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knfsd: nfsd: remove unused header interface.h
[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>
353ab6e9 52#include <linux/mutex.h>
fd85b817 53#include <linux/lockd/bind.h>
9a8db97e 54#include <linux/module.h>
1da177e4
LT		 55
56#define NFSDDBG_FACILITY NFSDDBG_PROC
57
58/* Globals */
59static time_t lease_time = 90; /* default lease time */
d99a05ad 60static time_t user_lease_time = 90;
fd39ca9a 61static time_t boot_time;
a76b4319 62static int in_grace = 1;
1da177e4
LT		 63static u32 current_clientid = 1;
64static u32 current_ownerid = 1;
65static u32 current_fileid = 1;
66static u32 current_delegid = 1;
67static u32 nfs4_init;
fd39ca9a
N		 68static stateid_t zerostateid; /* bits all 0 */
69static stateid_t onestateid; /* bits all 1 */
70
71#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
72#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 73
1da177e4 74/* forward declarations */
fd39ca9a 75static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 76static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
77static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 78static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 80
81/* Locking:
82 *
353ab6e9 83 * client_mutex:
1da177e4
LT		 84 * protects clientid_hashtbl[], clientstr_hashtbl[],
85 * unconfstr_hashtbl[], uncofid_hashtbl[].
86 */
353ab6e9 87static DEFINE_MUTEX(client_mutex);
1da177e4 88
e18b890b
CL		 89static struct kmem_cache *stateowner_slab = NULL;
90static struct kmem_cache *file_slab = NULL;
91static struct kmem_cache *stateid_slab = NULL;
92static struct kmem_cache *deleg_slab = NULL;
e60d4398 93
1da177e4
LT		 94void
95nfs4_lock_state(void)
96{
353ab6e9 97 mutex_lock(&client_mutex);
1da177e4
LT		 98}
99
100void
101nfs4_unlock_state(void)
102{
353ab6e9 103 mutex_unlock(&client_mutex);
1da177e4
LT		 104}
105
106static inline u32
107opaque_hashval(const void *ptr, int nbytes)
108{
109 unsigned char *cptr = (unsigned char *) ptr;
110
111 u32 x = 0;
112 while (nbytes--) {
113 x *= 37;
114 x += *cptr++;
115 }
116 return x;
117}
118
119/* forward declarations */
120static void release_stateowner(struct nfs4_stateowner *sop);
121static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
34af946a 128static DEFINE_SPINLOCK(recall_lock);
1da177e4
LT		 129static struct list_head del_recall_lru;
130
13cd2184
N		 131static void
132free_nfs4_file(struct kref *kref)
133{
134 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
135 list_del(&fp->fi_hash);
136 iput(fp->fi_inode);
137 kmem_cache_free(file_slab, fp);
138}
139
140static inline void
141put_nfs4_file(struct nfs4_file *fi)
142{
143 kref_put(&fi->fi_ref, free_nfs4_file);
144}
145
146static inline void
147get_nfs4_file(struct nfs4_file *fi)
148{
149 kref_get(&fi->fi_ref);
150}
151
ef0f3390
N		 152static int num_delegations;
153
154/*
155 * Open owner state (share locks)
156 */
157
158/* hash tables for nfs4_stateowner */
159#define OWNER_HASH_BITS 8
160#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
161#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
162
163#define ownerid_hashval(id) \
164 ((id) & OWNER_HASH_MASK)
165#define ownerstr_hashval(clientid, ownername) \
166 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
167
168static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
169static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
170
171/* hash table for nfs4_file */
172#define FILE_HASH_BITS 8
173#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
174#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
175/* hash table for (open)nfs4_stateid */
176#define STATEID_HASH_BITS 10
177#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
178#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
179
180#define file_hashval(x) \
181 hash_ptr(x, FILE_HASH_BITS)
182#define stateid_hashval(owner_id, file_id) \
183 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
184
185static struct list_head file_hashtbl[FILE_HASH_SIZE];
186static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
187
1da177e4
LT		 188static struct nfs4_delegation *
189alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
190{
191 struct nfs4_delegation *dp;
192 struct nfs4_file *fp = stp->st_file;
193 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
194
195 dprintk("NFSD alloc_init_deleg\n");
ef0f3390
N		 196 if (num_delegations > STATEID_HASH_SIZE * 4)
197 return NULL;
5b2d21c1
N		 198 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
199 if (dp == NULL)
1da177e4 200 return dp;
ef0f3390 201 num_delegations++;
ea1da636
N		 202 INIT_LIST_HEAD(&dp->dl_perfile);
203 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 204 INIT_LIST_HEAD(&dp->dl_recall_lru);
205 dp->dl_client = clp;
13cd2184 206 get_nfs4_file(fp);
1da177e4
LT		 207 dp->dl_file = fp;
208 dp->dl_flock = NULL;
209 get_file(stp->st_vfs_file);
210 dp->dl_vfs_file = stp->st_vfs_file;
211 dp->dl_type = type;
212 dp->dl_recall.cbr_dp = NULL;
213 dp->dl_recall.cbr_ident = cb->cb_ident;
214 dp->dl_recall.cbr_trunc = 0;
215 dp->dl_stateid.si_boot = boot_time;
216 dp->dl_stateid.si_stateownerid = current_delegid++;
217 dp->dl_stateid.si_fileid = 0;
218 dp->dl_stateid.si_generation = 0;
219 dp->dl_fhlen = current_fh->fh_handle.fh_size;
220 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
221 current_fh->fh_handle.fh_size);
222 dp->dl_time = 0;
223 atomic_set(&dp->dl_count, 1);
ea1da636
N		 224 list_add(&dp->dl_perfile, &fp->fi_delegations);
225 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 226 return dp;
227}
228
229void
230nfs4_put_delegation(struct nfs4_delegation *dp)
231{
232 if (atomic_dec_and_test(&dp->dl_count)) {
233 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 234 put_nfs4_file(dp->dl_file);
5b2d21c1 235 kmem_cache_free(deleg_slab, dp);
ef0f3390 236 num_delegations--;
1da177e4
LT		 237 }
238}
239
240/* Remove the associated file_lock first, then remove the delegation.
241 * lease_modify() is called to remove the FS_LEASE file_lock from
242 * the i_flock list, eventually calling nfsd's lock_manager
243 * fl_release_callback.
244 */
245static void
246nfs4_close_delegation(struct nfs4_delegation *dp)
247{
248 struct file *filp = dp->dl_vfs_file;
249
250 dprintk("NFSD: close_delegation dp %p\n",dp);
251 dp->dl_vfs_file = NULL;
252 /* The following nfsd_close may not actually close the file,
253 * but we want to remove the lease in any case. */
c907132d
N		 254 if (dp->dl_flock)
255 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 256 nfsd_close(filp);
1da177e4
LT		 257}
258
259/* Called under the state lock. */
260static void
261unhash_delegation(struct nfs4_delegation *dp)
262{
ea1da636
N		 263 list_del_init(&dp->dl_perfile);
264 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 265 spin_lock(&recall_lock);
266 list_del_init(&dp->dl_recall_lru);
267 spin_unlock(&recall_lock);
268 nfs4_close_delegation(dp);
269 nfs4_put_delegation(dp);
270}
271
272/*
273 * SETCLIENTID state
274 */
275
276/* Hash tables for nfs4_clientid state */
277#define CLIENT_HASH_BITS 4
278#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
279#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
280
281#define clientid_hashval(id) \
282 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 283#define clientstr_hashval(name) \
284 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 285/*
286 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
287 * used in reboot/reset lease grace period processing
288 *
289 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
290 * setclientid_confirmed info.
291 *
292 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
293 * setclientid info.
294 *
295 * client_lru holds client queue ordered by nfs4_client.cl_time
296 * for lease renewal.
297 *
298 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
299 * for last close replay.
300 */
301static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
302static int reclaim_str_hashtbl_size = 0;
303static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
304static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
305static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
306static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
307static struct list_head client_lru;
308static struct list_head close_lru;
309
310static inline void
311renew_client(struct nfs4_client *clp)
312{
313 /*
314 * Move client to the end to the LRU list.
315 */
316 dprintk("renewing client (clientid %08x/%08x)\n",
317 clp->cl_clientid.cl_boot,
318 clp->cl_clientid.cl_id);
319 list_move_tail(&clp->cl_lru, &client_lru);
320 clp->cl_time = get_seconds();
321}
322
323/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
324static int
325STALE_CLIENTID(clientid_t *clid)
326{
327 if (clid->cl_boot == boot_time)
328 return 0;
329 dprintk("NFSD stale clientid (%08x/%08x)\n",
330 clid->cl_boot, clid->cl_id);
331 return 1;
332}
333
334/*
335 * XXX Should we use a slab cache ?
336 * This type of memory management is somewhat inefficient, but we use it
337 * anyway since SETCLIENTID is not a common operation.
338 */
339static inline struct nfs4_client *
340alloc_client(struct xdr_netobj name)
341{
342 struct nfs4_client *clp;
343
f8314dc6 344 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
1da177e4
LT		 345 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
346 memcpy(clp->cl_name.data, name.data, name.len);
347 clp->cl_name.len = name.len;
348 }
349 else {
350 kfree(clp);
351 clp = NULL;
352 }
353 }
354 return clp;
355}
356
357static inline void
358free_client(struct nfs4_client *clp)
359{
360 if (clp->cl_cred.cr_group_info)
361 put_group_info(clp->cl_cred.cr_group_info);
362 kfree(clp->cl_name.data);
363 kfree(clp);
364}
365
366void
367put_nfs4_client(struct nfs4_client *clp)
368{
369 if (atomic_dec_and_test(&clp->cl_count))
370 free_client(clp);
371}
372
4e2fd495
N		 373static void
374shutdown_callback_client(struct nfs4_client *clp)
375{
376 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
377
378 /* shutdown rpc client, ending any outstanding recall rpcs */
379 if (clnt) {
380 clp->cl_callback.cb_client = NULL;
381 rpc_shutdown_client(clnt);
4e2fd495
N		 382 }
383}
384
1da177e4
LT		 385static void
386expire_client(struct nfs4_client *clp)
387{
388 struct nfs4_stateowner *sop;
389 struct nfs4_delegation *dp;
1da177e4
LT		 390 struct list_head reaplist;
391
392 dprintk("NFSD: expire_client cl_count %d\n",
393 atomic_read(&clp->cl_count));
394
4e2fd495 395 shutdown_callback_client(clp);
1da177e4
LT		 396
397 INIT_LIST_HEAD(&reaplist);
398 spin_lock(&recall_lock);
ea1da636
N		 399 while (!list_empty(&clp->cl_delegations)) {
400 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 401 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
402 dp->dl_flock);
ea1da636 403 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 404 list_move(&dp->dl_recall_lru, &reaplist);
405 }
406 spin_unlock(&recall_lock);
407 while (!list_empty(&reaplist)) {
408 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
409 list_del_init(&dp->dl_recall_lru);
410 unhash_delegation(dp);
411 }
412 list_del(&clp->cl_idhash);
413 list_del(&clp->cl_strhash);
414 list_del(&clp->cl_lru);
ea1da636
N		 415 while (!list_empty(&clp->cl_openowners)) {
416 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 417 release_stateowner(sop);
418 }
419 put_nfs4_client(clp);
420}
421
422static struct nfs4_client *
a55370a3 423create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 424 struct nfs4_client *clp;
425
426 if (!(clp = alloc_client(name)))
427 goto out;
a55370a3 428 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 429 atomic_set(&clp->cl_count, 1);
430 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 431 INIT_LIST_HEAD(&clp->cl_idhash);
432 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 433 INIT_LIST_HEAD(&clp->cl_openowners);
434 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 435 INIT_LIST_HEAD(&clp->cl_lru);
436out:
437 return clp;
438}
439
440static void
441copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
442 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
443}
444
445static void
446copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
447 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
448 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
449}
450
451static void
452copy_cred(struct svc_cred *target, struct svc_cred *source) {
453
454 target->cr_uid = source->cr_uid;
455 target->cr_gid = source->cr_gid;
456 target->cr_group_info = source->cr_group_info;
457 get_group_info(target->cr_group_info);
458}
459
a55370a3
N		 460static inline int
461same_name(const char *n1, const char *n2) {
462 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 463}
464
465static int
466cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
467 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
468}
469
470static int
471cmp_clid(clientid_t * cl1, clientid_t * cl2) {
472 return((cl1->cl_boot == cl2->cl_boot) &&
473 (cl1->cl_id == cl2->cl_id));
474}
475
476/* XXX what about NGROUP */
477static int
478cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
479 return(cr1->cr_uid == cr2->cr_uid);
480
481}
482
483static void
484gen_clid(struct nfs4_client *clp) {
485 clp->cl_clientid.cl_boot = boot_time;
486 clp->cl_clientid.cl_id = current_clientid++;
487}
488
489static void
490gen_confirm(struct nfs4_client *clp) {
491 struct timespec tv;
492 u32 * p;
493
494 tv = CURRENT_TIME;
495 p = (u32 *)clp->cl_confirm.data;
496 *p++ = tv.tv_sec;
497 *p++ = tv.tv_nsec;
498}
499
500static int
501check_name(struct xdr_netobj name) {
502
503 if (name.len == 0)
504 return 0;
505 if (name.len > NFS4_OPAQUE_LIMIT) {
506 printk("NFSD: check_name: name too long(%d)!\n", name.len);
507 return 0;
508 }
509 return 1;
510}
511
fd39ca9a 512static void
1da177e4
LT		 513add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
514{
515 unsigned int idhashval;
516
517 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
518 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
519 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
520 list_add_tail(&clp->cl_lru, &client_lru);
521 clp->cl_time = get_seconds();
522}
523
fd39ca9a 524static void
1da177e4
LT		 525move_to_confirmed(struct nfs4_client *clp)
526{
527 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
528 unsigned int strhashval;
529
530 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
531 list_del_init(&clp->cl_strhash);
f116629d 532 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 533 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 534 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
535 renew_client(clp);
536}
537
538static struct nfs4_client *
539find_confirmed_client(clientid_t *clid)
540{
541 struct nfs4_client *clp;
542 unsigned int idhashval = clientid_hashval(clid->cl_id);
543
544 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
545 if (cmp_clid(&clp->cl_clientid, clid))
546 return clp;
547 }
548 return NULL;
549}
550
551static struct nfs4_client *
552find_unconfirmed_client(clientid_t *clid)
553{
554 struct nfs4_client *clp;
555 unsigned int idhashval = clientid_hashval(clid->cl_id);
556
557 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
558 if (cmp_clid(&clp->cl_clientid, clid))
559 return clp;
560 }
561 return NULL;
562}
563
28ce6054
N		 564static struct nfs4_client *
565find_confirmed_client_by_str(const char *dname, unsigned int hashval)
566{
567 struct nfs4_client *clp;
568
569 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
570 if (same_name(clp->cl_recdir, dname))
571 return clp;
572 }
573 return NULL;
574}
575
576static struct nfs4_client *
577find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
578{
579 struct nfs4_client *clp;
580
581 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
582 if (same_name(clp->cl_recdir, dname))
583 return clp;
584 }
585 return NULL;
586}
587
1da177e4
LT		 588/* a helper function for parse_callback */
589static int
590parse_octet(unsigned int *lenp, char **addrp)
591{
592 unsigned int len = *lenp;
593 char *p = *addrp;
594 int n = -1;
595 char c;
596
597 for (;;) {
598 if (!len)
599 break;
600 len--;
601 c = *p++;
602 if (c == '.')
603 break;
604 if ((c < '0') || (c > '9')) {
605 n = -1;
606 break;
607 }
608 if (n < 0)
609 n = 0;
610 n = (n * 10) + (c - '0');
611 if (n > 255) {
612 n = -1;
613 break;
614 }
615 }
616 *lenp = len;
617 *addrp = p;
618 return n;
619}
620
621/* parse and set the setclientid ipv4 callback address */
fd39ca9a 622static int
1da177e4
LT		 623parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
624{
625 int temp = 0;
626 u32 cbaddr = 0;
627 u16 cbport = 0;
628 u32 addrlen = addr_len;
629 char *addr = addr_val;
630 int i, shift;
631
632 /* ipaddress */
633 shift = 24;
634 for(i = 4; i > 0 ; i--) {
635 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
636 return 0;
637 }
638 cbaddr |= (temp << shift);
639 if (shift > 0)
640 shift -= 8;
641 }
642 *cbaddrp = cbaddr;
643
644 /* port */
645 shift = 8;
646 for(i = 2; i > 0 ; i--) {
647 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
648 return 0;
649 }
650 cbport |= (temp << shift);
651 if (shift > 0)
652 shift -= 8;
653 }
654 *cbportp = cbport;
655 return 1;
656}
657
fd39ca9a 658static void
1da177e4
LT		 659gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
660{
661 struct nfs4_callback *cb = &clp->cl_callback;
662
663 /* Currently, we only support tcp for the callback channel */
664 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
665 goto out_err;
666
667 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
668 &cb->cb_addr, &cb->cb_port)))
669 goto out_err;
670 cb->cb_prog = se->se_callback_prog;
671 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 672 return;
673out_err:
849823c5 674 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 675 "will not receive delegations\n",
676 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
677
1da177e4
LT		 678 return;
679}
680
681/*
682 * RFC 3010 has a complex implmentation description of processing a
683 * SETCLIENTID request consisting of 5 bullets, labeled as
684 * CASE0 - CASE4 below.
685 *
686 * NOTES:
687 * callback information will be processed in a future patch
688 *
689 * an unconfirmed record is added when:
690 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
691 * CASE 1: confirmed record found with matching name, principal,
692 * verifier, and clientid.
693 * CASE 2: confirmed record found with matching name, principal,
694 * and there is no unconfirmed record with matching
695 * name and principal
696 *
697 * an unconfirmed record is replaced when:
698 * CASE 3: confirmed record found with matching name, principal,
699 * and an unconfirmed record is found with matching
700 * name, principal, and with clientid and
701 * confirm that does not match the confirmed record.
702 * CASE 4: there is no confirmed record with matching name and
703 * principal. there is an unconfirmed record with
704 * matching name, principal.
705 *
706 * an unconfirmed record is deleted when:
707 * CASE 1: an unconfirmed record that matches input name, verifier,
708 * and confirmed clientid.
709 * CASE 4: any unconfirmed records with matching name and principal
710 * that exist after an unconfirmed record has been replaced
711 * as described above.
712 *
713 */
b37ad28b 714__be32
b591480b
BF		 715nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
716 struct nfsd4_setclientid *setclid)
1da177e4 717{
27459f09 718 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 719 struct xdr_netobj clname = {
720 .len = setclid->se_namelen,
721 .data = setclid->se_name,
722 };
723 nfs4_verifier clverifier = setclid->se_verf;
724 unsigned int strhashval;
28ce6054 725 struct nfs4_client *conf, *unconf, *new;
b37ad28b 726 __be32 status;
a55370a3 727 char dname[HEXDIR_LEN];
1da177e4 728
1da177e4 729 if (!check_name(clname))
73aea4ec 730 return nfserr_inval;
1da177e4 731
a55370a3
N		 732 status = nfs4_make_rec_clidname(dname, &clname);
733 if (status)
73aea4ec 734 return status;
a55370a3 735
1da177e4
LT		 736 /*
737 * XXX The Duplicate Request Cache (DRC) has been checked (??)
738 * We get here on a DRC miss.
739 */
740
a55370a3 741 strhashval = clientstr_hashval(dname);
1da177e4 742
1da177e4 743 nfs4_lock_state();
28ce6054
N		 744 conf = find_confirmed_client_by_str(dname, strhashval);
745 if (conf) {
1da177e4
LT		 746 /*
747 * CASE 0:
748 * clname match, confirmed, different principal
749 * or different ip_address
750 */
751 status = nfserr_clid_inuse;
28ce6054 752 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 753 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 754 dprintk("NFSD: setclientid: string in use by client"
755 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 756 goto out;
757 }
1da177e4 758 }
28ce6054 759 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 760 status = nfserr_resource;
761 if (!conf) {
762 /*
763 * CASE 4:
764 * placed first, because it is the normal case.
765 */
766 if (unconf)
767 expire_client(unconf);
a55370a3
N		 768 new = create_client(clname, dname);
769 if (new == NULL)
1da177e4
LT		 770 goto out;
771 copy_verf(new, &clverifier);
27459f09 772 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 773 copy_cred(&new->cl_cred,&rqstp->rq_cred);
774 gen_clid(new);
775 gen_confirm(new);
776 gen_callback(new, setclid);
777 add_to_unconfirmed(new, strhashval);
778 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
779 /*
780 * CASE 1:
781 * cl_name match, confirmed, principal match
782 * verifier match: probable callback update
783 *
784 * remove any unconfirmed nfs4_client with
785 * matching cl_name, cl_verifier, and cl_clientid
786 *
787 * create and insert an unconfirmed nfs4_client with same
788 * cl_name, cl_verifier, and cl_clientid as existing
789 * nfs4_client, but with the new callback info and a
790 * new cl_confirm
791 */
31f4a6c1
N		 792 if (unconf) {
793 /* Note this is removing unconfirmed {*x***},
794 * which is stronger than RFC recommended {vxc**}.
795 * This has the advantage that there is at most
796 * one {*x***} in either list at any time.
797 */
798 expire_client(unconf);
1da177e4 799 }
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&conf->cl_verifier);
27459f09 804 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 copy_clid(new, conf);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new,strhashval);
810 } else if (!unconf) {
811 /*
812 * CASE 2:
813 * clname match, confirmed, principal match
814 * verfier does not match
815 * no unconfirmed. create a new unconfirmed nfs4_client
816 * using input clverifier, clname, and callback info
817 * and generate a new cl_clientid and cl_confirm.
818 */
a55370a3
N		 819 new = create_client(clname, dname);
820 if (new == NULL)
1da177e4
LT		 821 goto out;
822 copy_verf(new,&clverifier);
27459f09 823 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 824 copy_cred(&new->cl_cred,&rqstp->rq_cred);
825 gen_clid(new);
826 gen_confirm(new);
827 gen_callback(new, setclid);
828 add_to_unconfirmed(new, strhashval);
829 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
830 /*
831 * CASE3:
832 * confirmed found (name, principal match)
833 * confirmed verifier does not match input clverifier
834 *
835 * unconfirmed found (name match)
836 * confirmed->cl_confirm != unconfirmed->cl_confirm
837 *
838 * remove unconfirmed.
839 *
840 * create an unconfirmed nfs4_client
841 * with same cl_name as existing confirmed nfs4_client,
842 * but with new callback info, new cl_clientid,
843 * new cl_verifier and a new cl_confirm
844 */
845 expire_client(unconf);
a55370a3
N		 846 new = create_client(clname, dname);
847 if (new == NULL)
1da177e4
LT		 848 goto out;
849 copy_verf(new,&clverifier);
27459f09 850 new->cl_addr = sin->sin_addr.s_addr;
1da177e4
LT		 851 copy_cred(&new->cl_cred,&rqstp->rq_cred);
852 gen_clid(new);
853 gen_confirm(new);
854 gen_callback(new, setclid);
855 add_to_unconfirmed(new, strhashval);
856 } else {
857 /* No cases hit !!! */
858 status = nfserr_inval;
859 goto out;
860
861 }
862 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
863 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
864 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
865 status = nfs_ok;
866out:
867 nfs4_unlock_state();
868 return status;
869}
870
871
872/*
873 * RFC 3010 has a complex implmentation description of processing a
874 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
875 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
876 *
877 * NOTE: callback information will be processed here in a future patch
878 */
b37ad28b 879__be32
b591480b
BF		 880nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
881 struct nfsd4_compound_state *cstate,
882 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 883{
27459f09 884 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 885 struct nfs4_client *conf, *unconf;
1da177e4
LT		 886 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
887 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 888 __be32 status;
1da177e4
LT		 889
890 if (STALE_CLIENTID(clid))
891 return nfserr_stale_clientid;
892 /*
893 * XXX The Duplicate Request Cache (DRC) has been checked (??)
894 * We get here on a DRC miss.
895 */
896
897 nfs4_lock_state();
21ab45a4
N		 898
899 conf = find_confirmed_client(clid);
900 unconf = find_unconfirmed_client(clid);
901
902 status = nfserr_clid_inuse;
27459f09 903 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 904 goto out;
27459f09 905 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 906 goto out;
907
1da177e4
LT		 908 if ((conf && unconf) &&
909 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
910 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 911 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 912 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 913 /* CASE 1:
914 * unconf record that matches input clientid and input confirm.
915 * conf record that matches input clientid.
916 * conf and unconf records match names, verifiers
917 */
1da177e4
LT		 918 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
919 status = nfserr_clid_inuse;
920 else {
1a69c179
N		 921 /* XXX: We just turn off callbacks until we can handle
922 * change request correctly. */
cb36d634 923 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 924 gen_confirm(conf);
46309029 925 nfsd4_remove_clid_dir(unconf);
1a69c179 926 expire_client(unconf);
1da177e4 927 status = nfs_ok;
1a69c179 928
1da177e4 929 }
7c79f737 930 } else if ((conf && !unconf) ||
1da177e4
LT		 931 ((conf && unconf) &&
932 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 933 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 934 /* CASE 2:
935 * conf record that matches input clientid.
936 * if unconf record matches input clientid, then
937 * unconf->cl_name or unconf->cl_verifier don't match the
938 * conf record.
939 */
21ab45a4 940 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 941 status = nfserr_clid_inuse;
21ab45a4 942 else
1da177e4 943 status = nfs_ok;
7c79f737
N		 944 } else if (!conf && unconf
945 && cmp_verf(&unconf->cl_confirm, &confirm)) {
946 /* CASE 3:
947 * conf record not found.
948 * unconf record found.
949 * unconf->cl_confirm matches input confirm
950 */
1da177e4
LT		 951 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
952 status = nfserr_clid_inuse;
953 } else {
1a69c179
N		 954 unsigned int hash =
955 clientstr_hashval(unconf->cl_recdir);
956 conf = find_confirmed_client_by_str(unconf->cl_recdir,
957 hash);
958 if (conf) {
c7b9a459 959 nfsd4_remove_clid_dir(conf);
1a69c179
N		 960 expire_client(conf);
961 }
1da177e4 962 move_to_confirmed(unconf);
21ab45a4 963 conf = unconf;
1a69c179 964 status = nfs_ok;
1da177e4 965 }
7c79f737
N		 966 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
967 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
968 &confirm)))) {
969 /* CASE 4:
970 * conf record not found, or if conf, conf->cl_confirm does not
971 * match input confirm.
972 * unconf record not found, or if unconf, unconf->cl_confirm
973 * does not match input confirm.
974 */
1da177e4 975 status = nfserr_stale_clientid;
7c79f737 976 } else {
08e8987c
N		 977 /* check that we have hit one of the cases...*/
978 status = nfserr_clid_inuse;
979 }
1da177e4
LT		 980out:
981 if (!status)
21ab45a4 982 nfsd4_probe_callback(conf);
1da177e4
LT		 983 nfs4_unlock_state();
984 return status;
985}
986
1da177e4
LT		 987/* OPEN Share state helper functions */
988static inline struct nfs4_file *
989alloc_init_file(struct inode *ino)
990{
991 struct nfs4_file *fp;
992 unsigned int hashval = file_hashval(ino);
993
e60d4398
N		 994 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
995 if (fp) {
13cd2184 996 kref_init(&fp->fi_ref);
1da177e4 997 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 998 INIT_LIST_HEAD(&fp->fi_stateids);
999 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 1000 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1001 fp->fi_inode = igrab(ino);
1002 fp->fi_id = current_fileid++;
1da177e4
LT		 1003 return fp;
1004 }
1005 return NULL;
1006}
1007
e60d4398 1008static void
e18b890b 1009nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 1010{
e60d4398
N		 1011 if (*slab == NULL)
1012 return;
1a1d92c1 1013 kmem_cache_destroy(*slab);
e60d4398 1014 *slab = NULL;
1da177e4
LT		 1015}
1016
1017static void
1018nfsd4_free_slabs(void)
1019{
e60d4398
N		 1020 nfsd4_free_slab(&stateowner_slab);
1021 nfsd4_free_slab(&file_slab);
5ac049ac 1022 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1023 nfsd4_free_slab(&deleg_slab);
e60d4398 1024}
1da177e4 1025
e60d4398
N		 1026static int
1027nfsd4_init_slabs(void)
1028{
1029 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1030 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1031 if (stateowner_slab == NULL)
1032 goto out_nomem;
1033 file_slab = kmem_cache_create("nfsd4_files",
1034 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1035 if (file_slab == NULL)
1036 goto out_nomem;
5ac049ac
N		 1037 stateid_slab = kmem_cache_create("nfsd4_stateids",
1038 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1039 if (stateid_slab == NULL)
1040 goto out_nomem;
5b2d21c1
N		 1041 deleg_slab = kmem_cache_create("nfsd4_delegations",
1042 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1043 if (deleg_slab == NULL)
1044 goto out_nomem;
e60d4398
N		 1045 return 0;
1046out_nomem:
1047 nfsd4_free_slabs();
1048 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1049 return -ENOMEM;
1da177e4
LT		 1050}
1051
1052void
1053nfs4_free_stateowner(struct kref *kref)
1054{
1055 struct nfs4_stateowner *sop =
1056 container_of(kref, struct nfs4_stateowner, so_ref);
1057 kfree(sop->so_owner.data);
1058 kmem_cache_free(stateowner_slab, sop);
1059}
1060
1061static inline struct nfs4_stateowner *
1062alloc_stateowner(struct xdr_netobj *owner)
1063{
1064 struct nfs4_stateowner *sop;
1065
1066 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1067 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1068 memcpy(sop->so_owner.data, owner->data, owner->len);
1069 sop->so_owner.len = owner->len;
1070 kref_init(&sop->so_ref);
1071 return sop;
1072 }
1073 kmem_cache_free(stateowner_slab, sop);
1074 }
1075 return NULL;
1076}
1077
1078static struct nfs4_stateowner *
1079alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1080 struct nfs4_stateowner *sop;
1081 struct nfs4_replay *rp;
1082 unsigned int idhashval;
1083
1084 if (!(sop = alloc_stateowner(&open->op_owner)))
1085 return NULL;
1086 idhashval = ownerid_hashval(current_ownerid);
1087 INIT_LIST_HEAD(&sop->so_idhash);
1088 INIT_LIST_HEAD(&sop->so_strhash);
1089 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1090 INIT_LIST_HEAD(&sop->so_stateids);
1091 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1092 INIT_LIST_HEAD(&sop->so_close_lru);
1093 sop->so_time = 0;
1094 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1095 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1096 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1097 sop->so_is_open_owner = 1;
1098 sop->so_id = current_ownerid++;
1099 sop->so_client = clp;
1100 sop->so_seqid = open->op_seqid;
1101 sop->so_confirmed = 0;
1102 rp = &sop->so_replay;
de1ae286 1103 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1104 rp->rp_buflen = 0;
1105 rp->rp_buf = rp->rp_ibuf;
1106 return sop;
1107}
1108
1109static void
1110release_stateid_lockowners(struct nfs4_stateid *open_stp)
1111{
1112 struct nfs4_stateowner *lock_sop;
1113
ea1da636
N		 1114 while (!list_empty(&open_stp->st_lockowners)) {
1115 lock_sop = list_entry(open_stp->st_lockowners.next,
1116 struct nfs4_stateowner, so_perstateid);
1117 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1118 BUG_ON(lock_sop->so_is_open_owner);
1119 release_stateowner(lock_sop);
1120 }
1121}
1122
1123static void
1124unhash_stateowner(struct nfs4_stateowner *sop)
1125{
1126 struct nfs4_stateid *stp;
1127
1128 list_del(&sop->so_idhash);
1129 list_del(&sop->so_strhash);
6fa305de 1130 if (sop->so_is_open_owner)
1da177e4 1131 list_del(&sop->so_perclient);
ea1da636
N		 1132 list_del(&sop->so_perstateid);
1133 while (!list_empty(&sop->so_stateids)) {
1134 stp = list_entry(sop->so_stateids.next,
1135 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1136 if (sop->so_is_open_owner)
1137 release_stateid(stp, OPEN_STATE);
1138 else
1139 release_stateid(stp, LOCK_STATE);
1140 }
1141}
1142
1143static void
1144release_stateowner(struct nfs4_stateowner *sop)
1145{
1146 unhash_stateowner(sop);
1147 list_del(&sop->so_close_lru);
1148 nfs4_put_stateowner(sop);
1149}
1150
1151static inline void
1152init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1153 struct nfs4_stateowner *sop = open->op_stateowner;
1154 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1155
1156 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1157 INIT_LIST_HEAD(&stp->st_perstateowner);
1158 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1159 INIT_LIST_HEAD(&stp->st_perfile);
1160 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1161 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1162 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1163 stp->st_stateowner = sop;
13cd2184 1164 get_nfs4_file(fp);
1da177e4
LT		 1165 stp->st_file = fp;
1166 stp->st_stateid.si_boot = boot_time;
1167 stp->st_stateid.si_stateownerid = sop->so_id;
1168 stp->st_stateid.si_fileid = fp->fi_id;
1169 stp->st_stateid.si_generation = 0;
1170 stp->st_access_bmap = 0;
1171 stp->st_deny_bmap = 0;
1172 __set_bit(open->op_share_access, &stp->st_access_bmap);
1173 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1174 stp->st_openstp = NULL;
1da177e4
LT		 1175}
1176
1177static void
1178release_stateid(struct nfs4_stateid *stp, int flags)
1179{
1180 struct file *filp = stp->st_vfs_file;
1181
1182 list_del(&stp->st_hash);
1da177e4 1183 list_del(&stp->st_perfile);
ea1da636 1184 list_del(&stp->st_perstateowner);
1da177e4
LT		 1185 if (flags & OPEN_STATE) {
1186 release_stateid_lockowners(stp);
1187 stp->st_vfs_file = NULL;
1188 nfsd_close(filp);
1da177e4
LT		 1189 } else if (flags & LOCK_STATE)
1190 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1191 put_nfs4_file(stp->st_file);
5ac049ac 1192 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1193}
1194
fd39ca9a 1195static void
1da177e4
LT		 1196move_to_close_lru(struct nfs4_stateowner *sop)
1197{
1198 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1199
358dd55a 1200 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1201 sop->so_time = get_seconds();
1202}
1203
1da177e4
LT		 1204static int
1205cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1206 return ((sop->so_owner.len == owner->len) &&
1207 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1208 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1209}
1210
1211static struct nfs4_stateowner *
1212find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1213{
1214 struct nfs4_stateowner *so = NULL;
1215
1216 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1217 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1218 return so;
1219 }
1220 return NULL;
1221}
1222
1223/* search file_hashtbl[] for file */
1224static struct nfs4_file *
1225find_file(struct inode *ino)
1226{
1227 unsigned int hashval = file_hashval(ino);
1228 struct nfs4_file *fp;
1229
1230 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1231 if (fp->fi_inode == ino) {
1232 get_nfs4_file(fp);
1da177e4 1233 return fp;
13cd2184 1234 }
1da177e4
LT		 1235 }
1236 return NULL;
1237}
1238
ba5a6a19
BF		 1239static int access_valid(u32 x)
1240{
1241 return (x > 0 && x < 4);
1242}
1243
1244static int deny_valid(u32 x)
1245{
1246 return (x >= 0 && x < 5);
1247}
1da177e4 1248
fd39ca9a 1249static void
1da177e4
LT		 1250set_access(unsigned int *access, unsigned long bmap) {
1251 int i;
1252
1253 *access = 0;
1254 for (i = 1; i < 4; i++) {
1255 if (test_bit(i, &bmap))
1256 *access |= i;
1257 }
1258}
1259
fd39ca9a 1260static void
1da177e4
LT		 1261set_deny(unsigned int *deny, unsigned long bmap) {
1262 int i;
1263
1264 *deny = 0;
1265 for (i = 0; i < 4; i++) {
1266 if (test_bit(i, &bmap))
1267 *deny |= i ;
1268 }
1269}
1270
1271static int
1272test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1273 unsigned int access, deny;
1274
1275 set_access(&access, stp->st_access_bmap);
1276 set_deny(&deny, stp->st_deny_bmap);
1277 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1278 return 0;
1279 return 1;
1280}
1281
1282/*
1283 * Called to check deny when READ with all zero stateid or
1284 * WRITE with all zero or all one stateid
1285 */
b37ad28b 1286static __be32
1da177e4
LT		 1287nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1288{
1289 struct inode *ino = current_fh->fh_dentry->d_inode;
1290 struct nfs4_file *fp;
1291 struct nfs4_stateid *stp;
b37ad28b 1292 __be32 ret;
1da177e4
LT		 1293
1294 dprintk("NFSD: nfs4_share_conflict\n");
1295
1296 fp = find_file(ino);
13cd2184
N		 1297 if (!fp)
1298 return nfs_ok;
b700949b 1299 ret = nfserr_locked;
1da177e4 1300 /* Search for conflicting share reservations */
13cd2184
N		 1301 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1302 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1303 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1304 goto out;
1da177e4 1305 }
13cd2184
N		 1306 ret = nfs_ok;
1307out:
1308 put_nfs4_file(fp);
1309 return ret;
1da177e4
LT		 1310}
1311
1312static inline void
1313nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1314{
1315 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1316 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1317 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1318 }
1319}
1320
1321/*
1322 * Recall a delegation
1323 */
1324static int
1325do_recall(void *__dp)
1326{
1327 struct nfs4_delegation *dp = __dp;
1328
1da177e4
LT		 1329 nfsd4_cb_recall(dp);
1330 return 0;
1331}
1332
1333/*
1334 * Spawn a thread to perform a recall on the delegation represented
1335 * by the lease (file_lock)
1336 *
1337 * Called from break_lease() with lock_kernel() held.
1338 * Note: we assume break_lease will only call this *once* for any given
1339 * lease.
1340 */
1341static
1342void nfsd_break_deleg_cb(struct file_lock *fl)
1343{
1344 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1345 struct task_struct *t;
1346
1347 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1348 if (!dp)
1349 return;
1350
1351 /* We're assuming the state code never drops its reference
1352 * without first removing the lease. Since we're in this lease
1353 * callback (and since the lease code is serialized by the kernel
1354 * lock) we know the server hasn't removed the lease yet, we know
1355 * it's safe to take a reference: */
1356 atomic_inc(&dp->dl_count);
1357
1358 spin_lock(&recall_lock);
1359 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1360 spin_unlock(&recall_lock);
1361
1362 /* only place dl_time is set. protected by lock_kernel*/
1363 dp->dl_time = get_seconds();
1364
1365 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1366 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1367
1368 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1369 if (IS_ERR(t)) {
1370 struct nfs4_client *clp = dp->dl_client;
1371
1372 printk(KERN_INFO "NFSD: Callback thread failed for "
1373 "for client (clientid %08x/%08x)\n",
1374 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1375 nfs4_put_delegation(dp);
1376 }
1377}
1378
1379/*
1380 * The file_lock is being reapd.
1381 *
1382 * Called by locks_free_lock() with lock_kernel() held.
1383 */
1384static
1385void nfsd_release_deleg_cb(struct file_lock *fl)
1386{
1387 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1388
1389 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1390
1391 if (!(fl->fl_flags & FL_LEASE) || !dp)
1392 return;
1393 dp->dl_flock = NULL;
1394}
1395
1396/*
1397 * Set the delegation file_lock back pointer.
1398 *
1399 * Called from __setlease() with lock_kernel() held.
1400 */
1401static
1402void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1403{
1404 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1405
1406 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1407 if (!dp)
1408 return;
1409 dp->dl_flock = new;
1410}
1411
1412/*
1413 * Called from __setlease() with lock_kernel() held
1414 */
1415static
1416int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1417{
1418 struct nfs4_delegation *onlistd =
1419 (struct nfs4_delegation *)onlist->fl_owner;
1420 struct nfs4_delegation *tryd =
1421 (struct nfs4_delegation *)try->fl_owner;
1422
1423 if (onlist->fl_lmops != try->fl_lmops)
1424 return 0;
1425
1426 return onlistd->dl_client == tryd->dl_client;
1427}
1428
1429
1430static
1431int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1432{
1433 if (arg & F_UNLCK)
1434 return lease_modify(onlist, arg);
1435 else
1436 return -EAGAIN;
1437}
1438
fd39ca9a 1439static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1440 .fl_break = nfsd_break_deleg_cb,
1441 .fl_release_private = nfsd_release_deleg_cb,
1442 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1443 .fl_mylease = nfsd_same_client_deleg_cb,
1444 .fl_change = nfsd_change_deleg_cb,
1445};
1446
1447
b37ad28b 1448__be32
1da177e4
LT		 1449nfsd4_process_open1(struct nfsd4_open *open)
1450{
1da177e4
LT		 1451 clientid_t *clientid = &open->op_clientid;
1452 struct nfs4_client *clp = NULL;
1453 unsigned int strhashval;
1454 struct nfs4_stateowner *sop = NULL;
1455
1da177e4 1456 if (!check_name(open->op_owner))
0f442aa2 1457 return nfserr_inval;
1da177e4
LT		 1458
1459 if (STALE_CLIENTID(&open->op_clientid))
1460 return nfserr_stale_clientid;
1461
1462 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1463 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1464 open->op_stateowner = sop;
1465 if (!sop) {
1466 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1467 clp = find_confirmed_client(clientid);
1468 if (clp == NULL)
0f442aa2
BF		 1469 return nfserr_expired;
1470 goto renew;
1da177e4 1471 }
0f442aa2
BF		 1472 if (!sop->so_confirmed) {
1473 /* Replace unconfirmed owners without checking for replay. */
1474 clp = sop->so_client;
1475 release_stateowner(sop);
1476 open->op_stateowner = NULL;
1477 goto renew;
1478 }
1479 if (open->op_seqid == sop->so_seqid - 1) {
1480 if (sop->so_replay.rp_buflen)
a90b061c 1481 return nfserr_replay_me;
0f442aa2
BF		 1482 /* The original OPEN failed so spectacularly
1483 * that we don't even have replay data saved!
1484 * Therefore, we have no choice but to continue
1485 * processing this OPEN; presumably, we'll
1486 * fail again for the same reason.
1487 */
1488 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1489 goto renew;
1490 }
1491 if (open->op_seqid != sop->so_seqid)
1492 return nfserr_bad_seqid;
1da177e4 1493renew:
0f442aa2
BF		 1494 if (open->op_stateowner == NULL) {
1495 sop = alloc_init_open_stateowner(strhashval, clp, open);
1496 if (sop == NULL)
1497 return nfserr_resource;
1498 open->op_stateowner = sop;
1499 }
1500 list_del_init(&sop->so_close_lru);
1da177e4 1501 renew_client(sop->so_client);
0f442aa2 1502 return nfs_ok;
1da177e4
LT		 1503}
1504
b37ad28b 1505static inline __be32
4a6e43e6
N		 1506nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1507{
1508 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1509 return nfserr_openmode;
1510 else
1511 return nfs_ok;
1512}
1513
52f4fb43
N		 1514static struct nfs4_delegation *
1515find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1516{
1517 struct nfs4_delegation *dp;
1518
ea1da636 1519 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1520 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1521 return dp;
1522 }
1523 return NULL;
1524}
1525
b37ad28b 1526static __be32
567d9829
N		 1527nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1528 struct nfs4_delegation **dp)
1529{
1530 int flags;
b37ad28b 1531 __be32 status = nfserr_bad_stateid;
567d9829
N		 1532
1533 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1534 if (*dp == NULL)
c44c5eeb 1535 goto out;
567d9829
N		 1536 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1537 RD_STATE : WR_STATE;
1538 status = nfs4_check_delegmode(*dp, flags);
1539 if (status)
1540 *dp = NULL;
c44c5eeb
N		 1541out:
1542 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1543 return nfs_ok;
1544 if (status)
1545 return status;
1546 open->op_stateowner->so_confirmed = 1;
1547 return nfs_ok;
567d9829
N		 1548}
1549
b37ad28b 1550static __be32
1da177e4
LT		 1551nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1552{
1553 struct nfs4_stateid *local;
b37ad28b 1554 __be32 status = nfserr_share_denied;
1da177e4
LT		 1555 struct nfs4_stateowner *sop = open->op_stateowner;
1556
8beefa24 1557 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1558 /* ignore lock owners */
1559 if (local->st_stateowner->so_is_open_owner == 0)
1560 continue;
1561 /* remember if we have seen this open owner */
1562 if (local->st_stateowner == sop)
1563 *stpp = local;
1564 /* check for conflicting share reservations */
1565 if (!test_share(local, open))
1566 goto out;
1567 }
1568 status = 0;
1569out:
1570 return status;
1571}
1572
5ac049ac
N		 1573static inline struct nfs4_stateid *
1574nfs4_alloc_stateid(void)
1575{
1576 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1577}
1578
b37ad28b 1579static __be32
1da177e4 1580nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1581 struct nfs4_delegation *dp,
1da177e4
LT		 1582 struct svc_fh *cur_fh, int flags)
1583{
1584 struct nfs4_stateid *stp;
1da177e4 1585
5ac049ac 1586 stp = nfs4_alloc_stateid();
1da177e4
LT		 1587 if (stp == NULL)
1588 return nfserr_resource;
1589
567d9829
N		 1590 if (dp) {
1591 get_file(dp->dl_vfs_file);
1592 stp->st_vfs_file = dp->dl_vfs_file;
1593 } else {
b37ad28b 1594 __be32 status;
567d9829
N		 1595 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1596 &stp->st_vfs_file);
1597 if (status) {
1598 if (status == nfserr_dropit)
1599 status = nfserr_jukebox;
5ac049ac 1600 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1601 return status;
1602 }
1da177e4 1603 }
1da177e4
LT		 1604 *stpp = stp;
1605 return 0;
1606}
1607
b37ad28b 1608static inline __be32
1da177e4
LT		 1609nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1610 struct nfsd4_open *open)
1611{
1612 struct iattr iattr = {
1613 .ia_valid = ATTR_SIZE,
1614 .ia_size = 0,
1615 };
1616 if (!open->op_truncate)
1617 return 0;
1618 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1619 return nfserr_inval;
1da177e4
LT		 1620 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1621}
1622
b37ad28b 1623static __be32
1da177e4
LT		 1624nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1625{
1626 struct file *filp = stp->st_vfs_file;
7eaa36e2 1627 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1628 unsigned int share_access, new_writer;
b37ad28b 1629 __be32 status;
1da177e4
LT		 1630
1631 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1632 new_writer = (~share_access) & open->op_share_access
1633 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1634
6c26d08f 1635 if (new_writer) {
b37ad28b
AV		 1636 int err = get_write_access(inode);
1637 if (err)
1638 return nfserrno(err);
6c26d08f 1639 }
1da177e4
LT		 1640 status = nfsd4_truncate(rqstp, cur_fh, open);
1641 if (status) {
6c26d08f
BF		 1642 if (new_writer)
1643 put_write_access(inode);
1da177e4
LT		 1644 return status;
1645 }
1646 /* remember the open */
6c26d08f 1647 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1648 set_bit(open->op_share_access, &stp->st_access_bmap);
1649 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1650
1651 return nfs_ok;
1652}
1653
1654
1da177e4 1655static void
37515177 1656nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1657{
37515177
N		 1658 open->op_stateowner->so_confirmed = 1;
1659 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1660}
1661
1662/*
1663 * Attempt to hand out a delegation.
1664 */
1665static void
1666nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1667{
1668 struct nfs4_delegation *dp;
1669 struct nfs4_stateowner *sop = stp->st_stateowner;
1670 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1671 struct file_lock fl, *flp = &fl;
1672 int status, flag = 0;
1673
1674 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1675 open->op_recall = 0;
1676 switch (open->op_claim_type) {
1677 case NFS4_OPEN_CLAIM_PREVIOUS:
1678 if (!atomic_read(&cb->cb_set))
1679 open->op_recall = 1;
1680 flag = open->op_delegate_type;
1681 if (flag == NFS4_OPEN_DELEGATE_NONE)
1682 goto out;
1683 break;
1684 case NFS4_OPEN_CLAIM_NULL:
1685 /* Let's not give out any delegations till everyone's
1686 * had the chance to reclaim theirs.... */
1687 if (nfs4_in_grace())
1688 goto out;
1689 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1690 goto out;
1691 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1692 flag = NFS4_OPEN_DELEGATE_WRITE;
1693 else
1694 flag = NFS4_OPEN_DELEGATE_READ;
1695 break;
1696 default:
1697 goto out;
1698 }
1da177e4
LT		 1699
1700 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1701 if (dp == NULL) {
1702 flag = NFS4_OPEN_DELEGATE_NONE;
1703 goto out;
1704 }
1705 locks_init_lock(&fl);
1706 fl.fl_lmops = &nfsd_lease_mng_ops;
1707 fl.fl_flags = FL_LEASE;
1708 fl.fl_end = OFFSET_MAX;
1709 fl.fl_owner = (fl_owner_t)dp;
1710 fl.fl_file = stp->st_vfs_file;
1711 fl.fl_pid = current->tgid;
1712
1713 /* setlease checks to see if delegation should be handed out.
1714 * the lock_manager callbacks fl_mylease and fl_change are used
1715 */
1716 if ((status = setlease(stp->st_vfs_file,
1717 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1718 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1719 unhash_delegation(dp);
1da177e4
LT		 1720 flag = NFS4_OPEN_DELEGATE_NONE;
1721 goto out;
1722 }
1723
1724 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1725
1726 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1727 dp->dl_stateid.si_boot,
1728 dp->dl_stateid.si_stateownerid,
1729 dp->dl_stateid.si_fileid,
1730 dp->dl_stateid.si_generation);
1731out:
7b190fec
N		 1732 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1733 && flag == NFS4_OPEN_DELEGATE_NONE
1734 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1735 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1736 open->op_delegate_type = flag;
1737}
1738
1739/*
1740 * called with nfs4_lock_state() held.
1741 */
b37ad28b 1742__be32
1da177e4
LT		 1743nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1744{
1745 struct nfs4_file *fp = NULL;
1746 struct inode *ino = current_fh->fh_dentry->d_inode;
1747 struct nfs4_stateid *stp = NULL;
567d9829 1748 struct nfs4_delegation *dp = NULL;
b37ad28b 1749 __be32 status;
1da177e4
LT		 1750
1751 status = nfserr_inval;
ba5a6a19
BF		 1752 if (!access_valid(open->op_share_access)
1753 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1754 goto out;
1755 /*
1756 * Lookup file; if found, lookup stateid and check open request,
1757 * and check for delegations in the process of being recalled.
1758 * If not found, create the nfs4_file struct
1759 */
1760 fp = find_file(ino);
1761 if (fp) {
1762 if ((status = nfs4_check_open(fp, open, &stp)))
1763 goto out;
c44c5eeb
N		 1764 status = nfs4_check_deleg(fp, open, &dp);
1765 if (status)
1766 goto out;
1da177e4 1767 } else {
c44c5eeb
N		 1768 status = nfserr_bad_stateid;
1769 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1770 goto out;
1da177e4
LT		 1771 status = nfserr_resource;
1772 fp = alloc_init_file(ino);
1773 if (fp == NULL)
1774 goto out;
1775 }
1776
1777 /*
1778 * OPEN the file, or upgrade an existing OPEN.
1779 * If truncate fails, the OPEN fails.
1780 */
1781 if (stp) {
1782 /* Stateid was found, this is an OPEN upgrade */
1783 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1784 if (status)
1785 goto out;
444c2c07 1786 update_stateid(&stp->st_stateid);
1da177e4
LT		 1787 } else {
1788 /* Stateid was not found, this is a new OPEN */
1789 int flags = 0;
9ecb6a08
BF		 1790 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1791 flags |= MAY_READ;
1da177e4 1792 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1793 flags |= MAY_WRITE;
567d9829
N		 1794 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1795 if (status)
1da177e4
LT		 1796 goto out;
1797 init_stateid(stp, fp, open);
1798 status = nfsd4_truncate(rqstp, current_fh, open);
1799 if (status) {
1800 release_stateid(stp, OPEN_STATE);
1801 goto out;
1802 }
1803 }
1804 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1805
1806 /*
1807 * Attempt to hand out a delegation. No error return, because the
1808 * OPEN succeeds even if we fail.
1809 */
1810 nfs4_open_delegation(current_fh, open, stp);
1811
1812 status = nfs_ok;
1813
1814 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1815 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1816 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1817out:
13cd2184
N		 1818 if (fp)
1819 put_nfs4_file(fp);
37515177
N		 1820 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1821 nfs4_set_claim_prev(open);
1da177e4
LT		 1822 /*
1823 * To finish the open response, we just need to set the rflags.
1824 */
1825 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1826 if (!open->op_stateowner->so_confirmed)
1827 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1828
1829 return status;
1830}
1831
58da282b 1832static struct workqueue_struct *laundry_wq;
c4028958
DH		 1833static void laundromat_main(struct work_struct *);
1834static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1835
b37ad28b 1836__be32
b591480b
BF		 1837nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1838 clientid_t *clid)
1da177e4
LT		 1839{
1840 struct nfs4_client *clp;
b37ad28b 1841 __be32 status;
1da177e4
LT		 1842
1843 nfs4_lock_state();
1844 dprintk("process_renew(%08x/%08x): starting\n",
1845 clid->cl_boot, clid->cl_id);
1846 status = nfserr_stale_clientid;
1847 if (STALE_CLIENTID(clid))
1848 goto out;
1849 clp = find_confirmed_client(clid);
1850 status = nfserr_expired;
1851 if (clp == NULL) {
1852 /* We assume the client took too long to RENEW. */
1853 dprintk("nfsd4_renew: clientid not found!\n");
1854 goto out;
1855 }
1856 renew_client(clp);
1857 status = nfserr_cb_path_down;
ea1da636 1858 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1859 && !atomic_read(&clp->cl_callback.cb_set))
1860 goto out;
1861 status = nfs_ok;
1862out:
1863 nfs4_unlock_state();
1864 return status;
1865}
1866
a76b4319
N		 1867static void
1868end_grace(void)
1869{
1870 dprintk("NFSD: end of grace period\n");
c7b9a459 1871 nfsd4_recdir_purge_old();
a76b4319
N		 1872 in_grace = 0;
1873}
1874
fd39ca9a 1875static time_t
1da177e4
LT		 1876nfs4_laundromat(void)
1877{
1878 struct nfs4_client *clp;
1879 struct nfs4_stateowner *sop;
1880 struct nfs4_delegation *dp;
1881 struct list_head *pos, *next, reaplist;
1882 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1883 time_t t, clientid_val = NFSD_LEASE_TIME;
1884 time_t u, test_val = NFSD_LEASE_TIME;
1885
1886 nfs4_lock_state();
1887
1888 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1889 if (in_grace)
1890 end_grace();
1da177e4
LT		 1891 list_for_each_safe(pos, next, &client_lru) {
1892 clp = list_entry(pos, struct nfs4_client, cl_lru);
1893 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1894 t = clp->cl_time - cutoff;
1895 if (clientid_val > t)
1896 clientid_val = t;
1897 break;
1898 }
1899 dprintk("NFSD: purging unused client (clientid %08x)\n",
1900 clp->cl_clientid.cl_id);
c7b9a459 1901 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1902 expire_client(clp);
1903 }
1904 INIT_LIST_HEAD(&reaplist);
1905 spin_lock(&recall_lock);
1906 list_for_each_safe(pos, next, &del_recall_lru) {
1907 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1908 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1909 u = dp->dl_time - cutoff;
1910 if (test_val > u)
1911 test_val = u;
1912 break;
1913 }
1914 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1915 dp, dp->dl_flock);
1916 list_move(&dp->dl_recall_lru, &reaplist);
1917 }
1918 spin_unlock(&recall_lock);
1919 list_for_each_safe(pos, next, &reaplist) {
1920 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1921 list_del_init(&dp->dl_recall_lru);
1922 unhash_delegation(dp);
1923 }
1924 test_val = NFSD_LEASE_TIME;
1925 list_for_each_safe(pos, next, &close_lru) {
1926 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1927 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1928 u = sop->so_time - cutoff;
1929 if (test_val > u)
1930 test_val = u;
1931 break;
1932 }
1933 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1934 sop->so_id);
358dd55a 1935 release_stateowner(sop);
1da177e4
LT		 1936 }
1937 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1938 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1939 nfs4_unlock_state();
1940 return clientid_val;
1941}
1942
1943void
c4028958 1944laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1945{
1946 time_t t;
1947
1948 t = nfs4_laundromat();
1949 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1950 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1951}
1952
fd39ca9a 1953static struct nfs4_stateowner *
f8816512
N		 1954search_close_lru(u32 st_id, int flags)
1955{
1da177e4
LT		 1956 struct nfs4_stateowner *local = NULL;
1957
1da177e4
LT		 1958 if (flags & CLOSE_STATE) {
1959 list_for_each_entry(local, &close_lru, so_close_lru) {
1960 if (local->so_id == st_id)
1961 return local;
1962 }
1963 }
1964 return NULL;
1965}
1966
1967static inline int
1968nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1969{
7eaa36e2 1970 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1971}
1972
1973static int
1974STALE_STATEID(stateid_t *stateid)
1975{
1976 if (stateid->si_boot == boot_time)
1977 return 0;
849823c5 1978 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1979 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1980 stateid->si_generation);
1981 return 1;
1982}
1983
1984static inline int
1985access_permit_read(unsigned long access_bmap)
1986{
1987 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1988 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1989 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1990}
1991
1992static inline int
1993access_permit_write(unsigned long access_bmap)
1994{
1995 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1996 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1997}
1998
1999static
b37ad28b 2000__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 2001{
b37ad28b 2002 __be32 status = nfserr_openmode;
1da177e4
LT		 2003
2004 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2005 goto out;
2006 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2007 goto out;
2008 status = nfs_ok;
2009out:
2010 return status;
2011}
2012
b37ad28b 2013static inline __be32
1da177e4
LT		 2014check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2015{
2016 /* Trying to call delegreturn with a special stateid? Yuch: */
2017 if (!(flags & (RD_STATE | WR_STATE)))
2018 return nfserr_bad_stateid;
2019 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2020 return nfs_ok;
2021 else if (nfs4_in_grace()) {
2022 /* Answer in remaining cases depends on existance of
2023 * conflicting state; so we must wait out the grace period. */
2024 return nfserr_grace;
2025 } else if (flags & WR_STATE)
2026 return nfs4_share_conflict(current_fh,
2027 NFS4_SHARE_DENY_WRITE);
2028 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2029 return nfs4_share_conflict(current_fh,
2030 NFS4_SHARE_DENY_READ);
2031}
2032
2033/*
2034 * Allow READ/WRITE during grace period on recovered state only for files
2035 * that are not able to provide mandatory locking.
2036 */
2037static inline int
2038io_during_grace_disallowed(struct inode *inode, int flags)
2039{
2040 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2041 && MANDATORY_LOCK(inode);
2042}
2043
2044/*
2045* Checks for stateid operations
2046*/
b37ad28b 2047__be32
1da177e4
LT		 2048nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2049{
2050 struct nfs4_stateid *stp = NULL;
2051 struct nfs4_delegation *dp = NULL;
2052 stateid_t *stidp;
2053 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 2054 __be32 status;
1da177e4
LT		 2055
2056 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2057 stateid->si_boot, stateid->si_stateownerid,
2058 stateid->si_fileid, stateid->si_generation);
2059 if (filpp)
2060 *filpp = NULL;
2061
2062 if (io_during_grace_disallowed(ino, flags))
2063 return nfserr_grace;
2064
2065 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2066 return check_special_stateids(current_fh, stateid, flags);
2067
2068 /* STALE STATEID */
2069 status = nfserr_stale_stateid;
2070 if (STALE_STATEID(stateid))
2071 goto out;
2072
2073 /* BAD STATEID */
2074 status = nfserr_bad_stateid;
2075 if (!stateid->si_fileid) { /* delegation stateid */
2076 if(!(dp = find_delegation_stateid(ino, stateid))) {
2077 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2078 goto out;
2079 }
2080 stidp = &dp->dl_stateid;
2081 } else { /* open or lock stateid */
2082 if (!(stp = find_stateid(stateid, flags))) {
2083 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2084 goto out;
2085 }
2086 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2087 goto out;
2088 if (!stp->st_stateowner->so_confirmed)
2089 goto out;
2090 stidp = &stp->st_stateid;
2091 }
2092 if (stateid->si_generation > stidp->si_generation)
2093 goto out;
2094
2095 /* OLD STATEID */
2096 status = nfserr_old_stateid;
2097 if (stateid->si_generation < stidp->si_generation)
2098 goto out;
2099 if (stp) {
2100 if ((status = nfs4_check_openmode(stp,flags)))
2101 goto out;
2102 renew_client(stp->st_stateowner->so_client);
2103 if (filpp)
2104 *filpp = stp->st_vfs_file;
2105 } else if (dp) {
2106 if ((status = nfs4_check_delegmode(dp, flags)))
2107 goto out;
2108 renew_client(dp->dl_client);
2109 if (flags & DELEG_RET)
2110 unhash_delegation(dp);
2111 if (filpp)
2112 *filpp = dp->dl_vfs_file;
2113 }
2114 status = nfs_ok;
2115out:
2116 return status;
2117}
2118
4c4cd222
N		 2119static inline int
2120setlkflg (int type)
2121{
2122 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2123 RD_STATE : WR_STATE;
2124}
1da177e4
LT		 2125
2126/*
2127 * Checks for sequence id mutating operations.
2128 */
b37ad28b 2129static __be32
4c4cd222 2130nfs4_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 2131{
1da177e4
LT		 2132 struct nfs4_stateid *stp;
2133 struct nfs4_stateowner *sop;
2134
2135 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2136 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2137 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2138 stateid->si_generation);
3a4f98bb 2139
1da177e4
LT		 2140 *stpp = NULL;
2141 *sopp = NULL;
2142
1da177e4
LT		 2143 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2144 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2145 return nfserr_bad_stateid;
1da177e4
LT		 2146 }
2147
1da177e4 2148 if (STALE_STATEID(stateid))
3a4f98bb 2149 return nfserr_stale_stateid;
1da177e4
LT		 2150 /*
2151 * We return BAD_STATEID if filehandle doesn't match stateid,
2152 * the confirmed flag is incorrecly set, or the generation
2153 * number is incorrect.
1da177e4 2154 */
f8816512
N		 2155 stp = find_stateid(stateid, flags);
2156 if (stp == NULL) {
2157 /*
2158 * Also, we should make sure this isn't just the result of
2159 * a replayed close:
2160 */
2161 sop = search_close_lru(stateid->si_stateownerid, flags);
2162 if (sop == NULL)
2163 return nfserr_bad_stateid;
2164 *sopp = sop;
2165 goto check_replay;
2166 }
1da177e4 2167
4c4cd222 2168 if (lock) {
1da177e4 2169 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2170 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2171 struct nfs4_client *clp = sop->so_client;
4c4cd222 2172 int lkflg = 0;
b37ad28b 2173 __be32 status;
4c4cd222
N		 2174
2175 lkflg = setlkflg(lock->lk_type);
2176
2177 if (lock->lk_is_new) {
2178 if (!sop->so_is_open_owner)
2179 return nfserr_bad_stateid;
2180 if (!cmp_clid(&clp->cl_clientid, lockclid))
2181 return nfserr_bad_stateid;
2182 /* stp is the open stateid */
2183 status = nfs4_check_openmode(stp, lkflg);
2184 if (status)
2185 return status;
2186 } else {
2187 /* stp is the lock stateid */
2188 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2189 if (status)
2190 return status;
2191 }
1da177e4 2192
1da177e4
LT		 2193 }
2194
2195 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2196 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2197 return nfserr_bad_stateid;
1da177e4
LT		 2198 }
2199
2200 *stpp = stp;
2201 *sopp = sop = stp->st_stateowner;
2202
2203 /*
2204 * We now validate the seqid and stateid generation numbers.
2205 * For the moment, we ignore the possibility of
2206 * generation number wraparound.
2207 */
bd9aac52 2208 if (seqid != sop->so_seqid)
1da177e4
LT		 2209 goto check_replay;
2210
3a4f98bb
N		 2211 if (sop->so_confirmed && flags & CONFIRM) {
2212 printk("NFSD: preprocess_seqid_op: expected"
2213 " unconfirmed stateowner!\n");
2214 return nfserr_bad_stateid;
1da177e4 2215 }
3a4f98bb
N		 2216 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2217 printk("NFSD: preprocess_seqid_op: stateowner not"
2218 " confirmed yet!\n");
2219 return nfserr_bad_stateid;
1da177e4
LT		 2220 }
2221 if (stateid->si_generation > stp->st_stateid.si_generation) {
2222 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2223 return nfserr_bad_stateid;
1da177e4
LT		 2224 }
2225
1da177e4
LT		 2226 if (stateid->si_generation < stp->st_stateid.si_generation) {
2227 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2228 return nfserr_old_stateid;
1da177e4 2229 }
52fd004e 2230 renew_client(sop->so_client);
3a4f98bb 2231 return nfs_ok;
1da177e4 2232
1da177e4 2233check_replay:
bd9aac52 2234 if (seqid == sop->so_seqid - 1) {
849823c5 2235 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2236 /* indicate replay to calling function */
a90b061c 2237 return nfserr_replay_me;
1da177e4 2238 }
3a4f98bb
N		 2239 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2240 sop->so_seqid, seqid);
2241 *sopp = NULL;
2242 return nfserr_bad_seqid;
1da177e4
LT		 2243}
2244
b37ad28b 2245__be32
ca364317 2246nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2247 struct nfsd4_open_confirm *oc)
1da177e4 2248{
b37ad28b 2249 __be32 status;
1da177e4
LT		 2250 struct nfs4_stateowner *sop;
2251 struct nfs4_stateid *stp;
2252
2253 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2254 (int)cstate->current_fh.fh_dentry->d_name.len,
2255 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2256
ca364317 2257 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2258 if (status)
2259 return status;
1da177e4
LT		 2260
2261 nfs4_lock_state();
2262
ca364317
BF		 2263 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2264 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2265 CHECK_FH | CONFIRM | OPEN_STATE,
2266 &oc->oc_stateowner, &stp, NULL)))
2267 goto out;
2268
2269 sop = oc->oc_stateowner;
2270 sop->so_confirmed = 1;
2271 update_stateid(&stp->st_stateid);
2272 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2273 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2274 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2275 stp->st_stateid.si_boot,
2276 stp->st_stateid.si_stateownerid,
2277 stp->st_stateid.si_fileid,
2278 stp->st_stateid.si_generation);
c7b9a459
N		 2279
2280 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2281out:
f2327d9a 2282 if (oc->oc_stateowner) {
1da177e4 2283 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2284 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2285 }
1da177e4
LT		 2286 nfs4_unlock_state();
2287 return status;
2288}
2289
2290
2291/*
2292 * unset all bits in union bitmap (bmap) that
2293 * do not exist in share (from successful OPEN_DOWNGRADE)
2294 */
2295static void
2296reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2297{
2298 int i;
2299 for (i = 1; i < 4; i++) {
2300 if ((i & access) != i)
2301 __clear_bit(i, bmap);
2302 }
2303}
2304
2305static void
2306reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2307{
2308 int i;
2309 for (i = 0; i < 4; i++) {
2310 if ((i & deny) != i)
2311 __clear_bit(i, bmap);
2312 }
2313}
2314
b37ad28b 2315__be32
ca364317
BF		 2316nfsd4_open_downgrade(struct svc_rqst *rqstp,
2317 struct nfsd4_compound_state *cstate,
a4f1706a 2318 struct nfsd4_open_downgrade *od)
1da177e4 2319{
b37ad28b 2320 __be32 status;
1da177e4
LT		 2321 struct nfs4_stateid *stp;
2322 unsigned int share_access;
2323
2324 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2325 (int)cstate->current_fh.fh_dentry->d_name.len,
2326 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2327
ba5a6a19
BF		 2328 if (!access_valid(od->od_share_access)
2329 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2330 return nfserr_inval;
2331
2332 nfs4_lock_state();
ca364317
BF		 2333 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2334 od->od_seqid,
1da177e4
LT		 2335 &od->od_stateid,
2336 CHECK_FH | OPEN_STATE,
2337 &od->od_stateowner, &stp, NULL)))
2338 goto out;
2339
2340 status = nfserr_inval;
2341 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2342 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2343 stp->st_access_bmap, od->od_share_access);
2344 goto out;
2345 }
2346 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2347 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2348 stp->st_deny_bmap, od->od_share_deny);
2349 goto out;
2350 }
2351 set_access(&share_access, stp->st_access_bmap);
2352 nfs4_file_downgrade(stp->st_vfs_file,
2353 share_access & ~od->od_share_access);
2354
2355 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2356 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2357
2358 update_stateid(&stp->st_stateid);
2359 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2360 status = nfs_ok;
2361out:
f2327d9a 2362 if (od->od_stateowner) {
1da177e4 2363 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2364 cstate->replay_owner = od->od_stateowner;
f2327d9a 2365 }
1da177e4
LT		 2366 nfs4_unlock_state();
2367 return status;
2368}
2369
2370/*
2371 * nfs4_unlock_state() called after encode
2372 */
b37ad28b 2373__be32
ca364317 2374nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2375 struct nfsd4_close *close)
1da177e4 2376{
b37ad28b 2377 __be32 status;
1da177e4
LT		 2378 struct nfs4_stateid *stp;
2379
2380 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2381 (int)cstate->current_fh.fh_dentry->d_name.len,
2382 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2383
2384 nfs4_lock_state();
2385 /* check close_lru for replay */
ca364317
BF		 2386 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2387 close->cl_seqid,
1da177e4
LT		 2388 &close->cl_stateid,
2389 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2390 &close->cl_stateowner, &stp, NULL)))
2391 goto out;
1da177e4
LT		 2392 status = nfs_ok;
2393 update_stateid(&stp->st_stateid);
2394 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2395
04ef5954
BF		 2396 /* release_stateid() calls nfsd_close() if needed */
2397 release_stateid(stp, OPEN_STATE);
2398
2399 /* place unused nfs4_stateowners on so_close_lru list to be
2400 * released by the laundromat service after the lease period
2401 * to enable us to handle CLOSE replay
2402 */
2403 if (list_empty(&close->cl_stateowner->so_stateids))
2404 move_to_close_lru(close->cl_stateowner);
1da177e4 2405out:
f2327d9a 2406 if (close->cl_stateowner) {
1da177e4 2407 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2408 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2409 }
1da177e4
LT		 2410 nfs4_unlock_state();
2411 return status;
2412}
2413
b37ad28b 2414__be32
ca364317
BF		 2415nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2416 struct nfsd4_delegreturn *dr)
1da177e4 2417{
b37ad28b 2418 __be32 status;
1da177e4 2419
ca364317 2420 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2421 goto out;
2422
2423 nfs4_lock_state();
ca364317
BF		 2424 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2425 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2426 nfs4_unlock_state();
2427out:
2428 return status;
2429}
2430
2431
2432/*
2433 * Lock owner state (byte-range locks)
2434 */
2435#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2436#define LOCK_HASH_BITS 8
2437#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2438#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2439
2440#define lockownerid_hashval(id) \
2441 ((id) & LOCK_HASH_MASK)
2442
2443static inline unsigned int
2444lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2445 struct xdr_netobj *ownername)
2446{
2447 return (file_hashval(inode) + cl_id
2448 + opaque_hashval(ownername->data, ownername->len))
2449 & LOCK_HASH_MASK;
2450}
2451
2452static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2453static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2454static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2455
fd39ca9a 2456static struct nfs4_stateid *
1da177e4
LT		 2457find_stateid(stateid_t *stid, int flags)
2458{
2459 struct nfs4_stateid *local = NULL;
2460 u32 st_id = stid->si_stateownerid;
2461 u32 f_id = stid->si_fileid;
2462 unsigned int hashval;
2463
2464 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2465 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2466 hashval = stateid_hashval(st_id, f_id);
2467 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2468 if ((local->st_stateid.si_stateownerid == st_id) &&
2469 (local->st_stateid.si_fileid == f_id))
2470 return local;
2471 }
2472 }
2473 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2474 hashval = stateid_hashval(st_id, f_id);
2475 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2476 if ((local->st_stateid.si_stateownerid == st_id) &&
2477 (local->st_stateid.si_fileid == f_id))
2478 return local;
2479 }
849823c5 2480 }
1da177e4
LT		 2481 return NULL;
2482}
2483
2484static struct nfs4_delegation *
2485find_delegation_stateid(struct inode *ino, stateid_t *stid)
2486{
13cd2184
N		 2487 struct nfs4_file *fp;
2488 struct nfs4_delegation *dl;
1da177e4
LT		 2489
2490 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2491 stid->si_boot, stid->si_stateownerid,
2492 stid->si_fileid, stid->si_generation);
2493
1da177e4 2494 fp = find_file(ino);
13cd2184
N		 2495 if (!fp)
2496 return NULL;
2497 dl = find_delegation_file(fp, stid);
2498 put_nfs4_file(fp);
2499 return dl;
1da177e4
LT		 2500}
2501
2502/*
2503 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2504 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2505 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2506 * locking, this prevents us from being completely protocol-compliant. The
2507 * real solution to this problem is to start using unsigned file offsets in
2508 * the VFS, but this is a very deep change!
2509 */
2510static inline void
2511nfs4_transform_lock_offset(struct file_lock *lock)
2512{
2513 if (lock->fl_start < 0)
2514 lock->fl_start = OFFSET_MAX;
2515 if (lock->fl_end < 0)
2516 lock->fl_end = OFFSET_MAX;
2517}
2518
d5b9026a
N		 2519/* Hack!: For now, we're defining this just so we can use a pointer to it
2520 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2521static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2522};
1da177e4
LT		 2523
2524static inline void
2525nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2526{
d5b9026a
N		 2527 struct nfs4_stateowner *sop;
2528 unsigned int hval;
1da177e4 2529
d5b9026a
N		 2530 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2531 sop = (struct nfs4_stateowner *) fl->fl_owner;
2532 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2533 kref_get(&sop->so_ref);
2534 deny->ld_sop = sop;
2535 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2536 } else {
2537 deny->ld_sop = NULL;
2538 deny->ld_clientid.cl_boot = 0;
2539 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2540 }
2541 deny->ld_start = fl->fl_start;
2542 deny->ld_length = ~(u64)0;
2543 if (fl->fl_end != ~(u64)0)
2544 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2545 deny->ld_type = NFS4_READ_LT;
2546 if (fl->fl_type != F_RDLCK)
2547 deny->ld_type = NFS4_WRITE_LT;
2548}
2549
1da177e4
LT		 2550static struct nfs4_stateowner *
2551find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2552 struct xdr_netobj *owner)
2553{
2554 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2555 struct nfs4_stateowner *op;
2556
2557 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2558 if (cmp_owner_str(op, owner, clid))
2559 return op;
2560 }
2561 return NULL;
2562}
2563
2564/*
2565 * Alloc a lock owner structure.
2566 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2567 * occured.
2568 *
2569 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2570 */
2571
2572static struct nfs4_stateowner *
2573alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2574 struct nfs4_stateowner *sop;
2575 struct nfs4_replay *rp;
2576 unsigned int idhashval;
2577
2578 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2579 return NULL;
2580 idhashval = lockownerid_hashval(current_ownerid);
2581 INIT_LIST_HEAD(&sop->so_idhash);
2582 INIT_LIST_HEAD(&sop->so_strhash);
2583 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2584 INIT_LIST_HEAD(&sop->so_stateids);
2585 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2586 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2587 sop->so_time = 0;
2588 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2589 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2590 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2591 sop->so_is_open_owner = 0;
2592 sop->so_id = current_ownerid++;
2593 sop->so_client = clp;
b59e3c0e
NB		 2594 /* It is the openowner seqid that will be incremented in encode in the
2595 * case of new lockowners; so increment the lock seqid manually: */
2596 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2597 sop->so_confirmed = 1;
2598 rp = &sop->so_replay;
de1ae286 2599 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2600 rp->rp_buflen = 0;
2601 rp->rp_buf = rp->rp_ibuf;
2602 return sop;
2603}
2604
fd39ca9a 2605static struct nfs4_stateid *
1da177e4
LT		 2606alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2607{
2608 struct nfs4_stateid *stp;
2609 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2610
5ac049ac
N		 2611 stp = nfs4_alloc_stateid();
2612 if (stp == NULL)
1da177e4
LT		 2613 goto out;
2614 INIT_LIST_HEAD(&stp->st_hash);
2615 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2616 INIT_LIST_HEAD(&stp->st_perstateowner);
2617 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2618 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2619 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2620 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2621 stp->st_stateowner = sop;
13cd2184 2622 get_nfs4_file(fp);
1da177e4
LT		 2623 stp->st_file = fp;
2624 stp->st_stateid.si_boot = boot_time;
2625 stp->st_stateid.si_stateownerid = sop->so_id;
2626 stp->st_stateid.si_fileid = fp->fi_id;
2627 stp->st_stateid.si_generation = 0;
2628 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2629 stp->st_access_bmap = open_stp->st_access_bmap;
2630 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2631 stp->st_openstp = open_stp;
1da177e4
LT		 2632
2633out:
2634 return stp;
2635}
2636
fd39ca9a 2637static int
1da177e4
LT		 2638check_lock_length(u64 offset, u64 length)
2639{
2640 return ((length == 0) || ((length != ~(u64)0) &&
2641 LOFF_OVERFLOW(offset, length)));
2642}
2643
2644/*
2645 * LOCK operation
2646 */
b37ad28b 2647__be32
ca364317 2648nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2649 struct nfsd4_lock *lock)
1da177e4 2650{
3e9e3dbe 2651 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2652 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2653 struct nfs4_stateid *lock_stp;
2654 struct file *filp;
2655 struct file_lock file_lock;
8dc7c311 2656 struct file_lock conflock;
b37ad28b 2657 __be32 status = 0;
1da177e4 2658 unsigned int strhashval;
150b3934 2659 unsigned int cmd;
b8dd7b9a 2660 int err;
1da177e4
LT		 2661
2662 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2663 (long long) lock->lk_offset,
2664 (long long) lock->lk_length);
2665
1da177e4
LT		 2666 if (check_lock_length(lock->lk_offset, lock->lk_length))
2667 return nfserr_inval;
2668
ca364317
BF		 2669 if ((status = fh_verify(rqstp, &cstate->current_fh,
2670 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2671 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2672 return status;
2673 }
2674
1da177e4
LT		 2675 nfs4_lock_state();
2676
2677 if (lock->lk_is_new) {
893f8770
N		 2678 /*
2679 * Client indicates that this is a new lockowner.
2680 * Use open owner and open stateid to create lock owner and
2681 * lock stateid.
2682 */
1da177e4
LT		 2683 struct nfs4_stateid *open_stp = NULL;
2684 struct nfs4_file *fp;
2685
2686 status = nfserr_stale_clientid;
849823c5 2687 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2688 goto out;
1da177e4 2689
1da177e4 2690 /* validate and update open stateid and open seqid */
ca364317 2691 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2692 lock->lk_new_open_seqid,
2693 &lock->lk_new_open_stateid,
2694 CHECK_FH | OPEN_STATE,
3a65588a 2695 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2696 lock);
37515177 2697 if (status)
1da177e4 2698 goto out;
3a65588a 2699 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2700 /* create lockowner and lock stateid */
2701 fp = open_stp->st_file;
2702 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2703 open_sop->so_client->cl_clientid.cl_id,
2704 &lock->v.new.owner);
3e9e3dbe
N		 2705 /* XXX: Do we need to check for duplicate stateowners on
2706 * the same file, or should they just be allowed (and
2707 * create new stateids)? */
1da177e4 2708 status = nfserr_resource;
b59e3c0e
NB		 2709 lock_sop = alloc_init_lock_stateowner(strhashval,
2710 open_sop->so_client, open_stp, lock);
2711 if (lock_sop == NULL)
1da177e4 2712 goto out;
b59e3c0e 2713 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2714 if (lock_stp == NULL)
1da177e4 2715 goto out;
1da177e4
LT		 2716 } else {
2717 /* lock (lock owner + lock stateid) already exists */
ca364317 2718 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2719 lock->lk_old_lock_seqid,
2720 &lock->lk_old_lock_stateid,
2721 CHECK_FH | LOCK_STATE,
3a65588a 2722 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2723 if (status)
2724 goto out;
3a65588a 2725 lock_sop = lock->lk_replay_owner;
1da177e4 2726 }
3a65588a 2727 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2728 filp = lock_stp->st_vfs_file;
2729
0dd395dc
N		 2730 status = nfserr_grace;
2731 if (nfs4_in_grace() && !lock->lk_reclaim)
2732 goto out;
2733 status = nfserr_no_grace;
2734 if (!nfs4_in_grace() && lock->lk_reclaim)
2735 goto out;
2736
1da177e4
LT		 2737 locks_init_lock(&file_lock);
2738 switch (lock->lk_type) {
2739 case NFS4_READ_LT:
2740 case NFS4_READW_LT:
2741 file_lock.fl_type = F_RDLCK;
150b3934 2742 cmd = F_SETLK;
1da177e4
LT		 2743 break;
2744 case NFS4_WRITE_LT:
2745 case NFS4_WRITEW_LT:
2746 file_lock.fl_type = F_WRLCK;
150b3934 2747 cmd = F_SETLK;
1da177e4
LT		 2748 break;
2749 default:
2750 status = nfserr_inval;
2751 goto out;
2752 }
b59e3c0e 2753 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2754 file_lock.fl_pid = current->tgid;
2755 file_lock.fl_file = filp;
2756 file_lock.fl_flags = FL_POSIX;
d5b9026a 2757 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2758
2759 file_lock.fl_start = lock->lk_offset;
2760 if ((lock->lk_length == ~(u64)0) ||
2761 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2762 file_lock.fl_end = ~(u64)0;
2763 else
2764 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2765 nfs4_transform_lock_offset(&file_lock);
2766
2767 /*
2768 * Try to lock the file in the VFS.
2769 * Note: locks.c uses the BKL to protect the inode's lock list.
2770 */
2771
eb76b3fd
AA		 2772 /* XXX?: Just to divert the locks_release_private at the start of
2773 * locks_copy_lock: */
150b3934 2774 locks_init_lock(&conflock);
fd85b817 2775 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2776 switch (-err) {
1da177e4
LT		 2777 case 0: /* success! */
2778 update_stateid(&lock_stp->st_stateid);
2779 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2780 sizeof(stateid_t));
b8dd7b9a 2781 status = 0;
eb76b3fd
AA		 2782 break;
2783 case (EAGAIN): /* conflock holds conflicting lock */
2784 status = nfserr_denied;
2785 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2786 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2787 break;
1da177e4
LT		 2788 case (EDEADLK):
2789 status = nfserr_deadlock;
eb76b3fd 2790 break;
1da177e4 2791 default:
fd85b817 2792 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2793 status = nfserr_resource;
2794 break;
1da177e4 2795 }
1da177e4 2796out:
8a280510
BF		 2797 if (status && lock->lk_is_new && lock_sop)
2798 release_stateowner(lock_sop);
3a65588a
BF		 2799 if (lock->lk_replay_owner) {
2800 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2801 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2802 }
1da177e4
LT		 2803 nfs4_unlock_state();
2804 return status;
2805}
2806
2807/*
2808 * LOCKT operation
2809 */
b37ad28b 2810__be32
ca364317
BF		 2811nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2812 struct nfsd4_lockt *lockt)
1da177e4
LT		 2813{
2814 struct inode *inode;
2815 struct file file;
2816 struct file_lock file_lock;
fd85b817 2817 int error;
b37ad28b 2818 __be32 status;
1da177e4
LT		 2819
2820 if (nfs4_in_grace())
2821 return nfserr_grace;
2822
2823 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2824 return nfserr_inval;
2825
2826 lockt->lt_stateowner = NULL;
2827 nfs4_lock_state();
2828
2829 status = nfserr_stale_clientid;
849823c5 2830 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2831 goto out;
1da177e4 2832
ca364317 2833 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2834 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2835 if (status == nfserr_symlink)
2836 status = nfserr_inval;
2837 goto out;
2838 }
2839
ca364317 2840 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2841 locks_init_lock(&file_lock);
2842 switch (lockt->lt_type) {
2843 case NFS4_READ_LT:
2844 case NFS4_READW_LT:
2845 file_lock.fl_type = F_RDLCK;
2846 break;
2847 case NFS4_WRITE_LT:
2848 case NFS4_WRITEW_LT:
2849 file_lock.fl_type = F_WRLCK;
2850 break;
2851 default:
2852 printk("NFSD: nfs4_lockt: bad lock type!\n");
2853 status = nfserr_inval;
2854 goto out;
2855 }
2856
2857 lockt->lt_stateowner = find_lockstateowner_str(inode,
2858 &lockt->lt_clientid, &lockt->lt_owner);
2859 if (lockt->lt_stateowner)
2860 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2861 file_lock.fl_pid = current->tgid;
2862 file_lock.fl_flags = FL_POSIX;
d5b9026a 2863 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2864
2865 file_lock.fl_start = lockt->lt_offset;
2866 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2867 file_lock.fl_end = ~(u64)0;
2868 else
2869 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2870
2871 nfs4_transform_lock_offset(&file_lock);
2872
fd85b817 2873 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2874 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2875 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2876 * only the dentry:inode set.
2877 */
2878 memset(&file, 0, sizeof (struct file));
ca364317 2879 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2880
2881 status = nfs_ok;
fd85b817
ME		 2882 error = vfs_test_lock(&file, &file_lock);
2883 if (error) {
2884 status = nfserrno(error);
2885 goto out;
2886 }
9d6a8c5c 2887 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2888 status = nfserr_denied;
9d6a8c5c 2889 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2890 }
2891out:
2892 nfs4_unlock_state();
2893 return status;
2894}
2895
b37ad28b 2896__be32
ca364317 2897nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2898 struct nfsd4_locku *locku)
1da177e4
LT		 2899{
2900 struct nfs4_stateid *stp;
2901 struct file *filp = NULL;
2902 struct file_lock file_lock;
b37ad28b 2903 __be32 status;
b8dd7b9a 2904 int err;
1da177e4
LT		 2905
2906 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2907 (long long) locku->lu_offset,
2908 (long long) locku->lu_length);
2909
2910 if (check_lock_length(locku->lu_offset, locku->lu_length))
2911 return nfserr_inval;
2912
2913 nfs4_lock_state();
2914
ca364317 2915 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2916 locku->lu_seqid,
2917 &locku->lu_stateid,
2918 CHECK_FH | LOCK_STATE,
2919 &locku->lu_stateowner, &stp, NULL)))
2920 goto out;
2921
2922 filp = stp->st_vfs_file;
2923 BUG_ON(!filp);
2924 locks_init_lock(&file_lock);
2925 file_lock.fl_type = F_UNLCK;
2926 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2927 file_lock.fl_pid = current->tgid;
2928 file_lock.fl_file = filp;
2929 file_lock.fl_flags = FL_POSIX;
d5b9026a 2930 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2931 file_lock.fl_start = locku->lu_offset;
2932
2933 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2934 file_lock.fl_end = ~(u64)0;
2935 else
2936 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2937 nfs4_transform_lock_offset(&file_lock);
2938
2939 /*
2940 * Try to unlock the file in the VFS.
2941 */
fd85b817 2942 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2943 if (err) {
fd85b817 2944 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2945 goto out_nfserr;
2946 }
2947 /*
2948 * OK, unlock succeeded; the only thing left to do is update the stateid.
2949 */
2950 update_stateid(&stp->st_stateid);
2951 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2952
2953out:
f2327d9a 2954 if (locku->lu_stateowner) {
1da177e4 2955 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2956 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2957 }
1da177e4
LT		 2958 nfs4_unlock_state();
2959 return status;
2960
2961out_nfserr:
b8dd7b9a 2962 status = nfserrno(err);
1da177e4
LT		 2963 goto out;
2964}
2965
2966/*
2967 * returns
2968 * 1: locks held by lockowner
2969 * 0: no locks held by lockowner
2970 */
2971static int
2972check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2973{
2974 struct file_lock **flpp;
7eaa36e2 2975 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2976 int status = 0;
2977
2978 lock_kernel();
2979 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2980 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2981 status = 1;
2982 goto out;
796dadfd 2983 }
1da177e4
LT		 2984 }
2985out:
2986 unlock_kernel();
2987 return status;
2988}
2989
b37ad28b 2990__be32
b591480b
BF		 2991nfsd4_release_lockowner(struct svc_rqst *rqstp,
2992 struct nfsd4_compound_state *cstate,
2993 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2994{
2995 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2996 struct nfs4_stateowner *sop;
2997 struct nfs4_stateid *stp;
1da177e4 2998 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2999 struct list_head matches;
3000 int i;
b37ad28b 3001 __be32 status;
1da177e4
LT		 3002
3003 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3004 clid->cl_boot, clid->cl_id);
3005
3006 /* XXX check for lease expiration */
3007
3008 status = nfserr_stale_clientid;
849823c5 3009 if (STALE_CLIENTID(clid))
1da177e4 3010 return status;
1da177e4
LT		 3011
3012 nfs4_lock_state();
3013
3e9e3dbe
N		 3014 status = nfserr_locks_held;
3015 /* XXX: we're doing a linear search through all the lockowners.
3016 * Yipes! For now we'll just hope clients aren't really using
3017 * release_lockowner much, but eventually we have to fix these
3018 * data structures. */
3019 INIT_LIST_HEAD(&matches);
3020 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3021 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3022 if (!cmp_owner_str(sop, owner, clid))
3023 continue;
3024 list_for_each_entry(stp, &sop->so_stateids,
3025 st_perstateowner) {
3026 if (check_for_locks(stp->st_vfs_file, sop))
3027 goto out;
3028 /* Note: so_perclient unused for lockowners,
3029 * so it's OK to fool with here. */
3030 list_add(&sop->so_perclient, &matches);
3031 }
1da177e4 3032 }
3e9e3dbe
N		 3033 }
3034 /* Clients probably won't expect us to return with some (but not all)
3035 * of the lockowner state released; so don't release any until all
3036 * have been checked. */
3037 status = nfs_ok;
0fa822e4
N		 3038 while (!list_empty(&matches)) {
3039 sop = list_entry(matches.next, struct nfs4_stateowner,
3040 so_perclient);
3041 /* unhash_stateowner deletes so_perclient only
3042 * for openowners. */
3043 list_del(&sop->so_perclient);
3e9e3dbe 3044 release_stateowner(sop);
1da177e4
LT		 3045 }
3046out:
3047 nfs4_unlock_state();
3048 return status;
3049}
3050
3051static inline struct nfs4_client_reclaim *
a55370a3 3052alloc_reclaim(void)
1da177e4 3053{
a55370a3 3054 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3055}
3056
c7b9a459
N		 3057int
3058nfs4_has_reclaimed_state(const char *name)
3059{
3060 unsigned int strhashval = clientstr_hashval(name);
3061 struct nfs4_client *clp;
3062
3063 clp = find_confirmed_client_by_str(name, strhashval);
3064 return clp ? 1 : 0;
3065}
3066
1da177e4
LT		 3067/*
3068 * failure => all reset bets are off, nfserr_no_grace...
3069 */
190e4fbf
N		 3070int
3071nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3072{
3073 unsigned int strhashval;
3074 struct nfs4_client_reclaim *crp = NULL;
3075
a55370a3
N		 3076 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3077 crp = alloc_reclaim();
1da177e4
LT		 3078 if (!crp)
3079 return 0;
a55370a3 3080 strhashval = clientstr_hashval(name);
1da177e4
LT		 3081 INIT_LIST_HEAD(&crp->cr_strhash);
3082 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3083 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3084 reclaim_str_hashtbl_size++;
3085 return 1;
3086}
3087
3088static void
3089nfs4_release_reclaim(void)
3090{
3091 struct nfs4_client_reclaim *crp = NULL;
3092 int i;
3093
1da177e4
LT		 3094 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3095 while (!list_empty(&reclaim_str_hashtbl[i])) {
3096 crp = list_entry(reclaim_str_hashtbl[i].next,
3097 struct nfs4_client_reclaim, cr_strhash);
3098 list_del(&crp->cr_strhash);
1da177e4
LT		 3099 kfree(crp);
3100 reclaim_str_hashtbl_size--;
3101 }
3102 }
3103 BUG_ON(reclaim_str_hashtbl_size);
3104}
3105
3106/*
3107 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3108static struct nfs4_client_reclaim *
1da177e4
LT		 3109nfs4_find_reclaim_client(clientid_t *clid)
3110{
3111 unsigned int strhashval;
3112 struct nfs4_client *clp;
3113 struct nfs4_client_reclaim *crp = NULL;
3114
3115
3116 /* find clientid in conf_id_hashtbl */
3117 clp = find_confirmed_client(clid);
3118 if (clp == NULL)
3119 return NULL;
3120
a55370a3
N		 3121 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3122 clp->cl_name.len, clp->cl_name.data,
3123 clp->cl_recdir);
1da177e4
LT		 3124
3125 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3126 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3127 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3128 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3129 return crp;
3130 }
3131 }
3132 return NULL;
3133}
3134
3135/*
3136* Called from OPEN. Look for clientid in reclaim list.
3137*/
b37ad28b 3138__be32
1da177e4
LT		 3139nfs4_check_open_reclaim(clientid_t *clid)
3140{
dfc83565 3141 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3142}
3143
ac4d8ff2 3144/* initialization to perform at module load time: */
1da177e4 3145
ac4d8ff2
N		 3146void
3147nfs4_state_init(void)
1da177e4
LT		 3148{
3149 int i;
1da177e4 3150
1da177e4
LT		 3151 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3152 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3153 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3154 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3155 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3156 }
3157 for (i = 0; i < FILE_HASH_SIZE; i++) {
3158 INIT_LIST_HEAD(&file_hashtbl[i]);
3159 }
3160 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3161 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3162 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3163 }
3164 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3165 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3166 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3167 }
3168 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3169 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3170 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3171 }
1da177e4 3172 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3173 INIT_LIST_HEAD(&close_lru);
3174 INIT_LIST_HEAD(&client_lru);
3175 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3176 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3177 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3178 reclaim_str_hashtbl_size = 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
ac4d8ff2
N		 3200/* initialization to perform when the nfsd service is started: */
3201
3202static void
3203__nfs4_state_start(void)
3204{
9a8db97e 3205 unsigned long grace_time;
ac4d8ff2 3206
1da177e4 3207 boot_time = get_seconds();
9a8db97e 3208 grace_time = get_nfs_grace_period();
d99a05ad 3209 lease_time = user_lease_time;
a76b4319 3210 in_grace = 1;
9a8db97e
ME		 3211 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3212 grace_time/HZ);
58da282b 3213 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3214 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
1da177e4
LT		 3215}
3216
3217int
76a3550e 3218nfs4_state_start(void)
1da177e4
LT		 3219{
3220 int status;
3221
3222 if (nfs4_init)
3223 return 0;
3224 status = nfsd4_init_slabs();
3225 if (status)
3226 return status;
190e4fbf 3227 nfsd4_load_reboot_recovery_data();
76a3550e 3228 __nfs4_state_start();
1da177e4
LT		 3229 nfs4_init = 1;
3230 return 0;
3231}
3232
3233int
3234nfs4_in_grace(void)
3235{
a76b4319 3236 return in_grace;
1da177e4
LT		 3237}
3238
3239time_t
3240nfs4_lease_time(void)
3241{
3242 return lease_time;
3243}
3244
3245static void
3246__nfs4_state_shutdown(void)
3247{
3248 int i;
3249 struct nfs4_client *clp = NULL;
3250 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3251 struct list_head *pos, *next, reaplist;
3252
1da177e4
LT		 3253 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3254 while (!list_empty(&conf_id_hashtbl[i])) {
3255 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3256 expire_client(clp);
3257 }
3258 while (!list_empty(&unconf_str_hashtbl[i])) {
3259 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3260 expire_client(clp);
3261 }
3262 }
3263 INIT_LIST_HEAD(&reaplist);
3264 spin_lock(&recall_lock);
3265 list_for_each_safe(pos, next, &del_recall_lru) {
3266 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3267 list_move(&dp->dl_recall_lru, &reaplist);
3268 }
3269 spin_unlock(&recall_lock);
3270 list_for_each_safe(pos, next, &reaplist) {
3271 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3272 list_del_init(&dp->dl_recall_lru);
3273 unhash_delegation(dp);
3274 }
3275
190e4fbf 3276 nfsd4_shutdown_recdir();
1da177e4 3277 nfs4_init = 0;
1da177e4
LT		 3278}
3279
3280void
3281nfs4_state_shutdown(void)
3282{
5e8d5c29
N		 3283 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3284 destroy_workqueue(laundry_wq);
1da177e4
LT		 3285 nfs4_lock_state();
3286 nfs4_release_reclaim();
3287 __nfs4_state_shutdown();
3288 nfsd4_free_slabs();
3289 nfs4_unlock_state();
3290}
3291
0964a3d3
N		 3292static void
3293nfs4_set_recdir(char *recdir)
3294{
3295 nfs4_lock_state();
3296 strcpy(user_recovery_dirname, recdir);
3297 nfs4_unlock_state();
3298}
3299
3300/*
3301 * Change the NFSv4 recovery directory to recdir.
3302 */
3303int
3304nfs4_reset_recoverydir(char *recdir)
3305{
3306 int status;
3307 struct nameidata nd;
3308
3309 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3310 if (status)
3311 return status;
3312 status = -ENOTDIR;
3313 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3314 nfs4_set_recdir(recdir);
3315 status = 0;
3316 }
3317 path_release(&nd);
3318 return status;
3319}
3320
1da177e4
LT		 3321/*
3322 * Called when leasetime is changed.
3323 *
d99a05ad
N		 3324 * The only way the protocol gives us to handle on-the-fly lease changes is to
3325 * simulate a reboot. Instead of doing that, we just wait till the next time
3326 * we start to register any changes in lease time. If the administrator
3327 * really wants to change the lease time *now*, they can go ahead and bring
3328 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3329 */
3330void
3331nfs4_reset_lease(time_t leasetime)
3332{
d99a05ad
N		 3333 lock_kernel();
3334 user_lease_time = leasetime;
3335 unlock_kernel();
1da177e4 3336}
Linux 6.x block layer and io_uring tree(s)