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[PATCH] knfsd: nfsd4: initialize recovery directory
[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>
51
52#define NFSDDBG_FACILITY NFSDDBG_PROC
53
54/* Globals */
55static time_t lease_time = 90; /* default lease time */
d99a05ad 56static time_t user_lease_time = 90;
fd39ca9a 57static time_t boot_time;
a76b4319 58static int in_grace = 1;
1da177e4
LT		 59static u32 current_clientid = 1;
60static u32 current_ownerid = 1;
61static u32 current_fileid = 1;
62static u32 current_delegid = 1;
63static u32 nfs4_init;
fd39ca9a
N		 64static stateid_t zerostateid; /* bits all 0 */
65static stateid_t onestateid; /* bits all 1 */
66
67#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
68#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
1da177e4 69
1da177e4 70/* forward declarations */
fd39ca9a 71static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
1da177e4
LT		 72static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
73static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
190e4fbf 74extern char recovery_dirname[];
1da177e4
LT		 75
76/* Locking:
77 *
78 * client_sema:
79 * protects clientid_hashtbl[], clientstr_hashtbl[],
80 * unconfstr_hashtbl[], uncofid_hashtbl[].
81 */
82static DECLARE_MUTEX(client_sema);
83
fd39ca9a
N		 84static kmem_cache_t *stateowner_slab = NULL;
85static kmem_cache_t *file_slab = NULL;
86static kmem_cache_t *stateid_slab = NULL;
87static kmem_cache_t *deleg_slab = NULL;
e60d4398 88
1da177e4
LT		 89void
90nfs4_lock_state(void)
91{
92 down(&client_sema);
93}
94
95void
96nfs4_unlock_state(void)
97{
98 up(&client_sema);
99}
100
101static inline u32
102opaque_hashval(const void *ptr, int nbytes)
103{
104 unsigned char *cptr = (unsigned char *) ptr;
105
106 u32 x = 0;
107 while (nbytes--) {
108 x *= 37;
109 x += *cptr++;
110 }
111 return x;
112}
113
114/* forward declarations */
115static void release_stateowner(struct nfs4_stateowner *sop);
116static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 117
118/*
119 * Delegation state
120 */
121
122/* recall_lock protects the del_recall_lru */
fd39ca9a 123static spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 124static struct list_head del_recall_lru;
125
13cd2184
N		 126static void
127free_nfs4_file(struct kref *kref)
128{
129 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
130 list_del(&fp->fi_hash);
131 iput(fp->fi_inode);
132 kmem_cache_free(file_slab, fp);
133}
134
135static inline void
136put_nfs4_file(struct nfs4_file *fi)
137{
138 kref_put(&fi->fi_ref, free_nfs4_file);
139}
140
141static inline void
142get_nfs4_file(struct nfs4_file *fi)
143{
144 kref_get(&fi->fi_ref);
145}
146
1da177e4
LT		 147static struct nfs4_delegation *
148alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
149{
150 struct nfs4_delegation *dp;
151 struct nfs4_file *fp = stp->st_file;
152 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
153
154 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 155 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
156 if (dp == NULL)
1da177e4 157 return dp;
ea1da636
N		 158 INIT_LIST_HEAD(&dp->dl_perfile);
159 INIT_LIST_HEAD(&dp->dl_perclnt);
1da177e4
LT		 160 INIT_LIST_HEAD(&dp->dl_recall_lru);
161 dp->dl_client = clp;
13cd2184 162 get_nfs4_file(fp);
1da177e4
LT		 163 dp->dl_file = fp;
164 dp->dl_flock = NULL;
165 get_file(stp->st_vfs_file);
166 dp->dl_vfs_file = stp->st_vfs_file;
167 dp->dl_type = type;
168 dp->dl_recall.cbr_dp = NULL;
169 dp->dl_recall.cbr_ident = cb->cb_ident;
170 dp->dl_recall.cbr_trunc = 0;
171 dp->dl_stateid.si_boot = boot_time;
172 dp->dl_stateid.si_stateownerid = current_delegid++;
173 dp->dl_stateid.si_fileid = 0;
174 dp->dl_stateid.si_generation = 0;
175 dp->dl_fhlen = current_fh->fh_handle.fh_size;
176 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
177 current_fh->fh_handle.fh_size);
178 dp->dl_time = 0;
179 atomic_set(&dp->dl_count, 1);
ea1da636
N		 180 list_add(&dp->dl_perfile, &fp->fi_delegations);
181 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1da177e4
LT		 182 return dp;
183}
184
185void
186nfs4_put_delegation(struct nfs4_delegation *dp)
187{
188 if (atomic_dec_and_test(&dp->dl_count)) {
189 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 190 put_nfs4_file(dp->dl_file);
5b2d21c1 191 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 192 }
193}
194
195/* Remove the associated file_lock first, then remove the delegation.
196 * lease_modify() is called to remove the FS_LEASE file_lock from
197 * the i_flock list, eventually calling nfsd's lock_manager
198 * fl_release_callback.
199 */
200static void
201nfs4_close_delegation(struct nfs4_delegation *dp)
202{
203 struct file *filp = dp->dl_vfs_file;
204
205 dprintk("NFSD: close_delegation dp %p\n",dp);
206 dp->dl_vfs_file = NULL;
207 /* The following nfsd_close may not actually close the file,
208 * but we want to remove the lease in any case. */
c907132d
N		 209 if (dp->dl_flock)
210 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 211 nfsd_close(filp);
1da177e4
LT		 212}
213
214/* Called under the state lock. */
215static void
216unhash_delegation(struct nfs4_delegation *dp)
217{
ea1da636
N		 218 list_del_init(&dp->dl_perfile);
219 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 220 spin_lock(&recall_lock);
221 list_del_init(&dp->dl_recall_lru);
222 spin_unlock(&recall_lock);
223 nfs4_close_delegation(dp);
224 nfs4_put_delegation(dp);
225}
226
227/*
228 * SETCLIENTID state
229 */
230
231/* Hash tables for nfs4_clientid state */
232#define CLIENT_HASH_BITS 4
233#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
234#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
235
236#define clientid_hashval(id) \
237 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 238#define clientstr_hashval(name) \
239 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 240/*
241 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
242 * used in reboot/reset lease grace period processing
243 *
244 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
245 * setclientid_confirmed info.
246 *
247 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
248 * setclientid info.
249 *
250 * client_lru holds client queue ordered by nfs4_client.cl_time
251 * for lease renewal.
252 *
253 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
254 * for last close replay.
255 */
256static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
257static int reclaim_str_hashtbl_size = 0;
258static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
259static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
260static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
261static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
262static struct list_head client_lru;
263static struct list_head close_lru;
264
265static inline void
266renew_client(struct nfs4_client *clp)
267{
268 /*
269 * Move client to the end to the LRU list.
270 */
271 dprintk("renewing client (clientid %08x/%08x)\n",
272 clp->cl_clientid.cl_boot,
273 clp->cl_clientid.cl_id);
274 list_move_tail(&clp->cl_lru, &client_lru);
275 clp->cl_time = get_seconds();
276}
277
278/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
279static int
280STALE_CLIENTID(clientid_t *clid)
281{
282 if (clid->cl_boot == boot_time)
283 return 0;
284 dprintk("NFSD stale clientid (%08x/%08x)\n",
285 clid->cl_boot, clid->cl_id);
286 return 1;
287}
288
289/*
290 * XXX Should we use a slab cache ?
291 * This type of memory management is somewhat inefficient, but we use it
292 * anyway since SETCLIENTID is not a common operation.
293 */
294static inline struct nfs4_client *
295alloc_client(struct xdr_netobj name)
296{
297 struct nfs4_client *clp;
298
299 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
300 memset(clp, 0, sizeof(*clp));
301 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
302 memcpy(clp->cl_name.data, name.data, name.len);
303 clp->cl_name.len = name.len;
304 }
305 else {
306 kfree(clp);
307 clp = NULL;
308 }
309 }
310 return clp;
311}
312
313static inline void
314free_client(struct nfs4_client *clp)
315{
316 if (clp->cl_cred.cr_group_info)
317 put_group_info(clp->cl_cred.cr_group_info);
318 kfree(clp->cl_name.data);
319 kfree(clp);
320}
321
322void
323put_nfs4_client(struct nfs4_client *clp)
324{
325 if (atomic_dec_and_test(&clp->cl_count))
326 free_client(clp);
327}
328
329static void
330expire_client(struct nfs4_client *clp)
331{
332 struct nfs4_stateowner *sop;
333 struct nfs4_delegation *dp;
334 struct nfs4_callback *cb = &clp->cl_callback;
335 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
336 struct list_head reaplist;
337
338 dprintk("NFSD: expire_client cl_count %d\n",
339 atomic_read(&clp->cl_count));
340
341 /* shutdown rpc client, ending any outstanding recall rpcs */
342 if (atomic_read(&cb->cb_set) == 1 && clnt) {
343 rpc_shutdown_client(clnt);
344 clnt = clp->cl_callback.cb_client = NULL;
345 }
346
347 INIT_LIST_HEAD(&reaplist);
348 spin_lock(&recall_lock);
ea1da636
N		 349 while (!list_empty(&clp->cl_delegations)) {
350 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1da177e4
LT		 351 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
352 dp->dl_flock);
ea1da636 353 list_del_init(&dp->dl_perclnt);
1da177e4
LT		 354 list_move(&dp->dl_recall_lru, &reaplist);
355 }
356 spin_unlock(&recall_lock);
357 while (!list_empty(&reaplist)) {
358 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
359 list_del_init(&dp->dl_recall_lru);
360 unhash_delegation(dp);
361 }
362 list_del(&clp->cl_idhash);
363 list_del(&clp->cl_strhash);
364 list_del(&clp->cl_lru);
ea1da636
N		 365 while (!list_empty(&clp->cl_openowners)) {
366 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
1da177e4
LT		 367 release_stateowner(sop);
368 }
369 put_nfs4_client(clp);
370}
371
372static struct nfs4_client *
a55370a3 373create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 374 struct nfs4_client *clp;
375
376 if (!(clp = alloc_client(name)))
377 goto out;
a55370a3 378 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 379 atomic_set(&clp->cl_count, 1);
380 atomic_set(&clp->cl_callback.cb_set, 0);
1da177e4
LT		 381 INIT_LIST_HEAD(&clp->cl_idhash);
382 INIT_LIST_HEAD(&clp->cl_strhash);
ea1da636
N		 383 INIT_LIST_HEAD(&clp->cl_openowners);
384 INIT_LIST_HEAD(&clp->cl_delegations);
1da177e4
LT		 385 INIT_LIST_HEAD(&clp->cl_lru);
386out:
387 return clp;
388}
389
390static void
391copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
392 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
393}
394
395static void
396copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
397 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
398 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
399}
400
401static void
402copy_cred(struct svc_cred *target, struct svc_cred *source) {
403
404 target->cr_uid = source->cr_uid;
405 target->cr_gid = source->cr_gid;
406 target->cr_group_info = source->cr_group_info;
407 get_group_info(target->cr_group_info);
408}
409
a55370a3
N		 410static inline int
411same_name(const char *n1, const char *n2) {
412 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 413}
414
415static int
416cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
417 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
418}
419
420static int
421cmp_clid(clientid_t * cl1, clientid_t * cl2) {
422 return((cl1->cl_boot == cl2->cl_boot) &&
423 (cl1->cl_id == cl2->cl_id));
424}
425
426/* XXX what about NGROUP */
427static int
428cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
429 return(cr1->cr_uid == cr2->cr_uid);
430
431}
432
433static void
434gen_clid(struct nfs4_client *clp) {
435 clp->cl_clientid.cl_boot = boot_time;
436 clp->cl_clientid.cl_id = current_clientid++;
437}
438
439static void
440gen_confirm(struct nfs4_client *clp) {
441 struct timespec tv;
442 u32 * p;
443
444 tv = CURRENT_TIME;
445 p = (u32 *)clp->cl_confirm.data;
446 *p++ = tv.tv_sec;
447 *p++ = tv.tv_nsec;
448}
449
450static int
451check_name(struct xdr_netobj name) {
452
453 if (name.len == 0)
454 return 0;
455 if (name.len > NFS4_OPAQUE_LIMIT) {
456 printk("NFSD: check_name: name too long(%d)!\n", name.len);
457 return 0;
458 }
459 return 1;
460}
461
fd39ca9a 462static void
1da177e4
LT		 463add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
464{
465 unsigned int idhashval;
466
467 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
468 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
469 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
470 list_add_tail(&clp->cl_lru, &client_lru);
471 clp->cl_time = get_seconds();
472}
473
fd39ca9a 474static void
1da177e4
LT		 475move_to_confirmed(struct nfs4_client *clp)
476{
477 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
478 unsigned int strhashval;
479
480 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
481 list_del_init(&clp->cl_strhash);
482 list_del_init(&clp->cl_idhash);
483 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 484 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 485 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
486 renew_client(clp);
487}
488
489static struct nfs4_client *
490find_confirmed_client(clientid_t *clid)
491{
492 struct nfs4_client *clp;
493 unsigned int idhashval = clientid_hashval(clid->cl_id);
494
495 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
496 if (cmp_clid(&clp->cl_clientid, clid))
497 return clp;
498 }
499 return NULL;
500}
501
502static struct nfs4_client *
503find_unconfirmed_client(clientid_t *clid)
504{
505 struct nfs4_client *clp;
506 unsigned int idhashval = clientid_hashval(clid->cl_id);
507
508 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
509 if (cmp_clid(&clp->cl_clientid, clid))
510 return clp;
511 }
512 return NULL;
513}
514
28ce6054
N		 515static struct nfs4_client *
516find_confirmed_client_by_str(const char *dname, unsigned int hashval)
517{
518 struct nfs4_client *clp;
519
520 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
521 if (same_name(clp->cl_recdir, dname))
522 return clp;
523 }
524 return NULL;
525}
526
527static struct nfs4_client *
528find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
529{
530 struct nfs4_client *clp;
531
532 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
533 if (same_name(clp->cl_recdir, dname))
534 return clp;
535 }
536 return NULL;
537}
538
1da177e4
LT		 539/* a helper function for parse_callback */
540static int
541parse_octet(unsigned int *lenp, char **addrp)
542{
543 unsigned int len = *lenp;
544 char *p = *addrp;
545 int n = -1;
546 char c;
547
548 for (;;) {
549 if (!len)
550 break;
551 len--;
552 c = *p++;
553 if (c == '.')
554 break;
555 if ((c < '0') || (c > '9')) {
556 n = -1;
557 break;
558 }
559 if (n < 0)
560 n = 0;
561 n = (n * 10) + (c - '0');
562 if (n > 255) {
563 n = -1;
564 break;
565 }
566 }
567 *lenp = len;
568 *addrp = p;
569 return n;
570}
571
572/* parse and set the setclientid ipv4 callback address */
fd39ca9a 573static int
1da177e4
LT		 574parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
575{
576 int temp = 0;
577 u32 cbaddr = 0;
578 u16 cbport = 0;
579 u32 addrlen = addr_len;
580 char *addr = addr_val;
581 int i, shift;
582
583 /* ipaddress */
584 shift = 24;
585 for(i = 4; i > 0 ; i--) {
586 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
587 return 0;
588 }
589 cbaddr |= (temp << shift);
590 if (shift > 0)
591 shift -= 8;
592 }
593 *cbaddrp = cbaddr;
594
595 /* port */
596 shift = 8;
597 for(i = 2; i > 0 ; i--) {
598 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
599 return 0;
600 }
601 cbport |= (temp << shift);
602 if (shift > 0)
603 shift -= 8;
604 }
605 *cbportp = cbport;
606 return 1;
607}
608
fd39ca9a 609static void
1da177e4
LT		 610gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
611{
612 struct nfs4_callback *cb = &clp->cl_callback;
613
614 /* Currently, we only support tcp for the callback channel */
615 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
616 goto out_err;
617
618 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
619 &cb->cb_addr, &cb->cb_port)))
620 goto out_err;
621 cb->cb_prog = se->se_callback_prog;
622 cb->cb_ident = se->se_callback_ident;
1da177e4
LT		 623 return;
624out_err:
625 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
626 "will not receive delegations\n",
627 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
628
1da177e4
LT		 629 return;
630}
631
632/*
633 * RFC 3010 has a complex implmentation description of processing a
634 * SETCLIENTID request consisting of 5 bullets, labeled as
635 * CASE0 - CASE4 below.
636 *
637 * NOTES:
638 * callback information will be processed in a future patch
639 *
640 * an unconfirmed record is added when:
641 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
642 * CASE 1: confirmed record found with matching name, principal,
643 * verifier, and clientid.
644 * CASE 2: confirmed record found with matching name, principal,
645 * and there is no unconfirmed record with matching
646 * name and principal
647 *
648 * an unconfirmed record is replaced when:
649 * CASE 3: confirmed record found with matching name, principal,
650 * and an unconfirmed record is found with matching
651 * name, principal, and with clientid and
652 * confirm that does not match the confirmed record.
653 * CASE 4: there is no confirmed record with matching name and
654 * principal. there is an unconfirmed record with
655 * matching name, principal.
656 *
657 * an unconfirmed record is deleted when:
658 * CASE 1: an unconfirmed record that matches input name, verifier,
659 * and confirmed clientid.
660 * CASE 4: any unconfirmed records with matching name and principal
661 * that exist after an unconfirmed record has been replaced
662 * as described above.
663 *
664 */
665int
666nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
667{
668 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
669 struct xdr_netobj clname = {
670 .len = setclid->se_namelen,
671 .data = setclid->se_name,
672 };
673 nfs4_verifier clverifier = setclid->se_verf;
674 unsigned int strhashval;
28ce6054 675 struct nfs4_client *conf, *unconf, *new;
1da177e4 676 int status;
a55370a3 677 char dname[HEXDIR_LEN];
1da177e4
LT		 678
679 status = nfserr_inval;
680 if (!check_name(clname))
681 goto out;
682
a55370a3
N		 683 status = nfs4_make_rec_clidname(dname, &clname);
684 if (status)
685 goto out;
686
1da177e4
LT		 687 /*
688 * XXX The Duplicate Request Cache (DRC) has been checked (??)
689 * We get here on a DRC miss.
690 */
691
a55370a3 692 strhashval = clientstr_hashval(dname);
1da177e4 693
1da177e4 694 nfs4_lock_state();
28ce6054
N		 695 conf = find_confirmed_client_by_str(dname, strhashval);
696 if (conf) {
1da177e4
LT		 697 /*
698 * CASE 0:
699 * clname match, confirmed, different principal
700 * or different ip_address
701 */
702 status = nfserr_clid_inuse;
28ce6054
N		 703 if (!cmp_creds(&conf->cl_cred, &rqstp->rq_cred)
704 || conf->cl_addr != ip_addr) {
1da177e4
LT		 705 printk("NFSD: setclientid: string in use by client"
706 "(clientid %08x/%08x)\n",
28ce6054 707 conf->cl_clientid.cl_boot, conf->cl_clientid.cl_id);
1da177e4
LT		 708 goto out;
709 }
1da177e4 710 }
28ce6054 711 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1da177e4
LT		 712 status = nfserr_resource;
713 if (!conf) {
714 /*
715 * CASE 4:
716 * placed first, because it is the normal case.
717 */
718 if (unconf)
719 expire_client(unconf);
a55370a3
N		 720 new = create_client(clname, dname);
721 if (new == NULL)
1da177e4
LT		 722 goto out;
723 copy_verf(new, &clverifier);
724 new->cl_addr = ip_addr;
725 copy_cred(&new->cl_cred,&rqstp->rq_cred);
726 gen_clid(new);
727 gen_confirm(new);
728 gen_callback(new, setclid);
729 add_to_unconfirmed(new, strhashval);
730 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
731 /*
732 * CASE 1:
733 * cl_name match, confirmed, principal match
734 * verifier match: probable callback update
735 *
736 * remove any unconfirmed nfs4_client with
737 * matching cl_name, cl_verifier, and cl_clientid
738 *
739 * create and insert an unconfirmed nfs4_client with same
740 * cl_name, cl_verifier, and cl_clientid as existing
741 * nfs4_client, but with the new callback info and a
742 * new cl_confirm
743 */
31f4a6c1
N		 744 if (unconf) {
745 /* Note this is removing unconfirmed {*x***},
746 * which is stronger than RFC recommended {vxc**}.
747 * This has the advantage that there is at most
748 * one {*x***} in either list at any time.
749 */
750 expire_client(unconf);
1da177e4 751 }
a55370a3
N		 752 new = create_client(clname, dname);
753 if (new == NULL)
1da177e4
LT		 754 goto out;
755 copy_verf(new,&conf->cl_verifier);
756 new->cl_addr = ip_addr;
757 copy_cred(&new->cl_cred,&rqstp->rq_cred);
758 copy_clid(new, conf);
759 gen_confirm(new);
760 gen_callback(new, setclid);
761 add_to_unconfirmed(new,strhashval);
762 } else if (!unconf) {
763 /*
764 * CASE 2:
765 * clname match, confirmed, principal match
766 * verfier does not match
767 * no unconfirmed. create a new unconfirmed nfs4_client
768 * using input clverifier, clname, and callback info
769 * and generate a new cl_clientid and cl_confirm.
770 */
a55370a3
N		 771 new = create_client(clname, dname);
772 if (new == NULL)
1da177e4
LT		 773 goto out;
774 copy_verf(new,&clverifier);
775 new->cl_addr = ip_addr;
776 copy_cred(&new->cl_cred,&rqstp->rq_cred);
777 gen_clid(new);
778 gen_confirm(new);
779 gen_callback(new, setclid);
780 add_to_unconfirmed(new, strhashval);
781 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
782 /*
783 * CASE3:
784 * confirmed found (name, principal match)
785 * confirmed verifier does not match input clverifier
786 *
787 * unconfirmed found (name match)
788 * confirmed->cl_confirm != unconfirmed->cl_confirm
789 *
790 * remove unconfirmed.
791 *
792 * create an unconfirmed nfs4_client
793 * with same cl_name as existing confirmed nfs4_client,
794 * but with new callback info, new cl_clientid,
795 * new cl_verifier and a new cl_confirm
796 */
797 expire_client(unconf);
a55370a3
N		 798 new = create_client(clname, dname);
799 if (new == NULL)
1da177e4
LT		 800 goto out;
801 copy_verf(new,&clverifier);
802 new->cl_addr = ip_addr;
803 copy_cred(&new->cl_cred,&rqstp->rq_cred);
804 gen_clid(new);
805 gen_confirm(new);
806 gen_callback(new, setclid);
807 add_to_unconfirmed(new, strhashval);
808 } else {
809 /* No cases hit !!! */
810 status = nfserr_inval;
811 goto out;
812
813 }
814 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
815 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
816 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
817 status = nfs_ok;
818out:
819 nfs4_unlock_state();
820 return status;
821}
822
823
824/*
825 * RFC 3010 has a complex implmentation description of processing a
826 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
827 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
828 *
829 * NOTE: callback information will be processed here in a future patch
830 */
831int
832nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
833{
834 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
21ab45a4 835 struct nfs4_client *conf, *unconf;
1da177e4
LT		 836 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
837 clientid_t * clid = &setclientid_confirm->sc_clientid;
838 int status;
839
840 if (STALE_CLIENTID(clid))
841 return nfserr_stale_clientid;
842 /*
843 * XXX The Duplicate Request Cache (DRC) has been checked (??)
844 * We get here on a DRC miss.
845 */
846
847 nfs4_lock_state();
21ab45a4
N		 848
849 conf = find_confirmed_client(clid);
850 unconf = find_unconfirmed_client(clid);
851
852 status = nfserr_clid_inuse;
853 if (conf && conf->cl_addr != ip_addr)
854 goto out;
855 if (unconf && unconf->cl_addr != ip_addr)
856 goto out;
857
1da177e4
LT		 858 if ((conf && unconf) &&
859 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
860 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 861 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4 862 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
7c79f737
N		 863 /* CASE 1:
864 * unconf record that matches input clientid and input confirm.
865 * conf record that matches input clientid.
866 * conf and unconf records match names, verifiers
867 */
1da177e4
LT		 868 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
869 status = nfserr_clid_inuse;
870 else {
1a69c179
N		 871 /* XXX: We just turn off callbacks until we can handle
872 * change request correctly. */
cb36d634 873 atomic_set(&conf->cl_callback.cb_set, 0);
21ab45a4 874 gen_confirm(conf);
1a69c179 875 expire_client(unconf);
1da177e4 876 status = nfs_ok;
1a69c179 877
1da177e4 878 }
7c79f737 879 } else if ((conf && !unconf) ||
1da177e4
LT		 880 ((conf && unconf) &&
881 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 882 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
7c79f737
N		 883 /* CASE 2:
884 * conf record that matches input clientid.
885 * if unconf record matches input clientid, then
886 * unconf->cl_name or unconf->cl_verifier don't match the
887 * conf record.
888 */
21ab45a4 889 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred))
1da177e4 890 status = nfserr_clid_inuse;
21ab45a4 891 else
1da177e4 892 status = nfs_ok;
7c79f737
N		 893 } else if (!conf && unconf
894 && cmp_verf(&unconf->cl_confirm, &confirm)) {
895 /* CASE 3:
896 * conf record not found.
897 * unconf record found.
898 * unconf->cl_confirm matches input confirm
899 */
1da177e4
LT		 900 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
901 status = nfserr_clid_inuse;
902 } else {
1a69c179
N		 903 unsigned int hash =
904 clientstr_hashval(unconf->cl_recdir);
905 conf = find_confirmed_client_by_str(unconf->cl_recdir,
906 hash);
907 if (conf) {
908 expire_client(conf);
909 }
1da177e4 910 move_to_confirmed(unconf);
21ab45a4 911 conf = unconf;
1a69c179 912 status = nfs_ok;
1da177e4 913 }
7c79f737
N		 914 } else if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm)))
915 && (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm,
916 &confirm)))) {
917 /* CASE 4:
918 * conf record not found, or if conf, conf->cl_confirm does not
919 * match input confirm.
920 * unconf record not found, or if unconf, unconf->cl_confirm
921 * does not match input confirm.
922 */
1da177e4 923 status = nfserr_stale_clientid;
7c79f737 924 } else {
08e8987c
N		 925 /* check that we have hit one of the cases...*/
926 status = nfserr_clid_inuse;
927 }
1da177e4
LT		 928out:
929 if (!status)
21ab45a4 930 nfsd4_probe_callback(conf);
1da177e4
LT		 931 nfs4_unlock_state();
932 return status;
933}
934
935/*
936 * Open owner state (share locks)
937 */
938
939/* hash tables for nfs4_stateowner */
940#define OWNER_HASH_BITS 8
941#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
942#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
943
944#define ownerid_hashval(id) \
945 ((id) & OWNER_HASH_MASK)
946#define ownerstr_hashval(clientid, ownername) \
947 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
948
949static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
950static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
951
952/* hash table for nfs4_file */
953#define FILE_HASH_BITS 8
954#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
955#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
956/* hash table for (open)nfs4_stateid */
957#define STATEID_HASH_BITS 10
958#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
959#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
960
961#define file_hashval(x) \
962 hash_ptr(x, FILE_HASH_BITS)
963#define stateid_hashval(owner_id, file_id) \
964 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
965
966static struct list_head file_hashtbl[FILE_HASH_SIZE];
967static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
968
969/* OPEN Share state helper functions */
970static inline struct nfs4_file *
971alloc_init_file(struct inode *ino)
972{
973 struct nfs4_file *fp;
974 unsigned int hashval = file_hashval(ino);
975
e60d4398
N		 976 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
977 if (fp) {
13cd2184 978 kref_init(&fp->fi_ref);
1da177e4 979 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 980 INIT_LIST_HEAD(&fp->fi_stateids);
981 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 982 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
983 fp->fi_inode = igrab(ino);
984 fp->fi_id = current_fileid++;
1da177e4
LT		 985 return fp;
986 }
987 return NULL;
988}
989
e60d4398
N		 990static void
991nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 992{
e60d4398
N		 993 int status;
994
995 if (*slab == NULL)
996 return;
997 status = kmem_cache_destroy(*slab);
998 *slab = NULL;
999 WARN_ON(status);
1da177e4
LT		 1000}
1001
1002static void
1003nfsd4_free_slabs(void)
1004{
e60d4398
N		 1005 nfsd4_free_slab(&stateowner_slab);
1006 nfsd4_free_slab(&file_slab);
5ac049ac 1007 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1008 nfsd4_free_slab(&deleg_slab);
e60d4398 1009}
1da177e4 1010
e60d4398
N		 1011static int
1012nfsd4_init_slabs(void)
1013{
1014 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1015 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1016 if (stateowner_slab == NULL)
1017 goto out_nomem;
1018 file_slab = kmem_cache_create("nfsd4_files",
1019 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1020 if (file_slab == NULL)
1021 goto out_nomem;
5ac049ac
N		 1022 stateid_slab = kmem_cache_create("nfsd4_stateids",
1023 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1024 if (stateid_slab == NULL)
1025 goto out_nomem;
5b2d21c1
N		 1026 deleg_slab = kmem_cache_create("nfsd4_delegations",
1027 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1028 if (deleg_slab == NULL)
1029 goto out_nomem;
e60d4398
N		 1030 return 0;
1031out_nomem:
1032 nfsd4_free_slabs();
1033 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1034 return -ENOMEM;
1da177e4
LT		 1035}
1036
1037void
1038nfs4_free_stateowner(struct kref *kref)
1039{
1040 struct nfs4_stateowner *sop =
1041 container_of(kref, struct nfs4_stateowner, so_ref);
1042 kfree(sop->so_owner.data);
1043 kmem_cache_free(stateowner_slab, sop);
1044}
1045
1046static inline struct nfs4_stateowner *
1047alloc_stateowner(struct xdr_netobj *owner)
1048{
1049 struct nfs4_stateowner *sop;
1050
1051 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1052 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1053 memcpy(sop->so_owner.data, owner->data, owner->len);
1054 sop->so_owner.len = owner->len;
1055 kref_init(&sop->so_ref);
1056 return sop;
1057 }
1058 kmem_cache_free(stateowner_slab, sop);
1059 }
1060 return NULL;
1061}
1062
1063static struct nfs4_stateowner *
1064alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1065 struct nfs4_stateowner *sop;
1066 struct nfs4_replay *rp;
1067 unsigned int idhashval;
1068
1069 if (!(sop = alloc_stateowner(&open->op_owner)))
1070 return NULL;
1071 idhashval = ownerid_hashval(current_ownerid);
1072 INIT_LIST_HEAD(&sop->so_idhash);
1073 INIT_LIST_HEAD(&sop->so_strhash);
1074 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 1075 INIT_LIST_HEAD(&sop->so_stateids);
1076 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1da177e4
LT		 1077 INIT_LIST_HEAD(&sop->so_close_lru);
1078 sop->so_time = 0;
1079 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1080 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
ea1da636 1081 list_add(&sop->so_perclient, &clp->cl_openowners);
1da177e4
LT		 1082 sop->so_is_open_owner = 1;
1083 sop->so_id = current_ownerid++;
1084 sop->so_client = clp;
1085 sop->so_seqid = open->op_seqid;
1086 sop->so_confirmed = 0;
1087 rp = &sop->so_replay;
1088 rp->rp_status = NFSERR_SERVERFAULT;
1089 rp->rp_buflen = 0;
1090 rp->rp_buf = rp->rp_ibuf;
1091 return sop;
1092}
1093
1094static void
1095release_stateid_lockowners(struct nfs4_stateid *open_stp)
1096{
1097 struct nfs4_stateowner *lock_sop;
1098
ea1da636
N		 1099 while (!list_empty(&open_stp->st_lockowners)) {
1100 lock_sop = list_entry(open_stp->st_lockowners.next,
1101 struct nfs4_stateowner, so_perstateid);
1102 /* list_del(&open_stp->st_lockowners); */
1da177e4
LT		 1103 BUG_ON(lock_sop->so_is_open_owner);
1104 release_stateowner(lock_sop);
1105 }
1106}
1107
1108static void
1109unhash_stateowner(struct nfs4_stateowner *sop)
1110{
1111 struct nfs4_stateid *stp;
1112
1113 list_del(&sop->so_idhash);
1114 list_del(&sop->so_strhash);
6fa305de 1115 if (sop->so_is_open_owner)
1da177e4 1116 list_del(&sop->so_perclient);
ea1da636
N		 1117 list_del(&sop->so_perstateid);
1118 while (!list_empty(&sop->so_stateids)) {
1119 stp = list_entry(sop->so_stateids.next,
1120 struct nfs4_stateid, st_perstateowner);
1da177e4
LT		 1121 if (sop->so_is_open_owner)
1122 release_stateid(stp, OPEN_STATE);
1123 else
1124 release_stateid(stp, LOCK_STATE);
1125 }
1126}
1127
1128static void
1129release_stateowner(struct nfs4_stateowner *sop)
1130{
1131 unhash_stateowner(sop);
1132 list_del(&sop->so_close_lru);
1133 nfs4_put_stateowner(sop);
1134}
1135
1136static inline void
1137init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1138 struct nfs4_stateowner *sop = open->op_stateowner;
1139 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1140
1141 INIT_LIST_HEAD(&stp->st_hash);
ea1da636
N		 1142 INIT_LIST_HEAD(&stp->st_perstateowner);
1143 INIT_LIST_HEAD(&stp->st_lockowners);
1da177e4
LT		 1144 INIT_LIST_HEAD(&stp->st_perfile);
1145 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
ea1da636 1146 list_add(&stp->st_perstateowner, &sop->so_stateids);
8beefa24 1147 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1148 stp->st_stateowner = sop;
13cd2184 1149 get_nfs4_file(fp);
1da177e4
LT		 1150 stp->st_file = fp;
1151 stp->st_stateid.si_boot = boot_time;
1152 stp->st_stateid.si_stateownerid = sop->so_id;
1153 stp->st_stateid.si_fileid = fp->fi_id;
1154 stp->st_stateid.si_generation = 0;
1155 stp->st_access_bmap = 0;
1156 stp->st_deny_bmap = 0;
1157 __set_bit(open->op_share_access, &stp->st_access_bmap);
1158 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1159}
1160
1161static void
1162release_stateid(struct nfs4_stateid *stp, int flags)
1163{
1164 struct file *filp = stp->st_vfs_file;
1165
1166 list_del(&stp->st_hash);
1da177e4 1167 list_del(&stp->st_perfile);
ea1da636 1168 list_del(&stp->st_perstateowner);
1da177e4
LT		 1169 if (flags & OPEN_STATE) {
1170 release_stateid_lockowners(stp);
1171 stp->st_vfs_file = NULL;
1172 nfsd_close(filp);
1da177e4
LT		 1173 } else if (flags & LOCK_STATE)
1174 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1175 put_nfs4_file(stp->st_file);
5ac049ac 1176 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1177 stp = NULL;
1178}
1179
fd39ca9a 1180static void
1da177e4
LT		 1181move_to_close_lru(struct nfs4_stateowner *sop)
1182{
1183 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1184
1185 unhash_stateowner(sop);
1186 list_add_tail(&sop->so_close_lru, &close_lru);
1187 sop->so_time = get_seconds();
1188}
1189
fd39ca9a 1190static void
1da177e4
LT		 1191release_state_owner(struct nfs4_stateid *stp, int flag)
1192{
1193 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1194
1195 dprintk("NFSD: release_state_owner\n");
1196 release_stateid(stp, flag);
1197
1198 /* place unused nfs4_stateowners on so_close_lru list to be
1199 * released by the laundromat service after the lease period
1200 * to enable us to handle CLOSE replay
1201 */
ea1da636 1202 if (sop->so_confirmed && list_empty(&sop->so_stateids))
1da177e4 1203 move_to_close_lru(sop);
1da177e4
LT		 1204}
1205
1206static int
1207cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1208 return ((sop->so_owner.len == owner->len) &&
1209 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1210 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1211}
1212
1213static struct nfs4_stateowner *
1214find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1215{
1216 struct nfs4_stateowner *so = NULL;
1217
1218 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1219 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1220 return so;
1221 }
1222 return NULL;
1223}
1224
1225/* search file_hashtbl[] for file */
1226static struct nfs4_file *
1227find_file(struct inode *ino)
1228{
1229 unsigned int hashval = file_hashval(ino);
1230 struct nfs4_file *fp;
1231
1232 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1233 if (fp->fi_inode == ino) {
1234 get_nfs4_file(fp);
1da177e4 1235 return fp;
13cd2184 1236 }
1da177e4
LT		 1237 }
1238 return NULL;
1239}
1240
1241#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1242#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1243
fd39ca9a 1244static void
1da177e4
LT		 1245set_access(unsigned int *access, unsigned long bmap) {
1246 int i;
1247
1248 *access = 0;
1249 for (i = 1; i < 4; i++) {
1250 if (test_bit(i, &bmap))
1251 *access |= i;
1252 }
1253}
1254
fd39ca9a 1255static void
1da177e4
LT		 1256set_deny(unsigned int *deny, unsigned long bmap) {
1257 int i;
1258
1259 *deny = 0;
1260 for (i = 0; i < 4; i++) {
1261 if (test_bit(i, &bmap))
1262 *deny |= i ;
1263 }
1264}
1265
1266static int
1267test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1268 unsigned int access, deny;
1269
1270 set_access(&access, stp->st_access_bmap);
1271 set_deny(&deny, stp->st_deny_bmap);
1272 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1273 return 0;
1274 return 1;
1275}
1276
1277/*
1278 * Called to check deny when READ with all zero stateid or
1279 * WRITE with all zero or all one stateid
1280 */
fd39ca9a 1281static int
1da177e4
LT		 1282nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1283{
1284 struct inode *ino = current_fh->fh_dentry->d_inode;
1285 struct nfs4_file *fp;
1286 struct nfs4_stateid *stp;
13cd2184 1287 int ret;
1da177e4
LT		 1288
1289 dprintk("NFSD: nfs4_share_conflict\n");
1290
1291 fp = find_file(ino);
13cd2184
N		 1292 if (!fp)
1293 return nfs_ok;
1294 ret = nfserr_share_denied;
1da177e4 1295 /* Search for conflicting share reservations */
13cd2184
N		 1296 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1297 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1298 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1299 goto out;
1da177e4 1300 }
13cd2184
N		 1301 ret = nfs_ok;
1302out:
1303 put_nfs4_file(fp);
1304 return ret;
1da177e4
LT		 1305}
1306
1307static inline void
1308nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1309{
1310 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1311 put_write_access(filp->f_dentry->d_inode);
1312 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1313 }
1314}
1315
1316/*
1317 * Recall a delegation
1318 */
1319static int
1320do_recall(void *__dp)
1321{
1322 struct nfs4_delegation *dp = __dp;
1323
1324 daemonize("nfsv4-recall");
1325
1326 nfsd4_cb_recall(dp);
1327 return 0;
1328}
1329
1330/*
1331 * Spawn a thread to perform a recall on the delegation represented
1332 * by the lease (file_lock)
1333 *
1334 * Called from break_lease() with lock_kernel() held.
1335 * Note: we assume break_lease will only call this *once* for any given
1336 * lease.
1337 */
1338static
1339void nfsd_break_deleg_cb(struct file_lock *fl)
1340{
1341 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1342 struct task_struct *t;
1343
1344 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1345 if (!dp)
1346 return;
1347
1348 /* We're assuming the state code never drops its reference
1349 * without first removing the lease. Since we're in this lease
1350 * callback (and since the lease code is serialized by the kernel
1351 * lock) we know the server hasn't removed the lease yet, we know
1352 * it's safe to take a reference: */
1353 atomic_inc(&dp->dl_count);
1354
1355 spin_lock(&recall_lock);
1356 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1357 spin_unlock(&recall_lock);
1358
1359 /* only place dl_time is set. protected by lock_kernel*/
1360 dp->dl_time = get_seconds();
1361
1362 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1363 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1364
1365 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1366 if (IS_ERR(t)) {
1367 struct nfs4_client *clp = dp->dl_client;
1368
1369 printk(KERN_INFO "NFSD: Callback thread failed for "
1370 "for client (clientid %08x/%08x)\n",
1371 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1372 nfs4_put_delegation(dp);
1373 }
1374}
1375
1376/*
1377 * The file_lock is being reapd.
1378 *
1379 * Called by locks_free_lock() with lock_kernel() held.
1380 */
1381static
1382void nfsd_release_deleg_cb(struct file_lock *fl)
1383{
1384 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1385
1386 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1387
1388 if (!(fl->fl_flags & FL_LEASE) || !dp)
1389 return;
1390 dp->dl_flock = NULL;
1391}
1392
1393/*
1394 * Set the delegation file_lock back pointer.
1395 *
1396 * Called from __setlease() with lock_kernel() held.
1397 */
1398static
1399void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1400{
1401 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1402
1403 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1404 if (!dp)
1405 return;
1406 dp->dl_flock = new;
1407}
1408
1409/*
1410 * Called from __setlease() with lock_kernel() held
1411 */
1412static
1413int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1414{
1415 struct nfs4_delegation *onlistd =
1416 (struct nfs4_delegation *)onlist->fl_owner;
1417 struct nfs4_delegation *tryd =
1418 (struct nfs4_delegation *)try->fl_owner;
1419
1420 if (onlist->fl_lmops != try->fl_lmops)
1421 return 0;
1422
1423 return onlistd->dl_client == tryd->dl_client;
1424}
1425
1426
1427static
1428int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1429{
1430 if (arg & F_UNLCK)
1431 return lease_modify(onlist, arg);
1432 else
1433 return -EAGAIN;
1434}
1435
fd39ca9a 1436static struct lock_manager_operations nfsd_lease_mng_ops = {
1da177e4
LT		 1437 .fl_break = nfsd_break_deleg_cb,
1438 .fl_release_private = nfsd_release_deleg_cb,
1439 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1440 .fl_mylease = nfsd_same_client_deleg_cb,
1441 .fl_change = nfsd_change_deleg_cb,
1442};
1443
1444
1445/*
1446 * nfsd4_process_open1()
1447 * lookup stateowner.
1448 * found:
1449 * check confirmed
1450 * confirmed:
1451 * check seqid
1452 * not confirmed:
1453 * delete owner
1454 * create new owner
1455 * notfound:
1456 * verify clientid
1457 * create new owner
1458 *
1459 * called with nfs4_lock_state() held.
1460 */
1461int
1462nfsd4_process_open1(struct nfsd4_open *open)
1463{
1464 int status;
1465 clientid_t *clientid = &open->op_clientid;
1466 struct nfs4_client *clp = NULL;
1467 unsigned int strhashval;
1468 struct nfs4_stateowner *sop = NULL;
1469
1470 status = nfserr_inval;
1471 if (!check_name(open->op_owner))
1472 goto out;
1473
1474 if (STALE_CLIENTID(&open->op_clientid))
1475 return nfserr_stale_clientid;
1476
1477 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1478 sop = find_openstateowner_str(strhashval, open);
1479 if (sop) {
1480 open->op_stateowner = sop;
1481 /* check for replay */
1482 if (open->op_seqid == sop->so_seqid){
1483 if (sop->so_replay.rp_buflen)
1484 return NFSERR_REPLAY_ME;
1485 else {
1486 /* The original OPEN failed so spectacularly
1487 * that we don't even have replay data saved!
1488 * Therefore, we have no choice but to continue
1489 * processing this OPEN; presumably, we'll
1490 * fail again for the same reason.
1491 */
1492 dprintk("nfsd4_process_open1:"
1493 " replay with no replay cache\n");
1494 goto renew;
1495 }
1496 } else if (sop->so_confirmed) {
1497 if (open->op_seqid == sop->so_seqid + 1)
1498 goto renew;
1499 status = nfserr_bad_seqid;
1500 goto out;
1501 } else {
1502 /* If we get here, we received an OPEN for an
1503 * unconfirmed nfs4_stateowner. Since the seqid's are
1504 * different, purge the existing nfs4_stateowner, and
1505 * instantiate a new one.
1506 */
1507 clp = sop->so_client;
1508 release_stateowner(sop);
1509 }
1510 } else {
1511 /* nfs4_stateowner not found.
1512 * Verify clientid and instantiate new nfs4_stateowner.
1513 * If verify fails this is presumably the result of the
1514 * client's lease expiring.
1515 */
1516 status = nfserr_expired;
1517 clp = find_confirmed_client(clientid);
1518 if (clp == NULL)
1519 goto out;
1520 }
1521 status = nfserr_resource;
1522 sop = alloc_init_open_stateowner(strhashval, clp, open);
1523 if (sop == NULL)
1524 goto out;
1525 open->op_stateowner = sop;
1526renew:
1527 status = nfs_ok;
1528 renew_client(sop->so_client);
1529out:
1530 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1531 status = nfserr_reclaim_bad;
1532 return status;
1533}
1534
4a6e43e6
N		 1535static inline int
1536nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1537{
1538 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1539 return nfserr_openmode;
1540 else
1541 return nfs_ok;
1542}
1543
52f4fb43
N		 1544static struct nfs4_delegation *
1545find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1546{
1547 struct nfs4_delegation *dp;
1548
ea1da636 1549 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
52f4fb43
N		 1550 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1551 return dp;
1552 }
1553 return NULL;
1554}
1555
c44c5eeb 1556static int
567d9829
N		 1557nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1558 struct nfs4_delegation **dp)
1559{
1560 int flags;
c44c5eeb 1561 int status = nfserr_bad_stateid;
567d9829
N		 1562
1563 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1564 if (*dp == NULL)
c44c5eeb 1565 goto out;
567d9829
N		 1566 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1567 RD_STATE : WR_STATE;
1568 status = nfs4_check_delegmode(*dp, flags);
1569 if (status)
1570 *dp = NULL;
c44c5eeb
N		 1571out:
1572 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1573 return nfs_ok;
1574 if (status)
1575 return status;
1576 open->op_stateowner->so_confirmed = 1;
1577 return nfs_ok;
567d9829
N		 1578}
1579
1da177e4
LT		 1580static int
1581nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1582{
1583 struct nfs4_stateid *local;
1584 int status = nfserr_share_denied;
1585 struct nfs4_stateowner *sop = open->op_stateowner;
1586
8beefa24 1587 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1588 /* ignore lock owners */
1589 if (local->st_stateowner->so_is_open_owner == 0)
1590 continue;
1591 /* remember if we have seen this open owner */
1592 if (local->st_stateowner == sop)
1593 *stpp = local;
1594 /* check for conflicting share reservations */
1595 if (!test_share(local, open))
1596 goto out;
1597 }
1598 status = 0;
1599out:
1600 return status;
1601}
1602
5ac049ac
N		 1603static inline struct nfs4_stateid *
1604nfs4_alloc_stateid(void)
1605{
1606 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1607}
1608
1da177e4
LT		 1609static int
1610nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1611 struct nfs4_delegation *dp,
1da177e4
LT		 1612 struct svc_fh *cur_fh, int flags)
1613{
1614 struct nfs4_stateid *stp;
1da177e4 1615
5ac049ac 1616 stp = nfs4_alloc_stateid();
1da177e4
LT		 1617 if (stp == NULL)
1618 return nfserr_resource;
1619
567d9829
N		 1620 if (dp) {
1621 get_file(dp->dl_vfs_file);
1622 stp->st_vfs_file = dp->dl_vfs_file;
1623 } else {
1624 int status;
1625 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1626 &stp->st_vfs_file);
1627 if (status) {
1628 if (status == nfserr_dropit)
1629 status = nfserr_jukebox;
5ac049ac 1630 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1631 return status;
1632 }
1da177e4 1633 }
1da177e4
LT		 1634 *stpp = stp;
1635 return 0;
1636}
1637
1638static inline int
1639nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1640 struct nfsd4_open *open)
1641{
1642 struct iattr iattr = {
1643 .ia_valid = ATTR_SIZE,
1644 .ia_size = 0,
1645 };
1646 if (!open->op_truncate)
1647 return 0;
1648 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1649 return -EINVAL;
1650 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1651}
1652
1653static int
1654nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1655{
1656 struct file *filp = stp->st_vfs_file;
1657 struct inode *inode = filp->f_dentry->d_inode;
1658 unsigned int share_access;
1659 int status;
1660
1661 set_access(&share_access, stp->st_access_bmap);
1662 share_access = ~share_access;
1663 share_access &= open->op_share_access;
1664
1665 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1666 return nfsd4_truncate(rqstp, cur_fh, open);
1667
1668 status = get_write_access(inode);
1669 if (status)
1670 return nfserrno(status);
1671 status = nfsd4_truncate(rqstp, cur_fh, open);
1672 if (status) {
1673 put_write_access(inode);
1674 return status;
1675 }
1676 /* remember the open */
1677 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1678 set_bit(open->op_share_access, &stp->st_access_bmap);
1679 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1680
1681 return nfs_ok;
1682}
1683
1684
1685/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1686static void
1687nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1688{
1689 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1690 if (*status)
1691 *status = nfserr_reclaim_bad;
1692 else {
1693 open->op_stateowner->so_confirmed = 1;
1694 open->op_stateowner->so_seqid--;
1695 }
1696 }
1697}
1698
1699/*
1700 * Attempt to hand out a delegation.
1701 */
1702static void
1703nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1704{
1705 struct nfs4_delegation *dp;
1706 struct nfs4_stateowner *sop = stp->st_stateowner;
1707 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1708 struct file_lock fl, *flp = &fl;
1709 int status, flag = 0;
1710
1711 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1712 open->op_recall = 0;
1713 switch (open->op_claim_type) {
1714 case NFS4_OPEN_CLAIM_PREVIOUS:
1715 if (!atomic_read(&cb->cb_set))
1716 open->op_recall = 1;
1717 flag = open->op_delegate_type;
1718 if (flag == NFS4_OPEN_DELEGATE_NONE)
1719 goto out;
1720 break;
1721 case NFS4_OPEN_CLAIM_NULL:
1722 /* Let's not give out any delegations till everyone's
1723 * had the chance to reclaim theirs.... */
1724 if (nfs4_in_grace())
1725 goto out;
1726 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1727 goto out;
1728 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1729 flag = NFS4_OPEN_DELEGATE_WRITE;
1730 else
1731 flag = NFS4_OPEN_DELEGATE_READ;
1732 break;
1733 default:
1734 goto out;
1735 }
1da177e4
LT		 1736
1737 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1738 if (dp == NULL) {
1739 flag = NFS4_OPEN_DELEGATE_NONE;
1740 goto out;
1741 }
1742 locks_init_lock(&fl);
1743 fl.fl_lmops = &nfsd_lease_mng_ops;
1744 fl.fl_flags = FL_LEASE;
1745 fl.fl_end = OFFSET_MAX;
1746 fl.fl_owner = (fl_owner_t)dp;
1747 fl.fl_file = stp->st_vfs_file;
1748 fl.fl_pid = current->tgid;
1749
1750 /* setlease checks to see if delegation should be handed out.
1751 * the lock_manager callbacks fl_mylease and fl_change are used
1752 */
1753 if ((status = setlease(stp->st_vfs_file,
1754 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1755 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1756 unhash_delegation(dp);
1da177e4
LT		 1757 flag = NFS4_OPEN_DELEGATE_NONE;
1758 goto out;
1759 }
1760
1761 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1762
1763 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1764 dp->dl_stateid.si_boot,
1765 dp->dl_stateid.si_stateownerid,
1766 dp->dl_stateid.si_fileid,
1767 dp->dl_stateid.si_generation);
1768out:
7b190fec
N		 1769 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1770 && flag == NFS4_OPEN_DELEGATE_NONE
1771 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1772 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1773 open->op_delegate_type = flag;
1774}
1775
1776/*
1777 * called with nfs4_lock_state() held.
1778 */
1779int
1780nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1781{
1782 struct nfs4_file *fp = NULL;
1783 struct inode *ino = current_fh->fh_dentry->d_inode;
1784 struct nfs4_stateid *stp = NULL;
567d9829 1785 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1786 int status;
1787
1788 status = nfserr_inval;
1789 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1790 goto out;
1791 /*
1792 * Lookup file; if found, lookup stateid and check open request,
1793 * and check for delegations in the process of being recalled.
1794 * If not found, create the nfs4_file struct
1795 */
1796 fp = find_file(ino);
1797 if (fp) {
1798 if ((status = nfs4_check_open(fp, open, &stp)))
1799 goto out;
c44c5eeb
N		 1800 status = nfs4_check_deleg(fp, open, &dp);
1801 if (status)
1802 goto out;
1da177e4 1803 } else {
c44c5eeb
N		 1804 status = nfserr_bad_stateid;
1805 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1806 goto out;
1da177e4
LT		 1807 status = nfserr_resource;
1808 fp = alloc_init_file(ino);
1809 if (fp == NULL)
1810 goto out;
1811 }
1812
1813 /*
1814 * OPEN the file, or upgrade an existing OPEN.
1815 * If truncate fails, the OPEN fails.
1816 */
1817 if (stp) {
1818 /* Stateid was found, this is an OPEN upgrade */
1819 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1820 if (status)
1821 goto out;
1822 } else {
1823 /* Stateid was not found, this is a new OPEN */
1824 int flags = 0;
1825 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1826 flags = MAY_WRITE;
1827 else
1828 flags = MAY_READ;
567d9829
N		 1829 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1830 if (status)
1da177e4
LT		 1831 goto out;
1832 init_stateid(stp, fp, open);
1833 status = nfsd4_truncate(rqstp, current_fh, open);
1834 if (status) {
1835 release_stateid(stp, OPEN_STATE);
1836 goto out;
1837 }
1838 }
1839 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1840
1841 /*
1842 * Attempt to hand out a delegation. No error return, because the
1843 * OPEN succeeds even if we fail.
1844 */
1845 nfs4_open_delegation(current_fh, open, stp);
1846
1847 status = nfs_ok;
1848
1849 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1850 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1851 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1852out:
13cd2184
N		 1853 if (fp)
1854 put_nfs4_file(fp);
1da177e4
LT		 1855 /* CLAIM_PREVIOUS has different error returns */
1856 nfs4_set_claim_prev(open, &status);
1857 /*
1858 * To finish the open response, we just need to set the rflags.
1859 */
1860 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1861 if (!open->op_stateowner->so_confirmed)
1862 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1863
1864 return status;
1865}
1866
58da282b 1867static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1868static struct work_struct laundromat_work;
1869static void laundromat_main(void *);
1870static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1871
1872int
1873nfsd4_renew(clientid_t *clid)
1874{
1875 struct nfs4_client *clp;
1876 int status;
1877
1878 nfs4_lock_state();
1879 dprintk("process_renew(%08x/%08x): starting\n",
1880 clid->cl_boot, clid->cl_id);
1881 status = nfserr_stale_clientid;
1882 if (STALE_CLIENTID(clid))
1883 goto out;
1884 clp = find_confirmed_client(clid);
1885 status = nfserr_expired;
1886 if (clp == NULL) {
1887 /* We assume the client took too long to RENEW. */
1888 dprintk("nfsd4_renew: clientid not found!\n");
1889 goto out;
1890 }
1891 renew_client(clp);
1892 status = nfserr_cb_path_down;
ea1da636 1893 if (!list_empty(&clp->cl_delegations)
1da177e4
LT		 1894 && !atomic_read(&clp->cl_callback.cb_set))
1895 goto out;
1896 status = nfs_ok;
1897out:
1898 nfs4_unlock_state();
1899 return status;
1900}
1901
a76b4319
N		 1902static void
1903end_grace(void)
1904{
1905 dprintk("NFSD: end of grace period\n");
1906 in_grace = 0;
1907}
1908
fd39ca9a 1909static time_t
1da177e4
LT		 1910nfs4_laundromat(void)
1911{
1912 struct nfs4_client *clp;
1913 struct nfs4_stateowner *sop;
1914 struct nfs4_delegation *dp;
1915 struct list_head *pos, *next, reaplist;
1916 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1917 time_t t, clientid_val = NFSD_LEASE_TIME;
1918 time_t u, test_val = NFSD_LEASE_TIME;
1919
1920 nfs4_lock_state();
1921
1922 dprintk("NFSD: laundromat service - starting\n");
a76b4319
N		 1923 if (in_grace)
1924 end_grace();
1da177e4
LT		 1925 list_for_each_safe(pos, next, &client_lru) {
1926 clp = list_entry(pos, struct nfs4_client, cl_lru);
1927 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1928 t = clp->cl_time - cutoff;
1929 if (clientid_val > t)
1930 clientid_val = t;
1931 break;
1932 }
1933 dprintk("NFSD: purging unused client (clientid %08x)\n",
1934 clp->cl_clientid.cl_id);
1935 expire_client(clp);
1936 }
1937 INIT_LIST_HEAD(&reaplist);
1938 spin_lock(&recall_lock);
1939 list_for_each_safe(pos, next, &del_recall_lru) {
1940 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1941 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1942 u = dp->dl_time - cutoff;
1943 if (test_val > u)
1944 test_val = u;
1945 break;
1946 }
1947 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1948 dp, dp->dl_flock);
1949 list_move(&dp->dl_recall_lru, &reaplist);
1950 }
1951 spin_unlock(&recall_lock);
1952 list_for_each_safe(pos, next, &reaplist) {
1953 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1954 list_del_init(&dp->dl_recall_lru);
1955 unhash_delegation(dp);
1956 }
1957 test_val = NFSD_LEASE_TIME;
1958 list_for_each_safe(pos, next, &close_lru) {
1959 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1960 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1961 u = sop->so_time - cutoff;
1962 if (test_val > u)
1963 test_val = u;
1964 break;
1965 }
1966 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1967 sop->so_id);
1968 list_del(&sop->so_close_lru);
1969 nfs4_put_stateowner(sop);
1970 }
1971 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1972 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1973 nfs4_unlock_state();
1974 return clientid_val;
1975}
1976
1977void
1978laundromat_main(void *not_used)
1979{
1980 time_t t;
1981
1982 t = nfs4_laundromat();
1983 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1984 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1985}
1986
1987/* search ownerid_hashtbl[] and close_lru for stateid owner
1988 * (stateid->si_stateownerid)
1989 */
fd39ca9a 1990static struct nfs4_stateowner *
1da177e4
LT		 1991find_openstateowner_id(u32 st_id, int flags) {
1992 struct nfs4_stateowner *local = NULL;
1993
1994 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1995 if (flags & CLOSE_STATE) {
1996 list_for_each_entry(local, &close_lru, so_close_lru) {
1997 if (local->so_id == st_id)
1998 return local;
1999 }
2000 }
2001 return NULL;
2002}
2003
2004static inline int
2005nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2006{
2007 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
2008}
2009
2010static int
2011STALE_STATEID(stateid_t *stateid)
2012{
2013 if (stateid->si_boot == boot_time)
2014 return 0;
2015 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2016 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2017 stateid->si_generation);
2018 return 1;
2019}
2020
2021static inline int
2022access_permit_read(unsigned long access_bmap)
2023{
2024 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2025 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2026 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2027}
2028
2029static inline int
2030access_permit_write(unsigned long access_bmap)
2031{
2032 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2033 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2034}
2035
2036static
2037int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2038{
2039 int status = nfserr_openmode;
2040
2041 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2042 goto out;
2043 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2044 goto out;
2045 status = nfs_ok;
2046out:
2047 return status;
2048}
2049
1da177e4
LT		 2050static inline int
2051check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2052{
2053 /* Trying to call delegreturn with a special stateid? Yuch: */
2054 if (!(flags & (RD_STATE | WR_STATE)))
2055 return nfserr_bad_stateid;
2056 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2057 return nfs_ok;
2058 else if (nfs4_in_grace()) {
2059 /* Answer in remaining cases depends on existance of
2060 * conflicting state; so we must wait out the grace period. */
2061 return nfserr_grace;
2062 } else if (flags & WR_STATE)
2063 return nfs4_share_conflict(current_fh,
2064 NFS4_SHARE_DENY_WRITE);
2065 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2066 return nfs4_share_conflict(current_fh,
2067 NFS4_SHARE_DENY_READ);
2068}
2069
2070/*
2071 * Allow READ/WRITE during grace period on recovered state only for files
2072 * that are not able to provide mandatory locking.
2073 */
2074static inline int
2075io_during_grace_disallowed(struct inode *inode, int flags)
2076{
2077 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2078 && MANDATORY_LOCK(inode);
2079}
2080
2081/*
2082* Checks for stateid operations
2083*/
2084int
2085nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2086{
2087 struct nfs4_stateid *stp = NULL;
2088 struct nfs4_delegation *dp = NULL;
2089 stateid_t *stidp;
2090 struct inode *ino = current_fh->fh_dentry->d_inode;
2091 int status;
2092
2093 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2094 stateid->si_boot, stateid->si_stateownerid,
2095 stateid->si_fileid, stateid->si_generation);
2096 if (filpp)
2097 *filpp = NULL;
2098
2099 if (io_during_grace_disallowed(ino, flags))
2100 return nfserr_grace;
2101
2102 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2103 return check_special_stateids(current_fh, stateid, flags);
2104
2105 /* STALE STATEID */
2106 status = nfserr_stale_stateid;
2107 if (STALE_STATEID(stateid))
2108 goto out;
2109
2110 /* BAD STATEID */
2111 status = nfserr_bad_stateid;
2112 if (!stateid->si_fileid) { /* delegation stateid */
2113 if(!(dp = find_delegation_stateid(ino, stateid))) {
2114 dprintk("NFSD: delegation stateid not found\n");
2115 if (nfs4_in_grace())
2116 status = nfserr_grace;
2117 goto out;
2118 }
2119 stidp = &dp->dl_stateid;
2120 } else { /* open or lock stateid */
2121 if (!(stp = find_stateid(stateid, flags))) {
2122 dprintk("NFSD: open or lock stateid not found\n");
2123 if (nfs4_in_grace())
2124 status = nfserr_grace;
2125 goto out;
2126 }
2127 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2128 goto out;
2129 if (!stp->st_stateowner->so_confirmed)
2130 goto out;
2131 stidp = &stp->st_stateid;
2132 }
2133 if (stateid->si_generation > stidp->si_generation)
2134 goto out;
2135
2136 /* OLD STATEID */
2137 status = nfserr_old_stateid;
2138 if (stateid->si_generation < stidp->si_generation)
2139 goto out;
2140 if (stp) {
2141 if ((status = nfs4_check_openmode(stp,flags)))
2142 goto out;
2143 renew_client(stp->st_stateowner->so_client);
2144 if (filpp)
2145 *filpp = stp->st_vfs_file;
2146 } else if (dp) {
2147 if ((status = nfs4_check_delegmode(dp, flags)))
2148 goto out;
2149 renew_client(dp->dl_client);
2150 if (flags & DELEG_RET)
2151 unhash_delegation(dp);
2152 if (filpp)
2153 *filpp = dp->dl_vfs_file;
2154 }
2155 status = nfs_ok;
2156out:
2157 return status;
2158}
2159
2160
2161/*
2162 * Checks for sequence id mutating operations.
2163 */
fd39ca9a 2164static int
1da177e4
LT		 2165nfs4_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)
2166{
2167 int status;
2168 struct nfs4_stateid *stp;
2169 struct nfs4_stateowner *sop;
2170
2171 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2172 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2173 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2174 stateid->si_generation);
2175
2176 *stpp = NULL;
2177 *sopp = NULL;
2178
2179 status = nfserr_bad_stateid;
2180 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2181 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2182 goto out;
2183 }
2184
2185 status = nfserr_stale_stateid;
2186 if (STALE_STATEID(stateid))
2187 goto out;
2188 /*
2189 * We return BAD_STATEID if filehandle doesn't match stateid,
2190 * the confirmed flag is incorrecly set, or the generation
2191 * number is incorrect.
2192 * If there is no entry in the openfile table for this id,
2193 * we can't always return BAD_STATEID;
2194 * this might be a retransmitted CLOSE which has arrived after
2195 * the openfile has been released.
2196 */
2197 if (!(stp = find_stateid(stateid, flags)))
2198 goto no_nfs4_stateid;
2199
2200 status = nfserr_bad_stateid;
2201
2202 /* for new lock stateowners:
2203 * check that the lock->v.new.open_stateid
2204 * refers to an open stateowner
2205 *
2206 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2207 * as the open_stateid->st_stateowner->so_client->clientid
2208 */
2209 if (lockclid) {
2210 struct nfs4_stateowner *sop = stp->st_stateowner;
2211 struct nfs4_client *clp = sop->so_client;
2212
2213 if (!sop->so_is_open_owner)
2214 goto out;
2215 if (!cmp_clid(&clp->cl_clientid, lockclid))
2216 goto out;
2217 }
2218
2219 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2220 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2221 goto out;
2222 }
2223
2224 *stpp = stp;
2225 *sopp = sop = stp->st_stateowner;
2226
2227 /*
2228 * We now validate the seqid and stateid generation numbers.
2229 * For the moment, we ignore the possibility of
2230 * generation number wraparound.
2231 */
2232 if (seqid != sop->so_seqid + 1)
2233 goto check_replay;
2234
2235 if (sop->so_confirmed) {
2236 if (flags & CONFIRM) {
2237 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2238 goto out;
2239 }
2240 }
2241 else {
2242 if (!(flags & CONFIRM)) {
2243 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2244 goto out;
2245 }
2246 }
2247 if (stateid->si_generation > stp->st_stateid.si_generation) {
2248 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2249 goto out;
2250 }
2251
2252 status = nfserr_old_stateid;
2253 if (stateid->si_generation < stp->st_stateid.si_generation) {
2254 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2255 goto out;
2256 }
2257 /* XXX renew the client lease here */
2258 status = nfs_ok;
2259
2260out:
2261 return status;
2262
2263no_nfs4_stateid:
2264
2265 /*
2266 * We determine whether this is a bad stateid or a replay,
2267 * starting by trying to look up the stateowner.
2268 * If stateowner is not found - stateid is bad.
2269 */
2270 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2271 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2272 status = nfserr_bad_stateid;
2273 goto out;
2274 }
2275 *sopp = sop;
2276
2277check_replay:
2278 if (seqid == sop->so_seqid) {
2279 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2280 /* indicate replay to calling function */
2281 status = NFSERR_REPLAY_ME;
2282 } else {
2283 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2284
2285 *sopp = NULL;
2286 status = nfserr_bad_seqid;
2287 }
2288 goto out;
2289}
2290
2291int
2292nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2293{
2294 int status;
2295 struct nfs4_stateowner *sop;
2296 struct nfs4_stateid *stp;
2297
2298 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2299 (int)current_fh->fh_dentry->d_name.len,
2300 current_fh->fh_dentry->d_name.name);
2301
2302 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2303 goto out;
2304
2305 nfs4_lock_state();
2306
2307 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2308 &oc->oc_req_stateid,
2309 CHECK_FH | CONFIRM | OPEN_STATE,
2310 &oc->oc_stateowner, &stp, NULL)))
2311 goto out;
2312
2313 sop = oc->oc_stateowner;
2314 sop->so_confirmed = 1;
2315 update_stateid(&stp->st_stateid);
2316 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2317 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2318 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2319 stp->st_stateid.si_boot,
2320 stp->st_stateid.si_stateownerid,
2321 stp->st_stateid.si_fileid,
2322 stp->st_stateid.si_generation);
2323out:
2324 if (oc->oc_stateowner)
2325 nfs4_get_stateowner(oc->oc_stateowner);
2326 nfs4_unlock_state();
2327 return status;
2328}
2329
2330
2331/*
2332 * unset all bits in union bitmap (bmap) that
2333 * do not exist in share (from successful OPEN_DOWNGRADE)
2334 */
2335static void
2336reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2337{
2338 int i;
2339 for (i = 1; i < 4; i++) {
2340 if ((i & access) != i)
2341 __clear_bit(i, bmap);
2342 }
2343}
2344
2345static void
2346reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2347{
2348 int i;
2349 for (i = 0; i < 4; i++) {
2350 if ((i & deny) != i)
2351 __clear_bit(i, bmap);
2352 }
2353}
2354
2355int
2356nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2357{
2358 int status;
2359 struct nfs4_stateid *stp;
2360 unsigned int share_access;
2361
2362 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2363 (int)current_fh->fh_dentry->d_name.len,
2364 current_fh->fh_dentry->d_name.name);
2365
2366 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2367 return nfserr_inval;
2368
2369 nfs4_lock_state();
2370 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2371 &od->od_stateid,
2372 CHECK_FH | OPEN_STATE,
2373 &od->od_stateowner, &stp, NULL)))
2374 goto out;
2375
2376 status = nfserr_inval;
2377 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2378 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2379 stp->st_access_bmap, od->od_share_access);
2380 goto out;
2381 }
2382 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2383 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2384 stp->st_deny_bmap, od->od_share_deny);
2385 goto out;
2386 }
2387 set_access(&share_access, stp->st_access_bmap);
2388 nfs4_file_downgrade(stp->st_vfs_file,
2389 share_access & ~od->od_share_access);
2390
2391 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2392 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2393
2394 update_stateid(&stp->st_stateid);
2395 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2396 status = nfs_ok;
2397out:
2398 if (od->od_stateowner)
2399 nfs4_get_stateowner(od->od_stateowner);
2400 nfs4_unlock_state();
2401 return status;
2402}
2403
2404/*
2405 * nfs4_unlock_state() called after encode
2406 */
2407int
2408nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2409{
2410 int status;
2411 struct nfs4_stateid *stp;
2412
2413 dprintk("NFSD: nfsd4_close on file %.*s\n",
2414 (int)current_fh->fh_dentry->d_name.len,
2415 current_fh->fh_dentry->d_name.name);
2416
2417 nfs4_lock_state();
2418 /* check close_lru for replay */
2419 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2420 &close->cl_stateid,
2421 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2422 &close->cl_stateowner, &stp, NULL)))
2423 goto out;
2424 /*
2425 * Return success, but first update the stateid.
2426 */
2427 status = nfs_ok;
2428 update_stateid(&stp->st_stateid);
2429 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2430
2431 /* release_state_owner() calls nfsd_close() if needed */
2432 release_state_owner(stp, OPEN_STATE);
2433out:
2434 if (close->cl_stateowner)
2435 nfs4_get_stateowner(close->cl_stateowner);
2436 nfs4_unlock_state();
2437 return status;
2438}
2439
2440int
2441nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2442{
2443 int status;
2444
2445 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2446 goto out;
2447
2448 nfs4_lock_state();
2449 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2450 nfs4_unlock_state();
2451out:
2452 return status;
2453}
2454
2455
2456/*
2457 * Lock owner state (byte-range locks)
2458 */
2459#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2460#define LOCK_HASH_BITS 8
2461#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2462#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2463
2464#define lockownerid_hashval(id) \
2465 ((id) & LOCK_HASH_MASK)
2466
2467static inline unsigned int
2468lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2469 struct xdr_netobj *ownername)
2470{
2471 return (file_hashval(inode) + cl_id
2472 + opaque_hashval(ownername->data, ownername->len))
2473 & LOCK_HASH_MASK;
2474}
2475
2476static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2477static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2478static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2479
fd39ca9a 2480static struct nfs4_stateid *
1da177e4
LT		 2481find_stateid(stateid_t *stid, int flags)
2482{
2483 struct nfs4_stateid *local = NULL;
2484 u32 st_id = stid->si_stateownerid;
2485 u32 f_id = stid->si_fileid;
2486 unsigned int hashval;
2487
2488 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2489 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2490 hashval = stateid_hashval(st_id, f_id);
2491 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2492 if ((local->st_stateid.si_stateownerid == st_id) &&
2493 (local->st_stateid.si_fileid == f_id))
2494 return local;
2495 }
2496 }
2497 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2498 hashval = stateid_hashval(st_id, f_id);
2499 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2500 if ((local->st_stateid.si_stateownerid == st_id) &&
2501 (local->st_stateid.si_fileid == f_id))
2502 return local;
2503 }
2504 } else
2505 printk("NFSD: find_stateid: ERROR: no state flag\n");
2506 return NULL;
2507}
2508
2509static struct nfs4_delegation *
2510find_delegation_stateid(struct inode *ino, stateid_t *stid)
2511{
13cd2184
N		 2512 struct nfs4_file *fp;
2513 struct nfs4_delegation *dl;
1da177e4
LT		 2514
2515 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2516 stid->si_boot, stid->si_stateownerid,
2517 stid->si_fileid, stid->si_generation);
2518
1da177e4 2519 fp = find_file(ino);
13cd2184
N		 2520 if (!fp)
2521 return NULL;
2522 dl = find_delegation_file(fp, stid);
2523 put_nfs4_file(fp);
2524 return dl;
1da177e4
LT		 2525}
2526
2527/*
2528 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2529 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2530 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2531 * locking, this prevents us from being completely protocol-compliant. The
2532 * real solution to this problem is to start using unsigned file offsets in
2533 * the VFS, but this is a very deep change!
2534 */
2535static inline void
2536nfs4_transform_lock_offset(struct file_lock *lock)
2537{
2538 if (lock->fl_start < 0)
2539 lock->fl_start = OFFSET_MAX;
2540 if (lock->fl_end < 0)
2541 lock->fl_end = OFFSET_MAX;
2542}
2543
fd39ca9a 2544static int
1da177e4
LT		 2545nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2546{
2547 struct nfs4_stateowner *local = NULL;
2548 int status = 0;
2549
2550 if (hashval >= LOCK_HASH_SIZE)
2551 goto out;
2552 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2553 if (local == sop) {
2554 status = 1;
2555 goto out;
2556 }
2557 }
2558out:
2559 return status;
2560}
2561
2562
2563static inline void
2564nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2565{
2566 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2567 unsigned int hval = lockownerid_hashval(sop->so_id);
2568
2569 deny->ld_sop = NULL;
2570 if (nfs4_verify_lock_stateowner(sop, hval)) {
2571 kref_get(&sop->so_ref);
2572 deny->ld_sop = sop;
2573 deny->ld_clientid = sop->so_client->cl_clientid;
2574 }
2575 deny->ld_start = fl->fl_start;
2576 deny->ld_length = ~(u64)0;
2577 if (fl->fl_end != ~(u64)0)
2578 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2579 deny->ld_type = NFS4_READ_LT;
2580 if (fl->fl_type != F_RDLCK)
2581 deny->ld_type = NFS4_WRITE_LT;
2582}
2583
1da177e4
LT		 2584static struct nfs4_stateowner *
2585find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2586 struct xdr_netobj *owner)
2587{
2588 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2589 struct nfs4_stateowner *op;
2590
2591 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2592 if (cmp_owner_str(op, owner, clid))
2593 return op;
2594 }
2595 return NULL;
2596}
2597
2598/*
2599 * Alloc a lock owner structure.
2600 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2601 * occured.
2602 *
2603 * strhashval = lock_ownerstr_hashval
2604 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2605 */
2606
2607static struct nfs4_stateowner *
2608alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2609 struct nfs4_stateowner *sop;
2610 struct nfs4_replay *rp;
2611 unsigned int idhashval;
2612
2613 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2614 return NULL;
2615 idhashval = lockownerid_hashval(current_ownerid);
2616 INIT_LIST_HEAD(&sop->so_idhash);
2617 INIT_LIST_HEAD(&sop->so_strhash);
2618 INIT_LIST_HEAD(&sop->so_perclient);
ea1da636
N		 2619 INIT_LIST_HEAD(&sop->so_stateids);
2620 INIT_LIST_HEAD(&sop->so_perstateid);
1da177e4
LT		 2621 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2622 sop->so_time = 0;
2623 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2624 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
ea1da636 2625 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
1da177e4
LT		 2626 sop->so_is_open_owner = 0;
2627 sop->so_id = current_ownerid++;
2628 sop->so_client = clp;
2629 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2630 sop->so_confirmed = 1;
2631 rp = &sop->so_replay;
2632 rp->rp_status = NFSERR_SERVERFAULT;
2633 rp->rp_buflen = 0;
2634 rp->rp_buf = rp->rp_ibuf;
2635 return sop;
2636}
2637
fd39ca9a 2638static struct nfs4_stateid *
1da177e4
LT		 2639alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2640{
2641 struct nfs4_stateid *stp;
2642 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2643
5ac049ac
N		 2644 stp = nfs4_alloc_stateid();
2645 if (stp == NULL)
1da177e4
LT		 2646 goto out;
2647 INIT_LIST_HEAD(&stp->st_hash);
2648 INIT_LIST_HEAD(&stp->st_perfile);
ea1da636
N		 2649 INIT_LIST_HEAD(&stp->st_perstateowner);
2650 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
1da177e4 2651 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2652 list_add(&stp->st_perfile, &fp->fi_stateids);
ea1da636 2653 list_add(&stp->st_perstateowner, &sop->so_stateids);
1da177e4 2654 stp->st_stateowner = sop;
13cd2184 2655 get_nfs4_file(fp);
1da177e4
LT		 2656 stp->st_file = fp;
2657 stp->st_stateid.si_boot = boot_time;
2658 stp->st_stateid.si_stateownerid = sop->so_id;
2659 stp->st_stateid.si_fileid = fp->fi_id;
2660 stp->st_stateid.si_generation = 0;
2661 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2662 stp->st_access_bmap = open_stp->st_access_bmap;
2663 stp->st_deny_bmap = open_stp->st_deny_bmap;
2664
2665out:
2666 return stp;
2667}
2668
fd39ca9a 2669static int
1da177e4
LT		 2670check_lock_length(u64 offset, u64 length)
2671{
2672 return ((length == 0) || ((length != ~(u64)0) &&
2673 LOFF_OVERFLOW(offset, length)));
2674}
2675
2676/*
2677 * LOCK operation
2678 */
2679int
2680nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2681{
3e9e3dbe 2682 struct nfs4_stateowner *open_sop = NULL;
1da177e4
LT		 2683 struct nfs4_stateid *lock_stp;
2684 struct file *filp;
2685 struct file_lock file_lock;
2686 struct file_lock *conflock;
2687 int status = 0;
2688 unsigned int strhashval;
2689
2690 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2691 (long long) lock->lk_offset,
2692 (long long) lock->lk_length);
2693
2694 if (nfs4_in_grace() && !lock->lk_reclaim)
2695 return nfserr_grace;
2696 if (!nfs4_in_grace() && lock->lk_reclaim)
2697 return nfserr_no_grace;
2698
2699 if (check_lock_length(lock->lk_offset, lock->lk_length))
2700 return nfserr_inval;
2701
2702 nfs4_lock_state();
2703
2704 if (lock->lk_is_new) {
2705 /*
2706 * Client indicates that this is a new lockowner.
2707 * Use open owner and open stateid to create lock owner and lock
2708 * stateid.
2709 */
2710 struct nfs4_stateid *open_stp = NULL;
2711 struct nfs4_file *fp;
2712
2713 status = nfserr_stale_clientid;
2714 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2715 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2716 goto out;
2717 }
2718
2719 /* is the new lock seqid presented by the client zero? */
2720 status = nfserr_bad_seqid;
2721 if (lock->v.new.lock_seqid != 0)
2722 goto out;
2723
2724 /* validate and update open stateid and open seqid */
2725 status = nfs4_preprocess_seqid_op(current_fh,
2726 lock->lk_new_open_seqid,
2727 &lock->lk_new_open_stateid,
2728 CHECK_FH | OPEN_STATE,
2729 &open_sop, &open_stp,
2730 &lock->v.new.clientid);
2731 if (status) {
2732 if (lock->lk_reclaim)
2733 status = nfserr_reclaim_bad;
2734 goto out;
2735 }
2736 /* create lockowner and lock stateid */
2737 fp = open_stp->st_file;
2738 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2739 open_sop->so_client->cl_clientid.cl_id,
2740 &lock->v.new.owner);
3e9e3dbe
N		 2741 /* XXX: Do we need to check for duplicate stateowners on
2742 * the same file, or should they just be allowed (and
2743 * create new stateids)? */
1da177e4
LT		 2744 status = nfserr_resource;
2745 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2746 goto out;
2747 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2748 fp, open_stp)) == NULL) {
2749 release_stateowner(lock->lk_stateowner);
2750 lock->lk_stateowner = NULL;
2751 goto out;
2752 }
2753 /* bump the open seqid used to create the lock */
2754 open_sop->so_seqid++;
2755 } else {
2756 /* lock (lock owner + lock stateid) already exists */
2757 status = nfs4_preprocess_seqid_op(current_fh,
2758 lock->lk_old_lock_seqid,
2759 &lock->lk_old_lock_stateid,
2760 CHECK_FH | LOCK_STATE,
2761 &lock->lk_stateowner, &lock_stp, NULL);
2762 if (status)
2763 goto out;
2764 }
2765 /* lock->lk_stateowner and lock_stp have been created or found */
2766 filp = lock_stp->st_vfs_file;
2767
2768 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2769 printk("NFSD: nfsd4_lock: permission denied!\n");
2770 goto out;
2771 }
2772
2773 locks_init_lock(&file_lock);
2774 switch (lock->lk_type) {
2775 case NFS4_READ_LT:
2776 case NFS4_READW_LT:
2777 file_lock.fl_type = F_RDLCK;
2778 break;
2779 case NFS4_WRITE_LT:
2780 case NFS4_WRITEW_LT:
2781 file_lock.fl_type = F_WRLCK;
2782 break;
2783 default:
2784 status = nfserr_inval;
2785 goto out;
2786 }
2787 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2788 file_lock.fl_pid = current->tgid;
2789 file_lock.fl_file = filp;
2790 file_lock.fl_flags = FL_POSIX;
2791
2792 file_lock.fl_start = lock->lk_offset;
2793 if ((lock->lk_length == ~(u64)0) ||
2794 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2795 file_lock.fl_end = ~(u64)0;
2796 else
2797 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2798 nfs4_transform_lock_offset(&file_lock);
2799
2800 /*
2801 * Try to lock the file in the VFS.
2802 * Note: locks.c uses the BKL to protect the inode's lock list.
2803 */
2804
2805 status = posix_lock_file(filp, &file_lock);
2806 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2807 file_lock.fl_ops->fl_release_private(&file_lock);
2808 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2809 switch (-status) {
2810 case 0: /* success! */
2811 update_stateid(&lock_stp->st_stateid);
2812 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2813 sizeof(stateid_t));
2814 goto out;
2815 case (EAGAIN):
2816 goto conflicting_lock;
2817 case (EDEADLK):
2818 status = nfserr_deadlock;
2819 default:
2820 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2821 goto out_destroy_new_stateid;
2822 }
2823
2824conflicting_lock:
2825 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2826 status = nfserr_denied;
2827 /* XXX There is a race here. Future patch needed to provide
2828 * an atomic posix_lock_and_test_file
2829 */
2830 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2831 status = nfserr_serverfault;
2832 goto out;
2833 }
2834 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2835
2836out_destroy_new_stateid:
2837 if (lock->lk_is_new) {
2838 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2839 /*
2840 * An error encountered after instantiation of the new
2841 * stateid has forced us to destroy it.
2842 */
2843 if (!seqid_mutating_err(status))
2844 open_sop->so_seqid--;
2845
2846 release_state_owner(lock_stp, LOCK_STATE);
2847 }
2848out:
2849 if (lock->lk_stateowner)
2850 nfs4_get_stateowner(lock->lk_stateowner);
2851 nfs4_unlock_state();
2852 return status;
2853}
2854
2855/*
2856 * LOCKT operation
2857 */
2858int
2859nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2860{
2861 struct inode *inode;
2862 struct file file;
2863 struct file_lock file_lock;
2864 struct file_lock *conflicting_lock;
2865 int status;
2866
2867 if (nfs4_in_grace())
2868 return nfserr_grace;
2869
2870 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2871 return nfserr_inval;
2872
2873 lockt->lt_stateowner = NULL;
2874 nfs4_lock_state();
2875
2876 status = nfserr_stale_clientid;
2877 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2878 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2879 goto out;
2880 }
2881
2882 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2883 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2884 if (status == nfserr_symlink)
2885 status = nfserr_inval;
2886 goto out;
2887 }
2888
2889 inode = current_fh->fh_dentry->d_inode;
2890 locks_init_lock(&file_lock);
2891 switch (lockt->lt_type) {
2892 case NFS4_READ_LT:
2893 case NFS4_READW_LT:
2894 file_lock.fl_type = F_RDLCK;
2895 break;
2896 case NFS4_WRITE_LT:
2897 case NFS4_WRITEW_LT:
2898 file_lock.fl_type = F_WRLCK;
2899 break;
2900 default:
2901 printk("NFSD: nfs4_lockt: bad lock type!\n");
2902 status = nfserr_inval;
2903 goto out;
2904 }
2905
2906 lockt->lt_stateowner = find_lockstateowner_str(inode,
2907 &lockt->lt_clientid, &lockt->lt_owner);
2908 if (lockt->lt_stateowner)
2909 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2910 file_lock.fl_pid = current->tgid;
2911 file_lock.fl_flags = FL_POSIX;
2912
2913 file_lock.fl_start = lockt->lt_offset;
2914 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2915 file_lock.fl_end = ~(u64)0;
2916 else
2917 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2918
2919 nfs4_transform_lock_offset(&file_lock);
2920
2921 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2922 * since LOCKT doesn't require an OPEN, and therefore a struct
2923 * file may not exist, pass posix_test_lock a struct file with
2924 * only the dentry:inode set.
2925 */
2926 memset(&file, 0, sizeof (struct file));
2927 file.f_dentry = current_fh->fh_dentry;
2928
2929 status = nfs_ok;
2930 conflicting_lock = posix_test_lock(&file, &file_lock);
2931 if (conflicting_lock) {
2932 status = nfserr_denied;
2933 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2934 }
2935out:
2936 nfs4_unlock_state();
2937 return status;
2938}
2939
2940int
2941nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2942{
2943 struct nfs4_stateid *stp;
2944 struct file *filp = NULL;
2945 struct file_lock file_lock;
2946 int status;
2947
2948 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2949 (long long) locku->lu_offset,
2950 (long long) locku->lu_length);
2951
2952 if (check_lock_length(locku->lu_offset, locku->lu_length))
2953 return nfserr_inval;
2954
2955 nfs4_lock_state();
2956
2957 if ((status = nfs4_preprocess_seqid_op(current_fh,
2958 locku->lu_seqid,
2959 &locku->lu_stateid,
2960 CHECK_FH | LOCK_STATE,
2961 &locku->lu_stateowner, &stp, NULL)))
2962 goto out;
2963
2964 filp = stp->st_vfs_file;
2965 BUG_ON(!filp);
2966 locks_init_lock(&file_lock);
2967 file_lock.fl_type = F_UNLCK;
2968 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2969 file_lock.fl_pid = current->tgid;
2970 file_lock.fl_file = filp;
2971 file_lock.fl_flags = FL_POSIX;
2972 file_lock.fl_start = locku->lu_offset;
2973
2974 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2975 file_lock.fl_end = ~(u64)0;
2976 else
2977 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2978 nfs4_transform_lock_offset(&file_lock);
2979
2980 /*
2981 * Try to unlock the file in the VFS.
2982 */
2983 status = posix_lock_file(filp, &file_lock);
2984 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2985 file_lock.fl_ops->fl_release_private(&file_lock);
2986 if (status) {
2987 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2988 goto out_nfserr;
2989 }
2990 /*
2991 * OK, unlock succeeded; the only thing left to do is update the stateid.
2992 */
2993 update_stateid(&stp->st_stateid);
2994 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2995
2996out:
2997 if (locku->lu_stateowner)
2998 nfs4_get_stateowner(locku->lu_stateowner);
2999 nfs4_unlock_state();
3000 return status;
3001
3002out_nfserr:
3003 status = nfserrno(status);
3004 goto out;
3005}
3006
3007/*
3008 * returns
3009 * 1: locks held by lockowner
3010 * 0: no locks held by lockowner
3011 */
3012static int
3013check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3014{
3015 struct file_lock **flpp;
3016 struct inode *inode = filp->f_dentry->d_inode;
3017 int status = 0;
3018
3019 lock_kernel();
3020 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3021 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3022 status = 1;
3023 goto out;
3024 }
3025out:
3026 unlock_kernel();
3027 return status;
3028}
3029
3030int
3031nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3032{
3033 clientid_t *clid = &rlockowner->rl_clientid;
3e9e3dbe
N		 3034 struct nfs4_stateowner *sop;
3035 struct nfs4_stateid *stp;
1da177e4 3036 struct xdr_netobj *owner = &rlockowner->rl_owner;
3e9e3dbe
N		 3037 struct list_head matches;
3038 int i;
1da177e4
LT		 3039 int status;
3040
3041 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3042 clid->cl_boot, clid->cl_id);
3043
3044 /* XXX check for lease expiration */
3045
3046 status = nfserr_stale_clientid;
3047 if (STALE_CLIENTID(clid)) {
3048 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3049 return status;
3050 }
3051
3052 nfs4_lock_state();
3053
3e9e3dbe
N		 3054 status = nfserr_locks_held;
3055 /* XXX: we're doing a linear search through all the lockowners.
3056 * Yipes! For now we'll just hope clients aren't really using
3057 * release_lockowner much, but eventually we have to fix these
3058 * data structures. */
3059 INIT_LIST_HEAD(&matches);
3060 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3061 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3062 if (!cmp_owner_str(sop, owner, clid))
3063 continue;
3064 list_for_each_entry(stp, &sop->so_stateids,
3065 st_perstateowner) {
3066 if (check_for_locks(stp->st_vfs_file, sop))
3067 goto out;
3068 /* Note: so_perclient unused for lockowners,
3069 * so it's OK to fool with here. */
3070 list_add(&sop->so_perclient, &matches);
3071 }
1da177e4 3072 }
3e9e3dbe
N		 3073 }
3074 /* Clients probably won't expect us to return with some (but not all)
3075 * of the lockowner state released; so don't release any until all
3076 * have been checked. */
3077 status = nfs_ok;
3078 list_for_each_entry(sop, &matches, so_perclient) {
3079 release_stateowner(sop);
1da177e4
LT		 3080 }
3081out:
3082 nfs4_unlock_state();
3083 return status;
3084}
3085
3086static inline struct nfs4_client_reclaim *
a55370a3 3087alloc_reclaim(void)
1da177e4 3088{
a55370a3 3089 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3090}
3091
3092/*
3093 * failure => all reset bets are off, nfserr_no_grace...
3094 */
190e4fbf
N		 3095int
3096nfs4_client_to_reclaim(const char *name)
1da177e4
LT		 3097{
3098 unsigned int strhashval;
3099 struct nfs4_client_reclaim *crp = NULL;
3100
a55370a3
N		 3101 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3102 crp = alloc_reclaim();
1da177e4
LT		 3103 if (!crp)
3104 return 0;
a55370a3 3105 strhashval = clientstr_hashval(name);
1da177e4
LT		 3106 INIT_LIST_HEAD(&crp->cr_strhash);
3107 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3108 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3109 reclaim_str_hashtbl_size++;
3110 return 1;
3111}
3112
3113static void
3114nfs4_release_reclaim(void)
3115{
3116 struct nfs4_client_reclaim *crp = NULL;
3117 int i;
3118
1da177e4
LT		 3119 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3120 while (!list_empty(&reclaim_str_hashtbl[i])) {
3121 crp = list_entry(reclaim_str_hashtbl[i].next,
3122 struct nfs4_client_reclaim, cr_strhash);
3123 list_del(&crp->cr_strhash);
1da177e4
LT		 3124 kfree(crp);
3125 reclaim_str_hashtbl_size--;
3126 }
3127 }
3128 BUG_ON(reclaim_str_hashtbl_size);
3129}
3130
3131/*
3132 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
fd39ca9a 3133static struct nfs4_client_reclaim *
1da177e4
LT		 3134nfs4_find_reclaim_client(clientid_t *clid)
3135{
3136 unsigned int strhashval;
3137 struct nfs4_client *clp;
3138 struct nfs4_client_reclaim *crp = NULL;
3139
3140
3141 /* find clientid in conf_id_hashtbl */
3142 clp = find_confirmed_client(clid);
3143 if (clp == NULL)
3144 return NULL;
3145
a55370a3
N		 3146 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3147 clp->cl_name.len, clp->cl_name.data,
3148 clp->cl_recdir);
1da177e4
LT		 3149
3150 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3151 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3152 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3153 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3154 return crp;
3155 }
3156 }
3157 return NULL;
3158}
3159
3160/*
3161* Called from OPEN. Look for clientid in reclaim list.
3162*/
3163int
3164nfs4_check_open_reclaim(clientid_t *clid)
3165{
dfc83565 3166 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3167}
3168
ac4d8ff2 3169/* initialization to perform at module load time: */
1da177e4 3170
ac4d8ff2
N		 3171void
3172nfs4_state_init(void)
1da177e4
LT		 3173{
3174 int i;
1da177e4 3175
1da177e4
LT		 3176 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3177 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3178 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3179 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3180 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3181 }
3182 for (i = 0; i < FILE_HASH_SIZE; i++) {
3183 INIT_LIST_HEAD(&file_hashtbl[i]);
3184 }
3185 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3186 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3187 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3188 }
3189 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3190 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3191 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3192 }
3193 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3194 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3195 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3196 }
1da177e4 3197 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3198 INIT_LIST_HEAD(&close_lru);
3199 INIT_LIST_HEAD(&client_lru);
3200 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3201 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3202 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3203 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3204}
3205
190e4fbf
N		 3206static void
3207nfsd4_load_reboot_recovery_data(void)
3208{
3209 int status;
3210
3211 nfsd4_init_recdir(recovery_dirname);
3212 status = nfsd4_recdir_load();
3213 if (status)
3214 printk("NFSD: Failure reading reboot recovery data\n");
3215}
3216
ac4d8ff2
N		 3217/* initialization to perform when the nfsd service is started: */
3218
3219static void
3220__nfs4_state_start(void)
3221{
3222 time_t grace_time;
3223
1da177e4 3224 boot_time = get_seconds();
d99a05ad
N		 3225 grace_time = max(user_lease_time, lease_time);
3226 lease_time = user_lease_time;
a76b4319 3227 in_grace = 1;
d99a05ad 3228 printk("NFSD: starting %ld-second grace period\n", grace_time);
58da282b 3229 laundry_wq = create_singlethread_workqueue("nfsd4");
a76b4319 3230 queue_delayed_work(laundry_wq, &laundromat_work, grace_time*HZ);
1da177e4
LT		 3231}
3232
3233int
76a3550e 3234nfs4_state_start(void)
1da177e4
LT		 3235{
3236 int status;
3237
3238 if (nfs4_init)
3239 return 0;
3240 status = nfsd4_init_slabs();
3241 if (status)
3242 return status;
190e4fbf 3243 nfsd4_load_reboot_recovery_data();
76a3550e 3244 __nfs4_state_start();
1da177e4
LT		 3245 nfs4_init = 1;
3246 return 0;
3247}
3248
3249int
3250nfs4_in_grace(void)
3251{
a76b4319 3252 return in_grace;
1da177e4
LT		 3253}
3254
3255time_t
3256nfs4_lease_time(void)
3257{
3258 return lease_time;
3259}
3260
3261static void
3262__nfs4_state_shutdown(void)
3263{
3264 int i;
3265 struct nfs4_client *clp = NULL;
3266 struct nfs4_delegation *dp = NULL;
3267 struct nfs4_stateowner *sop = NULL;
3268 struct list_head *pos, *next, reaplist;
3269
3270 list_for_each_safe(pos, next, &close_lru) {
3271 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3272 list_del(&sop->so_close_lru);
3273 nfs4_put_stateowner(sop);
3274 }
3275
3276 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3277 while (!list_empty(&conf_id_hashtbl[i])) {
3278 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3279 expire_client(clp);
3280 }
3281 while (!list_empty(&unconf_str_hashtbl[i])) {
3282 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3283 expire_client(clp);
3284 }
3285 }
3286 INIT_LIST_HEAD(&reaplist);
3287 spin_lock(&recall_lock);
3288 list_for_each_safe(pos, next, &del_recall_lru) {
3289 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3290 list_move(&dp->dl_recall_lru, &reaplist);
3291 }
3292 spin_unlock(&recall_lock);
3293 list_for_each_safe(pos, next, &reaplist) {
3294 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3295 list_del_init(&dp->dl_recall_lru);
3296 unhash_delegation(dp);
3297 }
3298
1da177e4 3299 cancel_delayed_work(&laundromat_work);
58da282b
N		 3300 flush_workqueue(laundry_wq);
3301 destroy_workqueue(laundry_wq);
190e4fbf 3302 nfsd4_shutdown_recdir();
1da177e4 3303 nfs4_init = 0;
1da177e4
LT		 3304}
3305
3306void
3307nfs4_state_shutdown(void)
3308{
3309 nfs4_lock_state();
3310 nfs4_release_reclaim();
3311 __nfs4_state_shutdown();
3312 nfsd4_free_slabs();
3313 nfs4_unlock_state();
3314}
3315
3316/*
3317 * Called when leasetime is changed.
3318 *
d99a05ad
N		 3319 * The only way the protocol gives us to handle on-the-fly lease changes is to
3320 * simulate a reboot. Instead of doing that, we just wait till the next time
3321 * we start to register any changes in lease time. If the administrator
3322 * really wants to change the lease time *now*, they can go ahead and bring
3323 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3324 */
3325void
3326nfs4_reset_lease(time_t leasetime)
3327{
d99a05ad
N		 3328 lock_kernel();
3329 user_lease_time = leasetime;
3330 unlock_kernel();
1da177e4 3331}
Linux 6.x block layer and io_uring tree(s)