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/mount.h>
45 #include <linux/workqueue.h>
46 #include <linux/smp_lock.h>
47 #include <linux/kthread.h>
48 #include <linux/nfs4.h>
49 #include <linux/nfsd/state.h>
50 #include <linux/nfsd/xdr4.h>
51 #include <linux/namei.h>
52 #include <linux/swap.h>
53 #include <linux/mutex.h>
54 #include <linux/lockd/bind.h>
55 #include <linux/module.h>
57 #define NFSDDBG_FACILITY NFSDDBG_PROC
60 static time_t lease_time = 90; /* default lease time */
61 static time_t user_lease_time = 90;
62 static time_t boot_time;
63 static int in_grace = 1;
64 static u32 current_clientid = 1;
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 void release_stateid_lockowners(struct nfs4_stateid *open_stp);
79 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
80 static void nfs4_set_recdir(char *recdir);
85 * protects clientid_hashtbl[], clientstr_hashtbl[],
86 * unconfstr_hashtbl[], uncofid_hashtbl[].
88 static DEFINE_MUTEX(client_mutex);
90 static struct kmem_cache *stateowner_slab = NULL;
91 static struct kmem_cache *file_slab = NULL;
92 static struct kmem_cache *stateid_slab = NULL;
93 static struct kmem_cache *deleg_slab = NULL;
98 mutex_lock(&client_mutex);
102 nfs4_unlock_state(void)
104 mutex_unlock(&client_mutex);
108 opaque_hashval(const void *ptr, int nbytes)
110 unsigned char *cptr = (unsigned char *) ptr;
120 /* forward declarations */
121 static void release_stateowner(struct nfs4_stateowner *sop);
122 static void release_stateid(struct nfs4_stateid *stp, int flags);
128 /* recall_lock protects the del_recall_lru */
129 static DEFINE_SPINLOCK(recall_lock);
130 static struct list_head del_recall_lru;
133 free_nfs4_file(struct kref *kref)
135 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
136 list_del(&fp->fi_hash);
138 kmem_cache_free(file_slab, fp);
142 put_nfs4_file(struct nfs4_file *fi)
144 kref_put(&fi->fi_ref, free_nfs4_file);
148 get_nfs4_file(struct nfs4_file *fi)
150 kref_get(&fi->fi_ref);
153 static int num_delegations;
154 unsigned int max_delegations;
157 * Open owner state (share locks)
160 /* hash tables for nfs4_stateowner */
161 #define OWNER_HASH_BITS 8
162 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
163 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
165 #define ownerid_hashval(id) \
166 ((id) & OWNER_HASH_MASK)
167 #define ownerstr_hashval(clientid, ownername) \
168 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
170 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
171 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
173 /* hash table for nfs4_file */
174 #define FILE_HASH_BITS 8
175 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
176 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
177 /* hash table for (open)nfs4_stateid */
178 #define STATEID_HASH_BITS 10
179 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
180 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
182 #define file_hashval(x) \
183 hash_ptr(x, FILE_HASH_BITS)
184 #define stateid_hashval(owner_id, file_id) \
185 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
187 static struct list_head file_hashtbl[FILE_HASH_SIZE];
188 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
190 static struct nfs4_delegation *
191 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
193 struct nfs4_delegation *dp;
194 struct nfs4_file *fp = stp->st_file;
195 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
197 dprintk("NFSD alloc_init_deleg\n");
198 if (fp->fi_had_conflict)
200 if (num_delegations > max_delegations)
202 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
206 INIT_LIST_HEAD(&dp->dl_perfile);
207 INIT_LIST_HEAD(&dp->dl_perclnt);
208 INIT_LIST_HEAD(&dp->dl_recall_lru);
213 get_file(stp->st_vfs_file);
214 dp->dl_vfs_file = stp->st_vfs_file;
216 dp->dl_recall.cbr_dp = NULL;
217 dp->dl_recall.cbr_ident = cb->cb_ident;
218 dp->dl_recall.cbr_trunc = 0;
219 dp->dl_stateid.si_boot = boot_time;
220 dp->dl_stateid.si_stateownerid = current_delegid++;
221 dp->dl_stateid.si_fileid = 0;
222 dp->dl_stateid.si_generation = 0;
223 dp->dl_fhlen = current_fh->fh_handle.fh_size;
224 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base,
225 current_fh->fh_handle.fh_size);
227 atomic_set(&dp->dl_count, 1);
228 list_add(&dp->dl_perfile, &fp->fi_delegations);
229 list_add(&dp->dl_perclnt, &clp->cl_delegations);
234 nfs4_put_delegation(struct nfs4_delegation *dp)
236 if (atomic_dec_and_test(&dp->dl_count)) {
237 dprintk("NFSD: freeing dp %p\n",dp);
238 put_nfs4_file(dp->dl_file);
239 kmem_cache_free(deleg_slab, dp);
244 /* Remove the associated file_lock first, then remove the delegation.
245 * lease_modify() is called to remove the FS_LEASE file_lock from
246 * the i_flock list, eventually calling nfsd's lock_manager
247 * fl_release_callback.
250 nfs4_close_delegation(struct nfs4_delegation *dp)
252 struct file *filp = dp->dl_vfs_file;
254 dprintk("NFSD: close_delegation dp %p\n",dp);
255 dp->dl_vfs_file = NULL;
256 /* The following nfsd_close may not actually close the file,
257 * but we want to remove the lease in any case. */
259 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
263 /* Called under the state lock. */
265 unhash_delegation(struct nfs4_delegation *dp)
267 list_del_init(&dp->dl_perfile);
268 list_del_init(&dp->dl_perclnt);
269 spin_lock(&recall_lock);
270 list_del_init(&dp->dl_recall_lru);
271 spin_unlock(&recall_lock);
272 nfs4_close_delegation(dp);
273 nfs4_put_delegation(dp);
280 /* Hash tables for nfs4_clientid state */
281 #define CLIENT_HASH_BITS 4
282 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
283 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
285 #define clientid_hashval(id) \
286 ((id) & CLIENT_HASH_MASK)
287 #define clientstr_hashval(name) \
288 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
290 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
291 * used in reboot/reset lease grace period processing
293 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
294 * setclientid_confirmed info.
296 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
299 * client_lru holds client queue ordered by nfs4_client.cl_time
302 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
303 * for last close replay.
305 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
306 static int reclaim_str_hashtbl_size = 0;
307 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
308 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
309 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
310 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
311 static struct list_head client_lru;
312 static struct list_head close_lru;
315 renew_client(struct nfs4_client *clp)
318 * Move client to the end to the LRU list.
320 dprintk("renewing client (clientid %08x/%08x)\n",
321 clp->cl_clientid.cl_boot,
322 clp->cl_clientid.cl_id);
323 list_move_tail(&clp->cl_lru, &client_lru);
324 clp->cl_time = get_seconds();
327 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
329 STALE_CLIENTID(clientid_t *clid)
331 if (clid->cl_boot == boot_time)
333 dprintk("NFSD stale clientid (%08x/%08x)\n",
334 clid->cl_boot, clid->cl_id);
339 * XXX Should we use a slab cache ?
340 * This type of memory management is somewhat inefficient, but we use it
341 * anyway since SETCLIENTID is not a common operation.
343 static inline struct nfs4_client *
344 alloc_client(struct xdr_netobj name)
346 struct nfs4_client *clp;
348 if ((clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL))!= NULL) {
349 if ((clp->cl_name.data = kmalloc(name.len, GFP_KERNEL)) != NULL) {
350 memcpy(clp->cl_name.data, name.data, name.len);
351 clp->cl_name.len = name.len;
362 shutdown_callback_client(struct nfs4_client *clp)
364 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
366 /* shutdown rpc client, ending any outstanding recall rpcs */
368 clp->cl_callback.cb_client = NULL;
369 rpc_shutdown_client(clnt);
374 free_client(struct nfs4_client *clp)
376 shutdown_callback_client(clp);
377 if (clp->cl_cred.cr_group_info)
378 put_group_info(clp->cl_cred.cr_group_info);
379 kfree(clp->cl_name.data);
384 put_nfs4_client(struct nfs4_client *clp)
386 if (atomic_dec_and_test(&clp->cl_count))
391 expire_client(struct nfs4_client *clp)
393 struct nfs4_stateowner *sop;
394 struct nfs4_delegation *dp;
395 struct list_head reaplist;
397 dprintk("NFSD: expire_client cl_count %d\n",
398 atomic_read(&clp->cl_count));
400 INIT_LIST_HEAD(&reaplist);
401 spin_lock(&recall_lock);
402 while (!list_empty(&clp->cl_delegations)) {
403 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
404 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
406 list_del_init(&dp->dl_perclnt);
407 list_move(&dp->dl_recall_lru, &reaplist);
409 spin_unlock(&recall_lock);
410 while (!list_empty(&reaplist)) {
411 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
412 list_del_init(&dp->dl_recall_lru);
413 unhash_delegation(dp);
415 list_del(&clp->cl_idhash);
416 list_del(&clp->cl_strhash);
417 list_del(&clp->cl_lru);
418 while (!list_empty(&clp->cl_openowners)) {
419 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
420 release_stateowner(sop);
422 put_nfs4_client(clp);
425 static struct nfs4_client *
426 create_client(struct xdr_netobj name, char *recdir) {
427 struct nfs4_client *clp;
429 if (!(clp = alloc_client(name)))
431 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
432 atomic_set(&clp->cl_count, 1);
433 atomic_set(&clp->cl_callback.cb_set, 0);
434 INIT_LIST_HEAD(&clp->cl_idhash);
435 INIT_LIST_HEAD(&clp->cl_strhash);
436 INIT_LIST_HEAD(&clp->cl_openowners);
437 INIT_LIST_HEAD(&clp->cl_delegations);
438 INIT_LIST_HEAD(&clp->cl_lru);
444 copy_verf(struct nfs4_client *target, nfs4_verifier *source) {
445 memcpy(target->cl_verifier.data, source->data, sizeof(target->cl_verifier.data));
449 copy_clid(struct nfs4_client *target, struct nfs4_client *source) {
450 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
451 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
455 copy_cred(struct svc_cred *target, struct svc_cred *source) {
457 target->cr_uid = source->cr_uid;
458 target->cr_gid = source->cr_gid;
459 target->cr_group_info = source->cr_group_info;
460 get_group_info(target->cr_group_info);
464 same_name(const char *n1, const char *n2)
466 return 0 == memcmp(n1, n2, HEXDIR_LEN);
470 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
472 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
476 same_clid(clientid_t *cl1, clientid_t *cl2)
478 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
481 /* XXX what about NGROUP */
483 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
485 return cr1->cr_uid == cr2->cr_uid;
489 gen_clid(struct nfs4_client *clp) {
490 clp->cl_clientid.cl_boot = boot_time;
491 clp->cl_clientid.cl_id = current_clientid++;
494 static void gen_confirm(struct nfs4_client *clp)
499 p = (u32 *)clp->cl_confirm.data;
500 *p++ = get_seconds();
505 check_name(struct xdr_netobj name) {
509 if (name.len > NFS4_OPAQUE_LIMIT) {
510 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
517 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
519 unsigned int idhashval;
521 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
522 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
523 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
524 list_add_tail(&clp->cl_lru, &client_lru);
525 clp->cl_time = get_seconds();
529 move_to_confirmed(struct nfs4_client *clp)
531 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
532 unsigned int strhashval;
534 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
535 list_del_init(&clp->cl_strhash);
536 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
537 strhashval = clientstr_hashval(clp->cl_recdir);
538 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
542 static struct nfs4_client *
543 find_confirmed_client(clientid_t *clid)
545 struct nfs4_client *clp;
546 unsigned int idhashval = clientid_hashval(clid->cl_id);
548 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
549 if (same_clid(&clp->cl_clientid, clid))
555 static struct nfs4_client *
556 find_unconfirmed_client(clientid_t *clid)
558 struct nfs4_client *clp;
559 unsigned int idhashval = clientid_hashval(clid->cl_id);
561 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
562 if (same_clid(&clp->cl_clientid, clid))
568 static struct nfs4_client *
569 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
571 struct nfs4_client *clp;
573 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
574 if (same_name(clp->cl_recdir, dname))
580 static struct nfs4_client *
581 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
583 struct nfs4_client *clp;
585 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
586 if (same_name(clp->cl_recdir, dname))
592 /* a helper function for parse_callback */
594 parse_octet(unsigned int *lenp, char **addrp)
596 unsigned int len = *lenp;
608 if ((c < '0') || (c > '9')) {
614 n = (n * 10) + (c - '0');
625 /* parse and set the setclientid ipv4 callback address */
627 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
632 u32 addrlen = addr_len;
633 char *addr = addr_val;
638 for(i = 4; i > 0 ; i--) {
639 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
642 cbaddr |= (temp << shift);
650 for(i = 2; i > 0 ; i--) {
651 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
654 cbport |= (temp << shift);
663 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
665 struct nfs4_callback *cb = &clp->cl_callback;
667 /* Currently, we only support tcp for the callback channel */
668 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
671 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
672 &cb->cb_addr, &cb->cb_port)))
674 cb->cb_prog = se->se_callback_prog;
675 cb->cb_ident = se->se_callback_ident;
678 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
679 "will not receive delegations\n",
680 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
686 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
687 struct nfsd4_setclientid *setclid)
689 struct sockaddr_in *sin = svc_addr_in(rqstp);
690 struct xdr_netobj clname = {
691 .len = setclid->se_namelen,
692 .data = setclid->se_name,
694 nfs4_verifier clverifier = setclid->se_verf;
695 unsigned int strhashval;
696 struct nfs4_client *conf, *unconf, *new;
698 char dname[HEXDIR_LEN];
700 if (!check_name(clname))
703 status = nfs4_make_rec_clidname(dname, &clname);
708 * XXX The Duplicate Request Cache (DRC) has been checked (??)
709 * We get here on a DRC miss.
712 strhashval = clientstr_hashval(dname);
715 conf = find_confirmed_client_by_str(dname, strhashval);
717 /* RFC 3530 14.2.33 CASE 0: */
718 status = nfserr_clid_inuse;
719 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
720 || conf->cl_addr != sin->sin_addr.s_addr) {
721 dprintk("NFSD: setclientid: string in use by client"
722 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
727 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
728 * has a description of SETCLIENTID request processing consisting
729 * of 5 bullet points, labeled as CASE0 - CASE4 below.
731 unconf = find_unconfirmed_client_by_str(dname, strhashval);
732 status = nfserr_resource;
735 * RFC 3530 14.2.33 CASE 4:
736 * placed first, because it is the normal case
739 expire_client(unconf);
740 new = create_client(clname, dname);
744 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
746 * RFC 3530 14.2.33 CASE 1:
747 * probable callback update
750 /* Note this is removing unconfirmed {*x***},
751 * which is stronger than RFC recommended {vxc**}.
752 * This has the advantage that there is at most
753 * one {*x***} in either list at any time.
755 expire_client(unconf);
757 new = create_client(clname, dname);
760 copy_clid(new, conf);
761 } else if (!unconf) {
763 * RFC 3530 14.2.33 CASE 2:
764 * probable client reboot; state will be removed if
767 new = create_client(clname, dname);
773 * RFC 3530 14.2.33 CASE 3:
774 * probable client reboot; state will be removed if
777 expire_client(unconf);
778 new = create_client(clname, dname);
783 copy_verf(new, &clverifier);
784 new->cl_addr = sin->sin_addr.s_addr;
785 copy_cred(&new->cl_cred, &rqstp->rq_cred);
787 gen_callback(new, setclid);
788 add_to_unconfirmed(new, strhashval);
789 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
790 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
791 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
800 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
801 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
802 * bullets, labeled as CASE1 - CASE4 below.
805 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
806 struct nfsd4_compound_state *cstate,
807 struct nfsd4_setclientid_confirm *setclientid_confirm)
809 struct sockaddr_in *sin = svc_addr_in(rqstp);
810 struct nfs4_client *conf, *unconf;
811 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
812 clientid_t * clid = &setclientid_confirm->sc_clientid;
815 if (STALE_CLIENTID(clid))
816 return nfserr_stale_clientid;
818 * XXX The Duplicate Request Cache (DRC) has been checked (??)
819 * We get here on a DRC miss.
824 conf = find_confirmed_client(clid);
825 unconf = find_unconfirmed_client(clid);
827 status = nfserr_clid_inuse;
828 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
830 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
834 * section 14.2.34 of RFC 3530 has a description of
835 * SETCLIENTID_CONFIRM request processing consisting
836 * of 4 bullet points, labeled as CASE1 - CASE4 below.
838 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
840 * RFC 3530 14.2.34 CASE 1:
843 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
844 status = nfserr_clid_inuse;
846 /* XXX: We just turn off callbacks until we can handle
847 * change request correctly. */
848 atomic_set(&conf->cl_callback.cb_set, 0);
850 nfsd4_remove_clid_dir(unconf);
851 expire_client(unconf);
855 } else if (conf && !unconf) {
857 * RFC 3530 14.2.34 CASE 2:
858 * probable retransmitted request; play it safe and
861 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
862 status = nfserr_clid_inuse;
865 } else if (!conf && unconf
866 && same_verf(&unconf->cl_confirm, &confirm)) {
868 * RFC 3530 14.2.34 CASE 3:
869 * Normal case; new or rebooted client:
871 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
872 status = nfserr_clid_inuse;
875 clientstr_hashval(unconf->cl_recdir);
876 conf = find_confirmed_client_by_str(unconf->cl_recdir,
879 nfsd4_remove_clid_dir(conf);
882 move_to_confirmed(unconf);
884 nfsd4_probe_callback(conf);
887 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
888 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
891 * RFC 3530 14.2.34 CASE 4:
892 * Client probably hasn't noticed that we rebooted yet.
894 status = nfserr_stale_clientid;
896 /* check that we have hit one of the cases...*/
897 status = nfserr_clid_inuse;
904 /* OPEN Share state helper functions */
905 static inline struct nfs4_file *
906 alloc_init_file(struct inode *ino)
908 struct nfs4_file *fp;
909 unsigned int hashval = file_hashval(ino);
911 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
913 kref_init(&fp->fi_ref);
914 INIT_LIST_HEAD(&fp->fi_hash);
915 INIT_LIST_HEAD(&fp->fi_stateids);
916 INIT_LIST_HEAD(&fp->fi_delegations);
917 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
918 fp->fi_inode = igrab(ino);
919 fp->fi_id = current_fileid++;
920 fp->fi_had_conflict = false;
927 nfsd4_free_slab(struct kmem_cache **slab)
931 kmem_cache_destroy(*slab);
936 nfsd4_free_slabs(void)
938 nfsd4_free_slab(&stateowner_slab);
939 nfsd4_free_slab(&file_slab);
940 nfsd4_free_slab(&stateid_slab);
941 nfsd4_free_slab(&deleg_slab);
945 nfsd4_init_slabs(void)
947 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
948 sizeof(struct nfs4_stateowner), 0, 0, NULL);
949 if (stateowner_slab == NULL)
951 file_slab = kmem_cache_create("nfsd4_files",
952 sizeof(struct nfs4_file), 0, 0, NULL);
953 if (file_slab == NULL)
955 stateid_slab = kmem_cache_create("nfsd4_stateids",
956 sizeof(struct nfs4_stateid), 0, 0, NULL);
957 if (stateid_slab == NULL)
959 deleg_slab = kmem_cache_create("nfsd4_delegations",
960 sizeof(struct nfs4_delegation), 0, 0, NULL);
961 if (deleg_slab == NULL)
966 dprintk("nfsd4: out of memory while initializing nfsv4\n");
971 nfs4_free_stateowner(struct kref *kref)
973 struct nfs4_stateowner *sop =
974 container_of(kref, struct nfs4_stateowner, so_ref);
975 kfree(sop->so_owner.data);
976 kmem_cache_free(stateowner_slab, sop);
979 static inline struct nfs4_stateowner *
980 alloc_stateowner(struct xdr_netobj *owner)
982 struct nfs4_stateowner *sop;
984 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
985 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
986 memcpy(sop->so_owner.data, owner->data, owner->len);
987 sop->so_owner.len = owner->len;
988 kref_init(&sop->so_ref);
991 kmem_cache_free(stateowner_slab, sop);
996 static struct nfs4_stateowner *
997 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
998 struct nfs4_stateowner *sop;
999 struct nfs4_replay *rp;
1000 unsigned int idhashval;
1002 if (!(sop = alloc_stateowner(&open->op_owner)))
1004 idhashval = ownerid_hashval(current_ownerid);
1005 INIT_LIST_HEAD(&sop->so_idhash);
1006 INIT_LIST_HEAD(&sop->so_strhash);
1007 INIT_LIST_HEAD(&sop->so_perclient);
1008 INIT_LIST_HEAD(&sop->so_stateids);
1009 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1010 INIT_LIST_HEAD(&sop->so_close_lru);
1012 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1013 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1014 list_add(&sop->so_perclient, &clp->cl_openowners);
1015 sop->so_is_open_owner = 1;
1016 sop->so_id = current_ownerid++;
1017 sop->so_client = clp;
1018 sop->so_seqid = open->op_seqid;
1019 sop->so_confirmed = 0;
1020 rp = &sop->so_replay;
1021 rp->rp_status = nfserr_serverfault;
1023 rp->rp_buf = rp->rp_ibuf;
1028 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1030 struct nfs4_stateowner *lock_sop;
1032 while (!list_empty(&open_stp->st_lockowners)) {
1033 lock_sop = list_entry(open_stp->st_lockowners.next,
1034 struct nfs4_stateowner, so_perstateid);
1035 /* list_del(&open_stp->st_lockowners); */
1036 BUG_ON(lock_sop->so_is_open_owner);
1037 release_stateowner(lock_sop);
1042 unhash_stateowner(struct nfs4_stateowner *sop)
1044 struct nfs4_stateid *stp;
1046 list_del(&sop->so_idhash);
1047 list_del(&sop->so_strhash);
1048 if (sop->so_is_open_owner)
1049 list_del(&sop->so_perclient);
1050 list_del(&sop->so_perstateid);
1051 while (!list_empty(&sop->so_stateids)) {
1052 stp = list_entry(sop->so_stateids.next,
1053 struct nfs4_stateid, st_perstateowner);
1054 if (sop->so_is_open_owner)
1055 release_stateid(stp, OPEN_STATE);
1057 release_stateid(stp, LOCK_STATE);
1062 release_stateowner(struct nfs4_stateowner *sop)
1064 unhash_stateowner(sop);
1065 list_del(&sop->so_close_lru);
1066 nfs4_put_stateowner(sop);
1070 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1071 struct nfs4_stateowner *sop = open->op_stateowner;
1072 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1074 INIT_LIST_HEAD(&stp->st_hash);
1075 INIT_LIST_HEAD(&stp->st_perstateowner);
1076 INIT_LIST_HEAD(&stp->st_lockowners);
1077 INIT_LIST_HEAD(&stp->st_perfile);
1078 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1079 list_add(&stp->st_perstateowner, &sop->so_stateids);
1080 list_add(&stp->st_perfile, &fp->fi_stateids);
1081 stp->st_stateowner = sop;
1084 stp->st_stateid.si_boot = boot_time;
1085 stp->st_stateid.si_stateownerid = sop->so_id;
1086 stp->st_stateid.si_fileid = fp->fi_id;
1087 stp->st_stateid.si_generation = 0;
1088 stp->st_access_bmap = 0;
1089 stp->st_deny_bmap = 0;
1090 __set_bit(open->op_share_access, &stp->st_access_bmap);
1091 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1092 stp->st_openstp = NULL;
1096 release_stateid(struct nfs4_stateid *stp, int flags)
1098 struct file *filp = stp->st_vfs_file;
1100 list_del(&stp->st_hash);
1101 list_del(&stp->st_perfile);
1102 list_del(&stp->st_perstateowner);
1103 if (flags & OPEN_STATE) {
1104 release_stateid_lockowners(stp);
1105 stp->st_vfs_file = NULL;
1107 } else if (flags & LOCK_STATE)
1108 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1109 put_nfs4_file(stp->st_file);
1110 kmem_cache_free(stateid_slab, stp);
1114 move_to_close_lru(struct nfs4_stateowner *sop)
1116 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1118 list_move_tail(&sop->so_close_lru, &close_lru);
1119 sop->so_time = get_seconds();
1123 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1126 return (sop->so_owner.len == owner->len) &&
1127 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1128 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1131 static struct nfs4_stateowner *
1132 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1134 struct nfs4_stateowner *so = NULL;
1136 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1137 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1143 /* search file_hashtbl[] for file */
1144 static struct nfs4_file *
1145 find_file(struct inode *ino)
1147 unsigned int hashval = file_hashval(ino);
1148 struct nfs4_file *fp;
1150 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1151 if (fp->fi_inode == ino) {
1159 static int access_valid(u32 x)
1161 return (x > 0 && x < 4);
1164 static int deny_valid(u32 x)
1166 return (x >= 0 && x < 5);
1170 set_access(unsigned int *access, unsigned long bmap) {
1174 for (i = 1; i < 4; i++) {
1175 if (test_bit(i, &bmap))
1181 set_deny(unsigned int *deny, unsigned long bmap) {
1185 for (i = 0; i < 4; i++) {
1186 if (test_bit(i, &bmap))
1192 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1193 unsigned int access, deny;
1195 set_access(&access, stp->st_access_bmap);
1196 set_deny(&deny, stp->st_deny_bmap);
1197 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1203 * Called to check deny when READ with all zero stateid or
1204 * WRITE with all zero or all one stateid
1207 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1209 struct inode *ino = current_fh->fh_dentry->d_inode;
1210 struct nfs4_file *fp;
1211 struct nfs4_stateid *stp;
1214 dprintk("NFSD: nfs4_share_conflict\n");
1216 fp = find_file(ino);
1219 ret = nfserr_locked;
1220 /* Search for conflicting share reservations */
1221 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1222 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1223 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1233 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1235 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1236 put_write_access(filp->f_path.dentry->d_inode);
1237 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1242 * Recall a delegation
1245 do_recall(void *__dp)
1247 struct nfs4_delegation *dp = __dp;
1249 dp->dl_file->fi_had_conflict = true;
1250 nfsd4_cb_recall(dp);
1255 * Spawn a thread to perform a recall on the delegation represented
1256 * by the lease (file_lock)
1258 * Called from break_lease() with lock_kernel() held.
1259 * Note: we assume break_lease will only call this *once* for any given
1263 void nfsd_break_deleg_cb(struct file_lock *fl)
1265 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1266 struct task_struct *t;
1268 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1272 /* We're assuming the state code never drops its reference
1273 * without first removing the lease. Since we're in this lease
1274 * callback (and since the lease code is serialized by the kernel
1275 * lock) we know the server hasn't removed the lease yet, we know
1276 * it's safe to take a reference: */
1277 atomic_inc(&dp->dl_count);
1278 atomic_inc(&dp->dl_client->cl_count);
1280 spin_lock(&recall_lock);
1281 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1282 spin_unlock(&recall_lock);
1284 /* only place dl_time is set. protected by lock_kernel*/
1285 dp->dl_time = get_seconds();
1288 * We don't want the locks code to timeout the lease for us;
1289 * we'll remove it ourself if the delegation isn't returned
1292 fl->fl_break_time = 0;
1294 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1296 struct nfs4_client *clp = dp->dl_client;
1298 printk(KERN_INFO "NFSD: Callback thread failed for "
1299 "for client (clientid %08x/%08x)\n",
1300 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1301 put_nfs4_client(dp->dl_client);
1302 nfs4_put_delegation(dp);
1307 * The file_lock is being reapd.
1309 * Called by locks_free_lock() with lock_kernel() held.
1312 void nfsd_release_deleg_cb(struct file_lock *fl)
1314 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1316 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1318 if (!(fl->fl_flags & FL_LEASE) || !dp)
1320 dp->dl_flock = NULL;
1324 * Set the delegation file_lock back pointer.
1326 * Called from setlease() with lock_kernel() held.
1329 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1331 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1333 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1340 * Called from setlease() with lock_kernel() held
1343 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1345 struct nfs4_delegation *onlistd =
1346 (struct nfs4_delegation *)onlist->fl_owner;
1347 struct nfs4_delegation *tryd =
1348 (struct nfs4_delegation *)try->fl_owner;
1350 if (onlist->fl_lmops != try->fl_lmops)
1353 return onlistd->dl_client == tryd->dl_client;
1358 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1361 return lease_modify(onlist, arg);
1366 static struct lock_manager_operations nfsd_lease_mng_ops = {
1367 .fl_break = nfsd_break_deleg_cb,
1368 .fl_release_private = nfsd_release_deleg_cb,
1369 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1370 .fl_mylease = nfsd_same_client_deleg_cb,
1371 .fl_change = nfsd_change_deleg_cb,
1376 nfsd4_process_open1(struct nfsd4_open *open)
1378 clientid_t *clientid = &open->op_clientid;
1379 struct nfs4_client *clp = NULL;
1380 unsigned int strhashval;
1381 struct nfs4_stateowner *sop = NULL;
1383 if (!check_name(open->op_owner))
1384 return nfserr_inval;
1386 if (STALE_CLIENTID(&open->op_clientid))
1387 return nfserr_stale_clientid;
1389 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1390 sop = find_openstateowner_str(strhashval, open);
1391 open->op_stateowner = sop;
1393 /* Make sure the client's lease hasn't expired. */
1394 clp = find_confirmed_client(clientid);
1396 return nfserr_expired;
1399 if (!sop->so_confirmed) {
1400 /* Replace unconfirmed owners without checking for replay. */
1401 clp = sop->so_client;
1402 release_stateowner(sop);
1403 open->op_stateowner = NULL;
1406 if (open->op_seqid == sop->so_seqid - 1) {
1407 if (sop->so_replay.rp_buflen)
1408 return nfserr_replay_me;
1409 /* The original OPEN failed so spectacularly
1410 * that we don't even have replay data saved!
1411 * Therefore, we have no choice but to continue
1412 * processing this OPEN; presumably, we'll
1413 * fail again for the same reason.
1415 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1418 if (open->op_seqid != sop->so_seqid)
1419 return nfserr_bad_seqid;
1421 if (open->op_stateowner == NULL) {
1422 sop = alloc_init_open_stateowner(strhashval, clp, open);
1424 return nfserr_resource;
1425 open->op_stateowner = sop;
1427 list_del_init(&sop->so_close_lru);
1428 renew_client(sop->so_client);
1432 static inline __be32
1433 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1435 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1436 return nfserr_openmode;
1441 static struct nfs4_delegation *
1442 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1444 struct nfs4_delegation *dp;
1446 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1447 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1454 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1455 struct nfs4_delegation **dp)
1458 __be32 status = nfserr_bad_stateid;
1460 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1463 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1464 RD_STATE : WR_STATE;
1465 status = nfs4_check_delegmode(*dp, flags);
1469 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1473 open->op_stateowner->so_confirmed = 1;
1478 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1480 struct nfs4_stateid *local;
1481 __be32 status = nfserr_share_denied;
1482 struct nfs4_stateowner *sop = open->op_stateowner;
1484 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1485 /* ignore lock owners */
1486 if (local->st_stateowner->so_is_open_owner == 0)
1488 /* remember if we have seen this open owner */
1489 if (local->st_stateowner == sop)
1491 /* check for conflicting share reservations */
1492 if (!test_share(local, open))
1500 static inline struct nfs4_stateid *
1501 nfs4_alloc_stateid(void)
1503 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1507 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1508 struct nfs4_delegation *dp,
1509 struct svc_fh *cur_fh, int flags)
1511 struct nfs4_stateid *stp;
1513 stp = nfs4_alloc_stateid();
1515 return nfserr_resource;
1518 get_file(dp->dl_vfs_file);
1519 stp->st_vfs_file = dp->dl_vfs_file;
1522 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1525 if (status == nfserr_dropit)
1526 status = nfserr_jukebox;
1527 kmem_cache_free(stateid_slab, stp);
1535 static inline __be32
1536 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1537 struct nfsd4_open *open)
1539 struct iattr iattr = {
1540 .ia_valid = ATTR_SIZE,
1543 if (!open->op_truncate)
1545 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1546 return nfserr_inval;
1547 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1551 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1553 struct file *filp = stp->st_vfs_file;
1554 struct inode *inode = filp->f_path.dentry->d_inode;
1555 unsigned int share_access, new_writer;
1558 set_access(&share_access, stp->st_access_bmap);
1559 new_writer = (~share_access) & open->op_share_access
1560 & NFS4_SHARE_ACCESS_WRITE;
1563 int err = get_write_access(inode);
1565 return nfserrno(err);
1567 status = nfsd4_truncate(rqstp, cur_fh, open);
1570 put_write_access(inode);
1573 /* remember the open */
1574 filp->f_mode |= open->op_share_access;
1575 set_bit(open->op_share_access, &stp->st_access_bmap);
1576 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1583 nfs4_set_claim_prev(struct nfsd4_open *open)
1585 open->op_stateowner->so_confirmed = 1;
1586 open->op_stateowner->so_client->cl_firststate = 1;
1590 * Attempt to hand out a delegation.
1593 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1595 struct nfs4_delegation *dp;
1596 struct nfs4_stateowner *sop = stp->st_stateowner;
1597 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1598 struct file_lock fl, *flp = &fl;
1599 int status, flag = 0;
1601 flag = NFS4_OPEN_DELEGATE_NONE;
1602 open->op_recall = 0;
1603 switch (open->op_claim_type) {
1604 case NFS4_OPEN_CLAIM_PREVIOUS:
1605 if (!atomic_read(&cb->cb_set))
1606 open->op_recall = 1;
1607 flag = open->op_delegate_type;
1608 if (flag == NFS4_OPEN_DELEGATE_NONE)
1611 case NFS4_OPEN_CLAIM_NULL:
1612 /* Let's not give out any delegations till everyone's
1613 * had the chance to reclaim theirs.... */
1614 if (nfs4_in_grace())
1616 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1618 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1619 flag = NFS4_OPEN_DELEGATE_WRITE;
1621 flag = NFS4_OPEN_DELEGATE_READ;
1627 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1629 flag = NFS4_OPEN_DELEGATE_NONE;
1632 locks_init_lock(&fl);
1633 fl.fl_lmops = &nfsd_lease_mng_ops;
1634 fl.fl_flags = FL_LEASE;
1635 fl.fl_end = OFFSET_MAX;
1636 fl.fl_owner = (fl_owner_t)dp;
1637 fl.fl_file = stp->st_vfs_file;
1638 fl.fl_pid = current->tgid;
1640 /* vfs_setlease checks to see if delegation should be handed out.
1641 * the lock_manager callbacks fl_mylease and fl_change are used
1643 if ((status = vfs_setlease(stp->st_vfs_file,
1644 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1645 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1646 unhash_delegation(dp);
1647 flag = NFS4_OPEN_DELEGATE_NONE;
1651 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1653 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1654 dp->dl_stateid.si_boot,
1655 dp->dl_stateid.si_stateownerid,
1656 dp->dl_stateid.si_fileid,
1657 dp->dl_stateid.si_generation);
1659 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1660 && flag == NFS4_OPEN_DELEGATE_NONE
1661 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1662 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1663 open->op_delegate_type = flag;
1667 * called with nfs4_lock_state() held.
1670 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1672 struct nfs4_file *fp = NULL;
1673 struct inode *ino = current_fh->fh_dentry->d_inode;
1674 struct nfs4_stateid *stp = NULL;
1675 struct nfs4_delegation *dp = NULL;
1678 status = nfserr_inval;
1679 if (!access_valid(open->op_share_access)
1680 || !deny_valid(open->op_share_deny))
1683 * Lookup file; if found, lookup stateid and check open request,
1684 * and check for delegations in the process of being recalled.
1685 * If not found, create the nfs4_file struct
1687 fp = find_file(ino);
1689 if ((status = nfs4_check_open(fp, open, &stp)))
1691 status = nfs4_check_deleg(fp, open, &dp);
1695 status = nfserr_bad_stateid;
1696 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1698 status = nfserr_resource;
1699 fp = alloc_init_file(ino);
1705 * OPEN the file, or upgrade an existing OPEN.
1706 * If truncate fails, the OPEN fails.
1709 /* Stateid was found, this is an OPEN upgrade */
1710 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1713 update_stateid(&stp->st_stateid);
1715 /* Stateid was not found, this is a new OPEN */
1717 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1719 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1721 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1724 init_stateid(stp, fp, open);
1725 status = nfsd4_truncate(rqstp, current_fh, open);
1727 release_stateid(stp, OPEN_STATE);
1731 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1734 * Attempt to hand out a delegation. No error return, because the
1735 * OPEN succeeds even if we fail.
1737 nfs4_open_delegation(current_fh, open, stp);
1741 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1742 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1743 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1747 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1748 nfs4_set_claim_prev(open);
1750 * To finish the open response, we just need to set the rflags.
1752 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1753 if (!open->op_stateowner->so_confirmed)
1754 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1759 static struct workqueue_struct *laundry_wq;
1760 static void laundromat_main(struct work_struct *);
1761 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1764 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1767 struct nfs4_client *clp;
1771 dprintk("process_renew(%08x/%08x): starting\n",
1772 clid->cl_boot, clid->cl_id);
1773 status = nfserr_stale_clientid;
1774 if (STALE_CLIENTID(clid))
1776 clp = find_confirmed_client(clid);
1777 status = nfserr_expired;
1779 /* We assume the client took too long to RENEW. */
1780 dprintk("nfsd4_renew: clientid not found!\n");
1784 status = nfserr_cb_path_down;
1785 if (!list_empty(&clp->cl_delegations)
1786 && !atomic_read(&clp->cl_callback.cb_set))
1790 nfs4_unlock_state();
1797 dprintk("NFSD: end of grace period\n");
1798 nfsd4_recdir_purge_old();
1803 nfs4_laundromat(void)
1805 struct nfs4_client *clp;
1806 struct nfs4_stateowner *sop;
1807 struct nfs4_delegation *dp;
1808 struct list_head *pos, *next, reaplist;
1809 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1810 time_t t, clientid_val = NFSD_LEASE_TIME;
1811 time_t u, test_val = NFSD_LEASE_TIME;
1815 dprintk("NFSD: laundromat service - starting\n");
1818 list_for_each_safe(pos, next, &client_lru) {
1819 clp = list_entry(pos, struct nfs4_client, cl_lru);
1820 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1821 t = clp->cl_time - cutoff;
1822 if (clientid_val > t)
1826 dprintk("NFSD: purging unused client (clientid %08x)\n",
1827 clp->cl_clientid.cl_id);
1828 nfsd4_remove_clid_dir(clp);
1831 INIT_LIST_HEAD(&reaplist);
1832 spin_lock(&recall_lock);
1833 list_for_each_safe(pos, next, &del_recall_lru) {
1834 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1835 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1836 u = dp->dl_time - cutoff;
1841 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1843 list_move(&dp->dl_recall_lru, &reaplist);
1845 spin_unlock(&recall_lock);
1846 list_for_each_safe(pos, next, &reaplist) {
1847 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1848 list_del_init(&dp->dl_recall_lru);
1849 unhash_delegation(dp);
1851 test_val = NFSD_LEASE_TIME;
1852 list_for_each_safe(pos, next, &close_lru) {
1853 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1854 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1855 u = sop->so_time - cutoff;
1860 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1862 release_stateowner(sop);
1864 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1865 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1866 nfs4_unlock_state();
1867 return clientid_val;
1871 laundromat_main(struct work_struct *not_used)
1875 t = nfs4_laundromat();
1876 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1877 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1880 static struct nfs4_stateowner *
1881 search_close_lru(u32 st_id, int flags)
1883 struct nfs4_stateowner *local = NULL;
1885 if (flags & CLOSE_STATE) {
1886 list_for_each_entry(local, &close_lru, so_close_lru) {
1887 if (local->so_id == st_id)
1895 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1897 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1901 STALE_STATEID(stateid_t *stateid)
1903 if (stateid->si_boot == boot_time)
1905 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1906 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1907 stateid->si_generation);
1912 access_permit_read(unsigned long access_bmap)
1914 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1915 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1916 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1920 access_permit_write(unsigned long access_bmap)
1922 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1923 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1927 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1929 __be32 status = nfserr_openmode;
1931 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1933 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1940 static inline __be32
1941 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1943 /* Trying to call delegreturn with a special stateid? Yuch: */
1944 if (!(flags & (RD_STATE | WR_STATE)))
1945 return nfserr_bad_stateid;
1946 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1948 else if (nfs4_in_grace()) {
1949 /* Answer in remaining cases depends on existance of
1950 * conflicting state; so we must wait out the grace period. */
1951 return nfserr_grace;
1952 } else if (flags & WR_STATE)
1953 return nfs4_share_conflict(current_fh,
1954 NFS4_SHARE_DENY_WRITE);
1955 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1956 return nfs4_share_conflict(current_fh,
1957 NFS4_SHARE_DENY_READ);
1961 * Allow READ/WRITE during grace period on recovered state only for files
1962 * that are not able to provide mandatory locking.
1965 io_during_grace_disallowed(struct inode *inode, int flags)
1967 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1968 && mandatory_lock(inode);
1972 * Checks for stateid operations
1975 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1977 struct nfs4_stateid *stp = NULL;
1978 struct nfs4_delegation *dp = NULL;
1980 struct inode *ino = current_fh->fh_dentry->d_inode;
1983 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1984 stateid->si_boot, stateid->si_stateownerid,
1985 stateid->si_fileid, stateid->si_generation);
1989 if (io_during_grace_disallowed(ino, flags))
1990 return nfserr_grace;
1992 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1993 return check_special_stateids(current_fh, stateid, flags);
1996 status = nfserr_stale_stateid;
1997 if (STALE_STATEID(stateid))
2001 status = nfserr_bad_stateid;
2002 if (!stateid->si_fileid) { /* delegation stateid */
2003 if(!(dp = find_delegation_stateid(ino, stateid))) {
2004 dprintk("NFSD: delegation stateid not found\n");
2007 stidp = &dp->dl_stateid;
2008 } else { /* open or lock stateid */
2009 if (!(stp = find_stateid(stateid, flags))) {
2010 dprintk("NFSD: open or lock stateid not found\n");
2013 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2015 if (!stp->st_stateowner->so_confirmed)
2017 stidp = &stp->st_stateid;
2019 if (stateid->si_generation > stidp->si_generation)
2023 status = nfserr_old_stateid;
2024 if (stateid->si_generation < stidp->si_generation)
2027 if ((status = nfs4_check_openmode(stp,flags)))
2029 renew_client(stp->st_stateowner->so_client);
2031 *filpp = stp->st_vfs_file;
2033 if ((status = nfs4_check_delegmode(dp, flags)))
2035 renew_client(dp->dl_client);
2036 if (flags & DELEG_RET)
2037 unhash_delegation(dp);
2039 *filpp = dp->dl_vfs_file;
2049 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2050 RD_STATE : WR_STATE;
2054 * Checks for sequence id mutating operations.
2057 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)
2059 struct nfs4_stateid *stp;
2060 struct nfs4_stateowner *sop;
2062 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2063 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2064 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2065 stateid->si_generation);
2070 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2071 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2072 return nfserr_bad_stateid;
2075 if (STALE_STATEID(stateid))
2076 return nfserr_stale_stateid;
2078 * We return BAD_STATEID if filehandle doesn't match stateid,
2079 * the confirmed flag is incorrecly set, or the generation
2080 * number is incorrect.
2082 stp = find_stateid(stateid, flags);
2085 * Also, we should make sure this isn't just the result of
2088 sop = search_close_lru(stateid->si_stateownerid, flags);
2090 return nfserr_bad_stateid;
2096 struct nfs4_stateowner *sop = stp->st_stateowner;
2097 clientid_t *lockclid = &lock->v.new.clientid;
2098 struct nfs4_client *clp = sop->so_client;
2102 lkflg = setlkflg(lock->lk_type);
2104 if (lock->lk_is_new) {
2105 if (!sop->so_is_open_owner)
2106 return nfserr_bad_stateid;
2107 if (!same_clid(&clp->cl_clientid, lockclid))
2108 return nfserr_bad_stateid;
2109 /* stp is the open stateid */
2110 status = nfs4_check_openmode(stp, lkflg);
2114 /* stp is the lock stateid */
2115 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2121 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2122 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2123 return nfserr_bad_stateid;
2127 *sopp = sop = stp->st_stateowner;
2130 * We now validate the seqid and stateid generation numbers.
2131 * For the moment, we ignore the possibility of
2132 * generation number wraparound.
2134 if (seqid != sop->so_seqid)
2137 if (sop->so_confirmed && flags & CONFIRM) {
2138 dprintk("NFSD: preprocess_seqid_op: expected"
2139 " unconfirmed stateowner!\n");
2140 return nfserr_bad_stateid;
2142 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2143 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2144 " confirmed yet!\n");
2145 return nfserr_bad_stateid;
2147 if (stateid->si_generation > stp->st_stateid.si_generation) {
2148 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
2149 return nfserr_bad_stateid;
2152 if (stateid->si_generation < stp->st_stateid.si_generation) {
2153 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
2154 return nfserr_old_stateid;
2156 renew_client(sop->so_client);
2160 if (seqid == sop->so_seqid - 1) {
2161 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2162 /* indicate replay to calling function */
2163 return nfserr_replay_me;
2165 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2166 sop->so_seqid, seqid);
2168 return nfserr_bad_seqid;
2172 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2173 struct nfsd4_open_confirm *oc)
2176 struct nfs4_stateowner *sop;
2177 struct nfs4_stateid *stp;
2179 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2180 (int)cstate->current_fh.fh_dentry->d_name.len,
2181 cstate->current_fh.fh_dentry->d_name.name);
2183 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2189 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2190 oc->oc_seqid, &oc->oc_req_stateid,
2191 CHECK_FH | CONFIRM | OPEN_STATE,
2192 &oc->oc_stateowner, &stp, NULL)))
2195 sop = oc->oc_stateowner;
2196 sop->so_confirmed = 1;
2197 update_stateid(&stp->st_stateid);
2198 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2199 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2200 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2201 stp->st_stateid.si_boot,
2202 stp->st_stateid.si_stateownerid,
2203 stp->st_stateid.si_fileid,
2204 stp->st_stateid.si_generation);
2206 nfsd4_create_clid_dir(sop->so_client);
2208 if (oc->oc_stateowner) {
2209 nfs4_get_stateowner(oc->oc_stateowner);
2210 cstate->replay_owner = oc->oc_stateowner;
2212 nfs4_unlock_state();
2218 * unset all bits in union bitmap (bmap) that
2219 * do not exist in share (from successful OPEN_DOWNGRADE)
2222 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2225 for (i = 1; i < 4; i++) {
2226 if ((i & access) != i)
2227 __clear_bit(i, bmap);
2232 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2235 for (i = 0; i < 4; i++) {
2236 if ((i & deny) != i)
2237 __clear_bit(i, bmap);
2242 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2243 struct nfsd4_compound_state *cstate,
2244 struct nfsd4_open_downgrade *od)
2247 struct nfs4_stateid *stp;
2248 unsigned int share_access;
2250 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2251 (int)cstate->current_fh.fh_dentry->d_name.len,
2252 cstate->current_fh.fh_dentry->d_name.name);
2254 if (!access_valid(od->od_share_access)
2255 || !deny_valid(od->od_share_deny))
2256 return nfserr_inval;
2259 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2262 CHECK_FH | OPEN_STATE,
2263 &od->od_stateowner, &stp, NULL)))
2266 status = nfserr_inval;
2267 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2268 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2269 stp->st_access_bmap, od->od_share_access);
2272 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2273 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2274 stp->st_deny_bmap, od->od_share_deny);
2277 set_access(&share_access, stp->st_access_bmap);
2278 nfs4_file_downgrade(stp->st_vfs_file,
2279 share_access & ~od->od_share_access);
2281 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2282 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2284 update_stateid(&stp->st_stateid);
2285 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2288 if (od->od_stateowner) {
2289 nfs4_get_stateowner(od->od_stateowner);
2290 cstate->replay_owner = od->od_stateowner;
2292 nfs4_unlock_state();
2297 * nfs4_unlock_state() called after encode
2300 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2301 struct nfsd4_close *close)
2304 struct nfs4_stateid *stp;
2306 dprintk("NFSD: nfsd4_close on file %.*s\n",
2307 (int)cstate->current_fh.fh_dentry->d_name.len,
2308 cstate->current_fh.fh_dentry->d_name.name);
2311 /* check close_lru for replay */
2312 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2315 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2316 &close->cl_stateowner, &stp, NULL)))
2319 update_stateid(&stp->st_stateid);
2320 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2322 /* release_stateid() calls nfsd_close() if needed */
2323 release_stateid(stp, OPEN_STATE);
2325 /* place unused nfs4_stateowners on so_close_lru list to be
2326 * released by the laundromat service after the lease period
2327 * to enable us to handle CLOSE replay
2329 if (list_empty(&close->cl_stateowner->so_stateids))
2330 move_to_close_lru(close->cl_stateowner);
2332 if (close->cl_stateowner) {
2333 nfs4_get_stateowner(close->cl_stateowner);
2334 cstate->replay_owner = close->cl_stateowner;
2336 nfs4_unlock_state();
2341 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2342 struct nfsd4_delegreturn *dr)
2346 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2350 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2351 &dr->dr_stateid, DELEG_RET, NULL);
2352 nfs4_unlock_state();
2359 * Lock owner state (byte-range locks)
2361 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2362 #define LOCK_HASH_BITS 8
2363 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2364 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2366 #define lockownerid_hashval(id) \
2367 ((id) & LOCK_HASH_MASK)
2369 static inline unsigned int
2370 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2371 struct xdr_netobj *ownername)
2373 return (file_hashval(inode) + cl_id
2374 + opaque_hashval(ownername->data, ownername->len))
2378 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2379 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2380 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2382 static struct nfs4_stateid *
2383 find_stateid(stateid_t *stid, int flags)
2385 struct nfs4_stateid *local = NULL;
2386 u32 st_id = stid->si_stateownerid;
2387 u32 f_id = stid->si_fileid;
2388 unsigned int hashval;
2390 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2391 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2392 hashval = stateid_hashval(st_id, f_id);
2393 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2394 if ((local->st_stateid.si_stateownerid == st_id) &&
2395 (local->st_stateid.si_fileid == f_id))
2399 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2400 hashval = stateid_hashval(st_id, f_id);
2401 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2402 if ((local->st_stateid.si_stateownerid == st_id) &&
2403 (local->st_stateid.si_fileid == f_id))
2410 static struct nfs4_delegation *
2411 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2413 struct nfs4_file *fp;
2414 struct nfs4_delegation *dl;
2416 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2417 stid->si_boot, stid->si_stateownerid,
2418 stid->si_fileid, stid->si_generation);
2420 fp = find_file(ino);
2423 dl = find_delegation_file(fp, stid);
2429 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2430 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2431 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2432 * locking, this prevents us from being completely protocol-compliant. The
2433 * real solution to this problem is to start using unsigned file offsets in
2434 * the VFS, but this is a very deep change!
2437 nfs4_transform_lock_offset(struct file_lock *lock)
2439 if (lock->fl_start < 0)
2440 lock->fl_start = OFFSET_MAX;
2441 if (lock->fl_end < 0)
2442 lock->fl_end = OFFSET_MAX;
2445 /* Hack!: For now, we're defining this just so we can use a pointer to it
2446 * as a unique cookie to identify our (NFSv4's) posix locks. */
2447 static struct lock_manager_operations nfsd_posix_mng_ops = {
2451 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2453 struct nfs4_stateowner *sop;
2456 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2457 sop = (struct nfs4_stateowner *) fl->fl_owner;
2458 hval = lockownerid_hashval(sop->so_id);
2459 kref_get(&sop->so_ref);
2461 deny->ld_clientid = sop->so_client->cl_clientid;
2463 deny->ld_sop = NULL;
2464 deny->ld_clientid.cl_boot = 0;
2465 deny->ld_clientid.cl_id = 0;
2467 deny->ld_start = fl->fl_start;
2468 deny->ld_length = ~(u64)0;
2469 if (fl->fl_end != ~(u64)0)
2470 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2471 deny->ld_type = NFS4_READ_LT;
2472 if (fl->fl_type != F_RDLCK)
2473 deny->ld_type = NFS4_WRITE_LT;
2476 static struct nfs4_stateowner *
2477 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2478 struct xdr_netobj *owner)
2480 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2481 struct nfs4_stateowner *op;
2483 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2484 if (same_owner_str(op, owner, clid))
2491 * Alloc a lock owner structure.
2492 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2495 * strhashval = lock_ownerstr_hashval
2498 static struct nfs4_stateowner *
2499 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2500 struct nfs4_stateowner *sop;
2501 struct nfs4_replay *rp;
2502 unsigned int idhashval;
2504 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2506 idhashval = lockownerid_hashval(current_ownerid);
2507 INIT_LIST_HEAD(&sop->so_idhash);
2508 INIT_LIST_HEAD(&sop->so_strhash);
2509 INIT_LIST_HEAD(&sop->so_perclient);
2510 INIT_LIST_HEAD(&sop->so_stateids);
2511 INIT_LIST_HEAD(&sop->so_perstateid);
2512 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2514 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2515 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2516 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2517 sop->so_is_open_owner = 0;
2518 sop->so_id = current_ownerid++;
2519 sop->so_client = clp;
2520 /* It is the openowner seqid that will be incremented in encode in the
2521 * case of new lockowners; so increment the lock seqid manually: */
2522 sop->so_seqid = lock->lk_new_lock_seqid + 1;
2523 sop->so_confirmed = 1;
2524 rp = &sop->so_replay;
2525 rp->rp_status = nfserr_serverfault;
2527 rp->rp_buf = rp->rp_ibuf;
2531 static struct nfs4_stateid *
2532 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2534 struct nfs4_stateid *stp;
2535 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2537 stp = nfs4_alloc_stateid();
2540 INIT_LIST_HEAD(&stp->st_hash);
2541 INIT_LIST_HEAD(&stp->st_perfile);
2542 INIT_LIST_HEAD(&stp->st_perstateowner);
2543 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2544 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2545 list_add(&stp->st_perfile, &fp->fi_stateids);
2546 list_add(&stp->st_perstateowner, &sop->so_stateids);
2547 stp->st_stateowner = sop;
2550 stp->st_stateid.si_boot = boot_time;
2551 stp->st_stateid.si_stateownerid = sop->so_id;
2552 stp->st_stateid.si_fileid = fp->fi_id;
2553 stp->st_stateid.si_generation = 0;
2554 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2555 stp->st_access_bmap = open_stp->st_access_bmap;
2556 stp->st_deny_bmap = open_stp->st_deny_bmap;
2557 stp->st_openstp = open_stp;
2564 check_lock_length(u64 offset, u64 length)
2566 return ((length == 0) || ((length != ~(u64)0) &&
2567 LOFF_OVERFLOW(offset, length)));
2574 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2575 struct nfsd4_lock *lock)
2577 struct nfs4_stateowner *open_sop = NULL;
2578 struct nfs4_stateowner *lock_sop = NULL;
2579 struct nfs4_stateid *lock_stp;
2581 struct file_lock file_lock;
2582 struct file_lock conflock;
2584 unsigned int strhashval;
2588 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2589 (long long) lock->lk_offset,
2590 (long long) lock->lk_length);
2592 if (check_lock_length(lock->lk_offset, lock->lk_length))
2593 return nfserr_inval;
2595 if ((status = fh_verify(rqstp, &cstate->current_fh,
2596 S_IFREG, MAY_LOCK))) {
2597 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2603 if (lock->lk_is_new) {
2605 * Client indicates that this is a new lockowner.
2606 * Use open owner and open stateid to create lock owner and
2609 struct nfs4_stateid *open_stp = NULL;
2610 struct nfs4_file *fp;
2612 status = nfserr_stale_clientid;
2613 if (STALE_CLIENTID(&lock->lk_new_clientid))
2616 /* validate and update open stateid and open seqid */
2617 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2618 lock->lk_new_open_seqid,
2619 &lock->lk_new_open_stateid,
2620 CHECK_FH | OPEN_STATE,
2621 &lock->lk_replay_owner, &open_stp,
2625 open_sop = lock->lk_replay_owner;
2626 /* create lockowner and lock stateid */
2627 fp = open_stp->st_file;
2628 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2629 open_sop->so_client->cl_clientid.cl_id,
2630 &lock->v.new.owner);
2631 /* XXX: Do we need to check for duplicate stateowners on
2632 * the same file, or should they just be allowed (and
2633 * create new stateids)? */
2634 status = nfserr_resource;
2635 lock_sop = alloc_init_lock_stateowner(strhashval,
2636 open_sop->so_client, open_stp, lock);
2637 if (lock_sop == NULL)
2639 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2640 if (lock_stp == NULL)
2643 /* lock (lock owner + lock stateid) already exists */
2644 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2645 lock->lk_old_lock_seqid,
2646 &lock->lk_old_lock_stateid,
2647 CHECK_FH | LOCK_STATE,
2648 &lock->lk_replay_owner, &lock_stp, lock);
2651 lock_sop = lock->lk_replay_owner;
2653 /* lock->lk_replay_owner and lock_stp have been created or found */
2654 filp = lock_stp->st_vfs_file;
2656 status = nfserr_grace;
2657 if (nfs4_in_grace() && !lock->lk_reclaim)
2659 status = nfserr_no_grace;
2660 if (!nfs4_in_grace() && lock->lk_reclaim)
2663 locks_init_lock(&file_lock);
2664 switch (lock->lk_type) {
2667 file_lock.fl_type = F_RDLCK;
2671 case NFS4_WRITEW_LT:
2672 file_lock.fl_type = F_WRLCK;
2676 status = nfserr_inval;
2679 file_lock.fl_owner = (fl_owner_t)lock_sop;
2680 file_lock.fl_pid = current->tgid;
2681 file_lock.fl_file = filp;
2682 file_lock.fl_flags = FL_POSIX;
2683 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2685 file_lock.fl_start = lock->lk_offset;
2686 if ((lock->lk_length == ~(u64)0) ||
2687 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2688 file_lock.fl_end = ~(u64)0;
2690 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2691 nfs4_transform_lock_offset(&file_lock);
2694 * Try to lock the file in the VFS.
2695 * Note: locks.c uses the BKL to protect the inode's lock list.
2698 /* XXX?: Just to divert the locks_release_private at the start of
2699 * locks_copy_lock: */
2700 locks_init_lock(&conflock);
2701 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2703 case 0: /* success! */
2704 update_stateid(&lock_stp->st_stateid);
2705 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2709 case (EAGAIN): /* conflock holds conflicting lock */
2710 status = nfserr_denied;
2711 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2712 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2715 status = nfserr_deadlock;
2718 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2719 status = nfserr_resource;
2723 if (status && lock->lk_is_new && lock_sop)
2724 release_stateowner(lock_sop);
2725 if (lock->lk_replay_owner) {
2726 nfs4_get_stateowner(lock->lk_replay_owner);
2727 cstate->replay_owner = lock->lk_replay_owner;
2729 nfs4_unlock_state();
2737 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2738 struct nfsd4_lockt *lockt)
2740 struct inode *inode;
2742 struct file_lock file_lock;
2746 if (nfs4_in_grace())
2747 return nfserr_grace;
2749 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2750 return nfserr_inval;
2752 lockt->lt_stateowner = NULL;
2755 status = nfserr_stale_clientid;
2756 if (STALE_CLIENTID(&lockt->lt_clientid))
2759 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2760 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2761 if (status == nfserr_symlink)
2762 status = nfserr_inval;
2766 inode = cstate->current_fh.fh_dentry->d_inode;
2767 locks_init_lock(&file_lock);
2768 switch (lockt->lt_type) {
2771 file_lock.fl_type = F_RDLCK;
2774 case NFS4_WRITEW_LT:
2775 file_lock.fl_type = F_WRLCK;
2778 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2779 status = nfserr_inval;
2783 lockt->lt_stateowner = find_lockstateowner_str(inode,
2784 &lockt->lt_clientid, &lockt->lt_owner);
2785 if (lockt->lt_stateowner)
2786 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2787 file_lock.fl_pid = current->tgid;
2788 file_lock.fl_flags = FL_POSIX;
2789 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2791 file_lock.fl_start = lockt->lt_offset;
2792 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2793 file_lock.fl_end = ~(u64)0;
2795 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2797 nfs4_transform_lock_offset(&file_lock);
2799 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2800 * since LOCKT doesn't require an OPEN, and therefore a struct
2801 * file may not exist, pass vfs_test_lock a struct file with
2802 * only the dentry:inode set.
2804 memset(&file, 0, sizeof (struct file));
2805 file.f_path.dentry = cstate->current_fh.fh_dentry;
2808 error = vfs_test_lock(&file, &file_lock);
2810 status = nfserrno(error);
2813 if (file_lock.fl_type != F_UNLCK) {
2814 status = nfserr_denied;
2815 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2818 nfs4_unlock_state();
2823 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2824 struct nfsd4_locku *locku)
2826 struct nfs4_stateid *stp;
2827 struct file *filp = NULL;
2828 struct file_lock file_lock;
2832 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2833 (long long) locku->lu_offset,
2834 (long long) locku->lu_length);
2836 if (check_lock_length(locku->lu_offset, locku->lu_length))
2837 return nfserr_inval;
2841 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2844 CHECK_FH | LOCK_STATE,
2845 &locku->lu_stateowner, &stp, NULL)))
2848 filp = stp->st_vfs_file;
2850 locks_init_lock(&file_lock);
2851 file_lock.fl_type = F_UNLCK;
2852 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2853 file_lock.fl_pid = current->tgid;
2854 file_lock.fl_file = filp;
2855 file_lock.fl_flags = FL_POSIX;
2856 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2857 file_lock.fl_start = locku->lu_offset;
2859 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2860 file_lock.fl_end = ~(u64)0;
2862 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2863 nfs4_transform_lock_offset(&file_lock);
2866 * Try to unlock the file in the VFS.
2868 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2870 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2874 * OK, unlock succeeded; the only thing left to do is update the stateid.
2876 update_stateid(&stp->st_stateid);
2877 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2880 if (locku->lu_stateowner) {
2881 nfs4_get_stateowner(locku->lu_stateowner);
2882 cstate->replay_owner = locku->lu_stateowner;
2884 nfs4_unlock_state();
2888 status = nfserrno(err);
2894 * 1: locks held by lockowner
2895 * 0: no locks held by lockowner
2898 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2900 struct file_lock **flpp;
2901 struct inode *inode = filp->f_path.dentry->d_inode;
2905 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2906 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2917 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2918 struct nfsd4_compound_state *cstate,
2919 struct nfsd4_release_lockowner *rlockowner)
2921 clientid_t *clid = &rlockowner->rl_clientid;
2922 struct nfs4_stateowner *sop;
2923 struct nfs4_stateid *stp;
2924 struct xdr_netobj *owner = &rlockowner->rl_owner;
2925 struct list_head matches;
2929 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2930 clid->cl_boot, clid->cl_id);
2932 /* XXX check for lease expiration */
2934 status = nfserr_stale_clientid;
2935 if (STALE_CLIENTID(clid))
2940 status = nfserr_locks_held;
2941 /* XXX: we're doing a linear search through all the lockowners.
2942 * Yipes! For now we'll just hope clients aren't really using
2943 * release_lockowner much, but eventually we have to fix these
2944 * data structures. */
2945 INIT_LIST_HEAD(&matches);
2946 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2947 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2948 if (!same_owner_str(sop, owner, clid))
2950 list_for_each_entry(stp, &sop->so_stateids,
2952 if (check_for_locks(stp->st_vfs_file, sop))
2954 /* Note: so_perclient unused for lockowners,
2955 * so it's OK to fool with here. */
2956 list_add(&sop->so_perclient, &matches);
2960 /* Clients probably won't expect us to return with some (but not all)
2961 * of the lockowner state released; so don't release any until all
2962 * have been checked. */
2964 while (!list_empty(&matches)) {
2965 sop = list_entry(matches.next, struct nfs4_stateowner,
2967 /* unhash_stateowner deletes so_perclient only
2968 * for openowners. */
2969 list_del(&sop->so_perclient);
2970 release_stateowner(sop);
2973 nfs4_unlock_state();
2977 static inline struct nfs4_client_reclaim *
2980 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
2984 nfs4_has_reclaimed_state(const char *name)
2986 unsigned int strhashval = clientstr_hashval(name);
2987 struct nfs4_client *clp;
2989 clp = find_confirmed_client_by_str(name, strhashval);
2994 * failure => all reset bets are off, nfserr_no_grace...
2997 nfs4_client_to_reclaim(const char *name)
2999 unsigned int strhashval;
3000 struct nfs4_client_reclaim *crp = NULL;
3002 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3003 crp = alloc_reclaim();
3006 strhashval = clientstr_hashval(name);
3007 INIT_LIST_HEAD(&crp->cr_strhash);
3008 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3009 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3010 reclaim_str_hashtbl_size++;
3015 nfs4_release_reclaim(void)
3017 struct nfs4_client_reclaim *crp = NULL;
3020 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3021 while (!list_empty(&reclaim_str_hashtbl[i])) {
3022 crp = list_entry(reclaim_str_hashtbl[i].next,
3023 struct nfs4_client_reclaim, cr_strhash);
3024 list_del(&crp->cr_strhash);
3026 reclaim_str_hashtbl_size--;
3029 BUG_ON(reclaim_str_hashtbl_size);
3033 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3034 static struct nfs4_client_reclaim *
3035 nfs4_find_reclaim_client(clientid_t *clid)
3037 unsigned int strhashval;
3038 struct nfs4_client *clp;
3039 struct nfs4_client_reclaim *crp = NULL;
3042 /* find clientid in conf_id_hashtbl */
3043 clp = find_confirmed_client(clid);
3047 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3048 clp->cl_name.len, clp->cl_name.data,
3051 /* find clp->cl_name in reclaim_str_hashtbl */
3052 strhashval = clientstr_hashval(clp->cl_recdir);
3053 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3054 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3062 * Called from OPEN. Look for clientid in reclaim list.
3065 nfs4_check_open_reclaim(clientid_t *clid)
3067 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3070 /* initialization to perform at module load time: */
3073 nfs4_state_init(void)
3077 status = nfsd4_init_slabs();
3080 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3081 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3082 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3083 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3084 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3086 for (i = 0; i < FILE_HASH_SIZE; i++) {
3087 INIT_LIST_HEAD(&file_hashtbl[i]);
3089 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3090 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3091 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3093 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3094 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3095 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3097 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3098 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3099 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3101 memset(&onestateid, ~0, sizeof(stateid_t));
3102 INIT_LIST_HEAD(&close_lru);
3103 INIT_LIST_HEAD(&client_lru);
3104 INIT_LIST_HEAD(&del_recall_lru);
3105 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3106 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3107 reclaim_str_hashtbl_size = 0;
3112 nfsd4_load_reboot_recovery_data(void)
3117 nfsd4_init_recdir(user_recovery_dirname);
3118 status = nfsd4_recdir_load();
3119 nfs4_unlock_state();
3121 printk("NFSD: Failure reading reboot recovery data\n");
3125 get_nfs4_grace_period(void)
3127 return max(user_lease_time, lease_time) * HZ;
3131 * Since the lifetime of a delegation isn't limited to that of an open, a
3132 * client may quite reasonably hang on to a delegation as long as it has
3133 * the inode cached. This becomes an obvious problem the first time a
3134 * client's inode cache approaches the size of the server's total memory.
3136 * For now we avoid this problem by imposing a hard limit on the number
3137 * of delegations, which varies according to the server's memory size.
3140 set_max_delegations(void)
3143 * Allow at most 4 delegations per megabyte of RAM. Quick
3144 * estimates suggest that in the worst case (where every delegation
3145 * is for a different inode), a delegation could take about 1.5K,
3146 * giving a worst case usage of about 6% of memory.
3148 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3151 /* initialization to perform when the nfsd service is started: */
3154 __nfs4_state_start(void)
3156 unsigned long grace_time;
3158 boot_time = get_seconds();
3159 grace_time = get_nfs_grace_period();
3160 lease_time = user_lease_time;
3162 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3164 laundry_wq = create_singlethread_workqueue("nfsd4");
3165 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3166 set_max_delegations();
3170 nfs4_state_start(void)
3174 nfsd4_load_reboot_recovery_data();
3175 __nfs4_state_start();
3187 nfs4_lease_time(void)
3193 __nfs4_state_shutdown(void)
3196 struct nfs4_client *clp = NULL;
3197 struct nfs4_delegation *dp = NULL;
3198 struct list_head *pos, *next, reaplist;
3200 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3201 while (!list_empty(&conf_id_hashtbl[i])) {
3202 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3205 while (!list_empty(&unconf_str_hashtbl[i])) {
3206 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3210 INIT_LIST_HEAD(&reaplist);
3211 spin_lock(&recall_lock);
3212 list_for_each_safe(pos, next, &del_recall_lru) {
3213 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3214 list_move(&dp->dl_recall_lru, &reaplist);
3216 spin_unlock(&recall_lock);
3217 list_for_each_safe(pos, next, &reaplist) {
3218 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3219 list_del_init(&dp->dl_recall_lru);
3220 unhash_delegation(dp);
3223 nfsd4_shutdown_recdir();
3228 nfs4_state_shutdown(void)
3230 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3231 destroy_workqueue(laundry_wq);
3233 nfs4_release_reclaim();
3234 __nfs4_state_shutdown();
3235 nfs4_unlock_state();
3239 nfs4_set_recdir(char *recdir)
3242 strcpy(user_recovery_dirname, recdir);
3243 nfs4_unlock_state();
3247 * Change the NFSv4 recovery directory to recdir.
3250 nfs4_reset_recoverydir(char *recdir)
3253 struct nameidata nd;
3255 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3259 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3260 nfs4_set_recdir(recdir);
3268 * Called when leasetime is changed.
3270 * The only way the protocol gives us to handle on-the-fly lease changes is to
3271 * simulate a reboot. Instead of doing that, we just wait till the next time
3272 * we start to register any changes in lease time. If the administrator
3273 * really wants to change the lease time *now*, they can go ahead and bring
3274 * nfsd down and then back up again after changing the lease time.
3277 nfs4_reset_lease(time_t leasetime)
3280 user_lease_time = leasetime;