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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <[email protected]>
8* Andy Adamson <[email protected]>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
c2f1a551 52#include <linux/swap.h>
353ab6e9 53#include <linux/mutex.h>
fd85b817 54#include <linux/lockd/bind.h>
9a8db97e 55#include <linux/module.h>
1da177e4
LT		 56
57#define NFSDDBG_FACILITY NFSDDBG_PROC
58
59/* Globals */
60static time_t lease_time = 90; /* default lease time */
d99a05ad 61static time_t user_lease_time = 90;
fd39ca9a 62static time_t boot_time;
a76b4319 63static int in_grace = 1;
1da177e4
LT		 64static u32 current_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 152static int num_delegations;
c2f1a551 153unsigned int max_delegations;
ef0f3390
N		 154
155/*
156 * Open owner state (share locks)
157 */
158
159/* hash tables for nfs4_stateowner */
160#define OWNER_HASH_BITS 8
161#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
162#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
163
164#define ownerid_hashval(id) \
165 ((id) & OWNER_HASH_MASK)
166#define ownerstr_hashval(clientid, ownername) \
167 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
168
169static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
170static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
171
172/* hash table for nfs4_file */
173#define FILE_HASH_BITS 8
174#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
175#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
176/* hash table for (open)nfs4_stateid */
177#define STATEID_HASH_BITS 10
178#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
179#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
180
181#define file_hashval(x) \
182 hash_ptr(x, FILE_HASH_BITS)
183#define stateid_hashval(owner_id, file_id) \
184 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
185
186static struct list_head file_hashtbl[FILE_HASH_SIZE];
187static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
188
1da177e4
LT		 189static struct nfs4_delegation *
190alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
191{
192 struct nfs4_delegation *dp;
193 struct nfs4_file *fp = stp->st_file;
194 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
195
196 dprintk("NFSD alloc_init_deleg\n");
47f9940c
MS		 197 if (fp->fi_had_conflict)
198 return NULL;
c2f1a551 199 if (num_delegations > max_delegations)
ef0f3390 200 return NULL;
5b2d21c1
N		 201 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
202 if (dp == NULL)
1da177e4 203 return dp;
ef0f3390 204 num_delegations++;
ea1da636
N		 205 INIT_LIST_HEAD(&dp->dl_perfile);
206 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 207 INIT_LIST_HEAD(&dp->dl_recall_lru);
208 dp->dl_client = clp;
13cd2184 209 get_nfs4_file(fp);
1da177e4
LT		 210 dp->dl_file = fp;
211 dp->dl_flock = NULL;
212 get_file(stp->st_vfs_file);
213 dp->dl_vfs_file = stp->st_vfs_file;
214 dp->dl_type = type;
215 dp->dl_recall.cbr_dp = NULL;
216 dp->dl_recall.cbr_ident = cb->cb_ident;
217 dp->dl_recall.cbr_trunc = 0;
218 dp->dl_stateid.si_boot = boot_time;
219 dp->dl_stateid.si_stateownerid = current_delegid++;
220 dp->dl_stateid.si_fileid = 0;
221 dp->dl_stateid.si_generation = 0;
222 dp->dl_fhlen = current_fh->fh_handle.fh_size;
223 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
224 current_fh->fh_handle.fh_size);
225 dp->dl_time = 0;
226 atomic_set(&dp->dl_count, 1);
ea1da636
N		 227 list_add(&dp->dl_perfile, &fp->fi_delegations);
228 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 229 return dp;
230}
231
232void
233nfs4_put_delegation(struct nfs4_delegation *dp)
234{
235 if (atomic_dec_and_test(&dp->dl_count)) {
236 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 237 put_nfs4_file(dp->dl_file);
5b2d21c1 238 kmem_cache_free(deleg_slab, dp);
ef0f3390 239 num_delegations--;
1da177e4
LT		 240 }
241}
242
243/* Remove the associated file_lock first, then remove the delegation.
244 * lease_modify() is called to remove the FS_LEASE file_lock from
245 * the i_flock list, eventually calling nfsd's lock_manager
246 * fl_release_callback.
247 */
248static void
249nfs4_close_delegation(struct nfs4_delegation *dp)
250{
251 struct file *filp = dp->dl_vfs_file;
252
253 dprintk("NFSD: close_delegation dp %p\n",dp);
254 dp->dl_vfs_file = NULL;
255 /* The following nfsd_close may not actually close the file,
256 * but we want to remove the lease in any case. */
c907132d 257 if (dp->dl_flock)
a9933cea 258 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 259 nfsd_close(filp);
1da177e4
LT		 260}
261
262/* Called under the state lock. */
263static void
264unhash_delegation(struct nfs4_delegation *dp)
265{
ea1da636
N		 266 list_del_init(&dp->dl_perfile);
267 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 268 spin_lock(&recall_lock);
269 list_del_init(&dp->dl_recall_lru);
270 spin_unlock(&recall_lock);
271 nfs4_close_delegation(dp);
272 nfs4_put_delegation(dp);
273}
274
275/*
276 * SETCLIENTID state
277 */
278
279/* Hash tables for nfs4_clientid state */
280#define CLIENT_HASH_BITS 4
281#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
282#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
283
284#define clientid_hashval(id) \
285 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 286#define clientstr_hashval(name) \
287 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 288/*
289 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
290 * used in reboot/reset lease grace period processing
291 *
292 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
293 * setclientid_confirmed info.
294 *
295 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
296 * setclientid info.
297 *
298 * client_lru holds client queue ordered by nfs4_client.cl_time
299 * for lease renewal.
300 *
301 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
302 * for last close replay.
303 */
304static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
305static int reclaim_str_hashtbl_size = 0;
306static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
307static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
308static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
309static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
310static struct list_head client_lru;
311static struct list_head close_lru;
312
313static inline void
314renew_client(struct nfs4_client *clp)
315{
316 /*
317 * Move client to the end to the LRU list.
318 */
319 dprintk("renewing client (clientid %08x/%08x)\n",
320 clp->cl_clientid.cl_boot,
321 clp->cl_clientid.cl_id);
322 list_move_tail(&clp->cl_lru, &client_lru);
323 clp->cl_time = get_seconds();
324}
325
326/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
327static int
328STALE_CLIENTID(clientid_t *clid)
329{
330 if (clid->cl_boot == boot_time)
331 return 0;
332 dprintk("NFSD stale clientid (%08x/%08x)\n",
333 clid->cl_boot, clid->cl_id);
334 return 1;
335}
336
337/*
338 * XXX Should we use a slab cache ?
339 * This type of memory management is somewhat inefficient, but we use it
340 * anyway since SETCLIENTID is not a common operation.
341 */
35bba9a3 342static struct nfs4_client *alloc_client(struct xdr_netobj name)
1da177e4
LT		 343{
344 struct nfs4_client *clp;
345
35bba9a3
BF		 346 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
347 if (clp == NULL)
348 return NULL;
349 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
350 if (clp->cl_name.data == NULL) {
351 kfree(clp);
352 return NULL;
1da177e4 353 }
35bba9a3
BF		 354 memcpy(clp->cl_name.data, name.data, name.len);
355 clp->cl_name.len = name.len;
1da177e4
LT		 356 return clp;
357}
358
1b1a9b31
BF		 359static void
360shutdown_callback_client(struct nfs4_client *clp)
361{
362 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
363
1b1a9b31 364 if (clnt) {
404ec117
BF		 365 /*
366 * Callback threads take a reference on the client, so there
367 * should be no outstanding callbacks at this point.
368 */
1b1a9b31
BF		 369 clp->cl_callback.cb_client = NULL;
370 rpc_shutdown_client(clnt);
371 }
372}
373
1da177e4
LT		 374static inline void
375free_client(struct nfs4_client *clp)
376{
1b1a9b31 377 shutdown_callback_client(clp);
1da177e4
LT		 378 if (clp->cl_cred.cr_group_info)
379 put_group_info(clp->cl_cred.cr_group_info);
380 kfree(clp->cl_name.data);
381 kfree(clp);
382}
383
384void
385put_nfs4_client(struct nfs4_client *clp)
386{
387 if (atomic_dec_and_test(&clp->cl_count))
388 free_client(clp);
389}
390
391static void
392expire_client(struct nfs4_client *clp)
393{
394 struct nfs4_stateowner *sop;
395 struct nfs4_delegation *dp;
1da177e4
LT		 396 struct list_head reaplist;
397
398 dprintk("NFSD: expire_client cl_count %d\n",
399 atomic_read(&clp->cl_count));
400
1da177e4
LT		 401 INIT_LIST_HEAD(&reaplist);
402 spin_lock(&recall_lock);
ea1da636
N		 403 while (!list_empty(&clp->cl_delegations)) {
404 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 405 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
406 dp->dl_flock);
ea1da636 407 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 408 list_move(&dp->dl_recall_lru, &reaplist);
409 }
410 spin_unlock(&recall_lock);
411 while (!list_empty(&reaplist)) {
412 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
413 list_del_init(&dp->dl_recall_lru);
414 unhash_delegation(dp);
415 }
416 list_del(&clp->cl_idhash);
417 list_del(&clp->cl_strhash);
418 list_del(&clp->cl_lru);
ea1da636
N		 419 while (!list_empty(&clp->cl_openowners)) {
420 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 421 release_stateowner(sop);
422 }
423 put_nfs4_client(clp);
424}
425
35bba9a3
BF		 426static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
427{
1da177e4
LT		 428 struct nfs4_client *clp;
429
35bba9a3
BF		 430 clp = alloc_client(name);
431 if (clp == NULL)
432 return NULL;
a55370a3 433 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 434 atomic_set(&clp->cl_count, 1);
435 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 436 INIT_LIST_HEAD(&clp->cl_idhash);
437 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 438 INIT_LIST_HEAD(&clp->cl_openowners);
439 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4 440 INIT_LIST_HEAD(&clp->cl_lru);
1da177e4
LT		 441 return clp;
442}
443
35bba9a3
BF		 444static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
445{
446 memcpy(target->cl_verifier.data, source->data,
447 sizeof(target->cl_verifier.data));
1da177e4
LT		 448}
449
35bba9a3
BF		 450static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
451{
1da177e4
LT		 452 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
453 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
454}
455
35bba9a3
BF		 456static void copy_cred(struct svc_cred *target, struct svc_cred *source)
457{
1da177e4
LT		 458 target->cr_uid = source->cr_uid;
459 target->cr_gid = source->cr_gid;
460 target->cr_group_info = source->cr_group_info;
461 get_group_info(target->cr_group_info);
462}
463
35bba9a3 464static int same_name(const char *n1, const char *n2)
599e0a22 465{
a55370a3 466 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 467}
468
469static int
599e0a22
BF		 470same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
471{
472 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 473}
474
475static int
599e0a22
BF		 476same_clid(clientid_t *cl1, clientid_t *cl2)
477{
478 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 479}
480
481/* XXX what about NGROUP */
482static int
599e0a22
BF		 483same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
484{
485 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 486}
487
5ec7b46c
BF		 488static void gen_clid(struct nfs4_client *clp)
489{
490 static u32 current_clientid = 1;
491
1da177e4
LT		 492 clp->cl_clientid.cl_boot = boot_time;
493 clp->cl_clientid.cl_id = current_clientid++;
494}
495
deda2faa
BF		 496static void gen_confirm(struct nfs4_client *clp)
497{
498 static u32 i;
499 u32 *p;
1da177e4 500
1da177e4 501 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 502 *p++ = get_seconds();
503 *p++ = i++;
1da177e4
LT		 504}
505
35bba9a3
BF		 506static int check_name(struct xdr_netobj name)
507{
1da177e4
LT		 508 if (name.len == 0)
509 return 0;
510 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 511 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 512 return 0;
513 }
514 return 1;
515}
516
fd39ca9a 517static void
1da177e4
LT		 518add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
519{
520 unsigned int idhashval;
521
522 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
523 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
524 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
525 list_add_tail(&clp->cl_lru, &client_lru);
526 clp->cl_time = get_seconds();
527}
528
fd39ca9a 529static void
1da177e4
LT		 530move_to_confirmed(struct nfs4_client *clp)
531{
532 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
533 unsigned int strhashval;
534
535 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
536 list_del_init(&clp->cl_strhash);
f116629d 537 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 538 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 539 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
540 renew_client(clp);
541}
542
543static struct nfs4_client *
544find_confirmed_client(clientid_t *clid)
545{
546 struct nfs4_client *clp;
547 unsigned int idhashval = clientid_hashval(clid->cl_id);
548
549 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 550 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 551 return clp;
552 }
553 return NULL;
554}
555
556static struct nfs4_client *
557find_unconfirmed_client(clientid_t *clid)
558{
559 struct nfs4_client *clp;
560 unsigned int idhashval = clientid_hashval(clid->cl_id);
561
562 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 563 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 564 return clp;
565 }
566 return NULL;
567}
568
28ce6054
N		 569static struct nfs4_client *
570find_confirmed_client_by_str(const char *dname, unsigned int hashval)
571{
572 struct nfs4_client *clp;
573
574 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
575 if (same_name(clp->cl_recdir, dname))
576 return clp;
577 }
578 return NULL;
579}
580
581static struct nfs4_client *
582find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
583{
584 struct nfs4_client *clp;
585
586 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
587 if (same_name(clp->cl_recdir, dname))
588 return clp;
589 }
590 return NULL;
591}
592
1da177e4
LT		 593/* a helper function for parse_callback */
594static int
595parse_octet(unsigned int *lenp, char **addrp)
596{
597 unsigned int len = *lenp;
598 char *p = *addrp;
599 int n = -1;
600 char c;
601
602 for (;;) {
603 if (!len)
604 break;
605 len--;
606 c = *p++;
607 if (c == '.')
608 break;
609 if ((c < '0') || (c > '9')) {
610 n = -1;
611 break;
612 }
613 if (n < 0)
614 n = 0;
615 n = (n * 10) + (c - '0');
616 if (n > 255) {
617 n = -1;
618 break;
619 }
620 }
621 *lenp = len;
622 *addrp = p;
623 return n;
624}
625
626/* parse and set the setclientid ipv4 callback address */
fd39ca9a 627static int
1da177e4
LT		 628parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
629{
630 int temp = 0;
631 u32 cbaddr = 0;
632 u16 cbport = 0;
633 u32 addrlen = addr_len;
634 char *addr = addr_val;
635 int i, shift;
636
637 /* ipaddress */
638 shift = 24;
639 for(i = 4; i > 0 ; i--) {
640 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
641 return 0;
642 }
643 cbaddr |= (temp << shift);
644 if (shift > 0)
645 shift -= 8;
646 }
647 *cbaddrp = cbaddr;
648
649 /* port */
650 shift = 8;
651 for(i = 2; i > 0 ; i--) {
652 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
653 return 0;
654 }
655 cbport |= (temp << shift);
656 if (shift > 0)
657 shift -= 8;
658 }
659 *cbportp = cbport;
660 return 1;
661}
662
fd39ca9a 663static void
1da177e4
LT		 664gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
665{
666 struct nfs4_callback *cb = &clp->cl_callback;
667
668 /* Currently, we only support tcp for the callback channel */
669 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
670 goto out_err;
671
672 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
673 &cb->cb_addr, &cb->cb_port)))
674 goto out_err;
675 cb->cb_prog = se->se_callback_prog;
676 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 677 return;
678out_err:
849823c5 679 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 680 "will not receive delegations\n",
681 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
682
1da177e4
LT		 683 return;
684}
685
b37ad28b 686__be32
b591480b
BF		 687nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
688 struct nfsd4_setclientid *setclid)
1da177e4 689{
27459f09 690 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 691 struct xdr_netobj clname = {
692 .len = setclid->se_namelen,
693 .data = setclid->se_name,
694 };
695 nfs4_verifier clverifier = setclid->se_verf;
696 unsigned int strhashval;
28ce6054 697 struct nfs4_client *conf, *unconf, *new;
b37ad28b 698 __be32 status;
a55370a3 699 char dname[HEXDIR_LEN];
1da177e4 700
1da177e4 701 if (!check_name(clname))
73aea4ec 702 return nfserr_inval;
1da177e4 703
a55370a3
N		 704 status = nfs4_make_rec_clidname(dname, &clname);
705 if (status)
73aea4ec 706 return status;
a55370a3 707
1da177e4
LT		 708 /*
709 * XXX The Duplicate Request Cache (DRC) has been checked (??)
710 * We get here on a DRC miss.
711 */
712
a55370a3 713 strhashval = clientstr_hashval(dname);
1da177e4 714
1da177e4 715 nfs4_lock_state();
28ce6054
N		 716 conf = find_confirmed_client_by_str(dname, strhashval);
717 if (conf) {
a186e767 718 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 719 status = nfserr_clid_inuse;
599e0a22 720 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 721 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 722 dprintk("NFSD: setclientid: string in use by client"
723 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 724 goto out;
725 }
1da177e4 726 }
a186e767
BF		 727 /*
728 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
729 * has a description of SETCLIENTID request processing consisting
730 * of 5 bullet points, labeled as CASE0 - CASE4 below.
731 */
28ce6054 732 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 733 status = nfserr_resource;
734 if (!conf) {
a186e767
BF		 735 /*
736 * RFC 3530 14.2.33 CASE 4:
737 * placed first, because it is the normal case
1da177e4
LT		 738 */
739 if (unconf)
740 expire_client(unconf);
a55370a3
N		 741 new = create_client(clname, dname);
742 if (new == NULL)
1da177e4 743 goto out;
1da177e4 744 gen_clid(new);
599e0a22 745 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 746 /*
a186e767
BF		 747 * RFC 3530 14.2.33 CASE 1:
748 * probable callback update
1da177e4 749 */
31f4a6c1
N		 750 if (unconf) {
751 /* Note this is removing unconfirmed {*x***},
752 * which is stronger than RFC recommended {vxc**}.
753 * This has the advantage that there is at most
754 * one {*x***} in either list at any time.
755 */
756 expire_client(unconf);
1da177e4 757 }
a55370a3
N		 758 new = create_client(clname, dname);
759 if (new == NULL)
1da177e4 760 goto out;
1da177e4 761 copy_clid(new, conf);
1da177e4
LT		 762 } else if (!unconf) {
763 /*
a186e767
BF		 764 * RFC 3530 14.2.33 CASE 2:
765 * probable client reboot; state will be removed if
766 * confirmed.
1da177e4 767 */
a55370a3
N		 768 new = create_client(clname, dname);
769 if (new == NULL)
1da177e4 770 goto out;
1da177e4 771 gen_clid(new);
49ba8781 772 } else {
a186e767
BF		 773 /*
774 * RFC 3530 14.2.33 CASE 3:
775 * probable client reboot; state will be removed if
776 * confirmed.
1da177e4
LT		 777 */
778 expire_client(unconf);
a55370a3
N		 779 new = create_client(clname, dname);
780 if (new == NULL)
1da177e4 781 goto out;
1da177e4 782 gen_clid(new);
1da177e4 783 }
c175b83c
BF		 784 copy_verf(new, &clverifier);
785 new->cl_addr = sin->sin_addr.s_addr;
786 copy_cred(&new->cl_cred, &rqstp->rq_cred);
787 gen_confirm(new);
788 gen_callback(new, setclid);
789 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 790 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
791 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
792 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
793 status = nfs_ok;
794out:
795 nfs4_unlock_state();
796 return status;
797}
798
799
800/*
a186e767
BF		 801 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
802 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
803 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 804 */
b37ad28b 805__be32
b591480b
BF		 806nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
807 struct nfsd4_compound_state *cstate,
808 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 809{
27459f09 810 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 811 struct nfs4_client *conf, *unconf;
1da177e4
LT		 812 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
813 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 814 __be32 status;
1da177e4
LT		 815
816 if (STALE_CLIENTID(clid))
817 return nfserr_stale_clientid;
818 /*
819 * XXX The Duplicate Request Cache (DRC) has been checked (??)
820 * We get here on a DRC miss.
821 */
822
823 nfs4_lock_state();
21ab45a4
N		 824
825 conf = find_confirmed_client(clid);
826 unconf = find_unconfirmed_client(clid);
827
828 status = nfserr_clid_inuse;
27459f09 829 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 830 goto out;
27459f09 831 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 832 goto out;
833
a186e767
BF		 834 /*
835 * section 14.2.34 of RFC 3530 has a description of
836 * SETCLIENTID_CONFIRM request processing consisting
837 * of 4 bullet points, labeled as CASE1 - CASE4 below.
838 */
366e0c1d 839 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
a186e767
BF		 840 /*
841 * RFC 3530 14.2.34 CASE 1:
842 * callback update
843 */
599e0a22 844 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1da177e4
LT		 845 status = nfserr_clid_inuse;
846 else {
1a69c179
N		 847 /* XXX: We just turn off callbacks until we can handle
848 * change request correctly. */
cb36d634 849 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 850 gen_confirm(conf);
46309029 851 nfsd4_remove_clid_dir(unconf);
1a69c179 852 expire_client(unconf);
1da177e4 853 status = nfs_ok;
1a69c179 854
1da177e4 855 }
f3aba4e5 856 } else if (conf && !unconf) {
a186e767
BF		 857 /*
858 * RFC 3530 14.2.34 CASE 2:
859 * probable retransmitted request; play it safe and
860 * do nothing.
7c79f737 861 */
599e0a22 862 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1da177e4 863 status = nfserr_clid_inuse;
21ab45a4 864 else
1da177e4 865 status = nfs_ok;
7c79f737 866 } else if (!conf && unconf
599e0a22 867 && same_verf(&unconf->cl_confirm, &confirm)) {
a186e767
BF		 868 /*
869 * RFC 3530 14.2.34 CASE 3:
870 * Normal case; new or rebooted client:
7c79f737 871 */
599e0a22 872 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1da177e4
LT		 873 status = nfserr_clid_inuse;
874 } else {
1a69c179
N		 875 unsigned int hash =
876 clientstr_hashval(unconf->cl_recdir);
877 conf = find_confirmed_client_by_str(unconf->cl_recdir,
878 hash);
879 if (conf) {
c7b9a459 880 nfsd4_remove_clid_dir(conf);
1a69c179
N		 881 expire_client(conf);
882 }
1da177e4 883 move_to_confirmed(unconf);
21ab45a4 884 conf = unconf;
46f8a64b 885 nfsd4_probe_callback(conf);
1a69c179 886 status = nfs_ok;
1da177e4 887 }
599e0a22
BF		 888 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
889 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
7c79f737 890 &confirm)))) {
a186e767
BF		 891 /*
892 * RFC 3530 14.2.34 CASE 4:
893 * Client probably hasn't noticed that we rebooted yet.
7c79f737 894 */
1da177e4 895 status = nfserr_stale_clientid;
7c79f737 896 } else {
08e8987c
N		 897 /* check that we have hit one of the cases...*/
898 status = nfserr_clid_inuse;
899 }
1da177e4 900out:
1da177e4
LT		 901 nfs4_unlock_state();
902 return status;
903}
904
1da177e4
LT		 905/* OPEN Share state helper functions */
906static inline struct nfs4_file *
907alloc_init_file(struct inode *ino)
908{
909 struct nfs4_file *fp;
910 unsigned int hashval = file_hashval(ino);
911
e60d4398
N		 912 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
913 if (fp) {
13cd2184 914 kref_init(&fp->fi_ref);
1da177e4 915 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 916 INIT_LIST_HEAD(&fp->fi_stateids);
917 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 918 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
919 fp->fi_inode = igrab(ino);
920 fp->fi_id = current_fileid++;
47f9940c 921 fp->fi_had_conflict = false;
1da177e4
LT		 922 return fp;
923 }
924 return NULL;
925}
926
e60d4398 927static void
e18b890b 928nfsd4_free_slab(struct kmem_cache **slab)
1da177e4 929{
e60d4398
N		 930 if (*slab == NULL)
931 return;
1a1d92c1 932 kmem_cache_destroy(*slab);
e60d4398 933 *slab = NULL;
1da177e4
LT		 934}
935
e8ff2a84 936void
1da177e4
LT		 937nfsd4_free_slabs(void)
938{
e60d4398
N		 939 nfsd4_free_slab(&stateowner_slab);
940 nfsd4_free_slab(&file_slab);
5ac049ac 941 nfsd4_free_slab(&stateid_slab);
5b2d21c1 942 nfsd4_free_slab(&deleg_slab);
e60d4398 943}
1da177e4 944
e60d4398
N		 945static int
946nfsd4_init_slabs(void)
947{
948 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
20c2df83 949 sizeof(struct nfs4_stateowner), 0, 0, NULL);
e60d4398
N		 950 if (stateowner_slab == NULL)
951 goto out_nomem;
952 file_slab = kmem_cache_create("nfsd4_files",
20c2df83 953 sizeof(struct nfs4_file), 0, 0, NULL);
e60d4398
N		 954 if (file_slab == NULL)
955 goto out_nomem;
5ac049ac 956 stateid_slab = kmem_cache_create("nfsd4_stateids",
20c2df83 957 sizeof(struct nfs4_stateid), 0, 0, NULL);
5ac049ac
N		 958 if (stateid_slab == NULL)
959 goto out_nomem;
5b2d21c1 960 deleg_slab = kmem_cache_create("nfsd4_delegations",
20c2df83 961 sizeof(struct nfs4_delegation), 0, 0, NULL);
5b2d21c1
N		 962 if (deleg_slab == NULL)
963 goto out_nomem;
e60d4398
N		 964 return 0;
965out_nomem:
966 nfsd4_free_slabs();
967 dprintk("nfsd4: out of memory while initializing nfsv4\n");
968 return -ENOMEM;
1da177e4
LT		 969}
970
971void
972nfs4_free_stateowner(struct kref *kref)
973{
974 struct nfs4_stateowner *sop =
975 container_of(kref, struct nfs4_stateowner, so_ref);
976 kfree(sop->so_owner.data);
977 kmem_cache_free(stateowner_slab, sop);
978}
979
980static inline struct nfs4_stateowner *
981alloc_stateowner(struct xdr_netobj *owner)
982{
983 struct nfs4_stateowner *sop;
984
985 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
986 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
987 memcpy(sop->so_owner.data, owner->data, owner->len);
988 sop->so_owner.len = owner->len;
989 kref_init(&sop->so_ref);
990 return sop;
991 }
992 kmem_cache_free(stateowner_slab, sop);
993 }
994 return NULL;
995}
996
997static struct nfs4_stateowner *
998alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
999 struct nfs4_stateowner *sop;
1000 struct nfs4_replay *rp;
1001 unsigned int idhashval;
1002
1003 if (!(sop = alloc_stateowner(&open->op_owner)))
1004 return NULL;
1005 idhashval = ownerid_hashval(current_ownerid);
1006 INIT_LIST_HEAD(&sop->so_idhash);
1007 INIT_LIST_HEAD(&sop->so_strhash);
1008 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1009 INIT_LIST_HEAD(&sop->so_stateids);
1010 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1011 INIT_LIST_HEAD(&sop->so_close_lru);
1012 sop->so_time = 0;
1013 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1014 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1015 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1016 sop->so_is_open_owner = 1;
1017 sop->so_id = current_ownerid++;
1018 sop->so_client = clp;
1019 sop->so_seqid = open->op_seqid;
1020 sop->so_confirmed = 0;
1021 rp = &sop->so_replay;
de1ae286 1022 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 1023 rp->rp_buflen = 0;
1024 rp->rp_buf = rp->rp_ibuf;
1025 return sop;
1026}
1027
1028static void
1029release_stateid_lockowners(struct nfs4_stateid *open_stp)
1030{
1031 struct nfs4_stateowner *lock_sop;
1032
ea1da636
N		 1033 while (!list_empty(&open_stp->st_lockowners)) {
1034 lock_sop = list_entry(open_stp->st_lockowners.next,
1035 struct nfs4_stateowner, so_perstateid);
1036 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1037 BUG_ON(lock_sop->so_is_open_owner);
1038 release_stateowner(lock_sop);
1039 }
1040}
1041
1042static void
1043unhash_stateowner(struct nfs4_stateowner *sop)
1044{
1045 struct nfs4_stateid *stp;
1046
1047 list_del(&sop->so_idhash);
1048 list_del(&sop->so_strhash);
6fa305de 1049 if (sop->so_is_open_owner)
1da177e4 1050 list_del(&sop->so_perclient);
ea1da636
N		 1051 list_del(&sop->so_perstateid);
1052 while (!list_empty(&sop->so_stateids)) {
1053 stp = list_entry(sop->so_stateids.next,
1054 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1055 if (sop->so_is_open_owner)
1056 release_stateid(stp, OPEN_STATE);
1057 else
1058 release_stateid(stp, LOCK_STATE);
1059 }
1060}
1061
1062static void
1063release_stateowner(struct nfs4_stateowner *sop)
1064{
1065 unhash_stateowner(sop);
1066 list_del(&sop->so_close_lru);
1067 nfs4_put_stateowner(sop);
1068}
1069
1070static inline void
1071init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1072 struct nfs4_stateowner *sop = open->op_stateowner;
1073 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1074
1075 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1076 INIT_LIST_HEAD(&stp->st_perstateowner);
1077 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1078 INIT_LIST_HEAD(&stp->st_perfile);
1079 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1080 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1081 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1082 stp->st_stateowner = sop;
13cd2184 1083 get_nfs4_file(fp);
1da177e4
LT		 1084 stp->st_file = fp;
1085 stp->st_stateid.si_boot = boot_time;
1086 stp->st_stateid.si_stateownerid = sop->so_id;
1087 stp->st_stateid.si_fileid = fp->fi_id;
1088 stp->st_stateid.si_generation = 0;
1089 stp->st_access_bmap = 0;
1090 stp->st_deny_bmap = 0;
1091 __set_bit(open->op_share_access, &stp->st_access_bmap);
1092 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1093 stp->st_openstp = NULL;
1da177e4
LT		 1094}
1095
1096static void
1097release_stateid(struct nfs4_stateid *stp, int flags)
1098{
1099 struct file *filp = stp->st_vfs_file;
1100
1101 list_del(&stp->st_hash);
1da177e4 1102 list_del(&stp->st_perfile);
ea1da636 1103 list_del(&stp->st_perstateowner);
1da177e4
LT		 1104 if (flags & OPEN_STATE) {
1105 release_stateid_lockowners(stp);
1106 stp->st_vfs_file = NULL;
1107 nfsd_close(filp);
1da177e4
LT		 1108 } else if (flags & LOCK_STATE)
1109 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1110 put_nfs4_file(stp->st_file);
5ac049ac 1111 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1112}
1113
fd39ca9a 1114static void
1da177e4
LT		 1115move_to_close_lru(struct nfs4_stateowner *sop)
1116{
1117 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1118
358dd55a 1119 list_move_tail(&sop->so_close_lru, &close_lru);
1da177e4
LT		 1120 sop->so_time = get_seconds();
1121}
1122
1da177e4 1123static int
599e0a22
BF		 1124same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1125 clientid_t *clid)
1126{
1127 return (sop->so_owner.len == owner->len) &&
1128 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1129 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1da177e4
LT		 1130}
1131
1132static struct nfs4_stateowner *
1133find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1134{
1135 struct nfs4_stateowner *so = NULL;
1136
1137 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 1138 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1da177e4
LT		 1139 return so;
1140 }
1141 return NULL;
1142}
1143
1144/* search file_hashtbl[] for file */
1145static struct nfs4_file *
1146find_file(struct inode *ino)
1147{
1148 unsigned int hashval = file_hashval(ino);
1149 struct nfs4_file *fp;
1150
1151 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1152 if (fp->fi_inode == ino) {
1153 get_nfs4_file(fp);
1da177e4 1154 return fp;
13cd2184 1155 }
1da177e4
LT		 1156 }
1157 return NULL;
1158}
1159
8838dc43 1160static inline int access_valid(u32 x)
ba5a6a19 1161{
8838dc43
BF		 1162 if (x < NFS4_SHARE_ACCESS_READ)
1163 return 0;
1164 if (x > NFS4_SHARE_ACCESS_BOTH)
1165 return 0;
1166 return 1;
ba5a6a19
BF		 1167}
1168
8838dc43 1169static inline int deny_valid(u32 x)
ba5a6a19 1170{
8838dc43
BF		 1171 /* Note: unlike access bits, deny bits may be zero. */
1172 return x <= NFS4_SHARE_DENY_BOTH;
ba5a6a19 1173}
1da177e4 1174
fd39ca9a 1175static void
1da177e4
LT		 1176set_access(unsigned int *access, unsigned long bmap) {
1177 int i;
1178
1179 *access = 0;
1180 for (i = 1; i < 4; i++) {
1181 if (test_bit(i, &bmap))
1182 *access |= i;
1183 }
1184}
1185
fd39ca9a 1186static void
1da177e4
LT		 1187set_deny(unsigned int *deny, unsigned long bmap) {
1188 int i;
1189
1190 *deny = 0;
1191 for (i = 0; i < 4; i++) {
1192 if (test_bit(i, &bmap))
1193 *deny |= i ;
1194 }
1195}
1196
1197static int
1198test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1199 unsigned int access, deny;
1200
1201 set_access(&access, stp->st_access_bmap);
1202 set_deny(&deny, stp->st_deny_bmap);
1203 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1204 return 0;
1205 return 1;
1206}
1207
1208/*
1209 * Called to check deny when READ with all zero stateid or
1210 * WRITE with all zero or all one stateid
1211 */
b37ad28b 1212static __be32
1da177e4
LT		 1213nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1214{
1215 struct inode *ino = current_fh->fh_dentry->d_inode;
1216 struct nfs4_file *fp;
1217 struct nfs4_stateid *stp;
b37ad28b 1218 __be32 ret;
1da177e4
LT		 1219
1220 dprintk("NFSD: nfs4_share_conflict\n");
1221
1222 fp = find_file(ino);
13cd2184
N		 1223 if (!fp)
1224 return nfs_ok;
b700949b 1225 ret = nfserr_locked;
1da177e4 1226 /* Search for conflicting share reservations */
13cd2184
N		 1227 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1228 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1229 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1230 goto out;
1da177e4 1231 }
13cd2184
N		 1232 ret = nfs_ok;
1233out:
1234 put_nfs4_file(fp);
1235 return ret;
1da177e4
LT		 1236}
1237
1238static inline void
1239nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1240{
1241 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1242 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1243 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1244 }
1245}
1246
1247/*
1248 * Recall a delegation
1249 */
1250static int
1251do_recall(void *__dp)
1252{
1253 struct nfs4_delegation *dp = __dp;
1254
47f9940c 1255 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1256 nfsd4_cb_recall(dp);
1257 return 0;
1258}
1259
1260/*
1261 * Spawn a thread to perform a recall on the delegation represented
1262 * by the lease (file_lock)
1263 *
1264 * Called from break_lease() with lock_kernel() held.
1265 * Note: we assume break_lease will only call this *once* for any given
1266 * lease.
1267 */
1268static
1269void nfsd_break_deleg_cb(struct file_lock *fl)
1270{
1271 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1272 struct task_struct *t;
1273
1274 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1275 if (!dp)
1276 return;
1277
1278 /* We're assuming the state code never drops its reference
1279 * without first removing the lease. Since we're in this lease
1280 * callback (and since the lease code is serialized by the kernel
1281 * lock) we know the server hasn't removed the lease yet, we know
1282 * it's safe to take a reference: */
1283 atomic_inc(&dp->dl_count);
cfdcad4d 1284 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1285
1286 spin_lock(&recall_lock);
1287 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1288 spin_unlock(&recall_lock);
1289
1290 /* only place dl_time is set. protected by lock_kernel*/
1291 dp->dl_time = get_seconds();
1292
0272e1fd
BF		 1293 /*
1294 * We don't want the locks code to timeout the lease for us;
1295 * we'll remove it ourself if the delegation isn't returned
1296 * in time.
1297 */
1298 fl->fl_break_time = 0;
1da177e4
LT		 1299
1300 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1301 if (IS_ERR(t)) {
1302 struct nfs4_client *clp = dp->dl_client;
1303
1304 printk(KERN_INFO "NFSD: Callback thread failed for "
1305 "for client (clientid %08x/%08x)\n",
1306 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1307 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1308 nfs4_put_delegation(dp);
1309 }
1310}
1311
1312/*
1313 * The file_lock is being reapd.
1314 *
1315 * Called by locks_free_lock() with lock_kernel() held.
1316 */
1317static
1318void nfsd_release_deleg_cb(struct file_lock *fl)
1319{
1320 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1321
1322 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1323
1324 if (!(fl->fl_flags & FL_LEASE) || !dp)
1325 return;
1326 dp->dl_flock = NULL;
1327}
1328
1329/*
1330 * Set the delegation file_lock back pointer.
1331 *
a9933cea 1332 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1333 */
1334static
1335void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1336{
1337 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1338
1339 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1340 if (!dp)
1341 return;
1342 dp->dl_flock = new;
1343}
1344
1345/*
a9933cea 1346 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1347 */
1348static
1349int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1350{
1351 struct nfs4_delegation *onlistd =
1352 (struct nfs4_delegation *)onlist->fl_owner;
1353 struct nfs4_delegation *tryd =
1354 (struct nfs4_delegation *)try->fl_owner;
1355
1356 if (onlist->fl_lmops != try->fl_lmops)
1357 return 0;
1358
1359 return onlistd->dl_client == tryd->dl_client;
1360}
1361
1362
1363static
1364int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1365{
1366 if (arg & F_UNLCK)
1367 return lease_modify(onlist, arg);
1368 else
1369 return -EAGAIN;
1370}
1371
fd39ca9a 1372static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1373 .fl_break = nfsd_break_deleg_cb,
1374 .fl_release_private = nfsd_release_deleg_cb,
1375 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1376 .fl_mylease = nfsd_same_client_deleg_cb,
1377 .fl_change = nfsd_change_deleg_cb,
1378};
1379
1380
b37ad28b 1381__be32
1da177e4
LT		 1382nfsd4_process_open1(struct nfsd4_open *open)
1383{
1da177e4
LT		 1384 clientid_t *clientid = &open->op_clientid;
1385 struct nfs4_client *clp = NULL;
1386 unsigned int strhashval;
1387 struct nfs4_stateowner *sop = NULL;
1388
1da177e4 1389 if (!check_name(open->op_owner))
0f442aa2 1390 return nfserr_inval;
1da177e4
LT		 1391
1392 if (STALE_CLIENTID(&open->op_clientid))
1393 return nfserr_stale_clientid;
1394
1395 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1396 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1397 open->op_stateowner = sop;
1398 if (!sop) {
1399 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1400 clp = find_confirmed_client(clientid);
1401 if (clp == NULL)
0f442aa2
BF		 1402 return nfserr_expired;
1403 goto renew;
1da177e4 1404 }
0f442aa2
BF		 1405 if (!sop->so_confirmed) {
1406 /* Replace unconfirmed owners without checking for replay. */
1407 clp = sop->so_client;
1408 release_stateowner(sop);
1409 open->op_stateowner = NULL;
1410 goto renew;
1411 }
1412 if (open->op_seqid == sop->so_seqid - 1) {
1413 if (sop->so_replay.rp_buflen)
a90b061c 1414 return nfserr_replay_me;
0f442aa2
BF		 1415 /* The original OPEN failed so spectacularly
1416 * that we don't even have replay data saved!
1417 * Therefore, we have no choice but to continue
1418 * processing this OPEN; presumably, we'll
1419 * fail again for the same reason.
1420 */
1421 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1422 goto renew;
1423 }
1424 if (open->op_seqid != sop->so_seqid)
1425 return nfserr_bad_seqid;
1da177e4 1426renew:
0f442aa2
BF		 1427 if (open->op_stateowner == NULL) {
1428 sop = alloc_init_open_stateowner(strhashval, clp, open);
1429 if (sop == NULL)
1430 return nfserr_resource;
1431 open->op_stateowner = sop;
1432 }
1433 list_del_init(&sop->so_close_lru);
1da177e4 1434 renew_client(sop->so_client);
0f442aa2 1435 return nfs_ok;
1da177e4
LT		 1436}
1437
b37ad28b 1438static inline __be32
4a6e43e6
N		 1439nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1440{
1441 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1442 return nfserr_openmode;
1443 else
1444 return nfs_ok;
1445}
1446
52f4fb43
N		 1447static struct nfs4_delegation *
1448find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1449{
1450 struct nfs4_delegation *dp;
1451
ea1da636 1452 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1453 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1454 return dp;
1455 }
1456 return NULL;
1457}
1458
b37ad28b 1459static __be32
567d9829
N		 1460nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1461 struct nfs4_delegation **dp)
1462{
1463 int flags;
b37ad28b 1464 __be32 status = nfserr_bad_stateid;
567d9829
N		 1465
1466 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1467 if (*dp == NULL)
c44c5eeb 1468 goto out;
567d9829
N		 1469 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1470 RD_STATE : WR_STATE;
1471 status = nfs4_check_delegmode(*dp, flags);
1472 if (status)
1473 *dp = NULL;
c44c5eeb
N		 1474out:
1475 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1476 return nfs_ok;
1477 if (status)
1478 return status;
1479 open->op_stateowner->so_confirmed = 1;
1480 return nfs_ok;
567d9829
N		 1481}
1482
b37ad28b 1483static __be32
1da177e4
LT		 1484nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1485{
1486 struct nfs4_stateid *local;
b37ad28b 1487 __be32 status = nfserr_share_denied;
1da177e4
LT		 1488 struct nfs4_stateowner *sop = open->op_stateowner;
1489
8beefa24 1490 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1491 /* ignore lock owners */
1492 if (local->st_stateowner->so_is_open_owner == 0)
1493 continue;
1494 /* remember if we have seen this open owner */
1495 if (local->st_stateowner == sop)
1496 *stpp = local;
1497 /* check for conflicting share reservations */
1498 if (!test_share(local, open))
1499 goto out;
1500 }
1501 status = 0;
1502out:
1503 return status;
1504}
1505
5ac049ac
N		 1506static inline struct nfs4_stateid *
1507nfs4_alloc_stateid(void)
1508{
1509 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1510}
1511
b37ad28b 1512static __be32
1da177e4 1513nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1514 struct nfs4_delegation *dp,
1da177e4
LT		 1515 struct svc_fh *cur_fh, int flags)
1516{
1517 struct nfs4_stateid *stp;
1da177e4 1518
5ac049ac 1519 stp = nfs4_alloc_stateid();
1da177e4
LT		 1520 if (stp == NULL)
1521 return nfserr_resource;
1522
567d9829
N		 1523 if (dp) {
1524 get_file(dp->dl_vfs_file);
1525 stp->st_vfs_file = dp->dl_vfs_file;
1526 } else {
b37ad28b 1527 __be32 status;
567d9829
N		 1528 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1529 &stp->st_vfs_file);
1530 if (status) {
1531 if (status == nfserr_dropit)
1532 status = nfserr_jukebox;
5ac049ac 1533 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1534 return status;
1535 }
1da177e4 1536 }
1da177e4
LT		 1537 *stpp = stp;
1538 return 0;
1539}
1540
b37ad28b 1541static inline __be32
1da177e4
LT		 1542nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1543 struct nfsd4_open *open)
1544{
1545 struct iattr iattr = {
1546 .ia_valid = ATTR_SIZE,
1547 .ia_size = 0,
1548 };
1549 if (!open->op_truncate)
1550 return 0;
1551 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1552 return nfserr_inval;
1da177e4
LT		 1553 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1554}
1555
b37ad28b 1556static __be32
1da177e4
LT		 1557nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1558{
1559 struct file *filp = stp->st_vfs_file;
7eaa36e2 1560 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1561 unsigned int share_access, new_writer;
b37ad28b 1562 __be32 status;
1da177e4
LT		 1563
1564 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1565 new_writer = (~share_access) & open->op_share_access
1566 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1567
6c26d08f 1568 if (new_writer) {
b37ad28b
AV		 1569 int err = get_write_access(inode);
1570 if (err)
1571 return nfserrno(err);
6c26d08f 1572 }
1da177e4
LT		 1573 status = nfsd4_truncate(rqstp, cur_fh, open);
1574 if (status) {
6c26d08f
BF		 1575 if (new_writer)
1576 put_write_access(inode);
1da177e4
LT		 1577 return status;
1578 }
1579 /* remember the open */
6c26d08f 1580 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1581 set_bit(open->op_share_access, &stp->st_access_bmap);
1582 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1583
1584 return nfs_ok;
1585}
1586
1587
1da177e4 1588static void
37515177 1589nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1590{
37515177
N		 1591 open->op_stateowner->so_confirmed = 1;
1592 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1593}
1594
1595/*
1596 * Attempt to hand out a delegation.
1597 */
1598static void
1599nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1600{
1601 struct nfs4_delegation *dp;
1602 struct nfs4_stateowner *sop = stp->st_stateowner;
1603 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1604 struct file_lock fl, *flp = &fl;
1605 int status, flag = 0;
1606
1607 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1608 open->op_recall = 0;
1609 switch (open->op_claim_type) {
1610 case NFS4_OPEN_CLAIM_PREVIOUS:
1611 if (!atomic_read(&cb->cb_set))
1612 open->op_recall = 1;
1613 flag = open->op_delegate_type;
1614 if (flag == NFS4_OPEN_DELEGATE_NONE)
1615 goto out;
1616 break;
1617 case NFS4_OPEN_CLAIM_NULL:
1618 /* Let's not give out any delegations till everyone's
1619 * had the chance to reclaim theirs.... */
1620 if (nfs4_in_grace())
1621 goto out;
1622 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1623 goto out;
1624 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1625 flag = NFS4_OPEN_DELEGATE_WRITE;
1626 else
1627 flag = NFS4_OPEN_DELEGATE_READ;
1628 break;
1629 default:
1630 goto out;
1631 }
1da177e4
LT		 1632
1633 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1634 if (dp == NULL) {
1635 flag = NFS4_OPEN_DELEGATE_NONE;
1636 goto out;
1637 }
1638 locks_init_lock(&fl);
1639 fl.fl_lmops = &nfsd_lease_mng_ops;
1640 fl.fl_flags = FL_LEASE;
1641 fl.fl_end = OFFSET_MAX;
1642 fl.fl_owner = (fl_owner_t)dp;
1643 fl.fl_file = stp->st_vfs_file;
1644 fl.fl_pid = current->tgid;
1645
a9933cea 1646 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1647 * the lock_manager callbacks fl_mylease and fl_change are used
1648 */
a9933cea 1649 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1650 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1651 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1652 unhash_delegation(dp);
1da177e4
LT		 1653 flag = NFS4_OPEN_DELEGATE_NONE;
1654 goto out;
1655 }
1656
1657 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1658
1659 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1660 dp->dl_stateid.si_boot,
1661 dp->dl_stateid.si_stateownerid,
1662 dp->dl_stateid.si_fileid,
1663 dp->dl_stateid.si_generation);
1664out:
7b190fec
N		 1665 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1666 && flag == NFS4_OPEN_DELEGATE_NONE
1667 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1668 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1669 open->op_delegate_type = flag;
1670}
1671
1672/*
1673 * called with nfs4_lock_state() held.
1674 */
b37ad28b 1675__be32
1da177e4
LT		 1676nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1677{
1678 struct nfs4_file *fp = NULL;
1679 struct inode *ino = current_fh->fh_dentry->d_inode;
1680 struct nfs4_stateid *stp = NULL;
567d9829 1681 struct nfs4_delegation *dp = NULL;
b37ad28b 1682 __be32 status;
1da177e4
LT		 1683
1684 status = nfserr_inval;
ba5a6a19
BF		 1685 if (!access_valid(open->op_share_access)
1686 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1687 goto out;
1688 /*
1689 * Lookup file; if found, lookup stateid and check open request,
1690 * and check for delegations in the process of being recalled.
1691 * If not found, create the nfs4_file struct
1692 */
1693 fp = find_file(ino);
1694 if (fp) {
1695 if ((status = nfs4_check_open(fp, open, &stp)))
1696 goto out;
c44c5eeb
N		 1697 status = nfs4_check_deleg(fp, open, &dp);
1698 if (status)
1699 goto out;
1da177e4 1700 } else {
c44c5eeb
N		 1701 status = nfserr_bad_stateid;
1702 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1703 goto out;
1da177e4
LT		 1704 status = nfserr_resource;
1705 fp = alloc_init_file(ino);
1706 if (fp == NULL)
1707 goto out;
1708 }
1709
1710 /*
1711 * OPEN the file, or upgrade an existing OPEN.
1712 * If truncate fails, the OPEN fails.
1713 */
1714 if (stp) {
1715 /* Stateid was found, this is an OPEN upgrade */
1716 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1717 if (status)
1718 goto out;
444c2c07 1719 update_stateid(&stp->st_stateid);
1da177e4
LT		 1720 } else {
1721 /* Stateid was not found, this is a new OPEN */
1722 int flags = 0;
9ecb6a08
BF		 1723 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1724 flags |= MAY_READ;
1da177e4 1725 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1726 flags |= MAY_WRITE;
567d9829
N		 1727 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1728 if (status)
1da177e4
LT		 1729 goto out;
1730 init_stateid(stp, fp, open);
1731 status = nfsd4_truncate(rqstp, current_fh, open);
1732 if (status) {
1733 release_stateid(stp, OPEN_STATE);
1734 goto out;
1735 }
1736 }
1737 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1738
1739 /*
1740 * Attempt to hand out a delegation. No error return, because the
1741 * OPEN succeeds even if we fail.
1742 */
1743 nfs4_open_delegation(current_fh, open, stp);
1744
1745 status = nfs_ok;
1746
1747 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1748 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1749 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1750out:
13cd2184
N		 1751 if (fp)
1752 put_nfs4_file(fp);
37515177
N		 1753 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1754 nfs4_set_claim_prev(open);
1da177e4
LT		 1755 /*
1756 * To finish the open response, we just need to set the rflags.
1757 */
1758 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1759 if (!open->op_stateowner->so_confirmed)
1760 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1761
1762 return status;
1763}
1764
58da282b 1765static struct workqueue_struct *laundry_wq;
c4028958
DH		 1766static void laundromat_main(struct work_struct *);
1767static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1768
b37ad28b 1769__be32
b591480b
BF		 1770nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1771 clientid_t *clid)
1da177e4
LT		 1772{
1773 struct nfs4_client *clp;
b37ad28b 1774 __be32 status;
1da177e4
LT		 1775
1776 nfs4_lock_state();
1777 dprintk("process_renew(%08x/%08x): starting\n",
1778 clid->cl_boot, clid->cl_id);
1779 status = nfserr_stale_clientid;
1780 if (STALE_CLIENTID(clid))
1781 goto out;
1782 clp = find_confirmed_client(clid);
1783 status = nfserr_expired;
1784 if (clp == NULL) {
1785 /* We assume the client took too long to RENEW. */
1786 dprintk("nfsd4_renew: clientid not found!\n");
1787 goto out;
1788 }
1789 renew_client(clp);
1790 status = nfserr_cb_path_down;
ea1da636 1791 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1792 && !atomic_read(&clp->cl_callback.cb_set))
1793 goto out;
1794 status = nfs_ok;
1795out:
1796 nfs4_unlock_state();
1797 return status;
1798}
1799
a76b4319
N		 1800static void
1801end_grace(void)
1802{
1803 dprintk("NFSD: end of grace period\n");
c7b9a459 1804 nfsd4_recdir_purge_old();
a76b4319
N		 1805 in_grace = 0;
1806}
1807
fd39ca9a 1808static time_t
1da177e4
LT		 1809nfs4_laundromat(void)
1810{
1811 struct nfs4_client *clp;
1812 struct nfs4_stateowner *sop;
1813 struct nfs4_delegation *dp;
1814 struct list_head *pos, *next, reaplist;
1815 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1816 time_t t, clientid_val = NFSD_LEASE_TIME;
1817 time_t u, test_val = NFSD_LEASE_TIME;
1818
1819 nfs4_lock_state();
1820
1821 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1822 if (in_grace)
1823 end_grace();
1da177e4
LT		 1824 list_for_each_safe(pos, next, &client_lru) {
1825 clp = list_entry(pos, struct nfs4_client, cl_lru);
1826 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1827 t = clp->cl_time - cutoff;
1828 if (clientid_val > t)
1829 clientid_val = t;
1830 break;
1831 }
1832 dprintk("NFSD: purging unused client (clientid %08x)\n",
1833 clp->cl_clientid.cl_id);
c7b9a459 1834 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1835 expire_client(clp);
1836 }
1837 INIT_LIST_HEAD(&reaplist);
1838 spin_lock(&recall_lock);
1839 list_for_each_safe(pos, next, &del_recall_lru) {
1840 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1841 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1842 u = dp->dl_time - cutoff;
1843 if (test_val > u)
1844 test_val = u;
1845 break;
1846 }
1847 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1848 dp, dp->dl_flock);
1849 list_move(&dp->dl_recall_lru, &reaplist);
1850 }
1851 spin_unlock(&recall_lock);
1852 list_for_each_safe(pos, next, &reaplist) {
1853 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1854 list_del_init(&dp->dl_recall_lru);
1855 unhash_delegation(dp);
1856 }
1857 test_val = NFSD_LEASE_TIME;
1858 list_for_each_safe(pos, next, &close_lru) {
1859 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1860 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1861 u = sop->so_time - cutoff;
1862 if (test_val > u)
1863 test_val = u;
1864 break;
1865 }
1866 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1867 sop->so_id);
358dd55a 1868 release_stateowner(sop);
1da177e4
LT		 1869 }
1870 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1871 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1872 nfs4_unlock_state();
1873 return clientid_val;
1874}
1875
1876void
c4028958 1877laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1878{
1879 time_t t;
1880
1881 t = nfs4_laundromat();
1882 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1883 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1884}
1885
fd39ca9a 1886static struct nfs4_stateowner *
f8816512
N		 1887search_close_lru(u32 st_id, int flags)
1888{
1da177e4
LT		 1889 struct nfs4_stateowner *local = NULL;
1890
1da177e4
LT		 1891 if (flags & CLOSE_STATE) {
1892 list_for_each_entry(local, &close_lru, so_close_lru) {
1893 if (local->so_id == st_id)
1894 return local;
1895 }
1896 }
1897 return NULL;
1898}
1899
1900static inline int
1901nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1902{
7eaa36e2 1903 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1904}
1905
1906static int
1907STALE_STATEID(stateid_t *stateid)
1908{
1909 if (stateid->si_boot == boot_time)
1910 return 0;
849823c5 1911 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1912 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1913 stateid->si_generation);
1914 return 1;
1915}
1916
1917static inline int
1918access_permit_read(unsigned long access_bmap)
1919{
1920 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1921 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1922 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1923}
1924
1925static inline int
1926access_permit_write(unsigned long access_bmap)
1927{
1928 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1929 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1930}
1931
1932static
b37ad28b 1933__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1934{
b37ad28b 1935 __be32 status = nfserr_openmode;
1da177e4
LT		 1936
1937 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1938 goto out;
1939 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1940 goto out;
1941 status = nfs_ok;
1942out:
1943 return status;
1944}
1945
b37ad28b 1946static inline __be32
1da177e4
LT		 1947check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1948{
1949 /* Trying to call delegreturn with a special stateid? Yuch: */
1950 if (!(flags & (RD_STATE | WR_STATE)))
1951 return nfserr_bad_stateid;
1952 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1953 return nfs_ok;
1954 else if (nfs4_in_grace()) {
1955 /* Answer in remaining cases depends on existance of
1956 * conflicting state; so we must wait out the grace period. */
1957 return nfserr_grace;
1958 } else if (flags & WR_STATE)
1959 return nfs4_share_conflict(current_fh,
1960 NFS4_SHARE_DENY_WRITE);
1961 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1962 return nfs4_share_conflict(current_fh,
1963 NFS4_SHARE_DENY_READ);
1964}
1965
1966/*
1967 * Allow READ/WRITE during grace period on recovered state only for files
1968 * that are not able to provide mandatory locking.
1969 */
1970static inline int
1971io_during_grace_disallowed(struct inode *inode, int flags)
1972{
1973 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 1974 && mandatory_lock(inode);
1da177e4
LT		 1975}
1976
1977/*
1978* Checks for stateid operations
1979*/
b37ad28b 1980__be32
1da177e4
LT		 1981nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1982{
1983 struct nfs4_stateid *stp = NULL;
1984 struct nfs4_delegation *dp = NULL;
1985 stateid_t *stidp;
1986 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 1987 __be32 status;
1da177e4
LT		 1988
1989 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1990 stateid->si_boot, stateid->si_stateownerid,
1991 stateid->si_fileid, stateid->si_generation);
1992 if (filpp)
1993 *filpp = NULL;
1994
1995 if (io_during_grace_disallowed(ino, flags))
1996 return nfserr_grace;
1997
1998 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1999 return check_special_stateids(current_fh, stateid, flags);
2000
2001 /* STALE STATEID */
2002 status = nfserr_stale_stateid;
2003 if (STALE_STATEID(stateid))
2004 goto out;
2005
2006 /* BAD STATEID */
2007 status = nfserr_bad_stateid;
2008 if (!stateid->si_fileid) { /* delegation stateid */
2009 if(!(dp = find_delegation_stateid(ino, stateid))) {
2010 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2011 goto out;
2012 }
2013 stidp = &dp->dl_stateid;
2014 } else { /* open or lock stateid */
2015 if (!(stp = find_stateid(stateid, flags))) {
2016 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2017 goto out;
2018 }
2019 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2020 goto out;
2021 if (!stp->st_stateowner->so_confirmed)
2022 goto out;
2023 stidp = &stp->st_stateid;
2024 }
2025 if (stateid->si_generation > stidp->si_generation)
2026 goto out;
2027
2028 /* OLD STATEID */
2029 status = nfserr_old_stateid;
2030 if (stateid->si_generation < stidp->si_generation)
2031 goto out;
2032 if (stp) {
2033 if ((status = nfs4_check_openmode(stp,flags)))
2034 goto out;
2035 renew_client(stp->st_stateowner->so_client);
2036 if (filpp)
2037 *filpp = stp->st_vfs_file;
2038 } else if (dp) {
2039 if ((status = nfs4_check_delegmode(dp, flags)))
2040 goto out;
2041 renew_client(dp->dl_client);
2042 if (flags & DELEG_RET)
2043 unhash_delegation(dp);
2044 if (filpp)
2045 *filpp = dp->dl_vfs_file;
2046 }
2047 status = nfs_ok;
2048out:
2049 return status;
2050}
2051
4c4cd222
N		 2052static inline int
2053setlkflg (int type)
2054{
2055 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2056 RD_STATE : WR_STATE;
2057}
1da177e4
LT		 2058
2059/*
2060 * Checks for sequence id mutating operations.
2061 */
b37ad28b 2062static __be32
4c4cd222 2063nfs4_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 2064{
1da177e4
LT		 2065 struct nfs4_stateid *stp;
2066 struct nfs4_stateowner *sop;
2067
2068 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2069 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2070 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2071 stateid->si_generation);
3a4f98bb 2072
1da177e4
LT		 2073 *stpp = NULL;
2074 *sopp = NULL;
2075
1da177e4 2076 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2077 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2078 return nfserr_bad_stateid;
1da177e4
LT		 2079 }
2080
1da177e4 2081 if (STALE_STATEID(stateid))
3a4f98bb 2082 return nfserr_stale_stateid;
1da177e4
LT		 2083 /*
2084 * We return BAD_STATEID if filehandle doesn't match stateid,
2085 * the confirmed flag is incorrecly set, or the generation
2086 * number is incorrect.
1da177e4 2087 */
f8816512
N		 2088 stp = find_stateid(stateid, flags);
2089 if (stp == NULL) {
2090 /*
2091 * Also, we should make sure this isn't just the result of
2092 * a replayed close:
2093 */
2094 sop = search_close_lru(stateid->si_stateownerid, flags);
2095 if (sop == NULL)
2096 return nfserr_bad_stateid;
2097 *sopp = sop;
2098 goto check_replay;
2099 }
1da177e4 2100
39325bd0
BF		 2101 *stpp = stp;
2102 *sopp = sop = stp->st_stateowner;
2103
4c4cd222 2104 if (lock) {
4c4cd222 2105 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2106 struct nfs4_client *clp = sop->so_client;
4c4cd222 2107 int lkflg = 0;
b37ad28b 2108 __be32 status;
4c4cd222
N		 2109
2110 lkflg = setlkflg(lock->lk_type);
2111
2112 if (lock->lk_is_new) {
599e0a22
BF		 2113 if (!sop->so_is_open_owner)
2114 return nfserr_bad_stateid;
2115 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2116 return nfserr_bad_stateid;
599e0a22
BF		 2117 /* stp is the open stateid */
2118 status = nfs4_check_openmode(stp, lkflg);
2119 if (status)
2120 return status;
2121 } else {
2122 /* stp is the lock stateid */
2123 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2124 if (status)
2125 return status;
4c4cd222 2126 }
1da177e4
LT		 2127 }
2128
2129 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2130 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2131 return nfserr_bad_stateid;
1da177e4
LT		 2132 }
2133
1da177e4
LT		 2134 /*
2135 * We now validate the seqid and stateid generation numbers.
2136 * For the moment, we ignore the possibility of
2137 * generation number wraparound.
2138 */
bd9aac52 2139 if (seqid != sop->so_seqid)
1da177e4
LT		 2140 goto check_replay;
2141
3a4f98bb 2142 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2143 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2144 " unconfirmed stateowner!\n");
2145 return nfserr_bad_stateid;
1da177e4 2146 }
3a4f98bb 2147 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2148 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2149 " confirmed yet!\n");
2150 return nfserr_bad_stateid;
1da177e4
LT		 2151 }
2152 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2153 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2154 return nfserr_bad_stateid;
1da177e4
LT		 2155 }
2156
1da177e4 2157 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2158 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2159 return nfserr_old_stateid;
1da177e4 2160 }
52fd004e 2161 renew_client(sop->so_client);
3a4f98bb 2162 return nfs_ok;
1da177e4 2163
1da177e4 2164check_replay:
bd9aac52 2165 if (seqid == sop->so_seqid - 1) {
849823c5 2166 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2167 /* indicate replay to calling function */
a90b061c 2168 return nfserr_replay_me;
1da177e4 2169 }
2fdada03 2170 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2171 sop->so_seqid, seqid);
2172 *sopp = NULL;
2173 return nfserr_bad_seqid;
1da177e4
LT		 2174}
2175
b37ad28b 2176__be32
ca364317 2177nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2178 struct nfsd4_open_confirm *oc)
1da177e4 2179{
b37ad28b 2180 __be32 status;
1da177e4
LT		 2181 struct nfs4_stateowner *sop;
2182 struct nfs4_stateid *stp;
2183
2184 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2185 (int)cstate->current_fh.fh_dentry->d_name.len,
2186 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2187
ca364317 2188 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2189 if (status)
2190 return status;
1da177e4
LT		 2191
2192 nfs4_lock_state();
2193
ca364317
BF		 2194 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2195 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2196 CHECK_FH | CONFIRM | OPEN_STATE,
2197 &oc->oc_stateowner, &stp, NULL)))
2198 goto out;
2199
2200 sop = oc->oc_stateowner;
2201 sop->so_confirmed = 1;
2202 update_stateid(&stp->st_stateid);
2203 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2204 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2205 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2206 stp->st_stateid.si_boot,
2207 stp->st_stateid.si_stateownerid,
2208 stp->st_stateid.si_fileid,
2209 stp->st_stateid.si_generation);
c7b9a459
N		 2210
2211 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2212out:
f2327d9a 2213 if (oc->oc_stateowner) {
1da177e4 2214 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2215 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2216 }
1da177e4
LT		 2217 nfs4_unlock_state();
2218 return status;
2219}
2220
2221
2222/*
2223 * unset all bits in union bitmap (bmap) that
2224 * do not exist in share (from successful OPEN_DOWNGRADE)
2225 */
2226static void
2227reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2228{
2229 int i;
2230 for (i = 1; i < 4; i++) {
2231 if ((i & access) != i)
2232 __clear_bit(i, bmap);
2233 }
2234}
2235
2236static void
2237reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2238{
2239 int i;
2240 for (i = 0; i < 4; i++) {
2241 if ((i & deny) != i)
2242 __clear_bit(i, bmap);
2243 }
2244}
2245
b37ad28b 2246__be32
ca364317
BF		 2247nfsd4_open_downgrade(struct svc_rqst *rqstp,
2248 struct nfsd4_compound_state *cstate,
a4f1706a 2249 struct nfsd4_open_downgrade *od)
1da177e4 2250{
b37ad28b 2251 __be32 status;
1da177e4
LT		 2252 struct nfs4_stateid *stp;
2253 unsigned int share_access;
2254
2255 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2256 (int)cstate->current_fh.fh_dentry->d_name.len,
2257 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2258
ba5a6a19
BF		 2259 if (!access_valid(od->od_share_access)
2260 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2261 return nfserr_inval;
2262
2263 nfs4_lock_state();
ca364317
BF		 2264 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2265 od->od_seqid,
1da177e4
LT		 2266 &od->od_stateid,
2267 CHECK_FH | OPEN_STATE,
2268 &od->od_stateowner, &stp, NULL)))
2269 goto out;
2270
2271 status = nfserr_inval;
2272 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2273 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2274 stp->st_access_bmap, od->od_share_access);
2275 goto out;
2276 }
2277 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2278 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2279 stp->st_deny_bmap, od->od_share_deny);
2280 goto out;
2281 }
2282 set_access(&share_access, stp->st_access_bmap);
2283 nfs4_file_downgrade(stp->st_vfs_file,
2284 share_access & ~od->od_share_access);
2285
2286 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2287 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2288
2289 update_stateid(&stp->st_stateid);
2290 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2291 status = nfs_ok;
2292out:
f2327d9a 2293 if (od->od_stateowner) {
1da177e4 2294 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2295 cstate->replay_owner = od->od_stateowner;
f2327d9a 2296 }
1da177e4
LT		 2297 nfs4_unlock_state();
2298 return status;
2299}
2300
2301/*
2302 * nfs4_unlock_state() called after encode
2303 */
b37ad28b 2304__be32
ca364317 2305nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2306 struct nfsd4_close *close)
1da177e4 2307{
b37ad28b 2308 __be32 status;
1da177e4
LT		 2309 struct nfs4_stateid *stp;
2310
2311 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2312 (int)cstate->current_fh.fh_dentry->d_name.len,
2313 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2314
2315 nfs4_lock_state();
2316 /* check close_lru for replay */
ca364317
BF		 2317 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2318 close->cl_seqid,
1da177e4
LT		 2319 &close->cl_stateid,
2320 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2321 &close->cl_stateowner, &stp, NULL)))
2322 goto out;
1da177e4
LT		 2323 status = nfs_ok;
2324 update_stateid(&stp->st_stateid);
2325 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2326
04ef5954
BF		 2327 /* release_stateid() calls nfsd_close() if needed */
2328 release_stateid(stp, OPEN_STATE);
2329
2330 /* place unused nfs4_stateowners on so_close_lru list to be
2331 * released by the laundromat service after the lease period
2332 * to enable us to handle CLOSE replay
2333 */
2334 if (list_empty(&close->cl_stateowner->so_stateids))
2335 move_to_close_lru(close->cl_stateowner);
1da177e4 2336out:
f2327d9a 2337 if (close->cl_stateowner) {
1da177e4 2338 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2339 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2340 }
1da177e4
LT		 2341 nfs4_unlock_state();
2342 return status;
2343}
2344
b37ad28b 2345__be32
ca364317
BF		 2346nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2347 struct nfsd4_delegreturn *dr)
1da177e4 2348{
b37ad28b 2349 __be32 status;
1da177e4 2350
ca364317 2351 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2352 goto out;
2353
2354 nfs4_lock_state();
ca364317
BF		 2355 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2356 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2357 nfs4_unlock_state();
2358out:
2359 return status;
2360}
2361
2362
2363/*
2364 * Lock owner state (byte-range locks)
2365 */
2366#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2367#define LOCK_HASH_BITS 8
2368#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2369#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2370
2371#define lockownerid_hashval(id) \
2372 ((id) & LOCK_HASH_MASK)
2373
2374static inline unsigned int
2375lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2376 struct xdr_netobj *ownername)
2377{
2378 return (file_hashval(inode) + cl_id
2379 + opaque_hashval(ownername->data, ownername->len))
2380 & LOCK_HASH_MASK;
2381}
2382
2383static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2384static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2385static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2386
fd39ca9a 2387static struct nfs4_stateid *
1da177e4
LT		 2388find_stateid(stateid_t *stid, int flags)
2389{
2390 struct nfs4_stateid *local = NULL;
2391 u32 st_id = stid->si_stateownerid;
2392 u32 f_id = stid->si_fileid;
2393 unsigned int hashval;
2394
2395 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2396 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2397 hashval = stateid_hashval(st_id, f_id);
2398 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2399 if ((local->st_stateid.si_stateownerid == st_id) &&
2400 (local->st_stateid.si_fileid == f_id))
2401 return local;
2402 }
2403 }
2404 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2405 hashval = stateid_hashval(st_id, f_id);
2406 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2407 if ((local->st_stateid.si_stateownerid == st_id) &&
2408 (local->st_stateid.si_fileid == f_id))
2409 return local;
2410 }
849823c5 2411 }
1da177e4
LT		 2412 return NULL;
2413}
2414
2415static struct nfs4_delegation *
2416find_delegation_stateid(struct inode *ino, stateid_t *stid)
2417{
13cd2184
N		 2418 struct nfs4_file *fp;
2419 struct nfs4_delegation *dl;
1da177e4
LT		 2420
2421 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2422 stid->si_boot, stid->si_stateownerid,
2423 stid->si_fileid, stid->si_generation);
2424
1da177e4 2425 fp = find_file(ino);
13cd2184
N		 2426 if (!fp)
2427 return NULL;
2428 dl = find_delegation_file(fp, stid);
2429 put_nfs4_file(fp);
2430 return dl;
1da177e4
LT		 2431}
2432
2433/*
2434 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2435 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2436 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2437 * locking, this prevents us from being completely protocol-compliant. The
2438 * real solution to this problem is to start using unsigned file offsets in
2439 * the VFS, but this is a very deep change!
2440 */
2441static inline void
2442nfs4_transform_lock_offset(struct file_lock *lock)
2443{
2444 if (lock->fl_start < 0)
2445 lock->fl_start = OFFSET_MAX;
2446 if (lock->fl_end < 0)
2447 lock->fl_end = OFFSET_MAX;
2448}
2449
d5b9026a
N		 2450/* Hack!: For now, we're defining this just so we can use a pointer to it
2451 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2452static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2453};
1da177e4
LT		 2454
2455static inline void
2456nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2457{
d5b9026a
N		 2458 struct nfs4_stateowner *sop;
2459 unsigned int hval;
1da177e4 2460
d5b9026a
N		 2461 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2462 sop = (struct nfs4_stateowner *) fl->fl_owner;
2463 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2464 kref_get(&sop->so_ref);
2465 deny->ld_sop = sop;
2466 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2467 } else {
2468 deny->ld_sop = NULL;
2469 deny->ld_clientid.cl_boot = 0;
2470 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2471 }
2472 deny->ld_start = fl->fl_start;
2473 deny->ld_length = ~(u64)0;
2474 if (fl->fl_end != ~(u64)0)
2475 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2476 deny->ld_type = NFS4_READ_LT;
2477 if (fl->fl_type != F_RDLCK)
2478 deny->ld_type = NFS4_WRITE_LT;
2479}
2480
1da177e4
LT		 2481static struct nfs4_stateowner *
2482find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2483 struct xdr_netobj *owner)
2484{
2485 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2486 struct nfs4_stateowner *op;
2487
2488 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2489 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2490 return op;
2491 }
2492 return NULL;
2493}
2494
2495/*
2496 * Alloc a lock owner structure.
2497 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2498 * occured.
2499 *
2500 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2501 */
2502
2503static struct nfs4_stateowner *
2504alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2505 struct nfs4_stateowner *sop;
2506 struct nfs4_replay *rp;
2507 unsigned int idhashval;
2508
2509 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2510 return NULL;
2511 idhashval = lockownerid_hashval(current_ownerid);
2512 INIT_LIST_HEAD(&sop->so_idhash);
2513 INIT_LIST_HEAD(&sop->so_strhash);
2514 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2515 INIT_LIST_HEAD(&sop->so_stateids);
2516 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2517 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2518 sop->so_time = 0;
2519 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2520 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2521 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2522 sop->so_is_open_owner = 0;
2523 sop->so_id = current_ownerid++;
2524 sop->so_client = clp;
b59e3c0e
NB		 2525 /* It is the openowner seqid that will be incremented in encode in the
2526 * case of new lockowners; so increment the lock seqid manually: */
2527 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2528 sop->so_confirmed = 1;
2529 rp = &sop->so_replay;
de1ae286 2530 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2531 rp->rp_buflen = 0;
2532 rp->rp_buf = rp->rp_ibuf;
2533 return sop;
2534}
2535
fd39ca9a 2536static struct nfs4_stateid *
1da177e4
LT		 2537alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2538{
2539 struct nfs4_stateid *stp;
2540 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2541
5ac049ac
N		 2542 stp = nfs4_alloc_stateid();
2543 if (stp == NULL)
1da177e4
LT		 2544 goto out;
2545 INIT_LIST_HEAD(&stp->st_hash);
2546 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2547 INIT_LIST_HEAD(&stp->st_perstateowner);
2548 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2549 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2550 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2551 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2552 stp->st_stateowner = sop;
13cd2184 2553 get_nfs4_file(fp);
1da177e4
LT		 2554 stp->st_file = fp;
2555 stp->st_stateid.si_boot = boot_time;
2556 stp->st_stateid.si_stateownerid = sop->so_id;
2557 stp->st_stateid.si_fileid = fp->fi_id;
2558 stp->st_stateid.si_generation = 0;
2559 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2560 stp->st_access_bmap = open_stp->st_access_bmap;
2561 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2562 stp->st_openstp = open_stp;
1da177e4
LT		 2563
2564out:
2565 return stp;
2566}
2567
fd39ca9a 2568static int
1da177e4
LT		 2569check_lock_length(u64 offset, u64 length)
2570{
2571 return ((length == 0) || ((length != ~(u64)0) &&
2572 LOFF_OVERFLOW(offset, length)));
2573}
2574
2575/*
2576 * LOCK operation
2577 */
b37ad28b 2578__be32
ca364317 2579nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2580 struct nfsd4_lock *lock)
1da177e4 2581{
3e9e3dbe 2582 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2583 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2584 struct nfs4_stateid *lock_stp;
2585 struct file *filp;
2586 struct file_lock file_lock;
8dc7c311 2587 struct file_lock conflock;
b37ad28b 2588 __be32 status = 0;
1da177e4 2589 unsigned int strhashval;
150b3934 2590 unsigned int cmd;
b8dd7b9a 2591 int err;
1da177e4
LT		 2592
2593 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2594 (long long) lock->lk_offset,
2595 (long long) lock->lk_length);
2596
1da177e4
LT		 2597 if (check_lock_length(lock->lk_offset, lock->lk_length))
2598 return nfserr_inval;
2599
ca364317
BF		 2600 if ((status = fh_verify(rqstp, &cstate->current_fh,
2601 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2602 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2603 return status;
2604 }
2605
1da177e4
LT		 2606 nfs4_lock_state();
2607
2608 if (lock->lk_is_new) {
893f8770
N		 2609 /*
2610 * Client indicates that this is a new lockowner.
2611 * Use open owner and open stateid to create lock owner and
2612 * lock stateid.
2613 */
1da177e4
LT		 2614 struct nfs4_stateid *open_stp = NULL;
2615 struct nfs4_file *fp;
2616
2617 status = nfserr_stale_clientid;
849823c5 2618 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2619 goto out;
1da177e4 2620
1da177e4 2621 /* validate and update open stateid and open seqid */
ca364317 2622 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2623 lock->lk_new_open_seqid,
2624 &lock->lk_new_open_stateid,
2625 CHECK_FH | OPEN_STATE,
3a65588a 2626 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2627 lock);
37515177 2628 if (status)
1da177e4 2629 goto out;
3a65588a 2630 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2631 /* create lockowner and lock stateid */
2632 fp = open_stp->st_file;
2633 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2634 open_sop->so_client->cl_clientid.cl_id,
2635 &lock->v.new.owner);
3e9e3dbe
N		 2636 /* XXX: Do we need to check for duplicate stateowners on
2637 * the same file, or should they just be allowed (and
2638 * create new stateids)? */
1da177e4 2639 status = nfserr_resource;
b59e3c0e
NB		 2640 lock_sop = alloc_init_lock_stateowner(strhashval,
2641 open_sop->so_client, open_stp, lock);
2642 if (lock_sop == NULL)
1da177e4 2643 goto out;
b59e3c0e 2644 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2645 if (lock_stp == NULL)
1da177e4 2646 goto out;
1da177e4
LT		 2647 } else {
2648 /* lock (lock owner + lock stateid) already exists */
ca364317 2649 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2650 lock->lk_old_lock_seqid,
2651 &lock->lk_old_lock_stateid,
2652 CHECK_FH | LOCK_STATE,
3a65588a 2653 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2654 if (status)
2655 goto out;
3a65588a 2656 lock_sop = lock->lk_replay_owner;
1da177e4 2657 }
3a65588a 2658 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2659 filp = lock_stp->st_vfs_file;
2660
0dd395dc
N		 2661 status = nfserr_grace;
2662 if (nfs4_in_grace() && !lock->lk_reclaim)
2663 goto out;
2664 status = nfserr_no_grace;
2665 if (!nfs4_in_grace() && lock->lk_reclaim)
2666 goto out;
2667
1da177e4
LT		 2668 locks_init_lock(&file_lock);
2669 switch (lock->lk_type) {
2670 case NFS4_READ_LT:
2671 case NFS4_READW_LT:
2672 file_lock.fl_type = F_RDLCK;
150b3934 2673 cmd = F_SETLK;
1da177e4
LT		 2674 break;
2675 case NFS4_WRITE_LT:
2676 case NFS4_WRITEW_LT:
2677 file_lock.fl_type = F_WRLCK;
150b3934 2678 cmd = F_SETLK;
1da177e4
LT		 2679 break;
2680 default:
2681 status = nfserr_inval;
2682 goto out;
2683 }
b59e3c0e 2684 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2685 file_lock.fl_pid = current->tgid;
2686 file_lock.fl_file = filp;
2687 file_lock.fl_flags = FL_POSIX;
d5b9026a 2688 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2689
2690 file_lock.fl_start = lock->lk_offset;
2691 if ((lock->lk_length == ~(u64)0) ||
2692 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2693 file_lock.fl_end = ~(u64)0;
2694 else
2695 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2696 nfs4_transform_lock_offset(&file_lock);
2697
2698 /*
2699 * Try to lock the file in the VFS.
2700 * Note: locks.c uses the BKL to protect the inode's lock list.
2701 */
2702
eb76b3fd
AA		 2703 /* XXX?: Just to divert the locks_release_private at the start of
2704 * locks_copy_lock: */
150b3934 2705 locks_init_lock(&conflock);
fd85b817 2706 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2707 switch (-err) {
1da177e4
LT		 2708 case 0: /* success! */
2709 update_stateid(&lock_stp->st_stateid);
2710 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2711 sizeof(stateid_t));
b8dd7b9a 2712 status = 0;
eb76b3fd
AA		 2713 break;
2714 case (EAGAIN): /* conflock holds conflicting lock */
2715 status = nfserr_denied;
2716 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2717 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2718 break;
1da177e4
LT		 2719 case (EDEADLK):
2720 status = nfserr_deadlock;
eb76b3fd 2721 break;
1da177e4 2722 default:
fd85b817 2723 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2724 status = nfserr_resource;
2725 break;
1da177e4 2726 }
1da177e4 2727out:
8a280510
BF		 2728 if (status && lock->lk_is_new && lock_sop)
2729 release_stateowner(lock_sop);
3a65588a
BF		 2730 if (lock->lk_replay_owner) {
2731 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2732 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2733 }
1da177e4
LT		 2734 nfs4_unlock_state();
2735 return status;
2736}
2737
2738/*
2739 * LOCKT operation
2740 */
b37ad28b 2741__be32
ca364317
BF		 2742nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2743 struct nfsd4_lockt *lockt)
1da177e4
LT		 2744{
2745 struct inode *inode;
2746 struct file file;
2747 struct file_lock file_lock;
fd85b817 2748 int error;
b37ad28b 2749 __be32 status;
1da177e4
LT		 2750
2751 if (nfs4_in_grace())
2752 return nfserr_grace;
2753
2754 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2755 return nfserr_inval;
2756
2757 lockt->lt_stateowner = NULL;
2758 nfs4_lock_state();
2759
2760 status = nfserr_stale_clientid;
849823c5 2761 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2762 goto out;
1da177e4 2763
ca364317 2764 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2765 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2766 if (status == nfserr_symlink)
2767 status = nfserr_inval;
2768 goto out;
2769 }
2770
ca364317 2771 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2772 locks_init_lock(&file_lock);
2773 switch (lockt->lt_type) {
2774 case NFS4_READ_LT:
2775 case NFS4_READW_LT:
2776 file_lock.fl_type = F_RDLCK;
2777 break;
2778 case NFS4_WRITE_LT:
2779 case NFS4_WRITEW_LT:
2780 file_lock.fl_type = F_WRLCK;
2781 break;
2782 default:
2fdada03 2783 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2784 status = nfserr_inval;
2785 goto out;
2786 }
2787
2788 lockt->lt_stateowner = find_lockstateowner_str(inode,
2789 &lockt->lt_clientid, &lockt->lt_owner);
2790 if (lockt->lt_stateowner)
2791 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2792 file_lock.fl_pid = current->tgid;
2793 file_lock.fl_flags = FL_POSIX;
d5b9026a 2794 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2795
2796 file_lock.fl_start = lockt->lt_offset;
2797 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2798 file_lock.fl_end = ~(u64)0;
2799 else
2800 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2801
2802 nfs4_transform_lock_offset(&file_lock);
2803
fd85b817 2804 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2805 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2806 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2807 * only the dentry:inode set.
2808 */
2809 memset(&file, 0, sizeof (struct file));
ca364317 2810 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2811
2812 status = nfs_ok;
fd85b817
ME		 2813 error = vfs_test_lock(&file, &file_lock);
2814 if (error) {
2815 status = nfserrno(error);
2816 goto out;
2817 }
9d6a8c5c 2818 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2819 status = nfserr_denied;
9d6a8c5c 2820 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2821 }
2822out:
2823 nfs4_unlock_state();
2824 return status;
2825}
2826
b37ad28b 2827__be32
ca364317 2828nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2829 struct nfsd4_locku *locku)
1da177e4
LT		 2830{
2831 struct nfs4_stateid *stp;
2832 struct file *filp = NULL;
2833 struct file_lock file_lock;
b37ad28b 2834 __be32 status;
b8dd7b9a 2835 int err;
1da177e4
LT		 2836
2837 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2838 (long long) locku->lu_offset,
2839 (long long) locku->lu_length);
2840
2841 if (check_lock_length(locku->lu_offset, locku->lu_length))
2842 return nfserr_inval;
2843
2844 nfs4_lock_state();
2845
ca364317 2846 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2847 locku->lu_seqid,
2848 &locku->lu_stateid,
2849 CHECK_FH | LOCK_STATE,
2850 &locku->lu_stateowner, &stp, NULL)))
2851 goto out;
2852
2853 filp = stp->st_vfs_file;
2854 BUG_ON(!filp);
2855 locks_init_lock(&file_lock);
2856 file_lock.fl_type = F_UNLCK;
2857 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2858 file_lock.fl_pid = current->tgid;
2859 file_lock.fl_file = filp;
2860 file_lock.fl_flags = FL_POSIX;
d5b9026a 2861 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2862 file_lock.fl_start = locku->lu_offset;
2863
2864 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2865 file_lock.fl_end = ~(u64)0;
2866 else
2867 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2868 nfs4_transform_lock_offset(&file_lock);
2869
2870 /*
2871 * Try to unlock the file in the VFS.
2872 */
fd85b817 2873 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2874 if (err) {
fd85b817 2875 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2876 goto out_nfserr;
2877 }
2878 /*
2879 * OK, unlock succeeded; the only thing left to do is update the stateid.
2880 */
2881 update_stateid(&stp->st_stateid);
2882 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2883
2884out:
f2327d9a 2885 if (locku->lu_stateowner) {
1da177e4 2886 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2887 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2888 }
1da177e4
LT		 2889 nfs4_unlock_state();
2890 return status;
2891
2892out_nfserr:
b8dd7b9a 2893 status = nfserrno(err);
1da177e4
LT		 2894 goto out;
2895}
2896
2897/*
2898 * returns
2899 * 1: locks held by lockowner
2900 * 0: no locks held by lockowner
2901 */
2902static int
2903check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2904{
2905 struct file_lock **flpp;
7eaa36e2 2906 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2907 int status = 0;
2908
2909 lock_kernel();
2910 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2911 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2912 status = 1;
2913 goto out;
796dadfd 2914 }
1da177e4
LT		 2915 }
2916out:
2917 unlock_kernel();
2918 return status;
2919}
2920
b37ad28b 2921__be32
b591480b
BF		 2922nfsd4_release_lockowner(struct svc_rqst *rqstp,
2923 struct nfsd4_compound_state *cstate,
2924 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2925{
2926 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2927 struct nfs4_stateowner *sop;
2928 struct nfs4_stateid *stp;
1da177e4 2929 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2930 struct list_head matches;
2931 int i;
b37ad28b 2932 __be32 status;
1da177e4
LT		 2933
2934 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2935 clid->cl_boot, clid->cl_id);
2936
2937 /* XXX check for lease expiration */
2938
2939 status = nfserr_stale_clientid;
849823c5 2940 if (STALE_CLIENTID(clid))
1da177e4 2941 return status;
1da177e4
LT		 2942
2943 nfs4_lock_state();
2944
3e9e3dbe
N		 2945 status = nfserr_locks_held;
2946 /* XXX: we're doing a linear search through all the lockowners.
2947 * Yipes! For now we'll just hope clients aren't really using
2948 * release_lockowner much, but eventually we have to fix these
2949 * data structures. */
2950 INIT_LIST_HEAD(&matches);
2951 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2952 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2953 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2954 continue;
2955 list_for_each_entry(stp, &sop->so_stateids,
2956 st_perstateowner) {
2957 if (check_for_locks(stp->st_vfs_file, sop))
2958 goto out;
2959 /* Note: so_perclient unused for lockowners,
2960 * so it's OK to fool with here. */
2961 list_add(&sop->so_perclient, &matches);
2962 }
1da177e4 2963 }
3e9e3dbe
N		 2964 }
2965 /* Clients probably won't expect us to return with some (but not all)
2966 * of the lockowner state released; so don't release any until all
2967 * have been checked. */
2968 status = nfs_ok;
0fa822e4
N		 2969 while (!list_empty(&matches)) {
2970 sop = list_entry(matches.next, struct nfs4_stateowner,
2971 so_perclient);
2972 /* unhash_stateowner deletes so_perclient only
2973 * for openowners. */
2974 list_del(&sop->so_perclient);
3e9e3dbe 2975 release_stateowner(sop);
1da177e4
LT		 2976 }
2977out:
2978 nfs4_unlock_state();
2979 return status;
2980}
2981
2982static inline struct nfs4_client_reclaim *
a55370a3 2983alloc_reclaim(void)
1da177e4 2984{
a55370a3 2985 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 2986}
2987
c7b9a459
N		 2988int
2989nfs4_has_reclaimed_state(const char *name)
2990{
2991 unsigned int strhashval = clientstr_hashval(name);
2992 struct nfs4_client *clp;
2993
2994 clp = find_confirmed_client_by_str(name, strhashval);
2995 return clp ? 1 : 0;
2996}
2997
1da177e4
LT		 2998/*
2999 * failure => all reset bets are off, nfserr_no_grace...
3000 */
190e4fbf
N		 3001int
3002nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3003{
3004 unsigned int strhashval;
3005 struct nfs4_client_reclaim *crp = NULL;
3006
a55370a3
N		 3007 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3008 crp = alloc_reclaim();
1da177e4
LT		 3009 if (!crp)
3010 return 0;
a55370a3 3011 strhashval = clientstr_hashval(name);
1da177e4
LT		 3012 INIT_LIST_HEAD(&crp->cr_strhash);
3013 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3014 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3015 reclaim_str_hashtbl_size++;
3016 return 1;
3017}
3018
3019static void
3020nfs4_release_reclaim(void)
3021{
3022 struct nfs4_client_reclaim *crp = NULL;
3023 int i;
3024
1da177e4
LT		 3025 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3026 while (!list_empty(&reclaim_str_hashtbl[i])) {
3027 crp = list_entry(reclaim_str_hashtbl[i].next,
3028 struct nfs4_client_reclaim, cr_strhash);
3029 list_del(&crp->cr_strhash);
1da177e4
LT		 3030 kfree(crp);
3031 reclaim_str_hashtbl_size--;
3032 }
3033 }
3034 BUG_ON(reclaim_str_hashtbl_size);
3035}
3036
3037/*
3038 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3039static struct nfs4_client_reclaim *
1da177e4
LT		 3040nfs4_find_reclaim_client(clientid_t *clid)
3041{
3042 unsigned int strhashval;
3043 struct nfs4_client *clp;
3044 struct nfs4_client_reclaim *crp = NULL;
3045
3046
3047 /* find clientid in conf_id_hashtbl */
3048 clp = find_confirmed_client(clid);
3049 if (clp == NULL)
3050 return NULL;
3051
a55370a3
N		 3052 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3053 clp->cl_name.len, clp->cl_name.data,
3054 clp->cl_recdir);
1da177e4
LT		 3055
3056 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3057 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3058 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3059 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3060 return crp;
3061 }
3062 }
3063 return NULL;
3064}
3065
3066/*
3067* Called from OPEN. Look for clientid in reclaim list.
3068*/
b37ad28b 3069__be32
1da177e4
LT		 3070nfs4_check_open_reclaim(clientid_t *clid)
3071{
dfc83565 3072 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3073}
3074
ac4d8ff2 3075/* initialization to perform at module load time: */
1da177e4 3076
e8ff2a84 3077int
ac4d8ff2 3078nfs4_state_init(void)
1da177e4 3079{
e8ff2a84 3080 int i, status;
1da177e4 3081
e8ff2a84
BF		 3082 status = nfsd4_init_slabs();
3083 if (status)
3084 return status;
1da177e4
LT		 3085 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3086 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3087 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3088 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3089 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3090 }
3091 for (i = 0; i < FILE_HASH_SIZE; i++) {
3092 INIT_LIST_HEAD(&file_hashtbl[i]);
3093 }
3094 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3095 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3096 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3097 }
3098 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3099 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3100 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3101 }
3102 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3103 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3104 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3105 }
1da177e4 3106 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3107 INIT_LIST_HEAD(&close_lru);
3108 INIT_LIST_HEAD(&client_lru);
3109 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3110 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3111 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3112 reclaim_str_hashtbl_size = 0;
e8ff2a84 3113 return 0;
ac4d8ff2
N		 3114}
3115
190e4fbf
N		 3116static void
3117nfsd4_load_reboot_recovery_data(void)
3118{
3119 int status;
3120
0964a3d3
N		 3121 nfs4_lock_state();
3122 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3123 status = nfsd4_recdir_load();
0964a3d3 3124 nfs4_unlock_state();
190e4fbf
N		 3125 if (status)
3126 printk("NFSD: Failure reading reboot recovery data\n");
3127}
3128
9a8db97e
ME		 3129unsigned long
3130get_nfs4_grace_period(void)
3131{
3132 return max(user_lease_time, lease_time) * HZ;
3133}
3134
c2f1a551
MS		 3135/*
3136 * Since the lifetime of a delegation isn't limited to that of an open, a
3137 * client may quite reasonably hang on to a delegation as long as it has
3138 * the inode cached. This becomes an obvious problem the first time a
3139 * client's inode cache approaches the size of the server's total memory.
3140 *
3141 * For now we avoid this problem by imposing a hard limit on the number
3142 * of delegations, which varies according to the server's memory size.
3143 */
3144static void
3145set_max_delegations(void)
3146{
3147 /*
3148 * Allow at most 4 delegations per megabyte of RAM. Quick
3149 * estimates suggest that in the worst case (where every delegation
3150 * is for a different inode), a delegation could take about 1.5K,
3151 * giving a worst case usage of about 6% of memory.
3152 */
3153 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3154}
3155
ac4d8ff2
N		 3156/* initialization to perform when the nfsd service is started: */
3157
3158static void
3159__nfs4_state_start(void)
3160{
9a8db97e 3161 unsigned long grace_time;
ac4d8ff2 3162
1da177e4 3163 boot_time = get_seconds();
9a8db97e 3164 grace_time = get_nfs_grace_period();
d99a05ad 3165 lease_time = user_lease_time;
a76b4319 3166 in_grace = 1;
9a8db97e
ME		 3167 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3168 grace_time/HZ);
58da282b 3169 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3170 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3171 set_max_delegations();
1da177e4
LT		 3172}
3173
e8ff2a84 3174void
76a3550e 3175nfs4_state_start(void)
1da177e4 3176{
1da177e4 3177 if (nfs4_init)
e8ff2a84 3178 return;
190e4fbf 3179 nfsd4_load_reboot_recovery_data();
76a3550e 3180 __nfs4_state_start();
1da177e4 3181 nfs4_init = 1;
e8ff2a84 3182 return;
1da177e4
LT		 3183}
3184
3185int
3186nfs4_in_grace(void)
3187{
a76b4319 3188 return in_grace;
1da177e4
LT		 3189}
3190
3191time_t
3192nfs4_lease_time(void)
3193{
3194 return lease_time;
3195}
3196
3197static void
3198__nfs4_state_shutdown(void)
3199{
3200 int i;
3201 struct nfs4_client *clp = NULL;
3202 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3203 struct list_head *pos, *next, reaplist;
3204
1da177e4
LT		 3205 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3206 while (!list_empty(&conf_id_hashtbl[i])) {
3207 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3208 expire_client(clp);
3209 }
3210 while (!list_empty(&unconf_str_hashtbl[i])) {
3211 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3212 expire_client(clp);
3213 }
3214 }
3215 INIT_LIST_HEAD(&reaplist);
3216 spin_lock(&recall_lock);
3217 list_for_each_safe(pos, next, &del_recall_lru) {
3218 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3219 list_move(&dp->dl_recall_lru, &reaplist);
3220 }
3221 spin_unlock(&recall_lock);
3222 list_for_each_safe(pos, next, &reaplist) {
3223 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3224 list_del_init(&dp->dl_recall_lru);
3225 unhash_delegation(dp);
3226 }
3227
190e4fbf 3228 nfsd4_shutdown_recdir();
1da177e4 3229 nfs4_init = 0;
1da177e4
LT		 3230}
3231
3232void
3233nfs4_state_shutdown(void)
3234{
5e8d5c29
N		 3235 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3236 destroy_workqueue(laundry_wq);
1da177e4
LT		 3237 nfs4_lock_state();
3238 nfs4_release_reclaim();
3239 __nfs4_state_shutdown();
1da177e4
LT		 3240 nfs4_unlock_state();
3241}
3242
0964a3d3
N		 3243static void
3244nfs4_set_recdir(char *recdir)
3245{
3246 nfs4_lock_state();
3247 strcpy(user_recovery_dirname, recdir);
3248 nfs4_unlock_state();
3249}
3250
3251/*
3252 * Change the NFSv4 recovery directory to recdir.
3253 */
3254int
3255nfs4_reset_recoverydir(char *recdir)
3256{
3257 int status;
3258 struct nameidata nd;
3259
3260 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3261 if (status)
3262 return status;
3263 status = -ENOTDIR;
4ac91378 3264 if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
0964a3d3
N		 3265 nfs4_set_recdir(recdir);
3266 status = 0;
3267 }
1d957f9b 3268 path_put(&nd.path);
0964a3d3
N		 3269 return status;
3270}
3271
1da177e4
LT		 3272/*
3273 * Called when leasetime is changed.
3274 *
d99a05ad
N		 3275 * The only way the protocol gives us to handle on-the-fly lease changes is to
3276 * simulate a reboot. Instead of doing that, we just wait till the next time
3277 * we start to register any changes in lease time. If the administrator
3278 * really wants to change the lease time *now*, they can go ahead and bring
3279 * nfsd down and then back up again after changing the lease time.
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LT		 3280 */
3281void
3282nfs4_reset_lease(time_t leasetime)
3283{
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N		 3284 lock_kernel();
3285 user_lease_time = leasetime;
3286 unlock_kernel();
1da177e4 3287}
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