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[PATCH] nfsd4: find_delegation_file()
[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 */
56static time_t old_lease_time = 90; /* past incarnation lease time */
57static u32 nfs4_reclaim_init = 0;
58time_t boot_time;
59static time_t grace_end = 0;
60static u32 current_clientid = 1;
61static u32 current_ownerid = 1;
62static u32 current_fileid = 1;
63static u32 current_delegid = 1;
64static u32 nfs4_init;
65stateid_t zerostateid; /* bits all 0 */
66stateid_t onestateid; /* bits all 1 */
67
68/* debug counters */
69u32 list_add_perfile = 0;
70u32 list_del_perfile = 0;
71u32 add_perclient = 0;
72u32 del_perclient = 0;
73u32 alloc_file = 0;
74u32 free_file = 0;
75u32 vfsopen = 0;
76u32 vfsclose = 0;
77u32 alloc_delegation= 0;
78u32 free_delegation= 0;
79
80/* forward declarations */
81struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
82static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
83static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
84
85/* Locking:
86 *
87 * client_sema:
88 * protects clientid_hashtbl[], clientstr_hashtbl[],
89 * unconfstr_hashtbl[], uncofid_hashtbl[].
90 */
91static DECLARE_MUTEX(client_sema);
92
93void
94nfs4_lock_state(void)
95{
96 down(&client_sema);
97}
98
99void
100nfs4_unlock_state(void)
101{
102 up(&client_sema);
103}
104
105static inline u32
106opaque_hashval(const void *ptr, int nbytes)
107{
108 unsigned char *cptr = (unsigned char *) ptr;
109
110 u32 x = 0;
111 while (nbytes--) {
112 x *= 37;
113 x += *cptr++;
114 }
115 return x;
116}
117
118/* forward declarations */
119static void release_stateowner(struct nfs4_stateowner *sop);
120static void release_stateid(struct nfs4_stateid *stp, int flags);
121static void release_file(struct nfs4_file *fp);
122
123/*
124 * Delegation state
125 */
126
127/* recall_lock protects the del_recall_lru */
128spinlock_t recall_lock;
129static struct list_head del_recall_lru;
130
131static struct nfs4_delegation *
132alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
133{
134 struct nfs4_delegation *dp;
135 struct nfs4_file *fp = stp->st_file;
136 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
137
138 dprintk("NFSD alloc_init_deleg\n");
139 if ((dp = kmalloc(sizeof(struct nfs4_delegation),
140 GFP_KERNEL)) == NULL)
141 return dp;
142 INIT_LIST_HEAD(&dp->dl_del_perfile);
143 INIT_LIST_HEAD(&dp->dl_del_perclnt);
144 INIT_LIST_HEAD(&dp->dl_recall_lru);
145 dp->dl_client = clp;
146 dp->dl_file = fp;
147 dp->dl_flock = NULL;
148 get_file(stp->st_vfs_file);
149 dp->dl_vfs_file = stp->st_vfs_file;
150 dp->dl_type = type;
151 dp->dl_recall.cbr_dp = NULL;
152 dp->dl_recall.cbr_ident = cb->cb_ident;
153 dp->dl_recall.cbr_trunc = 0;
154 dp->dl_stateid.si_boot = boot_time;
155 dp->dl_stateid.si_stateownerid = current_delegid++;
156 dp->dl_stateid.si_fileid = 0;
157 dp->dl_stateid.si_generation = 0;
158 dp->dl_fhlen = current_fh->fh_handle.fh_size;
159 memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
160 current_fh->fh_handle.fh_size);
161 dp->dl_time = 0;
162 atomic_set(&dp->dl_count, 1);
163 list_add(&dp->dl_del_perfile, &fp->fi_del_perfile);
164 list_add(&dp->dl_del_perclnt, &clp->cl_del_perclnt);
165 alloc_delegation++;
166 return dp;
167}
168
169void
170nfs4_put_delegation(struct nfs4_delegation *dp)
171{
172 if (atomic_dec_and_test(&dp->dl_count)) {
173 dprintk("NFSD: freeing dp %p\n",dp);
174 kfree(dp);
175 free_delegation++;
176 }
177}
178
179/* Remove the associated file_lock first, then remove the delegation.
180 * lease_modify() is called to remove the FS_LEASE file_lock from
181 * the i_flock list, eventually calling nfsd's lock_manager
182 * fl_release_callback.
183 */
184static void
185nfs4_close_delegation(struct nfs4_delegation *dp)
186{
187 struct file *filp = dp->dl_vfs_file;
188
189 dprintk("NFSD: close_delegation dp %p\n",dp);
190 dp->dl_vfs_file = NULL;
191 /* The following nfsd_close may not actually close the file,
192 * but we want to remove the lease in any case. */
c907132d
N		 193 if (dp->dl_flock)
194 setlease(filp, F_UNLCK, &dp->dl_flock);
1da177e4
LT		 195 nfsd_close(filp);
196 vfsclose++;
197}
198
199/* Called under the state lock. */
200static void
201unhash_delegation(struct nfs4_delegation *dp)
202{
203 list_del_init(&dp->dl_del_perfile);
204 list_del_init(&dp->dl_del_perclnt);
205 spin_lock(&recall_lock);
206 list_del_init(&dp->dl_recall_lru);
207 spin_unlock(&recall_lock);
208 nfs4_close_delegation(dp);
209 nfs4_put_delegation(dp);
210}
211
212/*
213 * SETCLIENTID state
214 */
215
216/* Hash tables for nfs4_clientid state */
217#define CLIENT_HASH_BITS 4
218#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
219#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
220
221#define clientid_hashval(id) \
222 ((id) & CLIENT_HASH_MASK)
223#define clientstr_hashval(name, namelen) \
224 (opaque_hashval((name), (namelen)) & CLIENT_HASH_MASK)
225/*
226 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
227 * used in reboot/reset lease grace period processing
228 *
229 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
230 * setclientid_confirmed info.
231 *
232 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
233 * setclientid info.
234 *
235 * client_lru holds client queue ordered by nfs4_client.cl_time
236 * for lease renewal.
237 *
238 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
239 * for last close replay.
240 */
241static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
242static int reclaim_str_hashtbl_size = 0;
243static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
244static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
245static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
246static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
247static struct list_head client_lru;
248static struct list_head close_lru;
249
250static inline void
251renew_client(struct nfs4_client *clp)
252{
253 /*
254 * Move client to the end to the LRU list.
255 */
256 dprintk("renewing client (clientid %08x/%08x)\n",
257 clp->cl_clientid.cl_boot,
258 clp->cl_clientid.cl_id);
259 list_move_tail(&clp->cl_lru, &client_lru);
260 clp->cl_time = get_seconds();
261}
262
263/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
264static int
265STALE_CLIENTID(clientid_t *clid)
266{
267 if (clid->cl_boot == boot_time)
268 return 0;
269 dprintk("NFSD stale clientid (%08x/%08x)\n",
270 clid->cl_boot, clid->cl_id);
271 return 1;
272}
273
274/*
275 * XXX Should we use a slab cache ?
276 * This type of memory management is somewhat inefficient, but we use it
277 * anyway since SETCLIENTID is not a common operation.
278 */
279static inline struct nfs4_client *
280alloc_client(struct xdr_netobj name)
281{
282 struct nfs4_client *clp;
283
284 if ((clp = kmalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
285 memset(clp, 0, sizeof(*clp));
286 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
287 memcpy(clp->cl_name.data, name.data, name.len);
288 clp->cl_name.len = name.len;
289 }
290 else {
291 kfree(clp);
292 clp = NULL;
293 }
294 }
295 return clp;
296}
297
298static inline void
299free_client(struct nfs4_client *clp)
300{
301 if (clp->cl_cred.cr_group_info)
302 put_group_info(clp->cl_cred.cr_group_info);
303 kfree(clp->cl_name.data);
304 kfree(clp);
305}
306
307void
308put_nfs4_client(struct nfs4_client *clp)
309{
310 if (atomic_dec_and_test(&clp->cl_count))
311 free_client(clp);
312}
313
314static void
315expire_client(struct nfs4_client *clp)
316{
317 struct nfs4_stateowner *sop;
318 struct nfs4_delegation *dp;
319 struct nfs4_callback *cb = &clp->cl_callback;
320 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
321 struct list_head reaplist;
322
323 dprintk("NFSD: expire_client cl_count %d\n",
324 atomic_read(&clp->cl_count));
325
326 /* shutdown rpc client, ending any outstanding recall rpcs */
327 if (atomic_read(&cb->cb_set) == 1 && clnt) {
328 rpc_shutdown_client(clnt);
329 clnt = clp->cl_callback.cb_client = NULL;
330 }
331
332 INIT_LIST_HEAD(&reaplist);
333 spin_lock(&recall_lock);
334 while (!list_empty(&clp->cl_del_perclnt)) {
335 dp = list_entry(clp->cl_del_perclnt.next, struct nfs4_delegation, dl_del_perclnt);
336 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
337 dp->dl_flock);
338 list_del_init(&dp->dl_del_perclnt);
339 list_move(&dp->dl_recall_lru, &reaplist);
340 }
341 spin_unlock(&recall_lock);
342 while (!list_empty(&reaplist)) {
343 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
344 list_del_init(&dp->dl_recall_lru);
345 unhash_delegation(dp);
346 }
347 list_del(&clp->cl_idhash);
348 list_del(&clp->cl_strhash);
349 list_del(&clp->cl_lru);
350 while (!list_empty(&clp->cl_perclient)) {
351 sop = list_entry(clp->cl_perclient.next, struct nfs4_stateowner, so_perclient);
352 release_stateowner(sop);
353 }
354 put_nfs4_client(clp);
355}
356
357static struct nfs4_client *
358create_client(struct xdr_netobj name) {
359 struct nfs4_client *clp;
360
361 if (!(clp = alloc_client(name)))
362 goto out;
363 atomic_set(&clp->cl_count, 1);
364 atomic_set(&clp->cl_callback.cb_set, 0);
365 clp->cl_callback.cb_parsed = 0;
366 INIT_LIST_HEAD(&clp->cl_idhash);
367 INIT_LIST_HEAD(&clp->cl_strhash);
368 INIT_LIST_HEAD(&clp->cl_perclient);
369 INIT_LIST_HEAD(&clp->cl_del_perclnt);
370 INIT_LIST_HEAD(&clp->cl_lru);
371out:
372 return clp;
373}
374
375static void
376copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
377 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
378}
379
380static void
381copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
382 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
383 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
384}
385
386static void
387copy_cred(struct svc_cred *target, struct svc_cred *source) {
388
389 target->cr_uid = source->cr_uid;
390 target->cr_gid = source->cr_gid;
391 target->cr_group_info = source->cr_group_info;
392 get_group_info(target->cr_group_info);
393}
394
395static int
396cmp_name(struct xdr_netobj *n1, struct xdr_netobj *n2) {
397 if (!n1 || !n2)
398 return 0;
399 return((n1->len == n2->len) && !memcmp(n1->data, n2->data, n2->len));
400}
401
402static int
403cmp_verf(nfs4_verifier *v1, nfs4_verifier *v2) {
404 return(!memcmp(v1->data,v2->data,sizeof(v1->data)));
405}
406
407static int
408cmp_clid(clientid_t * cl1, clientid_t * cl2) {
409 return((cl1->cl_boot == cl2->cl_boot) &&
410 (cl1->cl_id == cl2->cl_id));
411}
412
413/* XXX what about NGROUP */
414static int
415cmp_creds(struct svc_cred *cr1, struct svc_cred *cr2){
416 return(cr1->cr_uid == cr2->cr_uid);
417
418}
419
420static void
421gen_clid(struct nfs4_client *clp) {
422 clp->cl_clientid.cl_boot = boot_time;
423 clp->cl_clientid.cl_id = current_clientid++;
424}
425
426static void
427gen_confirm(struct nfs4_client *clp) {
428 struct timespec tv;
429 u32 * p;
430
431 tv = CURRENT_TIME;
432 p = (u32 *)clp->cl_confirm.data;
433 *p++ = tv.tv_sec;
434 *p++ = tv.tv_nsec;
435}
436
437static int
438check_name(struct xdr_netobj name) {
439
440 if (name.len == 0)
441 return 0;
442 if (name.len > NFS4_OPAQUE_LIMIT) {
443 printk("NFSD: check_name: name too long(%d)!\n", name.len);
444 return 0;
445 }
446 return 1;
447}
448
449void
450add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
451{
452 unsigned int idhashval;
453
454 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
455 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
456 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
457 list_add_tail(&clp->cl_lru, &client_lru);
458 clp->cl_time = get_seconds();
459}
460
461void
462move_to_confirmed(struct nfs4_client *clp)
463{
464 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
465 unsigned int strhashval;
466
467 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
468 list_del_init(&clp->cl_strhash);
469 list_del_init(&clp->cl_idhash);
470 list_add(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
471 strhashval = clientstr_hashval(clp->cl_name.data,
472 clp->cl_name.len);
473 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
474 renew_client(clp);
475}
476
477static struct nfs4_client *
478find_confirmed_client(clientid_t *clid)
479{
480 struct nfs4_client *clp;
481 unsigned int idhashval = clientid_hashval(clid->cl_id);
482
483 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
484 if (cmp_clid(&clp->cl_clientid, clid))
485 return clp;
486 }
487 return NULL;
488}
489
490static struct nfs4_client *
491find_unconfirmed_client(clientid_t *clid)
492{
493 struct nfs4_client *clp;
494 unsigned int idhashval = clientid_hashval(clid->cl_id);
495
496 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
497 if (cmp_clid(&clp->cl_clientid, clid))
498 return clp;
499 }
500 return NULL;
501}
502
503/* a helper function for parse_callback */
504static int
505parse_octet(unsigned int *lenp, char **addrp)
506{
507 unsigned int len = *lenp;
508 char *p = *addrp;
509 int n = -1;
510 char c;
511
512 for (;;) {
513 if (!len)
514 break;
515 len--;
516 c = *p++;
517 if (c == '.')
518 break;
519 if ((c < '0') || (c > '9')) {
520 n = -1;
521 break;
522 }
523 if (n < 0)
524 n = 0;
525 n = (n * 10) + (c - '0');
526 if (n > 255) {
527 n = -1;
528 break;
529 }
530 }
531 *lenp = len;
532 *addrp = p;
533 return n;
534}
535
536/* parse and set the setclientid ipv4 callback address */
537int
538parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
539{
540 int temp = 0;
541 u32 cbaddr = 0;
542 u16 cbport = 0;
543 u32 addrlen = addr_len;
544 char *addr = addr_val;
545 int i, shift;
546
547 /* ipaddress */
548 shift = 24;
549 for(i = 4; i > 0 ; i--) {
550 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
551 return 0;
552 }
553 cbaddr |= (temp << shift);
554 if (shift > 0)
555 shift -= 8;
556 }
557 *cbaddrp = cbaddr;
558
559 /* port */
560 shift = 8;
561 for(i = 2; i > 0 ; i--) {
562 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
563 return 0;
564 }
565 cbport |= (temp << shift);
566 if (shift > 0)
567 shift -= 8;
568 }
569 *cbportp = cbport;
570 return 1;
571}
572
573void
574gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
575{
576 struct nfs4_callback *cb = &clp->cl_callback;
577
578 /* Currently, we only support tcp for the callback channel */
579 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
580 goto out_err;
581
582 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
583 &cb->cb_addr, &cb->cb_port)))
584 goto out_err;
585 cb->cb_prog = se->se_callback_prog;
586 cb->cb_ident = se->se_callback_ident;
587 cb->cb_parsed = 1;
588 return;
589out_err:
590 printk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
591 "will not receive delegations\n",
592 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
593
594 cb->cb_parsed = 0;
595 return;
596}
597
598/*
599 * RFC 3010 has a complex implmentation description of processing a
600 * SETCLIENTID request consisting of 5 bullets, labeled as
601 * CASE0 - CASE4 below.
602 *
603 * NOTES:
604 * callback information will be processed in a future patch
605 *
606 * an unconfirmed record is added when:
607 * NORMAL (part of CASE 4): there is no confirmed nor unconfirmed record.
608 * CASE 1: confirmed record found with matching name, principal,
609 * verifier, and clientid.
610 * CASE 2: confirmed record found with matching name, principal,
611 * and there is no unconfirmed record with matching
612 * name and principal
613 *
614 * an unconfirmed record is replaced when:
615 * CASE 3: confirmed record found with matching name, principal,
616 * and an unconfirmed record is found with matching
617 * name, principal, and with clientid and
618 * confirm that does not match the confirmed record.
619 * CASE 4: there is no confirmed record with matching name and
620 * principal. there is an unconfirmed record with
621 * matching name, principal.
622 *
623 * an unconfirmed record is deleted when:
624 * CASE 1: an unconfirmed record that matches input name, verifier,
625 * and confirmed clientid.
626 * CASE 4: any unconfirmed records with matching name and principal
627 * that exist after an unconfirmed record has been replaced
628 * as described above.
629 *
630 */
631int
632nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_setclientid *setclid)
633{
634 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
635 struct xdr_netobj clname = {
636 .len = setclid->se_namelen,
637 .data = setclid->se_name,
638 };
639 nfs4_verifier clverifier = setclid->se_verf;
640 unsigned int strhashval;
641 struct nfs4_client * conf, * unconf, * new, * clp;
642 int status;
643
644 status = nfserr_inval;
645 if (!check_name(clname))
646 goto out;
647
648 /*
649 * XXX The Duplicate Request Cache (DRC) has been checked (??)
650 * We get here on a DRC miss.
651 */
652
653 strhashval = clientstr_hashval(clname.data, clname.len);
654
655 conf = NULL;
656 nfs4_lock_state();
657 list_for_each_entry(clp, &conf_str_hashtbl[strhashval], cl_strhash) {
658 if (!cmp_name(&clp->cl_name, &clname))
659 continue;
660 /*
661 * CASE 0:
662 * clname match, confirmed, different principal
663 * or different ip_address
664 */
665 status = nfserr_clid_inuse;
666 if (!cmp_creds(&clp->cl_cred,&rqstp->rq_cred)) {
667 printk("NFSD: setclientid: string in use by client"
668 "(clientid %08x/%08x)\n",
669 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
670 goto out;
671 }
672 if (clp->cl_addr != ip_addr) {
673 printk("NFSD: setclientid: string in use by client"
674 "(clientid %08x/%08x)\n",
675 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
676 goto out;
677 }
678
679 /*
680 * cl_name match from a previous SETCLIENTID operation
681 * XXX check for additional matches?
682 */
683 conf = clp;
684 break;
685 }
686 unconf = NULL;
687 list_for_each_entry(clp, &unconf_str_hashtbl[strhashval], cl_strhash) {
688 if (!cmp_name(&clp->cl_name, &clname))
689 continue;
690 /* cl_name match from a previous SETCLIENTID operation */
691 unconf = clp;
692 break;
693 }
694 status = nfserr_resource;
695 if (!conf) {
696 /*
697 * CASE 4:
698 * placed first, because it is the normal case.
699 */
700 if (unconf)
701 expire_client(unconf);
702 if (!(new = create_client(clname)))
703 goto out;
704 copy_verf(new, &clverifier);
705 new->cl_addr = ip_addr;
706 copy_cred(&new->cl_cred,&rqstp->rq_cred);
707 gen_clid(new);
708 gen_confirm(new);
709 gen_callback(new, setclid);
710 add_to_unconfirmed(new, strhashval);
711 } else if (cmp_verf(&conf->cl_verifier, &clverifier)) {
712 /*
713 * CASE 1:
714 * cl_name match, confirmed, principal match
715 * verifier match: probable callback update
716 *
717 * remove any unconfirmed nfs4_client with
718 * matching cl_name, cl_verifier, and cl_clientid
719 *
720 * create and insert an unconfirmed nfs4_client with same
721 * cl_name, cl_verifier, and cl_clientid as existing
722 * nfs4_client, but with the new callback info and a
723 * new cl_confirm
724 */
725 if ((unconf) &&
726 cmp_verf(&unconf->cl_verifier, &conf->cl_verifier) &&
727 cmp_clid(&unconf->cl_clientid, &conf->cl_clientid)) {
728 expire_client(unconf);
729 }
730 if (!(new = create_client(clname)))
731 goto out;
732 copy_verf(new,&conf->cl_verifier);
733 new->cl_addr = ip_addr;
734 copy_cred(&new->cl_cred,&rqstp->rq_cred);
735 copy_clid(new, conf);
736 gen_confirm(new);
737 gen_callback(new, setclid);
738 add_to_unconfirmed(new,strhashval);
739 } else if (!unconf) {
740 /*
741 * CASE 2:
742 * clname match, confirmed, principal match
743 * verfier does not match
744 * no unconfirmed. create a new unconfirmed nfs4_client
745 * using input clverifier, clname, and callback info
746 * and generate a new cl_clientid and cl_confirm.
747 */
748 if (!(new = create_client(clname)))
749 goto out;
750 copy_verf(new,&clverifier);
751 new->cl_addr = ip_addr;
752 copy_cred(&new->cl_cred,&rqstp->rq_cred);
753 gen_clid(new);
754 gen_confirm(new);
755 gen_callback(new, setclid);
756 add_to_unconfirmed(new, strhashval);
757 } else if (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm)) {
758 /*
759 * CASE3:
760 * confirmed found (name, principal match)
761 * confirmed verifier does not match input clverifier
762 *
763 * unconfirmed found (name match)
764 * confirmed->cl_confirm != unconfirmed->cl_confirm
765 *
766 * remove unconfirmed.
767 *
768 * create an unconfirmed nfs4_client
769 * with same cl_name as existing confirmed nfs4_client,
770 * but with new callback info, new cl_clientid,
771 * new cl_verifier and a new cl_confirm
772 */
773 expire_client(unconf);
774 if (!(new = create_client(clname)))
775 goto out;
776 copy_verf(new,&clverifier);
777 new->cl_addr = ip_addr;
778 copy_cred(&new->cl_cred,&rqstp->rq_cred);
779 gen_clid(new);
780 gen_confirm(new);
781 gen_callback(new, setclid);
782 add_to_unconfirmed(new, strhashval);
783 } else {
784 /* No cases hit !!! */
785 status = nfserr_inval;
786 goto out;
787
788 }
789 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
790 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
791 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
792 status = nfs_ok;
793out:
794 nfs4_unlock_state();
795 return status;
796}
797
798
799/*
800 * RFC 3010 has a complex implmentation description of processing a
801 * SETCLIENTID_CONFIRM request consisting of 4 bullets describing
802 * processing on a DRC miss, labeled as CASE1 - CASE4 below.
803 *
804 * NOTE: callback information will be processed here in a future patch
805 */
806int
807nfsd4_setclientid_confirm(struct svc_rqst *rqstp, struct nfsd4_setclientid_confirm *setclientid_confirm)
808{
809 u32 ip_addr = rqstp->rq_addr.sin_addr.s_addr;
810 struct nfs4_client *clp, *conf = NULL, *unconf = NULL;
811 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
812 clientid_t * clid = &setclientid_confirm->sc_clientid;
813 int status;
814
815 if (STALE_CLIENTID(clid))
816 return nfserr_stale_clientid;
817 /*
818 * XXX The Duplicate Request Cache (DRC) has been checked (??)
819 * We get here on a DRC miss.
820 */
821
822 nfs4_lock_state();
823 clp = find_confirmed_client(clid);
824 if (clp) {
825 status = nfserr_inval;
826 /*
827 * Found a record for this clientid. If the IP addresses
828 * don't match, return ERR_INVAL just as if the record had
829 * not been found.
830 */
831 if (clp->cl_addr != ip_addr) {
832 printk("NFSD: setclientid: string in use by client"
833 "(clientid %08x/%08x)\n",
834 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
835 goto out;
836 }
837 conf = clp;
838 }
839 clp = find_unconfirmed_client(clid);
840 if (clp) {
841 status = nfserr_inval;
842 if (clp->cl_addr != ip_addr) {
843 printk("NFSD: setclientid: string in use by client"
844 "(clientid %08x/%08x)\n",
845 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
846 goto out;
847 }
848 unconf = clp;
849 }
850 /* CASE 1:
851 * unconf record that matches input clientid and input confirm.
852 * conf record that matches input clientid.
853 * conf and unconf records match names, verifiers
854 */
855 if ((conf && unconf) &&
856 (cmp_verf(&unconf->cl_confirm, &confirm)) &&
857 (cmp_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
858 (cmp_name(&conf->cl_name,&unconf->cl_name)) &&
859 (!cmp_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
860 if (!cmp_creds(&conf->cl_cred, &unconf->cl_cred))
861 status = nfserr_clid_inuse;
862 else {
863 expire_client(conf);
864 clp = unconf;
865 move_to_confirmed(unconf);
866 status = nfs_ok;
867 }
868 goto out;
869 }
870 /* CASE 2:
871 * conf record that matches input clientid.
872 * if unconf record that matches input clientid, then unconf->cl_name
873 * or unconf->cl_verifier don't match the conf record.
874 */
875 if ((conf && !unconf) ||
876 ((conf && unconf) &&
877 (!cmp_verf(&conf->cl_verifier, &unconf->cl_verifier) ||
878 !cmp_name(&conf->cl_name, &unconf->cl_name)))) {
879 if (!cmp_creds(&conf->cl_cred,&rqstp->rq_cred)) {
880 status = nfserr_clid_inuse;
881 } else {
882 clp = conf;
883 status = nfs_ok;
884 }
885 goto out;
886 }
887 /* CASE 3:
888 * conf record not found.
889 * unconf record found.
890 * unconf->cl_confirm matches input confirm
891 */
892 if (!conf && unconf && cmp_verf(&unconf->cl_confirm, &confirm)) {
893 if (!cmp_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
894 status = nfserr_clid_inuse;
895 } else {
896 status = nfs_ok;
897 clp = unconf;
898 move_to_confirmed(unconf);
899 }
900 goto out;
901 }
902 /* CASE 4:
903 * conf record not found, or if conf, then conf->cl_confirm does not
904 * match input confirm.
905 * unconf record not found, or if unconf, then unconf->cl_confirm
906 * does not match input confirm.
907 */
908 if ((!conf || (conf && !cmp_verf(&conf->cl_confirm, &confirm))) &&
909 (!unconf || (unconf && !cmp_verf(&unconf->cl_confirm, &confirm)))) {
910 status = nfserr_stale_clientid;
911 goto out;
912 }
913 /* check that we have hit one of the cases...*/
914 status = nfserr_inval;
915 goto out;
916out:
917 if (!status)
918 nfsd4_probe_callback(clp);
919 nfs4_unlock_state();
920 return status;
921}
922
923/*
924 * Open owner state (share locks)
925 */
926
927/* hash tables for nfs4_stateowner */
928#define OWNER_HASH_BITS 8
929#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
930#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
931
932#define ownerid_hashval(id) \
933 ((id) & OWNER_HASH_MASK)
934#define ownerstr_hashval(clientid, ownername) \
935 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
936
937static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
938static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
939
940/* hash table for nfs4_file */
941#define FILE_HASH_BITS 8
942#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
943#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
944/* hash table for (open)nfs4_stateid */
945#define STATEID_HASH_BITS 10
946#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
947#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
948
949#define file_hashval(x) \
950 hash_ptr(x, FILE_HASH_BITS)
951#define stateid_hashval(owner_id, file_id) \
952 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
953
954static struct list_head file_hashtbl[FILE_HASH_SIZE];
955static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
956
957/* OPEN Share state helper functions */
958static inline struct nfs4_file *
959alloc_init_file(struct inode *ino)
960{
961 struct nfs4_file *fp;
962 unsigned int hashval = file_hashval(ino);
963
964 if ((fp = kmalloc(sizeof(struct nfs4_file),GFP_KERNEL))) {
965 INIT_LIST_HEAD(&fp->fi_hash);
966 INIT_LIST_HEAD(&fp->fi_perfile);
967 INIT_LIST_HEAD(&fp->fi_del_perfile);
968 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
969 fp->fi_inode = igrab(ino);
970 fp->fi_id = current_fileid++;
971 alloc_file++;
972 return fp;
973 }
974 return NULL;
975}
976
977static void
978release_all_files(void)
979{
980 int i;
981 struct nfs4_file *fp;
982
983 for (i=0;i<FILE_HASH_SIZE;i++) {
984 while (!list_empty(&file_hashtbl[i])) {
985 fp = list_entry(file_hashtbl[i].next, struct nfs4_file, fi_hash);
986 /* this should never be more than once... */
987 if (!list_empty(&fp->fi_perfile) || !list_empty(&fp->fi_del_perfile)) {
988 printk("ERROR: release_all_files: file %p is open, creating dangling state !!!\n",fp);
989 }
990 release_file(fp);
991 }
992 }
993}
994
995kmem_cache_t *stateowner_slab = NULL;
996
997static int
998nfsd4_init_slabs(void)
999{
1000 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1001 sizeof(struct nfs4_stateowner), 0, 0, NULL, NULL);
1002 if (stateowner_slab == NULL) {
1003 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1004 return -ENOMEM;
1005 }
1006 return 0;
1007}
1008
1009static void
1010nfsd4_free_slabs(void)
1011{
1012 int status = 0;
1013
1014 if (stateowner_slab)
1015 status = kmem_cache_destroy(stateowner_slab);
1016 stateowner_slab = NULL;
1017 BUG_ON(status);
1018}
1019
1020void
1021nfs4_free_stateowner(struct kref *kref)
1022{
1023 struct nfs4_stateowner *sop =
1024 container_of(kref, struct nfs4_stateowner, so_ref);
1025 kfree(sop->so_owner.data);
1026 kmem_cache_free(stateowner_slab, sop);
1027}
1028
1029static inline struct nfs4_stateowner *
1030alloc_stateowner(struct xdr_netobj *owner)
1031{
1032 struct nfs4_stateowner *sop;
1033
1034 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1035 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1036 memcpy(sop->so_owner.data, owner->data, owner->len);
1037 sop->so_owner.len = owner->len;
1038 kref_init(&sop->so_ref);
1039 return sop;
1040 }
1041 kmem_cache_free(stateowner_slab, sop);
1042 }
1043 return NULL;
1044}
1045
1046static struct nfs4_stateowner *
1047alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1048 struct nfs4_stateowner *sop;
1049 struct nfs4_replay *rp;
1050 unsigned int idhashval;
1051
1052 if (!(sop = alloc_stateowner(&open->op_owner)))
1053 return NULL;
1054 idhashval = ownerid_hashval(current_ownerid);
1055 INIT_LIST_HEAD(&sop->so_idhash);
1056 INIT_LIST_HEAD(&sop->so_strhash);
1057 INIT_LIST_HEAD(&sop->so_perclient);
1058 INIT_LIST_HEAD(&sop->so_perfilestate);
1059 INIT_LIST_HEAD(&sop->so_perlockowner); /* not used */
1060 INIT_LIST_HEAD(&sop->so_close_lru);
1061 sop->so_time = 0;
1062 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1063 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1064 list_add(&sop->so_perclient, &clp->cl_perclient);
1065 add_perclient++;
1066 sop->so_is_open_owner = 1;
1067 sop->so_id = current_ownerid++;
1068 sop->so_client = clp;
1069 sop->so_seqid = open->op_seqid;
1070 sop->so_confirmed = 0;
1071 rp = &sop->so_replay;
1072 rp->rp_status = NFSERR_SERVERFAULT;
1073 rp->rp_buflen = 0;
1074 rp->rp_buf = rp->rp_ibuf;
1075 return sop;
1076}
1077
1078static void
1079release_stateid_lockowners(struct nfs4_stateid *open_stp)
1080{
1081 struct nfs4_stateowner *lock_sop;
1082
1083 while (!list_empty(&open_stp->st_perlockowner)) {
1084 lock_sop = list_entry(open_stp->st_perlockowner.next,
1085 struct nfs4_stateowner, so_perlockowner);
1086 /* list_del(&open_stp->st_perlockowner); */
1087 BUG_ON(lock_sop->so_is_open_owner);
1088 release_stateowner(lock_sop);
1089 }
1090}
1091
1092static void
1093unhash_stateowner(struct nfs4_stateowner *sop)
1094{
1095 struct nfs4_stateid *stp;
1096
1097 list_del(&sop->so_idhash);
1098 list_del(&sop->so_strhash);
1099 if (sop->so_is_open_owner) {
1100 list_del(&sop->so_perclient);
1101 del_perclient++;
1102 }
1103 list_del(&sop->so_perlockowner);
1104 while (!list_empty(&sop->so_perfilestate)) {
1105 stp = list_entry(sop->so_perfilestate.next,
1106 struct nfs4_stateid, st_perfilestate);
1107 if (sop->so_is_open_owner)
1108 release_stateid(stp, OPEN_STATE);
1109 else
1110 release_stateid(stp, LOCK_STATE);
1111 }
1112}
1113
1114static void
1115release_stateowner(struct nfs4_stateowner *sop)
1116{
1117 unhash_stateowner(sop);
1118 list_del(&sop->so_close_lru);
1119 nfs4_put_stateowner(sop);
1120}
1121
1122static inline void
1123init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1124 struct nfs4_stateowner *sop = open->op_stateowner;
1125 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1126
1127 INIT_LIST_HEAD(&stp->st_hash);
1128 INIT_LIST_HEAD(&stp->st_perfilestate);
1129 INIT_LIST_HEAD(&stp->st_perlockowner);
1130 INIT_LIST_HEAD(&stp->st_perfile);
1131 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1132 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
1133 list_add_perfile++;
1134 list_add(&stp->st_perfile, &fp->fi_perfile);
1135 stp->st_stateowner = sop;
1136 stp->st_file = fp;
1137 stp->st_stateid.si_boot = boot_time;
1138 stp->st_stateid.si_stateownerid = sop->so_id;
1139 stp->st_stateid.si_fileid = fp->fi_id;
1140 stp->st_stateid.si_generation = 0;
1141 stp->st_access_bmap = 0;
1142 stp->st_deny_bmap = 0;
1143 __set_bit(open->op_share_access, &stp->st_access_bmap);
1144 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1145}
1146
1147static void
1148release_stateid(struct nfs4_stateid *stp, int flags)
1149{
1150 struct file *filp = stp->st_vfs_file;
1151
1152 list_del(&stp->st_hash);
1153 list_del_perfile++;
1154 list_del(&stp->st_perfile);
1155 list_del(&stp->st_perfilestate);
1156 if (flags & OPEN_STATE) {
1157 release_stateid_lockowners(stp);
1158 stp->st_vfs_file = NULL;
1159 nfsd_close(filp);
1160 vfsclose++;
1161 } else if (flags & LOCK_STATE)
1162 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1163 kfree(stp);
1164 stp = NULL;
1165}
1166
1167static void
1168release_file(struct nfs4_file *fp)
1169{
1170 free_file++;
1171 list_del(&fp->fi_hash);
1172 iput(fp->fi_inode);
1173 kfree(fp);
1174}
1175
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;
1190 struct nfs4_file *fp = stp->st_file;
1191
1192 dprintk("NFSD: release_state_owner\n");
1193 release_stateid(stp, flag);
1194
1195 /* place unused nfs4_stateowners on so_close_lru list to be
1196 * released by the laundromat service after the lease period
1197 * to enable us to handle CLOSE replay
1198 */
1199 if (sop->so_confirmed && list_empty(&sop->so_perfilestate))
1200 move_to_close_lru(sop);
1201 /* unused nfs4_file's are releseed. XXX slab cache? */
1202 if (list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile)) {
1203 release_file(fp);
1204 }
1205}
1206
1207static int
1208cmp_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner, clientid_t *clid) {
1209 return ((sop->so_owner.len == owner->len) &&
1210 !memcmp(sop->so_owner.data, owner->data, owner->len) &&
1211 (sop->so_client->cl_clientid.cl_id == clid->cl_id));
1212}
1213
1214static struct nfs4_stateowner *
1215find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1216{
1217 struct nfs4_stateowner *so = NULL;
1218
1219 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1220 if (cmp_owner_str(so, &open->op_owner, &open->op_clientid))
1221 return so;
1222 }
1223 return NULL;
1224}
1225
1226/* search file_hashtbl[] for file */
1227static struct nfs4_file *
1228find_file(struct inode *ino)
1229{
1230 unsigned int hashval = file_hashval(ino);
1231 struct nfs4_file *fp;
1232
1233 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1234 if (fp->fi_inode == ino)
1235 return fp;
1236 }
1237 return NULL;
1238}
1239
1240#define TEST_ACCESS(x) ((x > 0 || x < 4)?1:0)
1241#define TEST_DENY(x) ((x >= 0 || x < 5)?1:0)
1242
1243void
1244set_access(unsigned int *access, unsigned long bmap) {
1245 int i;
1246
1247 *access = 0;
1248 for (i = 1; i < 4; i++) {
1249 if (test_bit(i, &bmap))
1250 *access |= i;
1251 }
1252}
1253
1254void
1255set_deny(unsigned int *deny, unsigned long bmap) {
1256 int i;
1257
1258 *deny = 0;
1259 for (i = 0; i < 4; i++) {
1260 if (test_bit(i, &bmap))
1261 *deny |= i ;
1262 }
1263}
1264
1265static int
1266test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1267 unsigned int access, deny;
1268
1269 set_access(&access, stp->st_access_bmap);
1270 set_deny(&deny, stp->st_deny_bmap);
1271 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1272 return 0;
1273 return 1;
1274}
1275
1276/*
1277 * Called to check deny when READ with all zero stateid or
1278 * WRITE with all zero or all one stateid
1279 */
1280int
1281nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1282{
1283 struct inode *ino = current_fh->fh_dentry->d_inode;
1284 struct nfs4_file *fp;
1285 struct nfs4_stateid *stp;
1286
1287 dprintk("NFSD: nfs4_share_conflict\n");
1288
1289 fp = find_file(ino);
1290 if (fp) {
1291 /* Search for conflicting share reservations */
1292 list_for_each_entry(stp, &fp->fi_perfile, st_perfile) {
1293 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1294 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1295 return nfserr_share_denied;
1296 }
1297 }
1298 return nfs_ok;
1299}
1300
1301static inline void
1302nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1303{
1304 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1305 put_write_access(filp->f_dentry->d_inode);
1306 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1307 }
1308}
1309
1310/*
1311 * Recall a delegation
1312 */
1313static int
1314do_recall(void *__dp)
1315{
1316 struct nfs4_delegation *dp = __dp;
1317
1318 daemonize("nfsv4-recall");
1319
1320 nfsd4_cb_recall(dp);
1321 return 0;
1322}
1323
1324/*
1325 * Spawn a thread to perform a recall on the delegation represented
1326 * by the lease (file_lock)
1327 *
1328 * Called from break_lease() with lock_kernel() held.
1329 * Note: we assume break_lease will only call this *once* for any given
1330 * lease.
1331 */
1332static
1333void nfsd_break_deleg_cb(struct file_lock *fl)
1334{
1335 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1336 struct task_struct *t;
1337
1338 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1339 if (!dp)
1340 return;
1341
1342 /* We're assuming the state code never drops its reference
1343 * without first removing the lease. Since we're in this lease
1344 * callback (and since the lease code is serialized by the kernel
1345 * lock) we know the server hasn't removed the lease yet, we know
1346 * it's safe to take a reference: */
1347 atomic_inc(&dp->dl_count);
1348
1349 spin_lock(&recall_lock);
1350 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1351 spin_unlock(&recall_lock);
1352
1353 /* only place dl_time is set. protected by lock_kernel*/
1354 dp->dl_time = get_seconds();
1355
1356 /* XXX need to merge NFSD_LEASE_TIME with fs/locks.c:lease_break_time */
1357 fl->fl_break_time = jiffies + NFSD_LEASE_TIME * HZ;
1358
1359 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1360 if (IS_ERR(t)) {
1361 struct nfs4_client *clp = dp->dl_client;
1362
1363 printk(KERN_INFO "NFSD: Callback thread failed for "
1364 "for client (clientid %08x/%08x)\n",
1365 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1366 nfs4_put_delegation(dp);
1367 }
1368}
1369
1370/*
1371 * The file_lock is being reapd.
1372 *
1373 * Called by locks_free_lock() with lock_kernel() held.
1374 */
1375static
1376void nfsd_release_deleg_cb(struct file_lock *fl)
1377{
1378 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1379
1380 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1381
1382 if (!(fl->fl_flags & FL_LEASE) || !dp)
1383 return;
1384 dp->dl_flock = NULL;
1385}
1386
1387/*
1388 * Set the delegation file_lock back pointer.
1389 *
1390 * Called from __setlease() with lock_kernel() held.
1391 */
1392static
1393void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1394{
1395 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1396
1397 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1398 if (!dp)
1399 return;
1400 dp->dl_flock = new;
1401}
1402
1403/*
1404 * Called from __setlease() with lock_kernel() held
1405 */
1406static
1407int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1408{
1409 struct nfs4_delegation *onlistd =
1410 (struct nfs4_delegation *)onlist->fl_owner;
1411 struct nfs4_delegation *tryd =
1412 (struct nfs4_delegation *)try->fl_owner;
1413
1414 if (onlist->fl_lmops != try->fl_lmops)
1415 return 0;
1416
1417 return onlistd->dl_client == tryd->dl_client;
1418}
1419
1420
1421static
1422int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1423{
1424 if (arg & F_UNLCK)
1425 return lease_modify(onlist, arg);
1426 else
1427 return -EAGAIN;
1428}
1429
1430struct lock_manager_operations nfsd_lease_mng_ops = {
1431 .fl_break = nfsd_break_deleg_cb,
1432 .fl_release_private = nfsd_release_deleg_cb,
1433 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1434 .fl_mylease = nfsd_same_client_deleg_cb,
1435 .fl_change = nfsd_change_deleg_cb,
1436};
1437
1438
1439/*
1440 * nfsd4_process_open1()
1441 * lookup stateowner.
1442 * found:
1443 * check confirmed
1444 * confirmed:
1445 * check seqid
1446 * not confirmed:
1447 * delete owner
1448 * create new owner
1449 * notfound:
1450 * verify clientid
1451 * create new owner
1452 *
1453 * called with nfs4_lock_state() held.
1454 */
1455int
1456nfsd4_process_open1(struct nfsd4_open *open)
1457{
1458 int status;
1459 clientid_t *clientid = &open->op_clientid;
1460 struct nfs4_client *clp = NULL;
1461 unsigned int strhashval;
1462 struct nfs4_stateowner *sop = NULL;
1463
1464 status = nfserr_inval;
1465 if (!check_name(open->op_owner))
1466 goto out;
1467
1468 if (STALE_CLIENTID(&open->op_clientid))
1469 return nfserr_stale_clientid;
1470
1471 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1472 sop = find_openstateowner_str(strhashval, open);
1473 if (sop) {
1474 open->op_stateowner = sop;
1475 /* check for replay */
1476 if (open->op_seqid == sop->so_seqid){
1477 if (sop->so_replay.rp_buflen)
1478 return NFSERR_REPLAY_ME;
1479 else {
1480 /* The original OPEN failed so spectacularly
1481 * that we don't even have replay data saved!
1482 * Therefore, we have no choice but to continue
1483 * processing this OPEN; presumably, we'll
1484 * fail again for the same reason.
1485 */
1486 dprintk("nfsd4_process_open1:"
1487 " replay with no replay cache\n");
1488 goto renew;
1489 }
1490 } else if (sop->so_confirmed) {
1491 if (open->op_seqid == sop->so_seqid + 1)
1492 goto renew;
1493 status = nfserr_bad_seqid;
1494 goto out;
1495 } else {
1496 /* If we get here, we received an OPEN for an
1497 * unconfirmed nfs4_stateowner. Since the seqid's are
1498 * different, purge the existing nfs4_stateowner, and
1499 * instantiate a new one.
1500 */
1501 clp = sop->so_client;
1502 release_stateowner(sop);
1503 }
1504 } else {
1505 /* nfs4_stateowner not found.
1506 * Verify clientid and instantiate new nfs4_stateowner.
1507 * If verify fails this is presumably the result of the
1508 * client's lease expiring.
1509 */
1510 status = nfserr_expired;
1511 clp = find_confirmed_client(clientid);
1512 if (clp == NULL)
1513 goto out;
1514 }
1515 status = nfserr_resource;
1516 sop = alloc_init_open_stateowner(strhashval, clp, open);
1517 if (sop == NULL)
1518 goto out;
1519 open->op_stateowner = sop;
1520renew:
1521 status = nfs_ok;
1522 renew_client(sop->so_client);
1523out:
1524 if (status && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1525 status = nfserr_reclaim_bad;
1526 return status;
1527}
1528
52f4fb43
N		 1529static struct nfs4_delegation *
1530find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1531{
1532 struct nfs4_delegation *dp;
1533
1534 list_for_each_entry(dp, &fp->fi_del_perfile, dl_del_perfile) {
1535 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1536 return dp;
1537 }
1538 return NULL;
1539}
1540
1da177e4
LT		 1541static int
1542nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1543{
1544 struct nfs4_stateid *local;
1545 int status = nfserr_share_denied;
1546 struct nfs4_stateowner *sop = open->op_stateowner;
1547
1548 list_for_each_entry(local, &fp->fi_perfile, st_perfile) {
1549 /* ignore lock owners */
1550 if (local->st_stateowner->so_is_open_owner == 0)
1551 continue;
1552 /* remember if we have seen this open owner */
1553 if (local->st_stateowner == sop)
1554 *stpp = local;
1555 /* check for conflicting share reservations */
1556 if (!test_share(local, open))
1557 goto out;
1558 }
1559 status = 0;
1560out:
1561 return status;
1562}
1563
1564static int
1565nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1566 struct svc_fh *cur_fh, int flags)
1567{
1568 struct nfs4_stateid *stp;
1569 int status;
1570
1571 stp = kmalloc(sizeof(struct nfs4_stateid), GFP_KERNEL);
1572 if (stp == NULL)
1573 return nfserr_resource;
1574
1575 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags, &stp->st_vfs_file);
1576 if (status) {
1577 if (status == nfserr_dropit)
1578 status = nfserr_jukebox;
1579 kfree(stp);
1580 return status;
1581 }
1582 vfsopen++;
1583 *stpp = stp;
1584 return 0;
1585}
1586
1587static inline int
1588nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1589 struct nfsd4_open *open)
1590{
1591 struct iattr iattr = {
1592 .ia_valid = ATTR_SIZE,
1593 .ia_size = 0,
1594 };
1595 if (!open->op_truncate)
1596 return 0;
1597 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1598 return -EINVAL;
1599 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1600}
1601
1602static int
1603nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1604{
1605 struct file *filp = stp->st_vfs_file;
1606 struct inode *inode = filp->f_dentry->d_inode;
1607 unsigned int share_access;
1608 int status;
1609
1610 set_access(&share_access, stp->st_access_bmap);
1611 share_access = ~share_access;
1612 share_access &= open->op_share_access;
1613
1614 if (!(share_access & NFS4_SHARE_ACCESS_WRITE))
1615 return nfsd4_truncate(rqstp, cur_fh, open);
1616
1617 status = get_write_access(inode);
1618 if (status)
1619 return nfserrno(status);
1620 status = nfsd4_truncate(rqstp, cur_fh, open);
1621 if (status) {
1622 put_write_access(inode);
1623 return status;
1624 }
1625 /* remember the open */
1626 filp->f_mode = (filp->f_mode | FMODE_WRITE) & ~FMODE_READ;
1627 set_bit(open->op_share_access, &stp->st_access_bmap);
1628 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1629
1630 return nfs_ok;
1631}
1632
1633
1634/* decrement seqid on successful reclaim, it will be bumped in encode_open */
1635static void
1636nfs4_set_claim_prev(struct nfsd4_open *open, int *status)
1637{
1638 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS) {
1639 if (*status)
1640 *status = nfserr_reclaim_bad;
1641 else {
1642 open->op_stateowner->so_confirmed = 1;
1643 open->op_stateowner->so_seqid--;
1644 }
1645 }
1646}
1647
1648/*
1649 * Attempt to hand out a delegation.
1650 */
1651static void
1652nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1653{
1654 struct nfs4_delegation *dp;
1655 struct nfs4_stateowner *sop = stp->st_stateowner;
1656 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1657 struct file_lock fl, *flp = &fl;
1658 int status, flag = 0;
1659
1660 flag = NFS4_OPEN_DELEGATE_NONE;
1661 if (open->op_claim_type != NFS4_OPEN_CLAIM_NULL
1662 || !atomic_read(&cb->cb_set) || !sop->so_confirmed)
1663 goto out;
1664
1665 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1666 flag = NFS4_OPEN_DELEGATE_WRITE;
1667 else
1668 flag = NFS4_OPEN_DELEGATE_READ;
1669
1670 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1671 if (dp == NULL) {
1672 flag = NFS4_OPEN_DELEGATE_NONE;
1673 goto out;
1674 }
1675 locks_init_lock(&fl);
1676 fl.fl_lmops = &nfsd_lease_mng_ops;
1677 fl.fl_flags = FL_LEASE;
1678 fl.fl_end = OFFSET_MAX;
1679 fl.fl_owner = (fl_owner_t)dp;
1680 fl.fl_file = stp->st_vfs_file;
1681 fl.fl_pid = current->tgid;
1682
1683 /* setlease checks to see if delegation should be handed out.
1684 * the lock_manager callbacks fl_mylease and fl_change are used
1685 */
1686 if ((status = setlease(stp->st_vfs_file,
1687 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1688 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
c907132d 1689 unhash_delegation(dp);
1da177e4
LT		 1690 flag = NFS4_OPEN_DELEGATE_NONE;
1691 goto out;
1692 }
1693
1694 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1695
1696 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1697 dp->dl_stateid.si_boot,
1698 dp->dl_stateid.si_stateownerid,
1699 dp->dl_stateid.si_fileid,
1700 dp->dl_stateid.si_generation);
1701out:
1702 open->op_delegate_type = flag;
1703}
1704
1705/*
1706 * called with nfs4_lock_state() held.
1707 */
1708int
1709nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1710{
1711 struct nfs4_file *fp = NULL;
1712 struct inode *ino = current_fh->fh_dentry->d_inode;
1713 struct nfs4_stateid *stp = NULL;
1714 int status;
1715
1716 status = nfserr_inval;
1717 if (!TEST_ACCESS(open->op_share_access) || !TEST_DENY(open->op_share_deny))
1718 goto out;
1719 /*
1720 * Lookup file; if found, lookup stateid and check open request,
1721 * and check for delegations in the process of being recalled.
1722 * If not found, create the nfs4_file struct
1723 */
1724 fp = find_file(ino);
1725 if (fp) {
1726 if ((status = nfs4_check_open(fp, open, &stp)))
1727 goto out;
1728 } else {
1729 status = nfserr_resource;
1730 fp = alloc_init_file(ino);
1731 if (fp == NULL)
1732 goto out;
1733 }
1734
1735 /*
1736 * OPEN the file, or upgrade an existing OPEN.
1737 * If truncate fails, the OPEN fails.
1738 */
1739 if (stp) {
1740 /* Stateid was found, this is an OPEN upgrade */
1741 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1742 if (status)
1743 goto out;
1744 } else {
1745 /* Stateid was not found, this is a new OPEN */
1746 int flags = 0;
1747 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1748 flags = MAY_WRITE;
1749 else
1750 flags = MAY_READ;
1751 if ((status = nfs4_new_open(rqstp, &stp, current_fh, flags)))
1752 goto out;
1753 init_stateid(stp, fp, open);
1754 status = nfsd4_truncate(rqstp, current_fh, open);
1755 if (status) {
1756 release_stateid(stp, OPEN_STATE);
1757 goto out;
1758 }
1759 }
1760 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1761
1762 /*
1763 * Attempt to hand out a delegation. No error return, because the
1764 * OPEN succeeds even if we fail.
1765 */
1766 nfs4_open_delegation(current_fh, open, stp);
1767
1768 status = nfs_ok;
1769
1770 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1771 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1772 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1773out:
1774 /* take the opportunity to clean up unused state */
1775 if (fp && list_empty(&fp->fi_perfile) && list_empty(&fp->fi_del_perfile))
1776 release_file(fp);
1777
1778 /* CLAIM_PREVIOUS has different error returns */
1779 nfs4_set_claim_prev(open, &status);
1780 /*
1781 * To finish the open response, we just need to set the rflags.
1782 */
1783 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1784 if (!open->op_stateowner->so_confirmed)
1785 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1786
1787 return status;
1788}
1789
1790static struct work_struct laundromat_work;
1791static void laundromat_main(void *);
1792static DECLARE_WORK(laundromat_work, laundromat_main, NULL);
1793
1794int
1795nfsd4_renew(clientid_t *clid)
1796{
1797 struct nfs4_client *clp;
1798 int status;
1799
1800 nfs4_lock_state();
1801 dprintk("process_renew(%08x/%08x): starting\n",
1802 clid->cl_boot, clid->cl_id);
1803 status = nfserr_stale_clientid;
1804 if (STALE_CLIENTID(clid))
1805 goto out;
1806 clp = find_confirmed_client(clid);
1807 status = nfserr_expired;
1808 if (clp == NULL) {
1809 /* We assume the client took too long to RENEW. */
1810 dprintk("nfsd4_renew: clientid not found!\n");
1811 goto out;
1812 }
1813 renew_client(clp);
1814 status = nfserr_cb_path_down;
1815 if (!list_empty(&clp->cl_del_perclnt)
1816 && !atomic_read(&clp->cl_callback.cb_set))
1817 goto out;
1818 status = nfs_ok;
1819out:
1820 nfs4_unlock_state();
1821 return status;
1822}
1823
1824time_t
1825nfs4_laundromat(void)
1826{
1827 struct nfs4_client *clp;
1828 struct nfs4_stateowner *sop;
1829 struct nfs4_delegation *dp;
1830 struct list_head *pos, *next, reaplist;
1831 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1832 time_t t, clientid_val = NFSD_LEASE_TIME;
1833 time_t u, test_val = NFSD_LEASE_TIME;
1834
1835 nfs4_lock_state();
1836
1837 dprintk("NFSD: laundromat service - starting\n");
1838 list_for_each_safe(pos, next, &client_lru) {
1839 clp = list_entry(pos, struct nfs4_client, cl_lru);
1840 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1841 t = clp->cl_time - cutoff;
1842 if (clientid_val > t)
1843 clientid_val = t;
1844 break;
1845 }
1846 dprintk("NFSD: purging unused client (clientid %08x)\n",
1847 clp->cl_clientid.cl_id);
1848 expire_client(clp);
1849 }
1850 INIT_LIST_HEAD(&reaplist);
1851 spin_lock(&recall_lock);
1852 list_for_each_safe(pos, next, &del_recall_lru) {
1853 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1854 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1855 u = dp->dl_time - cutoff;
1856 if (test_val > u)
1857 test_val = u;
1858 break;
1859 }
1860 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1861 dp, dp->dl_flock);
1862 list_move(&dp->dl_recall_lru, &reaplist);
1863 }
1864 spin_unlock(&recall_lock);
1865 list_for_each_safe(pos, next, &reaplist) {
1866 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1867 list_del_init(&dp->dl_recall_lru);
1868 unhash_delegation(dp);
1869 }
1870 test_val = NFSD_LEASE_TIME;
1871 list_for_each_safe(pos, next, &close_lru) {
1872 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1873 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1874 u = sop->so_time - cutoff;
1875 if (test_val > u)
1876 test_val = u;
1877 break;
1878 }
1879 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1880 sop->so_id);
1881 list_del(&sop->so_close_lru);
1882 nfs4_put_stateowner(sop);
1883 }
1884 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1885 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1886 nfs4_unlock_state();
1887 return clientid_val;
1888}
1889
1890void
1891laundromat_main(void *not_used)
1892{
1893 time_t t;
1894
1895 t = nfs4_laundromat();
1896 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1897 schedule_delayed_work(&laundromat_work, t*HZ);
1898}
1899
1900/* search ownerid_hashtbl[] and close_lru for stateid owner
1901 * (stateid->si_stateownerid)
1902 */
1903struct nfs4_stateowner *
1904find_openstateowner_id(u32 st_id, int flags) {
1905 struct nfs4_stateowner *local = NULL;
1906
1907 dprintk("NFSD: find_openstateowner_id %d\n", st_id);
1908 if (flags & CLOSE_STATE) {
1909 list_for_each_entry(local, &close_lru, so_close_lru) {
1910 if (local->so_id == st_id)
1911 return local;
1912 }
1913 }
1914 return NULL;
1915}
1916
1917static inline int
1918nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1919{
1920 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_dentry->d_inode;
1921}
1922
1923static int
1924STALE_STATEID(stateid_t *stateid)
1925{
1926 if (stateid->si_boot == boot_time)
1927 return 0;
1928 printk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1929 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1930 stateid->si_generation);
1931 return 1;
1932}
1933
1934static inline int
1935access_permit_read(unsigned long access_bmap)
1936{
1937 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1938 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1939 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1940}
1941
1942static inline int
1943access_permit_write(unsigned long access_bmap)
1944{
1945 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1946 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1947}
1948
1949static
1950int nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1951{
1952 int status = nfserr_openmode;
1953
1954 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1955 goto out;
1956 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1957 goto out;
1958 status = nfs_ok;
1959out:
1960 return status;
1961}
1962
1963static inline int
1964nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1965{
1966 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1967 return nfserr_openmode;
1968 else
1969 return nfs_ok;
1970}
1971
1972static inline int
1973check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1974{
1975 /* Trying to call delegreturn with a special stateid? Yuch: */
1976 if (!(flags & (RD_STATE | WR_STATE)))
1977 return nfserr_bad_stateid;
1978 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1979 return nfs_ok;
1980 else if (nfs4_in_grace()) {
1981 /* Answer in remaining cases depends on existance of
1982 * conflicting state; so we must wait out the grace period. */
1983 return nfserr_grace;
1984 } else if (flags & WR_STATE)
1985 return nfs4_share_conflict(current_fh,
1986 NFS4_SHARE_DENY_WRITE);
1987 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1988 return nfs4_share_conflict(current_fh,
1989 NFS4_SHARE_DENY_READ);
1990}
1991
1992/*
1993 * Allow READ/WRITE during grace period on recovered state only for files
1994 * that are not able to provide mandatory locking.
1995 */
1996static inline int
1997io_during_grace_disallowed(struct inode *inode, int flags)
1998{
1999 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
2000 && MANDATORY_LOCK(inode);
2001}
2002
2003/*
2004* Checks for stateid operations
2005*/
2006int
2007nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2008{
2009 struct nfs4_stateid *stp = NULL;
2010 struct nfs4_delegation *dp = NULL;
2011 stateid_t *stidp;
2012 struct inode *ino = current_fh->fh_dentry->d_inode;
2013 int status;
2014
2015 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2016 stateid->si_boot, stateid->si_stateownerid,
2017 stateid->si_fileid, stateid->si_generation);
2018 if (filpp)
2019 *filpp = NULL;
2020
2021 if (io_during_grace_disallowed(ino, flags))
2022 return nfserr_grace;
2023
2024 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2025 return check_special_stateids(current_fh, stateid, flags);
2026
2027 /* STALE STATEID */
2028 status = nfserr_stale_stateid;
2029 if (STALE_STATEID(stateid))
2030 goto out;
2031
2032 /* BAD STATEID */
2033 status = nfserr_bad_stateid;
2034 if (!stateid->si_fileid) { /* delegation stateid */
2035 if(!(dp = find_delegation_stateid(ino, stateid))) {
2036 dprintk("NFSD: delegation stateid not found\n");
2037 if (nfs4_in_grace())
2038 status = nfserr_grace;
2039 goto out;
2040 }
2041 stidp = &dp->dl_stateid;
2042 } else { /* open or lock stateid */
2043 if (!(stp = find_stateid(stateid, flags))) {
2044 dprintk("NFSD: open or lock stateid not found\n");
2045 if (nfs4_in_grace())
2046 status = nfserr_grace;
2047 goto out;
2048 }
2049 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2050 goto out;
2051 if (!stp->st_stateowner->so_confirmed)
2052 goto out;
2053 stidp = &stp->st_stateid;
2054 }
2055 if (stateid->si_generation > stidp->si_generation)
2056 goto out;
2057
2058 /* OLD STATEID */
2059 status = nfserr_old_stateid;
2060 if (stateid->si_generation < stidp->si_generation)
2061 goto out;
2062 if (stp) {
2063 if ((status = nfs4_check_openmode(stp,flags)))
2064 goto out;
2065 renew_client(stp->st_stateowner->so_client);
2066 if (filpp)
2067 *filpp = stp->st_vfs_file;
2068 } else if (dp) {
2069 if ((status = nfs4_check_delegmode(dp, flags)))
2070 goto out;
2071 renew_client(dp->dl_client);
2072 if (flags & DELEG_RET)
2073 unhash_delegation(dp);
2074 if (filpp)
2075 *filpp = dp->dl_vfs_file;
2076 }
2077 status = nfs_ok;
2078out:
2079 return status;
2080}
2081
2082
2083/*
2084 * Checks for sequence id mutating operations.
2085 */
2086int
2087nfs4_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)
2088{
2089 int status;
2090 struct nfs4_stateid *stp;
2091 struct nfs4_stateowner *sop;
2092
2093 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2094 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2095 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2096 stateid->si_generation);
2097
2098 *stpp = NULL;
2099 *sopp = NULL;
2100
2101 status = nfserr_bad_stateid;
2102 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2103 printk("NFSD: preprocess_seqid_op: magic stateid!\n");
2104 goto out;
2105 }
2106
2107 status = nfserr_stale_stateid;
2108 if (STALE_STATEID(stateid))
2109 goto out;
2110 /*
2111 * We return BAD_STATEID if filehandle doesn't match stateid,
2112 * the confirmed flag is incorrecly set, or the generation
2113 * number is incorrect.
2114 * If there is no entry in the openfile table for this id,
2115 * we can't always return BAD_STATEID;
2116 * this might be a retransmitted CLOSE which has arrived after
2117 * the openfile has been released.
2118 */
2119 if (!(stp = find_stateid(stateid, flags)))
2120 goto no_nfs4_stateid;
2121
2122 status = nfserr_bad_stateid;
2123
2124 /* for new lock stateowners:
2125 * check that the lock->v.new.open_stateid
2126 * refers to an open stateowner
2127 *
2128 * check that the lockclid (nfs4_lock->v.new.clientid) is the same
2129 * as the open_stateid->st_stateowner->so_client->clientid
2130 */
2131 if (lockclid) {
2132 struct nfs4_stateowner *sop = stp->st_stateowner;
2133 struct nfs4_client *clp = sop->so_client;
2134
2135 if (!sop->so_is_open_owner)
2136 goto out;
2137 if (!cmp_clid(&clp->cl_clientid, lockclid))
2138 goto out;
2139 }
2140
2141 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2142 printk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2143 goto out;
2144 }
2145
2146 *stpp = stp;
2147 *sopp = sop = stp->st_stateowner;
2148
2149 /*
2150 * We now validate the seqid and stateid generation numbers.
2151 * For the moment, we ignore the possibility of
2152 * generation number wraparound.
2153 */
2154 if (seqid != sop->so_seqid + 1)
2155 goto check_replay;
2156
2157 if (sop->so_confirmed) {
2158 if (flags & CONFIRM) {
2159 printk("NFSD: preprocess_seqid_op: expected unconfirmed stateowner!\n");
2160 goto out;
2161 }
2162 }
2163 else {
2164 if (!(flags & CONFIRM)) {
2165 printk("NFSD: preprocess_seqid_op: stateowner not confirmed yet!\n");
2166 goto out;
2167 }
2168 }
2169 if (stateid->si_generation > stp->st_stateid.si_generation) {
2170 printk("NFSD: preprocess_seqid_op: future stateid?!\n");
2171 goto out;
2172 }
2173
2174 status = nfserr_old_stateid;
2175 if (stateid->si_generation < stp->st_stateid.si_generation) {
2176 printk("NFSD: preprocess_seqid_op: old stateid!\n");
2177 goto out;
2178 }
2179 /* XXX renew the client lease here */
2180 status = nfs_ok;
2181
2182out:
2183 return status;
2184
2185no_nfs4_stateid:
2186
2187 /*
2188 * We determine whether this is a bad stateid or a replay,
2189 * starting by trying to look up the stateowner.
2190 * If stateowner is not found - stateid is bad.
2191 */
2192 if (!(sop = find_openstateowner_id(stateid->si_stateownerid, flags))) {
2193 printk("NFSD: preprocess_seqid_op: no stateowner or nfs4_stateid!\n");
2194 status = nfserr_bad_stateid;
2195 goto out;
2196 }
2197 *sopp = sop;
2198
2199check_replay:
2200 if (seqid == sop->so_seqid) {
2201 printk("NFSD: preprocess_seqid_op: retransmission?\n");
2202 /* indicate replay to calling function */
2203 status = NFSERR_REPLAY_ME;
2204 } else {
2205 printk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d\n", sop->so_seqid +1, seqid);
2206
2207 *sopp = NULL;
2208 status = nfserr_bad_seqid;
2209 }
2210 goto out;
2211}
2212
2213int
2214nfsd4_open_confirm(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_confirm *oc)
2215{
2216 int status;
2217 struct nfs4_stateowner *sop;
2218 struct nfs4_stateid *stp;
2219
2220 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2221 (int)current_fh->fh_dentry->d_name.len,
2222 current_fh->fh_dentry->d_name.name);
2223
2224 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2225 goto out;
2226
2227 nfs4_lock_state();
2228
2229 if ((status = nfs4_preprocess_seqid_op(current_fh, oc->oc_seqid,
2230 &oc->oc_req_stateid,
2231 CHECK_FH | CONFIRM | OPEN_STATE,
2232 &oc->oc_stateowner, &stp, NULL)))
2233 goto out;
2234
2235 sop = oc->oc_stateowner;
2236 sop->so_confirmed = 1;
2237 update_stateid(&stp->st_stateid);
2238 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2239 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2240 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2241 stp->st_stateid.si_boot,
2242 stp->st_stateid.si_stateownerid,
2243 stp->st_stateid.si_fileid,
2244 stp->st_stateid.si_generation);
2245out:
2246 if (oc->oc_stateowner)
2247 nfs4_get_stateowner(oc->oc_stateowner);
2248 nfs4_unlock_state();
2249 return status;
2250}
2251
2252
2253/*
2254 * unset all bits in union bitmap (bmap) that
2255 * do not exist in share (from successful OPEN_DOWNGRADE)
2256 */
2257static void
2258reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2259{
2260 int i;
2261 for (i = 1; i < 4; i++) {
2262 if ((i & access) != i)
2263 __clear_bit(i, bmap);
2264 }
2265}
2266
2267static void
2268reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2269{
2270 int i;
2271 for (i = 0; i < 4; i++) {
2272 if ((i & deny) != i)
2273 __clear_bit(i, bmap);
2274 }
2275}
2276
2277int
2278nfsd4_open_downgrade(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open_downgrade *od)
2279{
2280 int status;
2281 struct nfs4_stateid *stp;
2282 unsigned int share_access;
2283
2284 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2285 (int)current_fh->fh_dentry->d_name.len,
2286 current_fh->fh_dentry->d_name.name);
2287
2288 if (!TEST_ACCESS(od->od_share_access) || !TEST_DENY(od->od_share_deny))
2289 return nfserr_inval;
2290
2291 nfs4_lock_state();
2292 if ((status = nfs4_preprocess_seqid_op(current_fh, od->od_seqid,
2293 &od->od_stateid,
2294 CHECK_FH | OPEN_STATE,
2295 &od->od_stateowner, &stp, NULL)))
2296 goto out;
2297
2298 status = nfserr_inval;
2299 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2300 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2301 stp->st_access_bmap, od->od_share_access);
2302 goto out;
2303 }
2304 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2305 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2306 stp->st_deny_bmap, od->od_share_deny);
2307 goto out;
2308 }
2309 set_access(&share_access, stp->st_access_bmap);
2310 nfs4_file_downgrade(stp->st_vfs_file,
2311 share_access & ~od->od_share_access);
2312
2313 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2314 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2315
2316 update_stateid(&stp->st_stateid);
2317 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2318 status = nfs_ok;
2319out:
2320 if (od->od_stateowner)
2321 nfs4_get_stateowner(od->od_stateowner);
2322 nfs4_unlock_state();
2323 return status;
2324}
2325
2326/*
2327 * nfs4_unlock_state() called after encode
2328 */
2329int
2330nfsd4_close(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_close *close)
2331{
2332 int status;
2333 struct nfs4_stateid *stp;
2334
2335 dprintk("NFSD: nfsd4_close on file %.*s\n",
2336 (int)current_fh->fh_dentry->d_name.len,
2337 current_fh->fh_dentry->d_name.name);
2338
2339 nfs4_lock_state();
2340 /* check close_lru for replay */
2341 if ((status = nfs4_preprocess_seqid_op(current_fh, close->cl_seqid,
2342 &close->cl_stateid,
2343 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2344 &close->cl_stateowner, &stp, NULL)))
2345 goto out;
2346 /*
2347 * Return success, but first update the stateid.
2348 */
2349 status = nfs_ok;
2350 update_stateid(&stp->st_stateid);
2351 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2352
2353 /* release_state_owner() calls nfsd_close() if needed */
2354 release_state_owner(stp, OPEN_STATE);
2355out:
2356 if (close->cl_stateowner)
2357 nfs4_get_stateowner(close->cl_stateowner);
2358 nfs4_unlock_state();
2359 return status;
2360}
2361
2362int
2363nfsd4_delegreturn(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_delegreturn *dr)
2364{
2365 int status;
2366
2367 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0)))
2368 goto out;
2369
2370 nfs4_lock_state();
2371 status = nfs4_preprocess_stateid_op(current_fh, &dr->dr_stateid, DELEG_RET, NULL);
2372 nfs4_unlock_state();
2373out:
2374 return status;
2375}
2376
2377
2378/*
2379 * Lock owner state (byte-range locks)
2380 */
2381#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2382#define LOCK_HASH_BITS 8
2383#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2384#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2385
2386#define lockownerid_hashval(id) \
2387 ((id) & LOCK_HASH_MASK)
2388
2389static inline unsigned int
2390lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2391 struct xdr_netobj *ownername)
2392{
2393 return (file_hashval(inode) + cl_id
2394 + opaque_hashval(ownername->data, ownername->len))
2395 & LOCK_HASH_MASK;
2396}
2397
2398static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2399static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2400static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2401
2402struct nfs4_stateid *
2403find_stateid(stateid_t *stid, int flags)
2404{
2405 struct nfs4_stateid *local = NULL;
2406 u32 st_id = stid->si_stateownerid;
2407 u32 f_id = stid->si_fileid;
2408 unsigned int hashval;
2409
2410 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2411 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2412 hashval = stateid_hashval(st_id, f_id);
2413 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2414 if ((local->st_stateid.si_stateownerid == st_id) &&
2415 (local->st_stateid.si_fileid == f_id))
2416 return local;
2417 }
2418 }
2419 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2420 hashval = stateid_hashval(st_id, f_id);
2421 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2422 if ((local->st_stateid.si_stateownerid == st_id) &&
2423 (local->st_stateid.si_fileid == f_id))
2424 return local;
2425 }
2426 } else
2427 printk("NFSD: find_stateid: ERROR: no state flag\n");
2428 return NULL;
2429}
2430
2431static struct nfs4_delegation *
2432find_delegation_stateid(struct inode *ino, stateid_t *stid)
2433{
1da177e4 2434 struct nfs4_file *fp = NULL;
1da177e4
LT		 2435
2436 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2437 stid->si_boot, stid->si_stateownerid,
2438 stid->si_fileid, stid->si_generation);
2439
1da177e4 2440 fp = find_file(ino);
52f4fb43
N		 2441 if (fp)
2442 return find_delegation_file(fp, stid);
1da177e4
LT		 2443 return NULL;
2444}
2445
2446/*
2447 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2448 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2449 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2450 * locking, this prevents us from being completely protocol-compliant. The
2451 * real solution to this problem is to start using unsigned file offsets in
2452 * the VFS, but this is a very deep change!
2453 */
2454static inline void
2455nfs4_transform_lock_offset(struct file_lock *lock)
2456{
2457 if (lock->fl_start < 0)
2458 lock->fl_start = OFFSET_MAX;
2459 if (lock->fl_end < 0)
2460 lock->fl_end = OFFSET_MAX;
2461}
2462
2463int
2464nfs4_verify_lock_stateowner(struct nfs4_stateowner *sop, unsigned int hashval)
2465{
2466 struct nfs4_stateowner *local = NULL;
2467 int status = 0;
2468
2469 if (hashval >= LOCK_HASH_SIZE)
2470 goto out;
2471 list_for_each_entry(local, &lock_ownerid_hashtbl[hashval], so_idhash) {
2472 if (local == sop) {
2473 status = 1;
2474 goto out;
2475 }
2476 }
2477out:
2478 return status;
2479}
2480
2481
2482static inline void
2483nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2484{
2485 struct nfs4_stateowner *sop = (struct nfs4_stateowner *) fl->fl_owner;
2486 unsigned int hval = lockownerid_hashval(sop->so_id);
2487
2488 deny->ld_sop = NULL;
2489 if (nfs4_verify_lock_stateowner(sop, hval)) {
2490 kref_get(&sop->so_ref);
2491 deny->ld_sop = sop;
2492 deny->ld_clientid = sop->so_client->cl_clientid;
2493 }
2494 deny->ld_start = fl->fl_start;
2495 deny->ld_length = ~(u64)0;
2496 if (fl->fl_end != ~(u64)0)
2497 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2498 deny->ld_type = NFS4_READ_LT;
2499 if (fl->fl_type != F_RDLCK)
2500 deny->ld_type = NFS4_WRITE_LT;
2501}
2502
2503static struct nfs4_stateowner *
2504find_lockstateowner(struct xdr_netobj *owner, clientid_t *clid)
2505{
2506 struct nfs4_stateowner *local = NULL;
2507 int i;
2508
2509 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2510 list_for_each_entry(local, &lock_ownerid_hashtbl[i], so_idhash) {
2511 if (!cmp_owner_str(local, owner, clid))
2512 continue;
2513 return local;
2514 }
2515 }
2516 return NULL;
2517}
2518
2519static struct nfs4_stateowner *
2520find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2521 struct xdr_netobj *owner)
2522{
2523 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2524 struct nfs4_stateowner *op;
2525
2526 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2527 if (cmp_owner_str(op, owner, clid))
2528 return op;
2529 }
2530 return NULL;
2531}
2532
2533/*
2534 * Alloc a lock owner structure.
2535 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2536 * occured.
2537 *
2538 * strhashval = lock_ownerstr_hashval
2539 * so_seqid = lock->lk_new_lock_seqid - 1: it gets bumped in encode
2540 */
2541
2542static struct nfs4_stateowner *
2543alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2544 struct nfs4_stateowner *sop;
2545 struct nfs4_replay *rp;
2546 unsigned int idhashval;
2547
2548 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2549 return NULL;
2550 idhashval = lockownerid_hashval(current_ownerid);
2551 INIT_LIST_HEAD(&sop->so_idhash);
2552 INIT_LIST_HEAD(&sop->so_strhash);
2553 INIT_LIST_HEAD(&sop->so_perclient);
2554 INIT_LIST_HEAD(&sop->so_perfilestate);
2555 INIT_LIST_HEAD(&sop->so_perlockowner);
2556 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2557 sop->so_time = 0;
2558 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2559 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2560 list_add(&sop->so_perlockowner, &open_stp->st_perlockowner);
2561 sop->so_is_open_owner = 0;
2562 sop->so_id = current_ownerid++;
2563 sop->so_client = clp;
2564 sop->so_seqid = lock->lk_new_lock_seqid - 1;
2565 sop->so_confirmed = 1;
2566 rp = &sop->so_replay;
2567 rp->rp_status = NFSERR_SERVERFAULT;
2568 rp->rp_buflen = 0;
2569 rp->rp_buf = rp->rp_ibuf;
2570 return sop;
2571}
2572
2573struct nfs4_stateid *
2574alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2575{
2576 struct nfs4_stateid *stp;
2577 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2578
2579 if ((stp = kmalloc(sizeof(struct nfs4_stateid),
2580 GFP_KERNEL)) == NULL)
2581 goto out;
2582 INIT_LIST_HEAD(&stp->st_hash);
2583 INIT_LIST_HEAD(&stp->st_perfile);
2584 INIT_LIST_HEAD(&stp->st_perfilestate);
2585 INIT_LIST_HEAD(&stp->st_perlockowner); /* not used */
2586 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2587 list_add(&stp->st_perfile, &fp->fi_perfile);
2588 list_add_perfile++;
2589 list_add(&stp->st_perfilestate, &sop->so_perfilestate);
2590 stp->st_stateowner = sop;
2591 stp->st_file = fp;
2592 stp->st_stateid.si_boot = boot_time;
2593 stp->st_stateid.si_stateownerid = sop->so_id;
2594 stp->st_stateid.si_fileid = fp->fi_id;
2595 stp->st_stateid.si_generation = 0;
2596 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2597 stp->st_access_bmap = open_stp->st_access_bmap;
2598 stp->st_deny_bmap = open_stp->st_deny_bmap;
2599
2600out:
2601 return stp;
2602}
2603
2604int
2605check_lock_length(u64 offset, u64 length)
2606{
2607 return ((length == 0) || ((length != ~(u64)0) &&
2608 LOFF_OVERFLOW(offset, length)));
2609}
2610
2611/*
2612 * LOCK operation
2613 */
2614int
2615nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock)
2616{
2617 struct nfs4_stateowner *lock_sop = NULL, *open_sop = NULL;
2618 struct nfs4_stateid *lock_stp;
2619 struct file *filp;
2620 struct file_lock file_lock;
2621 struct file_lock *conflock;
2622 int status = 0;
2623 unsigned int strhashval;
2624
2625 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2626 (long long) lock->lk_offset,
2627 (long long) lock->lk_length);
2628
2629 if (nfs4_in_grace() && !lock->lk_reclaim)
2630 return nfserr_grace;
2631 if (!nfs4_in_grace() && lock->lk_reclaim)
2632 return nfserr_no_grace;
2633
2634 if (check_lock_length(lock->lk_offset, lock->lk_length))
2635 return nfserr_inval;
2636
2637 nfs4_lock_state();
2638
2639 if (lock->lk_is_new) {
2640 /*
2641 * Client indicates that this is a new lockowner.
2642 * Use open owner and open stateid to create lock owner and lock
2643 * stateid.
2644 */
2645 struct nfs4_stateid *open_stp = NULL;
2646 struct nfs4_file *fp;
2647
2648 status = nfserr_stale_clientid;
2649 if (STALE_CLIENTID(&lock->lk_new_clientid)) {
2650 printk("NFSD: nfsd4_lock: clientid is stale!\n");
2651 goto out;
2652 }
2653
2654 /* is the new lock seqid presented by the client zero? */
2655 status = nfserr_bad_seqid;
2656 if (lock->v.new.lock_seqid != 0)
2657 goto out;
2658
2659 /* validate and update open stateid and open seqid */
2660 status = nfs4_preprocess_seqid_op(current_fh,
2661 lock->lk_new_open_seqid,
2662 &lock->lk_new_open_stateid,
2663 CHECK_FH | OPEN_STATE,
2664 &open_sop, &open_stp,
2665 &lock->v.new.clientid);
2666 if (status) {
2667 if (lock->lk_reclaim)
2668 status = nfserr_reclaim_bad;
2669 goto out;
2670 }
2671 /* create lockowner and lock stateid */
2672 fp = open_stp->st_file;
2673 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2674 open_sop->so_client->cl_clientid.cl_id,
2675 &lock->v.new.owner);
2676 /*
2677 * If we already have this lock owner, the client is in
2678 * error (or our bookeeping is wrong!)
2679 * for asking for a 'new lock'.
2680 */
2681 status = nfserr_bad_stateid;
2682 lock_sop = find_lockstateowner(&lock->v.new.owner,
2683 &lock->v.new.clientid);
2684 if (lock_sop)
2685 goto out;
2686 status = nfserr_resource;
2687 if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
2688 goto out;
2689 if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner,
2690 fp, open_stp)) == NULL) {
2691 release_stateowner(lock->lk_stateowner);
2692 lock->lk_stateowner = NULL;
2693 goto out;
2694 }
2695 /* bump the open seqid used to create the lock */
2696 open_sop->so_seqid++;
2697 } else {
2698 /* lock (lock owner + lock stateid) already exists */
2699 status = nfs4_preprocess_seqid_op(current_fh,
2700 lock->lk_old_lock_seqid,
2701 &lock->lk_old_lock_stateid,
2702 CHECK_FH | LOCK_STATE,
2703 &lock->lk_stateowner, &lock_stp, NULL);
2704 if (status)
2705 goto out;
2706 }
2707 /* lock->lk_stateowner and lock_stp have been created or found */
2708 filp = lock_stp->st_vfs_file;
2709
2710 if ((status = fh_verify(rqstp, current_fh, S_IFREG, MAY_LOCK))) {
2711 printk("NFSD: nfsd4_lock: permission denied!\n");
2712 goto out;
2713 }
2714
2715 locks_init_lock(&file_lock);
2716 switch (lock->lk_type) {
2717 case NFS4_READ_LT:
2718 case NFS4_READW_LT:
2719 file_lock.fl_type = F_RDLCK;
2720 break;
2721 case NFS4_WRITE_LT:
2722 case NFS4_WRITEW_LT:
2723 file_lock.fl_type = F_WRLCK;
2724 break;
2725 default:
2726 status = nfserr_inval;
2727 goto out;
2728 }
2729 file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
2730 file_lock.fl_pid = current->tgid;
2731 file_lock.fl_file = filp;
2732 file_lock.fl_flags = FL_POSIX;
2733
2734 file_lock.fl_start = lock->lk_offset;
2735 if ((lock->lk_length == ~(u64)0) ||
2736 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2737 file_lock.fl_end = ~(u64)0;
2738 else
2739 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2740 nfs4_transform_lock_offset(&file_lock);
2741
2742 /*
2743 * Try to lock the file in the VFS.
2744 * Note: locks.c uses the BKL to protect the inode's lock list.
2745 */
2746
2747 status = posix_lock_file(filp, &file_lock);
2748 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2749 file_lock.fl_ops->fl_release_private(&file_lock);
2750 dprintk("NFSD: nfsd4_lock: posix_lock_file status %d\n",status);
2751 switch (-status) {
2752 case 0: /* success! */
2753 update_stateid(&lock_stp->st_stateid);
2754 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2755 sizeof(stateid_t));
2756 goto out;
2757 case (EAGAIN):
2758 goto conflicting_lock;
2759 case (EDEADLK):
2760 status = nfserr_deadlock;
2761 default:
2762 dprintk("NFSD: nfsd4_lock: posix_lock_file() failed! status %d\n",status);
2763 goto out_destroy_new_stateid;
2764 }
2765
2766conflicting_lock:
2767 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2768 status = nfserr_denied;
2769 /* XXX There is a race here. Future patch needed to provide
2770 * an atomic posix_lock_and_test_file
2771 */
2772 if (!(conflock = posix_test_lock(filp, &file_lock))) {
2773 status = nfserr_serverfault;
2774 goto out;
2775 }
2776 nfs4_set_lock_denied(conflock, &lock->lk_denied);
2777
2778out_destroy_new_stateid:
2779 if (lock->lk_is_new) {
2780 dprintk("NFSD: nfsd4_lock: destroy new stateid!\n");
2781 /*
2782 * An error encountered after instantiation of the new
2783 * stateid has forced us to destroy it.
2784 */
2785 if (!seqid_mutating_err(status))
2786 open_sop->so_seqid--;
2787
2788 release_state_owner(lock_stp, LOCK_STATE);
2789 }
2790out:
2791 if (lock->lk_stateowner)
2792 nfs4_get_stateowner(lock->lk_stateowner);
2793 nfs4_unlock_state();
2794 return status;
2795}
2796
2797/*
2798 * LOCKT operation
2799 */
2800int
2801nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lockt *lockt)
2802{
2803 struct inode *inode;
2804 struct file file;
2805 struct file_lock file_lock;
2806 struct file_lock *conflicting_lock;
2807 int status;
2808
2809 if (nfs4_in_grace())
2810 return nfserr_grace;
2811
2812 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2813 return nfserr_inval;
2814
2815 lockt->lt_stateowner = NULL;
2816 nfs4_lock_state();
2817
2818 status = nfserr_stale_clientid;
2819 if (STALE_CLIENTID(&lockt->lt_clientid)) {
2820 printk("NFSD: nfsd4_lockt: clientid is stale!\n");
2821 goto out;
2822 }
2823
2824 if ((status = fh_verify(rqstp, current_fh, S_IFREG, 0))) {
2825 printk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2826 if (status == nfserr_symlink)
2827 status = nfserr_inval;
2828 goto out;
2829 }
2830
2831 inode = current_fh->fh_dentry->d_inode;
2832 locks_init_lock(&file_lock);
2833 switch (lockt->lt_type) {
2834 case NFS4_READ_LT:
2835 case NFS4_READW_LT:
2836 file_lock.fl_type = F_RDLCK;
2837 break;
2838 case NFS4_WRITE_LT:
2839 case NFS4_WRITEW_LT:
2840 file_lock.fl_type = F_WRLCK;
2841 break;
2842 default:
2843 printk("NFSD: nfs4_lockt: bad lock type!\n");
2844 status = nfserr_inval;
2845 goto out;
2846 }
2847
2848 lockt->lt_stateowner = find_lockstateowner_str(inode,
2849 &lockt->lt_clientid, &lockt->lt_owner);
2850 if (lockt->lt_stateowner)
2851 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2852 file_lock.fl_pid = current->tgid;
2853 file_lock.fl_flags = FL_POSIX;
2854
2855 file_lock.fl_start = lockt->lt_offset;
2856 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2857 file_lock.fl_end = ~(u64)0;
2858 else
2859 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2860
2861 nfs4_transform_lock_offset(&file_lock);
2862
2863 /* posix_test_lock uses the struct file _only_ to resolve the inode.
2864 * since LOCKT doesn't require an OPEN, and therefore a struct
2865 * file may not exist, pass posix_test_lock a struct file with
2866 * only the dentry:inode set.
2867 */
2868 memset(&file, 0, sizeof (struct file));
2869 file.f_dentry = current_fh->fh_dentry;
2870
2871 status = nfs_ok;
2872 conflicting_lock = posix_test_lock(&file, &file_lock);
2873 if (conflicting_lock) {
2874 status = nfserr_denied;
2875 nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
2876 }
2877out:
2878 nfs4_unlock_state();
2879 return status;
2880}
2881
2882int
2883nfsd4_locku(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_locku *locku)
2884{
2885 struct nfs4_stateid *stp;
2886 struct file *filp = NULL;
2887 struct file_lock file_lock;
2888 int status;
2889
2890 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2891 (long long) locku->lu_offset,
2892 (long long) locku->lu_length);
2893
2894 if (check_lock_length(locku->lu_offset, locku->lu_length))
2895 return nfserr_inval;
2896
2897 nfs4_lock_state();
2898
2899 if ((status = nfs4_preprocess_seqid_op(current_fh,
2900 locku->lu_seqid,
2901 &locku->lu_stateid,
2902 CHECK_FH | LOCK_STATE,
2903 &locku->lu_stateowner, &stp, NULL)))
2904 goto out;
2905
2906 filp = stp->st_vfs_file;
2907 BUG_ON(!filp);
2908 locks_init_lock(&file_lock);
2909 file_lock.fl_type = F_UNLCK;
2910 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2911 file_lock.fl_pid = current->tgid;
2912 file_lock.fl_file = filp;
2913 file_lock.fl_flags = FL_POSIX;
2914 file_lock.fl_start = locku->lu_offset;
2915
2916 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2917 file_lock.fl_end = ~(u64)0;
2918 else
2919 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2920 nfs4_transform_lock_offset(&file_lock);
2921
2922 /*
2923 * Try to unlock the file in the VFS.
2924 */
2925 status = posix_lock_file(filp, &file_lock);
2926 if (file_lock.fl_ops && file_lock.fl_ops->fl_release_private)
2927 file_lock.fl_ops->fl_release_private(&file_lock);
2928 if (status) {
2929 printk("NFSD: nfs4_locku: posix_lock_file failed!\n");
2930 goto out_nfserr;
2931 }
2932 /*
2933 * OK, unlock succeeded; the only thing left to do is update the stateid.
2934 */
2935 update_stateid(&stp->st_stateid);
2936 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2937
2938out:
2939 if (locku->lu_stateowner)
2940 nfs4_get_stateowner(locku->lu_stateowner);
2941 nfs4_unlock_state();
2942 return status;
2943
2944out_nfserr:
2945 status = nfserrno(status);
2946 goto out;
2947}
2948
2949/*
2950 * returns
2951 * 1: locks held by lockowner
2952 * 0: no locks held by lockowner
2953 */
2954static int
2955check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2956{
2957 struct file_lock **flpp;
2958 struct inode *inode = filp->f_dentry->d_inode;
2959 int status = 0;
2960
2961 lock_kernel();
2962 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2963 if ((*flpp)->fl_owner == (fl_owner_t)lowner)
2964 status = 1;
2965 goto out;
2966 }
2967out:
2968 unlock_kernel();
2969 return status;
2970}
2971
2972int
2973nfsd4_release_lockowner(struct svc_rqst *rqstp, struct nfsd4_release_lockowner *rlockowner)
2974{
2975 clientid_t *clid = &rlockowner->rl_clientid;
2976 struct nfs4_stateowner *local = NULL;
2977 struct xdr_netobj *owner = &rlockowner->rl_owner;
2978 int status;
2979
2980 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2981 clid->cl_boot, clid->cl_id);
2982
2983 /* XXX check for lease expiration */
2984
2985 status = nfserr_stale_clientid;
2986 if (STALE_CLIENTID(clid)) {
2987 printk("NFSD: nfsd4_release_lockowner: clientid is stale!\n");
2988 return status;
2989 }
2990
2991 nfs4_lock_state();
2992
2993 status = nfs_ok;
2994 local = find_lockstateowner(owner, clid);
2995 if (local) {
2996 struct nfs4_stateid *stp;
2997
2998 /* check for any locks held by any stateid
2999 * associated with the (lock) stateowner */
3000 status = nfserr_locks_held;
3001 list_for_each_entry(stp, &local->so_perfilestate,
3002 st_perfilestate) {
3003 if (check_for_locks(stp->st_vfs_file, local))
3004 goto out;
3005 }
3006 /* no locks held by (lock) stateowner */
3007 status = nfs_ok;
3008 release_stateowner(local);
3009 }
3010out:
3011 nfs4_unlock_state();
3012 return status;
3013}
3014
3015static inline struct nfs4_client_reclaim *
3016alloc_reclaim(int namelen)
3017{
3018 struct nfs4_client_reclaim *crp = NULL;
3019
3020 crp = kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3021 if (!crp)
3022 return NULL;
3023 crp->cr_name.data = kmalloc(namelen, GFP_KERNEL);
3024 if (!crp->cr_name.data) {
3025 kfree(crp);
3026 return NULL;
3027 }
3028 return crp;
3029}
3030
3031/*
3032 * failure => all reset bets are off, nfserr_no_grace...
3033 */
3034static int
3035nfs4_client_to_reclaim(char *name, int namlen)
3036{
3037 unsigned int strhashval;
3038 struct nfs4_client_reclaim *crp = NULL;
3039
3040 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", namlen, name);
3041 crp = alloc_reclaim(namlen);
3042 if (!crp)
3043 return 0;
3044 strhashval = clientstr_hashval(name, namlen);
3045 INIT_LIST_HEAD(&crp->cr_strhash);
3046 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3047 memcpy(crp->cr_name.data, name, namlen);
3048 crp->cr_name.len = namlen;
3049 reclaim_str_hashtbl_size++;
3050 return 1;
3051}
3052
3053static void
3054nfs4_release_reclaim(void)
3055{
3056 struct nfs4_client_reclaim *crp = NULL;
3057 int i;
3058
3059 BUG_ON(!nfs4_reclaim_init);
3060 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3061 while (!list_empty(&reclaim_str_hashtbl[i])) {
3062 crp = list_entry(reclaim_str_hashtbl[i].next,
3063 struct nfs4_client_reclaim, cr_strhash);
3064 list_del(&crp->cr_strhash);
3065 kfree(crp->cr_name.data);
3066 kfree(crp);
3067 reclaim_str_hashtbl_size--;
3068 }
3069 }
3070 BUG_ON(reclaim_str_hashtbl_size);
3071}
3072
3073/*
3074 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3075struct nfs4_client_reclaim *
3076nfs4_find_reclaim_client(clientid_t *clid)
3077{
3078 unsigned int strhashval;
3079 struct nfs4_client *clp;
3080 struct nfs4_client_reclaim *crp = NULL;
3081
3082
3083 /* find clientid in conf_id_hashtbl */
3084 clp = find_confirmed_client(clid);
3085 if (clp == NULL)
3086 return NULL;
3087
3088 dprintk("NFSD: nfs4_find_reclaim_client for %.*s\n",
3089 clp->cl_name.len, clp->cl_name.data);
3090
3091 /* find clp->cl_name in reclaim_str_hashtbl */
3092 strhashval = clientstr_hashval(clp->cl_name.data, clp->cl_name.len);
3093 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3094 if (cmp_name(&crp->cr_name, &clp->cl_name)) {
3095 return crp;
3096 }
3097 }
3098 return NULL;
3099}
3100
3101/*
3102* Called from OPEN. Look for clientid in reclaim list.
3103*/
3104int
3105nfs4_check_open_reclaim(clientid_t *clid)
3106{
3107 struct nfs4_client_reclaim *crp;
3108
3109 if ((crp = nfs4_find_reclaim_client(clid)) == NULL)
3110 return nfserr_reclaim_bad;
3111 return nfs_ok;
3112}
3113
3114
3115/*
3116 * Start and stop routines
3117 */
3118
3119static void
3120__nfs4_state_init(void)
3121{
3122 int i;
3123 time_t grace_time;
3124
3125 if (!nfs4_reclaim_init) {
3126 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3127 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3128 reclaim_str_hashtbl_size = 0;
3129 nfs4_reclaim_init = 1;
3130 }
3131 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3132 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3133 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3134 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3135 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3136 }
3137 for (i = 0; i < FILE_HASH_SIZE; i++) {
3138 INIT_LIST_HEAD(&file_hashtbl[i]);
3139 }
3140 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3141 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3142 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3143 }
3144 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3145 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3146 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3147 }
3148 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3149 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3150 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3151 }
3152 memset(&zerostateid, 0, sizeof(stateid_t));
3153 memset(&onestateid, ~0, sizeof(stateid_t));
3154
3155 INIT_LIST_HEAD(&close_lru);
3156 INIT_LIST_HEAD(&client_lru);
3157 INIT_LIST_HEAD(&del_recall_lru);
3158 spin_lock_init(&recall_lock);
3159 boot_time = get_seconds();
3160 grace_time = max(old_lease_time, lease_time);
3161 if (reclaim_str_hashtbl_size == 0)
3162 grace_time = 0;
3163 if (grace_time)
3164 printk("NFSD: starting %ld-second grace period\n", grace_time);
3165 grace_end = boot_time + grace_time;
3166 INIT_WORK(&laundromat_work,laundromat_main, NULL);
3167 schedule_delayed_work(&laundromat_work, NFSD_LEASE_TIME*HZ);
3168}
3169
3170int
3171nfs4_state_init(void)
3172{
3173 int status;
3174
3175 if (nfs4_init)
3176 return 0;
3177 status = nfsd4_init_slabs();
3178 if (status)
3179 return status;
3180 __nfs4_state_init();
3181 nfs4_init = 1;
3182 return 0;
3183}
3184
3185int
3186nfs4_in_grace(void)
3187{
3188 return get_seconds() < grace_end;
3189}
3190
3191void
3192set_no_grace(void)
3193{
3194 printk("NFSD: ERROR in reboot recovery. State reclaims will fail.\n");
3195 grace_end = get_seconds();
3196}
3197
3198time_t
3199nfs4_lease_time(void)
3200{
3201 return lease_time;
3202}
3203
3204static void
3205__nfs4_state_shutdown(void)
3206{
3207 int i;
3208 struct nfs4_client *clp = NULL;
3209 struct nfs4_delegation *dp = NULL;
3210 struct nfs4_stateowner *sop = NULL;
3211 struct list_head *pos, *next, reaplist;
3212
3213 list_for_each_safe(pos, next, &close_lru) {
3214 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
3215 list_del(&sop->so_close_lru);
3216 nfs4_put_stateowner(sop);
3217 }
3218
3219 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3220 while (!list_empty(&conf_id_hashtbl[i])) {
3221 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3222 expire_client(clp);
3223 }
3224 while (!list_empty(&unconf_str_hashtbl[i])) {
3225 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3226 expire_client(clp);
3227 }
3228 }
3229 INIT_LIST_HEAD(&reaplist);
3230 spin_lock(&recall_lock);
3231 list_for_each_safe(pos, next, &del_recall_lru) {
3232 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3233 list_move(&dp->dl_recall_lru, &reaplist);
3234 }
3235 spin_unlock(&recall_lock);
3236 list_for_each_safe(pos, next, &reaplist) {
3237 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3238 list_del_init(&dp->dl_recall_lru);
3239 unhash_delegation(dp);
3240 }
3241
3242 release_all_files();
3243 cancel_delayed_work(&laundromat_work);
3244 flush_scheduled_work();
3245 nfs4_init = 0;
3246 dprintk("NFSD: list_add_perfile %d list_del_perfile %d\n",
3247 list_add_perfile, list_del_perfile);
3248 dprintk("NFSD: add_perclient %d del_perclient %d\n",
3249 add_perclient, del_perclient);
3250 dprintk("NFSD: alloc_file %d free_file %d\n",
3251 alloc_file, free_file);
3252 dprintk("NFSD: vfsopen %d vfsclose %d\n",
3253 vfsopen, vfsclose);
3254 dprintk("NFSD: alloc_delegation %d free_delegation %d\n",
3255 alloc_delegation, free_delegation);
3256
3257}
3258
3259void
3260nfs4_state_shutdown(void)
3261{
3262 nfs4_lock_state();
3263 nfs4_release_reclaim();
3264 __nfs4_state_shutdown();
3265 nfsd4_free_slabs();
3266 nfs4_unlock_state();
3267}
3268
3269/*
3270 * Called when leasetime is changed.
3271 *
3272 * if nfsd is not started, simply set the global lease.
3273 *
3274 * if nfsd(s) are running, lease change requires nfsv4 state to be reset.
3275 * e.g: boot_time is reset, existing nfs4_client structs are
3276 * used to fill reclaim_str_hashtbl, then all state (except for the
3277 * reclaim_str_hashtbl) is re-initialized.
3278 *
3279 * if the old lease time is greater than the new lease time, the grace
3280 * period needs to be set to the old lease time to allow clients to reclaim
3281 * their state. XXX - we may want to set the grace period == lease time
3282 * after an initial grace period == old lease time
3283 *
3284 * if an error occurs in this process, the new lease is set, but the server
3285 * will not honor OPEN or LOCK reclaims, and will return nfserr_no_grace
3286 * which means OPEN/LOCK/READ/WRITE will fail during grace period.
3287 *
3288 * clients will attempt to reset all state with SETCLIENTID/CONFIRM, and
3289 * OPEN and LOCK reclaims.
3290 */
3291void
3292nfs4_reset_lease(time_t leasetime)
3293{
3294 struct nfs4_client *clp;
3295 int i;
3296
3297 printk("NFSD: New leasetime %ld\n",leasetime);
3298 if (!nfs4_init)
3299 return;
3300 nfs4_lock_state();
3301 old_lease_time = lease_time;
3302 lease_time = leasetime;
3303
3304 nfs4_release_reclaim();
3305
3306 /* populate reclaim_str_hashtbl with current confirmed nfs4_clientid */
3307 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3308 list_for_each_entry(clp, &conf_id_hashtbl[i], cl_idhash) {
3309 if (!nfs4_client_to_reclaim(clp->cl_name.data,
3310 clp->cl_name.len)) {
3311 nfs4_release_reclaim();
3312 goto init_state;
3313 }
3314 }
3315 }
3316init_state:
3317 __nfs4_state_shutdown();
3318 __nfs4_state_init();
3319 nfs4_unlock_state();
3320}
3321
Linux 6.x block layer and io_uring tree(s)