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);
84 * protects clientid_hashtbl[], clientstr_hashtbl[],
85 * unconfstr_hashtbl[], uncofid_hashtbl[].
87 static DEFINE_MUTEX(client_mutex);
89 static struct kmem_cache *stateowner_slab = NULL;
90 static struct kmem_cache *file_slab = NULL;
91 static struct kmem_cache *stateid_slab = NULL;
92 static struct kmem_cache *deleg_slab = NULL;
97 mutex_lock(&client_mutex);
101 nfs4_unlock_state(void)
103 mutex_unlock(&client_mutex);
107 opaque_hashval(const void *ptr, int nbytes)
109 unsigned char *cptr = (unsigned char *) ptr;
123 /* recall_lock protects the del_recall_lru */
124 static DEFINE_SPINLOCK(recall_lock);
125 static struct list_head del_recall_lru;
128 free_nfs4_file(struct kref *kref)
130 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
131 list_del(&fp->fi_hash);
133 kmem_cache_free(file_slab, fp);
137 put_nfs4_file(struct nfs4_file *fi)
139 kref_put(&fi->fi_ref, free_nfs4_file);
143 get_nfs4_file(struct nfs4_file *fi)
145 kref_get(&fi->fi_ref);
148 static int num_delegations;
149 unsigned int max_delegations;
152 * Open owner state (share locks)
155 /* hash tables for nfs4_stateowner */
156 #define OWNER_HASH_BITS 8
157 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
158 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
160 #define ownerid_hashval(id) \
161 ((id) & OWNER_HASH_MASK)
162 #define ownerstr_hashval(clientid, ownername) \
163 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
165 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
166 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
168 /* hash table for nfs4_file */
169 #define FILE_HASH_BITS 8
170 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
171 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
172 /* hash table for (open)nfs4_stateid */
173 #define STATEID_HASH_BITS 10
174 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
175 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
177 #define file_hashval(x) \
178 hash_ptr(x, FILE_HASH_BITS)
179 #define stateid_hashval(owner_id, file_id) \
180 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
182 static struct list_head file_hashtbl[FILE_HASH_SIZE];
183 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
185 static struct nfs4_delegation *
186 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
188 struct nfs4_delegation *dp;
189 struct nfs4_file *fp = stp->st_file;
190 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
192 dprintk("NFSD alloc_init_deleg\n");
193 if (fp->fi_had_conflict)
195 if (num_delegations > max_delegations)
197 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
201 INIT_LIST_HEAD(&dp->dl_perfile);
202 INIT_LIST_HEAD(&dp->dl_perclnt);
203 INIT_LIST_HEAD(&dp->dl_recall_lru);
208 get_file(stp->st_vfs_file);
209 dp->dl_vfs_file = stp->st_vfs_file;
211 dp->dl_recall.cbr_dp = NULL;
212 dp->dl_recall.cbr_ident = cb->cb_ident;
213 dp->dl_recall.cbr_trunc = 0;
214 dp->dl_stateid.si_boot = boot_time;
215 dp->dl_stateid.si_stateownerid = current_delegid++;
216 dp->dl_stateid.si_fileid = 0;
217 dp->dl_stateid.si_generation = 0;
218 dp->dl_fhlen = current_fh->fh_handle.fh_size;
219 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base,
220 current_fh->fh_handle.fh_size);
222 atomic_set(&dp->dl_count, 1);
223 list_add(&dp->dl_perfile, &fp->fi_delegations);
224 list_add(&dp->dl_perclnt, &clp->cl_delegations);
229 nfs4_put_delegation(struct nfs4_delegation *dp)
231 if (atomic_dec_and_test(&dp->dl_count)) {
232 dprintk("NFSD: freeing dp %p\n",dp);
233 put_nfs4_file(dp->dl_file);
234 kmem_cache_free(deleg_slab, dp);
239 /* Remove the associated file_lock first, then remove the delegation.
240 * lease_modify() is called to remove the FS_LEASE file_lock from
241 * the i_flock list, eventually calling nfsd's lock_manager
242 * fl_release_callback.
245 nfs4_close_delegation(struct nfs4_delegation *dp)
247 struct file *filp = dp->dl_vfs_file;
249 dprintk("NFSD: close_delegation dp %p\n",dp);
250 dp->dl_vfs_file = NULL;
251 /* The following nfsd_close may not actually close the file,
252 * but we want to remove the lease in any case. */
254 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
258 /* Called under the state lock. */
260 unhash_delegation(struct nfs4_delegation *dp)
262 list_del_init(&dp->dl_perfile);
263 list_del_init(&dp->dl_perclnt);
264 spin_lock(&recall_lock);
265 list_del_init(&dp->dl_recall_lru);
266 spin_unlock(&recall_lock);
267 nfs4_close_delegation(dp);
268 nfs4_put_delegation(dp);
275 /* Hash tables for nfs4_clientid state */
276 #define CLIENT_HASH_BITS 4
277 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
278 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
280 #define clientid_hashval(id) \
281 ((id) & CLIENT_HASH_MASK)
282 #define clientstr_hashval(name) \
283 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
285 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
286 * used in reboot/reset lease grace period processing
288 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
289 * setclientid_confirmed info.
291 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
294 * client_lru holds client queue ordered by nfs4_client.cl_time
297 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
298 * for last close replay.
300 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
301 static int reclaim_str_hashtbl_size = 0;
302 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
303 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
304 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
305 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
306 static struct list_head client_lru;
307 static struct list_head close_lru;
309 static void unhash_generic_stateid(struct nfs4_stateid *stp)
311 list_del(&stp->st_hash);
312 list_del(&stp->st_perfile);
313 list_del(&stp->st_perstateowner);
316 static void free_generic_stateid(struct nfs4_stateid *stp)
318 put_nfs4_file(stp->st_file);
319 kmem_cache_free(stateid_slab, stp);
322 static void release_lock_stateid(struct nfs4_stateid *stp)
324 unhash_generic_stateid(stp);
325 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
326 free_generic_stateid(stp);
329 static void unhash_lockowner(struct nfs4_stateowner *sop)
331 struct nfs4_stateid *stp;
333 list_del(&sop->so_idhash);
334 list_del(&sop->so_strhash);
335 list_del(&sop->so_perstateid);
336 while (!list_empty(&sop->so_stateids)) {
337 stp = list_first_entry(&sop->so_stateids,
338 struct nfs4_stateid, st_perstateowner);
339 release_lock_stateid(stp);
343 static void release_lockowner(struct nfs4_stateowner *sop)
345 unhash_lockowner(sop);
346 nfs4_put_stateowner(sop);
350 release_stateid_lockowners(struct nfs4_stateid *open_stp)
352 struct nfs4_stateowner *lock_sop;
354 while (!list_empty(&open_stp->st_lockowners)) {
355 lock_sop = list_entry(open_stp->st_lockowners.next,
356 struct nfs4_stateowner, so_perstateid);
357 /* list_del(&open_stp->st_lockowners); */
358 BUG_ON(lock_sop->so_is_open_owner);
359 release_lockowner(lock_sop);
363 static void release_open_stateid(struct nfs4_stateid *stp)
365 unhash_generic_stateid(stp);
366 release_stateid_lockowners(stp);
367 nfsd_close(stp->st_vfs_file);
368 free_generic_stateid(stp);
371 static void unhash_openowner(struct nfs4_stateowner *sop)
373 struct nfs4_stateid *stp;
375 list_del(&sop->so_idhash);
376 list_del(&sop->so_strhash);
377 list_del(&sop->so_perclient);
378 list_del(&sop->so_perstateid); /* XXX: necessary? */
379 while (!list_empty(&sop->so_stateids)) {
380 stp = list_first_entry(&sop->so_stateids,
381 struct nfs4_stateid, st_perstateowner);
382 release_open_stateid(stp);
386 static void release_openowner(struct nfs4_stateowner *sop)
388 unhash_openowner(sop);
389 list_del(&sop->so_close_lru);
390 nfs4_put_stateowner(sop);
394 renew_client(struct nfs4_client *clp)
397 * Move client to the end to the LRU list.
399 dprintk("renewing client (clientid %08x/%08x)\n",
400 clp->cl_clientid.cl_boot,
401 clp->cl_clientid.cl_id);
402 list_move_tail(&clp->cl_lru, &client_lru);
403 clp->cl_time = get_seconds();
406 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
408 STALE_CLIENTID(clientid_t *clid)
410 if (clid->cl_boot == boot_time)
412 dprintk("NFSD stale clientid (%08x/%08x)\n",
413 clid->cl_boot, clid->cl_id);
418 * XXX Should we use a slab cache ?
419 * This type of memory management is somewhat inefficient, but we use it
420 * anyway since SETCLIENTID is not a common operation.
422 static struct nfs4_client *alloc_client(struct xdr_netobj name)
424 struct nfs4_client *clp;
426 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
429 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
430 if (clp->cl_name.data == NULL) {
434 memcpy(clp->cl_name.data, name.data, name.len);
435 clp->cl_name.len = name.len;
440 shutdown_callback_client(struct nfs4_client *clp)
442 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
446 * Callback threads take a reference on the client, so there
447 * should be no outstanding callbacks at this point.
449 clp->cl_callback.cb_client = NULL;
450 rpc_shutdown_client(clnt);
455 free_client(struct nfs4_client *clp)
457 shutdown_callback_client(clp);
458 if (clp->cl_cred.cr_group_info)
459 put_group_info(clp->cl_cred.cr_group_info);
460 kfree(clp->cl_principal);
461 kfree(clp->cl_name.data);
466 put_nfs4_client(struct nfs4_client *clp)
468 if (atomic_dec_and_test(&clp->cl_count))
473 expire_client(struct nfs4_client *clp)
475 struct nfs4_stateowner *sop;
476 struct nfs4_delegation *dp;
477 struct list_head reaplist;
479 dprintk("NFSD: expire_client cl_count %d\n",
480 atomic_read(&clp->cl_count));
482 INIT_LIST_HEAD(&reaplist);
483 spin_lock(&recall_lock);
484 while (!list_empty(&clp->cl_delegations)) {
485 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
486 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
488 list_del_init(&dp->dl_perclnt);
489 list_move(&dp->dl_recall_lru, &reaplist);
491 spin_unlock(&recall_lock);
492 while (!list_empty(&reaplist)) {
493 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
494 list_del_init(&dp->dl_recall_lru);
495 unhash_delegation(dp);
497 list_del(&clp->cl_idhash);
498 list_del(&clp->cl_strhash);
499 list_del(&clp->cl_lru);
500 while (!list_empty(&clp->cl_openowners)) {
501 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
502 release_openowner(sop);
504 put_nfs4_client(clp);
507 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
509 struct nfs4_client *clp;
511 clp = alloc_client(name);
514 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
515 atomic_set(&clp->cl_count, 1);
516 atomic_set(&clp->cl_callback.cb_set, 0);
517 INIT_LIST_HEAD(&clp->cl_idhash);
518 INIT_LIST_HEAD(&clp->cl_strhash);
519 INIT_LIST_HEAD(&clp->cl_openowners);
520 INIT_LIST_HEAD(&clp->cl_delegations);
521 INIT_LIST_HEAD(&clp->cl_lru);
525 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
527 memcpy(target->cl_verifier.data, source->data,
528 sizeof(target->cl_verifier.data));
531 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
533 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
534 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
537 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
539 target->cr_uid = source->cr_uid;
540 target->cr_gid = source->cr_gid;
541 target->cr_group_info = source->cr_group_info;
542 get_group_info(target->cr_group_info);
545 static int same_name(const char *n1, const char *n2)
547 return 0 == memcmp(n1, n2, HEXDIR_LEN);
551 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
553 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
557 same_clid(clientid_t *cl1, clientid_t *cl2)
559 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
562 /* XXX what about NGROUP */
564 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
566 return cr1->cr_uid == cr2->cr_uid;
569 static void gen_clid(struct nfs4_client *clp)
571 static u32 current_clientid = 1;
573 clp->cl_clientid.cl_boot = boot_time;
574 clp->cl_clientid.cl_id = current_clientid++;
577 static void gen_confirm(struct nfs4_client *clp)
582 p = (u32 *)clp->cl_confirm.data;
583 *p++ = get_seconds();
587 static int check_name(struct xdr_netobj name)
591 if (name.len > NFS4_OPAQUE_LIMIT) {
592 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
599 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
601 unsigned int idhashval;
603 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
604 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
605 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
606 list_add_tail(&clp->cl_lru, &client_lru);
607 clp->cl_time = get_seconds();
611 move_to_confirmed(struct nfs4_client *clp)
613 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
614 unsigned int strhashval;
616 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
617 list_del_init(&clp->cl_strhash);
618 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
619 strhashval = clientstr_hashval(clp->cl_recdir);
620 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
624 static struct nfs4_client *
625 find_confirmed_client(clientid_t *clid)
627 struct nfs4_client *clp;
628 unsigned int idhashval = clientid_hashval(clid->cl_id);
630 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
631 if (same_clid(&clp->cl_clientid, clid))
637 static struct nfs4_client *
638 find_unconfirmed_client(clientid_t *clid)
640 struct nfs4_client *clp;
641 unsigned int idhashval = clientid_hashval(clid->cl_id);
643 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
644 if (same_clid(&clp->cl_clientid, clid))
650 static struct nfs4_client *
651 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
653 struct nfs4_client *clp;
655 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
656 if (same_name(clp->cl_recdir, dname))
662 static struct nfs4_client *
663 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
665 struct nfs4_client *clp;
667 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
668 if (same_name(clp->cl_recdir, dname))
674 /* a helper function for parse_callback */
676 parse_octet(unsigned int *lenp, char **addrp)
678 unsigned int len = *lenp;
690 if ((c < '0') || (c > '9')) {
696 n = (n * 10) + (c - '0');
707 /* parse and set the setclientid ipv4 callback address */
709 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
714 u32 addrlen = addr_len;
715 char *addr = addr_val;
720 for(i = 4; i > 0 ; i--) {
721 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
724 cbaddr |= (temp << shift);
732 for(i = 2; i > 0 ; i--) {
733 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
736 cbport |= (temp << shift);
745 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
747 struct nfs4_callback *cb = &clp->cl_callback;
749 /* Currently, we only support tcp for the callback channel */
750 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
753 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
754 &cb->cb_addr, &cb->cb_port)))
756 cb->cb_prog = se->se_callback_prog;
757 cb->cb_ident = se->se_callback_ident;
760 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
761 "will not receive delegations\n",
762 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
768 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
769 struct nfsd4_setclientid *setclid)
771 struct sockaddr_in *sin = svc_addr_in(rqstp);
772 struct xdr_netobj clname = {
773 .len = setclid->se_namelen,
774 .data = setclid->se_name,
776 nfs4_verifier clverifier = setclid->se_verf;
777 unsigned int strhashval;
778 struct nfs4_client *conf, *unconf, *new;
781 char dname[HEXDIR_LEN];
783 if (!check_name(clname))
786 status = nfs4_make_rec_clidname(dname, &clname);
791 * XXX The Duplicate Request Cache (DRC) has been checked (??)
792 * We get here on a DRC miss.
795 strhashval = clientstr_hashval(dname);
798 conf = find_confirmed_client_by_str(dname, strhashval);
800 /* RFC 3530 14.2.33 CASE 0: */
801 status = nfserr_clid_inuse;
802 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
803 || conf->cl_addr != sin->sin_addr.s_addr) {
804 dprintk("NFSD: setclientid: string in use by clientat %pI4\n",
810 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
811 * has a description of SETCLIENTID request processing consisting
812 * of 5 bullet points, labeled as CASE0 - CASE4 below.
814 unconf = find_unconfirmed_client_by_str(dname, strhashval);
815 status = nfserr_resource;
818 * RFC 3530 14.2.33 CASE 4:
819 * placed first, because it is the normal case
822 expire_client(unconf);
823 new = create_client(clname, dname);
827 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
829 * RFC 3530 14.2.33 CASE 1:
830 * probable callback update
833 /* Note this is removing unconfirmed {*x***},
834 * which is stronger than RFC recommended {vxc**}.
835 * This has the advantage that there is at most
836 * one {*x***} in either list at any time.
838 expire_client(unconf);
840 new = create_client(clname, dname);
843 copy_clid(new, conf);
844 } else if (!unconf) {
846 * RFC 3530 14.2.33 CASE 2:
847 * probable client reboot; state will be removed if
850 new = create_client(clname, dname);
856 * RFC 3530 14.2.33 CASE 3:
857 * probable client reboot; state will be removed if
860 expire_client(unconf);
861 new = create_client(clname, dname);
866 copy_verf(new, &clverifier);
867 new->cl_addr = sin->sin_addr.s_addr;
868 new->cl_flavor = rqstp->rq_flavor;
869 princ = svc_gss_principal(rqstp);
871 new->cl_principal = kstrdup(princ, GFP_KERNEL);
872 if (new->cl_principal == NULL) {
877 copy_cred(&new->cl_cred, &rqstp->rq_cred);
879 gen_callback(new, setclid);
880 add_to_unconfirmed(new, strhashval);
881 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
882 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
883 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
892 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
893 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
894 * bullets, labeled as CASE1 - CASE4 below.
897 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
898 struct nfsd4_compound_state *cstate,
899 struct nfsd4_setclientid_confirm *setclientid_confirm)
901 struct sockaddr_in *sin = svc_addr_in(rqstp);
902 struct nfs4_client *conf, *unconf;
903 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
904 clientid_t * clid = &setclientid_confirm->sc_clientid;
907 if (STALE_CLIENTID(clid))
908 return nfserr_stale_clientid;
910 * XXX The Duplicate Request Cache (DRC) has been checked (??)
911 * We get here on a DRC miss.
916 conf = find_confirmed_client(clid);
917 unconf = find_unconfirmed_client(clid);
919 status = nfserr_clid_inuse;
920 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
922 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
926 * section 14.2.34 of RFC 3530 has a description of
927 * SETCLIENTID_CONFIRM request processing consisting
928 * of 4 bullet points, labeled as CASE1 - CASE4 below.
930 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
932 * RFC 3530 14.2.34 CASE 1:
935 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
936 status = nfserr_clid_inuse;
938 /* XXX: We just turn off callbacks until we can handle
939 * change request correctly. */
940 atomic_set(&conf->cl_callback.cb_set, 0);
942 nfsd4_remove_clid_dir(unconf);
943 expire_client(unconf);
947 } else if (conf && !unconf) {
949 * RFC 3530 14.2.34 CASE 2:
950 * probable retransmitted request; play it safe and
953 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
954 status = nfserr_clid_inuse;
957 } else if (!conf && unconf
958 && same_verf(&unconf->cl_confirm, &confirm)) {
960 * RFC 3530 14.2.34 CASE 3:
961 * Normal case; new or rebooted client:
963 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
964 status = nfserr_clid_inuse;
967 clientstr_hashval(unconf->cl_recdir);
968 conf = find_confirmed_client_by_str(unconf->cl_recdir,
971 nfsd4_remove_clid_dir(conf);
974 move_to_confirmed(unconf);
976 nfsd4_probe_callback(conf);
979 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
980 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
983 * RFC 3530 14.2.34 CASE 4:
984 * Client probably hasn't noticed that we rebooted yet.
986 status = nfserr_stale_clientid;
988 /* check that we have hit one of the cases...*/
989 status = nfserr_clid_inuse;
996 /* OPEN Share state helper functions */
997 static inline struct nfs4_file *
998 alloc_init_file(struct inode *ino)
1000 struct nfs4_file *fp;
1001 unsigned int hashval = file_hashval(ino);
1003 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1005 kref_init(&fp->fi_ref);
1006 INIT_LIST_HEAD(&fp->fi_hash);
1007 INIT_LIST_HEAD(&fp->fi_stateids);
1008 INIT_LIST_HEAD(&fp->fi_delegations);
1009 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1010 fp->fi_inode = igrab(ino);
1011 fp->fi_id = current_fileid++;
1012 fp->fi_had_conflict = false;
1019 nfsd4_free_slab(struct kmem_cache **slab)
1023 kmem_cache_destroy(*slab);
1028 nfsd4_free_slabs(void)
1030 nfsd4_free_slab(&stateowner_slab);
1031 nfsd4_free_slab(&file_slab);
1032 nfsd4_free_slab(&stateid_slab);
1033 nfsd4_free_slab(&deleg_slab);
1037 nfsd4_init_slabs(void)
1039 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1040 sizeof(struct nfs4_stateowner), 0, 0, NULL);
1041 if (stateowner_slab == NULL)
1043 file_slab = kmem_cache_create("nfsd4_files",
1044 sizeof(struct nfs4_file), 0, 0, NULL);
1045 if (file_slab == NULL)
1047 stateid_slab = kmem_cache_create("nfsd4_stateids",
1048 sizeof(struct nfs4_stateid), 0, 0, NULL);
1049 if (stateid_slab == NULL)
1051 deleg_slab = kmem_cache_create("nfsd4_delegations",
1052 sizeof(struct nfs4_delegation), 0, 0, NULL);
1053 if (deleg_slab == NULL)
1058 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1063 nfs4_free_stateowner(struct kref *kref)
1065 struct nfs4_stateowner *sop =
1066 container_of(kref, struct nfs4_stateowner, so_ref);
1067 kfree(sop->so_owner.data);
1068 kmem_cache_free(stateowner_slab, sop);
1071 static inline struct nfs4_stateowner *
1072 alloc_stateowner(struct xdr_netobj *owner)
1074 struct nfs4_stateowner *sop;
1076 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1077 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1078 memcpy(sop->so_owner.data, owner->data, owner->len);
1079 sop->so_owner.len = owner->len;
1080 kref_init(&sop->so_ref);
1083 kmem_cache_free(stateowner_slab, sop);
1088 static struct nfs4_stateowner *
1089 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1090 struct nfs4_stateowner *sop;
1091 struct nfs4_replay *rp;
1092 unsigned int idhashval;
1094 if (!(sop = alloc_stateowner(&open->op_owner)))
1096 idhashval = ownerid_hashval(current_ownerid);
1097 INIT_LIST_HEAD(&sop->so_idhash);
1098 INIT_LIST_HEAD(&sop->so_strhash);
1099 INIT_LIST_HEAD(&sop->so_perclient);
1100 INIT_LIST_HEAD(&sop->so_stateids);
1101 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1102 INIT_LIST_HEAD(&sop->so_close_lru);
1104 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1105 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1106 list_add(&sop->so_perclient, &clp->cl_openowners);
1107 sop->so_is_open_owner = 1;
1108 sop->so_id = current_ownerid++;
1109 sop->so_client = clp;
1110 sop->so_seqid = open->op_seqid;
1111 sop->so_confirmed = 0;
1112 rp = &sop->so_replay;
1113 rp->rp_status = nfserr_serverfault;
1115 rp->rp_buf = rp->rp_ibuf;
1120 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1121 struct nfs4_stateowner *sop = open->op_stateowner;
1122 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1124 INIT_LIST_HEAD(&stp->st_hash);
1125 INIT_LIST_HEAD(&stp->st_perstateowner);
1126 INIT_LIST_HEAD(&stp->st_lockowners);
1127 INIT_LIST_HEAD(&stp->st_perfile);
1128 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1129 list_add(&stp->st_perstateowner, &sop->so_stateids);
1130 list_add(&stp->st_perfile, &fp->fi_stateids);
1131 stp->st_stateowner = sop;
1134 stp->st_stateid.si_boot = boot_time;
1135 stp->st_stateid.si_stateownerid = sop->so_id;
1136 stp->st_stateid.si_fileid = fp->fi_id;
1137 stp->st_stateid.si_generation = 0;
1138 stp->st_access_bmap = 0;
1139 stp->st_deny_bmap = 0;
1140 __set_bit(open->op_share_access, &stp->st_access_bmap);
1141 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1142 stp->st_openstp = NULL;
1146 move_to_close_lru(struct nfs4_stateowner *sop)
1148 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1150 list_move_tail(&sop->so_close_lru, &close_lru);
1151 sop->so_time = get_seconds();
1155 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1158 return (sop->so_owner.len == owner->len) &&
1159 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1160 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1163 static struct nfs4_stateowner *
1164 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1166 struct nfs4_stateowner *so = NULL;
1168 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1169 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1175 /* search file_hashtbl[] for file */
1176 static struct nfs4_file *
1177 find_file(struct inode *ino)
1179 unsigned int hashval = file_hashval(ino);
1180 struct nfs4_file *fp;
1182 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1183 if (fp->fi_inode == ino) {
1191 static inline int access_valid(u32 x)
1193 if (x < NFS4_SHARE_ACCESS_READ)
1195 if (x > NFS4_SHARE_ACCESS_BOTH)
1200 static inline int deny_valid(u32 x)
1202 /* Note: unlike access bits, deny bits may be zero. */
1203 return x <= NFS4_SHARE_DENY_BOTH;
1207 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1208 * st_{access,deny}_bmap field of the stateid, in order to track not
1209 * only what share bits are currently in force, but also what
1210 * combinations of share bits previous opens have used. This allows us
1211 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1212 * return an error if the client attempt to downgrade to a combination
1213 * of share bits not explicable by closing some of its previous opens.
1215 * XXX: This enforcement is actually incomplete, since we don't keep
1216 * track of access/deny bit combinations; so, e.g., we allow:
1218 * OPEN allow read, deny write
1219 * OPEN allow both, deny none
1220 * DOWNGRADE allow read, deny none
1222 * which we should reject.
1225 set_access(unsigned int *access, unsigned long bmap) {
1229 for (i = 1; i < 4; i++) {
1230 if (test_bit(i, &bmap))
1236 set_deny(unsigned int *deny, unsigned long bmap) {
1240 for (i = 0; i < 4; i++) {
1241 if (test_bit(i, &bmap))
1247 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1248 unsigned int access, deny;
1250 set_access(&access, stp->st_access_bmap);
1251 set_deny(&deny, stp->st_deny_bmap);
1252 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1258 * Called to check deny when READ with all zero stateid or
1259 * WRITE with all zero or all one stateid
1262 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1264 struct inode *ino = current_fh->fh_dentry->d_inode;
1265 struct nfs4_file *fp;
1266 struct nfs4_stateid *stp;
1269 dprintk("NFSD: nfs4_share_conflict\n");
1271 fp = find_file(ino);
1274 ret = nfserr_locked;
1275 /* Search for conflicting share reservations */
1276 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1277 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1278 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1288 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1290 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1291 drop_file_write_access(filp);
1292 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1297 * Recall a delegation
1300 do_recall(void *__dp)
1302 struct nfs4_delegation *dp = __dp;
1304 dp->dl_file->fi_had_conflict = true;
1305 nfsd4_cb_recall(dp);
1310 * Spawn a thread to perform a recall on the delegation represented
1311 * by the lease (file_lock)
1313 * Called from break_lease() with lock_kernel() held.
1314 * Note: we assume break_lease will only call this *once* for any given
1318 void nfsd_break_deleg_cb(struct file_lock *fl)
1320 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1321 struct task_struct *t;
1323 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1327 /* We're assuming the state code never drops its reference
1328 * without first removing the lease. Since we're in this lease
1329 * callback (and since the lease code is serialized by the kernel
1330 * lock) we know the server hasn't removed the lease yet, we know
1331 * it's safe to take a reference: */
1332 atomic_inc(&dp->dl_count);
1333 atomic_inc(&dp->dl_client->cl_count);
1335 spin_lock(&recall_lock);
1336 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1337 spin_unlock(&recall_lock);
1339 /* only place dl_time is set. protected by lock_kernel*/
1340 dp->dl_time = get_seconds();
1343 * We don't want the locks code to timeout the lease for us;
1344 * we'll remove it ourself if the delegation isn't returned
1347 fl->fl_break_time = 0;
1349 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1351 struct nfs4_client *clp = dp->dl_client;
1353 printk(KERN_INFO "NFSD: Callback thread failed for "
1354 "for client (clientid %08x/%08x)\n",
1355 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1356 put_nfs4_client(dp->dl_client);
1357 nfs4_put_delegation(dp);
1362 * The file_lock is being reapd.
1364 * Called by locks_free_lock() with lock_kernel() held.
1367 void nfsd_release_deleg_cb(struct file_lock *fl)
1369 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1371 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1373 if (!(fl->fl_flags & FL_LEASE) || !dp)
1375 dp->dl_flock = NULL;
1379 * Set the delegation file_lock back pointer.
1381 * Called from setlease() with lock_kernel() held.
1384 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1386 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1388 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1395 * Called from setlease() with lock_kernel() held
1398 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1400 struct nfs4_delegation *onlistd =
1401 (struct nfs4_delegation *)onlist->fl_owner;
1402 struct nfs4_delegation *tryd =
1403 (struct nfs4_delegation *)try->fl_owner;
1405 if (onlist->fl_lmops != try->fl_lmops)
1408 return onlistd->dl_client == tryd->dl_client;
1413 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1416 return lease_modify(onlist, arg);
1421 static struct lock_manager_operations nfsd_lease_mng_ops = {
1422 .fl_break = nfsd_break_deleg_cb,
1423 .fl_release_private = nfsd_release_deleg_cb,
1424 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1425 .fl_mylease = nfsd_same_client_deleg_cb,
1426 .fl_change = nfsd_change_deleg_cb,
1431 nfsd4_process_open1(struct nfsd4_open *open)
1433 clientid_t *clientid = &open->op_clientid;
1434 struct nfs4_client *clp = NULL;
1435 unsigned int strhashval;
1436 struct nfs4_stateowner *sop = NULL;
1438 if (!check_name(open->op_owner))
1439 return nfserr_inval;
1441 if (STALE_CLIENTID(&open->op_clientid))
1442 return nfserr_stale_clientid;
1444 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1445 sop = find_openstateowner_str(strhashval, open);
1446 open->op_stateowner = sop;
1448 /* Make sure the client's lease hasn't expired. */
1449 clp = find_confirmed_client(clientid);
1451 return nfserr_expired;
1454 if (!sop->so_confirmed) {
1455 /* Replace unconfirmed owners without checking for replay. */
1456 clp = sop->so_client;
1457 release_openowner(sop);
1458 open->op_stateowner = NULL;
1461 if (open->op_seqid == sop->so_seqid - 1) {
1462 if (sop->so_replay.rp_buflen)
1463 return nfserr_replay_me;
1464 /* The original OPEN failed so spectacularly
1465 * that we don't even have replay data saved!
1466 * Therefore, we have no choice but to continue
1467 * processing this OPEN; presumably, we'll
1468 * fail again for the same reason.
1470 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1473 if (open->op_seqid != sop->so_seqid)
1474 return nfserr_bad_seqid;
1476 if (open->op_stateowner == NULL) {
1477 sop = alloc_init_open_stateowner(strhashval, clp, open);
1479 return nfserr_resource;
1480 open->op_stateowner = sop;
1482 list_del_init(&sop->so_close_lru);
1483 renew_client(sop->so_client);
1487 static inline __be32
1488 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1490 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1491 return nfserr_openmode;
1496 static struct nfs4_delegation *
1497 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1499 struct nfs4_delegation *dp;
1501 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1502 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1509 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1510 struct nfs4_delegation **dp)
1513 __be32 status = nfserr_bad_stateid;
1515 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1518 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1519 RD_STATE : WR_STATE;
1520 status = nfs4_check_delegmode(*dp, flags);
1524 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1528 open->op_stateowner->so_confirmed = 1;
1533 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1535 struct nfs4_stateid *local;
1536 __be32 status = nfserr_share_denied;
1537 struct nfs4_stateowner *sop = open->op_stateowner;
1539 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1540 /* ignore lock owners */
1541 if (local->st_stateowner->so_is_open_owner == 0)
1543 /* remember if we have seen this open owner */
1544 if (local->st_stateowner == sop)
1546 /* check for conflicting share reservations */
1547 if (!test_share(local, open))
1555 static inline struct nfs4_stateid *
1556 nfs4_alloc_stateid(void)
1558 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1562 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1563 struct nfs4_delegation *dp,
1564 struct svc_fh *cur_fh, int flags)
1566 struct nfs4_stateid *stp;
1568 stp = nfs4_alloc_stateid();
1570 return nfserr_resource;
1573 get_file(dp->dl_vfs_file);
1574 stp->st_vfs_file = dp->dl_vfs_file;
1577 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1580 if (status == nfserr_dropit)
1581 status = nfserr_jukebox;
1582 kmem_cache_free(stateid_slab, stp);
1590 static inline __be32
1591 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1592 struct nfsd4_open *open)
1594 struct iattr iattr = {
1595 .ia_valid = ATTR_SIZE,
1598 if (!open->op_truncate)
1600 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1601 return nfserr_inval;
1602 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1606 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1608 struct file *filp = stp->st_vfs_file;
1609 struct inode *inode = filp->f_path.dentry->d_inode;
1610 unsigned int share_access, new_writer;
1613 set_access(&share_access, stp->st_access_bmap);
1614 new_writer = (~share_access) & open->op_share_access
1615 & NFS4_SHARE_ACCESS_WRITE;
1618 int err = get_write_access(inode);
1620 return nfserrno(err);
1621 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
1623 return nfserrno(err);
1624 file_take_write(filp);
1626 status = nfsd4_truncate(rqstp, cur_fh, open);
1629 put_write_access(inode);
1632 /* remember the open */
1633 filp->f_mode |= open->op_share_access;
1634 __set_bit(open->op_share_access, &stp->st_access_bmap);
1635 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1642 nfs4_set_claim_prev(struct nfsd4_open *open)
1644 open->op_stateowner->so_confirmed = 1;
1645 open->op_stateowner->so_client->cl_firststate = 1;
1649 * Attempt to hand out a delegation.
1652 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
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;
1660 flag = NFS4_OPEN_DELEGATE_NONE;
1661 open->op_recall = 0;
1662 switch (open->op_claim_type) {
1663 case NFS4_OPEN_CLAIM_PREVIOUS:
1664 if (!atomic_read(&cb->cb_set))
1665 open->op_recall = 1;
1666 flag = open->op_delegate_type;
1667 if (flag == NFS4_OPEN_DELEGATE_NONE)
1670 case NFS4_OPEN_CLAIM_NULL:
1671 /* Let's not give out any delegations till everyone's
1672 * had the chance to reclaim theirs.... */
1673 if (locks_in_grace())
1675 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1677 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1678 flag = NFS4_OPEN_DELEGATE_WRITE;
1680 flag = NFS4_OPEN_DELEGATE_READ;
1686 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1688 flag = NFS4_OPEN_DELEGATE_NONE;
1691 locks_init_lock(&fl);
1692 fl.fl_lmops = &nfsd_lease_mng_ops;
1693 fl.fl_flags = FL_LEASE;
1694 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
1695 fl.fl_end = OFFSET_MAX;
1696 fl.fl_owner = (fl_owner_t)dp;
1697 fl.fl_file = stp->st_vfs_file;
1698 fl.fl_pid = current->tgid;
1700 /* vfs_setlease checks to see if delegation should be handed out.
1701 * the lock_manager callbacks fl_mylease and fl_change are used
1703 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
1704 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1705 unhash_delegation(dp);
1706 flag = NFS4_OPEN_DELEGATE_NONE;
1710 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1712 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1713 dp->dl_stateid.si_boot,
1714 dp->dl_stateid.si_stateownerid,
1715 dp->dl_stateid.si_fileid,
1716 dp->dl_stateid.si_generation);
1718 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1719 && flag == NFS4_OPEN_DELEGATE_NONE
1720 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1721 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1722 open->op_delegate_type = flag;
1726 * called with nfs4_lock_state() held.
1729 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1731 struct nfs4_file *fp = NULL;
1732 struct inode *ino = current_fh->fh_dentry->d_inode;
1733 struct nfs4_stateid *stp = NULL;
1734 struct nfs4_delegation *dp = NULL;
1737 status = nfserr_inval;
1738 if (!access_valid(open->op_share_access)
1739 || !deny_valid(open->op_share_deny))
1742 * Lookup file; if found, lookup stateid and check open request,
1743 * and check for delegations in the process of being recalled.
1744 * If not found, create the nfs4_file struct
1746 fp = find_file(ino);
1748 if ((status = nfs4_check_open(fp, open, &stp)))
1750 status = nfs4_check_deleg(fp, open, &dp);
1754 status = nfserr_bad_stateid;
1755 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1757 status = nfserr_resource;
1758 fp = alloc_init_file(ino);
1764 * OPEN the file, or upgrade an existing OPEN.
1765 * If truncate fails, the OPEN fails.
1768 /* Stateid was found, this is an OPEN upgrade */
1769 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1772 update_stateid(&stp->st_stateid);
1774 /* Stateid was not found, this is a new OPEN */
1776 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1777 flags |= NFSD_MAY_READ;
1778 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1779 flags |= NFSD_MAY_WRITE;
1780 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1783 init_stateid(stp, fp, open);
1784 status = nfsd4_truncate(rqstp, current_fh, open);
1786 release_open_stateid(stp);
1790 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1793 * Attempt to hand out a delegation. No error return, because the
1794 * OPEN succeeds even if we fail.
1796 nfs4_open_delegation(current_fh, open, stp);
1800 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1801 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1802 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1806 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1807 nfs4_set_claim_prev(open);
1809 * To finish the open response, we just need to set the rflags.
1811 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1812 if (!open->op_stateowner->so_confirmed)
1813 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1819 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1822 struct nfs4_client *clp;
1826 dprintk("process_renew(%08x/%08x): starting\n",
1827 clid->cl_boot, clid->cl_id);
1828 status = nfserr_stale_clientid;
1829 if (STALE_CLIENTID(clid))
1831 clp = find_confirmed_client(clid);
1832 status = nfserr_expired;
1834 /* We assume the client took too long to RENEW. */
1835 dprintk("nfsd4_renew: clientid not found!\n");
1839 status = nfserr_cb_path_down;
1840 if (!list_empty(&clp->cl_delegations)
1841 && !atomic_read(&clp->cl_callback.cb_set))
1845 nfs4_unlock_state();
1849 struct lock_manager nfsd4_manager = {
1853 nfsd4_end_grace(void)
1855 dprintk("NFSD: end of grace period\n");
1856 nfsd4_recdir_purge_old();
1857 locks_end_grace(&nfsd4_manager);
1861 nfs4_laundromat(void)
1863 struct nfs4_client *clp;
1864 struct nfs4_stateowner *sop;
1865 struct nfs4_delegation *dp;
1866 struct list_head *pos, *next, reaplist;
1867 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1868 time_t t, clientid_val = NFSD_LEASE_TIME;
1869 time_t u, test_val = NFSD_LEASE_TIME;
1873 dprintk("NFSD: laundromat service - starting\n");
1874 if (locks_in_grace())
1876 list_for_each_safe(pos, next, &client_lru) {
1877 clp = list_entry(pos, struct nfs4_client, cl_lru);
1878 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1879 t = clp->cl_time - cutoff;
1880 if (clientid_val > t)
1884 dprintk("NFSD: purging unused client (clientid %08x)\n",
1885 clp->cl_clientid.cl_id);
1886 nfsd4_remove_clid_dir(clp);
1889 INIT_LIST_HEAD(&reaplist);
1890 spin_lock(&recall_lock);
1891 list_for_each_safe(pos, next, &del_recall_lru) {
1892 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1893 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1894 u = dp->dl_time - cutoff;
1899 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1901 list_move(&dp->dl_recall_lru, &reaplist);
1903 spin_unlock(&recall_lock);
1904 list_for_each_safe(pos, next, &reaplist) {
1905 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1906 list_del_init(&dp->dl_recall_lru);
1907 unhash_delegation(dp);
1909 test_val = NFSD_LEASE_TIME;
1910 list_for_each_safe(pos, next, &close_lru) {
1911 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1912 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1913 u = sop->so_time - cutoff;
1918 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1920 release_openowner(sop);
1922 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1923 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1924 nfs4_unlock_state();
1925 return clientid_val;
1928 static struct workqueue_struct *laundry_wq;
1929 static void laundromat_main(struct work_struct *);
1930 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1933 laundromat_main(struct work_struct *not_used)
1937 t = nfs4_laundromat();
1938 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1939 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1942 static struct nfs4_stateowner *
1943 search_close_lru(u32 st_id, int flags)
1945 struct nfs4_stateowner *local = NULL;
1947 if (flags & CLOSE_STATE) {
1948 list_for_each_entry(local, &close_lru, so_close_lru) {
1949 if (local->so_id == st_id)
1957 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1959 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1963 STALE_STATEID(stateid_t *stateid)
1965 if (stateid->si_boot == boot_time)
1967 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1968 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1969 stateid->si_generation);
1974 access_permit_read(unsigned long access_bmap)
1976 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1977 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1978 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1982 access_permit_write(unsigned long access_bmap)
1984 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1985 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1989 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1991 __be32 status = nfserr_openmode;
1993 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1995 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2002 static inline __be32
2003 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2005 /* Trying to call delegreturn with a special stateid? Yuch: */
2006 if (!(flags & (RD_STATE | WR_STATE)))
2007 return nfserr_bad_stateid;
2008 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
2010 else if (locks_in_grace()) {
2011 /* Answer in remaining cases depends on existance of
2012 * conflicting state; so we must wait out the grace period. */
2013 return nfserr_grace;
2014 } else if (flags & WR_STATE)
2015 return nfs4_share_conflict(current_fh,
2016 NFS4_SHARE_DENY_WRITE);
2017 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2018 return nfs4_share_conflict(current_fh,
2019 NFS4_SHARE_DENY_READ);
2023 * Allow READ/WRITE during grace period on recovered state only for files
2024 * that are not able to provide mandatory locking.
2027 io_during_grace_disallowed(struct inode *inode, int flags)
2029 return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
2030 && mandatory_lock(inode);
2033 static int check_stateid_generation(stateid_t *in, stateid_t *ref)
2035 /* If the client sends us a stateid from the future, it's buggy: */
2036 if (in->si_generation > ref->si_generation)
2037 return nfserr_bad_stateid;
2039 * The following, however, can happen. For example, if the
2040 * client sends an open and some IO at the same time, the open
2041 * may bump si_generation while the IO is still in flight.
2042 * Thanks to hard links and renames, the client never knows what
2043 * file an open will affect. So it could avoid that situation
2044 * only by serializing all opens and IO from the same open
2045 * owner. To recover from the old_stateid error, the client
2046 * will just have to retry the IO:
2048 if (in->si_generation < ref->si_generation)
2049 return nfserr_old_stateid;
2054 * Checks for stateid operations
2057 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
2059 struct nfs4_stateid *stp = NULL;
2060 struct nfs4_delegation *dp = NULL;
2062 struct inode *ino = current_fh->fh_dentry->d_inode;
2065 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
2066 stateid->si_boot, stateid->si_stateownerid,
2067 stateid->si_fileid, stateid->si_generation);
2071 if (io_during_grace_disallowed(ino, flags))
2072 return nfserr_grace;
2074 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2075 return check_special_stateids(current_fh, stateid, flags);
2078 status = nfserr_stale_stateid;
2079 if (STALE_STATEID(stateid))
2083 status = nfserr_bad_stateid;
2084 if (!stateid->si_fileid) { /* delegation stateid */
2085 if(!(dp = find_delegation_stateid(ino, stateid))) {
2086 dprintk("NFSD: delegation stateid not found\n");
2089 stidp = &dp->dl_stateid;
2090 } else { /* open or lock stateid */
2091 if (!(stp = find_stateid(stateid, flags))) {
2092 dprintk("NFSD: open or lock stateid not found\n");
2095 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2097 if (!stp->st_stateowner->so_confirmed)
2099 stidp = &stp->st_stateid;
2101 status = check_stateid_generation(stateid, stidp);
2105 if ((status = nfs4_check_openmode(stp,flags)))
2107 renew_client(stp->st_stateowner->so_client);
2109 *filpp = stp->st_vfs_file;
2111 if ((status = nfs4_check_delegmode(dp, flags)))
2113 renew_client(dp->dl_client);
2114 if (flags & DELEG_RET)
2115 unhash_delegation(dp);
2117 *filpp = dp->dl_vfs_file;
2127 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2128 RD_STATE : WR_STATE;
2132 * Checks for sequence id mutating operations.
2135 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)
2137 struct nfs4_stateid *stp;
2138 struct nfs4_stateowner *sop;
2141 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2142 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2143 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2144 stateid->si_generation);
2149 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2150 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2151 return nfserr_bad_stateid;
2154 if (STALE_STATEID(stateid))
2155 return nfserr_stale_stateid;
2157 * We return BAD_STATEID if filehandle doesn't match stateid,
2158 * the confirmed flag is incorrecly set, or the generation
2159 * number is incorrect.
2161 stp = find_stateid(stateid, flags);
2164 * Also, we should make sure this isn't just the result of
2167 sop = search_close_lru(stateid->si_stateownerid, flags);
2169 return nfserr_bad_stateid;
2175 *sopp = sop = stp->st_stateowner;
2178 clientid_t *lockclid = &lock->v.new.clientid;
2179 struct nfs4_client *clp = sop->so_client;
2183 lkflg = setlkflg(lock->lk_type);
2185 if (lock->lk_is_new) {
2186 if (!sop->so_is_open_owner)
2187 return nfserr_bad_stateid;
2188 if (!same_clid(&clp->cl_clientid, lockclid))
2189 return nfserr_bad_stateid;
2190 /* stp is the open stateid */
2191 status = nfs4_check_openmode(stp, lkflg);
2195 /* stp is the lock stateid */
2196 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2202 if (nfs4_check_fh(current_fh, stp)) {
2203 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2204 return nfserr_bad_stateid;
2208 * We now validate the seqid and stateid generation numbers.
2209 * For the moment, we ignore the possibility of
2210 * generation number wraparound.
2212 if (seqid != sop->so_seqid)
2215 if (sop->so_confirmed && flags & CONFIRM) {
2216 dprintk("NFSD: preprocess_seqid_op: expected"
2217 " unconfirmed stateowner!\n");
2218 return nfserr_bad_stateid;
2220 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2221 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2222 " confirmed yet!\n");
2223 return nfserr_bad_stateid;
2225 status = check_stateid_generation(stateid, &stp->st_stateid);
2228 renew_client(sop->so_client);
2232 if (seqid == sop->so_seqid - 1) {
2233 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2234 /* indicate replay to calling function */
2235 return nfserr_replay_me;
2237 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2238 sop->so_seqid, seqid);
2240 return nfserr_bad_seqid;
2244 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2245 struct nfsd4_open_confirm *oc)
2248 struct nfs4_stateowner *sop;
2249 struct nfs4_stateid *stp;
2251 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2252 (int)cstate->current_fh.fh_dentry->d_name.len,
2253 cstate->current_fh.fh_dentry->d_name.name);
2255 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2261 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2262 oc->oc_seqid, &oc->oc_req_stateid,
2263 CONFIRM | OPEN_STATE,
2264 &oc->oc_stateowner, &stp, NULL)))
2267 sop = oc->oc_stateowner;
2268 sop->so_confirmed = 1;
2269 update_stateid(&stp->st_stateid);
2270 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2271 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2272 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2273 stp->st_stateid.si_boot,
2274 stp->st_stateid.si_stateownerid,
2275 stp->st_stateid.si_fileid,
2276 stp->st_stateid.si_generation);
2278 nfsd4_create_clid_dir(sop->so_client);
2280 if (oc->oc_stateowner) {
2281 nfs4_get_stateowner(oc->oc_stateowner);
2282 cstate->replay_owner = oc->oc_stateowner;
2284 nfs4_unlock_state();
2290 * unset all bits in union bitmap (bmap) that
2291 * do not exist in share (from successful OPEN_DOWNGRADE)
2294 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2297 for (i = 1; i < 4; i++) {
2298 if ((i & access) != i)
2299 __clear_bit(i, bmap);
2304 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2307 for (i = 0; i < 4; i++) {
2308 if ((i & deny) != i)
2309 __clear_bit(i, bmap);
2314 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2315 struct nfsd4_compound_state *cstate,
2316 struct nfsd4_open_downgrade *od)
2319 struct nfs4_stateid *stp;
2320 unsigned int share_access;
2322 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2323 (int)cstate->current_fh.fh_dentry->d_name.len,
2324 cstate->current_fh.fh_dentry->d_name.name);
2326 if (!access_valid(od->od_share_access)
2327 || !deny_valid(od->od_share_deny))
2328 return nfserr_inval;
2331 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2335 &od->od_stateowner, &stp, NULL)))
2338 status = nfserr_inval;
2339 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2340 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2341 stp->st_access_bmap, od->od_share_access);
2344 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2345 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2346 stp->st_deny_bmap, od->od_share_deny);
2349 set_access(&share_access, stp->st_access_bmap);
2350 nfs4_file_downgrade(stp->st_vfs_file,
2351 share_access & ~od->od_share_access);
2353 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2354 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2356 update_stateid(&stp->st_stateid);
2357 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2360 if (od->od_stateowner) {
2361 nfs4_get_stateowner(od->od_stateowner);
2362 cstate->replay_owner = od->od_stateowner;
2364 nfs4_unlock_state();
2369 * nfs4_unlock_state() called after encode
2372 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2373 struct nfsd4_close *close)
2376 struct nfs4_stateid *stp;
2378 dprintk("NFSD: nfsd4_close on file %.*s\n",
2379 (int)cstate->current_fh.fh_dentry->d_name.len,
2380 cstate->current_fh.fh_dentry->d_name.name);
2383 /* check close_lru for replay */
2384 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2387 OPEN_STATE | CLOSE_STATE,
2388 &close->cl_stateowner, &stp, NULL)))
2391 update_stateid(&stp->st_stateid);
2392 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2394 /* release_stateid() calls nfsd_close() if needed */
2395 release_open_stateid(stp);
2397 /* place unused nfs4_stateowners on so_close_lru list to be
2398 * released by the laundromat service after the lease period
2399 * to enable us to handle CLOSE replay
2401 if (list_empty(&close->cl_stateowner->so_stateids))
2402 move_to_close_lru(close->cl_stateowner);
2404 if (close->cl_stateowner) {
2405 nfs4_get_stateowner(close->cl_stateowner);
2406 cstate->replay_owner = close->cl_stateowner;
2408 nfs4_unlock_state();
2413 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2414 struct nfsd4_delegreturn *dr)
2418 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2422 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2423 &dr->dr_stateid, DELEG_RET, NULL);
2424 nfs4_unlock_state();
2431 * Lock owner state (byte-range locks)
2433 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2434 #define LOCK_HASH_BITS 8
2435 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2436 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2439 end_offset(u64 start, u64 len)
2444 return end >= start ? end: NFS4_MAX_UINT64;
2447 /* last octet in a range */
2449 last_byte_offset(u64 start, u64 len)
2455 return end > start ? end - 1: NFS4_MAX_UINT64;
2458 #define lockownerid_hashval(id) \
2459 ((id) & LOCK_HASH_MASK)
2461 static inline unsigned int
2462 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2463 struct xdr_netobj *ownername)
2465 return (file_hashval(inode) + cl_id
2466 + opaque_hashval(ownername->data, ownername->len))
2470 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2471 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2472 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2474 static struct nfs4_stateid *
2475 find_stateid(stateid_t *stid, int flags)
2477 struct nfs4_stateid *local;
2478 u32 st_id = stid->si_stateownerid;
2479 u32 f_id = stid->si_fileid;
2480 unsigned int hashval;
2482 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2483 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
2484 hashval = stateid_hashval(st_id, f_id);
2485 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2486 if ((local->st_stateid.si_stateownerid == st_id) &&
2487 (local->st_stateid.si_fileid == f_id))
2492 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
2493 hashval = stateid_hashval(st_id, f_id);
2494 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2495 if ((local->st_stateid.si_stateownerid == st_id) &&
2496 (local->st_stateid.si_fileid == f_id))
2503 static struct nfs4_delegation *
2504 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2506 struct nfs4_file *fp;
2507 struct nfs4_delegation *dl;
2509 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2510 stid->si_boot, stid->si_stateownerid,
2511 stid->si_fileid, stid->si_generation);
2513 fp = find_file(ino);
2516 dl = find_delegation_file(fp, stid);
2522 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2523 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2524 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2525 * locking, this prevents us from being completely protocol-compliant. The
2526 * real solution to this problem is to start using unsigned file offsets in
2527 * the VFS, but this is a very deep change!
2530 nfs4_transform_lock_offset(struct file_lock *lock)
2532 if (lock->fl_start < 0)
2533 lock->fl_start = OFFSET_MAX;
2534 if (lock->fl_end < 0)
2535 lock->fl_end = OFFSET_MAX;
2538 /* Hack!: For now, we're defining this just so we can use a pointer to it
2539 * as a unique cookie to identify our (NFSv4's) posix locks. */
2540 static struct lock_manager_operations nfsd_posix_mng_ops = {
2544 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2546 struct nfs4_stateowner *sop;
2549 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2550 sop = (struct nfs4_stateowner *) fl->fl_owner;
2551 hval = lockownerid_hashval(sop->so_id);
2552 kref_get(&sop->so_ref);
2554 deny->ld_clientid = sop->so_client->cl_clientid;
2556 deny->ld_sop = NULL;
2557 deny->ld_clientid.cl_boot = 0;
2558 deny->ld_clientid.cl_id = 0;
2560 deny->ld_start = fl->fl_start;
2561 deny->ld_length = NFS4_MAX_UINT64;
2562 if (fl->fl_end != NFS4_MAX_UINT64)
2563 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2564 deny->ld_type = NFS4_READ_LT;
2565 if (fl->fl_type != F_RDLCK)
2566 deny->ld_type = NFS4_WRITE_LT;
2569 static struct nfs4_stateowner *
2570 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2571 struct xdr_netobj *owner)
2573 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2574 struct nfs4_stateowner *op;
2576 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2577 if (same_owner_str(op, owner, clid))
2584 * Alloc a lock owner structure.
2585 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2588 * strhashval = lock_ownerstr_hashval
2591 static struct nfs4_stateowner *
2592 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2593 struct nfs4_stateowner *sop;
2594 struct nfs4_replay *rp;
2595 unsigned int idhashval;
2597 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2599 idhashval = lockownerid_hashval(current_ownerid);
2600 INIT_LIST_HEAD(&sop->so_idhash);
2601 INIT_LIST_HEAD(&sop->so_strhash);
2602 INIT_LIST_HEAD(&sop->so_perclient);
2603 INIT_LIST_HEAD(&sop->so_stateids);
2604 INIT_LIST_HEAD(&sop->so_perstateid);
2605 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2607 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2608 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2609 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2610 sop->so_is_open_owner = 0;
2611 sop->so_id = current_ownerid++;
2612 sop->so_client = clp;
2613 /* It is the openowner seqid that will be incremented in encode in the
2614 * case of new lockowners; so increment the lock seqid manually: */
2615 sop->so_seqid = lock->lk_new_lock_seqid + 1;
2616 sop->so_confirmed = 1;
2617 rp = &sop->so_replay;
2618 rp->rp_status = nfserr_serverfault;
2620 rp->rp_buf = rp->rp_ibuf;
2624 static struct nfs4_stateid *
2625 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2627 struct nfs4_stateid *stp;
2628 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2630 stp = nfs4_alloc_stateid();
2633 INIT_LIST_HEAD(&stp->st_hash);
2634 INIT_LIST_HEAD(&stp->st_perfile);
2635 INIT_LIST_HEAD(&stp->st_perstateowner);
2636 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2637 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2638 list_add(&stp->st_perfile, &fp->fi_stateids);
2639 list_add(&stp->st_perstateowner, &sop->so_stateids);
2640 stp->st_stateowner = sop;
2643 stp->st_stateid.si_boot = boot_time;
2644 stp->st_stateid.si_stateownerid = sop->so_id;
2645 stp->st_stateid.si_fileid = fp->fi_id;
2646 stp->st_stateid.si_generation = 0;
2647 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2648 stp->st_access_bmap = open_stp->st_access_bmap;
2649 stp->st_deny_bmap = open_stp->st_deny_bmap;
2650 stp->st_openstp = open_stp;
2657 check_lock_length(u64 offset, u64 length)
2659 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
2660 LOFF_OVERFLOW(offset, length)));
2667 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2668 struct nfsd4_lock *lock)
2670 struct nfs4_stateowner *open_sop = NULL;
2671 struct nfs4_stateowner *lock_sop = NULL;
2672 struct nfs4_stateid *lock_stp;
2674 struct file_lock file_lock;
2675 struct file_lock conflock;
2677 unsigned int strhashval;
2681 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2682 (long long) lock->lk_offset,
2683 (long long) lock->lk_length);
2685 if (check_lock_length(lock->lk_offset, lock->lk_length))
2686 return nfserr_inval;
2688 if ((status = fh_verify(rqstp, &cstate->current_fh,
2689 S_IFREG, NFSD_MAY_LOCK))) {
2690 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2696 if (lock->lk_is_new) {
2698 * Client indicates that this is a new lockowner.
2699 * Use open owner and open stateid to create lock owner and
2702 struct nfs4_stateid *open_stp = NULL;
2703 struct nfs4_file *fp;
2705 status = nfserr_stale_clientid;
2706 if (STALE_CLIENTID(&lock->lk_new_clientid))
2709 /* validate and update open stateid and open seqid */
2710 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2711 lock->lk_new_open_seqid,
2712 &lock->lk_new_open_stateid,
2714 &lock->lk_replay_owner, &open_stp,
2718 open_sop = lock->lk_replay_owner;
2719 /* create lockowner and lock stateid */
2720 fp = open_stp->st_file;
2721 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2722 open_sop->so_client->cl_clientid.cl_id,
2723 &lock->v.new.owner);
2724 /* XXX: Do we need to check for duplicate stateowners on
2725 * the same file, or should they just be allowed (and
2726 * create new stateids)? */
2727 status = nfserr_resource;
2728 lock_sop = alloc_init_lock_stateowner(strhashval,
2729 open_sop->so_client, open_stp, lock);
2730 if (lock_sop == NULL)
2732 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2733 if (lock_stp == NULL)
2736 /* lock (lock owner + lock stateid) already exists */
2737 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2738 lock->lk_old_lock_seqid,
2739 &lock->lk_old_lock_stateid,
2741 &lock->lk_replay_owner, &lock_stp, lock);
2744 lock_sop = lock->lk_replay_owner;
2746 /* lock->lk_replay_owner and lock_stp have been created or found */
2747 filp = lock_stp->st_vfs_file;
2749 status = nfserr_grace;
2750 if (locks_in_grace() && !lock->lk_reclaim)
2752 status = nfserr_no_grace;
2753 if (!locks_in_grace() && lock->lk_reclaim)
2756 locks_init_lock(&file_lock);
2757 switch (lock->lk_type) {
2760 file_lock.fl_type = F_RDLCK;
2764 case NFS4_WRITEW_LT:
2765 file_lock.fl_type = F_WRLCK;
2769 status = nfserr_inval;
2772 file_lock.fl_owner = (fl_owner_t)lock_sop;
2773 file_lock.fl_pid = current->tgid;
2774 file_lock.fl_file = filp;
2775 file_lock.fl_flags = FL_POSIX;
2776 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2778 file_lock.fl_start = lock->lk_offset;
2779 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
2780 nfs4_transform_lock_offset(&file_lock);
2783 * Try to lock the file in the VFS.
2784 * Note: locks.c uses the BKL to protect the inode's lock list.
2787 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2789 case 0: /* success! */
2790 update_stateid(&lock_stp->st_stateid);
2791 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2795 case (EAGAIN): /* conflock holds conflicting lock */
2796 status = nfserr_denied;
2797 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2798 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2801 status = nfserr_deadlock;
2804 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2805 status = nfserr_resource;
2809 if (status && lock->lk_is_new && lock_sop)
2810 release_lockowner(lock_sop);
2811 if (lock->lk_replay_owner) {
2812 nfs4_get_stateowner(lock->lk_replay_owner);
2813 cstate->replay_owner = lock->lk_replay_owner;
2815 nfs4_unlock_state();
2820 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
2821 * so we do a temporary open here just to get an open file to pass to
2822 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
2825 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
2830 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
2833 err = vfs_test_lock(file, lock);
2842 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2843 struct nfsd4_lockt *lockt)
2845 struct inode *inode;
2846 struct file_lock file_lock;
2850 if (locks_in_grace())
2851 return nfserr_grace;
2853 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2854 return nfserr_inval;
2856 lockt->lt_stateowner = NULL;
2859 status = nfserr_stale_clientid;
2860 if (STALE_CLIENTID(&lockt->lt_clientid))
2863 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2864 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2865 if (status == nfserr_symlink)
2866 status = nfserr_inval;
2870 inode = cstate->current_fh.fh_dentry->d_inode;
2871 locks_init_lock(&file_lock);
2872 switch (lockt->lt_type) {
2875 file_lock.fl_type = F_RDLCK;
2878 case NFS4_WRITEW_LT:
2879 file_lock.fl_type = F_WRLCK;
2882 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2883 status = nfserr_inval;
2887 lockt->lt_stateowner = find_lockstateowner_str(inode,
2888 &lockt->lt_clientid, &lockt->lt_owner);
2889 if (lockt->lt_stateowner)
2890 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2891 file_lock.fl_pid = current->tgid;
2892 file_lock.fl_flags = FL_POSIX;
2894 file_lock.fl_start = lockt->lt_offset;
2895 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
2897 nfs4_transform_lock_offset(&file_lock);
2900 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
2902 status = nfserrno(error);
2905 if (file_lock.fl_type != F_UNLCK) {
2906 status = nfserr_denied;
2907 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2910 nfs4_unlock_state();
2915 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2916 struct nfsd4_locku *locku)
2918 struct nfs4_stateid *stp;
2919 struct file *filp = NULL;
2920 struct file_lock file_lock;
2924 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2925 (long long) locku->lu_offset,
2926 (long long) locku->lu_length);
2928 if (check_lock_length(locku->lu_offset, locku->lu_length))
2929 return nfserr_inval;
2933 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2937 &locku->lu_stateowner, &stp, NULL)))
2940 filp = stp->st_vfs_file;
2942 locks_init_lock(&file_lock);
2943 file_lock.fl_type = F_UNLCK;
2944 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2945 file_lock.fl_pid = current->tgid;
2946 file_lock.fl_file = filp;
2947 file_lock.fl_flags = FL_POSIX;
2948 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2949 file_lock.fl_start = locku->lu_offset;
2951 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
2952 nfs4_transform_lock_offset(&file_lock);
2955 * Try to unlock the file in the VFS.
2957 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2959 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2963 * OK, unlock succeeded; the only thing left to do is update the stateid.
2965 update_stateid(&stp->st_stateid);
2966 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2969 if (locku->lu_stateowner) {
2970 nfs4_get_stateowner(locku->lu_stateowner);
2971 cstate->replay_owner = locku->lu_stateowner;
2973 nfs4_unlock_state();
2977 status = nfserrno(err);
2983 * 1: locks held by lockowner
2984 * 0: no locks held by lockowner
2987 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2989 struct file_lock **flpp;
2990 struct inode *inode = filp->f_path.dentry->d_inode;
2994 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2995 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
3006 nfsd4_release_lockowner(struct svc_rqst *rqstp,
3007 struct nfsd4_compound_state *cstate,
3008 struct nfsd4_release_lockowner *rlockowner)
3010 clientid_t *clid = &rlockowner->rl_clientid;
3011 struct nfs4_stateowner *sop;
3012 struct nfs4_stateid *stp;
3013 struct xdr_netobj *owner = &rlockowner->rl_owner;
3014 struct list_head matches;
3018 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3019 clid->cl_boot, clid->cl_id);
3021 /* XXX check for lease expiration */
3023 status = nfserr_stale_clientid;
3024 if (STALE_CLIENTID(clid))
3029 status = nfserr_locks_held;
3030 /* XXX: we're doing a linear search through all the lockowners.
3031 * Yipes! For now we'll just hope clients aren't really using
3032 * release_lockowner much, but eventually we have to fix these
3033 * data structures. */
3034 INIT_LIST_HEAD(&matches);
3035 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3036 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3037 if (!same_owner_str(sop, owner, clid))
3039 list_for_each_entry(stp, &sop->so_stateids,
3041 if (check_for_locks(stp->st_vfs_file, sop))
3043 /* Note: so_perclient unused for lockowners,
3044 * so it's OK to fool with here. */
3045 list_add(&sop->so_perclient, &matches);
3049 /* Clients probably won't expect us to return with some (but not all)
3050 * of the lockowner state released; so don't release any until all
3051 * have been checked. */
3053 while (!list_empty(&matches)) {
3054 sop = list_entry(matches.next, struct nfs4_stateowner,
3056 /* unhash_stateowner deletes so_perclient only
3057 * for openowners. */
3058 list_del(&sop->so_perclient);
3059 release_lockowner(sop);
3062 nfs4_unlock_state();
3066 static inline struct nfs4_client_reclaim *
3069 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3073 nfs4_has_reclaimed_state(const char *name)
3075 unsigned int strhashval = clientstr_hashval(name);
3076 struct nfs4_client *clp;
3078 clp = find_confirmed_client_by_str(name, strhashval);
3083 * failure => all reset bets are off, nfserr_no_grace...
3086 nfs4_client_to_reclaim(const char *name)
3088 unsigned int strhashval;
3089 struct nfs4_client_reclaim *crp = NULL;
3091 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3092 crp = alloc_reclaim();
3095 strhashval = clientstr_hashval(name);
3096 INIT_LIST_HEAD(&crp->cr_strhash);
3097 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3098 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3099 reclaim_str_hashtbl_size++;
3104 nfs4_release_reclaim(void)
3106 struct nfs4_client_reclaim *crp = NULL;
3109 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3110 while (!list_empty(&reclaim_str_hashtbl[i])) {
3111 crp = list_entry(reclaim_str_hashtbl[i].next,
3112 struct nfs4_client_reclaim, cr_strhash);
3113 list_del(&crp->cr_strhash);
3115 reclaim_str_hashtbl_size--;
3118 BUG_ON(reclaim_str_hashtbl_size);
3122 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3123 static struct nfs4_client_reclaim *
3124 nfs4_find_reclaim_client(clientid_t *clid)
3126 unsigned int strhashval;
3127 struct nfs4_client *clp;
3128 struct nfs4_client_reclaim *crp = NULL;
3131 /* find clientid in conf_id_hashtbl */
3132 clp = find_confirmed_client(clid);
3136 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3137 clp->cl_name.len, clp->cl_name.data,
3140 /* find clp->cl_name in reclaim_str_hashtbl */
3141 strhashval = clientstr_hashval(clp->cl_recdir);
3142 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3143 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3151 * Called from OPEN. Look for clientid in reclaim list.
3154 nfs4_check_open_reclaim(clientid_t *clid)
3156 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3159 /* initialization to perform at module load time: */
3162 nfs4_state_init(void)
3166 status = nfsd4_init_slabs();
3169 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3170 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3171 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3172 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3173 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3175 for (i = 0; i < FILE_HASH_SIZE; i++) {
3176 INIT_LIST_HEAD(&file_hashtbl[i]);
3178 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3179 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3180 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3182 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3183 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3184 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3186 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3187 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3188 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3190 memset(&onestateid, ~0, sizeof(stateid_t));
3191 INIT_LIST_HEAD(&close_lru);
3192 INIT_LIST_HEAD(&client_lru);
3193 INIT_LIST_HEAD(&del_recall_lru);
3194 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3195 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3196 reclaim_str_hashtbl_size = 0;
3201 nfsd4_load_reboot_recovery_data(void)
3206 nfsd4_init_recdir(user_recovery_dirname);
3207 status = nfsd4_recdir_load();
3208 nfs4_unlock_state();
3210 printk("NFSD: Failure reading reboot recovery data\n");
3214 get_nfs4_grace_period(void)
3216 return max(user_lease_time, lease_time) * HZ;
3220 * Since the lifetime of a delegation isn't limited to that of an open, a
3221 * client may quite reasonably hang on to a delegation as long as it has
3222 * the inode cached. This becomes an obvious problem the first time a
3223 * client's inode cache approaches the size of the server's total memory.
3225 * For now we avoid this problem by imposing a hard limit on the number
3226 * of delegations, which varies according to the server's memory size.
3229 set_max_delegations(void)
3232 * Allow at most 4 delegations per megabyte of RAM. Quick
3233 * estimates suggest that in the worst case (where every delegation
3234 * is for a different inode), a delegation could take about 1.5K,
3235 * giving a worst case usage of about 6% of memory.
3237 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3240 /* initialization to perform when the nfsd service is started: */
3243 __nfs4_state_start(void)
3245 unsigned long grace_time;
3247 boot_time = get_seconds();
3248 grace_time = get_nfs4_grace_period();
3249 lease_time = user_lease_time;
3250 locks_start_grace(&nfsd4_manager);
3251 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3253 laundry_wq = create_singlethread_workqueue("nfsd4");
3254 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3255 set_max_delegations();
3259 nfs4_state_start(void)
3263 nfsd4_load_reboot_recovery_data();
3264 __nfs4_state_start();
3270 nfs4_lease_time(void)
3276 __nfs4_state_shutdown(void)
3279 struct nfs4_client *clp = NULL;
3280 struct nfs4_delegation *dp = NULL;
3281 struct list_head *pos, *next, reaplist;
3283 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3284 while (!list_empty(&conf_id_hashtbl[i])) {
3285 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3288 while (!list_empty(&unconf_str_hashtbl[i])) {
3289 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3293 INIT_LIST_HEAD(&reaplist);
3294 spin_lock(&recall_lock);
3295 list_for_each_safe(pos, next, &del_recall_lru) {
3296 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3297 list_move(&dp->dl_recall_lru, &reaplist);
3299 spin_unlock(&recall_lock);
3300 list_for_each_safe(pos, next, &reaplist) {
3301 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3302 list_del_init(&dp->dl_recall_lru);
3303 unhash_delegation(dp);
3306 nfsd4_shutdown_recdir();
3311 nfs4_state_shutdown(void)
3313 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3314 destroy_workqueue(laundry_wq);
3315 locks_end_grace(&nfsd4_manager);
3317 nfs4_release_reclaim();
3318 __nfs4_state_shutdown();
3319 nfs4_unlock_state();
3323 * user_recovery_dirname is protected by the nfsd_mutex since it's only
3324 * accessed when nfsd is starting.
3327 nfs4_set_recdir(char *recdir)
3329 strcpy(user_recovery_dirname, recdir);
3333 * Change the NFSv4 recovery directory to recdir.
3336 nfs4_reset_recoverydir(char *recdir)
3341 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
3345 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
3346 nfs4_set_recdir(recdir);
3354 nfs4_recoverydir(void)
3356 return user_recovery_dirname;
3360 * Called when leasetime is changed.
3362 * The only way the protocol gives us to handle on-the-fly lease changes is to
3363 * simulate a reboot. Instead of doing that, we just wait till the next time
3364 * we start to register any changes in lease time. If the administrator
3365 * really wants to change the lease time *now*, they can go ahead and bring
3366 * nfsd down and then back up again after changing the lease time.
3368 * user_lease_time is protected by nfsd_mutex since it's only really accessed
3369 * when nfsd is starting
3372 nfs4_reset_lease(time_t leasetime)
3374 user_lease_time = leasetime;