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knfsd: cleanup of nfsd4 cmp_* functions
[net-next-2.6.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>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
c2f1a551 52#include <linux/swap.h>
353ab6e9 53#include <linux/mutex.h>
fd85b817 54#include <linux/lockd/bind.h>
9a8db97e 55#include <linux/module.h>
1da177e4
LT		 56
57#define NFSDDBG_FACILITY NFSDDBG_PROC
58
59/* Globals */
60static time_t lease_time = 90; /* default lease time */
d99a05ad 61static time_t user_lease_time = 90;
fd39ca9a 62static time_t boot_time;
a76b4319 63static int in_grace = 1;
1da177e4
LT		 64static u32 current_clientid = 1;
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);
122static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 123
124/*
125 * Delegation state
126 */
127
128/* recall_lock protects the del_recall_lru */
34af946a 129static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 130static struct list_head del_recall_lru;
131
13cd2184
N		 132static void
133free_nfs4_file(struct kref *kref)
134{
135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
136 list_del(&fp->fi_hash);
137 iput(fp->fi_inode);
138 kmem_cache_free(file_slab, fp);
139}
140
141static inline void
142put_nfs4_file(struct nfs4_file *fi)
143{
144 kref_put(&fi->fi_ref, free_nfs4_file);
145}
146
147static inline void
148get_nfs4_file(struct nfs4_file *fi)
149{
150 kref_get(&fi->fi_ref);
151}
152
ef0f3390 153static int num_delegations;
c2f1a551 154unsigned int max_delegations;
ef0f3390
N		 155
156/*
157 * Open owner state (share locks)
158 */
159
160/* hash tables for nfs4_stateowner */
161#define OWNER_HASH_BITS 8
162#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
163#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
164
165#define ownerid_hashval(id) \
166 ((id) & OWNER_HASH_MASK)
167#define ownerstr_hashval(clientid, ownername) \
168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
169
170static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
171static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
172
173/* hash table for nfs4_file */
174#define FILE_HASH_BITS 8
175#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
176#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
177/* hash table for (open)nfs4_stateid */
178#define STATEID_HASH_BITS 10
179#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
180#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
181
182#define file_hashval(x) \
183 hash_ptr(x, FILE_HASH_BITS)
184#define stateid_hashval(owner_id, file_id) \
185 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
186
187static struct list_head file_hashtbl[FILE_HASH_SIZE];
188static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
189
1da177e4
LT		 190static struct nfs4_delegation *
191alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
192{
193 struct nfs4_delegation *dp;
194 struct nfs4_file *fp = stp->st_file;
195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
196
197 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 198 if (fp->fi_had_conflict)
199 return NULL;
c2f1a551 200 if (num_delegations > max_delegations)
ef0f3390 201 return NULL;
5b2d21c1
N		 202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
203 if (dp == NULL)
1da177e4 204 return dp;
ef0f3390 205 num_delegations++;
ea1da636
N		 206 INIT_LIST_HEAD(&dp->dl_perfile);
207 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 208 INIT_LIST_HEAD(&dp->dl_recall_lru);
209 dp->dl_client = clp;
13cd2184 210 get_nfs4_file(fp);
1da177e4
LT		 211 dp->dl_file = fp;
212 dp->dl_flock = NULL;
213 get_file(stp->st_vfs_file);
214 dp->dl_vfs_file = stp->st_vfs_file;
215 dp->dl_type = type;
216 dp->dl_recall.cbr_dp = NULL;
217 dp->dl_recall.cbr_ident = cb->cb_ident;
218 dp->dl_recall.cbr_trunc = 0;
219 dp->dl_stateid.si_boot = boot_time;
220 dp->dl_stateid.si_stateownerid = current_delegid++;
221 dp->dl_stateid.si_fileid = 0;
222 dp->dl_stateid.si_generation = 0;
223 dp->dl_fhlen = current_fh->fh_handle.fh_size;
224 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
225 current_fh->fh_handle.fh_size);
226 dp->dl_time = 0;
227 atomic_set(&dp->dl_count, 1);
ea1da636
N		 228 list_add(&dp->dl_perfile, &fp->fi_delegations);
229 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 230 return dp;
231}
232
233void
234nfs4_put_delegation(struct nfs4_delegation *dp)
235{
236 if (atomic_dec_and_test(&dp->dl_count)) {
237 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 238 put_nfs4_file(dp->dl_file);
5b2d21c1 239 kmem_cache_free(deleg_slab, dp);
ef0f3390 240 num_delegations--;
1da177e4
LT		 241 }
242}
243
244/* Remove the associated file_lock first, then remove the delegation.
245 * lease_modify() is called to remove the FS_LEASE file_lock from
246 * the i_flock list, eventually calling nfsd's lock_manager
247 * fl_release_callback.
248 */
249static void
250nfs4_close_delegation(struct nfs4_delegation *dp)
251{
252 struct file *filp = dp->dl_vfs_file;
253
254 dprintk("NFSD: close_delegation dp %p\n",dp);
255 dp->dl_vfs_file = NULL;
256 /* The following nfsd_close may not actually close the file,
257 * but we want to remove the lease in any case. */
c907132d 258 if (dp->dl_flock)
a9933cea 259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 260 nfsd_close(filp);
1da177e4
LT		 261}
262
263/* Called under the state lock. */
264static void
265unhash_delegation(struct nfs4_delegation *dp)
266{
ea1da636
N		 267 list_del_init(&dp->dl_perfile);
268 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 269 spin_lock(&recall_lock);
270 list_del_init(&dp->dl_recall_lru);
271 spin_unlock(&recall_lock);
272 nfs4_close_delegation(dp);
273 nfs4_put_delegation(dp);
274}
275
276/*
277 * SETCLIENTID state
278 */
279
280/* Hash tables for nfs4_clientid state */
281#define CLIENT_HASH_BITS 4
282#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
283#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
284
285#define clientid_hashval(id) \
286 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 287#define clientstr_hashval(name) \
288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 289/*
290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
291 * used in reboot/reset lease grace period processing
292 *
293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
294 * setclientid_confirmed info.
295 *
296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
297 * setclientid info.
298 *
299 * client_lru holds client queue ordered by nfs4_client.cl_time
300 * for lease renewal.
301 *
302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
303 * for last close replay.
304 */
305static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
306static int reclaim_str_hashtbl_size = 0;
307static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
311static struct list_head client_lru;
312static struct list_head close_lru;
313
314static inline void
315renew_client(struct nfs4_client *clp)
316{
317 /*
318 * Move client to the end to the LRU list.
319 */
320 dprintk("renewing client (clientid %08x/%08x)\n",
321 clp->cl_clientid.cl_boot,
322 clp->cl_clientid.cl_id);
323 list_move_tail(&clp->cl_lru, &client_lru);
324 clp->cl_time = get_seconds();
325}
326
327/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
328static int
329STALE_CLIENTID(clientid_t *clid)
330{
331 if (clid->cl_boot == boot_time)
332 return 0;
333 dprintk("NFSD stale clientid (%08x/%08x)\n",
334 clid->cl_boot, clid->cl_id);
335 return 1;
336}
337
338/*
339 * XXX Should we use a slab cache ?
340 * This type of memory management is somewhat inefficient, but we use it
341 * anyway since SETCLIENTID is not a common operation.
342 */
343static inline struct nfs4_client *
344alloc_client(struct xdr_netobj name)
345{
346 struct nfs4_client *clp;
347
f8314dc6 348 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
1da177e4
LT		 349 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
350 memcpy(clp->cl_name.data, name.data, name.len);
351 clp->cl_name.len = name.len;
352 }
353 else {
354 kfree(clp);
355 clp = NULL;
356 }
357 }
358 return clp;
359}
360
361static inline void
362free_client(struct nfs4_client *clp)
363{
364 if (clp->cl_cred.cr_group_info)
365 put_group_info(clp->cl_cred.cr_group_info);
366 kfree(clp->cl_name.data);
367 kfree(clp);
368}
369
370void
371put_nfs4_client(struct nfs4_client *clp)
372{
373 if (atomic_dec_and_test(&clp->cl_count))
374 free_client(clp);
375}
376
4e2fd495
N		 377static void
378shutdown_callback_client(struct nfs4_client *clp)
379{
380 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
381
382 /* shutdown rpc client, ending any outstanding recall rpcs */
383 if (clnt) {
384 clp->cl_callback.cb_client = NULL;
385 rpc_shutdown_client(clnt);
4e2fd495
N		 386 }
387}
388
1da177e4
LT		 389static void
390expire_client(struct nfs4_client *clp)
391{
392 struct nfs4_stateowner *sop;
393 struct nfs4_delegation *dp;
1da177e4
LT		 394 struct list_head reaplist;
395
396 dprintk("NFSD: expire_client cl_count %d\n",
397 atomic_read(&clp->cl_count));
398
4e2fd495 399 shutdown_callback_client(clp);
1da177e4
LT		 400
401 INIT_LIST_HEAD(&reaplist);
402 spin_lock(&recall_lock);
ea1da636
N		 403 while (!list_empty(&clp->cl_delegations)) {
404 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 405 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
406 dp->dl_flock);
ea1da636 407 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 408 list_move(&dp->dl_recall_lru, &reaplist);
409 }
410 spin_unlock(&recall_lock);
411 while (!list_empty(&reaplist)) {
412 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
413 list_del_init(&dp->dl_recall_lru);
414 unhash_delegation(dp);
415 }
416 list_del(&clp->cl_idhash);
417 list_del(&clp->cl_strhash);
418 list_del(&clp->cl_lru);
ea1da636
N		 419 while (!list_empty(&clp->cl_openowners)) {
420 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 421 release_stateowner(sop);
422 }
423 put_nfs4_client(clp);
424}
425
426static struct nfs4_client *
a55370a3 427create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 428 struct nfs4_client *clp;
429
430 if (!(clp = alloc_client(name)))
431 goto out;
a55370a3 432 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 433 atomic_set(&clp->cl_count, 1);
434 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 435 INIT_LIST_HEAD(&clp->cl_idhash);
436 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 437 INIT_LIST_HEAD(&clp->cl_openowners);
438 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 439 INIT_LIST_HEAD(&clp->cl_lru);
440out:
441 return clp;
442}
443
444static void
445copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
446 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
447}
448
449static void
450copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
451 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
452 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
453}
454
455static void
456copy_cred(struct svc_cred *target, struct svc_cred *source) {
457
458 target->cr_uid = source->cr_uid;
459 target->cr_gid = source->cr_gid;
460 target->cr_group_info = source->cr_group_info;
461 get_group_info(target->cr_group_info);
462}
463
a55370a3 464static inline int
599e0a22
BF		 465same_name(const char *n1, const char *n2)
466{
a55370a3 467 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 468}
469
470static int
599e0a22
BF		 471same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
472{
473 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 474}
475
476static int
599e0a22
BF		 477same_clid(clientid_t *cl1, clientid_t *cl2)
478{
479 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 480}
481
482/* XXX what about NGROUP */
483static int
599e0a22
BF		 484same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
485{
486 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 487}
488
489static void
490gen_clid(struct nfs4_client *clp) {
491 clp->cl_clientid.cl_boot = boot_time;
492 clp->cl_clientid.cl_id = current_clientid++;
493}
494
495static void
496gen_confirm(struct nfs4_client *clp) {
497 struct timespec tv;
498 u32 * p;
499
500 tv = CURRENT_TIME;
501 p = (u32 *)clp->cl_confirm.data;
502 *p++ = tv.tv_sec;
503 *p++ = tv.tv_nsec;
504}
505
506static int
507check_name(struct xdr_netobj name) {
508
509 if (name.len == 0)
510 return 0;
511 if (name.len > NFS4_OPAQUE_LIMIT) {
512 printk("NFSD: check_name: name too long(%d)!\n", name.len);
513 return 0;
514 }
515 return 1;
516}
517
fd39ca9a 518static void
1da177e4
LT		 519add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
520{
521 unsigned int idhashval;
522
523 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
524 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
525 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
526 list_add_tail(&clp->cl_lru, &client_lru);
527 clp->cl_time = get_seconds();
528}
529
fd39ca9a 530static void
1da177e4
LT		 531move_to_confirmed(struct nfs4_client *clp)
532{
533 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
534 unsigned int strhashval;
535
536 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
537 list_del_init(&clp->cl_strhash);
f116629d 538 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 539 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 540 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
541 renew_client(clp);
542}
543
544static struct nfs4_client *
545find_confirmed_client(clientid_t *clid)
546{
547 struct nfs4_client *clp;
548 unsigned int idhashval = clientid_hashval(clid->cl_id);
549
550 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 551 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 552 return clp;
553 }
554 return NULL;
555}
556
557static struct nfs4_client *
558find_unconfirmed_client(clientid_t *clid)
559{
560 struct nfs4_client *clp;
561 unsigned int idhashval = clientid_hashval(clid->cl_id);
562
563 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 564 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 565 return clp;
566 }
567 return NULL;
568}
569
28ce6054
N		 570static struct nfs4_client *
571find_confirmed_client_by_str(const char *dname, unsigned int hashval)
572{
573 struct nfs4_client *clp;
574
575 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
576 if (same_name(clp->cl_recdir, dname))
577 return clp;
578 }
579 return NULL;
580}
581
582static struct nfs4_client *
583find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
584{
585 struct nfs4_client *clp;
586
587 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
588 if (same_name(clp->cl_recdir, dname))
589 return clp;
590 }
591 return NULL;
592}
593
1da177e4
LT		 594/* a helper function for parse_callback */
595static int
596parse_octet(unsigned int *lenp, char **addrp)
597{
598 unsigned int len = *lenp;
599 char *p = *addrp;
600 int n = -1;
601 char c;
602
603 for (;;) {
604 if (!len)
605 break;
606 len--;
607 c = *p++;
608 if (c == '.')
609 break;
610 if ((c < '0') || (c > '9')) {
611 n = -1;
612 break;
613 }
614 if (n < 0)
615 n = 0;
616 n = (n * 10) + (c - '0');
617 if (n > 255) {
618 n = -1;
619 break;
620 }
621 }
622 *lenp = len;
623 *addrp = p;
624 return n;
625}
626
627/* parse and set the setclientid ipv4 callback address */
fd39ca9a 628static int
1da177e4
LT		 629parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
630{
631 int temp = 0;
632 u32 cbaddr = 0;
633 u16 cbport = 0;
634 u32 addrlen = addr_len;
635 char *addr = addr_val;
636 int i, shift;
637
638 /* ipaddress */
639 shift = 24;
640 for(i = 4; i > 0 ; i--) {
641 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
642 return 0;
643 }
644 cbaddr |= (temp << shift);
645 if (shift > 0)
646 shift -= 8;
647 }
648 *cbaddrp = cbaddr;
649
650 /* port */
651 shift = 8;
652 for(i = 2; i > 0 ; i--) {
653 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
654 return 0;
655 }
656 cbport |= (temp << shift);
657 if (shift > 0)
658 shift -= 8;
659 }
660 *cbportp = cbport;
661 return 1;
662}
663
fd39ca9a 664static void
1da177e4
LT		 665gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
666{
667 struct nfs4_callback *cb = &clp->cl_callback;
668
669 /* Currently, we only support tcp for the callback channel */
670 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
671 goto out_err;
672
673 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
674 &cb->cb_addr, &cb->cb_port)))
675 goto out_err;
676 cb->cb_prog = se->se_callback_prog;
677 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 678 return;
679out_err:
849823c5 680 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 681 "will not receive delegations\n",
682 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
683
1da177e4
LT		 684 return;
685}
686
687/*
688 * RFC 3010 has a complex implmentation description of processing a
689 * SETCLIENTID request consisting of 5 bullets, labeled as
690 * CASE0 - CASE4 below.
691 *
692 * NOTES:
693 * callback information will be processed in a future patch
694 *
695 * an unconfirmed record is added when:
696 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
697 * CASE 1: confirmed record found with matching name, principal,
698 * verifier, and clientid.
699 * CASE 2: confirmed record found with matching name, principal,
700 * and there is no unconfirmed record with matching
701 * name and principal
702 *
703 * an unconfirmed record is replaced when:
704 * CASE 3: confirmed record found with matching name, principal,
705 * and an unconfirmed record is found with matching
706 * name, principal, and with clientid and
707 * confirm that does not match the confirmed record.
708 * CASE 4: there is no confirmed record with matching name and
709 * principal. there is an unconfirmed record with
710 * matching name, principal.
711 *
712 * an unconfirmed record is deleted when:
713 * CASE 1: an unconfirmed record that matches input name, verifier,
714 * and confirmed clientid.
715 * CASE 4: any unconfirmed records with matching name and principal
716 * that exist after an unconfirmed record has been replaced
717 * as described above.
718 *
719 */
b37ad28b 720__be32
b591480b
BF		 721nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
722 struct nfsd4_setclientid *setclid)
1da177e4 723{
27459f09 724 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 725 struct xdr_netobj clname = {
726 .len = setclid->se_namelen,
727 .data = setclid->se_name,
728 };
729 nfs4_verifier clverifier = setclid->se_verf;
730 unsigned int strhashval;
28ce6054 731 struct nfs4_client *conf, *unconf, *new;
b37ad28b 732 __be32 status;
a55370a3 733 char dname[HEXDIR_LEN];
1da177e4 734
1da177e4 735 if (!check_name(clname))
73aea4ec 736 return nfserr_inval;
1da177e4 737
a55370a3
N		 738 status = nfs4_make_rec_clidname(dname, &clname);
739 if (status)
73aea4ec 740 return status;
a55370a3 741
1da177e4
LT		 742 /*
743 * XXX The Duplicate Request Cache (DRC) has been checked (??)
744 * We get here on a DRC miss.
745 */
746
a55370a3 747 strhashval = clientstr_hashval(dname);
1da177e4 748
1da177e4 749 nfs4_lock_state();
28ce6054
N		 750 conf = find_confirmed_client_by_str(dname, strhashval);
751 if (conf) {
1da177e4
LT		 752 /*
753 * CASE 0:
754 * clname match, confirmed, different principal
755 * or different ip_address
756 */
757 status = nfserr_clid_inuse;
599e0a22 758 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 759 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 760 dprintk("NFSD: setclientid: string in use by client"
761 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 762 goto out;
763 }
1da177e4 764 }
28ce6054 765 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 766 status = nfserr_resource;
767 if (!conf) {
768 /*
769 * CASE 4:
770 * placed first, because it is the normal case.
771 */
772 if (unconf)
773 expire_client(unconf);
a55370a3
N		 774 new = create_client(clname, dname);
775 if (new == NULL)
1da177e4
LT		 776 goto out;
777 copy_verf(new, &clverifier);
27459f09 778 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 779 copy_cred(&new->cl_cred,&rqstp->rq_cred);
780 gen_clid(new);
781 gen_confirm(new);
782 gen_callback(new, setclid);
783 add_to_unconfirmed(new, strhashval);
599e0a22 784 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4
LT		 785 /*
786 * CASE 1:
787 * cl_name match, confirmed, principal match
788 * verifier match: probable callback update
789 *
790 * remove any unconfirmed nfs4_client with
791 * matching cl_name, cl_verifier, and cl_clientid
792 *
793 * create and insert an unconfirmed nfs4_client with same
794 * cl_name, cl_verifier, and cl_clientid as existing
795 * nfs4_client, but with the new callback info and a
796 * new cl_confirm
797 */
31f4a6c1
N		 798 if (unconf) {
799 /* Note this is removing unconfirmed {*x***},
800 * which is stronger than RFC recommended {vxc**}.
801 * This has the advantage that there is at most
802 * one {*x***} in either list at any time.
803 */
804 expire_client(unconf);
1da177e4 805 }
a55370a3
N		 806 new = create_client(clname, dname);
807 if (new == NULL)
1da177e4
LT		 808 goto out;
809 copy_verf(new,&conf->cl_verifier);
27459f09 810 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 811 copy_cred(&new->cl_cred,&rqstp->rq_cred);
812 copy_clid(new, conf);
813 gen_confirm(new);
814 gen_callback(new, setclid);
815 add_to_unconfirmed(new,strhashval);
816 } else if (!unconf) {
817 /*
818 * CASE 2:
819 * clname match, confirmed, principal match
820 * verfier does not match
821 * no unconfirmed. create a new unconfirmed nfs4_client
822 * using input clverifier, clname, and callback info
823 * and generate a new cl_clientid and cl_confirm.
824 */
a55370a3
N		 825 new = create_client(clname, dname);
826 if (new == NULL)
1da177e4
LT		 827 goto out;
828 copy_verf(new,&clverifier);
27459f09 829 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 830 copy_cred(&new->cl_cred,&rqstp->rq_cred);
831 gen_clid(new);
832 gen_confirm(new);
833 gen_callback(new, setclid);
834 add_to_unconfirmed(new, strhashval);
599e0a22 835 } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
1da177e4
LT		 836 /*
837 * CASE3:
838 * confirmed found (name, principal match)
839 * confirmed verifier does not match input clverifier
840 *
841 * unconfirmed found (name match)
842 * confirmed->cl_confirm != unconfirmed->cl_confirm
843 *
844 * remove unconfirmed.
845 *
846 * create an unconfirmed nfs4_client
847 * with same cl_name as existing confirmed nfs4_client,
848 * but with new callback info, new cl_clientid,
849 * new cl_verifier and a new cl_confirm
850 */
851 expire_client(unconf);
a55370a3
N		 852 new = create_client(clname, dname);
853 if (new == NULL)
1da177e4
LT		 854 goto out;
855 copy_verf(new,&clverifier);
27459f09 856 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 857 copy_cred(&new->cl_cred,&rqstp->rq_cred);
858 gen_clid(new);
859 gen_confirm(new);
860 gen_callback(new, setclid);
861 add_to_unconfirmed(new, strhashval);
862 } else {
863 /* No cases hit !!! */
864 status = nfserr_inval;
865 goto out;
866
867 }
868 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
869 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
870 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
871 status = nfs_ok;
872out:
873 nfs4_unlock_state();
874 return status;
875}
876
877
878/*
879 * RFC 3010 has a complex implmentation description of processing a
880 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
881 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
882 *
883 * NOTE: callback information will be processed here in a future patch
884 */
b37ad28b 885__be32
b591480b
BF		 886nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
887 struct nfsd4_compound_state *cstate,
888 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 889{
27459f09 890 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 891 struct nfs4_client *conf, *unconf;
1da177e4
LT		 892 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
893 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 894 __be32 status;
1da177e4
LT		 895
896 if (STALE_CLIENTID(clid))
897 return nfserr_stale_clientid;
898 /*
899 * XXX The Duplicate Request Cache (DRC) has been checked (??)
900 * We get here on a DRC miss.
901 */
902
903 nfs4_lock_state();
21ab45a4
N		 904
905 conf = find_confirmed_client(clid);
906 unconf = find_unconfirmed_client(clid);
907
908 status = nfserr_clid_inuse;
27459f09 909 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 910 goto out;
27459f09 911 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 912 goto out;
913
1da177e4 914 if ((conf && unconf) &&
599e0a22
BF		 915 (same_verf(&unconf->cl_confirm, &confirm)) &&
916 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 917 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
599e0a22 918 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 919 /* CASE 1:
920 * unconf record that matches input clientid and input confirm.
921 * conf record that matches input clientid.
922 * conf and unconf records match names, verifiers
923 */
599e0a22 924 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 925 status = nfserr_clid_inuse;
926 else {
1a69c179
N		 927 /* XXX: We just turn off callbacks until we can handle
928 * change request correctly. */
cb36d634 929 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 930 gen_confirm(conf);
46309029 931 nfsd4_remove_clid_dir(unconf);
1a69c179 932 expire_client(unconf);
1da177e4 933 status = nfs_ok;
1a69c179 934
1da177e4 935 }
7c79f737 936 } else if ((conf && !unconf) ||
1da177e4 937 ((conf && unconf) &&
599e0a22 938 (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 939 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 940 /* CASE 2:
941 * conf record that matches input clientid.
942 * if unconf record matches input clientid, then
943 * unconf->cl_name or unconf->cl_verifier don't match the
944 * conf record.
945 */
599e0a22 946 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 947 status = nfserr_clid_inuse;
21ab45a4 948 else
1da177e4 949 status = nfs_ok;
7c79f737 950 } else if (!conf && unconf
599e0a22 951 && same_verf(&unconf->cl_confirm, &confirm)) {
7c79f737
N		 952 /* CASE 3:
953 * conf record not found.
954 * unconf record found.
955 * unconf->cl_confirm matches input confirm
956 */
599e0a22 957 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 958 status = nfserr_clid_inuse;
959 } else {
1a69c179
N		 960 unsigned int hash =
961 clientstr_hashval(unconf->cl_recdir);
962 conf = find_confirmed_client_by_str(unconf->cl_recdir,
963 hash);
964 if (conf) {
c7b9a459 965 nfsd4_remove_clid_dir(conf);
1a69c179
N		 966 expire_client(conf);
967 }
1da177e4 968 move_to_confirmed(unconf);
21ab45a4 969 conf = unconf;
1a69c179 970 status = nfs_ok;
1da177e4 971 }
599e0a22
BF		 972 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
973 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737
N		 974 &confirm)))) {
975 /* CASE 4:
976 * conf record not found, or if conf, conf->cl_confirm does not
977 * match input confirm.
978 * unconf record not found, or if unconf, unconf->cl_confirm
979 * does not match input confirm.
980 */
1da177e4 981 status = nfserr_stale_clientid;
7c79f737 982 } else {
08e8987c
N		 983 /* check that we have hit one of the cases...*/
984 status = nfserr_clid_inuse;
985 }
1da177e4
LT		 986out:
987 if (!status)
21ab45a4 988 nfsd4_probe_callback(conf);
1da177e4
LT		 989 nfs4_unlock_state();
990 return status;
991}
992
1da177e4
LT		 993/* OPEN Share state helper functions */
994static inline struct nfs4_file *
995alloc_init_file(struct inode *ino)
996{
997 struct nfs4_file *fp;
998 unsigned int hashval = file_hashval(ino);
999
e60d4398
N		 1000 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1001 if (fp) {
13cd2184 1002 kref_init(&fp->fi_ref);
1da177e4 1003 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 1004 INIT_LIST_HEAD(&fp->fi_stateids);
1005 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1006 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1007 fp->fi_inode = igrab(ino);
1008 fp->fi_id = current_fileid++;
47f9940c 1009 fp->fi_had_conflict = false;
1da177e4
LT		 1010 return fp;
1011 }
1012 return NULL;
1013}
1014
e60d4398 1015static void
e18b890b 1016nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1017{
e60d4398
N		 1018 if (*slab == NULL)
1019 return;
1a1d92c1 1020 kmem_cache_destroy(*slab);
e60d4398 1021 *slab = NULL;
1da177e4
LT		 1022}
1023
1024static void
1025nfsd4_free_slabs(void)
1026{
e60d4398
N		 1027 nfsd4_free_slab(&stateowner_slab);
1028 nfsd4_free_slab(&file_slab);
5ac049ac 1029 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1030 nfsd4_free_slab(&deleg_slab);
e60d4398 1031}
1da177e4 1032
e60d4398
N		 1033static int
1034nfsd4_init_slabs(void)
1035{
1036 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1037 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1038 if (stateowner_slab == NULL)
1039 goto out_nomem;
1040 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1041 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1042 if (file_slab == NULL)
1043 goto out_nomem;
5ac049ac 1044 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1045 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1046 if (stateid_slab == NULL)
1047 goto out_nomem;
5b2d21c1 1048 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1049 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1050 if (deleg_slab == NULL)
1051 goto out_nomem;
e60d4398
N		 1052 return 0;
1053out_nomem:
1054 nfsd4_free_slabs();
1055 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1056 return -ENOMEM;
1da177e4
LT		 1057}
1058
1059void
1060nfs4_free_stateowner(struct kref *kref)
1061{
1062 struct nfs4_stateowner *sop =
1063 container_of(kref, struct nfs4_stateowner, so_ref);
1064 kfree(sop->so_owner.data);
1065 kmem_cache_free(stateowner_slab, sop);
1066}
1067
1068static inline struct nfs4_stateowner *
1069alloc_stateowner(struct xdr_netobj *owner)
1070{
1071 struct nfs4_stateowner *sop;
1072
1073 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1074 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1075 memcpy(sop->so_owner.data, owner->data, owner->len);
1076 sop->so_owner.len = owner->len;
1077 kref_init(&sop->so_ref);
1078 return sop;
1079 }
1080 kmem_cache_free(stateowner_slab, sop);
1081 }
1082 return NULL;
1083}
1084
1085static struct nfs4_stateowner *
1086alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1087 struct nfs4_stateowner *sop;
1088 struct nfs4_replay *rp;
1089 unsigned int idhashval;
1090
1091 if (!(sop = alloc_stateowner(&open->op_owner)))
1092 return NULL;
1093 idhashval = ownerid_hashval(current_ownerid);
1094 INIT_LIST_HEAD(&sop->so_idhash);
1095 INIT_LIST_HEAD(&sop->so_strhash);
1096 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1097 INIT_LIST_HEAD(&sop->so_stateids);
1098 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1099 INIT_LIST_HEAD(&sop->so_close_lru);
1100 sop->so_time = 0;
1101 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1102 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1103 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1104 sop->so_is_open_owner = 1;
1105 sop->so_id = current_ownerid++;
1106 sop->so_client = clp;
1107 sop->so_seqid = open->op_seqid;
1108 sop->so_confirmed = 0;
1109 rp = &sop->so_replay;
de1ae286 1110 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1111 rp->rp_buflen = 0;
1112 rp->rp_buf = rp->rp_ibuf;
1113 return sop;
1114}
1115
1116static void
1117release_stateid_lockowners(struct nfs4_stateid *open_stp)
1118{
1119 struct nfs4_stateowner *lock_sop;
1120
ea1da636
N		 1121 while (!list_empty(&open_stp->st_lockowners)) {
1122 lock_sop = list_entry(open_stp->st_lockowners.next,
1123 struct nfs4_stateowner, so_perstateid);
1124 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1125 BUG_ON(lock_sop->so_is_open_owner);
1126 release_stateowner(lock_sop);
1127 }
1128}
1129
1130static void
1131unhash_stateowner(struct nfs4_stateowner *sop)
1132{
1133 struct nfs4_stateid *stp;
1134
1135 list_del(&sop->so_idhash);
1136 list_del(&sop->so_strhash);
6fa305de 1137 if (sop->so_is_open_owner)
1da177e4 1138 list_del(&sop->so_perclient);
ea1da636
N		 1139 list_del(&sop->so_perstateid);
1140 while (!list_empty(&sop->so_stateids)) {
1141 stp = list_entry(sop->so_stateids.next,
1142 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1143 if (sop->so_is_open_owner)
1144 release_stateid(stp, OPEN_STATE);
1145 else
1146 release_stateid(stp, LOCK_STATE);
1147 }
1148}
1149
1150static void
1151release_stateowner(struct nfs4_stateowner *sop)
1152{
1153 unhash_stateowner(sop);
1154 list_del(&sop->so_close_lru);
1155 nfs4_put_stateowner(sop);
1156}
1157
1158static inline void
1159init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1160 struct nfs4_stateowner *sop = open->op_stateowner;
1161 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1162
1163 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1164 INIT_LIST_HEAD(&stp->st_perstateowner);
1165 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1166 INIT_LIST_HEAD(&stp->st_perfile);
1167 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1168 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1169 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1170 stp->st_stateowner = sop;
13cd2184 1171 get_nfs4_file(fp);
1da177e4
LT		 1172 stp->st_file = fp;
1173 stp->st_stateid.si_boot = boot_time;
1174 stp->st_stateid.si_stateownerid = sop->so_id;
1175 stp->st_stateid.si_fileid = fp->fi_id;
1176 stp->st_stateid.si_generation = 0;
1177 stp->st_access_bmap = 0;
1178 stp->st_deny_bmap = 0;
1179 __set_bit(open->op_share_access, &stp->st_access_bmap);
1180 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1181 stp->st_openstp = NULL;
1da177e4
LT		 1182}
1183
1184static void
1185release_stateid(struct nfs4_stateid *stp, int flags)
1186{
1187 struct file *filp = stp->st_vfs_file;
1188
1189 list_del(&stp->st_hash);
1da177e4 1190 list_del(&stp->st_perfile);
ea1da636 1191 list_del(&stp->st_perstateowner);
1da177e4
LT		 1192 if (flags & OPEN_STATE) {
1193 release_stateid_lockowners(stp);
1194 stp->st_vfs_file = NULL;
1195 nfsd_close(filp);
1da177e4
LT		 1196 } else if (flags & LOCK_STATE)
1197 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1198 put_nfs4_file(stp->st_file);
5ac049ac 1199 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1200}
1201
fd39ca9a 1202static void
1da177e4
LT		 1203move_to_close_lru(struct nfs4_stateowner *sop)
1204{
1205 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1206
358dd55a 1207 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1208 sop->so_time = get_seconds();
1209}
1210
1da177e4 1211static int
599e0a22
BF		 1212same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1213 clientid_t *clid)
1214{
1215 return (sop->so_owner.len == owner->len) &&
1216 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1217 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1218}
1219
1220static struct nfs4_stateowner *
1221find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1222{
1223 struct nfs4_stateowner *so = NULL;
1224
1225 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1226 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1227 return so;
1228 }
1229 return NULL;
1230}
1231
1232/* search file_hashtbl[] for file */
1233static struct nfs4_file *
1234find_file(struct inode *ino)
1235{
1236 unsigned int hashval = file_hashval(ino);
1237 struct nfs4_file *fp;
1238
1239 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1240 if (fp->fi_inode == ino) {
1241 get_nfs4_file(fp);
1da177e4 1242 return fp;
13cd2184 1243 }
1da177e4
LT		 1244 }
1245 return NULL;
1246}
1247
ba5a6a19
BF		 1248static int access_valid(u32 x)
1249{
1250 return (x > 0 && x < 4);
1251}
1252
1253static int deny_valid(u32 x)
1254{
1255 return (x >= 0 && x < 5);
1256}
1da177e4 1257
fd39ca9a 1258static void
1da177e4
LT		 1259set_access(unsigned int *access, unsigned long bmap) {
1260 int i;
1261
1262 *access = 0;
1263 for (i = 1; i < 4; i++) {
1264 if (test_bit(i, &bmap))
1265 *access |= i;
1266 }
1267}
1268
fd39ca9a 1269static void
1da177e4
LT		 1270set_deny(unsigned int *deny, unsigned long bmap) {
1271 int i;
1272
1273 *deny = 0;
1274 for (i = 0; i < 4; i++) {
1275 if (test_bit(i, &bmap))
1276 *deny |= i ;
1277 }
1278}
1279
1280static int
1281test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1282 unsigned int access, deny;
1283
1284 set_access(&access, stp->st_access_bmap);
1285 set_deny(&deny, stp->st_deny_bmap);
1286 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1287 return 0;
1288 return 1;
1289}
1290
1291/*
1292 * Called to check deny when READ with all zero stateid or
1293 * WRITE with all zero or all one stateid
1294 */
b37ad28b 1295static __be32
1da177e4
LT		 1296nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1297{
1298 struct inode *ino = current_fh->fh_dentry->d_inode;
1299 struct nfs4_file *fp;
1300 struct nfs4_stateid *stp;
b37ad28b 1301 __be32 ret;
1da177e4
LT		 1302
1303 dprintk("NFSD: nfs4_share_conflict\n");
1304
1305 fp = find_file(ino);
13cd2184
N		 1306 if (!fp)
1307 return nfs_ok;
b700949b 1308 ret = nfserr_locked;
1da177e4 1309 /* Search for conflicting share reservations */
13cd2184
N		 1310 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1311 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1312 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1313 goto out;
1da177e4 1314 }
13cd2184
N		 1315 ret = nfs_ok;
1316out:
1317 put_nfs4_file(fp);
1318 return ret;
1da177e4
LT		 1319}
1320
1321static inline void
1322nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1323{
1324 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1325 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1326 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1327 }
1328}
1329
1330/*
1331 * Recall a delegation
1332 */
1333static int
1334do_recall(void *__dp)
1335{
1336 struct nfs4_delegation *dp = __dp;
1337
47f9940c 1338 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1339 nfsd4_cb_recall(dp);
1340 return 0;
1341}
1342
1343/*
1344 * Spawn a thread to perform a recall on the delegation represented
1345 * by the lease (file_lock)
1346 *
1347 * Called from break_lease() with lock_kernel() held.
1348 * Note: we assume break_lease will only call this *once* for any given
1349 * lease.
1350 */
1351static
1352void nfsd_break_deleg_cb(struct file_lock *fl)
1353{
1354 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1355 struct task_struct *t;
1356
1357 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1358 if (!dp)
1359 return;
1360
1361 /* We're assuming the state code never drops its reference
1362 * without first removing the lease. Since we're in this lease
1363 * callback (and since the lease code is serialized by the kernel
1364 * lock) we know the server hasn't removed the lease yet, we know
1365 * it's safe to take a reference: */
1366 atomic_inc(&dp->dl_count);
1367
1368 spin_lock(&recall_lock);
1369 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1370 spin_unlock(&recall_lock);
1371
1372 /* only place dl_time is set. protected by lock_kernel*/
1373 dp->dl_time = get_seconds();
1374
1375 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1376 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1377
1378 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1379 if (IS_ERR(t)) {
1380 struct nfs4_client *clp = dp->dl_client;
1381
1382 printk(KERN_INFO "NFSD: Callback thread failed for "
1383 "for client (clientid %08x/%08x)\n",
1384 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1385 nfs4_put_delegation(dp);
1386 }
1387}
1388
1389/*
1390 * The file_lock is being reapd.
1391 *
1392 * Called by locks_free_lock() with lock_kernel() held.
1393 */
1394static
1395void nfsd_release_deleg_cb(struct file_lock *fl)
1396{
1397 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1398
1399 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1400
1401 if (!(fl->fl_flags & FL_LEASE) || !dp)
1402 return;
1403 dp->dl_flock = NULL;
1404}
1405
1406/*
1407 * Set the delegation file_lock back pointer.
1408 *
a9933cea 1409 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1410 */
1411static
1412void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1413{
1414 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1415
1416 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1417 if (!dp)
1418 return;
1419 dp->dl_flock = new;
1420}
1421
1422/*
a9933cea 1423 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1424 */
1425static
1426int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1427{
1428 struct nfs4_delegation *onlistd =
1429 (struct nfs4_delegation *)onlist->fl_owner;
1430 struct nfs4_delegation *tryd =
1431 (struct nfs4_delegation *)try->fl_owner;
1432
1433 if (onlist->fl_lmops != try->fl_lmops)
1434 return 0;
1435
1436 return onlistd->dl_client == tryd->dl_client;
1437}
1438
1439
1440static
1441int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1442{
1443 if (arg & F_UNLCK)
1444 return lease_modify(onlist, arg);
1445 else
1446 return -EAGAIN;
1447}
1448
fd39ca9a 1449static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1450 .fl_break = nfsd_break_deleg_cb,
1451 .fl_release_private = nfsd_release_deleg_cb,
1452 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1453 .fl_mylease = nfsd_same_client_deleg_cb,
1454 .fl_change = nfsd_change_deleg_cb,
1455};
1456
1457
b37ad28b 1458__be32
1da177e4
LT		 1459nfsd4_process_open1(struct nfsd4_open *open)
1460{
1da177e4
LT		 1461 clientid_t *clientid = &open->op_clientid;
1462 struct nfs4_client *clp = NULL;
1463 unsigned int strhashval;
1464 struct nfs4_stateowner *sop = NULL;
1465
1da177e4 1466 if (!check_name(open->op_owner))
0f442aa2 1467 return nfserr_inval;
1da177e4
LT		 1468
1469 if (STALE_CLIENTID(&open->op_clientid))
1470 return nfserr_stale_clientid;
1471
1472 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1473 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1474 open->op_stateowner = sop;
1475 if (!sop) {
1476 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1477 clp = find_confirmed_client(clientid);
1478 if (clp == NULL)
0f442aa2
BF		 1479 return nfserr_expired;
1480 goto renew;
1da177e4 1481 }
0f442aa2
BF		 1482 if (!sop->so_confirmed) {
1483 /* Replace unconfirmed owners without checking for replay. */
1484 clp = sop->so_client;
1485 release_stateowner(sop);
1486 open->op_stateowner = NULL;
1487 goto renew;
1488 }
1489 if (open->op_seqid == sop->so_seqid - 1) {
1490 if (sop->so_replay.rp_buflen)
a90b061c 1491 return nfserr_replay_me;
0f442aa2
BF		 1492 /* The original OPEN failed so spectacularly
1493 * that we don't even have replay data saved!
1494 * Therefore, we have no choice but to continue
1495 * processing this OPEN; presumably, we'll
1496 * fail again for the same reason.
1497 */
1498 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1499 goto renew;
1500 }
1501 if (open->op_seqid != sop->so_seqid)
1502 return nfserr_bad_seqid;
1da177e4 1503renew:
0f442aa2
BF		 1504 if (open->op_stateowner == NULL) {
1505 sop = alloc_init_open_stateowner(strhashval, clp, open);
1506 if (sop == NULL)
1507 return nfserr_resource;
1508 open->op_stateowner = sop;
1509 }
1510 list_del_init(&sop->so_close_lru);
1da177e4 1511 renew_client(sop->so_client);
0f442aa2 1512 return nfs_ok;
1da177e4
LT		 1513}
1514
b37ad28b 1515static inline __be32
4a6e43e6
N		 1516nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1517{
1518 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1519 return nfserr_openmode;
1520 else
1521 return nfs_ok;
1522}
1523
52f4fb43
N		 1524static struct nfs4_delegation *
1525find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1526{
1527 struct nfs4_delegation *dp;
1528
ea1da636 1529 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1530 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1531 return dp;
1532 }
1533 return NULL;
1534}
1535
b37ad28b 1536static __be32
567d9829
N		 1537nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1538 struct nfs4_delegation **dp)
1539{
1540 int flags;
b37ad28b 1541 __be32 status = nfserr_bad_stateid;
567d9829
N		 1542
1543 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1544 if (*dp == NULL)
c44c5eeb 1545 goto out;
567d9829
N		 1546 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1547 RD_STATE : WR_STATE;
1548 status = nfs4_check_delegmode(*dp, flags);
1549 if (status)
1550 *dp = NULL;
c44c5eeb
N		 1551out:
1552 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1553 return nfs_ok;
1554 if (status)
1555 return status;
1556 open->op_stateowner->so_confirmed = 1;
1557 return nfs_ok;
567d9829
N		 1558}
1559
b37ad28b 1560static __be32
1da177e4
LT		 1561nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1562{
1563 struct nfs4_stateid *local;
b37ad28b 1564 __be32 status = nfserr_share_denied;
1da177e4
LT		 1565 struct nfs4_stateowner *sop = open->op_stateowner;
1566
8beefa24 1567 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1568 /* ignore lock owners */
1569 if (local->st_stateowner->so_is_open_owner == 0)
1570 continue;
1571 /* remember if we have seen this open owner */
1572 if (local->st_stateowner == sop)
1573 *stpp = local;
1574 /* check for conflicting share reservations */
1575 if (!test_share(local, open))
1576 goto out;
1577 }
1578 status = 0;
1579out:
1580 return status;
1581}
1582
5ac049ac
N		 1583static inline struct nfs4_stateid *
1584nfs4_alloc_stateid(void)
1585{
1586 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1587}
1588
b37ad28b 1589static __be32
1da177e4 1590nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1591 struct nfs4_delegation *dp,
1da177e4
LT		 1592 struct svc_fh *cur_fh, int flags)
1593{
1594 struct nfs4_stateid *stp;
1da177e4 1595
5ac049ac 1596 stp = nfs4_alloc_stateid();
1da177e4
LT		 1597 if (stp == NULL)
1598 return nfserr_resource;
1599
567d9829
N		 1600 if (dp) {
1601 get_file(dp->dl_vfs_file);
1602 stp->st_vfs_file = dp->dl_vfs_file;
1603 } else {
b37ad28b 1604 __be32 status;
567d9829
N		 1605 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1606 &stp->st_vfs_file);
1607 if (status) {
1608 if (status == nfserr_dropit)
1609 status = nfserr_jukebox;
5ac049ac 1610 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1611 return status;
1612 }
1da177e4 1613 }
1da177e4
LT		 1614 *stpp = stp;
1615 return 0;
1616}
1617
b37ad28b 1618static inline __be32
1da177e4
LT		 1619nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1620 struct nfsd4_open *open)
1621{
1622 struct iattr iattr = {
1623 .ia_valid = ATTR_SIZE,
1624 .ia_size = 0,
1625 };
1626 if (!open->op_truncate)
1627 return 0;
1628 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1629 return nfserr_inval;
1da177e4
LT		 1630 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1631}
1632
b37ad28b 1633static __be32
1da177e4
LT		 1634nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1635{
1636 struct file *filp = stp->st_vfs_file;
7eaa36e2 1637 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1638 unsigned int share_access, new_writer;
b37ad28b 1639 __be32 status;
1da177e4
LT		 1640
1641 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1642 new_writer = (~share_access) & open->op_share_access
1643 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1644
6c26d08f 1645 if (new_writer) {
b37ad28b
AV		 1646 int err = get_write_access(inode);
1647 if (err)
1648 return nfserrno(err);
6c26d08f 1649 }
1da177e4
LT		 1650 status = nfsd4_truncate(rqstp, cur_fh, open);
1651 if (status) {
6c26d08f
BF		 1652 if (new_writer)
1653 put_write_access(inode);
1da177e4
LT		 1654 return status;
1655 }
1656 /* remember the open */
6c26d08f 1657 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1658 set_bit(open->op_share_access, &stp->st_access_bmap);
1659 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1660
1661 return nfs_ok;
1662}
1663
1664
1da177e4 1665static void
37515177 1666nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1667{
37515177
N		 1668 open->op_stateowner->so_confirmed = 1;
1669 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1670}
1671
1672/*
1673 * Attempt to hand out a delegation.
1674 */
1675static void
1676nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1677{
1678 struct nfs4_delegation *dp;
1679 struct nfs4_stateowner *sop = stp->st_stateowner;
1680 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1681 struct file_lock fl, *flp = &fl;
1682 int status, flag = 0;
1683
1684 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1685 open->op_recall = 0;
1686 switch (open->op_claim_type) {
1687 case NFS4_OPEN_CLAIM_PREVIOUS:
1688 if (!atomic_read(&cb->cb_set))
1689 open->op_recall = 1;
1690 flag = open->op_delegate_type;
1691 if (flag == NFS4_OPEN_DELEGATE_NONE)
1692 goto out;
1693 break;
1694 case NFS4_OPEN_CLAIM_NULL:
1695 /* Let's not give out any delegations till everyone's
1696 * had the chance to reclaim theirs.... */
1697 if (nfs4_in_grace())
1698 goto out;
1699 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1700 goto out;
1701 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1702 flag = NFS4_OPEN_DELEGATE_WRITE;
1703 else
1704 flag = NFS4_OPEN_DELEGATE_READ;
1705 break;
1706 default:
1707 goto out;
1708 }
1da177e4
LT		 1709
1710 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1711 if (dp == NULL) {
1712 flag = NFS4_OPEN_DELEGATE_NONE;
1713 goto out;
1714 }
1715 locks_init_lock(&fl);
1716 fl.fl_lmops = &nfsd_lease_mng_ops;
1717 fl.fl_flags = FL_LEASE;
1718 fl.fl_end = OFFSET_MAX;
1719 fl.fl_owner = (fl_owner_t)dp;
1720 fl.fl_file = stp->st_vfs_file;
1721 fl.fl_pid = current->tgid;
1722
a9933cea 1723 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1724 * the lock_manager callbacks fl_mylease and fl_change are used
1725 */
a9933cea 1726 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1727 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1728 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1729 unhash_delegation(dp);
1da177e4
LT		 1730 flag = NFS4_OPEN_DELEGATE_NONE;
1731 goto out;
1732 }
1733
1734 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1735
1736 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1737 dp->dl_stateid.si_boot,
1738 dp->dl_stateid.si_stateownerid,
1739 dp->dl_stateid.si_fileid,
1740 dp->dl_stateid.si_generation);
1741out:
7b190fec
N		 1742 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1743 && flag == NFS4_OPEN_DELEGATE_NONE
1744 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1745 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1746 open->op_delegate_type = flag;
1747}
1748
1749/*
1750 * called with nfs4_lock_state() held.
1751 */
b37ad28b 1752__be32
1da177e4
LT		 1753nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1754{
1755 struct nfs4_file *fp = NULL;
1756 struct inode *ino = current_fh->fh_dentry->d_inode;
1757 struct nfs4_stateid *stp = NULL;
567d9829 1758 struct nfs4_delegation *dp = NULL;
b37ad28b 1759 __be32 status;
1da177e4
LT		 1760
1761 status = nfserr_inval;
ba5a6a19
BF		 1762 if (!access_valid(open->op_share_access)
1763 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1764 goto out;
1765 /*
1766 * Lookup file; if found, lookup stateid and check open request,
1767 * and check for delegations in the process of being recalled.
1768 * If not found, create the nfs4_file struct
1769 */
1770 fp = find_file(ino);
1771 if (fp) {
1772 if ((status = nfs4_check_open(fp, open, &stp)))
1773 goto out;
c44c5eeb
N		 1774 status = nfs4_check_deleg(fp, open, &dp);
1775 if (status)
1776 goto out;
1da177e4 1777 } else {
c44c5eeb
N		 1778 status = nfserr_bad_stateid;
1779 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1780 goto out;
1da177e4
LT		 1781 status = nfserr_resource;
1782 fp = alloc_init_file(ino);
1783 if (fp == NULL)
1784 goto out;
1785 }
1786
1787 /*
1788 * OPEN the file, or upgrade an existing OPEN.
1789 * If truncate fails, the OPEN fails.
1790 */
1791 if (stp) {
1792 /* Stateid was found, this is an OPEN upgrade */
1793 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1794 if (status)
1795 goto out;
444c2c07 1796 update_stateid(&stp->st_stateid);
1da177e4
LT		 1797 } else {
1798 /* Stateid was not found, this is a new OPEN */
1799 int flags = 0;
9ecb6a08
BF		 1800 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1801 flags |= MAY_READ;
1da177e4 1802 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1803 flags |= MAY_WRITE;
567d9829
N		 1804 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1805 if (status)
1da177e4
LT		 1806 goto out;
1807 init_stateid(stp, fp, open);
1808 status = nfsd4_truncate(rqstp, current_fh, open);
1809 if (status) {
1810 release_stateid(stp, OPEN_STATE);
1811 goto out;
1812 }
1813 }
1814 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1815
1816 /*
1817 * Attempt to hand out a delegation. No error return, because the
1818 * OPEN succeeds even if we fail.
1819 */
1820 nfs4_open_delegation(current_fh, open, stp);
1821
1822 status = nfs_ok;
1823
1824 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1825 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1826 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1827out:
13cd2184
N		 1828 if (fp)
1829 put_nfs4_file(fp);
37515177
N		 1830 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1831 nfs4_set_claim_prev(open);
1da177e4
LT		 1832 /*
1833 * To finish the open response, we just need to set the rflags.
1834 */
1835 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1836 if (!open->op_stateowner->so_confirmed)
1837 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1838
1839 return status;
1840}
1841
58da282b 1842static struct workqueue_struct *laundry_wq;
c4028958
DH		 1843static void laundromat_main(struct work_struct *);
1844static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1845
b37ad28b 1846__be32
b591480b
BF		 1847nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1848 clientid_t *clid)
1da177e4
LT		 1849{
1850 struct nfs4_client *clp;
b37ad28b 1851 __be32 status;
1da177e4
LT		 1852
1853 nfs4_lock_state();
1854 dprintk("process_renew(%08x/%08x): starting\n",
1855 clid->cl_boot, clid->cl_id);
1856 status = nfserr_stale_clientid;
1857 if (STALE_CLIENTID(clid))
1858 goto out;
1859 clp = find_confirmed_client(clid);
1860 status = nfserr_expired;
1861 if (clp == NULL) {
1862 /* We assume the client took too long to RENEW. */
1863 dprintk("nfsd4_renew: clientid not found!\n");
1864 goto out;
1865 }
1866 renew_client(clp);
1867 status = nfserr_cb_path_down;
ea1da636 1868 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1869 && !atomic_read(&clp->cl_callback.cb_set))
1870 goto out;
1871 status = nfs_ok;
1872out:
1873 nfs4_unlock_state();
1874 return status;
1875}
1876
a76b4319
N		 1877static void
1878end_grace(void)
1879{
1880 dprintk("NFSD: end of grace period\n");
c7b9a459 1881 nfsd4_recdir_purge_old();
a76b4319
N		 1882 in_grace = 0;
1883}
1884
fd39ca9a 1885static time_t
1da177e4
LT		 1886nfs4_laundromat(void)
1887{
1888 struct nfs4_client *clp;
1889 struct nfs4_stateowner *sop;
1890 struct nfs4_delegation *dp;
1891 struct list_head *pos, *next, reaplist;
1892 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1893 time_t t, clientid_val = NFSD_LEASE_TIME;
1894 time_t u, test_val = NFSD_LEASE_TIME;
1895
1896 nfs4_lock_state();
1897
1898 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1899 if (in_grace)
1900 end_grace();
1da177e4
LT		 1901 list_for_each_safe(pos, next, &client_lru) {
1902 clp = list_entry(pos, struct nfs4_client, cl_lru);
1903 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1904 t = clp->cl_time - cutoff;
1905 if (clientid_val > t)
1906 clientid_val = t;
1907 break;
1908 }
1909 dprintk("NFSD: purging unused client (clientid %08x)\n",
1910 clp->cl_clientid.cl_id);
c7b9a459 1911 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1912 expire_client(clp);
1913 }
1914 INIT_LIST_HEAD(&reaplist);
1915 spin_lock(&recall_lock);
1916 list_for_each_safe(pos, next, &del_recall_lru) {
1917 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1918 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1919 u = dp->dl_time - cutoff;
1920 if (test_val > u)
1921 test_val = u;
1922 break;
1923 }
1924 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1925 dp, dp->dl_flock);
1926 list_move(&dp->dl_recall_lru, &reaplist);
1927 }
1928 spin_unlock(&recall_lock);
1929 list_for_each_safe(pos, next, &reaplist) {
1930 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1931 list_del_init(&dp->dl_recall_lru);
1932 unhash_delegation(dp);
1933 }
1934 test_val = NFSD_LEASE_TIME;
1935 list_for_each_safe(pos, next, &close_lru) {
1936 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1937 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1938 u = sop->so_time - cutoff;
1939 if (test_val > u)
1940 test_val = u;
1941 break;
1942 }
1943 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1944 sop->so_id);
358dd55a 1945 release_stateowner(sop);
1da177e4
LT		 1946 }
1947 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1948 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1949 nfs4_unlock_state();
1950 return clientid_val;
1951}
1952
1953void
c4028958 1954laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1955{
1956 time_t t;
1957
1958 t = nfs4_laundromat();
1959 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1960 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1961}
1962
fd39ca9a 1963static struct nfs4_stateowner *
f8816512
N		 1964search_close_lru(u32 st_id, int flags)
1965{
1da177e4
LT		 1966 struct nfs4_stateowner *local = NULL;
1967
1da177e4
LT		 1968 if (flags & CLOSE_STATE) {
1969 list_for_each_entry(local, &close_lru, so_close_lru) {
1970 if (local->so_id == st_id)
1971 return local;
1972 }
1973 }
1974 return NULL;
1975}
1976
1977static inline int
1978nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1979{
7eaa36e2 1980 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1981}
1982
1983static int
1984STALE_STATEID(stateid_t *stateid)
1985{
1986 if (stateid->si_boot == boot_time)
1987 return 0;
849823c5 1988 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1989 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1990 stateid->si_generation);
1991 return 1;
1992}
1993
1994static inline int
1995access_permit_read(unsigned long access_bmap)
1996{
1997 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1998 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1999 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2000}
2001
2002static inline int
2003access_permit_write(unsigned long access_bmap)
2004{
2005 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2006 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2007}
2008
2009static
b37ad28b 2010__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2011{
b37ad28b 2012 __be32 status = nfserr_openmode;
1da177e4
LT		 2013
2014 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2015 goto out;
2016 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2017 goto out;
2018 status = nfs_ok;
2019out:
2020 return status;
2021}
2022
b37ad28b 2023static inline __be32
1da177e4
LT		 2024check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2025{
2026 /* Trying to call delegreturn with a special stateid? Yuch: */
2027 if (!(flags & (RD_STATE | WR_STATE)))
2028 return nfserr_bad_stateid;
2029 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2030 return nfs_ok;
2031 else if (nfs4_in_grace()) {
2032 /* Answer in remaining cases depends on existance of
2033 * conflicting state; so we must wait out the grace period. */
2034 return nfserr_grace;
2035 } else if (flags & WR_STATE)
2036 return nfs4_share_conflict(current_fh,
2037 NFS4_SHARE_DENY_WRITE);
2038 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2039 return nfs4_share_conflict(current_fh,
2040 NFS4_SHARE_DENY_READ);
2041}
2042
2043/*
2044 * Allow READ/WRITE during grace period on recovered state only for files
2045 * that are not able to provide mandatory locking.
2046 */
2047static inline int
2048io_during_grace_disallowed(struct inode *inode, int flags)
2049{
2050 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2051 && MANDATORY_LOCK(inode);
2052}
2053
2054/*
2055* Checks for stateid operations
2056*/
b37ad28b 2057__be32
1da177e4
LT		 2058nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2059{
2060 struct nfs4_stateid *stp = NULL;
2061 struct nfs4_delegation *dp = NULL;
2062 stateid_t *stidp;
2063 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2064 __be32 status;
1da177e4
LT		 2065
2066 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2067 stateid->si_boot, stateid->si_stateownerid,
2068 stateid->si_fileid, stateid->si_generation);
2069 if (filpp)
2070 *filpp = NULL;
2071
2072 if (io_during_grace_disallowed(ino, flags))
2073 return nfserr_grace;
2074
2075 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2076 return check_special_stateids(current_fh, stateid, flags);
2077
2078 /* STALE STATEID */
2079 status = nfserr_stale_stateid;
2080 if (STALE_STATEID(stateid))
2081 goto out;
2082
2083 /* BAD STATEID */
2084 status = nfserr_bad_stateid;
2085 if (!stateid->si_fileid) { /* delegation stateid */
2086 if(!(dp = find_delegation_stateid(ino, stateid))) {
2087 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2088 goto out;
2089 }
2090 stidp = &dp->dl_stateid;
2091 } else { /* open or lock stateid */
2092 if (!(stp = find_stateid(stateid, flags))) {
2093 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2094 goto out;
2095 }
2096 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2097 goto out;
2098 if (!stp->st_stateowner->so_confirmed)
2099 goto out;
2100 stidp = &stp->st_stateid;
2101 }
2102 if (stateid->si_generation > stidp->si_generation)
2103 goto out;
2104
2105 /* OLD STATEID */
2106 status = nfserr_old_stateid;
2107 if (stateid->si_generation < stidp->si_generation)
2108 goto out;
2109 if (stp) {
2110 if ((status = nfs4_check_openmode(stp,flags)))
2111 goto out;
2112 renew_client(stp->st_stateowner->so_client);
2113 if (filpp)
2114 *filpp = stp->st_vfs_file;
2115 } else if (dp) {
2116 if ((status = nfs4_check_delegmode(dp, flags)))
2117 goto out;
2118 renew_client(dp->dl_client);
2119 if (flags & DELEG_RET)
2120 unhash_delegation(dp);
2121 if (filpp)
2122 *filpp = dp->dl_vfs_file;
2123 }
2124 status = nfs_ok;
2125out:
2126 return status;
2127}
2128
4c4cd222
N		 2129static inline int
2130setlkflg (int type)
2131{
2132 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2133 RD_STATE : WR_STATE;
2134}
1da177e4
LT		 2135
2136/*
2137 * Checks for sequence id mutating operations.
2138 */
b37ad28b 2139static __be32
4c4cd222 2140nfs4_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 2141{
1da177e4
LT		 2142 struct nfs4_stateid *stp;
2143 struct nfs4_stateowner *sop;
2144
2145 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2146 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2147 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2148 stateid->si_generation);
3a4f98bb 2149
1da177e4
LT		 2150 *stpp = NULL;
2151 *sopp = NULL;
2152
1da177e4
LT		 2153 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2154 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2155 return nfserr_bad_stateid;
1da177e4
LT		 2156 }
2157
1da177e4 2158 if (STALE_STATEID(stateid))
3a4f98bb 2159 return nfserr_stale_stateid;
1da177e4
LT		 2160 /*
2161 * We return BAD_STATEID if filehandle doesn't match stateid,
2162 * the confirmed flag is incorrecly set, or the generation
2163 * number is incorrect.
1da177e4 2164 */
f8816512
N		 2165 stp = find_stateid(stateid, flags);
2166 if (stp == NULL) {
2167 /*
2168 * Also, we should make sure this isn't just the result of
2169 * a replayed close:
2170 */
2171 sop = search_close_lru(stateid->si_stateownerid, flags);
2172 if (sop == NULL)
2173 return nfserr_bad_stateid;
2174 *sopp = sop;
2175 goto check_replay;
2176 }
1da177e4 2177
4c4cd222 2178 if (lock) {
1da177e4 2179 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2180 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2181 struct nfs4_client *clp = sop->so_client;
4c4cd222 2182 int lkflg = 0;
b37ad28b 2183 __be32 status;
4c4cd222
N		 2184
2185 lkflg = setlkflg(lock->lk_type);
2186
2187 if (lock->lk_is_new) {
599e0a22
BF		 2188 if (!sop->so_is_open_owner)
2189 return nfserr_bad_stateid;
2190 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2191 return nfserr_bad_stateid;
599e0a22
BF		 2192 /* stp is the open stateid */
2193 status = nfs4_check_openmode(stp, lkflg);
2194 if (status)
2195 return status;
2196 } else {
2197 /* stp is the lock stateid */
2198 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2199 if (status)
2200 return status;
4c4cd222 2201 }
1da177e4
LT		 2202 }
2203
2204 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2205 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2206 return nfserr_bad_stateid;
1da177e4
LT		 2207 }
2208
2209 *stpp = stp;
2210 *sopp = sop = stp->st_stateowner;
2211
2212 /*
2213 * We now validate the seqid and stateid generation numbers.
2214 * For the moment, we ignore the possibility of
2215 * generation number wraparound.
2216 */
bd9aac52 2217 if (seqid != sop->so_seqid)
1da177e4
LT		 2218 goto check_replay;
2219
3a4f98bb
N		 2220 if (sop->so_confirmed && flags & CONFIRM) {
2221 printk("NFSD: preprocess_seqid_op: expected"
2222 " unconfirmed stateowner!\n");
2223 return nfserr_bad_stateid;
1da177e4 2224 }
3a4f98bb
N		 2225 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2226 printk("NFSD: preprocess_seqid_op: stateowner not"
2227 " confirmed yet!\n");
2228 return nfserr_bad_stateid;
1da177e4
LT		 2229 }
2230 if (stateid->si_generation > stp->st_stateid.si_generation) {
2231 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2232 return nfserr_bad_stateid;
1da177e4
LT		 2233 }
2234
1da177e4
LT		 2235 if (stateid->si_generation < stp->st_stateid.si_generation) {
2236 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2237 return nfserr_old_stateid;
1da177e4 2238 }
52fd004e 2239 renew_client(sop->so_client);
3a4f98bb 2240 return nfs_ok;
1da177e4 2241
1da177e4 2242check_replay:
bd9aac52 2243 if (seqid == sop->so_seqid - 1) {
849823c5 2244 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2245 /* indicate replay to calling function */
a90b061c 2246 return nfserr_replay_me;
1da177e4 2247 }
3a4f98bb
N		 2248 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2249 sop->so_seqid, seqid);
2250 *sopp = NULL;
2251 return nfserr_bad_seqid;
1da177e4
LT		 2252}
2253
b37ad28b 2254__be32
ca364317 2255nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2256 struct nfsd4_open_confirm *oc)
1da177e4 2257{
b37ad28b 2258 __be32 status;
1da177e4
LT		 2259 struct nfs4_stateowner *sop;
2260 struct nfs4_stateid *stp;
2261
2262 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2263 (int)cstate->current_fh.fh_dentry->d_name.len,
2264 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2265
ca364317 2266 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2267 if (status)
2268 return status;
1da177e4
LT		 2269
2270 nfs4_lock_state();
2271
ca364317
BF		 2272 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2273 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2274 CHECK_FH | CONFIRM | OPEN_STATE,
2275 &oc->oc_stateowner, &stp, NULL)))
2276 goto out;
2277
2278 sop = oc->oc_stateowner;
2279 sop->so_confirmed = 1;
2280 update_stateid(&stp->st_stateid);
2281 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2282 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2283 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2284 stp->st_stateid.si_boot,
2285 stp->st_stateid.si_stateownerid,
2286 stp->st_stateid.si_fileid,
2287 stp->st_stateid.si_generation);
c7b9a459
N		 2288
2289 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2290out:
f2327d9a 2291 if (oc->oc_stateowner) {
1da177e4 2292 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2293 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2294 }
1da177e4
LT		 2295 nfs4_unlock_state();
2296 return status;
2297}
2298
2299
2300/*
2301 * unset all bits in union bitmap (bmap) that
2302 * do not exist in share (from successful OPEN_DOWNGRADE)
2303 */
2304static void
2305reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2306{
2307 int i;
2308 for (i = 1; i < 4; i++) {
2309 if ((i & access) != i)
2310 __clear_bit(i, bmap);
2311 }
2312}
2313
2314static void
2315reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2316{
2317 int i;
2318 for (i = 0; i < 4; i++) {
2319 if ((i & deny) != i)
2320 __clear_bit(i, bmap);
2321 }
2322}
2323
b37ad28b 2324__be32
ca364317
BF		 2325nfsd4_open_downgrade(struct svc_rqst *rqstp,
2326 struct nfsd4_compound_state *cstate,
a4f1706a 2327 struct nfsd4_open_downgrade *od)
1da177e4 2328{
b37ad28b 2329 __be32 status;
1da177e4
LT		 2330 struct nfs4_stateid *stp;
2331 unsigned int share_access;
2332
2333 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2334 (int)cstate->current_fh.fh_dentry->d_name.len,
2335 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2336
ba5a6a19
BF		 2337 if (!access_valid(od->od_share_access)
2338 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2339 return nfserr_inval;
2340
2341 nfs4_lock_state();
ca364317
BF		 2342 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2343 od->od_seqid,
1da177e4
LT		 2344 &od->od_stateid,
2345 CHECK_FH | OPEN_STATE,
2346 &od->od_stateowner, &stp, NULL)))
2347 goto out;
2348
2349 status = nfserr_inval;
2350 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2351 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2352 stp->st_access_bmap, od->od_share_access);
2353 goto out;
2354 }
2355 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2356 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2357 stp->st_deny_bmap, od->od_share_deny);
2358 goto out;
2359 }
2360 set_access(&share_access, stp->st_access_bmap);
2361 nfs4_file_downgrade(stp->st_vfs_file,
2362 share_access & ~od->od_share_access);
2363
2364 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2365 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2366
2367 update_stateid(&stp->st_stateid);
2368 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2369 status = nfs_ok;
2370out:
f2327d9a 2371 if (od->od_stateowner) {
1da177e4 2372 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2373 cstate->replay_owner = od->od_stateowner;
f2327d9a 2374 }
1da177e4
LT		 2375 nfs4_unlock_state();
2376 return status;
2377}
2378
2379/*
2380 * nfs4_unlock_state() called after encode
2381 */
b37ad28b 2382__be32
ca364317 2383nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2384 struct nfsd4_close *close)
1da177e4 2385{
b37ad28b 2386 __be32 status;
1da177e4
LT		 2387 struct nfs4_stateid *stp;
2388
2389 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2390 (int)cstate->current_fh.fh_dentry->d_name.len,
2391 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2392
2393 nfs4_lock_state();
2394 /* check close_lru for replay */
ca364317
BF		 2395 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2396 close->cl_seqid,
1da177e4
LT		 2397 &close->cl_stateid,
2398 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2399 &close->cl_stateowner, &stp, NULL)))
2400 goto out;
1da177e4
LT		 2401 status = nfs_ok;
2402 update_stateid(&stp->st_stateid);
2403 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2404
04ef5954
BF		 2405 /* release_stateid() calls nfsd_close() if needed */
2406 release_stateid(stp, OPEN_STATE);
2407
2408 /* place unused nfs4_stateowners on so_close_lru list to be
2409 * released by the laundromat service after the lease period
2410 * to enable us to handle CLOSE replay
2411 */
2412 if (list_empty(&close->cl_stateowner->so_stateids))
2413 move_to_close_lru(close->cl_stateowner);
1da177e4 2414out:
f2327d9a 2415 if (close->cl_stateowner) {
1da177e4 2416 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2417 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2418 }
1da177e4
LT		 2419 nfs4_unlock_state();
2420 return status;
2421}
2422
b37ad28b 2423__be32
ca364317
BF		 2424nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2425 struct nfsd4_delegreturn *dr)
1da177e4 2426{
b37ad28b 2427 __be32 status;
1da177e4 2428
ca364317 2429 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2430 goto out;
2431
2432 nfs4_lock_state();
ca364317
BF		 2433 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2434 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2435 nfs4_unlock_state();
2436out:
2437 return status;
2438}
2439
2440
2441/*
2442 * Lock owner state (byte-range locks)
2443 */
2444#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2445#define LOCK_HASH_BITS 8
2446#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2447#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2448
2449#define lockownerid_hashval(id) \
2450 ((id) & LOCK_HASH_MASK)
2451
2452static inline unsigned int
2453lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2454 struct xdr_netobj *ownername)
2455{
2456 return (file_hashval(inode) + cl_id
2457 + opaque_hashval(ownername->data, ownername->len))
2458 & LOCK_HASH_MASK;
2459}
2460
2461static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2462static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2463static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2464
fd39ca9a 2465static struct nfs4_stateid *
1da177e4
LT		 2466find_stateid(stateid_t *stid, int flags)
2467{
2468 struct nfs4_stateid *local = NULL;
2469 u32 st_id = stid->si_stateownerid;
2470 u32 f_id = stid->si_fileid;
2471 unsigned int hashval;
2472
2473 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2474 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2475 hashval = stateid_hashval(st_id, f_id);
2476 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2477 if ((local->st_stateid.si_stateownerid == st_id) &&
2478 (local->st_stateid.si_fileid == f_id))
2479 return local;
2480 }
2481 }
2482 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
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;
2551 deny->ld_length = ~(u64)0;
2552 if (fl->fl_end != ~(u64)0)
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{
2649 return ((length == 0) || ((length != ~(u64)0) &&
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
BF		 2678 if ((status = fh_verify(rqstp, &cstate->current_fh,
2679 S_IFREG, 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,
2703 CHECK_FH | 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,
2730 CHECK_FH | 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
N		 2739 status = nfserr_grace;
2740 if (nfs4_in_grace() && !lock->lk_reclaim)
2741 goto out;
2742 status = nfserr_no_grace;
2743 if (!nfs4_in_grace() && lock->lk_reclaim)
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;
2769 if ((lock->lk_length == ~(u64)0) ||
2770 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2771 file_lock.fl_end = ~(u64)0;
2772 else
2773 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2774 nfs4_transform_lock_offset(&file_lock);
2775
2776 /*
2777 * Try to lock the file in the VFS.
2778 * Note: locks.c uses the BKL to protect the inode's lock list.
2779 */
2780
eb76b3fd
AA		 2781 /* XXX?: Just to divert the locks_release_private at the start of
2782 * locks_copy_lock: */
150b3934 2783 locks_init_lock(&conflock);
fd85b817 2784 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2785 switch (-err) {
1da177e4
LT		 2786 case 0: /* success! */
2787 update_stateid(&lock_stp->st_stateid);
2788 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2789 sizeof(stateid_t));
b8dd7b9a 2790 status = 0;
eb76b3fd
AA		 2791 break;
2792 case (EAGAIN): /* conflock holds conflicting lock */
2793 status = nfserr_denied;
2794 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2795 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2796 break;
1da177e4
LT		 2797 case (EDEADLK):
2798 status = nfserr_deadlock;
eb76b3fd 2799 break;
1da177e4 2800 default:
fd85b817 2801 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2802 status = nfserr_resource;
2803 break;
1da177e4 2804 }
1da177e4 2805out:
8a280510
BF		 2806 if (status && lock->lk_is_new && lock_sop)
2807 release_stateowner(lock_sop);
3a65588a
BF		 2808 if (lock->lk_replay_owner) {
2809 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2810 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2811 }
1da177e4
LT		 2812 nfs4_unlock_state();
2813 return status;
2814}
2815
2816/*
2817 * LOCKT operation
2818 */
b37ad28b 2819__be32
ca364317
BF		 2820nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2821 struct nfsd4_lockt *lockt)
1da177e4
LT		 2822{
2823 struct inode *inode;
2824 struct file file;
2825 struct file_lock file_lock;
fd85b817 2826 int error;
b37ad28b 2827 __be32 status;
1da177e4
LT		 2828
2829 if (nfs4_in_grace())
2830 return nfserr_grace;
2831
2832 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2833 return nfserr_inval;
2834
2835 lockt->lt_stateowner = NULL;
2836 nfs4_lock_state();
2837
2838 status = nfserr_stale_clientid;
849823c5 2839 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2840 goto out;
1da177e4 2841
ca364317 2842 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2843 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2844 if (status == nfserr_symlink)
2845 status = nfserr_inval;
2846 goto out;
2847 }
2848
ca364317 2849 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2850 locks_init_lock(&file_lock);
2851 switch (lockt->lt_type) {
2852 case NFS4_READ_LT:
2853 case NFS4_READW_LT:
2854 file_lock.fl_type = F_RDLCK;
2855 break;
2856 case NFS4_WRITE_LT:
2857 case NFS4_WRITEW_LT:
2858 file_lock.fl_type = F_WRLCK;
2859 break;
2860 default:
2861 printk("NFSD: nfs4_lockt: bad lock type!\n");
2862 status = nfserr_inval;
2863 goto out;
2864 }
2865
2866 lockt->lt_stateowner = find_lockstateowner_str(inode,
2867 &lockt->lt_clientid, &lockt->lt_owner);
2868 if (lockt->lt_stateowner)
2869 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2870 file_lock.fl_pid = current->tgid;
2871 file_lock.fl_flags = FL_POSIX;
d5b9026a 2872 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2873
2874 file_lock.fl_start = lockt->lt_offset;
2875 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2876 file_lock.fl_end = ~(u64)0;
2877 else
2878 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2879
2880 nfs4_transform_lock_offset(&file_lock);
2881
fd85b817 2882 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2883 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2884 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2885 * only the dentry:inode set.
2886 */
2887 memset(&file, 0, sizeof (struct file));
ca364317 2888 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2889
2890 status = nfs_ok;
fd85b817
ME		 2891 error = vfs_test_lock(&file, &file_lock);
2892 if (error) {
2893 status = nfserrno(error);
2894 goto out;
2895 }
9d6a8c5c 2896 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2897 status = nfserr_denied;
9d6a8c5c 2898 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2899 }
2900out:
2901 nfs4_unlock_state();
2902 return status;
2903}
2904
b37ad28b 2905__be32
ca364317 2906nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2907 struct nfsd4_locku *locku)
1da177e4
LT		 2908{
2909 struct nfs4_stateid *stp;
2910 struct file *filp = NULL;
2911 struct file_lock file_lock;
b37ad28b 2912 __be32 status;
b8dd7b9a 2913 int err;
1da177e4
LT		 2914
2915 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2916 (long long) locku->lu_offset,
2917 (long long) locku->lu_length);
2918
2919 if (check_lock_length(locku->lu_offset, locku->lu_length))
2920 return nfserr_inval;
2921
2922 nfs4_lock_state();
2923
ca364317 2924 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2925 locku->lu_seqid,
2926 &locku->lu_stateid,
2927 CHECK_FH | LOCK_STATE,
2928 &locku->lu_stateowner, &stp, NULL)))
2929 goto out;
2930
2931 filp = stp->st_vfs_file;
2932 BUG_ON(!filp);
2933 locks_init_lock(&file_lock);
2934 file_lock.fl_type = F_UNLCK;
2935 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2936 file_lock.fl_pid = current->tgid;
2937 file_lock.fl_file = filp;
2938 file_lock.fl_flags = FL_POSIX;
d5b9026a 2939 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2940 file_lock.fl_start = locku->lu_offset;
2941
2942 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2943 file_lock.fl_end = ~(u64)0;
2944 else
2945 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2946 nfs4_transform_lock_offset(&file_lock);
2947
2948 /*
2949 * Try to unlock the file in the VFS.
2950 */
fd85b817 2951 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2952 if (err) {
fd85b817 2953 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2954 goto out_nfserr;
2955 }
2956 /*
2957 * OK, unlock succeeded; the only thing left to do is update the stateid.
2958 */
2959 update_stateid(&stp->st_stateid);
2960 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2961
2962out:
f2327d9a 2963 if (locku->lu_stateowner) {
1da177e4 2964 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2965 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2966 }
1da177e4
LT		 2967 nfs4_unlock_state();
2968 return status;
2969
2970out_nfserr:
b8dd7b9a 2971 status = nfserrno(err);
1da177e4
LT		 2972 goto out;
2973}
2974
2975/*
2976 * returns
2977 * 1: locks held by lockowner
2978 * 0: no locks held by lockowner
2979 */
2980static int
2981check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2982{
2983 struct file_lock **flpp;
7eaa36e2 2984 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2985 int status = 0;
2986
2987 lock_kernel();
2988 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2989 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2990 status = 1;
2991 goto out;
796dadfd 2992 }
1da177e4
LT		 2993 }
2994out:
2995 unlock_kernel();
2996 return status;
2997}
2998
b37ad28b 2999__be32
b591480b
BF		 3000nfsd4_release_lockowner(struct svc_rqst *rqstp,
3001 struct nfsd4_compound_state *cstate,
3002 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 3003{
3004 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3005 struct nfs4_stateowner *sop;
3006 struct nfs4_stateid *stp;
1da177e4 3007 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3008 struct list_head matches;
3009 int i;
b37ad28b 3010 __be32 status;
1da177e4
LT		 3011
3012 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3013 clid->cl_boot, clid->cl_id);
3014
3015 /* XXX check for lease expiration */
3016
3017 status = nfserr_stale_clientid;
849823c5 3018 if (STALE_CLIENTID(clid))
1da177e4 3019 return status;
1da177e4
LT		 3020
3021 nfs4_lock_state();
3022
3e9e3dbe
N		 3023 status = nfserr_locks_held;
3024 /* XXX: we're doing a linear search through all the lockowners.
3025 * Yipes! For now we'll just hope clients aren't really using
3026 * release_lockowner much, but eventually we have to fix these
3027 * data structures. */
3028 INIT_LIST_HEAD(&matches);
3029 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3030 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3031 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3032 continue;
3033 list_for_each_entry(stp, &sop->so_stateids,
3034 st_perstateowner) {
3035 if (check_for_locks(stp->st_vfs_file, sop))
3036 goto out;
3037 /* Note: so_perclient unused for lockowners,
3038 * so it's OK to fool with here. */
3039 list_add(&sop->so_perclient, &matches);
3040 }
1da177e4 3041 }
3e9e3dbe
N		 3042 }
3043 /* Clients probably won't expect us to return with some (but not all)
3044 * of the lockowner state released; so don't release any until all
3045 * have been checked. */
3046 status = nfs_ok;
0fa822e4
N		 3047 while (!list_empty(&matches)) {
3048 sop = list_entry(matches.next, struct nfs4_stateowner,
3049 so_perclient);
3050 /* unhash_stateowner deletes so_perclient only
3051 * for openowners. */
3052 list_del(&sop->so_perclient);
3e9e3dbe 3053 release_stateowner(sop);
1da177e4
LT		 3054 }
3055out:
3056 nfs4_unlock_state();
3057 return status;
3058}
3059
3060static inline struct nfs4_client_reclaim *
a55370a3 3061alloc_reclaim(void)
1da177e4 3062{
a55370a3 3063 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3064}
3065
c7b9a459
N		 3066int
3067nfs4_has_reclaimed_state(const char *name)
3068{
3069 unsigned int strhashval = clientstr_hashval(name);
3070 struct nfs4_client *clp;
3071
3072 clp = find_confirmed_client_by_str(name, strhashval);
3073 return clp ? 1 : 0;
3074}
3075
1da177e4
LT		 3076/*
3077 * failure => all reset bets are off, nfserr_no_grace...
3078 */
190e4fbf
N		 3079int
3080nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3081{
3082 unsigned int strhashval;
3083 struct nfs4_client_reclaim *crp = NULL;
3084
a55370a3
N		 3085 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3086 crp = alloc_reclaim();
1da177e4
LT		 3087 if (!crp)
3088 return 0;
a55370a3 3089 strhashval = clientstr_hashval(name);
1da177e4
LT		 3090 INIT_LIST_HEAD(&crp->cr_strhash);
3091 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3092 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3093 reclaim_str_hashtbl_size++;
3094 return 1;
3095}
3096
3097static void
3098nfs4_release_reclaim(void)
3099{
3100 struct nfs4_client_reclaim *crp = NULL;
3101 int i;
3102
1da177e4
LT		 3103 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3104 while (!list_empty(&reclaim_str_hashtbl[i])) {
3105 crp = list_entry(reclaim_str_hashtbl[i].next,
3106 struct nfs4_client_reclaim, cr_strhash);
3107 list_del(&crp->cr_strhash);
1da177e4
LT		 3108 kfree(crp);
3109 reclaim_str_hashtbl_size--;
3110 }
3111 }
3112 BUG_ON(reclaim_str_hashtbl_size);
3113}
3114
3115/*
3116 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3117static struct nfs4_client_reclaim *
1da177e4
LT		 3118nfs4_find_reclaim_client(clientid_t *clid)
3119{
3120 unsigned int strhashval;
3121 struct nfs4_client *clp;
3122 struct nfs4_client_reclaim *crp = NULL;
3123
3124
3125 /* find clientid in conf_id_hashtbl */
3126 clp = find_confirmed_client(clid);
3127 if (clp == NULL)
3128 return NULL;
3129
a55370a3
N		 3130 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3131 clp->cl_name.len, clp->cl_name.data,
3132 clp->cl_recdir);
1da177e4
LT		 3133
3134 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3135 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3136 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3137 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3138 return crp;
3139 }
3140 }
3141 return NULL;
3142}
3143
3144/*
3145* Called from OPEN. Look for clientid in reclaim list.
3146*/
b37ad28b 3147__be32
1da177e4
LT		 3148nfs4_check_open_reclaim(clientid_t *clid)
3149{
dfc83565 3150 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3151}
3152
ac4d8ff2 3153/* initialization to perform at module load time: */
1da177e4 3154
ac4d8ff2
N		 3155void
3156nfs4_state_init(void)
1da177e4
LT		 3157{
3158 int i;
1da177e4 3159
1da177e4
LT		 3160 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3161 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3162 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3163 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3164 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3165 }
3166 for (i = 0; i < FILE_HASH_SIZE; i++) {
3167 INIT_LIST_HEAD(&file_hashtbl[i]);
3168 }
3169 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3170 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3171 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3172 }
3173 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3174 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3175 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3176 }
3177 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3178 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3179 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3180 }
1da177e4 3181 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3182 INIT_LIST_HEAD(&close_lru);
3183 INIT_LIST_HEAD(&client_lru);
3184 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3185 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3186 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3187 reclaim_str_hashtbl_size = 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();
9a8db97e 3238 grace_time = get_nfs_grace_period();
d99a05ad 3239 lease_time = user_lease_time;
a76b4319 3240 in_grace = 1;
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
3248int
76a3550e 3249nfs4_state_start(void)
1da177e4
LT		 3250{
3251 int status;
3252
3253 if (nfs4_init)
3254 return 0;
3255 status = nfsd4_init_slabs();
3256 if (status)
3257 return status;
190e4fbf 3258 nfsd4_load_reboot_recovery_data();
76a3550e 3259 __nfs4_state_start();
1da177e4
LT		 3260 nfs4_init = 1;
3261 return 0;
3262}
3263
3264int
3265nfs4_in_grace(void)
3266{
a76b4319 3267 return in_grace;
1da177e4
LT		 3268}
3269
3270time_t
3271nfs4_lease_time(void)
3272{
3273 return lease_time;
3274}
3275
3276static void
3277__nfs4_state_shutdown(void)
3278{
3279 int i;
3280 struct nfs4_client *clp = NULL;
3281 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3282 struct list_head *pos, *next, reaplist;
3283
1da177e4
LT		 3284 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3285 while (!list_empty(&conf_id_hashtbl[i])) {
3286 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3287 expire_client(clp);
3288 }
3289 while (!list_empty(&unconf_str_hashtbl[i])) {
3290 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3291 expire_client(clp);
3292 }
3293 }
3294 INIT_LIST_HEAD(&reaplist);
3295 spin_lock(&recall_lock);
3296 list_for_each_safe(pos, next, &del_recall_lru) {
3297 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3298 list_move(&dp->dl_recall_lru, &reaplist);
3299 }
3300 spin_unlock(&recall_lock);
3301 list_for_each_safe(pos, next, &reaplist) {
3302 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3303 list_del_init(&dp->dl_recall_lru);
3304 unhash_delegation(dp);
3305 }
3306
190e4fbf 3307 nfsd4_shutdown_recdir();
1da177e4 3308 nfs4_init = 0;
1da177e4
LT		 3309}
3310
3311void
3312nfs4_state_shutdown(void)
3313{
5e8d5c29
N		 3314 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3315 destroy_workqueue(laundry_wq);
1da177e4
LT		 3316 nfs4_lock_state();
3317 nfs4_release_reclaim();
3318 __nfs4_state_shutdown();
3319 nfsd4_free_slabs();
3320 nfs4_unlock_state();
3321}
3322
0964a3d3
N		 3323static void
3324nfs4_set_recdir(char *recdir)
3325{
3326 nfs4_lock_state();
3327 strcpy(user_recovery_dirname, recdir);
3328 nfs4_unlock_state();
3329}
3330
3331/*
3332 * Change the NFSv4 recovery directory to recdir.
3333 */
3334int
3335nfs4_reset_recoverydir(char *recdir)
3336{
3337 int status;
3338 struct nameidata nd;
3339
3340 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3341 if (status)
3342 return status;
3343 status = -ENOTDIR;
3344 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3345 nfs4_set_recdir(recdir);
3346 status = 0;
3347 }
3348 path_release(&nd);
3349 return status;
3350}
3351
1da177e4
LT		 3352/*
3353 * Called when leasetime is changed.
3354 *
d99a05ad
N		 3355 * The only way the protocol gives us to handle on-the-fly lease changes is to
3356 * simulate a reboot. Instead of doing that, we just wait till the next time
3357 * we start to register any changes in lease time. If the administrator
3358 * really wants to change the lease time *now*, they can go ahead and bring
3359 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3360 */
3361void
3362nfs4_reset_lease(time_t leasetime)
3363{
d99a05ad
N		 3364 lock_kernel();
3365 user_lease_time = leasetime;
3366 unlock_kernel();
1da177e4 3367}
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