projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] nfsd4: relax new lock seqid check
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
CommitLineData
1da177e4
LT		 1/*
2* linux/fs/nfsd/nfs4state.c
3*
4* Copyright (c) 2001 The Regents of the University of Michigan.
5* All rights reserved.
6*
7* Kendrick Smith <kmsmith@umich.edu>
8* Andy Adamson <kandros@umich.edu>
9*
10* Redistribution and use in source and binary forms, with or without
11* modification, are permitted provided that the following conditions
12* are met:
13*
14* 1. Redistributions of source code must retain the above copyright
15* notice, this list of conditions and the following disclaimer.
16* 2. Redistributions in binary form must reproduce the above copyright
17* notice, this list of conditions and the following disclaimer in the
18* documentation and/or other materials provided with the distribution.
19* 3. Neither the name of the University nor the names of its
20* contributors may be used to endorse or promote products derived
21* from this software without specific prior written permission.
22*
23* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34*
35*/
36
37#include <linux/param.h>
38#include <linux/major.h>
39#include <linux/slab.h>
40
41#include <linux/sunrpc/svc.h>
42#include <linux/nfsd/nfsd.h>
43#include <linux/nfsd/cache.h>
44#include <linux/mount.h>
45#include <linux/workqueue.h>
46#include <linux/smp_lock.h>
47#include <linux/kthread.h>
48#include <linux/nfs4.h>
49#include <linux/nfsd/state.h>
50#include <linux/nfsd/xdr4.h>
0964a3d3 51#include <linux/namei.h>
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:
627 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
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
LT		 680
681 status = nfserr_inval;
682 if (!check_name(clname))
683 goto out;
684
a55370a3
N		 685 status = nfs4_make_rec_clidname(dname, &clname);
686 if (status)
687 goto out;
688
1da177e4
LT		 689 /*
690 * XXX The Duplicate Request Cache (DRC) has been checked (??)
691 * We get here on a DRC miss.
692 */
693
a55370a3 694 strhashval = clientstr_hashval(dname);
1da177e4 695
1da177e4 696 nfs4_lock_state();
28ce6054
N		 697 conf = find_confirmed_client_by_str(dname, strhashval);
698 if (conf) {
1da177e4
LT		 699 /*
700 * CASE 0:
701 * clname match, confirmed, different principal
702 * or different ip_address
703 */
704 status = nfserr_clid_inuse;
28ce6054
N		 705 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
706 || conf->cl_addr != ip_addr) {
1da177e4
LT		 707 printk("NFSD: setclientid: string in use by client"
708 "(clientid %08x/%08x)\n",
28ce6054 709 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 710 goto out;
711 }
1da177e4 712 }
28ce6054 713 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 714 status = nfserr_resource;
715 if (!conf) {
716 /*
717 * CASE 4:
718 * placed first, because it is the normal case.
719 */
720 if (unconf)
721 expire_client(unconf);
a55370a3
N		 722 new = create_client(clname, dname);
723 if (new == NULL)
1da177e4
LT		 724 goto out;
725 copy_verf(new, &clverifier);
726 new->cl_addr = ip_addr;
727 copy_cred(&new->cl_cred,&rqstp->rq_cred);
728 gen_clid(new);
729 gen_confirm(new);
730 gen_callback(new, setclid);
731 add_to_unconfirmed(new, strhashval);
732 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
733 /*
734 * CASE 1:
735 * cl_name match, confirmed, principal match
736 * verifier match: probable callback update
737 *
738 * remove any unconfirmed nfs4_client with
739 * matching cl_name, cl_verifier, and cl_clientid
740 *
741 * create and insert an unconfirmed nfs4_client with same
742 * cl_name, cl_verifier, and cl_clientid as existing
743 * nfs4_client, but with the new callback info and a
744 * new cl_confirm
745 */
31f4a6c1
N		 746 if (unconf) {
747 /* Note this is removing unconfirmed {*x***},
748 * which is stronger than RFC recommended {vxc**}.
749 * This has the advantage that there is at most
750 * one {*x***} in either list at any time.
751 */
752 expire_client(unconf);
1da177e4 753 }
a55370a3
N		 754 new = create_client(clname, dname);
755 if (new == NULL)
1da177e4
LT		 756 goto out;
757 copy_verf(new,&conf->cl_verifier);
758 new->cl_addr = ip_addr;
759 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760 copy_clid(new, conf);
761 gen_confirm(new);
762 gen_callback(new, setclid);
763 add_to_unconfirmed(new,strhashval);
764 } else if (!unconf) {
765 /*
766 * CASE 2:
767 * clname match, confirmed, principal match
768 * verfier does not match
769 * no unconfirmed. create a new unconfirmed nfs4_client
770 * using input clverifier, clname, and callback info
771 * and generate a new cl_clientid and cl_confirm.
772 */
a55370a3
N		 773 new = create_client(clname, dname);
774 if (new == NULL)
1da177e4
LT		 775 goto out;
776 copy_verf(new,&clverifier);
777 new->cl_addr = ip_addr;
778 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779 gen_clid(new);
780 gen_confirm(new);
781 gen_callback(new, setclid);
782 add_to_unconfirmed(new, strhashval);
783 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
784 /*
785 * CASE3:
786 * confirmed found (name, principal match)
787 * confirmed verifier does not match input clverifier
788 *
789 * unconfirmed found (name match)
790 * confirmed->cl_confirm != unconfirmed->cl_confirm
791 *
792 * remove unconfirmed.
793 *
794 * create an unconfirmed nfs4_client
795 * with same cl_name as existing confirmed nfs4_client,
796 * but with new callback info, new cl_clientid,
797 * new cl_verifier and a new cl_confirm
798 */
799 expire_client(unconf);
a55370a3
N		 800 new = create_client(clname, dname);
801 if (new == NULL)
1da177e4
LT		 802 goto out;
803 copy_verf(new,&clverifier);
804 new->cl_addr = ip_addr;
805 copy_cred(&new->cl_cred,&rqstp->rq_cred);
806 gen_clid(new);
807 gen_confirm(new);
808 gen_callback(new, setclid);
809 add_to_unconfirmed(new, strhashval);
810 } else {
811 /* No cases hit !!! */
812 status = nfserr_inval;
813 goto out;
814
815 }
816 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
817 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
818 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
819 status = nfs_ok;
820out:
821 nfs4_unlock_state();
822 return status;
823}
824
825
826/*
827 * RFC 3010 has a complex implmentation description of processing a
828 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
829 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
830 *
831 * NOTE: callback information will be processed here in a future patch
832 */
833int
834nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
835{
836 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
21ab45a4 837 struct nfs4_client *conf, *unconf;
1da177e4
LT		 838 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
839 clientid_t * clid = &setclientid_confirm->sc_clientid;
840 int status;
841
842 if (STALE_CLIENTID(clid))
843 return nfserr_stale_clientid;
844 /*
845 * XXX The Duplicate Request Cache (DRC) has been checked (??)
846 * We get here on a DRC miss.
847 */
848
849 nfs4_lock_state();
21ab45a4
N		 850
851 conf = find_confirmed_client(clid);
852 unconf = find_unconfirmed_client(clid);
853
854 status = nfserr_clid_inuse;
855 if (conf && conf->cl_addr != ip_addr)
856 goto out;
857 if (unconf && unconf->cl_addr != ip_addr)
858 goto out;
859
1da177e4
LT		 860 if ((conf && unconf) &&
861 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
862 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 863 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 864 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 865 /* CASE 1:
866 * unconf record that matches input clientid and input confirm.
867 * conf record that matches input clientid.
868 * conf and unconf records match names, verifiers
869 */
1da177e4
LT		 870 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
871 status = nfserr_clid_inuse;
872 else {
1a69c179
N		 873 /* XXX: We just turn off callbacks until we can handle
874 * change request correctly. */
cb36d634 875 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 876 gen_confirm(conf);
46309029 877 nfsd4_remove_clid_dir(unconf);
1a69c179 878 expire_client(unconf);
1da177e4 879 status = nfs_ok;
1a69c179 880
1da177e4 881 }
7c79f737 882 } else if ((conf && !unconf) ||
1da177e4
LT		 883 ((conf && unconf) &&
884 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 885 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 886 /* CASE 2:
887 * conf record that matches input clientid.
888 * if unconf record matches input clientid, then
889 * unconf->cl_name or unconf->cl_verifier don't match the
890 * conf record.
891 */
21ab45a4 892 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 893 status = nfserr_clid_inuse;
21ab45a4 894 else
1da177e4 895 status = nfs_ok;
7c79f737
N		 896 } else if (!conf && unconf
897 && cmp_verf(&unconf->cl_confirm, &confirm)) {
898 /* CASE 3:
899 * conf record not found.
900 * unconf record found.
901 * unconf->cl_confirm matches input confirm
902 */
1da177e4
LT		 903 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
904 status = nfserr_clid_inuse;
905 } else {
1a69c179
N		 906 unsigned int hash =
907 clientstr_hashval(unconf->cl_recdir);
908 conf = find_confirmed_client_by_str(unconf->cl_recdir,
909 hash);
910 if (conf) {
c7b9a459 911 nfsd4_remove_clid_dir(conf);
1a69c179
N		 912 expire_client(conf);
913 }
1da177e4 914 move_to_confirmed(unconf);
21ab45a4 915 conf = unconf;
1a69c179 916 status = nfs_ok;
1da177e4 917 }
7c79f737
N		 918 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
919 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
920 &confirm)))) {
921 /* CASE 4:
922 * conf record not found, or if conf, conf->cl_confirm does not
923 * match input confirm.
924 * unconf record not found, or if unconf, unconf->cl_confirm
925 * does not match input confirm.
926 */
1da177e4 927 status = nfserr_stale_clientid;
7c79f737 928 } else {
08e8987c
N		 929 /* check that we have hit one of the cases...*/
930 status = nfserr_clid_inuse;
931 }
1da177e4
LT		 932out:
933 if (!status)
21ab45a4 934 nfsd4_probe_callback(conf);
1da177e4
LT		 935 nfs4_unlock_state();
936 return status;
937}
938
939/*
940 * Open owner state (share locks)
941 */
942
943/* hash tables for nfs4_stateowner */
944#define OWNER_HASH_BITS 8
945#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
946#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
947
948#define ownerid_hashval(id) \
949 ((id) & OWNER_HASH_MASK)
950#define ownerstr_hashval(clientid, ownername) \
951 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
952
953static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
954static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
955
956/* hash table for nfs4_file */
957#define FILE_HASH_BITS 8
958#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
959#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
960/* hash table for (open)nfs4_stateid */
961#define STATEID_HASH_BITS 10
962#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
963#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
964
965#define file_hashval(x) \
966 hash_ptr(x, FILE_HASH_BITS)
967#define stateid_hashval(owner_id, file_id) \
968 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
969
970static struct list_head file_hashtbl[FILE_HASH_SIZE];
971static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
972
973/* OPEN Share state helper functions */
974static inline struct nfs4_file *
975alloc_init_file(struct inode *ino)
976{
977 struct nfs4_file *fp;
978 unsigned int hashval = file_hashval(ino);
979
e60d4398
N		 980 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
981 if (fp) {
13cd2184 982 kref_init(&fp->fi_ref);
1da177e4 983 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 984 INIT_LIST_HEAD(&fp->fi_stateids);
985 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 986 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
987 fp->fi_inode = igrab(ino);
988 fp->fi_id = current_fileid++;
1da177e4
LT		 989 return fp;
990 }
991 return NULL;
992}
993
e60d4398
N		 994static void
995nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 996{
e60d4398
N		 997 int status;
998
999 if (*slab == NULL)
1000 return;
1001 status = kmem_cache_destroy(*slab);
1002 *slab = NULL;
1003 WARN_ON(status);
1da177e4
LT		 1004}
1005
1006static void
1007nfsd4_free_slabs(void)
1008{
e60d4398
N		 1009 nfsd4_free_slab(&stateowner_slab);
1010 nfsd4_free_slab(&file_slab);
5ac049ac 1011 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1012 nfsd4_free_slab(&deleg_slab);
e60d4398 1013}
1da177e4 1014
e60d4398
N		 1015static int
1016nfsd4_init_slabs(void)
1017{
1018 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1019 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1020 if (stateowner_slab == NULL)
1021 goto out_nomem;
1022 file_slab = kmem_cache_create("nfsd4_files",
1023 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1024 if (file_slab == NULL)
1025 goto out_nomem;
5ac049ac
N		 1026 stateid_slab = kmem_cache_create("nfsd4_stateids",
1027 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1028 if (stateid_slab == NULL)
1029 goto out_nomem;
5b2d21c1
N		 1030 deleg_slab = kmem_cache_create("nfsd4_delegations",
1031 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1032 if (deleg_slab == NULL)
1033 goto out_nomem;
e60d4398
N		 1034 return 0;
1035out_nomem:
1036 nfsd4_free_slabs();
1037 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1038 return -ENOMEM;
1da177e4
LT		 1039}
1040
1041void
1042nfs4_free_stateowner(struct kref *kref)
1043{
1044 struct nfs4_stateowner *sop =
1045 container_of(kref, struct nfs4_stateowner, so_ref);
1046 kfree(sop->so_owner.data);
1047 kmem_cache_free(stateowner_slab, sop);
1048}
1049
1050static inline struct nfs4_stateowner *
1051alloc_stateowner(struct xdr_netobj *owner)
1052{
1053 struct nfs4_stateowner *sop;
1054
1055 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1056 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1057 memcpy(sop->so_owner.data, owner->data, owner->len);
1058 sop->so_owner.len = owner->len;
1059 kref_init(&sop->so_ref);
1060 return sop;
1061 }
1062 kmem_cache_free(stateowner_slab, sop);
1063 }
1064 return NULL;
1065}
1066
1067static struct nfs4_stateowner *
1068alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1069 struct nfs4_stateowner *sop;
1070 struct nfs4_replay *rp;
1071 unsigned int idhashval;
1072
1073 if (!(sop = alloc_stateowner(&open->op_owner)))
1074 return NULL;
1075 idhashval = ownerid_hashval(current_ownerid);
1076 INIT_LIST_HEAD(&sop->so_idhash);
1077 INIT_LIST_HEAD(&sop->so_strhash);
1078 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1079 INIT_LIST_HEAD(&sop->so_stateids);
1080 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1081 INIT_LIST_HEAD(&sop->so_close_lru);
1082 sop->so_time = 0;
1083 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1084 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1085 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1086 sop->so_is_open_owner = 1;
1087 sop->so_id = current_ownerid++;
1088 sop->so_client = clp;
1089 sop->so_seqid = open->op_seqid;
1090 sop->so_confirmed = 0;
1091 rp = &sop->so_replay;
1092 rp->rp_status = NFSERR_SERVERFAULT;
1093 rp->rp_buflen = 0;
1094 rp->rp_buf = rp->rp_ibuf;
1095 return sop;
1096}
1097
1098static void
1099release_stateid_lockowners(struct nfs4_stateid *open_stp)
1100{
1101 struct nfs4_stateowner *lock_sop;
1102
ea1da636
N		 1103 while (!list_empty(&open_stp->st_lockowners)) {
1104 lock_sop = list_entry(open_stp->st_lockowners.next,
1105 struct nfs4_stateowner, so_perstateid);
1106 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1107 BUG_ON(lock_sop->so_is_open_owner);
1108 release_stateowner(lock_sop);
1109 }
1110}
1111
1112static void
1113unhash_stateowner(struct nfs4_stateowner *sop)
1114{
1115 struct nfs4_stateid *stp;
1116
1117 list_del(&sop->so_idhash);
1118 list_del(&sop->so_strhash);
6fa305de 1119 if (sop->so_is_open_owner)
1da177e4 1120 list_del(&sop->so_perclient);
ea1da636
N		 1121 list_del(&sop->so_perstateid);
1122 while (!list_empty(&sop->so_stateids)) {
1123 stp = list_entry(sop->so_stateids.next,
1124 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1125 if (sop->so_is_open_owner)
1126 release_stateid(stp, OPEN_STATE);
1127 else
1128 release_stateid(stp, LOCK_STATE);
1129 }
1130}
1131
1132static void
1133release_stateowner(struct nfs4_stateowner *sop)
1134{
1135 unhash_stateowner(sop);
1136 list_del(&sop->so_close_lru);
1137 nfs4_put_stateowner(sop);
1138}
1139
1140static inline void
1141init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1142 struct nfs4_stateowner *sop = open->op_stateowner;
1143 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1144
1145 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1146 INIT_LIST_HEAD(&stp->st_perstateowner);
1147 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1148 INIT_LIST_HEAD(&stp->st_perfile);
1149 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1150 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1151 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1152 stp->st_stateowner = sop;
13cd2184 1153 get_nfs4_file(fp);
1da177e4
LT		 1154 stp->st_file = fp;
1155 stp->st_stateid.si_boot = boot_time;
1156 stp->st_stateid.si_stateownerid = sop->so_id;
1157 stp->st_stateid.si_fileid = fp->fi_id;
1158 stp->st_stateid.si_generation = 0;
1159 stp->st_access_bmap = 0;
1160 stp->st_deny_bmap = 0;
1161 __set_bit(open->op_share_access, &stp->st_access_bmap);
1162 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
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;
1298 ret = nfserr_share_denied;
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;
1823 } else {
1824 /* Stateid was not found, this is a new OPEN */
1825 int flags = 0;
1826 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1827 flags = MAY_WRITE;
1828 else
1829 flags = MAY_READ;
567d9829
N		 1830 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1831 if (status)
1da177e4
LT		 1832 goto out;
1833 init_stateid(stp, fp, open);
1834 status = nfsd4_truncate(rqstp, current_fh, open);
1835 if (status) {
1836 release_stateid(stp, OPEN_STATE);
1837 goto out;
1838 }
1839 }
1840 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1841
1842 /*
1843 * Attempt to hand out a delegation. No error return, because the
1844 * OPEN succeeds even if we fail.
1845 */
1846 nfs4_open_delegation(current_fh, open, stp);
1847
1848 status = nfs_ok;
1849
1850 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1851 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1852 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1853out:
13cd2184
N		 1854 if (fp)
1855 put_nfs4_file(fp);
37515177
N		 1856 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1857 nfs4_set_claim_prev(open);
1da177e4
LT		 1858 /*
1859 * To finish the open response, we just need to set the rflags.
1860 */
1861 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1862 if (!open->op_stateowner->so_confirmed)
1863 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1864
1865 return status;
1866}
1867
58da282b 1868static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1869static struct work_struct laundromat_work;
1870static void laundromat_main(void *);
1871static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1872
1873int
1874nfsd4_renew(clientid_t *clid)
1875{
1876 struct nfs4_client *clp;
1877 int status;
1878
1879 nfs4_lock_state();
1880 dprintk("process_renew(%08x/%08x): starting\n",
1881 clid->cl_boot, clid->cl_id);
1882 status = nfserr_stale_clientid;
1883 if (STALE_CLIENTID(clid))
1884 goto out;
1885 clp = find_confirmed_client(clid);
1886 status = nfserr_expired;
1887 if (clp == NULL) {
1888 /* We assume the client took too long to RENEW. */
1889 dprintk("nfsd4_renew: clientid not found!\n");
1890 goto out;
1891 }
1892 renew_client(clp);
1893 status = nfserr_cb_path_down;
ea1da636 1894 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1895 && !atomic_read(&clp->cl_callback.cb_set))
1896 goto out;
1897 status = nfs_ok;
1898out:
1899 nfs4_unlock_state();
1900 return status;
1901}
1902
a76b4319
N		 1903static void
1904end_grace(void)
1905{
1906 dprintk("NFSD: end of grace period\n");
c7b9a459 1907 nfsd4_recdir_purge_old();
a76b4319
N		 1908 in_grace = 0;
1909}
1910
fd39ca9a 1911static time_t
1da177e4
LT		 1912nfs4_laundromat(void)
1913{
1914 struct nfs4_client *clp;
1915 struct nfs4_stateowner *sop;
1916 struct nfs4_delegation *dp;
1917 struct list_head *pos, *next, reaplist;
1918 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1919 time_t t, clientid_val = NFSD_LEASE_TIME;
1920 time_t u, test_val = NFSD_LEASE_TIME;
1921
1922 nfs4_lock_state();
1923
1924 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1925 if (in_grace)
1926 end_grace();
1da177e4
LT		 1927 list_for_each_safe(pos, next, &client_lru) {
1928 clp = list_entry(pos, struct nfs4_client, cl_lru);
1929 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1930 t = clp->cl_time - cutoff;
1931 if (clientid_val > t)
1932 clientid_val = t;
1933 break;
1934 }
1935 dprintk("NFSD: purging unused client (clientid %08x)\n",
1936 clp->cl_clientid.cl_id);
c7b9a459 1937 nfsd4_remove_clid_dir(clp);
1da177e4
LT		 1938 expire_client(clp);
1939 }
1940 INIT_LIST_HEAD(&reaplist);
1941 spin_lock(&recall_lock);
1942 list_for_each_safe(pos, next, &del_recall_lru) {
1943 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1944 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1945 u = dp->dl_time - cutoff;
1946 if (test_val > u)
1947 test_val = u;
1948 break;
1949 }
1950 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1951 dp, dp->dl_flock);
1952 list_move(&dp->dl_recall_lru, &reaplist);
1953 }
1954 spin_unlock(&recall_lock);
1955 list_for_each_safe(pos, next, &reaplist) {
1956 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1957 list_del_init(&dp->dl_recall_lru);
1958 unhash_delegation(dp);
1959 }
1960 test_val = NFSD_LEASE_TIME;
1961 list_for_each_safe(pos, next, &close_lru) {
1962 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1963 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1964 u = sop->so_time - cutoff;
1965 if (test_val > u)
1966 test_val = u;
1967 break;
1968 }
1969 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1970 sop->so_id);
1971 list_del(&sop->so_close_lru);
1972 nfs4_put_stateowner(sop);
1973 }
1974 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1975 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1976 nfs4_unlock_state();
1977 return clientid_val;
1978}
1979
1980void
1981laundromat_main(void *not_used)
1982{
1983 time_t t;
1984
1985 t = nfs4_laundromat();
1986 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1987 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1988}
1989
1990/* search ownerid_hashtbl[] and close_lru for stateid owner
1991 * (stateid->si_stateownerid)
1992 */
fd39ca9a 1993static struct nfs4_stateowner *
1da177e4
LT		 1994find_openstateowner_id(u32 st_id, int flags) {
1995 struct nfs4_stateowner *local = NULL;
1996
1997 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1998 if (flags & CLOSE_STATE) {
1999 list_for_each_entry(local, &close_lru, so_close_lru) {
2000 if (local->so_id == st_id)
2001 return local;
2002 }
2003 }
2004 return NULL;
2005}
2006
2007static inline int
2008nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2009{
2010 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2011}
2012
2013static int
2014STALE_STATEID(stateid_t *stateid)
2015{
2016 if (stateid->si_boot == boot_time)
2017 return 0;
2018 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2019 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2020 stateid->si_generation);
2021 return 1;
2022}
2023
2024static inline int
2025access_permit_read(unsigned long access_bmap)
2026{
2027 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2028 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2029 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2030}
2031
2032static inline int
2033access_permit_write(unsigned long access_bmap)
2034{
2035 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2036 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2037}
2038
2039static
2040int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2041{
2042 int status = nfserr_openmode;
2043
2044 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2045 goto out;
2046 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2047 goto out;
2048 status = nfs_ok;
2049out:
2050 return status;
2051}
2052
1da177e4
LT		 2053static inline int
2054check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2055{
2056 /* Trying to call delegreturn with a special stateid? Yuch: */
2057 if (!(flags & (RD_STATE | WR_STATE)))
2058 return nfserr_bad_stateid;
2059 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2060 return nfs_ok;
2061 else if (nfs4_in_grace()) {
2062 /* Answer in remaining cases depends on existance of
2063 * conflicting state; so we must wait out the grace period. */
2064 return nfserr_grace;
2065 } else if (flags & WR_STATE)
2066 return nfs4_share_conflict(current_fh,
2067 NFS4_SHARE_DENY_WRITE);
2068 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2069 return nfs4_share_conflict(current_fh,
2070 NFS4_SHARE_DENY_READ);
2071}
2072
2073/*
2074 * Allow READ/WRITE during grace period on recovered state only for files
2075 * that are not able to provide mandatory locking.
2076 */
2077static inline int
2078io_during_grace_disallowed(struct inode *inode, int flags)
2079{
2080 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2081 && MANDATORY_LOCK(inode);
2082}
2083
2084/*
2085* Checks for stateid operations
2086*/
2087int
2088nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2089{
2090 struct nfs4_stateid *stp = NULL;
2091 struct nfs4_delegation *dp = NULL;
2092 stateid_t *stidp;
2093 struct inode *ino = current_fh->fh_dentry->d_inode;
2094 int status;
2095
2096 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2097 stateid->si_boot, stateid->si_stateownerid,
2098 stateid->si_fileid, stateid->si_generation);
2099 if (filpp)
2100 *filpp = NULL;
2101
2102 if (io_during_grace_disallowed(ino, flags))
2103 return nfserr_grace;
2104
2105 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2106 return check_special_stateids(current_fh, stateid, flags);
2107
2108 /* STALE STATEID */
2109 status = nfserr_stale_stateid;
2110 if (STALE_STATEID(stateid))
2111 goto out;
2112
2113 /* BAD STATEID */
2114 status = nfserr_bad_stateid;
2115 if (!stateid->si_fileid) { /* delegation stateid */
2116 if(!(dp = find_delegation_stateid(ino, stateid))) {
2117 dprintk("NFSD: delegation stateid not found\n");
2118 if (nfs4_in_grace())
2119 status = nfserr_grace;
2120 goto out;
2121 }
2122 stidp = &dp->dl_stateid;
2123 } else { /* open or lock stateid */
2124 if (!(stp = find_stateid(stateid, flags))) {
2125 dprintk("NFSD: open or lock stateid not found\n");
2126 if (nfs4_in_grace())
2127 status = nfserr_grace;
2128 goto out;
2129 }
2130 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2131 goto out;
2132 if (!stp->st_stateowner->so_confirmed)
2133 goto out;
2134 stidp = &stp->st_stateid;
2135 }
2136 if (stateid->si_generation > stidp->si_generation)
2137 goto out;
2138
2139 /* OLD STATEID */
2140 status = nfserr_old_stateid;
2141 if (stateid->si_generation < stidp->si_generation)
2142 goto out;
2143 if (stp) {
2144 if ((status = nfs4_check_openmode(stp,flags)))
2145 goto out;
2146 renew_client(stp->st_stateowner->so_client);
2147 if (filpp)
2148 *filpp = stp->st_vfs_file;
2149 } else if (dp) {
2150 if ((status = nfs4_check_delegmode(dp, flags)))
2151 goto out;
2152 renew_client(dp->dl_client);
2153 if (flags & DELEG_RET)
2154 unhash_delegation(dp);
2155 if (filpp)
2156 *filpp = dp->dl_vfs_file;
2157 }
2158 status = nfs_ok;
2159out:
2160 return status;
2161}
2162
2163
2164/*
2165 * Checks for sequence id mutating operations.
2166 */
fd39ca9a 2167static int
1da177e4
LT		 2168nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, clientid_t *lockclid)
2169{
2170 int status;
2171 struct nfs4_stateid *stp;
2172 struct nfs4_stateowner *sop;
2173
2174 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2175 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2176 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2177 stateid->si_generation);
2178
2179 *stpp = NULL;
2180 *sopp = NULL;
2181
2182 status = nfserr_bad_stateid;
2183 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2184 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2185 goto out;
2186 }
2187
2188 status = nfserr_stale_stateid;
2189 if (STALE_STATEID(stateid))
2190 goto out;
2191 /*
2192 * We return BAD_STATEID if filehandle doesn't match stateid,
2193 * the confirmed flag is incorrecly set, or the generation
2194 * number is incorrect.
2195 * If there is no entry in the openfile table for this id,
2196 * we can't always return BAD_STATEID;
2197 * this might be a retransmitted CLOSE which has arrived after
2198 * the openfile has been released.
2199 */
2200 if (!(stp = find_stateid(stateid, flags)))
2201 goto no_nfs4_stateid;
2202
2203 status = nfserr_bad_stateid;
2204
2205 /* for new lock stateowners:
2206 * check that the lock->v.new.open_stateid
2207 * refers to an open stateowner
2208 *
2209 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2210 * as the open_stateid->st_stateowner->so_client->clientid
2211 */
2212 if (lockclid) {
2213 struct nfs4_stateowner *sop = stp->st_stateowner;
2214 struct nfs4_client *clp = sop->so_client;
2215
2216 if (!sop->so_is_open_owner)
2217 goto out;
2218 if (!cmp_clid(&clp->cl_clientid, lockclid))
2219 goto out;
2220 }
2221
2222 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2223 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2224 goto out;
2225 }
2226
2227 *stpp = stp;
2228 *sopp = sop = stp->st_stateowner;
2229
2230 /*
2231 * We now validate the seqid and stateid generation numbers.
2232 * For the moment, we ignore the possibility of
2233 * generation number wraparound.
2234 */
bd9aac52 2235 if (seqid != sop->so_seqid)
1da177e4
LT		 2236 goto check_replay;
2237
2238 if (sop->so_confirmed) {
2239 if (flags & CONFIRM) {
2240 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2241 goto out;
2242 }
2243 }
2244 else {
2245 if (!(flags & CONFIRM)) {
2246 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2247 goto out;
2248 }
2249 }
2250 if (stateid->si_generation > stp->st_stateid.si_generation) {
2251 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2252 goto out;
2253 }
2254
2255 status = nfserr_old_stateid;
2256 if (stateid->si_generation < stp->st_stateid.si_generation) {
2257 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2258 goto out;
2259 }
2260 /* XXX renew the client lease here */
2261 status = nfs_ok;
2262
2263out:
2264 return status;
2265
2266no_nfs4_stateid:
2267
2268 /*
2269 * We determine whether this is a bad stateid or a replay,
2270 * starting by trying to look up the stateowner.
2271 * If stateowner is not found - stateid is bad.
2272 */
2273 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2274 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2275 status = nfserr_bad_stateid;
2276 goto out;
2277 }
2278 *sopp = sop;
2279
2280check_replay:
bd9aac52 2281 if (seqid == sop->so_seqid - 1) {
1da177e4
LT		 2282 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2283 /* indicate replay to calling function */
2284 status = NFSERR_REPLAY_ME;
2285 } else {
bd9aac52 2286 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid, seqid);
1da177e4
LT		 2287
2288 *sopp = NULL;
2289 status = nfserr_bad_seqid;
2290 }
2291 goto out;
2292}
2293
2294int
2295nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2296{
2297 int status;
2298 struct nfs4_stateowner *sop;
2299 struct nfs4_stateid *stp;
2300
2301 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2302 (int)current_fh->fh_dentry->d_name.len,
2303 current_fh->fh_dentry->d_name.name);
2304
2305 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2306 goto out;
2307
2308 nfs4_lock_state();
2309
2310 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2311 &oc->oc_req_stateid,
2312 CHECK_FH | CONFIRM | OPEN_STATE,
2313 &oc->oc_stateowner, &stp, NULL)))
2314 goto out;
2315
2316 sop = oc->oc_stateowner;
2317 sop->so_confirmed = 1;
2318 update_stateid(&stp->st_stateid);
2319 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2320 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2321 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2322 stp->st_stateid.si_boot,
2323 stp->st_stateid.si_stateownerid,
2324 stp->st_stateid.si_fileid,
2325 stp->st_stateid.si_generation);
c7b9a459
N		 2326
2327 nfsd4_create_clid_dir(sop->so_client);
1da177e4
LT		 2328out:
2329 if (oc->oc_stateowner)
2330 nfs4_get_stateowner(oc->oc_stateowner);
2331 nfs4_unlock_state();
2332 return status;
2333}
2334
2335
2336/*
2337 * unset all bits in union bitmap (bmap) that
2338 * do not exist in share (from successful OPEN_DOWNGRADE)
2339 */
2340static void
2341reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2342{
2343 int i;
2344 for (i = 1; i < 4; i++) {
2345 if ((i & access) != i)
2346 __clear_bit(i, bmap);
2347 }
2348}
2349
2350static void
2351reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2352{
2353 int i;
2354 for (i = 0; i < 4; i++) {
2355 if ((i & deny) != i)
2356 __clear_bit(i, bmap);
2357 }
2358}
2359
2360int
2361nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2362{
2363 int status;
2364 struct nfs4_stateid *stp;
2365 unsigned int share_access;
2366
2367 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2368 (int)current_fh->fh_dentry->d_name.len,
2369 current_fh->fh_dentry->d_name.name);
2370
2371 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2372 return nfserr_inval;
2373
2374 nfs4_lock_state();
2375 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2376 &od->od_stateid,
2377 CHECK_FH | OPEN_STATE,
2378 &od->od_stateowner, &stp, NULL)))
2379 goto out;
2380
2381 status = nfserr_inval;
2382 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2383 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2384 stp->st_access_bmap, od->od_share_access);
2385 goto out;
2386 }
2387 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2388 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2389 stp->st_deny_bmap, od->od_share_deny);
2390 goto out;
2391 }
2392 set_access(&share_access, stp->st_access_bmap);
2393 nfs4_file_downgrade(stp->st_vfs_file,
2394 share_access & ~od->od_share_access);
2395
2396 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2397 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2398
2399 update_stateid(&stp->st_stateid);
2400 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2401 status = nfs_ok;
2402out:
2403 if (od->od_stateowner)
2404 nfs4_get_stateowner(od->od_stateowner);
2405 nfs4_unlock_state();
2406 return status;
2407}
2408
2409/*
2410 * nfs4_unlock_state() called after encode
2411 */
2412int
2413nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2414{
2415 int status;
2416 struct nfs4_stateid *stp;
2417
2418 dprintk("NFSD: nfsd4_close on file %.*s\n",
2419 (int)current_fh->fh_dentry->d_name.len,
2420 current_fh->fh_dentry->d_name.name);
2421
2422 nfs4_lock_state();
2423 /* check close_lru for replay */
2424 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2425 &close->cl_stateid,
2426 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2427 &close->cl_stateowner, &stp, NULL)))
2428 goto out;
2429 /*
2430 * Return success, but first update the stateid.
2431 */
2432 status = nfs_ok;
2433 update_stateid(&stp->st_stateid);
2434 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2435
2436 /* release_state_owner() calls nfsd_close() if needed */
2437 release_state_owner(stp, OPEN_STATE);
2438out:
2439 if (close->cl_stateowner)
2440 nfs4_get_stateowner(close->cl_stateowner);
2441 nfs4_unlock_state();
2442 return status;
2443}
2444
2445int
2446nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2447{
2448 int status;
2449
2450 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2451 goto out;
2452
2453 nfs4_lock_state();
2454 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2455 nfs4_unlock_state();
2456out:
2457 return status;
2458}
2459
2460
2461/*
2462 * Lock owner state (byte-range locks)
2463 */
2464#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2465#define LOCK_HASH_BITS 8
2466#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2467#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2468
2469#define lockownerid_hashval(id) \
2470 ((id) & LOCK_HASH_MASK)
2471
2472static inline unsigned int
2473lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2474 struct xdr_netobj *ownername)
2475{
2476 return (file_hashval(inode) + cl_id
2477 + opaque_hashval(ownername->data, ownername->len))
2478 & LOCK_HASH_MASK;
2479}
2480
2481static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2482static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2483static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2484
fd39ca9a 2485static struct nfs4_stateid *
1da177e4
LT		 2486find_stateid(stateid_t *stid, int flags)
2487{
2488 struct nfs4_stateid *local = NULL;
2489 u32 st_id = stid->si_stateownerid;
2490 u32 f_id = stid->si_fileid;
2491 unsigned int hashval;
2492
2493 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2494 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2495 hashval = stateid_hashval(st_id, f_id);
2496 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2497 if ((local->st_stateid.si_stateownerid == st_id) &&
2498 (local->st_stateid.si_fileid == f_id))
2499 return local;
2500 }
2501 }
2502 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2503 hashval = stateid_hashval(st_id, f_id);
2504 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2505 if ((local->st_stateid.si_stateownerid == st_id) &&
2506 (local->st_stateid.si_fileid == f_id))
2507 return local;
2508 }
2509 } else
2510 printk("NFSD: find_stateid: ERROR: no state flag\n");
2511 return NULL;
2512}
2513
2514static struct nfs4_delegation *
2515find_delegation_stateid(struct inode *ino, stateid_t *stid)
2516{
13cd2184
N		 2517 struct nfs4_file *fp;
2518 struct nfs4_delegation *dl;
1da177e4
LT		 2519
2520 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2521 stid->si_boot, stid->si_stateownerid,
2522 stid->si_fileid, stid->si_generation);
2523
1da177e4 2524 fp = find_file(ino);
13cd2184
N		 2525 if (!fp)
2526 return NULL;
2527 dl = find_delegation_file(fp, stid);
2528 put_nfs4_file(fp);
2529 return dl;
1da177e4
LT		 2530}
2531
2532/*
2533 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2534 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2535 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2536 * locking, this prevents us from being completely protocol-compliant. The
2537 * real solution to this problem is to start using unsigned file offsets in
2538 * the VFS, but this is a very deep change!
2539 */
2540static inline void
2541nfs4_transform_lock_offset(struct file_lock *lock)
2542{
2543 if (lock->fl_start < 0)
2544 lock->fl_start = OFFSET_MAX;
2545 if (lock->fl_end < 0)
2546 lock->fl_end = OFFSET_MAX;
2547}
2548
fd39ca9a 2549static int
1da177e4
LT		 2550nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2551{
2552 struct nfs4_stateowner *local = NULL;
2553 int status = 0;
2554
2555 if (hashval >= LOCK_HASH_SIZE)
2556 goto out;
2557 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2558 if (local == sop) {
2559 status = 1;
2560 goto out;
2561 }
2562 }
2563out:
2564 return status;
2565}
2566
2567
2568static inline void
2569nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2570{
2571 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2572 unsigned int hval = lockownerid_hashval(sop->so_id);
2573
2574 deny->ld_sop = NULL;
2575 if (nfs4_verify_lock_stateowner(sop, hval)) {
2576 kref_get(&sop->so_ref);
2577 deny->ld_sop = sop;
2578 deny->ld_clientid = sop->so_client->cl_clientid;
2579 }
2580 deny->ld_start = fl->fl_start;
2581 deny->ld_length = ~(u64)0;
2582 if (fl->fl_end != ~(u64)0)
2583 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2584 deny->ld_type = NFS4_READ_LT;
2585 if (fl->fl_type != F_RDLCK)
2586 deny->ld_type = NFS4_WRITE_LT;
2587}
2588
1da177e4
LT		 2589static struct nfs4_stateowner *
2590find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2591 struct xdr_netobj *owner)
2592{
2593 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2594 struct nfs4_stateowner *op;
2595
2596 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2597 if (cmp_owner_str(op, owner, clid))
2598 return op;
2599 }
2600 return NULL;
2601}
2602
2603/*
2604 * Alloc a lock owner structure.
2605 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2606 * occured.
2607 *
2608 * strhashval = lock_ownerstr_hashval
1da177e4
LT		 2609 */
2610
2611static struct nfs4_stateowner *
2612alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2613 struct nfs4_stateowner *sop;
2614 struct nfs4_replay *rp;
2615 unsigned int idhashval;
2616
2617 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2618 return NULL;
2619 idhashval = lockownerid_hashval(current_ownerid);
2620 INIT_LIST_HEAD(&sop->so_idhash);
2621 INIT_LIST_HEAD(&sop->so_strhash);
2622 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2623 INIT_LIST_HEAD(&sop->so_stateids);
2624 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2625 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2626 sop->so_time = 0;
2627 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2628 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2629 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2630 sop->so_is_open_owner = 0;
2631 sop->so_id = current_ownerid++;
2632 sop->so_client = clp;
bd9aac52 2633 sop->so_seqid = lock->lk_new_lock_seqid;
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;
2668
2669out:
2670 return stp;
2671}
2672
fd39ca9a 2673static int
1da177e4
LT		 2674check_lock_length(u64 offset, u64 length)
2675{
2676 return ((length == 0) || ((length != ~(u64)0) &&
2677 LOFF_OVERFLOW(offset, length)));
2678}
2679
2680/*
2681 * LOCK operation
2682 */
2683int
2684nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2685{
3e9e3dbe 2686 struct nfs4_stateowner *open_sop = NULL;
1da177e4
LT		 2687 struct nfs4_stateid *lock_stp;
2688 struct file *filp;
2689 struct file_lock file_lock;
2690 struct file_lock *conflock;
2691 int status = 0;
2692 unsigned int strhashval;
2693
2694 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2695 (long long) lock->lk_offset,
2696 (long long) lock->lk_length);
2697
1da177e4
LT		 2698 if (check_lock_length(lock->lk_offset, lock->lk_length))
2699 return nfserr_inval;
2700
2701 nfs4_lock_state();
2702
2703 if (lock->lk_is_new) {
893f8770
N		 2704 /*
2705 * Client indicates that this is a new lockowner.
2706 * Use open owner and open stateid to create lock owner and
2707 * lock stateid.
2708 */
1da177e4
LT		 2709 struct nfs4_stateid *open_stp = NULL;
2710 struct nfs4_file *fp;
2711
2712 status = nfserr_stale_clientid;
2713 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2714 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2715 goto out;
2716 }
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,
2723 &open_sop, &open_stp,
2724 &lock->v.new.clientid);
37515177 2725 if (status)
1da177e4 2726 goto out;
1da177e4
LT		 2727 /* create lockowner and lock stateid */
2728 fp = open_stp->st_file;
2729 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2730 open_sop->so_client->cl_clientid.cl_id,
2731 &lock->v.new.owner);
3e9e3dbe
N		 2732 /* XXX: Do we need to check for duplicate stateowners on
2733 * the same file, or should they just be allowed (and
2734 * create new stateids)? */
1da177e4
LT		 2735 status = nfserr_resource;
2736 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2737 goto out;
2738 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2739 fp, open_stp)) == NULL) {
2740 release_stateowner(lock->lk_stateowner);
2741 lock->lk_stateowner = NULL;
2742 goto out;
2743 }
2744 /* bump the open seqid used to create the lock */
2745 open_sop->so_seqid++;
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,
2752 &lock->lk_stateowner, &lock_stp, NULL);
2753 if (status)
2754 goto out;
2755 }
2756 /* lock->lk_stateowner and lock_stp have been created or found */
2757 filp = lock_stp->st_vfs_file;
2758
2759 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2760 printk("NFSD: nfsd4_lock: permission denied!\n");
2761 goto out;
2762 }
2763
0dd395dc
N		 2764 status = nfserr_grace;
2765 if (nfs4_in_grace() && !lock->lk_reclaim)
2766 goto out;
2767 status = nfserr_no_grace;
2768 if (!nfs4_in_grace() && lock->lk_reclaim)
2769 goto out;
2770
1da177e4
LT		 2771 locks_init_lock(&file_lock);
2772 switch (lock->lk_type) {
2773 case NFS4_READ_LT:
2774 case NFS4_READW_LT:
2775 file_lock.fl_type = F_RDLCK;
2776 break;
2777 case NFS4_WRITE_LT:
2778 case NFS4_WRITEW_LT:
2779 file_lock.fl_type = F_WRLCK;
2780 break;
2781 default:
2782 status = nfserr_inval;
2783 goto out;
2784 }
2785 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2786 file_lock.fl_pid = current->tgid;
2787 file_lock.fl_file = filp;
2788 file_lock.fl_flags = FL_POSIX;
2789
2790 file_lock.fl_start = lock->lk_offset;
2791 if ((lock->lk_length == ~(u64)0) ||
2792 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2793 file_lock.fl_end = ~(u64)0;
2794 else
2795 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2796 nfs4_transform_lock_offset(&file_lock);
2797
2798 /*
2799 * Try to lock the file in the VFS.
2800 * Note: locks.c uses the BKL to protect the inode's lock list.
2801 */
2802
2803 status = posix_lock_file(filp, &file_lock);
2804 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2805 file_lock.fl_ops->fl_release_private(&file_lock);
2806 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2807 switch (-status) {
2808 case 0: /* success! */
2809 update_stateid(&lock_stp->st_stateid);
2810 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2811 sizeof(stateid_t));
2812 goto out;
2813 case (EAGAIN):
2814 goto conflicting_lock;
2815 case (EDEADLK):
2816 status = nfserr_deadlock;
2817 default:
2818 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2819 goto out_destroy_new_stateid;
2820 }
2821
2822conflicting_lock:
2823 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2824 status = nfserr_denied;
2825 /* XXX There is a race here. Future patch needed to provide
2826 * an atomic posix_lock_and_test_file
2827 */
2828 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2829 status = nfserr_serverfault;
2830 goto out;
2831 }
2832 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2833
2834out_destroy_new_stateid:
2835 if (lock->lk_is_new) {
2836 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
893f8770
N		 2837 /*
2838 * An error encountered after instantiation of the new
2839 * stateid has forced us to destroy it.
2840 */
1da177e4
LT		 2841 if (!seqid_mutating_err(status))
2842 open_sop->so_seqid--;
2843
2844 release_state_owner(lock_stp, LOCK_STATE);
2845 }
2846out:
2847 if (lock->lk_stateowner)
2848 nfs4_get_stateowner(lock->lk_stateowner);
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;
2875 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2876 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2877 goto out;
2878 }
2879
2880 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2881 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2882 if (status == nfserr_symlink)
2883 status = nfserr_inval;
2884 goto out;
2885 }
2886
2887 inode = current_fh->fh_dentry->d_inode;
2888 locks_init_lock(&file_lock);
2889 switch (lockt->lt_type) {
2890 case NFS4_READ_LT:
2891 case NFS4_READW_LT:
2892 file_lock.fl_type = F_RDLCK;
2893 break;
2894 case NFS4_WRITE_LT:
2895 case NFS4_WRITEW_LT:
2896 file_lock.fl_type = F_WRLCK;
2897 break;
2898 default:
2899 printk("NFSD: nfs4_lockt: bad lock type!\n");
2900 status = nfserr_inval;
2901 goto out;
2902 }
2903
2904 lockt->lt_stateowner = find_lockstateowner_str(inode,
2905 &lockt->lt_clientid, &lockt->lt_owner);
2906 if (lockt->lt_stateowner)
2907 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2908 file_lock.fl_pid = current->tgid;
2909 file_lock.fl_flags = FL_POSIX;
2910
2911 file_lock.fl_start = lockt->lt_offset;
2912 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2913 file_lock.fl_end = ~(u64)0;
2914 else
2915 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2916
2917 nfs4_transform_lock_offset(&file_lock);
2918
2919 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2920 * since LOCKT doesn't require an OPEN, and therefore a struct
2921 * file may not exist, pass posix_test_lock a struct file with
2922 * only the dentry:inode set.
2923 */
2924 memset(&file, 0, sizeof (struct file));
2925 file.f_dentry = current_fh->fh_dentry;
2926
2927 status = nfs_ok;
2928 conflicting_lock = posix_test_lock(&file, &file_lock);
2929 if (conflicting_lock) {
2930 status = nfserr_denied;
2931 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2932 }
2933out:
2934 nfs4_unlock_state();
2935 return status;
2936}
2937
2938int
2939nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2940{
2941 struct nfs4_stateid *stp;
2942 struct file *filp = NULL;
2943 struct file_lock file_lock;
2944 int status;
2945
2946 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2947 (long long) locku->lu_offset,
2948 (long long) locku->lu_length);
2949
2950 if (check_lock_length(locku->lu_offset, locku->lu_length))
2951 return nfserr_inval;
2952
2953 nfs4_lock_state();
2954
2955 if ((status = nfs4_preprocess_seqid_op(current_fh,
2956 locku->lu_seqid,
2957 &locku->lu_stateid,
2958 CHECK_FH | LOCK_STATE,
2959 &locku->lu_stateowner, &stp, NULL)))
2960 goto out;
2961
2962 filp = stp->st_vfs_file;
2963 BUG_ON(!filp);
2964 locks_init_lock(&file_lock);
2965 file_lock.fl_type = F_UNLCK;
2966 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2967 file_lock.fl_pid = current->tgid;
2968 file_lock.fl_file = filp;
2969 file_lock.fl_flags = FL_POSIX;
2970 file_lock.fl_start = locku->lu_offset;
2971
2972 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2973 file_lock.fl_end = ~(u64)0;
2974 else
2975 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2976 nfs4_transform_lock_offset(&file_lock);
2977
2978 /*
2979 * Try to unlock the file in the VFS.
2980 */
2981 status = posix_lock_file(filp, &file_lock);
2982 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2983 file_lock.fl_ops->fl_release_private(&file_lock);
2984 if (status) {
2985 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2986 goto out_nfserr;
2987 }
2988 /*
2989 * OK, unlock succeeded; the only thing left to do is update the stateid.
2990 */
2991 update_stateid(&stp->st_stateid);
2992 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2993
2994out:
2995 if (locku->lu_stateowner)
2996 nfs4_get_stateowner(locku->lu_stateowner);
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;
3045 if (STALE_CLIENTID(clid)) {
3046 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3047 return status;
3048 }
3049
3050 nfs4_lock_state();
3051
3e9e3dbe
N		 3052 status = nfserr_locks_held;
3053 /* XXX: we're doing a linear search through all the lockowners.
3054 * Yipes! For now we'll just hope clients aren't really using
3055 * release_lockowner much, but eventually we have to fix these
3056 * data structures. */
3057 INIT_LIST_HEAD(&matches);
3058 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3059 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3060 if (!cmp_owner_str(sop, owner, clid))
3061 continue;
3062 list_for_each_entry(stp, &sop->so_stateids,
3063 st_perstateowner) {
3064 if (check_for_locks(stp->st_vfs_file, sop))
3065 goto out;
3066 /* Note: so_perclient unused for lockowners,
3067 * so it's OK to fool with here. */
3068 list_add(&sop->so_perclient, &matches);
3069 }
1da177e4 3070 }
3e9e3dbe
N		 3071 }
3072 /* Clients probably won't expect us to return with some (but not all)
3073 * of the lockowner state released; so don't release any until all
3074 * have been checked. */
3075 status = nfs_ok;
0fa822e4
N		 3076 while (!list_empty(&matches)) {
3077 sop = list_entry(matches.next, struct nfs4_stateowner,
3078 so_perclient);
3079 /* unhash_stateowner deletes so_perclient only
3080 * for openowners. */
3081 list_del(&sop->so_perclient);
3e9e3dbe 3082 release_stateowner(sop);
1da177e4
LT		 3083 }
3084out:
3085 nfs4_unlock_state();
3086 return status;
3087}
3088
3089static inline struct nfs4_client_reclaim *
a55370a3 3090alloc_reclaim(void)
1da177e4 3091{
a55370a3 3092 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3093}
3094
c7b9a459
N		 3095int
3096nfs4_has_reclaimed_state(const char *name)
3097{
3098 unsigned int strhashval = clientstr_hashval(name);
3099 struct nfs4_client *clp;
3100
3101 clp = find_confirmed_client_by_str(name, strhashval);
3102 return clp ? 1 : 0;
3103}
3104
1da177e4
LT		 3105/*
3106 * failure => all reset bets are off, nfserr_no_grace...
3107 */
190e4fbf
N		 3108int
3109nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3110{
3111 unsigned int strhashval;
3112 struct nfs4_client_reclaim *crp = NULL;
3113
a55370a3
N		 3114 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3115 crp = alloc_reclaim();
1da177e4
LT		 3116 if (!crp)
3117 return 0;
a55370a3 3118 strhashval = clientstr_hashval(name);
1da177e4
LT		 3119 INIT_LIST_HEAD(&crp->cr_strhash);
3120 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3121 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3122 reclaim_str_hashtbl_size++;
3123 return 1;
3124}
3125
3126static void
3127nfs4_release_reclaim(void)
3128{
3129 struct nfs4_client_reclaim *crp = NULL;
3130 int i;
3131
1da177e4
LT		 3132 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3133 while (!list_empty(&reclaim_str_hashtbl[i])) {
3134 crp = list_entry(reclaim_str_hashtbl[i].next,
3135 struct nfs4_client_reclaim, cr_strhash);
3136 list_del(&crp->cr_strhash);
1da177e4
LT		 3137 kfree(crp);
3138 reclaim_str_hashtbl_size--;
3139 }
3140 }
3141 BUG_ON(reclaim_str_hashtbl_size);
3142}
3143
3144/*
3145 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3146static struct nfs4_client_reclaim *
1da177e4
LT		 3147nfs4_find_reclaim_client(clientid_t *clid)
3148{
3149 unsigned int strhashval;
3150 struct nfs4_client *clp;
3151 struct nfs4_client_reclaim *crp = NULL;
3152
3153
3154 /* find clientid in conf_id_hashtbl */
3155 clp = find_confirmed_client(clid);
3156 if (clp == NULL)
3157 return NULL;
3158
a55370a3
N		 3159 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3160 clp->cl_name.len, clp->cl_name.data,
3161 clp->cl_recdir);
1da177e4
LT		 3162
3163 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3164 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3165 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3166 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3167 return crp;
3168 }
3169 }
3170 return NULL;
3171}
3172
3173/*
3174* Called from OPEN. Look for clientid in reclaim list.
3175*/
3176int
3177nfs4_check_open_reclaim(clientid_t *clid)
3178{
dfc83565 3179 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3180}
3181
ac4d8ff2 3182/* initialization to perform at module load time: */
1da177e4 3183
ac4d8ff2
N		 3184void
3185nfs4_state_init(void)
1da177e4
LT		 3186{
3187 int i;
1da177e4 3188
1da177e4
LT		 3189 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3190 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3191 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3192 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3193 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3194 }
3195 for (i = 0; i < FILE_HASH_SIZE; i++) {
3196 INIT_LIST_HEAD(&file_hashtbl[i]);
3197 }
3198 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3199 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3200 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3201 }
3202 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3203 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3204 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3205 }
3206 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3207 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3208 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3209 }
1da177e4 3210 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3211 INIT_LIST_HEAD(&close_lru);
3212 INIT_LIST_HEAD(&client_lru);
3213 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3214 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3215 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3216 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3217}
3218
190e4fbf
N		 3219static void
3220nfsd4_load_reboot_recovery_data(void)
3221{
3222 int status;
3223
0964a3d3
N		 3224 nfs4_lock_state();
3225 nfsd4_init_recdir(user_recovery_dirname);
190e4fbf 3226 status = nfsd4_recdir_load();
0964a3d3 3227 nfs4_unlock_state();
190e4fbf
N		 3228 if (status)
3229 printk("NFSD: Failure reading reboot recovery data\n");
3230}
3231
ac4d8ff2
N		 3232/* initialization to perform when the nfsd service is started: */
3233
3234static void
3235__nfs4_state_start(void)
3236{
3237 time_t grace_time;
3238
1da177e4 3239 boot_time = get_seconds();
d99a05ad
N		 3240 grace_time = max(user_lease_time, lease_time);
3241 lease_time = user_lease_time;
a76b4319 3242 in_grace = 1;
d99a05ad 3243 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3244 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3245 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3246}
3247
3248int
76a3550e 3249nfs4_state_start(void)
1da177e4
LT		 3250{
3251 int status;
3252
3253 if (nfs4_init)
3254 return 0;
3255 status = nfsd4_init_slabs();
3256 if (status)
3257 return status;
190e4fbf 3258 nfsd4_load_reboot_recovery_data();
76a3550e 3259 __nfs4_state_start();
1da177e4
LT		 3260 nfs4_init = 1;
3261 return 0;
3262}
3263
3264int
3265nfs4_in_grace(void)
3266{
a76b4319 3267 return in_grace;
1da177e4
LT		 3268}
3269
3270time_t
3271nfs4_lease_time(void)
3272{
3273 return lease_time;
3274}
3275
3276static void
3277__nfs4_state_shutdown(void)
3278{
3279 int i;
3280 struct nfs4_client *clp = NULL;
3281 struct nfs4_delegation *dp = NULL;
3282 struct nfs4_stateowner *sop = NULL;
3283 struct list_head *pos, *next, reaplist;
3284
3285 list_for_each_safe(pos, next, &close_lru) {
3286 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3287 list_del(&sop->so_close_lru);
3288 nfs4_put_stateowner(sop);
3289 }
3290
3291 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3292 while (!list_empty(&conf_id_hashtbl[i])) {
3293 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3294 expire_client(clp);
3295 }
3296 while (!list_empty(&unconf_str_hashtbl[i])) {
3297 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3298 expire_client(clp);
3299 }
3300 }
3301 INIT_LIST_HEAD(&reaplist);
3302 spin_lock(&recall_lock);
3303 list_for_each_safe(pos, next, &del_recall_lru) {
3304 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3305 list_move(&dp->dl_recall_lru, &reaplist);
3306 }
3307 spin_unlock(&recall_lock);
3308 list_for_each_safe(pos, next, &reaplist) {
3309 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3310 list_del_init(&dp->dl_recall_lru);
3311 unhash_delegation(dp);
3312 }
3313
1da177e4 3314 cancel_delayed_work(&laundromat_work);
58da282b
N		 3315 flush_workqueue(laundry_wq);
3316 destroy_workqueue(laundry_wq);
190e4fbf 3317 nfsd4_shutdown_recdir();
1da177e4 3318 nfs4_init = 0;
1da177e4
LT		 3319}
3320
3321void
3322nfs4_state_shutdown(void)
3323{
3324 nfs4_lock_state();
3325 nfs4_release_reclaim();
3326 __nfs4_state_shutdown();
3327 nfsd4_free_slabs();
3328 nfs4_unlock_state();
3329}
3330
0964a3d3
N		 3331static void
3332nfs4_set_recdir(char *recdir)
3333{
3334 nfs4_lock_state();
3335 strcpy(user_recovery_dirname, recdir);
3336 nfs4_unlock_state();
3337}
3338
3339/*
3340 * Change the NFSv4 recovery directory to recdir.
3341 */
3342int
3343nfs4_reset_recoverydir(char *recdir)
3344{
3345 int status;
3346 struct nameidata nd;
3347
3348 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3349 if (status)
3350 return status;
3351 status = -ENOTDIR;
3352 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3353 nfs4_set_recdir(recdir);
3354 status = 0;
3355 }
3356 path_release(&nd);
3357 return status;
3358}
3359
1da177e4
LT		 3360/*
3361 * Called when leasetime is changed.
3362 *
d99a05ad
N		 3363 * The only way the protocol gives us to handle on-the-fly lease changes is to
3364 * simulate a reboot. Instead of doing that, we just wait till the next time
3365 * we start to register any changes in lease time. If the administrator
3366 * really wants to change the lease time *now*, they can go ahead and bring
3367 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3368 */
3369void
3370nfs4_reset_lease(time_t leasetime)
3371{
d99a05ad
N		 3372 lock_kernel();
3373 user_lease_time = leasetime;
3374 unlock_kernel();
1da177e4 3375}
Linux 6.x block layer and io_uring tree(s)