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_ownerid = 1;
65 static u32 current_fileid = 1;
66 static u32 current_delegid = 1;
68 static stateid_t zerostateid; /* bits all 0 */
69 static stateid_t onestateid; /* bits all 1 */
71 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
72 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
74 /* forward declarations */
75 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
76 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
77 static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
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;
119 /* forward declarations */
120 static void release_stateowner(struct nfs4_stateowner *sop);
121 static void release_stateid(struct nfs4_stateid *stp, int flags);
127 /* recall_lock protects the del_recall_lru */
128 static DEFINE_SPINLOCK(recall_lock);
129 static struct list_head del_recall_lru;
132 free_nfs4_file(struct kref *kref)
134 struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
135 list_del(&fp->fi_hash);
137 kmem_cache_free(file_slab, fp);
141 put_nfs4_file(struct nfs4_file *fi)
143 kref_put(&fi->fi_ref, free_nfs4_file);
147 get_nfs4_file(struct nfs4_file *fi)
149 kref_get(&fi->fi_ref);
152 static int num_delegations;
153 unsigned int max_delegations;
156 * Open owner state (share locks)
159 /* hash tables for nfs4_stateowner */
160 #define OWNER_HASH_BITS 8
161 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
162 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
164 #define ownerid_hashval(id) \
165 ((id) & OWNER_HASH_MASK)
166 #define ownerstr_hashval(clientid, ownername) \
167 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
169 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
170 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
172 /* hash table for nfs4_file */
173 #define FILE_HASH_BITS 8
174 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
175 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
176 /* hash table for (open)nfs4_stateid */
177 #define STATEID_HASH_BITS 10
178 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
179 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
181 #define file_hashval(x) \
182 hash_ptr(x, FILE_HASH_BITS)
183 #define stateid_hashval(owner_id, file_id) \
184 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
186 static struct list_head file_hashtbl[FILE_HASH_SIZE];
187 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
189 static struct nfs4_delegation *
190 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
192 struct nfs4_delegation *dp;
193 struct nfs4_file *fp = stp->st_file;
194 struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
196 dprintk("NFSD alloc_init_deleg\n");
197 if (fp->fi_had_conflict)
199 if (num_delegations > max_delegations)
201 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
205 INIT_LIST_HEAD(&dp->dl_perfile);
206 INIT_LIST_HEAD(&dp->dl_perclnt);
207 INIT_LIST_HEAD(&dp->dl_recall_lru);
212 get_file(stp->st_vfs_file);
213 dp->dl_vfs_file = stp->st_vfs_file;
215 dp->dl_recall.cbr_dp = NULL;
216 dp->dl_recall.cbr_ident = cb->cb_ident;
217 dp->dl_recall.cbr_trunc = 0;
218 dp->dl_stateid.si_boot = boot_time;
219 dp->dl_stateid.si_stateownerid = current_delegid++;
220 dp->dl_stateid.si_fileid = 0;
221 dp->dl_stateid.si_generation = 0;
222 dp->dl_fhlen = current_fh->fh_handle.fh_size;
223 memcpy(dp->dl_fhval, ¤t_fh->fh_handle.fh_base,
224 current_fh->fh_handle.fh_size);
226 atomic_set(&dp->dl_count, 1);
227 list_add(&dp->dl_perfile, &fp->fi_delegations);
228 list_add(&dp->dl_perclnt, &clp->cl_delegations);
233 nfs4_put_delegation(struct nfs4_delegation *dp)
235 if (atomic_dec_and_test(&dp->dl_count)) {
236 dprintk("NFSD: freeing dp %p\n",dp);
237 put_nfs4_file(dp->dl_file);
238 kmem_cache_free(deleg_slab, dp);
243 /* Remove the associated file_lock first, then remove the delegation.
244 * lease_modify() is called to remove the FS_LEASE file_lock from
245 * the i_flock list, eventually calling nfsd's lock_manager
246 * fl_release_callback.
249 nfs4_close_delegation(struct nfs4_delegation *dp)
251 struct file *filp = dp->dl_vfs_file;
253 dprintk("NFSD: close_delegation dp %p\n",dp);
254 dp->dl_vfs_file = NULL;
255 /* The following nfsd_close may not actually close the file,
256 * but we want to remove the lease in any case. */
258 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
262 /* Called under the state lock. */
264 unhash_delegation(struct nfs4_delegation *dp)
266 list_del_init(&dp->dl_perfile);
267 list_del_init(&dp->dl_perclnt);
268 spin_lock(&recall_lock);
269 list_del_init(&dp->dl_recall_lru);
270 spin_unlock(&recall_lock);
271 nfs4_close_delegation(dp);
272 nfs4_put_delegation(dp);
279 /* Hash tables for nfs4_clientid state */
280 #define CLIENT_HASH_BITS 4
281 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
282 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
284 #define clientid_hashval(id) \
285 ((id) & CLIENT_HASH_MASK)
286 #define clientstr_hashval(name) \
287 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
289 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
290 * used in reboot/reset lease grace period processing
292 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
293 * setclientid_confirmed info.
295 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
298 * client_lru holds client queue ordered by nfs4_client.cl_time
301 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
302 * for last close replay.
304 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
305 static int reclaim_str_hashtbl_size = 0;
306 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
307 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
308 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
309 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
310 static struct list_head client_lru;
311 static struct list_head close_lru;
314 renew_client(struct nfs4_client *clp)
317 * Move client to the end to the LRU list.
319 dprintk("renewing client (clientid %08x/%08x)\n",
320 clp->cl_clientid.cl_boot,
321 clp->cl_clientid.cl_id);
322 list_move_tail(&clp->cl_lru, &client_lru);
323 clp->cl_time = get_seconds();
326 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
328 STALE_CLIENTID(clientid_t *clid)
330 if (clid->cl_boot == boot_time)
332 dprintk("NFSD stale clientid (%08x/%08x)\n",
333 clid->cl_boot, clid->cl_id);
338 * XXX Should we use a slab cache ?
339 * This type of memory management is somewhat inefficient, but we use it
340 * anyway since SETCLIENTID is not a common operation.
342 static struct nfs4_client *alloc_client(struct xdr_netobj name)
344 struct nfs4_client *clp;
346 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
349 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
350 if (clp->cl_name.data == NULL) {
354 memcpy(clp->cl_name.data, name.data, name.len);
355 clp->cl_name.len = name.len;
360 shutdown_callback_client(struct nfs4_client *clp)
362 struct rpc_clnt *clnt = clp->cl_callback.cb_client;
364 /* shutdown rpc client, ending any outstanding recall rpcs */
366 clp->cl_callback.cb_client = NULL;
367 rpc_shutdown_client(clnt);
372 free_client(struct nfs4_client *clp)
374 shutdown_callback_client(clp);
375 if (clp->cl_cred.cr_group_info)
376 put_group_info(clp->cl_cred.cr_group_info);
377 kfree(clp->cl_name.data);
382 put_nfs4_client(struct nfs4_client *clp)
384 if (atomic_dec_and_test(&clp->cl_count))
389 expire_client(struct nfs4_client *clp)
391 struct nfs4_stateowner *sop;
392 struct nfs4_delegation *dp;
393 struct list_head reaplist;
395 dprintk("NFSD: expire_client cl_count %d\n",
396 atomic_read(&clp->cl_count));
398 INIT_LIST_HEAD(&reaplist);
399 spin_lock(&recall_lock);
400 while (!list_empty(&clp->cl_delegations)) {
401 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
402 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
404 list_del_init(&dp->dl_perclnt);
405 list_move(&dp->dl_recall_lru, &reaplist);
407 spin_unlock(&recall_lock);
408 while (!list_empty(&reaplist)) {
409 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
410 list_del_init(&dp->dl_recall_lru);
411 unhash_delegation(dp);
413 list_del(&clp->cl_idhash);
414 list_del(&clp->cl_strhash);
415 list_del(&clp->cl_lru);
416 while (!list_empty(&clp->cl_openowners)) {
417 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
418 release_stateowner(sop);
420 put_nfs4_client(clp);
423 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
425 struct nfs4_client *clp;
427 clp = alloc_client(name);
430 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
431 atomic_set(&clp->cl_count, 1);
432 atomic_set(&clp->cl_callback.cb_set, 0);
433 INIT_LIST_HEAD(&clp->cl_idhash);
434 INIT_LIST_HEAD(&clp->cl_strhash);
435 INIT_LIST_HEAD(&clp->cl_openowners);
436 INIT_LIST_HEAD(&clp->cl_delegations);
437 INIT_LIST_HEAD(&clp->cl_lru);
441 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
443 memcpy(target->cl_verifier.data, source->data,
444 sizeof(target->cl_verifier.data));
447 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
449 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
450 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
453 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
455 target->cr_uid = source->cr_uid;
456 target->cr_gid = source->cr_gid;
457 target->cr_group_info = source->cr_group_info;
458 get_group_info(target->cr_group_info);
461 static int same_name(const char *n1, const char *n2)
463 return 0 == memcmp(n1, n2, HEXDIR_LEN);
467 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
469 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
473 same_clid(clientid_t *cl1, clientid_t *cl2)
475 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
478 /* XXX what about NGROUP */
480 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
482 return cr1->cr_uid == cr2->cr_uid;
485 static void gen_clid(struct nfs4_client *clp)
487 static u32 current_clientid = 1;
489 clp->cl_clientid.cl_boot = boot_time;
490 clp->cl_clientid.cl_id = current_clientid++;
493 static void gen_confirm(struct nfs4_client *clp)
498 p = (u32 *)clp->cl_confirm.data;
499 *p++ = get_seconds();
503 static int check_name(struct xdr_netobj name)
507 if (name.len > NFS4_OPAQUE_LIMIT) {
508 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
515 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
517 unsigned int idhashval;
519 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
520 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
521 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
522 list_add_tail(&clp->cl_lru, &client_lru);
523 clp->cl_time = get_seconds();
527 move_to_confirmed(struct nfs4_client *clp)
529 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
530 unsigned int strhashval;
532 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
533 list_del_init(&clp->cl_strhash);
534 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
535 strhashval = clientstr_hashval(clp->cl_recdir);
536 list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
540 static struct nfs4_client *
541 find_confirmed_client(clientid_t *clid)
543 struct nfs4_client *clp;
544 unsigned int idhashval = clientid_hashval(clid->cl_id);
546 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
547 if (same_clid(&clp->cl_clientid, clid))
553 static struct nfs4_client *
554 find_unconfirmed_client(clientid_t *clid)
556 struct nfs4_client *clp;
557 unsigned int idhashval = clientid_hashval(clid->cl_id);
559 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
560 if (same_clid(&clp->cl_clientid, clid))
566 static struct nfs4_client *
567 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
569 struct nfs4_client *clp;
571 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
572 if (same_name(clp->cl_recdir, dname))
578 static struct nfs4_client *
579 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
581 struct nfs4_client *clp;
583 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
584 if (same_name(clp->cl_recdir, dname))
590 /* a helper function for parse_callback */
592 parse_octet(unsigned int *lenp, char **addrp)
594 unsigned int len = *lenp;
606 if ((c < '0') || (c > '9')) {
612 n = (n * 10) + (c - '0');
623 /* parse and set the setclientid ipv4 callback address */
625 parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
630 u32 addrlen = addr_len;
631 char *addr = addr_val;
636 for(i = 4; i > 0 ; i--) {
637 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
640 cbaddr |= (temp << shift);
648 for(i = 2; i > 0 ; i--) {
649 if ((temp = parse_octet(&addrlen, &addr)) < 0) {
652 cbport |= (temp << shift);
661 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
663 struct nfs4_callback *cb = &clp->cl_callback;
665 /* Currently, we only support tcp for the callback channel */
666 if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
669 if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
670 &cb->cb_addr, &cb->cb_port)))
672 cb->cb_prog = se->se_callback_prog;
673 cb->cb_ident = se->se_callback_ident;
676 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
677 "will not receive delegations\n",
678 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
684 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
685 struct nfsd4_setclientid *setclid)
687 struct sockaddr_in *sin = svc_addr_in(rqstp);
688 struct xdr_netobj clname = {
689 .len = setclid->se_namelen,
690 .data = setclid->se_name,
692 nfs4_verifier clverifier = setclid->se_verf;
693 unsigned int strhashval;
694 struct nfs4_client *conf, *unconf, *new;
696 char dname[HEXDIR_LEN];
698 if (!check_name(clname))
701 status = nfs4_make_rec_clidname(dname, &clname);
706 * XXX The Duplicate Request Cache (DRC) has been checked (??)
707 * We get here on a DRC miss.
710 strhashval = clientstr_hashval(dname);
713 conf = find_confirmed_client_by_str(dname, strhashval);
715 /* RFC 3530 14.2.33 CASE 0: */
716 status = nfserr_clid_inuse;
717 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
718 || conf->cl_addr != sin->sin_addr.s_addr) {
719 dprintk("NFSD: setclientid: string in use by client"
720 "at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
725 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
726 * has a description of SETCLIENTID request processing consisting
727 * of 5 bullet points, labeled as CASE0 - CASE4 below.
729 unconf = find_unconfirmed_client_by_str(dname, strhashval);
730 status = nfserr_resource;
733 * RFC 3530 14.2.33 CASE 4:
734 * placed first, because it is the normal case
737 expire_client(unconf);
738 new = create_client(clname, dname);
742 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
744 * RFC 3530 14.2.33 CASE 1:
745 * probable callback update
748 /* Note this is removing unconfirmed {*x***},
749 * which is stronger than RFC recommended {vxc**}.
750 * This has the advantage that there is at most
751 * one {*x***} in either list at any time.
753 expire_client(unconf);
755 new = create_client(clname, dname);
758 copy_clid(new, conf);
759 } else if (!unconf) {
761 * RFC 3530 14.2.33 CASE 2:
762 * probable client reboot; state will be removed if
765 new = create_client(clname, dname);
771 * RFC 3530 14.2.33 CASE 3:
772 * probable client reboot; state will be removed if
775 expire_client(unconf);
776 new = create_client(clname, dname);
781 copy_verf(new, &clverifier);
782 new->cl_addr = sin->sin_addr.s_addr;
783 copy_cred(&new->cl_cred, &rqstp->rq_cred);
785 gen_callback(new, setclid);
786 add_to_unconfirmed(new, strhashval);
787 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
788 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
789 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
798 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
799 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
800 * bullets, labeled as CASE1 - CASE4 below.
803 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
804 struct nfsd4_compound_state *cstate,
805 struct nfsd4_setclientid_confirm *setclientid_confirm)
807 struct sockaddr_in *sin = svc_addr_in(rqstp);
808 struct nfs4_client *conf, *unconf;
809 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
810 clientid_t * clid = &setclientid_confirm->sc_clientid;
813 if (STALE_CLIENTID(clid))
814 return nfserr_stale_clientid;
816 * XXX The Duplicate Request Cache (DRC) has been checked (??)
817 * We get here on a DRC miss.
822 conf = find_confirmed_client(clid);
823 unconf = find_unconfirmed_client(clid);
825 status = nfserr_clid_inuse;
826 if (conf && conf->cl_addr != sin->sin_addr.s_addr)
828 if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
832 * section 14.2.34 of RFC 3530 has a description of
833 * SETCLIENTID_CONFIRM request processing consisting
834 * of 4 bullet points, labeled as CASE1 - CASE4 below.
836 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
838 * RFC 3530 14.2.34 CASE 1:
841 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
842 status = nfserr_clid_inuse;
844 /* XXX: We just turn off callbacks until we can handle
845 * change request correctly. */
846 atomic_set(&conf->cl_callback.cb_set, 0);
848 nfsd4_remove_clid_dir(unconf);
849 expire_client(unconf);
853 } else if (conf && !unconf) {
855 * RFC 3530 14.2.34 CASE 2:
856 * probable retransmitted request; play it safe and
859 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
860 status = nfserr_clid_inuse;
863 } else if (!conf && unconf
864 && same_verf(&unconf->cl_confirm, &confirm)) {
866 * RFC 3530 14.2.34 CASE 3:
867 * Normal case; new or rebooted client:
869 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
870 status = nfserr_clid_inuse;
873 clientstr_hashval(unconf->cl_recdir);
874 conf = find_confirmed_client_by_str(unconf->cl_recdir,
877 nfsd4_remove_clid_dir(conf);
880 move_to_confirmed(unconf);
882 nfsd4_probe_callback(conf);
885 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
886 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
889 * RFC 3530 14.2.34 CASE 4:
890 * Client probably hasn't noticed that we rebooted yet.
892 status = nfserr_stale_clientid;
894 /* check that we have hit one of the cases...*/
895 status = nfserr_clid_inuse;
902 /* OPEN Share state helper functions */
903 static inline struct nfs4_file *
904 alloc_init_file(struct inode *ino)
906 struct nfs4_file *fp;
907 unsigned int hashval = file_hashval(ino);
909 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
911 kref_init(&fp->fi_ref);
912 INIT_LIST_HEAD(&fp->fi_hash);
913 INIT_LIST_HEAD(&fp->fi_stateids);
914 INIT_LIST_HEAD(&fp->fi_delegations);
915 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
916 fp->fi_inode = igrab(ino);
917 fp->fi_id = current_fileid++;
918 fp->fi_had_conflict = false;
925 nfsd4_free_slab(struct kmem_cache **slab)
929 kmem_cache_destroy(*slab);
934 nfsd4_free_slabs(void)
936 nfsd4_free_slab(&stateowner_slab);
937 nfsd4_free_slab(&file_slab);
938 nfsd4_free_slab(&stateid_slab);
939 nfsd4_free_slab(&deleg_slab);
943 nfsd4_init_slabs(void)
945 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
946 sizeof(struct nfs4_stateowner), 0, 0, NULL);
947 if (stateowner_slab == NULL)
949 file_slab = kmem_cache_create("nfsd4_files",
950 sizeof(struct nfs4_file), 0, 0, NULL);
951 if (file_slab == NULL)
953 stateid_slab = kmem_cache_create("nfsd4_stateids",
954 sizeof(struct nfs4_stateid), 0, 0, NULL);
955 if (stateid_slab == NULL)
957 deleg_slab = kmem_cache_create("nfsd4_delegations",
958 sizeof(struct nfs4_delegation), 0, 0, NULL);
959 if (deleg_slab == NULL)
964 dprintk("nfsd4: out of memory while initializing nfsv4\n");
969 nfs4_free_stateowner(struct kref *kref)
971 struct nfs4_stateowner *sop =
972 container_of(kref, struct nfs4_stateowner, so_ref);
973 kfree(sop->so_owner.data);
974 kmem_cache_free(stateowner_slab, sop);
977 static inline struct nfs4_stateowner *
978 alloc_stateowner(struct xdr_netobj *owner)
980 struct nfs4_stateowner *sop;
982 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
983 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
984 memcpy(sop->so_owner.data, owner->data, owner->len);
985 sop->so_owner.len = owner->len;
986 kref_init(&sop->so_ref);
989 kmem_cache_free(stateowner_slab, sop);
994 static struct nfs4_stateowner *
995 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
996 struct nfs4_stateowner *sop;
997 struct nfs4_replay *rp;
998 unsigned int idhashval;
1000 if (!(sop = alloc_stateowner(&open->op_owner)))
1002 idhashval = ownerid_hashval(current_ownerid);
1003 INIT_LIST_HEAD(&sop->so_idhash);
1004 INIT_LIST_HEAD(&sop->so_strhash);
1005 INIT_LIST_HEAD(&sop->so_perclient);
1006 INIT_LIST_HEAD(&sop->so_stateids);
1007 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1008 INIT_LIST_HEAD(&sop->so_close_lru);
1010 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1011 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1012 list_add(&sop->so_perclient, &clp->cl_openowners);
1013 sop->so_is_open_owner = 1;
1014 sop->so_id = current_ownerid++;
1015 sop->so_client = clp;
1016 sop->so_seqid = open->op_seqid;
1017 sop->so_confirmed = 0;
1018 rp = &sop->so_replay;
1019 rp->rp_status = nfserr_serverfault;
1021 rp->rp_buf = rp->rp_ibuf;
1026 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1028 struct nfs4_stateowner *lock_sop;
1030 while (!list_empty(&open_stp->st_lockowners)) {
1031 lock_sop = list_entry(open_stp->st_lockowners.next,
1032 struct nfs4_stateowner, so_perstateid);
1033 /* list_del(&open_stp->st_lockowners); */
1034 BUG_ON(lock_sop->so_is_open_owner);
1035 release_stateowner(lock_sop);
1040 unhash_stateowner(struct nfs4_stateowner *sop)
1042 struct nfs4_stateid *stp;
1044 list_del(&sop->so_idhash);
1045 list_del(&sop->so_strhash);
1046 if (sop->so_is_open_owner)
1047 list_del(&sop->so_perclient);
1048 list_del(&sop->so_perstateid);
1049 while (!list_empty(&sop->so_stateids)) {
1050 stp = list_entry(sop->so_stateids.next,
1051 struct nfs4_stateid, st_perstateowner);
1052 if (sop->so_is_open_owner)
1053 release_stateid(stp, OPEN_STATE);
1055 release_stateid(stp, LOCK_STATE);
1060 release_stateowner(struct nfs4_stateowner *sop)
1062 unhash_stateowner(sop);
1063 list_del(&sop->so_close_lru);
1064 nfs4_put_stateowner(sop);
1068 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1069 struct nfs4_stateowner *sop = open->op_stateowner;
1070 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1072 INIT_LIST_HEAD(&stp->st_hash);
1073 INIT_LIST_HEAD(&stp->st_perstateowner);
1074 INIT_LIST_HEAD(&stp->st_lockowners);
1075 INIT_LIST_HEAD(&stp->st_perfile);
1076 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1077 list_add(&stp->st_perstateowner, &sop->so_stateids);
1078 list_add(&stp->st_perfile, &fp->fi_stateids);
1079 stp->st_stateowner = sop;
1082 stp->st_stateid.si_boot = boot_time;
1083 stp->st_stateid.si_stateownerid = sop->so_id;
1084 stp->st_stateid.si_fileid = fp->fi_id;
1085 stp->st_stateid.si_generation = 0;
1086 stp->st_access_bmap = 0;
1087 stp->st_deny_bmap = 0;
1088 __set_bit(open->op_share_access, &stp->st_access_bmap);
1089 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1090 stp->st_openstp = NULL;
1094 release_stateid(struct nfs4_stateid *stp, int flags)
1096 struct file *filp = stp->st_vfs_file;
1098 list_del(&stp->st_hash);
1099 list_del(&stp->st_perfile);
1100 list_del(&stp->st_perstateowner);
1101 if (flags & OPEN_STATE) {
1102 release_stateid_lockowners(stp);
1103 stp->st_vfs_file = NULL;
1105 } else if (flags & LOCK_STATE)
1106 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1107 put_nfs4_file(stp->st_file);
1108 kmem_cache_free(stateid_slab, stp);
1112 move_to_close_lru(struct nfs4_stateowner *sop)
1114 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1116 list_move_tail(&sop->so_close_lru, &close_lru);
1117 sop->so_time = get_seconds();
1121 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1124 return (sop->so_owner.len == owner->len) &&
1125 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1126 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1129 static struct nfs4_stateowner *
1130 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1132 struct nfs4_stateowner *so = NULL;
1134 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1135 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1141 /* search file_hashtbl[] for file */
1142 static struct nfs4_file *
1143 find_file(struct inode *ino)
1145 unsigned int hashval = file_hashval(ino);
1146 struct nfs4_file *fp;
1148 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1149 if (fp->fi_inode == ino) {
1157 static int access_valid(u32 x)
1159 return (x > 0 && x < 4);
1162 static int deny_valid(u32 x)
1164 return (x >= 0 && x < 5);
1168 set_access(unsigned int *access, unsigned long bmap) {
1172 for (i = 1; i < 4; i++) {
1173 if (test_bit(i, &bmap))
1179 set_deny(unsigned int *deny, unsigned long bmap) {
1183 for (i = 0; i < 4; i++) {
1184 if (test_bit(i, &bmap))
1190 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1191 unsigned int access, deny;
1193 set_access(&access, stp->st_access_bmap);
1194 set_deny(&deny, stp->st_deny_bmap);
1195 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1201 * Called to check deny when READ with all zero stateid or
1202 * WRITE with all zero or all one stateid
1205 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1207 struct inode *ino = current_fh->fh_dentry->d_inode;
1208 struct nfs4_file *fp;
1209 struct nfs4_stateid *stp;
1212 dprintk("NFSD: nfs4_share_conflict\n");
1214 fp = find_file(ino);
1217 ret = nfserr_locked;
1218 /* Search for conflicting share reservations */
1219 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1220 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1221 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1231 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1233 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1234 put_write_access(filp->f_path.dentry->d_inode);
1235 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1240 * Recall a delegation
1243 do_recall(void *__dp)
1245 struct nfs4_delegation *dp = __dp;
1247 dp->dl_file->fi_had_conflict = true;
1248 nfsd4_cb_recall(dp);
1253 * Spawn a thread to perform a recall on the delegation represented
1254 * by the lease (file_lock)
1256 * Called from break_lease() with lock_kernel() held.
1257 * Note: we assume break_lease will only call this *once* for any given
1261 void nfsd_break_deleg_cb(struct file_lock *fl)
1263 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1264 struct task_struct *t;
1266 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1270 /* We're assuming the state code never drops its reference
1271 * without first removing the lease. Since we're in this lease
1272 * callback (and since the lease code is serialized by the kernel
1273 * lock) we know the server hasn't removed the lease yet, we know
1274 * it's safe to take a reference: */
1275 atomic_inc(&dp->dl_count);
1276 atomic_inc(&dp->dl_client->cl_count);
1278 spin_lock(&recall_lock);
1279 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1280 spin_unlock(&recall_lock);
1282 /* only place dl_time is set. protected by lock_kernel*/
1283 dp->dl_time = get_seconds();
1286 * We don't want the locks code to timeout the lease for us;
1287 * we'll remove it ourself if the delegation isn't returned
1290 fl->fl_break_time = 0;
1292 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1294 struct nfs4_client *clp = dp->dl_client;
1296 printk(KERN_INFO "NFSD: Callback thread failed for "
1297 "for client (clientid %08x/%08x)\n",
1298 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1299 put_nfs4_client(dp->dl_client);
1300 nfs4_put_delegation(dp);
1305 * The file_lock is being reapd.
1307 * Called by locks_free_lock() with lock_kernel() held.
1310 void nfsd_release_deleg_cb(struct file_lock *fl)
1312 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1314 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1316 if (!(fl->fl_flags & FL_LEASE) || !dp)
1318 dp->dl_flock = NULL;
1322 * Set the delegation file_lock back pointer.
1324 * Called from setlease() with lock_kernel() held.
1327 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1329 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1331 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1338 * Called from setlease() with lock_kernel() held
1341 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1343 struct nfs4_delegation *onlistd =
1344 (struct nfs4_delegation *)onlist->fl_owner;
1345 struct nfs4_delegation *tryd =
1346 (struct nfs4_delegation *)try->fl_owner;
1348 if (onlist->fl_lmops != try->fl_lmops)
1351 return onlistd->dl_client == tryd->dl_client;
1356 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1359 return lease_modify(onlist, arg);
1364 static struct lock_manager_operations nfsd_lease_mng_ops = {
1365 .fl_break = nfsd_break_deleg_cb,
1366 .fl_release_private = nfsd_release_deleg_cb,
1367 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1368 .fl_mylease = nfsd_same_client_deleg_cb,
1369 .fl_change = nfsd_change_deleg_cb,
1374 nfsd4_process_open1(struct nfsd4_open *open)
1376 clientid_t *clientid = &open->op_clientid;
1377 struct nfs4_client *clp = NULL;
1378 unsigned int strhashval;
1379 struct nfs4_stateowner *sop = NULL;
1381 if (!check_name(open->op_owner))
1382 return nfserr_inval;
1384 if (STALE_CLIENTID(&open->op_clientid))
1385 return nfserr_stale_clientid;
1387 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1388 sop = find_openstateowner_str(strhashval, open);
1389 open->op_stateowner = sop;
1391 /* Make sure the client's lease hasn't expired. */
1392 clp = find_confirmed_client(clientid);
1394 return nfserr_expired;
1397 if (!sop->so_confirmed) {
1398 /* Replace unconfirmed owners without checking for replay. */
1399 clp = sop->so_client;
1400 release_stateowner(sop);
1401 open->op_stateowner = NULL;
1404 if (open->op_seqid == sop->so_seqid - 1) {
1405 if (sop->so_replay.rp_buflen)
1406 return nfserr_replay_me;
1407 /* The original OPEN failed so spectacularly
1408 * that we don't even have replay data saved!
1409 * Therefore, we have no choice but to continue
1410 * processing this OPEN; presumably, we'll
1411 * fail again for the same reason.
1413 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1416 if (open->op_seqid != sop->so_seqid)
1417 return nfserr_bad_seqid;
1419 if (open->op_stateowner == NULL) {
1420 sop = alloc_init_open_stateowner(strhashval, clp, open);
1422 return nfserr_resource;
1423 open->op_stateowner = sop;
1425 list_del_init(&sop->so_close_lru);
1426 renew_client(sop->so_client);
1430 static inline __be32
1431 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1433 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1434 return nfserr_openmode;
1439 static struct nfs4_delegation *
1440 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1442 struct nfs4_delegation *dp;
1444 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1445 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1452 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1453 struct nfs4_delegation **dp)
1456 __be32 status = nfserr_bad_stateid;
1458 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1461 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1462 RD_STATE : WR_STATE;
1463 status = nfs4_check_delegmode(*dp, flags);
1467 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1471 open->op_stateowner->so_confirmed = 1;
1476 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1478 struct nfs4_stateid *local;
1479 __be32 status = nfserr_share_denied;
1480 struct nfs4_stateowner *sop = open->op_stateowner;
1482 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1483 /* ignore lock owners */
1484 if (local->st_stateowner->so_is_open_owner == 0)
1486 /* remember if we have seen this open owner */
1487 if (local->st_stateowner == sop)
1489 /* check for conflicting share reservations */
1490 if (!test_share(local, open))
1498 static inline struct nfs4_stateid *
1499 nfs4_alloc_stateid(void)
1501 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1505 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1506 struct nfs4_delegation *dp,
1507 struct svc_fh *cur_fh, int flags)
1509 struct nfs4_stateid *stp;
1511 stp = nfs4_alloc_stateid();
1513 return nfserr_resource;
1516 get_file(dp->dl_vfs_file);
1517 stp->st_vfs_file = dp->dl_vfs_file;
1520 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1523 if (status == nfserr_dropit)
1524 status = nfserr_jukebox;
1525 kmem_cache_free(stateid_slab, stp);
1533 static inline __be32
1534 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1535 struct nfsd4_open *open)
1537 struct iattr iattr = {
1538 .ia_valid = ATTR_SIZE,
1541 if (!open->op_truncate)
1543 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1544 return nfserr_inval;
1545 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1549 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1551 struct file *filp = stp->st_vfs_file;
1552 struct inode *inode = filp->f_path.dentry->d_inode;
1553 unsigned int share_access, new_writer;
1556 set_access(&share_access, stp->st_access_bmap);
1557 new_writer = (~share_access) & open->op_share_access
1558 & NFS4_SHARE_ACCESS_WRITE;
1561 int err = get_write_access(inode);
1563 return nfserrno(err);
1565 status = nfsd4_truncate(rqstp, cur_fh, open);
1568 put_write_access(inode);
1571 /* remember the open */
1572 filp->f_mode |= open->op_share_access;
1573 set_bit(open->op_share_access, &stp->st_access_bmap);
1574 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1581 nfs4_set_claim_prev(struct nfsd4_open *open)
1583 open->op_stateowner->so_confirmed = 1;
1584 open->op_stateowner->so_client->cl_firststate = 1;
1588 * Attempt to hand out a delegation.
1591 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1593 struct nfs4_delegation *dp;
1594 struct nfs4_stateowner *sop = stp->st_stateowner;
1595 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1596 struct file_lock fl, *flp = &fl;
1597 int status, flag = 0;
1599 flag = NFS4_OPEN_DELEGATE_NONE;
1600 open->op_recall = 0;
1601 switch (open->op_claim_type) {
1602 case NFS4_OPEN_CLAIM_PREVIOUS:
1603 if (!atomic_read(&cb->cb_set))
1604 open->op_recall = 1;
1605 flag = open->op_delegate_type;
1606 if (flag == NFS4_OPEN_DELEGATE_NONE)
1609 case NFS4_OPEN_CLAIM_NULL:
1610 /* Let's not give out any delegations till everyone's
1611 * had the chance to reclaim theirs.... */
1612 if (nfs4_in_grace())
1614 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1616 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1617 flag = NFS4_OPEN_DELEGATE_WRITE;
1619 flag = NFS4_OPEN_DELEGATE_READ;
1625 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1627 flag = NFS4_OPEN_DELEGATE_NONE;
1630 locks_init_lock(&fl);
1631 fl.fl_lmops = &nfsd_lease_mng_ops;
1632 fl.fl_flags = FL_LEASE;
1633 fl.fl_end = OFFSET_MAX;
1634 fl.fl_owner = (fl_owner_t)dp;
1635 fl.fl_file = stp->st_vfs_file;
1636 fl.fl_pid = current->tgid;
1638 /* vfs_setlease checks to see if delegation should be handed out.
1639 * the lock_manager callbacks fl_mylease and fl_change are used
1641 if ((status = vfs_setlease(stp->st_vfs_file,
1642 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1643 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1644 unhash_delegation(dp);
1645 flag = NFS4_OPEN_DELEGATE_NONE;
1649 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1651 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1652 dp->dl_stateid.si_boot,
1653 dp->dl_stateid.si_stateownerid,
1654 dp->dl_stateid.si_fileid,
1655 dp->dl_stateid.si_generation);
1657 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1658 && flag == NFS4_OPEN_DELEGATE_NONE
1659 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1660 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1661 open->op_delegate_type = flag;
1665 * called with nfs4_lock_state() held.
1668 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1670 struct nfs4_file *fp = NULL;
1671 struct inode *ino = current_fh->fh_dentry->d_inode;
1672 struct nfs4_stateid *stp = NULL;
1673 struct nfs4_delegation *dp = NULL;
1676 status = nfserr_inval;
1677 if (!access_valid(open->op_share_access)
1678 || !deny_valid(open->op_share_deny))
1681 * Lookup file; if found, lookup stateid and check open request,
1682 * and check for delegations in the process of being recalled.
1683 * If not found, create the nfs4_file struct
1685 fp = find_file(ino);
1687 if ((status = nfs4_check_open(fp, open, &stp)))
1689 status = nfs4_check_deleg(fp, open, &dp);
1693 status = nfserr_bad_stateid;
1694 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1696 status = nfserr_resource;
1697 fp = alloc_init_file(ino);
1703 * OPEN the file, or upgrade an existing OPEN.
1704 * If truncate fails, the OPEN fails.
1707 /* Stateid was found, this is an OPEN upgrade */
1708 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1711 update_stateid(&stp->st_stateid);
1713 /* Stateid was not found, this is a new OPEN */
1715 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1717 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1719 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1722 init_stateid(stp, fp, open);
1723 status = nfsd4_truncate(rqstp, current_fh, open);
1725 release_stateid(stp, OPEN_STATE);
1729 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1732 * Attempt to hand out a delegation. No error return, because the
1733 * OPEN succeeds even if we fail.
1735 nfs4_open_delegation(current_fh, open, stp);
1739 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1740 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1741 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1745 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1746 nfs4_set_claim_prev(open);
1748 * To finish the open response, we just need to set the rflags.
1750 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1751 if (!open->op_stateowner->so_confirmed)
1752 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1757 static struct workqueue_struct *laundry_wq;
1758 static void laundromat_main(struct work_struct *);
1759 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1762 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1765 struct nfs4_client *clp;
1769 dprintk("process_renew(%08x/%08x): starting\n",
1770 clid->cl_boot, clid->cl_id);
1771 status = nfserr_stale_clientid;
1772 if (STALE_CLIENTID(clid))
1774 clp = find_confirmed_client(clid);
1775 status = nfserr_expired;
1777 /* We assume the client took too long to RENEW. */
1778 dprintk("nfsd4_renew: clientid not found!\n");
1782 status = nfserr_cb_path_down;
1783 if (!list_empty(&clp->cl_delegations)
1784 && !atomic_read(&clp->cl_callback.cb_set))
1788 nfs4_unlock_state();
1795 dprintk("NFSD: end of grace period\n");
1796 nfsd4_recdir_purge_old();
1801 nfs4_laundromat(void)
1803 struct nfs4_client *clp;
1804 struct nfs4_stateowner *sop;
1805 struct nfs4_delegation *dp;
1806 struct list_head *pos, *next, reaplist;
1807 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1808 time_t t, clientid_val = NFSD_LEASE_TIME;
1809 time_t u, test_val = NFSD_LEASE_TIME;
1813 dprintk("NFSD: laundromat service - starting\n");
1816 list_for_each_safe(pos, next, &client_lru) {
1817 clp = list_entry(pos, struct nfs4_client, cl_lru);
1818 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1819 t = clp->cl_time - cutoff;
1820 if (clientid_val > t)
1824 dprintk("NFSD: purging unused client (clientid %08x)\n",
1825 clp->cl_clientid.cl_id);
1826 nfsd4_remove_clid_dir(clp);
1829 INIT_LIST_HEAD(&reaplist);
1830 spin_lock(&recall_lock);
1831 list_for_each_safe(pos, next, &del_recall_lru) {
1832 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1833 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1834 u = dp->dl_time - cutoff;
1839 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1841 list_move(&dp->dl_recall_lru, &reaplist);
1843 spin_unlock(&recall_lock);
1844 list_for_each_safe(pos, next, &reaplist) {
1845 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1846 list_del_init(&dp->dl_recall_lru);
1847 unhash_delegation(dp);
1849 test_val = NFSD_LEASE_TIME;
1850 list_for_each_safe(pos, next, &close_lru) {
1851 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1852 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1853 u = sop->so_time - cutoff;
1858 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1860 release_stateowner(sop);
1862 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1863 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1864 nfs4_unlock_state();
1865 return clientid_val;
1869 laundromat_main(struct work_struct *not_used)
1873 t = nfs4_laundromat();
1874 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1875 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1878 static struct nfs4_stateowner *
1879 search_close_lru(u32 st_id, int flags)
1881 struct nfs4_stateowner *local = NULL;
1883 if (flags & CLOSE_STATE) {
1884 list_for_each_entry(local, &close_lru, so_close_lru) {
1885 if (local->so_id == st_id)
1893 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1895 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1899 STALE_STATEID(stateid_t *stateid)
1901 if (stateid->si_boot == boot_time)
1903 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1904 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1905 stateid->si_generation);
1910 access_permit_read(unsigned long access_bmap)
1912 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1913 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1914 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1918 access_permit_write(unsigned long access_bmap)
1920 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1921 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1925 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1927 __be32 status = nfserr_openmode;
1929 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1931 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1938 static inline __be32
1939 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1941 /* Trying to call delegreturn with a special stateid? Yuch: */
1942 if (!(flags & (RD_STATE | WR_STATE)))
1943 return nfserr_bad_stateid;
1944 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1946 else if (nfs4_in_grace()) {
1947 /* Answer in remaining cases depends on existance of
1948 * conflicting state; so we must wait out the grace period. */
1949 return nfserr_grace;
1950 } else if (flags & WR_STATE)
1951 return nfs4_share_conflict(current_fh,
1952 NFS4_SHARE_DENY_WRITE);
1953 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1954 return nfs4_share_conflict(current_fh,
1955 NFS4_SHARE_DENY_READ);
1959 * Allow READ/WRITE during grace period on recovered state only for files
1960 * that are not able to provide mandatory locking.
1963 io_during_grace_disallowed(struct inode *inode, int flags)
1965 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1966 && mandatory_lock(inode);
1970 * Checks for stateid operations
1973 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1975 struct nfs4_stateid *stp = NULL;
1976 struct nfs4_delegation *dp = NULL;
1978 struct inode *ino = current_fh->fh_dentry->d_inode;
1981 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1982 stateid->si_boot, stateid->si_stateownerid,
1983 stateid->si_fileid, stateid->si_generation);
1987 if (io_during_grace_disallowed(ino, flags))
1988 return nfserr_grace;
1990 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1991 return check_special_stateids(current_fh, stateid, flags);
1994 status = nfserr_stale_stateid;
1995 if (STALE_STATEID(stateid))
1999 status = nfserr_bad_stateid;
2000 if (!stateid->si_fileid) { /* delegation stateid */
2001 if(!(dp = find_delegation_stateid(ino, stateid))) {
2002 dprintk("NFSD: delegation stateid not found\n");
2005 stidp = &dp->dl_stateid;
2006 } else { /* open or lock stateid */
2007 if (!(stp = find_stateid(stateid, flags))) {
2008 dprintk("NFSD: open or lock stateid not found\n");
2011 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2013 if (!stp->st_stateowner->so_confirmed)
2015 stidp = &stp->st_stateid;
2017 if (stateid->si_generation > stidp->si_generation)
2021 status = nfserr_old_stateid;
2022 if (stateid->si_generation < stidp->si_generation)
2025 if ((status = nfs4_check_openmode(stp,flags)))
2027 renew_client(stp->st_stateowner->so_client);
2029 *filpp = stp->st_vfs_file;
2031 if ((status = nfs4_check_delegmode(dp, flags)))
2033 renew_client(dp->dl_client);
2034 if (flags & DELEG_RET)
2035 unhash_delegation(dp);
2037 *filpp = dp->dl_vfs_file;
2047 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2048 RD_STATE : WR_STATE;
2052 * Checks for sequence id mutating operations.
2055 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)
2057 struct nfs4_stateid *stp;
2058 struct nfs4_stateowner *sop;
2060 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2061 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2062 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2063 stateid->si_generation);
2068 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2069 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2070 return nfserr_bad_stateid;
2073 if (STALE_STATEID(stateid))
2074 return nfserr_stale_stateid;
2076 * We return BAD_STATEID if filehandle doesn't match stateid,
2077 * the confirmed flag is incorrecly set, or the generation
2078 * number is incorrect.
2080 stp = find_stateid(stateid, flags);
2083 * Also, we should make sure this isn't just the result of
2086 sop = search_close_lru(stateid->si_stateownerid, flags);
2088 return nfserr_bad_stateid;
2094 struct nfs4_stateowner *sop = stp->st_stateowner;
2095 clientid_t *lockclid = &lock->v.new.clientid;
2096 struct nfs4_client *clp = sop->so_client;
2100 lkflg = setlkflg(lock->lk_type);
2102 if (lock->lk_is_new) {
2103 if (!sop->so_is_open_owner)
2104 return nfserr_bad_stateid;
2105 if (!same_clid(&clp->cl_clientid, lockclid))
2106 return nfserr_bad_stateid;
2107 /* stp is the open stateid */
2108 status = nfs4_check_openmode(stp, lkflg);
2112 /* stp is the lock stateid */
2113 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2119 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2120 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2121 return nfserr_bad_stateid;
2125 *sopp = sop = stp->st_stateowner;
2128 * We now validate the seqid and stateid generation numbers.
2129 * For the moment, we ignore the possibility of
2130 * generation number wraparound.
2132 if (seqid != sop->so_seqid)
2135 if (sop->so_confirmed && flags & CONFIRM) {
2136 dprintk("NFSD: preprocess_seqid_op: expected"
2137 " unconfirmed stateowner!\n");
2138 return nfserr_bad_stateid;
2140 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2141 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2142 " confirmed yet!\n");
2143 return nfserr_bad_stateid;
2145 if (stateid->si_generation > stp->st_stateid.si_generation) {
2146 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
2147 return nfserr_bad_stateid;
2150 if (stateid->si_generation < stp->st_stateid.si_generation) {
2151 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
2152 return nfserr_old_stateid;
2154 renew_client(sop->so_client);
2158 if (seqid == sop->so_seqid - 1) {
2159 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2160 /* indicate replay to calling function */
2161 return nfserr_replay_me;
2163 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2164 sop->so_seqid, seqid);
2166 return nfserr_bad_seqid;
2170 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2171 struct nfsd4_open_confirm *oc)
2174 struct nfs4_stateowner *sop;
2175 struct nfs4_stateid *stp;
2177 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2178 (int)cstate->current_fh.fh_dentry->d_name.len,
2179 cstate->current_fh.fh_dentry->d_name.name);
2181 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2187 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2188 oc->oc_seqid, &oc->oc_req_stateid,
2189 CHECK_FH | CONFIRM | OPEN_STATE,
2190 &oc->oc_stateowner, &stp, NULL)))
2193 sop = oc->oc_stateowner;
2194 sop->so_confirmed = 1;
2195 update_stateid(&stp->st_stateid);
2196 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2197 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2198 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2199 stp->st_stateid.si_boot,
2200 stp->st_stateid.si_stateownerid,
2201 stp->st_stateid.si_fileid,
2202 stp->st_stateid.si_generation);
2204 nfsd4_create_clid_dir(sop->so_client);
2206 if (oc->oc_stateowner) {
2207 nfs4_get_stateowner(oc->oc_stateowner);
2208 cstate->replay_owner = oc->oc_stateowner;
2210 nfs4_unlock_state();
2216 * unset all bits in union bitmap (bmap) that
2217 * do not exist in share (from successful OPEN_DOWNGRADE)
2220 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2223 for (i = 1; i < 4; i++) {
2224 if ((i & access) != i)
2225 __clear_bit(i, bmap);
2230 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2233 for (i = 0; i < 4; i++) {
2234 if ((i & deny) != i)
2235 __clear_bit(i, bmap);
2240 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2241 struct nfsd4_compound_state *cstate,
2242 struct nfsd4_open_downgrade *od)
2245 struct nfs4_stateid *stp;
2246 unsigned int share_access;
2248 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2249 (int)cstate->current_fh.fh_dentry->d_name.len,
2250 cstate->current_fh.fh_dentry->d_name.name);
2252 if (!access_valid(od->od_share_access)
2253 || !deny_valid(od->od_share_deny))
2254 return nfserr_inval;
2257 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2260 CHECK_FH | OPEN_STATE,
2261 &od->od_stateowner, &stp, NULL)))
2264 status = nfserr_inval;
2265 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2266 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2267 stp->st_access_bmap, od->od_share_access);
2270 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2271 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2272 stp->st_deny_bmap, od->od_share_deny);
2275 set_access(&share_access, stp->st_access_bmap);
2276 nfs4_file_downgrade(stp->st_vfs_file,
2277 share_access & ~od->od_share_access);
2279 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2280 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2282 update_stateid(&stp->st_stateid);
2283 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2286 if (od->od_stateowner) {
2287 nfs4_get_stateowner(od->od_stateowner);
2288 cstate->replay_owner = od->od_stateowner;
2290 nfs4_unlock_state();
2295 * nfs4_unlock_state() called after encode
2298 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2299 struct nfsd4_close *close)
2302 struct nfs4_stateid *stp;
2304 dprintk("NFSD: nfsd4_close on file %.*s\n",
2305 (int)cstate->current_fh.fh_dentry->d_name.len,
2306 cstate->current_fh.fh_dentry->d_name.name);
2309 /* check close_lru for replay */
2310 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2313 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2314 &close->cl_stateowner, &stp, NULL)))
2317 update_stateid(&stp->st_stateid);
2318 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2320 /* release_stateid() calls nfsd_close() if needed */
2321 release_stateid(stp, OPEN_STATE);
2323 /* place unused nfs4_stateowners on so_close_lru list to be
2324 * released by the laundromat service after the lease period
2325 * to enable us to handle CLOSE replay
2327 if (list_empty(&close->cl_stateowner->so_stateids))
2328 move_to_close_lru(close->cl_stateowner);
2330 if (close->cl_stateowner) {
2331 nfs4_get_stateowner(close->cl_stateowner);
2332 cstate->replay_owner = close->cl_stateowner;
2334 nfs4_unlock_state();
2339 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2340 struct nfsd4_delegreturn *dr)
2344 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2348 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2349 &dr->dr_stateid, DELEG_RET, NULL);
2350 nfs4_unlock_state();
2357 * Lock owner state (byte-range locks)
2359 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2360 #define LOCK_HASH_BITS 8
2361 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2362 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2364 #define lockownerid_hashval(id) \
2365 ((id) & LOCK_HASH_MASK)
2367 static inline unsigned int
2368 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2369 struct xdr_netobj *ownername)
2371 return (file_hashval(inode) + cl_id
2372 + opaque_hashval(ownername->data, ownername->len))
2376 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2377 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2378 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2380 static struct nfs4_stateid *
2381 find_stateid(stateid_t *stid, int flags)
2383 struct nfs4_stateid *local = NULL;
2384 u32 st_id = stid->si_stateownerid;
2385 u32 f_id = stid->si_fileid;
2386 unsigned int hashval;
2388 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2389 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2390 hashval = stateid_hashval(st_id, f_id);
2391 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2392 if ((local->st_stateid.si_stateownerid == st_id) &&
2393 (local->st_stateid.si_fileid == f_id))
2397 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2398 hashval = stateid_hashval(st_id, f_id);
2399 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2400 if ((local->st_stateid.si_stateownerid == st_id) &&
2401 (local->st_stateid.si_fileid == f_id))
2408 static struct nfs4_delegation *
2409 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2411 struct nfs4_file *fp;
2412 struct nfs4_delegation *dl;
2414 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2415 stid->si_boot, stid->si_stateownerid,
2416 stid->si_fileid, stid->si_generation);
2418 fp = find_file(ino);
2421 dl = find_delegation_file(fp, stid);
2427 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2428 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2429 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2430 * locking, this prevents us from being completely protocol-compliant. The
2431 * real solution to this problem is to start using unsigned file offsets in
2432 * the VFS, but this is a very deep change!
2435 nfs4_transform_lock_offset(struct file_lock *lock)
2437 if (lock->fl_start < 0)
2438 lock->fl_start = OFFSET_MAX;
2439 if (lock->fl_end < 0)
2440 lock->fl_end = OFFSET_MAX;
2443 /* Hack!: For now, we're defining this just so we can use a pointer to it
2444 * as a unique cookie to identify our (NFSv4's) posix locks. */
2445 static struct lock_manager_operations nfsd_posix_mng_ops = {
2449 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2451 struct nfs4_stateowner *sop;
2454 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2455 sop = (struct nfs4_stateowner *) fl->fl_owner;
2456 hval = lockownerid_hashval(sop->so_id);
2457 kref_get(&sop->so_ref);
2459 deny->ld_clientid = sop->so_client->cl_clientid;
2461 deny->ld_sop = NULL;
2462 deny->ld_clientid.cl_boot = 0;
2463 deny->ld_clientid.cl_id = 0;
2465 deny->ld_start = fl->fl_start;
2466 deny->ld_length = ~(u64)0;
2467 if (fl->fl_end != ~(u64)0)
2468 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2469 deny->ld_type = NFS4_READ_LT;
2470 if (fl->fl_type != F_RDLCK)
2471 deny->ld_type = NFS4_WRITE_LT;
2474 static struct nfs4_stateowner *
2475 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2476 struct xdr_netobj *owner)
2478 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2479 struct nfs4_stateowner *op;
2481 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2482 if (same_owner_str(op, owner, clid))
2489 * Alloc a lock owner structure.
2490 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2493 * strhashval = lock_ownerstr_hashval
2496 static struct nfs4_stateowner *
2497 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2498 struct nfs4_stateowner *sop;
2499 struct nfs4_replay *rp;
2500 unsigned int idhashval;
2502 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2504 idhashval = lockownerid_hashval(current_ownerid);
2505 INIT_LIST_HEAD(&sop->so_idhash);
2506 INIT_LIST_HEAD(&sop->so_strhash);
2507 INIT_LIST_HEAD(&sop->so_perclient);
2508 INIT_LIST_HEAD(&sop->so_stateids);
2509 INIT_LIST_HEAD(&sop->so_perstateid);
2510 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2512 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2513 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2514 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2515 sop->so_is_open_owner = 0;
2516 sop->so_id = current_ownerid++;
2517 sop->so_client = clp;
2518 /* It is the openowner seqid that will be incremented in encode in the
2519 * case of new lockowners; so increment the lock seqid manually: */
2520 sop->so_seqid = lock->lk_new_lock_seqid + 1;
2521 sop->so_confirmed = 1;
2522 rp = &sop->so_replay;
2523 rp->rp_status = nfserr_serverfault;
2525 rp->rp_buf = rp->rp_ibuf;
2529 static struct nfs4_stateid *
2530 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2532 struct nfs4_stateid *stp;
2533 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2535 stp = nfs4_alloc_stateid();
2538 INIT_LIST_HEAD(&stp->st_hash);
2539 INIT_LIST_HEAD(&stp->st_perfile);
2540 INIT_LIST_HEAD(&stp->st_perstateowner);
2541 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2542 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2543 list_add(&stp->st_perfile, &fp->fi_stateids);
2544 list_add(&stp->st_perstateowner, &sop->so_stateids);
2545 stp->st_stateowner = sop;
2548 stp->st_stateid.si_boot = boot_time;
2549 stp->st_stateid.si_stateownerid = sop->so_id;
2550 stp->st_stateid.si_fileid = fp->fi_id;
2551 stp->st_stateid.si_generation = 0;
2552 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2553 stp->st_access_bmap = open_stp->st_access_bmap;
2554 stp->st_deny_bmap = open_stp->st_deny_bmap;
2555 stp->st_openstp = open_stp;
2562 check_lock_length(u64 offset, u64 length)
2564 return ((length == 0) || ((length != ~(u64)0) &&
2565 LOFF_OVERFLOW(offset, length)));
2572 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2573 struct nfsd4_lock *lock)
2575 struct nfs4_stateowner *open_sop = NULL;
2576 struct nfs4_stateowner *lock_sop = NULL;
2577 struct nfs4_stateid *lock_stp;
2579 struct file_lock file_lock;
2580 struct file_lock conflock;
2582 unsigned int strhashval;
2586 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2587 (long long) lock->lk_offset,
2588 (long long) lock->lk_length);
2590 if (check_lock_length(lock->lk_offset, lock->lk_length))
2591 return nfserr_inval;
2593 if ((status = fh_verify(rqstp, &cstate->current_fh,
2594 S_IFREG, MAY_LOCK))) {
2595 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2601 if (lock->lk_is_new) {
2603 * Client indicates that this is a new lockowner.
2604 * Use open owner and open stateid to create lock owner and
2607 struct nfs4_stateid *open_stp = NULL;
2608 struct nfs4_file *fp;
2610 status = nfserr_stale_clientid;
2611 if (STALE_CLIENTID(&lock->lk_new_clientid))
2614 /* validate and update open stateid and open seqid */
2615 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2616 lock->lk_new_open_seqid,
2617 &lock->lk_new_open_stateid,
2618 CHECK_FH | OPEN_STATE,
2619 &lock->lk_replay_owner, &open_stp,
2623 open_sop = lock->lk_replay_owner;
2624 /* create lockowner and lock stateid */
2625 fp = open_stp->st_file;
2626 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2627 open_sop->so_client->cl_clientid.cl_id,
2628 &lock->v.new.owner);
2629 /* XXX: Do we need to check for duplicate stateowners on
2630 * the same file, or should they just be allowed (and
2631 * create new stateids)? */
2632 status = nfserr_resource;
2633 lock_sop = alloc_init_lock_stateowner(strhashval,
2634 open_sop->so_client, open_stp, lock);
2635 if (lock_sop == NULL)
2637 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2638 if (lock_stp == NULL)
2641 /* lock (lock owner + lock stateid) already exists */
2642 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2643 lock->lk_old_lock_seqid,
2644 &lock->lk_old_lock_stateid,
2645 CHECK_FH | LOCK_STATE,
2646 &lock->lk_replay_owner, &lock_stp, lock);
2649 lock_sop = lock->lk_replay_owner;
2651 /* lock->lk_replay_owner and lock_stp have been created or found */
2652 filp = lock_stp->st_vfs_file;
2654 status = nfserr_grace;
2655 if (nfs4_in_grace() && !lock->lk_reclaim)
2657 status = nfserr_no_grace;
2658 if (!nfs4_in_grace() && lock->lk_reclaim)
2661 locks_init_lock(&file_lock);
2662 switch (lock->lk_type) {
2665 file_lock.fl_type = F_RDLCK;
2669 case NFS4_WRITEW_LT:
2670 file_lock.fl_type = F_WRLCK;
2674 status = nfserr_inval;
2677 file_lock.fl_owner = (fl_owner_t)lock_sop;
2678 file_lock.fl_pid = current->tgid;
2679 file_lock.fl_file = filp;
2680 file_lock.fl_flags = FL_POSIX;
2681 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2683 file_lock.fl_start = lock->lk_offset;
2684 if ((lock->lk_length == ~(u64)0) ||
2685 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2686 file_lock.fl_end = ~(u64)0;
2688 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2689 nfs4_transform_lock_offset(&file_lock);
2692 * Try to lock the file in the VFS.
2693 * Note: locks.c uses the BKL to protect the inode's lock list.
2696 /* XXX?: Just to divert the locks_release_private at the start of
2697 * locks_copy_lock: */
2698 locks_init_lock(&conflock);
2699 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2701 case 0: /* success! */
2702 update_stateid(&lock_stp->st_stateid);
2703 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2707 case (EAGAIN): /* conflock holds conflicting lock */
2708 status = nfserr_denied;
2709 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2710 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2713 status = nfserr_deadlock;
2716 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2717 status = nfserr_resource;
2721 if (status && lock->lk_is_new && lock_sop)
2722 release_stateowner(lock_sop);
2723 if (lock->lk_replay_owner) {
2724 nfs4_get_stateowner(lock->lk_replay_owner);
2725 cstate->replay_owner = lock->lk_replay_owner;
2727 nfs4_unlock_state();
2735 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2736 struct nfsd4_lockt *lockt)
2738 struct inode *inode;
2740 struct file_lock file_lock;
2744 if (nfs4_in_grace())
2745 return nfserr_grace;
2747 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2748 return nfserr_inval;
2750 lockt->lt_stateowner = NULL;
2753 status = nfserr_stale_clientid;
2754 if (STALE_CLIENTID(&lockt->lt_clientid))
2757 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2758 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2759 if (status == nfserr_symlink)
2760 status = nfserr_inval;
2764 inode = cstate->current_fh.fh_dentry->d_inode;
2765 locks_init_lock(&file_lock);
2766 switch (lockt->lt_type) {
2769 file_lock.fl_type = F_RDLCK;
2772 case NFS4_WRITEW_LT:
2773 file_lock.fl_type = F_WRLCK;
2776 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2777 status = nfserr_inval;
2781 lockt->lt_stateowner = find_lockstateowner_str(inode,
2782 &lockt->lt_clientid, &lockt->lt_owner);
2783 if (lockt->lt_stateowner)
2784 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2785 file_lock.fl_pid = current->tgid;
2786 file_lock.fl_flags = FL_POSIX;
2787 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2789 file_lock.fl_start = lockt->lt_offset;
2790 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2791 file_lock.fl_end = ~(u64)0;
2793 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2795 nfs4_transform_lock_offset(&file_lock);
2797 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2798 * since LOCKT doesn't require an OPEN, and therefore a struct
2799 * file may not exist, pass vfs_test_lock a struct file with
2800 * only the dentry:inode set.
2802 memset(&file, 0, sizeof (struct file));
2803 file.f_path.dentry = cstate->current_fh.fh_dentry;
2806 error = vfs_test_lock(&file, &file_lock);
2808 status = nfserrno(error);
2811 if (file_lock.fl_type != F_UNLCK) {
2812 status = nfserr_denied;
2813 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2816 nfs4_unlock_state();
2821 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2822 struct nfsd4_locku *locku)
2824 struct nfs4_stateid *stp;
2825 struct file *filp = NULL;
2826 struct file_lock file_lock;
2830 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2831 (long long) locku->lu_offset,
2832 (long long) locku->lu_length);
2834 if (check_lock_length(locku->lu_offset, locku->lu_length))
2835 return nfserr_inval;
2839 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2842 CHECK_FH | LOCK_STATE,
2843 &locku->lu_stateowner, &stp, NULL)))
2846 filp = stp->st_vfs_file;
2848 locks_init_lock(&file_lock);
2849 file_lock.fl_type = F_UNLCK;
2850 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2851 file_lock.fl_pid = current->tgid;
2852 file_lock.fl_file = filp;
2853 file_lock.fl_flags = FL_POSIX;
2854 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2855 file_lock.fl_start = locku->lu_offset;
2857 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2858 file_lock.fl_end = ~(u64)0;
2860 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2861 nfs4_transform_lock_offset(&file_lock);
2864 * Try to unlock the file in the VFS.
2866 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2868 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2872 * OK, unlock succeeded; the only thing left to do is update the stateid.
2874 update_stateid(&stp->st_stateid);
2875 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2878 if (locku->lu_stateowner) {
2879 nfs4_get_stateowner(locku->lu_stateowner);
2880 cstate->replay_owner = locku->lu_stateowner;
2882 nfs4_unlock_state();
2886 status = nfserrno(err);
2892 * 1: locks held by lockowner
2893 * 0: no locks held by lockowner
2896 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2898 struct file_lock **flpp;
2899 struct inode *inode = filp->f_path.dentry->d_inode;
2903 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2904 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2915 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2916 struct nfsd4_compound_state *cstate,
2917 struct nfsd4_release_lockowner *rlockowner)
2919 clientid_t *clid = &rlockowner->rl_clientid;
2920 struct nfs4_stateowner *sop;
2921 struct nfs4_stateid *stp;
2922 struct xdr_netobj *owner = &rlockowner->rl_owner;
2923 struct list_head matches;
2927 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2928 clid->cl_boot, clid->cl_id);
2930 /* XXX check for lease expiration */
2932 status = nfserr_stale_clientid;
2933 if (STALE_CLIENTID(clid))
2938 status = nfserr_locks_held;
2939 /* XXX: we're doing a linear search through all the lockowners.
2940 * Yipes! For now we'll just hope clients aren't really using
2941 * release_lockowner much, but eventually we have to fix these
2942 * data structures. */
2943 INIT_LIST_HEAD(&matches);
2944 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2945 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2946 if (!same_owner_str(sop, owner, clid))
2948 list_for_each_entry(stp, &sop->so_stateids,
2950 if (check_for_locks(stp->st_vfs_file, sop))
2952 /* Note: so_perclient unused for lockowners,
2953 * so it's OK to fool with here. */
2954 list_add(&sop->so_perclient, &matches);
2958 /* Clients probably won't expect us to return with some (but not all)
2959 * of the lockowner state released; so don't release any until all
2960 * have been checked. */
2962 while (!list_empty(&matches)) {
2963 sop = list_entry(matches.next, struct nfs4_stateowner,
2965 /* unhash_stateowner deletes so_perclient only
2966 * for openowners. */
2967 list_del(&sop->so_perclient);
2968 release_stateowner(sop);
2971 nfs4_unlock_state();
2975 static inline struct nfs4_client_reclaim *
2978 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
2982 nfs4_has_reclaimed_state(const char *name)
2984 unsigned int strhashval = clientstr_hashval(name);
2985 struct nfs4_client *clp;
2987 clp = find_confirmed_client_by_str(name, strhashval);
2992 * failure => all reset bets are off, nfserr_no_grace...
2995 nfs4_client_to_reclaim(const char *name)
2997 unsigned int strhashval;
2998 struct nfs4_client_reclaim *crp = NULL;
3000 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3001 crp = alloc_reclaim();
3004 strhashval = clientstr_hashval(name);
3005 INIT_LIST_HEAD(&crp->cr_strhash);
3006 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3007 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3008 reclaim_str_hashtbl_size++;
3013 nfs4_release_reclaim(void)
3015 struct nfs4_client_reclaim *crp = NULL;
3018 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3019 while (!list_empty(&reclaim_str_hashtbl[i])) {
3020 crp = list_entry(reclaim_str_hashtbl[i].next,
3021 struct nfs4_client_reclaim, cr_strhash);
3022 list_del(&crp->cr_strhash);
3024 reclaim_str_hashtbl_size--;
3027 BUG_ON(reclaim_str_hashtbl_size);
3031 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3032 static struct nfs4_client_reclaim *
3033 nfs4_find_reclaim_client(clientid_t *clid)
3035 unsigned int strhashval;
3036 struct nfs4_client *clp;
3037 struct nfs4_client_reclaim *crp = NULL;
3040 /* find clientid in conf_id_hashtbl */
3041 clp = find_confirmed_client(clid);
3045 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3046 clp->cl_name.len, clp->cl_name.data,
3049 /* find clp->cl_name in reclaim_str_hashtbl */
3050 strhashval = clientstr_hashval(clp->cl_recdir);
3051 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3052 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3060 * Called from OPEN. Look for clientid in reclaim list.
3063 nfs4_check_open_reclaim(clientid_t *clid)
3065 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3068 /* initialization to perform at module load time: */
3071 nfs4_state_init(void)
3075 status = nfsd4_init_slabs();
3078 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3079 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3080 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3081 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3082 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3084 for (i = 0; i < FILE_HASH_SIZE; i++) {
3085 INIT_LIST_HEAD(&file_hashtbl[i]);
3087 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3088 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3089 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3091 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3092 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3093 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3095 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3096 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3097 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3099 memset(&onestateid, ~0, sizeof(stateid_t));
3100 INIT_LIST_HEAD(&close_lru);
3101 INIT_LIST_HEAD(&client_lru);
3102 INIT_LIST_HEAD(&del_recall_lru);
3103 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3104 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3105 reclaim_str_hashtbl_size = 0;
3110 nfsd4_load_reboot_recovery_data(void)
3115 nfsd4_init_recdir(user_recovery_dirname);
3116 status = nfsd4_recdir_load();
3117 nfs4_unlock_state();
3119 printk("NFSD: Failure reading reboot recovery data\n");
3123 get_nfs4_grace_period(void)
3125 return max(user_lease_time, lease_time) * HZ;
3129 * Since the lifetime of a delegation isn't limited to that of an open, a
3130 * client may quite reasonably hang on to a delegation as long as it has
3131 * the inode cached. This becomes an obvious problem the first time a
3132 * client's inode cache approaches the size of the server's total memory.
3134 * For now we avoid this problem by imposing a hard limit on the number
3135 * of delegations, which varies according to the server's memory size.
3138 set_max_delegations(void)
3141 * Allow at most 4 delegations per megabyte of RAM. Quick
3142 * estimates suggest that in the worst case (where every delegation
3143 * is for a different inode), a delegation could take about 1.5K,
3144 * giving a worst case usage of about 6% of memory.
3146 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3149 /* initialization to perform when the nfsd service is started: */
3152 __nfs4_state_start(void)
3154 unsigned long grace_time;
3156 boot_time = get_seconds();
3157 grace_time = get_nfs_grace_period();
3158 lease_time = user_lease_time;
3160 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3162 laundry_wq = create_singlethread_workqueue("nfsd4");
3163 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3164 set_max_delegations();
3168 nfs4_state_start(void)
3172 nfsd4_load_reboot_recovery_data();
3173 __nfs4_state_start();
3185 nfs4_lease_time(void)
3191 __nfs4_state_shutdown(void)
3194 struct nfs4_client *clp = NULL;
3195 struct nfs4_delegation *dp = NULL;
3196 struct list_head *pos, *next, reaplist;
3198 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3199 while (!list_empty(&conf_id_hashtbl[i])) {
3200 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3203 while (!list_empty(&unconf_str_hashtbl[i])) {
3204 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3208 INIT_LIST_HEAD(&reaplist);
3209 spin_lock(&recall_lock);
3210 list_for_each_safe(pos, next, &del_recall_lru) {
3211 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3212 list_move(&dp->dl_recall_lru, &reaplist);
3214 spin_unlock(&recall_lock);
3215 list_for_each_safe(pos, next, &reaplist) {
3216 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3217 list_del_init(&dp->dl_recall_lru);
3218 unhash_delegation(dp);
3221 nfsd4_shutdown_recdir();
3226 nfs4_state_shutdown(void)
3228 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3229 destroy_workqueue(laundry_wq);
3231 nfs4_release_reclaim();
3232 __nfs4_state_shutdown();
3233 nfs4_unlock_state();
3237 nfs4_set_recdir(char *recdir)
3240 strcpy(user_recovery_dirname, recdir);
3241 nfs4_unlock_state();
3245 * Change the NFSv4 recovery directory to recdir.
3248 nfs4_reset_recoverydir(char *recdir)
3251 struct nameidata nd;
3253 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3257 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3258 nfs4_set_recdir(recdir);
3266 * Called when leasetime is changed.
3268 * The only way the protocol gives us to handle on-the-fly lease changes is to
3269 * simulate a reboot. Instead of doing that, we just wait till the next time
3270 * we start to register any changes in lease time. If the administrator
3271 * really wants to change the lease time *now*, they can go ahead and bring
3272 * nfsd down and then back up again after changing the lease time.
3275 nfs4_reset_lease(time_t leasetime)
3278 user_lease_time = leasetime;