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nfsd4: split lockstateid/openstateid release logic
[deliverable/linux.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
aceaf78d 44#include <linux/file.h>
1da177e4
LT		 45#include <linux/mount.h>
46#include <linux/workqueue.h>
47#include <linux/smp_lock.h>
48#include <linux/kthread.h>
49#include <linux/nfs4.h>
50#include <linux/nfsd/state.h>
51#include <linux/nfsd/xdr4.h>
0964a3d3 52#include <linux/namei.h>
c2f1a551 53#include <linux/swap.h>
353ab6e9 54#include <linux/mutex.h>
fd85b817 55#include <linux/lockd/bind.h>
9a8db97e 56#include <linux/module.h>
68e76ad0 57#include <linux/sunrpc/svcauth_gss.h>
1da177e4
LT		 58
59#define NFSDDBG_FACILITY NFSDDBG_PROC
60
61/* Globals */
62static time_t lease_time = 90; /* default lease time */
d99a05ad 63static time_t user_lease_time = 90;
fd39ca9a 64static time_t boot_time;
1da177e4
LT		 65static u32 current_ownerid = 1;
66static u32 current_fileid = 1;
67static u32 current_delegid = 1;
68static u32 nfs4_init;
fd39ca9a
N		 69static stateid_t zerostateid; /* bits all 0 */
70static stateid_t onestateid; /* bits all 1 */
71
72#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 74
1da177e4 75/* forward declarations */
fd39ca9a 76static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 77static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
78static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 79static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 81
82/* Locking:
83 *
353ab6e9 84 * client_mutex:
1da177e4
LT		 85 * protects clientid_hashtbl[], clientstr_hashtbl[],
86 * unconfstr_hashtbl[], uncofid_hashtbl[].
87 */
353ab6e9 88static DEFINE_MUTEX(client_mutex);
1da177e4 89
e18b890b
CL		 90static struct kmem_cache *stateowner_slab = NULL;
91static struct kmem_cache *file_slab = NULL;
92static struct kmem_cache *stateid_slab = NULL;
93static struct kmem_cache *deleg_slab = NULL;
e60d4398 94
1da177e4
LT		 95void
96nfs4_lock_state(void)
97{
353ab6e9 98 mutex_lock(&client_mutex);
1da177e4
LT		 99}
100
101void
102nfs4_unlock_state(void)
103{
353ab6e9 104 mutex_unlock(&client_mutex);
1da177e4
LT		 105}
106
107static inline u32
108opaque_hashval(const void *ptr, int nbytes)
109{
110 unsigned char *cptr = (unsigned char *) ptr;
111
112 u32 x = 0;
113 while (nbytes--) {
114 x *= 37;
115 x += *cptr++;
116 }
117 return x;
118}
119
120/* forward declarations */
121static void release_stateowner(struct nfs4_stateowner *sop);
1da177e4
LT		 122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
34af946a 128static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 129static struct list_head del_recall_lru;
130
13cd2184
N		 131static void
132free_nfs4_file(struct kref *kref)
133{
134 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
135 list_del(&fp->fi_hash);
136 iput(fp->fi_inode);
137 kmem_cache_free(file_slab, fp);
138}
139
140static inline void
141put_nfs4_file(struct nfs4_file *fi)
142{
143 kref_put(&fi->fi_ref, free_nfs4_file);
144}
145
146static inline void
147get_nfs4_file(struct nfs4_file *fi)
148{
149 kref_get(&fi->fi_ref);
150}
151
ef0f3390 152static int num_delegations;
c2f1a551 153unsigned int max_delegations;
ef0f3390
N		 154
155/*
156 * Open owner state (share locks)
157 */
158
159/* hash tables for nfs4_stateowner */
160#define OWNER_HASH_BITS 8
161#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
162#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
163
164#define ownerid_hashval(id) \
165 ((id) & OWNER_HASH_MASK)
166#define ownerstr_hashval(clientid, ownername) \
167 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
168
169static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
170static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
171
172/* hash table for nfs4_file */
173#define FILE_HASH_BITS 8
174#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
175#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
176/* hash table for (open)nfs4_stateid */
177#define STATEID_HASH_BITS 10
178#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
179#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
180
181#define file_hashval(x) \
182 hash_ptr(x, FILE_HASH_BITS)
183#define stateid_hashval(owner_id, file_id) \
184 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
185
186static struct list_head file_hashtbl[FILE_HASH_SIZE];
187static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
188
1da177e4
LT		 189static struct nfs4_delegation *
190alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
191{
192 struct nfs4_delegation *dp;
193 struct nfs4_file *fp = stp->st_file;
194 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
195
196 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 197 if (fp->fi_had_conflict)
198 return NULL;
c2f1a551 199 if (num_delegations > max_delegations)
ef0f3390 200 return NULL;
5b2d21c1
N		 201 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
202 if (dp == NULL)
1da177e4 203 return dp;
ef0f3390 204 num_delegations++;
ea1da636
N		 205 INIT_LIST_HEAD(&dp->dl_perfile);
206 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 207 INIT_LIST_HEAD(&dp->dl_recall_lru);
208 dp->dl_client = clp;
13cd2184 209 get_nfs4_file(fp);
1da177e4
LT		 210 dp->dl_file = fp;
211 dp->dl_flock = NULL;
212 get_file(stp->st_vfs_file);
213 dp->dl_vfs_file = stp->st_vfs_file;
214 dp->dl_type = type;
215 dp->dl_recall.cbr_dp = NULL;
216 dp->dl_recall.cbr_ident = cb->cb_ident;
217 dp->dl_recall.cbr_trunc = 0;
218 dp->dl_stateid.si_boot = boot_time;
219 dp->dl_stateid.si_stateownerid = current_delegid++;
220 dp->dl_stateid.si_fileid = 0;
221 dp->dl_stateid.si_generation = 0;
222 dp->dl_fhlen = current_fh->fh_handle.fh_size;
223 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
224 current_fh->fh_handle.fh_size);
225 dp->dl_time = 0;
226 atomic_set(&dp->dl_count, 1);
ea1da636
N		 227 list_add(&dp->dl_perfile, &fp->fi_delegations);
228 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 229 return dp;
230}
231
232void
233nfs4_put_delegation(struct nfs4_delegation *dp)
234{
235 if (atomic_dec_and_test(&dp->dl_count)) {
236 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 237 put_nfs4_file(dp->dl_file);
5b2d21c1 238 kmem_cache_free(deleg_slab, dp);
ef0f3390 239 num_delegations--;
1da177e4
LT		 240 }
241}
242
243/* Remove the associated file_lock first, then remove the delegation.
244 * lease_modify() is called to remove the FS_LEASE file_lock from
245 * the i_flock list, eventually calling nfsd's lock_manager
246 * fl_release_callback.
247 */
248static void
249nfs4_close_delegation(struct nfs4_delegation *dp)
250{
251 struct file *filp = dp->dl_vfs_file;
252
253 dprintk("NFSD: close_delegation dp %p\n",dp);
254 dp->dl_vfs_file = NULL;
255 /* The following nfsd_close may not actually close the file,
256 * but we want to remove the lease in any case. */
c907132d 257 if (dp->dl_flock)
a9933cea 258 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 259 nfsd_close(filp);
1da177e4
LT		 260}
261
262/* Called under the state lock. */
263static void
264unhash_delegation(struct nfs4_delegation *dp)
265{
ea1da636
N		 266 list_del_init(&dp->dl_perfile);
267 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 268 spin_lock(&recall_lock);
269 list_del_init(&dp->dl_recall_lru);
270 spin_unlock(&recall_lock);
271 nfs4_close_delegation(dp);
272 nfs4_put_delegation(dp);
273}
274
275/*
276 * SETCLIENTID state
277 */
278
279/* Hash tables for nfs4_clientid state */
280#define CLIENT_HASH_BITS 4
281#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
282#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
283
284#define clientid_hashval(id) \
285 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 286#define clientstr_hashval(name) \
287 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 288/*
289 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
290 * used in reboot/reset lease grace period processing
291 *
292 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
293 * setclientid_confirmed info.
294 *
295 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
296 * setclientid info.
297 *
298 * client_lru holds client queue ordered by nfs4_client.cl_time
299 * for lease renewal.
300 *
301 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
302 * for last close replay.
303 */
304static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
305static int reclaim_str_hashtbl_size = 0;
306static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
307static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head client_lru;
311static struct list_head close_lru;
312
2283963f
BF		 313static void unhash_generic_stateid(struct nfs4_stateid *stp)
314{
315 list_del(&stp->st_hash);
316 list_del(&stp->st_perfile);
317 list_del(&stp->st_perstateowner);
318}
319
320static void free_generic_stateid(struct nfs4_stateid *stp)
321{
322 put_nfs4_file(stp->st_file);
323 kmem_cache_free(stateid_slab, stp);
324}
325
326static void release_lock_stateid(struct nfs4_stateid *stp)
327{
328 unhash_generic_stateid(stp);
329 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
330 free_generic_stateid(stp);
331}
332
333static void release_open_stateid(struct nfs4_stateid *stp)
334{
335 unhash_generic_stateid(stp);
336 release_stateid_lockowners(stp);
337 nfsd_close(stp->st_vfs_file);
338 free_generic_stateid(stp);
339}
340
1da177e4
LT		 341static inline void
342renew_client(struct nfs4_client *clp)
343{
344 /*
345 * Move client to the end to the LRU list.
346 */
347 dprintk("renewing client (clientid %08x/%08x)\n",
348 clp->cl_clientid.cl_boot,
349 clp->cl_clientid.cl_id);
350 list_move_tail(&clp->cl_lru, &client_lru);
351 clp->cl_time = get_seconds();
352}
353
354/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
355static int
356STALE_CLIENTID(clientid_t *clid)
357{
358 if (clid->cl_boot == boot_time)
359 return 0;
360 dprintk("NFSD stale clientid (%08x/%08x)\n",
361 clid->cl_boot, clid->cl_id);
362 return 1;
363}
364
365/*
366 * XXX Should we use a slab cache ?
367 * This type of memory management is somewhat inefficient, but we use it
368 * anyway since SETCLIENTID is not a common operation.
369 */
35bba9a3 370static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 371{
372 struct nfs4_client *clp;
373
35bba9a3
BF		 374 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
375 if (clp == NULL)
376 return NULL;
377 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
378 if (clp->cl_name.data == NULL) {
379 kfree(clp);
380 return NULL;
1da177e4 381 }
35bba9a3
BF		 382 memcpy(clp->cl_name.data, name.data, name.len);
383 clp->cl_name.len = name.len;
1da177e4
LT		 384 return clp;
385}
386
1b1a9b31
BF		 387static void
388shutdown_callback_client(struct nfs4_client *clp)
389{
390 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
391
1b1a9b31 392 if (clnt) {
404ec117
BF		 393 /*
394 * Callback threads take a reference on the client, so there
395 * should be no outstanding callbacks at this point.
396 */
1b1a9b31
BF		 397 clp->cl_callback.cb_client = NULL;
398 rpc_shutdown_client(clnt);
399 }
400}
401
1da177e4
LT		 402static inline void
403free_client(struct nfs4_client *clp)
404{
1b1a9b31 405 shutdown_callback_client(clp);
1da177e4
LT		 406 if (clp->cl_cred.cr_group_info)
407 put_group_info(clp->cl_cred.cr_group_info);
68e76ad0 408 kfree(clp->cl_principal);
1da177e4
LT		 409 kfree(clp->cl_name.data);
410 kfree(clp);
411}
412
413void
414put_nfs4_client(struct nfs4_client *clp)
415{
416 if (atomic_dec_and_test(&clp->cl_count))
417 free_client(clp);
418}
419
420static void
421expire_client(struct nfs4_client *clp)
422{
423 struct nfs4_stateowner *sop;
424 struct nfs4_delegation *dp;
1da177e4
LT		 425 struct list_head reaplist;
426
427 dprintk("NFSD: expire_client cl_count %d\n",
428 atomic_read(&clp->cl_count));
429
1da177e4
LT		 430 INIT_LIST_HEAD(&reaplist);
431 spin_lock(&recall_lock);
ea1da636
N		 432 while (!list_empty(&clp->cl_delegations)) {
433 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 434 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
435 dp->dl_flock);
ea1da636 436 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 437 list_move(&dp->dl_recall_lru, &reaplist);
438 }
439 spin_unlock(&recall_lock);
440 while (!list_empty(&reaplist)) {
441 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
442 list_del_init(&dp->dl_recall_lru);
443 unhash_delegation(dp);
444 }
445 list_del(&clp->cl_idhash);
446 list_del(&clp->cl_strhash);
447 list_del(&clp->cl_lru);
ea1da636
N		 448 while (!list_empty(&clp->cl_openowners)) {
449 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 450 release_stateowner(sop);
451 }
452 put_nfs4_client(clp);
453}
454
35bba9a3
BF		 455static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
456{
1da177e4
LT		 457 struct nfs4_client *clp;
458
35bba9a3
BF		 459 clp = alloc_client(name);
460 if (clp == NULL)
461 return NULL;
a55370a3 462 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 463 atomic_set(&clp->cl_count, 1);
464 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 465 INIT_LIST_HEAD(&clp->cl_idhash);
466 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 467 INIT_LIST_HEAD(&clp->cl_openowners);
468 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 469 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 470 return clp;
471}
472
35bba9a3
BF		 473static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
474{
475 memcpy(target->cl_verifier.data, source->data,
476 sizeof(target->cl_verifier.data));
1da177e4
LT		 477}
478
35bba9a3
BF		 479static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
480{
1da177e4
LT		 481 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
482 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
483}
484
35bba9a3
BF		 485static void copy_cred(struct svc_cred *target, struct svc_cred *source)
486{
1da177e4
LT		 487 target->cr_uid = source->cr_uid;
488 target->cr_gid = source->cr_gid;
489 target->cr_group_info = source->cr_group_info;
490 get_group_info(target->cr_group_info);
491}
492
35bba9a3 493static int same_name(const char *n1, const char *n2)
599e0a22 494{
a55370a3 495 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 496}
497
498static int
599e0a22
BF		 499same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
500{
501 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 502}
503
504static int
599e0a22
BF		 505same_clid(clientid_t *cl1, clientid_t *cl2)
506{
507 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 508}
509
510/* XXX what about NGROUP */
511static int
599e0a22
BF		 512same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
513{
514 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 515}
516
5ec7b46c
BF		 517static void gen_clid(struct nfs4_client *clp)
518{
519 static u32 current_clientid = 1;
520
1da177e4
LT		 521 clp->cl_clientid.cl_boot = boot_time;
522 clp->cl_clientid.cl_id = current_clientid++;
523}
524
deda2faa
BF		 525static void gen_confirm(struct nfs4_client *clp)
526{
527 static u32 i;
528 u32 *p;
1da177e4 529
1da177e4 530 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 531 *p++ = get_seconds();
532 *p++ = i++;
1da177e4
LT		 533}
534
35bba9a3
BF		 535static int check_name(struct xdr_netobj name)
536{
1da177e4
LT		 537 if (name.len == 0)
538 return 0;
539 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 540 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 541 return 0;
542 }
543 return 1;
544}
545
fd39ca9a 546static void
1da177e4
LT		 547add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
548{
549 unsigned int idhashval;
550
551 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
552 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
553 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
554 list_add_tail(&clp->cl_lru, &client_lru);
555 clp->cl_time = get_seconds();
556}
557
fd39ca9a 558static void
1da177e4
LT		 559move_to_confirmed(struct nfs4_client *clp)
560{
561 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
562 unsigned int strhashval;
563
564 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
565 list_del_init(&clp->cl_strhash);
f116629d 566 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 567 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 568 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
569 renew_client(clp);
570}
571
572static struct nfs4_client *
573find_confirmed_client(clientid_t *clid)
574{
575 struct nfs4_client *clp;
576 unsigned int idhashval = clientid_hashval(clid->cl_id);
577
578 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 579 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 580 return clp;
581 }
582 return NULL;
583}
584
585static struct nfs4_client *
586find_unconfirmed_client(clientid_t *clid)
587{
588 struct nfs4_client *clp;
589 unsigned int idhashval = clientid_hashval(clid->cl_id);
590
591 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 592 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 593 return clp;
594 }
595 return NULL;
596}
597
28ce6054
N		 598static struct nfs4_client *
599find_confirmed_client_by_str(const char *dname, unsigned int hashval)
600{
601 struct nfs4_client *clp;
602
603 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
604 if (same_name(clp->cl_recdir, dname))
605 return clp;
606 }
607 return NULL;
608}
609
610static struct nfs4_client *
611find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
612{
613 struct nfs4_client *clp;
614
615 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
616 if (same_name(clp->cl_recdir, dname))
617 return clp;
618 }
619 return NULL;
620}
621
1da177e4
LT		 622/* a helper function for parse_callback */
623static int
624parse_octet(unsigned int *lenp, char **addrp)
625{
626 unsigned int len = *lenp;
627 char *p = *addrp;
628 int n = -1;
629 char c;
630
631 for (;;) {
632 if (!len)
633 break;
634 len--;
635 c = *p++;
636 if (c == '.')
637 break;
638 if ((c < '0') || (c > '9')) {
639 n = -1;
640 break;
641 }
642 if (n < 0)
643 n = 0;
644 n = (n * 10) + (c - '0');
645 if (n > 255) {
646 n = -1;
647 break;
648 }
649 }
650 *lenp = len;
651 *addrp = p;
652 return n;
653}
654
655/* parse and set the setclientid ipv4 callback address */
fd39ca9a 656static int
1da177e4
LT		 657parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
658{
659 int temp = 0;
660 u32 cbaddr = 0;
661 u16 cbport = 0;
662 u32 addrlen = addr_len;
663 char *addr = addr_val;
664 int i, shift;
665
666 /* ipaddress */
667 shift = 24;
668 for(i = 4; i > 0 ; i--) {
669 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
670 return 0;
671 }
672 cbaddr |= (temp << shift);
673 if (shift > 0)
674 shift -= 8;
675 }
676 *cbaddrp = cbaddr;
677
678 /* port */
679 shift = 8;
680 for(i = 2; i > 0 ; i--) {
681 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
682 return 0;
683 }
684 cbport |= (temp << shift);
685 if (shift > 0)
686 shift -= 8;
687 }
688 *cbportp = cbport;
689 return 1;
690}
691
fd39ca9a 692static void
1da177e4
LT		 693gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
694{
695 struct nfs4_callback *cb = &clp->cl_callback;
696
697 /* Currently, we only support tcp for the callback channel */
698 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
699 goto out_err;
700
701 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
702 &cb->cb_addr, &cb->cb_port)))
703 goto out_err;
704 cb->cb_prog = se->se_callback_prog;
705 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 706 return;
707out_err:
849823c5 708 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 709 "will not receive delegations\n",
710 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
711
1da177e4
LT		 712 return;
713}
714
b37ad28b 715__be32
b591480b
BF		 716nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
717 struct nfsd4_setclientid *setclid)
1da177e4 718{
27459f09 719 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 720 struct xdr_netobj clname = {
721 .len = setclid->se_namelen,
722 .data = setclid->se_name,
723 };
724 nfs4_verifier clverifier = setclid->se_verf;
725 unsigned int strhashval;
28ce6054 726 struct nfs4_client *conf, *unconf, *new;
b37ad28b 727 __be32 status;
68e76ad0 728 char *princ;
a55370a3 729 char dname[HEXDIR_LEN];
1da177e4 730
1da177e4 731 if (!check_name(clname))
73aea4ec 732 return nfserr_inval;
1da177e4 733
a55370a3
N		 734 status = nfs4_make_rec_clidname(dname, &clname);
735 if (status)
73aea4ec 736 return status;
a55370a3 737
1da177e4
LT		 738 /*
739 * XXX The Duplicate Request Cache (DRC) has been checked (??)
740 * We get here on a DRC miss.
741 */
742
a55370a3 743 strhashval = clientstr_hashval(dname);
1da177e4 744
1da177e4 745 nfs4_lock_state();
28ce6054
N		 746 conf = find_confirmed_client_by_str(dname, strhashval);
747 if (conf) {
a186e767 748 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 749 status = nfserr_clid_inuse;
599e0a22 750 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 751 || conf->cl_addr != sin->sin_addr.s_addr) {
be859405
HH		 752 dprintk("NFSD: setclientid: string in use by clientat %pI4\n",
753 &conf->cl_addr);
1da177e4
LT		 754 goto out;
755 }
1da177e4 756 }
a186e767
BF		 757 /*
758 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
759 * has a description of SETCLIENTID request processing consisting
760 * of 5 bullet points, labeled as CASE0 - CASE4 below.
761 */
28ce6054 762 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 763 status = nfserr_resource;
764 if (!conf) {
a186e767
BF		 765 /*
766 * RFC 3530 14.2.33 CASE 4:
767 * placed first, because it is the normal case
1da177e4
LT		 768 */
769 if (unconf)
770 expire_client(unconf);
a55370a3
N		 771 new = create_client(clname, dname);
772 if (new == NULL)
1da177e4 773 goto out;
1da177e4 774 gen_clid(new);
599e0a22 775 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 776 /*
a186e767
BF		 777 * RFC 3530 14.2.33 CASE 1:
778 * probable callback update
1da177e4 779 */
31f4a6c1
N		 780 if (unconf) {
781 /* Note this is removing unconfirmed {*x***},
782 * which is stronger than RFC recommended {vxc**}.
783 * This has the advantage that there is at most
784 * one {*x***} in either list at any time.
785 */
786 expire_client(unconf);
1da177e4 787 }
a55370a3
N		 788 new = create_client(clname, dname);
789 if (new == NULL)
1da177e4 790 goto out;
1da177e4 791 copy_clid(new, conf);
1da177e4
LT		 792 } else if (!unconf) {
793 /*
a186e767
BF		 794 * RFC 3530 14.2.33 CASE 2:
795 * probable client reboot; state will be removed if
796 * confirmed.
1da177e4 797 */
a55370a3
N		 798 new = create_client(clname, dname);
799 if (new == NULL)
1da177e4 800 goto out;
1da177e4 801 gen_clid(new);
49ba8781 802 } else {
a186e767
BF		 803 /*
804 * RFC 3530 14.2.33 CASE 3:
805 * probable client reboot; state will be removed if
806 * confirmed.
1da177e4
LT		 807 */
808 expire_client(unconf);
a55370a3
N		 809 new = create_client(clname, dname);
810 if (new == NULL)
1da177e4 811 goto out;
1da177e4 812 gen_clid(new);
1da177e4 813 }
c175b83c
BF		 814 copy_verf(new, &clverifier);
815 new->cl_addr = sin->sin_addr.s_addr;
61054b14 816 new->cl_flavor = rqstp->rq_flavor;
68e76ad0
OK		 817 princ = svc_gss_principal(rqstp);
818 if (princ) {
819 new->cl_principal = kstrdup(princ, GFP_KERNEL);
820 if (new->cl_principal == NULL) {
821 free_client(new);
822 goto out;
823 }
824 }
c175b83c
BF		 825 copy_cred(&new->cl_cred, &rqstp->rq_cred);
826 gen_confirm(new);
827 gen_callback(new, setclid);
828 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 829 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
830 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
831 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
832 status = nfs_ok;
833out:
834 nfs4_unlock_state();
835 return status;
836}
837
838
839/*
a186e767
BF		 840 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
841 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
842 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 843 */
b37ad28b 844__be32
b591480b
BF		 845nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
846 struct nfsd4_compound_state *cstate,
847 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 848{
27459f09 849 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 850 struct nfs4_client *conf, *unconf;
1da177e4
LT		 851 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
852 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 853 __be32 status;
1da177e4
LT		 854
855 if (STALE_CLIENTID(clid))
856 return nfserr_stale_clientid;
857 /*
858 * XXX The Duplicate Request Cache (DRC) has been checked (??)
859 * We get here on a DRC miss.
860 */
861
862 nfs4_lock_state();
21ab45a4
N		 863
864 conf = find_confirmed_client(clid);
865 unconf = find_unconfirmed_client(clid);
866
867 status = nfserr_clid_inuse;
27459f09 868 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 869 goto out;
27459f09 870 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 871 goto out;
872
a186e767
BF		 873 /*
874 * section 14.2.34 of RFC 3530 has a description of
875 * SETCLIENTID_CONFIRM request processing consisting
876 * of 4 bullet points, labeled as CASE1 - CASE4 below.
877 */
366e0c1d 878 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 879 /*
880 * RFC 3530 14.2.34 CASE 1:
881 * callback update
882 */
599e0a22 883 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 884 status = nfserr_clid_inuse;
885 else {
1a69c179
N		 886 /* XXX: We just turn off callbacks until we can handle
887 * change request correctly. */
cb36d634 888 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 889 gen_confirm(conf);
46309029 890 nfsd4_remove_clid_dir(unconf);
1a69c179 891 expire_client(unconf);
1da177e4 892 status = nfs_ok;
1a69c179 893
1da177e4 894 }
f3aba4e5 895 } else if (conf && !unconf) {
a186e767
BF		 896 /*
897 * RFC 3530 14.2.34 CASE 2:
898 * probable retransmitted request; play it safe and
899 * do nothing.
7c79f737 900 */
599e0a22 901 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 902 status = nfserr_clid_inuse;
21ab45a4 903 else
1da177e4 904 status = nfs_ok;
7c79f737 905 } else if (!conf && unconf
599e0a22 906 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 907 /*
908 * RFC 3530 14.2.34 CASE 3:
909 * Normal case; new or rebooted client:
7c79f737 910 */
599e0a22 911 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 912 status = nfserr_clid_inuse;
913 } else {
1a69c179
N		 914 unsigned int hash =
915 clientstr_hashval(unconf->cl_recdir);
916 conf = find_confirmed_client_by_str(unconf->cl_recdir,
917 hash);
918 if (conf) {
c7b9a459 919 nfsd4_remove_clid_dir(conf);
1a69c179
N		 920 expire_client(conf);
921 }
1da177e4 922 move_to_confirmed(unconf);
21ab45a4 923 conf = unconf;
46f8a64b 924 nfsd4_probe_callback(conf);
1a69c179 925 status = nfs_ok;
1da177e4 926 }
599e0a22
BF		 927 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
928 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 929 &confirm)))) {
a186e767
BF		 930 /*
931 * RFC 3530 14.2.34 CASE 4:
932 * Client probably hasn't noticed that we rebooted yet.
7c79f737 933 */
1da177e4 934 status = nfserr_stale_clientid;
7c79f737 935 } else {
08e8987c
N		 936 /* check that we have hit one of the cases...*/
937 status = nfserr_clid_inuse;
938 }
1da177e4 939out:
1da177e4
LT		 940 nfs4_unlock_state();
941 return status;
942}
943
1da177e4
LT		 944/* OPEN Share state helper functions */
945static inline struct nfs4_file *
946alloc_init_file(struct inode *ino)
947{
948 struct nfs4_file *fp;
949 unsigned int hashval = file_hashval(ino);
950
e60d4398
N		 951 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
952 if (fp) {
13cd2184 953 kref_init(&fp->fi_ref);
1da177e4 954 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 955 INIT_LIST_HEAD(&fp->fi_stateids);
956 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 957 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
958 fp->fi_inode = igrab(ino);
959 fp->fi_id = current_fileid++;
47f9940c 960 fp->fi_had_conflict = false;
1da177e4
LT		 961 return fp;
962 }
963 return NULL;
964}
965
e60d4398 966static void
e18b890b 967nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 968{
e60d4398
N		 969 if (*slab == NULL)
970 return;
1a1d92c1 971 kmem_cache_destroy(*slab);
e60d4398 972 *slab = NULL;
1da177e4
LT		 973}
974
e8ff2a84 975void
1da177e4
LT		 976nfsd4_free_slabs(void)
977{
e60d4398
N		 978 nfsd4_free_slab(&stateowner_slab);
979 nfsd4_free_slab(&file_slab);
5ac049ac 980 nfsd4_free_slab(&stateid_slab);
5b2d21c1 981 nfsd4_free_slab(&deleg_slab);
e60d4398 982}
1da177e4 983
e60d4398
N		 984static int
985nfsd4_init_slabs(void)
986{
987 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 988 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 989 if (stateowner_slab == NULL)
990 goto out_nomem;
991 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 992 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 993 if (file_slab == NULL)
994 goto out_nomem;
5ac049ac 995 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 996 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 997 if (stateid_slab == NULL)
998 goto out_nomem;
5b2d21c1 999 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1000 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1001 if (deleg_slab == NULL)
1002 goto out_nomem;
e60d4398
N		 1003 return 0;
1004out_nomem:
1005 nfsd4_free_slabs();
1006 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1007 return -ENOMEM;
1da177e4
LT		 1008}
1009
1010void
1011nfs4_free_stateowner(struct kref *kref)
1012{
1013 struct nfs4_stateowner *sop =
1014 container_of(kref, struct nfs4_stateowner, so_ref);
1015 kfree(sop->so_owner.data);
1016 kmem_cache_free(stateowner_slab, sop);
1017}
1018
1019static inline struct nfs4_stateowner *
1020alloc_stateowner(struct xdr_netobj *owner)
1021{
1022 struct nfs4_stateowner *sop;
1023
1024 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1025 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1026 memcpy(sop->so_owner.data, owner->data, owner->len);
1027 sop->so_owner.len = owner->len;
1028 kref_init(&sop->so_ref);
1029 return sop;
1030 }
1031 kmem_cache_free(stateowner_slab, sop);
1032 }
1033 return NULL;
1034}
1035
1036static struct nfs4_stateowner *
1037alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1038 struct nfs4_stateowner *sop;
1039 struct nfs4_replay *rp;
1040 unsigned int idhashval;
1041
1042 if (!(sop = alloc_stateowner(&open->op_owner)))
1043 return NULL;
1044 idhashval = ownerid_hashval(current_ownerid);
1045 INIT_LIST_HEAD(&sop->so_idhash);
1046 INIT_LIST_HEAD(&sop->so_strhash);
1047 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1048 INIT_LIST_HEAD(&sop->so_stateids);
1049 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1050 INIT_LIST_HEAD(&sop->so_close_lru);
1051 sop->so_time = 0;
1052 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1053 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1054 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1055 sop->so_is_open_owner = 1;
1056 sop->so_id = current_ownerid++;
1057 sop->so_client = clp;
1058 sop->so_seqid = open->op_seqid;
1059 sop->so_confirmed = 0;
1060 rp = &sop->so_replay;
de1ae286 1061 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1062 rp->rp_buflen = 0;
1063 rp->rp_buf = rp->rp_ibuf;
1064 return sop;
1065}
1066
1067static void
1068release_stateid_lockowners(struct nfs4_stateid *open_stp)
1069{
1070 struct nfs4_stateowner *lock_sop;
1071
ea1da636
N		 1072 while (!list_empty(&open_stp->st_lockowners)) {
1073 lock_sop = list_entry(open_stp->st_lockowners.next,
1074 struct nfs4_stateowner, so_perstateid);
1075 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1076 BUG_ON(lock_sop->so_is_open_owner);
1077 release_stateowner(lock_sop);
1078 }
1079}
1080
1081static void
1082unhash_stateowner(struct nfs4_stateowner *sop)
1083{
1084 struct nfs4_stateid *stp;
1085
1086 list_del(&sop->so_idhash);
1087 list_del(&sop->so_strhash);
6fa305de 1088 if (sop->so_is_open_owner)
1da177e4 1089 list_del(&sop->so_perclient);
ea1da636
N		 1090 list_del(&sop->so_perstateid);
1091 while (!list_empty(&sop->so_stateids)) {
1092 stp = list_entry(sop->so_stateids.next,
1093 struct nfs4_stateid, st_perstateowner);
1da177e4 1094 if (sop->so_is_open_owner)
2283963f 1095 release_open_stateid(stp);
1da177e4 1096 else
2283963f 1097 release_lock_stateid(stp);
1da177e4
LT		 1098 }
1099}
1100
1101static void
1102release_stateowner(struct nfs4_stateowner *sop)
1103{
1104 unhash_stateowner(sop);
1105 list_del(&sop->so_close_lru);
1106 nfs4_put_stateowner(sop);
1107}
1108
1109static inline void
1110init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1111 struct nfs4_stateowner *sop = open->op_stateowner;
1112 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1113
1114 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1115 INIT_LIST_HEAD(&stp->st_perstateowner);
1116 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1117 INIT_LIST_HEAD(&stp->st_perfile);
1118 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1119 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1120 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1121 stp->st_stateowner = sop;
13cd2184 1122 get_nfs4_file(fp);
1da177e4
LT		 1123 stp->st_file = fp;
1124 stp->st_stateid.si_boot = boot_time;
1125 stp->st_stateid.si_stateownerid = sop->so_id;
1126 stp->st_stateid.si_fileid = fp->fi_id;
1127 stp->st_stateid.si_generation = 0;
1128 stp->st_access_bmap = 0;
1129 stp->st_deny_bmap = 0;
1130 __set_bit(open->op_share_access, &stp->st_access_bmap);
1131 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1132 stp->st_openstp = NULL;
1da177e4
LT		 1133}
1134
fd39ca9a 1135static void
1da177e4
LT		 1136move_to_close_lru(struct nfs4_stateowner *sop)
1137{
1138 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1139
358dd55a 1140 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1141 sop->so_time = get_seconds();
1142}
1143
1da177e4 1144static int
599e0a22
BF		 1145same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1146 clientid_t *clid)
1147{
1148 return (sop->so_owner.len == owner->len) &&
1149 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1150 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1151}
1152
1153static struct nfs4_stateowner *
1154find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1155{
1156 struct nfs4_stateowner *so = NULL;
1157
1158 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1159 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1160 return so;
1161 }
1162 return NULL;
1163}
1164
1165/* search file_hashtbl[] for file */
1166static struct nfs4_file *
1167find_file(struct inode *ino)
1168{
1169 unsigned int hashval = file_hashval(ino);
1170 struct nfs4_file *fp;
1171
1172 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1173 if (fp->fi_inode == ino) {
1174 get_nfs4_file(fp);
1da177e4 1175 return fp;
13cd2184 1176 }
1da177e4
LT		 1177 }
1178 return NULL;
1179}
1180
8838dc43 1181static inline int access_valid(u32 x)
ba5a6a19 1182{
8838dc43
BF		 1183 if (x < NFS4_SHARE_ACCESS_READ)
1184 return 0;
1185 if (x > NFS4_SHARE_ACCESS_BOTH)
1186 return 0;
1187 return 1;
ba5a6a19
BF		 1188}
1189
8838dc43 1190static inline int deny_valid(u32 x)
ba5a6a19 1191{
8838dc43
BF		 1192 /* Note: unlike access bits, deny bits may be zero. */
1193 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1194}
1da177e4 1195
4f83aa30
BF		 1196/*
1197 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1198 * st_{access,deny}_bmap field of the stateid, in order to track not
1199 * only what share bits are currently in force, but also what
1200 * combinations of share bits previous opens have used. This allows us
1201 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1202 * return an error if the client attempt to downgrade to a combination
1203 * of share bits not explicable by closing some of its previous opens.
1204 *
1205 * XXX: This enforcement is actually incomplete, since we don't keep
1206 * track of access/deny bit combinations; so, e.g., we allow:
1207 *
1208 * OPEN allow read, deny write
1209 * OPEN allow both, deny none
1210 * DOWNGRADE allow read, deny none
1211 *
1212 * which we should reject.
1213 */
fd39ca9a 1214static void
1da177e4
LT		 1215set_access(unsigned int *access, unsigned long bmap) {
1216 int i;
1217
1218 *access = 0;
1219 for (i = 1; i < 4; i++) {
1220 if (test_bit(i, &bmap))
1221 *access |= i;
1222 }
1223}
1224
fd39ca9a 1225static void
1da177e4
LT		 1226set_deny(unsigned int *deny, unsigned long bmap) {
1227 int i;
1228
1229 *deny = 0;
1230 for (i = 0; i < 4; i++) {
1231 if (test_bit(i, &bmap))
1232 *deny |= i ;
1233 }
1234}
1235
1236static int
1237test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1238 unsigned int access, deny;
1239
1240 set_access(&access, stp->st_access_bmap);
1241 set_deny(&deny, stp->st_deny_bmap);
1242 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1243 return 0;
1244 return 1;
1245}
1246
1247/*
1248 * Called to check deny when READ with all zero stateid or
1249 * WRITE with all zero or all one stateid
1250 */
b37ad28b 1251static __be32
1da177e4
LT		 1252nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1253{
1254 struct inode *ino = current_fh->fh_dentry->d_inode;
1255 struct nfs4_file *fp;
1256 struct nfs4_stateid *stp;
b37ad28b 1257 __be32 ret;
1da177e4
LT		 1258
1259 dprintk("NFSD: nfs4_share_conflict\n");
1260
1261 fp = find_file(ino);
13cd2184
N		 1262 if (!fp)
1263 return nfs_ok;
b700949b 1264 ret = nfserr_locked;
1da177e4 1265 /* Search for conflicting share reservations */
13cd2184
N		 1266 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1267 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1268 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1269 goto out;
1da177e4 1270 }
13cd2184
N		 1271 ret = nfs_ok;
1272out:
1273 put_nfs4_file(fp);
1274 return ret;
1da177e4
LT		 1275}
1276
1277static inline void
1278nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1279{
1280 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
aceaf78d 1281 drop_file_write_access(filp);
1da177e4
LT		 1282 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1283 }
1284}
1285
1286/*
1287 * Recall a delegation
1288 */
1289static int
1290do_recall(void *__dp)
1291{
1292 struct nfs4_delegation *dp = __dp;
1293
47f9940c 1294 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1295 nfsd4_cb_recall(dp);
1296 return 0;
1297}
1298
1299/*
1300 * Spawn a thread to perform a recall on the delegation represented
1301 * by the lease (file_lock)
1302 *
1303 * Called from break_lease() with lock_kernel() held.
1304 * Note: we assume break_lease will only call this *once* for any given
1305 * lease.
1306 */
1307static
1308void nfsd_break_deleg_cb(struct file_lock *fl)
1309{
1310 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1311 struct task_struct *t;
1312
1313 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1314 if (!dp)
1315 return;
1316
1317 /* We're assuming the state code never drops its reference
1318 * without first removing the lease. Since we're in this lease
1319 * callback (and since the lease code is serialized by the kernel
1320 * lock) we know the server hasn't removed the lease yet, we know
1321 * it's safe to take a reference: */
1322 atomic_inc(&dp->dl_count);
cfdcad4d 1323 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1324
1325 spin_lock(&recall_lock);
1326 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1327 spin_unlock(&recall_lock);
1328
1329 /* only place dl_time is set. protected by lock_kernel*/
1330 dp->dl_time = get_seconds();
1331
0272e1fd
BF		 1332 /*
1333 * We don't want the locks code to timeout the lease for us;
1334 * we'll remove it ourself if the delegation isn't returned
1335 * in time.
1336 */
1337 fl->fl_break_time = 0;
1da177e4
LT		 1338
1339 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1340 if (IS_ERR(t)) {
1341 struct nfs4_client *clp = dp->dl_client;
1342
1343 printk(KERN_INFO "NFSD: Callback thread failed for "
1344 "for client (clientid %08x/%08x)\n",
1345 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1346 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1347 nfs4_put_delegation(dp);
1348 }
1349}
1350
1351/*
1352 * The file_lock is being reapd.
1353 *
1354 * Called by locks_free_lock() with lock_kernel() held.
1355 */
1356static
1357void nfsd_release_deleg_cb(struct file_lock *fl)
1358{
1359 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1360
1361 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1362
1363 if (!(fl->fl_flags & FL_LEASE) || !dp)
1364 return;
1365 dp->dl_flock = NULL;
1366}
1367
1368/*
1369 * Set the delegation file_lock back pointer.
1370 *
a9933cea 1371 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1372 */
1373static
1374void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1375{
1376 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1377
1378 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1379 if (!dp)
1380 return;
1381 dp->dl_flock = new;
1382}
1383
1384/*
a9933cea 1385 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1386 */
1387static
1388int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1389{
1390 struct nfs4_delegation *onlistd =
1391 (struct nfs4_delegation *)onlist->fl_owner;
1392 struct nfs4_delegation *tryd =
1393 (struct nfs4_delegation *)try->fl_owner;
1394
1395 if (onlist->fl_lmops != try->fl_lmops)
1396 return 0;
1397
1398 return onlistd->dl_client == tryd->dl_client;
1399}
1400
1401
1402static
1403int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1404{
1405 if (arg & F_UNLCK)
1406 return lease_modify(onlist, arg);
1407 else
1408 return -EAGAIN;
1409}
1410
fd39ca9a 1411static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1412 .fl_break = nfsd_break_deleg_cb,
1413 .fl_release_private = nfsd_release_deleg_cb,
1414 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1415 .fl_mylease = nfsd_same_client_deleg_cb,
1416 .fl_change = nfsd_change_deleg_cb,
1417};
1418
1419
b37ad28b 1420__be32
1da177e4
LT		 1421nfsd4_process_open1(struct nfsd4_open *open)
1422{
1da177e4
LT		 1423 clientid_t *clientid = &open->op_clientid;
1424 struct nfs4_client *clp = NULL;
1425 unsigned int strhashval;
1426 struct nfs4_stateowner *sop = NULL;
1427
1da177e4 1428 if (!check_name(open->op_owner))
0f442aa2 1429 return nfserr_inval;
1da177e4
LT		 1430
1431 if (STALE_CLIENTID(&open->op_clientid))
1432 return nfserr_stale_clientid;
1433
1434 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1435 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1436 open->op_stateowner = sop;
1437 if (!sop) {
1438 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1439 clp = find_confirmed_client(clientid);
1440 if (clp == NULL)
0f442aa2
BF		 1441 return nfserr_expired;
1442 goto renew;
1da177e4 1443 }
0f442aa2
BF		 1444 if (!sop->so_confirmed) {
1445 /* Replace unconfirmed owners without checking for replay. */
1446 clp = sop->so_client;
1447 release_stateowner(sop);
1448 open->op_stateowner = NULL;
1449 goto renew;
1450 }
1451 if (open->op_seqid == sop->so_seqid - 1) {
1452 if (sop->so_replay.rp_buflen)
a90b061c 1453 return nfserr_replay_me;
0f442aa2
BF		 1454 /* The original OPEN failed so spectacularly
1455 * that we don't even have replay data saved!
1456 * Therefore, we have no choice but to continue
1457 * processing this OPEN; presumably, we'll
1458 * fail again for the same reason.
1459 */
1460 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1461 goto renew;
1462 }
1463 if (open->op_seqid != sop->so_seqid)
1464 return nfserr_bad_seqid;
1da177e4 1465renew:
0f442aa2
BF		 1466 if (open->op_stateowner == NULL) {
1467 sop = alloc_init_open_stateowner(strhashval, clp, open);
1468 if (sop == NULL)
1469 return nfserr_resource;
1470 open->op_stateowner = sop;
1471 }
1472 list_del_init(&sop->so_close_lru);
1da177e4 1473 renew_client(sop->so_client);
0f442aa2 1474 return nfs_ok;
1da177e4
LT		 1475}
1476
b37ad28b 1477static inline __be32
4a6e43e6
N		 1478nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1479{
1480 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1481 return nfserr_openmode;
1482 else
1483 return nfs_ok;
1484}
1485
52f4fb43
N		 1486static struct nfs4_delegation *
1487find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1488{
1489 struct nfs4_delegation *dp;
1490
ea1da636 1491 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1492 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1493 return dp;
1494 }
1495 return NULL;
1496}
1497
b37ad28b 1498static __be32
567d9829
N		 1499nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1500 struct nfs4_delegation **dp)
1501{
1502 int flags;
b37ad28b 1503 __be32 status = nfserr_bad_stateid;
567d9829
N		 1504
1505 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1506 if (*dp == NULL)
c44c5eeb 1507 goto out;
567d9829
N		 1508 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1509 RD_STATE : WR_STATE;
1510 status = nfs4_check_delegmode(*dp, flags);
1511 if (status)
1512 *dp = NULL;
c44c5eeb
N		 1513out:
1514 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1515 return nfs_ok;
1516 if (status)
1517 return status;
1518 open->op_stateowner->so_confirmed = 1;
1519 return nfs_ok;
567d9829
N		 1520}
1521
b37ad28b 1522static __be32
1da177e4
LT		 1523nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1524{
1525 struct nfs4_stateid *local;
b37ad28b 1526 __be32 status = nfserr_share_denied;
1da177e4
LT		 1527 struct nfs4_stateowner *sop = open->op_stateowner;
1528
8beefa24 1529 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1530 /* ignore lock owners */
1531 if (local->st_stateowner->so_is_open_owner == 0)
1532 continue;
1533 /* remember if we have seen this open owner */
1534 if (local->st_stateowner == sop)
1535 *stpp = local;
1536 /* check for conflicting share reservations */
1537 if (!test_share(local, open))
1538 goto out;
1539 }
1540 status = 0;
1541out:
1542 return status;
1543}
1544
5ac049ac
N		 1545static inline struct nfs4_stateid *
1546nfs4_alloc_stateid(void)
1547{
1548 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1549}
1550
b37ad28b 1551static __be32
1da177e4 1552nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1553 struct nfs4_delegation *dp,
1da177e4
LT		 1554 struct svc_fh *cur_fh, int flags)
1555{
1556 struct nfs4_stateid *stp;
1da177e4 1557
5ac049ac 1558 stp = nfs4_alloc_stateid();
1da177e4
LT		 1559 if (stp == NULL)
1560 return nfserr_resource;
1561
567d9829
N		 1562 if (dp) {
1563 get_file(dp->dl_vfs_file);
1564 stp->st_vfs_file = dp->dl_vfs_file;
1565 } else {
b37ad28b 1566 __be32 status;
567d9829
N		 1567 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1568 &stp->st_vfs_file);
1569 if (status) {
1570 if (status == nfserr_dropit)
1571 status = nfserr_jukebox;
5ac049ac 1572 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1573 return status;
1574 }
1da177e4 1575 }
1da177e4
LT		 1576 *stpp = stp;
1577 return 0;
1578}
1579
b37ad28b 1580static inline __be32
1da177e4
LT		 1581nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1582 struct nfsd4_open *open)
1583{
1584 struct iattr iattr = {
1585 .ia_valid = ATTR_SIZE,
1586 .ia_size = 0,
1587 };
1588 if (!open->op_truncate)
1589 return 0;
1590 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1591 return nfserr_inval;
1da177e4
LT		 1592 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1593}
1594
b37ad28b 1595static __be32
1da177e4
LT		 1596nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1597{
1598 struct file *filp = stp->st_vfs_file;
7eaa36e2 1599 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1600 unsigned int share_access, new_writer;
b37ad28b 1601 __be32 status;
1da177e4
LT		 1602
1603 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1604 new_writer = (~share_access) & open->op_share_access
1605 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1606
6c26d08f 1607 if (new_writer) {
b37ad28b
AV		 1608 int err = get_write_access(inode);
1609 if (err)
1610 return nfserrno(err);
e518f056
BH		 1611 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1612 if (err)
1613 return nfserrno(err);
1614 file_take_write(filp);
6c26d08f 1615 }
1da177e4
LT		 1616 status = nfsd4_truncate(rqstp, cur_fh, open);
1617 if (status) {
6c26d08f
BF		 1618 if (new_writer)
1619 put_write_access(inode);
1da177e4
LT		 1620 return status;
1621 }
1622 /* remember the open */
6c26d08f 1623 filp->f_mode |= open->op_share_access;
b55e0ba1
BF		 1624 __set_bit(open->op_share_access, &stp->st_access_bmap);
1625 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1da177e4
LT		 1626
1627 return nfs_ok;
1628}
1629
1630
1da177e4 1631static void
37515177 1632nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1633{
37515177
N		 1634 open->op_stateowner->so_confirmed = 1;
1635 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1636}
1637
1638/*
1639 * Attempt to hand out a delegation.
1640 */
1641static void
1642nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1643{
1644 struct nfs4_delegation *dp;
1645 struct nfs4_stateowner *sop = stp->st_stateowner;
1646 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1647 struct file_lock fl, *flp = &fl;
1648 int status, flag = 0;
1649
1650 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1651 open->op_recall = 0;
1652 switch (open->op_claim_type) {
1653 case NFS4_OPEN_CLAIM_PREVIOUS:
1654 if (!atomic_read(&cb->cb_set))
1655 open->op_recall = 1;
1656 flag = open->op_delegate_type;
1657 if (flag == NFS4_OPEN_DELEGATE_NONE)
1658 goto out;
1659 break;
1660 case NFS4_OPEN_CLAIM_NULL:
1661 /* Let's not give out any delegations till everyone's
1662 * had the chance to reclaim theirs.... */
af558e33 1663 if (locks_in_grace())
7b190fec
N		 1664 goto out;
1665 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1666 goto out;
1667 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1668 flag = NFS4_OPEN_DELEGATE_WRITE;
1669 else
1670 flag = NFS4_OPEN_DELEGATE_READ;
1671 break;
1672 default:
1673 goto out;
1674 }
1da177e4
LT		 1675
1676 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1677 if (dp == NULL) {
1678 flag = NFS4_OPEN_DELEGATE_NONE;
1679 goto out;
1680 }
1681 locks_init_lock(&fl);
1682 fl.fl_lmops = &nfsd_lease_mng_ops;
1683 fl.fl_flags = FL_LEASE;
9167f501 1684 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1da177e4
LT		 1685 fl.fl_end = OFFSET_MAX;
1686 fl.fl_owner = (fl_owner_t)dp;
1687 fl.fl_file = stp->st_vfs_file;
1688 fl.fl_pid = current->tgid;
1689
a9933cea 1690 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1691 * the lock_manager callbacks fl_mylease and fl_change are used
1692 */
9167f501 1693 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1da177e4 1694 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1695 unhash_delegation(dp);
1da177e4
LT		 1696 flag = NFS4_OPEN_DELEGATE_NONE;
1697 goto out;
1698 }
1699
1700 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1701
1702 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1703 dp->dl_stateid.si_boot,
1704 dp->dl_stateid.si_stateownerid,
1705 dp->dl_stateid.si_fileid,
1706 dp->dl_stateid.si_generation);
1707out:
7b190fec
N		 1708 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1709 && flag == NFS4_OPEN_DELEGATE_NONE
1710 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1711 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1712 open->op_delegate_type = flag;
1713}
1714
1715/*
1716 * called with nfs4_lock_state() held.
1717 */
b37ad28b 1718__be32
1da177e4
LT		 1719nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1720{
1721 struct nfs4_file *fp = NULL;
1722 struct inode *ino = current_fh->fh_dentry->d_inode;
1723 struct nfs4_stateid *stp = NULL;
567d9829 1724 struct nfs4_delegation *dp = NULL;
b37ad28b 1725 __be32 status;
1da177e4
LT		 1726
1727 status = nfserr_inval;
ba5a6a19
BF		 1728 if (!access_valid(open->op_share_access)
1729 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1730 goto out;
1731 /*
1732 * Lookup file; if found, lookup stateid and check open request,
1733 * and check for delegations in the process of being recalled.
1734 * If not found, create the nfs4_file struct
1735 */
1736 fp = find_file(ino);
1737 if (fp) {
1738 if ((status = nfs4_check_open(fp, open, &stp)))
1739 goto out;
c44c5eeb
N		 1740 status = nfs4_check_deleg(fp, open, &dp);
1741 if (status)
1742 goto out;
1da177e4 1743 } else {
c44c5eeb
N		 1744 status = nfserr_bad_stateid;
1745 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1746 goto out;
1da177e4
LT		 1747 status = nfserr_resource;
1748 fp = alloc_init_file(ino);
1749 if (fp == NULL)
1750 goto out;
1751 }
1752
1753 /*
1754 * OPEN the file, or upgrade an existing OPEN.
1755 * If truncate fails, the OPEN fails.
1756 */
1757 if (stp) {
1758 /* Stateid was found, this is an OPEN upgrade */
1759 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1760 if (status)
1761 goto out;
444c2c07 1762 update_stateid(&stp->st_stateid);
1da177e4
LT		 1763 } else {
1764 /* Stateid was not found, this is a new OPEN */
1765 int flags = 0;
9ecb6a08 1766 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
8837abca 1767 flags |= NFSD_MAY_READ;
1da177e4 1768 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
8837abca 1769 flags |= NFSD_MAY_WRITE;
567d9829
N		 1770 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1771 if (status)
1da177e4
LT		 1772 goto out;
1773 init_stateid(stp, fp, open);
1774 status = nfsd4_truncate(rqstp, current_fh, open);
1775 if (status) {
2283963f 1776 release_open_stateid(stp);
1da177e4
LT		 1777 goto out;
1778 }
1779 }
1780 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1781
1782 /*
1783 * Attempt to hand out a delegation. No error return, because the
1784 * OPEN succeeds even if we fail.
1785 */
1786 nfs4_open_delegation(current_fh, open, stp);
1787
1788 status = nfs_ok;
1789
1790 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1791 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1792 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1793out:
13cd2184
N		 1794 if (fp)
1795 put_nfs4_file(fp);
37515177
N		 1796 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1797 nfs4_set_claim_prev(open);
1da177e4
LT		 1798 /*
1799 * To finish the open response, we just need to set the rflags.
1800 */
1801 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1802 if (!open->op_stateowner->so_confirmed)
1803 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1804
1805 return status;
1806}
1807
b37ad28b 1808__be32
b591480b
BF		 1809nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1810 clientid_t *clid)
1da177e4
LT		 1811{
1812 struct nfs4_client *clp;
b37ad28b 1813 __be32 status;
1da177e4
LT		 1814
1815 nfs4_lock_state();
1816 dprintk("process_renew(%08x/%08x): starting\n",
1817 clid->cl_boot, clid->cl_id);
1818 status = nfserr_stale_clientid;
1819 if (STALE_CLIENTID(clid))
1820 goto out;
1821 clp = find_confirmed_client(clid);
1822 status = nfserr_expired;
1823 if (clp == NULL) {
1824 /* We assume the client took too long to RENEW. */
1825 dprintk("nfsd4_renew: clientid not found!\n");
1826 goto out;
1827 }
1828 renew_client(clp);
1829 status = nfserr_cb_path_down;
ea1da636 1830 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1831 && !atomic_read(&clp->cl_callback.cb_set))
1832 goto out;
1833 status = nfs_ok;
1834out:
1835 nfs4_unlock_state();
1836 return status;
1837}
1838
af558e33
BF		 1839struct lock_manager nfsd4_manager = {
1840};
1841
a76b4319 1842static void
af558e33 1843nfsd4_end_grace(void)
a76b4319
N		 1844{
1845 dprintk("NFSD: end of grace period\n");
c7b9a459 1846 nfsd4_recdir_purge_old();
af558e33 1847 locks_end_grace(&nfsd4_manager);
a76b4319
N		 1848}
1849
fd39ca9a 1850static time_t
1da177e4
LT		 1851nfs4_laundromat(void)
1852{
1853 struct nfs4_client *clp;
1854 struct nfs4_stateowner *sop;
1855 struct nfs4_delegation *dp;
1856 struct list_head *pos, *next, reaplist;
1857 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1858 time_t t, clientid_val = NFSD_LEASE_TIME;
1859 time_t u, test_val = NFSD_LEASE_TIME;
1860
1861 nfs4_lock_state();
1862
1863 dprintk("NFSD: laundromat service - starting\n");
af558e33
BF		 1864 if (locks_in_grace())
1865 nfsd4_end_grace();
1da177e4
LT		 1866 list_for_each_safe(pos, next, &client_lru) {
1867 clp = list_entry(pos, struct nfs4_client, cl_lru);
1868 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1869 t = clp->cl_time - cutoff;
1870 if (clientid_val > t)
1871 clientid_val = t;
1872 break;
1873 }
1874 dprintk("NFSD: purging unused client (clientid %08x)\n",
1875 clp->cl_clientid.cl_id);
c7b9a459 1876 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1877 expire_client(clp);
1878 }
1879 INIT_LIST_HEAD(&reaplist);
1880 spin_lock(&recall_lock);
1881 list_for_each_safe(pos, next, &del_recall_lru) {
1882 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1883 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1884 u = dp->dl_time - cutoff;
1885 if (test_val > u)
1886 test_val = u;
1887 break;
1888 }
1889 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1890 dp, dp->dl_flock);
1891 list_move(&dp->dl_recall_lru, &reaplist);
1892 }
1893 spin_unlock(&recall_lock);
1894 list_for_each_safe(pos, next, &reaplist) {
1895 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1896 list_del_init(&dp->dl_recall_lru);
1897 unhash_delegation(dp);
1898 }
1899 test_val = NFSD_LEASE_TIME;
1900 list_for_each_safe(pos, next, &close_lru) {
1901 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1902 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1903 u = sop->so_time - cutoff;
1904 if (test_val > u)
1905 test_val = u;
1906 break;
1907 }
1908 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1909 sop->so_id);
358dd55a 1910 release_stateowner(sop);
1da177e4
LT		 1911 }
1912 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1913 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1914 nfs4_unlock_state();
1915 return clientid_val;
1916}
1917
a254b246
HH		 1918static struct workqueue_struct *laundry_wq;
1919static void laundromat_main(struct work_struct *);
1920static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1921
1922static void
c4028958 1923laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1924{
1925 time_t t;
1926
1927 t = nfs4_laundromat();
1928 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1929 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1930}
1931
fd39ca9a 1932static struct nfs4_stateowner *
f8816512
N		 1933search_close_lru(u32 st_id, int flags)
1934{
1da177e4
LT		 1935 struct nfs4_stateowner *local = NULL;
1936
1da177e4
LT		 1937 if (flags & CLOSE_STATE) {
1938 list_for_each_entry(local, &close_lru, so_close_lru) {
1939 if (local->so_id == st_id)
1940 return local;
1941 }
1942 }
1943 return NULL;
1944}
1945
1946static inline int
1947nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1948{
7eaa36e2 1949 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1950}
1951
1952static int
1953STALE_STATEID(stateid_t *stateid)
1954{
1955 if (stateid->si_boot == boot_time)
1956 return 0;
849823c5 1957 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1958 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1959 stateid->si_generation);
1960 return 1;
1961}
1962
1963static inline int
1964access_permit_read(unsigned long access_bmap)
1965{
1966 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1967 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1968 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1969}
1970
1971static inline int
1972access_permit_write(unsigned long access_bmap)
1973{
1974 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1975 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1976}
1977
1978static
b37ad28b 1979__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1980{
b37ad28b 1981 __be32 status = nfserr_openmode;
1da177e4
LT		 1982
1983 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1984 goto out;
1985 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1986 goto out;
1987 status = nfs_ok;
1988out:
1989 return status;
1990}
1991
b37ad28b 1992static inline __be32
1da177e4
LT		 1993check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1994{
1995 /* Trying to call delegreturn with a special stateid? Yuch: */
1996 if (!(flags & (RD_STATE | WR_STATE)))
1997 return nfserr_bad_stateid;
1998 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1999 return nfs_ok;
af558e33 2000 else if (locks_in_grace()) {
1da177e4
LT		 2001 /* Answer in remaining cases depends on existance of
2002 * conflicting state; so we must wait out the grace period. */
2003 return nfserr_grace;
2004 } else if (flags & WR_STATE)
2005 return nfs4_share_conflict(current_fh,
2006 NFS4_SHARE_DENY_WRITE);
2007 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2008 return nfs4_share_conflict(current_fh,
2009 NFS4_SHARE_DENY_READ);
2010}
2011
2012/*
2013 * Allow READ/WRITE during grace period on recovered state only for files
2014 * that are not able to provide mandatory locking.
2015 */
2016static inline int
2017io_during_grace_disallowed(struct inode *inode, int flags)
2018{
af558e33 2019 return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 2020 && mandatory_lock(inode);
1da177e4
LT		 2021}
2022
0836f587
BF		 2023static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2024{
2025 /* If the client sends us a stateid from the future, it's buggy: */
2026 if (in->si_generation > ref->si_generation)
2027 return nfserr_bad_stateid;
2028 /*
2029 * The following, however, can happen. For example, if the
2030 * client sends an open and some IO at the same time, the open
2031 * may bump si_generation while the IO is still in flight.
2032 * Thanks to hard links and renames, the client never knows what
2033 * file an open will affect. So it could avoid that situation
2034 * only by serializing all opens and IO from the same open
2035 * owner. To recover from the old_stateid error, the client
2036 * will just have to retry the IO:
2037 */
2038 if (in->si_generation < ref->si_generation)
2039 return nfserr_old_stateid;
2040 return nfs_ok;
2041}
2042
1da177e4
LT		 2043/*
2044* Checks for stateid operations
2045*/
b37ad28b 2046__be32
1da177e4
LT		 2047nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2048{
2049 struct nfs4_stateid *stp = NULL;
2050 struct nfs4_delegation *dp = NULL;
2051 stateid_t *stidp;
2052 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2053 __be32 status;
1da177e4
LT		 2054
2055 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2056 stateid->si_boot, stateid->si_stateownerid,
2057 stateid->si_fileid, stateid->si_generation);
2058 if (filpp)
2059 *filpp = NULL;
2060
2061 if (io_during_grace_disallowed(ino, flags))
2062 return nfserr_grace;
2063
2064 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2065 return check_special_stateids(current_fh, stateid, flags);
2066
2067 /* STALE STATEID */
2068 status = nfserr_stale_stateid;
2069 if (STALE_STATEID(stateid))
2070 goto out;
2071
2072 /* BAD STATEID */
2073 status = nfserr_bad_stateid;
2074 if (!stateid->si_fileid) { /* delegation stateid */
2075 if(!(dp = find_delegation_stateid(ino, stateid))) {
2076 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2077 goto out;
2078 }
2079 stidp = &dp->dl_stateid;
2080 } else { /* open or lock stateid */
2081 if (!(stp = find_stateid(stateid, flags))) {
2082 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2083 goto out;
2084 }
2085 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2086 goto out;
2087 if (!stp->st_stateowner->so_confirmed)
2088 goto out;
2089 stidp = &stp->st_stateid;
2090 }
0836f587
BF		 2091 status = check_stateid_generation(stateid, stidp);
2092 if (status)
1da177e4
LT		 2093 goto out;
2094 if (stp) {
2095 if ((status = nfs4_check_openmode(stp,flags)))
2096 goto out;
2097 renew_client(stp->st_stateowner->so_client);
2098 if (filpp)
2099 *filpp = stp->st_vfs_file;
6a85fa3a 2100 } else {
1da177e4
LT		 2101 if ((status = nfs4_check_delegmode(dp, flags)))
2102 goto out;
2103 renew_client(dp->dl_client);
2104 if (flags & DELEG_RET)
2105 unhash_delegation(dp);
2106 if (filpp)
2107 *filpp = dp->dl_vfs_file;
2108 }
2109 status = nfs_ok;
2110out:
2111 return status;
2112}
2113
4c4cd222
N		 2114static inline int
2115setlkflg (int type)
2116{
2117 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2118 RD_STATE : WR_STATE;
2119}
1da177e4
LT		 2120
2121/*
2122 * Checks for sequence id mutating operations.
2123 */
b37ad28b 2124static __be32
4c4cd222 2125nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
1da177e4 2126{
1da177e4
LT		 2127 struct nfs4_stateid *stp;
2128 struct nfs4_stateowner *sop;
0836f587 2129 __be32 status;
1da177e4
LT		 2130
2131 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2132 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2133 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2134 stateid->si_generation);
3a4f98bb 2135
1da177e4
LT		 2136 *stpp = NULL;
2137 *sopp = NULL;
2138
1da177e4 2139 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2140 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2141 return nfserr_bad_stateid;
1da177e4
LT		 2142 }
2143
1da177e4 2144 if (STALE_STATEID(stateid))
3a4f98bb 2145 return nfserr_stale_stateid;
1da177e4
LT		 2146 /*
2147 * We return BAD_STATEID if filehandle doesn't match stateid,
2148 * the confirmed flag is incorrecly set, or the generation
2149 * number is incorrect.
1da177e4 2150 */
f8816512
N		 2151 stp = find_stateid(stateid, flags);
2152 if (stp == NULL) {
2153 /*
2154 * Also, we should make sure this isn't just the result of
2155 * a replayed close:
2156 */
2157 sop = search_close_lru(stateid->si_stateownerid, flags);
2158 if (sop == NULL)
2159 return nfserr_bad_stateid;
2160 *sopp = sop;
2161 goto check_replay;
2162 }
1da177e4 2163
39325bd0
BF		 2164 *stpp = stp;
2165 *sopp = sop = stp->st_stateowner;
2166
4c4cd222 2167 if (lock) {
4c4cd222 2168 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2169 struct nfs4_client *clp = sop->so_client;
4c4cd222 2170 int lkflg = 0;
b37ad28b 2171 __be32 status;
4c4cd222
N		 2172
2173 lkflg = setlkflg(lock->lk_type);
2174
2175 if (lock->lk_is_new) {
599e0a22
BF		 2176 if (!sop->so_is_open_owner)
2177 return nfserr_bad_stateid;
2178 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2179 return nfserr_bad_stateid;
599e0a22
BF		 2180 /* stp is the open stateid */
2181 status = nfs4_check_openmode(stp, lkflg);
2182 if (status)
2183 return status;
2184 } else {
2185 /* stp is the lock stateid */
2186 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2187 if (status)
2188 return status;
4c4cd222 2189 }
1da177e4
LT		 2190 }
2191
f3362737 2192 if (nfs4_check_fh(current_fh, stp)) {
2fdada03 2193 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2194 return nfserr_bad_stateid;
1da177e4
LT		 2195 }
2196
1da177e4
LT		 2197 /*
2198 * We now validate the seqid and stateid generation numbers.
2199 * For the moment, we ignore the possibility of
2200 * generation number wraparound.
2201 */
bd9aac52 2202 if (seqid != sop->so_seqid)
1da177e4
LT		 2203 goto check_replay;
2204
3a4f98bb 2205 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2206 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2207 " unconfirmed stateowner!\n");
2208 return nfserr_bad_stateid;
1da177e4 2209 }
3a4f98bb 2210 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2211 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2212 " confirmed yet!\n");
2213 return nfserr_bad_stateid;
1da177e4 2214 }
0836f587
BF		 2215 status = check_stateid_generation(stateid, &stp->st_stateid);
2216 if (status)
2217 return status;
52fd004e 2218 renew_client(sop->so_client);
3a4f98bb 2219 return nfs_ok;
1da177e4 2220
1da177e4 2221check_replay:
bd9aac52 2222 if (seqid == sop->so_seqid - 1) {
849823c5 2223 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2224 /* indicate replay to calling function */
a90b061c 2225 return nfserr_replay_me;
1da177e4 2226 }
2fdada03 2227 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2228 sop->so_seqid, seqid);
2229 *sopp = NULL;
2230 return nfserr_bad_seqid;
1da177e4
LT		 2231}
2232
b37ad28b 2233__be32
ca364317 2234nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2235 struct nfsd4_open_confirm *oc)
1da177e4 2236{
b37ad28b 2237 __be32 status;
1da177e4
LT		 2238 struct nfs4_stateowner *sop;
2239 struct nfs4_stateid *stp;
2240
2241 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2242 (int)cstate->current_fh.fh_dentry->d_name.len,
2243 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2244
ca364317 2245 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2246 if (status)
2247 return status;
1da177e4
LT		 2248
2249 nfs4_lock_state();
2250
ca364317
BF		 2251 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2252 oc->oc_seqid, &oc->oc_req_stateid,
f3362737 2253 CONFIRM | OPEN_STATE,
1da177e4
LT		 2254 &oc->oc_stateowner, &stp, NULL)))
2255 goto out;
2256
2257 sop = oc->oc_stateowner;
2258 sop->so_confirmed = 1;
2259 update_stateid(&stp->st_stateid);
2260 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2261 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2262 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2263 stp->st_stateid.si_boot,
2264 stp->st_stateid.si_stateownerid,
2265 stp->st_stateid.si_fileid,
2266 stp->st_stateid.si_generation);
c7b9a459
N		 2267
2268 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2269out:
f2327d9a 2270 if (oc->oc_stateowner) {
1da177e4 2271 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2272 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2273 }
1da177e4
LT		 2274 nfs4_unlock_state();
2275 return status;
2276}
2277
2278
2279/*
2280 * unset all bits in union bitmap (bmap) that
2281 * do not exist in share (from successful OPEN_DOWNGRADE)
2282 */
2283static void
2284reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2285{
2286 int i;
2287 for (i = 1; i < 4; i++) {
2288 if ((i & access) != i)
2289 __clear_bit(i, bmap);
2290 }
2291}
2292
2293static void
2294reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2295{
2296 int i;
2297 for (i = 0; i < 4; i++) {
2298 if ((i & deny) != i)
2299 __clear_bit(i, bmap);
2300 }
2301}
2302
b37ad28b 2303__be32
ca364317
BF		 2304nfsd4_open_downgrade(struct svc_rqst *rqstp,
2305 struct nfsd4_compound_state *cstate,
a4f1706a 2306 struct nfsd4_open_downgrade *od)
1da177e4 2307{
b37ad28b 2308 __be32 status;
1da177e4
LT		 2309 struct nfs4_stateid *stp;
2310 unsigned int share_access;
2311
2312 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2313 (int)cstate->current_fh.fh_dentry->d_name.len,
2314 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2315
ba5a6a19
BF		 2316 if (!access_valid(od->od_share_access)
2317 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2318 return nfserr_inval;
2319
2320 nfs4_lock_state();
ca364317
BF		 2321 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2322 od->od_seqid,
1da177e4 2323 &od->od_stateid,
f3362737 2324 OPEN_STATE,
1da177e4
LT		 2325 &od->od_stateowner, &stp, NULL)))
2326 goto out;
2327
2328 status = nfserr_inval;
2329 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2330 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2331 stp->st_access_bmap, od->od_share_access);
2332 goto out;
2333 }
2334 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2335 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2336 stp->st_deny_bmap, od->od_share_deny);
2337 goto out;
2338 }
2339 set_access(&share_access, stp->st_access_bmap);
2340 nfs4_file_downgrade(stp->st_vfs_file,
2341 share_access & ~od->od_share_access);
2342
2343 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2344 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2345
2346 update_stateid(&stp->st_stateid);
2347 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2348 status = nfs_ok;
2349out:
f2327d9a 2350 if (od->od_stateowner) {
1da177e4 2351 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2352 cstate->replay_owner = od->od_stateowner;
f2327d9a 2353 }
1da177e4
LT		 2354 nfs4_unlock_state();
2355 return status;
2356}
2357
2358/*
2359 * nfs4_unlock_state() called after encode
2360 */
b37ad28b 2361__be32
ca364317 2362nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2363 struct nfsd4_close *close)
1da177e4 2364{
b37ad28b 2365 __be32 status;
1da177e4
LT		 2366 struct nfs4_stateid *stp;
2367
2368 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2369 (int)cstate->current_fh.fh_dentry->d_name.len,
2370 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2371
2372 nfs4_lock_state();
2373 /* check close_lru for replay */
ca364317
BF		 2374 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2375 close->cl_seqid,
1da177e4 2376 &close->cl_stateid,
f3362737 2377 OPEN_STATE | CLOSE_STATE,
1da177e4
LT		 2378 &close->cl_stateowner, &stp, NULL)))
2379 goto out;
1da177e4
LT		 2380 status = nfs_ok;
2381 update_stateid(&stp->st_stateid);
2382 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2383
04ef5954 2384 /* release_stateid() calls nfsd_close() if needed */
2283963f 2385 release_open_stateid(stp);
04ef5954
BF		 2386
2387 /* place unused nfs4_stateowners on so_close_lru list to be
2388 * released by the laundromat service after the lease period
2389 * to enable us to handle CLOSE replay
2390 */
2391 if (list_empty(&close->cl_stateowner->so_stateids))
2392 move_to_close_lru(close->cl_stateowner);
1da177e4 2393out:
f2327d9a 2394 if (close->cl_stateowner) {
1da177e4 2395 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2396 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2397 }
1da177e4
LT		 2398 nfs4_unlock_state();
2399 return status;
2400}
2401
b37ad28b 2402__be32
ca364317
BF		 2403nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2404 struct nfsd4_delegreturn *dr)
1da177e4 2405{
b37ad28b 2406 __be32 status;
1da177e4 2407
ca364317 2408 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2409 goto out;
2410
2411 nfs4_lock_state();
ca364317
BF		 2412 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2413 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2414 nfs4_unlock_state();
2415out:
2416 return status;
2417}
2418
2419
2420/*
2421 * Lock owner state (byte-range locks)
2422 */
2423#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2424#define LOCK_HASH_BITS 8
2425#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2426#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2427
87df4de8
BH		 2428static inline u64
2429end_offset(u64 start, u64 len)
2430{
2431 u64 end;
2432
2433 end = start + len;
2434 return end >= start ? end: NFS4_MAX_UINT64;
2435}
2436
2437/* last octet in a range */
2438static inline u64
2439last_byte_offset(u64 start, u64 len)
2440{
2441 u64 end;
2442
2443 BUG_ON(!len);
2444 end = start + len;
2445 return end > start ? end - 1: NFS4_MAX_UINT64;
2446}
2447
1da177e4
LT		 2448#define lockownerid_hashval(id) \
2449 ((id) & LOCK_HASH_MASK)
2450
2451static inline unsigned int
2452lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2453 struct xdr_netobj *ownername)
2454{
2455 return (file_hashval(inode) + cl_id
2456 + opaque_hashval(ownername->data, ownername->len))
2457 & LOCK_HASH_MASK;
2458}
2459
2460static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2461static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2462static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2463
fd39ca9a 2464static struct nfs4_stateid *
1da177e4
LT		 2465find_stateid(stateid_t *stid, int flags)
2466{
9346eff0 2467 struct nfs4_stateid *local;
1da177e4
LT		 2468 u32 st_id = stid->si_stateownerid;
2469 u32 f_id = stid->si_fileid;
2470 unsigned int hashval;
2471
2472 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
9346eff0 2473 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2474 hashval = stateid_hashval(st_id, f_id);
2475 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2476 if ((local->st_stateid.si_stateownerid == st_id) &&
2477 (local->st_stateid.si_fileid == f_id))
2478 return local;
2479 }
2480 }
9346eff0
KK		 2481
2482 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
1da177e4
LT		 2483 hashval = stateid_hashval(st_id, f_id);
2484 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2485 if ((local->st_stateid.si_stateownerid == st_id) &&
2486 (local->st_stateid.si_fileid == f_id))
2487 return local;
2488 }
849823c5 2489 }
1da177e4
LT		 2490 return NULL;
2491}
2492
2493static struct nfs4_delegation *
2494find_delegation_stateid(struct inode *ino, stateid_t *stid)
2495{
13cd2184
N		 2496 struct nfs4_file *fp;
2497 struct nfs4_delegation *dl;
1da177e4
LT		 2498
2499 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2500 stid->si_boot, stid->si_stateownerid,
2501 stid->si_fileid, stid->si_generation);
2502
1da177e4 2503 fp = find_file(ino);
13cd2184
N		 2504 if (!fp)
2505 return NULL;
2506 dl = find_delegation_file(fp, stid);
2507 put_nfs4_file(fp);
2508 return dl;
1da177e4
LT		 2509}
2510
2511/*
2512 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2513 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2514 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2515 * locking, this prevents us from being completely protocol-compliant. The
2516 * real solution to this problem is to start using unsigned file offsets in
2517 * the VFS, but this is a very deep change!
2518 */
2519static inline void
2520nfs4_transform_lock_offset(struct file_lock *lock)
2521{
2522 if (lock->fl_start < 0)
2523 lock->fl_start = OFFSET_MAX;
2524 if (lock->fl_end < 0)
2525 lock->fl_end = OFFSET_MAX;
2526}
2527
d5b9026a
N		 2528/* Hack!: For now, we're defining this just so we can use a pointer to it
2529 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2530static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2531};
1da177e4
LT		 2532
2533static inline void
2534nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2535{
d5b9026a
N		 2536 struct nfs4_stateowner *sop;
2537 unsigned int hval;
1da177e4 2538
d5b9026a
N		 2539 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2540 sop = (struct nfs4_stateowner *) fl->fl_owner;
2541 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2542 kref_get(&sop->so_ref);
2543 deny->ld_sop = sop;
2544 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2545 } else {
2546 deny->ld_sop = NULL;
2547 deny->ld_clientid.cl_boot = 0;
2548 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2549 }
2550 deny->ld_start = fl->fl_start;
87df4de8
BH		 2551 deny->ld_length = NFS4_MAX_UINT64;
2552 if (fl->fl_end != NFS4_MAX_UINT64)
1da177e4
LT		 2553 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2554 deny->ld_type = NFS4_READ_LT;
2555 if (fl->fl_type != F_RDLCK)
2556 deny->ld_type = NFS4_WRITE_LT;
2557}
2558
1da177e4
LT		 2559static struct nfs4_stateowner *
2560find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2561 struct xdr_netobj *owner)
2562{
2563 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2564 struct nfs4_stateowner *op;
2565
2566 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2567 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2568 return op;
2569 }
2570 return NULL;
2571}
2572
2573/*
2574 * Alloc a lock owner structure.
2575 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2576 * occured.
2577 *
2578 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2579 */
2580
2581static struct nfs4_stateowner *
2582alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2583 struct nfs4_stateowner *sop;
2584 struct nfs4_replay *rp;
2585 unsigned int idhashval;
2586
2587 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2588 return NULL;
2589 idhashval = lockownerid_hashval(current_ownerid);
2590 INIT_LIST_HEAD(&sop->so_idhash);
2591 INIT_LIST_HEAD(&sop->so_strhash);
2592 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2593 INIT_LIST_HEAD(&sop->so_stateids);
2594 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2595 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2596 sop->so_time = 0;
2597 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2598 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2599 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2600 sop->so_is_open_owner = 0;
2601 sop->so_id = current_ownerid++;
2602 sop->so_client = clp;
b59e3c0e
NB		 2603 /* It is the openowner seqid that will be incremented in encode in the
2604 * case of new lockowners; so increment the lock seqid manually: */
2605 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2606 sop->so_confirmed = 1;
2607 rp = &sop->so_replay;
de1ae286 2608 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2609 rp->rp_buflen = 0;
2610 rp->rp_buf = rp->rp_ibuf;
2611 return sop;
2612}
2613
fd39ca9a 2614static struct nfs4_stateid *
1da177e4
LT		 2615alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2616{
2617 struct nfs4_stateid *stp;
2618 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2619
5ac049ac
N		 2620 stp = nfs4_alloc_stateid();
2621 if (stp == NULL)
1da177e4
LT		 2622 goto out;
2623 INIT_LIST_HEAD(&stp->st_hash);
2624 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2625 INIT_LIST_HEAD(&stp->st_perstateowner);
2626 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2627 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2628 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2629 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2630 stp->st_stateowner = sop;
13cd2184 2631 get_nfs4_file(fp);
1da177e4
LT		 2632 stp->st_file = fp;
2633 stp->st_stateid.si_boot = boot_time;
2634 stp->st_stateid.si_stateownerid = sop->so_id;
2635 stp->st_stateid.si_fileid = fp->fi_id;
2636 stp->st_stateid.si_generation = 0;
2637 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2638 stp->st_access_bmap = open_stp->st_access_bmap;
2639 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2640 stp->st_openstp = open_stp;
1da177e4
LT		 2641
2642out:
2643 return stp;
2644}
2645
fd39ca9a 2646static int
1da177e4
LT		 2647check_lock_length(u64 offset, u64 length)
2648{
87df4de8 2649 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
1da177e4
LT		 2650 LOFF_OVERFLOW(offset, length)));
2651}
2652
2653/*
2654 * LOCK operation
2655 */
b37ad28b 2656__be32
ca364317 2657nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2658 struct nfsd4_lock *lock)
1da177e4 2659{
3e9e3dbe 2660 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2661 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2662 struct nfs4_stateid *lock_stp;
2663 struct file *filp;
2664 struct file_lock file_lock;
8dc7c311 2665 struct file_lock conflock;
b37ad28b 2666 __be32 status = 0;
1da177e4 2667 unsigned int strhashval;
150b3934 2668 unsigned int cmd;
b8dd7b9a 2669 int err;
1da177e4
LT		 2670
2671 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2672 (long long) lock->lk_offset,
2673 (long long) lock->lk_length);
2674
1da177e4
LT		 2675 if (check_lock_length(lock->lk_offset, lock->lk_length))
2676 return nfserr_inval;
2677
ca364317 2678 if ((status = fh_verify(rqstp, &cstate->current_fh,
8837abca 2679 S_IFREG, NFSD_MAY_LOCK))) {
a6f6ef2f
AA		 2680 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2681 return status;
2682 }
2683
1da177e4
LT		 2684 nfs4_lock_state();
2685
2686 if (lock->lk_is_new) {
893f8770
N		 2687 /*
2688 * Client indicates that this is a new lockowner.
2689 * Use open owner and open stateid to create lock owner and
2690 * lock stateid.
2691 */
1da177e4
LT		 2692 struct nfs4_stateid *open_stp = NULL;
2693 struct nfs4_file *fp;
2694
2695 status = nfserr_stale_clientid;
849823c5 2696 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2697 goto out;
1da177e4 2698
1da177e4 2699 /* validate and update open stateid and open seqid */
ca364317 2700 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2701 lock->lk_new_open_seqid,
2702 &lock->lk_new_open_stateid,
f3362737 2703 OPEN_STATE,
3a65588a 2704 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2705 lock);
37515177 2706 if (status)
1da177e4 2707 goto out;
3a65588a 2708 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2709 /* create lockowner and lock stateid */
2710 fp = open_stp->st_file;
2711 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2712 open_sop->so_client->cl_clientid.cl_id,
2713 &lock->v.new.owner);
3e9e3dbe
N		 2714 /* XXX: Do we need to check for duplicate stateowners on
2715 * the same file, or should they just be allowed (and
2716 * create new stateids)? */
1da177e4 2717 status = nfserr_resource;
b59e3c0e
NB		 2718 lock_sop = alloc_init_lock_stateowner(strhashval,
2719 open_sop->so_client, open_stp, lock);
2720 if (lock_sop == NULL)
1da177e4 2721 goto out;
b59e3c0e 2722 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2723 if (lock_stp == NULL)
1da177e4 2724 goto out;
1da177e4
LT		 2725 } else {
2726 /* lock (lock owner + lock stateid) already exists */
ca364317 2727 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2728 lock->lk_old_lock_seqid,
2729 &lock->lk_old_lock_stateid,
f3362737 2730 LOCK_STATE,
3a65588a 2731 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2732 if (status)
2733 goto out;
3a65588a 2734 lock_sop = lock->lk_replay_owner;
1da177e4 2735 }
3a65588a 2736 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2737 filp = lock_stp->st_vfs_file;
2738
0dd395dc 2739 status = nfserr_grace;
af558e33 2740 if (locks_in_grace() && !lock->lk_reclaim)
0dd395dc
N		 2741 goto out;
2742 status = nfserr_no_grace;
af558e33 2743 if (!locks_in_grace() && lock->lk_reclaim)
0dd395dc
N		 2744 goto out;
2745
1da177e4
LT		 2746 locks_init_lock(&file_lock);
2747 switch (lock->lk_type) {
2748 case NFS4_READ_LT:
2749 case NFS4_READW_LT:
2750 file_lock.fl_type = F_RDLCK;
150b3934 2751 cmd = F_SETLK;
1da177e4
LT		 2752 break;
2753 case NFS4_WRITE_LT:
2754 case NFS4_WRITEW_LT:
2755 file_lock.fl_type = F_WRLCK;
150b3934 2756 cmd = F_SETLK;
1da177e4
LT		 2757 break;
2758 default:
2759 status = nfserr_inval;
2760 goto out;
2761 }
b59e3c0e 2762 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2763 file_lock.fl_pid = current->tgid;
2764 file_lock.fl_file = filp;
2765 file_lock.fl_flags = FL_POSIX;
d5b9026a 2766 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2767
2768 file_lock.fl_start = lock->lk_offset;
87df4de8 2769 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
1da177e4
LT		 2770 nfs4_transform_lock_offset(&file_lock);
2771
2772 /*
2773 * Try to lock the file in the VFS.
2774 * Note: locks.c uses the BKL to protect the inode's lock list.
2775 */
2776
fd85b817 2777 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2778 switch (-err) {
1da177e4
LT		 2779 case 0: /* success! */
2780 update_stateid(&lock_stp->st_stateid);
2781 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2782 sizeof(stateid_t));
b8dd7b9a 2783 status = 0;
eb76b3fd
AA		 2784 break;
2785 case (EAGAIN): /* conflock holds conflicting lock */
2786 status = nfserr_denied;
2787 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2788 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2789 break;
1da177e4
LT		 2790 case (EDEADLK):
2791 status = nfserr_deadlock;
eb76b3fd 2792 break;
1da177e4 2793 default:
fd85b817 2794 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2795 status = nfserr_resource;
2796 break;
1da177e4 2797 }
1da177e4 2798out:
8a280510
BF		 2799 if (status && lock->lk_is_new && lock_sop)
2800 release_stateowner(lock_sop);
3a65588a
BF		 2801 if (lock->lk_replay_owner) {
2802 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2803 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2804 }
1da177e4
LT		 2805 nfs4_unlock_state();
2806 return status;
2807}
2808
55ef1274
BF		 2809/*
2810 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2811 * so we do a temporary open here just to get an open file to pass to
2812 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2813 * inode operation.)
2814 */
2815static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2816{
2817 struct file *file;
2818 int err;
2819
2820 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2821 if (err)
2822 return err;
2823 err = vfs_test_lock(file, lock);
2824 nfsd_close(file);
2825 return err;
2826}
2827
1da177e4
LT		 2828/*
2829 * LOCKT operation
2830 */
b37ad28b 2831__be32
ca364317
BF		 2832nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2833 struct nfsd4_lockt *lockt)
1da177e4
LT		 2834{
2835 struct inode *inode;
1da177e4 2836 struct file_lock file_lock;
fd85b817 2837 int error;
b37ad28b 2838 __be32 status;
1da177e4 2839
af558e33 2840 if (locks_in_grace())
1da177e4
LT		 2841 return nfserr_grace;
2842
2843 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2844 return nfserr_inval;
2845
2846 lockt->lt_stateowner = NULL;
2847 nfs4_lock_state();
2848
2849 status = nfserr_stale_clientid;
849823c5 2850 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2851 goto out;
1da177e4 2852
ca364317 2853 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2854 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2855 if (status == nfserr_symlink)
2856 status = nfserr_inval;
2857 goto out;
2858 }
2859
ca364317 2860 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2861 locks_init_lock(&file_lock);
2862 switch (lockt->lt_type) {
2863 case NFS4_READ_LT:
2864 case NFS4_READW_LT:
2865 file_lock.fl_type = F_RDLCK;
2866 break;
2867 case NFS4_WRITE_LT:
2868 case NFS4_WRITEW_LT:
2869 file_lock.fl_type = F_WRLCK;
2870 break;
2871 default:
2fdada03 2872 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2873 status = nfserr_inval;
2874 goto out;
2875 }
2876
2877 lockt->lt_stateowner = find_lockstateowner_str(inode,
2878 &lockt->lt_clientid, &lockt->lt_owner);
2879 if (lockt->lt_stateowner)
2880 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2881 file_lock.fl_pid = current->tgid;
2882 file_lock.fl_flags = FL_POSIX;
2883
2884 file_lock.fl_start = lockt->lt_offset;
87df4de8 2885 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
1da177e4
LT		 2886
2887 nfs4_transform_lock_offset(&file_lock);
2888
1da177e4 2889 status = nfs_ok;
55ef1274 2890 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
fd85b817
ME		 2891 if (error) {
2892 status = nfserrno(error);
2893 goto out;
2894 }
9d6a8c5c 2895 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2896 status = nfserr_denied;
9d6a8c5c 2897 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2898 }
2899out:
2900 nfs4_unlock_state();
2901 return status;
2902}
2903
b37ad28b 2904__be32
ca364317 2905nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2906 struct nfsd4_locku *locku)
1da177e4
LT		 2907{
2908 struct nfs4_stateid *stp;
2909 struct file *filp = NULL;
2910 struct file_lock file_lock;
b37ad28b 2911 __be32 status;
b8dd7b9a 2912 int err;
1da177e4
LT		 2913
2914 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2915 (long long) locku->lu_offset,
2916 (long long) locku->lu_length);
2917
2918 if (check_lock_length(locku->lu_offset, locku->lu_length))
2919 return nfserr_inval;
2920
2921 nfs4_lock_state();
2922
ca364317 2923 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2924 locku->lu_seqid,
2925 &locku->lu_stateid,
f3362737 2926 LOCK_STATE,
1da177e4
LT		 2927 &locku->lu_stateowner, &stp, NULL)))
2928 goto out;
2929
2930 filp = stp->st_vfs_file;
2931 BUG_ON(!filp);
2932 locks_init_lock(&file_lock);
2933 file_lock.fl_type = F_UNLCK;
2934 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2935 file_lock.fl_pid = current->tgid;
2936 file_lock.fl_file = filp;
2937 file_lock.fl_flags = FL_POSIX;
d5b9026a 2938 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2939 file_lock.fl_start = locku->lu_offset;
2940
87df4de8 2941 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
1da177e4
LT		 2942 nfs4_transform_lock_offset(&file_lock);
2943
2944 /*
2945 * Try to unlock the file in the VFS.
2946 */
fd85b817 2947 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2948 if (err) {
fd85b817 2949 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2950 goto out_nfserr;
2951 }
2952 /*
2953 * OK, unlock succeeded; the only thing left to do is update the stateid.
2954 */
2955 update_stateid(&stp->st_stateid);
2956 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2957
2958out:
f2327d9a 2959 if (locku->lu_stateowner) {
1da177e4 2960 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2961 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2962 }
1da177e4
LT		 2963 nfs4_unlock_state();
2964 return status;
2965
2966out_nfserr:
b8dd7b9a 2967 status = nfserrno(err);
1da177e4
LT		 2968 goto out;
2969}
2970
2971/*
2972 * returns
2973 * 1: locks held by lockowner
2974 * 0: no locks held by lockowner
2975 */
2976static int
2977check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2978{
2979 struct file_lock **flpp;
7eaa36e2 2980 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2981 int status = 0;
2982
2983 lock_kernel();
2984 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2985 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2986 status = 1;
2987 goto out;
796dadfd 2988 }
1da177e4
LT		 2989 }
2990out:
2991 unlock_kernel();
2992 return status;
2993}
2994
b37ad28b 2995__be32
b591480b
BF		 2996nfsd4_release_lockowner(struct svc_rqst *rqstp,
2997 struct nfsd4_compound_state *cstate,
2998 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2999{
3000 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3001 struct nfs4_stateowner *sop;
3002 struct nfs4_stateid *stp;
1da177e4 3003 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3004 struct list_head matches;
3005 int i;
b37ad28b 3006 __be32 status;
1da177e4
LT		 3007
3008 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3009 clid->cl_boot, clid->cl_id);
3010
3011 /* XXX check for lease expiration */
3012
3013 status = nfserr_stale_clientid;
849823c5 3014 if (STALE_CLIENTID(clid))
1da177e4 3015 return status;
1da177e4
LT		 3016
3017 nfs4_lock_state();
3018
3e9e3dbe
N		 3019 status = nfserr_locks_held;
3020 /* XXX: we're doing a linear search through all the lockowners.
3021 * Yipes! For now we'll just hope clients aren't really using
3022 * release_lockowner much, but eventually we have to fix these
3023 * data structures. */
3024 INIT_LIST_HEAD(&matches);
3025 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3026 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3027 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3028 continue;
3029 list_for_each_entry(stp, &sop->so_stateids,
3030 st_perstateowner) {
3031 if (check_for_locks(stp->st_vfs_file, sop))
3032 goto out;
3033 /* Note: so_perclient unused for lockowners,
3034 * so it's OK to fool with here. */
3035 list_add(&sop->so_perclient, &matches);
3036 }
1da177e4 3037 }
3e9e3dbe
N		 3038 }
3039 /* Clients probably won't expect us to return with some (but not all)
3040 * of the lockowner state released; so don't release any until all
3041 * have been checked. */
3042 status = nfs_ok;
0fa822e4
N		 3043 while (!list_empty(&matches)) {
3044 sop = list_entry(matches.next, struct nfs4_stateowner,
3045 so_perclient);
3046 /* unhash_stateowner deletes so_perclient only
3047 * for openowners. */
3048 list_del(&sop->so_perclient);
3e9e3dbe 3049 release_stateowner(sop);
1da177e4
LT		 3050 }
3051out:
3052 nfs4_unlock_state();
3053 return status;
3054}
3055
3056static inline struct nfs4_client_reclaim *
a55370a3 3057alloc_reclaim(void)
1da177e4 3058{
a55370a3 3059 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3060}
3061
c7b9a459
N		 3062int
3063nfs4_has_reclaimed_state(const char *name)
3064{
3065 unsigned int strhashval = clientstr_hashval(name);
3066 struct nfs4_client *clp;
3067
3068 clp = find_confirmed_client_by_str(name, strhashval);
3069 return clp ? 1 : 0;
3070}
3071
1da177e4
LT		 3072/*
3073 * failure => all reset bets are off, nfserr_no_grace...
3074 */
190e4fbf
N		 3075int
3076nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3077{
3078 unsigned int strhashval;
3079 struct nfs4_client_reclaim *crp = NULL;
3080
a55370a3
N		 3081 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3082 crp = alloc_reclaim();
1da177e4
LT		 3083 if (!crp)
3084 return 0;
a55370a3 3085 strhashval = clientstr_hashval(name);
1da177e4
LT		 3086 INIT_LIST_HEAD(&crp->cr_strhash);
3087 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3088 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3089 reclaim_str_hashtbl_size++;
3090 return 1;
3091}
3092
3093static void
3094nfs4_release_reclaim(void)
3095{
3096 struct nfs4_client_reclaim *crp = NULL;
3097 int i;
3098
1da177e4
LT		 3099 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3100 while (!list_empty(&reclaim_str_hashtbl[i])) {
3101 crp = list_entry(reclaim_str_hashtbl[i].next,
3102 struct nfs4_client_reclaim, cr_strhash);
3103 list_del(&crp->cr_strhash);
1da177e4
LT		 3104 kfree(crp);
3105 reclaim_str_hashtbl_size--;
3106 }
3107 }
3108 BUG_ON(reclaim_str_hashtbl_size);
3109}
3110
3111/*
3112 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3113static struct nfs4_client_reclaim *
1da177e4
LT		 3114nfs4_find_reclaim_client(clientid_t *clid)
3115{
3116 unsigned int strhashval;
3117 struct nfs4_client *clp;
3118 struct nfs4_client_reclaim *crp = NULL;
3119
3120
3121 /* find clientid in conf_id_hashtbl */
3122 clp = find_confirmed_client(clid);
3123 if (clp == NULL)
3124 return NULL;
3125
a55370a3
N		 3126 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3127 clp->cl_name.len, clp->cl_name.data,
3128 clp->cl_recdir);
1da177e4
LT		 3129
3130 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3131 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3132 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3133 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3134 return crp;
3135 }
3136 }
3137 return NULL;
3138}
3139
3140/*
3141* Called from OPEN. Look for clientid in reclaim list.
3142*/
b37ad28b 3143__be32
1da177e4
LT		 3144nfs4_check_open_reclaim(clientid_t *clid)
3145{
dfc83565 3146 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3147}
3148
ac4d8ff2 3149/* initialization to perform at module load time: */
1da177e4 3150
e8ff2a84 3151int
ac4d8ff2 3152nfs4_state_init(void)
1da177e4 3153{
e8ff2a84 3154 int i, status;
1da177e4 3155
e8ff2a84
BF		 3156 status = nfsd4_init_slabs();
3157 if (status)
3158 return status;
1da177e4
LT		 3159 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3160 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3161 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3162 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3163 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3164 }
3165 for (i = 0; i < FILE_HASH_SIZE; i++) {
3166 INIT_LIST_HEAD(&file_hashtbl[i]);
3167 }
3168 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3169 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3170 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3171 }
3172 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3173 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3174 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3175 }
3176 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3177 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3178 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3179 }
1da177e4 3180 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3181 INIT_LIST_HEAD(&close_lru);
3182 INIT_LIST_HEAD(&client_lru);
3183 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3184 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3185 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3186 reclaim_str_hashtbl_size = 0;
e8ff2a84 3187 return 0;
ac4d8ff2
N		 3188}
3189
190e4fbf
N		 3190static void
3191nfsd4_load_reboot_recovery_data(void)
3192{
3193 int status;
3194
0964a3d3
N		 3195 nfs4_lock_state();
3196 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3197 status = nfsd4_recdir_load();
0964a3d3 3198 nfs4_unlock_state();
190e4fbf
N		 3199 if (status)
3200 printk("NFSD: Failure reading reboot recovery data\n");
3201}
3202
9a8db97e
ME		 3203unsigned long
3204get_nfs4_grace_period(void)
3205{
3206 return max(user_lease_time, lease_time) * HZ;
3207}
3208
c2f1a551
MS		 3209/*
3210 * Since the lifetime of a delegation isn't limited to that of an open, a
3211 * client may quite reasonably hang on to a delegation as long as it has
3212 * the inode cached. This becomes an obvious problem the first time a
3213 * client's inode cache approaches the size of the server's total memory.
3214 *
3215 * For now we avoid this problem by imposing a hard limit on the number
3216 * of delegations, which varies according to the server's memory size.
3217 */
3218static void
3219set_max_delegations(void)
3220{
3221 /*
3222 * Allow at most 4 delegations per megabyte of RAM. Quick
3223 * estimates suggest that in the worst case (where every delegation
3224 * is for a different inode), a delegation could take about 1.5K,
3225 * giving a worst case usage of about 6% of memory.
3226 */
3227 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3228}
3229
ac4d8ff2
N		 3230/* initialization to perform when the nfsd service is started: */
3231
3232static void
3233__nfs4_state_start(void)
3234{
9a8db97e 3235 unsigned long grace_time;
ac4d8ff2 3236
1da177e4 3237 boot_time = get_seconds();
af558e33 3238 grace_time = get_nfs4_grace_period();
d99a05ad 3239 lease_time = user_lease_time;
af558e33 3240 locks_start_grace(&nfsd4_manager);
9a8db97e
ME		 3241 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3242 grace_time/HZ);
58da282b 3243 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3244 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3245 set_max_delegations();
1da177e4
LT		 3246}
3247
e8ff2a84 3248void
76a3550e 3249nfs4_state_start(void)
1da177e4 3250{
1da177e4 3251 if (nfs4_init)
e8ff2a84 3252 return;
190e4fbf 3253 nfsd4_load_reboot_recovery_data();
76a3550e 3254 __nfs4_state_start();
1da177e4 3255 nfs4_init = 1;
e8ff2a84 3256 return;
1da177e4
LT		 3257}
3258
1da177e4
LT		 3259time_t
3260nfs4_lease_time(void)
3261{
3262 return lease_time;
3263}
3264
3265static void
3266__nfs4_state_shutdown(void)
3267{
3268 int i;
3269 struct nfs4_client *clp = NULL;
3270 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3271 struct list_head *pos, *next, reaplist;
3272
1da177e4
LT		 3273 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3274 while (!list_empty(&conf_id_hashtbl[i])) {
3275 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3276 expire_client(clp);
3277 }
3278 while (!list_empty(&unconf_str_hashtbl[i])) {
3279 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3280 expire_client(clp);
3281 }
3282 }
3283 INIT_LIST_HEAD(&reaplist);
3284 spin_lock(&recall_lock);
3285 list_for_each_safe(pos, next, &del_recall_lru) {
3286 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3287 list_move(&dp->dl_recall_lru, &reaplist);
3288 }
3289 spin_unlock(&recall_lock);
3290 list_for_each_safe(pos, next, &reaplist) {
3291 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3292 list_del_init(&dp->dl_recall_lru);
3293 unhash_delegation(dp);
3294 }
3295
190e4fbf 3296 nfsd4_shutdown_recdir();
1da177e4 3297 nfs4_init = 0;
1da177e4
LT		 3298}
3299
3300void
3301nfs4_state_shutdown(void)
3302{
5e8d5c29
N		 3303 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3304 destroy_workqueue(laundry_wq);
2c5e7615 3305 locks_end_grace(&nfsd4_manager);
1da177e4
LT		 3306 nfs4_lock_state();
3307 nfs4_release_reclaim();
3308 __nfs4_state_shutdown();
1da177e4
LT		 3309 nfs4_unlock_state();
3310}
3311
3dd98a3b
JL		 3312/*
3313 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3314 * accessed when nfsd is starting.
3315 */
0964a3d3
N		 3316static void
3317nfs4_set_recdir(char *recdir)
3318{
0964a3d3 3319 strcpy(user_recovery_dirname, recdir);
0964a3d3
N		 3320}
3321
3322/*
3323 * Change the NFSv4 recovery directory to recdir.
3324 */
3325int
3326nfs4_reset_recoverydir(char *recdir)
3327{
3328 int status;
a63bb996 3329 struct path path;
0964a3d3 3330
a63bb996 3331 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
0964a3d3
N		 3332 if (status)
3333 return status;
3334 status = -ENOTDIR;
a63bb996 3335 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3336 nfs4_set_recdir(recdir);
3337 status = 0;
3338 }
a63bb996 3339 path_put(&path);
0964a3d3
N		 3340 return status;
3341}
3342
3dd98a3b
JL		 3343char *
3344nfs4_recoverydir(void)
3345{
3346 return user_recovery_dirname;
3347}
3348
1da177e4
LT		 3349/*
3350 * Called when leasetime is changed.
3351 *
d99a05ad
N		 3352 * The only way the protocol gives us to handle on-the-fly lease changes is to
3353 * simulate a reboot. Instead of doing that, we just wait till the next time
3354 * we start to register any changes in lease time. If the administrator
3355 * really wants to change the lease time *now*, they can go ahead and bring
3356 * nfsd down and then back up again after changing the lease time.
3dd98a3b
JL		 3357 *
3358 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3359 * when nfsd is starting
1da177e4
LT		 3360 */
3361void
3362nfs4_reset_lease(time_t leasetime)
3363{
d99a05ad 3364 user_lease_time = leasetime;
1da177e4 3365}
Linux kernel - Deliverables
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