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[PATCH] nfsd4: fix setclientid unlock of unlocked state lock
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
1da177e4
LT		 52
53#define NFSDDBG_FACILITY NFSDDBG_PROC
54
55/* Globals */
56static time_t lease_time = 90; /* default lease time */
d99a05ad 57static time_t user_lease_time = 90;
fd39ca9a 58static time_t boot_time;
a76b4319 59static int in_grace = 1;
1da177e4
LT		 60static u32 current_clientid = 1;
61static u32 current_ownerid = 1;
62static u32 current_fileid = 1;
63static u32 current_delegid = 1;
64static u32 nfs4_init;
fd39ca9a
N		 65static stateid_t zerostateid; /* bits all 0 */
66static stateid_t onestateid; /* bits all 1 */
67
68#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
69#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 70
1da177e4 71/* forward declarations */
fd39ca9a 72static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 73static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
74static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
0964a3d3
N		 75static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
76static void nfs4_set_recdir(char *recdir);
1da177e4
LT		 77
78/* Locking:
79 *
80 * client_sema:
81 * protects clientid_hashtbl[], clientstr_hashtbl[],
82 * unconfstr_hashtbl[], uncofid_hashtbl[].
83 */
84static DECLARE_MUTEX(client_sema);
85
fd39ca9a
N		 86static kmem_cache_t *stateowner_slab = NULL;
87static kmem_cache_t *file_slab = NULL;
88static kmem_cache_t *stateid_slab = NULL;
89static kmem_cache_t *deleg_slab = NULL;
e60d4398 90
1da177e4
LT		 91void
92nfs4_lock_state(void)
93{
94 down(&client_sema);
95}
96
97void
98nfs4_unlock_state(void)
99{
100 up(&client_sema);
101}
102
103static inline u32
104opaque_hashval(const void *ptr, int nbytes)
105{
106 unsigned char *cptr = (unsigned char *) ptr;
107
108 u32 x = 0;
109 while (nbytes--) {
110 x *= 37;
111 x += *cptr++;
112 }
113 return x;
114}
115
116/* forward declarations */
117static void release_stateowner(struct nfs4_stateowner *sop);
118static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 119
120/*
121 * Delegation state
122 */
123
124/* recall_lock protects the del_recall_lru */
fd39ca9a 125static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 126static struct list_head del_recall_lru;
127
13cd2184
N		 128static void
129free_nfs4_file(struct kref *kref)
130{
131 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
132 list_del(&fp->fi_hash);
133 iput(fp->fi_inode);
134 kmem_cache_free(file_slab, fp);
135}
136
137static inline void
138put_nfs4_file(struct nfs4_file *fi)
139{
140 kref_put(&fi->fi_ref, free_nfs4_file);
141}
142
143static inline void
144get_nfs4_file(struct nfs4_file *fi)
145{
146 kref_get(&fi->fi_ref);
147}
148
1da177e4
LT		 149static struct nfs4_delegation *
150alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
151{
152 struct nfs4_delegation *dp;
153 struct nfs4_file *fp = stp->st_file;
154 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
155
156 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 157 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
158 if (dp == NULL)
1da177e4 159 return dp;
ea1da636
N		 160 INIT_LIST_HEAD(&dp->dl_perfile);
161 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 162 INIT_LIST_HEAD(&dp->dl_recall_lru);
163 dp->dl_client = clp;
13cd2184 164 get_nfs4_file(fp);
1da177e4
LT		 165 dp->dl_file = fp;
166 dp->dl_flock = NULL;
167 get_file(stp->st_vfs_file);
168 dp->dl_vfs_file = stp->st_vfs_file;
169 dp->dl_type = type;
170 dp->dl_recall.cbr_dp = NULL;
171 dp->dl_recall.cbr_ident = cb->cb_ident;
172 dp->dl_recall.cbr_trunc = 0;
173 dp->dl_stateid.si_boot = boot_time;
174 dp->dl_stateid.si_stateownerid = current_delegid++;
175 dp->dl_stateid.si_fileid = 0;
176 dp->dl_stateid.si_generation = 0;
177 dp->dl_fhlen = current_fh->fh_handle.fh_size;
178 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
179 current_fh->fh_handle.fh_size);
180 dp->dl_time = 0;
181 atomic_set(&dp->dl_count, 1);
ea1da636
N		 182 list_add(&dp->dl_perfile, &fp->fi_delegations);
183 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 184 return dp;
185}
186
187void
188nfs4_put_delegation(struct nfs4_delegation *dp)
189{
190 if (atomic_dec_and_test(&dp->dl_count)) {
191 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 192 put_nfs4_file(dp->dl_file);
5b2d21c1 193 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 194 }
195}
196
197/* Remove the associated file_lock first, then remove the delegation.
198 * lease_modify() is called to remove the FS_LEASE file_lock from
199 * the i_flock list, eventually calling nfsd's lock_manager
200 * fl_release_callback.
201 */
202static void
203nfs4_close_delegation(struct nfs4_delegation *dp)
204{
205 struct file *filp = dp->dl_vfs_file;
206
207 dprintk("NFSD: close_delegation dp %p\n",dp);
208 dp->dl_vfs_file = NULL;
209 /* The following nfsd_close may not actually close the file,
210 * but we want to remove the lease in any case. */
c907132d
N		 211 if (dp->dl_flock)
212 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 213 nfsd_close(filp);
1da177e4
LT		 214}
215
216/* Called under the state lock. */
217static void
218unhash_delegation(struct nfs4_delegation *dp)
219{
ea1da636
N		 220 list_del_init(&dp->dl_perfile);
221 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 222 spin_lock(&recall_lock);
223 list_del_init(&dp->dl_recall_lru);
224 spin_unlock(&recall_lock);
225 nfs4_close_delegation(dp);
226 nfs4_put_delegation(dp);
227}
228
229/*
230 * SETCLIENTID state
231 */
232
233/* Hash tables for nfs4_clientid state */
234#define CLIENT_HASH_BITS 4
235#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
236#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
237
238#define clientid_hashval(id) \
239 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 240#define clientstr_hashval(name) \
241 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 242/*
243 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
244 * used in reboot/reset lease grace period processing
245 *
246 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
247 * setclientid_confirmed info.
248 *
249 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
250 * setclientid info.
251 *
252 * client_lru holds client queue ordered by nfs4_client.cl_time
253 * for lease renewal.
254 *
255 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
256 * for last close replay.
257 */
258static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
259static int reclaim_str_hashtbl_size = 0;
260static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
262static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
263static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
264static struct list_head client_lru;
265static struct list_head close_lru;
266
267static inline void
268renew_client(struct nfs4_client *clp)
269{
270 /*
271 * Move client to the end to the LRU list.
272 */
273 dprintk("renewing client (clientid %08x/%08x)\n",
274 clp->cl_clientid.cl_boot,
275 clp->cl_clientid.cl_id);
276 list_move_tail(&clp->cl_lru, &client_lru);
277 clp->cl_time = get_seconds();
278}
279
280/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
281static int
282STALE_CLIENTID(clientid_t *clid)
283{
284 if (clid->cl_boot == boot_time)
285 return 0;
286 dprintk("NFSD stale clientid (%08x/%08x)\n",
287 clid->cl_boot, clid->cl_id);
288 return 1;
289}
290
291/*
292 * XXX Should we use a slab cache ?
293 * This type of memory management is somewhat inefficient, but we use it
294 * anyway since SETCLIENTID is not a common operation.
295 */
296static inline struct nfs4_client *
297alloc_client(struct xdr_netobj name)
298{
299 struct nfs4_client *clp;
300
301 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
302 memset(clp, 0, sizeof(*clp));
303 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
304 memcpy(clp->cl_name.data, name.data, name.len);
305 clp->cl_name.len = name.len;
306 }
307 else {
308 kfree(clp);
309 clp = NULL;
310 }
311 }
312 return clp;
313}
314
315static inline void
316free_client(struct nfs4_client *clp)
317{
318 if (clp->cl_cred.cr_group_info)
319 put_group_info(clp->cl_cred.cr_group_info);
320 kfree(clp->cl_name.data);
321 kfree(clp);
322}
323
324void
325put_nfs4_client(struct nfs4_client *clp)
326{
327 if (atomic_dec_and_test(&clp->cl_count))
328 free_client(clp);
329}
330
331static void
332expire_client(struct nfs4_client *clp)
333{
334 struct nfs4_stateowner *sop;
335 struct nfs4_delegation *dp;
336 struct nfs4_callback *cb = &clp->cl_callback;
337 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
338 struct list_head reaplist;
339
340 dprintk("NFSD: expire_client cl_count %d\n",
341 atomic_read(&clp->cl_count));
342
343 /* shutdown rpc client, ending any outstanding recall rpcs */
344 if (atomic_read(&cb->cb_set) == 1 && clnt) {
345 rpc_shutdown_client(clnt);
346 clnt = clp->cl_callback.cb_client = NULL;
347 }
348
349 INIT_LIST_HEAD(&reaplist);
350 spin_lock(&recall_lock);
ea1da636
N		 351 while (!list_empty(&clp->cl_delegations)) {
352 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 353 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
354 dp->dl_flock);
ea1da636 355 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 356 list_move(&dp->dl_recall_lru, &reaplist);
357 }
358 spin_unlock(&recall_lock);
359 while (!list_empty(&reaplist)) {
360 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
361 list_del_init(&dp->dl_recall_lru);
362 unhash_delegation(dp);
363 }
364 list_del(&clp->cl_idhash);
365 list_del(&clp->cl_strhash);
366 list_del(&clp->cl_lru);
ea1da636
N		 367 while (!list_empty(&clp->cl_openowners)) {
368 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 369 release_stateowner(sop);
370 }
371 put_nfs4_client(clp);
372}
373
374static struct nfs4_client *
a55370a3 375create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 376 struct nfs4_client *clp;
377
378 if (!(clp = alloc_client(name)))
379 goto out;
a55370a3 380 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 381 atomic_set(&clp->cl_count, 1);
382 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 383 INIT_LIST_HEAD(&clp->cl_idhash);
384 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 385 INIT_LIST_HEAD(&clp->cl_openowners);
386 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 387 INIT_LIST_HEAD(&clp->cl_lru);
388out:
389 return clp;
390}
391
392static void
393copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
394 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
395}
396
397static void
398copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
399 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
400 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
401}
402
403static void
404copy_cred(struct svc_cred *target, struct svc_cred *source) {
405
406 target->cr_uid = source->cr_uid;
407 target->cr_gid = source->cr_gid;
408 target->cr_group_info = source->cr_group_info;
409 get_group_info(target->cr_group_info);
410}
411
a55370a3
N		 412static inline int
413same_name(const char *n1, const char *n2) {
414 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 415}
416
417static int
418cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
419 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
420}
421
422static int
423cmp_clid(clientid_t * cl1, clientid_t * cl2) {
424 return((cl1->cl_boot == cl2->cl_boot) &&
425 (cl1->cl_id == cl2->cl_id));
426}
427
428/* XXX what about NGROUP */
429static int
430cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
431 return(cr1->cr_uid == cr2->cr_uid);
432
433}
434
435static void
436gen_clid(struct nfs4_client *clp) {
437 clp->cl_clientid.cl_boot = boot_time;
438 clp->cl_clientid.cl_id = current_clientid++;
439}
440
441static void
442gen_confirm(struct nfs4_client *clp) {
443 struct timespec tv;
444 u32 * p;
445
446 tv = CURRENT_TIME;
447 p = (u32 *)clp->cl_confirm.data;
448 *p++ = tv.tv_sec;
449 *p++ = tv.tv_nsec;
450}
451
452static int
453check_name(struct xdr_netobj name) {
454
455 if (name.len == 0)
456 return 0;
457 if (name.len > NFS4_OPAQUE_LIMIT) {
458 printk("NFSD: check_name: name too long(%d)!\n", name.len);
459 return 0;
460 }
461 return 1;
462}
463
fd39ca9a 464static void
1da177e4
LT		 465add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
466{
467 unsigned int idhashval;
468
469 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
470 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
471 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
472 list_add_tail(&clp->cl_lru, &client_lru);
473 clp->cl_time = get_seconds();
474}
475
fd39ca9a 476static void
1da177e4
LT		 477move_to_confirmed(struct nfs4_client *clp)
478{
479 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
480 unsigned int strhashval;
481
482 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
483 list_del_init(&clp->cl_strhash);
484 list_del_init(&clp->cl_idhash);
485 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 486 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 487 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
488 renew_client(clp);
489}
490
491static struct nfs4_client *
492find_confirmed_client(clientid_t *clid)
493{
494 struct nfs4_client *clp;
495 unsigned int idhashval = clientid_hashval(clid->cl_id);
496
497 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
498 if (cmp_clid(&clp->cl_clientid, clid))
499 return clp;
500 }
501 return NULL;
502}
503
504static struct nfs4_client *
505find_unconfirmed_client(clientid_t *clid)
506{
507 struct nfs4_client *clp;
508 unsigned int idhashval = clientid_hashval(clid->cl_id);
509
510 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
511 if (cmp_clid(&clp->cl_clientid, clid))
512 return clp;
513 }
514 return NULL;
515}
516
28ce6054
N		 517static struct nfs4_client *
518find_confirmed_client_by_str(const char *dname, unsigned int hashval)
519{
520 struct nfs4_client *clp;
521
522 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
523 if (same_name(clp->cl_recdir, dname))
524 return clp;
525 }
526 return NULL;
527}
528
529static struct nfs4_client *
530find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
531{
532 struct nfs4_client *clp;
533
534 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
535 if (same_name(clp->cl_recdir, dname))
536 return clp;
537 }
538 return NULL;
539}
540
1da177e4
LT		 541/* a helper function for parse_callback */
542static int
543parse_octet(unsigned int *lenp, char **addrp)
544{
545 unsigned int len = *lenp;
546 char *p = *addrp;
547 int n = -1;
548 char c;
549
550 for (;;) {
551 if (!len)
552 break;
553 len--;
554 c = *p++;
555 if (c == '.')
556 break;
557 if ((c < '0') || (c > '9')) {
558 n = -1;
559 break;
560 }
561 if (n < 0)
562 n = 0;
563 n = (n * 10) + (c - '0');
564 if (n > 255) {
565 n = -1;
566 break;
567 }
568 }
569 *lenp = len;
570 *addrp = p;
571 return n;
572}
573
574/* parse and set the setclientid ipv4 callback address */
fd39ca9a 575static int
1da177e4
LT		 576parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
577{
578 int temp = 0;
579 u32 cbaddr = 0;
580 u16 cbport = 0;
581 u32 addrlen = addr_len;
582 char *addr = addr_val;
583 int i, shift;
584
585 /* ipaddress */
586 shift = 24;
587 for(i = 4; i > 0 ; i--) {
588 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
589 return 0;
590 }
591 cbaddr |= (temp << shift);
592 if (shift > 0)
593 shift -= 8;
594 }
595 *cbaddrp = cbaddr;
596
597 /* port */
598 shift = 8;
599 for(i = 2; i > 0 ; i--) {
600 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
601 return 0;
602 }
603 cbport |= (temp << shift);
604 if (shift > 0)
605 shift -= 8;
606 }
607 *cbportp = cbport;
608 return 1;
609}
610
fd39ca9a 611static void
1da177e4
LT		 612gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
613{
614 struct nfs4_callback *cb = &clp->cl_callback;
615
616 /* Currently, we only support tcp for the callback channel */
617 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
618 goto out_err;
619
620 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
621 &cb->cb_addr, &cb->cb_port)))
622 goto out_err;
623 cb->cb_prog = se->se_callback_prog;
624 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 625 return;
626out_err:
849823c5 627 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1da177e4
LT		 628 "will not receive delegations\n",
629 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
630
1da177e4
LT		 631 return;
632}
633
634/*
635 * RFC 3010 has a complex implmentation description of processing a
636 * SETCLIENTID request consisting of 5 bullets, labeled as
637 * CASE0 - CASE4 below.
638 *
639 * NOTES:
640 * callback information will be processed in a future patch
641 *
642 * an unconfirmed record is added when:
643 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
644 * CASE 1: confirmed record found with matching name, principal,
645 * verifier, and clientid.
646 * CASE 2: confirmed record found with matching name, principal,
647 * and there is no unconfirmed record with matching
648 * name and principal
649 *
650 * an unconfirmed record is replaced when:
651 * CASE 3: confirmed record found with matching name, principal,
652 * and an unconfirmed record is found with matching
653 * name, principal, and with clientid and
654 * confirm that does not match the confirmed record.
655 * CASE 4: there is no confirmed record with matching name and
656 * principal. there is an unconfirmed record with
657 * matching name, principal.
658 *
659 * an unconfirmed record is deleted when:
660 * CASE 1: an unconfirmed record that matches input name, verifier,
661 * and confirmed clientid.
662 * CASE 4: any unconfirmed records with matching name and principal
663 * that exist after an unconfirmed record has been replaced
664 * as described above.
665 *
666 */
667int
668nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
669{
670 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
671 struct xdr_netobj clname = {
672 .len = setclid->se_namelen,
673 .data = setclid->se_name,
674 };
675 nfs4_verifier clverifier = setclid->se_verf;
676 unsigned int strhashval;
28ce6054 677 struct nfs4_client *conf, *unconf, *new;
1da177e4 678 int status;
a55370a3 679 char dname[HEXDIR_LEN];
1da177e4 680
1da177e4 681 if (!check_name(clname))
73aea4ec 682 return nfserr_inval;
1da177e4 683
a55370a3
N		 684 status = nfs4_make_rec_clidname(dname, &clname);
685 if (status)
73aea4ec 686 return status;
a55370a3 687
1da177e4
LT		 688 /*
689 * XXX The Duplicate Request Cache (DRC) has been checked (??)
690 * We get here on a DRC miss.
691 */
692
a55370a3 693 strhashval = clientstr_hashval(dname);
1da177e4 694
1da177e4 695 nfs4_lock_state();
28ce6054
N		 696 conf = find_confirmed_client_by_str(dname, strhashval);
697 if (conf) {
1da177e4
LT		 698 /*
699 * CASE 0:
700 * clname match, confirmed, different principal
701 * or different ip_address
702 */
703 status = nfserr_clid_inuse;
28ce6054
N		 704 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
705 || conf->cl_addr != ip_addr) {
1da177e4
LT		 706 printk("NFSD: setclientid: string in use by client"
707 "(clientid %08x/%08x)\n",
28ce6054 708 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 709 goto out;
710 }
1da177e4 711 }
28ce6054 712 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 713 status = nfserr_resource;
714 if (!conf) {
715 /*
716 * CASE 4:
717 * placed first, because it is the normal case.
718 */
719 if (unconf)
720 expire_client(unconf);
a55370a3
N		 721 new = create_client(clname, dname);
722 if (new == NULL)
1da177e4
LT		 723 goto out;
724 copy_verf(new, &clverifier);
725 new->cl_addr = ip_addr;
726 copy_cred(&new->cl_cred,&rqstp->rq_cred);
727 gen_clid(new);
728 gen_confirm(new);
729 gen_callback(new, setclid);
730 add_to_unconfirmed(new, strhashval);
731 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
732 /*
733 * CASE 1:
734 * cl_name match, confirmed, principal match
735 * verifier match: probable callback update
736 *
737 * remove any unconfirmed nfs4_client with
738 * matching cl_name, cl_verifier, and cl_clientid
739 *
740 * create and insert an unconfirmed nfs4_client with same
741 * cl_name, cl_verifier, and cl_clientid as existing
742 * nfs4_client, but with the new callback info and a
743 * new cl_confirm
744 */
31f4a6c1
N		 745 if (unconf) {
746 /* Note this is removing unconfirmed {*x***},
747 * which is stronger than RFC recommended {vxc**}.
748 * This has the advantage that there is at most
749 * one {*x***} in either list at any time.
750 */
751 expire_client(unconf);
1da177e4 752 }
a55370a3
N		 753 new = create_client(clname, dname);
754 if (new == NULL)
1da177e4
LT		 755 goto out;
756 copy_verf(new,&conf->cl_verifier);
757 new->cl_addr = ip_addr;
758 copy_cred(&new->cl_cred,&rqstp->rq_cred);
759 copy_clid(new, conf);
760 gen_confirm(new);
761 gen_callback(new, setclid);
762 add_to_unconfirmed(new,strhashval);
763 } else if (!unconf) {
764 /*
765 * CASE 2:
766 * clname match, confirmed, principal match
767 * verfier does not match
768 * no unconfirmed. create a new unconfirmed nfs4_client
769 * using input clverifier, clname, and callback info
770 * and generate a new cl_clientid and cl_confirm.
771 */
a55370a3
N		 772 new = create_client(clname, dname);
773 if (new == NULL)
1da177e4
LT		 774 goto out;
775 copy_verf(new,&clverifier);
776 new->cl_addr = ip_addr;
777 copy_cred(&new->cl_cred,&rqstp->rq_cred);
778 gen_clid(new);
779 gen_confirm(new);
780 gen_callback(new, setclid);
781 add_to_unconfirmed(new, strhashval);
782 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
783 /*
784 * CASE3:
785 * confirmed found (name, principal match)
786 * confirmed verifier does not match input clverifier
787 *
788 * unconfirmed found (name match)
789 * confirmed->cl_confirm != unconfirmed->cl_confirm
790 *
791 * remove unconfirmed.
792 *
793 * create an unconfirmed nfs4_client
794 * with same cl_name as existing confirmed nfs4_client,
795 * but with new callback info, new cl_clientid,
796 * new cl_verifier and a new cl_confirm
797 */
798 expire_client(unconf);
a55370a3
N		 799 new = create_client(clname, dname);
800 if (new == NULL)
1da177e4
LT		 801 goto out;
802 copy_verf(new,&clverifier);
803 new->cl_addr = ip_addr;
804 copy_cred(&new->cl_cred,&rqstp->rq_cred);
805 gen_clid(new);
806 gen_confirm(new);
807 gen_callback(new, setclid);
808 add_to_unconfirmed(new, strhashval);
809 } else {
810 /* No cases hit !!! */
811 status = nfserr_inval;
812 goto out;
813
814 }
815 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
816 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
817 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
818 status = nfs_ok;
819out:
820 nfs4_unlock_state();
821 return status;
822}
823
824
825/*
826 * RFC 3010 has a complex implmentation description of processing a
827 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
828 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
829 *
830 * NOTE: callback information will be processed here in a future patch
831 */
832int
833nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
834{
835 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
21ab45a4 836 struct nfs4_client *conf, *unconf;
1da177e4
LT		 837 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
838 clientid_t * clid = &setclientid_confirm->sc_clientid;
839 int status;
840
841 if (STALE_CLIENTID(clid))
842 return nfserr_stale_clientid;
843 /*
844 * XXX The Duplicate Request Cache (DRC) has been checked (??)
845 * We get here on a DRC miss.
846 */
847
848 nfs4_lock_state();
21ab45a4
N		 849
850 conf = find_confirmed_client(clid);
851 unconf = find_unconfirmed_client(clid);
852
853 status = nfserr_clid_inuse;
854 if (conf && conf->cl_addr != ip_addr)
855 goto out;
856 if (unconf && unconf->cl_addr != ip_addr)
857 goto out;
858
1da177e4
LT		 859 if ((conf && unconf) &&
860 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
861 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 862 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 863 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 864 /* CASE 1:
865 * unconf record that matches input clientid and input confirm.
866 * conf record that matches input clientid.
867 * conf and unconf records match names, verifiers
868 */
1da177e4
LT		 869 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
870 status = nfserr_clid_inuse;
871 else {
1a69c179
N		 872 /* XXX: We just turn off callbacks until we can handle
873 * change request correctly. */
cb36d634 874 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 875 gen_confirm(conf);
46309029 876 nfsd4_remove_clid_dir(unconf);
1a69c179 877 expire_client(unconf);
1da177e4 878 status = nfs_ok;
1a69c179 879
1da177e4 880 }
7c79f737 881 } else if ((conf && !unconf) ||
1da177e4
LT		 882 ((conf && unconf) &&
883 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 884 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 885 /* CASE 2:
886 * conf record that matches input clientid.
887 * if unconf record matches input clientid, then
888 * unconf->cl_name or unconf->cl_verifier don't match the
889 * conf record.
890 */
21ab45a4 891 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 892 status = nfserr_clid_inuse;
21ab45a4 893 else
1da177e4 894 status = nfs_ok;
7c79f737
N		 895 } else if (!conf && unconf
896 && cmp_verf(&unconf->cl_confirm, &confirm)) {
897 /* CASE 3:
898 * conf record not found.
899 * unconf record found.
900 * unconf->cl_confirm matches input confirm
901 */
1da177e4
LT		 902 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
903 status = nfserr_clid_inuse;
904 } else {
1a69c179
N		 905 unsigned int hash =
906 clientstr_hashval(unconf->cl_recdir);
907 conf = find_confirmed_client_by_str(unconf->cl_recdir,
908 hash);
909 if (conf) {
c7b9a459 910 nfsd4_remove_clid_dir(conf);
1a69c179
N		 911 expire_client(conf);
912 }
1da177e4 913 move_to_confirmed(unconf);
21ab45a4 914 conf = unconf;
1a69c179 915 status = nfs_ok;
1da177e4 916 }
7c79f737
N		 917 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
918 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
919 &confirm)))) {
920 /* CASE 4:
921 * conf record not found, or if conf, conf->cl_confirm does not
922 * match input confirm.
923 * unconf record not found, or if unconf, unconf->cl_confirm
924 * does not match input confirm.
925 */
1da177e4 926 status = nfserr_stale_clientid;
7c79f737 927 } else {
08e8987c
N		 928 /* check that we have hit one of the cases...*/
929 status = nfserr_clid_inuse;
930 }
1da177e4
LT		 931out:
932 if (!status)
21ab45a4 933 nfsd4_probe_callback(conf);
1da177e4
LT		 934 nfs4_unlock_state();
935 return status;
936}
937
938/*
939 * Open owner state (share locks)
940 */
941
942/* hash tables for nfs4_stateowner */
943#define OWNER_HASH_BITS 8
944#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
945#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
946
947#define ownerid_hashval(id) \
948 ((id) & OWNER_HASH_MASK)
949#define ownerstr_hashval(clientid, ownername) \
950 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
951
952static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
953static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
954
955/* hash table for nfs4_file */
956#define FILE_HASH_BITS 8
957#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
958#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
959/* hash table for (open)nfs4_stateid */
960#define STATEID_HASH_BITS 10
961#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
962#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
963
964#define file_hashval(x) \
965 hash_ptr(x, FILE_HASH_BITS)
966#define stateid_hashval(owner_id, file_id) \
967 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
968
969static struct list_head file_hashtbl[FILE_HASH_SIZE];
970static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
971
972/* OPEN Share state helper functions */
973static inline struct nfs4_file *
974alloc_init_file(struct inode *ino)
975{
976 struct nfs4_file *fp;
977 unsigned int hashval = file_hashval(ino);
978
e60d4398
N		 979 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
980 if (fp) {
13cd2184 981 kref_init(&fp->fi_ref);
1da177e4 982 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 983 INIT_LIST_HEAD(&fp->fi_stateids);
984 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 985 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
986 fp->fi_inode = igrab(ino);
987 fp->fi_id = current_fileid++;
1da177e4
LT		 988 return fp;
989 }
990 return NULL;
991}
992
e60d4398
N		 993static void
994nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 995{
e60d4398
N		 996 int status;
997
998 if (*slab == NULL)
999 return;
1000 status = kmem_cache_destroy(*slab);
1001 *slab = NULL;
1002 WARN_ON(status);
1da177e4
LT		 1003}
1004
1005static void
1006nfsd4_free_slabs(void)
1007{
e60d4398
N		 1008 nfsd4_free_slab(&stateowner_slab);
1009 nfsd4_free_slab(&file_slab);
5ac049ac 1010 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1011 nfsd4_free_slab(&deleg_slab);
e60d4398 1012}
1da177e4 1013
e60d4398
N		 1014static int
1015nfsd4_init_slabs(void)
1016{
1017 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1018 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1019 if (stateowner_slab == NULL)
1020 goto out_nomem;
1021 file_slab = kmem_cache_create("nfsd4_files",
1022 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1023 if (file_slab == NULL)
1024 goto out_nomem;
5ac049ac
N		 1025 stateid_slab = kmem_cache_create("nfsd4_stateids",
1026 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1027 if (stateid_slab == NULL)
1028 goto out_nomem;
5b2d21c1
N		 1029 deleg_slab = kmem_cache_create("nfsd4_delegations",
1030 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1031 if (deleg_slab == NULL)
1032 goto out_nomem;
e60d4398
N		 1033 return 0;
1034out_nomem:
1035 nfsd4_free_slabs();
1036 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1037 return -ENOMEM;
1da177e4
LT		 1038}
1039
1040void
1041nfs4_free_stateowner(struct kref *kref)
1042{
1043 struct nfs4_stateowner *sop =
1044 container_of(kref, struct nfs4_stateowner, so_ref);
1045 kfree(sop->so_owner.data);
1046 kmem_cache_free(stateowner_slab, sop);
1047}
1048
1049static inline struct nfs4_stateowner *
1050alloc_stateowner(struct xdr_netobj *owner)
1051{
1052 struct nfs4_stateowner *sop;
1053
1054 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1055 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1056 memcpy(sop->so_owner.data, owner->data, owner->len);
1057 sop->so_owner.len = owner->len;
1058 kref_init(&sop->so_ref);
1059 return sop;
1060 }
1061 kmem_cache_free(stateowner_slab, sop);
1062 }
1063 return NULL;
1064}
1065
1066static struct nfs4_stateowner *
1067alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1068 struct nfs4_stateowner *sop;
1069 struct nfs4_replay *rp;
1070 unsigned int idhashval;
1071
1072 if (!(sop = alloc_stateowner(&open->op_owner)))
1073 return NULL;
1074 idhashval = ownerid_hashval(current_ownerid);
1075 INIT_LIST_HEAD(&sop->so_idhash);
1076 INIT_LIST_HEAD(&sop->so_strhash);
1077 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1078 INIT_LIST_HEAD(&sop->so_stateids);
1079 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1080 INIT_LIST_HEAD(&sop->so_close_lru);
1081 sop->so_time = 0;
1082 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1083 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1084 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1085 sop->so_is_open_owner = 1;
1086 sop->so_id = current_ownerid++;
1087 sop->so_client = clp;
1088 sop->so_seqid = open->op_seqid;
1089 sop->so_confirmed = 0;
1090 rp = &sop->so_replay;
1091 rp->rp_status = NFSERR_SERVERFAULT;
1092 rp->rp_buflen = 0;
1093 rp->rp_buf = rp->rp_ibuf;
1094 return sop;
1095}
1096
1097static void
1098release_stateid_lockowners(struct nfs4_stateid *open_stp)
1099{
1100 struct nfs4_stateowner *lock_sop;
1101
ea1da636
N		 1102 while (!list_empty(&open_stp->st_lockowners)) {
1103 lock_sop = list_entry(open_stp->st_lockowners.next,
1104 struct nfs4_stateowner, so_perstateid);
1105 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1106 BUG_ON(lock_sop->so_is_open_owner);
1107 release_stateowner(lock_sop);
1108 }
1109}
1110
1111static void
1112unhash_stateowner(struct nfs4_stateowner *sop)
1113{
1114 struct nfs4_stateid *stp;
1115
1116 list_del(&sop->so_idhash);
1117 list_del(&sop->so_strhash);
6fa305de 1118 if (sop->so_is_open_owner)
1da177e4 1119 list_del(&sop->so_perclient);
ea1da636
N		 1120 list_del(&sop->so_perstateid);
1121 while (!list_empty(&sop->so_stateids)) {
1122 stp = list_entry(sop->so_stateids.next,
1123 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1124 if (sop->so_is_open_owner)
1125 release_stateid(stp, OPEN_STATE);
1126 else
1127 release_stateid(stp, LOCK_STATE);
1128 }
1129}
1130
1131static void
1132release_stateowner(struct nfs4_stateowner *sop)
1133{
1134 unhash_stateowner(sop);
1135 list_del(&sop->so_close_lru);
1136 nfs4_put_stateowner(sop);
1137}
1138
1139static inline void
1140init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1141 struct nfs4_stateowner *sop = open->op_stateowner;
1142 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1143
1144 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1145 INIT_LIST_HEAD(&stp->st_perstateowner);
1146 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1147 INIT_LIST_HEAD(&stp->st_perfile);
1148 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1149 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1150 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1151 stp->st_stateowner = sop;
13cd2184 1152 get_nfs4_file(fp);
1da177e4
LT		 1153 stp->st_file = fp;
1154 stp->st_stateid.si_boot = boot_time;
1155 stp->st_stateid.si_stateownerid = sop->so_id;
1156 stp->st_stateid.si_fileid = fp->fi_id;
1157 stp->st_stateid.si_generation = 0;
1158 stp->st_access_bmap = 0;
1159 stp->st_deny_bmap = 0;
1160 __set_bit(open->op_share_access, &stp->st_access_bmap);
1161 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
4c4cd222 1162 stp->st_openstp = NULL;
1da177e4
LT		 1163}
1164
1165static void
1166release_stateid(struct nfs4_stateid *stp, int flags)
1167{
1168 struct file *filp = stp->st_vfs_file;
1169
1170 list_del(&stp->st_hash);
1da177e4 1171 list_del(&stp->st_perfile);
ea1da636 1172 list_del(&stp->st_perstateowner);
1da177e4
LT		 1173 if (flags & OPEN_STATE) {
1174 release_stateid_lockowners(stp);
1175 stp->st_vfs_file = NULL;
1176 nfsd_close(filp);
1da177e4
LT		 1177 } else if (flags & LOCK_STATE)
1178 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1179 put_nfs4_file(stp->st_file);
5ac049ac 1180 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1181 stp = NULL;
1182}
1183
fd39ca9a 1184static void
1da177e4
LT		 1185move_to_close_lru(struct nfs4_stateowner *sop)
1186{
1187 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1188
1189 unhash_stateowner(sop);
1190 list_add_tail(&sop->so_close_lru, &close_lru);
1191 sop->so_time = get_seconds();
1192}
1193
fd39ca9a 1194static void
1da177e4
LT		 1195release_state_owner(struct nfs4_stateid *stp, int flag)
1196{
1197 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1198
1199 dprintk("NFSD: release_state_owner\n");
1200 release_stateid(stp, flag);
1201
1202 /* place unused nfs4_stateowners on so_close_lru list to be
1203 * released by the laundromat service after the lease period
1204 * to enable us to handle CLOSE replay
1205 */
ea1da636 1206 if (sop->so_confirmed && list_empty(&sop->so_stateids))
1da177e4 1207 move_to_close_lru(sop);
1da177e4
LT		 1208}
1209
1210static int
1211cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1212 return ((sop->so_owner.len == owner->len) &&
1213 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1214 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1215}
1216
1217static struct nfs4_stateowner *
1218find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1219{
1220 struct nfs4_stateowner *so = NULL;
1221
1222 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1223 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1224 return so;
1225 }
1226 return NULL;
1227}
1228
1229/* search file_hashtbl[] for file */
1230static struct nfs4_file *
1231find_file(struct inode *ino)
1232{
1233 unsigned int hashval = file_hashval(ino);
1234 struct nfs4_file *fp;
1235
1236 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1237 if (fp->fi_inode == ino) {
1238 get_nfs4_file(fp);
1da177e4 1239 return fp;
13cd2184 1240 }
1da177e4
LT		 1241 }
1242 return NULL;
1243}
1244
1245#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1246#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1247
fd39ca9a 1248static void
1da177e4
LT		 1249set_access(unsigned int *access, unsigned long bmap) {
1250 int i;
1251
1252 *access = 0;
1253 for (i = 1; i < 4; i++) {
1254 if (test_bit(i, &bmap))
1255 *access |= i;
1256 }
1257}
1258
fd39ca9a 1259static void
1da177e4
LT		 1260set_deny(unsigned int *deny, unsigned long bmap) {
1261 int i;
1262
1263 *deny = 0;
1264 for (i = 0; i < 4; i++) {
1265 if (test_bit(i, &bmap))
1266 *deny |= i ;
1267 }
1268}
1269
1270static int
1271test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1272 unsigned int access, deny;
1273
1274 set_access(&access, stp->st_access_bmap);
1275 set_deny(&deny, stp->st_deny_bmap);
1276 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1277 return 0;
1278 return 1;
1279}
1280
1281/*
1282 * Called to check deny when READ with all zero stateid or
1283 * WRITE with all zero or all one stateid
1284 */
fd39ca9a 1285static int
1da177e4
LT		 1286nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1287{
1288 struct inode *ino = current_fh->fh_dentry->d_inode;
1289 struct nfs4_file *fp;
1290 struct nfs4_stateid *stp;
13cd2184 1291 int ret;
1da177e4
LT		 1292
1293 dprintk("NFSD: nfs4_share_conflict\n");
1294
1295 fp = find_file(ino);
13cd2184
N		 1296 if (!fp)
1297 return nfs_ok;
b700949b 1298 ret = nfserr_locked;
1da177e4 1299 /* Search for conflicting share reservations */
13cd2184
N		 1300 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1301 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1302 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1303 goto out;
1da177e4 1304 }
13cd2184
N		 1305 ret = nfs_ok;
1306out:
1307 put_nfs4_file(fp);
1308 return ret;
1da177e4
LT		 1309}
1310
1311static inline void
1312nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1313{
1314 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1315 put_write_access(filp->f_dentry->d_inode);
1316 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1317 }
1318}
1319
1320/*
1321 * Recall a delegation
1322 */
1323static int
1324do_recall(void *__dp)
1325{
1326 struct nfs4_delegation *dp = __dp;
1327
1328 daemonize("nfsv4-recall");
1329
1330 nfsd4_cb_recall(dp);
1331 return 0;
1332}
1333
1334/*
1335 * Spawn a thread to perform a recall on the delegation represented
1336 * by the lease (file_lock)
1337 *
1338 * Called from break_lease() with lock_kernel() held.
1339 * Note: we assume break_lease will only call this *once* for any given
1340 * lease.
1341 */
1342static
1343void nfsd_break_deleg_cb(struct file_lock *fl)
1344{
1345 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1346 struct task_struct *t;
1347
1348 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1349 if (!dp)
1350 return;
1351
1352 /* We're assuming the state code never drops its reference
1353 * without first removing the lease. Since we're in this lease
1354 * callback (and since the lease code is serialized by the kernel
1355 * lock) we know the server hasn't removed the lease yet, we know
1356 * it's safe to take a reference: */
1357 atomic_inc(&dp->dl_count);
1358
1359 spin_lock(&recall_lock);
1360 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1361 spin_unlock(&recall_lock);
1362
1363 /* only place dl_time is set. protected by lock_kernel*/
1364 dp->dl_time = get_seconds();
1365
1366 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1367 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1368
1369 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1370 if (IS_ERR(t)) {
1371 struct nfs4_client *clp = dp->dl_client;
1372
1373 printk(KERN_INFO "NFSD: Callback thread failed for "
1374 "for client (clientid %08x/%08x)\n",
1375 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1376 nfs4_put_delegation(dp);
1377 }
1378}
1379
1380/*
1381 * The file_lock is being reapd.
1382 *
1383 * Called by locks_free_lock() with lock_kernel() held.
1384 */
1385static
1386void nfsd_release_deleg_cb(struct file_lock *fl)
1387{
1388 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1389
1390 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1391
1392 if (!(fl->fl_flags & FL_LEASE) || !dp)
1393 return;
1394 dp->dl_flock = NULL;
1395}
1396
1397/*
1398 * Set the delegation file_lock back pointer.
1399 *
1400 * Called from __setlease() with lock_kernel() held.
1401 */
1402static
1403void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1404{
1405 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1406
1407 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1408 if (!dp)
1409 return;
1410 dp->dl_flock = new;
1411}
1412
1413/*
1414 * Called from __setlease() with lock_kernel() held
1415 */
1416static
1417int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1418{
1419 struct nfs4_delegation *onlistd =
1420 (struct nfs4_delegation *)onlist->fl_owner;
1421 struct nfs4_delegation *tryd =
1422 (struct nfs4_delegation *)try->fl_owner;
1423
1424 if (onlist->fl_lmops != try->fl_lmops)
1425 return 0;
1426
1427 return onlistd->dl_client == tryd->dl_client;
1428}
1429
1430
1431static
1432int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1433{
1434 if (arg & F_UNLCK)
1435 return lease_modify(onlist, arg);
1436 else
1437 return -EAGAIN;
1438}
1439
fd39ca9a 1440static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1441 .fl_break = nfsd_break_deleg_cb,
1442 .fl_release_private = nfsd_release_deleg_cb,
1443 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1444 .fl_mylease = nfsd_same_client_deleg_cb,
1445 .fl_change = nfsd_change_deleg_cb,
1446};
1447
1448
1449/*
1450 * nfsd4_process_open1()
1451 * lookup stateowner.
1452 * found:
1453 * check confirmed
1454 * confirmed:
1455 * check seqid
1456 * not confirmed:
1457 * delete owner
1458 * create new owner
1459 * notfound:
1460 * verify clientid
1461 * create new owner
1462 *
1463 * called with nfs4_lock_state() held.
1464 */
1465int
1466nfsd4_process_open1(struct nfsd4_open *open)
1467{
1468 int status;
1469 clientid_t *clientid = &open->op_clientid;
1470 struct nfs4_client *clp = NULL;
1471 unsigned int strhashval;
1472 struct nfs4_stateowner *sop = NULL;
1473
1474 status = nfserr_inval;
1475 if (!check_name(open->op_owner))
1476 goto out;
1477
1478 if (STALE_CLIENTID(&open->op_clientid))
1479 return nfserr_stale_clientid;
1480
1481 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1482 sop = find_openstateowner_str(strhashval, open);
1483 if (sop) {
1484 open->op_stateowner = sop;
1485 /* check for replay */
bd9aac52 1486 if (open->op_seqid == sop->so_seqid - 1){
1da177e4
LT		 1487 if (sop->so_replay.rp_buflen)
1488 return NFSERR_REPLAY_ME;
1489 else {
1490 /* The original OPEN failed so spectacularly
1491 * that we don't even have replay data saved!
1492 * Therefore, we have no choice but to continue
1493 * processing this OPEN; presumably, we'll
1494 * fail again for the same reason.
1495 */
1496 dprintk("nfsd4_process_open1:"
1497 " replay with no replay cache\n");
1498 goto renew;
1499 }
1500 } else if (sop->so_confirmed) {
bd9aac52 1501 if (open->op_seqid == sop->so_seqid)
1da177e4
LT		 1502 goto renew;
1503 status = nfserr_bad_seqid;
1504 goto out;
1505 } else {
1506 /* If we get here, we received an OPEN for an
1507 * unconfirmed nfs4_stateowner. Since the seqid's are
1508 * different, purge the existing nfs4_stateowner, and
1509 * instantiate a new one.
1510 */
1511 clp = sop->so_client;
1512 release_stateowner(sop);
1513 }
1514 } else {
1515 /* nfs4_stateowner not found.
1516 * Verify clientid and instantiate new nfs4_stateowner.
1517 * If verify fails this is presumably the result of the
1518 * client's lease expiring.
1519 */
1520 status = nfserr_expired;
1521 clp = find_confirmed_client(clientid);
1522 if (clp == NULL)
1523 goto out;
1524 }
1525 status = nfserr_resource;
1526 sop = alloc_init_open_stateowner(strhashval, clp, open);
1527 if (sop == NULL)
1528 goto out;
1529 open->op_stateowner = sop;
1530renew:
1531 status = nfs_ok;
1532 renew_client(sop->so_client);
1533out:
1da177e4
LT		 1534 return status;
1535}
1536
4a6e43e6
N		 1537static inline int
1538nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1539{
1540 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1541 return nfserr_openmode;
1542 else
1543 return nfs_ok;
1544}
1545
52f4fb43
N		 1546static struct nfs4_delegation *
1547find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1548{
1549 struct nfs4_delegation *dp;
1550
ea1da636 1551 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1552 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1553 return dp;
1554 }
1555 return NULL;
1556}
1557
c44c5eeb 1558static int
567d9829
N		 1559nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1560 struct nfs4_delegation **dp)
1561{
1562 int flags;
c44c5eeb 1563 int status = nfserr_bad_stateid;
567d9829
N		 1564
1565 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1566 if (*dp == NULL)
c44c5eeb 1567 goto out;
567d9829
N		 1568 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1569 RD_STATE : WR_STATE;
1570 status = nfs4_check_delegmode(*dp, flags);
1571 if (status)
1572 *dp = NULL;
c44c5eeb
N		 1573out:
1574 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1575 return nfs_ok;
1576 if (status)
1577 return status;
1578 open->op_stateowner->so_confirmed = 1;
1579 return nfs_ok;
567d9829
N		 1580}
1581
1da177e4
LT		 1582static int
1583nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1584{
1585 struct nfs4_stateid *local;
1586 int status = nfserr_share_denied;
1587 struct nfs4_stateowner *sop = open->op_stateowner;
1588
8beefa24 1589 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1590 /* ignore lock owners */
1591 if (local->st_stateowner->so_is_open_owner == 0)
1592 continue;
1593 /* remember if we have seen this open owner */
1594 if (local->st_stateowner == sop)
1595 *stpp = local;
1596 /* check for conflicting share reservations */
1597 if (!test_share(local, open))
1598 goto out;
1599 }
1600 status = 0;
1601out:
1602 return status;
1603}
1604
5ac049ac
N		 1605static inline struct nfs4_stateid *
1606nfs4_alloc_stateid(void)
1607{
1608 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1609}
1610
1da177e4
LT		 1611static int
1612nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1613 struct nfs4_delegation *dp,
1da177e4
LT		 1614 struct svc_fh *cur_fh, int flags)
1615{
1616 struct nfs4_stateid *stp;
1da177e4 1617
5ac049ac 1618 stp = nfs4_alloc_stateid();
1da177e4
LT		 1619 if (stp == NULL)
1620 return nfserr_resource;
1621
567d9829
N		 1622 if (dp) {
1623 get_file(dp->dl_vfs_file);
1624 stp->st_vfs_file = dp->dl_vfs_file;
1625 } else {
1626 int status;
1627 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1628 &stp->st_vfs_file);
1629 if (status) {
1630 if (status == nfserr_dropit)
1631 status = nfserr_jukebox;
5ac049ac 1632 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1633 return status;
1634 }
1da177e4 1635 }
1da177e4
LT		 1636 *stpp = stp;
1637 return 0;
1638}
1639
1640static inline int
1641nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1642 struct nfsd4_open *open)
1643{
1644 struct iattr iattr = {
1645 .ia_valid = ATTR_SIZE,
1646 .ia_size = 0,
1647 };
1648 if (!open->op_truncate)
1649 return 0;
1650 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1651 return -EINVAL;
1652 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1653}
1654
1655static int
1656nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1657{
1658 struct file *filp = stp->st_vfs_file;
1659 struct inode *inode = filp->f_dentry->d_inode;
1660 unsigned int share_access;
1661 int status;
1662
1663 set_access(&share_access, stp->st_access_bmap);
1664 share_access = ~share_access;
1665 share_access &= open->op_share_access;
1666
1667 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1668 return nfsd4_truncate(rqstp, cur_fh, open);
1669
1670 status = get_write_access(inode);
1671 if (status)
1672 return nfserrno(status);
1673 status = nfsd4_truncate(rqstp, cur_fh, open);
1674 if (status) {
1675 put_write_access(inode);
1676 return status;
1677 }
1678 /* remember the open */
1679 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1680 set_bit(open->op_share_access, &stp->st_access_bmap);
1681 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1682
1683 return nfs_ok;
1684}
1685
1686
1da177e4 1687static void
37515177 1688nfs4_set_claim_prev(struct nfsd4_open *open)
1da177e4 1689{
37515177
N		 1690 open->op_stateowner->so_confirmed = 1;
1691 open->op_stateowner->so_client->cl_firststate = 1;
1da177e4
LT		 1692}
1693
1694/*
1695 * Attempt to hand out a delegation.
1696 */
1697static void
1698nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1699{
1700 struct nfs4_delegation *dp;
1701 struct nfs4_stateowner *sop = stp->st_stateowner;
1702 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1703 struct file_lock fl, *flp = &fl;
1704 int status, flag = 0;
1705
1706 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1707 open->op_recall = 0;
1708 switch (open->op_claim_type) {
1709 case NFS4_OPEN_CLAIM_PREVIOUS:
1710 if (!atomic_read(&cb->cb_set))
1711 open->op_recall = 1;
1712 flag = open->op_delegate_type;
1713 if (flag == NFS4_OPEN_DELEGATE_NONE)
1714 goto out;
1715 break;
1716 case NFS4_OPEN_CLAIM_NULL:
1717 /* Let's not give out any delegations till everyone's
1718 * had the chance to reclaim theirs.... */
1719 if (nfs4_in_grace())
1720 goto out;
1721 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1722 goto out;
1723 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1724 flag = NFS4_OPEN_DELEGATE_WRITE;
1725 else
1726 flag = NFS4_OPEN_DELEGATE_READ;
1727 break;
1728 default:
1729 goto out;
1730 }
1da177e4
LT		 1731
1732 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1733 if (dp == NULL) {
1734 flag = NFS4_OPEN_DELEGATE_NONE;
1735 goto out;
1736 }
1737 locks_init_lock(&fl);
1738 fl.fl_lmops = &nfsd_lease_mng_ops;
1739 fl.fl_flags = FL_LEASE;
1740 fl.fl_end = OFFSET_MAX;
1741 fl.fl_owner = (fl_owner_t)dp;
1742 fl.fl_file = stp->st_vfs_file;
1743 fl.fl_pid = current->tgid;
1744
1745 /* setlease checks to see if delegation should be handed out.
1746 * the lock_manager callbacks fl_mylease and fl_change are used
1747 */
1748 if ((status = setlease(stp->st_vfs_file,
1749 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1750 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1751 unhash_delegation(dp);
1da177e4
LT		 1752 flag = NFS4_OPEN_DELEGATE_NONE;
1753 goto out;
1754 }
1755
1756 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1757
1758 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1759 dp->dl_stateid.si_boot,
1760 dp->dl_stateid.si_stateownerid,
1761 dp->dl_stateid.si_fileid,
1762 dp->dl_stateid.si_generation);
1763out:
7b190fec
N		 1764 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1765 && flag == NFS4_OPEN_DELEGATE_NONE
1766 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1767 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1768 open->op_delegate_type = flag;
1769}
1770
1771/*
1772 * called with nfs4_lock_state() held.
1773 */
1774int
1775nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1776{
1777 struct nfs4_file *fp = NULL;
1778 struct inode *ino = current_fh->fh_dentry->d_inode;
1779 struct nfs4_stateid *stp = NULL;
567d9829 1780 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1781 int status;
1782
b648330a
N		 1783 if (nfs4_in_grace() && open->op_claim_type != NFS4_OPEN_CLAIM_PREVIOUS)
1784 return nfserr_grace;
1785
1786 if (!nfs4_in_grace() && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1787 return nfserr_no_grace;
1788
1da177e4
LT		 1789 status = nfserr_inval;
1790 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1791 goto out;
1792 /*
1793 * Lookup file; if found, lookup stateid and check open request,
1794 * and check for delegations in the process of being recalled.
1795 * If not found, create the nfs4_file struct
1796 */
1797 fp = find_file(ino);
1798 if (fp) {
1799 if ((status = nfs4_check_open(fp, open, &stp)))
1800 goto out;
c44c5eeb
N		 1801 status = nfs4_check_deleg(fp, open, &dp);
1802 if (status)
1803 goto out;
1da177e4 1804 } else {
c44c5eeb
N		 1805 status = nfserr_bad_stateid;
1806 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1807 goto out;
1da177e4
LT		 1808 status = nfserr_resource;
1809 fp = alloc_init_file(ino);
1810 if (fp == NULL)
1811 goto out;
1812 }
1813
1814 /*
1815 * OPEN the file, or upgrade an existing OPEN.
1816 * If truncate fails, the OPEN fails.
1817 */
1818 if (stp) {
1819 /* Stateid was found, this is an OPEN upgrade */
1820 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1821 if (status)
1822 goto out;
444c2c07 1823 update_stateid(&stp->st_stateid);
1da177e4
LT		 1824 } else {
1825 /* Stateid was not found, this is a new OPEN */
1826 int flags = 0;
1827 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1828 flags = MAY_WRITE;
1829 else
1830 flags = MAY_READ;
567d9829
N		 1831 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1832 if (status)
1da177e4
LT		 1833 goto out;
1834 init_stateid(stp, fp, open);
1835 status = nfsd4_truncate(rqstp, current_fh, open);
1836 if (status) {
1837 release_stateid(stp, OPEN_STATE);
1838 goto out;
1839 }
1840 }
1841 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1842
1843 /*
1844 * Attempt to hand out a delegation. No error return, because the
1845 * OPEN succeeds even if we fail.
1846 */
1847 nfs4_open_delegation(current_fh, open, stp);
1848
1849 status = nfs_ok;
1850
1851 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1852 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1853 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1854out:
13cd2184
N		 1855 if (fp)
1856 put_nfs4_file(fp);
37515177
N		 1857 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1858 nfs4_set_claim_prev(open);
1da177e4
LT		 1859 /*
1860 * To finish the open response, we just need to set the rflags.
1861 */
1862 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1863 if (!open->op_stateowner->so_confirmed)
1864 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1865
1866 return status;
1867}
1868
58da282b 1869static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1870static struct work_struct laundromat_work;
1871static void laundromat_main(void *);
1872static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1873
1874int
1875nfsd4_renew(clientid_t *clid)
1876{
1877 struct nfs4_client *clp;
1878 int status;
1879
1880 nfs4_lock_state();
1881 dprintk("process_renew(%08x/%08x): starting\n",
1882 clid->cl_boot, clid->cl_id);
1883 status = nfserr_stale_clientid;
1884 if (STALE_CLIENTID(clid))
1885 goto out;
1886 clp = find_confirmed_client(clid);
1887 status = nfserr_expired;
1888 if (clp == NULL) {
1889 /* We assume the client took too long to RENEW. */
1890 dprintk("nfsd4_renew: clientid not found!\n");
1891 goto out;
1892 }
1893 renew_client(clp);
1894 status = nfserr_cb_path_down;
ea1da636 1895 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1896 && !atomic_read(&clp->cl_callback.cb_set))
1897 goto out;
1898 status = nfs_ok;
1899out:
1900 nfs4_unlock_state();
1901 return status;
1902}
1903
a76b4319
N		 1904static void
1905end_grace(void)
1906{
1907 dprintk("NFSD: end of grace period\n");
c7b9a459 1908 nfsd4_recdir_purge_old();
a76b4319
N		 1909 in_grace = 0;
1910}
1911
fd39ca9a 1912static time_t
1da177e4
LT		 1913nfs4_laundromat(void)
1914{
1915 struct nfs4_client *clp;
1916 struct nfs4_stateowner *sop;
1917 struct nfs4_delegation *dp;
1918 struct list_head *pos, *next, reaplist;
1919 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1920 time_t t, clientid_val = NFSD_LEASE_TIME;
1921 time_t u, test_val = NFSD_LEASE_TIME;
1922
1923 nfs4_lock_state();
1924
1925 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1926 if (in_grace)
1927 end_grace();
1da177e4
LT		 1928 list_for_each_safe(pos, next, &client_lru) {
1929 clp = list_entry(pos, struct nfs4_client, cl_lru);
1930 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1931 t = clp->cl_time - cutoff;
1932 if (clientid_val > t)
1933 clientid_val = t;
1934 break;
1935 }
1936 dprintk("NFSD: purging unused client (clientid %08x)\n",
1937 clp->cl_clientid.cl_id);
c7b9a459 1938 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1939 expire_client(clp);
1940 }
1941 INIT_LIST_HEAD(&reaplist);
1942 spin_lock(&recall_lock);
1943 list_for_each_safe(pos, next, &del_recall_lru) {
1944 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1945 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1946 u = dp->dl_time - cutoff;
1947 if (test_val > u)
1948 test_val = u;
1949 break;
1950 }
1951 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1952 dp, dp->dl_flock);
1953 list_move(&dp->dl_recall_lru, &reaplist);
1954 }
1955 spin_unlock(&recall_lock);
1956 list_for_each_safe(pos, next, &reaplist) {
1957 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1958 list_del_init(&dp->dl_recall_lru);
1959 unhash_delegation(dp);
1960 }
1961 test_val = NFSD_LEASE_TIME;
1962 list_for_each_safe(pos, next, &close_lru) {
1963 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1964 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1965 u = sop->so_time - cutoff;
1966 if (test_val > u)
1967 test_val = u;
1968 break;
1969 }
1970 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1971 sop->so_id);
1972 list_del(&sop->so_close_lru);
1973 nfs4_put_stateowner(sop);
1974 }
1975 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1976 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1977 nfs4_unlock_state();
1978 return clientid_val;
1979}
1980
1981void
1982laundromat_main(void *not_used)
1983{
1984 time_t t;
1985
1986 t = nfs4_laundromat();
1987 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1988 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1989}
1990
fd39ca9a 1991static struct nfs4_stateowner *
f8816512
N		 1992search_close_lru(u32 st_id, int flags)
1993{
1da177e4
LT		 1994 struct nfs4_stateowner *local = NULL;
1995
1da177e4
LT		 1996 if (flags & CLOSE_STATE) {
1997 list_for_each_entry(local, &close_lru, so_close_lru) {
1998 if (local->so_id == st_id)
1999 return local;
2000 }
2001 }
2002 return NULL;
2003}
2004
2005static inline int
2006nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2007{
2008 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2009}
2010
2011static int
2012STALE_STATEID(stateid_t *stateid)
2013{
2014 if (stateid->si_boot == boot_time)
2015 return 0;
849823c5 2016 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1da177e4
LT		 2017 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2018 stateid->si_generation);
2019 return 1;
2020}
2021
2022static inline int
2023access_permit_read(unsigned long access_bmap)
2024{
2025 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2026 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2027 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2028}
2029
2030static inline int
2031access_permit_write(unsigned long access_bmap)
2032{
2033 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2034 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2035}
2036
2037static
2038int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2039{
2040 int status = nfserr_openmode;
2041
2042 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2043 goto out;
2044 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2045 goto out;
2046 status = nfs_ok;
2047out:
2048 return status;
2049}
2050
1da177e4
LT		 2051static inline int
2052check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2053{
2054 /* Trying to call delegreturn with a special stateid? Yuch: */
2055 if (!(flags & (RD_STATE | WR_STATE)))
2056 return nfserr_bad_stateid;
2057 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2058 return nfs_ok;
2059 else if (nfs4_in_grace()) {
2060 /* Answer in remaining cases depends on existance of
2061 * conflicting state; so we must wait out the grace period. */
2062 return nfserr_grace;
2063 } else if (flags & WR_STATE)
2064 return nfs4_share_conflict(current_fh,
2065 NFS4_SHARE_DENY_WRITE);
2066 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2067 return nfs4_share_conflict(current_fh,
2068 NFS4_SHARE_DENY_READ);
2069}
2070
2071/*
2072 * Allow READ/WRITE during grace period on recovered state only for files
2073 * that are not able to provide mandatory locking.
2074 */
2075static inline int
2076io_during_grace_disallowed(struct inode *inode, int flags)
2077{
2078 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2079 && MANDATORY_LOCK(inode);
2080}
2081
2082/*
2083* Checks for stateid operations
2084*/
2085int
2086nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2087{
2088 struct nfs4_stateid *stp = NULL;
2089 struct nfs4_delegation *dp = NULL;
2090 stateid_t *stidp;
2091 struct inode *ino = current_fh->fh_dentry->d_inode;
2092 int status;
2093
2094 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2095 stateid->si_boot, stateid->si_stateownerid,
2096 stateid->si_fileid, stateid->si_generation);
2097 if (filpp)
2098 *filpp = NULL;
2099
2100 if (io_during_grace_disallowed(ino, flags))
2101 return nfserr_grace;
2102
2103 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2104 return check_special_stateids(current_fh, stateid, flags);
2105
2106 /* STALE STATEID */
2107 status = nfserr_stale_stateid;
2108 if (STALE_STATEID(stateid))
2109 goto out;
2110
2111 /* BAD STATEID */
2112 status = nfserr_bad_stateid;
2113 if (!stateid->si_fileid) { /* delegation stateid */
2114 if(!(dp = find_delegation_stateid(ino, stateid))) {
2115 dprintk("NFSD: delegation stateid not found\n");
2116 if (nfs4_in_grace())
2117 status = nfserr_grace;
2118 goto out;
2119 }
2120 stidp = &dp->dl_stateid;
2121 } else { /* open or lock stateid */
2122 if (!(stp = find_stateid(stateid, flags))) {
2123 dprintk("NFSD: open or lock stateid not found\n");
2124 if (nfs4_in_grace())
2125 status = nfserr_grace;
2126 goto out;
2127 }
2128 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2129 goto out;
2130 if (!stp->st_stateowner->so_confirmed)
2131 goto out;
2132 stidp = &stp->st_stateid;
2133 }
2134 if (stateid->si_generation > stidp->si_generation)
2135 goto out;
2136
2137 /* OLD STATEID */
2138 status = nfserr_old_stateid;
2139 if (stateid->si_generation < stidp->si_generation)
2140 goto out;
2141 if (stp) {
2142 if ((status = nfs4_check_openmode(stp,flags)))
2143 goto out;
2144 renew_client(stp->st_stateowner->so_client);
2145 if (filpp)
2146 *filpp = stp->st_vfs_file;
2147 } else if (dp) {
2148 if ((status = nfs4_check_delegmode(dp, flags)))
2149 goto out;
2150 renew_client(dp->dl_client);
2151 if (flags & DELEG_RET)
2152 unhash_delegation(dp);
2153 if (filpp)
2154 *filpp = dp->dl_vfs_file;
2155 }
2156 status = nfs_ok;
2157out:
2158 return status;
2159}
2160
4c4cd222
N		 2161static inline int
2162setlkflg (int type)
2163{
2164 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2165 RD_STATE : WR_STATE;
2166}
1da177e4
LT		 2167
2168/*
2169 * Checks for sequence id mutating operations.
2170 */
fd39ca9a 2171static int
4c4cd222 2172nfs4_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 2173{
1da177e4
LT		 2174 struct nfs4_stateid *stp;
2175 struct nfs4_stateowner *sop;
2176
2177 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2178 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2179 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2180 stateid->si_generation);
3a4f98bb 2181
1da177e4
LT		 2182 *stpp = NULL;
2183 *sopp = NULL;
2184
1da177e4
LT		 2185 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2186 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
3a4f98bb 2187 return nfserr_bad_stateid;
1da177e4
LT		 2188 }
2189
1da177e4 2190 if (STALE_STATEID(stateid))
3a4f98bb 2191 return nfserr_stale_stateid;
1da177e4
LT		 2192 /*
2193 * We return BAD_STATEID if filehandle doesn't match stateid,
2194 * the confirmed flag is incorrecly set, or the generation
2195 * number is incorrect.
1da177e4 2196 */
f8816512
N		 2197 stp = find_stateid(stateid, flags);
2198 if (stp == NULL) {
2199 /*
2200 * Also, we should make sure this isn't just the result of
2201 * a replayed close:
2202 */
2203 sop = search_close_lru(stateid->si_stateownerid, flags);
2204 if (sop == NULL)
2205 return nfserr_bad_stateid;
2206 *sopp = sop;
2207 goto check_replay;
2208 }
1da177e4 2209
4c4cd222 2210 if (lock) {
1da177e4 2211 struct nfs4_stateowner *sop = stp->st_stateowner;
4c4cd222 2212 clientid_t *lockclid = &lock->v.new.clientid;
1da177e4 2213 struct nfs4_client *clp = sop->so_client;
4c4cd222
N		 2214 int lkflg = 0;
2215 int status;
2216
2217 lkflg = setlkflg(lock->lk_type);
2218
2219 if (lock->lk_is_new) {
2220 if (!sop->so_is_open_owner)
2221 return nfserr_bad_stateid;
2222 if (!cmp_clid(&clp->cl_clientid, lockclid))
2223 return nfserr_bad_stateid;
2224 /* stp is the open stateid */
2225 status = nfs4_check_openmode(stp, lkflg);
2226 if (status)
2227 return status;
2228 } else {
2229 /* stp is the lock stateid */
2230 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2231 if (status)
2232 return status;
2233 }
1da177e4 2234
1da177e4
LT		 2235 }
2236
2237 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2238 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3a4f98bb 2239 return nfserr_bad_stateid;
1da177e4
LT		 2240 }
2241
2242 *stpp = stp;
2243 *sopp = sop = stp->st_stateowner;
2244
2245 /*
2246 * We now validate the seqid and stateid generation numbers.
2247 * For the moment, we ignore the possibility of
2248 * generation number wraparound.
2249 */
bd9aac52 2250 if (seqid != sop->so_seqid)
1da177e4
LT		 2251 goto check_replay;
2252
3a4f98bb
N		 2253 if (sop->so_confirmed && flags & CONFIRM) {
2254 printk("NFSD: preprocess_seqid_op: expected"
2255 " unconfirmed stateowner!\n");
2256 return nfserr_bad_stateid;
1da177e4 2257 }
3a4f98bb
N		 2258 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2259 printk("NFSD: preprocess_seqid_op: stateowner not"
2260 " confirmed yet!\n");
2261 return nfserr_bad_stateid;
1da177e4
LT		 2262 }
2263 if (stateid->si_generation > stp->st_stateid.si_generation) {
2264 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
3a4f98bb 2265 return nfserr_bad_stateid;
1da177e4
LT		 2266 }
2267
1da177e4
LT		 2268 if (stateid->si_generation < stp->st_stateid.si_generation) {
2269 printk("NFSD: preprocess_seqid_op: old stateid!\n");
3a4f98bb 2270 return nfserr_old_stateid;
1da177e4 2271 }
52fd004e 2272 renew_client(sop->so_client);
3a4f98bb 2273 return nfs_ok;
1da177e4 2274
1da177e4 2275check_replay:
bd9aac52 2276 if (seqid == sop->so_seqid - 1) {
849823c5 2277 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
1da177e4 2278 /* indicate replay to calling function */
3a4f98bb 2279 return NFSERR_REPLAY_ME;
1da177e4 2280 }
3a4f98bb
N		 2281 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2282 sop->so_seqid, seqid);
2283 *sopp = NULL;
2284 return nfserr_bad_seqid;
1da177e4
LT		 2285}
2286
2287int
f2327d9a 2288nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc, struct nfs4_stateowner **replay_owner)
1da177e4
LT		 2289{
2290 int status;
2291 struct nfs4_stateowner *sop;
2292 struct nfs4_stateid *stp;
2293
2294 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2295 (int)current_fh->fh_dentry->d_name.len,
2296 current_fh->fh_dentry->d_name.name);
2297
2298 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2299 goto out;
2300
2301 nfs4_lock_state();
2302
2303 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2304 &oc->oc_req_stateid,
2305 CHECK_FH | CONFIRM | OPEN_STATE,
2306 &oc->oc_stateowner, &stp, NULL)))
2307 goto out;
2308
2309 sop = oc->oc_stateowner;
2310 sop->so_confirmed = 1;
2311 update_stateid(&stp->st_stateid);
2312 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2313 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2314 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2315 stp->st_stateid.si_boot,
2316 stp->st_stateid.si_stateownerid,
2317 stp->st_stateid.si_fileid,
2318 stp->st_stateid.si_generation);
c7b9a459
N		 2319
2320 nfsd4_create_clid_dir(sop->so_client);
1da177e4 2321out:
f2327d9a 2322 if (oc->oc_stateowner) {
1da177e4 2323 nfs4_get_stateowner(oc->oc_stateowner);
f2327d9a
NB		 2324 *replay_owner = oc->oc_stateowner;
2325 }
1da177e4
LT		 2326 nfs4_unlock_state();
2327 return status;
2328}
2329
2330
2331/*
2332 * unset all bits in union bitmap (bmap) that
2333 * do not exist in share (from successful OPEN_DOWNGRADE)
2334 */
2335static void
2336reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2337{
2338 int i;
2339 for (i = 1; i < 4; i++) {
2340 if ((i & access) != i)
2341 __clear_bit(i, bmap);
2342 }
2343}
2344
2345static void
2346reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2347{
2348 int i;
2349 for (i = 0; i < 4; i++) {
2350 if ((i & deny) != i)
2351 __clear_bit(i, bmap);
2352 }
2353}
2354
2355int
f2327d9a 2356nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od, struct nfs4_stateowner **replay_owner)
1da177e4
LT		 2357{
2358 int status;
2359 struct nfs4_stateid *stp;
2360 unsigned int share_access;
2361
2362 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2363 (int)current_fh->fh_dentry->d_name.len,
2364 current_fh->fh_dentry->d_name.name);
2365
2366 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2367 return nfserr_inval;
2368
2369 nfs4_lock_state();
2370 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2371 &od->od_stateid,
2372 CHECK_FH | OPEN_STATE,
2373 &od->od_stateowner, &stp, NULL)))
2374 goto out;
2375
2376 status = nfserr_inval;
2377 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2378 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2379 stp->st_access_bmap, od->od_share_access);
2380 goto out;
2381 }
2382 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2383 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2384 stp->st_deny_bmap, od->od_share_deny);
2385 goto out;
2386 }
2387 set_access(&share_access, stp->st_access_bmap);
2388 nfs4_file_downgrade(stp->st_vfs_file,
2389 share_access & ~od->od_share_access);
2390
2391 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2392 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2393
2394 update_stateid(&stp->st_stateid);
2395 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2396 status = nfs_ok;
2397out:
f2327d9a 2398 if (od->od_stateowner) {
1da177e4 2399 nfs4_get_stateowner(od->od_stateowner);
f2327d9a
NB		 2400 *replay_owner = od->od_stateowner;
2401 }
1da177e4
LT		 2402 nfs4_unlock_state();
2403 return status;
2404}
2405
2406/*
2407 * nfs4_unlock_state() called after encode
2408 */
2409int
f2327d9a 2410nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close, struct nfs4_stateowner **replay_owner)
1da177e4
LT		 2411{
2412 int status;
2413 struct nfs4_stateid *stp;
2414
2415 dprintk("NFSD: nfsd4_close on file %.*s\n",
2416 (int)current_fh->fh_dentry->d_name.len,
2417 current_fh->fh_dentry->d_name.name);
2418
2419 nfs4_lock_state();
2420 /* check close_lru for replay */
2421 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2422 &close->cl_stateid,
2423 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2424 &close->cl_stateowner, &stp, NULL)))
2425 goto out;
2426 /*
2427 * Return success, but first update the stateid.
2428 */
2429 status = nfs_ok;
2430 update_stateid(&stp->st_stateid);
2431 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2432
2433 /* release_state_owner() calls nfsd_close() if needed */
2434 release_state_owner(stp, OPEN_STATE);
2435out:
f2327d9a 2436 if (close->cl_stateowner) {
1da177e4 2437 nfs4_get_stateowner(close->cl_stateowner);
f2327d9a
NB		 2438 *replay_owner = close->cl_stateowner;
2439 }
1da177e4
LT		 2440 nfs4_unlock_state();
2441 return status;
2442}
2443
2444int
2445nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2446{
2447 int status;
2448
2449 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2450 goto out;
2451
2452 nfs4_lock_state();
2453 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2454 nfs4_unlock_state();
2455out:
2456 return status;
2457}
2458
2459
2460/*
2461 * Lock owner state (byte-range locks)
2462 */
2463#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2464#define LOCK_HASH_BITS 8
2465#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2466#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2467
2468#define lockownerid_hashval(id) \
2469 ((id) & LOCK_HASH_MASK)
2470
2471static inline unsigned int
2472lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2473 struct xdr_netobj *ownername)
2474{
2475 return (file_hashval(inode) + cl_id
2476 + opaque_hashval(ownername->data, ownername->len))
2477 & LOCK_HASH_MASK;
2478}
2479
2480static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2481static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2482static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2483
fd39ca9a 2484static struct nfs4_stateid *
1da177e4
LT		 2485find_stateid(stateid_t *stid, int flags)
2486{
2487 struct nfs4_stateid *local = NULL;
2488 u32 st_id = stid->si_stateownerid;
2489 u32 f_id = stid->si_fileid;
2490 unsigned int hashval;
2491
2492 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2493 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2494 hashval = stateid_hashval(st_id, f_id);
2495 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2496 if ((local->st_stateid.si_stateownerid == st_id) &&
2497 (local->st_stateid.si_fileid == f_id))
2498 return local;
2499 }
2500 }
2501 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2502 hashval = stateid_hashval(st_id, f_id);
2503 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2504 if ((local->st_stateid.si_stateownerid == st_id) &&
2505 (local->st_stateid.si_fileid == f_id))
2506 return local;
2507 }
849823c5 2508 }
1da177e4
LT		 2509 return NULL;
2510}
2511
2512static struct nfs4_delegation *
2513find_delegation_stateid(struct inode *ino, stateid_t *stid)
2514{
13cd2184
N		 2515 struct nfs4_file *fp;
2516 struct nfs4_delegation *dl;
1da177e4
LT		 2517
2518 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2519 stid->si_boot, stid->si_stateownerid,
2520 stid->si_fileid, stid->si_generation);
2521
1da177e4 2522 fp = find_file(ino);
13cd2184
N		 2523 if (!fp)
2524 return NULL;
2525 dl = find_delegation_file(fp, stid);
2526 put_nfs4_file(fp);
2527 return dl;
1da177e4
LT		 2528}
2529
2530/*
2531 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2532 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2533 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2534 * locking, this prevents us from being completely protocol-compliant. The
2535 * real solution to this problem is to start using unsigned file offsets in
2536 * the VFS, but this is a very deep change!
2537 */
2538static inline void
2539nfs4_transform_lock_offset(struct file_lock *lock)
2540{
2541 if (lock->fl_start < 0)
2542 lock->fl_start = OFFSET_MAX;
2543 if (lock->fl_end < 0)
2544 lock->fl_end = OFFSET_MAX;
2545}
2546
fd39ca9a 2547static int
1da177e4
LT		 2548nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2549{
2550 struct nfs4_stateowner *local = NULL;
2551 int status = 0;
2552
2553 if (hashval >= LOCK_HASH_SIZE)
2554 goto out;
2555 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2556 if (local == sop) {
2557 status = 1;
2558 goto out;
2559 }
2560 }
2561out:
2562 return status;
2563}
2564
2565
2566static inline void
2567nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2568{
2569 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2570 unsigned int hval = lockownerid_hashval(sop->so_id);
2571
2572 deny->ld_sop = NULL;
2573 if (nfs4_verify_lock_stateowner(sop, hval)) {
2574 kref_get(&sop->so_ref);
2575 deny->ld_sop = sop;
2576 deny->ld_clientid = sop->so_client->cl_clientid;
2577 }
2578 deny->ld_start = fl->fl_start;
2579 deny->ld_length = ~(u64)0;
2580 if (fl->fl_end != ~(u64)0)
2581 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2582 deny->ld_type = NFS4_READ_LT;
2583 if (fl->fl_type != F_RDLCK)
2584 deny->ld_type = NFS4_WRITE_LT;
2585}
2586
1da177e4
LT		 2587static struct nfs4_stateowner *
2588find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2589 struct xdr_netobj *owner)
2590{
2591 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2592 struct nfs4_stateowner *op;
2593
2594 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2595 if (cmp_owner_str(op, owner, clid))
2596 return op;
2597 }
2598 return NULL;
2599}
2600
2601/*
2602 * Alloc a lock owner structure.
2603 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2604 * occured.
2605 *
2606 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2607 */
2608
2609static struct nfs4_stateowner *
2610alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2611 struct nfs4_stateowner *sop;
2612 struct nfs4_replay *rp;
2613 unsigned int idhashval;
2614
2615 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2616 return NULL;
2617 idhashval = lockownerid_hashval(current_ownerid);
2618 INIT_LIST_HEAD(&sop->so_idhash);
2619 INIT_LIST_HEAD(&sop->so_strhash);
2620 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2621 INIT_LIST_HEAD(&sop->so_stateids);
2622 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2623 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2624 sop->so_time = 0;
2625 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2626 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2627 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2628 sop->so_is_open_owner = 0;
2629 sop->so_id = current_ownerid++;
2630 sop->so_client = clp;
b59e3c0e
NB		 2631 /* It is the openowner seqid that will be incremented in encode in the
2632 * case of new lockowners; so increment the lock seqid manually: */
2633 sop->so_seqid = lock->lk_new_lock_seqid + 1;
1da177e4
LT		 2634 sop->so_confirmed = 1;
2635 rp = &sop->so_replay;
2636 rp->rp_status = NFSERR_SERVERFAULT;
2637 rp->rp_buflen = 0;
2638 rp->rp_buf = rp->rp_ibuf;
2639 return sop;
2640}
2641
fd39ca9a 2642static struct nfs4_stateid *
1da177e4
LT		 2643alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2644{
2645 struct nfs4_stateid *stp;
2646 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2647
5ac049ac
N		 2648 stp = nfs4_alloc_stateid();
2649 if (stp == NULL)
1da177e4
LT		 2650 goto out;
2651 INIT_LIST_HEAD(&stp->st_hash);
2652 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2653 INIT_LIST_HEAD(&stp->st_perstateowner);
2654 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2655 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2656 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2657 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2658 stp->st_stateowner = sop;
13cd2184 2659 get_nfs4_file(fp);
1da177e4
LT		 2660 stp->st_file = fp;
2661 stp->st_stateid.si_boot = boot_time;
2662 stp->st_stateid.si_stateownerid = sop->so_id;
2663 stp->st_stateid.si_fileid = fp->fi_id;
2664 stp->st_stateid.si_generation = 0;
2665 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2666 stp->st_access_bmap = open_stp->st_access_bmap;
2667 stp->st_deny_bmap = open_stp->st_deny_bmap;
4c4cd222 2668 stp->st_openstp = open_stp;
1da177e4
LT		 2669
2670out:
2671 return stp;
2672}
2673
fd39ca9a 2674static int
1da177e4
LT		 2675check_lock_length(u64 offset, u64 length)
2676{
2677 return ((length == 0) || ((length != ~(u64)0) &&
2678 LOFF_OVERFLOW(offset, length)));
2679}
2680
2681/*
2682 * LOCK operation
2683 */
2684int
f2327d9a 2685nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
1da177e4 2686{
3e9e3dbe 2687 struct nfs4_stateowner *open_sop = NULL;
b59e3c0e 2688 struct nfs4_stateowner *lock_sop = NULL;
1da177e4
LT		 2689 struct nfs4_stateid *lock_stp;
2690 struct file *filp;
2691 struct file_lock file_lock;
2692 struct file_lock *conflock;
2693 int status = 0;
2694 unsigned int strhashval;
2695
2696 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2697 (long long) lock->lk_offset,
2698 (long long) lock->lk_length);
2699
1da177e4
LT		 2700 if (check_lock_length(lock->lk_offset, lock->lk_length))
2701 return nfserr_inval;
2702
2703 nfs4_lock_state();
2704
2705 if (lock->lk_is_new) {
893f8770
N		 2706 /*
2707 * Client indicates that this is a new lockowner.
2708 * Use open owner and open stateid to create lock owner and
2709 * lock stateid.
2710 */
1da177e4
LT		 2711 struct nfs4_stateid *open_stp = NULL;
2712 struct nfs4_file *fp;
2713
2714 status = nfserr_stale_clientid;
849823c5 2715 if (STALE_CLIENTID(&lock->lk_new_clientid))
1da177e4 2716 goto out;
1da177e4 2717
1da177e4
LT		 2718 /* validate and update open stateid and open seqid */
2719 status = nfs4_preprocess_seqid_op(current_fh,
2720 lock->lk_new_open_seqid,
2721 &lock->lk_new_open_stateid,
2722 CHECK_FH | OPEN_STATE,
b59e3c0e
NB		 2723 &lock->lk_stateowner, &open_stp,
2724 lock);
37515177 2725 if (status)
1da177e4 2726 goto out;
b59e3c0e 2727 open_sop = lock->lk_stateowner;
1da177e4
LT		 2728 /* create lockowner and lock stateid */
2729 fp = open_stp->st_file;
2730 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2731 open_sop->so_client->cl_clientid.cl_id,
2732 &lock->v.new.owner);
3e9e3dbe
N		 2733 /* XXX: Do we need to check for duplicate stateowners on
2734 * the same file, or should they just be allowed (and
2735 * create new stateids)? */
1da177e4 2736 status = nfserr_resource;
b59e3c0e
NB		 2737 lock_sop = alloc_init_lock_stateowner(strhashval,
2738 open_sop->so_client, open_stp, lock);
2739 if (lock_sop == NULL)
1da177e4 2740 goto out;
b59e3c0e
NB		 2741 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2742 if (lock_stp == NULL) {
2743 release_stateowner(lock_sop);
1da177e4
LT		 2744 goto out;
2745 }
1da177e4
LT		 2746 } else {
2747 /* lock (lock owner + lock stateid) already exists */
2748 status = nfs4_preprocess_seqid_op(current_fh,
2749 lock->lk_old_lock_seqid,
2750 &lock->lk_old_lock_stateid,
2751 CHECK_FH | LOCK_STATE,
4c4cd222 2752 &lock->lk_stateowner, &lock_stp, lock);
1da177e4
LT		 2753 if (status)
2754 goto out;
b59e3c0e 2755 lock_sop = lock->lk_stateowner;
1da177e4
LT		 2756 }
2757 /* lock->lk_stateowner and lock_stp have been created or found */
2758 filp = lock_stp->st_vfs_file;
2759
2760 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
849823c5 2761 dprintk("NFSD: nfsd4_lock: permission denied!\n");
1da177e4
LT		 2762 goto out;
2763 }
2764
0dd395dc
N		 2765 status = nfserr_grace;
2766 if (nfs4_in_grace() && !lock->lk_reclaim)
2767 goto out;
2768 status = nfserr_no_grace;
2769 if (!nfs4_in_grace() && lock->lk_reclaim)
2770 goto out;
2771
1da177e4
LT		 2772 locks_init_lock(&file_lock);
2773 switch (lock->lk_type) {
2774 case NFS4_READ_LT:
2775 case NFS4_READW_LT:
2776 file_lock.fl_type = F_RDLCK;
2777 break;
2778 case NFS4_WRITE_LT:
2779 case NFS4_WRITEW_LT:
2780 file_lock.fl_type = F_WRLCK;
2781 break;
2782 default:
2783 status = nfserr_inval;
2784 goto out;
2785 }
b59e3c0e 2786 file_lock.fl_owner = (fl_owner_t)lock_sop;
1da177e4
LT		 2787 file_lock.fl_pid = current->tgid;
2788 file_lock.fl_file = filp;
2789 file_lock.fl_flags = FL_POSIX;
2790
2791 file_lock.fl_start = lock->lk_offset;
2792 if ((lock->lk_length == ~(u64)0) ||
2793 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2794 file_lock.fl_end = ~(u64)0;
2795 else
2796 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2797 nfs4_transform_lock_offset(&file_lock);
2798
2799 /*
2800 * Try to lock the file in the VFS.
2801 * Note: locks.c uses the BKL to protect the inode's lock list.
2802 */
2803
2804 status = posix_lock_file(filp, &file_lock);
2805 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2806 file_lock.fl_ops->fl_release_private(&file_lock);
2807 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2808 switch (-status) {
2809 case 0: /* success! */
2810 update_stateid(&lock_stp->st_stateid);
2811 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2812 sizeof(stateid_t));
2813 goto out;
2814 case (EAGAIN):
2815 goto conflicting_lock;
2816 case (EDEADLK):
2817 status = nfserr_deadlock;
2818 default:
2819 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2820 goto out_destroy_new_stateid;
2821 }
2822
2823conflicting_lock:
2824 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2825 status = nfserr_denied;
2826 /* XXX There is a race here. Future patch needed to provide
2827 * an atomic posix_lock_and_test_file
2828 */
2829 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2830 status = nfserr_serverfault;
2831 goto out;
2832 }
2833 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2834
2835out_destroy_new_stateid:
2836 if (lock->lk_is_new) {
2837 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
893f8770
N		 2838 /*
2839 * An error encountered after instantiation of the new
2840 * stateid has forced us to destroy it.
2841 */
1da177e4
LT		 2842 release_state_owner(lock_stp, LOCK_STATE);
2843 }
2844out:
f2327d9a 2845 if (lock->lk_stateowner) {
1da177e4 2846 nfs4_get_stateowner(lock->lk_stateowner);
f2327d9a
NB		 2847 *replay_owner = lock->lk_stateowner;
2848 }
1da177e4
LT		 2849 nfs4_unlock_state();
2850 return status;
2851}
2852
2853/*
2854 * LOCKT operation
2855 */
2856int
2857nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2858{
2859 struct inode *inode;
2860 struct file file;
2861 struct file_lock file_lock;
2862 struct file_lock *conflicting_lock;
2863 int status;
2864
2865 if (nfs4_in_grace())
2866 return nfserr_grace;
2867
2868 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2869 return nfserr_inval;
2870
2871 lockt->lt_stateowner = NULL;
2872 nfs4_lock_state();
2873
2874 status = nfserr_stale_clientid;
849823c5 2875 if (STALE_CLIENTID(&lockt->lt_clientid))
1da177e4 2876 goto out;
1da177e4
LT		 2877
2878 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
849823c5 2879 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
1da177e4
LT		 2880 if (status == nfserr_symlink)
2881 status = nfserr_inval;
2882 goto out;
2883 }
2884
2885 inode = current_fh->fh_dentry->d_inode;
2886 locks_init_lock(&file_lock);
2887 switch (lockt->lt_type) {
2888 case NFS4_READ_LT:
2889 case NFS4_READW_LT:
2890 file_lock.fl_type = F_RDLCK;
2891 break;
2892 case NFS4_WRITE_LT:
2893 case NFS4_WRITEW_LT:
2894 file_lock.fl_type = F_WRLCK;
2895 break;
2896 default:
2897 printk("NFSD: nfs4_lockt: bad lock type!\n");
2898 status = nfserr_inval;
2899 goto out;
2900 }
2901
2902 lockt->lt_stateowner = find_lockstateowner_str(inode,
2903 &lockt->lt_clientid, &lockt->lt_owner);
2904 if (lockt->lt_stateowner)
2905 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2906 file_lock.fl_pid = current->tgid;
2907 file_lock.fl_flags = FL_POSIX;
2908
2909 file_lock.fl_start = lockt->lt_offset;
2910 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2911 file_lock.fl_end = ~(u64)0;
2912 else
2913 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2914
2915 nfs4_transform_lock_offset(&file_lock);
2916
2917 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2918 * since LOCKT doesn't require an OPEN, and therefore a struct
2919 * file may not exist, pass posix_test_lock a struct file with
2920 * only the dentry:inode set.
2921 */
2922 memset(&file, 0, sizeof (struct file));
2923 file.f_dentry = current_fh->fh_dentry;
2924
2925 status = nfs_ok;
2926 conflicting_lock = posix_test_lock(&file, &file_lock);
2927 if (conflicting_lock) {
2928 status = nfserr_denied;
2929 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2930 }
2931out:
2932 nfs4_unlock_state();
2933 return status;
2934}
2935
2936int
f2327d9a 2937nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku, struct nfs4_stateowner **replay_owner)
1da177e4
LT		 2938{
2939 struct nfs4_stateid *stp;
2940 struct file *filp = NULL;
2941 struct file_lock file_lock;
2942 int status;
2943
2944 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2945 (long long) locku->lu_offset,
2946 (long long) locku->lu_length);
2947
2948 if (check_lock_length(locku->lu_offset, locku->lu_length))
2949 return nfserr_inval;
2950
2951 nfs4_lock_state();
2952
2953 if ((status = nfs4_preprocess_seqid_op(current_fh,
2954 locku->lu_seqid,
2955 &locku->lu_stateid,
2956 CHECK_FH | LOCK_STATE,
2957 &locku->lu_stateowner, &stp, NULL)))
2958 goto out;
2959
2960 filp = stp->st_vfs_file;
2961 BUG_ON(!filp);
2962 locks_init_lock(&file_lock);
2963 file_lock.fl_type = F_UNLCK;
2964 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2965 file_lock.fl_pid = current->tgid;
2966 file_lock.fl_file = filp;
2967 file_lock.fl_flags = FL_POSIX;
2968 file_lock.fl_start = locku->lu_offset;
2969
2970 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2971 file_lock.fl_end = ~(u64)0;
2972 else
2973 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2974 nfs4_transform_lock_offset(&file_lock);
2975
2976 /*
2977 * Try to unlock the file in the VFS.
2978 */
2979 status = posix_lock_file(filp, &file_lock);
2980 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2981 file_lock.fl_ops->fl_release_private(&file_lock);
2982 if (status) {
849823c5 2983 dprintk("NFSD: nfs4_locku: posix_lock_file failed!\n");
1da177e4
LT		 2984 goto out_nfserr;
2985 }
2986 /*
2987 * OK, unlock succeeded; the only thing left to do is update the stateid.
2988 */
2989 update_stateid(&stp->st_stateid);
2990 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2991
2992out:
f2327d9a 2993 if (locku->lu_stateowner) {
1da177e4 2994 nfs4_get_stateowner(locku->lu_stateowner);
f2327d9a
NB		 2995 *replay_owner = locku->lu_stateowner;
2996 }
1da177e4
LT		 2997 nfs4_unlock_state();
2998 return status;
2999
3000out_nfserr:
3001 status = nfserrno(status);
3002 goto out;
3003}
3004
3005/*
3006 * returns
3007 * 1: locks held by lockowner
3008 * 0: no locks held by lockowner
3009 */
3010static int
3011check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3012{
3013 struct file_lock **flpp;
3014 struct inode *inode = filp->f_dentry->d_inode;
3015 int status = 0;
3016
3017 lock_kernel();
3018 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3019 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3020 status = 1;
3021 goto out;
3022 }
3023out:
3024 unlock_kernel();
3025 return status;
3026}
3027
3028int
3029nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3030{
3031 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3032 struct nfs4_stateowner *sop;
3033 struct nfs4_stateid *stp;
1da177e4 3034 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3035 struct list_head matches;
3036 int i;
1da177e4
LT		 3037 int status;
3038
3039 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3040 clid->cl_boot, clid->cl_id);
3041
3042 /* XXX check for lease expiration */
3043
3044 status = nfserr_stale_clientid;
849823c5 3045 if (STALE_CLIENTID(clid))
1da177e4 3046 return status;
1da177e4
LT		 3047
3048 nfs4_lock_state();
3049
3e9e3dbe
N		 3050 status = nfserr_locks_held;
3051 /* XXX: we're doing a linear search through all the lockowners.
3052 * Yipes! For now we'll just hope clients aren't really using
3053 * release_lockowner much, but eventually we have to fix these
3054 * data structures. */
3055 INIT_LIST_HEAD(&matches);
3056 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3057 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3058 if (!cmp_owner_str(sop, owner, clid))
3059 continue;
3060 list_for_each_entry(stp, &sop->so_stateids,
3061 st_perstateowner) {
3062 if (check_for_locks(stp->st_vfs_file, sop))
3063 goto out;
3064 /* Note: so_perclient unused for lockowners,
3065 * so it's OK to fool with here. */
3066 list_add(&sop->so_perclient, &matches);
3067 }
1da177e4 3068 }
3e9e3dbe
N		 3069 }
3070 /* Clients probably won't expect us to return with some (but not all)
3071 * of the lockowner state released; so don't release any until all
3072 * have been checked. */
3073 status = nfs_ok;
0fa822e4
N		 3074 while (!list_empty(&matches)) {
3075 sop = list_entry(matches.next, struct nfs4_stateowner,
3076 so_perclient);
3077 /* unhash_stateowner deletes so_perclient only
3078 * for openowners. */
3079 list_del(&sop->so_perclient);
3e9e3dbe 3080 release_stateowner(sop);
1da177e4
LT		 3081 }
3082out:
3083 nfs4_unlock_state();
3084 return status;
3085}
3086
3087static inline struct nfs4_client_reclaim *
a55370a3 3088alloc_reclaim(void)
1da177e4 3089{
a55370a3 3090 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3091}
3092
c7b9a459
N		 3093int
3094nfs4_has_reclaimed_state(const char *name)
3095{
3096 unsigned int strhashval = clientstr_hashval(name);
3097 struct nfs4_client *clp;
3098
3099 clp = find_confirmed_client_by_str(name, strhashval);
3100 return clp ? 1 : 0;
3101}
3102
1da177e4
LT		 3103/*
3104 * failure => all reset bets are off, nfserr_no_grace...
3105 */
190e4fbf
N		 3106int
3107nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3108{
3109 unsigned int strhashval;
3110 struct nfs4_client_reclaim *crp = NULL;
3111
a55370a3
N		 3112 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3113 crp = alloc_reclaim();
1da177e4
LT		 3114 if (!crp)
3115 return 0;
a55370a3 3116 strhashval = clientstr_hashval(name);
1da177e4
LT		 3117 INIT_LIST_HEAD(&crp->cr_strhash);
3118 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3119 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3120 reclaim_str_hashtbl_size++;
3121 return 1;
3122}
3123
3124static void
3125nfs4_release_reclaim(void)
3126{
3127 struct nfs4_client_reclaim *crp = NULL;
3128 int i;
3129
1da177e4
LT		 3130 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3131 while (!list_empty(&reclaim_str_hashtbl[i])) {
3132 crp = list_entry(reclaim_str_hashtbl[i].next,
3133 struct nfs4_client_reclaim, cr_strhash);
3134 list_del(&crp->cr_strhash);
1da177e4
LT		 3135 kfree(crp);
3136 reclaim_str_hashtbl_size--;
3137 }
3138 }
3139 BUG_ON(reclaim_str_hashtbl_size);
3140}
3141
3142/*
3143 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3144static struct nfs4_client_reclaim *
1da177e4
LT		 3145nfs4_find_reclaim_client(clientid_t *clid)
3146{
3147 unsigned int strhashval;
3148 struct nfs4_client *clp;
3149 struct nfs4_client_reclaim *crp = NULL;
3150
3151
3152 /* find clientid in conf_id_hashtbl */
3153 clp = find_confirmed_client(clid);
3154 if (clp == NULL)
3155 return NULL;
3156
a55370a3
N		 3157 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3158 clp->cl_name.len, clp->cl_name.data,
3159 clp->cl_recdir);
1da177e4
LT		 3160
3161 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3162 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3163 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3164 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3165 return crp;
3166 }
3167 }
3168 return NULL;
3169}
3170
3171/*
3172* Called from OPEN. Look for clientid in reclaim list.
3173*/
3174int
3175nfs4_check_open_reclaim(clientid_t *clid)
3176{
dfc83565 3177 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3178}
3179
ac4d8ff2 3180/* initialization to perform at module load time: */
1da177e4 3181
ac4d8ff2
N		 3182void
3183nfs4_state_init(void)
1da177e4
LT		 3184{
3185 int i;
1da177e4 3186
1da177e4
LT		 3187 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3188 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3189 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3190 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3191 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3192 }
3193 for (i = 0; i < FILE_HASH_SIZE; i++) {
3194 INIT_LIST_HEAD(&file_hashtbl[i]);
3195 }
3196 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3197 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3198 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3199 }
3200 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3201 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3202 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3203 }
3204 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3205 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3206 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3207 }
1da177e4 3208 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3209 INIT_LIST_HEAD(&close_lru);
3210 INIT_LIST_HEAD(&client_lru);
3211 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3212 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3213 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3214 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3215}
3216
190e4fbf
N		 3217static void
3218nfsd4_load_reboot_recovery_data(void)
3219{
3220 int status;
3221
0964a3d3
N		 3222 nfs4_lock_state();
3223 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3224 status = nfsd4_recdir_load();
0964a3d3 3225 nfs4_unlock_state();
190e4fbf
N		 3226 if (status)
3227 printk("NFSD: Failure reading reboot recovery data\n");
3228}
3229
ac4d8ff2
N		 3230/* initialization to perform when the nfsd service is started: */
3231
3232static void
3233__nfs4_state_start(void)
3234{
3235 time_t grace_time;
3236
1da177e4 3237 boot_time = get_seconds();
d99a05ad
N		 3238 grace_time = max(user_lease_time, lease_time);
3239 lease_time = user_lease_time;
a76b4319 3240 in_grace = 1;
d99a05ad 3241 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3242 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3243 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3244}
3245
3246int
76a3550e 3247nfs4_state_start(void)
1da177e4
LT		 3248{
3249 int status;
3250
3251 if (nfs4_init)
3252 return 0;
3253 status = nfsd4_init_slabs();
3254 if (status)
3255 return status;
190e4fbf 3256 nfsd4_load_reboot_recovery_data();
76a3550e 3257 __nfs4_state_start();
1da177e4
LT		 3258 nfs4_init = 1;
3259 return 0;
3260}
3261
3262int
3263nfs4_in_grace(void)
3264{
a76b4319 3265 return in_grace;
1da177e4
LT		 3266}
3267
3268time_t
3269nfs4_lease_time(void)
3270{
3271 return lease_time;
3272}
3273
3274static void
3275__nfs4_state_shutdown(void)
3276{
3277 int i;
3278 struct nfs4_client *clp = NULL;
3279 struct nfs4_delegation *dp = NULL;
3280 struct nfs4_stateowner *sop = NULL;
3281 struct list_head *pos, *next, reaplist;
3282
3283 list_for_each_safe(pos, next, &close_lru) {
3284 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3285 list_del(&sop->so_close_lru);
3286 nfs4_put_stateowner(sop);
3287 }
3288
3289 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3290 while (!list_empty(&conf_id_hashtbl[i])) {
3291 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3292 expire_client(clp);
3293 }
3294 while (!list_empty(&unconf_str_hashtbl[i])) {
3295 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3296 expire_client(clp);
3297 }
3298 }
3299 INIT_LIST_HEAD(&reaplist);
3300 spin_lock(&recall_lock);
3301 list_for_each_safe(pos, next, &del_recall_lru) {
3302 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3303 list_move(&dp->dl_recall_lru, &reaplist);
3304 }
3305 spin_unlock(&recall_lock);
3306 list_for_each_safe(pos, next, &reaplist) {
3307 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3308 list_del_init(&dp->dl_recall_lru);
3309 unhash_delegation(dp);
3310 }
3311
1da177e4 3312 cancel_delayed_work(&laundromat_work);
58da282b
N		 3313 flush_workqueue(laundry_wq);
3314 destroy_workqueue(laundry_wq);
190e4fbf 3315 nfsd4_shutdown_recdir();
1da177e4 3316 nfs4_init = 0;
1da177e4
LT		 3317}
3318
3319void
3320nfs4_state_shutdown(void)
3321{
3322 nfs4_lock_state();
3323 nfs4_release_reclaim();
3324 __nfs4_state_shutdown();
3325 nfsd4_free_slabs();
3326 nfs4_unlock_state();
3327}
3328
0964a3d3
N		 3329static void
3330nfs4_set_recdir(char *recdir)
3331{
3332 nfs4_lock_state();
3333 strcpy(user_recovery_dirname, recdir);
3334 nfs4_unlock_state();
3335}
3336
3337/*
3338 * Change the NFSv4 recovery directory to recdir.
3339 */
3340int
3341nfs4_reset_recoverydir(char *recdir)
3342{
3343 int status;
3344 struct nameidata nd;
3345
3346 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3347 if (status)
3348 return status;
3349 status = -ENOTDIR;
3350 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3351 nfs4_set_recdir(recdir);
3352 status = 0;
3353 }
3354 path_release(&nd);
3355 return status;
3356}
3357
1da177e4
LT		 3358/*
3359 * Called when leasetime is changed.
3360 *
d99a05ad
N		 3361 * The only way the protocol gives us to handle on-the-fly lease changes is to
3362 * simulate a reboot. Instead of doing that, we just wait till the next time
3363 * we start to register any changes in lease time. If the administrator
3364 * really wants to change the lease time *now*, they can go ahead and bring
3365 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3366 */
3367void
3368nfs4_reset_lease(time_t leasetime)
3369{
d99a05ad
N		 3370 lock_kernel();
3371 user_lease_time = leasetime;
3372 unlock_kernel();
1da177e4 3373}
kernel source for telekom puls (alcatel/mediatek)