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) &&
839 (same_verf(&unconf->cl_confirm, &confirm)) &&
840 (same_verf(&conf->cl_verifier, &unconf->cl_verifier)) &&
841 (!same_verf(&conf->cl_confirm, &unconf->cl_confirm))) {
843 * RFC 3530 14.2.34 CASE 1:
846 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
847 status = nfserr_clid_inuse;
849 /* XXX: We just turn off callbacks until we can handle
850 * change request correctly. */
851 atomic_set(&conf->cl_callback.cb_set, 0);
853 nfsd4_remove_clid_dir(unconf);
854 expire_client(unconf);
858 } else if ((conf && !unconf) ||
860 !same_verf(&conf->cl_verifier, &unconf->cl_verifier))) {
862 * RFC 3530 14.2.34 CASE 2:
863 * probable retransmitted request; play it safe and
866 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
867 status = nfserr_clid_inuse;
870 } else if (!conf && unconf
871 && same_verf(&unconf->cl_confirm, &confirm)) {
873 * RFC 3530 14.2.34 CASE 3:
874 * Normal case; new or rebooted client:
876 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
877 status = nfserr_clid_inuse;
880 clientstr_hashval(unconf->cl_recdir);
881 conf = find_confirmed_client_by_str(unconf->cl_recdir,
884 nfsd4_remove_clid_dir(conf);
887 move_to_confirmed(unconf);
889 nfsd4_probe_callback(conf);
892 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
893 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
896 * RFC 3530 14.2.34 CASE 4:
897 * Client probably hasn't noticed that we rebooted yet.
899 status = nfserr_stale_clientid;
901 /* check that we have hit one of the cases...*/
902 status = nfserr_clid_inuse;
909 /* OPEN Share state helper functions */
910 static inline struct nfs4_file *
911 alloc_init_file(struct inode *ino)
913 struct nfs4_file *fp;
914 unsigned int hashval = file_hashval(ino);
916 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
918 kref_init(&fp->fi_ref);
919 INIT_LIST_HEAD(&fp->fi_hash);
920 INIT_LIST_HEAD(&fp->fi_stateids);
921 INIT_LIST_HEAD(&fp->fi_delegations);
922 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
923 fp->fi_inode = igrab(ino);
924 fp->fi_id = current_fileid++;
925 fp->fi_had_conflict = false;
932 nfsd4_free_slab(struct kmem_cache **slab)
936 kmem_cache_destroy(*slab);
941 nfsd4_free_slabs(void)
943 nfsd4_free_slab(&stateowner_slab);
944 nfsd4_free_slab(&file_slab);
945 nfsd4_free_slab(&stateid_slab);
946 nfsd4_free_slab(&deleg_slab);
950 nfsd4_init_slabs(void)
952 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
953 sizeof(struct nfs4_stateowner), 0, 0, NULL);
954 if (stateowner_slab == NULL)
956 file_slab = kmem_cache_create("nfsd4_files",
957 sizeof(struct nfs4_file), 0, 0, NULL);
958 if (file_slab == NULL)
960 stateid_slab = kmem_cache_create("nfsd4_stateids",
961 sizeof(struct nfs4_stateid), 0, 0, NULL);
962 if (stateid_slab == NULL)
964 deleg_slab = kmem_cache_create("nfsd4_delegations",
965 sizeof(struct nfs4_delegation), 0, 0, NULL);
966 if (deleg_slab == NULL)
971 dprintk("nfsd4: out of memory while initializing nfsv4\n");
976 nfs4_free_stateowner(struct kref *kref)
978 struct nfs4_stateowner *sop =
979 container_of(kref, struct nfs4_stateowner, so_ref);
980 kfree(sop->so_owner.data);
981 kmem_cache_free(stateowner_slab, sop);
984 static inline struct nfs4_stateowner *
985 alloc_stateowner(struct xdr_netobj *owner)
987 struct nfs4_stateowner *sop;
989 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
990 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
991 memcpy(sop->so_owner.data, owner->data, owner->len);
992 sop->so_owner.len = owner->len;
993 kref_init(&sop->so_ref);
996 kmem_cache_free(stateowner_slab, sop);
1001 static struct nfs4_stateowner *
1002 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1003 struct nfs4_stateowner *sop;
1004 struct nfs4_replay *rp;
1005 unsigned int idhashval;
1007 if (!(sop = alloc_stateowner(&open->op_owner)))
1009 idhashval = ownerid_hashval(current_ownerid);
1010 INIT_LIST_HEAD(&sop->so_idhash);
1011 INIT_LIST_HEAD(&sop->so_strhash);
1012 INIT_LIST_HEAD(&sop->so_perclient);
1013 INIT_LIST_HEAD(&sop->so_stateids);
1014 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1015 INIT_LIST_HEAD(&sop->so_close_lru);
1017 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1018 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1019 list_add(&sop->so_perclient, &clp->cl_openowners);
1020 sop->so_is_open_owner = 1;
1021 sop->so_id = current_ownerid++;
1022 sop->so_client = clp;
1023 sop->so_seqid = open->op_seqid;
1024 sop->so_confirmed = 0;
1025 rp = &sop->so_replay;
1026 rp->rp_status = nfserr_serverfault;
1028 rp->rp_buf = rp->rp_ibuf;
1033 release_stateid_lockowners(struct nfs4_stateid *open_stp)
1035 struct nfs4_stateowner *lock_sop;
1037 while (!list_empty(&open_stp->st_lockowners)) {
1038 lock_sop = list_entry(open_stp->st_lockowners.next,
1039 struct nfs4_stateowner, so_perstateid);
1040 /* list_del(&open_stp->st_lockowners); */
1041 BUG_ON(lock_sop->so_is_open_owner);
1042 release_stateowner(lock_sop);
1047 unhash_stateowner(struct nfs4_stateowner *sop)
1049 struct nfs4_stateid *stp;
1051 list_del(&sop->so_idhash);
1052 list_del(&sop->so_strhash);
1053 if (sop->so_is_open_owner)
1054 list_del(&sop->so_perclient);
1055 list_del(&sop->so_perstateid);
1056 while (!list_empty(&sop->so_stateids)) {
1057 stp = list_entry(sop->so_stateids.next,
1058 struct nfs4_stateid, st_perstateowner);
1059 if (sop->so_is_open_owner)
1060 release_stateid(stp, OPEN_STATE);
1062 release_stateid(stp, LOCK_STATE);
1067 release_stateowner(struct nfs4_stateowner *sop)
1069 unhash_stateowner(sop);
1070 list_del(&sop->so_close_lru);
1071 nfs4_put_stateowner(sop);
1075 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1076 struct nfs4_stateowner *sop = open->op_stateowner;
1077 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1079 INIT_LIST_HEAD(&stp->st_hash);
1080 INIT_LIST_HEAD(&stp->st_perstateowner);
1081 INIT_LIST_HEAD(&stp->st_lockowners);
1082 INIT_LIST_HEAD(&stp->st_perfile);
1083 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1084 list_add(&stp->st_perstateowner, &sop->so_stateids);
1085 list_add(&stp->st_perfile, &fp->fi_stateids);
1086 stp->st_stateowner = sop;
1089 stp->st_stateid.si_boot = boot_time;
1090 stp->st_stateid.si_stateownerid = sop->so_id;
1091 stp->st_stateid.si_fileid = fp->fi_id;
1092 stp->st_stateid.si_generation = 0;
1093 stp->st_access_bmap = 0;
1094 stp->st_deny_bmap = 0;
1095 __set_bit(open->op_share_access, &stp->st_access_bmap);
1096 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1097 stp->st_openstp = NULL;
1101 release_stateid(struct nfs4_stateid *stp, int flags)
1103 struct file *filp = stp->st_vfs_file;
1105 list_del(&stp->st_hash);
1106 list_del(&stp->st_perfile);
1107 list_del(&stp->st_perstateowner);
1108 if (flags & OPEN_STATE) {
1109 release_stateid_lockowners(stp);
1110 stp->st_vfs_file = NULL;
1112 } else if (flags & LOCK_STATE)
1113 locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
1114 put_nfs4_file(stp->st_file);
1115 kmem_cache_free(stateid_slab, stp);
1119 move_to_close_lru(struct nfs4_stateowner *sop)
1121 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1123 list_move_tail(&sop->so_close_lru, &close_lru);
1124 sop->so_time = get_seconds();
1128 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1131 return (sop->so_owner.len == owner->len) &&
1132 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1133 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1136 static struct nfs4_stateowner *
1137 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1139 struct nfs4_stateowner *so = NULL;
1141 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1142 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1148 /* search file_hashtbl[] for file */
1149 static struct nfs4_file *
1150 find_file(struct inode *ino)
1152 unsigned int hashval = file_hashval(ino);
1153 struct nfs4_file *fp;
1155 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1156 if (fp->fi_inode == ino) {
1164 static int access_valid(u32 x)
1166 return (x > 0 && x < 4);
1169 static int deny_valid(u32 x)
1171 return (x >= 0 && x < 5);
1175 set_access(unsigned int *access, unsigned long bmap) {
1179 for (i = 1; i < 4; i++) {
1180 if (test_bit(i, &bmap))
1186 set_deny(unsigned int *deny, unsigned long bmap) {
1190 for (i = 0; i < 4; i++) {
1191 if (test_bit(i, &bmap))
1197 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1198 unsigned int access, deny;
1200 set_access(&access, stp->st_access_bmap);
1201 set_deny(&deny, stp->st_deny_bmap);
1202 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1208 * Called to check deny when READ with all zero stateid or
1209 * WRITE with all zero or all one stateid
1212 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
1214 struct inode *ino = current_fh->fh_dentry->d_inode;
1215 struct nfs4_file *fp;
1216 struct nfs4_stateid *stp;
1219 dprintk("NFSD: nfs4_share_conflict\n");
1221 fp = find_file(ino);
1224 ret = nfserr_locked;
1225 /* Search for conflicting share reservations */
1226 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
1227 if (test_bit(deny_type, &stp->st_deny_bmap) ||
1228 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
1238 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
1240 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
1241 put_write_access(filp->f_path.dentry->d_inode);
1242 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
1247 * Recall a delegation
1250 do_recall(void *__dp)
1252 struct nfs4_delegation *dp = __dp;
1254 dp->dl_file->fi_had_conflict = true;
1255 nfsd4_cb_recall(dp);
1260 * Spawn a thread to perform a recall on the delegation represented
1261 * by the lease (file_lock)
1263 * Called from break_lease() with lock_kernel() held.
1264 * Note: we assume break_lease will only call this *once* for any given
1268 void nfsd_break_deleg_cb(struct file_lock *fl)
1270 struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
1271 struct task_struct *t;
1273 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
1277 /* We're assuming the state code never drops its reference
1278 * without first removing the lease. Since we're in this lease
1279 * callback (and since the lease code is serialized by the kernel
1280 * lock) we know the server hasn't removed the lease yet, we know
1281 * it's safe to take a reference: */
1282 atomic_inc(&dp->dl_count);
1283 atomic_inc(&dp->dl_client->cl_count);
1285 spin_lock(&recall_lock);
1286 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
1287 spin_unlock(&recall_lock);
1289 /* only place dl_time is set. protected by lock_kernel*/
1290 dp->dl_time = get_seconds();
1293 * We don't want the locks code to timeout the lease for us;
1294 * we'll remove it ourself if the delegation isn't returned
1297 fl->fl_break_time = 0;
1299 t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
1301 struct nfs4_client *clp = dp->dl_client;
1303 printk(KERN_INFO "NFSD: Callback thread failed for "
1304 "for client (clientid %08x/%08x)\n",
1305 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1306 put_nfs4_client(dp->dl_client);
1307 nfs4_put_delegation(dp);
1312 * The file_lock is being reapd.
1314 * Called by locks_free_lock() with lock_kernel() held.
1317 void nfsd_release_deleg_cb(struct file_lock *fl)
1319 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
1321 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
1323 if (!(fl->fl_flags & FL_LEASE) || !dp)
1325 dp->dl_flock = NULL;
1329 * Set the delegation file_lock back pointer.
1331 * Called from setlease() with lock_kernel() held.
1334 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
1336 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
1338 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
1345 * Called from setlease() with lock_kernel() held
1348 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
1350 struct nfs4_delegation *onlistd =
1351 (struct nfs4_delegation *)onlist->fl_owner;
1352 struct nfs4_delegation *tryd =
1353 (struct nfs4_delegation *)try->fl_owner;
1355 if (onlist->fl_lmops != try->fl_lmops)
1358 return onlistd->dl_client == tryd->dl_client;
1363 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
1366 return lease_modify(onlist, arg);
1371 static struct lock_manager_operations nfsd_lease_mng_ops = {
1372 .fl_break = nfsd_break_deleg_cb,
1373 .fl_release_private = nfsd_release_deleg_cb,
1374 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
1375 .fl_mylease = nfsd_same_client_deleg_cb,
1376 .fl_change = nfsd_change_deleg_cb,
1381 nfsd4_process_open1(struct nfsd4_open *open)
1383 clientid_t *clientid = &open->op_clientid;
1384 struct nfs4_client *clp = NULL;
1385 unsigned int strhashval;
1386 struct nfs4_stateowner *sop = NULL;
1388 if (!check_name(open->op_owner))
1389 return nfserr_inval;
1391 if (STALE_CLIENTID(&open->op_clientid))
1392 return nfserr_stale_clientid;
1394 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
1395 sop = find_openstateowner_str(strhashval, open);
1396 open->op_stateowner = sop;
1398 /* Make sure the client's lease hasn't expired. */
1399 clp = find_confirmed_client(clientid);
1401 return nfserr_expired;
1404 if (!sop->so_confirmed) {
1405 /* Replace unconfirmed owners without checking for replay. */
1406 clp = sop->so_client;
1407 release_stateowner(sop);
1408 open->op_stateowner = NULL;
1411 if (open->op_seqid == sop->so_seqid - 1) {
1412 if (sop->so_replay.rp_buflen)
1413 return nfserr_replay_me;
1414 /* The original OPEN failed so spectacularly
1415 * that we don't even have replay data saved!
1416 * Therefore, we have no choice but to continue
1417 * processing this OPEN; presumably, we'll
1418 * fail again for the same reason.
1420 dprintk("nfsd4_process_open1: replay with no replay cache\n");
1423 if (open->op_seqid != sop->so_seqid)
1424 return nfserr_bad_seqid;
1426 if (open->op_stateowner == NULL) {
1427 sop = alloc_init_open_stateowner(strhashval, clp, open);
1429 return nfserr_resource;
1430 open->op_stateowner = sop;
1432 list_del_init(&sop->so_close_lru);
1433 renew_client(sop->so_client);
1437 static inline __be32
1438 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
1440 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
1441 return nfserr_openmode;
1446 static struct nfs4_delegation *
1447 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
1449 struct nfs4_delegation *dp;
1451 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
1452 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
1459 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
1460 struct nfs4_delegation **dp)
1463 __be32 status = nfserr_bad_stateid;
1465 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
1468 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
1469 RD_STATE : WR_STATE;
1470 status = nfs4_check_delegmode(*dp, flags);
1474 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
1478 open->op_stateowner->so_confirmed = 1;
1483 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
1485 struct nfs4_stateid *local;
1486 __be32 status = nfserr_share_denied;
1487 struct nfs4_stateowner *sop = open->op_stateowner;
1489 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
1490 /* ignore lock owners */
1491 if (local->st_stateowner->so_is_open_owner == 0)
1493 /* remember if we have seen this open owner */
1494 if (local->st_stateowner == sop)
1496 /* check for conflicting share reservations */
1497 if (!test_share(local, open))
1505 static inline struct nfs4_stateid *
1506 nfs4_alloc_stateid(void)
1508 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
1512 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
1513 struct nfs4_delegation *dp,
1514 struct svc_fh *cur_fh, int flags)
1516 struct nfs4_stateid *stp;
1518 stp = nfs4_alloc_stateid();
1520 return nfserr_resource;
1523 get_file(dp->dl_vfs_file);
1524 stp->st_vfs_file = dp->dl_vfs_file;
1527 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
1530 if (status == nfserr_dropit)
1531 status = nfserr_jukebox;
1532 kmem_cache_free(stateid_slab, stp);
1540 static inline __be32
1541 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
1542 struct nfsd4_open *open)
1544 struct iattr iattr = {
1545 .ia_valid = ATTR_SIZE,
1548 if (!open->op_truncate)
1550 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
1551 return nfserr_inval;
1552 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
1556 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
1558 struct file *filp = stp->st_vfs_file;
1559 struct inode *inode = filp->f_path.dentry->d_inode;
1560 unsigned int share_access, new_writer;
1563 set_access(&share_access, stp->st_access_bmap);
1564 new_writer = (~share_access) & open->op_share_access
1565 & NFS4_SHARE_ACCESS_WRITE;
1568 int err = get_write_access(inode);
1570 return nfserrno(err);
1572 status = nfsd4_truncate(rqstp, cur_fh, open);
1575 put_write_access(inode);
1578 /* remember the open */
1579 filp->f_mode |= open->op_share_access;
1580 set_bit(open->op_share_access, &stp->st_access_bmap);
1581 set_bit(open->op_share_deny, &stp->st_deny_bmap);
1588 nfs4_set_claim_prev(struct nfsd4_open *open)
1590 open->op_stateowner->so_confirmed = 1;
1591 open->op_stateowner->so_client->cl_firststate = 1;
1595 * Attempt to hand out a delegation.
1598 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
1600 struct nfs4_delegation *dp;
1601 struct nfs4_stateowner *sop = stp->st_stateowner;
1602 struct nfs4_callback *cb = &sop->so_client->cl_callback;
1603 struct file_lock fl, *flp = &fl;
1604 int status, flag = 0;
1606 flag = NFS4_OPEN_DELEGATE_NONE;
1607 open->op_recall = 0;
1608 switch (open->op_claim_type) {
1609 case NFS4_OPEN_CLAIM_PREVIOUS:
1610 if (!atomic_read(&cb->cb_set))
1611 open->op_recall = 1;
1612 flag = open->op_delegate_type;
1613 if (flag == NFS4_OPEN_DELEGATE_NONE)
1616 case NFS4_OPEN_CLAIM_NULL:
1617 /* Let's not give out any delegations till everyone's
1618 * had the chance to reclaim theirs.... */
1619 if (nfs4_in_grace())
1621 if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
1623 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1624 flag = NFS4_OPEN_DELEGATE_WRITE;
1626 flag = NFS4_OPEN_DELEGATE_READ;
1632 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
1634 flag = NFS4_OPEN_DELEGATE_NONE;
1637 locks_init_lock(&fl);
1638 fl.fl_lmops = &nfsd_lease_mng_ops;
1639 fl.fl_flags = FL_LEASE;
1640 fl.fl_end = OFFSET_MAX;
1641 fl.fl_owner = (fl_owner_t)dp;
1642 fl.fl_file = stp->st_vfs_file;
1643 fl.fl_pid = current->tgid;
1645 /* vfs_setlease checks to see if delegation should be handed out.
1646 * the lock_manager callbacks fl_mylease and fl_change are used
1648 if ((status = vfs_setlease(stp->st_vfs_file,
1649 flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK, &flp))) {
1650 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
1651 unhash_delegation(dp);
1652 flag = NFS4_OPEN_DELEGATE_NONE;
1656 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
1658 dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
1659 dp->dl_stateid.si_boot,
1660 dp->dl_stateid.si_stateownerid,
1661 dp->dl_stateid.si_fileid,
1662 dp->dl_stateid.si_generation);
1664 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
1665 && flag == NFS4_OPEN_DELEGATE_NONE
1666 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
1667 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
1668 open->op_delegate_type = flag;
1672 * called with nfs4_lock_state() held.
1675 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
1677 struct nfs4_file *fp = NULL;
1678 struct inode *ino = current_fh->fh_dentry->d_inode;
1679 struct nfs4_stateid *stp = NULL;
1680 struct nfs4_delegation *dp = NULL;
1683 status = nfserr_inval;
1684 if (!access_valid(open->op_share_access)
1685 || !deny_valid(open->op_share_deny))
1688 * Lookup file; if found, lookup stateid and check open request,
1689 * and check for delegations in the process of being recalled.
1690 * If not found, create the nfs4_file struct
1692 fp = find_file(ino);
1694 if ((status = nfs4_check_open(fp, open, &stp)))
1696 status = nfs4_check_deleg(fp, open, &dp);
1700 status = nfserr_bad_stateid;
1701 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
1703 status = nfserr_resource;
1704 fp = alloc_init_file(ino);
1710 * OPEN the file, or upgrade an existing OPEN.
1711 * If truncate fails, the OPEN fails.
1714 /* Stateid was found, this is an OPEN upgrade */
1715 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
1718 update_stateid(&stp->st_stateid);
1720 /* Stateid was not found, this is a new OPEN */
1722 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
1724 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
1726 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
1729 init_stateid(stp, fp, open);
1730 status = nfsd4_truncate(rqstp, current_fh, open);
1732 release_stateid(stp, OPEN_STATE);
1736 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
1739 * Attempt to hand out a delegation. No error return, because the
1740 * OPEN succeeds even if we fail.
1742 nfs4_open_delegation(current_fh, open, stp);
1746 dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
1747 stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
1748 stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
1752 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
1753 nfs4_set_claim_prev(open);
1755 * To finish the open response, we just need to set the rflags.
1757 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
1758 if (!open->op_stateowner->so_confirmed)
1759 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
1764 static struct workqueue_struct *laundry_wq;
1765 static void laundromat_main(struct work_struct *);
1766 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
1769 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1772 struct nfs4_client *clp;
1776 dprintk("process_renew(%08x/%08x): starting\n",
1777 clid->cl_boot, clid->cl_id);
1778 status = nfserr_stale_clientid;
1779 if (STALE_CLIENTID(clid))
1781 clp = find_confirmed_client(clid);
1782 status = nfserr_expired;
1784 /* We assume the client took too long to RENEW. */
1785 dprintk("nfsd4_renew: clientid not found!\n");
1789 status = nfserr_cb_path_down;
1790 if (!list_empty(&clp->cl_delegations)
1791 && !atomic_read(&clp->cl_callback.cb_set))
1795 nfs4_unlock_state();
1802 dprintk("NFSD: end of grace period\n");
1803 nfsd4_recdir_purge_old();
1808 nfs4_laundromat(void)
1810 struct nfs4_client *clp;
1811 struct nfs4_stateowner *sop;
1812 struct nfs4_delegation *dp;
1813 struct list_head *pos, *next, reaplist;
1814 time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
1815 time_t t, clientid_val = NFSD_LEASE_TIME;
1816 time_t u, test_val = NFSD_LEASE_TIME;
1820 dprintk("NFSD: laundromat service - starting\n");
1823 list_for_each_safe(pos, next, &client_lru) {
1824 clp = list_entry(pos, struct nfs4_client, cl_lru);
1825 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
1826 t = clp->cl_time - cutoff;
1827 if (clientid_val > t)
1831 dprintk("NFSD: purging unused client (clientid %08x)\n",
1832 clp->cl_clientid.cl_id);
1833 nfsd4_remove_clid_dir(clp);
1836 INIT_LIST_HEAD(&reaplist);
1837 spin_lock(&recall_lock);
1838 list_for_each_safe(pos, next, &del_recall_lru) {
1839 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1840 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
1841 u = dp->dl_time - cutoff;
1846 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
1848 list_move(&dp->dl_recall_lru, &reaplist);
1850 spin_unlock(&recall_lock);
1851 list_for_each_safe(pos, next, &reaplist) {
1852 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
1853 list_del_init(&dp->dl_recall_lru);
1854 unhash_delegation(dp);
1856 test_val = NFSD_LEASE_TIME;
1857 list_for_each_safe(pos, next, &close_lru) {
1858 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
1859 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
1860 u = sop->so_time - cutoff;
1865 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
1867 release_stateowner(sop);
1869 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
1870 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
1871 nfs4_unlock_state();
1872 return clientid_val;
1876 laundromat_main(struct work_struct *not_used)
1880 t = nfs4_laundromat();
1881 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
1882 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
1885 static struct nfs4_stateowner *
1886 search_close_lru(u32 st_id, int flags)
1888 struct nfs4_stateowner *local = NULL;
1890 if (flags & CLOSE_STATE) {
1891 list_for_each_entry(local, &close_lru, so_close_lru) {
1892 if (local->so_id == st_id)
1900 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
1902 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
1906 STALE_STATEID(stateid_t *stateid)
1908 if (stateid->si_boot == boot_time)
1910 dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
1911 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
1912 stateid->si_generation);
1917 access_permit_read(unsigned long access_bmap)
1919 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
1920 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
1921 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
1925 access_permit_write(unsigned long access_bmap)
1927 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
1928 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
1932 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
1934 __be32 status = nfserr_openmode;
1936 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
1938 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
1945 static inline __be32
1946 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
1948 /* Trying to call delegreturn with a special stateid? Yuch: */
1949 if (!(flags & (RD_STATE | WR_STATE)))
1950 return nfserr_bad_stateid;
1951 else if (ONE_STATEID(stateid) && (flags & RD_STATE))
1953 else if (nfs4_in_grace()) {
1954 /* Answer in remaining cases depends on existance of
1955 * conflicting state; so we must wait out the grace period. */
1956 return nfserr_grace;
1957 } else if (flags & WR_STATE)
1958 return nfs4_share_conflict(current_fh,
1959 NFS4_SHARE_DENY_WRITE);
1960 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
1961 return nfs4_share_conflict(current_fh,
1962 NFS4_SHARE_DENY_READ);
1966 * Allow READ/WRITE during grace period on recovered state only for files
1967 * that are not able to provide mandatory locking.
1970 io_during_grace_disallowed(struct inode *inode, int flags)
1972 return nfs4_in_grace() && (flags & (RD_STATE | WR_STATE))
1973 && mandatory_lock(inode);
1977 * Checks for stateid operations
1980 nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
1982 struct nfs4_stateid *stp = NULL;
1983 struct nfs4_delegation *dp = NULL;
1985 struct inode *ino = current_fh->fh_dentry->d_inode;
1988 dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
1989 stateid->si_boot, stateid->si_stateownerid,
1990 stateid->si_fileid, stateid->si_generation);
1994 if (io_during_grace_disallowed(ino, flags))
1995 return nfserr_grace;
1997 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
1998 return check_special_stateids(current_fh, stateid, flags);
2001 status = nfserr_stale_stateid;
2002 if (STALE_STATEID(stateid))
2006 status = nfserr_bad_stateid;
2007 if (!stateid->si_fileid) { /* delegation stateid */
2008 if(!(dp = find_delegation_stateid(ino, stateid))) {
2009 dprintk("NFSD: delegation stateid not found\n");
2012 stidp = &dp->dl_stateid;
2013 } else { /* open or lock stateid */
2014 if (!(stp = find_stateid(stateid, flags))) {
2015 dprintk("NFSD: open or lock stateid not found\n");
2018 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
2020 if (!stp->st_stateowner->so_confirmed)
2022 stidp = &stp->st_stateid;
2024 if (stateid->si_generation > stidp->si_generation)
2028 status = nfserr_old_stateid;
2029 if (stateid->si_generation < stidp->si_generation)
2032 if ((status = nfs4_check_openmode(stp,flags)))
2034 renew_client(stp->st_stateowner->so_client);
2036 *filpp = stp->st_vfs_file;
2038 if ((status = nfs4_check_delegmode(dp, flags)))
2040 renew_client(dp->dl_client);
2041 if (flags & DELEG_RET)
2042 unhash_delegation(dp);
2044 *filpp = dp->dl_vfs_file;
2054 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2055 RD_STATE : WR_STATE;
2059 * Checks for sequence id mutating operations.
2062 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)
2064 struct nfs4_stateid *stp;
2065 struct nfs4_stateowner *sop;
2067 dprintk("NFSD: preprocess_seqid_op: seqid=%d "
2068 "stateid = (%08x/%08x/%08x/%08x)\n", seqid,
2069 stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
2070 stateid->si_generation);
2075 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2076 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2077 return nfserr_bad_stateid;
2080 if (STALE_STATEID(stateid))
2081 return nfserr_stale_stateid;
2083 * We return BAD_STATEID if filehandle doesn't match stateid,
2084 * the confirmed flag is incorrecly set, or the generation
2085 * number is incorrect.
2087 stp = find_stateid(stateid, flags);
2090 * Also, we should make sure this isn't just the result of
2093 sop = search_close_lru(stateid->si_stateownerid, flags);
2095 return nfserr_bad_stateid;
2101 struct nfs4_stateowner *sop = stp->st_stateowner;
2102 clientid_t *lockclid = &lock->v.new.clientid;
2103 struct nfs4_client *clp = sop->so_client;
2107 lkflg = setlkflg(lock->lk_type);
2109 if (lock->lk_is_new) {
2110 if (!sop->so_is_open_owner)
2111 return nfserr_bad_stateid;
2112 if (!same_clid(&clp->cl_clientid, lockclid))
2113 return nfserr_bad_stateid;
2114 /* stp is the open stateid */
2115 status = nfs4_check_openmode(stp, lkflg);
2119 /* stp is the lock stateid */
2120 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2126 if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp)) {
2127 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2128 return nfserr_bad_stateid;
2132 *sopp = sop = stp->st_stateowner;
2135 * We now validate the seqid and stateid generation numbers.
2136 * For the moment, we ignore the possibility of
2137 * generation number wraparound.
2139 if (seqid != sop->so_seqid)
2142 if (sop->so_confirmed && flags & CONFIRM) {
2143 dprintk("NFSD: preprocess_seqid_op: expected"
2144 " unconfirmed stateowner!\n");
2145 return nfserr_bad_stateid;
2147 if (!sop->so_confirmed && !(flags & CONFIRM)) {
2148 dprintk("NFSD: preprocess_seqid_op: stateowner not"
2149 " confirmed yet!\n");
2150 return nfserr_bad_stateid;
2152 if (stateid->si_generation > stp->st_stateid.si_generation) {
2153 dprintk("NFSD: preprocess_seqid_op: future stateid?!\n");
2154 return nfserr_bad_stateid;
2157 if (stateid->si_generation < stp->st_stateid.si_generation) {
2158 dprintk("NFSD: preprocess_seqid_op: old stateid!\n");
2159 return nfserr_old_stateid;
2161 renew_client(sop->so_client);
2165 if (seqid == sop->so_seqid - 1) {
2166 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
2167 /* indicate replay to calling function */
2168 return nfserr_replay_me;
2170 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
2171 sop->so_seqid, seqid);
2173 return nfserr_bad_seqid;
2177 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2178 struct nfsd4_open_confirm *oc)
2181 struct nfs4_stateowner *sop;
2182 struct nfs4_stateid *stp;
2184 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
2185 (int)cstate->current_fh.fh_dentry->d_name.len,
2186 cstate->current_fh.fh_dentry->d_name.name);
2188 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
2194 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2195 oc->oc_seqid, &oc->oc_req_stateid,
2196 CHECK_FH | CONFIRM | OPEN_STATE,
2197 &oc->oc_stateowner, &stp, NULL)))
2200 sop = oc->oc_stateowner;
2201 sop->so_confirmed = 1;
2202 update_stateid(&stp->st_stateid);
2203 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
2204 dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
2205 "stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
2206 stp->st_stateid.si_boot,
2207 stp->st_stateid.si_stateownerid,
2208 stp->st_stateid.si_fileid,
2209 stp->st_stateid.si_generation);
2211 nfsd4_create_clid_dir(sop->so_client);
2213 if (oc->oc_stateowner) {
2214 nfs4_get_stateowner(oc->oc_stateowner);
2215 cstate->replay_owner = oc->oc_stateowner;
2217 nfs4_unlock_state();
2223 * unset all bits in union bitmap (bmap) that
2224 * do not exist in share (from successful OPEN_DOWNGRADE)
2227 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
2230 for (i = 1; i < 4; i++) {
2231 if ((i & access) != i)
2232 __clear_bit(i, bmap);
2237 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
2240 for (i = 0; i < 4; i++) {
2241 if ((i & deny) != i)
2242 __clear_bit(i, bmap);
2247 nfsd4_open_downgrade(struct svc_rqst *rqstp,
2248 struct nfsd4_compound_state *cstate,
2249 struct nfsd4_open_downgrade *od)
2252 struct nfs4_stateid *stp;
2253 unsigned int share_access;
2255 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
2256 (int)cstate->current_fh.fh_dentry->d_name.len,
2257 cstate->current_fh.fh_dentry->d_name.name);
2259 if (!access_valid(od->od_share_access)
2260 || !deny_valid(od->od_share_deny))
2261 return nfserr_inval;
2264 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2267 CHECK_FH | OPEN_STATE,
2268 &od->od_stateowner, &stp, NULL)))
2271 status = nfserr_inval;
2272 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
2273 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
2274 stp->st_access_bmap, od->od_share_access);
2277 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
2278 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
2279 stp->st_deny_bmap, od->od_share_deny);
2282 set_access(&share_access, stp->st_access_bmap);
2283 nfs4_file_downgrade(stp->st_vfs_file,
2284 share_access & ~od->od_share_access);
2286 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
2287 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
2289 update_stateid(&stp->st_stateid);
2290 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
2293 if (od->od_stateowner) {
2294 nfs4_get_stateowner(od->od_stateowner);
2295 cstate->replay_owner = od->od_stateowner;
2297 nfs4_unlock_state();
2302 * nfs4_unlock_state() called after encode
2305 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2306 struct nfsd4_close *close)
2309 struct nfs4_stateid *stp;
2311 dprintk("NFSD: nfsd4_close on file %.*s\n",
2312 (int)cstate->current_fh.fh_dentry->d_name.len,
2313 cstate->current_fh.fh_dentry->d_name.name);
2316 /* check close_lru for replay */
2317 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2320 CHECK_FH | OPEN_STATE | CLOSE_STATE,
2321 &close->cl_stateowner, &stp, NULL)))
2324 update_stateid(&stp->st_stateid);
2325 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
2327 /* release_stateid() calls nfsd_close() if needed */
2328 release_stateid(stp, OPEN_STATE);
2330 /* place unused nfs4_stateowners on so_close_lru list to be
2331 * released by the laundromat service after the lease period
2332 * to enable us to handle CLOSE replay
2334 if (list_empty(&close->cl_stateowner->so_stateids))
2335 move_to_close_lru(close->cl_stateowner);
2337 if (close->cl_stateowner) {
2338 nfs4_get_stateowner(close->cl_stateowner);
2339 cstate->replay_owner = close->cl_stateowner;
2341 nfs4_unlock_state();
2346 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2347 struct nfsd4_delegreturn *dr)
2351 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
2355 status = nfs4_preprocess_stateid_op(&cstate->current_fh,
2356 &dr->dr_stateid, DELEG_RET, NULL);
2357 nfs4_unlock_state();
2364 * Lock owner state (byte-range locks)
2366 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
2367 #define LOCK_HASH_BITS 8
2368 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
2369 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
2371 #define lockownerid_hashval(id) \
2372 ((id) & LOCK_HASH_MASK)
2374 static inline unsigned int
2375 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
2376 struct xdr_netobj *ownername)
2378 return (file_hashval(inode) + cl_id
2379 + opaque_hashval(ownername->data, ownername->len))
2383 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
2384 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
2385 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
2387 static struct nfs4_stateid *
2388 find_stateid(stateid_t *stid, int flags)
2390 struct nfs4_stateid *local = NULL;
2391 u32 st_id = stid->si_stateownerid;
2392 u32 f_id = stid->si_fileid;
2393 unsigned int hashval;
2395 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
2396 if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2397 hashval = stateid_hashval(st_id, f_id);
2398 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
2399 if ((local->st_stateid.si_stateownerid == st_id) &&
2400 (local->st_stateid.si_fileid == f_id))
2404 if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
2405 hashval = stateid_hashval(st_id, f_id);
2406 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
2407 if ((local->st_stateid.si_stateownerid == st_id) &&
2408 (local->st_stateid.si_fileid == f_id))
2415 static struct nfs4_delegation *
2416 find_delegation_stateid(struct inode *ino, stateid_t *stid)
2418 struct nfs4_file *fp;
2419 struct nfs4_delegation *dl;
2421 dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
2422 stid->si_boot, stid->si_stateownerid,
2423 stid->si_fileid, stid->si_generation);
2425 fp = find_file(ino);
2428 dl = find_delegation_file(fp, stid);
2434 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
2435 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
2436 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
2437 * locking, this prevents us from being completely protocol-compliant. The
2438 * real solution to this problem is to start using unsigned file offsets in
2439 * the VFS, but this is a very deep change!
2442 nfs4_transform_lock_offset(struct file_lock *lock)
2444 if (lock->fl_start < 0)
2445 lock->fl_start = OFFSET_MAX;
2446 if (lock->fl_end < 0)
2447 lock->fl_end = OFFSET_MAX;
2450 /* Hack!: For now, we're defining this just so we can use a pointer to it
2451 * as a unique cookie to identify our (NFSv4's) posix locks. */
2452 static struct lock_manager_operations nfsd_posix_mng_ops = {
2456 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
2458 struct nfs4_stateowner *sop;
2461 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
2462 sop = (struct nfs4_stateowner *) fl->fl_owner;
2463 hval = lockownerid_hashval(sop->so_id);
2464 kref_get(&sop->so_ref);
2466 deny->ld_clientid = sop->so_client->cl_clientid;
2468 deny->ld_sop = NULL;
2469 deny->ld_clientid.cl_boot = 0;
2470 deny->ld_clientid.cl_id = 0;
2472 deny->ld_start = fl->fl_start;
2473 deny->ld_length = ~(u64)0;
2474 if (fl->fl_end != ~(u64)0)
2475 deny->ld_length = fl->fl_end - fl->fl_start + 1;
2476 deny->ld_type = NFS4_READ_LT;
2477 if (fl->fl_type != F_RDLCK)
2478 deny->ld_type = NFS4_WRITE_LT;
2481 static struct nfs4_stateowner *
2482 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
2483 struct xdr_netobj *owner)
2485 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
2486 struct nfs4_stateowner *op;
2488 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
2489 if (same_owner_str(op, owner, clid))
2496 * Alloc a lock owner structure.
2497 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
2500 * strhashval = lock_ownerstr_hashval
2503 static struct nfs4_stateowner *
2504 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
2505 struct nfs4_stateowner *sop;
2506 struct nfs4_replay *rp;
2507 unsigned int idhashval;
2509 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
2511 idhashval = lockownerid_hashval(current_ownerid);
2512 INIT_LIST_HEAD(&sop->so_idhash);
2513 INIT_LIST_HEAD(&sop->so_strhash);
2514 INIT_LIST_HEAD(&sop->so_perclient);
2515 INIT_LIST_HEAD(&sop->so_stateids);
2516 INIT_LIST_HEAD(&sop->so_perstateid);
2517 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
2519 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
2520 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
2521 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
2522 sop->so_is_open_owner = 0;
2523 sop->so_id = current_ownerid++;
2524 sop->so_client = clp;
2525 /* It is the openowner seqid that will be incremented in encode in the
2526 * case of new lockowners; so increment the lock seqid manually: */
2527 sop->so_seqid = lock->lk_new_lock_seqid + 1;
2528 sop->so_confirmed = 1;
2529 rp = &sop->so_replay;
2530 rp->rp_status = nfserr_serverfault;
2532 rp->rp_buf = rp->rp_ibuf;
2536 static struct nfs4_stateid *
2537 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
2539 struct nfs4_stateid *stp;
2540 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2542 stp = nfs4_alloc_stateid();
2545 INIT_LIST_HEAD(&stp->st_hash);
2546 INIT_LIST_HEAD(&stp->st_perfile);
2547 INIT_LIST_HEAD(&stp->st_perstateowner);
2548 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
2549 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
2550 list_add(&stp->st_perfile, &fp->fi_stateids);
2551 list_add(&stp->st_perstateowner, &sop->so_stateids);
2552 stp->st_stateowner = sop;
2555 stp->st_stateid.si_boot = boot_time;
2556 stp->st_stateid.si_stateownerid = sop->so_id;
2557 stp->st_stateid.si_fileid = fp->fi_id;
2558 stp->st_stateid.si_generation = 0;
2559 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
2560 stp->st_access_bmap = open_stp->st_access_bmap;
2561 stp->st_deny_bmap = open_stp->st_deny_bmap;
2562 stp->st_openstp = open_stp;
2569 check_lock_length(u64 offset, u64 length)
2571 return ((length == 0) || ((length != ~(u64)0) &&
2572 LOFF_OVERFLOW(offset, length)));
2579 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2580 struct nfsd4_lock *lock)
2582 struct nfs4_stateowner *open_sop = NULL;
2583 struct nfs4_stateowner *lock_sop = NULL;
2584 struct nfs4_stateid *lock_stp;
2586 struct file_lock file_lock;
2587 struct file_lock conflock;
2589 unsigned int strhashval;
2593 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
2594 (long long) lock->lk_offset,
2595 (long long) lock->lk_length);
2597 if (check_lock_length(lock->lk_offset, lock->lk_length))
2598 return nfserr_inval;
2600 if ((status = fh_verify(rqstp, &cstate->current_fh,
2601 S_IFREG, MAY_LOCK))) {
2602 dprintk("NFSD: nfsd4_lock: permission denied!\n");
2608 if (lock->lk_is_new) {
2610 * Client indicates that this is a new lockowner.
2611 * Use open owner and open stateid to create lock owner and
2614 struct nfs4_stateid *open_stp = NULL;
2615 struct nfs4_file *fp;
2617 status = nfserr_stale_clientid;
2618 if (STALE_CLIENTID(&lock->lk_new_clientid))
2621 /* validate and update open stateid and open seqid */
2622 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2623 lock->lk_new_open_seqid,
2624 &lock->lk_new_open_stateid,
2625 CHECK_FH | OPEN_STATE,
2626 &lock->lk_replay_owner, &open_stp,
2630 open_sop = lock->lk_replay_owner;
2631 /* create lockowner and lock stateid */
2632 fp = open_stp->st_file;
2633 strhashval = lock_ownerstr_hashval(fp->fi_inode,
2634 open_sop->so_client->cl_clientid.cl_id,
2635 &lock->v.new.owner);
2636 /* XXX: Do we need to check for duplicate stateowners on
2637 * the same file, or should they just be allowed (and
2638 * create new stateids)? */
2639 status = nfserr_resource;
2640 lock_sop = alloc_init_lock_stateowner(strhashval,
2641 open_sop->so_client, open_stp, lock);
2642 if (lock_sop == NULL)
2644 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
2645 if (lock_stp == NULL)
2648 /* lock (lock owner + lock stateid) already exists */
2649 status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2650 lock->lk_old_lock_seqid,
2651 &lock->lk_old_lock_stateid,
2652 CHECK_FH | LOCK_STATE,
2653 &lock->lk_replay_owner, &lock_stp, lock);
2656 lock_sop = lock->lk_replay_owner;
2658 /* lock->lk_replay_owner and lock_stp have been created or found */
2659 filp = lock_stp->st_vfs_file;
2661 status = nfserr_grace;
2662 if (nfs4_in_grace() && !lock->lk_reclaim)
2664 status = nfserr_no_grace;
2665 if (!nfs4_in_grace() && lock->lk_reclaim)
2668 locks_init_lock(&file_lock);
2669 switch (lock->lk_type) {
2672 file_lock.fl_type = F_RDLCK;
2676 case NFS4_WRITEW_LT:
2677 file_lock.fl_type = F_WRLCK;
2681 status = nfserr_inval;
2684 file_lock.fl_owner = (fl_owner_t)lock_sop;
2685 file_lock.fl_pid = current->tgid;
2686 file_lock.fl_file = filp;
2687 file_lock.fl_flags = FL_POSIX;
2688 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2690 file_lock.fl_start = lock->lk_offset;
2691 if ((lock->lk_length == ~(u64)0) ||
2692 LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
2693 file_lock.fl_end = ~(u64)0;
2695 file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
2696 nfs4_transform_lock_offset(&file_lock);
2699 * Try to lock the file in the VFS.
2700 * Note: locks.c uses the BKL to protect the inode's lock list.
2703 /* XXX?: Just to divert the locks_release_private at the start of
2704 * locks_copy_lock: */
2705 locks_init_lock(&conflock);
2706 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
2708 case 0: /* success! */
2709 update_stateid(&lock_stp->st_stateid);
2710 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
2714 case (EAGAIN): /* conflock holds conflicting lock */
2715 status = nfserr_denied;
2716 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
2717 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
2720 status = nfserr_deadlock;
2723 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
2724 status = nfserr_resource;
2728 if (status && lock->lk_is_new && lock_sop)
2729 release_stateowner(lock_sop);
2730 if (lock->lk_replay_owner) {
2731 nfs4_get_stateowner(lock->lk_replay_owner);
2732 cstate->replay_owner = lock->lk_replay_owner;
2734 nfs4_unlock_state();
2742 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2743 struct nfsd4_lockt *lockt)
2745 struct inode *inode;
2747 struct file_lock file_lock;
2751 if (nfs4_in_grace())
2752 return nfserr_grace;
2754 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
2755 return nfserr_inval;
2757 lockt->lt_stateowner = NULL;
2760 status = nfserr_stale_clientid;
2761 if (STALE_CLIENTID(&lockt->lt_clientid))
2764 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
2765 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
2766 if (status == nfserr_symlink)
2767 status = nfserr_inval;
2771 inode = cstate->current_fh.fh_dentry->d_inode;
2772 locks_init_lock(&file_lock);
2773 switch (lockt->lt_type) {
2776 file_lock.fl_type = F_RDLCK;
2779 case NFS4_WRITEW_LT:
2780 file_lock.fl_type = F_WRLCK;
2783 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
2784 status = nfserr_inval;
2788 lockt->lt_stateowner = find_lockstateowner_str(inode,
2789 &lockt->lt_clientid, &lockt->lt_owner);
2790 if (lockt->lt_stateowner)
2791 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
2792 file_lock.fl_pid = current->tgid;
2793 file_lock.fl_flags = FL_POSIX;
2794 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2796 file_lock.fl_start = lockt->lt_offset;
2797 if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
2798 file_lock.fl_end = ~(u64)0;
2800 file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
2802 nfs4_transform_lock_offset(&file_lock);
2804 /* vfs_test_lock uses the struct file _only_ to resolve the inode.
2805 * since LOCKT doesn't require an OPEN, and therefore a struct
2806 * file may not exist, pass vfs_test_lock a struct file with
2807 * only the dentry:inode set.
2809 memset(&file, 0, sizeof (struct file));
2810 file.f_path.dentry = cstate->current_fh.fh_dentry;
2813 error = vfs_test_lock(&file, &file_lock);
2815 status = nfserrno(error);
2818 if (file_lock.fl_type != F_UNLCK) {
2819 status = nfserr_denied;
2820 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
2823 nfs4_unlock_state();
2828 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2829 struct nfsd4_locku *locku)
2831 struct nfs4_stateid *stp;
2832 struct file *filp = NULL;
2833 struct file_lock file_lock;
2837 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
2838 (long long) locku->lu_offset,
2839 (long long) locku->lu_length);
2841 if (check_lock_length(locku->lu_offset, locku->lu_length))
2842 return nfserr_inval;
2846 if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
2849 CHECK_FH | LOCK_STATE,
2850 &locku->lu_stateowner, &stp, NULL)))
2853 filp = stp->st_vfs_file;
2855 locks_init_lock(&file_lock);
2856 file_lock.fl_type = F_UNLCK;
2857 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
2858 file_lock.fl_pid = current->tgid;
2859 file_lock.fl_file = filp;
2860 file_lock.fl_flags = FL_POSIX;
2861 file_lock.fl_lmops = &nfsd_posix_mng_ops;
2862 file_lock.fl_start = locku->lu_offset;
2864 if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
2865 file_lock.fl_end = ~(u64)0;
2867 file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
2868 nfs4_transform_lock_offset(&file_lock);
2871 * Try to unlock the file in the VFS.
2873 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
2875 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
2879 * OK, unlock succeeded; the only thing left to do is update the stateid.
2881 update_stateid(&stp->st_stateid);
2882 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
2885 if (locku->lu_stateowner) {
2886 nfs4_get_stateowner(locku->lu_stateowner);
2887 cstate->replay_owner = locku->lu_stateowner;
2889 nfs4_unlock_state();
2893 status = nfserrno(err);
2899 * 1: locks held by lockowner
2900 * 0: no locks held by lockowner
2903 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
2905 struct file_lock **flpp;
2906 struct inode *inode = filp->f_path.dentry->d_inode;
2910 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
2911 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
2922 nfsd4_release_lockowner(struct svc_rqst *rqstp,
2923 struct nfsd4_compound_state *cstate,
2924 struct nfsd4_release_lockowner *rlockowner)
2926 clientid_t *clid = &rlockowner->rl_clientid;
2927 struct nfs4_stateowner *sop;
2928 struct nfs4_stateid *stp;
2929 struct xdr_netobj *owner = &rlockowner->rl_owner;
2930 struct list_head matches;
2934 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
2935 clid->cl_boot, clid->cl_id);
2937 /* XXX check for lease expiration */
2939 status = nfserr_stale_clientid;
2940 if (STALE_CLIENTID(clid))
2945 status = nfserr_locks_held;
2946 /* XXX: we're doing a linear search through all the lockowners.
2947 * Yipes! For now we'll just hope clients aren't really using
2948 * release_lockowner much, but eventually we have to fix these
2949 * data structures. */
2950 INIT_LIST_HEAD(&matches);
2951 for (i = 0; i < LOCK_HASH_SIZE; i++) {
2952 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
2953 if (!same_owner_str(sop, owner, clid))
2955 list_for_each_entry(stp, &sop->so_stateids,
2957 if (check_for_locks(stp->st_vfs_file, sop))
2959 /* Note: so_perclient unused for lockowners,
2960 * so it's OK to fool with here. */
2961 list_add(&sop->so_perclient, &matches);
2965 /* Clients probably won't expect us to return with some (but not all)
2966 * of the lockowner state released; so don't release any until all
2967 * have been checked. */
2969 while (!list_empty(&matches)) {
2970 sop = list_entry(matches.next, struct nfs4_stateowner,
2972 /* unhash_stateowner deletes so_perclient only
2973 * for openowners. */
2974 list_del(&sop->so_perclient);
2975 release_stateowner(sop);
2978 nfs4_unlock_state();
2982 static inline struct nfs4_client_reclaim *
2985 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
2989 nfs4_has_reclaimed_state(const char *name)
2991 unsigned int strhashval = clientstr_hashval(name);
2992 struct nfs4_client *clp;
2994 clp = find_confirmed_client_by_str(name, strhashval);
2999 * failure => all reset bets are off, nfserr_no_grace...
3002 nfs4_client_to_reclaim(const char *name)
3004 unsigned int strhashval;
3005 struct nfs4_client_reclaim *crp = NULL;
3007 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3008 crp = alloc_reclaim();
3011 strhashval = clientstr_hashval(name);
3012 INIT_LIST_HEAD(&crp->cr_strhash);
3013 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3014 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3015 reclaim_str_hashtbl_size++;
3020 nfs4_release_reclaim(void)
3022 struct nfs4_client_reclaim *crp = NULL;
3025 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3026 while (!list_empty(&reclaim_str_hashtbl[i])) {
3027 crp = list_entry(reclaim_str_hashtbl[i].next,
3028 struct nfs4_client_reclaim, cr_strhash);
3029 list_del(&crp->cr_strhash);
3031 reclaim_str_hashtbl_size--;
3034 BUG_ON(reclaim_str_hashtbl_size);
3038 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3039 static struct nfs4_client_reclaim *
3040 nfs4_find_reclaim_client(clientid_t *clid)
3042 unsigned int strhashval;
3043 struct nfs4_client *clp;
3044 struct nfs4_client_reclaim *crp = NULL;
3047 /* find clientid in conf_id_hashtbl */
3048 clp = find_confirmed_client(clid);
3052 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3053 clp->cl_name.len, clp->cl_name.data,
3056 /* find clp->cl_name in reclaim_str_hashtbl */
3057 strhashval = clientstr_hashval(clp->cl_recdir);
3058 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3059 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3067 * Called from OPEN. Look for clientid in reclaim list.
3070 nfs4_check_open_reclaim(clientid_t *clid)
3072 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3075 /* initialization to perform at module load time: */
3078 nfs4_state_init(void)
3082 status = nfsd4_init_slabs();
3085 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3086 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3087 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3088 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3089 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3091 for (i = 0; i < FILE_HASH_SIZE; i++) {
3092 INIT_LIST_HEAD(&file_hashtbl[i]);
3094 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3095 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3096 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3098 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3099 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3100 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3102 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3103 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3104 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
3106 memset(&onestateid, ~0, sizeof(stateid_t));
3107 INIT_LIST_HEAD(&close_lru);
3108 INIT_LIST_HEAD(&client_lru);
3109 INIT_LIST_HEAD(&del_recall_lru);
3110 for (i = 0; i < CLIENT_HASH_SIZE; i++)
3111 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3112 reclaim_str_hashtbl_size = 0;
3117 nfsd4_load_reboot_recovery_data(void)
3122 nfsd4_init_recdir(user_recovery_dirname);
3123 status = nfsd4_recdir_load();
3124 nfs4_unlock_state();
3126 printk("NFSD: Failure reading reboot recovery data\n");
3130 get_nfs4_grace_period(void)
3132 return max(user_lease_time, lease_time) * HZ;
3136 * Since the lifetime of a delegation isn't limited to that of an open, a
3137 * client may quite reasonably hang on to a delegation as long as it has
3138 * the inode cached. This becomes an obvious problem the first time a
3139 * client's inode cache approaches the size of the server's total memory.
3141 * For now we avoid this problem by imposing a hard limit on the number
3142 * of delegations, which varies according to the server's memory size.
3145 set_max_delegations(void)
3148 * Allow at most 4 delegations per megabyte of RAM. Quick
3149 * estimates suggest that in the worst case (where every delegation
3150 * is for a different inode), a delegation could take about 1.5K,
3151 * giving a worst case usage of about 6% of memory.
3153 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
3156 /* initialization to perform when the nfsd service is started: */
3159 __nfs4_state_start(void)
3161 unsigned long grace_time;
3163 boot_time = get_seconds();
3164 grace_time = get_nfs_grace_period();
3165 lease_time = user_lease_time;
3167 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
3169 laundry_wq = create_singlethread_workqueue("nfsd4");
3170 queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
3171 set_max_delegations();
3175 nfs4_state_start(void)
3179 nfsd4_load_reboot_recovery_data();
3180 __nfs4_state_start();
3192 nfs4_lease_time(void)
3198 __nfs4_state_shutdown(void)
3201 struct nfs4_client *clp = NULL;
3202 struct nfs4_delegation *dp = NULL;
3203 struct list_head *pos, *next, reaplist;
3205 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3206 while (!list_empty(&conf_id_hashtbl[i])) {
3207 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
3210 while (!list_empty(&unconf_str_hashtbl[i])) {
3211 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
3215 INIT_LIST_HEAD(&reaplist);
3216 spin_lock(&recall_lock);
3217 list_for_each_safe(pos, next, &del_recall_lru) {
3218 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3219 list_move(&dp->dl_recall_lru, &reaplist);
3221 spin_unlock(&recall_lock);
3222 list_for_each_safe(pos, next, &reaplist) {
3223 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
3224 list_del_init(&dp->dl_recall_lru);
3225 unhash_delegation(dp);
3228 nfsd4_shutdown_recdir();
3233 nfs4_state_shutdown(void)
3235 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
3236 destroy_workqueue(laundry_wq);
3238 nfs4_release_reclaim();
3239 __nfs4_state_shutdown();
3240 nfs4_unlock_state();
3244 nfs4_set_recdir(char *recdir)
3247 strcpy(user_recovery_dirname, recdir);
3248 nfs4_unlock_state();
3252 * Change the NFSv4 recovery directory to recdir.
3255 nfs4_reset_recoverydir(char *recdir)
3258 struct nameidata nd;
3260 status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
3264 if (S_ISDIR(nd.dentry->d_inode->i_mode)) {
3265 nfs4_set_recdir(recdir);
3273 * Called when leasetime is changed.
3275 * The only way the protocol gives us to handle on-the-fly lease changes is to
3276 * simulate a reboot. Instead of doing that, we just wait till the next time
3277 * we start to register any changes in lease time. If the administrator
3278 * really wants to change the lease time *now*, they can go ahead and bring
3279 * nfsd down and then back up again after changing the lease time.
3282 nfs4_reset_lease(time_t leasetime)
3285 user_lease_time = leasetime;