !deny_valid(open->op_share_deny))
1da177e4
LT		 2486 goto out;
2487 /*
2488 * Lookup file; if found, lookup stateid and check open request,
2489 * and check for delegations in the process of being recalled.
2490 * If not found, create the nfs4_file struct
2491 */
2492 fp = find_file(ino);
2493 if (fp) {
2494 if ((status = nfs4_check_open(fp, open, &stp)))
2495 goto out;
c44c5eeb
N		 2496 status = nfs4_check_deleg(fp, open, &dp);
2497 if (status)
2498 goto out;
1da177e4 2499 } else {
c44c5eeb
N		 2500 status = nfserr_bad_stateid;
2501 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2502 goto out;
1da177e4
LT		 2503 status = nfserr_resource;
2504 fp = alloc_init_file(ino);
2505 if (fp == NULL)
2506 goto out;
2507 }
2508
2509 /*
2510 * OPEN the file, or upgrade an existing OPEN.
2511 * If truncate fails, the OPEN fails.
2512 */
2513 if (stp) {
2514 /* Stateid was found, this is an OPEN upgrade */
2515 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2516 if (status)
2517 goto out;
444c2c07 2518 update_stateid(&stp->st_stateid);
1da177e4
LT		 2519 } else {
2520 /* Stateid was not found, this is a new OPEN */
2521 int flags = 0;
9ecb6a08 2522 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 2523 flags |= NFSD_MAY_READ;
1da177e4 2524 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 2525 flags |= NFSD_MAY_WRITE;
567d9829
N		 2526 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2527 if (status)
1da177e4
LT		 2528 goto out;
2529 init_stateid(stp, fp, open);
2530 status = nfsd4_truncate(rqstp, current_fh, open);
2531 if (status) {
2283963f 2532 release_open_stateid(stp);
1da177e4
LT		 2533 goto out;
2534 }
6668958f
AA		 2535 if (nfsd4_has_session(&resp->cstate))
2536 update_stateid(&stp->st_stateid);
1da177e4
LT		 2537 }
2538 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2539
6668958f
AA		 2540 if (nfsd4_has_session(&resp->cstate))
2541 open->op_stateowner->so_confirmed = 1;
2542
1da177e4
LT		 2543 /*
2544 * Attempt to hand out a delegation. No error return, because the
2545 * OPEN succeeds even if we fail.
2546 */
2547 nfs4_open_delegation(current_fh, open, stp);
2548
2549 status = nfs_ok;
2550
2551 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
2552 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
2553 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
2554out:
13cd2184
N		 2555 if (fp)
2556 put_nfs4_file(fp);
37515177
N		 2557 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2558 nfs4_set_claim_prev(open);
1da177e4
LT		 2559 /*
2560 * To finish the open response, we just need to set the rflags.
2561 */
2562 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
6668958f
AA		 2563 if (!open->op_stateowner->so_confirmed &&
2564 !nfsd4_has_session(&resp->cstate))
1da177e4
LT		 2565 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2566
2567 return status;
2568}
2569
b37ad28b 2570__be32
b591480b
BF		 2571nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2572 clientid_t *clid)
1da177e4
LT		 2573{
2574 struct nfs4_client *clp;
b37ad28b 2575 __be32 status;
1da177e4
LT		 2576
2577 nfs4_lock_state();
2578 dprintk("process_renew(%08x/%08x): starting\n",
2579 clid->cl_boot, clid->cl_id);
2580 status = nfserr_stale_clientid;
2581 if (STALE_CLIENTID(clid))
2582 goto out;
2583 clp = find_confirmed_client(clid);
2584 status = nfserr_expired;
2585 if (clp == NULL) {
2586 /* We assume the client took too long to RENEW. */
2587 dprintk("nfsd4_renew: clientid not found!\n");
2588 goto out;
2589 }
2590 renew_client(clp);
2591 status = nfserr_cb_path_down;
ea1da636 2592 if (!list_empty(&clp->cl_delegations)
c237dc03 2593 && !atomic_read(&clp->cl_cb_conn.cb_set))
1da177e4
LT		 2594 goto out;
2595 status = nfs_ok;
2596out:
2597 nfs4_unlock_state();
2598 return status;
2599}
2600
af558e33
BF		 2601struct lock_manager nfsd4_manager = {
2602};
2603
a76b4319 2604static void
af558e33 2605nfsd4_end_grace(void)
a76b4319
N		 2606{
2607 dprintk("NFSD: end of grace period\n");
c7b9a459 2608 nfsd4_recdir_purge_old();
af558e33 2609 locks_end_grace(&nfsd4_manager);
a76b4319
N		 2610}
2611
fd39ca9a 2612static time_t
1da177e4
LT		 2613nfs4_laundromat(void)
2614{
2615 struct nfs4_client *clp;
2616 struct nfs4_stateowner *sop;
2617 struct nfs4_delegation *dp;
2618 struct list_head *pos, *next, reaplist;
2619 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
2620 time_t t, clientid_val = NFSD_LEASE_TIME;
2621 time_t u, test_val = NFSD_LEASE_TIME;
2622
2623 nfs4_lock_state();
2624
2625 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 2626 if (locks_in_grace())
2627 nfsd4_end_grace();
1da177e4
LT		 2628 list_for_each_safe(pos, next, &client_lru) {
2629 clp = list_entry(pos, struct nfs4_client, cl_lru);
2630 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2631 t = clp->cl_time - cutoff;
2632 if (clientid_val > t)
2633 clientid_val = t;
2634 break;
2635 }
2636 dprintk("NFSD: purging unused client (clientid %08x)\n",
2637 clp->cl_clientid.cl_id);
c7b9a459 2638 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 2639 expire_client(clp);
2640 }
2641 INIT_LIST_HEAD(&reaplist);
2642 spin_lock(&recall_lock);
2643 list_for_each_safe(pos, next, &del_recall_lru) {
2644 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2645 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2646 u = dp->dl_time - cutoff;
2647 if (test_val > u)
2648 test_val = u;
2649 break;
2650 }
2651 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2652 dp, dp->dl_flock);
2653 list_move(&dp->dl_recall_lru, &reaplist);
2654 }
2655 spin_unlock(&recall_lock);
2656 list_for_each_safe(pos, next, &reaplist) {
2657 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2658 list_del_init(&dp->dl_recall_lru);
2659 unhash_delegation(dp);
2660 }
2661 test_val = NFSD_LEASE_TIME;
2662 list_for_each_safe(pos, next, &close_lru) {
2663 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2664 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2665 u = sop->so_time - cutoff;
2666 if (test_val > u)
2667 test_val = u;
2668 break;
2669 }
2670 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2671 sop->so_id);
f044ff83 2672 release_openowner(sop);
1da177e4
LT		 2673 }
2674 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2675 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2676 nfs4_unlock_state();
2677 return clientid_val;
2678}
2679
a254b246
HH		 2680static struct workqueue_struct *laundry_wq;
2681static void laundromat_main(struct work_struct *);
2682static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2683
2684static void
c4028958 2685laundromat_main(struct work_struct *not_used)
1da177e4
LT		 2686{
2687 time_t t;
2688
2689 t = nfs4_laundromat();
2690 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 2691 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 2692}
2693
fd39ca9a 2694static struct nfs4_stateowner *
f8816512
N		 2695search_close_lru(u32 st_id, int flags)
2696{
1da177e4
LT		 2697 struct nfs4_stateowner *local = NULL;
2698
1da177e4
LT		 2699 if (flags & CLOSE_STATE) {
2700 list_for_each_entry(local, &close_lru, so_close_lru) {
2701 if (local->so_id == st_id)
2702 return local;
2703 }
2704 }
2705 return NULL;
2706}
2707
2708static inline int
2709nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2710{
7eaa36e2 2711 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 2712}
2713
2714static int
2715STALE_STATEID(stateid_t *stateid)
2716{
78155ed7
BN		 2717 if (time_after((unsigned long)boot_time,
2718 (unsigned long)stateid->si_boot)) {
2719 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2720 stateid->si_boot, stateid->si_stateownerid,
2721 stateid->si_fileid, stateid->si_generation);
2722 return 1;
2723 }
2724 return 0;
2725}
2726
2727static int
2728EXPIRED_STATEID(stateid_t *stateid)
2729{
2730 if (time_before((unsigned long)boot_time,
2731 ((unsigned long)stateid->si_boot)) &&
b8fd47ae 2732 time_before((unsigned long)(stateid->si_boot + lease_time), get_seconds())) {
78155ed7
BN		 2733 dprintk("NFSD: expired stateid (%08x/%08x/%08x/%08x)!\n",
2734 stateid->si_boot, stateid->si_stateownerid,
2735 stateid->si_fileid, stateid->si_generation);
2736 return 1;
2737 }
2738 return 0;
2739}
2740
2741static __be32
2742stateid_error_map(stateid_t *stateid)
2743{
2744 if (STALE_STATEID(stateid))
2745 return nfserr_stale_stateid;
2746 if (EXPIRED_STATEID(stateid))
2747 return nfserr_expired;
2748
2749 dprintk("NFSD: bad stateid (%08x/%08x/%08x/%08x)!\n",
2750 stateid->si_boot, stateid->si_stateownerid,
2751 stateid->si_fileid, stateid->si_generation);
2752 return nfserr_bad_stateid;
1da177e4
LT		 2753}
2754
2755static inline int
2756access_permit_read(unsigned long access_bmap)
2757{
2758 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2759 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2760 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2761}
2762
2763static inline int
2764access_permit_write(unsigned long access_bmap)
2765{
2766 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2767 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2768}
2769
2770static
b37ad28b 2771__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2772{
b37ad28b 2773 __be32 status = nfserr_openmode;
1da177e4
LT		 2774
2775 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2776 goto out;
2777 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2778 goto out;
2779 status = nfs_ok;
2780out:
2781 return status;
2782}
2783
b37ad28b 2784static inline __be32
1da177e4
LT		 2785check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2786{
203a8c8e 2787 if (ONE_STATEID(stateid) && (flags & RD_STATE))
1da177e4 2788 return nfs_ok;
af558e33 2789 else if (locks_in_grace()) {
1da177e4
LT		 2790 /* Answer in remaining cases depends on existance of
2791 * conflicting state; so we must wait out the grace period. */
2792 return nfserr_grace;
2793 } else if (flags & WR_STATE)
2794 return nfs4_share_conflict(current_fh,
2795 NFS4_SHARE_DENY_WRITE);
2796 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2797 return nfs4_share_conflict(current_fh,
2798 NFS4_SHARE_DENY_READ);
2799}
2800
2801/*
2802 * Allow READ/WRITE during grace period on recovered state only for files
2803 * that are not able to provide mandatory locking.
2804 */
2805static inline int
18f82731 2806grace_disallows_io(struct inode *inode)
1da177e4 2807{
203a8c8e 2808 return locks_in_grace() && mandatory_lock(inode);
1da177e4
LT		 2809}
2810
6668958f 2811static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
0836f587 2812{
6668958f
AA		 2813 /*
2814 * When sessions are used the stateid generation number is ignored
2815 * when it is zero.
2816 */
2817 if ((flags & HAS_SESSION) && in->si_generation == 0)
2818 goto out;
2819
0836f587
BF		 2820 /* If the client sends us a stateid from the future, it's buggy: */
2821 if (in->si_generation > ref->si_generation)
2822 return nfserr_bad_stateid;
2823 /*
2824 * The following, however, can happen. For example, if the
2825 * client sends an open and some IO at the same time, the open
2826 * may bump si_generation while the IO is still in flight.
2827 * Thanks to hard links and renames, the client never knows what
2828 * file an open will affect. So it could avoid that situation
2829 * only by serializing all opens and IO from the same open
2830 * owner. To recover from the old_stateid error, the client
2831 * will just have to retry the IO:
2832 */
2833 if (in->si_generation < ref->si_generation)
2834 return nfserr_old_stateid;
6668958f 2835out:
0836f587
BF		 2836 return nfs_ok;
2837}
2838
3e633079
BF		 2839static int is_delegation_stateid(stateid_t *stateid)
2840{
2841 return stateid->si_fileid == 0;
2842}
2843
1da177e4
LT		 2844/*
2845* Checks for stateid operations
2846*/
b37ad28b 2847__be32
dd453dfd
BH		 2848nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2849 stateid_t *stateid, int flags, struct file **filpp)
1da177e4
LT		 2850{
2851 struct nfs4_stateid *stp = NULL;
2852 struct nfs4_delegation *dp = NULL;
dd453dfd 2853 struct svc_fh *current_fh = &cstate->current_fh;
1da177e4 2854 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2855 __be32 status;
1da177e4 2856
1da177e4
LT		 2857 if (filpp)
2858 *filpp = NULL;
2859
18f82731 2860 if (grace_disallows_io(ino))
1da177e4
LT		 2861 return nfserr_grace;
2862
6668958f
AA		 2863 if (nfsd4_has_session(cstate))
2864 flags |= HAS_SESSION;
2865
1da177e4
LT		 2866 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2867 return check_special_stateids(current_fh, stateid, flags);
2868
1da177e4
LT		 2869 status = nfserr_stale_stateid;
2870 if (STALE_STATEID(stateid))
2871 goto out;
2872
1da177e4 2873 status = nfserr_bad_stateid;
3e633079 2874 if (is_delegation_stateid(stateid)) {
a4455be0 2875 dp = find_delegation_stateid(ino, stateid);
78155ed7
BN		 2876 if (!dp) {
2877 status = stateid_error_map(stateid);
1da177e4 2878 goto out;
78155ed7 2879 }
6668958f
AA		 2880 status = check_stateid_generation(stateid, &dp->dl_stateid,
2881 flags);
0c2a498f
BF		 2882 if (status)
2883 goto out;
dc9bf700
BF		 2884 status = nfs4_check_delegmode(dp, flags);
2885 if (status)
2886 goto out;
2887 renew_client(dp->dl_client);
dc9bf700
BF		 2888 if (filpp)
2889 *filpp = dp->dl_vfs_file;
1da177e4 2890 } else { /* open or lock stateid */
a4455be0 2891 stp = find_stateid(stateid, flags);
78155ed7
BN		 2892 if (!stp) {
2893 status = stateid_error_map(stateid);
1da177e4 2894 goto out;
78155ed7 2895 }
6150ef0d 2896 if (nfs4_check_fh(current_fh, stp))
1da177e4
LT		 2897 goto out;
2898 if (!stp->st_stateowner->so_confirmed)
2899 goto out;
6668958f
AA		 2900 status = check_stateid_generation(stateid, &stp->st_stateid,
2901 flags);
0c2a498f
BF		 2902 if (status)
2903 goto out;
a4455be0
BF		 2904 status = nfs4_check_openmode(stp, flags);
2905 if (status)
1da177e4
LT		 2906 goto out;
2907 renew_client(stp->st_stateowner->so_client);
2908 if (filpp)
2909 *filpp = stp->st_vfs_file;
1da177e4
LT		 2910 }
2911 status = nfs_ok;
2912out:
2913 return status;
2914}
2915
4c4cd222
N		 2916static inline int
2917setlkflg (int type)
2918{
2919 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2920 RD_STATE : WR_STATE;
2921}
1da177e4
LT		 2922
2923/*
2924 * Checks for sequence id mutating operations.
2925 */
b37ad28b 2926static __be32
dd453dfd
BH		 2927nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2928 stateid_t *stateid, int flags,
2929 struct nfs4_stateowner **sopp,
2930 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2931{
1da177e4
LT		 2932 struct nfs4_stateid *stp;
2933 struct nfs4_stateowner *sop;
dd453dfd 2934 struct svc_fh *current_fh = &cstate->current_fh;
0836f587 2935 __be32 status;
1da177e4
LT		 2936
2937 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2938 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2939 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2940 stateid->si_generation);
3a4f98bb 2941
1da177e4
LT		 2942 *stpp = NULL;
2943 *sopp = NULL;
2944
1da177e4 2945 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2946 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2947 return nfserr_bad_stateid;
1da177e4
LT		 2948 }
2949
1da177e4 2950 if (STALE_STATEID(stateid))
3a4f98bb 2951 return nfserr_stale_stateid;
6668958f
AA		 2952
2953 if (nfsd4_has_session(cstate))
2954 flags |= HAS_SESSION;
2955
1da177e4
LT		 2956 /*
2957 * We return BAD_STATEID if filehandle doesn't match stateid,
2958 * the confirmed flag is incorrecly set, or the generation
2959 * number is incorrect.
1da177e4 2960 */
f8816512
N		 2961 stp = find_stateid(stateid, flags);
2962 if (stp == NULL) {
2963 /*
2964 * Also, we should make sure this isn't just the result of
2965 * a replayed close:
2966 */
2967 sop = search_close_lru(stateid->si_stateownerid, flags);
2968 if (sop == NULL)
78155ed7 2969 return stateid_error_map(stateid);
f8816512
N		 2970 *sopp = sop;
2971 goto check_replay;
2972 }
1da177e4 2973
39325bd0
BF		 2974 *stpp = stp;
2975 *sopp = sop = stp->st_stateowner;
2976
4c4cd222 2977 if (lock) {
4c4cd222 2978 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2979 struct nfs4_client *clp = sop->so_client;
4c4cd222 2980 int lkflg = 0;
b37ad28b 2981 __be32 status;
4c4cd222
N		 2982
2983 lkflg = setlkflg(lock->lk_type);
2984
2985 if (lock->lk_is_new) {
599e0a22
BF		 2986 if (!sop->so_is_open_owner)
2987 return nfserr_bad_stateid;
60adfc50
AA		 2988 if (!(flags & HAS_SESSION) &&
2989 !same_clid(&clp->cl_clientid, lockclid))
2990 return nfserr_bad_stateid;
599e0a22
BF		 2991 /* stp is the open stateid */
2992 status = nfs4_check_openmode(stp, lkflg);
2993 if (status)
2994 return status;
2995 } else {
2996 /* stp is the lock stateid */
2997 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2998 if (status)
2999 return status;
4c4cd222 3000 }
1da177e4
LT		 3001 }
3002
f3362737 3003 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 3004 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 3005 return nfserr_bad_stateid;
1da177e4
LT		 3006 }
3007
1da177e4
LT		 3008 /*
3009 * We now validate the seqid and stateid generation numbers.
3010 * For the moment, we ignore the possibility of
3011 * generation number wraparound.
3012 */
6668958f 3013 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
1da177e4
LT		 3014 goto check_replay;
3015
3a4f98bb 3016 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 3017 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 3018 " unconfirmed stateowner!\n");
3019 return nfserr_bad_stateid;
1da177e4 3020 }
3a4f98bb 3021 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 3022 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 3023 " confirmed yet!\n");
3024 return nfserr_bad_stateid;
1da177e4 3025 }
6668958f 3026 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
0836f587
BF		 3027 if (status)
3028 return status;
52fd004e 3029 renew_client(sop->so_client);
3a4f98bb 3030 return nfs_ok;
1da177e4 3031
1da177e4 3032check_replay:
bd9aac52 3033 if (seqid == sop->so_seqid - 1) {
849823c5 3034 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 3035 /* indicate replay to calling function */
a90b061c 3036 return nfserr_replay_me;
1da177e4 3037 }
2fdada03 3038 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 3039 sop->so_seqid, seqid);
3040 *sopp = NULL;
3041 return nfserr_bad_seqid;
1da177e4
LT		 3042}
3043
b37ad28b 3044__be32
ca364317 3045nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3046 struct nfsd4_open_confirm *oc)
1da177e4 3047{
b37ad28b 3048 __be32 status;
1da177e4
LT		 3049 struct nfs4_stateowner *sop;
3050 struct nfs4_stateid *stp;
3051
3052 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 3053 (int)cstate->current_fh.fh_dentry->d_name.len,
3054 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3055
ca364317 3056 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 3057 if (status)
3058 return status;
1da177e4
LT		 3059
3060 nfs4_lock_state();
3061
dd453dfd 3062 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3063 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 3064 CONFIRM | OPEN_STATE,
1da177e4
LT		 3065 &oc->oc_stateowner, &stp, NULL)))
3066 goto out;
3067
3068 sop = oc->oc_stateowner;
3069 sop->so_confirmed = 1;
3070 update_stateid(&stp->st_stateid);
3071 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3072 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
3073 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
3074 stp->st_stateid.si_boot,
3075 stp->st_stateid.si_stateownerid,
3076 stp->st_stateid.si_fileid,
3077 stp->st_stateid.si_generation);
c7b9a459
N		 3078
3079 nfsd4_create_clid_dir(sop->so_client);
1da177e4 3080out:
f2327d9a 3081 if (oc->oc_stateowner) {
1da177e4 3082 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 3083 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 3084 }
1da177e4
LT		 3085 nfs4_unlock_state();
3086 return status;
3087}
3088
3089
3090/*
3091 * unset all bits in union bitmap (bmap) that
3092 * do not exist in share (from successful OPEN_DOWNGRADE)
3093 */
3094static void
3095reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3096{
3097 int i;
3098 for (i = 1; i < 4; i++) {
3099 if ((i & access) != i)
3100 __clear_bit(i, bmap);
3101 }
3102}
3103
3104static void
3105reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3106{
3107 int i;
3108 for (i = 0; i < 4; i++) {
3109 if ((i & deny) != i)
3110 __clear_bit(i, bmap);
3111 }
3112}
3113
b37ad28b 3114__be32
ca364317
BF		 3115nfsd4_open_downgrade(struct svc_rqst *rqstp,
3116 struct nfsd4_compound_state *cstate,
a4f1706a 3117 struct nfsd4_open_downgrade *od)
1da177e4 3118{
b37ad28b 3119 __be32 status;
1da177e4
LT		 3120 struct nfs4_stateid *stp;
3121 unsigned int share_access;
3122
3123 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 3124 (int)cstate->current_fh.fh_dentry->d_name.len,
3125 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 3126
d87a8ade 3127 if (!access_valid(od->od_share_access, cstate->minorversion)
ba5a6a19 3128 || !deny_valid(od->od_share_deny))
1da177e4
LT		 3129 return nfserr_inval;
3130
3131 nfs4_lock_state();
dd453dfd 3132 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3133 od->od_seqid,
1da177e4 3134 &od->od_stateid,
f3362737 3135 OPEN_STATE,
1da177e4
LT		 3136 &od->od_stateowner, &stp, NULL)))
3137 goto out;
3138
3139 status = nfserr_inval;
3140 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3141 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3142 stp->st_access_bmap, od->od_share_access);
3143 goto out;
3144 }
3145 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3146 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3147 stp->st_deny_bmap, od->od_share_deny);
3148 goto out;
3149 }
3150 set_access(&share_access, stp->st_access_bmap);
3151 nfs4_file_downgrade(stp->st_vfs_file,
3152 share_access & ~od->od_share_access);
3153
3154 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3155 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3156
3157 update_stateid(&stp->st_stateid);
3158 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3159 status = nfs_ok;
3160out:
f2327d9a 3161 if (od->od_stateowner) {
1da177e4 3162 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 3163 cstate->replay_owner = od->od_stateowner;
f2327d9a 3164 }
1da177e4
LT		 3165 nfs4_unlock_state();
3166 return status;
3167}
3168
3169/*
3170 * nfs4_unlock_state() called after encode
3171 */
b37ad28b 3172__be32
ca364317 3173nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3174 struct nfsd4_close *close)
1da177e4 3175{
b37ad28b 3176 __be32 status;
1da177e4
LT		 3177 struct nfs4_stateid *stp;
3178
3179 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 3180 (int)cstate->current_fh.fh_dentry->d_name.len,
3181 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 3182
3183 nfs4_lock_state();
3184 /* check close_lru for replay */
dd453dfd 3185 if ((status = nfs4_preprocess_seqid_op(cstate,
ca364317 3186 close->cl_seqid,
1da177e4 3187 &close->cl_stateid,
f3362737 3188 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 3189 &close->cl_stateowner, &stp, NULL)))
3190 goto out;
1da177e4
LT		 3191 status = nfs_ok;
3192 update_stateid(&stp->st_stateid);
3193 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3194
04ef5954 3195 /* release_stateid() calls nfsd_close() if needed */
2283963f 3196 release_open_stateid(stp);
04ef5954
BF		 3197
3198 /* place unused nfs4_stateowners on so_close_lru list to be
3199 * released by the laundromat service after the lease period
3200 * to enable us to handle CLOSE replay
3201 */
3202 if (list_empty(&close->cl_stateowner->so_stateids))
3203 move_to_close_lru(close->cl_stateowner);
1da177e4 3204out:
f2327d9a 3205 if (close->cl_stateowner) {
1da177e4 3206 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 3207 cstate->replay_owner = close->cl_stateowner;
f2327d9a 3208 }
1da177e4
LT		 3209 nfs4_unlock_state();
3210 return status;
3211}
3212
b37ad28b 3213__be32
ca364317
BF		 3214nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3215 struct nfsd4_delegreturn *dr)
1da177e4 3216{
203a8c8e
BF		 3217 struct nfs4_delegation *dp;
3218 stateid_t *stateid = &dr->dr_stateid;
3219 struct inode *inode;
b37ad28b 3220 __be32 status;
6668958f 3221 int flags = 0;
1da177e4 3222
ca364317 3223 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
203a8c8e
BF		 3224 return status;
3225 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4 3226
6668958f
AA		 3227 if (nfsd4_has_session(cstate))
3228 flags |= HAS_SESSION;
1da177e4 3229 nfs4_lock_state();
203a8c8e
BF		 3230 status = nfserr_bad_stateid;
3231 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3232 goto out;
3233 status = nfserr_stale_stateid;
3234 if (STALE_STATEID(stateid))
3235 goto out;
7e0f7cf5 3236 status = nfserr_bad_stateid;
203a8c8e
BF		 3237 if (!is_delegation_stateid(stateid))
3238 goto out;
203a8c8e 3239 dp = find_delegation_stateid(inode, stateid);
78155ed7
BN		 3240 if (!dp) {
3241 status = stateid_error_map(stateid);
203a8c8e 3242 goto out;
78155ed7 3243 }
6668958f 3244 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
203a8c8e
BF		 3245 if (status)
3246 goto out;
3247 renew_client(dp->dl_client);
3248
3249 unhash_delegation(dp);
1da177e4 3250out:
203a8c8e
BF		 3251 nfs4_unlock_state();
3252
1da177e4
LT		 3253 return status;
3254}
3255
3256
3257/*
3258 * Lock owner state (byte-range locks)
3259 */
3260#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3261#define LOCK_HASH_BITS 8
3262#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3263#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3264
87df4de8
BH		 3265static inline u64
3266end_offset(u64 start, u64 len)
3267{
3268 u64 end;
3269
3270 end = start + len;
3271 return end >= start ? end: NFS4_MAX_UINT64;
3272}
3273
3274/* last octet in a range */
3275static inline u64
3276last_byte_offset(u64 start, u64 len)
3277{
3278 u64 end;
3279
3280 BUG_ON(!len);
3281 end = start + len;
3282 return end > start ? end - 1: NFS4_MAX_UINT64;
3283}
3284
1da177e4
LT		 3285#define lockownerid_hashval(id) \
3286 ((id) & LOCK_HASH_MASK)
3287
3288static inline unsigned int
3289lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3290 struct xdr_netobj *ownername)
3291{
3292 return (file_hashval(inode) + cl_id
3293 + opaque_hashval(ownername->data, ownername->len))
3294 & LOCK_HASH_MASK;
3295}
3296
3297static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3298static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3299static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3300
fd39ca9a 3301static struct nfs4_stateid *
1da177e4
LT		 3302find_stateid(stateid_t *stid, int flags)
3303{
9346eff0 3304 struct nfs4_stateid *local;
1da177e4
LT		 3305 u32 st_id = stid->si_stateownerid;
3306 u32 f_id = stid->si_fileid;
3307 unsigned int hashval;
3308
3309 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 3310 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3311 hashval = stateid_hashval(st_id, f_id);
3312 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3313 if ((local->st_stateid.si_stateownerid == st_id) &&
3314 (local->st_stateid.si_fileid == f_id))
3315 return local;
3316 }
3317 }
9346eff0
KK		 3318
3319 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 3320 hashval = stateid_hashval(st_id, f_id);
3321 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3322 if ((local->st_stateid.si_stateownerid == st_id) &&
3323 (local->st_stateid.si_fileid == f_id))
3324 return local;
3325 }
849823c5 3326 }
1da177e4
LT		 3327 return NULL;
3328}
3329
3330static struct nfs4_delegation *
3331find_delegation_stateid(struct inode *ino, stateid_t *stid)
3332{
13cd2184
N		 3333 struct nfs4_file *fp;
3334 struct nfs4_delegation *dl;
1da177e4
LT		 3335
3336 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
3337 stid->si_boot, stid->si_stateownerid,
3338 stid->si_fileid, stid->si_generation);
3339
1da177e4 3340 fp = find_file(ino);
13cd2184
N		 3341 if (!fp)
3342 return NULL;
3343 dl = find_delegation_file(fp, stid);
3344 put_nfs4_file(fp);
3345 return dl;
1da177e4
LT		 3346}
3347
3348/*
3349 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3350 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3351 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3352 * locking, this prevents us from being completely protocol-compliant. The
3353 * real solution to this problem is to start using unsigned file offsets in
3354 * the VFS, but this is a very deep change!
3355 */
3356static inline void
3357nfs4_transform_lock_offset(struct file_lock *lock)
3358{
3359 if (lock->fl_start < 0)
3360 lock->fl_start = OFFSET_MAX;
3361 if (lock->fl_end < 0)
3362 lock->fl_end = OFFSET_MAX;
3363}
3364
d5b9026a
N		 3365/* Hack!: For now, we're defining this just so we can use a pointer to it
3366 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 3367static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 3368};
1da177e4
LT		 3369
3370static inline void
3371nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3372{
d5b9026a
N		 3373 struct nfs4_stateowner *sop;
3374 unsigned int hval;
1da177e4 3375
d5b9026a
N		 3376 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3377 sop = (struct nfs4_stateowner *) fl->fl_owner;
3378 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 3379 kref_get(&sop->so_ref);
3380 deny->ld_sop = sop;
3381 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 3382 } else {
3383 deny->ld_sop = NULL;
3384 deny->ld_clientid.cl_boot = 0;
3385 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 3386 }
3387 deny->ld_start = fl->fl_start;
87df4de8
BH		 3388 deny->ld_length = NFS4_MAX_UINT64;
3389 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 3390 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3391 deny->ld_type = NFS4_READ_LT;
3392 if (fl->fl_type != F_RDLCK)
3393 deny->ld_type = NFS4_WRITE_LT;
3394}
3395
1da177e4
LT		 3396static struct nfs4_stateowner *
3397find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3398 struct xdr_netobj *owner)
3399{
3400 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3401 struct nfs4_stateowner *op;
3402
3403 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 3404 if (same_owner_str(op, owner, clid))
1da177e4
LT		 3405 return op;
3406 }
3407 return NULL;
3408}
3409
3410/*
3411 * Alloc a lock owner structure.
3412 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3413 * occured.
3414 *
3415 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 3416 */
3417
3418static struct nfs4_stateowner *
3419alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3420 struct nfs4_stateowner *sop;
3421 struct nfs4_replay *rp;
3422 unsigned int idhashval;
3423
3424 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3425 return NULL;
3426 idhashval = lockownerid_hashval(current_ownerid);
3427 INIT_LIST_HEAD(&sop->so_idhash);
3428 INIT_LIST_HEAD(&sop->so_strhash);
3429 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 3430 INIT_LIST_HEAD(&sop->so_stateids);
3431 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 3432 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3433 sop->so_time = 0;
3434 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3435 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 3436 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 3437 sop->so_is_open_owner = 0;
3438 sop->so_id = current_ownerid++;
3439 sop->so_client = clp;
b59e3c0e
NB		 3440 /* It is the openowner seqid that will be incremented in encode in the
3441 * case of new lockowners; so increment the lock seqid manually: */
3442 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 3443 sop->so_confirmed = 1;
3444 rp = &sop->so_replay;
de1ae286 3445 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 3446 rp->rp_buflen = 0;
3447 rp->rp_buf = rp->rp_ibuf;
3448 return sop;
3449}
3450
fd39ca9a 3451static struct nfs4_stateid *
1da177e4
LT		 3452alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3453{
3454 struct nfs4_stateid *stp;
3455 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3456
5ac049ac
N		 3457 stp = nfs4_alloc_stateid();
3458 if (stp == NULL)
1da177e4
LT		 3459 goto out;
3460 INIT_LIST_HEAD(&stp->st_hash);
3461 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 3462 INIT_LIST_HEAD(&stp->st_perstateowner);
3463 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 3464 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 3465 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 3466 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 3467 stp->st_stateowner = sop;
13cd2184 3468 get_nfs4_file(fp);
1da177e4 3469 stp->st_file = fp;
78155ed7 3470 stp->st_stateid.si_boot = get_seconds();
1da177e4
LT		 3471 stp->st_stateid.si_stateownerid = sop->so_id;
3472 stp->st_stateid.si_fileid = fp->fi_id;
3473 stp->st_stateid.si_generation = 0;
3474 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3475 stp->st_access_bmap = open_stp->st_access_bmap;
3476 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 3477 stp->st_openstp = open_stp;
1da177e4
LT		 3478
3479out:
3480 return stp;
3481}
3482
fd39ca9a 3483static int
1da177e4
LT		 3484check_lock_length(u64 offset, u64 length)
3485{
87df4de8 3486 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 3487 LOFF_OVERFLOW(offset, length)));
3488}
3489
3490/*
3491 * LOCK operation
3492 */
b37ad28b 3493__be32
ca364317 3494nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3495 struct nfsd4_lock *lock)
1da177e4 3496{
3e9e3dbe 3497 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 3498 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 3499 struct nfs4_stateid *lock_stp;
3500 struct file *filp;
3501 struct file_lock file_lock;
8dc7c311 3502 struct file_lock conflock;
b37ad28b 3503 __be32 status = 0;
1da177e4 3504 unsigned int strhashval;
150b3934 3505 unsigned int cmd;
b8dd7b9a 3506 int err;
1da177e4
LT		 3507
3508 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3509 (long long) lock->lk_offset,
3510 (long long) lock->lk_length);
3511
1da177e4
LT		 3512 if (check_lock_length(lock->lk_offset, lock->lk_length))
3513 return nfserr_inval;
3514
ca364317 3515 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 3516 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 3517 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3518 return status;
3519 }
3520
1da177e4
LT		 3521 nfs4_lock_state();
3522
3523 if (lock->lk_is_new) {
893f8770
N		 3524 /*
3525 * Client indicates that this is a new lockowner.
3526 * Use open owner and open stateid to create lock owner and
3527 * lock stateid.
3528 */
1da177e4
LT		 3529 struct nfs4_stateid *open_stp = NULL;
3530 struct nfs4_file *fp;
3531
3532 status = nfserr_stale_clientid;
60adfc50
AA		 3533 if (!nfsd4_has_session(cstate) &&
3534 STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 3535 goto out;
1da177e4 3536
1da177e4 3537 /* validate and update open stateid and open seqid */
dd453dfd 3538 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3539 lock->lk_new_open_seqid,
3540 &lock->lk_new_open_stateid,
f3362737 3541 OPEN_STATE,
3a65588a 3542 &lock->lk_replay_owner, &open_stp,
b59e3c0e 3543 lock);
37515177 3544 if (status)
1da177e4 3545 goto out;
3a65588a 3546 open_sop = lock->lk_replay_owner;
1da177e4
LT		 3547 /* create lockowner and lock stateid */
3548 fp = open_stp->st_file;
3549 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3550 open_sop->so_client->cl_clientid.cl_id,
3551 &lock->v.new.owner);
3e9e3dbe
N		 3552 /* XXX: Do we need to check for duplicate stateowners on
3553 * the same file, or should they just be allowed (and
3554 * create new stateids)? */
1da177e4 3555 status = nfserr_resource;
b59e3c0e
NB		 3556 lock_sop = alloc_init_lock_stateowner(strhashval,
3557 open_sop->so_client, open_stp, lock);
3558 if (lock_sop == NULL)
1da177e4 3559 goto out;
b59e3c0e 3560 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 3561 if (lock_stp == NULL)
1da177e4 3562 goto out;
1da177e4
LT		 3563 } else {
3564 /* lock (lock owner + lock stateid) already exists */
dd453dfd 3565 status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3566 lock->lk_old_lock_seqid,
3567 &lock->lk_old_lock_stateid,
f3362737 3568 LOCK_STATE,
3a65588a 3569 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 3570 if (status)
3571 goto out;
3a65588a 3572 lock_sop = lock->lk_replay_owner;
1da177e4 3573 }
3a65588a 3574 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 3575 filp = lock_stp->st_vfs_file;
3576
0dd395dc 3577 status = nfserr_grace;
af558e33 3578 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 3579 goto out;
3580 status = nfserr_no_grace;
af558e33 3581 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 3582 goto out;
3583
1da177e4
LT		 3584 locks_init_lock(&file_lock);
3585 switch (lock->lk_type) {
3586 case NFS4_READ_LT:
3587 case NFS4_READW_LT:
3588 file_lock.fl_type = F_RDLCK;
150b3934 3589 cmd = F_SETLK;
1da177e4
LT		 3590 break;
3591 case NFS4_WRITE_LT:
3592 case NFS4_WRITEW_LT:
3593 file_lock.fl_type = F_WRLCK;
150b3934 3594 cmd = F_SETLK;
1da177e4
LT		 3595 break;
3596 default:
3597 status = nfserr_inval;
3598 goto out;
3599 }
b59e3c0e 3600 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 3601 file_lock.fl_pid = current->tgid;
3602 file_lock.fl_file = filp;
3603 file_lock.fl_flags = FL_POSIX;
d5b9026a 3604 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3605
3606 file_lock.fl_start = lock->lk_offset;
87df4de8 3607 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 3608 nfs4_transform_lock_offset(&file_lock);
3609
3610 /*
3611 * Try to lock the file in the VFS.
3612 * Note: locks.c uses the BKL to protect the inode's lock list.
3613 */
3614
fd85b817 3615 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 3616 switch (-err) {
1da177e4
LT		 3617 case 0: /* success! */
3618 update_stateid(&lock_stp->st_stateid);
3619 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3620 sizeof(stateid_t));
b8dd7b9a 3621 status = 0;
eb76b3fd
AA		 3622 break;
3623 case (EAGAIN): /* conflock holds conflicting lock */
3624 status = nfserr_denied;
3625 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3626 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3627 break;
1da177e4
LT		 3628 case (EDEADLK):
3629 status = nfserr_deadlock;
eb76b3fd 3630 break;
1da177e4 3631 default:
fd85b817 3632 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 3633 status = nfserr_resource;
3634 break;
1da177e4 3635 }
1da177e4 3636out:
8a280510 3637 if (status && lock->lk_is_new && lock_sop)
f044ff83 3638 release_lockowner(lock_sop);
3a65588a
BF		 3639 if (lock->lk_replay_owner) {
3640 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 3641 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 3642 }
1da177e4
LT		 3643 nfs4_unlock_state();
3644 return status;
3645}
3646
55ef1274
BF		 3647/*
3648 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3649 * so we do a temporary open here just to get an open file to pass to
3650 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3651 * inode operation.)
3652 */
3653static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3654{
3655 struct file *file;
3656 int err;
3657
3658 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3659 if (err)
3660 return err;
3661 err = vfs_test_lock(file, lock);
3662 nfsd_close(file);
3663 return err;
3664}
3665
1da177e4
LT		 3666/*
3667 * LOCKT operation
3668 */
b37ad28b 3669__be32
ca364317
BF		 3670nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3671 struct nfsd4_lockt *lockt)
1da177e4
LT		 3672{
3673 struct inode *inode;
1da177e4 3674 struct file_lock file_lock;
fd85b817 3675 int error;
b37ad28b 3676 __be32 status;
1da177e4 3677
af558e33 3678 if (locks_in_grace())
1da177e4
LT		 3679 return nfserr_grace;
3680
3681 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3682 return nfserr_inval;
3683
3684 lockt->lt_stateowner = NULL;
3685 nfs4_lock_state();
3686
3687 status = nfserr_stale_clientid;
60adfc50 3688 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 3689 goto out;
1da177e4 3690
ca364317 3691 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 3692 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 3693 if (status == nfserr_symlink)
3694 status = nfserr_inval;
3695 goto out;
3696 }
3697
ca364317 3698 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 3699 locks_init_lock(&file_lock);
3700 switch (lockt->lt_type) {
3701 case NFS4_READ_LT:
3702 case NFS4_READW_LT:
3703 file_lock.fl_type = F_RDLCK;
3704 break;
3705 case NFS4_WRITE_LT:
3706 case NFS4_WRITEW_LT:
3707 file_lock.fl_type = F_WRLCK;
3708 break;
3709 default:
2fdada03 3710 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 3711 status = nfserr_inval;
3712 goto out;
3713 }
3714
3715 lockt->lt_stateowner = find_lockstateowner_str(inode,
3716 &lockt->lt_clientid, &lockt->lt_owner);
3717 if (lockt->lt_stateowner)
3718 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3719 file_lock.fl_pid = current->tgid;
3720 file_lock.fl_flags = FL_POSIX;
3721
3722 file_lock.fl_start = lockt->lt_offset;
87df4de8 3723 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 3724
3725 nfs4_transform_lock_offset(&file_lock);
3726
1da177e4 3727 status = nfs_ok;
55ef1274 3728 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 3729 if (error) {
3730 status = nfserrno(error);
3731 goto out;
3732 }
9d6a8c5c 3733 if (file_lock.fl_type != F_UNLCK) {
1da177e4 3734 status = nfserr_denied;
9d6a8c5c 3735 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 3736 }
3737out:
3738 nfs4_unlock_state();
3739 return status;
3740}
3741
b37ad28b 3742__be32
ca364317 3743nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 3744 struct nfsd4_locku *locku)
1da177e4
LT		 3745{
3746 struct nfs4_stateid *stp;
3747 struct file *filp = NULL;
3748 struct file_lock file_lock;
b37ad28b 3749 __be32 status;
b8dd7b9a 3750 int err;
1da177e4
LT		 3751
3752 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3753 (long long) locku->lu_offset,
3754 (long long) locku->lu_length);
3755
3756 if (check_lock_length(locku->lu_offset, locku->lu_length))
3757 return nfserr_inval;
3758
3759 nfs4_lock_state();
3760
dd453dfd 3761 if ((status = nfs4_preprocess_seqid_op(cstate,
1da177e4
LT		 3762 locku->lu_seqid,
3763 &locku->lu_stateid,
f3362737 3764 LOCK_STATE,
1da177e4
LT		 3765 &locku->lu_stateowner, &stp, NULL)))
3766 goto out;
3767
3768 filp = stp->st_vfs_file;
3769 BUG_ON(!filp);
3770 locks_init_lock(&file_lock);
3771 file_lock.fl_type = F_UNLCK;
3772 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3773 file_lock.fl_pid = current->tgid;
3774 file_lock.fl_file = filp;
3775 file_lock.fl_flags = FL_POSIX;
d5b9026a 3776 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 3777 file_lock.fl_start = locku->lu_offset;
3778
87df4de8 3779 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 3780 nfs4_transform_lock_offset(&file_lock);
3781
3782 /*
3783 * Try to unlock the file in the VFS.
3784 */
fd85b817 3785 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 3786 if (err) {
fd85b817 3787 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 3788 goto out_nfserr;
3789 }
3790 /*
3791 * OK, unlock succeeded; the only thing left to do is update the stateid.
3792 */
3793 update_stateid(&stp->st_stateid);
3794 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3795
3796out:
f2327d9a 3797 if (locku->lu_stateowner) {
1da177e4 3798 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 3799 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 3800 }
1da177e4
LT		 3801 nfs4_unlock_state();
3802 return status;
3803
3804out_nfserr:
b8dd7b9a 3805 status = nfserrno(err);
1da177e4
LT		 3806 goto out;
3807}
3808
3809/*
3810 * returns
3811 * 1: locks held by lockowner
3812 * 0: no locks held by lockowner
3813 */
3814static int
3815check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3816{
3817 struct file_lock **flpp;
7eaa36e2 3818 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 3819 int status = 0;
3820
3821 lock_kernel();
3822 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 3823 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 3824 status = 1;
3825 goto out;
796dadfd 3826 }
1da177e4
LT		 3827 }
3828out:
3829 unlock_kernel();
3830 return status;
3831}
3832
b37ad28b 3833__be32
b591480b
BF		 3834nfsd4_release_lockowner(struct svc_rqst *rqstp,
3835 struct nfsd4_compound_state *cstate,
3836 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3837{
3838 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3839 struct nfs4_stateowner *sop;
3840 struct nfs4_stateid *stp;
1da177e4 3841 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3842 struct list_head matches;
3843 int i;
b37ad28b 3844 __be32 status;
1da177e4
LT		 3845
3846 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3847 clid->cl_boot, clid->cl_id);
3848
3849 /* XXX check for lease expiration */
3850
3851 status = nfserr_stale_clientid;
849823c5 3852 if (STALE_CLIENTID(clid))
1da177e4 3853 return status;
1da177e4
LT		 3854
3855 nfs4_lock_state();
3856
3e9e3dbe
N		 3857 status = nfserr_locks_held;
3858 /* XXX: we're doing a linear search through all the lockowners.
3859 * Yipes! For now we'll just hope clients aren't really using
3860 * release_lockowner much, but eventually we have to fix these
3861 * data structures. */
3862 INIT_LIST_HEAD(&matches);
3863 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3864 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3865 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3866 continue;
3867 list_for_each_entry(stp, &sop->so_stateids,
3868 st_perstateowner) {
3869 if (check_for_locks(stp->st_vfs_file, sop))
3870 goto out;
3871 /* Note: so_perclient unused for lockowners,
3872 * so it's OK to fool with here. */
3873 list_add(&sop->so_perclient, &matches);
3874 }
1da177e4 3875 }
3e9e3dbe
N		 3876 }
3877 /* Clients probably won't expect us to return with some (but not all)
3878 * of the lockowner state released; so don't release any until all
3879 * have been checked. */
3880 status = nfs_ok;
0fa822e4
N		 3881 while (!list_empty(&matches)) {
3882 sop = list_entry(matches.next, struct nfs4_stateowner,
3883 so_perclient);
3884 /* unhash_stateowner deletes so_perclient only
3885 * for openowners. */
3886 list_del(&sop->so_perclient);
f044ff83 3887 release_lockowner(sop);
1da177e4
LT		 3888 }
3889out:
3890 nfs4_unlock_state();
3891 return status;
3892}
3893
3894static inline struct nfs4_client_reclaim *
a55370a3 3895alloc_reclaim(void)
1da177e4 3896{
a55370a3 3897 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3898}
3899
c7b9a459 3900int
a1bcecd2 3901nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
c7b9a459
N		 3902{
3903 unsigned int strhashval = clientstr_hashval(name);
3904 struct nfs4_client *clp;
3905
a1bcecd2 3906 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
c7b9a459
N		 3907 return clp ? 1 : 0;
3908}
3909
1da177e4
LT		 3910/*
3911 * failure => all reset bets are off, nfserr_no_grace...
3912 */
190e4fbf
N		 3913int
3914nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3915{
3916 unsigned int strhashval;
3917 struct nfs4_client_reclaim *crp = NULL;
3918
a55370a3
N		 3919 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3920 crp = alloc_reclaim();
1da177e4
LT		 3921 if (!crp)
3922 return 0;
a55370a3 3923 strhashval = clientstr_hashval(name);
1da177e4
LT		 3924 INIT_LIST_HEAD(&crp->cr_strhash);
3925 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3926 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3927 reclaim_str_hashtbl_size++;
3928 return 1;
3929}
3930
3931static void
3932nfs4_release_reclaim(void)
3933{
3934 struct nfs4_client_reclaim *crp = NULL;
3935 int i;
3936
1da177e4
LT		 3937 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3938 while (!list_empty(&reclaim_str_hashtbl[i])) {
3939 crp = list_entry(reclaim_str_hashtbl[i].next,
3940 struct nfs4_client_reclaim, cr_strhash);
3941 list_del(&crp->cr_strhash);
1da177e4
LT		 3942 kfree(crp);
3943 reclaim_str_hashtbl_size--;
3944 }
3945 }
3946 BUG_ON(reclaim_str_hashtbl_size);
3947}
3948
3949/*
3950 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3951static struct nfs4_client_reclaim *
1da177e4
LT		 3952nfs4_find_reclaim_client(clientid_t *clid)
3953{
3954 unsigned int strhashval;
3955 struct nfs4_client *clp;
3956 struct nfs4_client_reclaim *crp = NULL;
3957
3958
3959 /* find clientid in conf_id_hashtbl */
3960 clp = find_confirmed_client(clid);
3961 if (clp == NULL)
3962 return NULL;
3963
a55370a3
N		 3964 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3965 clp->cl_name.len, clp->cl_name.data,
3966 clp->cl_recdir);
1da177e4
LT		 3967
3968 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3969 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3970 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3971 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3972 return crp;
3973 }
3974 }
3975 return NULL;
3976}
3977
3978/*
3979* Called from OPEN. Look for clientid in reclaim list.
3980*/
b37ad28b 3981__be32
1da177e4
LT		 3982nfs4_check_open_reclaim(clientid_t *clid)
3983{
dfc83565 3984 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3985}
3986
ac4d8ff2 3987/* initialization to perform at module load time: */
1da177e4 3988
e8ff2a84 3989int
ac4d8ff2 3990nfs4_state_init(void)
1da177e4 3991{
e8ff2a84 3992 int i, status;
1da177e4 3993
e8ff2a84
BF		 3994 status = nfsd4_init_slabs();
3995 if (status)
3996 return status;
1da177e4
LT		 3997 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3998 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3999 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4000 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4001 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
02cb2858 4002 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
1da177e4 4003 }
5282fd72
ME		 4004 for (i = 0; i < SESSION_HASH_SIZE; i++)
4005 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
1da177e4
LT		 4006 for (i = 0; i < FILE_HASH_SIZE; i++) {
4007 INIT_LIST_HEAD(&file_hashtbl[i]);
4008 }
4009 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4010 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4011 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
4012 }
4013 for (i = 0; i < STATEID_HASH_SIZE; i++) {
4014 INIT_LIST_HEAD(&stateid_hashtbl[i]);
4015 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
4016 }
4017 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4018 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
4019 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4020 }
1da177e4 4021 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 4022 INIT_LIST_HEAD(&close_lru);
4023 INIT_LIST_HEAD(&client_lru);
4024 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2 4025 reclaim_str_hashtbl_size = 0;
e8ff2a84 4026 return 0;
ac4d8ff2
N		 4027}
4028
190e4fbf
N		 4029static void
4030nfsd4_load_reboot_recovery_data(void)
4031{
4032 int status;
4033
0964a3d3
N		 4034 nfs4_lock_state();
4035 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 4036 status = nfsd4_recdir_load();
0964a3d3 4037 nfs4_unlock_state();
190e4fbf
N		 4038 if (status)
4039 printk("NFSD: Failure reading reboot recovery data\n");
4040}
4041
9a8db97e
ME		 4042unsigned long
4043get_nfs4_grace_period(void)
4044{
4045 return max(user_lease_time, lease_time) * HZ;
4046}
4047
c2f1a551
MS		 4048/*
4049 * Since the lifetime of a delegation isn't limited to that of an open, a
4050 * client may quite reasonably hang on to a delegation as long as it has
4051 * the inode cached. This becomes an obvious problem the first time a
4052 * client's inode cache approaches the size of the server's total memory.
4053 *
4054 * For now we avoid this problem by imposing a hard limit on the number
4055 * of delegations, which varies according to the server's memory size.
4056 */
4057static void
4058set_max_delegations(void)
4059{
4060 /*
4061 * Allow at most 4 delegations per megabyte of RAM. Quick
4062 * estimates suggest that in the worst case (where every delegation
4063 * is for a different inode), a delegation could take about 1.5K,
4064 * giving a worst case usage of about 6% of memory.
4065 */
4066 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4067}
4068
ac4d8ff2
N		 4069/* initialization to perform when the nfsd service is started: */
4070
4071static void
4072__nfs4_state_start(void)
4073{
9a8db97e 4074 unsigned long grace_time;
ac4d8ff2 4075
1da177e4 4076 boot_time = get_seconds();
af558e33 4077 grace_time = get_nfs4_grace_period();
d99a05ad 4078 lease_time = user_lease_time;
af558e33 4079 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 4080 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4081 grace_time/HZ);
58da282b 4082 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 4083 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 4084 set_max_delegations();
1da177e4
LT		 4085}
4086
e8ff2a84 4087void
76a3550e 4088nfs4_state_start(void)
1da177e4 4089{
1da177e4 4090 if (nfs4_init)
e8ff2a84 4091 return;
190e4fbf 4092 nfsd4_load_reboot_recovery_data();
76a3550e 4093 __nfs4_state_start();
1da177e4 4094 nfs4_init = 1;
e8ff2a84 4095 return;
1da177e4
LT		 4096}
4097
1da177e4
LT		 4098time_t
4099nfs4_lease_time(void)
4100{
4101 return lease_time;
4102}
4103
4104static void
4105__nfs4_state_shutdown(void)
4106{
4107 int i;
4108 struct nfs4_client *clp = NULL;
4109 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 4110 struct list_head *pos, *next, reaplist;
4111
1da177e4
LT		 4112 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4113 while (!list_empty(&conf_id_hashtbl[i])) {
4114 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4115 expire_client(clp);
4116 }
4117 while (!list_empty(&unconf_str_hashtbl[i])) {
4118 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4119 expire_client(clp);
4120 }
4121 }
4122 INIT_LIST_HEAD(&reaplist);
4123 spin_lock(&recall_lock);
4124 list_for_each_safe(pos, next, &del_recall_lru) {
4125 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4126 list_move(&dp->dl_recall_lru, &reaplist);
4127 }
4128 spin_unlock(&recall_lock);
4129 list_for_each_safe(pos, next, &reaplist) {
4130 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4131 list_del_init(&dp->dl_recall_lru);
4132 unhash_delegation(dp);
4133 }
4134
190e4fbf 4135 nfsd4_shutdown_recdir();
1da177e4 4136 nfs4_init = 0;
1da177e4
LT		 4137}
4138
4139void
4140nfs4_state_shutdown(void)
4141{
5e8d5c29
N		 4142 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4143 destroy_workqueue(laundry_wq);
2c5e7615 4144 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 4145 nfs4_lock_state();
4146 nfs4_release_reclaim();
4147 __nfs4_state_shutdown();
1da177e4
LT		 4148 nfs4_unlock_state();
4149}
4150
3dd98a3b
JL		 4151/*
4152 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4153 * accessed when nfsd is starting.
4154 */
0964a3d3
N		 4155static void
4156nfs4_set_recdir(char *recdir)
4157{
0964a3d3 4158 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 4159}
4160
4161/*
4162 * Change the NFSv4 recovery directory to recdir.
4163 */
4164int
4165nfs4_reset_recoverydir(char *recdir)
4166{
4167 int status;
a63bb996 4168 struct path path;
0964a3d3 4169
a63bb996 4170 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 4171 if (status)
4172 return status;
4173 status = -ENOTDIR;
a63bb996 4174 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 4175 nfs4_set_recdir(recdir);
4176 status = 0;
4177 }
a63bb996 4178 path_put(&path);
0964a3d3
N		 4179 return status;
4180}
4181
3dd98a3b
JL		 4182char *
4183nfs4_recoverydir(void)
4184{
4185 return user_recovery_dirname;
4186}
4187
1da177e4
LT		 4188/*
4189 * Called when leasetime is changed.
4190 *
d99a05ad
N		 4191 * The only way the protocol gives us to handle on-the-fly lease changes is to
4192 * simulate a reboot. Instead of doing that, we just wait till the next time
4193 * we start to register any changes in lease time. If the administrator
4194 * really wants to change the lease time *now*, they can go ahead and bring
4195 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 4196 *
4197 * user_lease_time is protected by nfsd_mutex since it's only really accessed
4198 * when nfsd is starting
1da177e4
LT		 4199 */
4200void
4201nfs4_reset_lease(time_t leasetime)
4202{
d99a05ad 4203 user_lease_time = leasetime;
1da177e4 4204}
Linux kernel - Deliverables
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