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[PATCH] knfsd: nfsd4: reboot hash
[linux-2.6-block.git] / fs / nfsd / nfs4state.c
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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;
1da177e4
LT		 57time_t boot_time;
58static time_t grace_end = 0;
59static u32 current_clientid = 1;
60static u32 current_ownerid = 1;
61static u32 current_fileid = 1;
62static u32 current_delegid = 1;
63static u32 nfs4_init;
64stateid_t zerostateid; /* bits all 0 */
65stateid_t onestateid; /* bits all 1 */
66
1da177e4
LT		 67/* forward declarations */
68struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
69static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
70static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
71
72/* Locking:
73 *
74 * client_sema:
75 * protects clientid_hashtbl[], clientstr_hashtbl[],
76 * unconfstr_hashtbl[], uncofid_hashtbl[].
77 */
78static DECLARE_MUTEX(client_sema);
79
e60d4398
N		 80kmem_cache_t *stateowner_slab = NULL;
81kmem_cache_t *file_slab = NULL;
5ac049ac 82kmem_cache_t *stateid_slab = NULL;
5b2d21c1 83kmem_cache_t *deleg_slab = NULL;
e60d4398 84
1da177e4
LT		 85void
86nfs4_lock_state(void)
87{
88 down(&client_sema);
89}
90
91void
92nfs4_unlock_state(void)
93{
94 up(&client_sema);
95}
96
97static inline u32
98opaque_hashval(const void *ptr, int nbytes)
99{
100 unsigned char *cptr = (unsigned char *) ptr;
101
102 u32 x = 0;
103 while (nbytes--) {
104 x *= 37;
105 x += *cptr++;
106 }
107 return x;
108}
109
110/* forward declarations */
111static void release_stateowner(struct nfs4_stateowner *sop);
112static void release_stateid(struct nfs4_stateid *stp, int flags);
1da177e4
LT		 113
114/*
115 * Delegation state
116 */
117
118/* recall_lock protects the del_recall_lru */
ac4d8ff2 119spinlock_t recall_lock = SPIN_LOCK_UNLOCKED;
1da177e4
LT		 120static struct list_head del_recall_lru;
121
13cd2184
N		 122static void
123free_nfs4_file(struct kref *kref)
124{
125 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
126 list_del(&fp->fi_hash);
127 iput(fp->fi_inode);
128 kmem_cache_free(file_slab, fp);
129}
130
131static inline void
132put_nfs4_file(struct nfs4_file *fi)
133{
134 kref_put(&fi->fi_ref, free_nfs4_file);
135}
136
137static inline void
138get_nfs4_file(struct nfs4_file *fi)
139{
140 kref_get(&fi->fi_ref);
141}
142
1da177e4
LT		 143static struct nfs4_delegation *
144alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
145{
146 struct nfs4_delegation *dp;
147 struct nfs4_file *fp = stp->st_file;
148 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
149
150 dprintk("NFSD alloc_init_deleg\n");
5b2d21c1
N		 151 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
152 if (dp == NULL)
1da177e4
LT		 153 return dp;
154 INIT_LIST_HEAD(&dp->dl_del_perfile);
155 INIT_LIST_HEAD(&dp->dl_del_perclnt);
156 INIT_LIST_HEAD(&dp->dl_recall_lru);
157 dp->dl_client = clp;
13cd2184 158 get_nfs4_file(fp);
1da177e4
LT		 159 dp->dl_file = fp;
160 dp->dl_flock = NULL;
161 get_file(stp->st_vfs_file);
162 dp->dl_vfs_file = stp->st_vfs_file;
163 dp->dl_type = type;
164 dp->dl_recall.cbr_dp = NULL;
165 dp->dl_recall.cbr_ident = cb->cb_ident;
166 dp->dl_recall.cbr_trunc = 0;
167 dp->dl_stateid.si_boot = boot_time;
168 dp->dl_stateid.si_stateownerid = current_delegid++;
169 dp->dl_stateid.si_fileid = 0;
170 dp->dl_stateid.si_generation = 0;
171 dp->dl_fhlen = current_fh->fh_handle.fh_size;
172 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
173 current_fh->fh_handle.fh_size);
174 dp->dl_time = 0;
175 atomic_set(&dp->dl_count, 1);
8beefa24 176 list_add(&dp->dl_del_perfile, &fp->fi_delegations);
1da177e4 177 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
1da177e4
LT		 178 return dp;
179}
180
181void
182nfs4_put_delegation(struct nfs4_delegation *dp)
183{
184 if (atomic_dec_and_test(&dp->dl_count)) {
185 dprintk("NFSD: freeing dp %p\n",dp);
13cd2184 186 put_nfs4_file(dp->dl_file);
5b2d21c1 187 kmem_cache_free(deleg_slab, dp);
1da177e4
LT		 188 }
189}
190
191/* Remove the associated file_lock first, then remove the delegation.
192 * lease_modify() is called to remove the FS_LEASE file_lock from
193 * the i_flock list, eventually calling nfsd's lock_manager
194 * fl_release_callback.
195 */
196static void
197nfs4_close_delegation(struct nfs4_delegation *dp)
198{
199 struct file *filp = dp->dl_vfs_file;
200
201 dprintk("NFSD: close_delegation dp %p\n",dp);
202 dp->dl_vfs_file = NULL;
203 /* The following nfsd_close may not actually close the file,
204 * but we want to remove the lease in any case. */
c907132d
N		 205 if (dp->dl_flock)
206 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4 207 nfsd_close(filp);
1da177e4
LT		 208}
209
210/* Called under the state lock. */
211static void
212unhash_delegation(struct nfs4_delegation *dp)
213{
214 list_del_init(&dp->dl_del_perfile);
215 list_del_init(&dp->dl_del_perclnt);
216 spin_lock(&recall_lock);
217 list_del_init(&dp->dl_recall_lru);
218 spin_unlock(&recall_lock);
219 nfs4_close_delegation(dp);
220 nfs4_put_delegation(dp);
221}
222
223/*
224 * SETCLIENTID state
225 */
226
227/* Hash tables for nfs4_clientid state */
228#define CLIENT_HASH_BITS 4
229#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
230#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
231
232#define clientid_hashval(id) \
233 ((id) & CLIENT_HASH_MASK)
a55370a3
N		 234#define clientstr_hashval(name) \
235 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
1da177e4
LT		 236/*
237 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
238 * used in reboot/reset lease grace period processing
239 *
240 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
241 * setclientid_confirmed info.
242 *
243 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
244 * setclientid info.
245 *
246 * client_lru holds client queue ordered by nfs4_client.cl_time
247 * for lease renewal.
248 *
249 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
250 * for last close replay.
251 */
252static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
253static int reclaim_str_hashtbl_size = 0;
254static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
255static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
256static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
257static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
258static struct list_head client_lru;
259static struct list_head close_lru;
260
261static inline void
262renew_client(struct nfs4_client *clp)
263{
264 /*
265 * Move client to the end to the LRU list.
266 */
267 dprintk("renewing client (clientid %08x/%08x)\n",
268 clp->cl_clientid.cl_boot,
269 clp->cl_clientid.cl_id);
270 list_move_tail(&clp->cl_lru, &client_lru);
271 clp->cl_time = get_seconds();
272}
273
274/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
275static int
276STALE_CLIENTID(clientid_t *clid)
277{
278 if (clid->cl_boot == boot_time)
279 return 0;
280 dprintk("NFSD stale clientid (%08x/%08x)\n",
281 clid->cl_boot, clid->cl_id);
282 return 1;
283}
284
285/*
286 * XXX Should we use a slab cache ?
287 * This type of memory management is somewhat inefficient, but we use it
288 * anyway since SETCLIENTID is not a common operation.
289 */
290static inline struct nfs4_client *
291alloc_client(struct xdr_netobj name)
292{
293 struct nfs4_client *clp;
294
295 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
296 memset(clp, 0, sizeof(*clp));
297 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
298 memcpy(clp->cl_name.data, name.data, name.len);
299 clp->cl_name.len = name.len;
300 }
301 else {
302 kfree(clp);
303 clp = NULL;
304 }
305 }
306 return clp;
307}
308
309static inline void
310free_client(struct nfs4_client *clp)
311{
312 if (clp->cl_cred.cr_group_info)
313 put_group_info(clp->cl_cred.cr_group_info);
314 kfree(clp->cl_name.data);
315 kfree(clp);
316}
317
318void
319put_nfs4_client(struct nfs4_client *clp)
320{
321 if (atomic_dec_and_test(&clp->cl_count))
322 free_client(clp);
323}
324
325static void
326expire_client(struct nfs4_client *clp)
327{
328 struct nfs4_stateowner *sop;
329 struct nfs4_delegation *dp;
330 struct nfs4_callback *cb = &clp->cl_callback;
331 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
332 struct list_head reaplist;
333
334 dprintk("NFSD: expire_client cl_count %d\n",
335 atomic_read(&clp->cl_count));
336
337 /* shutdown rpc client, ending any outstanding recall rpcs */
338 if (atomic_read(&cb->cb_set) == 1 && clnt) {
339 rpc_shutdown_client(clnt);
340 clnt = clp->cl_callback.cb_client = NULL;
341 }
342
343 INIT_LIST_HEAD(&reaplist);
344 spin_lock(&recall_lock);
345 while (!list_empty(&clp->cl_del_perclnt)) {
346 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
347 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
348 dp->dl_flock);
349 list_del_init(&dp->dl_del_perclnt);
350 list_move(&dp->dl_recall_lru, &reaplist);
351 }
352 spin_unlock(&recall_lock);
353 while (!list_empty(&reaplist)) {
354 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
355 list_del_init(&dp->dl_recall_lru);
356 unhash_delegation(dp);
357 }
358 list_del(&clp->cl_idhash);
359 list_del(&clp->cl_strhash);
360 list_del(&clp->cl_lru);
361 while (!list_empty(&clp->cl_perclient)) {
362 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
363 release_stateowner(sop);
364 }
365 put_nfs4_client(clp);
366}
367
368static struct nfs4_client *
a55370a3 369create_client(struct xdr_netobj name, char *recdir) {
1da177e4
LT		 370 struct nfs4_client *clp;
371
372 if (!(clp = alloc_client(name)))
373 goto out;
a55370a3 374 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1da177e4
LT		 375 atomic_set(&clp->cl_count, 1);
376 atomic_set(&clp->cl_callback.cb_set, 0);
377 clp->cl_callback.cb_parsed = 0;
378 INIT_LIST_HEAD(&clp->cl_idhash);
379 INIT_LIST_HEAD(&clp->cl_strhash);
380 INIT_LIST_HEAD(&clp->cl_perclient);
381 INIT_LIST_HEAD(&clp->cl_del_perclnt);
382 INIT_LIST_HEAD(&clp->cl_lru);
383out:
384 return clp;
385}
386
387static void
388copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
389 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
390}
391
392static void
393copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
394 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
395 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
396}
397
398static void
399copy_cred(struct svc_cred *target, struct svc_cred *source) {
400
401 target->cr_uid = source->cr_uid;
402 target->cr_gid = source->cr_gid;
403 target->cr_group_info = source->cr_group_info;
404 get_group_info(target->cr_group_info);
405}
406
a55370a3
N		 407static inline int
408same_name(const char *n1, const char *n2) {
409 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1da177e4
LT		 410}
411
412static int
413cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
414 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
415}
416
417static int
418cmp_clid(clientid_t * cl1, clientid_t * cl2) {
419 return((cl1->cl_boot == cl2->cl_boot) &&
420 (cl1->cl_id == cl2->cl_id));
421}
422
423/* XXX what about NGROUP */
424static int
425cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
426 return(cr1->cr_uid == cr2->cr_uid);
427
428}
429
430static void
431gen_clid(struct nfs4_client *clp) {
432 clp->cl_clientid.cl_boot = boot_time;
433 clp->cl_clientid.cl_id = current_clientid++;
434}
435
436static void
437gen_confirm(struct nfs4_client *clp) {
438 struct timespec tv;
439 u32 * p;
440
441 tv = CURRENT_TIME;
442 p = (u32 *)clp->cl_confirm.data;
443 *p++ = tv.tv_sec;
444 *p++ = tv.tv_nsec;
445}
446
447static int
448check_name(struct xdr_netobj name) {
449
450 if (name.len == 0)
451 return 0;
452 if (name.len > NFS4_OPAQUE_LIMIT) {
453 printk("NFSD: check_name: name too long(%d)!\n", name.len);
454 return 0;
455 }
456 return 1;
457}
458
459void
460add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
461{
462 unsigned int idhashval;
463
464 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
465 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
466 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
467 list_add_tail(&clp->cl_lru, &client_lru);
468 clp->cl_time = get_seconds();
469}
470
471void
472move_to_confirmed(struct nfs4_client *clp)
473{
474 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
475 unsigned int strhashval;
476
477 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
478 list_del_init(&clp->cl_strhash);
479 list_del_init(&clp->cl_idhash);
480 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
a55370a3 481 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4
LT		 482 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
483 renew_client(clp);
484}
485
486static struct nfs4_client *
487find_confirmed_client(clientid_t *clid)
488{
489 struct nfs4_client *clp;
490 unsigned int idhashval = clientid_hashval(clid->cl_id);
491
492 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
493 if (cmp_clid(&clp->cl_clientid, clid))
494 return clp;
495 }
496 return NULL;
497}
498
499static struct nfs4_client *
500find_unconfirmed_client(clientid_t *clid)
501{
502 struct nfs4_client *clp;
503 unsigned int idhashval = clientid_hashval(clid->cl_id);
504
505 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
506 if (cmp_clid(&clp->cl_clientid, clid))
507 return clp;
508 }
509 return NULL;
510}
511
512/* a helper function for parse_callback */
513static int
514parse_octet(unsigned int *lenp, char **addrp)
515{
516 unsigned int len = *lenp;
517 char *p = *addrp;
518 int n = -1;
519 char c;
520
521 for (;;) {
522 if (!len)
523 break;
524 len--;
525 c = *p++;
526 if (c == '.')
527 break;
528 if ((c < '0') || (c > '9')) {
529 n = -1;
530 break;
531 }
532 if (n < 0)
533 n = 0;
534 n = (n * 10) + (c - '0');
535 if (n > 255) {
536 n = -1;
537 break;
538 }
539 }
540 *lenp = len;
541 *addrp = p;
542 return n;
543}
544
545/* parse and set the setclientid ipv4 callback address */
546int
547parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
548{
549 int temp = 0;
550 u32 cbaddr = 0;
551 u16 cbport = 0;
552 u32 addrlen = addr_len;
553 char *addr = addr_val;
554 int i, shift;
555
556 /* ipaddress */
557 shift = 24;
558 for(i = 4; i > 0 ; i--) {
559 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
560 return 0;
561 }
562 cbaddr |= (temp << shift);
563 if (shift > 0)
564 shift -= 8;
565 }
566 *cbaddrp = cbaddr;
567
568 /* port */
569 shift = 8;
570 for(i = 2; i > 0 ; i--) {
571 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
572 return 0;
573 }
574 cbport |= (temp << shift);
575 if (shift > 0)
576 shift -= 8;
577 }
578 *cbportp = cbport;
579 return 1;
580}
581
582void
583gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
584{
585 struct nfs4_callback *cb = &clp->cl_callback;
586
587 /* Currently, we only support tcp for the callback channel */
588 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
589 goto out_err;
590
591 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
592 &cb->cb_addr, &cb->cb_port)))
593 goto out_err;
594 cb->cb_prog = se->se_callback_prog;
595 cb->cb_ident = se->se_callback_ident;
596 cb->cb_parsed = 1;
597 return;
598out_err:
599 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
600 "will not receive delegations\n",
601 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
602
603 cb->cb_parsed = 0;
604 return;
605}
606
607/*
608 * RFC 3010 has a complex implmentation description of processing a
609 * SETCLIENTID request consisting of 5 bullets, labeled as
610 * CASE0 - CASE4 below.
611 *
612 * NOTES:
613 * callback information will be processed in a future patch
614 *
615 * an unconfirmed record is added when:
616 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
617 * CASE 1: confirmed record found with matching name, principal,
618 * verifier, and clientid.
619 * CASE 2: confirmed record found with matching name, principal,
620 * and there is no unconfirmed record with matching
621 * name and principal
622 *
623 * an unconfirmed record is replaced when:
624 * CASE 3: confirmed record found with matching name, principal,
625 * and an unconfirmed record is found with matching
626 * name, principal, and with clientid and
627 * confirm that does not match the confirmed record.
628 * CASE 4: there is no confirmed record with matching name and
629 * principal. there is an unconfirmed record with
630 * matching name, principal.
631 *
632 * an unconfirmed record is deleted when:
633 * CASE 1: an unconfirmed record that matches input name, verifier,
634 * and confirmed clientid.
635 * CASE 4: any unconfirmed records with matching name and principal
636 * that exist after an unconfirmed record has been replaced
637 * as described above.
638 *
639 */
640int
641nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
642{
643 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
644 struct xdr_netobj clname = {
645 .len = setclid->se_namelen,
646 .data = setclid->se_name,
647 };
648 nfs4_verifier clverifier = setclid->se_verf;
649 unsigned int strhashval;
650 struct nfs4_client * conf, * unconf, * new, * clp;
651 int status;
a55370a3 652 char dname[HEXDIR_LEN];
1da177e4
LT		 653
654 status = nfserr_inval;
655 if (!check_name(clname))
656 goto out;
657
a55370a3
N		 658 status = nfs4_make_rec_clidname(dname, &clname);
659 if (status)
660 goto out;
661
1da177e4
LT		 662 /*
663 * XXX The Duplicate Request Cache (DRC) has been checked (??)
664 * We get here on a DRC miss.
665 */
666
a55370a3 667 strhashval = clientstr_hashval(dname);
1da177e4
LT		 668
669 conf = NULL;
670 nfs4_lock_state();
671 list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
a55370a3 672 if (!same_name(clp->cl_recdir, dname))
1da177e4
LT		 673 continue;
674 /*
675 * CASE 0:
676 * clname match, confirmed, different principal
677 * or different ip_address
678 */
679 status = nfserr_clid_inuse;
7dea9d28
N		 680 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)
681 || clp->cl_addr != ip_addr) {
1da177e4
LT		 682 printk("NFSD: setclientid: string in use by client"
683 "(clientid %08x/%08x)\n",
684 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
685 goto out;
686 }
1da177e4
LT		 687 conf = clp;
688 break;
689 }
690 unconf = NULL;
691 list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
a55370a3 692 if (!same_name(clp->cl_recdir, dname))
1da177e4
LT		 693 continue;
694 /* cl_name match from a previous SETCLIENTID operation */
695 unconf = clp;
696 break;
697 }
698 status = nfserr_resource;
699 if (!conf) {
700 /*
701 * CASE 4:
702 * placed first, because it is the normal case.
703 */
704 if (unconf)
705 expire_client(unconf);
a55370a3
N		 706 new = create_client(clname, dname);
707 if (new == NULL)
1da177e4
LT		 708 goto out;
709 copy_verf(new, &clverifier);
710 new->cl_addr = ip_addr;
711 copy_cred(&new->cl_cred,&rqstp->rq_cred);
712 gen_clid(new);
713 gen_confirm(new);
714 gen_callback(new, setclid);
715 add_to_unconfirmed(new, strhashval);
716 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
717 /*
718 * CASE 1:
719 * cl_name match, confirmed, principal match
720 * verifier match: probable callback update
721 *
722 * remove any unconfirmed nfs4_client with
723 * matching cl_name, cl_verifier, and cl_clientid
724 *
725 * create and insert an unconfirmed nfs4_client with same
726 * cl_name, cl_verifier, and cl_clientid as existing
727 * nfs4_client, but with the new callback info and a
728 * new cl_confirm
729 */
730 if ((unconf) &&
731 cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
732 cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
733 expire_client(unconf);
734 }
a55370a3
N		 735 new = create_client(clname, dname);
736 if (new == NULL)
1da177e4
LT		 737 goto out;
738 copy_verf(new,&conf->cl_verifier);
739 new->cl_addr = ip_addr;
740 copy_cred(&new->cl_cred,&rqstp->rq_cred);
741 copy_clid(new, conf);
742 gen_confirm(new);
743 gen_callback(new, setclid);
744 add_to_unconfirmed(new,strhashval);
745 } else if (!unconf) {
746 /*
747 * CASE 2:
748 * clname match, confirmed, principal match
749 * verfier does not match
750 * no unconfirmed. create a new unconfirmed nfs4_client
751 * using input clverifier, clname, and callback info
752 * and generate a new cl_clientid and cl_confirm.
753 */
a55370a3
N		 754 new = create_client(clname, dname);
755 if (new == NULL)
1da177e4
LT		 756 goto out;
757 copy_verf(new,&clverifier);
758 new->cl_addr = ip_addr;
759 copy_cred(&new->cl_cred,&rqstp->rq_cred);
760 gen_clid(new);
761 gen_confirm(new);
762 gen_callback(new, setclid);
763 add_to_unconfirmed(new, strhashval);
764 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
765 /*
766 * CASE3:
767 * confirmed found (name, principal match)
768 * confirmed verifier does not match input clverifier
769 *
770 * unconfirmed found (name match)
771 * confirmed->cl_confirm != unconfirmed->cl_confirm
772 *
773 * remove unconfirmed.
774 *
775 * create an unconfirmed nfs4_client
776 * with same cl_name as existing confirmed nfs4_client,
777 * but with new callback info, new cl_clientid,
778 * new cl_verifier and a new cl_confirm
779 */
780 expire_client(unconf);
a55370a3
N		 781 new = create_client(clname, dname);
782 if (new == NULL)
1da177e4
LT		 783 goto out;
784 copy_verf(new,&clverifier);
785 new->cl_addr = ip_addr;
786 copy_cred(&new->cl_cred,&rqstp->rq_cred);
787 gen_clid(new);
788 gen_confirm(new);
789 gen_callback(new, setclid);
790 add_to_unconfirmed(new, strhashval);
791 } else {
792 /* No cases hit !!! */
793 status = nfserr_inval;
794 goto out;
795
796 }
797 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
798 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
799 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
800 status = nfs_ok;
801out:
802 nfs4_unlock_state();
803 return status;
804}
805
806
807/*
808 * RFC 3010 has a complex implmentation description of processing a
809 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
810 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
811 *
812 * NOTE: callback information will be processed here in a future patch
813 */
814int
815nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
816{
817 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
818 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
819 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
820 clientid_t * clid = &setclientid_confirm->sc_clientid;
821 int status;
822
823 if (STALE_CLIENTID(clid))
824 return nfserr_stale_clientid;
825 /*
826 * XXX The Duplicate Request Cache (DRC) has been checked (??)
827 * We get here on a DRC miss.
828 */
829
830 nfs4_lock_state();
831 clp = find_confirmed_client(clid);
832 if (clp) {
833 status = nfserr_inval;
834 /*
835 * Found a record for this clientid. If the IP addresses
836 * don't match, return ERR_INVAL just as if the record had
837 * not been found.
838 */
839 if (clp->cl_addr != ip_addr) {
840 printk("NFSD: setclientid: string in use by client"
841 "(clientid %08x/%08x)\n",
842 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
843 goto out;
844 }
845 conf = clp;
846 }
847 clp = find_unconfirmed_client(clid);
848 if (clp) {
849 status = nfserr_inval;
850 if (clp->cl_addr != ip_addr) {
851 printk("NFSD: setclientid: string in use by client"
852 "(clientid %08x/%08x)\n",
853 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
854 goto out;
855 }
856 unconf = clp;
857 }
858 /* CASE 1:
859 * unconf record that matches input clientid and input confirm.
860 * conf record that matches input clientid.
861 * conf and unconf records match names, verifiers
862 */
863 if ((conf && unconf) &&
864 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
865 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
a55370a3 866 (same_name(conf->cl_recdir,unconf->cl_recdir)) &&
1da177e4
LT		 867 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
868 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
869 status = nfserr_clid_inuse;
870 else {
871 expire_client(conf);
872 clp = unconf;
873 move_to_confirmed(unconf);
874 status = nfs_ok;
875 }
876 goto out;
877 }
878 /* CASE 2:
879 * conf record that matches input clientid.
880 * if unconf record that matches input clientid, then unconf->cl_name
881 * or unconf->cl_verifier don't match the conf record.
882 */
883 if ((conf && !unconf) ||
884 ((conf && unconf) &&
885 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
a55370a3 886 !same_name(conf->cl_recdir, unconf->cl_recdir)))) {
1da177e4
LT		 887 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
888 status = nfserr_clid_inuse;
889 } else {
890 clp = conf;
891 status = nfs_ok;
892 }
893 goto out;
894 }
895 /* CASE 3:
896 * conf record not found.
897 * unconf record found.
898 * unconf->cl_confirm matches input confirm
899 */
900 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
901 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
902 status = nfserr_clid_inuse;
903 } else {
904 status = nfs_ok;
905 clp = unconf;
906 move_to_confirmed(unconf);
907 }
908 goto out;
909 }
910 /* CASE 4:
911 * conf record not found, or if conf, then conf->cl_confirm does not
912 * match input confirm.
913 * unconf record not found, or if unconf, then unconf->cl_confirm
914 * does not match input confirm.
915 */
916 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
917 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
918 status = nfserr_stale_clientid;
919 goto out;
920 }
921 /* check that we have hit one of the cases...*/
922 status = nfserr_inval;
923 goto out;
924out:
925 if (!status)
926 nfsd4_probe_callback(clp);
927 nfs4_unlock_state();
928 return status;
929}
930
931/*
932 * Open owner state (share locks)
933 */
934
935/* hash tables for nfs4_stateowner */
936#define OWNER_HASH_BITS 8
937#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
938#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
939
940#define ownerid_hashval(id) \
941 ((id) & OWNER_HASH_MASK)
942#define ownerstr_hashval(clientid, ownername) \
943 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
944
945static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
946static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
947
948/* hash table for nfs4_file */
949#define FILE_HASH_BITS 8
950#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
951#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
952/* hash table for (open)nfs4_stateid */
953#define STATEID_HASH_BITS 10
954#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
955#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
956
957#define file_hashval(x) \
958 hash_ptr(x, FILE_HASH_BITS)
959#define stateid_hashval(owner_id, file_id) \
960 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
961
962static struct list_head file_hashtbl[FILE_HASH_SIZE];
963static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
964
965/* OPEN Share state helper functions */
966static inline struct nfs4_file *
967alloc_init_file(struct inode *ino)
968{
969 struct nfs4_file *fp;
970 unsigned int hashval = file_hashval(ino);
971
e60d4398
N		 972 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
973 if (fp) {
13cd2184 974 kref_init(&fp->fi_ref);
1da177e4 975 INIT_LIST_HEAD(&fp->fi_hash);
8beefa24
N		 976 INIT_LIST_HEAD(&fp->fi_stateids);
977 INIT_LIST_HEAD(&fp->fi_delegations);
1da177e4
LT		 978 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
979 fp->fi_inode = igrab(ino);
980 fp->fi_id = current_fileid++;
1da177e4
LT		 981 return fp;
982 }
983 return NULL;
984}
985
e60d4398
N		 986static void
987nfsd4_free_slab(kmem_cache_t **slab)
1da177e4 988{
e60d4398
N		 989 int status;
990
991 if (*slab == NULL)
992 return;
993 status = kmem_cache_destroy(*slab);
994 *slab = NULL;
995 WARN_ON(status);
1da177e4
LT		 996}
997
998static void
999nfsd4_free_slabs(void)
1000{
e60d4398
N		 1001 nfsd4_free_slab(&stateowner_slab);
1002 nfsd4_free_slab(&file_slab);
5ac049ac 1003 nfsd4_free_slab(&stateid_slab);
5b2d21c1 1004 nfsd4_free_slab(&deleg_slab);
e60d4398 1005}
1da177e4 1006
e60d4398
N		 1007static int
1008nfsd4_init_slabs(void)
1009{
1010 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1011 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1012 if (stateowner_slab == NULL)
1013 goto out_nomem;
1014 file_slab = kmem_cache_create("nfsd4_files",
1015 sizeof(struct nfs4_file), 0, 0, NULL, NULL);
1016 if (file_slab == NULL)
1017 goto out_nomem;
5ac049ac
N		 1018 stateid_slab = kmem_cache_create("nfsd4_stateids",
1019 sizeof(struct nfs4_stateid), 0, 0, NULL, NULL);
1020 if (stateid_slab == NULL)
1021 goto out_nomem;
5b2d21c1
N		 1022 deleg_slab = kmem_cache_create("nfsd4_delegations",
1023 sizeof(struct nfs4_delegation), 0, 0, NULL, NULL);
1024 if (deleg_slab == NULL)
1025 goto out_nomem;
e60d4398
N		 1026 return 0;
1027out_nomem:
1028 nfsd4_free_slabs();
1029 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1030 return -ENOMEM;
1da177e4
LT		 1031}
1032
1033void
1034nfs4_free_stateowner(struct kref *kref)
1035{
1036 struct nfs4_stateowner *sop =
1037 container_of(kref, struct nfs4_stateowner, so_ref);
1038 kfree(sop->so_owner.data);
1039 kmem_cache_free(stateowner_slab, sop);
1040}
1041
1042static inline struct nfs4_stateowner *
1043alloc_stateowner(struct xdr_netobj *owner)
1044{
1045 struct nfs4_stateowner *sop;
1046
1047 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1048 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1049 memcpy(sop->so_owner.data, owner->data, owner->len);
1050 sop->so_owner.len = owner->len;
1051 kref_init(&sop->so_ref);
1052 return sop;
1053 }
1054 kmem_cache_free(stateowner_slab, sop);
1055 }
1056 return NULL;
1057}
1058
1059static struct nfs4_stateowner *
1060alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1061 struct nfs4_stateowner *sop;
1062 struct nfs4_replay *rp;
1063 unsigned int idhashval;
1064
1065 if (!(sop = alloc_stateowner(&open->op_owner)))
1066 return NULL;
1067 idhashval = ownerid_hashval(current_ownerid);
1068 INIT_LIST_HEAD(&sop->so_idhash);
1069 INIT_LIST_HEAD(&sop->so_strhash);
1070 INIT_LIST_HEAD(&sop->so_perclient);
1071 INIT_LIST_HEAD(&sop->so_perfilestate);
1072 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1073 INIT_LIST_HEAD(&sop->so_close_lru);
1074 sop->so_time = 0;
1075 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1076 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1077 list_add(&sop->so_perclient, &clp->cl_perclient);
1da177e4
LT		 1078 sop->so_is_open_owner = 1;
1079 sop->so_id = current_ownerid++;
1080 sop->so_client = clp;
1081 sop->so_seqid = open->op_seqid;
1082 sop->so_confirmed = 0;
1083 rp = &sop->so_replay;
1084 rp->rp_status = NFSERR_SERVERFAULT;
1085 rp->rp_buflen = 0;
1086 rp->rp_buf = rp->rp_ibuf;
1087 return sop;
1088}
1089
1090static void
1091release_stateid_lockowners(struct nfs4_stateid *open_stp)
1092{
1093 struct nfs4_stateowner *lock_sop;
1094
1095 while (!list_empty(&open_stp->st_perlockowner)) {
1096 lock_sop = list_entry(open_stp->st_perlockowner.next,
1097 struct nfs4_stateowner, so_perlockowner);
1098 /* list_del(&open_stp->st_perlockowner); */
1099 BUG_ON(lock_sop->so_is_open_owner);
1100 release_stateowner(lock_sop);
1101 }
1102}
1103
1104static void
1105unhash_stateowner(struct nfs4_stateowner *sop)
1106{
1107 struct nfs4_stateid *stp;
1108
1109 list_del(&sop->so_idhash);
1110 list_del(&sop->so_strhash);
6fa305de 1111 if (sop->so_is_open_owner)
1da177e4 1112 list_del(&sop->so_perclient);
1da177e4
LT		 1113 list_del(&sop->so_perlockowner);
1114 while (!list_empty(&sop->so_perfilestate)) {
1115 stp = list_entry(sop->so_perfilestate.next,
1116 struct nfs4_stateid, st_perfilestate);
1117 if (sop->so_is_open_owner)
1118 release_stateid(stp, OPEN_STATE);
1119 else
1120 release_stateid(stp, LOCK_STATE);
1121 }
1122}
1123
1124static void
1125release_stateowner(struct nfs4_stateowner *sop)
1126{
1127 unhash_stateowner(sop);
1128 list_del(&sop->so_close_lru);
1129 nfs4_put_stateowner(sop);
1130}
1131
1132static inline void
1133init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1134 struct nfs4_stateowner *sop = open->op_stateowner;
1135 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1136
1137 INIT_LIST_HEAD(&stp->st_hash);
1138 INIT_LIST_HEAD(&stp->st_perfilestate);
1139 INIT_LIST_HEAD(&stp->st_perlockowner);
1140 INIT_LIST_HEAD(&stp->st_perfile);
1141 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1142 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
8beefa24 1143 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4 1144 stp->st_stateowner = sop;
13cd2184 1145 get_nfs4_file(fp);
1da177e4
LT		 1146 stp->st_file = fp;
1147 stp->st_stateid.si_boot = boot_time;
1148 stp->st_stateid.si_stateownerid = sop->so_id;
1149 stp->st_stateid.si_fileid = fp->fi_id;
1150 stp->st_stateid.si_generation = 0;
1151 stp->st_access_bmap = 0;
1152 stp->st_deny_bmap = 0;
1153 __set_bit(open->op_share_access, &stp->st_access_bmap);
1154 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1155}
1156
1157static void
1158release_stateid(struct nfs4_stateid *stp, int flags)
1159{
1160 struct file *filp = stp->st_vfs_file;
1161
1162 list_del(&stp->st_hash);
1da177e4
LT		 1163 list_del(&stp->st_perfile);
1164 list_del(&stp->st_perfilestate);
1165 if (flags & OPEN_STATE) {
1166 release_stateid_lockowners(stp);
1167 stp->st_vfs_file = NULL;
1168 nfsd_close(filp);
1da177e4
LT		 1169 } else if (flags & LOCK_STATE)
1170 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
13cd2184 1171 put_nfs4_file(stp->st_file);
5ac049ac 1172 kmem_cache_free(stateid_slab, stp);
1da177e4
LT		 1173 stp = NULL;
1174}
1175
1da177e4
LT		 1176void
1177move_to_close_lru(struct nfs4_stateowner *sop)
1178{
1179 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1180
1181 unhash_stateowner(sop);
1182 list_add_tail(&sop->so_close_lru, &close_lru);
1183 sop->so_time = get_seconds();
1184}
1185
1186void
1187release_state_owner(struct nfs4_stateid *stp, int flag)
1188{
1189 struct nfs4_stateowner *sop = stp->st_stateowner;
1da177e4
LT		 1190
1191 dprintk("NFSD: release_state_owner\n");
1192 release_stateid(stp, flag);
1193
1194 /* place unused nfs4_stateowners on so_close_lru list to be
1195 * released by the laundromat service after the lease period
1196 * to enable us to handle CLOSE replay
1197 */
1198 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1199 move_to_close_lru(sop);
1da177e4
LT		 1200}
1201
1202static int
1203cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1204 return ((sop->so_owner.len == owner->len) &&
1205 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1206 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1207}
1208
1209static struct nfs4_stateowner *
1210find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1211{
1212 struct nfs4_stateowner *so = NULL;
1213
1214 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1215 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1216 return so;
1217 }
1218 return NULL;
1219}
1220
1221/* search file_hashtbl[] for file */
1222static struct nfs4_file *
1223find_file(struct inode *ino)
1224{
1225 unsigned int hashval = file_hashval(ino);
1226 struct nfs4_file *fp;
1227
1228 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
13cd2184
N		 1229 if (fp->fi_inode == ino) {
1230 get_nfs4_file(fp);
1da177e4 1231 return fp;
13cd2184 1232 }
1da177e4
LT		 1233 }
1234 return NULL;
1235}
1236
1237#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1238#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1239
1240void
1241set_access(unsigned int *access, unsigned long bmap) {
1242 int i;
1243
1244 *access = 0;
1245 for (i = 1; i < 4; i++) {
1246 if (test_bit(i, &bmap))
1247 *access |= i;
1248 }
1249}
1250
1251void
1252set_deny(unsigned int *deny, unsigned long bmap) {
1253 int i;
1254
1255 *deny = 0;
1256 for (i = 0; i < 4; i++) {
1257 if (test_bit(i, &bmap))
1258 *deny |= i ;
1259 }
1260}
1261
1262static int
1263test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1264 unsigned int access, deny;
1265
1266 set_access(&access, stp->st_access_bmap);
1267 set_deny(&deny, stp->st_deny_bmap);
1268 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1269 return 0;
1270 return 1;
1271}
1272
1273/*
1274 * Called to check deny when READ with all zero stateid or
1275 * WRITE with all zero or all one stateid
1276 */
1277int
1278nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1279{
1280 struct inode *ino = current_fh->fh_dentry->d_inode;
1281 struct nfs4_file *fp;
1282 struct nfs4_stateid *stp;
13cd2184 1283 int ret;
1da177e4
LT		 1284
1285 dprintk("NFSD: nfs4_share_conflict\n");
1286
1287 fp = find_file(ino);
13cd2184
N		 1288 if (!fp)
1289 return nfs_ok;
1290 ret = nfserr_share_denied;
1da177e4 1291 /* Search for conflicting share reservations */
13cd2184
N		 1292 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1293 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1294 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1295 goto out;
1da177e4 1296 }
13cd2184
N		 1297 ret = nfs_ok;
1298out:
1299 put_nfs4_file(fp);
1300 return ret;
1da177e4
LT		 1301}
1302
1303static inline void
1304nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1305{
1306 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1307 put_write_access(filp->f_dentry->d_inode);
1308 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1309 }
1310}
1311
1312/*
1313 * Recall a delegation
1314 */
1315static int
1316do_recall(void *__dp)
1317{
1318 struct nfs4_delegation *dp = __dp;
1319
1320 daemonize("nfsv4-recall");
1321
1322 nfsd4_cb_recall(dp);
1323 return 0;
1324}
1325
1326/*
1327 * Spawn a thread to perform a recall on the delegation represented
1328 * by the lease (file_lock)
1329 *
1330 * Called from break_lease() with lock_kernel() held.
1331 * Note: we assume break_lease will only call this *once* for any given
1332 * lease.
1333 */
1334static
1335void nfsd_break_deleg_cb(struct file_lock *fl)
1336{
1337 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1338 struct task_struct *t;
1339
1340 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1341 if (!dp)
1342 return;
1343
1344 /* We're assuming the state code never drops its reference
1345 * without first removing the lease. Since we're in this lease
1346 * callback (and since the lease code is serialized by the kernel
1347 * lock) we know the server hasn't removed the lease yet, we know
1348 * it's safe to take a reference: */
1349 atomic_inc(&dp->dl_count);
1350
1351 spin_lock(&recall_lock);
1352 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1353 spin_unlock(&recall_lock);
1354
1355 /* only place dl_time is set. protected by lock_kernel*/
1356 dp->dl_time = get_seconds();
1357
1358 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1359 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1360
1361 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1362 if (IS_ERR(t)) {
1363 struct nfs4_client *clp = dp->dl_client;
1364
1365 printk(KERN_INFO "NFSD: Callback thread failed for "
1366 "for client (clientid %08x/%08x)\n",
1367 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1368 nfs4_put_delegation(dp);
1369 }
1370}
1371
1372/*
1373 * The file_lock is being reapd.
1374 *
1375 * Called by locks_free_lock() with lock_kernel() held.
1376 */
1377static
1378void nfsd_release_deleg_cb(struct file_lock *fl)
1379{
1380 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1381
1382 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1383
1384 if (!(fl->fl_flags & FL_LEASE) || !dp)
1385 return;
1386 dp->dl_flock = NULL;
1387}
1388
1389/*
1390 * Set the delegation file_lock back pointer.
1391 *
1392 * Called from __setlease() with lock_kernel() held.
1393 */
1394static
1395void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1396{
1397 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1398
1399 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1400 if (!dp)
1401 return;
1402 dp->dl_flock = new;
1403}
1404
1405/*
1406 * Called from __setlease() with lock_kernel() held
1407 */
1408static
1409int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1410{
1411 struct nfs4_delegation *onlistd =
1412 (struct nfs4_delegation *)onlist->fl_owner;
1413 struct nfs4_delegation *tryd =
1414 (struct nfs4_delegation *)try->fl_owner;
1415
1416 if (onlist->fl_lmops != try->fl_lmops)
1417 return 0;
1418
1419 return onlistd->dl_client == tryd->dl_client;
1420}
1421
1422
1423static
1424int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1425{
1426 if (arg & F_UNLCK)
1427 return lease_modify(onlist, arg);
1428 else
1429 return -EAGAIN;
1430}
1431
1432struct lock_manager_operations nfsd_lease_mng_ops = {
1433 .fl_break = nfsd_break_deleg_cb,
1434 .fl_release_private = nfsd_release_deleg_cb,
1435 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1436 .fl_mylease = nfsd_same_client_deleg_cb,
1437 .fl_change = nfsd_change_deleg_cb,
1438};
1439
1440
1441/*
1442 * nfsd4_process_open1()
1443 * lookup stateowner.
1444 * found:
1445 * check confirmed
1446 * confirmed:
1447 * check seqid
1448 * not confirmed:
1449 * delete owner
1450 * create new owner
1451 * notfound:
1452 * verify clientid
1453 * create new owner
1454 *
1455 * called with nfs4_lock_state() held.
1456 */
1457int
1458nfsd4_process_open1(struct nfsd4_open *open)
1459{
1460 int status;
1461 clientid_t *clientid = &open->op_clientid;
1462 struct nfs4_client *clp = NULL;
1463 unsigned int strhashval;
1464 struct nfs4_stateowner *sop = NULL;
1465
1466 status = nfserr_inval;
1467 if (!check_name(open->op_owner))
1468 goto out;
1469
1470 if (STALE_CLIENTID(&open->op_clientid))
1471 return nfserr_stale_clientid;
1472
1473 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1474 sop = find_openstateowner_str(strhashval, open);
1475 if (sop) {
1476 open->op_stateowner = sop;
1477 /* check for replay */
1478 if (open->op_seqid == sop->so_seqid){
1479 if (sop->so_replay.rp_buflen)
1480 return NFSERR_REPLAY_ME;
1481 else {
1482 /* The original OPEN failed so spectacularly
1483 * that we don't even have replay data saved!
1484 * Therefore, we have no choice but to continue
1485 * processing this OPEN; presumably, we'll
1486 * fail again for the same reason.
1487 */
1488 dprintk("nfsd4_process_open1:"
1489 " replay with no replay cache\n");
1490 goto renew;
1491 }
1492 } else if (sop->so_confirmed) {
1493 if (open->op_seqid == sop->so_seqid + 1)
1494 goto renew;
1495 status = nfserr_bad_seqid;
1496 goto out;
1497 } else {
1498 /* If we get here, we received an OPEN for an
1499 * unconfirmed nfs4_stateowner. Since the seqid's are
1500 * different, purge the existing nfs4_stateowner, and
1501 * instantiate a new one.
1502 */
1503 clp = sop->so_client;
1504 release_stateowner(sop);
1505 }
1506 } else {
1507 /* nfs4_stateowner not found.
1508 * Verify clientid and instantiate new nfs4_stateowner.
1509 * If verify fails this is presumably the result of the
1510 * client's lease expiring.
1511 */
1512 status = nfserr_expired;
1513 clp = find_confirmed_client(clientid);
1514 if (clp == NULL)
1515 goto out;
1516 }
1517 status = nfserr_resource;
1518 sop = alloc_init_open_stateowner(strhashval, clp, open);
1519 if (sop == NULL)
1520 goto out;
1521 open->op_stateowner = sop;
1522renew:
1523 status = nfs_ok;
1524 renew_client(sop->so_client);
1525out:
1526 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1527 status = nfserr_reclaim_bad;
1528 return status;
1529}
1530
4a6e43e6
N		 1531static inline int
1532nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1533{
1534 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1535 return nfserr_openmode;
1536 else
1537 return nfs_ok;
1538}
1539
52f4fb43
N		 1540static struct nfs4_delegation *
1541find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1542{
1543 struct nfs4_delegation *dp;
1544
8beefa24 1545 list_for_each_entry(dp, &fp->fi_delegations, dl_del_perfile) {
52f4fb43
N		 1546 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1547 return dp;
1548 }
1549 return NULL;
1550}
1551
c44c5eeb 1552static int
567d9829
N		 1553nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1554 struct nfs4_delegation **dp)
1555{
1556 int flags;
c44c5eeb 1557 int status = nfserr_bad_stateid;
567d9829
N		 1558
1559 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1560 if (*dp == NULL)
c44c5eeb 1561 goto out;
567d9829
N		 1562 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1563 RD_STATE : WR_STATE;
1564 status = nfs4_check_delegmode(*dp, flags);
1565 if (status)
1566 *dp = NULL;
c44c5eeb
N		 1567out:
1568 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1569 return nfs_ok;
1570 if (status)
1571 return status;
1572 open->op_stateowner->so_confirmed = 1;
1573 return nfs_ok;
567d9829
N		 1574}
1575
1da177e4
LT		 1576static int
1577nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1578{
1579 struct nfs4_stateid *local;
1580 int status = nfserr_share_denied;
1581 struct nfs4_stateowner *sop = open->op_stateowner;
1582
8beefa24 1583 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1da177e4
LT		 1584 /* ignore lock owners */
1585 if (local->st_stateowner->so_is_open_owner == 0)
1586 continue;
1587 /* remember if we have seen this open owner */
1588 if (local->st_stateowner == sop)
1589 *stpp = local;
1590 /* check for conflicting share reservations */
1591 if (!test_share(local, open))
1592 goto out;
1593 }
1594 status = 0;
1595out:
1596 return status;
1597}
1598
5ac049ac
N		 1599static inline struct nfs4_stateid *
1600nfs4_alloc_stateid(void)
1601{
1602 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1603}
1604
1da177e4
LT		 1605static int
1606nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
567d9829 1607 struct nfs4_delegation *dp,
1da177e4
LT		 1608 struct svc_fh *cur_fh, int flags)
1609{
1610 struct nfs4_stateid *stp;
1da177e4 1611
5ac049ac 1612 stp = nfs4_alloc_stateid();
1da177e4
LT		 1613 if (stp == NULL)
1614 return nfserr_resource;
1615
567d9829
N		 1616 if (dp) {
1617 get_file(dp->dl_vfs_file);
1618 stp->st_vfs_file = dp->dl_vfs_file;
1619 } else {
1620 int status;
1621 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1622 &stp->st_vfs_file);
1623 if (status) {
1624 if (status == nfserr_dropit)
1625 status = nfserr_jukebox;
5ac049ac 1626 kmem_cache_free(stateid_slab, stp);
567d9829
N		 1627 return status;
1628 }
1da177e4 1629 }
1da177e4
LT		 1630 *stpp = stp;
1631 return 0;
1632}
1633
1634static inline int
1635nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1636 struct nfsd4_open *open)
1637{
1638 struct iattr iattr = {
1639 .ia_valid = ATTR_SIZE,
1640 .ia_size = 0,
1641 };
1642 if (!open->op_truncate)
1643 return 0;
1644 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1645 return -EINVAL;
1646 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1647}
1648
1649static int
1650nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1651{
1652 struct file *filp = stp->st_vfs_file;
1653 struct inode *inode = filp->f_dentry->d_inode;
1654 unsigned int share_access;
1655 int status;
1656
1657 set_access(&share_access, stp->st_access_bmap);
1658 share_access = ~share_access;
1659 share_access &= open->op_share_access;
1660
1661 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1662 return nfsd4_truncate(rqstp, cur_fh, open);
1663
1664 status = get_write_access(inode);
1665 if (status)
1666 return nfserrno(status);
1667 status = nfsd4_truncate(rqstp, cur_fh, open);
1668 if (status) {
1669 put_write_access(inode);
1670 return status;
1671 }
1672 /* remember the open */
1673 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1674 set_bit(open->op_share_access, &stp->st_access_bmap);
1675 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1676
1677 return nfs_ok;
1678}
1679
1680
1681/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1682static void
1683nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1684{
1685 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1686 if (*status)
1687 *status = nfserr_reclaim_bad;
1688 else {
1689 open->op_stateowner->so_confirmed = 1;
1690 open->op_stateowner->so_seqid--;
1691 }
1692 }
1693}
1694
1695/*
1696 * Attempt to hand out a delegation.
1697 */
1698static void
1699nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1700{
1701 struct nfs4_delegation *dp;
1702 struct nfs4_stateowner *sop = stp->st_stateowner;
1703 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1704 struct file_lock fl, *flp = &fl;
1705 int status, flag = 0;
1706
1707 flag = NFS4_OPEN_DELEGATE_NONE;
7b190fec
N		 1708 open->op_recall = 0;
1709 switch (open->op_claim_type) {
1710 case NFS4_OPEN_CLAIM_PREVIOUS:
1711 if (!atomic_read(&cb->cb_set))
1712 open->op_recall = 1;
1713 flag = open->op_delegate_type;
1714 if (flag == NFS4_OPEN_DELEGATE_NONE)
1715 goto out;
1716 break;
1717 case NFS4_OPEN_CLAIM_NULL:
1718 /* Let's not give out any delegations till everyone's
1719 * had the chance to reclaim theirs.... */
1720 if (nfs4_in_grace())
1721 goto out;
1722 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1723 goto out;
1724 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1725 flag = NFS4_OPEN_DELEGATE_WRITE;
1726 else
1727 flag = NFS4_OPEN_DELEGATE_READ;
1728 break;
1729 default:
1730 goto out;
1731 }
1da177e4
LT		 1732
1733 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1734 if (dp == NULL) {
1735 flag = NFS4_OPEN_DELEGATE_NONE;
1736 goto out;
1737 }
1738 locks_init_lock(&fl);
1739 fl.fl_lmops = &nfsd_lease_mng_ops;
1740 fl.fl_flags = FL_LEASE;
1741 fl.fl_end = OFFSET_MAX;
1742 fl.fl_owner = (fl_owner_t)dp;
1743 fl.fl_file = stp->st_vfs_file;
1744 fl.fl_pid = current->tgid;
1745
1746 /* setlease checks to see if delegation should be handed out.
1747 * the lock_manager callbacks fl_mylease and fl_change are used
1748 */
1749 if ((status = setlease(stp->st_vfs_file,
1750 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1751 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1752 unhash_delegation(dp);
1da177e4
LT		 1753 flag = NFS4_OPEN_DELEGATE_NONE;
1754 goto out;
1755 }
1756
1757 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1758
1759 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1760 dp->dl_stateid.si_boot,
1761 dp->dl_stateid.si_stateownerid,
1762 dp->dl_stateid.si_fileid,
1763 dp->dl_stateid.si_generation);
1764out:
7b190fec
N		 1765 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1766 && flag == NFS4_OPEN_DELEGATE_NONE
1767 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1768 printk("NFSD: WARNING: refusing delegation reclaim\n");
1da177e4
LT		 1769 open->op_delegate_type = flag;
1770}
1771
1772/*
1773 * called with nfs4_lock_state() held.
1774 */
1775int
1776nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1777{
1778 struct nfs4_file *fp = NULL;
1779 struct inode *ino = current_fh->fh_dentry->d_inode;
1780 struct nfs4_stateid *stp = NULL;
567d9829 1781 struct nfs4_delegation *dp = NULL;
1da177e4
LT		 1782 int status;
1783
1784 status = nfserr_inval;
1785 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1786 goto out;
1787 /*
1788 * Lookup file; if found, lookup stateid and check open request,
1789 * and check for delegations in the process of being recalled.
1790 * If not found, create the nfs4_file struct
1791 */
1792 fp = find_file(ino);
1793 if (fp) {
1794 if ((status = nfs4_check_open(fp, open, &stp)))
1795 goto out;
c44c5eeb
N		 1796 status = nfs4_check_deleg(fp, open, &dp);
1797 if (status)
1798 goto out;
1da177e4 1799 } else {
c44c5eeb
N		 1800 status = nfserr_bad_stateid;
1801 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1802 goto out;
1da177e4
LT		 1803 status = nfserr_resource;
1804 fp = alloc_init_file(ino);
1805 if (fp == NULL)
1806 goto out;
1807 }
1808
1809 /*
1810 * OPEN the file, or upgrade an existing OPEN.
1811 * If truncate fails, the OPEN fails.
1812 */
1813 if (stp) {
1814 /* Stateid was found, this is an OPEN upgrade */
1815 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1816 if (status)
1817 goto out;
1818 } else {
1819 /* Stateid was not found, this is a new OPEN */
1820 int flags = 0;
1821 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1822 flags = MAY_WRITE;
1823 else
1824 flags = MAY_READ;
567d9829
N		 1825 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1826 if (status)
1da177e4
LT		 1827 goto out;
1828 init_stateid(stp, fp, open);
1829 status = nfsd4_truncate(rqstp, current_fh, open);
1830 if (status) {
1831 release_stateid(stp, OPEN_STATE);
1832 goto out;
1833 }
1834 }
1835 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1836
1837 /*
1838 * Attempt to hand out a delegation. No error return, because the
1839 * OPEN succeeds even if we fail.
1840 */
1841 nfs4_open_delegation(current_fh, open, stp);
1842
1843 status = nfs_ok;
1844
1845 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1846 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1847 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1848out:
13cd2184
N		 1849 if (fp)
1850 put_nfs4_file(fp);
1da177e4
LT		 1851 /* CLAIM_PREVIOUS has different error returns */
1852 nfs4_set_claim_prev(open, &status);
1853 /*
1854 * To finish the open response, we just need to set the rflags.
1855 */
1856 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1857 if (!open->op_stateowner->so_confirmed)
1858 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1859
1860 return status;
1861}
1862
58da282b 1863static struct workqueue_struct *laundry_wq;
1da177e4
LT		 1864static struct work_struct laundromat_work;
1865static void laundromat_main(void *);
1866static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1867
1868int
1869nfsd4_renew(clientid_t *clid)
1870{
1871 struct nfs4_client *clp;
1872 int status;
1873
1874 nfs4_lock_state();
1875 dprintk("process_renew(%08x/%08x): starting\n",
1876 clid->cl_boot, clid->cl_id);
1877 status = nfserr_stale_clientid;
1878 if (STALE_CLIENTID(clid))
1879 goto out;
1880 clp = find_confirmed_client(clid);
1881 status = nfserr_expired;
1882 if (clp == NULL) {
1883 /* We assume the client took too long to RENEW. */
1884 dprintk("nfsd4_renew: clientid not found!\n");
1885 goto out;
1886 }
1887 renew_client(clp);
1888 status = nfserr_cb_path_down;
1889 if (!list_empty(&clp->cl_del_perclnt)
1890 && !atomic_read(&clp->cl_callback.cb_set))
1891 goto out;
1892 status = nfs_ok;
1893out:
1894 nfs4_unlock_state();
1895 return status;
1896}
1897
1898time_t
1899nfs4_laundromat(void)
1900{
1901 struct nfs4_client *clp;
1902 struct nfs4_stateowner *sop;
1903 struct nfs4_delegation *dp;
1904 struct list_head *pos, *next, reaplist;
1905 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1906 time_t t, clientid_val = NFSD_LEASE_TIME;
1907 time_t u, test_val = NFSD_LEASE_TIME;
1908
1909 nfs4_lock_state();
1910
1911 dprintk("NFSD: laundromat service - starting\n");
1912 list_for_each_safe(pos, next, &client_lru) {
1913 clp = list_entry(pos, struct nfs4_client, cl_lru);
1914 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1915 t = clp->cl_time - cutoff;
1916 if (clientid_val > t)
1917 clientid_val = t;
1918 break;
1919 }
1920 dprintk("NFSD: purging unused client (clientid %08x)\n",
1921 clp->cl_clientid.cl_id);
1922 expire_client(clp);
1923 }
1924 INIT_LIST_HEAD(&reaplist);
1925 spin_lock(&recall_lock);
1926 list_for_each_safe(pos, next, &del_recall_lru) {
1927 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1928 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1929 u = dp->dl_time - cutoff;
1930 if (test_val > u)
1931 test_val = u;
1932 break;
1933 }
1934 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1935 dp, dp->dl_flock);
1936 list_move(&dp->dl_recall_lru, &reaplist);
1937 }
1938 spin_unlock(&recall_lock);
1939 list_for_each_safe(pos, next, &reaplist) {
1940 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1941 list_del_init(&dp->dl_recall_lru);
1942 unhash_delegation(dp);
1943 }
1944 test_val = NFSD_LEASE_TIME;
1945 list_for_each_safe(pos, next, &close_lru) {
1946 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1947 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1948 u = sop->so_time - cutoff;
1949 if (test_val > u)
1950 test_val = u;
1951 break;
1952 }
1953 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1954 sop->so_id);
1955 list_del(&sop->so_close_lru);
1956 nfs4_put_stateowner(sop);
1957 }
1958 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1959 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1960 nfs4_unlock_state();
1961 return clientid_val;
1962}
1963
1964void
1965laundromat_main(void *not_used)
1966{
1967 time_t t;
1968
1969 t = nfs4_laundromat();
1970 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
58da282b 1971 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1da177e4
LT		 1972}
1973
1974/* search ownerid_hashtbl[] and close_lru for stateid owner
1975 * (stateid->si_stateownerid)
1976 */
1977struct nfs4_stateowner *
1978find_openstateowner_id(u32 st_id, int flags) {
1979 struct nfs4_stateowner *local = NULL;
1980
1981 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1982 if (flags & CLOSE_STATE) {
1983 list_for_each_entry(local, &close_lru, so_close_lru) {
1984 if (local->so_id == st_id)
1985 return local;
1986 }
1987 }
1988 return NULL;
1989}
1990
1991static inline int
1992nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1993{
1994 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1995}
1996
1997static int
1998STALE_STATEID(stateid_t *stateid)
1999{
2000 if (stateid->si_boot == boot_time)
2001 return 0;
2002 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
2003 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2004 stateid->si_generation);
2005 return 1;
2006}
2007
2008static inline int
2009access_permit_read(unsigned long access_bmap)
2010{
2011 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2012 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2013 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2014}
2015
2016static inline int
2017access_permit_write(unsigned long access_bmap)
2018{
2019 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2020 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2021}
2022
2023static
2024int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2025{
2026 int status = nfserr_openmode;
2027
2028 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2029 goto out;
2030 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2031 goto out;
2032 status = nfs_ok;
2033out:
2034 return status;
2035}
2036
1da177e4
LT		 2037static inline int
2038check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2039{
2040 /* Trying to call delegreturn with a special stateid? Yuch: */
2041 if (!(flags & (RD_STATE | WR_STATE)))
2042 return nfserr_bad_stateid;
2043 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2044 return nfs_ok;
2045 else if (nfs4_in_grace()) {
2046 /* Answer in remaining cases depends on existance of
2047 * conflicting state; so we must wait out the grace period. */
2048 return nfserr_grace;
2049 } else if (flags & WR_STATE)
2050 return nfs4_share_conflict(current_fh,
2051 NFS4_SHARE_DENY_WRITE);
2052 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2053 return nfs4_share_conflict(current_fh,
2054 NFS4_SHARE_DENY_READ);
2055}
2056
2057/*
2058 * Allow READ/WRITE during grace period on recovered state only for files
2059 * that are not able to provide mandatory locking.
2060 */
2061static inline int
2062io_during_grace_disallowed(struct inode *inode, int flags)
2063{
2064 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2065 && MANDATORY_LOCK(inode);
2066}
2067
2068/*
2069* Checks for stateid operations
2070*/
2071int
2072nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2073{
2074 struct nfs4_stateid *stp = NULL;
2075 struct nfs4_delegation *dp = NULL;
2076 stateid_t *stidp;
2077 struct inode *ino = current_fh->fh_dentry->d_inode;
2078 int status;
2079
2080 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2081 stateid->si_boot, stateid->si_stateownerid,
2082 stateid->si_fileid, stateid->si_generation);
2083 if (filpp)
2084 *filpp = NULL;
2085
2086 if (io_during_grace_disallowed(ino, flags))
2087 return nfserr_grace;
2088
2089 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2090 return check_special_stateids(current_fh, stateid, flags);
2091
2092 /* STALE STATEID */
2093 status = nfserr_stale_stateid;
2094 if (STALE_STATEID(stateid))
2095 goto out;
2096
2097 /* BAD STATEID */
2098 status = nfserr_bad_stateid;
2099 if (!stateid->si_fileid) { /* delegation stateid */
2100 if(!(dp = find_delegation_stateid(ino, stateid))) {
2101 dprintk("NFSD: delegation stateid not found\n");
2102 if (nfs4_in_grace())
2103 status = nfserr_grace;
2104 goto out;
2105 }
2106 stidp = &dp->dl_stateid;
2107 } else { /* open or lock stateid */
2108 if (!(stp = find_stateid(stateid, flags))) {
2109 dprintk("NFSD: open or lock stateid not found\n");
2110 if (nfs4_in_grace())
2111 status = nfserr_grace;
2112 goto out;
2113 }
2114 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2115 goto out;
2116 if (!stp->st_stateowner->so_confirmed)
2117 goto out;
2118 stidp = &stp->st_stateid;
2119 }
2120 if (stateid->si_generation > stidp->si_generation)
2121 goto out;
2122
2123 /* OLD STATEID */
2124 status = nfserr_old_stateid;
2125 if (stateid->si_generation < stidp->si_generation)
2126 goto out;
2127 if (stp) {
2128 if ((status = nfs4_check_openmode(stp,flags)))
2129 goto out;
2130 renew_client(stp->st_stateowner->so_client);
2131 if (filpp)
2132 *filpp = stp->st_vfs_file;
2133 } else if (dp) {
2134 if ((status = nfs4_check_delegmode(dp, flags)))
2135 goto out;
2136 renew_client(dp->dl_client);
2137 if (flags & DELEG_RET)
2138 unhash_delegation(dp);
2139 if (filpp)
2140 *filpp = dp->dl_vfs_file;
2141 }
2142 status = nfs_ok;
2143out:
2144 return status;
2145}
2146
2147
2148/*
2149 * Checks for sequence id mutating operations.
2150 */
2151int
2152nfs4_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)
2153{
2154 int status;
2155 struct nfs4_stateid *stp;
2156 struct nfs4_stateowner *sop;
2157
2158 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2159 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2160 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2161 stateid->si_generation);
2162
2163 *stpp = NULL;
2164 *sopp = NULL;
2165
2166 status = nfserr_bad_stateid;
2167 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2168 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2169 goto out;
2170 }
2171
2172 status = nfserr_stale_stateid;
2173 if (STALE_STATEID(stateid))
2174 goto out;
2175 /*
2176 * We return BAD_STATEID if filehandle doesn't match stateid,
2177 * the confirmed flag is incorrecly set, or the generation
2178 * number is incorrect.
2179 * If there is no entry in the openfile table for this id,
2180 * we can't always return BAD_STATEID;
2181 * this might be a retransmitted CLOSE which has arrived after
2182 * the openfile has been released.
2183 */
2184 if (!(stp = find_stateid(stateid, flags)))
2185 goto no_nfs4_stateid;
2186
2187 status = nfserr_bad_stateid;
2188
2189 /* for new lock stateowners:
2190 * check that the lock->v.new.open_stateid
2191 * refers to an open stateowner
2192 *
2193 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2194 * as the open_stateid->st_stateowner->so_client->clientid
2195 */
2196 if (lockclid) {
2197 struct nfs4_stateowner *sop = stp->st_stateowner;
2198 struct nfs4_client *clp = sop->so_client;
2199
2200 if (!sop->so_is_open_owner)
2201 goto out;
2202 if (!cmp_clid(&clp->cl_clientid, lockclid))
2203 goto out;
2204 }
2205
2206 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2207 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2208 goto out;
2209 }
2210
2211 *stpp = stp;
2212 *sopp = sop = stp->st_stateowner;
2213
2214 /*
2215 * We now validate the seqid and stateid generation numbers.
2216 * For the moment, we ignore the possibility of
2217 * generation number wraparound.
2218 */
2219 if (seqid != sop->so_seqid + 1)
2220 goto check_replay;
2221
2222 if (sop->so_confirmed) {
2223 if (flags & CONFIRM) {
2224 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2225 goto out;
2226 }
2227 }
2228 else {
2229 if (!(flags & CONFIRM)) {
2230 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2231 goto out;
2232 }
2233 }
2234 if (stateid->si_generation > stp->st_stateid.si_generation) {
2235 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2236 goto out;
2237 }
2238
2239 status = nfserr_old_stateid;
2240 if (stateid->si_generation < stp->st_stateid.si_generation) {
2241 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2242 goto out;
2243 }
2244 /* XXX renew the client lease here */
2245 status = nfs_ok;
2246
2247out:
2248 return status;
2249
2250no_nfs4_stateid:
2251
2252 /*
2253 * We determine whether this is a bad stateid or a replay,
2254 * starting by trying to look up the stateowner.
2255 * If stateowner is not found - stateid is bad.
2256 */
2257 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2258 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2259 status = nfserr_bad_stateid;
2260 goto out;
2261 }
2262 *sopp = sop;
2263
2264check_replay:
2265 if (seqid == sop->so_seqid) {
2266 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2267 /* indicate replay to calling function */
2268 status = NFSERR_REPLAY_ME;
2269 } else {
2270 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2271
2272 *sopp = NULL;
2273 status = nfserr_bad_seqid;
2274 }
2275 goto out;
2276}
2277
2278int
2279nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2280{
2281 int status;
2282 struct nfs4_stateowner *sop;
2283 struct nfs4_stateid *stp;
2284
2285 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2286 (int)current_fh->fh_dentry->d_name.len,
2287 current_fh->fh_dentry->d_name.name);
2288
2289 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2290 goto out;
2291
2292 nfs4_lock_state();
2293
2294 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2295 &oc->oc_req_stateid,
2296 CHECK_FH | CONFIRM | OPEN_STATE,
2297 &oc->oc_stateowner, &stp, NULL)))
2298 goto out;
2299
2300 sop = oc->oc_stateowner;
2301 sop->so_confirmed = 1;
2302 update_stateid(&stp->st_stateid);
2303 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2304 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2305 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2306 stp->st_stateid.si_boot,
2307 stp->st_stateid.si_stateownerid,
2308 stp->st_stateid.si_fileid,
2309 stp->st_stateid.si_generation);
2310out:
2311 if (oc->oc_stateowner)
2312 nfs4_get_stateowner(oc->oc_stateowner);
2313 nfs4_unlock_state();
2314 return status;
2315}
2316
2317
2318/*
2319 * unset all bits in union bitmap (bmap) that
2320 * do not exist in share (from successful OPEN_DOWNGRADE)
2321 */
2322static void
2323reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2324{
2325 int i;
2326 for (i = 1; i < 4; i++) {
2327 if ((i & access) != i)
2328 __clear_bit(i, bmap);
2329 }
2330}
2331
2332static void
2333reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2334{
2335 int i;
2336 for (i = 0; i < 4; i++) {
2337 if ((i & deny) != i)
2338 __clear_bit(i, bmap);
2339 }
2340}
2341
2342int
2343nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2344{
2345 int status;
2346 struct nfs4_stateid *stp;
2347 unsigned int share_access;
2348
2349 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2350 (int)current_fh->fh_dentry->d_name.len,
2351 current_fh->fh_dentry->d_name.name);
2352
2353 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2354 return nfserr_inval;
2355
2356 nfs4_lock_state();
2357 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2358 &od->od_stateid,
2359 CHECK_FH | OPEN_STATE,
2360 &od->od_stateowner, &stp, NULL)))
2361 goto out;
2362
2363 status = nfserr_inval;
2364 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2365 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2366 stp->st_access_bmap, od->od_share_access);
2367 goto out;
2368 }
2369 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2370 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2371 stp->st_deny_bmap, od->od_share_deny);
2372 goto out;
2373 }
2374 set_access(&share_access, stp->st_access_bmap);
2375 nfs4_file_downgrade(stp->st_vfs_file,
2376 share_access & ~od->od_share_access);
2377
2378 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2379 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2380
2381 update_stateid(&stp->st_stateid);
2382 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2383 status = nfs_ok;
2384out:
2385 if (od->od_stateowner)
2386 nfs4_get_stateowner(od->od_stateowner);
2387 nfs4_unlock_state();
2388 return status;
2389}
2390
2391/*
2392 * nfs4_unlock_state() called after encode
2393 */
2394int
2395nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2396{
2397 int status;
2398 struct nfs4_stateid *stp;
2399
2400 dprintk("NFSD: nfsd4_close on file %.*s\n",
2401 (int)current_fh->fh_dentry->d_name.len,
2402 current_fh->fh_dentry->d_name.name);
2403
2404 nfs4_lock_state();
2405 /* check close_lru for replay */
2406 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2407 &close->cl_stateid,
2408 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2409 &close->cl_stateowner, &stp, NULL)))
2410 goto out;
2411 /*
2412 * Return success, but first update the stateid.
2413 */
2414 status = nfs_ok;
2415 update_stateid(&stp->st_stateid);
2416 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2417
2418 /* release_state_owner() calls nfsd_close() if needed */
2419 release_state_owner(stp, OPEN_STATE);
2420out:
2421 if (close->cl_stateowner)
2422 nfs4_get_stateowner(close->cl_stateowner);
2423 nfs4_unlock_state();
2424 return status;
2425}
2426
2427int
2428nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2429{
2430 int status;
2431
2432 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2433 goto out;
2434
2435 nfs4_lock_state();
2436 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2437 nfs4_unlock_state();
2438out:
2439 return status;
2440}
2441
2442
2443/*
2444 * Lock owner state (byte-range locks)
2445 */
2446#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2447#define LOCK_HASH_BITS 8
2448#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2449#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2450
2451#define lockownerid_hashval(id) \
2452 ((id) & LOCK_HASH_MASK)
2453
2454static inline unsigned int
2455lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2456 struct xdr_netobj *ownername)
2457{
2458 return (file_hashval(inode) + cl_id
2459 + opaque_hashval(ownername->data, ownername->len))
2460 & LOCK_HASH_MASK;
2461}
2462
2463static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2464static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2465static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2466
2467struct nfs4_stateid *
2468find_stateid(stateid_t *stid, int flags)
2469{
2470 struct nfs4_stateid *local = NULL;
2471 u32 st_id = stid->si_stateownerid;
2472 u32 f_id = stid->si_fileid;
2473 unsigned int hashval;
2474
2475 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2476 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2477 hashval = stateid_hashval(st_id, f_id);
2478 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2479 if ((local->st_stateid.si_stateownerid == st_id) &&
2480 (local->st_stateid.si_fileid == f_id))
2481 return local;
2482 }
2483 }
2484 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2485 hashval = stateid_hashval(st_id, f_id);
2486 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2487 if ((local->st_stateid.si_stateownerid == st_id) &&
2488 (local->st_stateid.si_fileid == f_id))
2489 return local;
2490 }
2491 } else
2492 printk("NFSD: find_stateid: ERROR: no state flag\n");
2493 return NULL;
2494}
2495
2496static struct nfs4_delegation *
2497find_delegation_stateid(struct inode *ino, stateid_t *stid)
2498{
13cd2184
N		 2499 struct nfs4_file *fp;
2500 struct nfs4_delegation *dl;
1da177e4
LT		 2501
2502 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2503 stid->si_boot, stid->si_stateownerid,
2504 stid->si_fileid, stid->si_generation);
2505
1da177e4 2506 fp = find_file(ino);
13cd2184
N		 2507 if (!fp)
2508 return NULL;
2509 dl = find_delegation_file(fp, stid);
2510 put_nfs4_file(fp);
2511 return dl;
1da177e4
LT		 2512}
2513
2514/*
2515 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2516 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2517 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2518 * locking, this prevents us from being completely protocol-compliant. The
2519 * real solution to this problem is to start using unsigned file offsets in
2520 * the VFS, but this is a very deep change!
2521 */
2522static inline void
2523nfs4_transform_lock_offset(struct file_lock *lock)
2524{
2525 if (lock->fl_start < 0)
2526 lock->fl_start = OFFSET_MAX;
2527 if (lock->fl_end < 0)
2528 lock->fl_end = OFFSET_MAX;
2529}
2530
2531int
2532nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2533{
2534 struct nfs4_stateowner *local = NULL;
2535 int status = 0;
2536
2537 if (hashval >= LOCK_HASH_SIZE)
2538 goto out;
2539 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2540 if (local == sop) {
2541 status = 1;
2542 goto out;
2543 }
2544 }
2545out:
2546 return status;
2547}
2548
2549
2550static inline void
2551nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2552{
2553 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2554 unsigned int hval = lockownerid_hashval(sop->so_id);
2555
2556 deny->ld_sop = NULL;
2557 if (nfs4_verify_lock_stateowner(sop, hval)) {
2558 kref_get(&sop->so_ref);
2559 deny->ld_sop = sop;
2560 deny->ld_clientid = sop->so_client->cl_clientid;
2561 }
2562 deny->ld_start = fl->fl_start;
2563 deny->ld_length = ~(u64)0;
2564 if (fl->fl_end != ~(u64)0)
2565 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2566 deny->ld_type = NFS4_READ_LT;
2567 if (fl->fl_type != F_RDLCK)
2568 deny->ld_type = NFS4_WRITE_LT;
2569}
2570
2571static struct nfs4_stateowner *
2572find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2573{
2574 struct nfs4_stateowner *local = NULL;
2575 int i;
2576
2577 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2578 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2579 if (!cmp_owner_str(local, owner, clid))
2580 continue;
2581 return local;
2582 }
2583 }
2584 return NULL;
2585}
2586
2587static struct nfs4_stateowner *
2588find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2589 struct xdr_netobj *owner)
2590{
2591 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2592 struct nfs4_stateowner *op;
2593
2594 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2595 if (cmp_owner_str(op, owner, clid))
2596 return op;
2597 }
2598 return NULL;
2599}
2600
2601/*
2602 * Alloc a lock owner structure.
2603 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2604 * occured.
2605 *
2606 * strhashval = lock_ownerstr_hashval
2607 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2608 */
2609
2610static struct nfs4_stateowner *
2611alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2612 struct nfs4_stateowner *sop;
2613 struct nfs4_replay *rp;
2614 unsigned int idhashval;
2615
2616 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2617 return NULL;
2618 idhashval = lockownerid_hashval(current_ownerid);
2619 INIT_LIST_HEAD(&sop->so_idhash);
2620 INIT_LIST_HEAD(&sop->so_strhash);
2621 INIT_LIST_HEAD(&sop->so_perclient);
2622 INIT_LIST_HEAD(&sop->so_perfilestate);
2623 INIT_LIST_HEAD(&sop->so_perlockowner);
2624 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2625 sop->so_time = 0;
2626 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2627 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2628 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2629 sop->so_is_open_owner = 0;
2630 sop->so_id = current_ownerid++;
2631 sop->so_client = clp;
2632 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2633 sop->so_confirmed = 1;
2634 rp = &sop->so_replay;
2635 rp->rp_status = NFSERR_SERVERFAULT;
2636 rp->rp_buflen = 0;
2637 rp->rp_buf = rp->rp_ibuf;
2638 return sop;
2639}
2640
2641struct nfs4_stateid *
2642alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2643{
2644 struct nfs4_stateid *stp;
2645 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2646
5ac049ac
N		 2647 stp = nfs4_alloc_stateid();
2648 if (stp == NULL)
1da177e4
LT		 2649 goto out;
2650 INIT_LIST_HEAD(&stp->st_hash);
2651 INIT_LIST_HEAD(&stp->st_perfile);
2652 INIT_LIST_HEAD(&stp->st_perfilestate);
2653 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2654 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
8beefa24 2655 list_add(&stp->st_perfile, &fp->fi_stateids);
1da177e4
LT		 2656 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2657 stp->st_stateowner = sop;
13cd2184 2658 get_nfs4_file(fp);
1da177e4
LT		 2659 stp->st_file = fp;
2660 stp->st_stateid.si_boot = boot_time;
2661 stp->st_stateid.si_stateownerid = sop->so_id;
2662 stp->st_stateid.si_fileid = fp->fi_id;
2663 stp->st_stateid.si_generation = 0;
2664 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2665 stp->st_access_bmap = open_stp->st_access_bmap;
2666 stp->st_deny_bmap = open_stp->st_deny_bmap;
2667
2668out:
2669 return stp;
2670}
2671
2672int
2673check_lock_length(u64 offset, u64 length)
2674{
2675 return ((length == 0) || ((length != ~(u64)0) &&
2676 LOFF_OVERFLOW(offset, length)));
2677}
2678
2679/*
2680 * LOCK operation
2681 */
2682int
2683nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2684{
2685 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2686 struct nfs4_stateid *lock_stp;
2687 struct file *filp;
2688 struct file_lock file_lock;
2689 struct file_lock *conflock;
2690 int status = 0;
2691 unsigned int strhashval;
2692
2693 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2694 (long long) lock->lk_offset,
2695 (long long) lock->lk_length);
2696
2697 if (nfs4_in_grace() && !lock->lk_reclaim)
2698 return nfserr_grace;
2699 if (!nfs4_in_grace() && lock->lk_reclaim)
2700 return nfserr_no_grace;
2701
2702 if (check_lock_length(lock->lk_offset, lock->lk_length))
2703 return nfserr_inval;
2704
2705 nfs4_lock_state();
2706
2707 if (lock->lk_is_new) {
2708 /*
2709 * Client indicates that this is a new lockowner.
2710 * Use open owner and open stateid to create lock owner and lock
2711 * stateid.
2712 */
2713 struct nfs4_stateid *open_stp = NULL;
2714 struct nfs4_file *fp;
2715
2716 status = nfserr_stale_clientid;
2717 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2718 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2719 goto out;
2720 }
2721
2722 /* is the new lock seqid presented by the client zero? */
2723 status = nfserr_bad_seqid;
2724 if (lock->v.new.lock_seqid != 0)
2725 goto out;
2726
2727 /* validate and update open stateid and open seqid */
2728 status = nfs4_preprocess_seqid_op(current_fh,
2729 lock->lk_new_open_seqid,
2730 &lock->lk_new_open_stateid,
2731 CHECK_FH | OPEN_STATE,
2732 &open_sop, &open_stp,
2733 &lock->v.new.clientid);
2734 if (status) {
2735 if (lock->lk_reclaim)
2736 status = nfserr_reclaim_bad;
2737 goto out;
2738 }
2739 /* create lockowner and lock stateid */
2740 fp = open_stp->st_file;
2741 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2742 open_sop->so_client->cl_clientid.cl_id,
2743 &lock->v.new.owner);
2744 /*
2745 * If we already have this lock owner, the client is in
2746 * error (or our bookeeping is wrong!)
2747 * for asking for a 'new lock'.
2748 */
2749 status = nfserr_bad_stateid;
2750 lock_sop = find_lockstateowner(&lock->v.new.owner,
2751 &lock->v.new.clientid);
2752 if (lock_sop)
2753 goto out;
2754 status = nfserr_resource;
2755 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2756 goto out;
2757 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2758 fp, open_stp)) == NULL) {
2759 release_stateowner(lock->lk_stateowner);
2760 lock->lk_stateowner = NULL;
2761 goto out;
2762 }
2763 /* bump the open seqid used to create the lock */
2764 open_sop->so_seqid++;
2765 } else {
2766 /* lock (lock owner + lock stateid) already exists */
2767 status = nfs4_preprocess_seqid_op(current_fh,
2768 lock->lk_old_lock_seqid,
2769 &lock->lk_old_lock_stateid,
2770 CHECK_FH | LOCK_STATE,
2771 &lock->lk_stateowner, &lock_stp, NULL);
2772 if (status)
2773 goto out;
2774 }
2775 /* lock->lk_stateowner and lock_stp have been created or found */
2776 filp = lock_stp->st_vfs_file;
2777
2778 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2779 printk("NFSD: nfsd4_lock: permission denied!\n");
2780 goto out;
2781 }
2782
2783 locks_init_lock(&file_lock);
2784 switch (lock->lk_type) {
2785 case NFS4_READ_LT:
2786 case NFS4_READW_LT:
2787 file_lock.fl_type = F_RDLCK;
2788 break;
2789 case NFS4_WRITE_LT:
2790 case NFS4_WRITEW_LT:
2791 file_lock.fl_type = F_WRLCK;
2792 break;
2793 default:
2794 status = nfserr_inval;
2795 goto out;
2796 }
2797 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2798 file_lock.fl_pid = current->tgid;
2799 file_lock.fl_file = filp;
2800 file_lock.fl_flags = FL_POSIX;
2801
2802 file_lock.fl_start = lock->lk_offset;
2803 if ((lock->lk_length == ~(u64)0) ||
2804 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2805 file_lock.fl_end = ~(u64)0;
2806 else
2807 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2808 nfs4_transform_lock_offset(&file_lock);
2809
2810 /*
2811 * Try to lock the file in the VFS.
2812 * Note: locks.c uses the BKL to protect the inode's lock list.
2813 */
2814
2815 status = posix_lock_file(filp, &file_lock);
2816 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2817 file_lock.fl_ops->fl_release_private(&file_lock);
2818 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2819 switch (-status) {
2820 case 0: /* success! */
2821 update_stateid(&lock_stp->st_stateid);
2822 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2823 sizeof(stateid_t));
2824 goto out;
2825 case (EAGAIN):
2826 goto conflicting_lock;
2827 case (EDEADLK):
2828 status = nfserr_deadlock;
2829 default:
2830 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2831 goto out_destroy_new_stateid;
2832 }
2833
2834conflicting_lock:
2835 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2836 status = nfserr_denied;
2837 /* XXX There is a race here. Future patch needed to provide
2838 * an atomic posix_lock_and_test_file
2839 */
2840 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2841 status = nfserr_serverfault;
2842 goto out;
2843 }
2844 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2845
2846out_destroy_new_stateid:
2847 if (lock->lk_is_new) {
2848 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2849 /*
2850 * An error encountered after instantiation of the new
2851 * stateid has forced us to destroy it.
2852 */
2853 if (!seqid_mutating_err(status))
2854 open_sop->so_seqid--;
2855
2856 release_state_owner(lock_stp, LOCK_STATE);
2857 }
2858out:
2859 if (lock->lk_stateowner)
2860 nfs4_get_stateowner(lock->lk_stateowner);
2861 nfs4_unlock_state();
2862 return status;
2863}
2864
2865/*
2866 * LOCKT operation
2867 */
2868int
2869nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2870{
2871 struct inode *inode;
2872 struct file file;
2873 struct file_lock file_lock;
2874 struct file_lock *conflicting_lock;
2875 int status;
2876
2877 if (nfs4_in_grace())
2878 return nfserr_grace;
2879
2880 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2881 return nfserr_inval;
2882
2883 lockt->lt_stateowner = NULL;
2884 nfs4_lock_state();
2885
2886 status = nfserr_stale_clientid;
2887 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2888 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2889 goto out;
2890 }
2891
2892 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2893 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2894 if (status == nfserr_symlink)
2895 status = nfserr_inval;
2896 goto out;
2897 }
2898
2899 inode = current_fh->fh_dentry->d_inode;
2900 locks_init_lock(&file_lock);
2901 switch (lockt->lt_type) {
2902 case NFS4_READ_LT:
2903 case NFS4_READW_LT:
2904 file_lock.fl_type = F_RDLCK;
2905 break;
2906 case NFS4_WRITE_LT:
2907 case NFS4_WRITEW_LT:
2908 file_lock.fl_type = F_WRLCK;
2909 break;
2910 default:
2911 printk("NFSD: nfs4_lockt: bad lock type!\n");
2912 status = nfserr_inval;
2913 goto out;
2914 }
2915
2916 lockt->lt_stateowner = find_lockstateowner_str(inode,
2917 &lockt->lt_clientid, &lockt->lt_owner);
2918 if (lockt->lt_stateowner)
2919 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2920 file_lock.fl_pid = current->tgid;
2921 file_lock.fl_flags = FL_POSIX;
2922
2923 file_lock.fl_start = lockt->lt_offset;
2924 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2925 file_lock.fl_end = ~(u64)0;
2926 else
2927 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2928
2929 nfs4_transform_lock_offset(&file_lock);
2930
2931 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2932 * since LOCKT doesn't require an OPEN, and therefore a struct
2933 * file may not exist, pass posix_test_lock a struct file with
2934 * only the dentry:inode set.
2935 */
2936 memset(&file, 0, sizeof (struct file));
2937 file.f_dentry = current_fh->fh_dentry;
2938
2939 status = nfs_ok;
2940 conflicting_lock = posix_test_lock(&file, &file_lock);
2941 if (conflicting_lock) {
2942 status = nfserr_denied;
2943 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2944 }
2945out:
2946 nfs4_unlock_state();
2947 return status;
2948}
2949
2950int
2951nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2952{
2953 struct nfs4_stateid *stp;
2954 struct file *filp = NULL;
2955 struct file_lock file_lock;
2956 int status;
2957
2958 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2959 (long long) locku->lu_offset,
2960 (long long) locku->lu_length);
2961
2962 if (check_lock_length(locku->lu_offset, locku->lu_length))
2963 return nfserr_inval;
2964
2965 nfs4_lock_state();
2966
2967 if ((status = nfs4_preprocess_seqid_op(current_fh,
2968 locku->lu_seqid,
2969 &locku->lu_stateid,
2970 CHECK_FH | LOCK_STATE,
2971 &locku->lu_stateowner, &stp, NULL)))
2972 goto out;
2973
2974 filp = stp->st_vfs_file;
2975 BUG_ON(!filp);
2976 locks_init_lock(&file_lock);
2977 file_lock.fl_type = F_UNLCK;
2978 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2979 file_lock.fl_pid = current->tgid;
2980 file_lock.fl_file = filp;
2981 file_lock.fl_flags = FL_POSIX;
2982 file_lock.fl_start = locku->lu_offset;
2983
2984 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2985 file_lock.fl_end = ~(u64)0;
2986 else
2987 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2988 nfs4_transform_lock_offset(&file_lock);
2989
2990 /*
2991 * Try to unlock the file in the VFS.
2992 */
2993 status = posix_lock_file(filp, &file_lock);
2994 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2995 file_lock.fl_ops->fl_release_private(&file_lock);
2996 if (status) {
2997 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2998 goto out_nfserr;
2999 }
3000 /*
3001 * OK, unlock succeeded; the only thing left to do is update the stateid.
3002 */
3003 update_stateid(&stp->st_stateid);
3004 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3005
3006out:
3007 if (locku->lu_stateowner)
3008 nfs4_get_stateowner(locku->lu_stateowner);
3009 nfs4_unlock_state();
3010 return status;
3011
3012out_nfserr:
3013 status = nfserrno(status);
3014 goto out;
3015}
3016
3017/*
3018 * returns
3019 * 1: locks held by lockowner
3020 * 0: no locks held by lockowner
3021 */
3022static int
3023check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3024{
3025 struct file_lock **flpp;
3026 struct inode *inode = filp->f_dentry->d_inode;
3027 int status = 0;
3028
3029 lock_kernel();
3030 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3031 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
3032 status = 1;
3033 goto out;
3034 }
3035out:
3036 unlock_kernel();
3037 return status;
3038}
3039
3040int
3041nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
3042{
3043 clientid_t *clid = &rlockowner->rl_clientid;
3044 struct nfs4_stateowner *local = NULL;
3045 struct xdr_netobj *owner = &rlockowner->rl_owner;
3046 int status;
3047
3048 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3049 clid->cl_boot, clid->cl_id);
3050
3051 /* XXX check for lease expiration */
3052
3053 status = nfserr_stale_clientid;
3054 if (STALE_CLIENTID(clid)) {
3055 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
3056 return status;
3057 }
3058
3059 nfs4_lock_state();
3060
3061 status = nfs_ok;
3062 local = find_lockstateowner(owner, clid);
3063 if (local) {
3064 struct nfs4_stateid *stp;
3065
3066 /* check for any locks held by any stateid
3067 * associated with the (lock) stateowner */
3068 status = nfserr_locks_held;
3069 list_for_each_entry(stp, &local->so_perfilestate,
3070 st_perfilestate) {
3071 if (check_for_locks(stp->st_vfs_file, local))
3072 goto out;
3073 }
3074 /* no locks held by (lock) stateowner */
3075 status = nfs_ok;
3076 release_stateowner(local);
3077 }
3078out:
3079 nfs4_unlock_state();
3080 return status;
3081}
3082
3083static inline struct nfs4_client_reclaim *
a55370a3 3084alloc_reclaim(void)
1da177e4 3085{
a55370a3 3086 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
1da177e4
LT		 3087}
3088
3089/*
3090 * failure => all reset bets are off, nfserr_no_grace...
3091 */
3092static int
a55370a3 3093nfs4_client_to_reclaim(char *name)
1da177e4
LT		 3094{
3095 unsigned int strhashval;
3096 struct nfs4_client_reclaim *crp = NULL;
3097
a55370a3
N		 3098 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3099 crp = alloc_reclaim();
1da177e4
LT		 3100 if (!crp)
3101 return 0;
a55370a3 3102 strhashval = clientstr_hashval(name);
1da177e4
LT		 3103 INIT_LIST_HEAD(&crp->cr_strhash);
3104 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
a55370a3 3105 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
1da177e4
LT		 3106 reclaim_str_hashtbl_size++;
3107 return 1;
3108}
3109
3110static void
3111nfs4_release_reclaim(void)
3112{
3113 struct nfs4_client_reclaim *crp = NULL;
3114 int i;
3115
1da177e4
LT		 3116 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3117 while (!list_empty(&reclaim_str_hashtbl[i])) {
3118 crp = list_entry(reclaim_str_hashtbl[i].next,
3119 struct nfs4_client_reclaim, cr_strhash);
3120 list_del(&crp->cr_strhash);
1da177e4
LT		 3121 kfree(crp);
3122 reclaim_str_hashtbl_size--;
3123 }
3124 }
3125 BUG_ON(reclaim_str_hashtbl_size);
3126}
3127
3128/*
3129 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3130struct nfs4_client_reclaim *
3131nfs4_find_reclaim_client(clientid_t *clid)
3132{
3133 unsigned int strhashval;
3134 struct nfs4_client *clp;
3135 struct nfs4_client_reclaim *crp = NULL;
3136
3137
3138 /* find clientid in conf_id_hashtbl */
3139 clp = find_confirmed_client(clid);
3140 if (clp == NULL)
3141 return NULL;
3142
a55370a3
N		 3143 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3144 clp->cl_name.len, clp->cl_name.data,
3145 clp->cl_recdir);
1da177e4
LT		 3146
3147 /* find clp->cl_name in reclaim_str_hashtbl */
a55370a3 3148 strhashval = clientstr_hashval(clp->cl_recdir);
1da177e4 3149 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
a55370a3 3150 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
1da177e4
LT		 3151 return crp;
3152 }
3153 }
3154 return NULL;
3155}
3156
3157/*
3158* Called from OPEN. Look for clientid in reclaim list.
3159*/
3160int
3161nfs4_check_open_reclaim(clientid_t *clid)
3162{
dfc83565 3163 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
1da177e4
LT		 3164}
3165
ac4d8ff2 3166/* initialization to perform at module load time: */
1da177e4 3167
ac4d8ff2
N		 3168void
3169nfs4_state_init(void)
1da177e4
LT		 3170{
3171 int i;
1da177e4 3172
1da177e4
LT		 3173 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3174 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3175 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3176 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3177 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3178 }
3179 for (i = 0; i < FILE_HASH_SIZE; i++) {
3180 INIT_LIST_HEAD(&file_hashtbl[i]);
3181 }
3182 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3183 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3184 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3185 }
3186 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3187 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3188 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3189 }
3190 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3191 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3192 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3193 }
1da177e4 3194 memset(&onestateid, ~0, sizeof(stateid_t));
1da177e4
LT		 3195 INIT_LIST_HEAD(&close_lru);
3196 INIT_LIST_HEAD(&client_lru);
3197 INIT_LIST_HEAD(&del_recall_lru);
ac4d8ff2
N		 3198 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3199 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3200 reclaim_str_hashtbl_size = 0;
ac4d8ff2
N		 3201}
3202
3203/* initialization to perform when the nfsd service is started: */
3204
3205static void
3206__nfs4_state_start(void)
3207{
3208 time_t grace_time;
3209
1da177e4 3210 boot_time = get_seconds();
d99a05ad
N		 3211 grace_time = max(user_lease_time, lease_time);
3212 lease_time = user_lease_time;
3213 printk("NFSD: starting %ld-second grace period\n", grace_time);
1da177e4 3214 grace_end = boot_time + grace_time;
58da282b
N		 3215 laundry_wq = create_singlethread_workqueue("nfsd4");
3216 queue_delayed_work(laundry_wq, &laundromat_work, NFSD_LEASE_TIME*HZ);
1da177e4
LT		 3217}
3218
3219int
76a3550e 3220nfs4_state_start(void)
1da177e4
LT		 3221{
3222 int status;
3223
3224 if (nfs4_init)
3225 return 0;
3226 status = nfsd4_init_slabs();
3227 if (status)
3228 return status;
76a3550e 3229 __nfs4_state_start();
1da177e4
LT		 3230 nfs4_init = 1;
3231 return 0;
3232}
3233
3234int
3235nfs4_in_grace(void)
3236{
3237 return get_seconds() < grace_end;
3238}
3239
3240void
3241set_no_grace(void)
3242{
3243 printk("NFSD: ERROR in reboot recovery. State reclaims will fail.\n");
3244 grace_end = get_seconds();
3245}
3246
3247time_t
3248nfs4_lease_time(void)
3249{
3250 return lease_time;
3251}
3252
3253static void
3254__nfs4_state_shutdown(void)
3255{
3256 int i;
3257 struct nfs4_client *clp = NULL;
3258 struct nfs4_delegation *dp = NULL;
3259 struct nfs4_stateowner *sop = NULL;
3260 struct list_head *pos, *next, reaplist;
3261
3262 list_for_each_safe(pos, next, &close_lru) {
3263 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3264 list_del(&sop->so_close_lru);
3265 nfs4_put_stateowner(sop);
3266 }
3267
3268 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3269 while (!list_empty(&conf_id_hashtbl[i])) {
3270 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3271 expire_client(clp);
3272 }
3273 while (!list_empty(&unconf_str_hashtbl[i])) {
3274 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3275 expire_client(clp);
3276 }
3277 }
3278 INIT_LIST_HEAD(&reaplist);
3279 spin_lock(&recall_lock);
3280 list_for_each_safe(pos, next, &del_recall_lru) {
3281 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3282 list_move(&dp->dl_recall_lru, &reaplist);
3283 }
3284 spin_unlock(&recall_lock);
3285 list_for_each_safe(pos, next, &reaplist) {
3286 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3287 list_del_init(&dp->dl_recall_lru);
3288 unhash_delegation(dp);
3289 }
3290
1da177e4 3291 cancel_delayed_work(&laundromat_work);
58da282b
N		 3292 flush_workqueue(laundry_wq);
3293 destroy_workqueue(laundry_wq);
1da177e4 3294 nfs4_init = 0;
1da177e4
LT		 3295}
3296
3297void
3298nfs4_state_shutdown(void)
3299{
3300 nfs4_lock_state();
3301 nfs4_release_reclaim();
3302 __nfs4_state_shutdown();
3303 nfsd4_free_slabs();
3304 nfs4_unlock_state();
3305}
3306
3307/*
3308 * Called when leasetime is changed.
3309 *
d99a05ad
N		 3310 * The only way the protocol gives us to handle on-the-fly lease changes is to
3311 * simulate a reboot. Instead of doing that, we just wait till the next time
3312 * we start to register any changes in lease time. If the administrator
3313 * really wants to change the lease time *now*, they can go ahead and bring
3314 * nfsd down and then back up again after changing the lease time.
1da177e4
LT		 3315 */
3316void
3317nfs4_reset_lease(time_t leasetime)
3318{
d99a05ad
N		 3319 lock_kernel();
3320 user_lease_time = leasetime;
3321 unlock_kernel();
1da177e4 3322}
Linux 6.x block layer and io_uring tree(s)