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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
[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
686/*
687 * RFC 3010 has a complex implmentation description of processing a
688 * SETCLIENTID request consisting of 5 bullets, labeled as
689 * CASE0 - CASE4 below.
690 *
691 * NOTES:
692 * callback information will be processed in a future patch
693 *
694 * an unconfirmed record is added when:
695 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
696 * CASE 1: confirmed record found with matching name, principal,
697 * verifier, and clientid.
698 * CASE 2: confirmed record found with matching name, principal,
699 * and there is no unconfirmed record with matching
700 * name and principal
701 *
702 * an unconfirmed record is replaced when:
703 * CASE 3: confirmed record found with matching name, principal,
704 * and an unconfirmed record is found with matching
705 * name, principal, and with clientid and
706 * confirm that does not match the confirmed record.
707 * CASE 4: there is no confirmed record with matching name and
708 * principal. there is an unconfirmed record with
709 * matching name, principal.
710 *
711 * an unconfirmed record is deleted when:
712 * CASE 1: an unconfirmed record that matches input name, verifier,
713 * and confirmed clientid.
714 * CASE 4: any unconfirmed records with matching name and principal
715 * that exist after an unconfirmed record has been replaced
716 * as described above.
717 *
718 */
b37ad28b 719__be32
b591480b
BF		 720nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
721 struct nfsd4_setclientid *setclid)
1da177e4 722{
27459f09 723 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 724 struct xdr_netobj clname = {
725 .len = setclid->se_namelen,
726 .data = setclid->se_name,
727 };
728 nfs4_verifier clverifier = setclid->se_verf;
729 unsigned int strhashval;
28ce6054 730 struct nfs4_client *conf, *unconf, *new;
b37ad28b 731 __be32 status;
a55370a3 732 char dname[HEXDIR_LEN];
1da177e4 733
1da177e4 734 if (!check_name(clname))
73aea4ec 735 return nfserr_inval;
1da177e4 736
a55370a3
N		 737 status = nfs4_make_rec_clidname(dname, &clname);
738 if (status)
73aea4ec 739 return status;
a55370a3 740
1da177e4
LT		 741 /*
742 * XXX The Duplicate Request Cache (DRC) has been checked (??)
743 * We get here on a DRC miss.
744 */
745
a55370a3 746 strhashval = clientstr_hashval(dname);
1da177e4 747
1da177e4 748 nfs4_lock_state();
28ce6054
N		 749 conf = find_confirmed_client_by_str(dname, strhashval);
750 if (conf) {
1da177e4
LT		 751 /*
752 * CASE 0:
753 * clname match, confirmed, different principal
754 * or different ip_address
755 */
756 status = nfserr_clid_inuse;
599e0a22 757 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 758 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 759 dprintk("NFSD: setclientid: string in use by client"
760 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 761 goto out;
762 }
1da177e4 763 }
28ce6054 764 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 765 status = nfserr_resource;
766 if (!conf) {
767 /*
768 * CASE 4:
769 * placed first, because it is the normal case.
770 */
771 if (unconf)
772 expire_client(unconf);
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4 775 goto out;
1da177e4 776 gen_clid(new);
599e0a22 777 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4
LT		 778 /*
779 * CASE 1:
780 * cl_name match, confirmed, principal match
781 * verifier match: probable callback update
782 *
783 * remove any unconfirmed nfs4_client with
784 * matching cl_name, cl_verifier, and cl_clientid
785 *
786 * create and insert an unconfirmed nfs4_client with same
787 * cl_name, cl_verifier, and cl_clientid as existing
788 * nfs4_client, but with the new callback info and a
789 * new cl_confirm
790 */
31f4a6c1
N		 791 if (unconf) {
792 /* Note this is removing unconfirmed {*x***},
793 * which is stronger than RFC recommended {vxc**}.
794 * This has the advantage that there is at most
795 * one {*x***} in either list at any time.
796 */
797 expire_client(unconf);
1da177e4 798 }
a55370a3
N		 799 new = create_client(clname, dname);
800 if (new == NULL)
1da177e4 801 goto out;
1da177e4 802 copy_clid(new, conf);
1da177e4
LT		 803 } else if (!unconf) {
804 /*
805 * CASE 2:
806 * clname match, confirmed, principal match
807 * verfier does not match
808 * no unconfirmed. create a new unconfirmed nfs4_client
809 * using input clverifier, clname, and callback info
810 * and generate a new cl_clientid and cl_confirm.
811 */
a55370a3
N		 812 new = create_client(clname, dname);
813 if (new == NULL)
1da177e4 814 goto out;
1da177e4 815 gen_clid(new);
599e0a22 816 } else if (!same_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
1da177e4
LT		 817 /*
818 * CASE3:
819 * confirmed found (name, principal match)
820 * confirmed verifier does not match input clverifier
821 *
822 * unconfirmed found (name match)
823 * confirmed->cl_confirm != unconfirmed->cl_confirm
824 *
825 * remove unconfirmed.
826 *
827 * create an unconfirmed nfs4_client
828 * with same cl_name as existing confirmed nfs4_client,
829 * but with new callback info, new cl_clientid,
830 * new cl_verifier and a new cl_confirm
831 */
832 expire_client(unconf);
a55370a3
N		 833 new = create_client(clname, dname);
834 if (new == NULL)
1da177e4 835 goto out;
1da177e4 836 gen_clid(new);
1da177e4
LT		 837 } else {
838 /* No cases hit !!! */
839 status = nfserr_inval;
840 goto out;
841
842 }
c175b83c
BF		 843 copy_verf(new, &clverifier);
844 new->cl_addr = sin->sin_addr.s_addr;
845 copy_cred(&new->cl_cred, &rqstp->rq_cred);
846 gen_confirm(new);
847 gen_callback(new, setclid);
848 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 849 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
850 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
851 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
852 status = nfs_ok;
853out:
854 nfs4_unlock_state();
855 return status;
856}
857
858
859/*
860 * RFC 3010 has a complex implmentation description of processing a
861 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
862 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
863 *
864 * NOTE: callback information will be processed here in a future patch
865 */
b37ad28b 866__be32
b591480b
BF		 867nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
868 struct nfsd4_compound_state *cstate,
869 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 870{
27459f09 871 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 872 struct nfs4_client *conf, *unconf;
1da177e4
LT		 873 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
874 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 875 __be32 status;
1da177e4
LT		 876
877 if (STALE_CLIENTID(clid))
878 return nfserr_stale_clientid;
879 /*
880 * XXX The Duplicate Request Cache (DRC) has been checked (??)
881 * We get here on a DRC miss.
882 */
883
884 nfs4_lock_state();
21ab45a4
N		 885
886 conf = find_confirmed_client(clid);
887 unconf = find_unconfirmed_client(clid);
888
889 status = nfserr_clid_inuse;
27459f09 890 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 891 goto out;
27459f09 892 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 893 goto out;
894
1da177e4 895 if ((conf && unconf) &&
599e0a22
BF		 896 (same_verf(&unconf->cl_confirm, &confirm)) &&
897 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 898 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
599e0a22 899 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 900 /* CASE 1:
901 * unconf record that matches input clientid and input confirm.
902 * conf record that matches input clientid.
903 * conf and unconf records match names, verifiers
904 */
599e0a22 905 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 906 status = nfserr_clid_inuse;
907 else {
1a69c179
N		 908 /* XXX: We just turn off callbacks until we can handle
909 * change request correctly. */
cb36d634 910 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 911 gen_confirm(conf);
46309029 912 nfsd4_remove_clid_dir(unconf);
1a69c179 913 expire_client(unconf);
1da177e4 914 status = nfs_ok;
1a69c179 915
1da177e4 916 }
7c79f737 917 } else if ((conf && !unconf) ||
1da177e4 918 ((conf && unconf) &&
599e0a22 919 (!same_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 920 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 921 /* CASE 2:
922 * conf record that matches input clientid.
923 * if unconf record matches input clientid, then
924 * unconf->cl_name or unconf->cl_verifier don't match the
925 * conf record.
926 */
599e0a22 927 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 928 status = nfserr_clid_inuse;
21ab45a4 929 else
1da177e4 930 status = nfs_ok;
7c79f737 931 } else if (!conf && unconf
599e0a22 932 && same_verf(&unconf->cl_confirm, &confirm)) {
7c79f737
N		 933 /* CASE 3:
934 * conf record not found.
935 * unconf record found.
936 * unconf->cl_confirm matches input confirm
937 */
599e0a22 938 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 939 status = nfserr_clid_inuse;
940 } else {
1a69c179
N		 941 unsigned int hash =
942 clientstr_hashval(unconf->cl_recdir);
943 conf = find_confirmed_client_by_str(unconf->cl_recdir,
944 hash);
945 if (conf) {
c7b9a459 946 nfsd4_remove_clid_dir(conf);
1a69c179
N		 947 expire_client(conf);
948 }
1da177e4 949 move_to_confirmed(unconf);
21ab45a4 950 conf = unconf;
1a69c179 951 status = nfs_ok;
1da177e4 952 }
599e0a22
BF		 953 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
954 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737
N		 955 &confirm)))) {
956 /* CASE 4:
957 * conf record not found, or if conf, conf->cl_confirm does not
958 * match input confirm.
959 * unconf record not found, or if unconf, unconf->cl_confirm
960 * does not match input confirm.
961 */
1da177e4 962 status = nfserr_stale_clientid;
7c79f737 963 } else {
08e8987c
N		 964 /* check that we have hit one of the cases...*/
965 status = nfserr_clid_inuse;
966 }
1da177e4
LT		 967out:
968 if (!status)
21ab45a4 969 nfsd4_probe_callback(conf);
1da177e4
LT		 970 nfs4_unlock_state();
971 return status;
972}
973
1da177e4
LT		 974/* OPEN Share state helper functions */
975static inline struct nfs4_file *
976alloc_init_file(struct inode *ino)
977{
978 struct nfs4_file *fp;
979 unsigned int hashval = file_hashval(ino);
980
e60d4398
N		 981 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
982 if (fp) {
13cd2184 983 kref_init(&fp->fi_ref);
1da177e4 984 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 985 INIT_LIST_HEAD(&fp->fi_stateids);
986 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 987 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
988 fp->fi_inode = igrab(ino);
989 fp->fi_id = current_fileid++;
47f9940c 990 fp->fi_had_conflict = false;
1da177e4
LT		 991 return fp;
992 }
993 return NULL;
994}
995
e60d4398 996static void
e18b890b 997nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 998{
e60d4398
N		 999 if (*slab == NULL)
1000 return;
1a1d92c1 1001 kmem_cache_destroy(*slab);
e60d4398 1002 *slab = NULL;
1da177e4
LT		 1003}
1004
e8ff2a84 1005void
1da177e4
LT		 1006nfsd4_free_slabs(void)
1007{
e60d4398
N		 1008 nfsd4_free_slab(&stateowner_slab);
1009 nfsd4_free_slab(&file_slab);
5ac049ac 1010 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1011 nfsd4_free_slab(&deleg_slab);
e60d4398 1012}
1da177e4 1013
e60d4398
N		 1014static int
1015nfsd4_init_slabs(void)
1016{
1017 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 1018 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 1019 if (stateowner_slab == NULL)
1020 goto out_nomem;
1021 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 1022 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 1023 if (file_slab == NULL)
1024 goto out_nomem;
5ac049ac 1025 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 1026 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 1027 if (stateid_slab == NULL)
1028 goto out_nomem;
5b2d21c1 1029 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 1030 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 1031 if (deleg_slab == NULL)
1032 goto out_nomem;
e60d4398
N		 1033 return 0;
1034out_nomem:
1035 nfsd4_free_slabs();
1036 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037 return -ENOMEM;
1da177e4
LT		 1038}
1039
1040void
1041nfs4_free_stateowner(struct kref *kref)
1042{
1043 struct nfs4_stateowner *sop =
1044 container_of(kref, struct nfs4_stateowner, so_ref);
1045 kfree(sop->so_owner.data);
1046 kmem_cache_free(stateowner_slab, sop);
1047}
1048
1049static inline struct nfs4_stateowner *
1050alloc_stateowner(struct xdr_netobj *owner)
1051{
1052 struct nfs4_stateowner *sop;
1053
1054 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056 memcpy(sop->so_owner.data, owner->data, owner->len);
1057 sop->so_owner.len = owner->len;
1058 kref_init(&sop->so_ref);
1059 return sop;
1060 }
1061 kmem_cache_free(stateowner_slab, sop);
1062 }
1063 return NULL;
1064}
1065
1066static struct nfs4_stateowner *
1067alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068 struct nfs4_stateowner *sop;
1069 struct nfs4_replay *rp;
1070 unsigned int idhashval;
1071
1072 if (!(sop = alloc_stateowner(&open->op_owner)))
1073 return NULL;
1074 idhashval = ownerid_hashval(current_ownerid);
1075 INIT_LIST_HEAD(&sop->so_idhash);
1076 INIT_LIST_HEAD(&sop->so_strhash);
1077 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1078 INIT_LIST_HEAD(&sop->so_stateids);
1079 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1080 INIT_LIST_HEAD(&sop->so_close_lru);
1081 sop->so_time = 0;
1082 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1084 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1085 sop->so_is_open_owner = 1;
1086 sop->so_id = current_ownerid++;
1087 sop->so_client = clp;
1088 sop->so_seqid = open->op_seqid;
1089 sop->so_confirmed = 0;
1090 rp = &sop->so_replay;
de1ae286 1091 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1092 rp->rp_buflen = 0;
1093 rp->rp_buf = rp->rp_ibuf;
1094 return sop;
1095}
1096
1097static void
1098release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099{
1100 struct nfs4_stateowner *lock_sop;
1101
ea1da636
N		 1102 while (!list_empty(&open_stp->st_lockowners)) {
1103 lock_sop = list_entry(open_stp->st_lockowners.next,
1104 struct nfs4_stateowner, so_perstateid);
1105 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1106 BUG_ON(lock_sop->so_is_open_owner);
1107 release_stateowner(lock_sop);
1108 }
1109}
1110
1111static void
1112unhash_stateowner(struct nfs4_stateowner *sop)
1113{
1114 struct nfs4_stateid *stp;
1115
1116 list_del(&sop->so_idhash);
1117 list_del(&sop->so_strhash);
6fa305de 1118 if (sop->so_is_open_owner)
1da177e4 1119 list_del(&sop->so_perclient);
ea1da636
N		 1120 list_del(&sop->so_perstateid);
1121 while (!list_empty(&sop->so_stateids)) {
1122 stp = list_entry(sop->so_stateids.next,
1123 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1124 if (sop->so_is_open_owner)
1125 release_stateid(stp, OPEN_STATE);
1126 else
1127 release_stateid(stp, LOCK_STATE);
1128 }
1129}
1130
1131static void
1132release_stateowner(struct nfs4_stateowner *sop)
1133{
1134 unhash_stateowner(sop);
1135 list_del(&sop->so_close_lru);
1136 nfs4_put_stateowner(sop);
1137}
1138
1139static inline void
1140init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141 struct nfs4_stateowner *sop = open->op_stateowner;
1142 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1145 INIT_LIST_HEAD(&stp->st_perstateowner);
1146 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1147 INIT_LIST_HEAD(&stp->st_perfile);
1148 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1149 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1150 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1151 stp->st_stateowner = sop;
13cd2184 1152 get_nfs4_file(fp);
1da177e4
LT		 1153 stp->st_file = fp;
1154 stp->st_stateid.si_boot = boot_time;
1155 stp->st_stateid.si_stateownerid = sop->so_id;
1156 stp->st_stateid.si_fileid = fp->fi_id;
1157 stp->st_stateid.si_generation = 0;
1158 stp->st_access_bmap = 0;
1159 stp->st_deny_bmap = 0;
1160 __set_bit(open->op_share_access, &stp->st_access_bmap);
1161 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1162 stp->st_openstp = NULL;
1da177e4
LT		 1163}
1164
1165static void
1166release_stateid(struct nfs4_stateid *stp, int flags)
1167{
1168 struct file *filp = stp->st_vfs_file;
1169
1170 list_del(&stp->st_hash);
1da177e4 1171 list_del(&stp->st_perfile);
ea1da636 1172 list_del(&stp->st_perstateowner);
1da177e4
LT		 1173 if (flags & OPEN_STATE) {
1174 release_stateid_lockowners(stp);
1175 stp->st_vfs_file = NULL;
1176 nfsd_close(filp);
1da177e4
LT		 1177 } else if (flags & LOCK_STATE)
1178 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1179 put_nfs4_file(stp->st_file);
5ac049ac 1180 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1181}
1182
fd39ca9a 1183static void
1da177e4
LT		 1184move_to_close_lru(struct nfs4_stateowner *sop)
1185{
1186 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1187
358dd55a 1188 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1189 sop->so_time = get_seconds();
1190}
1191
1da177e4 1192static int
599e0a22
BF		 1193same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1194 clientid_t *clid)
1195{
1196 return (sop->so_owner.len == owner->len) &&
1197 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1198 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1199}
1200
1201static struct nfs4_stateowner *
1202find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1203{
1204 struct nfs4_stateowner *so = NULL;
1205
1206 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1207 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1208 return so;
1209 }
1210 return NULL;
1211}
1212
1213/* search file_hashtbl[] for file */
1214static struct nfs4_file *
1215find_file(struct inode *ino)
1216{
1217 unsigned int hashval = file_hashval(ino);
1218 struct nfs4_file *fp;
1219
1220 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1221 if (fp->fi_inode == ino) {
1222 get_nfs4_file(fp);
1da177e4 1223 return fp;
13cd2184 1224 }
1da177e4
LT		 1225 }
1226 return NULL;
1227}
1228
ba5a6a19
BF		 1229static int access_valid(u32 x)
1230{
1231 return (x > 0 && x < 4);
1232}
1233
1234static int deny_valid(u32 x)
1235{
1236 return (x >= 0 && x < 5);
1237}
1da177e4 1238
fd39ca9a 1239static void
1da177e4
LT		 1240set_access(unsigned int *access, unsigned long bmap) {
1241 int i;
1242
1243 *access = 0;
1244 for (i = 1; i < 4; i++) {
1245 if (test_bit(i, &bmap))
1246 *access |= i;
1247 }
1248}
1249
fd39ca9a 1250static void
1da177e4
LT		 1251set_deny(unsigned int *deny, unsigned long bmap) {
1252 int i;
1253
1254 *deny = 0;
1255 for (i = 0; i < 4; i++) {
1256 if (test_bit(i, &bmap))
1257 *deny |= i ;
1258 }
1259}
1260
1261static int
1262test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1263 unsigned int access, deny;
1264
1265 set_access(&access, stp->st_access_bmap);
1266 set_deny(&deny, stp->st_deny_bmap);
1267 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1268 return 0;
1269 return 1;
1270}
1271
1272/*
1273 * Called to check deny when READ with all zero stateid or
1274 * WRITE with all zero or all one stateid
1275 */
b37ad28b 1276static __be32
1da177e4
LT		 1277nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1278{
1279 struct inode *ino = current_fh->fh_dentry->d_inode;
1280 struct nfs4_file *fp;
1281 struct nfs4_stateid *stp;
b37ad28b 1282 __be32 ret;
1da177e4
LT		 1283
1284 dprintk("NFSD: nfs4_share_conflict\n");
1285
1286 fp = find_file(ino);
13cd2184
N		 1287 if (!fp)
1288 return nfs_ok;
b700949b 1289 ret = nfserr_locked;
1da177e4 1290 /* Search for conflicting share reservations */
13cd2184
N		 1291 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1292 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1293 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1294 goto out;
1da177e4 1295 }
13cd2184
N		 1296 ret = nfs_ok;
1297out:
1298 put_nfs4_file(fp);
1299 return ret;
1da177e4
LT		 1300}
1301
1302static inline void
1303nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1304{
1305 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1306 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1307 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1308 }
1309}
1310
1311/*
1312 * Recall a delegation
1313 */
1314static int
1315do_recall(void *__dp)
1316{
1317 struct nfs4_delegation *dp = __dp;
1318
47f9940c 1319 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1320 nfsd4_cb_recall(dp);
1321 return 0;
1322}
1323
1324/*
1325 * Spawn a thread to perform a recall on the delegation represented
1326 * by the lease (file_lock)
1327 *
1328 * Called from break_lease() with lock_kernel() held.
1329 * Note: we assume break_lease will only call this *once* for any given
1330 * lease.
1331 */
1332static
1333void nfsd_break_deleg_cb(struct file_lock *fl)
1334{
1335 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1336 struct task_struct *t;
1337
1338 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1339 if (!dp)
1340 return;
1341
1342 /* We're assuming the state code never drops its reference
1343 * without first removing the lease. Since we're in this lease
1344 * callback (and since the lease code is serialized by the kernel
1345 * lock) we know the server hasn't removed the lease yet, we know
1346 * it's safe to take a reference: */
1347 atomic_inc(&dp->dl_count);
cfdcad4d 1348 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1349
1350 spin_lock(&recall_lock);
1351 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1352 spin_unlock(&recall_lock);
1353
1354 /* only place dl_time is set. protected by lock_kernel*/
1355 dp->dl_time = get_seconds();
1356
0272e1fd
BF		 1357 /*
1358 * We don't want the locks code to timeout the lease for us;
1359 * we'll remove it ourself if the delegation isn't returned
1360 * in time.
1361 */
1362 fl->fl_break_time = 0;
1da177e4
LT		 1363
1364 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1365 if (IS_ERR(t)) {
1366 struct nfs4_client *clp = dp->dl_client;
1367
1368 printk(KERN_INFO "NFSD: Callback thread failed for "
1369 "for client (clientid %08x/%08x)\n",
1370 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1371 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1372 nfs4_put_delegation(dp);
1373 }
1374}
1375
1376/*
1377 * The file_lock is being reapd.
1378 *
1379 * Called by locks_free_lock() with lock_kernel() held.
1380 */
1381static
1382void nfsd_release_deleg_cb(struct file_lock *fl)
1383{
1384 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1385
1386 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1387
1388 if (!(fl->fl_flags & FL_LEASE) || !dp)
1389 return;
1390 dp->dl_flock = NULL;
1391}
1392
1393/*
1394 * Set the delegation file_lock back pointer.
1395 *
a9933cea 1396 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1397 */
1398static
1399void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1400{
1401 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1402
1403 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1404 if (!dp)
1405 return;
1406 dp->dl_flock = new;
1407}
1408
1409/*
a9933cea 1410 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1411 */
1412static
1413int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1414{
1415 struct nfs4_delegation *onlistd =
1416 (struct nfs4_delegation *)onlist->fl_owner;
1417 struct nfs4_delegation *tryd =
1418 (struct nfs4_delegation *)try->fl_owner;
1419
1420 if (onlist->fl_lmops != try->fl_lmops)
1421 return 0;
1422
1423 return onlistd->dl_client == tryd->dl_client;
1424}
1425
1426
1427static
1428int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1429{
1430 if (arg & F_UNLCK)
1431 return lease_modify(onlist, arg);
1432 else
1433 return -EAGAIN;
1434}
1435
fd39ca9a 1436static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1437 .fl_break = nfsd_break_deleg_cb,
1438 .fl_release_private = nfsd_release_deleg_cb,
1439 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1440 .fl_mylease = nfsd_same_client_deleg_cb,
1441 .fl_change = nfsd_change_deleg_cb,
1442};
1443
1444
b37ad28b 1445__be32
1da177e4
LT		 1446nfsd4_process_open1(struct nfsd4_open *open)
1447{
1da177e4
LT		 1448 clientid_t *clientid = &open->op_clientid;
1449 struct nfs4_client *clp = NULL;
1450 unsigned int strhashval;
1451 struct nfs4_stateowner *sop = NULL;
1452
1da177e4 1453 if (!check_name(open->op_owner))
0f442aa2 1454 return nfserr_inval;
1da177e4
LT		 1455
1456 if (STALE_CLIENTID(&open->op_clientid))
1457 return nfserr_stale_clientid;
1458
1459 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1460 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1461 open->op_stateowner = sop;
1462 if (!sop) {
1463 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1464 clp = find_confirmed_client(clientid);
1465 if (clp == NULL)
0f442aa2
BF		 1466 return nfserr_expired;
1467 goto renew;
1da177e4 1468 }
0f442aa2
BF		 1469 if (!sop->so_confirmed) {
1470 /* Replace unconfirmed owners without checking for replay. */
1471 clp = sop->so_client;
1472 release_stateowner(sop);
1473 open->op_stateowner = NULL;
1474 goto renew;
1475 }
1476 if (open->op_seqid == sop->so_seqid - 1) {
1477 if (sop->so_replay.rp_buflen)
a90b061c 1478 return nfserr_replay_me;
0f442aa2
BF		 1479 /* The original OPEN failed so spectacularly
1480 * that we don't even have replay data saved!
1481 * Therefore, we have no choice but to continue
1482 * processing this OPEN; presumably, we'll
1483 * fail again for the same reason.
1484 */
1485 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1486 goto renew;
1487 }
1488 if (open->op_seqid != sop->so_seqid)
1489 return nfserr_bad_seqid;
1da177e4 1490renew:
0f442aa2
BF		 1491 if (open->op_stateowner == NULL) {
1492 sop = alloc_init_open_stateowner(strhashval, clp, open);
1493 if (sop == NULL)
1494 return nfserr_resource;
1495 open->op_stateowner = sop;
1496 }
1497 list_del_init(&sop->so_close_lru);
1da177e4 1498 renew_client(sop->so_client);
0f442aa2 1499 return nfs_ok;
1da177e4
LT		 1500}
1501
b37ad28b 1502static inline __be32
4a6e43e6
N		 1503nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1504{
1505 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1506 return nfserr_openmode;
1507 else
1508 return nfs_ok;
1509}
1510
52f4fb43
N		 1511static struct nfs4_delegation *
1512find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1513{
1514 struct nfs4_delegation *dp;
1515
ea1da636 1516 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1517 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1518 return dp;
1519 }
1520 return NULL;
1521}
1522
b37ad28b 1523static __be32
567d9829
N		 1524nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1525 struct nfs4_delegation **dp)
1526{
1527 int flags;
b37ad28b 1528 __be32 status = nfserr_bad_stateid;
567d9829
N		 1529
1530 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1531 if (*dp == NULL)
c44c5eeb 1532 goto out;
567d9829
N		 1533 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1534 RD_STATE : WR_STATE;
1535 status = nfs4_check_delegmode(*dp, flags);
1536 if (status)
1537 *dp = NULL;
c44c5eeb
N		 1538out:
1539 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1540 return nfs_ok;
1541 if (status)
1542 return status;
1543 open->op_stateowner->so_confirmed = 1;
1544 return nfs_ok;
567d9829
N		 1545}
1546
b37ad28b 1547static __be32
1da177e4
LT		 1548nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1549{
1550 struct nfs4_stateid *local;
b37ad28b 1551 __be32 status = nfserr_share_denied;
1da177e4
LT		 1552 struct nfs4_stateowner *sop = open->op_stateowner;
1553
8beefa24 1554 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1555 /* ignore lock owners */
1556 if (local->st_stateowner->so_is_open_owner == 0)
1557 continue;
1558 /* remember if we have seen this open owner */
1559 if (local->st_stateowner == sop)
1560 *stpp = local;
1561 /* check for conflicting share reservations */
1562 if (!test_share(local, open))
1563 goto out;
1564 }
1565 status = 0;
1566out:
1567 return status;
1568}
1569
5ac049ac
N		 1570static inline struct nfs4_stateid *
1571nfs4_alloc_stateid(void)
1572{
1573 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1574}
1575
b37ad28b 1576static __be32
1da177e4 1577nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1578 struct nfs4_delegation *dp,
1da177e4
LT		 1579 struct svc_fh *cur_fh, int flags)
1580{
1581 struct nfs4_stateid *stp;
1da177e4 1582
5ac049ac 1583 stp = nfs4_alloc_stateid();
1da177e4
LT		 1584 if (stp == NULL)
1585 return nfserr_resource;
1586
567d9829
N		 1587 if (dp) {
1588 get_file(dp->dl_vfs_file);
1589 stp->st_vfs_file = dp->dl_vfs_file;
1590 } else {
b37ad28b 1591 __be32 status;
567d9829
N		 1592 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1593 &stp->st_vfs_file);
1594 if (status) {
1595 if (status == nfserr_dropit)
1596 status = nfserr_jukebox;
5ac049ac 1597 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1598 return status;
1599 }
1da177e4 1600 }
1da177e4
LT		 1601 *stpp = stp;
1602 return 0;
1603}
1604
b37ad28b 1605static inline __be32
1da177e4
LT		 1606nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1607 struct nfsd4_open *open)
1608{
1609 struct iattr iattr = {
1610 .ia_valid = ATTR_SIZE,
1611 .ia_size = 0,
1612 };
1613 if (!open->op_truncate)
1614 return 0;
1615 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1616 return nfserr_inval;
1da177e4
LT		 1617 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1618}
1619
b37ad28b 1620static __be32
1da177e4
LT		 1621nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1622{
1623 struct file *filp = stp->st_vfs_file;
7eaa36e2 1624 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1625 unsigned int share_access, new_writer;
b37ad28b 1626 __be32 status;
1da177e4
LT		 1627
1628 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1629 new_writer = (~share_access) & open->op_share_access
1630 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1631
6c26d08f 1632 if (new_writer) {
b37ad28b
AV		 1633 int err = get_write_access(inode);
1634 if (err)
1635 return nfserrno(err);
6c26d08f 1636 }
1da177e4
LT		 1637 status = nfsd4_truncate(rqstp, cur_fh, open);
1638 if (status) {
6c26d08f
BF		 1639 if (new_writer)
1640 put_write_access(inode);
1da177e4
LT		 1641 return status;
1642 }
1643 /* remember the open */
6c26d08f 1644 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1645 set_bit(open->op_share_access, &stp->st_access_bmap);
1646 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1647
1648 return nfs_ok;
1649}
1650
1651
1da177e4 1652static void
37515177 1653nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1654{
37515177
N		 1655 open->op_stateowner->so_confirmed = 1;
1656 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1657}
1658
1659/*
1660 * Attempt to hand out a delegation.
1661 */
1662static void
1663nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1664{
1665 struct nfs4_delegation *dp;
1666 struct nfs4_stateowner *sop = stp->st_stateowner;
1667 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1668 struct file_lock fl, *flp = &fl;
1669 int status, flag = 0;
1670
1671 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1672 open->op_recall = 0;
1673 switch (open->op_claim_type) {
1674 case NFS4_OPEN_CLAIM_PREVIOUS:
1675 if (!atomic_read(&cb->cb_set))
1676 open->op_recall = 1;
1677 flag = open->op_delegate_type;
1678 if (flag == NFS4_OPEN_DELEGATE_NONE)
1679 goto out;
1680 break;
1681 case NFS4_OPEN_CLAIM_NULL:
1682 /* Let's not give out any delegations till everyone's
1683 * had the chance to reclaim theirs.... */
1684 if (nfs4_in_grace())
1685 goto out;
1686 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1687 goto out;
1688 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1689 flag = NFS4_OPEN_DELEGATE_WRITE;
1690 else
1691 flag = NFS4_OPEN_DELEGATE_READ;
1692 break;
1693 default:
1694 goto out;
1695 }
1da177e4
LT		 1696
1697 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1698 if (dp == NULL) {
1699 flag = NFS4_OPEN_DELEGATE_NONE;
1700 goto out;
1701 }
1702 locks_init_lock(&fl);
1703 fl.fl_lmops = &nfsd_lease_mng_ops;
1704 fl.fl_flags = FL_LEASE;
1705 fl.fl_end = OFFSET_MAX;
1706 fl.fl_owner = (fl_owner_t)dp;
1707 fl.fl_file = stp->st_vfs_file;
1708 fl.fl_pid = current->tgid;
1709
a9933cea 1710 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1711 * the lock_manager callbacks fl_mylease and fl_change are used
1712 */
a9933cea 1713 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1714 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1715 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1716 unhash_delegation(dp);
1da177e4
LT		 1717 flag = NFS4_OPEN_DELEGATE_NONE;
1718 goto out;
1719 }
1720
1721 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1722
1723 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1724 dp->dl_stateid.si_boot,
1725 dp->dl_stateid.si_stateownerid,
1726 dp->dl_stateid.si_fileid,
1727 dp->dl_stateid.si_generation);
1728out:
7b190fec
N		 1729 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1730 && flag == NFS4_OPEN_DELEGATE_NONE
1731 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1732 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1733 open->op_delegate_type = flag;
1734}
1735
1736/*
1737 * called with nfs4_lock_state() held.
1738 */
b37ad28b 1739__be32
1da177e4
LT		 1740nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1741{
1742 struct nfs4_file *fp = NULL;
1743 struct inode *ino = current_fh->fh_dentry->d_inode;
1744 struct nfs4_stateid *stp = NULL;
567d9829 1745 struct nfs4_delegation *dp = NULL;
b37ad28b 1746 __be32 status;
1da177e4
LT		 1747
1748 status = nfserr_inval;
ba5a6a19
BF		 1749 if (!access_valid(open->op_share_access)
1750 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1751 goto out;
1752 /*
1753 * Lookup file; if found, lookup stateid and check open request,
1754 * and check for delegations in the process of being recalled.
1755 * If not found, create the nfs4_file struct
1756 */
1757 fp = find_file(ino);
1758 if (fp) {
1759 if ((status = nfs4_check_open(fp, open, &stp)))
1760 goto out;
c44c5eeb
N		 1761 status = nfs4_check_deleg(fp, open, &dp);
1762 if (status)
1763 goto out;
1da177e4 1764 } else {
c44c5eeb
N		 1765 status = nfserr_bad_stateid;
1766 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1767 goto out;
1da177e4
LT		 1768 status = nfserr_resource;
1769 fp = alloc_init_file(ino);
1770 if (fp == NULL)
1771 goto out;
1772 }
1773
1774 /*
1775 * OPEN the file, or upgrade an existing OPEN.
1776 * If truncate fails, the OPEN fails.
1777 */
1778 if (stp) {
1779 /* Stateid was found, this is an OPEN upgrade */
1780 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1781 if (status)
1782 goto out;
444c2c07 1783 update_stateid(&stp->st_stateid);
1da177e4
LT		 1784 } else {
1785 /* Stateid was not found, this is a new OPEN */
1786 int flags = 0;
9ecb6a08
BF		 1787 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1788 flags |= MAY_READ;
1da177e4 1789 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1790 flags |= MAY_WRITE;
567d9829
N		 1791 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1792 if (status)
1da177e4
LT		 1793 goto out;
1794 init_stateid(stp, fp, open);
1795 status = nfsd4_truncate(rqstp, current_fh, open);
1796 if (status) {
1797 release_stateid(stp, OPEN_STATE);
1798 goto out;
1799 }
1800 }
1801 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1802
1803 /*
1804 * Attempt to hand out a delegation. No error return, because the
1805 * OPEN succeeds even if we fail.
1806 */
1807 nfs4_open_delegation(current_fh, open, stp);
1808
1809 status = nfs_ok;
1810
1811 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1812 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1813 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1814out:
13cd2184
N		 1815 if (fp)
1816 put_nfs4_file(fp);
37515177
N		 1817 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1818 nfs4_set_claim_prev(open);
1da177e4
LT		 1819 /*
1820 * To finish the open response, we just need to set the rflags.
1821 */
1822 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1823 if (!open->op_stateowner->so_confirmed)
1824 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1825
1826 return status;
1827}
1828
58da282b 1829static struct workqueue_struct *laundry_wq;
c4028958
DH		 1830static void laundromat_main(struct work_struct *);
1831static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1832
b37ad28b 1833__be32
b591480b
BF		 1834nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1835 clientid_t *clid)
1da177e4
LT		 1836{
1837 struct nfs4_client *clp;
b37ad28b 1838 __be32 status;
1da177e4
LT		 1839
1840 nfs4_lock_state();
1841 dprintk("process_renew(%08x/%08x): starting\n",
1842 clid->cl_boot, clid->cl_id);
1843 status = nfserr_stale_clientid;
1844 if (STALE_CLIENTID(clid))
1845 goto out;
1846 clp = find_confirmed_client(clid);
1847 status = nfserr_expired;
1848 if (clp == NULL) {
1849 /* We assume the client took too long to RENEW. */
1850 dprintk("nfsd4_renew: clientid not found!\n");
1851 goto out;
1852 }
1853 renew_client(clp);
1854 status = nfserr_cb_path_down;
ea1da636 1855 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1856 && !atomic_read(&clp->cl_callback.cb_set))
1857 goto out;
1858 status = nfs_ok;
1859out:
1860 nfs4_unlock_state();
1861 return status;
1862}
1863
a76b4319
N		 1864static void
1865end_grace(void)
1866{
1867 dprintk("NFSD: end of grace period\n");
c7b9a459 1868 nfsd4_recdir_purge_old();
a76b4319
N		 1869 in_grace = 0;
1870}
1871
fd39ca9a 1872static time_t
1da177e4
LT		 1873nfs4_laundromat(void)
1874{
1875 struct nfs4_client *clp;
1876 struct nfs4_stateowner *sop;
1877 struct nfs4_delegation *dp;
1878 struct list_head *pos, *next, reaplist;
1879 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1880 time_t t, clientid_val = NFSD_LEASE_TIME;
1881 time_t u, test_val = NFSD_LEASE_TIME;
1882
1883 nfs4_lock_state();
1884
1885 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1886 if (in_grace)
1887 end_grace();
1da177e4
LT		 1888 list_for_each_safe(pos, next, &client_lru) {
1889 clp = list_entry(pos, struct nfs4_client, cl_lru);
1890 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1891 t = clp->cl_time - cutoff;
1892 if (clientid_val > t)
1893 clientid_val = t;
1894 break;
1895 }
1896 dprintk("NFSD: purging unused client (clientid %08x)\n",
1897 clp->cl_clientid.cl_id);
c7b9a459 1898 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1899 expire_client(clp);
1900 }
1901 INIT_LIST_HEAD(&reaplist);
1902 spin_lock(&recall_lock);
1903 list_for_each_safe(pos, next, &del_recall_lru) {
1904 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1905 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1906 u = dp->dl_time - cutoff;
1907 if (test_val > u)
1908 test_val = u;
1909 break;
1910 }
1911 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1912 dp, dp->dl_flock);
1913 list_move(&dp->dl_recall_lru, &reaplist);
1914 }
1915 spin_unlock(&recall_lock);
1916 list_for_each_safe(pos, next, &reaplist) {
1917 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1918 list_del_init(&dp->dl_recall_lru);
1919 unhash_delegation(dp);
1920 }
1921 test_val = NFSD_LEASE_TIME;
1922 list_for_each_safe(pos, next, &close_lru) {
1923 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1924 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1925 u = sop->so_time - cutoff;
1926 if (test_val > u)
1927 test_val = u;
1928 break;
1929 }
1930 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1931 sop->so_id);
358dd55a 1932 release_stateowner(sop);
1da177e4
LT		 1933 }
1934 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1935 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1936 nfs4_unlock_state();
1937 return clientid_val;
1938}
1939
1940void
c4028958 1941laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1942{
1943 time_t t;
1944
1945 t = nfs4_laundromat();
1946 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1947 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1948}
1949
fd39ca9a 1950static struct nfs4_stateowner *
f8816512
N		 1951search_close_lru(u32 st_id, int flags)
1952{
1da177e4
LT		 1953 struct nfs4_stateowner *local = NULL;
1954
1da177e4
LT		 1955 if (flags & CLOSE_STATE) {
1956 list_for_each_entry(local, &close_lru, so_close_lru) {
1957 if (local->so_id == st_id)
1958 return local;
1959 }
1960 }
1961 return NULL;
1962}
1963
1964static inline int
1965nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1966{
7eaa36e2 1967 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1968}
1969
1970static int
1971STALE_STATEID(stateid_t *stateid)
1972{
1973 if (stateid->si_boot == boot_time)
1974 return 0;
849823c5 1975 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1976 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1977 stateid->si_generation);
1978 return 1;
1979}
1980
1981static inline int
1982access_permit_read(unsigned long access_bmap)
1983{
1984 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1985 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1986 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1987}
1988
1989static inline int
1990access_permit_write(unsigned long access_bmap)
1991{
1992 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1993 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1994}
1995
1996static
b37ad28b 1997__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1998{
b37ad28b 1999 __be32 status = nfserr_openmode;
1da177e4
LT		 2000
2001 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2002 goto out;
2003 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2004 goto out;
2005 status = nfs_ok;
2006out:
2007 return status;
2008}
2009
b37ad28b 2010static inline __be32
1da177e4
LT		 2011check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2012{
2013 /* Trying to call delegreturn with a special stateid? Yuch: */
2014 if (!(flags & (RD_STATE | WR_STATE)))
2015 return nfserr_bad_stateid;
2016 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2017 return nfs_ok;
2018 else if (nfs4_in_grace()) {
2019 /* Answer in remaining cases depends on existance of
2020 * conflicting state; so we must wait out the grace period. */
2021 return nfserr_grace;
2022 } else if (flags & WR_STATE)
2023 return nfs4_share_conflict(current_fh,
2024 NFS4_SHARE_DENY_WRITE);
2025 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2026 return nfs4_share_conflict(current_fh,
2027 NFS4_SHARE_DENY_READ);
2028}
2029
2030/*
2031 * Allow READ/WRITE during grace period on recovered state only for files
2032 * that are not able to provide mandatory locking.
2033 */
2034static inline int
2035io_during_grace_disallowed(struct inode *inode, int flags)
2036{
2037 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 2038 && mandatory_lock(inode);
1da177e4
LT		 2039}
2040
2041/*
2042* Checks for stateid operations
2043*/
b37ad28b 2044__be32
1da177e4
LT		 2045nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2046{
2047 struct nfs4_stateid *stp = NULL;
2048 struct nfs4_delegation *dp = NULL;
2049 stateid_t *stidp;
2050 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2051 __be32 status;
1da177e4
LT		 2052
2053 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2054 stateid->si_boot, stateid->si_stateownerid,
2055 stateid->si_fileid, stateid->si_generation);
2056 if (filpp)
2057 *filpp = NULL;
2058
2059 if (io_during_grace_disallowed(ino, flags))
2060 return nfserr_grace;
2061
2062 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2063 return check_special_stateids(current_fh, stateid, flags);
2064
2065 /* STALE STATEID */
2066 status = nfserr_stale_stateid;
2067 if (STALE_STATEID(stateid))
2068 goto out;
2069
2070 /* BAD STATEID */
2071 status = nfserr_bad_stateid;
2072 if (!stateid->si_fileid) { /* delegation stateid */
2073 if(!(dp = find_delegation_stateid(ino, stateid))) {
2074 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2075 goto out;
2076 }
2077 stidp = &dp->dl_stateid;
2078 } else { /* open or lock stateid */
2079 if (!(stp = find_stateid(stateid, flags))) {
2080 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2081 goto out;
2082 }
2083 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2084 goto out;
2085 if (!stp->st_stateowner->so_confirmed)
2086 goto out;
2087 stidp = &stp->st_stateid;
2088 }
2089 if (stateid->si_generation > stidp->si_generation)
2090 goto out;
2091
2092 /* OLD STATEID */
2093 status = nfserr_old_stateid;
2094 if (stateid->si_generation < stidp->si_generation)
2095 goto out;
2096 if (stp) {
2097 if ((status = nfs4_check_openmode(stp,flags)))
2098 goto out;
2099 renew_client(stp->st_stateowner->so_client);
2100 if (filpp)
2101 *filpp = stp->st_vfs_file;
2102 } else if (dp) {
2103 if ((status = nfs4_check_delegmode(dp, flags)))
2104 goto out;
2105 renew_client(dp->dl_client);
2106 if (flags & DELEG_RET)
2107 unhash_delegation(dp);
2108 if (filpp)
2109 *filpp = dp->dl_vfs_file;
2110 }
2111 status = nfs_ok;
2112out:
2113 return status;
2114}
2115
4c4cd222
N		 2116static inline int
2117setlkflg (int type)
2118{
2119 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2120 RD_STATE : WR_STATE;
2121}
1da177e4
LT		 2122
2123/*
2124 * Checks for sequence id mutating operations.
2125 */
b37ad28b 2126static __be32
4c4cd222 2127nfs4_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 2128{
1da177e4
LT		 2129 struct nfs4_stateid *stp;
2130 struct nfs4_stateowner *sop;
2131
2132 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2133 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2134 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2135 stateid->si_generation);
3a4f98bb 2136
1da177e4
LT		 2137 *stpp = NULL;
2138 *sopp = NULL;
2139
1da177e4 2140 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2141 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2142 return nfserr_bad_stateid;
1da177e4
LT		 2143 }
2144
1da177e4 2145 if (STALE_STATEID(stateid))
3a4f98bb 2146 return nfserr_stale_stateid;
1da177e4
LT		 2147 /*
2148 * We return BAD_STATEID if filehandle doesn't match stateid,
2149 * the confirmed flag is incorrecly set, or the generation
2150 * number is incorrect.
1da177e4 2151 */
f8816512
N		 2152 stp = find_stateid(stateid, flags);
2153 if (stp == NULL) {
2154 /*
2155 * Also, we should make sure this isn't just the result of
2156 * a replayed close:
2157 */
2158 sop = search_close_lru(stateid->si_stateownerid, flags);
2159 if (sop == NULL)
2160 return nfserr_bad_stateid;
2161 *sopp = sop;
2162 goto check_replay;
2163 }
1da177e4 2164
4c4cd222 2165 if (lock) {
1da177e4 2166 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2167 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2168 struct nfs4_client *clp = sop->so_client;
4c4cd222 2169 int lkflg = 0;
b37ad28b 2170 __be32 status;
4c4cd222
N		 2171
2172 lkflg = setlkflg(lock->lk_type);
2173
2174 if (lock->lk_is_new) {
599e0a22
BF		 2175 if (!sop->so_is_open_owner)
2176 return nfserr_bad_stateid;
2177 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2178 return nfserr_bad_stateid;
599e0a22
BF		 2179 /* stp is the open stateid */
2180 status = nfs4_check_openmode(stp, lkflg);
2181 if (status)
2182 return status;
2183 } else {
2184 /* stp is the lock stateid */
2185 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2186 if (status)
2187 return status;
4c4cd222 2188 }
1da177e4
LT		 2189 }
2190
2191 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2192 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2193 return nfserr_bad_stateid;
1da177e4
LT		 2194 }
2195
2196 *stpp = stp;
2197 *sopp = sop = stp->st_stateowner;
2198
2199 /*
2200 * We now validate the seqid and stateid generation numbers.
2201 * For the moment, we ignore the possibility of
2202 * generation number wraparound.
2203 */
bd9aac52 2204 if (seqid != sop->so_seqid)
1da177e4
LT		 2205 goto check_replay;
2206
3a4f98bb 2207 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2208 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2209 " unconfirmed stateowner!\n");
2210 return nfserr_bad_stateid;
1da177e4 2211 }
3a4f98bb 2212 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2213 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2214 " confirmed yet!\n");
2215 return nfserr_bad_stateid;
1da177e4
LT		 2216 }
2217 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2218 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2219 return nfserr_bad_stateid;
1da177e4
LT		 2220 }
2221
1da177e4 2222 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2223 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2224 return nfserr_old_stateid;
1da177e4 2225 }
52fd004e 2226 renew_client(sop->so_client);
3a4f98bb 2227 return nfs_ok;
1da177e4 2228
1da177e4 2229check_replay:
bd9aac52 2230 if (seqid == sop->so_seqid - 1) {
849823c5 2231 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2232 /* indicate replay to calling function */
a90b061c 2233 return nfserr_replay_me;
1da177e4 2234 }
2fdada03 2235 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2236 sop->so_seqid, seqid);
2237 *sopp = NULL;
2238 return nfserr_bad_seqid;
1da177e4
LT		 2239}
2240
b37ad28b 2241__be32
ca364317 2242nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2243 struct nfsd4_open_confirm *oc)
1da177e4 2244{
b37ad28b 2245 __be32 status;
1da177e4
LT		 2246 struct nfs4_stateowner *sop;
2247 struct nfs4_stateid *stp;
2248
2249 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2250 (int)cstate->current_fh.fh_dentry->d_name.len,
2251 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2252
ca364317 2253 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2254 if (status)
2255 return status;
1da177e4
LT		 2256
2257 nfs4_lock_state();
2258
ca364317
BF		 2259 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2260 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2261 CHECK_FH | CONFIRM | OPEN_STATE,
2262 &oc->oc_stateowner, &stp, NULL)))
2263 goto out;
2264
2265 sop = oc->oc_stateowner;
2266 sop->so_confirmed = 1;
2267 update_stateid(&stp->st_stateid);
2268 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2269 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2270 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2271 stp->st_stateid.si_boot,
2272 stp->st_stateid.si_stateownerid,
2273 stp->st_stateid.si_fileid,
2274 stp->st_stateid.si_generation);
c7b9a459
N		 2275
2276 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2277out:
f2327d9a 2278 if (oc->oc_stateowner) {
1da177e4 2279 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2280 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2281 }
1da177e4
LT		 2282 nfs4_unlock_state();
2283 return status;
2284}
2285
2286
2287/*
2288 * unset all bits in union bitmap (bmap) that
2289 * do not exist in share (from successful OPEN_DOWNGRADE)
2290 */
2291static void
2292reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2293{
2294 int i;
2295 for (i = 1; i < 4; i++) {
2296 if ((i & access) != i)
2297 __clear_bit(i, bmap);
2298 }
2299}
2300
2301static void
2302reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2303{
2304 int i;
2305 for (i = 0; i < 4; i++) {
2306 if ((i & deny) != i)
2307 __clear_bit(i, bmap);
2308 }
2309}
2310
b37ad28b 2311__be32
ca364317
BF		 2312nfsd4_open_downgrade(struct svc_rqst *rqstp,
2313 struct nfsd4_compound_state *cstate,
a4f1706a 2314 struct nfsd4_open_downgrade *od)
1da177e4 2315{
b37ad28b 2316 __be32 status;
1da177e4
LT		 2317 struct nfs4_stateid *stp;
2318 unsigned int share_access;
2319
2320 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2321 (int)cstate->current_fh.fh_dentry->d_name.len,
2322 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2323
ba5a6a19
BF		 2324 if (!access_valid(od->od_share_access)
2325 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2326 return nfserr_inval;
2327
2328 nfs4_lock_state();
ca364317
BF		 2329 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2330 od->od_seqid,
1da177e4
LT		 2331 &od->od_stateid,
2332 CHECK_FH | OPEN_STATE,
2333 &od->od_stateowner, &stp, NULL)))
2334 goto out;
2335
2336 status = nfserr_inval;
2337 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2338 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2339 stp->st_access_bmap, od->od_share_access);
2340 goto out;
2341 }
2342 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2343 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2344 stp->st_deny_bmap, od->od_share_deny);
2345 goto out;
2346 }
2347 set_access(&share_access, stp->st_access_bmap);
2348 nfs4_file_downgrade(stp->st_vfs_file,
2349 share_access & ~od->od_share_access);
2350
2351 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2352 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2353
2354 update_stateid(&stp->st_stateid);
2355 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2356 status = nfs_ok;
2357out:
f2327d9a 2358 if (od->od_stateowner) {
1da177e4 2359 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2360 cstate->replay_owner = od->od_stateowner;
f2327d9a 2361 }
1da177e4
LT		 2362 nfs4_unlock_state();
2363 return status;
2364}
2365
2366/*
2367 * nfs4_unlock_state() called after encode
2368 */
b37ad28b 2369__be32
ca364317 2370nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2371 struct nfsd4_close *close)
1da177e4 2372{
b37ad28b 2373 __be32 status;
1da177e4
LT		 2374 struct nfs4_stateid *stp;
2375
2376 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2377 (int)cstate->current_fh.fh_dentry->d_name.len,
2378 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2379
2380 nfs4_lock_state();
2381 /* check close_lru for replay */
ca364317
BF		 2382 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2383 close->cl_seqid,
1da177e4
LT		 2384 &close->cl_stateid,
2385 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2386 &close->cl_stateowner, &stp, NULL)))
2387 goto out;
1da177e4
LT		 2388 status = nfs_ok;
2389 update_stateid(&stp->st_stateid);
2390 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2391
04ef5954
BF		 2392 /* release_stateid() calls nfsd_close() if needed */
2393 release_stateid(stp, OPEN_STATE);
2394
2395 /* place unused nfs4_stateowners on so_close_lru list to be
2396 * released by the laundromat service after the lease period
2397 * to enable us to handle CLOSE replay
2398 */
2399 if (list_empty(&close->cl_stateowner->so_stateids))
2400 move_to_close_lru(close->cl_stateowner);
1da177e4 2401out:
f2327d9a 2402 if (close->cl_stateowner) {
1da177e4 2403 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2404 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2405 }
1da177e4
LT		 2406 nfs4_unlock_state();
2407 return status;
2408}
2409
b37ad28b 2410__be32
ca364317
BF		 2411nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2412 struct nfsd4_delegreturn *dr)
1da177e4 2413{
b37ad28b 2414 __be32 status;
1da177e4 2415
ca364317 2416 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2417 goto out;
2418
2419 nfs4_lock_state();
ca364317
BF		 2420 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2421 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2422 nfs4_unlock_state();
2423out:
2424 return status;
2425}
2426
2427
2428/*
2429 * Lock owner state (byte-range locks)
2430 */
2431#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2432#define LOCK_HASH_BITS 8
2433#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2434#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2435
2436#define lockownerid_hashval(id) \
2437 ((id) & LOCK_HASH_MASK)
2438
2439static inline unsigned int
2440lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2441 struct xdr_netobj *ownername)
2442{
2443 return (file_hashval(inode) + cl_id
2444 + opaque_hashval(ownername->data, ownername->len))
2445 & LOCK_HASH_MASK;
2446}
2447
2448static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2449static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2450static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2451
fd39ca9a 2452static struct nfs4_stateid *
1da177e4
LT		 2453find_stateid(stateid_t *stid, int flags)
2454{
2455 struct nfs4_stateid *local = NULL;
2456 u32 st_id = stid->si_stateownerid;
2457 u32 f_id = stid->si_fileid;
2458 unsigned int hashval;
2459
2460 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2461 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2462 hashval = stateid_hashval(st_id, f_id);
2463 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2464 if ((local->st_stateid.si_stateownerid == st_id) &&
2465 (local->st_stateid.si_fileid == f_id))
2466 return local;
2467 }
2468 }
2469 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2470 hashval = stateid_hashval(st_id, f_id);
2471 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2472 if ((local->st_stateid.si_stateownerid == st_id) &&
2473 (local->st_stateid.si_fileid == f_id))
2474 return local;
2475 }
849823c5 2476 }
1da177e4
LT		 2477 return NULL;
2478}
2479
2480static struct nfs4_delegation *
2481find_delegation_stateid(struct inode *ino, stateid_t *stid)
2482{
13cd2184
N		 2483 struct nfs4_file *fp;
2484 struct nfs4_delegation *dl;
1da177e4
LT		 2485
2486 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2487 stid->si_boot, stid->si_stateownerid,
2488 stid->si_fileid, stid->si_generation);
2489
1da177e4 2490 fp = find_file(ino);
13cd2184
N		 2491 if (!fp)
2492 return NULL;
2493 dl = find_delegation_file(fp, stid);
2494 put_nfs4_file(fp);
2495 return dl;
1da177e4
LT		 2496}
2497
2498/*
2499 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2500 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2501 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2502 * locking, this prevents us from being completely protocol-compliant. The
2503 * real solution to this problem is to start using unsigned file offsets in
2504 * the VFS, but this is a very deep change!
2505 */
2506static inline void
2507nfs4_transform_lock_offset(struct file_lock *lock)
2508{
2509 if (lock->fl_start < 0)
2510 lock->fl_start = OFFSET_MAX;
2511 if (lock->fl_end < 0)
2512 lock->fl_end = OFFSET_MAX;
2513}
2514
d5b9026a
N		 2515/* Hack!: For now, we're defining this just so we can use a pointer to it
2516 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2517static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2518};
1da177e4
LT		 2519
2520static inline void
2521nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2522{
d5b9026a
N		 2523 struct nfs4_stateowner *sop;
2524 unsigned int hval;
1da177e4 2525
d5b9026a
N		 2526 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2527 sop = (struct nfs4_stateowner *) fl->fl_owner;
2528 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2529 kref_get(&sop->so_ref);
2530 deny->ld_sop = sop;
2531 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2532 } else {
2533 deny->ld_sop = NULL;
2534 deny->ld_clientid.cl_boot = 0;
2535 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2536 }
2537 deny->ld_start = fl->fl_start;
2538 deny->ld_length = ~(u64)0;
2539 if (fl->fl_end != ~(u64)0)
2540 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2541 deny->ld_type = NFS4_READ_LT;
2542 if (fl->fl_type != F_RDLCK)
2543 deny->ld_type = NFS4_WRITE_LT;
2544}
2545
1da177e4
LT		 2546static struct nfs4_stateowner *
2547find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2548 struct xdr_netobj *owner)
2549{
2550 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2551 struct nfs4_stateowner *op;
2552
2553 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2554 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2555 return op;
2556 }
2557 return NULL;
2558}
2559
2560/*
2561 * Alloc a lock owner structure.
2562 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2563 * occured.
2564 *
2565 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2566 */
2567
2568static struct nfs4_stateowner *
2569alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2570 struct nfs4_stateowner *sop;
2571 struct nfs4_replay *rp;
2572 unsigned int idhashval;
2573
2574 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2575 return NULL;
2576 idhashval = lockownerid_hashval(current_ownerid);
2577 INIT_LIST_HEAD(&sop->so_idhash);
2578 INIT_LIST_HEAD(&sop->so_strhash);
2579 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2580 INIT_LIST_HEAD(&sop->so_stateids);
2581 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2582 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2583 sop->so_time = 0;
2584 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2585 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2586 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2587 sop->so_is_open_owner = 0;
2588 sop->so_id = current_ownerid++;
2589 sop->so_client = clp;
b59e3c0e
NB		 2590 /* It is the openowner seqid that will be incremented in encode in the
2591 * case of new lockowners; so increment the lock seqid manually: */
2592 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2593 sop->so_confirmed = 1;
2594 rp = &sop->so_replay;
de1ae286 2595 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2596 rp->rp_buflen = 0;
2597 rp->rp_buf = rp->rp_ibuf;
2598 return sop;
2599}
2600
fd39ca9a 2601static struct nfs4_stateid *
1da177e4
LT		 2602alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2603{
2604 struct nfs4_stateid *stp;
2605 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2606
5ac049ac
N		 2607 stp = nfs4_alloc_stateid();
2608 if (stp == NULL)
1da177e4
LT		 2609 goto out;
2610 INIT_LIST_HEAD(&stp->st_hash);
2611 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2612 INIT_LIST_HEAD(&stp->st_perstateowner);
2613 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2614 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2615 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2616 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2617 stp->st_stateowner = sop;
13cd2184 2618 get_nfs4_file(fp);
1da177e4
LT		 2619 stp->st_file = fp;
2620 stp->st_stateid.si_boot = boot_time;
2621 stp->st_stateid.si_stateownerid = sop->so_id;
2622 stp->st_stateid.si_fileid = fp->fi_id;
2623 stp->st_stateid.si_generation = 0;
2624 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2625 stp->st_access_bmap = open_stp->st_access_bmap;
2626 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2627 stp->st_openstp = open_stp;
1da177e4
LT		 2628
2629out:
2630 return stp;
2631}
2632
fd39ca9a 2633static int
1da177e4
LT		 2634check_lock_length(u64 offset, u64 length)
2635{
2636 return ((length == 0) || ((length != ~(u64)0) &&
2637 LOFF_OVERFLOW(offset, length)));
2638}
2639
2640/*
2641 * LOCK operation
2642 */
b37ad28b 2643__be32
ca364317 2644nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2645 struct nfsd4_lock *lock)
1da177e4 2646{
3e9e3dbe 2647 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2648 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2649 struct nfs4_stateid *lock_stp;
2650 struct file *filp;
2651 struct file_lock file_lock;
8dc7c311 2652 struct file_lock conflock;
b37ad28b 2653 __be32 status = 0;
1da177e4 2654 unsigned int strhashval;
150b3934 2655 unsigned int cmd;
b8dd7b9a 2656 int err;
1da177e4
LT		 2657
2658 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2659 (long long) lock->lk_offset,
2660 (long long) lock->lk_length);
2661
1da177e4
LT		 2662 if (check_lock_length(lock->lk_offset, lock->lk_length))
2663 return nfserr_inval;
2664
ca364317
BF		 2665 if ((status = fh_verify(rqstp, &cstate->current_fh,
2666 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2667 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2668 return status;
2669 }
2670
1da177e4
LT		 2671 nfs4_lock_state();
2672
2673 if (lock->lk_is_new) {
893f8770
N		 2674 /*
2675 * Client indicates that this is a new lockowner.
2676 * Use open owner and open stateid to create lock owner and
2677 * lock stateid.
2678 */
1da177e4
LT		 2679 struct nfs4_stateid *open_stp = NULL;
2680 struct nfs4_file *fp;
2681
2682 status = nfserr_stale_clientid;
849823c5 2683 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2684 goto out;
1da177e4 2685
1da177e4 2686 /* validate and update open stateid and open seqid */
ca364317 2687 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2688 lock->lk_new_open_seqid,
2689 &lock->lk_new_open_stateid,
2690 CHECK_FH | OPEN_STATE,
3a65588a 2691 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2692 lock);
37515177 2693 if (status)
1da177e4 2694 goto out;
3a65588a 2695 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2696 /* create lockowner and lock stateid */
2697 fp = open_stp->st_file;
2698 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2699 open_sop->so_client->cl_clientid.cl_id,
2700 &lock->v.new.owner);
3e9e3dbe
N		 2701 /* XXX: Do we need to check for duplicate stateowners on
2702 * the same file, or should they just be allowed (and
2703 * create new stateids)? */
1da177e4 2704 status = nfserr_resource;
b59e3c0e
NB		 2705 lock_sop = alloc_init_lock_stateowner(strhashval,
2706 open_sop->so_client, open_stp, lock);
2707 if (lock_sop == NULL)
1da177e4 2708 goto out;
b59e3c0e 2709 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2710 if (lock_stp == NULL)
1da177e4 2711 goto out;
1da177e4
LT		 2712 } else {
2713 /* lock (lock owner + lock stateid) already exists */
ca364317 2714 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2715 lock->lk_old_lock_seqid,
2716 &lock->lk_old_lock_stateid,
2717 CHECK_FH | LOCK_STATE,
3a65588a 2718 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2719 if (status)
2720 goto out;
3a65588a 2721 lock_sop = lock->lk_replay_owner;
1da177e4 2722 }
3a65588a 2723 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2724 filp = lock_stp->st_vfs_file;
2725
0dd395dc
N		 2726 status = nfserr_grace;
2727 if (nfs4_in_grace() && !lock->lk_reclaim)
2728 goto out;
2729 status = nfserr_no_grace;
2730 if (!nfs4_in_grace() && lock->lk_reclaim)
2731 goto out;
2732
1da177e4
LT		 2733 locks_init_lock(&file_lock);
2734 switch (lock->lk_type) {
2735 case NFS4_READ_LT:
2736 case NFS4_READW_LT:
2737 file_lock.fl_type = F_RDLCK;
150b3934 2738 cmd = F_SETLK;
1da177e4
LT		 2739 break;
2740 case NFS4_WRITE_LT:
2741 case NFS4_WRITEW_LT:
2742 file_lock.fl_type = F_WRLCK;
150b3934 2743 cmd = F_SETLK;
1da177e4
LT		 2744 break;
2745 default:
2746 status = nfserr_inval;
2747 goto out;
2748 }
b59e3c0e 2749 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2750 file_lock.fl_pid = current->tgid;
2751 file_lock.fl_file = filp;
2752 file_lock.fl_flags = FL_POSIX;
d5b9026a 2753 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2754
2755 file_lock.fl_start = lock->lk_offset;
2756 if ((lock->lk_length == ~(u64)0) ||
2757 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2758 file_lock.fl_end = ~(u64)0;
2759 else
2760 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2761 nfs4_transform_lock_offset(&file_lock);
2762
2763 /*
2764 * Try to lock the file in the VFS.
2765 * Note: locks.c uses the BKL to protect the inode's lock list.
2766 */
2767
eb76b3fd
AA		 2768 /* XXX?: Just to divert the locks_release_private at the start of
2769 * locks_copy_lock: */
150b3934 2770 locks_init_lock(&conflock);
fd85b817 2771 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2772 switch (-err) {
1da177e4
LT		 2773 case 0: /* success! */
2774 update_stateid(&lock_stp->st_stateid);
2775 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2776 sizeof(stateid_t));
b8dd7b9a 2777 status = 0;
eb76b3fd
AA		 2778 break;
2779 case (EAGAIN): /* conflock holds conflicting lock */
2780 status = nfserr_denied;
2781 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2782 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2783 break;
1da177e4
LT		 2784 case (EDEADLK):
2785 status = nfserr_deadlock;
eb76b3fd 2786 break;
1da177e4 2787 default:
fd85b817 2788 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2789 status = nfserr_resource;
2790 break;
1da177e4 2791 }
1da177e4 2792out:
8a280510
BF		 2793 if (status && lock->lk_is_new && lock_sop)
2794 release_stateowner(lock_sop);
3a65588a
BF		 2795 if (lock->lk_replay_owner) {
2796 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2797 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2798 }
1da177e4
LT		 2799 nfs4_unlock_state();
2800 return status;
2801}
2802
2803/*
2804 * LOCKT operation
2805 */
b37ad28b 2806__be32
ca364317
BF		 2807nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2808 struct nfsd4_lockt *lockt)
1da177e4
LT		 2809{
2810 struct inode *inode;
2811 struct file file;
2812 struct file_lock file_lock;
fd85b817 2813 int error;
b37ad28b 2814 __be32 status;
1da177e4
LT		 2815
2816 if (nfs4_in_grace())
2817 return nfserr_grace;
2818
2819 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2820 return nfserr_inval;
2821
2822 lockt->lt_stateowner = NULL;
2823 nfs4_lock_state();
2824
2825 status = nfserr_stale_clientid;
849823c5 2826 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2827 goto out;
1da177e4 2828
ca364317 2829 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2830 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2831 if (status == nfserr_symlink)
2832 status = nfserr_inval;
2833 goto out;
2834 }
2835
ca364317 2836 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2837 locks_init_lock(&file_lock);
2838 switch (lockt->lt_type) {
2839 case NFS4_READ_LT:
2840 case NFS4_READW_LT:
2841 file_lock.fl_type = F_RDLCK;
2842 break;
2843 case NFS4_WRITE_LT:
2844 case NFS4_WRITEW_LT:
2845 file_lock.fl_type = F_WRLCK;
2846 break;
2847 default:
2fdada03 2848 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2849 status = nfserr_inval;
2850 goto out;
2851 }
2852
2853 lockt->lt_stateowner = find_lockstateowner_str(inode,
2854 &lockt->lt_clientid, &lockt->lt_owner);
2855 if (lockt->lt_stateowner)
2856 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2857 file_lock.fl_pid = current->tgid;
2858 file_lock.fl_flags = FL_POSIX;
d5b9026a 2859 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2860
2861 file_lock.fl_start = lockt->lt_offset;
2862 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2863 file_lock.fl_end = ~(u64)0;
2864 else
2865 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2866
2867 nfs4_transform_lock_offset(&file_lock);
2868
fd85b817 2869 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2870 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2871 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2872 * only the dentry:inode set.
2873 */
2874 memset(&file, 0, sizeof (struct file));
ca364317 2875 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2876
2877 status = nfs_ok;
fd85b817
ME		 2878 error = vfs_test_lock(&file, &file_lock);
2879 if (error) {
2880 status = nfserrno(error);
2881 goto out;
2882 }
9d6a8c5c 2883 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2884 status = nfserr_denied;
9d6a8c5c 2885 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2886 }
2887out:
2888 nfs4_unlock_state();
2889 return status;
2890}
2891
b37ad28b 2892__be32
ca364317 2893nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2894 struct nfsd4_locku *locku)
1da177e4
LT		 2895{
2896 struct nfs4_stateid *stp;
2897 struct file *filp = NULL;
2898 struct file_lock file_lock;
b37ad28b 2899 __be32 status;
b8dd7b9a 2900 int err;
1da177e4
LT		 2901
2902 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2903 (long long) locku->lu_offset,
2904 (long long) locku->lu_length);
2905
2906 if (check_lock_length(locku->lu_offset, locku->lu_length))
2907 return nfserr_inval;
2908
2909 nfs4_lock_state();
2910
ca364317 2911 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2912 locku->lu_seqid,
2913 &locku->lu_stateid,
2914 CHECK_FH | LOCK_STATE,
2915 &locku->lu_stateowner, &stp, NULL)))
2916 goto out;
2917
2918 filp = stp->st_vfs_file;
2919 BUG_ON(!filp);
2920 locks_init_lock(&file_lock);
2921 file_lock.fl_type = F_UNLCK;
2922 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2923 file_lock.fl_pid = current->tgid;
2924 file_lock.fl_file = filp;
2925 file_lock.fl_flags = FL_POSIX;
d5b9026a 2926 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2927 file_lock.fl_start = locku->lu_offset;
2928
2929 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2930 file_lock.fl_end = ~(u64)0;
2931 else
2932 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2933 nfs4_transform_lock_offset(&file_lock);
2934
2935 /*
2936 * Try to unlock the file in the VFS.
2937 */
fd85b817 2938 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2939 if (err) {
fd85b817 2940 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2941 goto out_nfserr;
2942 }
2943 /*
2944 * OK, unlock succeeded; the only thing left to do is update the stateid.
2945 */
2946 update_stateid(&stp->st_stateid);
2947 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2948
2949out:
f2327d9a 2950 if (locku->lu_stateowner) {
1da177e4 2951 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2952 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2953 }
1da177e4
LT		 2954 nfs4_unlock_state();
2955 return status;
2956
2957out_nfserr:
b8dd7b9a 2958 status = nfserrno(err);
1da177e4
LT		 2959 goto out;
2960}
2961
2962/*
2963 * returns
2964 * 1: locks held by lockowner
2965 * 0: no locks held by lockowner
2966 */
2967static int
2968check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2969{
2970 struct file_lock **flpp;
7eaa36e2 2971 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2972 int status = 0;
2973
2974 lock_kernel();
2975 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2976 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2977 status = 1;
2978 goto out;
796dadfd 2979 }
1da177e4
LT		 2980 }
2981out:
2982 unlock_kernel();
2983 return status;
2984}
2985
b37ad28b 2986__be32
b591480b
BF		 2987nfsd4_release_lockowner(struct svc_rqst *rqstp,
2988 struct nfsd4_compound_state *cstate,
2989 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2990{
2991 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2992 struct nfs4_stateowner *sop;
2993 struct nfs4_stateid *stp;
1da177e4 2994 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2995 struct list_head matches;
2996 int i;
b37ad28b 2997 __be32 status;
1da177e4
LT		 2998
2999 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3000 clid->cl_boot, clid->cl_id);
3001
3002 /* XXX check for lease expiration */
3003
3004 status = nfserr_stale_clientid;
849823c5 3005 if (STALE_CLIENTID(clid))
1da177e4 3006 return status;
1da177e4
LT		 3007
3008 nfs4_lock_state();
3009
3e9e3dbe
N		 3010 status = nfserr_locks_held;
3011 /* XXX: we're doing a linear search through all the lockowners.
3012 * Yipes! For now we'll just hope clients aren't really using
3013 * release_lockowner much, but eventually we have to fix these
3014 * data structures. */
3015 INIT_LIST_HEAD(&matches);
3016 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3017 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 3018 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 3019 continue;
3020 list_for_each_entry(stp, &sop->so_stateids,
3021 st_perstateowner) {
3022 if (check_for_locks(stp->st_vfs_file, sop))
3023 goto out;
3024 /* Note: so_perclient unused for lockowners,
3025 * so it's OK to fool with here. */
3026 list_add(&sop->so_perclient, &matches);
3027 }
1da177e4 3028 }
3e9e3dbe
N		 3029 }
3030 /* Clients probably won't expect us to return with some (but not all)
3031 * of the lockowner state released; so don't release any until all
3032 * have been checked. */
3033 status = nfs_ok;
0fa822e4
N		 3034 while (!list_empty(&matches)) {
3035 sop = list_entry(matches.next, struct nfs4_stateowner,
3036 so_perclient);
3037 /* unhash_stateowner deletes so_perclient only
3038 * for openowners. */
3039 list_del(&sop->so_perclient);
3e9e3dbe 3040 release_stateowner(sop);
1da177e4
LT		 3041 }
3042out:
3043 nfs4_unlock_state();
3044 return status;
3045}
3046
3047static inline struct nfs4_client_reclaim *
a55370a3 3048alloc_reclaim(void)
1da177e4 3049{
a55370a3 3050 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3051}
3052
c7b9a459
N		 3053int
3054nfs4_has_reclaimed_state(const char *name)
3055{
3056 unsigned int strhashval = clientstr_hashval(name);
3057 struct nfs4_client *clp;
3058
3059 clp = find_confirmed_client_by_str(name, strhashval);
3060 return clp ? 1 : 0;
3061}
3062
1da177e4
LT		 3063/*
3064 * failure => all reset bets are off, nfserr_no_grace...
3065 */
190e4fbf
N		 3066int
3067nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3068{
3069 unsigned int strhashval;
3070 struct nfs4_client_reclaim *crp = NULL;
3071
a55370a3
N		 3072 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3073 crp = alloc_reclaim();
1da177e4
LT		 3074 if (!crp)
3075 return 0;
a55370a3 3076 strhashval = clientstr_hashval(name);
1da177e4
LT		 3077 INIT_LIST_HEAD(&crp->cr_strhash);
3078 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3079 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3080 reclaim_str_hashtbl_size++;
3081 return 1;
3082}
3083
3084static void
3085nfs4_release_reclaim(void)
3086{
3087 struct nfs4_client_reclaim *crp = NULL;
3088 int i;
3089
1da177e4
LT		 3090 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3091 while (!list_empty(&reclaim_str_hashtbl[i])) {
3092 crp = list_entry(reclaim_str_hashtbl[i].next,
3093 struct nfs4_client_reclaim, cr_strhash);
3094 list_del(&crp->cr_strhash);
1da177e4
LT		 3095 kfree(crp);
3096 reclaim_str_hashtbl_size--;
3097 }
3098 }
3099 BUG_ON(reclaim_str_hashtbl_size);
3100}
3101
3102/*
3103 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3104static struct nfs4_client_reclaim *
1da177e4
LT		 3105nfs4_find_reclaim_client(clientid_t *clid)
3106{
3107 unsigned int strhashval;
3108 struct nfs4_client *clp;
3109 struct nfs4_client_reclaim *crp = NULL;
3110
3111
3112 /* find clientid in conf_id_hashtbl */
3113 clp = find_confirmed_client(clid);
3114 if (clp == NULL)
3115 return NULL;
3116
a55370a3
N		 3117 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3118 clp->cl_name.len, clp->cl_name.data,
3119 clp->cl_recdir);
1da177e4
LT		 3120
3121 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3122 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3123 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3124 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3125 return crp;
3126 }
3127 }
3128 return NULL;
3129}
3130
3131/*
3132* Called from OPEN. Look for clientid in reclaim list.
3133*/
b37ad28b 3134__be32
1da177e4
LT		 3135nfs4_check_open_reclaim(clientid_t *clid)
3136{
dfc83565 3137 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3138}
3139
ac4d8ff2 3140/* initialization to perform at module load time: */
1da177e4 3141
e8ff2a84 3142int
ac4d8ff2 3143nfs4_state_init(void)
1da177e4 3144{
e8ff2a84 3145 int i, status;
1da177e4 3146
e8ff2a84
BF		 3147 status = nfsd4_init_slabs();
3148 if (status)
3149 return status;
1da177e4
LT		 3150 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3151 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3152 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3153 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3154 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3155 }
3156 for (i = 0; i < FILE_HASH_SIZE; i++) {
3157 INIT_LIST_HEAD(&file_hashtbl[i]);
3158 }
3159 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3160 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3161 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3162 }
3163 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3164 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3165 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3166 }
3167 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3168 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3169 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3170 }
1da177e4 3171 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3172 INIT_LIST_HEAD(&close_lru);
3173 INIT_LIST_HEAD(&client_lru);
3174 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3175 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3176 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3177 reclaim_str_hashtbl_size = 0;
e8ff2a84 3178 return 0;
ac4d8ff2
N		 3179}
3180
190e4fbf
N		 3181static void
3182nfsd4_load_reboot_recovery_data(void)
3183{
3184 int status;
3185
0964a3d3
N		 3186 nfs4_lock_state();
3187 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3188 status = nfsd4_recdir_load();
0964a3d3 3189 nfs4_unlock_state();
190e4fbf
N		 3190 if (status)
3191 printk("NFSD: Failure reading reboot recovery data\n");
3192}
3193
9a8db97e
ME		 3194unsigned long
3195get_nfs4_grace_period(void)
3196{
3197 return max(user_lease_time, lease_time) * HZ;
3198}
3199
c2f1a551
MS		 3200/*
3201 * Since the lifetime of a delegation isn't limited to that of an open, a
3202 * client may quite reasonably hang on to a delegation as long as it has
3203 * the inode cached. This becomes an obvious problem the first time a
3204 * client's inode cache approaches the size of the server's total memory.
3205 *
3206 * For now we avoid this problem by imposing a hard limit on the number
3207 * of delegations, which varies according to the server's memory size.
3208 */
3209static void
3210set_max_delegations(void)
3211{
3212 /*
3213 * Allow at most 4 delegations per megabyte of RAM. Quick
3214 * estimates suggest that in the worst case (where every delegation
3215 * is for a different inode), a delegation could take about 1.5K,
3216 * giving a worst case usage of about 6% of memory.
3217 */
3218 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3219}
3220
ac4d8ff2
N		 3221/* initialization to perform when the nfsd service is started: */
3222
3223static void
3224__nfs4_state_start(void)
3225{
9a8db97e 3226 unsigned long grace_time;
ac4d8ff2 3227
1da177e4 3228 boot_time = get_seconds();
9a8db97e 3229 grace_time = get_nfs_grace_period();
d99a05ad 3230 lease_time = user_lease_time;
a76b4319 3231 in_grace = 1;
9a8db97e
ME		 3232 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3233 grace_time/HZ);
58da282b 3234 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3235 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3236 set_max_delegations();
1da177e4
LT		 3237}
3238
e8ff2a84 3239void
76a3550e 3240nfs4_state_start(void)
1da177e4 3241{
1da177e4 3242 if (nfs4_init)
e8ff2a84 3243 return;
190e4fbf 3244 nfsd4_load_reboot_recovery_data();
76a3550e 3245 __nfs4_state_start();
1da177e4 3246 nfs4_init = 1;
e8ff2a84 3247 return;
1da177e4
LT		 3248}
3249
3250int
3251nfs4_in_grace(void)
3252{
a76b4319 3253 return in_grace;
1da177e4
LT		 3254}
3255
3256time_t
3257nfs4_lease_time(void)
3258{
3259 return lease_time;
3260}
3261
3262static void
3263__nfs4_state_shutdown(void)
3264{
3265 int i;
3266 struct nfs4_client *clp = NULL;
3267 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3268 struct list_head *pos, *next, reaplist;
3269
1da177e4
LT		 3270 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3271 while (!list_empty(&conf_id_hashtbl[i])) {
3272 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3273 expire_client(clp);
3274 }
3275 while (!list_empty(&unconf_str_hashtbl[i])) {
3276 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3277 expire_client(clp);
3278 }
3279 }
3280 INIT_LIST_HEAD(&reaplist);
3281 spin_lock(&recall_lock);
3282 list_for_each_safe(pos, next, &del_recall_lru) {
3283 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3284 list_move(&dp->dl_recall_lru, &reaplist);
3285 }
3286 spin_unlock(&recall_lock);
3287 list_for_each_safe(pos, next, &reaplist) {
3288 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3289 list_del_init(&dp->dl_recall_lru);
3290 unhash_delegation(dp);
3291 }
3292
190e4fbf 3293 nfsd4_shutdown_recdir();
1da177e4 3294 nfs4_init = 0;
1da177e4
LT		 3295}
3296
3297void
3298nfs4_state_shutdown(void)
3299{
5e8d5c29
N		 3300 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3301 destroy_workqueue(laundry_wq);
1da177e4
LT		 3302 nfs4_lock_state();
3303 nfs4_release_reclaim();
3304 __nfs4_state_shutdown();
1da177e4
LT		 3305 nfs4_unlock_state();
3306}
3307
0964a3d3
N		 3308static void
3309nfs4_set_recdir(char *recdir)
3310{
3311 nfs4_lock_state();
3312 strcpy(user_recovery_dirname, recdir);
3313 nfs4_unlock_state();
3314}
3315
3316/*
3317 * Change the NFSv4 recovery directory to recdir.
3318 */
3319int
3320nfs4_reset_recoverydir(char *recdir)
3321{
3322 int status;
3323 struct nameidata nd;
3324
3325 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3326 if (status)
3327 return status;
3328 status = -ENOTDIR;
3329 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3330 nfs4_set_recdir(recdir);
3331 status = 0;
3332 }
3333 path_release(&nd);
3334 return status;
3335}
3336
1da177e4
LT		 3337/*
3338 * Called when leasetime is changed.
3339 *
d99a05ad
N		 3340 * The only way the protocol gives us to handle on-the-fly lease changes is to
3341 * simulate a reboot. Instead of doing that, we just wait till the next time
3342 * we start to register any changes in lease time. If the administrator
3343 * really wants to change the lease time *now*, they can go ahead and bring
3344 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3345 */
3346void
3347nfs4_reset_lease(time_t leasetime)
3348{
d99a05ad
N		 3349 lock_kernel();
3350 user_lease_time = leasetime;
3351 unlock_kernel();
1da177e4 3352}
Linux 6.x block layer and io_uring tree(s)