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nfsd: eliminate final bogus case from setclientid logic
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
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
1b1a9b31
BF		 361static void
362shutdown_callback_client(struct nfs4_client *clp)
363{
364 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
365
366 /* shutdown rpc client, ending any outstanding recall rpcs */
367 if (clnt) {
368 clp->cl_callback.cb_client = NULL;
369 rpc_shutdown_client(clnt);
370 }
371}
372
1da177e4
LT		 373static inline void
374free_client(struct nfs4_client *clp)
375{
1b1a9b31 376 shutdown_callback_client(clp);
1da177e4
LT		 377 if (clp->cl_cred.cr_group_info)
378 put_group_info(clp->cl_cred.cr_group_info);
379 kfree(clp->cl_name.data);
380 kfree(clp);
381}
382
383void
384put_nfs4_client(struct nfs4_client *clp)
385{
386 if (atomic_dec_and_test(&clp->cl_count))
387 free_client(clp);
388}
389
390static void
391expire_client(struct nfs4_client *clp)
392{
393 struct nfs4_stateowner *sop;
394 struct nfs4_delegation *dp;
1da177e4
LT		 395 struct list_head reaplist;
396
397 dprintk("NFSD: expire_client cl_count %d\n",
398 atomic_read(&clp->cl_count));
399
1da177e4
LT		 400 INIT_LIST_HEAD(&reaplist);
401 spin_lock(&recall_lock);
ea1da636
N		 402 while (!list_empty(&clp->cl_delegations)) {
403 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 404 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
405 dp->dl_flock);
ea1da636 406 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 407 list_move(&dp->dl_recall_lru, &reaplist);
408 }
409 spin_unlock(&recall_lock);
410 while (!list_empty(&reaplist)) {
411 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
412 list_del_init(&dp->dl_recall_lru);
413 unhash_delegation(dp);
414 }
415 list_del(&clp->cl_idhash);
416 list_del(&clp->cl_strhash);
417 list_del(&clp->cl_lru);
ea1da636
N		 418 while (!list_empty(&clp->cl_openowners)) {
419 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 420 release_stateowner(sop);
421 }
422 put_nfs4_client(clp);
423}
424
425static struct nfs4_client *
a55370a3 426create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 427 struct nfs4_client *clp;
428
429 if (!(clp = alloc_client(name)))
430 goto out;
a55370a3 431 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 432 atomic_set(&clp->cl_count, 1);
433 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 434 INIT_LIST_HEAD(&clp->cl_idhash);
435 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 436 INIT_LIST_HEAD(&clp->cl_openowners);
437 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 438 INIT_LIST_HEAD(&clp->cl_lru);
439out:
440 return clp;
441}
442
443static void
444copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
445 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
446}
447
448static void
449copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
450 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
451 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
452}
453
454static void
455copy_cred(struct svc_cred *target, struct svc_cred *source) {
456
457 target->cr_uid = source->cr_uid;
458 target->cr_gid = source->cr_gid;
459 target->cr_group_info = source->cr_group_info;
460 get_group_info(target->cr_group_info);
461}
462
a55370a3 463static inline int
599e0a22
BF		 464same_name(const char *n1, const char *n2)
465{
a55370a3 466 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 467}
468
469static int
599e0a22
BF		 470same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
471{
472 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 473}
474
475static int
599e0a22
BF		 476same_clid(clientid_t *cl1, clientid_t *cl2)
477{
478 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 479}
480
481/* XXX what about NGROUP */
482static int
599e0a22
BF		 483same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
484{
485 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 486}
487
488static void
489gen_clid(struct nfs4_client *clp) {
490 clp->cl_clientid.cl_boot = boot_time;
491 clp->cl_clientid.cl_id = current_clientid++;
492}
493
494static void
495gen_confirm(struct nfs4_client *clp) {
496 struct timespec tv;
497 u32 * p;
498
499 tv = CURRENT_TIME;
500 p = (u32 *)clp->cl_confirm.data;
501 *p++ = tv.tv_sec;
502 *p++ = tv.tv_nsec;
503}
504
505static int
506check_name(struct xdr_netobj name) {
507
508 if (name.len == 0)
509 return 0;
510 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 511 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 512 return 0;
513 }
514 return 1;
515}
516
fd39ca9a 517static void
1da177e4
LT		 518add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
519{
520 unsigned int idhashval;
521
522 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
523 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
524 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
525 list_add_tail(&clp->cl_lru, &client_lru);
526 clp->cl_time = get_seconds();
527}
528
fd39ca9a 529static void
1da177e4
LT		 530move_to_confirmed(struct nfs4_client *clp)
531{
532 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
533 unsigned int strhashval;
534
535 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
536 list_del_init(&clp->cl_strhash);
f116629d 537 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 538 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 539 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
540 renew_client(clp);
541}
542
543static struct nfs4_client *
544find_confirmed_client(clientid_t *clid)
545{
546 struct nfs4_client *clp;
547 unsigned int idhashval = clientid_hashval(clid->cl_id);
548
549 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 550 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 551 return clp;
552 }
553 return NULL;
554}
555
556static struct nfs4_client *
557find_unconfirmed_client(clientid_t *clid)
558{
559 struct nfs4_client *clp;
560 unsigned int idhashval = clientid_hashval(clid->cl_id);
561
562 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 563 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 564 return clp;
565 }
566 return NULL;
567}
568
28ce6054
N		 569static struct nfs4_client *
570find_confirmed_client_by_str(const char *dname, unsigned int hashval)
571{
572 struct nfs4_client *clp;
573
574 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
575 if (same_name(clp->cl_recdir, dname))
576 return clp;
577 }
578 return NULL;
579}
580
581static struct nfs4_client *
582find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
583{
584 struct nfs4_client *clp;
585
586 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
587 if (same_name(clp->cl_recdir, dname))
588 return clp;
589 }
590 return NULL;
591}
592
1da177e4
LT		 593/* a helper function for parse_callback */
594static int
595parse_octet(unsigned int *lenp, char **addrp)
596{
597 unsigned int len = *lenp;
598 char *p = *addrp;
599 int n = -1;
600 char c;
601
602 for (;;) {
603 if (!len)
604 break;
605 len--;
606 c = *p++;
607 if (c == '.')
608 break;
609 if ((c < '0') || (c > '9')) {
610 n = -1;
611 break;
612 }
613 if (n < 0)
614 n = 0;
615 n = (n * 10) + (c - '0');
616 if (n > 255) {
617 n = -1;
618 break;
619 }
620 }
621 *lenp = len;
622 *addrp = p;
623 return n;
624}
625
626/* parse and set the setclientid ipv4 callback address */
fd39ca9a 627static int
1da177e4
LT		 628parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
629{
630 int temp = 0;
631 u32 cbaddr = 0;
632 u16 cbport = 0;
633 u32 addrlen = addr_len;
634 char *addr = addr_val;
635 int i, shift;
636
637 /* ipaddress */
638 shift = 24;
639 for(i = 4; i > 0 ; i--) {
640 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
641 return 0;
642 }
643 cbaddr |= (temp << shift);
644 if (shift > 0)
645 shift -= 8;
646 }
647 *cbaddrp = cbaddr;
648
649 /* port */
650 shift = 8;
651 for(i = 2; i > 0 ; i--) {
652 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
653 return 0;
654 }
655 cbport |= (temp << shift);
656 if (shift > 0)
657 shift -= 8;
658 }
659 *cbportp = cbport;
660 return 1;
661}
662
fd39ca9a 663static void
1da177e4
LT		 664gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
665{
666 struct nfs4_callback *cb = &clp->cl_callback;
667
668 /* Currently, we only support tcp for the callback channel */
669 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
670 goto out_err;
671
672 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
673 &cb->cb_addr, &cb->cb_port)))
674 goto out_err;
675 cb->cb_prog = se->se_callback_prog;
676 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 677 return;
678out_err:
849823c5 679 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 680 "will not receive delegations\n",
681 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
682
1da177e4
LT		 683 return;
684}
685
b37ad28b 686__be32
b591480b
BF		 687nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
688 struct nfsd4_setclientid *setclid)
1da177e4 689{
27459f09 690 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 691 struct xdr_netobj clname = {
692 .len = setclid->se_namelen,
693 .data = setclid->se_name,
694 };
695 nfs4_verifier clverifier = setclid->se_verf;
696 unsigned int strhashval;
28ce6054 697 struct nfs4_client *conf, *unconf, *new;
b37ad28b 698 __be32 status;
a55370a3 699 char dname[HEXDIR_LEN];
1da177e4 700
1da177e4 701 if (!check_name(clname))
73aea4ec 702 return nfserr_inval;
1da177e4 703
a55370a3
N		 704 status = nfs4_make_rec_clidname(dname, &clname);
705 if (status)
73aea4ec 706 return status;
a55370a3 707
1da177e4
LT		 708 /*
709 * XXX The Duplicate Request Cache (DRC) has been checked (??)
710 * We get here on a DRC miss.
711 */
712
a55370a3 713 strhashval = clientstr_hashval(dname);
1da177e4 714
1da177e4 715 nfs4_lock_state();
28ce6054
N		 716 conf = find_confirmed_client_by_str(dname, strhashval);
717 if (conf) {
a186e767 718 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 719 status = nfserr_clid_inuse;
599e0a22 720 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 721 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 722 dprintk("NFSD: setclientid: string in use by client"
723 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 724 goto out;
725 }
1da177e4 726 }
a186e767
BF		 727 /*
728 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
729 * has a description of SETCLIENTID request processing consisting
730 * of 5 bullet points, labeled as CASE0 - CASE4 below.
731 */
28ce6054 732 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 733 status = nfserr_resource;
734 if (!conf) {
a186e767
BF		 735 /*
736 * RFC 3530 14.2.33 CASE 4:
737 * placed first, because it is the normal case
1da177e4
LT		 738 */
739 if (unconf)
740 expire_client(unconf);
a55370a3
N		 741 new = create_client(clname, dname);
742 if (new == NULL)
1da177e4 743 goto out;
1da177e4 744 gen_clid(new);
599e0a22 745 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 746 /*
a186e767
BF		 747 * RFC 3530 14.2.33 CASE 1:
748 * probable callback update
1da177e4 749 */
31f4a6c1
N		 750 if (unconf) {
751 /* Note this is removing unconfirmed {*x***},
752 * which is stronger than RFC recommended {vxc**}.
753 * This has the advantage that there is at most
754 * one {*x***} in either list at any time.
755 */
756 expire_client(unconf);
1da177e4 757 }
a55370a3
N		 758 new = create_client(clname, dname);
759 if (new == NULL)
1da177e4 760 goto out;
1da177e4 761 copy_clid(new, conf);
1da177e4
LT		 762 } else if (!unconf) {
763 /*
a186e767
BF		 764 * RFC 3530 14.2.33 CASE 2:
765 * probable client reboot; state will be removed if
766 * confirmed.
1da177e4 767 */
a55370a3
N		 768 new = create_client(clname, dname);
769 if (new == NULL)
1da177e4 770 goto out;
1da177e4 771 gen_clid(new);
49ba8781 772 } else {
a186e767
BF		 773 /*
774 * RFC 3530 14.2.33 CASE 3:
775 * probable client reboot; state will be removed if
776 * confirmed.
1da177e4
LT		 777 */
778 expire_client(unconf);
a55370a3
N		 779 new = create_client(clname, dname);
780 if (new == NULL)
1da177e4 781 goto out;
1da177e4 782 gen_clid(new);
1da177e4 783 }
c175b83c
BF		 784 copy_verf(new, &clverifier);
785 new->cl_addr = sin->sin_addr.s_addr;
786 copy_cred(&new->cl_cred, &rqstp->rq_cred);
787 gen_confirm(new);
788 gen_callback(new, setclid);
789 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 790 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
791 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
792 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
793 status = nfs_ok;
794out:
795 nfs4_unlock_state();
796 return status;
797}
798
799
800/*
a186e767
BF		 801 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
802 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
803 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 804 */
b37ad28b 805__be32
b591480b
BF		 806nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
807 struct nfsd4_compound_state *cstate,
808 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 809{
27459f09 810 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 811 struct nfs4_client *conf, *unconf;
1da177e4
LT		 812 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
813 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 814 __be32 status;
1da177e4
LT		 815
816 if (STALE_CLIENTID(clid))
817 return nfserr_stale_clientid;
818 /*
819 * XXX The Duplicate Request Cache (DRC) has been checked (??)
820 * We get here on a DRC miss.
821 */
822
823 nfs4_lock_state();
21ab45a4
N		 824
825 conf = find_confirmed_client(clid);
826 unconf = find_unconfirmed_client(clid);
827
828 status = nfserr_clid_inuse;
27459f09 829 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 830 goto out;
27459f09 831 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 832 goto out;
833
a186e767
BF		 834 /*
835 * section 14.2.34 of RFC 3530 has a description of
836 * SETCLIENTID_CONFIRM request processing consisting
837 * of 4 bullet points, labeled as CASE1 - CASE4 below.
838 */
1da177e4 839 if ((conf && unconf) &&
599e0a22
BF		 840 (same_verf(&unconf->cl_confirm, &confirm)) &&
841 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 842 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
599e0a22 843 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
a186e767
BF		 844 /*
845 * RFC 3530 14.2.34 CASE 1:
846 * callback update
847 */
599e0a22 848 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 849 status = nfserr_clid_inuse;
850 else {
1a69c179
N		 851 /* XXX: We just turn off callbacks until we can handle
852 * change request correctly. */
cb36d634 853 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 854 gen_confirm(conf);
46309029 855 nfsd4_remove_clid_dir(unconf);
1a69c179 856 expire_client(unconf);
1da177e4 857 status = nfs_ok;
1a69c179 858
1da177e4 859 }
7c79f737 860 } else if ((conf && !unconf) ||
1da177e4 861 ((conf && unconf) &&
599e0a22 862 (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 863 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
a186e767
BF		 864 /*
865 * RFC 3530 14.2.34 CASE 2:
866 * probable retransmitted request; play it safe and
867 * do nothing.
7c79f737 868 */
599e0a22 869 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 870 status = nfserr_clid_inuse;
21ab45a4 871 else
1da177e4 872 status = nfs_ok;
7c79f737 873 } else if (!conf && unconf
599e0a22 874 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 875 /*
876 * RFC 3530 14.2.34 CASE 3:
877 * Normal case; new or rebooted client:
7c79f737 878 */
599e0a22 879 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 880 status = nfserr_clid_inuse;
881 } else {
1a69c179
N		 882 unsigned int hash =
883 clientstr_hashval(unconf->cl_recdir);
884 conf = find_confirmed_client_by_str(unconf->cl_recdir,
885 hash);
886 if (conf) {
c7b9a459 887 nfsd4_remove_clid_dir(conf);
1a69c179
N		 888 expire_client(conf);
889 }
1da177e4 890 move_to_confirmed(unconf);
21ab45a4 891 conf = unconf;
46f8a64b 892 nfsd4_probe_callback(conf);
1a69c179 893 status = nfs_ok;
1da177e4 894 }
599e0a22
BF		 895 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
896 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 897 &confirm)))) {
a186e767
BF		 898 /*
899 * RFC 3530 14.2.34 CASE 4:
900 * Client probably hasn't noticed that we rebooted yet.
7c79f737 901 */
1da177e4 902 status = nfserr_stale_clientid;
7c79f737 903 } else {
08e8987c
N		 904 /* check that we have hit one of the cases...*/
905 status = nfserr_clid_inuse;
906 }
1da177e4 907out:
1da177e4
LT		 908 nfs4_unlock_state();
909 return status;
910}
911
1da177e4
LT		 912/* OPEN Share state helper functions */
913static inline struct nfs4_file *
914alloc_init_file(struct inode *ino)
915{
916 struct nfs4_file *fp;
917 unsigned int hashval = file_hashval(ino);
918
e60d4398
N		 919 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
920 if (fp) {
13cd2184 921 kref_init(&fp->fi_ref);
1da177e4 922 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 923 INIT_LIST_HEAD(&fp->fi_stateids);
924 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 925 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
926 fp->fi_inode = igrab(ino);
927 fp->fi_id = current_fileid++;
47f9940c 928 fp->fi_had_conflict = false;
1da177e4
LT		 929 return fp;
930 }
931 return NULL;
932}
933
e60d4398 934static void
e18b890b 935nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 936{
e60d4398
N		 937 if (*slab == NULL)
938 return;
1a1d92c1 939 kmem_cache_destroy(*slab);
e60d4398 940 *slab = NULL;
1da177e4
LT		 941}
942
e8ff2a84 943void
1da177e4
LT		 944nfsd4_free_slabs(void)
945{
e60d4398
N		 946 nfsd4_free_slab(&stateowner_slab);
947 nfsd4_free_slab(&file_slab);
5ac049ac 948 nfsd4_free_slab(&stateid_slab);
5b2d21c1 949 nfsd4_free_slab(&deleg_slab);
e60d4398 950}
1da177e4 951
e60d4398
N		 952static int
953nfsd4_init_slabs(void)
954{
955 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 956 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 957 if (stateowner_slab == NULL)
958 goto out_nomem;
959 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 960 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 961 if (file_slab == NULL)
962 goto out_nomem;
5ac049ac 963 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 964 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 965 if (stateid_slab == NULL)
966 goto out_nomem;
5b2d21c1 967 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 968 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 969 if (deleg_slab == NULL)
970 goto out_nomem;
e60d4398
N		 971 return 0;
972out_nomem:
973 nfsd4_free_slabs();
974 dprintk("nfsd4: out of memory while initializing nfsv4\n");
975 return -ENOMEM;
1da177e4
LT		 976}
977
978void
979nfs4_free_stateowner(struct kref *kref)
980{
981 struct nfs4_stateowner *sop =
982 container_of(kref, struct nfs4_stateowner, so_ref);
983 kfree(sop->so_owner.data);
984 kmem_cache_free(stateowner_slab, sop);
985}
986
987static inline struct nfs4_stateowner *
988alloc_stateowner(struct xdr_netobj *owner)
989{
990 struct nfs4_stateowner *sop;
991
992 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
993 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
994 memcpy(sop->so_owner.data, owner->data, owner->len);
995 sop->so_owner.len = owner->len;
996 kref_init(&sop->so_ref);
997 return sop;
998 }
999 kmem_cache_free(stateowner_slab, sop);
1000 }
1001 return NULL;
1002}
1003
1004static struct nfs4_stateowner *
1005alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1006 struct nfs4_stateowner *sop;
1007 struct nfs4_replay *rp;
1008 unsigned int idhashval;
1009
1010 if (!(sop = alloc_stateowner(&open->op_owner)))
1011 return NULL;
1012 idhashval = ownerid_hashval(current_ownerid);
1013 INIT_LIST_HEAD(&sop->so_idhash);
1014 INIT_LIST_HEAD(&sop->so_strhash);
1015 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1016 INIT_LIST_HEAD(&sop->so_stateids);
1017 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1018 INIT_LIST_HEAD(&sop->so_close_lru);
1019 sop->so_time = 0;
1020 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1021 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1022 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1023 sop->so_is_open_owner = 1;
1024 sop->so_id = current_ownerid++;
1025 sop->so_client = clp;
1026 sop->so_seqid = open->op_seqid;
1027 sop->so_confirmed = 0;
1028 rp = &sop->so_replay;
de1ae286 1029 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1030 rp->rp_buflen = 0;
1031 rp->rp_buf = rp->rp_ibuf;
1032 return sop;
1033}
1034
1035static void
1036release_stateid_lockowners(struct nfs4_stateid *open_stp)
1037{
1038 struct nfs4_stateowner *lock_sop;
1039
ea1da636
N		 1040 while (!list_empty(&open_stp->st_lockowners)) {
1041 lock_sop = list_entry(open_stp->st_lockowners.next,
1042 struct nfs4_stateowner, so_perstateid);
1043 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1044 BUG_ON(lock_sop->so_is_open_owner);
1045 release_stateowner(lock_sop);
1046 }
1047}
1048
1049static void
1050unhash_stateowner(struct nfs4_stateowner *sop)
1051{
1052 struct nfs4_stateid *stp;
1053
1054 list_del(&sop->so_idhash);
1055 list_del(&sop->so_strhash);
6fa305de 1056 if (sop->so_is_open_owner)
1da177e4 1057 list_del(&sop->so_perclient);
ea1da636
N		 1058 list_del(&sop->so_perstateid);
1059 while (!list_empty(&sop->so_stateids)) {
1060 stp = list_entry(sop->so_stateids.next,
1061 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1062 if (sop->so_is_open_owner)
1063 release_stateid(stp, OPEN_STATE);
1064 else
1065 release_stateid(stp, LOCK_STATE);
1066 }
1067}
1068
1069static void
1070release_stateowner(struct nfs4_stateowner *sop)
1071{
1072 unhash_stateowner(sop);
1073 list_del(&sop->so_close_lru);
1074 nfs4_put_stateowner(sop);
1075}
1076
1077static inline void
1078init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1079 struct nfs4_stateowner *sop = open->op_stateowner;
1080 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1081
1082 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1083 INIT_LIST_HEAD(&stp->st_perstateowner);
1084 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1085 INIT_LIST_HEAD(&stp->st_perfile);
1086 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1087 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1088 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1089 stp->st_stateowner = sop;
13cd2184 1090 get_nfs4_file(fp);
1da177e4
LT		 1091 stp->st_file = fp;
1092 stp->st_stateid.si_boot = boot_time;
1093 stp->st_stateid.si_stateownerid = sop->so_id;
1094 stp->st_stateid.si_fileid = fp->fi_id;
1095 stp->st_stateid.si_generation = 0;
1096 stp->st_access_bmap = 0;
1097 stp->st_deny_bmap = 0;
1098 __set_bit(open->op_share_access, &stp->st_access_bmap);
1099 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1100 stp->st_openstp = NULL;
1da177e4
LT		 1101}
1102
1103static void
1104release_stateid(struct nfs4_stateid *stp, int flags)
1105{
1106 struct file *filp = stp->st_vfs_file;
1107
1108 list_del(&stp->st_hash);
1da177e4 1109 list_del(&stp->st_perfile);
ea1da636 1110 list_del(&stp->st_perstateowner);
1da177e4
LT		 1111 if (flags & OPEN_STATE) {
1112 release_stateid_lockowners(stp);
1113 stp->st_vfs_file = NULL;
1114 nfsd_close(filp);
1da177e4
LT		 1115 } else if (flags & LOCK_STATE)
1116 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1117 put_nfs4_file(stp->st_file);
5ac049ac 1118 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1119}
1120
fd39ca9a 1121static void
1da177e4
LT		 1122move_to_close_lru(struct nfs4_stateowner *sop)
1123{
1124 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1125
358dd55a 1126 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1127 sop->so_time = get_seconds();
1128}
1129
1da177e4 1130static int
599e0a22
BF		 1131same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1132 clientid_t *clid)
1133{
1134 return (sop->so_owner.len == owner->len) &&
1135 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1136 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1137}
1138
1139static struct nfs4_stateowner *
1140find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1141{
1142 struct nfs4_stateowner *so = NULL;
1143
1144 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1145 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1146 return so;
1147 }
1148 return NULL;
1149}
1150
1151/* search file_hashtbl[] for file */
1152static struct nfs4_file *
1153find_file(struct inode *ino)
1154{
1155 unsigned int hashval = file_hashval(ino);
1156 struct nfs4_file *fp;
1157
1158 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1159 if (fp->fi_inode == ino) {
1160 get_nfs4_file(fp);
1da177e4 1161 return fp;
13cd2184 1162 }
1da177e4
LT		 1163 }
1164 return NULL;
1165}
1166
ba5a6a19
BF		 1167static int access_valid(u32 x)
1168{
1169 return (x > 0 && x < 4);
1170}
1171
1172static int deny_valid(u32 x)
1173{
1174 return (x >= 0 && x < 5);
1175}
1da177e4 1176
fd39ca9a 1177static void
1da177e4
LT		 1178set_access(unsigned int *access, unsigned long bmap) {
1179 int i;
1180
1181 *access = 0;
1182 for (i = 1; i < 4; i++) {
1183 if (test_bit(i, &bmap))
1184 *access |= i;
1185 }
1186}
1187
fd39ca9a 1188static void
1da177e4
LT		 1189set_deny(unsigned int *deny, unsigned long bmap) {
1190 int i;
1191
1192 *deny = 0;
1193 for (i = 0; i < 4; i++) {
1194 if (test_bit(i, &bmap))
1195 *deny |= i ;
1196 }
1197}
1198
1199static int
1200test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1201 unsigned int access, deny;
1202
1203 set_access(&access, stp->st_access_bmap);
1204 set_deny(&deny, stp->st_deny_bmap);
1205 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1206 return 0;
1207 return 1;
1208}
1209
1210/*
1211 * Called to check deny when READ with all zero stateid or
1212 * WRITE with all zero or all one stateid
1213 */
b37ad28b 1214static __be32
1da177e4
LT		 1215nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1216{
1217 struct inode *ino = current_fh->fh_dentry->d_inode;
1218 struct nfs4_file *fp;
1219 struct nfs4_stateid *stp;
b37ad28b 1220 __be32 ret;
1da177e4
LT		 1221
1222 dprintk("NFSD: nfs4_share_conflict\n");
1223
1224 fp = find_file(ino);
13cd2184
N		 1225 if (!fp)
1226 return nfs_ok;
b700949b 1227 ret = nfserr_locked;
1da177e4 1228 /* Search for conflicting share reservations */
13cd2184
N		 1229 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1230 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1231 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1232 goto out;
1da177e4 1233 }
13cd2184
N		 1234 ret = nfs_ok;
1235out:
1236 put_nfs4_file(fp);
1237 return ret;
1da177e4
LT		 1238}
1239
1240static inline void
1241nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1242{
1243 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1244 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1245 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1246 }
1247}
1248
1249/*
1250 * Recall a delegation
1251 */
1252static int
1253do_recall(void *__dp)
1254{
1255 struct nfs4_delegation *dp = __dp;
1256
47f9940c 1257 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1258 nfsd4_cb_recall(dp);
1259 return 0;
1260}
1261
1262/*
1263 * Spawn a thread to perform a recall on the delegation represented
1264 * by the lease (file_lock)
1265 *
1266 * Called from break_lease() with lock_kernel() held.
1267 * Note: we assume break_lease will only call this *once* for any given
1268 * lease.
1269 */
1270static
1271void nfsd_break_deleg_cb(struct file_lock *fl)
1272{
1273 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1274 struct task_struct *t;
1275
1276 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1277 if (!dp)
1278 return;
1279
1280 /* We're assuming the state code never drops its reference
1281 * without first removing the lease. Since we're in this lease
1282 * callback (and since the lease code is serialized by the kernel
1283 * lock) we know the server hasn't removed the lease yet, we know
1284 * it's safe to take a reference: */
1285 atomic_inc(&dp->dl_count);
cfdcad4d 1286 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1287
1288 spin_lock(&recall_lock);
1289 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1290 spin_unlock(&recall_lock);
1291
1292 /* only place dl_time is set. protected by lock_kernel*/
1293 dp->dl_time = get_seconds();
1294
0272e1fd
BF		 1295 /*
1296 * We don't want the locks code to timeout the lease for us;
1297 * we'll remove it ourself if the delegation isn't returned
1298 * in time.
1299 */
1300 fl->fl_break_time = 0;
1da177e4
LT		 1301
1302 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1303 if (IS_ERR(t)) {
1304 struct nfs4_client *clp = dp->dl_client;
1305
1306 printk(KERN_INFO "NFSD: Callback thread failed for "
1307 "for client (clientid %08x/%08x)\n",
1308 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1309 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1310 nfs4_put_delegation(dp);
1311 }
1312}
1313
1314/*
1315 * The file_lock is being reapd.
1316 *
1317 * Called by locks_free_lock() with lock_kernel() held.
1318 */
1319static
1320void nfsd_release_deleg_cb(struct file_lock *fl)
1321{
1322 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1323
1324 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1325
1326 if (!(fl->fl_flags & FL_LEASE) || !dp)
1327 return;
1328 dp->dl_flock = NULL;
1329}
1330
1331/*
1332 * Set the delegation file_lock back pointer.
1333 *
a9933cea 1334 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1335 */
1336static
1337void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1338{
1339 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1340
1341 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1342 if (!dp)
1343 return;
1344 dp->dl_flock = new;
1345}
1346
1347/*
a9933cea 1348 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1349 */
1350static
1351int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1352{
1353 struct nfs4_delegation *onlistd =
1354 (struct nfs4_delegation *)onlist->fl_owner;
1355 struct nfs4_delegation *tryd =
1356 (struct nfs4_delegation *)try->fl_owner;
1357
1358 if (onlist->fl_lmops != try->fl_lmops)
1359 return 0;
1360
1361 return onlistd->dl_client == tryd->dl_client;
1362}
1363
1364
1365static
1366int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1367{
1368 if (arg & F_UNLCK)
1369 return lease_modify(onlist, arg);
1370 else
1371 return -EAGAIN;
1372}
1373
fd39ca9a 1374static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1375 .fl_break = nfsd_break_deleg_cb,
1376 .fl_release_private = nfsd_release_deleg_cb,
1377 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1378 .fl_mylease = nfsd_same_client_deleg_cb,
1379 .fl_change = nfsd_change_deleg_cb,
1380};
1381
1382
b37ad28b 1383__be32
1da177e4
LT		 1384nfsd4_process_open1(struct nfsd4_open *open)
1385{
1da177e4
LT		 1386 clientid_t *clientid = &open->op_clientid;
1387 struct nfs4_client *clp = NULL;
1388 unsigned int strhashval;
1389 struct nfs4_stateowner *sop = NULL;
1390
1da177e4 1391 if (!check_name(open->op_owner))
0f442aa2 1392 return nfserr_inval;
1da177e4
LT		 1393
1394 if (STALE_CLIENTID(&open->op_clientid))
1395 return nfserr_stale_clientid;
1396
1397 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1398 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1399 open->op_stateowner = sop;
1400 if (!sop) {
1401 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1402 clp = find_confirmed_client(clientid);
1403 if (clp == NULL)
0f442aa2
BF		 1404 return nfserr_expired;
1405 goto renew;
1da177e4 1406 }
0f442aa2
BF		 1407 if (!sop->so_confirmed) {
1408 /* Replace unconfirmed owners without checking for replay. */
1409 clp = sop->so_client;
1410 release_stateowner(sop);
1411 open->op_stateowner = NULL;
1412 goto renew;
1413 }
1414 if (open->op_seqid == sop->so_seqid - 1) {
1415 if (sop->so_replay.rp_buflen)
a90b061c 1416 return nfserr_replay_me;
0f442aa2
BF		 1417 /* The original OPEN failed so spectacularly
1418 * that we don't even have replay data saved!
1419 * Therefore, we have no choice but to continue
1420 * processing this OPEN; presumably, we'll
1421 * fail again for the same reason.
1422 */
1423 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1424 goto renew;
1425 }
1426 if (open->op_seqid != sop->so_seqid)
1427 return nfserr_bad_seqid;
1da177e4 1428renew:
0f442aa2
BF		 1429 if (open->op_stateowner == NULL) {
1430 sop = alloc_init_open_stateowner(strhashval, clp, open);
1431 if (sop == NULL)
1432 return nfserr_resource;
1433 open->op_stateowner = sop;
1434 }
1435 list_del_init(&sop->so_close_lru);
1da177e4 1436 renew_client(sop->so_client);
0f442aa2 1437 return nfs_ok;
1da177e4
LT		 1438}
1439
b37ad28b 1440static inline __be32
4a6e43e6
N		 1441nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1442{
1443 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1444 return nfserr_openmode;
1445 else
1446 return nfs_ok;
1447}
1448
52f4fb43
N		 1449static struct nfs4_delegation *
1450find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1451{
1452 struct nfs4_delegation *dp;
1453
ea1da636 1454 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1455 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1456 return dp;
1457 }
1458 return NULL;
1459}
1460
b37ad28b 1461static __be32
567d9829
N		 1462nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1463 struct nfs4_delegation **dp)
1464{
1465 int flags;
b37ad28b 1466 __be32 status = nfserr_bad_stateid;
567d9829
N		 1467
1468 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1469 if (*dp == NULL)
c44c5eeb 1470 goto out;
567d9829
N		 1471 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1472 RD_STATE : WR_STATE;
1473 status = nfs4_check_delegmode(*dp, flags);
1474 if (status)
1475 *dp = NULL;
c44c5eeb
N		 1476out:
1477 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1478 return nfs_ok;
1479 if (status)
1480 return status;
1481 open->op_stateowner->so_confirmed = 1;
1482 return nfs_ok;
567d9829
N		 1483}
1484
b37ad28b 1485static __be32
1da177e4
LT		 1486nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1487{
1488 struct nfs4_stateid *local;
b37ad28b 1489 __be32 status = nfserr_share_denied;
1da177e4
LT		 1490 struct nfs4_stateowner *sop = open->op_stateowner;
1491
8beefa24 1492 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1493 /* ignore lock owners */
1494 if (local->st_stateowner->so_is_open_owner == 0)
1495 continue;
1496 /* remember if we have seen this open owner */
1497 if (local->st_stateowner == sop)
1498 *stpp = local;
1499 /* check for conflicting share reservations */
1500 if (!test_share(local, open))
1501 goto out;
1502 }
1503 status = 0;
1504out:
1505 return status;
1506}
1507
5ac049ac
N		 1508static inline struct nfs4_stateid *
1509nfs4_alloc_stateid(void)
1510{
1511 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1512}
1513
b37ad28b 1514static __be32
1da177e4 1515nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1516 struct nfs4_delegation *dp,
1da177e4
LT		 1517 struct svc_fh *cur_fh, int flags)
1518{
1519 struct nfs4_stateid *stp;
1da177e4 1520
5ac049ac 1521 stp = nfs4_alloc_stateid();
1da177e4
LT		 1522 if (stp == NULL)
1523 return nfserr_resource;
1524
567d9829
N		 1525 if (dp) {
1526 get_file(dp->dl_vfs_file);
1527 stp->st_vfs_file = dp->dl_vfs_file;
1528 } else {
b37ad28b 1529 __be32 status;
567d9829
N		 1530 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1531 &stp->st_vfs_file);
1532 if (status) {
1533 if (status == nfserr_dropit)
1534 status = nfserr_jukebox;
5ac049ac 1535 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1536 return status;
1537 }
1da177e4 1538 }
1da177e4
LT		 1539 *stpp = stp;
1540 return 0;
1541}
1542
b37ad28b 1543static inline __be32
1da177e4
LT		 1544nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1545 struct nfsd4_open *open)
1546{
1547 struct iattr iattr = {
1548 .ia_valid = ATTR_SIZE,
1549 .ia_size = 0,
1550 };
1551 if (!open->op_truncate)
1552 return 0;
1553 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1554 return nfserr_inval;
1da177e4
LT		 1555 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1556}
1557
b37ad28b 1558static __be32
1da177e4
LT		 1559nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1560{
1561 struct file *filp = stp->st_vfs_file;
7eaa36e2 1562 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1563 unsigned int share_access, new_writer;
b37ad28b 1564 __be32 status;
1da177e4
LT		 1565
1566 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1567 new_writer = (~share_access) & open->op_share_access
1568 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1569
6c26d08f 1570 if (new_writer) {
b37ad28b
AV		 1571 int err = get_write_access(inode);
1572 if (err)
1573 return nfserrno(err);
6c26d08f 1574 }
1da177e4
LT		 1575 status = nfsd4_truncate(rqstp, cur_fh, open);
1576 if (status) {
6c26d08f
BF		 1577 if (new_writer)
1578 put_write_access(inode);
1da177e4
LT		 1579 return status;
1580 }
1581 /* remember the open */
6c26d08f 1582 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1583 set_bit(open->op_share_access, &stp->st_access_bmap);
1584 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1585
1586 return nfs_ok;
1587}
1588
1589
1da177e4 1590static void
37515177 1591nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1592{
37515177
N		 1593 open->op_stateowner->so_confirmed = 1;
1594 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1595}
1596
1597/*
1598 * Attempt to hand out a delegation.
1599 */
1600static void
1601nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1602{
1603 struct nfs4_delegation *dp;
1604 struct nfs4_stateowner *sop = stp->st_stateowner;
1605 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1606 struct file_lock fl, *flp = &fl;
1607 int status, flag = 0;
1608
1609 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1610 open->op_recall = 0;
1611 switch (open->op_claim_type) {
1612 case NFS4_OPEN_CLAIM_PREVIOUS:
1613 if (!atomic_read(&cb->cb_set))
1614 open->op_recall = 1;
1615 flag = open->op_delegate_type;
1616 if (flag == NFS4_OPEN_DELEGATE_NONE)
1617 goto out;
1618 break;
1619 case NFS4_OPEN_CLAIM_NULL:
1620 /* Let's not give out any delegations till everyone's
1621 * had the chance to reclaim theirs.... */
1622 if (nfs4_in_grace())
1623 goto out;
1624 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1625 goto out;
1626 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1627 flag = NFS4_OPEN_DELEGATE_WRITE;
1628 else
1629 flag = NFS4_OPEN_DELEGATE_READ;
1630 break;
1631 default:
1632 goto out;
1633 }
1da177e4
LT		 1634
1635 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1636 if (dp == NULL) {
1637 flag = NFS4_OPEN_DELEGATE_NONE;
1638 goto out;
1639 }
1640 locks_init_lock(&fl);
1641 fl.fl_lmops = &nfsd_lease_mng_ops;
1642 fl.fl_flags = FL_LEASE;
1643 fl.fl_end = OFFSET_MAX;
1644 fl.fl_owner = (fl_owner_t)dp;
1645 fl.fl_file = stp->st_vfs_file;
1646 fl.fl_pid = current->tgid;
1647
a9933cea 1648 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1649 * the lock_manager callbacks fl_mylease and fl_change are used
1650 */
a9933cea 1651 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1652 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1653 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1654 unhash_delegation(dp);
1da177e4
LT		 1655 flag = NFS4_OPEN_DELEGATE_NONE;
1656 goto out;
1657 }
1658
1659 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1660
1661 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1662 dp->dl_stateid.si_boot,
1663 dp->dl_stateid.si_stateownerid,
1664 dp->dl_stateid.si_fileid,
1665 dp->dl_stateid.si_generation);
1666out:
7b190fec
N		 1667 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1668 && flag == NFS4_OPEN_DELEGATE_NONE
1669 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1670 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1671 open->op_delegate_type = flag;
1672}
1673
1674/*
1675 * called with nfs4_lock_state() held.
1676 */
b37ad28b 1677__be32
1da177e4
LT		 1678nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1679{
1680 struct nfs4_file *fp = NULL;
1681 struct inode *ino = current_fh->fh_dentry->d_inode;
1682 struct nfs4_stateid *stp = NULL;
567d9829 1683 struct nfs4_delegation *dp = NULL;
b37ad28b 1684 __be32 status;
1da177e4
LT		 1685
1686 status = nfserr_inval;
ba5a6a19
BF		 1687 if (!access_valid(open->op_share_access)
1688 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1689 goto out;
1690 /*
1691 * Lookup file; if found, lookup stateid and check open request,
1692 * and check for delegations in the process of being recalled.
1693 * If not found, create the nfs4_file struct
1694 */
1695 fp = find_file(ino);
1696 if (fp) {
1697 if ((status = nfs4_check_open(fp, open, &stp)))
1698 goto out;
c44c5eeb
N		 1699 status = nfs4_check_deleg(fp, open, &dp);
1700 if (status)
1701 goto out;
1da177e4 1702 } else {
c44c5eeb
N		 1703 status = nfserr_bad_stateid;
1704 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1705 goto out;
1da177e4
LT		 1706 status = nfserr_resource;
1707 fp = alloc_init_file(ino);
1708 if (fp == NULL)
1709 goto out;
1710 }
1711
1712 /*
1713 * OPEN the file, or upgrade an existing OPEN.
1714 * If truncate fails, the OPEN fails.
1715 */
1716 if (stp) {
1717 /* Stateid was found, this is an OPEN upgrade */
1718 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1719 if (status)
1720 goto out;
444c2c07 1721 update_stateid(&stp->st_stateid);
1da177e4
LT		 1722 } else {
1723 /* Stateid was not found, this is a new OPEN */
1724 int flags = 0;
9ecb6a08
BF		 1725 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1726 flags |= MAY_READ;
1da177e4 1727 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1728 flags |= MAY_WRITE;
567d9829
N		 1729 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1730 if (status)
1da177e4
LT		 1731 goto out;
1732 init_stateid(stp, fp, open);
1733 status = nfsd4_truncate(rqstp, current_fh, open);
1734 if (status) {
1735 release_stateid(stp, OPEN_STATE);
1736 goto out;
1737 }
1738 }
1739 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1740
1741 /*
1742 * Attempt to hand out a delegation. No error return, because the
1743 * OPEN succeeds even if we fail.
1744 */
1745 nfs4_open_delegation(current_fh, open, stp);
1746
1747 status = nfs_ok;
1748
1749 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1750 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1751 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1752out:
13cd2184
N		 1753 if (fp)
1754 put_nfs4_file(fp);
37515177
N		 1755 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1756 nfs4_set_claim_prev(open);
1da177e4
LT		 1757 /*
1758 * To finish the open response, we just need to set the rflags.
1759 */
1760 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1761 if (!open->op_stateowner->so_confirmed)
1762 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1763
1764 return status;
1765}
1766
58da282b 1767static struct workqueue_struct *laundry_wq;
c4028958
DH		 1768static void laundromat_main(struct work_struct *);
1769static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1770
b37ad28b 1771__be32
b591480b
BF		 1772nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1773 clientid_t *clid)
1da177e4
LT		 1774{
1775 struct nfs4_client *clp;
b37ad28b 1776 __be32 status;
1da177e4
LT		 1777
1778 nfs4_lock_state();
1779 dprintk("process_renew(%08x/%08x): starting\n",
1780 clid->cl_boot, clid->cl_id);
1781 status = nfserr_stale_clientid;
1782 if (STALE_CLIENTID(clid))
1783 goto out;
1784 clp = find_confirmed_client(clid);
1785 status = nfserr_expired;
1786 if (clp == NULL) {
1787 /* We assume the client took too long to RENEW. */
1788 dprintk("nfsd4_renew: clientid not found!\n");
1789 goto out;
1790 }
1791 renew_client(clp);
1792 status = nfserr_cb_path_down;
ea1da636 1793 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1794 && !atomic_read(&clp->cl_callback.cb_set))
1795 goto out;
1796 status = nfs_ok;
1797out:
1798 nfs4_unlock_state();
1799 return status;
1800}
1801
a76b4319
N		 1802static void
1803end_grace(void)
1804{
1805 dprintk("NFSD: end of grace period\n");
c7b9a459 1806 nfsd4_recdir_purge_old();
a76b4319
N		 1807 in_grace = 0;
1808}
1809
fd39ca9a 1810static time_t
1da177e4
LT		 1811nfs4_laundromat(void)
1812{
1813 struct nfs4_client *clp;
1814 struct nfs4_stateowner *sop;
1815 struct nfs4_delegation *dp;
1816 struct list_head *pos, *next, reaplist;
1817 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1818 time_t t, clientid_val = NFSD_LEASE_TIME;
1819 time_t u, test_val = NFSD_LEASE_TIME;
1820
1821 nfs4_lock_state();
1822
1823 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1824 if (in_grace)
1825 end_grace();
1da177e4
LT		 1826 list_for_each_safe(pos, next, &client_lru) {
1827 clp = list_entry(pos, struct nfs4_client, cl_lru);
1828 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1829 t = clp->cl_time - cutoff;
1830 if (clientid_val > t)
1831 clientid_val = t;
1832 break;
1833 }
1834 dprintk("NFSD: purging unused client (clientid %08x)\n",
1835 clp->cl_clientid.cl_id);
c7b9a459 1836 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1837 expire_client(clp);
1838 }
1839 INIT_LIST_HEAD(&reaplist);
1840 spin_lock(&recall_lock);
1841 list_for_each_safe(pos, next, &del_recall_lru) {
1842 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1843 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1844 u = dp->dl_time - cutoff;
1845 if (test_val > u)
1846 test_val = u;
1847 break;
1848 }
1849 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1850 dp, dp->dl_flock);
1851 list_move(&dp->dl_recall_lru, &reaplist);
1852 }
1853 spin_unlock(&recall_lock);
1854 list_for_each_safe(pos, next, &reaplist) {
1855 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1856 list_del_init(&dp->dl_recall_lru);
1857 unhash_delegation(dp);
1858 }
1859 test_val = NFSD_LEASE_TIME;
1860 list_for_each_safe(pos, next, &close_lru) {
1861 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1862 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1863 u = sop->so_time - cutoff;
1864 if (test_val > u)
1865 test_val = u;
1866 break;
1867 }
1868 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1869 sop->so_id);
358dd55a 1870 release_stateowner(sop);
1da177e4
LT		 1871 }
1872 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1873 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1874 nfs4_unlock_state();
1875 return clientid_val;
1876}
1877
1878void
c4028958 1879laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1880{
1881 time_t t;
1882
1883 t = nfs4_laundromat();
1884 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1885 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1886}
1887
fd39ca9a 1888static struct nfs4_stateowner *
f8816512
N		 1889search_close_lru(u32 st_id, int flags)
1890{
1da177e4
LT		 1891 struct nfs4_stateowner *local = NULL;
1892
1da177e4
LT		 1893 if (flags & CLOSE_STATE) {
1894 list_for_each_entry(local, &close_lru, so_close_lru) {
1895 if (local->so_id == st_id)
1896 return local;
1897 }
1898 }
1899 return NULL;
1900}
1901
1902static inline int
1903nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1904{
7eaa36e2 1905 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1906}
1907
1908static int
1909STALE_STATEID(stateid_t *stateid)
1910{
1911 if (stateid->si_boot == boot_time)
1912 return 0;
849823c5 1913 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1914 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1915 stateid->si_generation);
1916 return 1;
1917}
1918
1919static inline int
1920access_permit_read(unsigned long access_bmap)
1921{
1922 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1923 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1924 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1925}
1926
1927static inline int
1928access_permit_write(unsigned long access_bmap)
1929{
1930 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1931 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1932}
1933
1934static
b37ad28b 1935__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1936{
b37ad28b 1937 __be32 status = nfserr_openmode;
1da177e4
LT		 1938
1939 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1940 goto out;
1941 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1942 goto out;
1943 status = nfs_ok;
1944out:
1945 return status;
1946}
1947
b37ad28b 1948static inline __be32
1da177e4
LT		 1949check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1950{
1951 /* Trying to call delegreturn with a special stateid? Yuch: */
1952 if (!(flags & (RD_STATE | WR_STATE)))
1953 return nfserr_bad_stateid;
1954 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1955 return nfs_ok;
1956 else if (nfs4_in_grace()) {
1957 /* Answer in remaining cases depends on existance of
1958 * conflicting state; so we must wait out the grace period. */
1959 return nfserr_grace;
1960 } else if (flags & WR_STATE)
1961 return nfs4_share_conflict(current_fh,
1962 NFS4_SHARE_DENY_WRITE);
1963 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1964 return nfs4_share_conflict(current_fh,
1965 NFS4_SHARE_DENY_READ);
1966}
1967
1968/*
1969 * Allow READ/WRITE during grace period on recovered state only for files
1970 * that are not able to provide mandatory locking.
1971 */
1972static inline int
1973io_during_grace_disallowed(struct inode *inode, int flags)
1974{
1975 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 1976 && mandatory_lock(inode);
1da177e4
LT		 1977}
1978
1979/*
1980* Checks for stateid operations
1981*/
b37ad28b 1982__be32
1da177e4
LT		 1983nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1984{
1985 struct nfs4_stateid *stp = NULL;
1986 struct nfs4_delegation *dp = NULL;
1987 stateid_t *stidp;
1988 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 1989 __be32 status;
1da177e4
LT		 1990
1991 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1992 stateid->si_boot, stateid->si_stateownerid,
1993 stateid->si_fileid, stateid->si_generation);
1994 if (filpp)
1995 *filpp = NULL;
1996
1997 if (io_during_grace_disallowed(ino, flags))
1998 return nfserr_grace;
1999
2000 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2001 return check_special_stateids(current_fh, stateid, flags);
2002
2003 /* STALE STATEID */
2004 status = nfserr_stale_stateid;
2005 if (STALE_STATEID(stateid))
2006 goto out;
2007
2008 /* BAD STATEID */
2009 status = nfserr_bad_stateid;
2010 if (!stateid->si_fileid) { /* delegation stateid */
2011 if(!(dp = find_delegation_stateid(ino, stateid))) {
2012 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2013 goto out;
2014 }
2015 stidp = &dp->dl_stateid;
2016 } else { /* open or lock stateid */
2017 if (!(stp = find_stateid(stateid, flags))) {
2018 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2019 goto out;
2020 }
2021 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2022 goto out;
2023 if (!stp->st_stateowner->so_confirmed)
2024 goto out;
2025 stidp = &stp->st_stateid;
2026 }
2027 if (stateid->si_generation > stidp->si_generation)
2028 goto out;
2029
2030 /* OLD STATEID */
2031 status = nfserr_old_stateid;
2032 if (stateid->si_generation < stidp->si_generation)
2033 goto out;
2034 if (stp) {
2035 if ((status = nfs4_check_openmode(stp,flags)))
2036 goto out;
2037 renew_client(stp->st_stateowner->so_client);
2038 if (filpp)
2039 *filpp = stp->st_vfs_file;
2040 } else if (dp) {
2041 if ((status = nfs4_check_delegmode(dp, flags)))
2042 goto out;
2043 renew_client(dp->dl_client);
2044 if (flags & DELEG_RET)
2045 unhash_delegation(dp);
2046 if (filpp)
2047 *filpp = dp->dl_vfs_file;
2048 }
2049 status = nfs_ok;
2050out:
2051 return status;
2052}
2053
4c4cd222
N		 2054static inline int
2055setlkflg (int type)
2056{
2057 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2058 RD_STATE : WR_STATE;
2059}
1da177e4
LT		 2060
2061/*
2062 * Checks for sequence id mutating operations.
2063 */
b37ad28b 2064static __be32
4c4cd222 2065nfs4_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 2066{
1da177e4
LT		 2067 struct nfs4_stateid *stp;
2068 struct nfs4_stateowner *sop;
2069
2070 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2071 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2072 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2073 stateid->si_generation);
3a4f98bb 2074
1da177e4
LT		 2075 *stpp = NULL;
2076 *sopp = NULL;
2077
1da177e4 2078 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2079 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2080 return nfserr_bad_stateid;
1da177e4
LT		 2081 }
2082
1da177e4 2083 if (STALE_STATEID(stateid))
3a4f98bb 2084 return nfserr_stale_stateid;
1da177e4
LT		 2085 /*
2086 * We return BAD_STATEID if filehandle doesn't match stateid,
2087 * the confirmed flag is incorrecly set, or the generation
2088 * number is incorrect.
1da177e4 2089 */
f8816512
N		 2090 stp = find_stateid(stateid, flags);
2091 if (stp == NULL) {
2092 /*
2093 * Also, we should make sure this isn't just the result of
2094 * a replayed close:
2095 */
2096 sop = search_close_lru(stateid->si_stateownerid, flags);
2097 if (sop == NULL)
2098 return nfserr_bad_stateid;
2099 *sopp = sop;
2100 goto check_replay;
2101 }
1da177e4 2102
4c4cd222 2103 if (lock) {
1da177e4 2104 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2105 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2106 struct nfs4_client *clp = sop->so_client;
4c4cd222 2107 int lkflg = 0;
b37ad28b 2108 __be32 status;
4c4cd222
N		 2109
2110 lkflg = setlkflg(lock->lk_type);
2111
2112 if (lock->lk_is_new) {
599e0a22
BF		 2113 if (!sop->so_is_open_owner)
2114 return nfserr_bad_stateid;
2115 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2116 return nfserr_bad_stateid;
599e0a22
BF		 2117 /* stp is the open stateid */
2118 status = nfs4_check_openmode(stp, lkflg);
2119 if (status)
2120 return status;
2121 } else {
2122 /* stp is the lock stateid */
2123 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2124 if (status)
2125 return status;
4c4cd222 2126 }
1da177e4
LT		 2127 }
2128
2129 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2130 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2131 return nfserr_bad_stateid;
1da177e4
LT		 2132 }
2133
2134 *stpp = stp;
2135 *sopp = sop = stp->st_stateowner;
2136
2137 /*
2138 * We now validate the seqid and stateid generation numbers.
2139 * For the moment, we ignore the possibility of
2140 * generation number wraparound.
2141 */
bd9aac52 2142 if (seqid != sop->so_seqid)
1da177e4
LT		 2143 goto check_replay;
2144
3a4f98bb 2145 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2146 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2147 " unconfirmed stateowner!\n");
2148 return nfserr_bad_stateid;
1da177e4 2149 }
3a4f98bb 2150 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2151 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2152 " confirmed yet!\n");
2153 return nfserr_bad_stateid;
1da177e4
LT		 2154 }
2155 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2156 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2157 return nfserr_bad_stateid;
1da177e4
LT		 2158 }
2159
1da177e4 2160 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2161 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2162 return nfserr_old_stateid;
1da177e4 2163 }
52fd004e 2164 renew_client(sop->so_client);
3a4f98bb 2165 return nfs_ok;
1da177e4 2166
1da177e4 2167check_replay:
bd9aac52 2168 if (seqid == sop->so_seqid - 1) {
849823c5 2169 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2170 /* indicate replay to calling function */
a90b061c 2171 return nfserr_replay_me;
1da177e4 2172 }
2fdada03 2173 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2174 sop->so_seqid, seqid);
2175 *sopp = NULL;
2176 return nfserr_bad_seqid;
1da177e4
LT		 2177}
2178
b37ad28b 2179__be32
ca364317 2180nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2181 struct nfsd4_open_confirm *oc)
1da177e4 2182{
b37ad28b 2183 __be32 status;
1da177e4
LT		 2184 struct nfs4_stateowner *sop;
2185 struct nfs4_stateid *stp;
2186
2187 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2188 (int)cstate->current_fh.fh_dentry->d_name.len,
2189 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2190
ca364317 2191 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2192 if (status)
2193 return status;
1da177e4
LT		 2194
2195 nfs4_lock_state();
2196
ca364317
BF		 2197 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2198 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2199 CHECK_FH | CONFIRM | OPEN_STATE,
2200 &oc->oc_stateowner, &stp, NULL)))
2201 goto out;
2202
2203 sop = oc->oc_stateowner;
2204 sop->so_confirmed = 1;
2205 update_stateid(&stp->st_stateid);
2206 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2207 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2208 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2209 stp->st_stateid.si_boot,
2210 stp->st_stateid.si_stateownerid,
2211 stp->st_stateid.si_fileid,
2212 stp->st_stateid.si_generation);
c7b9a459
N		 2213
2214 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2215out:
f2327d9a 2216 if (oc->oc_stateowner) {
1da177e4 2217 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2218 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2219 }
1da177e4
LT		 2220 nfs4_unlock_state();
2221 return status;
2222}
2223
2224
2225/*
2226 * unset all bits in union bitmap (bmap) that
2227 * do not exist in share (from successful OPEN_DOWNGRADE)
2228 */
2229static void
2230reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2231{
2232 int i;
2233 for (i = 1; i < 4; i++) {
2234 if ((i & access) != i)
2235 __clear_bit(i, bmap);
2236 }
2237}
2238
2239static void
2240reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2241{
2242 int i;
2243 for (i = 0; i < 4; i++) {
2244 if ((i & deny) != i)
2245 __clear_bit(i, bmap);
2246 }
2247}
2248
b37ad28b 2249__be32
ca364317
BF		 2250nfsd4_open_downgrade(struct svc_rqst *rqstp,
2251 struct nfsd4_compound_state *cstate,
a4f1706a 2252 struct nfsd4_open_downgrade *od)
1da177e4 2253{
b37ad28b 2254 __be32 status;
1da177e4
LT		 2255 struct nfs4_stateid *stp;
2256 unsigned int share_access;
2257
2258 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2259 (int)cstate->current_fh.fh_dentry->d_name.len,
2260 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2261
ba5a6a19
BF		 2262 if (!access_valid(od->od_share_access)
2263 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2264 return nfserr_inval;
2265
2266 nfs4_lock_state();
ca364317
BF		 2267 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2268 od->od_seqid,
1da177e4
LT		 2269 &od->od_stateid,
2270 CHECK_FH | OPEN_STATE,
2271 &od->od_stateowner, &stp, NULL)))
2272 goto out;
2273
2274 status = nfserr_inval;
2275 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2276 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2277 stp->st_access_bmap, od->od_share_access);
2278 goto out;
2279 }
2280 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2281 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2282 stp->st_deny_bmap, od->od_share_deny);
2283 goto out;
2284 }
2285 set_access(&share_access, stp->st_access_bmap);
2286 nfs4_file_downgrade(stp->st_vfs_file,
2287 share_access & ~od->od_share_access);
2288
2289 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2290 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2291
2292 update_stateid(&stp->st_stateid);
2293 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2294 status = nfs_ok;
2295out:
f2327d9a 2296 if (od->od_stateowner) {
1da177e4 2297 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2298 cstate->replay_owner = od->od_stateowner;
f2327d9a 2299 }
1da177e4
LT		 2300 nfs4_unlock_state();
2301 return status;
2302}
2303
2304/*
2305 * nfs4_unlock_state() called after encode
2306 */
b37ad28b 2307__be32
ca364317 2308nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2309 struct nfsd4_close *close)
1da177e4 2310{
b37ad28b 2311 __be32 status;
1da177e4
LT		 2312 struct nfs4_stateid *stp;
2313
2314 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2315 (int)cstate->current_fh.fh_dentry->d_name.len,
2316 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2317
2318 nfs4_lock_state();
2319 /* check close_lru for replay */
ca364317
BF		 2320 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2321 close->cl_seqid,
1da177e4
LT		 2322 &close->cl_stateid,
2323 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2324 &close->cl_stateowner, &stp, NULL)))
2325 goto out;
1da177e4
LT		 2326 status = nfs_ok;
2327 update_stateid(&stp->st_stateid);
2328 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2329
04ef5954
BF		 2330 /* release_stateid() calls nfsd_close() if needed */
2331 release_stateid(stp, OPEN_STATE);
2332
2333 /* place unused nfs4_stateowners on so_close_lru list to be
2334 * released by the laundromat service after the lease period
2335 * to enable us to handle CLOSE replay
2336 */
2337 if (list_empty(&close->cl_stateowner->so_stateids))
2338 move_to_close_lru(close->cl_stateowner);
1da177e4 2339out:
f2327d9a 2340 if (close->cl_stateowner) {
1da177e4 2341 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2342 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2343 }
1da177e4
LT		 2344 nfs4_unlock_state();
2345 return status;
2346}
2347
b37ad28b 2348__be32
ca364317
BF		 2349nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2350 struct nfsd4_delegreturn *dr)
1da177e4 2351{
b37ad28b 2352 __be32 status;
1da177e4 2353
ca364317 2354 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2355 goto out;
2356
2357 nfs4_lock_state();
ca364317
BF		 2358 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2359 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2360 nfs4_unlock_state();
2361out:
2362 return status;
2363}
2364
2365
2366/*
2367 * Lock owner state (byte-range locks)
2368 */
2369#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2370#define LOCK_HASH_BITS 8
2371#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2372#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2373
2374#define lockownerid_hashval(id) \
2375 ((id) & LOCK_HASH_MASK)
2376
2377static inline unsigned int
2378lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2379 struct xdr_netobj *ownername)
2380{
2381 return (file_hashval(inode) + cl_id
2382 + opaque_hashval(ownername->data, ownername->len))
2383 & LOCK_HASH_MASK;
2384}
2385
2386static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2387static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2388static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2389
fd39ca9a 2390static struct nfs4_stateid *
1da177e4
LT		 2391find_stateid(stateid_t *stid, int flags)
2392{
2393 struct nfs4_stateid *local = NULL;
2394 u32 st_id = stid->si_stateownerid;
2395 u32 f_id = stid->si_fileid;
2396 unsigned int hashval;
2397
2398 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2399 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2400 hashval = stateid_hashval(st_id, f_id);
2401 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2402 if ((local->st_stateid.si_stateownerid == st_id) &&
2403 (local->st_stateid.si_fileid == f_id))
2404 return local;
2405 }
2406 }
2407 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2408 hashval = stateid_hashval(st_id, f_id);
2409 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2410 if ((local->st_stateid.si_stateownerid == st_id) &&
2411 (local->st_stateid.si_fileid == f_id))
2412 return local;
2413 }
849823c5 2414 }
1da177e4
LT		 2415 return NULL;
2416}
2417
2418static struct nfs4_delegation *
2419find_delegation_stateid(struct inode *ino, stateid_t *stid)
2420{
13cd2184
N		 2421 struct nfs4_file *fp;
2422 struct nfs4_delegation *dl;
1da177e4
LT		 2423
2424 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2425 stid->si_boot, stid->si_stateownerid,
2426 stid->si_fileid, stid->si_generation);
2427
1da177e4 2428 fp = find_file(ino);
13cd2184
N		 2429 if (!fp)
2430 return NULL;
2431 dl = find_delegation_file(fp, stid);
2432 put_nfs4_file(fp);
2433 return dl;
1da177e4
LT		 2434}
2435
2436/*
2437 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2438 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2439 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2440 * locking, this prevents us from being completely protocol-compliant. The
2441 * real solution to this problem is to start using unsigned file offsets in
2442 * the VFS, but this is a very deep change!
2443 */
2444static inline void
2445nfs4_transform_lock_offset(struct file_lock *lock)
2446{
2447 if (lock->fl_start < 0)
2448 lock->fl_start = OFFSET_MAX;
2449 if (lock->fl_end < 0)
2450 lock->fl_end = OFFSET_MAX;
2451}
2452
d5b9026a
N		 2453/* Hack!: For now, we're defining this just so we can use a pointer to it
2454 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2455static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2456};
1da177e4
LT		 2457
2458static inline void
2459nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2460{
d5b9026a
N		 2461 struct nfs4_stateowner *sop;
2462 unsigned int hval;
1da177e4 2463
d5b9026a
N		 2464 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2465 sop = (struct nfs4_stateowner *) fl->fl_owner;
2466 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2467 kref_get(&sop->so_ref);
2468 deny->ld_sop = sop;
2469 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2470 } else {
2471 deny->ld_sop = NULL;
2472 deny->ld_clientid.cl_boot = 0;
2473 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2474 }
2475 deny->ld_start = fl->fl_start;
2476 deny->ld_length = ~(u64)0;
2477 if (fl->fl_end != ~(u64)0)
2478 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2479 deny->ld_type = NFS4_READ_LT;
2480 if (fl->fl_type != F_RDLCK)
2481 deny->ld_type = NFS4_WRITE_LT;
2482}
2483
1da177e4
LT		 2484static struct nfs4_stateowner *
2485find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2486 struct xdr_netobj *owner)
2487{
2488 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2489 struct nfs4_stateowner *op;
2490
2491 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2492 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2493 return op;
2494 }
2495 return NULL;
2496}
2497
2498/*
2499 * Alloc a lock owner structure.
2500 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2501 * occured.
2502 *
2503 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2504 */
2505
2506static struct nfs4_stateowner *
2507alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2508 struct nfs4_stateowner *sop;
2509 struct nfs4_replay *rp;
2510 unsigned int idhashval;
2511
2512 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2513 return NULL;
2514 idhashval = lockownerid_hashval(current_ownerid);
2515 INIT_LIST_HEAD(&sop->so_idhash);
2516 INIT_LIST_HEAD(&sop->so_strhash);
2517 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2518 INIT_LIST_HEAD(&sop->so_stateids);
2519 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2520 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2521 sop->so_time = 0;
2522 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2523 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2524 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2525 sop->so_is_open_owner = 0;
2526 sop->so_id = current_ownerid++;
2527 sop->so_client = clp;
b59e3c0e
NB		 2528 /* It is the openowner seqid that will be incremented in encode in the
2529 * case of new lockowners; so increment the lock seqid manually: */
2530 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2531 sop->so_confirmed = 1;
2532 rp = &sop->so_replay;
de1ae286 2533 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2534 rp->rp_buflen = 0;
2535 rp->rp_buf = rp->rp_ibuf;
2536 return sop;
2537}
2538
fd39ca9a 2539static struct nfs4_stateid *
1da177e4
LT		 2540alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2541{
2542 struct nfs4_stateid *stp;
2543 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2544
5ac049ac
N		 2545 stp = nfs4_alloc_stateid();
2546 if (stp == NULL)
1da177e4
LT		 2547 goto out;
2548 INIT_LIST_HEAD(&stp->st_hash);
2549 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2550 INIT_LIST_HEAD(&stp->st_perstateowner);
2551 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2552 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2553 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2554 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2555 stp->st_stateowner = sop;
13cd2184 2556 get_nfs4_file(fp);
1da177e4
LT		 2557 stp->st_file = fp;
2558 stp->st_stateid.si_boot = boot_time;
2559 stp->st_stateid.si_stateownerid = sop->so_id;
2560 stp->st_stateid.si_fileid = fp->fi_id;
2561 stp->st_stateid.si_generation = 0;
2562 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2563 stp->st_access_bmap = open_stp->st_access_bmap;
2564 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2565 stp->st_openstp = open_stp;
1da177e4
LT		 2566
2567out:
2568 return stp;
2569}
2570
fd39ca9a 2571static int
1da177e4
LT		 2572check_lock_length(u64 offset, u64 length)
2573{
2574 return ((length == 0) || ((length != ~(u64)0) &&
2575 LOFF_OVERFLOW(offset, length)));
2576}
2577
2578/*
2579 * LOCK operation
2580 */
b37ad28b 2581__be32
ca364317 2582nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2583 struct nfsd4_lock *lock)
1da177e4 2584{
3e9e3dbe 2585 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2586 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2587 struct nfs4_stateid *lock_stp;
2588 struct file *filp;
2589 struct file_lock file_lock;
8dc7c311 2590 struct file_lock conflock;
b37ad28b 2591 __be32 status = 0;
1da177e4 2592 unsigned int strhashval;
150b3934 2593 unsigned int cmd;
b8dd7b9a 2594 int err;
1da177e4
LT		 2595
2596 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2597 (long long) lock->lk_offset,
2598 (long long) lock->lk_length);
2599
1da177e4
LT		 2600 if (check_lock_length(lock->lk_offset, lock->lk_length))
2601 return nfserr_inval;
2602
ca364317
BF		 2603 if ((status = fh_verify(rqstp, &cstate->current_fh,
2604 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2605 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2606 return status;
2607 }
2608
1da177e4
LT		 2609 nfs4_lock_state();
2610
2611 if (lock->lk_is_new) {
893f8770
N		 2612 /*
2613 * Client indicates that this is a new lockowner.
2614 * Use open owner and open stateid to create lock owner and
2615 * lock stateid.
2616 */
1da177e4
LT		 2617 struct nfs4_stateid *open_stp = NULL;
2618 struct nfs4_file *fp;
2619
2620 status = nfserr_stale_clientid;
849823c5 2621 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2622 goto out;
1da177e4 2623
1da177e4 2624 /* validate and update open stateid and open seqid */
ca364317 2625 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2626 lock->lk_new_open_seqid,
2627 &lock->lk_new_open_stateid,
2628 CHECK_FH | OPEN_STATE,
3a65588a 2629 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2630 lock);
37515177 2631 if (status)
1da177e4 2632 goto out;
3a65588a 2633 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2634 /* create lockowner and lock stateid */
2635 fp = open_stp->st_file;
2636 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2637 open_sop->so_client->cl_clientid.cl_id,
2638 &lock->v.new.owner);
3e9e3dbe
N		 2639 /* XXX: Do we need to check for duplicate stateowners on
2640 * the same file, or should they just be allowed (and
2641 * create new stateids)? */
1da177e4 2642 status = nfserr_resource;
b59e3c0e
NB		 2643 lock_sop = alloc_init_lock_stateowner(strhashval,
2644 open_sop->so_client, open_stp, lock);
2645 if (lock_sop == NULL)
1da177e4 2646 goto out;
b59e3c0e 2647 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2648 if (lock_stp == NULL)
1da177e4 2649 goto out;
1da177e4
LT		 2650 } else {
2651 /* lock (lock owner + lock stateid) already exists */
ca364317 2652 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2653 lock->lk_old_lock_seqid,
2654 &lock->lk_old_lock_stateid,
2655 CHECK_FH | LOCK_STATE,
3a65588a 2656 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2657 if (status)
2658 goto out;
3a65588a 2659 lock_sop = lock->lk_replay_owner;
1da177e4 2660 }
3a65588a 2661 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2662 filp = lock_stp->st_vfs_file;
2663
0dd395dc
N		 2664 status = nfserr_grace;
2665 if (nfs4_in_grace() && !lock->lk_reclaim)
2666 goto out;
2667 status = nfserr_no_grace;
2668 if (!nfs4_in_grace() && lock->lk_reclaim)
2669 goto out;
2670
1da177e4
LT		 2671 locks_init_lock(&file_lock);
2672 switch (lock->lk_type) {
2673 case NFS4_READ_LT:
2674 case NFS4_READW_LT:
2675 file_lock.fl_type = F_RDLCK;
150b3934 2676 cmd = F_SETLK;
1da177e4
LT		 2677 break;
2678 case NFS4_WRITE_LT:
2679 case NFS4_WRITEW_LT:
2680 file_lock.fl_type = F_WRLCK;
150b3934 2681 cmd = F_SETLK;
1da177e4
LT		 2682 break;
2683 default:
2684 status = nfserr_inval;
2685 goto out;
2686 }
b59e3c0e 2687 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2688 file_lock.fl_pid = current->tgid;
2689 file_lock.fl_file = filp;
2690 file_lock.fl_flags = FL_POSIX;
d5b9026a 2691 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2692
2693 file_lock.fl_start = lock->lk_offset;
2694 if ((lock->lk_length == ~(u64)0) ||
2695 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2696 file_lock.fl_end = ~(u64)0;
2697 else
2698 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2699 nfs4_transform_lock_offset(&file_lock);
2700
2701 /*
2702 * Try to lock the file in the VFS.
2703 * Note: locks.c uses the BKL to protect the inode's lock list.
2704 */
2705
eb76b3fd
AA		 2706 /* XXX?: Just to divert the locks_release_private at the start of
2707 * locks_copy_lock: */
150b3934 2708 locks_init_lock(&conflock);
fd85b817 2709 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2710 switch (-err) {
1da177e4
LT		 2711 case 0: /* success! */
2712 update_stateid(&lock_stp->st_stateid);
2713 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2714 sizeof(stateid_t));
b8dd7b9a 2715 status = 0;
eb76b3fd
AA		 2716 break;
2717 case (EAGAIN): /* conflock holds conflicting lock */
2718 status = nfserr_denied;
2719 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2720 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2721 break;
1da177e4
LT		 2722 case (EDEADLK):
2723 status = nfserr_deadlock;
eb76b3fd 2724 break;
1da177e4 2725 default:
fd85b817 2726 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2727 status = nfserr_resource;
2728 break;
1da177e4 2729 }
1da177e4 2730out:
8a280510
BF		 2731 if (status && lock->lk_is_new && lock_sop)
2732 release_stateowner(lock_sop);
3a65588a
BF		 2733 if (lock->lk_replay_owner) {
2734 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2735 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2736 }
1da177e4
LT		 2737 nfs4_unlock_state();
2738 return status;
2739}
2740
2741/*
2742 * LOCKT operation
2743 */
b37ad28b 2744__be32
ca364317
BF		 2745nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2746 struct nfsd4_lockt *lockt)
1da177e4
LT		 2747{
2748 struct inode *inode;
2749 struct file file;
2750 struct file_lock file_lock;
fd85b817 2751 int error;
b37ad28b 2752 __be32 status;
1da177e4
LT		 2753
2754 if (nfs4_in_grace())
2755 return nfserr_grace;
2756
2757 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2758 return nfserr_inval;
2759
2760 lockt->lt_stateowner = NULL;
2761 nfs4_lock_state();
2762
2763 status = nfserr_stale_clientid;
849823c5 2764 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2765 goto out;
1da177e4 2766
ca364317 2767 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2768 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2769 if (status == nfserr_symlink)
2770 status = nfserr_inval;
2771 goto out;
2772 }
2773
ca364317 2774 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2775 locks_init_lock(&file_lock);
2776 switch (lockt->lt_type) {
2777 case NFS4_READ_LT:
2778 case NFS4_READW_LT:
2779 file_lock.fl_type = F_RDLCK;
2780 break;
2781 case NFS4_WRITE_LT:
2782 case NFS4_WRITEW_LT:
2783 file_lock.fl_type = F_WRLCK;
2784 break;
2785 default:
2fdada03 2786 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2787 status = nfserr_inval;
2788 goto out;
2789 }
2790
2791 lockt->lt_stateowner = find_lockstateowner_str(inode,
2792 &lockt->lt_clientid, &lockt->lt_owner);
2793 if (lockt->lt_stateowner)
2794 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2795 file_lock.fl_pid = current->tgid;
2796 file_lock.fl_flags = FL_POSIX;
d5b9026a 2797 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2798
2799 file_lock.fl_start = lockt->lt_offset;
2800 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2801 file_lock.fl_end = ~(u64)0;
2802 else
2803 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2804
2805 nfs4_transform_lock_offset(&file_lock);
2806
fd85b817 2807 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2808 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2809 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2810 * only the dentry:inode set.
2811 */
2812 memset(&file, 0, sizeof (struct file));
ca364317 2813 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2814
2815 status = nfs_ok;
fd85b817
ME		 2816 error = vfs_test_lock(&file, &file_lock);
2817 if (error) {
2818 status = nfserrno(error);
2819 goto out;
2820 }
9d6a8c5c 2821 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2822 status = nfserr_denied;
9d6a8c5c 2823 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2824 }
2825out:
2826 nfs4_unlock_state();
2827 return status;
2828}
2829
b37ad28b 2830__be32
ca364317 2831nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2832 struct nfsd4_locku *locku)
1da177e4
LT		 2833{
2834 struct nfs4_stateid *stp;
2835 struct file *filp = NULL;
2836 struct file_lock file_lock;
b37ad28b 2837 __be32 status;
b8dd7b9a 2838 int err;
1da177e4
LT		 2839
2840 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2841 (long long) locku->lu_offset,
2842 (long long) locku->lu_length);
2843
2844 if (check_lock_length(locku->lu_offset, locku->lu_length))
2845 return nfserr_inval;
2846
2847 nfs4_lock_state();
2848
ca364317 2849 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2850 locku->lu_seqid,
2851 &locku->lu_stateid,
2852 CHECK_FH | LOCK_STATE,
2853 &locku->lu_stateowner, &stp, NULL)))
2854 goto out;
2855
2856 filp = stp->st_vfs_file;
2857 BUG_ON(!filp);
2858 locks_init_lock(&file_lock);
2859 file_lock.fl_type = F_UNLCK;
2860 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2861 file_lock.fl_pid = current->tgid;
2862 file_lock.fl_file = filp;
2863 file_lock.fl_flags = FL_POSIX;
d5b9026a 2864 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2865 file_lock.fl_start = locku->lu_offset;
2866
2867 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2868 file_lock.fl_end = ~(u64)0;
2869 else
2870 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2871 nfs4_transform_lock_offset(&file_lock);
2872
2873 /*
2874 * Try to unlock the file in the VFS.
2875 */
fd85b817 2876 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2877 if (err) {
fd85b817 2878 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2879 goto out_nfserr;
2880 }
2881 /*
2882 * OK, unlock succeeded; the only thing left to do is update the stateid.
2883 */
2884 update_stateid(&stp->st_stateid);
2885 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2886
2887out:
f2327d9a 2888 if (locku->lu_stateowner) {
1da177e4 2889 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2890 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2891 }
1da177e4
LT		 2892 nfs4_unlock_state();
2893 return status;
2894
2895out_nfserr:
b8dd7b9a 2896 status = nfserrno(err);
1da177e4
LT		 2897 goto out;
2898}
2899
2900/*
2901 * returns
2902 * 1: locks held by lockowner
2903 * 0: no locks held by lockowner
2904 */
2905static int
2906check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2907{
2908 struct file_lock **flpp;
7eaa36e2 2909 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2910 int status = 0;
2911
2912 lock_kernel();
2913 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2914 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2915 status = 1;
2916 goto out;
796dadfd 2917 }
1da177e4
LT		 2918 }
2919out:
2920 unlock_kernel();
2921 return status;
2922}
2923
b37ad28b 2924__be32
b591480b
BF		 2925nfsd4_release_lockowner(struct svc_rqst *rqstp,
2926 struct nfsd4_compound_state *cstate,
2927 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2928{
2929 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2930 struct nfs4_stateowner *sop;
2931 struct nfs4_stateid *stp;
1da177e4 2932 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2933 struct list_head matches;
2934 int i;
b37ad28b 2935 __be32 status;
1da177e4
LT		 2936
2937 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2938 clid->cl_boot, clid->cl_id);
2939
2940 /* XXX check for lease expiration */
2941
2942 status = nfserr_stale_clientid;
849823c5 2943 if (STALE_CLIENTID(clid))
1da177e4 2944 return status;
1da177e4
LT		 2945
2946 nfs4_lock_state();
2947
3e9e3dbe
N		 2948 status = nfserr_locks_held;
2949 /* XXX: we're doing a linear search through all the lockowners.
2950 * Yipes! For now we'll just hope clients aren't really using
2951 * release_lockowner much, but eventually we have to fix these
2952 * data structures. */
2953 INIT_LIST_HEAD(&matches);
2954 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2955 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2956 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2957 continue;
2958 list_for_each_entry(stp, &sop->so_stateids,
2959 st_perstateowner) {
2960 if (check_for_locks(stp->st_vfs_file, sop))
2961 goto out;
2962 /* Note: so_perclient unused for lockowners,
2963 * so it's OK to fool with here. */
2964 list_add(&sop->so_perclient, &matches);
2965 }
1da177e4 2966 }
3e9e3dbe
N		 2967 }
2968 /* Clients probably won't expect us to return with some (but not all)
2969 * of the lockowner state released; so don't release any until all
2970 * have been checked. */
2971 status = nfs_ok;
0fa822e4
N		 2972 while (!list_empty(&matches)) {
2973 sop = list_entry(matches.next, struct nfs4_stateowner,
2974 so_perclient);
2975 /* unhash_stateowner deletes so_perclient only
2976 * for openowners. */
2977 list_del(&sop->so_perclient);
3e9e3dbe 2978 release_stateowner(sop);
1da177e4
LT		 2979 }
2980out:
2981 nfs4_unlock_state();
2982 return status;
2983}
2984
2985static inline struct nfs4_client_reclaim *
a55370a3 2986alloc_reclaim(void)
1da177e4 2987{
a55370a3 2988 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 2989}
2990
c7b9a459
N		 2991int
2992nfs4_has_reclaimed_state(const char *name)
2993{
2994 unsigned int strhashval = clientstr_hashval(name);
2995 struct nfs4_client *clp;
2996
2997 clp = find_confirmed_client_by_str(name, strhashval);
2998 return clp ? 1 : 0;
2999}
3000
1da177e4
LT		 3001/*
3002 * failure => all reset bets are off, nfserr_no_grace...
3003 */
190e4fbf
N		 3004int
3005nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3006{
3007 unsigned int strhashval;
3008 struct nfs4_client_reclaim *crp = NULL;
3009
a55370a3
N		 3010 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3011 crp = alloc_reclaim();
1da177e4
LT		 3012 if (!crp)
3013 return 0;
a55370a3 3014 strhashval = clientstr_hashval(name);
1da177e4
LT		 3015 INIT_LIST_HEAD(&crp->cr_strhash);
3016 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3017 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3018 reclaim_str_hashtbl_size++;
3019 return 1;
3020}
3021
3022static void
3023nfs4_release_reclaim(void)
3024{
3025 struct nfs4_client_reclaim *crp = NULL;
3026 int i;
3027
1da177e4
LT		 3028 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3029 while (!list_empty(&reclaim_str_hashtbl[i])) {
3030 crp = list_entry(reclaim_str_hashtbl[i].next,
3031 struct nfs4_client_reclaim, cr_strhash);
3032 list_del(&crp->cr_strhash);
1da177e4
LT		 3033 kfree(crp);
3034 reclaim_str_hashtbl_size--;
3035 }
3036 }
3037 BUG_ON(reclaim_str_hashtbl_size);
3038}
3039
3040/*
3041 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3042static struct nfs4_client_reclaim *
1da177e4
LT		 3043nfs4_find_reclaim_client(clientid_t *clid)
3044{
3045 unsigned int strhashval;
3046 struct nfs4_client *clp;
3047 struct nfs4_client_reclaim *crp = NULL;
3048
3049
3050 /* find clientid in conf_id_hashtbl */
3051 clp = find_confirmed_client(clid);
3052 if (clp == NULL)
3053 return NULL;
3054
a55370a3
N		 3055 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3056 clp->cl_name.len, clp->cl_name.data,
3057 clp->cl_recdir);
1da177e4
LT		 3058
3059 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3060 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3061 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3062 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3063 return crp;
3064 }
3065 }
3066 return NULL;
3067}
3068
3069/*
3070* Called from OPEN. Look for clientid in reclaim list.
3071*/
b37ad28b 3072__be32
1da177e4
LT		 3073nfs4_check_open_reclaim(clientid_t *clid)
3074{
dfc83565 3075 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3076}
3077
ac4d8ff2 3078/* initialization to perform at module load time: */
1da177e4 3079
e8ff2a84 3080int
ac4d8ff2 3081nfs4_state_init(void)
1da177e4 3082{
e8ff2a84 3083 int i, status;
1da177e4 3084
e8ff2a84
BF		 3085 status = nfsd4_init_slabs();
3086 if (status)
3087 return status;
1da177e4
LT		 3088 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3089 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3090 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3091 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3092 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3093 }
3094 for (i = 0; i < FILE_HASH_SIZE; i++) {
3095 INIT_LIST_HEAD(&file_hashtbl[i]);
3096 }
3097 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3098 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3099 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3100 }
3101 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3102 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3103 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3104 }
3105 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3106 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3107 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3108 }
1da177e4 3109 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3110 INIT_LIST_HEAD(&close_lru);
3111 INIT_LIST_HEAD(&client_lru);
3112 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3113 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3114 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3115 reclaim_str_hashtbl_size = 0;
e8ff2a84 3116 return 0;
ac4d8ff2
N		 3117}
3118
190e4fbf
N		 3119static void
3120nfsd4_load_reboot_recovery_data(void)
3121{
3122 int status;
3123
0964a3d3
N		 3124 nfs4_lock_state();
3125 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3126 status = nfsd4_recdir_load();
0964a3d3 3127 nfs4_unlock_state();
190e4fbf
N		 3128 if (status)
3129 printk("NFSD: Failure reading reboot recovery data\n");
3130}
3131
9a8db97e
ME		 3132unsigned long
3133get_nfs4_grace_period(void)
3134{
3135 return max(user_lease_time, lease_time) * HZ;
3136}
3137
c2f1a551
MS		 3138/*
3139 * Since the lifetime of a delegation isn't limited to that of an open, a
3140 * client may quite reasonably hang on to a delegation as long as it has
3141 * the inode cached. This becomes an obvious problem the first time a
3142 * client's inode cache approaches the size of the server's total memory.
3143 *
3144 * For now we avoid this problem by imposing a hard limit on the number
3145 * of delegations, which varies according to the server's memory size.
3146 */
3147static void
3148set_max_delegations(void)
3149{
3150 /*
3151 * Allow at most 4 delegations per megabyte of RAM. Quick
3152 * estimates suggest that in the worst case (where every delegation
3153 * is for a different inode), a delegation could take about 1.5K,
3154 * giving a worst case usage of about 6% of memory.
3155 */
3156 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3157}
3158
ac4d8ff2
N		 3159/* initialization to perform when the nfsd service is started: */
3160
3161static void
3162__nfs4_state_start(void)
3163{
9a8db97e 3164 unsigned long grace_time;
ac4d8ff2 3165
1da177e4 3166 boot_time = get_seconds();
9a8db97e 3167 grace_time = get_nfs_grace_period();
d99a05ad 3168 lease_time = user_lease_time;
a76b4319 3169 in_grace = 1;
9a8db97e
ME		 3170 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3171 grace_time/HZ);
58da282b 3172 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3173 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3174 set_max_delegations();
1da177e4
LT		 3175}
3176
e8ff2a84 3177void
76a3550e 3178nfs4_state_start(void)
1da177e4 3179{
1da177e4 3180 if (nfs4_init)
e8ff2a84 3181 return;
190e4fbf 3182 nfsd4_load_reboot_recovery_data();
76a3550e 3183 __nfs4_state_start();
1da177e4 3184 nfs4_init = 1;
e8ff2a84 3185 return;
1da177e4
LT		 3186}
3187
3188int
3189nfs4_in_grace(void)
3190{
a76b4319 3191 return in_grace;
1da177e4
LT		 3192}
3193
3194time_t
3195nfs4_lease_time(void)
3196{
3197 return lease_time;
3198}
3199
3200static void
3201__nfs4_state_shutdown(void)
3202{
3203 int i;
3204 struct nfs4_client *clp = NULL;
3205 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3206 struct list_head *pos, *next, reaplist;
3207
1da177e4
LT		 3208 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3209 while (!list_empty(&conf_id_hashtbl[i])) {
3210 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3211 expire_client(clp);
3212 }
3213 while (!list_empty(&unconf_str_hashtbl[i])) {
3214 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3215 expire_client(clp);
3216 }
3217 }
3218 INIT_LIST_HEAD(&reaplist);
3219 spin_lock(&recall_lock);
3220 list_for_each_safe(pos, next, &del_recall_lru) {
3221 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3222 list_move(&dp->dl_recall_lru, &reaplist);
3223 }
3224 spin_unlock(&recall_lock);
3225 list_for_each_safe(pos, next, &reaplist) {
3226 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3227 list_del_init(&dp->dl_recall_lru);
3228 unhash_delegation(dp);
3229 }
3230
190e4fbf 3231 nfsd4_shutdown_recdir();
1da177e4 3232 nfs4_init = 0;
1da177e4
LT		 3233}
3234
3235void
3236nfs4_state_shutdown(void)
3237{
5e8d5c29
N		 3238 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3239 destroy_workqueue(laundry_wq);
1da177e4
LT		 3240 nfs4_lock_state();
3241 nfs4_release_reclaim();
3242 __nfs4_state_shutdown();
1da177e4
LT		 3243 nfs4_unlock_state();
3244}
3245
0964a3d3
N		 3246static void
3247nfs4_set_recdir(char *recdir)
3248{
3249 nfs4_lock_state();
3250 strcpy(user_recovery_dirname, recdir);
3251 nfs4_unlock_state();
3252}
3253
3254/*
3255 * Change the NFSv4 recovery directory to recdir.
3256 */
3257int
3258nfs4_reset_recoverydir(char *recdir)
3259{
3260 int status;
3261 struct nameidata nd;
3262
3263 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3264 if (status)
3265 return status;
3266 status = -ENOTDIR;
3267 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3268 nfs4_set_recdir(recdir);
3269 status = 0;
3270 }
3271 path_release(&nd);
3272 return status;
3273}
3274
1da177e4
LT		 3275/*
3276 * Called when leasetime is changed.
3277 *
d99a05ad
N		 3278 * The only way the protocol gives us to handle on-the-fly lease changes is to
3279 * simulate a reboot. Instead of doing that, we just wait till the next time
3280 * we start to register any changes in lease time. If the administrator
3281 * really wants to change the lease time *now*, they can go ahead and bring
3282 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3283 */
3284void
3285nfs4_reset_lease(time_t leasetime)
3286{
d99a05ad
N		 3287 lock_kernel();
3288 user_lease_time = leasetime;
3289 unlock_kernel();
1da177e4 3290}
Linux 6.x block layer and io_uring tree(s)