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nfsd4: make current_clientid local
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
c2f1a551 52#include <linux/swap.h>
353ab6e9 53#include <linux/mutex.h>
fd85b817 54#include <linux/lockd/bind.h>
9a8db97e 55#include <linux/module.h>
1da177e4
LT		 56
57#define NFSDDBG_FACILITY NFSDDBG_PROC
58
59/* Globals */
60static time_t lease_time = 90; /* default lease time */
d99a05ad 61static time_t user_lease_time = 90;
fd39ca9a 62static time_t boot_time;
a76b4319 63static int in_grace = 1;
1da177e4
LT		 64static u32 current_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 */
342static inline struct nfs4_client *
343alloc_client(struct xdr_netobj name)
344{
345 struct nfs4_client *clp;
346
f8314dc6 347 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
1da177e4
LT		 348 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
349 memcpy(clp->cl_name.data, name.data, name.len);
350 clp->cl_name.len = name.len;
351 }
352 else {
353 kfree(clp);
354 clp = NULL;
355 }
356 }
357 return clp;
358}
359
1b1a9b31
BF		 360static void
361shutdown_callback_client(struct nfs4_client *clp)
362{
363 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
364
365 /* shutdown rpc client, ending any outstanding recall rpcs */
366 if (clnt) {
367 clp->cl_callback.cb_client = NULL;
368 rpc_shutdown_client(clnt);
369 }
370}
371
1da177e4
LT		 372static inline void
373free_client(struct nfs4_client *clp)
374{
1b1a9b31 375 shutdown_callback_client(clp);
1da177e4
LT		 376 if (clp->cl_cred.cr_group_info)
377 put_group_info(clp->cl_cred.cr_group_info);
378 kfree(clp->cl_name.data);
379 kfree(clp);
380}
381
382void
383put_nfs4_client(struct nfs4_client *clp)
384{
385 if (atomic_dec_and_test(&clp->cl_count))
386 free_client(clp);
387}
388
389static void
390expire_client(struct nfs4_client *clp)
391{
392 struct nfs4_stateowner *sop;
393 struct nfs4_delegation *dp;
1da177e4
LT		 394 struct list_head reaplist;
395
396 dprintk("NFSD: expire_client cl_count %d\n",
397 atomic_read(&clp->cl_count));
398
1da177e4
LT		 399 INIT_LIST_HEAD(&reaplist);
400 spin_lock(&recall_lock);
ea1da636
N		 401 while (!list_empty(&clp->cl_delegations)) {
402 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 403 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
404 dp->dl_flock);
ea1da636 405 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 406 list_move(&dp->dl_recall_lru, &reaplist);
407 }
408 spin_unlock(&recall_lock);
409 while (!list_empty(&reaplist)) {
410 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
411 list_del_init(&dp->dl_recall_lru);
412 unhash_delegation(dp);
413 }
414 list_del(&clp->cl_idhash);
415 list_del(&clp->cl_strhash);
416 list_del(&clp->cl_lru);
ea1da636
N		 417 while (!list_empty(&clp->cl_openowners)) {
418 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 419 release_stateowner(sop);
420 }
421 put_nfs4_client(clp);
422}
423
424static struct nfs4_client *
a55370a3 425create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 426 struct nfs4_client *clp;
427
428 if (!(clp = alloc_client(name)))
429 goto out;
a55370a3 430 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 431 atomic_set(&clp->cl_count, 1);
432 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 433 INIT_LIST_HEAD(&clp->cl_idhash);
434 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 435 INIT_LIST_HEAD(&clp->cl_openowners);
436 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 437 INIT_LIST_HEAD(&clp->cl_lru);
438out:
439 return clp;
440}
441
442static void
443copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
444 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
445}
446
447static void
448copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
449 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
450 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
451}
452
453static void
454copy_cred(struct svc_cred *target, struct svc_cred *source) {
455
456 target->cr_uid = source->cr_uid;
457 target->cr_gid = source->cr_gid;
458 target->cr_group_info = source->cr_group_info;
459 get_group_info(target->cr_group_info);
460}
461
a55370a3 462static inline int
599e0a22
BF		 463same_name(const char *n1, const char *n2)
464{
a55370a3 465 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 466}
467
468static int
599e0a22
BF		 469same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
470{
471 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1da177e4
LT		 472}
473
474static int
599e0a22
BF		 475same_clid(clientid_t *cl1, clientid_t *cl2)
476{
477 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1da177e4
LT		 478}
479
480/* XXX what about NGROUP */
481static int
599e0a22
BF		 482same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
483{
484 return cr1->cr_uid == cr2->cr_uid;
1da177e4
LT		 485}
486
5ec7b46c
BF		 487static void gen_clid(struct nfs4_client *clp)
488{
489 static u32 current_clientid = 1;
490
1da177e4
LT		 491 clp->cl_clientid.cl_boot = boot_time;
492 clp->cl_clientid.cl_id = current_clientid++;
493}
494
deda2faa
BF		 495static void gen_confirm(struct nfs4_client *clp)
496{
497 static u32 i;
498 u32 *p;
1da177e4 499
1da177e4 500 p = (u32 *)clp->cl_confirm.data;
deda2faa
BF		 501 *p++ = get_seconds();
502 *p++ = i++;
1da177e4
LT		 503}
504
505static int
506check_name(struct xdr_netobj name) {
507
508 if (name.len == 0)
509 return 0;
510 if (name.len > NFS4_OPAQUE_LIMIT) {
2fdada03 511 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1da177e4
LT		 512 return 0;
513 }
514 return 1;
515}
516
fd39ca9a 517static void
1da177e4
LT		 518add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
519{
520 unsigned int idhashval;
521
522 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
523 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
524 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
525 list_add_tail(&clp->cl_lru, &client_lru);
526 clp->cl_time = get_seconds();
527}
528
fd39ca9a 529static void
1da177e4
LT		 530move_to_confirmed(struct nfs4_client *clp)
531{
532 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
533 unsigned int strhashval;
534
535 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
536 list_del_init(&clp->cl_strhash);
f116629d 537 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 538 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 539 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
540 renew_client(clp);
541}
542
543static struct nfs4_client *
544find_confirmed_client(clientid_t *clid)
545{
546 struct nfs4_client *clp;
547 unsigned int idhashval = clientid_hashval(clid->cl_id);
548
549 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 550 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 551 return clp;
552 }
553 return NULL;
554}
555
556static struct nfs4_client *
557find_unconfirmed_client(clientid_t *clid)
558{
559 struct nfs4_client *clp;
560 unsigned int idhashval = clientid_hashval(clid->cl_id);
561
562 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
599e0a22 563 if (same_clid(&clp->cl_clientid, clid))
1da177e4
LT		 564 return clp;
565 }
566 return NULL;
567}
568
28ce6054
N		 569static struct nfs4_client *
570find_confirmed_client_by_str(const char *dname, unsigned int hashval)
571{
572 struct nfs4_client *clp;
573
574 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
575 if (same_name(clp->cl_recdir, dname))
576 return clp;
577 }
578 return NULL;
579}
580
581static struct nfs4_client *
582find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
583{
584 struct nfs4_client *clp;
585
586 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
587 if (same_name(clp->cl_recdir, dname))
588 return clp;
589 }
590 return NULL;
591}
592
1da177e4
LT		 593/* a helper function for parse_callback */
594static int
595parse_octet(unsigned int *lenp, char **addrp)
596{
597 unsigned int len = *lenp;
598 char *p = *addrp;
599 int n = -1;
600 char c;
601
602 for (;;) {
603 if (!len)
604 break;
605 len--;
606 c = *p++;
607 if (c == '.')
608 break;
609 if ((c < '0') || (c > '9')) {
610 n = -1;
611 break;
612 }
613 if (n < 0)
614 n = 0;
615 n = (n * 10) + (c - '0');
616 if (n > 255) {
617 n = -1;
618 break;
619 }
620 }
621 *lenp = len;
622 *addrp = p;
623 return n;
624}
625
626/* parse and set the setclientid ipv4 callback address */
fd39ca9a 627static int
1da177e4
LT		 628parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
629{
630 int temp = 0;
631 u32 cbaddr = 0;
632 u16 cbport = 0;
633 u32 addrlen = addr_len;
634 char *addr = addr_val;
635 int i, shift;
636
637 /* ipaddress */
638 shift = 24;
639 for(i = 4; i > 0 ; i--) {
640 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
641 return 0;
642 }
643 cbaddr |= (temp << shift);
644 if (shift > 0)
645 shift -= 8;
646 }
647 *cbaddrp = cbaddr;
648
649 /* port */
650 shift = 8;
651 for(i = 2; i > 0 ; i--) {
652 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
653 return 0;
654 }
655 cbport |= (temp << shift);
656 if (shift > 0)
657 shift -= 8;
658 }
659 *cbportp = cbport;
660 return 1;
661}
662
fd39ca9a 663static void
1da177e4
LT		 664gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
665{
666 struct nfs4_callback *cb = &clp->cl_callback;
667
668 /* Currently, we only support tcp for the callback channel */
669 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
670 goto out_err;
671
672 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
673 &cb->cb_addr, &cb->cb_port)))
674 goto out_err;
675 cb->cb_prog = se->se_callback_prog;
676 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 677 return;
678out_err:
849823c5 679 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 680 "will not receive delegations\n",
681 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
682
1da177e4
LT		 683 return;
684}
685
b37ad28b 686__be32
b591480b
BF		 687nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
688 struct nfsd4_setclientid *setclid)
1da177e4 689{
27459f09 690 struct sockaddr_in *sin = svc_addr_in(rqstp);
1da177e4
LT		 691 struct xdr_netobj clname = {
692 .len = setclid->se_namelen,
693 .data = setclid->se_name,
694 };
695 nfs4_verifier clverifier = setclid->se_verf;
696 unsigned int strhashval;
28ce6054 697 struct nfs4_client *conf, *unconf, *new;
b37ad28b 698 __be32 status;
a55370a3 699 char dname[HEXDIR_LEN];
1da177e4 700
1da177e4 701 if (!check_name(clname))
73aea4ec 702 return nfserr_inval;
1da177e4 703
a55370a3
N		 704 status = nfs4_make_rec_clidname(dname, &clname);
705 if (status)
73aea4ec 706 return status;
a55370a3 707
1da177e4
LT		 708 /*
709 * XXX The Duplicate Request Cache (DRC) has been checked (??)
710 * We get here on a DRC miss.
711 */
712
a55370a3 713 strhashval = clientstr_hashval(dname);
1da177e4 714
1da177e4 715 nfs4_lock_state();
28ce6054
N		 716 conf = find_confirmed_client_by_str(dname, strhashval);
717 if (conf) {
a186e767 718 /* RFC 3530 14.2.33 CASE 0: */
1da177e4 719 status = nfserr_clid_inuse;
599e0a22 720 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
27459f09 721 || conf->cl_addr != sin->sin_addr.s_addr) {
21315edd
BF		 722 dprintk("NFSD: setclientid: string in use by client"
723 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
1da177e4
LT		 724 goto out;
725 }
1da177e4 726 }
a186e767
BF		 727 /*
728 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
729 * has a description of SETCLIENTID request processing consisting
730 * of 5 bullet points, labeled as CASE0 - CASE4 below.
731 */
28ce6054 732 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 733 status = nfserr_resource;
734 if (!conf) {
a186e767
BF		 735 /*
736 * RFC 3530 14.2.33 CASE 4:
737 * placed first, because it is the normal case
1da177e4
LT		 738 */
739 if (unconf)
740 expire_client(unconf);
a55370a3
N		 741 new = create_client(clname, dname);
742 if (new == NULL)
1da177e4 743 goto out;
1da177e4 744 gen_clid(new);
599e0a22 745 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1da177e4 746 /*
a186e767
BF		 747 * RFC 3530 14.2.33 CASE 1:
748 * probable callback update
1da177e4 749 */
31f4a6c1
N		 750 if (unconf) {
751 /* Note this is removing unconfirmed {*x***},
752 * which is stronger than RFC recommended {vxc**}.
753 * This has the advantage that there is at most
754 * one {*x***} in either list at any time.
755 */
756 expire_client(unconf);
1da177e4 757 }
a55370a3
N		 758 new = create_client(clname, dname);
759 if (new == NULL)
1da177e4 760 goto out;
1da177e4 761 copy_clid(new, conf);
1da177e4
LT		 762 } else if (!unconf) {
763 /*
a186e767
BF		 764 * RFC 3530 14.2.33 CASE 2:
765 * probable client reboot; state will be removed if
766 * confirmed.
1da177e4 767 */
a55370a3
N		 768 new = create_client(clname, dname);
769 if (new == NULL)
1da177e4 770 goto out;
1da177e4 771 gen_clid(new);
49ba8781 772 } else {
a186e767
BF		 773 /*
774 * RFC 3530 14.2.33 CASE 3:
775 * probable client reboot; state will be removed if
776 * confirmed.
1da177e4
LT		 777 */
778 expire_client(unconf);
a55370a3
N		 779 new = create_client(clname, dname);
780 if (new == NULL)
1da177e4 781 goto out;
1da177e4 782 gen_clid(new);
1da177e4 783 }
c175b83c
BF		 784 copy_verf(new, &clverifier);
785 new->cl_addr = sin->sin_addr.s_addr;
786 copy_cred(&new->cl_cred, &rqstp->rq_cred);
787 gen_confirm(new);
788 gen_callback(new, setclid);
789 add_to_unconfirmed(new, strhashval);
1da177e4
LT		 790 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
791 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
792 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
793 status = nfs_ok;
794out:
795 nfs4_unlock_state();
796 return status;
797}
798
799
800/*
a186e767
BF		 801 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
802 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
803 * bullets, labeled as CASE1 - CASE4 below.
1da177e4 804 */
b37ad28b 805__be32
b591480b
BF		 806nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
807 struct nfsd4_compound_state *cstate,
808 struct nfsd4_setclientid_confirm *setclientid_confirm)
1da177e4 809{
27459f09 810 struct sockaddr_in *sin = svc_addr_in(rqstp);
21ab45a4 811 struct nfs4_client *conf, *unconf;
1da177e4
LT		 812 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
813 clientid_t * clid = &setclientid_confirm->sc_clientid;
b37ad28b 814 __be32 status;
1da177e4
LT		 815
816 if (STALE_CLIENTID(clid))
817 return nfserr_stale_clientid;
818 /*
819 * XXX The Duplicate Request Cache (DRC) has been checked (??)
820 * We get here on a DRC miss.
821 */
822
823 nfs4_lock_state();
21ab45a4
N		 824
825 conf = find_confirmed_client(clid);
826 unconf = find_unconfirmed_client(clid);
827
828 status = nfserr_clid_inuse;
27459f09 829 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
21ab45a4 830 goto out;
27459f09 831 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
21ab45a4
N		 832 goto out;
833
a186e767
BF		 834 /*
835 * section 14.2.34 of RFC 3530 has a description of
836 * SETCLIENTID_CONFIRM request processing consisting
837 * of 4 bullet points, labeled as CASE1 - CASE4 below.
838 */
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
ba5a6a19
BF		 1160static int access_valid(u32 x)
1161{
1162 return (x > 0 && x < 4);
1163}
1164
1165static int deny_valid(u32 x)
1166{
1167 return (x >= 0 && x < 5);
1168}
1da177e4 1169
fd39ca9a 1170static void
1da177e4
LT		 1171set_access(unsigned int *access, unsigned long bmap) {
1172 int i;
1173
1174 *access = 0;
1175 for (i = 1; i < 4; i++) {
1176 if (test_bit(i, &bmap))
1177 *access |= i;
1178 }
1179}
1180
fd39ca9a 1181static void
1da177e4
LT		 1182set_deny(unsigned int *deny, unsigned long bmap) {
1183 int i;
1184
1185 *deny = 0;
1186 for (i = 0; i < 4; i++) {
1187 if (test_bit(i, &bmap))
1188 *deny |= i ;
1189 }
1190}
1191
1192static int
1193test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1194 unsigned int access, deny;
1195
1196 set_access(&access, stp->st_access_bmap);
1197 set_deny(&deny, stp->st_deny_bmap);
1198 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1199 return 0;
1200 return 1;
1201}
1202
1203/*
1204 * Called to check deny when READ with all zero stateid or
1205 * WRITE with all zero or all one stateid
1206 */
b37ad28b 1207static __be32
1da177e4
LT		 1208nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1209{
1210 struct inode *ino = current_fh->fh_dentry->d_inode;
1211 struct nfs4_file *fp;
1212 struct nfs4_stateid *stp;
b37ad28b 1213 __be32 ret;
1da177e4
LT		 1214
1215 dprintk("NFSD: nfs4_share_conflict\n");
1216
1217 fp = find_file(ino);
13cd2184
N		 1218 if (!fp)
1219 return nfs_ok;
b700949b 1220 ret = nfserr_locked;
1da177e4 1221 /* Search for conflicting share reservations */
13cd2184
N		 1222 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1223 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1224 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1225 goto out;
1da177e4 1226 }
13cd2184
N		 1227 ret = nfs_ok;
1228out:
1229 put_nfs4_file(fp);
1230 return ret;
1da177e4
LT		 1231}
1232
1233static inline void
1234nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1235{
1236 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
7eaa36e2 1237 put_write_access(filp->f_path.dentry->d_inode);
1da177e4
LT		 1238 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1239 }
1240}
1241
1242/*
1243 * Recall a delegation
1244 */
1245static int
1246do_recall(void *__dp)
1247{
1248 struct nfs4_delegation *dp = __dp;
1249
47f9940c 1250 dp->dl_file->fi_had_conflict = true;
1da177e4
LT		 1251 nfsd4_cb_recall(dp);
1252 return 0;
1253}
1254
1255/*
1256 * Spawn a thread to perform a recall on the delegation represented
1257 * by the lease (file_lock)
1258 *
1259 * Called from break_lease() with lock_kernel() held.
1260 * Note: we assume break_lease will only call this *once* for any given
1261 * lease.
1262 */
1263static
1264void nfsd_break_deleg_cb(struct file_lock *fl)
1265{
1266 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1267 struct task_struct *t;
1268
1269 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1270 if (!dp)
1271 return;
1272
1273 /* We're assuming the state code never drops its reference
1274 * without first removing the lease. Since we're in this lease
1275 * callback (and since the lease code is serialized by the kernel
1276 * lock) we know the server hasn't removed the lease yet, we know
1277 * it's safe to take a reference: */
1278 atomic_inc(&dp->dl_count);
cfdcad4d 1279 atomic_inc(&dp->dl_client->cl_count);
1da177e4
LT		 1280
1281 spin_lock(&recall_lock);
1282 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1283 spin_unlock(&recall_lock);
1284
1285 /* only place dl_time is set. protected by lock_kernel*/
1286 dp->dl_time = get_seconds();
1287
0272e1fd
BF		 1288 /*
1289 * We don't want the locks code to timeout the lease for us;
1290 * we'll remove it ourself if the delegation isn't returned
1291 * in time.
1292 */
1293 fl->fl_break_time = 0;
1da177e4
LT		 1294
1295 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1296 if (IS_ERR(t)) {
1297 struct nfs4_client *clp = dp->dl_client;
1298
1299 printk(KERN_INFO "NFSD: Callback thread failed for "
1300 "for client (clientid %08x/%08x)\n",
1301 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
cfdcad4d 1302 put_nfs4_client(dp->dl_client);
1da177e4
LT		 1303 nfs4_put_delegation(dp);
1304 }
1305}
1306
1307/*
1308 * The file_lock is being reapd.
1309 *
1310 * Called by locks_free_lock() with lock_kernel() held.
1311 */
1312static
1313void nfsd_release_deleg_cb(struct file_lock *fl)
1314{
1315 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1316
1317 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1318
1319 if (!(fl->fl_flags & FL_LEASE) || !dp)
1320 return;
1321 dp->dl_flock = NULL;
1322}
1323
1324/*
1325 * Set the delegation file_lock back pointer.
1326 *
a9933cea 1327 * Called from setlease() with lock_kernel() held.
1da177e4
LT		 1328 */
1329static
1330void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1331{
1332 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1333
1334 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1335 if (!dp)
1336 return;
1337 dp->dl_flock = new;
1338}
1339
1340/*
a9933cea 1341 * Called from setlease() with lock_kernel() held
1da177e4
LT		 1342 */
1343static
1344int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1345{
1346 struct nfs4_delegation *onlistd =
1347 (struct nfs4_delegation *)onlist->fl_owner;
1348 struct nfs4_delegation *tryd =
1349 (struct nfs4_delegation *)try->fl_owner;
1350
1351 if (onlist->fl_lmops != try->fl_lmops)
1352 return 0;
1353
1354 return onlistd->dl_client == tryd->dl_client;
1355}
1356
1357
1358static
1359int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1360{
1361 if (arg & F_UNLCK)
1362 return lease_modify(onlist, arg);
1363 else
1364 return -EAGAIN;
1365}
1366
fd39ca9a 1367static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1368 .fl_break = nfsd_break_deleg_cb,
1369 .fl_release_private = nfsd_release_deleg_cb,
1370 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1371 .fl_mylease = nfsd_same_client_deleg_cb,
1372 .fl_change = nfsd_change_deleg_cb,
1373};
1374
1375
b37ad28b 1376__be32
1da177e4
LT		 1377nfsd4_process_open1(struct nfsd4_open *open)
1378{
1da177e4
LT		 1379 clientid_t *clientid = &open->op_clientid;
1380 struct nfs4_client *clp = NULL;
1381 unsigned int strhashval;
1382 struct nfs4_stateowner *sop = NULL;
1383
1da177e4 1384 if (!check_name(open->op_owner))
0f442aa2 1385 return nfserr_inval;
1da177e4
LT		 1386
1387 if (STALE_CLIENTID(&open->op_clientid))
1388 return nfserr_stale_clientid;
1389
1390 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1391 sop = find_openstateowner_str(strhashval, open);
0f442aa2
BF		 1392 open->op_stateowner = sop;
1393 if (!sop) {
1394 /* Make sure the client's lease hasn't expired. */
1da177e4
LT		 1395 clp = find_confirmed_client(clientid);
1396 if (clp == NULL)
0f442aa2
BF		 1397 return nfserr_expired;
1398 goto renew;
1da177e4 1399 }
0f442aa2
BF		 1400 if (!sop->so_confirmed) {
1401 /* Replace unconfirmed owners without checking for replay. */
1402 clp = sop->so_client;
1403 release_stateowner(sop);
1404 open->op_stateowner = NULL;
1405 goto renew;
1406 }
1407 if (open->op_seqid == sop->so_seqid - 1) {
1408 if (sop->so_replay.rp_buflen)
a90b061c 1409 return nfserr_replay_me;
0f442aa2
BF		 1410 /* The original OPEN failed so spectacularly
1411 * that we don't even have replay data saved!
1412 * Therefore, we have no choice but to continue
1413 * processing this OPEN; presumably, we'll
1414 * fail again for the same reason.
1415 */
1416 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1417 goto renew;
1418 }
1419 if (open->op_seqid != sop->so_seqid)
1420 return nfserr_bad_seqid;
1da177e4 1421renew:
0f442aa2
BF		 1422 if (open->op_stateowner == NULL) {
1423 sop = alloc_init_open_stateowner(strhashval, clp, open);
1424 if (sop == NULL)
1425 return nfserr_resource;
1426 open->op_stateowner = sop;
1427 }
1428 list_del_init(&sop->so_close_lru);
1da177e4 1429 renew_client(sop->so_client);
0f442aa2 1430 return nfs_ok;
1da177e4
LT		 1431}
1432
b37ad28b 1433static inline __be32
4a6e43e6
N		 1434nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1435{
1436 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1437 return nfserr_openmode;
1438 else
1439 return nfs_ok;
1440}
1441
52f4fb43
N		 1442static struct nfs4_delegation *
1443find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1444{
1445 struct nfs4_delegation *dp;
1446
ea1da636 1447 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1448 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1449 return dp;
1450 }
1451 return NULL;
1452}
1453
b37ad28b 1454static __be32
567d9829
N		 1455nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1456 struct nfs4_delegation **dp)
1457{
1458 int flags;
b37ad28b 1459 __be32 status = nfserr_bad_stateid;
567d9829
N		 1460
1461 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1462 if (*dp == NULL)
c44c5eeb 1463 goto out;
567d9829
N		 1464 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1465 RD_STATE : WR_STATE;
1466 status = nfs4_check_delegmode(*dp, flags);
1467 if (status)
1468 *dp = NULL;
c44c5eeb
N		 1469out:
1470 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1471 return nfs_ok;
1472 if (status)
1473 return status;
1474 open->op_stateowner->so_confirmed = 1;
1475 return nfs_ok;
567d9829
N		 1476}
1477
b37ad28b 1478static __be32
1da177e4
LT		 1479nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1480{
1481 struct nfs4_stateid *local;
b37ad28b 1482 __be32 status = nfserr_share_denied;
1da177e4
LT		 1483 struct nfs4_stateowner *sop = open->op_stateowner;
1484
8beefa24 1485 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1486 /* ignore lock owners */
1487 if (local->st_stateowner->so_is_open_owner == 0)
1488 continue;
1489 /* remember if we have seen this open owner */
1490 if (local->st_stateowner == sop)
1491 *stpp = local;
1492 /* check for conflicting share reservations */
1493 if (!test_share(local, open))
1494 goto out;
1495 }
1496 status = 0;
1497out:
1498 return status;
1499}
1500
5ac049ac
N		 1501static inline struct nfs4_stateid *
1502nfs4_alloc_stateid(void)
1503{
1504 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1505}
1506
b37ad28b 1507static __be32
1da177e4 1508nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1509 struct nfs4_delegation *dp,
1da177e4
LT		 1510 struct svc_fh *cur_fh, int flags)
1511{
1512 struct nfs4_stateid *stp;
1da177e4 1513
5ac049ac 1514 stp = nfs4_alloc_stateid();
1da177e4
LT		 1515 if (stp == NULL)
1516 return nfserr_resource;
1517
567d9829
N		 1518 if (dp) {
1519 get_file(dp->dl_vfs_file);
1520 stp->st_vfs_file = dp->dl_vfs_file;
1521 } else {
b37ad28b 1522 __be32 status;
567d9829
N		 1523 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1524 &stp->st_vfs_file);
1525 if (status) {
1526 if (status == nfserr_dropit)
1527 status = nfserr_jukebox;
5ac049ac 1528 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1529 return status;
1530 }
1da177e4 1531 }
1da177e4
LT		 1532 *stpp = stp;
1533 return 0;
1534}
1535
b37ad28b 1536static inline __be32
1da177e4
LT		 1537nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1538 struct nfsd4_open *open)
1539{
1540 struct iattr iattr = {
1541 .ia_valid = ATTR_SIZE,
1542 .ia_size = 0,
1543 };
1544 if (!open->op_truncate)
1545 return 0;
1546 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
9246585a 1547 return nfserr_inval;
1da177e4
LT		 1548 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1549}
1550
b37ad28b 1551static __be32
1da177e4
LT		 1552nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1553{
1554 struct file *filp = stp->st_vfs_file;
7eaa36e2 1555 struct inode *inode = filp->f_path.dentry->d_inode;
6c26d08f 1556 unsigned int share_access, new_writer;
b37ad28b 1557 __be32 status;
1da177e4
LT		 1558
1559 set_access(&share_access, stp->st_access_bmap);
6c26d08f
BF		 1560 new_writer = (~share_access) & open->op_share_access
1561 & NFS4_SHARE_ACCESS_WRITE;
1da177e4 1562
6c26d08f 1563 if (new_writer) {
b37ad28b
AV		 1564 int err = get_write_access(inode);
1565 if (err)
1566 return nfserrno(err);
6c26d08f 1567 }
1da177e4
LT		 1568 status = nfsd4_truncate(rqstp, cur_fh, open);
1569 if (status) {
6c26d08f
BF		 1570 if (new_writer)
1571 put_write_access(inode);
1da177e4
LT		 1572 return status;
1573 }
1574 /* remember the open */
6c26d08f 1575 filp->f_mode |= open->op_share_access;
1da177e4
LT		 1576 set_bit(open->op_share_access, &stp->st_access_bmap);
1577 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1578
1579 return nfs_ok;
1580}
1581
1582
1da177e4 1583static void
37515177 1584nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1585{
37515177
N		 1586 open->op_stateowner->so_confirmed = 1;
1587 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1588}
1589
1590/*
1591 * Attempt to hand out a delegation.
1592 */
1593static void
1594nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1595{
1596 struct nfs4_delegation *dp;
1597 struct nfs4_stateowner *sop = stp->st_stateowner;
1598 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1599 struct file_lock fl, *flp = &fl;
1600 int status, flag = 0;
1601
1602 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1603 open->op_recall = 0;
1604 switch (open->op_claim_type) {
1605 case NFS4_OPEN_CLAIM_PREVIOUS:
1606 if (!atomic_read(&cb->cb_set))
1607 open->op_recall = 1;
1608 flag = open->op_delegate_type;
1609 if (flag == NFS4_OPEN_DELEGATE_NONE)
1610 goto out;
1611 break;
1612 case NFS4_OPEN_CLAIM_NULL:
1613 /* Let's not give out any delegations till everyone's
1614 * had the chance to reclaim theirs.... */
1615 if (nfs4_in_grace())
1616 goto out;
1617 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1618 goto out;
1619 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1620 flag = NFS4_OPEN_DELEGATE_WRITE;
1621 else
1622 flag = NFS4_OPEN_DELEGATE_READ;
1623 break;
1624 default:
1625 goto out;
1626 }
1da177e4
LT		 1627
1628 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1629 if (dp == NULL) {
1630 flag = NFS4_OPEN_DELEGATE_NONE;
1631 goto out;
1632 }
1633 locks_init_lock(&fl);
1634 fl.fl_lmops = &nfsd_lease_mng_ops;
1635 fl.fl_flags = FL_LEASE;
1636 fl.fl_end = OFFSET_MAX;
1637 fl.fl_owner = (fl_owner_t)dp;
1638 fl.fl_file = stp->st_vfs_file;
1639 fl.fl_pid = current->tgid;
1640
a9933cea 1641 /* vfs_setlease checks to see if delegation should be handed out.
1da177e4
LT		 1642 * the lock_manager callbacks fl_mylease and fl_change are used
1643 */
a9933cea 1644 if ((status = vfs_setlease(stp->st_vfs_file,
1da177e4
LT		 1645 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1646 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1647 unhash_delegation(dp);
1da177e4
LT		 1648 flag = NFS4_OPEN_DELEGATE_NONE;
1649 goto out;
1650 }
1651
1652 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1653
1654 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1655 dp->dl_stateid.si_boot,
1656 dp->dl_stateid.si_stateownerid,
1657 dp->dl_stateid.si_fileid,
1658 dp->dl_stateid.si_generation);
1659out:
7b190fec
N		 1660 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1661 && flag == NFS4_OPEN_DELEGATE_NONE
1662 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2fdada03 1663 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1664 open->op_delegate_type = flag;
1665}
1666
1667/*
1668 * called with nfs4_lock_state() held.
1669 */
b37ad28b 1670__be32
1da177e4
LT		 1671nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1672{
1673 struct nfs4_file *fp = NULL;
1674 struct inode *ino = current_fh->fh_dentry->d_inode;
1675 struct nfs4_stateid *stp = NULL;
567d9829 1676 struct nfs4_delegation *dp = NULL;
b37ad28b 1677 __be32 status;
1da177e4
LT		 1678
1679 status = nfserr_inval;
ba5a6a19
BF		 1680 if (!access_valid(open->op_share_access)
1681 || !deny_valid(open->op_share_deny))
1da177e4
LT		 1682 goto out;
1683 /*
1684 * Lookup file; if found, lookup stateid and check open request,
1685 * and check for delegations in the process of being recalled.
1686 * If not found, create the nfs4_file struct
1687 */
1688 fp = find_file(ino);
1689 if (fp) {
1690 if ((status = nfs4_check_open(fp, open, &stp)))
1691 goto out;
c44c5eeb
N		 1692 status = nfs4_check_deleg(fp, open, &dp);
1693 if (status)
1694 goto out;
1da177e4 1695 } else {
c44c5eeb
N		 1696 status = nfserr_bad_stateid;
1697 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1698 goto out;
1da177e4
LT		 1699 status = nfserr_resource;
1700 fp = alloc_init_file(ino);
1701 if (fp == NULL)
1702 goto out;
1703 }
1704
1705 /*
1706 * OPEN the file, or upgrade an existing OPEN.
1707 * If truncate fails, the OPEN fails.
1708 */
1709 if (stp) {
1710 /* Stateid was found, this is an OPEN upgrade */
1711 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1712 if (status)
1713 goto out;
444c2c07 1714 update_stateid(&stp->st_stateid);
1da177e4
LT		 1715 } else {
1716 /* Stateid was not found, this is a new OPEN */
1717 int flags = 0;
9ecb6a08
BF		 1718 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1719 flags |= MAY_READ;
1da177e4 1720 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
9ecb6a08 1721 flags |= MAY_WRITE;
567d9829
N		 1722 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1723 if (status)
1da177e4
LT		 1724 goto out;
1725 init_stateid(stp, fp, open);
1726 status = nfsd4_truncate(rqstp, current_fh, open);
1727 if (status) {
1728 release_stateid(stp, OPEN_STATE);
1729 goto out;
1730 }
1731 }
1732 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1733
1734 /*
1735 * Attempt to hand out a delegation. No error return, because the
1736 * OPEN succeeds even if we fail.
1737 */
1738 nfs4_open_delegation(current_fh, open, stp);
1739
1740 status = nfs_ok;
1741
1742 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1743 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1744 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1745out:
13cd2184
N		 1746 if (fp)
1747 put_nfs4_file(fp);
37515177
N		 1748 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1749 nfs4_set_claim_prev(open);
1da177e4
LT		 1750 /*
1751 * To finish the open response, we just need to set the rflags.
1752 */
1753 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1754 if (!open->op_stateowner->so_confirmed)
1755 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1756
1757 return status;
1758}
1759
58da282b 1760static struct workqueue_struct *laundry_wq;
c4028958
DH		 1761static void laundromat_main(struct work_struct *);
1762static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1da177e4 1763
b37ad28b 1764__be32
b591480b
BF		 1765nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1766 clientid_t *clid)
1da177e4
LT		 1767{
1768 struct nfs4_client *clp;
b37ad28b 1769 __be32 status;
1da177e4
LT		 1770
1771 nfs4_lock_state();
1772 dprintk("process_renew(%08x/%08x): starting\n",
1773 clid->cl_boot, clid->cl_id);
1774 status = nfserr_stale_clientid;
1775 if (STALE_CLIENTID(clid))
1776 goto out;
1777 clp = find_confirmed_client(clid);
1778 status = nfserr_expired;
1779 if (clp == NULL) {
1780 /* We assume the client took too long to RENEW. */
1781 dprintk("nfsd4_renew: clientid not found!\n");
1782 goto out;
1783 }
1784 renew_client(clp);
1785 status = nfserr_cb_path_down;
ea1da636 1786 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1787 && !atomic_read(&clp->cl_callback.cb_set))
1788 goto out;
1789 status = nfs_ok;
1790out:
1791 nfs4_unlock_state();
1792 return status;
1793}
1794
a76b4319
N		 1795static void
1796end_grace(void)
1797{
1798 dprintk("NFSD: end of grace period\n");
c7b9a459 1799 nfsd4_recdir_purge_old();
a76b4319
N		 1800 in_grace = 0;
1801}
1802
fd39ca9a 1803static time_t
1da177e4
LT		 1804nfs4_laundromat(void)
1805{
1806 struct nfs4_client *clp;
1807 struct nfs4_stateowner *sop;
1808 struct nfs4_delegation *dp;
1809 struct list_head *pos, *next, reaplist;
1810 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1811 time_t t, clientid_val = NFSD_LEASE_TIME;
1812 time_t u, test_val = NFSD_LEASE_TIME;
1813
1814 nfs4_lock_state();
1815
1816 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1817 if (in_grace)
1818 end_grace();
1da177e4
LT		 1819 list_for_each_safe(pos, next, &client_lru) {
1820 clp = list_entry(pos, struct nfs4_client, cl_lru);
1821 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1822 t = clp->cl_time - cutoff;
1823 if (clientid_val > t)
1824 clientid_val = t;
1825 break;
1826 }
1827 dprintk("NFSD: purging unused client (clientid %08x)\n",
1828 clp->cl_clientid.cl_id);
c7b9a459 1829 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1830 expire_client(clp);
1831 }
1832 INIT_LIST_HEAD(&reaplist);
1833 spin_lock(&recall_lock);
1834 list_for_each_safe(pos, next, &del_recall_lru) {
1835 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1836 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1837 u = dp->dl_time - cutoff;
1838 if (test_val > u)
1839 test_val = u;
1840 break;
1841 }
1842 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1843 dp, dp->dl_flock);
1844 list_move(&dp->dl_recall_lru, &reaplist);
1845 }
1846 spin_unlock(&recall_lock);
1847 list_for_each_safe(pos, next, &reaplist) {
1848 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1849 list_del_init(&dp->dl_recall_lru);
1850 unhash_delegation(dp);
1851 }
1852 test_val = NFSD_LEASE_TIME;
1853 list_for_each_safe(pos, next, &close_lru) {
1854 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1855 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1856 u = sop->so_time - cutoff;
1857 if (test_val > u)
1858 test_val = u;
1859 break;
1860 }
1861 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1862 sop->so_id);
358dd55a 1863 release_stateowner(sop);
1da177e4
LT		 1864 }
1865 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1866 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1867 nfs4_unlock_state();
1868 return clientid_val;
1869}
1870
1871void
c4028958 1872laundromat_main(struct work_struct *not_used)
1da177e4
LT		 1873{
1874 time_t t;
1875
1876 t = nfs4_laundromat();
1877 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1878 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1879}
1880
fd39ca9a 1881static struct nfs4_stateowner *
f8816512
N		 1882search_close_lru(u32 st_id, int flags)
1883{
1da177e4
LT		 1884 struct nfs4_stateowner *local = NULL;
1885
1da177e4
LT		 1886 if (flags & CLOSE_STATE) {
1887 list_for_each_entry(local, &close_lru, so_close_lru) {
1888 if (local->so_id == st_id)
1889 return local;
1890 }
1891 }
1892 return NULL;
1893}
1894
1895static inline int
1896nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1897{
7eaa36e2 1898 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1da177e4
LT		 1899}
1900
1901static int
1902STALE_STATEID(stateid_t *stateid)
1903{
1904 if (stateid->si_boot == boot_time)
1905 return 0;
849823c5 1906 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 1907 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1908 stateid->si_generation);
1909 return 1;
1910}
1911
1912static inline int
1913access_permit_read(unsigned long access_bmap)
1914{
1915 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1916 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1917 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1918}
1919
1920static inline int
1921access_permit_write(unsigned long access_bmap)
1922{
1923 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1924 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1925}
1926
1927static
b37ad28b 1928__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1da177e4 1929{
b37ad28b 1930 __be32 status = nfserr_openmode;
1da177e4
LT		 1931
1932 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1933 goto out;
1934 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1935 goto out;
1936 status = nfs_ok;
1937out:
1938 return status;
1939}
1940
b37ad28b 1941static inline __be32
1da177e4
LT		 1942check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1943{
1944 /* Trying to call delegreturn with a special stateid? Yuch: */
1945 if (!(flags & (RD_STATE | WR_STATE)))
1946 return nfserr_bad_stateid;
1947 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1948 return nfs_ok;
1949 else if (nfs4_in_grace()) {
1950 /* Answer in remaining cases depends on existance of
1951 * conflicting state; so we must wait out the grace period. */
1952 return nfserr_grace;
1953 } else if (flags & WR_STATE)
1954 return nfs4_share_conflict(current_fh,
1955 NFS4_SHARE_DENY_WRITE);
1956 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1957 return nfs4_share_conflict(current_fh,
1958 NFS4_SHARE_DENY_READ);
1959}
1960
1961/*
1962 * Allow READ/WRITE during grace period on recovered state only for files
1963 * that are not able to provide mandatory locking.
1964 */
1965static inline int
1966io_during_grace_disallowed(struct inode *inode, int flags)
1967{
1968 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
a16877ca 1969 && mandatory_lock(inode);
1da177e4
LT		 1970}
1971
1972/*
1973* Checks for stateid operations
1974*/
b37ad28b 1975__be32
1da177e4
LT		 1976nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1977{
1978 struct nfs4_stateid *stp = NULL;
1979 struct nfs4_delegation *dp = NULL;
1980 stateid_t *stidp;
1981 struct inode *ino = current_fh->fh_dentry->d_inode;
b37ad28b 1982 __be32 status;
1da177e4
LT		 1983
1984 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1985 stateid->si_boot, stateid->si_stateownerid,
1986 stateid->si_fileid, stateid->si_generation);
1987 if (filpp)
1988 *filpp = NULL;
1989
1990 if (io_during_grace_disallowed(ino, flags))
1991 return nfserr_grace;
1992
1993 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1994 return check_special_stateids(current_fh, stateid, flags);
1995
1996 /* STALE STATEID */
1997 status = nfserr_stale_stateid;
1998 if (STALE_STATEID(stateid))
1999 goto out;
2000
2001 /* BAD STATEID */
2002 status = nfserr_bad_stateid;
2003 if (!stateid->si_fileid) { /* delegation stateid */
2004 if(!(dp = find_delegation_stateid(ino, stateid))) {
2005 dprintk("NFSD: delegation stateid not found\n");
1da177e4
LT		 2006 goto out;
2007 }
2008 stidp = &dp->dl_stateid;
2009 } else { /* open or lock stateid */
2010 if (!(stp = find_stateid(stateid, flags))) {
2011 dprintk("NFSD: open or lock stateid not found\n");
1da177e4
LT		 2012 goto out;
2013 }
2014 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2015 goto out;
2016 if (!stp->st_stateowner->so_confirmed)
2017 goto out;
2018 stidp = &stp->st_stateid;
2019 }
2020 if (stateid->si_generation > stidp->si_generation)
2021 goto out;
2022
2023 /* OLD STATEID */
2024 status = nfserr_old_stateid;
2025 if (stateid->si_generation < stidp->si_generation)
2026 goto out;
2027 if (stp) {
2028 if ((status = nfs4_check_openmode(stp,flags)))
2029 goto out;
2030 renew_client(stp->st_stateowner->so_client);
2031 if (filpp)
2032 *filpp = stp->st_vfs_file;
2033 } else if (dp) {
2034 if ((status = nfs4_check_delegmode(dp, flags)))
2035 goto out;
2036 renew_client(dp->dl_client);
2037 if (flags & DELEG_RET)
2038 unhash_delegation(dp);
2039 if (filpp)
2040 *filpp = dp->dl_vfs_file;
2041 }
2042 status = nfs_ok;
2043out:
2044 return status;
2045}
2046
4c4cd222
N		 2047static inline int
2048setlkflg (int type)
2049{
2050 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2051 RD_STATE : WR_STATE;
2052}
1da177e4
LT		 2053
2054/*
2055 * Checks for sequence id mutating operations.
2056 */
b37ad28b 2057static __be32
4c4cd222 2058nfs4_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 2059{
1da177e4
LT		 2060 struct nfs4_stateid *stp;
2061 struct nfs4_stateowner *sop;
2062
2063 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2064 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2065 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2066 stateid->si_generation);
3a4f98bb 2067
1da177e4
LT		 2068 *stpp = NULL;
2069 *sopp = NULL;
2070
1da177e4 2071 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2fdada03 2072 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2073 return nfserr_bad_stateid;
1da177e4
LT		 2074 }
2075
1da177e4 2076 if (STALE_STATEID(stateid))
3a4f98bb 2077 return nfserr_stale_stateid;
1da177e4
LT		 2078 /*
2079 * We return BAD_STATEID if filehandle doesn't match stateid,
2080 * the confirmed flag is incorrecly set, or the generation
2081 * number is incorrect.
1da177e4 2082 */
f8816512
N		 2083 stp = find_stateid(stateid, flags);
2084 if (stp == NULL) {
2085 /*
2086 * Also, we should make sure this isn't just the result of
2087 * a replayed close:
2088 */
2089 sop = search_close_lru(stateid->si_stateownerid, flags);
2090 if (sop == NULL)
2091 return nfserr_bad_stateid;
2092 *sopp = sop;
2093 goto check_replay;
2094 }
1da177e4 2095
4c4cd222 2096 if (lock) {
1da177e4 2097 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2098 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2099 struct nfs4_client *clp = sop->so_client;
4c4cd222 2100 int lkflg = 0;
b37ad28b 2101 __be32 status;
4c4cd222
N		 2102
2103 lkflg = setlkflg(lock->lk_type);
2104
2105 if (lock->lk_is_new) {
599e0a22
BF		 2106 if (!sop->so_is_open_owner)
2107 return nfserr_bad_stateid;
2108 if (!same_clid(&clp->cl_clientid, lockclid))
4c4cd222 2109 return nfserr_bad_stateid;
599e0a22
BF		 2110 /* stp is the open stateid */
2111 status = nfs4_check_openmode(stp, lkflg);
2112 if (status)
2113 return status;
2114 } else {
2115 /* stp is the lock stateid */
2116 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2117 if (status)
2118 return status;
4c4cd222 2119 }
1da177e4
LT		 2120 }
2121
2122 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2fdada03 2123 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2124 return nfserr_bad_stateid;
1da177e4
LT		 2125 }
2126
2127 *stpp = stp;
2128 *sopp = sop = stp->st_stateowner;
2129
2130 /*
2131 * We now validate the seqid and stateid generation numbers.
2132 * For the moment, we ignore the possibility of
2133 * generation number wraparound.
2134 */
bd9aac52 2135 if (seqid != sop->so_seqid)
1da177e4
LT		 2136 goto check_replay;
2137
3a4f98bb 2138 if (sop->so_confirmed && flags & CONFIRM) {
2fdada03 2139 dprintk("NFSD: preprocess_seqid_op: expected"
3a4f98bb
N		 2140 " unconfirmed stateowner!\n");
2141 return nfserr_bad_stateid;
1da177e4 2142 }
3a4f98bb 2143 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2fdada03 2144 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3a4f98bb
N		 2145 " confirmed yet!\n");
2146 return nfserr_bad_stateid;
1da177e4
LT		 2147 }
2148 if (stateid->si_generation > stp->st_stateid.si_generation) {
2fdada03 2149 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2150 return nfserr_bad_stateid;
1da177e4
LT		 2151 }
2152
1da177e4 2153 if (stateid->si_generation < stp->st_stateid.si_generation) {
2fdada03 2154 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2155 return nfserr_old_stateid;
1da177e4 2156 }
52fd004e 2157 renew_client(sop->so_client);
3a4f98bb 2158 return nfs_ok;
1da177e4 2159
1da177e4 2160check_replay:
bd9aac52 2161 if (seqid == sop->so_seqid - 1) {
849823c5 2162 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2163 /* indicate replay to calling function */
a90b061c 2164 return nfserr_replay_me;
1da177e4 2165 }
2fdada03 2166 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3a4f98bb
N		 2167 sop->so_seqid, seqid);
2168 *sopp = NULL;
2169 return nfserr_bad_seqid;
1da177e4
LT		 2170}
2171
b37ad28b 2172__be32
ca364317 2173nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2174 struct nfsd4_open_confirm *oc)
1da177e4 2175{
b37ad28b 2176 __be32 status;
1da177e4
LT		 2177 struct nfs4_stateowner *sop;
2178 struct nfs4_stateid *stp;
2179
2180 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
ca364317
BF		 2181 (int)cstate->current_fh.fh_dentry->d_name.len,
2182 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2183
ca364317 2184 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
a8cddc5d
BF		 2185 if (status)
2186 return status;
1da177e4
LT		 2187
2188 nfs4_lock_state();
2189
ca364317
BF		 2190 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2191 oc->oc_seqid, &oc->oc_req_stateid,
1da177e4
LT		 2192 CHECK_FH | CONFIRM | OPEN_STATE,
2193 &oc->oc_stateowner, &stp, NULL)))
2194 goto out;
2195
2196 sop = oc->oc_stateowner;
2197 sop->so_confirmed = 1;
2198 update_stateid(&stp->st_stateid);
2199 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2200 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2201 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2202 stp->st_stateid.si_boot,
2203 stp->st_stateid.si_stateownerid,
2204 stp->st_stateid.si_fileid,
2205 stp->st_stateid.si_generation);
c7b9a459
N		 2206
2207 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2208out:
f2327d9a 2209 if (oc->oc_stateowner) {
1da177e4 2210 nfs4_get_stateowner(oc->oc_stateowner);
a4f1706a 2211 cstate->replay_owner = oc->oc_stateowner;
f2327d9a 2212 }
1da177e4
LT		 2213 nfs4_unlock_state();
2214 return status;
2215}
2216
2217
2218/*
2219 * unset all bits in union bitmap (bmap) that
2220 * do not exist in share (from successful OPEN_DOWNGRADE)
2221 */
2222static void
2223reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2224{
2225 int i;
2226 for (i = 1; i < 4; i++) {
2227 if ((i & access) != i)
2228 __clear_bit(i, bmap);
2229 }
2230}
2231
2232static void
2233reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2234{
2235 int i;
2236 for (i = 0; i < 4; i++) {
2237 if ((i & deny) != i)
2238 __clear_bit(i, bmap);
2239 }
2240}
2241
b37ad28b 2242__be32
ca364317
BF		 2243nfsd4_open_downgrade(struct svc_rqst *rqstp,
2244 struct nfsd4_compound_state *cstate,
a4f1706a 2245 struct nfsd4_open_downgrade *od)
1da177e4 2246{
b37ad28b 2247 __be32 status;
1da177e4
LT		 2248 struct nfs4_stateid *stp;
2249 unsigned int share_access;
2250
2251 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
ca364317
BF		 2252 (int)cstate->current_fh.fh_dentry->d_name.len,
2253 cstate->current_fh.fh_dentry->d_name.name);
1da177e4 2254
ba5a6a19
BF		 2255 if (!access_valid(od->od_share_access)
2256 || !deny_valid(od->od_share_deny))
1da177e4
LT		 2257 return nfserr_inval;
2258
2259 nfs4_lock_state();
ca364317
BF		 2260 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2261 od->od_seqid,
1da177e4
LT		 2262 &od->od_stateid,
2263 CHECK_FH | OPEN_STATE,
2264 &od->od_stateowner, &stp, NULL)))
2265 goto out;
2266
2267 status = nfserr_inval;
2268 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2269 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2270 stp->st_access_bmap, od->od_share_access);
2271 goto out;
2272 }
2273 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2274 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2275 stp->st_deny_bmap, od->od_share_deny);
2276 goto out;
2277 }
2278 set_access(&share_access, stp->st_access_bmap);
2279 nfs4_file_downgrade(stp->st_vfs_file,
2280 share_access & ~od->od_share_access);
2281
2282 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2283 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2284
2285 update_stateid(&stp->st_stateid);
2286 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2287 status = nfs_ok;
2288out:
f2327d9a 2289 if (od->od_stateowner) {
1da177e4 2290 nfs4_get_stateowner(od->od_stateowner);
a4f1706a 2291 cstate->replay_owner = od->od_stateowner;
f2327d9a 2292 }
1da177e4
LT		 2293 nfs4_unlock_state();
2294 return status;
2295}
2296
2297/*
2298 * nfs4_unlock_state() called after encode
2299 */
b37ad28b 2300__be32
ca364317 2301nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2302 struct nfsd4_close *close)
1da177e4 2303{
b37ad28b 2304 __be32 status;
1da177e4
LT		 2305 struct nfs4_stateid *stp;
2306
2307 dprintk("NFSD: nfsd4_close on file %.*s\n",
ca364317
BF		 2308 (int)cstate->current_fh.fh_dentry->d_name.len,
2309 cstate->current_fh.fh_dentry->d_name.name);
1da177e4
LT		 2310
2311 nfs4_lock_state();
2312 /* check close_lru for replay */
ca364317
BF		 2313 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2314 close->cl_seqid,
1da177e4
LT		 2315 &close->cl_stateid,
2316 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2317 &close->cl_stateowner, &stp, NULL)))
2318 goto out;
1da177e4
LT		 2319 status = nfs_ok;
2320 update_stateid(&stp->st_stateid);
2321 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2322
04ef5954
BF		 2323 /* release_stateid() calls nfsd_close() if needed */
2324 release_stateid(stp, OPEN_STATE);
2325
2326 /* place unused nfs4_stateowners on so_close_lru list to be
2327 * released by the laundromat service after the lease period
2328 * to enable us to handle CLOSE replay
2329 */
2330 if (list_empty(&close->cl_stateowner->so_stateids))
2331 move_to_close_lru(close->cl_stateowner);
1da177e4 2332out:
f2327d9a 2333 if (close->cl_stateowner) {
1da177e4 2334 nfs4_get_stateowner(close->cl_stateowner);
a4f1706a 2335 cstate->replay_owner = close->cl_stateowner;
f2327d9a 2336 }
1da177e4
LT		 2337 nfs4_unlock_state();
2338 return status;
2339}
2340
b37ad28b 2341__be32
ca364317
BF		 2342nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2343 struct nfsd4_delegreturn *dr)
1da177e4 2344{
b37ad28b 2345 __be32 status;
1da177e4 2346
ca364317 2347 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
1da177e4
LT		 2348 goto out;
2349
2350 nfs4_lock_state();
ca364317
BF		 2351 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2352 &dr->dr_stateid, DELEG_RET, NULL);
1da177e4
LT		 2353 nfs4_unlock_state();
2354out:
2355 return status;
2356}
2357
2358
2359/*
2360 * Lock owner state (byte-range locks)
2361 */
2362#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2363#define LOCK_HASH_BITS 8
2364#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2365#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2366
2367#define lockownerid_hashval(id) \
2368 ((id) & LOCK_HASH_MASK)
2369
2370static inline unsigned int
2371lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2372 struct xdr_netobj *ownername)
2373{
2374 return (file_hashval(inode) + cl_id
2375 + opaque_hashval(ownername->data, ownername->len))
2376 & LOCK_HASH_MASK;
2377}
2378
2379static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2380static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2381static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2382
fd39ca9a 2383static struct nfs4_stateid *
1da177e4
LT		 2384find_stateid(stateid_t *stid, int flags)
2385{
2386 struct nfs4_stateid *local = NULL;
2387 u32 st_id = stid->si_stateownerid;
2388 u32 f_id = stid->si_fileid;
2389 unsigned int hashval;
2390
2391 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2392 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2393 hashval = stateid_hashval(st_id, f_id);
2394 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2395 if ((local->st_stateid.si_stateownerid == st_id) &&
2396 (local->st_stateid.si_fileid == f_id))
2397 return local;
2398 }
2399 }
2400 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2401 hashval = stateid_hashval(st_id, f_id);
2402 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2403 if ((local->st_stateid.si_stateownerid == st_id) &&
2404 (local->st_stateid.si_fileid == f_id))
2405 return local;
2406 }
849823c5 2407 }
1da177e4
LT		 2408 return NULL;
2409}
2410
2411static struct nfs4_delegation *
2412find_delegation_stateid(struct inode *ino, stateid_t *stid)
2413{
13cd2184
N		 2414 struct nfs4_file *fp;
2415 struct nfs4_delegation *dl;
1da177e4
LT		 2416
2417 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2418 stid->si_boot, stid->si_stateownerid,
2419 stid->si_fileid, stid->si_generation);
2420
1da177e4 2421 fp = find_file(ino);
13cd2184
N		 2422 if (!fp)
2423 return NULL;
2424 dl = find_delegation_file(fp, stid);
2425 put_nfs4_file(fp);
2426 return dl;
1da177e4
LT		 2427}
2428
2429/*
2430 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2431 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2432 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2433 * locking, this prevents us from being completely protocol-compliant. The
2434 * real solution to this problem is to start using unsigned file offsets in
2435 * the VFS, but this is a very deep change!
2436 */
2437static inline void
2438nfs4_transform_lock_offset(struct file_lock *lock)
2439{
2440 if (lock->fl_start < 0)
2441 lock->fl_start = OFFSET_MAX;
2442 if (lock->fl_end < 0)
2443 lock->fl_end = OFFSET_MAX;
2444}
2445
d5b9026a
N		 2446/* Hack!: For now, we're defining this just so we can use a pointer to it
2447 * as a unique cookie to identify our (NFSv4's) posix locks. */
e465a77f 2448static struct lock_manager_operations nfsd_posix_mng_ops = {
d5b9026a 2449};
1da177e4
LT		 2450
2451static inline void
2452nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2453{
d5b9026a
N		 2454 struct nfs4_stateowner *sop;
2455 unsigned int hval;
1da177e4 2456
d5b9026a
N		 2457 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2458 sop = (struct nfs4_stateowner *) fl->fl_owner;
2459 hval = lockownerid_hashval(sop->so_id);
1da177e4
LT		 2460 kref_get(&sop->so_ref);
2461 deny->ld_sop = sop;
2462 deny->ld_clientid = sop->so_client->cl_clientid;
d5b9026a
N		 2463 } else {
2464 deny->ld_sop = NULL;
2465 deny->ld_clientid.cl_boot = 0;
2466 deny->ld_clientid.cl_id = 0;
1da177e4
LT		 2467 }
2468 deny->ld_start = fl->fl_start;
2469 deny->ld_length = ~(u64)0;
2470 if (fl->fl_end != ~(u64)0)
2471 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2472 deny->ld_type = NFS4_READ_LT;
2473 if (fl->fl_type != F_RDLCK)
2474 deny->ld_type = NFS4_WRITE_LT;
2475}
2476
1da177e4
LT		 2477static struct nfs4_stateowner *
2478find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2479 struct xdr_netobj *owner)
2480{
2481 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2482 struct nfs4_stateowner *op;
2483
2484 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
599e0a22 2485 if (same_owner_str(op, owner, clid))
1da177e4
LT		 2486 return op;
2487 }
2488 return NULL;
2489}
2490
2491/*
2492 * Alloc a lock owner structure.
2493 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2494 * occured.
2495 *
2496 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2497 */
2498
2499static struct nfs4_stateowner *
2500alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2501 struct nfs4_stateowner *sop;
2502 struct nfs4_replay *rp;
2503 unsigned int idhashval;
2504
2505 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2506 return NULL;
2507 idhashval = lockownerid_hashval(current_ownerid);
2508 INIT_LIST_HEAD(&sop->so_idhash);
2509 INIT_LIST_HEAD(&sop->so_strhash);
2510 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2511 INIT_LIST_HEAD(&sop->so_stateids);
2512 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2513 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2514 sop->so_time = 0;
2515 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2516 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2517 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2518 sop->so_is_open_owner = 0;
2519 sop->so_id = current_ownerid++;
2520 sop->so_client = clp;
b59e3c0e
NB		 2521 /* It is the openowner seqid that will be incremented in encode in the
2522 * case of new lockowners; so increment the lock seqid manually: */
2523 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2524 sop->so_confirmed = 1;
2525 rp = &sop->so_replay;
de1ae286 2526 rp->rp_status = nfserr_serverfault;
1da177e4
LT		 2527 rp->rp_buflen = 0;
2528 rp->rp_buf = rp->rp_ibuf;
2529 return sop;
2530}
2531
fd39ca9a 2532static struct nfs4_stateid *
1da177e4
LT		 2533alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2534{
2535 struct nfs4_stateid *stp;
2536 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2537
5ac049ac
N		 2538 stp = nfs4_alloc_stateid();
2539 if (stp == NULL)
1da177e4
LT		 2540 goto out;
2541 INIT_LIST_HEAD(&stp->st_hash);
2542 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2543 INIT_LIST_HEAD(&stp->st_perstateowner);
2544 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2545 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2546 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2547 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2548 stp->st_stateowner = sop;
13cd2184 2549 get_nfs4_file(fp);
1da177e4
LT		 2550 stp->st_file = fp;
2551 stp->st_stateid.si_boot = boot_time;
2552 stp->st_stateid.si_stateownerid = sop->so_id;
2553 stp->st_stateid.si_fileid = fp->fi_id;
2554 stp->st_stateid.si_generation = 0;
2555 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2556 stp->st_access_bmap = open_stp->st_access_bmap;
2557 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2558 stp->st_openstp = open_stp;
1da177e4
LT		 2559
2560out:
2561 return stp;
2562}
2563
fd39ca9a 2564static int
1da177e4
LT		 2565check_lock_length(u64 offset, u64 length)
2566{
2567 return ((length == 0) || ((length != ~(u64)0) &&
2568 LOFF_OVERFLOW(offset, length)));
2569}
2570
2571/*
2572 * LOCK operation
2573 */
b37ad28b 2574__be32
ca364317 2575nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2576 struct nfsd4_lock *lock)
1da177e4 2577{
3e9e3dbe 2578 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2579 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2580 struct nfs4_stateid *lock_stp;
2581 struct file *filp;
2582 struct file_lock file_lock;
8dc7c311 2583 struct file_lock conflock;
b37ad28b 2584 __be32 status = 0;
1da177e4 2585 unsigned int strhashval;
150b3934 2586 unsigned int cmd;
b8dd7b9a 2587 int err;
1da177e4
LT		 2588
2589 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2590 (long long) lock->lk_offset,
2591 (long long) lock->lk_length);
2592
1da177e4
LT		 2593 if (check_lock_length(lock->lk_offset, lock->lk_length))
2594 return nfserr_inval;
2595
ca364317
BF		 2596 if ((status = fh_verify(rqstp, &cstate->current_fh,
2597 S_IFREG, MAY_LOCK))) {
a6f6ef2f
AA		 2598 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2599 return status;
2600 }
2601
1da177e4
LT		 2602 nfs4_lock_state();
2603
2604 if (lock->lk_is_new) {
893f8770
N		 2605 /*
2606 * Client indicates that this is a new lockowner.
2607 * Use open owner and open stateid to create lock owner and
2608 * lock stateid.
2609 */
1da177e4
LT		 2610 struct nfs4_stateid *open_stp = NULL;
2611 struct nfs4_file *fp;
2612
2613 status = nfserr_stale_clientid;
849823c5 2614 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2615 goto out;
1da177e4 2616
1da177e4 2617 /* validate and update open stateid and open seqid */
ca364317 2618 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2619 lock->lk_new_open_seqid,
2620 &lock->lk_new_open_stateid,
2621 CHECK_FH | OPEN_STATE,
3a65588a 2622 &lock->lk_replay_owner, &open_stp,
b59e3c0e 2623 lock);
37515177 2624 if (status)
1da177e4 2625 goto out;
3a65588a 2626 open_sop = lock->lk_replay_owner;
1da177e4
LT		 2627 /* create lockowner and lock stateid */
2628 fp = open_stp->st_file;
2629 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2630 open_sop->so_client->cl_clientid.cl_id,
2631 &lock->v.new.owner);
3e9e3dbe
N		 2632 /* XXX: Do we need to check for duplicate stateowners on
2633 * the same file, or should they just be allowed (and
2634 * create new stateids)? */
1da177e4 2635 status = nfserr_resource;
b59e3c0e
NB		 2636 lock_sop = alloc_init_lock_stateowner(strhashval,
2637 open_sop->so_client, open_stp, lock);
2638 if (lock_sop == NULL)
1da177e4 2639 goto out;
b59e3c0e 2640 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
8a280510 2641 if (lock_stp == NULL)
1da177e4 2642 goto out;
1da177e4
LT		 2643 } else {
2644 /* lock (lock owner + lock stateid) already exists */
ca364317 2645 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2646 lock->lk_old_lock_seqid,
2647 &lock->lk_old_lock_stateid,
2648 CHECK_FH | LOCK_STATE,
3a65588a 2649 &lock->lk_replay_owner, &lock_stp, lock);
1da177e4
LT		 2650 if (status)
2651 goto out;
3a65588a 2652 lock_sop = lock->lk_replay_owner;
1da177e4 2653 }
3a65588a 2654 /* lock->lk_replay_owner and lock_stp have been created or found */
1da177e4
LT		 2655 filp = lock_stp->st_vfs_file;
2656
0dd395dc
N		 2657 status = nfserr_grace;
2658 if (nfs4_in_grace() && !lock->lk_reclaim)
2659 goto out;
2660 status = nfserr_no_grace;
2661 if (!nfs4_in_grace() && lock->lk_reclaim)
2662 goto out;
2663
1da177e4
LT		 2664 locks_init_lock(&file_lock);
2665 switch (lock->lk_type) {
2666 case NFS4_READ_LT:
2667 case NFS4_READW_LT:
2668 file_lock.fl_type = F_RDLCK;
150b3934 2669 cmd = F_SETLK;
1da177e4
LT		 2670 break;
2671 case NFS4_WRITE_LT:
2672 case NFS4_WRITEW_LT:
2673 file_lock.fl_type = F_WRLCK;
150b3934 2674 cmd = F_SETLK;
1da177e4
LT		 2675 break;
2676 default:
2677 status = nfserr_inval;
2678 goto out;
2679 }
b59e3c0e 2680 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2681 file_lock.fl_pid = current->tgid;
2682 file_lock.fl_file = filp;
2683 file_lock.fl_flags = FL_POSIX;
d5b9026a 2684 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2685
2686 file_lock.fl_start = lock->lk_offset;
2687 if ((lock->lk_length == ~(u64)0) ||
2688 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2689 file_lock.fl_end = ~(u64)0;
2690 else
2691 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2692 nfs4_transform_lock_offset(&file_lock);
2693
2694 /*
2695 * Try to lock the file in the VFS.
2696 * Note: locks.c uses the BKL to protect the inode's lock list.
2697 */
2698
eb76b3fd
AA		 2699 /* XXX?: Just to divert the locks_release_private at the start of
2700 * locks_copy_lock: */
150b3934 2701 locks_init_lock(&conflock);
fd85b817 2702 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
b8dd7b9a 2703 switch (-err) {
1da177e4
LT		 2704 case 0: /* success! */
2705 update_stateid(&lock_stp->st_stateid);
2706 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2707 sizeof(stateid_t));
b8dd7b9a 2708 status = 0;
eb76b3fd
AA		 2709 break;
2710 case (EAGAIN): /* conflock holds conflicting lock */
2711 status = nfserr_denied;
2712 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2713 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2714 break;
1da177e4
LT		 2715 case (EDEADLK):
2716 status = nfserr_deadlock;
eb76b3fd 2717 break;
1da177e4 2718 default:
fd85b817 2719 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
eb76b3fd
AA		 2720 status = nfserr_resource;
2721 break;
1da177e4 2722 }
1da177e4 2723out:
8a280510
BF		 2724 if (status && lock->lk_is_new && lock_sop)
2725 release_stateowner(lock_sop);
3a65588a
BF		 2726 if (lock->lk_replay_owner) {
2727 nfs4_get_stateowner(lock->lk_replay_owner);
a4f1706a 2728 cstate->replay_owner = lock->lk_replay_owner;
f2327d9a 2729 }
1da177e4
LT		 2730 nfs4_unlock_state();
2731 return status;
2732}
2733
2734/*
2735 * LOCKT operation
2736 */
b37ad28b 2737__be32
ca364317
BF		 2738nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2739 struct nfsd4_lockt *lockt)
1da177e4
LT		 2740{
2741 struct inode *inode;
2742 struct file file;
2743 struct file_lock file_lock;
fd85b817 2744 int error;
b37ad28b 2745 __be32 status;
1da177e4
LT		 2746
2747 if (nfs4_in_grace())
2748 return nfserr_grace;
2749
2750 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2751 return nfserr_inval;
2752
2753 lockt->lt_stateowner = NULL;
2754 nfs4_lock_state();
2755
2756 status = nfserr_stale_clientid;
849823c5 2757 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2758 goto out;
1da177e4 2759
ca364317 2760 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
849823c5 2761 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2762 if (status == nfserr_symlink)
2763 status = nfserr_inval;
2764 goto out;
2765 }
2766
ca364317 2767 inode = cstate->current_fh.fh_dentry->d_inode;
1da177e4
LT		 2768 locks_init_lock(&file_lock);
2769 switch (lockt->lt_type) {
2770 case NFS4_READ_LT:
2771 case NFS4_READW_LT:
2772 file_lock.fl_type = F_RDLCK;
2773 break;
2774 case NFS4_WRITE_LT:
2775 case NFS4_WRITEW_LT:
2776 file_lock.fl_type = F_WRLCK;
2777 break;
2778 default:
2fdada03 2779 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
1da177e4
LT		 2780 status = nfserr_inval;
2781 goto out;
2782 }
2783
2784 lockt->lt_stateowner = find_lockstateowner_str(inode,
2785 &lockt->lt_clientid, &lockt->lt_owner);
2786 if (lockt->lt_stateowner)
2787 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2788 file_lock.fl_pid = current->tgid;
2789 file_lock.fl_flags = FL_POSIX;
d5b9026a 2790 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2791
2792 file_lock.fl_start = lockt->lt_offset;
2793 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2794 file_lock.fl_end = ~(u64)0;
2795 else
2796 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2797
2798 nfs4_transform_lock_offset(&file_lock);
2799
fd85b817 2800 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
1da177e4 2801 * since LOCKT doesn't require an OPEN, and therefore a struct
fd85b817 2802 * file may not exist, pass vfs_test_lock a struct file with
1da177e4
LT		 2803 * only the dentry:inode set.
2804 */
2805 memset(&file, 0, sizeof (struct file));
ca364317 2806 file.f_path.dentry = cstate->current_fh.fh_dentry;
1da177e4
LT		 2807
2808 status = nfs_ok;
fd85b817
ME		 2809 error = vfs_test_lock(&file, &file_lock);
2810 if (error) {
2811 status = nfserrno(error);
2812 goto out;
2813 }
9d6a8c5c 2814 if (file_lock.fl_type != F_UNLCK) {
1da177e4 2815 status = nfserr_denied;
9d6a8c5c 2816 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
1da177e4
LT		 2817 }
2818out:
2819 nfs4_unlock_state();
2820 return status;
2821}
2822
b37ad28b 2823__be32
ca364317 2824nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
a4f1706a 2825 struct nfsd4_locku *locku)
1da177e4
LT		 2826{
2827 struct nfs4_stateid *stp;
2828 struct file *filp = NULL;
2829 struct file_lock file_lock;
b37ad28b 2830 __be32 status;
b8dd7b9a 2831 int err;
1da177e4
LT		 2832
2833 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2834 (long long) locku->lu_offset,
2835 (long long) locku->lu_length);
2836
2837 if (check_lock_length(locku->lu_offset, locku->lu_length))
2838 return nfserr_inval;
2839
2840 nfs4_lock_state();
2841
ca364317 2842 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
1da177e4
LT		 2843 locku->lu_seqid,
2844 &locku->lu_stateid,
2845 CHECK_FH | LOCK_STATE,
2846 &locku->lu_stateowner, &stp, NULL)))
2847 goto out;
2848
2849 filp = stp->st_vfs_file;
2850 BUG_ON(!filp);
2851 locks_init_lock(&file_lock);
2852 file_lock.fl_type = F_UNLCK;
2853 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2854 file_lock.fl_pid = current->tgid;
2855 file_lock.fl_file = filp;
2856 file_lock.fl_flags = FL_POSIX;
d5b9026a 2857 file_lock.fl_lmops = &nfsd_posix_mng_ops;
1da177e4
LT		 2858 file_lock.fl_start = locku->lu_offset;
2859
2860 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2861 file_lock.fl_end = ~(u64)0;
2862 else
2863 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2864 nfs4_transform_lock_offset(&file_lock);
2865
2866 /*
2867 * Try to unlock the file in the VFS.
2868 */
fd85b817 2869 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
b8dd7b9a 2870 if (err) {
fd85b817 2871 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
1da177e4
LT		 2872 goto out_nfserr;
2873 }
2874 /*
2875 * OK, unlock succeeded; the only thing left to do is update the stateid.
2876 */
2877 update_stateid(&stp->st_stateid);
2878 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2879
2880out:
f2327d9a 2881 if (locku->lu_stateowner) {
1da177e4 2882 nfs4_get_stateowner(locku->lu_stateowner);
a4f1706a 2883 cstate->replay_owner = locku->lu_stateowner;
f2327d9a 2884 }
1da177e4
LT		 2885 nfs4_unlock_state();
2886 return status;
2887
2888out_nfserr:
b8dd7b9a 2889 status = nfserrno(err);
1da177e4
LT		 2890 goto out;
2891}
2892
2893/*
2894 * returns
2895 * 1: locks held by lockowner
2896 * 0: no locks held by lockowner
2897 */
2898static int
2899check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2900{
2901 struct file_lock **flpp;
7eaa36e2 2902 struct inode *inode = filp->f_path.dentry->d_inode;
1da177e4
LT		 2903 int status = 0;
2904
2905 lock_kernel();
2906 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
796dadfd 2907 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
1da177e4
LT		 2908 status = 1;
2909 goto out;
796dadfd 2910 }
1da177e4
LT		 2911 }
2912out:
2913 unlock_kernel();
2914 return status;
2915}
2916
b37ad28b 2917__be32
b591480b
BF		 2918nfsd4_release_lockowner(struct svc_rqst *rqstp,
2919 struct nfsd4_compound_state *cstate,
2920 struct nfsd4_release_lockowner *rlockowner)
1da177e4
LT		 2921{
2922 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 2923 struct nfs4_stateowner *sop;
2924 struct nfs4_stateid *stp;
1da177e4 2925 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 2926 struct list_head matches;
2927 int i;
b37ad28b 2928 __be32 status;
1da177e4
LT		 2929
2930 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2931 clid->cl_boot, clid->cl_id);
2932
2933 /* XXX check for lease expiration */
2934
2935 status = nfserr_stale_clientid;
849823c5 2936 if (STALE_CLIENTID(clid))
1da177e4 2937 return status;
1da177e4
LT		 2938
2939 nfs4_lock_state();
2940
3e9e3dbe
N		 2941 status = nfserr_locks_held;
2942 /* XXX: we're doing a linear search through all the lockowners.
2943 * Yipes! For now we'll just hope clients aren't really using
2944 * release_lockowner much, but eventually we have to fix these
2945 * data structures. */
2946 INIT_LIST_HEAD(&matches);
2947 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2948 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
599e0a22 2949 if (!same_owner_str(sop, owner, clid))
3e9e3dbe
N		 2950 continue;
2951 list_for_each_entry(stp, &sop->so_stateids,
2952 st_perstateowner) {
2953 if (check_for_locks(stp->st_vfs_file, sop))
2954 goto out;
2955 /* Note: so_perclient unused for lockowners,
2956 * so it's OK to fool with here. */
2957 list_add(&sop->so_perclient, &matches);
2958 }
1da177e4 2959 }
3e9e3dbe
N		 2960 }
2961 /* Clients probably won't expect us to return with some (but not all)
2962 * of the lockowner state released; so don't release any until all
2963 * have been checked. */
2964 status = nfs_ok;
0fa822e4
N		 2965 while (!list_empty(&matches)) {
2966 sop = list_entry(matches.next, struct nfs4_stateowner,
2967 so_perclient);
2968 /* unhash_stateowner deletes so_perclient only
2969 * for openowners. */
2970 list_del(&sop->so_perclient);
3e9e3dbe 2971 release_stateowner(sop);
1da177e4
LT		 2972 }
2973out:
2974 nfs4_unlock_state();
2975 return status;
2976}
2977
2978static inline struct nfs4_client_reclaim *
a55370a3 2979alloc_reclaim(void)
1da177e4 2980{
a55370a3 2981 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 2982}
2983
c7b9a459
N		 2984int
2985nfs4_has_reclaimed_state(const char *name)
2986{
2987 unsigned int strhashval = clientstr_hashval(name);
2988 struct nfs4_client *clp;
2989
2990 clp = find_confirmed_client_by_str(name, strhashval);
2991 return clp ? 1 : 0;
2992}
2993
1da177e4
LT		 2994/*
2995 * failure => all reset bets are off, nfserr_no_grace...
2996 */
190e4fbf
N		 2997int
2998nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 2999{
3000 unsigned int strhashval;
3001 struct nfs4_client_reclaim *crp = NULL;
3002
a55370a3
N		 3003 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3004 crp = alloc_reclaim();
1da177e4
LT		 3005 if (!crp)
3006 return 0;
a55370a3 3007 strhashval = clientstr_hashval(name);
1da177e4
LT		 3008 INIT_LIST_HEAD(&crp->cr_strhash);
3009 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3010 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3011 reclaim_str_hashtbl_size++;
3012 return 1;
3013}
3014
3015static void
3016nfs4_release_reclaim(void)
3017{
3018 struct nfs4_client_reclaim *crp = NULL;
3019 int i;
3020
1da177e4
LT		 3021 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3022 while (!list_empty(&reclaim_str_hashtbl[i])) {
3023 crp = list_entry(reclaim_str_hashtbl[i].next,
3024 struct nfs4_client_reclaim, cr_strhash);
3025 list_del(&crp->cr_strhash);
1da177e4
LT		 3026 kfree(crp);
3027 reclaim_str_hashtbl_size--;
3028 }
3029 }
3030 BUG_ON(reclaim_str_hashtbl_size);
3031}
3032
3033/*
3034 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3035static struct nfs4_client_reclaim *
1da177e4
LT		 3036nfs4_find_reclaim_client(clientid_t *clid)
3037{
3038 unsigned int strhashval;
3039 struct nfs4_client *clp;
3040 struct nfs4_client_reclaim *crp = NULL;
3041
3042
3043 /* find clientid in conf_id_hashtbl */
3044 clp = find_confirmed_client(clid);
3045 if (clp == NULL)
3046 return NULL;
3047
a55370a3
N		 3048 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3049 clp->cl_name.len, clp->cl_name.data,
3050 clp->cl_recdir);
1da177e4
LT		 3051
3052 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3053 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3054 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3055 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3056 return crp;
3057 }
3058 }
3059 return NULL;
3060}
3061
3062/*
3063* Called from OPEN. Look for clientid in reclaim list.
3064*/
b37ad28b 3065__be32
1da177e4
LT		 3066nfs4_check_open_reclaim(clientid_t *clid)
3067{
dfc83565 3068 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3069}
3070
ac4d8ff2 3071/* initialization to perform at module load time: */
1da177e4 3072
e8ff2a84 3073int
ac4d8ff2 3074nfs4_state_init(void)
1da177e4 3075{
e8ff2a84 3076 int i, status;
1da177e4 3077
e8ff2a84
BF		 3078 status = nfsd4_init_slabs();
3079 if (status)
3080 return status;
1da177e4
LT		 3081 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3082 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3083 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3084 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3085 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3086 }
3087 for (i = 0; i < FILE_HASH_SIZE; i++) {
3088 INIT_LIST_HEAD(&file_hashtbl[i]);
3089 }
3090 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3091 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3092 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3093 }
3094 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3095 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3096 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3097 }
3098 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3099 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3100 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3101 }
1da177e4 3102 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3103 INIT_LIST_HEAD(&close_lru);
3104 INIT_LIST_HEAD(&client_lru);
3105 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3106 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3107 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3108 reclaim_str_hashtbl_size = 0;
e8ff2a84 3109 return 0;
ac4d8ff2
N		 3110}
3111
190e4fbf
N		 3112static void
3113nfsd4_load_reboot_recovery_data(void)
3114{
3115 int status;
3116
0964a3d3
N		 3117 nfs4_lock_state();
3118 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3119 status = nfsd4_recdir_load();
0964a3d3 3120 nfs4_unlock_state();
190e4fbf
N		 3121 if (status)
3122 printk("NFSD: Failure reading reboot recovery data\n");
3123}
3124
9a8db97e
ME		 3125unsigned long
3126get_nfs4_grace_period(void)
3127{
3128 return max(user_lease_time, lease_time) * HZ;
3129}
3130
c2f1a551
MS		 3131/*
3132 * Since the lifetime of a delegation isn't limited to that of an open, a
3133 * client may quite reasonably hang on to a delegation as long as it has
3134 * the inode cached. This becomes an obvious problem the first time a
3135 * client's inode cache approaches the size of the server's total memory.
3136 *
3137 * For now we avoid this problem by imposing a hard limit on the number
3138 * of delegations, which varies according to the server's memory size.
3139 */
3140static void
3141set_max_delegations(void)
3142{
3143 /*
3144 * Allow at most 4 delegations per megabyte of RAM. Quick
3145 * estimates suggest that in the worst case (where every delegation
3146 * is for a different inode), a delegation could take about 1.5K,
3147 * giving a worst case usage of about 6% of memory.
3148 */
3149 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3150}
3151
ac4d8ff2
N		 3152/* initialization to perform when the nfsd service is started: */
3153
3154static void
3155__nfs4_state_start(void)
3156{
9a8db97e 3157 unsigned long grace_time;
ac4d8ff2 3158
1da177e4 3159 boot_time = get_seconds();
9a8db97e 3160 grace_time = get_nfs_grace_period();
d99a05ad 3161 lease_time = user_lease_time;
a76b4319 3162 in_grace = 1;
9a8db97e
ME		 3163 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3164 grace_time/HZ);
58da282b 3165 laundry_wq = create_singlethread_workqueue("nfsd4");
9a8db97e 3166 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
c2f1a551 3167 set_max_delegations();
1da177e4
LT		 3168}
3169
e8ff2a84 3170void
76a3550e 3171nfs4_state_start(void)
1da177e4 3172{
1da177e4 3173 if (nfs4_init)
e8ff2a84 3174 return;
190e4fbf 3175 nfsd4_load_reboot_recovery_data();
76a3550e 3176 __nfs4_state_start();
1da177e4 3177 nfs4_init = 1;
e8ff2a84 3178 return;
1da177e4
LT		 3179}
3180
3181int
3182nfs4_in_grace(void)
3183{
a76b4319 3184 return in_grace;
1da177e4
LT		 3185}
3186
3187time_t
3188nfs4_lease_time(void)
3189{
3190 return lease_time;
3191}
3192
3193static void
3194__nfs4_state_shutdown(void)
3195{
3196 int i;
3197 struct nfs4_client *clp = NULL;
3198 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 3199 struct list_head *pos, *next, reaplist;
3200
1da177e4
LT		 3201 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3202 while (!list_empty(&conf_id_hashtbl[i])) {
3203 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3204 expire_client(clp);
3205 }
3206 while (!list_empty(&unconf_str_hashtbl[i])) {
3207 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3208 expire_client(clp);
3209 }
3210 }
3211 INIT_LIST_HEAD(&reaplist);
3212 spin_lock(&recall_lock);
3213 list_for_each_safe(pos, next, &del_recall_lru) {
3214 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3215 list_move(&dp->dl_recall_lru, &reaplist);
3216 }
3217 spin_unlock(&recall_lock);
3218 list_for_each_safe(pos, next, &reaplist) {
3219 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3220 list_del_init(&dp->dl_recall_lru);
3221 unhash_delegation(dp);
3222 }
3223
190e4fbf 3224 nfsd4_shutdown_recdir();
1da177e4 3225 nfs4_init = 0;
1da177e4
LT		 3226}
3227
3228void
3229nfs4_state_shutdown(void)
3230{
5e8d5c29
N		 3231 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3232 destroy_workqueue(laundry_wq);
1da177e4
LT		 3233 nfs4_lock_state();
3234 nfs4_release_reclaim();
3235 __nfs4_state_shutdown();
1da177e4
LT		 3236 nfs4_unlock_state();
3237}
3238
0964a3d3
N		 3239static void
3240nfs4_set_recdir(char *recdir)
3241{
3242 nfs4_lock_state();
3243 strcpy(user_recovery_dirname, recdir);
3244 nfs4_unlock_state();
3245}
3246
3247/*
3248 * Change the NFSv4 recovery directory to recdir.
3249 */
3250int
3251nfs4_reset_recoverydir(char *recdir)
3252{
3253 int status;
3254 struct nameidata nd;
3255
3256 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3257 if (status)
3258 return status;
3259 status = -ENOTDIR;
3260 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3261 nfs4_set_recdir(recdir);
3262 status = 0;
3263 }
3264 path_release(&nd);
3265 return status;
3266}
3267
1da177e4
LT		 3268/*
3269 * Called when leasetime is changed.
3270 *
d99a05ad
N		 3271 * The only way the protocol gives us to handle on-the-fly lease changes is to
3272 * simulate a reboot. Instead of doing that, we just wait till the next time
3273 * we start to register any changes in lease time. If the administrator
3274 * really wants to change the lease time *now*, they can go ahead and bring
3275 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3276 */
3277void
3278nfs4_reset_lease(time_t leasetime)
3279{
d99a05ad
N		 3280 lock_kernel();
3281 user_lease_time = leasetime;
3282 unlock_kernel();
1da177e4 3283}
Linux 6.x block layer and io_uring tree(s)