2 * linux/fs/nfsd/nfs4state.c
4 * Copyright (c) 2001 The Regents of the University of Michigan.
7 * Kendrick Smith <kmsmith@umich.edu>
8 * Andy Adamson <kandros@umich.edu>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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.
37 #include <linux/param.h>
38 #include <linux/major.h>
39 #include <linux/slab.h>
41 #include <linux/sunrpc/svc.h>
42 #include <linux/nfsd/nfsd.h>
43 #include <linux/nfsd/cache.h>
44 #include <linux/file.h>
45 #include <linux/mount.h>
46 #include <linux/workqueue.h>
47 #include <linux/smp_lock.h>
48 #include <linux/kthread.h>
49 #include <linux/nfs4.h>
50 #include <linux/nfsd/state.h>
51 #include <linux/nfsd/xdr4.h>
52 #include <linux/namei.h>
53 #include <linux/swap.h>
54 #include <linux/mutex.h>
55 #include <linux/lockd/bind.h>
56 #include <linux/module.h>
57 #include <linux/sunrpc/svcauth_gss.h>
59 #define NFSDDBG_FACILITY NFSDDBG_PROC
62 static time_t lease_time = 90; /* default lease time */
63 static time_t user_lease_time = 90;
64 static time_t boot_time;
65 static u32 current_ownerid = 1;
66 static u32 current_fileid = 1;
67 static u32 current_delegid = 1;
69 static stateid_t zerostateid; /* bits all 0 */
70 static stateid_t onestateid; /* bits all 1 */
72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
73 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
75 /* forward declarations */
76 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
77 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
78 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
79 static void nfs4_set_recdir(char *recdir);
83 /* Currently used for almost all code touching nfsv4 state: */
84 static DEFINE_MUTEX(client_mutex);
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
91 static DEFINE_SPINLOCK(recall_lock);
93 static struct kmem_cache *stateowner_slab = NULL;
94 static struct kmem_cache *file_slab = NULL;
95 static struct kmem_cache *stateid_slab = NULL;
96 static struct kmem_cache *deleg_slab = NULL;
101 mutex_lock(&client_mutex);
105 nfs4_unlock_state(void)
107 mutex_unlock(&client_mutex);
111 opaque_hashval(const void *ptr, int nbytes)
113 unsigned char *cptr = (unsigned char *) ptr;
123 static struct list_head del_recall_lru;
126 put_nfs4_file(struct nfs4_file *fi)
128 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
129 list_del(&fi->fi_hash);
130 spin_unlock(&recall_lock);
132 kmem_cache_free(file_slab, fi);
137 get_nfs4_file(struct nfs4_file *fi)
139 atomic_inc(&fi->fi_ref);
142 static int num_delegations;
143 unsigned int max_delegations;
146 * Open owner state (share locks)
149 /* hash tables for nfs4_stateowner */
150 #define OWNER_HASH_BITS 8
151 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
152 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
154 #define ownerid_hashval(id) \
155 ((id) & OWNER_HASH_MASK)
156 #define ownerstr_hashval(clientid, ownername) \
157 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
159 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
160 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
162 /* hash table for nfs4_file */
163 #define FILE_HASH_BITS 8
164 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
165 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
166 /* hash table for (open)nfs4_stateid */
167 #define STATEID_HASH_BITS 10
168 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
169 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
171 #define file_hashval(x) \
172 hash_ptr(x, FILE_HASH_BITS)
173 #define stateid_hashval(owner_id, file_id) \
174 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
176 static struct list_head file_hashtbl[FILE_HASH_SIZE];
177 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
179 static struct nfs4_delegation *
180 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
182 struct nfs4_delegation *dp;
183 struct nfs4_file *fp = stp->st_file;
184 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
186 dprintk("NFSD alloc_init_deleg\n");
187 if (fp->fi_had_conflict)
189 if (num_delegations > max_delegations)
191 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
195 INIT_LIST_HEAD(&dp->dl_perfile);
196 INIT_LIST_HEAD(&dp->dl_perclnt);
197 INIT_LIST_HEAD(&dp->dl_recall_lru);
202 get_file(stp->st_vfs_file);
203 dp->dl_vfs_file = stp->st_vfs_file;
205 dp->dl_recall.cbr_dp = NULL;
206 dp->dl_recall.cbr_ident = cb->cb_ident;
207 dp->dl_recall.cbr_trunc = 0;
208 dp->dl_stateid.si_boot = boot_time;
209 dp->dl_stateid.si_stateownerid = current_delegid++;
210 dp->dl_stateid.si_fileid = 0;
211 dp->dl_stateid.si_generation = 0;
212 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
214 atomic_set(&dp->dl_count, 1);
215 list_add(&dp->dl_perfile, &fp->fi_delegations);
216 list_add(&dp->dl_perclnt, &clp->cl_delegations);
221 nfs4_put_delegation(struct nfs4_delegation *dp)
223 if (atomic_dec_and_test(&dp->dl_count)) {
224 dprintk("NFSD: freeing dp %p\n",dp);
225 put_nfs4_file(dp->dl_file);
226 kmem_cache_free(deleg_slab, dp);
231 /* Remove the associated file_lock first, then remove the delegation.
232 * lease_modify() is called to remove the FS_LEASE file_lock from
233 * the i_flock list, eventually calling nfsd's lock_manager
234 * fl_release_callback.
237 nfs4_close_delegation(struct nfs4_delegation *dp)
239 struct file *filp = dp->dl_vfs_file;
241 dprintk("NFSD: close_delegation dp %p\n",dp);
242 dp->dl_vfs_file = NULL;
243 /* The following nfsd_close may not actually close the file,
244 * but we want to remove the lease in any case. */
246 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
250 /* Called under the state lock. */
252 unhash_delegation(struct nfs4_delegation *dp)
254 list_del_init(&dp->dl_perfile);
255 list_del_init(&dp->dl_perclnt);
256 spin_lock(&recall_lock);
257 list_del_init(&dp->dl_recall_lru);
258 spin_unlock(&recall_lock);
259 nfs4_close_delegation(dp);
260 nfs4_put_delegation(dp);
267 /* Hash tables for nfs4_clientid state */
268 #define CLIENT_HASH_BITS 4
269 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
270 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
272 #define clientid_hashval(id) \
273 ((id) & CLIENT_HASH_MASK)
274 #define clientstr_hashval(name) \
275 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
277 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
278 * used in reboot/reset lease grace period processing
280 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
281 * setclientid_confirmed info.
283 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
286 * client_lru holds client queue ordered by nfs4_client.cl_time
289 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
290 * for last close replay.
292 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
293 static int reclaim_str_hashtbl_size = 0;
294 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
295 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
296 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
297 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
298 static struct list_head client_lru;
299 static struct list_head close_lru;
301 static void unhash_generic_stateid(struct nfs4_stateid *stp)
303 list_del(&stp->st_hash);
304 list_del(&stp->st_perfile);
305 list_del(&stp->st_perstateowner);
308 static void free_generic_stateid(struct nfs4_stateid *stp)
310 put_nfs4_file(stp->st_file);
311 kmem_cache_free(stateid_slab, stp);
314 static void release_lock_stateid(struct nfs4_stateid *stp)
316 unhash_generic_stateid(stp);
317 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
318 free_generic_stateid(stp);
321 static void unhash_lockowner(struct nfs4_stateowner *sop)
323 struct nfs4_stateid *stp;
325 list_del(&sop->so_idhash);
326 list_del(&sop->so_strhash);
327 list_del(&sop->so_perstateid);
328 while (!list_empty(&sop->so_stateids)) {
329 stp = list_first_entry(&sop->so_stateids,
330 struct nfs4_stateid, st_perstateowner);
331 release_lock_stateid(stp);
335 static void release_lockowner(struct nfs4_stateowner *sop)
337 unhash_lockowner(sop);
338 nfs4_put_stateowner(sop);
342 release_stateid_lockowners(struct nfs4_stateid *open_stp)
344 struct nfs4_stateowner *lock_sop;
346 while (!list_empty(&open_stp->st_lockowners)) {
347 lock_sop = list_entry(open_stp->st_lockowners.next,
348 struct nfs4_stateowner, so_perstateid);
349 /* list_del(&open_stp->st_lockowners); */
350 BUG_ON(lock_sop->so_is_open_owner);
351 release_lockowner(lock_sop);
355 static void release_open_stateid(struct nfs4_stateid *stp)
357 unhash_generic_stateid(stp);
358 release_stateid_lockowners(stp);
359 nfsd_close(stp->st_vfs_file);
360 free_generic_stateid(stp);
363 static void unhash_openowner(struct nfs4_stateowner *sop)
365 struct nfs4_stateid *stp;
367 list_del(&sop->so_idhash);
368 list_del(&sop->so_strhash);
369 list_del(&sop->so_perclient);
370 list_del(&sop->so_perstateid); /* XXX: necessary? */
371 while (!list_empty(&sop->so_stateids)) {
372 stp = list_first_entry(&sop->so_stateids,
373 struct nfs4_stateid, st_perstateowner);
374 release_open_stateid(stp);
378 static void release_openowner(struct nfs4_stateowner *sop)
380 unhash_openowner(sop);
381 list_del(&sop->so_close_lru);
382 nfs4_put_stateowner(sop);
386 renew_client(struct nfs4_client *clp)
389 * Move client to the end to the LRU list.
391 dprintk("renewing client (clientid %08x/%08x)\n",
392 clp->cl_clientid.cl_boot,
393 clp->cl_clientid.cl_id);
394 list_move_tail(&clp->cl_lru, &client_lru);
395 clp->cl_time = get_seconds();
398 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
400 STALE_CLIENTID(clientid_t *clid)
402 if (clid->cl_boot == boot_time)
404 dprintk("NFSD stale clientid (%08x/%08x)\n",
405 clid->cl_boot, clid->cl_id);
410 * XXX Should we use a slab cache ?
411 * This type of memory management is somewhat inefficient, but we use it
412 * anyway since SETCLIENTID is not a common operation.
414 static struct nfs4_client *alloc_client(struct xdr_netobj name)
416 struct nfs4_client *clp;
418 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
421 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
422 if (clp->cl_name.data == NULL) {
426 memcpy(clp->cl_name.data, name.data, name.len);
427 clp->cl_name.len = name.len;
432 shutdown_callback_client(struct nfs4_client *clp)
434 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
438 * Callback threads take a reference on the client, so there
439 * should be no outstanding callbacks at this point.
441 clp->cl_callback.cb_client = NULL;
442 rpc_shutdown_client(clnt);
447 free_client(struct nfs4_client *clp)
449 shutdown_callback_client(clp);
450 if (clp->cl_cred.cr_group_info)
451 put_group_info(clp->cl_cred.cr_group_info);
452 kfree(clp->cl_principal);
453 kfree(clp->cl_name.data);
458 put_nfs4_client(struct nfs4_client *clp)
460 if (atomic_dec_and_test(&clp->cl_count))
465 expire_client(struct nfs4_client *clp)
467 struct nfs4_stateowner *sop;
468 struct nfs4_delegation *dp;
469 struct list_head reaplist;
471 dprintk("NFSD: expire_client cl_count %d\n",
472 atomic_read(&clp->cl_count));
474 INIT_LIST_HEAD(&reaplist);
475 spin_lock(&recall_lock);
476 while (!list_empty(&clp->cl_delegations)) {
477 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
478 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
480 list_del_init(&dp->dl_perclnt);
481 list_move(&dp->dl_recall_lru, &reaplist);
483 spin_unlock(&recall_lock);
484 while (!list_empty(&reaplist)) {
485 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
486 list_del_init(&dp->dl_recall_lru);
487 unhash_delegation(dp);
489 list_del(&clp->cl_idhash);
490 list_del(&clp->cl_strhash);
491 list_del(&clp->cl_lru);
492 while (!list_empty(&clp->cl_openowners)) {
493 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
494 release_openowner(sop);
496 put_nfs4_client(clp);
499 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
501 struct nfs4_client *clp;
503 clp = alloc_client(name);
506 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
507 atomic_set(&clp->cl_count, 1);
508 atomic_set(&clp->cl_callback.cb_set, 0);
509 INIT_LIST_HEAD(&clp->cl_idhash);
510 INIT_LIST_HEAD(&clp->cl_strhash);
511 INIT_LIST_HEAD(&clp->cl_openowners);
512 INIT_LIST_HEAD(&clp->cl_delegations);
513 INIT_LIST_HEAD(&clp->cl_lru);
517 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
519 memcpy(target->cl_verifier.data, source->data,
520 sizeof(target->cl_verifier.data));
523 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
525 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
526 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
529 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
531 target->cr_uid = source->cr_uid;
532 target->cr_gid = source->cr_gid;
533 target->cr_group_info = source->cr_group_info;
534 get_group_info(target->cr_group_info);
537 static int same_name(const char *n1, const char *n2)
539 return 0 == memcmp(n1, n2, HEXDIR_LEN);
543 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
545 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
549 same_clid(clientid_t *cl1, clientid_t *cl2)
551 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
554 /* XXX what about NGROUP */
556 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
558 return cr1->cr_uid == cr2->cr_uid;
561 static void gen_clid(struct nfs4_client *clp)
563 static u32 current_clientid = 1;
565 clp->cl_clientid.cl_boot = boot_time;
566 clp->cl_clientid.cl_id = current_clientid++;
569 static void gen_confirm(struct nfs4_client *clp)
574 p = (u32 *)clp->cl_confirm.data;
575 *p++ = get_seconds();
579 static int check_name(struct xdr_netobj name)
583 if (name.len > NFS4_OPAQUE_LIMIT) {
584 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
591 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
593 unsigned int idhashval;
595 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
596 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
597 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
598 list_add_tail(&clp->cl_lru, &client_lru);
599 clp->cl_time = get_seconds();
603 move_to_confirmed(struct nfs4_client *clp)
605 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
606 unsigned int strhashval;
608 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
609 list_del_init(&clp->cl_strhash);
610 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
611 strhashval = clientstr_hashval(clp->cl_recdir);
612 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
616 static struct nfs4_client *
617 find_confirmed_client(clientid_t *clid)
619 struct nfs4_client *clp;
620 unsigned int idhashval = clientid_hashval(clid->cl_id);
622 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
623 if (same_clid(&clp->cl_clientid, clid))
629 static struct nfs4_client *
630 find_unconfirmed_client(clientid_t *clid)
632 struct nfs4_client *clp;
633 unsigned int idhashval = clientid_hashval(clid->cl_id);
635 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
636 if (same_clid(&clp->cl_clientid, clid))
642 static struct nfs4_client *
643 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
645 struct nfs4_client *clp;
647 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
648 if (same_name(clp->cl_recdir, dname))
654 static struct nfs4_client *
655 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
657 struct nfs4_client *clp;
659 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
660 if (same_name(clp->cl_recdir, dname))
666 /* a helper function for parse_callback */
668 parse_octet(unsigned int *lenp, char **addrp)
670 unsigned int len = *lenp;
682 if ((c < '0') || (c > '9')) {
688 n = (n * 10) + (c - '0');
699 /* parse and set the setclientid ipv4 callback address */
701 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
706 u32 addrlen = addr_len;
707 char *addr = addr_val;
712 for(i = 4; i > 0 ; i--) {
713 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
716 cbaddr |= (temp << shift);
724 for(i = 2; i > 0 ; i--) {
725 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
728 cbport |= (temp << shift);
737 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
739 struct nfs4_callback *cb = &clp->cl_callback;
741 /* Currently, we only support tcp for the callback channel */
742 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
745 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
746 &cb->cb_addr, &cb->cb_port)))
748 cb->cb_prog = se->se_callback_prog;
749 cb->cb_ident = se->se_callback_ident;
752 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
753 "will not receive delegations\n",
754 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
760 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
761 struct nfsd4_setclientid *setclid)
763 struct sockaddr_in *sin = svc_addr_in(rqstp);
764 struct xdr_netobj clname = {
765 .len = setclid->se_namelen,
766 .data = setclid->se_name,
768 nfs4_verifier clverifier = setclid->se_verf;
769 unsigned int strhashval;
770 struct nfs4_client *conf, *unconf, *new;
773 char dname[HEXDIR_LEN];
775 if (!check_name(clname))
778 status = nfs4_make_rec_clidname(dname, &clname);
783 * XXX The Duplicate Request Cache (DRC) has been checked (??)
784 * We get here on a DRC miss.
787 strhashval = clientstr_hashval(dname);
790 conf = find_confirmed_client_by_str(dname, strhashval);
792 /* RFC 3530 14.2.33 CASE 0: */
793 status = nfserr_clid_inuse;
794 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
795 dprintk("NFSD: setclientid: string in use by client"
796 " at %pI4\n", &conf->cl_addr);
801 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
802 * has a description of SETCLIENTID request processing consisting
803 * of 5 bullet points, labeled as CASE0 - CASE4 below.
805 unconf = find_unconfirmed_client_by_str(dname, strhashval);
806 status = nfserr_resource;
809 * RFC 3530 14.2.33 CASE 4:
810 * placed first, because it is the normal case
813 expire_client(unconf);
814 new = create_client(clname, dname);
818 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
820 * RFC 3530 14.2.33 CASE 1:
821 * probable callback update
824 /* Note this is removing unconfirmed {*x***},
825 * which is stronger than RFC recommended {vxc**}.
826 * This has the advantage that there is at most
827 * one {*x***} in either list at any time.
829 expire_client(unconf);
831 new = create_client(clname, dname);
834 copy_clid(new, conf);
835 } else if (!unconf) {
837 * RFC 3530 14.2.33 CASE 2:
838 * probable client reboot; state will be removed if
841 new = create_client(clname, dname);
847 * RFC 3530 14.2.33 CASE 3:
848 * probable client reboot; state will be removed if
851 expire_client(unconf);
852 new = create_client(clname, dname);
857 copy_verf(new, &clverifier);
858 new->cl_addr = sin->sin_addr.s_addr;
859 new->cl_flavor = rqstp->rq_flavor;
860 princ = svc_gss_principal(rqstp);
862 new->cl_principal = kstrdup(princ, GFP_KERNEL);
863 if (new->cl_principal == NULL) {
868 copy_cred(&new->cl_cred, &rqstp->rq_cred);
870 gen_callback(new, setclid);
871 add_to_unconfirmed(new, strhashval);
872 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
873 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
874 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
883 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
884 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
885 * bullets, labeled as CASE1 - CASE4 below.
888 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
889 struct nfsd4_compound_state *cstate,
890 struct nfsd4_setclientid_confirm *setclientid_confirm)
892 struct sockaddr_in *sin = svc_addr_in(rqstp);
893 struct nfs4_client *conf, *unconf;
894 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
895 clientid_t * clid = &setclientid_confirm->sc_clientid;
898 if (STALE_CLIENTID(clid))
899 return nfserr_stale_clientid;
901 * XXX The Duplicate Request Cache (DRC) has been checked (??)
902 * We get here on a DRC miss.
907 conf = find_confirmed_client(clid);
908 unconf = find_unconfirmed_client(clid);
910 status = nfserr_clid_inuse;
911 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
913 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
917 * section 14.2.34 of RFC 3530 has a description of
918 * SETCLIENTID_CONFIRM request processing consisting
919 * of 4 bullet points, labeled as CASE1 - CASE4 below.
921 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
923 * RFC 3530 14.2.34 CASE 1:
926 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
927 status = nfserr_clid_inuse;
929 /* XXX: We just turn off callbacks until we can handle
930 * change request correctly. */
931 atomic_set(&conf->cl_callback.cb_set, 0);
933 nfsd4_remove_clid_dir(unconf);
934 expire_client(unconf);
938 } else if (conf && !unconf) {
940 * RFC 3530 14.2.34 CASE 2:
941 * probable retransmitted request; play it safe and
944 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
945 status = nfserr_clid_inuse;
948 } else if (!conf && unconf
949 && same_verf(&unconf->cl_confirm, &confirm)) {
951 * RFC 3530 14.2.34 CASE 3:
952 * Normal case; new or rebooted client:
954 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
955 status = nfserr_clid_inuse;
958 clientstr_hashval(unconf->cl_recdir);
959 conf = find_confirmed_client_by_str(unconf->cl_recdir,
962 nfsd4_remove_clid_dir(conf);
965 move_to_confirmed(unconf);
967 nfsd4_probe_callback(conf);
970 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
971 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
974 * RFC 3530 14.2.34 CASE 4:
975 * Client probably hasn't noticed that we rebooted yet.
977 status = nfserr_stale_clientid;
979 /* check that we have hit one of the cases...*/
980 status = nfserr_clid_inuse;
987 /* OPEN Share state helper functions */
988 static inline struct nfs4_file *
989 alloc_init_file(struct inode *ino)
991 struct nfs4_file *fp;
992 unsigned int hashval = file_hashval(ino);
994 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
996 atomic_set(&fp->fi_ref, 1);
997 INIT_LIST_HEAD(&fp->fi_hash);
998 INIT_LIST_HEAD(&fp->fi_stateids);
999 INIT_LIST_HEAD(&fp->fi_delegations);
1000 spin_lock(&recall_lock);
1001 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1002 spin_unlock(&recall_lock);
1003 fp->fi_inode = igrab(ino);
1004 fp->fi_id = current_fileid++;
1005 fp->fi_had_conflict = false;
1012 nfsd4_free_slab(struct kmem_cache **slab)
1016 kmem_cache_destroy(*slab);
1021 nfsd4_free_slabs(void)
1023 nfsd4_free_slab(&stateowner_slab);
1024 nfsd4_free_slab(&file_slab);
1025 nfsd4_free_slab(&stateid_slab);
1026 nfsd4_free_slab(&deleg_slab);
1030 nfsd4_init_slabs(void)
1032 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1033 sizeof(struct nfs4_stateowner), 0, 0, NULL);
1034 if (stateowner_slab == NULL)
1036 file_slab = kmem_cache_create("nfsd4_files",
1037 sizeof(struct nfs4_file), 0, 0, NULL);
1038 if (file_slab == NULL)
1040 stateid_slab = kmem_cache_create("nfsd4_stateids",
1041 sizeof(struct nfs4_stateid), 0, 0, NULL);
1042 if (stateid_slab == NULL)
1044 deleg_slab = kmem_cache_create("nfsd4_delegations",
1045 sizeof(struct nfs4_delegation), 0, 0, NULL);
1046 if (deleg_slab == NULL)
1051 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1056 nfs4_free_stateowner(struct kref *kref)
1058 struct nfs4_stateowner *sop =
1059 container_of(kref, struct nfs4_stateowner, so_ref);
1060 kfree(sop->so_owner.data);
1061 kmem_cache_free(stateowner_slab, sop);
1064 static inline struct nfs4_stateowner *
1065 alloc_stateowner(struct xdr_netobj *owner)
1067 struct nfs4_stateowner *sop;
1069 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1070 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1071 memcpy(sop->so_owner.data, owner->data, owner->len);
1072 sop->so_owner.len = owner->len;
1073 kref_init(&sop->so_ref);
1076 kmem_cache_free(stateowner_slab, sop);
1081 static struct nfs4_stateowner *
1082 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1083 struct nfs4_stateowner *sop;
1084 struct nfs4_replay *rp;
1085 unsigned int idhashval;
1087 if (!(sop = alloc_stateowner(&open->op_owner)))
1089 idhashval = ownerid_hashval(current_ownerid);
1090 INIT_LIST_HEAD(&sop->so_idhash);
1091 INIT_LIST_HEAD(&sop->so_strhash);
1092 INIT_LIST_HEAD(&sop->so_perclient);
1093 INIT_LIST_HEAD(&sop->so_stateids);
1094 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1095 INIT_LIST_HEAD(&sop->so_close_lru);
1097 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1098 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1099 list_add(&sop->so_perclient, &clp->cl_openowners);
1100 sop->so_is_open_owner = 1;
1101 sop->so_id = current_ownerid++;
1102 sop->so_client = clp;
1103 sop->so_seqid = open->op_seqid;
1104 sop->so_confirmed = 0;
1105 rp = &sop->so_replay;
1106 rp->rp_status = nfserr_serverfault;
1108 rp->rp_buf = rp->rp_ibuf;
1113 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1114 struct nfs4_stateowner *sop = open->op_stateowner;
1115 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1117 INIT_LIST_HEAD(&stp->st_hash);
1118 INIT_LIST_HEAD(&stp->st_perstateowner);
1119 INIT_LIST_HEAD(&stp->st_lockowners);
1120 INIT_LIST_HEAD(&stp->st_perfile);
1121 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1122 list_add(&stp->st_perstateowner, &sop->so_stateids);
1123 list_add(&stp->st_perfile, &fp->fi_stateids);
1124 stp->st_stateowner = sop;
1127 stp->st_stateid.si_boot = boot_time;
1128 stp->st_stateid.si_stateownerid = sop->so_id;
1129 stp->st_stateid.si_fileid = fp->fi_id;
1130 stp->st_stateid.si_generation = 0;
1131 stp->st_access_bmap = 0;
1132 stp->st_deny_bmap = 0;
1133 __set_bit(open->op_share_access, &stp->st_access_bmap);
1134 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1135 stp->st_openstp = NULL;
1139 move_to_close_lru(struct nfs4_stateowner *sop)
1141 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1143 list_move_tail(&sop->so_close_lru, &close_lru);
1144 sop->so_time = get_seconds();
1148 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1151 return (sop->so_owner.len == owner->len) &&
1152 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1153 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1156 static struct nfs4_stateowner *
1157 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1159 struct nfs4_stateowner *so = NULL;
1161 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1162 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1168 /* search file_hashtbl[] for file */
1169 static struct nfs4_file *
1170 find_file(struct inode *ino)
1172 unsigned int hashval = file_hashval(ino);
1173 struct nfs4_file *fp;
1175 spin_lock(&recall_lock);
1176 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1177 if (fp->fi_inode == ino) {
1179 spin_unlock(&recall_lock);
1183 spin_unlock(&recall_lock);
1187 static inline int access_valid(u32 x)
1189 if (x < NFS4_SHARE_ACCESS_READ)
1191 if (x > NFS4_SHARE_ACCESS_BOTH)
1196 static inline int deny_valid(u32 x)
1198 /* Note: unlike access bits, deny bits may be zero. */
1199 return x <= NFS4_SHARE_DENY_BOTH;
1203 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1204 * st_{access,deny}_bmap field of the stateid, in order to track not
1205 * only what share bits are currently in force, but also what
1206 * combinations of share bits previous opens have used. This allows us
1207 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1208 * return an error if the client attempt to downgrade to a combination
1209 * of share bits not explicable by closing some of its previous opens.
1211 * XXX: This enforcement is actually incomplete, since we don't keep
1212 * track of access/deny bit combinations; so, e.g., we allow:
1214 * OPEN allow read, deny write
1215 * OPEN allow both, deny none
1216 * DOWNGRADE allow read, deny none
1218 * which we should reject.
1221 set_access(unsigned int *access, unsigned long bmap) {
1225 for (i = 1; i < 4; i++) {
1226 if (test_bit(i, &bmap))
1232 set_deny(unsigned int *deny, unsigned long bmap) {
1236 for (i = 0; i < 4; i++) {
1237 if (test_bit(i, &bmap))
1243 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1244 unsigned int access, deny;
1246 set_access(&access, stp->st_access_bmap);
1247 set_deny(&deny, stp->st_deny_bmap);
1248 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1254 * Called to check deny when READ with all zero stateid or
1255 * WRITE with all zero or all one stateid
1258 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1260 struct inode *ino = current_fh->fh_dentry->d_inode;
1261 struct nfs4_file *fp;
1262 struct nfs4_stateid *stp;
1265 dprintk("NFSD: nfs4_share_conflict\n");
1267 fp = find_file(ino);
1270 ret = nfserr_locked;
1271 /* Search for conflicting share reservations */
1272 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1273 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1274 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1284 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1286 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1287 drop_file_write_access(filp);
1288 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1293 * Recall a delegation
1296 do_recall(void *__dp)
1298 struct nfs4_delegation *dp = __dp;
1300 dp->dl_file->fi_had_conflict = true;
1301 nfsd4_cb_recall(dp);
1306 * Spawn a thread to perform a recall on the delegation represented
1307 * by the lease (file_lock)
1309 * Called from break_lease() with lock_kernel() held.
1310 * Note: we assume break_lease will only call this *once* for any given
1314 void nfsd_break_deleg_cb(struct file_lock *fl)
1316 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1317 struct task_struct *t;
1319 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1323 /* We're assuming the state code never drops its reference
1324 * without first removing the lease. Since we're in this lease
1325 * callback (and since the lease code is serialized by the kernel
1326 * lock) we know the server hasn't removed the lease yet, we know
1327 * it's safe to take a reference: */
1328 atomic_inc(&dp->dl_count);
1329 atomic_inc(&dp->dl_client->cl_count);
1331 spin_lock(&recall_lock);
1332 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1333 spin_unlock(&recall_lock);
1335 /* only place dl_time is set. protected by lock_kernel*/
1336 dp->dl_time = get_seconds();
1339 * We don't want the locks code to timeout the lease for us;
1340 * we'll remove it ourself if the delegation isn't returned
1343 fl->fl_break_time = 0;
1345 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1347 struct nfs4_client *clp = dp->dl_client;
1349 printk(KERN_INFO "NFSD: Callback thread failed for "
1350 "for client (clientid %08x/%08x)\n",
1351 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1352 put_nfs4_client(dp->dl_client);
1353 nfs4_put_delegation(dp);
1358 * The file_lock is being reapd.
1360 * Called by locks_free_lock() with lock_kernel() held.
1363 void nfsd_release_deleg_cb(struct file_lock *fl)
1365 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1367 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1369 if (!(fl->fl_flags & FL_LEASE) || !dp)
1371 dp->dl_flock = NULL;
1375 * Set the delegation file_lock back pointer.
1377 * Called from setlease() with lock_kernel() held.
1380 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1382 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1384 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1391 * Called from setlease() with lock_kernel() held
1394 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1396 struct nfs4_delegation *onlistd =
1397 (struct nfs4_delegation *)onlist->fl_owner;
1398 struct nfs4_delegation *tryd =
1399 (struct nfs4_delegation *)try->fl_owner;
1401 if (onlist->fl_lmops != try->fl_lmops)
1404 return onlistd->dl_client == tryd->dl_client;
1409 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1412 return lease_modify(onlist, arg);
1417 static struct lock_manager_operations nfsd_lease_mng_ops = {
1418 .fl_break = nfsd_break_deleg_cb,
1419 .fl_release_private = nfsd_release_deleg_cb,
1420 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1421 .fl_mylease = nfsd_same_client_deleg_cb,
1422 .fl_change = nfsd_change_deleg_cb,
1427 nfsd4_process_open1(struct nfsd4_open *open)
1429 clientid_t *clientid = &open->op_clientid;
1430 struct nfs4_client *clp = NULL;
1431 unsigned int strhashval;
1432 struct nfs4_stateowner *sop = NULL;
1434 if (!check_name(open->op_owner))
1435 return nfserr_inval;
1437 if (STALE_CLIENTID(&open->op_clientid))
1438 return nfserr_stale_clientid;
1440 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1441 sop = find_openstateowner_str(strhashval, open);
1442 open->op_stateowner = sop;
1444 /* Make sure the client's lease hasn't expired. */
1445 clp = find_confirmed_client(clientid);
1447 return nfserr_expired;
1450 if (!sop->so_confirmed) {
1451 /* Replace unconfirmed owners without checking for replay. */
1452 clp = sop->so_client;
1453 release_openowner(sop);
1454 open->op_stateowner = NULL;
1457 if (open->op_seqid == sop->so_seqid - 1) {
1458 if (sop->so_replay.rp_buflen)
1459 return nfserr_replay_me;
1460 /* The original OPEN failed so spectacularly
1461 * that we don't even have replay data saved!
1462 * Therefore, we have no choice but to continue
1463 * processing this OPEN; presumably, we'll
1464 * fail again for the same reason.
1466 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1469 if (open->op_seqid != sop->so_seqid)
1470 return nfserr_bad_seqid;
1472 if (open->op_stateowner == NULL) {
1473 sop = alloc_init_open_stateowner(strhashval, clp, open);
1475 return nfserr_resource;
1476 open->op_stateowner = sop;
1478 list_del_init(&sop->so_close_lru);
1479 renew_client(sop->so_client);
1483 static inline __be32
1484 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1486 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1487 return nfserr_openmode;
1492 static struct nfs4_delegation *
1493 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1495 struct nfs4_delegation *dp;
1497 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1498 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1505 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1506 struct nfs4_delegation **dp)
1509 __be32 status = nfserr_bad_stateid;
1511 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1514 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1515 RD_STATE : WR_STATE;
1516 status = nfs4_check_delegmode(*dp, flags);
1520 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1524 open->op_stateowner->so_confirmed = 1;
1529 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1531 struct nfs4_stateid *local;
1532 __be32 status = nfserr_share_denied;
1533 struct nfs4_stateowner *sop = open->op_stateowner;
1535 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1536 /* ignore lock owners */
1537 if (local->st_stateowner->so_is_open_owner == 0)
1539 /* remember if we have seen this open owner */
1540 if (local->st_stateowner == sop)
1542 /* check for conflicting share reservations */
1543 if (!test_share(local, open))
1551 static inline struct nfs4_stateid *
1552 nfs4_alloc_stateid(void)
1554 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1558 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1559 struct nfs4_delegation *dp,
1560 struct svc_fh *cur_fh, int flags)
1562 struct nfs4_stateid *stp;
1564 stp = nfs4_alloc_stateid();
1566 return nfserr_resource;
1569 get_file(dp->dl_vfs_file);
1570 stp->st_vfs_file = dp->dl_vfs_file;
1573 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1576 if (status == nfserr_dropit)
1577 status = nfserr_jukebox;
1578 kmem_cache_free(stateid_slab, stp);
1586 static inline __be32
1587 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1588 struct nfsd4_open *open)
1590 struct iattr iattr = {
1591 .ia_valid = ATTR_SIZE,
1594 if (!open->op_truncate)
1596 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1597 return nfserr_inval;
1598 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1602 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1604 struct file *filp = stp->st_vfs_file;
1605 struct inode *inode = filp->f_path.dentry->d_inode;
1606 unsigned int share_access, new_writer;
1609 set_access(&share_access, stp->st_access_bmap);
1610 new_writer = (~share_access) & open->op_share_access
1611 & NFS4_SHARE_ACCESS_WRITE;
1614 int err = get_write_access(inode);
1616 return nfserrno(err);
1617 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1619 return nfserrno(err);
1620 file_take_write(filp);
1622 status = nfsd4_truncate(rqstp, cur_fh, open);
1625 put_write_access(inode);
1628 /* remember the open */
1629 filp->f_mode |= open->op_share_access;
1630 __set_bit(open->op_share_access, &stp->st_access_bmap);
1631 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1638 nfs4_set_claim_prev(struct nfsd4_open *open)
1640 open->op_stateowner->so_confirmed = 1;
1641 open->op_stateowner->so_client->cl_firststate = 1;
1645 * Attempt to hand out a delegation.
1648 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1650 struct nfs4_delegation *dp;
1651 struct nfs4_stateowner *sop = stp->st_stateowner;
1652 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1653 struct file_lock fl, *flp = &fl;
1654 int status, flag = 0;
1656 flag = NFS4_OPEN_DELEGATE_NONE;
1657 open->op_recall = 0;
1658 switch (open->op_claim_type) {
1659 case NFS4_OPEN_CLAIM_PREVIOUS:
1660 if (!atomic_read(&cb->cb_set))
1661 open->op_recall = 1;
1662 flag = open->op_delegate_type;
1663 if (flag == NFS4_OPEN_DELEGATE_NONE)
1666 case NFS4_OPEN_CLAIM_NULL:
1667 /* Let's not give out any delegations till everyone's
1668 * had the chance to reclaim theirs.... */
1669 if (locks_in_grace())
1671 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1673 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1674 flag = NFS4_OPEN_DELEGATE_WRITE;
1676 flag = NFS4_OPEN_DELEGATE_READ;
1682 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1684 flag = NFS4_OPEN_DELEGATE_NONE;
1687 locks_init_lock(&fl);
1688 fl.fl_lmops = &nfsd_lease_mng_ops;
1689 fl.fl_flags = FL_LEASE;
1690 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1691 fl.fl_end = OFFSET_MAX;
1692 fl.fl_owner = (fl_owner_t)dp;
1693 fl.fl_file = stp->st_vfs_file;
1694 fl.fl_pid = current->tgid;
1696 /* vfs_setlease checks to see if delegation should be handed out.
1697 * the lock_manager callbacks fl_mylease and fl_change are used
1699 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1700 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1701 unhash_delegation(dp);
1702 flag = NFS4_OPEN_DELEGATE_NONE;
1706 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1708 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1709 dp->dl_stateid.si_boot,
1710 dp->dl_stateid.si_stateownerid,
1711 dp->dl_stateid.si_fileid,
1712 dp->dl_stateid.si_generation);
1714 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1715 && flag == NFS4_OPEN_DELEGATE_NONE
1716 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1717 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1718 open->op_delegate_type = flag;
1722 * called with nfs4_lock_state() held.
1725 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1727 struct nfs4_file *fp = NULL;
1728 struct inode *ino = current_fh->fh_dentry->d_inode;
1729 struct nfs4_stateid *stp = NULL;
1730 struct nfs4_delegation *dp = NULL;
1733 status = nfserr_inval;
1734 if (!access_valid(open->op_share_access)
1735 || !deny_valid(open->op_share_deny))
1738 * Lookup file; if found, lookup stateid and check open request,
1739 * and check for delegations in the process of being recalled.
1740 * If not found, create the nfs4_file struct
1742 fp = find_file(ino);
1744 if ((status = nfs4_check_open(fp, open, &stp)))
1746 status = nfs4_check_deleg(fp, open, &dp);
1750 status = nfserr_bad_stateid;
1751 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1753 status = nfserr_resource;
1754 fp = alloc_init_file(ino);
1760 * OPEN the file, or upgrade an existing OPEN.
1761 * If truncate fails, the OPEN fails.
1764 /* Stateid was found, this is an OPEN upgrade */
1765 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1768 update_stateid(&stp->st_stateid);
1770 /* Stateid was not found, this is a new OPEN */
1772 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1773 flags |= NFSD_MAY_READ;
1774 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1775 flags |= NFSD_MAY_WRITE;
1776 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1779 init_stateid(stp, fp, open);
1780 status = nfsd4_truncate(rqstp, current_fh, open);
1782 release_open_stateid(stp);
1786 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1789 * Attempt to hand out a delegation. No error return, because the
1790 * OPEN succeeds even if we fail.
1792 nfs4_open_delegation(current_fh, open, stp);
1796 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1797 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1798 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1802 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1803 nfs4_set_claim_prev(open);
1805 * To finish the open response, we just need to set the rflags.
1807 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1808 if (!open->op_stateowner->so_confirmed)
1809 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1815 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1818 struct nfs4_client *clp;
1822 dprintk("process_renew(%08x/%08x): starting\n",
1823 clid->cl_boot, clid->cl_id);
1824 status = nfserr_stale_clientid;
1825 if (STALE_CLIENTID(clid))
1827 clp = find_confirmed_client(clid);
1828 status = nfserr_expired;
1830 /* We assume the client took too long to RENEW. */
1831 dprintk("nfsd4_renew: clientid not found!\n");
1835 status = nfserr_cb_path_down;
1836 if (!list_empty(&clp->cl_delegations)
1837 && !atomic_read(&clp->cl_callback.cb_set))
1841 nfs4_unlock_state();
1845 struct lock_manager nfsd4_manager = {
1849 nfsd4_end_grace(void)
1851 dprintk("NFSD: end of grace period\n");
1852 nfsd4_recdir_purge_old();
1853 locks_end_grace(&nfsd4_manager);
1857 nfs4_laundromat(void)
1859 struct nfs4_client *clp;
1860 struct nfs4_stateowner *sop;
1861 struct nfs4_delegation *dp;
1862 struct list_head *pos, *next, reaplist;
1863 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1864 time_t t, clientid_val = NFSD_LEASE_TIME;
1865 time_t u, test_val = NFSD_LEASE_TIME;
1869 dprintk("NFSD: laundromat service - starting\n");
1870 if (locks_in_grace())
1872 list_for_each_safe(pos, next, &client_lru) {
1873 clp = list_entry(pos, struct nfs4_client, cl_lru);
1874 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1875 t = clp->cl_time - cutoff;
1876 if (clientid_val > t)
1880 dprintk("NFSD: purging unused client (clientid %08x)\n",
1881 clp->cl_clientid.cl_id);
1882 nfsd4_remove_clid_dir(clp);
1885 INIT_LIST_HEAD(&reaplist);
1886 spin_lock(&recall_lock);
1887 list_for_each_safe(pos, next, &del_recall_lru) {
1888 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1889 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1890 u = dp->dl_time - cutoff;
1895 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1897 list_move(&dp->dl_recall_lru, &reaplist);
1899 spin_unlock(&recall_lock);
1900 list_for_each_safe(pos, next, &reaplist) {
1901 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1902 list_del_init(&dp->dl_recall_lru);
1903 unhash_delegation(dp);
1905 test_val = NFSD_LEASE_TIME;
1906 list_for_each_safe(pos, next, &close_lru) {
1907 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1908 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1909 u = sop->so_time - cutoff;
1914 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1916 release_openowner(sop);
1918 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1919 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1920 nfs4_unlock_state();
1921 return clientid_val;
1924 static struct workqueue_struct *laundry_wq;
1925 static void laundromat_main(struct work_struct *);
1926 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1929 laundromat_main(struct work_struct *not_used)
1933 t = nfs4_laundromat();
1934 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1935 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1938 static struct nfs4_stateowner *
1939 search_close_lru(u32 st_id, int flags)
1941 struct nfs4_stateowner *local = NULL;
1943 if (flags & CLOSE_STATE) {
1944 list_for_each_entry(local, &close_lru, so_close_lru) {
1945 if (local->so_id == st_id)
1953 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1955 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1959 STALE_STATEID(stateid_t *stateid)
1961 if (stateid->si_boot == boot_time)
1963 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1964 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1965 stateid->si_generation);
1970 access_permit_read(unsigned long access_bmap)
1972 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1973 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1974 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1978 access_permit_write(unsigned long access_bmap)
1980 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1981 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1985 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1987 __be32 status = nfserr_openmode;
1989 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1991 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1998 static inline __be32
1999 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2001 if (ONE_STATEID(stateid) && (flags & RD_STATE))
2003 else if (locks_in_grace()) {
2004 /* Answer in remaining cases depends on existance of
2005 * conflicting state; so we must wait out the grace period. */
2006 return nfserr_grace;
2007 } else if (flags & WR_STATE)
2008 return nfs4_share_conflict(current_fh,
2009 NFS4_SHARE_DENY_WRITE);
2010 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2011 return nfs4_share_conflict(current_fh,
2012 NFS4_SHARE_DENY_READ);
2016 * Allow READ/WRITE during grace period on recovered state only for files
2017 * that are not able to provide mandatory locking.
2020 grace_disallows_io(struct inode *inode)
2022 return locks_in_grace() && mandatory_lock(inode);
2025 static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2027 /* If the client sends us a stateid from the future, it's buggy: */
2028 if (in->si_generation > ref->si_generation)
2029 return nfserr_bad_stateid;
2031 * The following, however, can happen. For example, if the
2032 * client sends an open and some IO at the same time, the open
2033 * may bump si_generation while the IO is still in flight.
2034 * Thanks to hard links and renames, the client never knows what
2035 * file an open will affect. So it could avoid that situation
2036 * only by serializing all opens and IO from the same open
2037 * owner. To recover from the old_stateid error, the client
2038 * will just have to retry the IO:
2040 if (in->si_generation < ref->si_generation)
2041 return nfserr_old_stateid;
2045 static int is_delegation_stateid(stateid_t *stateid)
2047 return stateid->si_fileid == 0;
2051 * Checks for stateid operations
2054 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2056 struct nfs4_stateid *stp = NULL;
2057 struct nfs4_delegation *dp = NULL;
2058 struct inode *ino = current_fh->fh_dentry->d_inode;
2064 if (grace_disallows_io(ino))
2065 return nfserr_grace;
2067 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2068 return check_special_stateids(current_fh, stateid, flags);
2070 status = nfserr_stale_stateid;
2071 if (STALE_STATEID(stateid))
2074 status = nfserr_bad_stateid;
2075 if (is_delegation_stateid(stateid)) {
2076 dp = find_delegation_stateid(ino, stateid);
2079 status = check_stateid_generation(stateid, &dp->dl_stateid);
2082 status = nfs4_check_delegmode(dp, flags);
2085 renew_client(dp->dl_client);
2087 *filpp = dp->dl_vfs_file;
2088 } else { /* open or lock stateid */
2089 stp = find_stateid(stateid, flags);
2092 if (nfs4_check_fh(current_fh, stp))
2094 if (!stp->st_stateowner->so_confirmed)
2096 status = check_stateid_generation(stateid, &stp->st_stateid);
2099 status = nfs4_check_openmode(stp, flags);
2102 renew_client(stp->st_stateowner->so_client);
2104 *filpp = stp->st_vfs_file;
2114 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2115 RD_STATE : WR_STATE;
2119 * Checks for sequence id mutating operations.
2122 nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
2124 struct nfs4_stateid *stp;
2125 struct nfs4_stateowner *sop;
2128 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2129 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2130 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2131 stateid->si_generation);
2136 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2137 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2138 return nfserr_bad_stateid;
2141 if (STALE_STATEID(stateid))
2142 return nfserr_stale_stateid;
2144 * We return BAD_STATEID if filehandle doesn't match stateid,
2145 * the confirmed flag is incorrecly set, or the generation
2146 * number is incorrect.
2148 stp = find_stateid(stateid, flags);
2151 * Also, we should make sure this isn't just the result of
2154 sop = search_close_lru(stateid->si_stateownerid, flags);
2156 return nfserr_bad_stateid;
2162 *sopp = sop = stp->st_stateowner;
2165 clientid_t *lockclid = &lock->v.new.clientid;
2166 struct nfs4_client *clp = sop->so_client;
2170 lkflg = setlkflg(lock->lk_type);
2172 if (lock->lk_is_new) {
2173 if (!sop->so_is_open_owner)
2174 return nfserr_bad_stateid;
2175 if (!same_clid(&clp->cl_clientid, lockclid))
2176 return nfserr_bad_stateid;
2177 /* stp is the open stateid */
2178 status = nfs4_check_openmode(stp, lkflg);
2182 /* stp is the lock stateid */
2183 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2189 if (nfs4_check_fh(current_fh, stp)) {
2190 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2191 return nfserr_bad_stateid;
2195 * We now validate the seqid and stateid generation numbers.
2196 * For the moment, we ignore the possibility of
2197 * generation number wraparound.
2199 if (seqid != sop->so_seqid)
2202 if (sop->so_confirmed && flags & CONFIRM) {
2203 dprintk("NFSD: preprocess_seqid_op: expected"
2204 " unconfirmed stateowner!\n");
2205 return nfserr_bad_stateid;
2207 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2208 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2209 " confirmed yet!\n");
2210 return nfserr_bad_stateid;
2212 status = check_stateid_generation(stateid, &stp->st_stateid);
2215 renew_client(sop->so_client);
2219 if (seqid == sop->so_seqid - 1) {
2220 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2221 /* indicate replay to calling function */
2222 return nfserr_replay_me;
2224 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2225 sop->so_seqid, seqid);
2227 return nfserr_bad_seqid;
2231 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2232 struct nfsd4_open_confirm *oc)
2235 struct nfs4_stateowner *sop;
2236 struct nfs4_stateid *stp;
2238 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2239 (int)cstate->current_fh.fh_dentry->d_name.len,
2240 cstate->current_fh.fh_dentry->d_name.name);
2242 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2248 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2249 oc->oc_seqid, &oc->oc_req_stateid,
2250 CONFIRM | OPEN_STATE,
2251 &oc->oc_stateowner, &stp, NULL)))
2254 sop = oc->oc_stateowner;
2255 sop->so_confirmed = 1;
2256 update_stateid(&stp->st_stateid);
2257 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2258 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2259 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2260 stp->st_stateid.si_boot,
2261 stp->st_stateid.si_stateownerid,
2262 stp->st_stateid.si_fileid,
2263 stp->st_stateid.si_generation);
2265 nfsd4_create_clid_dir(sop->so_client);
2267 if (oc->oc_stateowner) {
2268 nfs4_get_stateowner(oc->oc_stateowner);
2269 cstate->replay_owner = oc->oc_stateowner;
2271 nfs4_unlock_state();
2277 * unset all bits in union bitmap (bmap) that
2278 * do not exist in share (from successful OPEN_DOWNGRADE)
2281 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2284 for (i = 1; i < 4; i++) {
2285 if ((i & access) != i)
2286 __clear_bit(i, bmap);
2291 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2294 for (i = 0; i < 4; i++) {
2295 if ((i & deny) != i)
2296 __clear_bit(i, bmap);
2301 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2302 struct nfsd4_compound_state *cstate,
2303 struct nfsd4_open_downgrade *od)
2306 struct nfs4_stateid *stp;
2307 unsigned int share_access;
2309 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2310 (int)cstate->current_fh.fh_dentry->d_name.len,
2311 cstate->current_fh.fh_dentry->d_name.name);
2313 if (!access_valid(od->od_share_access)
2314 || !deny_valid(od->od_share_deny))
2315 return nfserr_inval;
2318 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2322 &od->od_stateowner, &stp, NULL)))
2325 status = nfserr_inval;
2326 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2327 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2328 stp->st_access_bmap, od->od_share_access);
2331 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2332 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2333 stp->st_deny_bmap, od->od_share_deny);
2336 set_access(&share_access, stp->st_access_bmap);
2337 nfs4_file_downgrade(stp->st_vfs_file,
2338 share_access & ~od->od_share_access);
2340 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2341 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2343 update_stateid(&stp->st_stateid);
2344 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2347 if (od->od_stateowner) {
2348 nfs4_get_stateowner(od->od_stateowner);
2349 cstate->replay_owner = od->od_stateowner;
2351 nfs4_unlock_state();
2356 * nfs4_unlock_state() called after encode
2359 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2360 struct nfsd4_close *close)
2363 struct nfs4_stateid *stp;
2365 dprintk("NFSD: nfsd4_close on file %.*s\n",
2366 (int)cstate->current_fh.fh_dentry->d_name.len,
2367 cstate->current_fh.fh_dentry->d_name.name);
2370 /* check close_lru for replay */
2371 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2374 OPEN_STATE | CLOSE_STATE,
2375 &close->cl_stateowner, &stp, NULL)))
2378 update_stateid(&stp->st_stateid);
2379 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2381 /* release_stateid() calls nfsd_close() if needed */
2382 release_open_stateid(stp);
2384 /* place unused nfs4_stateowners on so_close_lru list to be
2385 * released by the laundromat service after the lease period
2386 * to enable us to handle CLOSE replay
2388 if (list_empty(&close->cl_stateowner->so_stateids))
2389 move_to_close_lru(close->cl_stateowner);
2391 if (close->cl_stateowner) {
2392 nfs4_get_stateowner(close->cl_stateowner);
2393 cstate->replay_owner = close->cl_stateowner;
2395 nfs4_unlock_state();
2400 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2401 struct nfsd4_delegreturn *dr)
2403 struct nfs4_delegation *dp;
2404 stateid_t *stateid = &dr->dr_stateid;
2405 struct inode *inode;
2408 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2410 inode = cstate->current_fh.fh_dentry->d_inode;
2413 status = nfserr_bad_stateid;
2414 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2416 status = nfserr_stale_stateid;
2417 if (STALE_STATEID(stateid))
2419 status = nfserr_bad_stateid;
2420 if (!is_delegation_stateid(stateid))
2422 dp = find_delegation_stateid(inode, stateid);
2425 status = check_stateid_generation(stateid, &dp->dl_stateid);
2428 renew_client(dp->dl_client);
2430 unhash_delegation(dp);
2432 nfs4_unlock_state();
2439 * Lock owner state (byte-range locks)
2441 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2442 #define LOCK_HASH_BITS 8
2443 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2444 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2447 end_offset(u64 start, u64 len)
2452 return end >= start ? end: NFS4_MAX_UINT64;
2455 /* last octet in a range */
2457 last_byte_offset(u64 start, u64 len)
2463 return end > start ? end - 1: NFS4_MAX_UINT64;
2466 #define lockownerid_hashval(id) \
2467 ((id) & LOCK_HASH_MASK)
2469 static inline unsigned int
2470 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2471 struct xdr_netobj *ownername)
2473 return (file_hashval(inode) + cl_id
2474 + opaque_hashval(ownername->data, ownername->len))
2478 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2479 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2480 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2482 static struct nfs4_stateid *
2483 find_stateid(stateid_t *stid, int flags)
2485 struct nfs4_stateid *local;
2486 u32 st_id = stid->si_stateownerid;
2487 u32 f_id = stid->si_fileid;
2488 unsigned int hashval;
2490 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2491 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
2492 hashval = stateid_hashval(st_id, f_id);
2493 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2494 if ((local->st_stateid.si_stateownerid == st_id) &&
2495 (local->st_stateid.si_fileid == f_id))
2500 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
2501 hashval = stateid_hashval(st_id, f_id);
2502 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2503 if ((local->st_stateid.si_stateownerid == st_id) &&
2504 (local->st_stateid.si_fileid == f_id))
2511 static struct nfs4_delegation *
2512 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2514 struct nfs4_file *fp;
2515 struct nfs4_delegation *dl;
2517 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2518 stid->si_boot, stid->si_stateownerid,
2519 stid->si_fileid, stid->si_generation);
2521 fp = find_file(ino);
2524 dl = find_delegation_file(fp, stid);
2530 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2531 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2532 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2533 * locking, this prevents us from being completely protocol-compliant. The
2534 * real solution to this problem is to start using unsigned file offsets in
2535 * the VFS, but this is a very deep change!
2538 nfs4_transform_lock_offset(struct file_lock *lock)
2540 if (lock->fl_start < 0)
2541 lock->fl_start = OFFSET_MAX;
2542 if (lock->fl_end < 0)
2543 lock->fl_end = OFFSET_MAX;
2546 /* Hack!: For now, we're defining this just so we can use a pointer to it
2547 * as a unique cookie to identify our (NFSv4's) posix locks. */
2548 static struct lock_manager_operations nfsd_posix_mng_ops = {
2552 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2554 struct nfs4_stateowner *sop;
2557 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2558 sop = (struct nfs4_stateowner *) fl->fl_owner;
2559 hval = lockownerid_hashval(sop->so_id);
2560 kref_get(&sop->so_ref);
2562 deny->ld_clientid = sop->so_client->cl_clientid;
2564 deny->ld_sop = NULL;
2565 deny->ld_clientid.cl_boot = 0;
2566 deny->ld_clientid.cl_id = 0;
2568 deny->ld_start = fl->fl_start;
2569 deny->ld_length = NFS4_MAX_UINT64;
2570 if (fl->fl_end != NFS4_MAX_UINT64)
2571 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2572 deny->ld_type = NFS4_READ_LT;
2573 if (fl->fl_type != F_RDLCK)
2574 deny->ld_type = NFS4_WRITE_LT;
2577 static struct nfs4_stateowner *
2578 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2579 struct xdr_netobj *owner)
2581 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2582 struct nfs4_stateowner *op;
2584 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2585 if (same_owner_str(op, owner, clid))
2592 * Alloc a lock owner structure.
2593 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2596 * strhashval = lock_ownerstr_hashval
2599 static struct nfs4_stateowner *
2600 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2601 struct nfs4_stateowner *sop;
2602 struct nfs4_replay *rp;
2603 unsigned int idhashval;
2605 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2607 idhashval = lockownerid_hashval(current_ownerid);
2608 INIT_LIST_HEAD(&sop->so_idhash);
2609 INIT_LIST_HEAD(&sop->so_strhash);
2610 INIT_LIST_HEAD(&sop->so_perclient);
2611 INIT_LIST_HEAD(&sop->so_stateids);
2612 INIT_LIST_HEAD(&sop->so_perstateid);
2613 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2615 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2616 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2617 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2618 sop->so_is_open_owner = 0;
2619 sop->so_id = current_ownerid++;
2620 sop->so_client = clp;
2621 /* It is the openowner seqid that will be incremented in encode in the
2622 * case of new lockowners; so increment the lock seqid manually: */
2623 sop->so_seqid = lock->lk_new_lock_seqid + 1;
2624 sop->so_confirmed = 1;
2625 rp = &sop->so_replay;
2626 rp->rp_status = nfserr_serverfault;
2628 rp->rp_buf = rp->rp_ibuf;
2632 static struct nfs4_stateid *
2633 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2635 struct nfs4_stateid *stp;
2636 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2638 stp = nfs4_alloc_stateid();
2641 INIT_LIST_HEAD(&stp->st_hash);
2642 INIT_LIST_HEAD(&stp->st_perfile);
2643 INIT_LIST_HEAD(&stp->st_perstateowner);
2644 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2645 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2646 list_add(&stp->st_perfile, &fp->fi_stateids);
2647 list_add(&stp->st_perstateowner, &sop->so_stateids);
2648 stp->st_stateowner = sop;
2651 stp->st_stateid.si_boot = boot_time;
2652 stp->st_stateid.si_stateownerid = sop->so_id;
2653 stp->st_stateid.si_fileid = fp->fi_id;
2654 stp->st_stateid.si_generation = 0;
2655 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2656 stp->st_access_bmap = open_stp->st_access_bmap;
2657 stp->st_deny_bmap = open_stp->st_deny_bmap;
2658 stp->st_openstp = open_stp;
2665 check_lock_length(u64 offset, u64 length)
2667 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
2668 LOFF_OVERFLOW(offset, length)));
2675 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2676 struct nfsd4_lock *lock)
2678 struct nfs4_stateowner *open_sop = NULL;
2679 struct nfs4_stateowner *lock_sop = NULL;
2680 struct nfs4_stateid *lock_stp;
2682 struct file_lock file_lock;
2683 struct file_lock conflock;
2685 unsigned int strhashval;
2689 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2690 (long long) lock->lk_offset,
2691 (long long) lock->lk_length);
2693 if (check_lock_length(lock->lk_offset, lock->lk_length))
2694 return nfserr_inval;
2696 if ((status = fh_verify(rqstp, &cstate->current_fh,
2697 S_IFREG, NFSD_MAY_LOCK))) {
2698 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2704 if (lock->lk_is_new) {
2706 * Client indicates that this is a new lockowner.
2707 * Use open owner and open stateid to create lock owner and
2710 struct nfs4_stateid *open_stp = NULL;
2711 struct nfs4_file *fp;
2713 status = nfserr_stale_clientid;
2714 if (STALE_CLIENTID(&lock->lk_new_clientid))
2717 /* validate and update open stateid and open seqid */
2718 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2719 lock->lk_new_open_seqid,
2720 &lock->lk_new_open_stateid,
2722 &lock->lk_replay_owner, &open_stp,
2726 open_sop = lock->lk_replay_owner;
2727 /* create lockowner and lock stateid */
2728 fp = open_stp->st_file;
2729 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2730 open_sop->so_client->cl_clientid.cl_id,
2731 &lock->v.new.owner);
2732 /* XXX: Do we need to check for duplicate stateowners on
2733 * the same file, or should they just be allowed (and
2734 * create new stateids)? */
2735 status = nfserr_resource;
2736 lock_sop = alloc_init_lock_stateowner(strhashval,
2737 open_sop->so_client, open_stp, lock);
2738 if (lock_sop == NULL)
2740 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2741 if (lock_stp == NULL)
2744 /* lock (lock owner + lock stateid) already exists */
2745 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2746 lock->lk_old_lock_seqid,
2747 &lock->lk_old_lock_stateid,
2749 &lock->lk_replay_owner, &lock_stp, lock);
2752 lock_sop = lock->lk_replay_owner;
2754 /* lock->lk_replay_owner and lock_stp have been created or found */
2755 filp = lock_stp->st_vfs_file;
2757 status = nfserr_grace;
2758 if (locks_in_grace() && !lock->lk_reclaim)
2760 status = nfserr_no_grace;
2761 if (!locks_in_grace() && lock->lk_reclaim)
2764 locks_init_lock(&file_lock);
2765 switch (lock->lk_type) {
2768 file_lock.fl_type = F_RDLCK;
2772 case NFS4_WRITEW_LT:
2773 file_lock.fl_type = F_WRLCK;
2777 status = nfserr_inval;
2780 file_lock.fl_owner = (fl_owner_t)lock_sop;
2781 file_lock.fl_pid = current->tgid;
2782 file_lock.fl_file = filp;
2783 file_lock.fl_flags = FL_POSIX;
2784 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2786 file_lock.fl_start = lock->lk_offset;
2787 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
2788 nfs4_transform_lock_offset(&file_lock);
2791 * Try to lock the file in the VFS.
2792 * Note: locks.c uses the BKL to protect the inode's lock list.
2795 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2797 case 0: /* success! */
2798 update_stateid(&lock_stp->st_stateid);
2799 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2803 case (EAGAIN): /* conflock holds conflicting lock */
2804 status = nfserr_denied;
2805 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2806 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2809 status = nfserr_deadlock;
2812 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2813 status = nfserr_resource;
2817 if (status && lock->lk_is_new && lock_sop)
2818 release_lockowner(lock_sop);
2819 if (lock->lk_replay_owner) {
2820 nfs4_get_stateowner(lock->lk_replay_owner);
2821 cstate->replay_owner = lock->lk_replay_owner;
2823 nfs4_unlock_state();
2828 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2829 * so we do a temporary open here just to get an open file to pass to
2830 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2833 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2838 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2841 err = vfs_test_lock(file, lock);
2850 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2851 struct nfsd4_lockt *lockt)
2853 struct inode *inode;
2854 struct file_lock file_lock;
2858 if (locks_in_grace())
2859 return nfserr_grace;
2861 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2862 return nfserr_inval;
2864 lockt->lt_stateowner = NULL;
2867 status = nfserr_stale_clientid;
2868 if (STALE_CLIENTID(&lockt->lt_clientid))
2871 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2872 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2873 if (status == nfserr_symlink)
2874 status = nfserr_inval;
2878 inode = cstate->current_fh.fh_dentry->d_inode;
2879 locks_init_lock(&file_lock);
2880 switch (lockt->lt_type) {
2883 file_lock.fl_type = F_RDLCK;
2886 case NFS4_WRITEW_LT:
2887 file_lock.fl_type = F_WRLCK;
2890 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2891 status = nfserr_inval;
2895 lockt->lt_stateowner = find_lockstateowner_str(inode,
2896 &lockt->lt_clientid, &lockt->lt_owner);
2897 if (lockt->lt_stateowner)
2898 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2899 file_lock.fl_pid = current->tgid;
2900 file_lock.fl_flags = FL_POSIX;
2902 file_lock.fl_start = lockt->lt_offset;
2903 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
2905 nfs4_transform_lock_offset(&file_lock);
2908 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
2910 status = nfserrno(error);
2913 if (file_lock.fl_type != F_UNLCK) {
2914 status = nfserr_denied;
2915 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2918 nfs4_unlock_state();
2923 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2924 struct nfsd4_locku *locku)
2926 struct nfs4_stateid *stp;
2927 struct file *filp = NULL;
2928 struct file_lock file_lock;
2932 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2933 (long long) locku->lu_offset,
2934 (long long) locku->lu_length);
2936 if (check_lock_length(locku->lu_offset, locku->lu_length))
2937 return nfserr_inval;
2941 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2945 &locku->lu_stateowner, &stp, NULL)))
2948 filp = stp->st_vfs_file;
2950 locks_init_lock(&file_lock);
2951 file_lock.fl_type = F_UNLCK;
2952 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2953 file_lock.fl_pid = current->tgid;
2954 file_lock.fl_file = filp;
2955 file_lock.fl_flags = FL_POSIX;
2956 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2957 file_lock.fl_start = locku->lu_offset;
2959 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
2960 nfs4_transform_lock_offset(&file_lock);
2963 * Try to unlock the file in the VFS.
2965 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2967 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2971 * OK, unlock succeeded; the only thing left to do is update the stateid.
2973 update_stateid(&stp->st_stateid);
2974 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2977 if (locku->lu_stateowner) {
2978 nfs4_get_stateowner(locku->lu_stateowner);
2979 cstate->replay_owner = locku->lu_stateowner;
2981 nfs4_unlock_state();
2985 status = nfserrno(err);
2991 * 1: locks held by lockowner
2992 * 0: no locks held by lockowner
2995 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2997 struct file_lock **flpp;
2998 struct inode *inode = filp->f_path.dentry->d_inode;
3002 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3003 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
3014 nfsd4_release_lockowner(struct svc_rqst *rqstp,
3015 struct nfsd4_compound_state *cstate,
3016 struct nfsd4_release_lockowner *rlockowner)
3018 clientid_t *clid = &rlockowner->rl_clientid;
3019 struct nfs4_stateowner *sop;
3020 struct nfs4_stateid *stp;
3021 struct xdr_netobj *owner = &rlockowner->rl_owner;
3022 struct list_head matches;
3026 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3027 clid->cl_boot, clid->cl_id);
3029 /* XXX check for lease expiration */
3031 status = nfserr_stale_clientid;
3032 if (STALE_CLIENTID(clid))
3037 status = nfserr_locks_held;
3038 /* XXX: we're doing a linear search through all the lockowners.
3039 * Yipes! For now we'll just hope clients aren't really using
3040 * release_lockowner much, but eventually we have to fix these
3041 * data structures. */
3042 INIT_LIST_HEAD(&matches);
3043 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3044 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3045 if (!same_owner_str(sop, owner, clid))
3047 list_for_each_entry(stp, &sop->so_stateids,
3049 if (check_for_locks(stp->st_vfs_file, sop))
3051 /* Note: so_perclient unused for lockowners,
3052 * so it's OK to fool with here. */
3053 list_add(&sop->so_perclient, &matches);
3057 /* Clients probably won't expect us to return with some (but not all)
3058 * of the lockowner state released; so don't release any until all
3059 * have been checked. */
3061 while (!list_empty(&matches)) {
3062 sop = list_entry(matches.next, struct nfs4_stateowner,
3064 /* unhash_stateowner deletes so_perclient only
3065 * for openowners. */
3066 list_del(&sop->so_perclient);
3067 release_lockowner(sop);
3070 nfs4_unlock_state();
3074 static inline struct nfs4_client_reclaim *
3077 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3081 nfs4_has_reclaimed_state(const char *name)
3083 unsigned int strhashval = clientstr_hashval(name);
3084 struct nfs4_client *clp;
3086 clp = find_confirmed_client_by_str(name, strhashval);
3091 * failure => all reset bets are off, nfserr_no_grace...
3094 nfs4_client_to_reclaim(const char *name)
3096 unsigned int strhashval;
3097 struct nfs4_client_reclaim *crp = NULL;
3099 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3100 crp = alloc_reclaim();
3103 strhashval = clientstr_hashval(name);
3104 INIT_LIST_HEAD(&crp->cr_strhash);
3105 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3106 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3107 reclaim_str_hashtbl_size++;
3112 nfs4_release_reclaim(void)
3114 struct nfs4_client_reclaim *crp = NULL;
3117 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3118 while (!list_empty(&reclaim_str_hashtbl[i])) {
3119 crp = list_entry(reclaim_str_hashtbl[i].next,
3120 struct nfs4_client_reclaim, cr_strhash);
3121 list_del(&crp->cr_strhash);
3123 reclaim_str_hashtbl_size--;
3126 BUG_ON(reclaim_str_hashtbl_size);
3130 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3131 static struct nfs4_client_reclaim *
3132 nfs4_find_reclaim_client(clientid_t *clid)
3134 unsigned int strhashval;
3135 struct nfs4_client *clp;
3136 struct nfs4_client_reclaim *crp = NULL;
3139 /* find clientid in conf_id_hashtbl */
3140 clp = find_confirmed_client(clid);
3144 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3145 clp->cl_name.len, clp->cl_name.data,
3148 /* find clp->cl_name in reclaim_str_hashtbl */
3149 strhashval = clientstr_hashval(clp->cl_recdir);
3150 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3151 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3159 * Called from OPEN. Look for clientid in reclaim list.
3162 nfs4_check_open_reclaim(clientid_t *clid)
3164 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3167 /* initialization to perform at module load time: */
3170 nfs4_state_init(void)
3174 status = nfsd4_init_slabs();
3177 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3178 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3179 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3180 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3181 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3183 for (i = 0; i < FILE_HASH_SIZE; i++) {
3184 INIT_LIST_HEAD(&file_hashtbl[i]);
3186 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3187 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3188 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3190 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3191 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3192 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3194 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3195 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3196 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3198 memset(&onestateid, ~0, sizeof(stateid_t));
3199 INIT_LIST_HEAD(&close_lru);
3200 INIT_LIST_HEAD(&client_lru);
3201 INIT_LIST_HEAD(&del_recall_lru);
3202 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3203 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3204 reclaim_str_hashtbl_size = 0;
3209 nfsd4_load_reboot_recovery_data(void)
3214 nfsd4_init_recdir(user_recovery_dirname);
3215 status = nfsd4_recdir_load();
3216 nfs4_unlock_state();
3218 printk("NFSD: Failure reading reboot recovery data\n");
3222 get_nfs4_grace_period(void)
3224 return max(user_lease_time, lease_time) * HZ;
3228 * Since the lifetime of a delegation isn't limited to that of an open, a
3229 * client may quite reasonably hang on to a delegation as long as it has
3230 * the inode cached. This becomes an obvious problem the first time a
3231 * client's inode cache approaches the size of the server's total memory.
3233 * For now we avoid this problem by imposing a hard limit on the number
3234 * of delegations, which varies according to the server's memory size.
3237 set_max_delegations(void)
3240 * Allow at most 4 delegations per megabyte of RAM. Quick
3241 * estimates suggest that in the worst case (where every delegation
3242 * is for a different inode), a delegation could take about 1.5K,
3243 * giving a worst case usage of about 6% of memory.
3245 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3248 /* initialization to perform when the nfsd service is started: */
3251 __nfs4_state_start(void)
3253 unsigned long grace_time;
3255 boot_time = get_seconds();
3256 grace_time = get_nfs4_grace_period();
3257 lease_time = user_lease_time;
3258 locks_start_grace(&nfsd4_manager);
3259 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3261 laundry_wq = create_singlethread_workqueue("nfsd4");
3262 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3263 set_max_delegations();
3267 nfs4_state_start(void)
3271 nfsd4_load_reboot_recovery_data();
3272 __nfs4_state_start();
3278 nfs4_lease_time(void)
3284 __nfs4_state_shutdown(void)
3287 struct nfs4_client *clp = NULL;
3288 struct nfs4_delegation *dp = NULL;
3289 struct list_head *pos, *next, reaplist;
3291 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3292 while (!list_empty(&conf_id_hashtbl[i])) {
3293 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3296 while (!list_empty(&unconf_str_hashtbl[i])) {
3297 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3301 INIT_LIST_HEAD(&reaplist);
3302 spin_lock(&recall_lock);
3303 list_for_each_safe(pos, next, &del_recall_lru) {
3304 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3305 list_move(&dp->dl_recall_lru, &reaplist);
3307 spin_unlock(&recall_lock);
3308 list_for_each_safe(pos, next, &reaplist) {
3309 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3310 list_del_init(&dp->dl_recall_lru);
3311 unhash_delegation(dp);
3314 nfsd4_shutdown_recdir();
3319 nfs4_state_shutdown(void)
3321 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3322 destroy_workqueue(laundry_wq);
3323 locks_end_grace(&nfsd4_manager);
3325 nfs4_release_reclaim();
3326 __nfs4_state_shutdown();
3327 nfs4_unlock_state();
3331 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3332 * accessed when nfsd is starting.
3335 nfs4_set_recdir(char *recdir)
3337 strcpy(user_recovery_dirname, recdir);
3341 * Change the NFSv4 recovery directory to recdir.
3344 nfs4_reset_recoverydir(char *recdir)
3349 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
3353 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
3354 nfs4_set_recdir(recdir);
3362 nfs4_recoverydir(void)
3364 return user_recovery_dirname;
3368 * Called when leasetime is changed.
3370 * The only way the protocol gives us to handle on-the-fly lease changes is to
3371 * simulate a reboot. Instead of doing that, we just wait till the next time
3372 * we start to register any changes in lease time. If the administrator
3373 * really wants to change the lease time *now*, they can go ahead and bring
3374 * nfsd down and then back up again after changing the lease time.
3376 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3377 * when nfsd is starting
3380 nfs4_reset_lease(time_t leasetime)
3382 user_lease_time = leasetime;