2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
36 #include <linux/smp_lock.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/sunrpc/svcauth_gss.h>
41 #include <linux/sunrpc/clnt.h>
45 #define NFSDDBG_FACILITY NFSDDBG_PROC
48 time_t nfsd4_lease = 90; /* default lease time */
49 time_t nfsd4_grace = 90;
50 static time_t boot_time;
51 static u32 current_ownerid = 1;
52 static u32 current_fileid = 1;
53 static u32 current_delegid = 1;
55 static stateid_t zerostateid; /* bits all 0 */
56 static stateid_t onestateid; /* bits all 1 */
57 static u64 current_sessionid = 1;
59 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
60 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
62 /* forward declarations */
63 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
64 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
65 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
66 static void nfs4_set_recdir(char *recdir);
70 /* Currently used for almost all code touching nfsv4 state: */
71 static DEFINE_MUTEX(client_mutex);
74 * Currently used for the del_recall_lru and file hash table. In an
75 * effort to decrease the scope of the client_mutex, this spinlock may
76 * eventually cover more:
78 static DEFINE_SPINLOCK(recall_lock);
80 static struct kmem_cache *stateowner_slab = NULL;
81 static struct kmem_cache *file_slab = NULL;
82 static struct kmem_cache *stateid_slab = NULL;
83 static struct kmem_cache *deleg_slab = NULL;
88 mutex_lock(&client_mutex);
92 nfs4_unlock_state(void)
94 mutex_unlock(&client_mutex);
98 opaque_hashval(const void *ptr, int nbytes)
100 unsigned char *cptr = (unsigned char *) ptr;
110 static struct list_head del_recall_lru;
113 put_nfs4_file(struct nfs4_file *fi)
115 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
116 list_del(&fi->fi_hash);
117 spin_unlock(&recall_lock);
119 kmem_cache_free(file_slab, fi);
124 get_nfs4_file(struct nfs4_file *fi)
126 atomic_inc(&fi->fi_ref);
129 static int num_delegations;
130 unsigned int max_delegations;
133 * Open owner state (share locks)
136 /* hash tables for nfs4_stateowner */
137 #define OWNER_HASH_BITS 8
138 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
139 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
141 #define ownerid_hashval(id) \
142 ((id) & OWNER_HASH_MASK)
143 #define ownerstr_hashval(clientid, ownername) \
144 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
146 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
147 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
149 /* hash table for nfs4_file */
150 #define FILE_HASH_BITS 8
151 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
152 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
153 /* hash table for (open)nfs4_stateid */
154 #define STATEID_HASH_BITS 10
155 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
156 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
158 #define file_hashval(x) \
159 hash_ptr(x, FILE_HASH_BITS)
160 #define stateid_hashval(owner_id, file_id) \
161 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
163 static struct list_head file_hashtbl[FILE_HASH_SIZE];
164 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
166 static struct nfs4_delegation *
167 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
169 struct nfs4_delegation *dp;
170 struct nfs4_file *fp = stp->st_file;
171 struct nfs4_cb_conn *cb = &stp->st_stateowner->so_client->cl_cb_conn;
173 dprintk("NFSD alloc_init_deleg\n");
174 if (fp->fi_had_conflict)
176 if (num_delegations > max_delegations)
178 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
182 INIT_LIST_HEAD(&dp->dl_perfile);
183 INIT_LIST_HEAD(&dp->dl_perclnt);
184 INIT_LIST_HEAD(&dp->dl_recall_lru);
189 get_file(stp->st_vfs_file);
190 dp->dl_vfs_file = stp->st_vfs_file;
192 dp->dl_ident = cb->cb_ident;
193 dp->dl_stateid.si_boot = get_seconds();
194 dp->dl_stateid.si_stateownerid = current_delegid++;
195 dp->dl_stateid.si_fileid = 0;
196 dp->dl_stateid.si_generation = 0;
197 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
199 atomic_set(&dp->dl_count, 1);
200 list_add(&dp->dl_perfile, &fp->fi_delegations);
201 list_add(&dp->dl_perclnt, &clp->cl_delegations);
202 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
207 nfs4_put_delegation(struct nfs4_delegation *dp)
209 if (atomic_dec_and_test(&dp->dl_count)) {
210 dprintk("NFSD: freeing dp %p\n",dp);
211 put_nfs4_file(dp->dl_file);
212 kmem_cache_free(deleg_slab, dp);
217 /* Remove the associated file_lock first, then remove the delegation.
218 * lease_modify() is called to remove the FS_LEASE file_lock from
219 * the i_flock list, eventually calling nfsd's lock_manager
220 * fl_release_callback.
223 nfs4_close_delegation(struct nfs4_delegation *dp)
225 struct file *filp = dp->dl_vfs_file;
227 dprintk("NFSD: close_delegation dp %p\n",dp);
228 dp->dl_vfs_file = NULL;
229 /* The following nfsd_close may not actually close the file,
230 * but we want to remove the lease in any case. */
232 vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
236 /* Called under the state lock. */
238 unhash_delegation(struct nfs4_delegation *dp)
240 list_del_init(&dp->dl_perfile);
241 list_del_init(&dp->dl_perclnt);
242 spin_lock(&recall_lock);
243 list_del_init(&dp->dl_recall_lru);
244 spin_unlock(&recall_lock);
245 nfs4_close_delegation(dp);
246 nfs4_put_delegation(dp);
253 /* client_lock protects the client lru list and session hash table */
254 static DEFINE_SPINLOCK(client_lock);
256 /* Hash tables for nfs4_clientid state */
257 #define CLIENT_HASH_BITS 4
258 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
259 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
261 #define clientid_hashval(id) \
262 ((id) & CLIENT_HASH_MASK)
263 #define clientstr_hashval(name) \
264 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
266 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
267 * used in reboot/reset lease grace period processing
269 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
270 * setclientid_confirmed info.
272 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
275 * client_lru holds client queue ordered by nfs4_client.cl_time
278 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
279 * for last close replay.
281 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
282 static int reclaim_str_hashtbl_size = 0;
283 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
284 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
285 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
286 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
287 static struct list_head client_lru;
288 static struct list_head close_lru;
290 static void unhash_generic_stateid(struct nfs4_stateid *stp)
292 list_del(&stp->st_hash);
293 list_del(&stp->st_perfile);
294 list_del(&stp->st_perstateowner);
297 static void free_generic_stateid(struct nfs4_stateid *stp)
299 put_nfs4_file(stp->st_file);
300 kmem_cache_free(stateid_slab, stp);
303 static void release_lock_stateid(struct nfs4_stateid *stp)
305 unhash_generic_stateid(stp);
306 locks_remove_posix(stp->st_vfs_file, (fl_owner_t)stp->st_stateowner);
307 free_generic_stateid(stp);
310 static void unhash_lockowner(struct nfs4_stateowner *sop)
312 struct nfs4_stateid *stp;
314 list_del(&sop->so_idhash);
315 list_del(&sop->so_strhash);
316 list_del(&sop->so_perstateid);
317 while (!list_empty(&sop->so_stateids)) {
318 stp = list_first_entry(&sop->so_stateids,
319 struct nfs4_stateid, st_perstateowner);
320 release_lock_stateid(stp);
324 static void release_lockowner(struct nfs4_stateowner *sop)
326 unhash_lockowner(sop);
327 nfs4_put_stateowner(sop);
331 release_stateid_lockowners(struct nfs4_stateid *open_stp)
333 struct nfs4_stateowner *lock_sop;
335 while (!list_empty(&open_stp->st_lockowners)) {
336 lock_sop = list_entry(open_stp->st_lockowners.next,
337 struct nfs4_stateowner, so_perstateid);
338 /* list_del(&open_stp->st_lockowners); */
339 BUG_ON(lock_sop->so_is_open_owner);
340 release_lockowner(lock_sop);
344 static void release_open_stateid(struct nfs4_stateid *stp)
346 unhash_generic_stateid(stp);
347 release_stateid_lockowners(stp);
348 nfsd_close(stp->st_vfs_file);
349 free_generic_stateid(stp);
352 static void unhash_openowner(struct nfs4_stateowner *sop)
354 struct nfs4_stateid *stp;
356 list_del(&sop->so_idhash);
357 list_del(&sop->so_strhash);
358 list_del(&sop->so_perclient);
359 list_del(&sop->so_perstateid); /* XXX: necessary? */
360 while (!list_empty(&sop->so_stateids)) {
361 stp = list_first_entry(&sop->so_stateids,
362 struct nfs4_stateid, st_perstateowner);
363 release_open_stateid(stp);
367 static void release_openowner(struct nfs4_stateowner *sop)
369 unhash_openowner(sop);
370 list_del(&sop->so_close_lru);
371 nfs4_put_stateowner(sop);
374 #define SESSION_HASH_SIZE 512
375 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
378 hash_sessionid(struct nfs4_sessionid *sessionid)
380 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
382 return sid->sequence % SESSION_HASH_SIZE;
386 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
388 u32 *ptr = (u32 *)(&sessionid->data[0]);
389 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
393 gen_sessionid(struct nfsd4_session *ses)
395 struct nfs4_client *clp = ses->se_client;
396 struct nfsd4_sessionid *sid;
398 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
399 sid->clientid = clp->cl_clientid;
400 sid->sequence = current_sessionid++;
405 * The protocol defines ca_maxresponssize_cached to include the size of
406 * the rpc header, but all we need to cache is the data starting after
407 * the end of the initial SEQUENCE operation--the rest we regenerate
408 * each time. Therefore we can advertise a ca_maxresponssize_cached
409 * value that is the number of bytes in our cache plus a few additional
410 * bytes. In order to stay on the safe side, and not promise more than
411 * we can cache, those additional bytes must be the minimum possible: 24
412 * bytes of rpc header (xid through accept state, with AUTH_NULL
413 * verifier), 12 for the compound header (with zero-length tag), and 44
414 * for the SEQUENCE op response:
416 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
419 * Give the client the number of ca_maxresponsesize_cached slots it
420 * requests, of size bounded by NFSD_SLOT_CACHE_SIZE,
421 * NFSD_MAX_MEM_PER_SESSION, and nfsd_drc_max_mem. Do not allow more
422 * than NFSD_MAX_SLOTS_PER_SESSION.
424 * If we run out of reserved DRC memory we should (up to a point)
425 * re-negotiate active sessions and reduce their slot usage to make
426 * rooom for new connections. For now we just fail the create session.
428 static int set_forechannel_drc_size(struct nfsd4_channel_attrs *fchan)
430 int mem, size = fchan->maxresp_cached;
432 if (fchan->maxreqs < 1)
435 if (size < NFSD_MIN_HDR_SEQ_SZ)
436 size = NFSD_MIN_HDR_SEQ_SZ;
437 size -= NFSD_MIN_HDR_SEQ_SZ;
438 if (size > NFSD_SLOT_CACHE_SIZE)
439 size = NFSD_SLOT_CACHE_SIZE;
441 /* bound the maxreqs by NFSD_MAX_MEM_PER_SESSION */
442 mem = fchan->maxreqs * size;
443 if (mem > NFSD_MAX_MEM_PER_SESSION) {
444 fchan->maxreqs = NFSD_MAX_MEM_PER_SESSION / size;
445 if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
446 fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
447 mem = fchan->maxreqs * size;
450 spin_lock(&nfsd_drc_lock);
451 /* bound the total session drc memory ussage */
452 if (mem + nfsd_drc_mem_used > nfsd_drc_max_mem) {
453 fchan->maxreqs = (nfsd_drc_max_mem - nfsd_drc_mem_used) / size;
454 mem = fchan->maxreqs * size;
456 nfsd_drc_mem_used += mem;
457 spin_unlock(&nfsd_drc_lock);
459 if (fchan->maxreqs == 0)
460 return nfserr_serverfault;
462 fchan->maxresp_cached = size + NFSD_MIN_HDR_SEQ_SZ;
467 * fchan holds the client values on input, and the server values on output
468 * sv_max_mesg is the maximum payload plus one page for overhead.
470 static int init_forechannel_attrs(struct svc_rqst *rqstp,
471 struct nfsd4_channel_attrs *session_fchan,
472 struct nfsd4_channel_attrs *fchan)
475 __u32 maxcount = nfsd_serv->sv_max_mesg;
477 /* headerpadsz set to zero in encode routine */
479 /* Use the client's max request and max response size if possible */
480 if (fchan->maxreq_sz > maxcount)
481 fchan->maxreq_sz = maxcount;
482 session_fchan->maxreq_sz = fchan->maxreq_sz;
484 if (fchan->maxresp_sz > maxcount)
485 fchan->maxresp_sz = maxcount;
486 session_fchan->maxresp_sz = fchan->maxresp_sz;
488 /* Use the client's maxops if possible */
489 if (fchan->maxops > NFSD_MAX_OPS_PER_COMPOUND)
490 fchan->maxops = NFSD_MAX_OPS_PER_COMPOUND;
491 session_fchan->maxops = fchan->maxops;
493 /* FIXME: Error means no more DRC pages so the server should
494 * recover pages from existing sessions. For now fail session
497 status = set_forechannel_drc_size(fchan);
499 session_fchan->maxresp_cached = fchan->maxresp_cached;
500 session_fchan->maxreqs = fchan->maxreqs;
502 dprintk("%s status %d\n", __func__, status);
507 free_session_slots(struct nfsd4_session *ses)
511 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
512 kfree(ses->se_slots[i]);
516 * We don't actually need to cache the rpc and session headers, so we
517 * can allocate a little less for each slot:
519 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
521 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
525 alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp,
526 struct nfsd4_create_session *cses)
528 struct nfsd4_session *new, tmp;
529 struct nfsd4_slot *sp;
530 int idx, slotsize, cachesize, i;
533 memset(&tmp, 0, sizeof(tmp));
535 /* FIXME: For now, we just accept the client back channel attributes. */
536 tmp.se_bchannel = cses->back_channel;
537 status = init_forechannel_attrs(rqstp, &tmp.se_fchannel,
538 &cses->fore_channel);
542 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot)
543 + sizeof(struct nfsd4_session) > PAGE_SIZE);
545 status = nfserr_serverfault;
546 /* allocate struct nfsd4_session and slot table pointers in one piece */
547 slotsize = tmp.se_fchannel.maxreqs * sizeof(struct nfsd4_slot *);
548 new = kzalloc(sizeof(*new) + slotsize, GFP_KERNEL);
552 memcpy(new, &tmp, sizeof(*new));
554 /* allocate each struct nfsd4_slot and data cache in one piece */
555 cachesize = slot_bytes(&new->se_fchannel);
556 for (i = 0; i < new->se_fchannel.maxreqs; i++) {
557 sp = kzalloc(sizeof(*sp) + cachesize, GFP_KERNEL);
560 new->se_slots[i] = sp;
563 new->se_client = clp;
565 idx = hash_sessionid(&new->se_sessionid);
566 memcpy(clp->cl_sessionid.data, new->se_sessionid.data,
567 NFS4_MAX_SESSIONID_LEN);
569 new->se_flags = cses->flags;
570 kref_init(&new->se_ref);
571 spin_lock(&client_lock);
572 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
573 list_add(&new->se_perclnt, &clp->cl_sessions);
574 spin_unlock(&client_lock);
580 free_session_slots(new);
585 /* caller must hold client_lock */
586 static struct nfsd4_session *
587 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
589 struct nfsd4_session *elem;
592 dump_sessionid(__func__, sessionid);
593 idx = hash_sessionid(sessionid);
594 dprintk("%s: idx is %d\n", __func__, idx);
595 /* Search in the appropriate list */
596 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
597 dump_sessionid("list traversal", &elem->se_sessionid);
598 if (!memcmp(elem->se_sessionid.data, sessionid->data,
599 NFS4_MAX_SESSIONID_LEN)) {
604 dprintk("%s: session not found\n", __func__);
608 /* caller must hold client_lock */
610 unhash_session(struct nfsd4_session *ses)
612 list_del(&ses->se_hash);
613 list_del(&ses->se_perclnt);
617 free_session(struct kref *kref)
619 struct nfsd4_session *ses;
622 ses = container_of(kref, struct nfsd4_session, se_ref);
623 spin_lock(&nfsd_drc_lock);
624 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
625 nfsd_drc_mem_used -= mem;
626 spin_unlock(&nfsd_drc_lock);
627 free_session_slots(ses);
631 /* must be called under the client_lock */
633 renew_client_locked(struct nfs4_client *clp)
635 if (is_client_expired(clp)) {
636 dprintk("%s: client (clientid %08x/%08x) already expired\n",
638 clp->cl_clientid.cl_boot,
639 clp->cl_clientid.cl_id);
644 * Move client to the end to the LRU list.
646 dprintk("renewing client (clientid %08x/%08x)\n",
647 clp->cl_clientid.cl_boot,
648 clp->cl_clientid.cl_id);
649 list_move_tail(&clp->cl_lru, &client_lru);
650 clp->cl_time = get_seconds();
654 renew_client(struct nfs4_client *clp)
656 spin_lock(&client_lock);
657 renew_client_locked(clp);
658 spin_unlock(&client_lock);
661 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
663 STALE_CLIENTID(clientid_t *clid)
665 if (clid->cl_boot == boot_time)
667 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
668 clid->cl_boot, clid->cl_id, boot_time);
673 * XXX Should we use a slab cache ?
674 * This type of memory management is somewhat inefficient, but we use it
675 * anyway since SETCLIENTID is not a common operation.
677 static struct nfs4_client *alloc_client(struct xdr_netobj name)
679 struct nfs4_client *clp;
681 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
684 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
685 if (clp->cl_name.data == NULL) {
689 memcpy(clp->cl_name.data, name.data, name.len);
690 clp->cl_name.len = name.len;
695 free_client(struct nfs4_client *clp)
697 if (clp->cl_cred.cr_group_info)
698 put_group_info(clp->cl_cred.cr_group_info);
699 kfree(clp->cl_principal);
700 kfree(clp->cl_name.data);
705 release_session_client(struct nfsd4_session *session)
707 struct nfs4_client *clp = session->se_client;
709 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
711 if (is_client_expired(clp)) {
713 session->se_client = NULL;
715 renew_client_locked(clp);
716 spin_unlock(&client_lock);
717 nfsd4_put_session(session);
720 /* must be called under the client_lock */
722 unhash_client_locked(struct nfs4_client *clp)
724 mark_client_expired(clp);
725 list_del(&clp->cl_lru);
726 while (!list_empty(&clp->cl_sessions)) {
727 struct nfsd4_session *ses;
728 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
731 nfsd4_put_session(ses);
736 expire_client(struct nfs4_client *clp)
738 struct nfs4_stateowner *sop;
739 struct nfs4_delegation *dp;
740 struct list_head reaplist;
742 INIT_LIST_HEAD(&reaplist);
743 spin_lock(&recall_lock);
744 while (!list_empty(&clp->cl_delegations)) {
745 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
746 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
748 list_del_init(&dp->dl_perclnt);
749 list_move(&dp->dl_recall_lru, &reaplist);
751 spin_unlock(&recall_lock);
752 while (!list_empty(&reaplist)) {
753 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
754 list_del_init(&dp->dl_recall_lru);
755 unhash_delegation(dp);
757 while (!list_empty(&clp->cl_openowners)) {
758 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
759 release_openowner(sop);
761 nfsd4_set_callback_client(clp, NULL);
762 if (clp->cl_cb_conn.cb_xprt)
763 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
764 list_del(&clp->cl_idhash);
765 list_del(&clp->cl_strhash);
766 spin_lock(&client_lock);
767 unhash_client_locked(clp);
768 if (atomic_read(&clp->cl_refcount) == 0)
770 spin_unlock(&client_lock);
773 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
775 memcpy(target->cl_verifier.data, source->data,
776 sizeof(target->cl_verifier.data));
779 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
781 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
782 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
785 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
787 target->cr_uid = source->cr_uid;
788 target->cr_gid = source->cr_gid;
789 target->cr_group_info = source->cr_group_info;
790 get_group_info(target->cr_group_info);
793 static int same_name(const char *n1, const char *n2)
795 return 0 == memcmp(n1, n2, HEXDIR_LEN);
799 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
801 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
805 same_clid(clientid_t *cl1, clientid_t *cl2)
807 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
810 /* XXX what about NGROUP */
812 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
814 return cr1->cr_uid == cr2->cr_uid;
817 static void gen_clid(struct nfs4_client *clp)
819 static u32 current_clientid = 1;
821 clp->cl_clientid.cl_boot = boot_time;
822 clp->cl_clientid.cl_id = current_clientid++;
825 static void gen_confirm(struct nfs4_client *clp)
830 p = (u32 *)clp->cl_confirm.data;
831 *p++ = get_seconds();
835 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
836 struct svc_rqst *rqstp, nfs4_verifier *verf)
838 struct nfs4_client *clp;
839 struct sockaddr *sa = svc_addr(rqstp);
842 clp = alloc_client(name);
846 princ = svc_gss_principal(rqstp);
848 clp->cl_principal = kstrdup(princ, GFP_KERNEL);
849 if (clp->cl_principal == NULL) {
855 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
856 atomic_set(&clp->cl_refcount, 0);
857 atomic_set(&clp->cl_cb_set, 0);
858 INIT_LIST_HEAD(&clp->cl_idhash);
859 INIT_LIST_HEAD(&clp->cl_strhash);
860 INIT_LIST_HEAD(&clp->cl_openowners);
861 INIT_LIST_HEAD(&clp->cl_delegations);
862 INIT_LIST_HEAD(&clp->cl_sessions);
863 INIT_LIST_HEAD(&clp->cl_lru);
864 clp->cl_time = get_seconds();
865 clear_bit(0, &clp->cl_cb_slot_busy);
866 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
867 copy_verf(clp, verf);
868 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
869 clp->cl_flavor = rqstp->rq_flavor;
870 copy_cred(&clp->cl_cred, &rqstp->rq_cred);
876 static int check_name(struct xdr_netobj name)
880 if (name.len > NFS4_OPAQUE_LIMIT) {
881 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
888 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
890 unsigned int idhashval;
892 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
893 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
894 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
899 move_to_confirmed(struct nfs4_client *clp)
901 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
902 unsigned int strhashval;
904 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
905 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
906 strhashval = clientstr_hashval(clp->cl_recdir);
907 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
911 static struct nfs4_client *
912 find_confirmed_client(clientid_t *clid)
914 struct nfs4_client *clp;
915 unsigned int idhashval = clientid_hashval(clid->cl_id);
917 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
918 if (same_clid(&clp->cl_clientid, clid))
924 static struct nfs4_client *
925 find_unconfirmed_client(clientid_t *clid)
927 struct nfs4_client *clp;
928 unsigned int idhashval = clientid_hashval(clid->cl_id);
930 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
931 if (same_clid(&clp->cl_clientid, clid))
938 * Return 1 iff clp's clientid establishment method matches the use_exchange_id
939 * parameter. Matching is based on the fact the at least one of the
940 * EXCHGID4_FLAG_USE_{NON_PNFS,PNFS_MDS,PNFS_DS} flags must be set for v4.1
942 * FIXME: we need to unify the clientid namespaces for nfsv4.x
943 * and correctly deal with client upgrade/downgrade in EXCHANGE_ID
944 * and SET_CLIENTID{,_CONFIRM}
947 match_clientid_establishment(struct nfs4_client *clp, bool use_exchange_id)
949 bool has_exchange_flags = (clp->cl_exchange_flags != 0);
950 return use_exchange_id == has_exchange_flags;
953 static struct nfs4_client *
954 find_confirmed_client_by_str(const char *dname, unsigned int hashval,
955 bool use_exchange_id)
957 struct nfs4_client *clp;
959 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
960 if (same_name(clp->cl_recdir, dname) &&
961 match_clientid_establishment(clp, use_exchange_id))
967 static struct nfs4_client *
968 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval,
969 bool use_exchange_id)
971 struct nfs4_client *clp;
973 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
974 if (same_name(clp->cl_recdir, dname) &&
975 match_clientid_establishment(clp, use_exchange_id))
982 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, u32 scopeid)
984 struct nfs4_cb_conn *cb = &clp->cl_cb_conn;
985 unsigned short expected_family;
987 /* Currently, we only support tcp and tcp6 for the callback channel */
988 if (se->se_callback_netid_len == 3 &&
989 !memcmp(se->se_callback_netid_val, "tcp", 3))
990 expected_family = AF_INET;
991 else if (se->se_callback_netid_len == 4 &&
992 !memcmp(se->se_callback_netid_val, "tcp6", 4))
993 expected_family = AF_INET6;
997 cb->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
998 se->se_callback_addr_len,
999 (struct sockaddr *) &cb->cb_addr,
1000 sizeof(cb->cb_addr));
1002 if (!cb->cb_addrlen || cb->cb_addr.ss_family != expected_family)
1005 if (cb->cb_addr.ss_family == AF_INET6)
1006 ((struct sockaddr_in6 *) &cb->cb_addr)->sin6_scope_id = scopeid;
1008 cb->cb_minorversion = 0;
1009 cb->cb_prog = se->se_callback_prog;
1010 cb->cb_ident = se->se_callback_ident;
1013 cb->cb_addr.ss_family = AF_UNSPEC;
1015 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1016 "will not receive delegations\n",
1017 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1023 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1026 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1028 struct nfsd4_slot *slot = resp->cstate.slot;
1031 dprintk("--> %s slot %p\n", __func__, slot);
1033 slot->sl_opcnt = resp->opcnt;
1034 slot->sl_status = resp->cstate.status;
1036 if (nfsd4_not_cached(resp)) {
1037 slot->sl_datalen = 0;
1040 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1041 base = (char *)resp->cstate.datap -
1042 (char *)resp->xbuf->head[0].iov_base;
1043 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1045 WARN("%s: sessions DRC could not cache compound\n", __func__);
1050 * Encode the replay sequence operation from the slot values.
1051 * If cachethis is FALSE encode the uncached rep error on the next
1052 * operation which sets resp->p and increments resp->opcnt for
1053 * nfs4svc_encode_compoundres.
1057 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1058 struct nfsd4_compoundres *resp)
1060 struct nfsd4_op *op;
1061 struct nfsd4_slot *slot = resp->cstate.slot;
1063 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
1064 resp->opcnt, resp->cstate.slot->sl_cachethis);
1066 /* Encode the replayed sequence operation */
1067 op = &args->ops[resp->opcnt - 1];
1068 nfsd4_encode_operation(resp, op);
1070 /* Return nfserr_retry_uncached_rep in next operation. */
1071 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
1072 op = &args->ops[resp->opcnt++];
1073 op->status = nfserr_retry_uncached_rep;
1074 nfsd4_encode_operation(resp, op);
1080 * The sequence operation is not cached because we can use the slot and
1084 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1085 struct nfsd4_sequence *seq)
1087 struct nfsd4_slot *slot = resp->cstate.slot;
1090 dprintk("--> %s slot %p\n", __func__, slot);
1092 /* Either returns 0 or nfserr_retry_uncached */
1093 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1094 if (status == nfserr_retry_uncached_rep)
1097 /* The sequence operation has been encoded, cstate->datap set. */
1098 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1100 resp->opcnt = slot->sl_opcnt;
1101 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1102 status = slot->sl_status;
1108 * Set the exchange_id flags returned by the server.
1111 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1113 /* pNFS is not supported */
1114 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1116 /* Referrals are supported, Migration is not. */
1117 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1119 /* set the wire flags to return to client. */
1120 clid->flags = new->cl_exchange_flags;
1124 nfsd4_exchange_id(struct svc_rqst *rqstp,
1125 struct nfsd4_compound_state *cstate,
1126 struct nfsd4_exchange_id *exid)
1128 struct nfs4_client *unconf, *conf, *new;
1130 unsigned int strhashval;
1131 char dname[HEXDIR_LEN];
1132 char addr_str[INET6_ADDRSTRLEN];
1133 nfs4_verifier verf = exid->verifier;
1134 struct sockaddr *sa = svc_addr(rqstp);
1136 rpc_ntop(sa, addr_str, sizeof(addr_str));
1137 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1138 "ip_addr=%s flags %x, spa_how %d\n",
1139 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1140 addr_str, exid->flags, exid->spa_how);
1142 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1143 return nfserr_inval;
1145 /* Currently only support SP4_NONE */
1146 switch (exid->spa_how) {
1150 return nfserr_encr_alg_unsupp;
1152 BUG(); /* checked by xdr code */
1154 return nfserr_serverfault; /* no excuse :-/ */
1157 status = nfs4_make_rec_clidname(dname, &exid->clname);
1162 strhashval = clientstr_hashval(dname);
1167 conf = find_confirmed_client_by_str(dname, strhashval, true);
1169 if (!same_verf(&verf, &conf->cl_verifier)) {
1170 /* 18.35.4 case 8 */
1171 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1172 status = nfserr_not_same;
1175 /* Client reboot: destroy old state */
1176 expire_client(conf);
1179 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1180 /* 18.35.4 case 9 */
1181 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1182 status = nfserr_perm;
1185 expire_client(conf);
1189 * Set bit when the owner id and verifier map to an already
1190 * confirmed client id (18.35.3).
1192 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1195 * Falling into 18.35.4 case 2, possible router replay.
1196 * Leave confirmed record intact and return same result.
1198 copy_verf(conf, &verf);
1203 /* 18.35.4 case 7 */
1204 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1205 status = nfserr_noent;
1209 unconf = find_unconfirmed_client_by_str(dname, strhashval, true);
1212 * Possible retry or client restart. Per 18.35.4 case 4,
1213 * a new unconfirmed record should be generated regardless
1214 * of whether any properties have changed.
1216 expire_client(unconf);
1221 new = create_client(exid->clname, dname, rqstp, &verf);
1223 status = nfserr_serverfault;
1228 add_to_unconfirmed(new, strhashval);
1230 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1231 exid->clientid.cl_id = new->cl_clientid.cl_id;
1234 nfsd4_set_ex_flags(new, exid);
1236 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1237 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1241 nfs4_unlock_state();
1243 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1248 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1250 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1253 /* The slot is in use, and no response has been sent. */
1255 if (seqid == slot_seqid)
1256 return nfserr_jukebox;
1258 return nfserr_seq_misordered;
1261 if (likely(seqid == slot_seqid + 1))
1264 if (seqid == slot_seqid)
1265 return nfserr_replay_cache;
1267 if (seqid == 1 && (slot_seqid + 1) == 0)
1269 /* Misordered replay or misordered new request */
1270 return nfserr_seq_misordered;
1274 * Cache the create session result into the create session single DRC
1275 * slot cache by saving the xdr structure. sl_seqid has been set.
1276 * Do this for solo or embedded create session operations.
1279 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1280 struct nfsd4_clid_slot *slot, int nfserr)
1282 slot->sl_status = nfserr;
1283 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1287 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1288 struct nfsd4_clid_slot *slot)
1290 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1291 return slot->sl_status;
1295 nfsd4_create_session(struct svc_rqst *rqstp,
1296 struct nfsd4_compound_state *cstate,
1297 struct nfsd4_create_session *cr_ses)
1299 struct sockaddr *sa = svc_addr(rqstp);
1300 struct nfs4_client *conf, *unconf;
1301 struct nfsd4_clid_slot *cs_slot = NULL;
1305 unconf = find_unconfirmed_client(&cr_ses->clientid);
1306 conf = find_confirmed_client(&cr_ses->clientid);
1309 cs_slot = &conf->cl_cs_slot;
1310 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1311 if (status == nfserr_replay_cache) {
1312 dprintk("Got a create_session replay! seqid= %d\n",
1314 /* Return the cached reply status */
1315 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1317 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1318 status = nfserr_seq_misordered;
1319 dprintk("Sequence misordered!\n");
1320 dprintk("Expected seqid= %d but got seqid= %d\n",
1321 cs_slot->sl_seqid, cr_ses->seqid);
1324 cs_slot->sl_seqid++;
1325 } else if (unconf) {
1326 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1327 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1328 status = nfserr_clid_inuse;
1332 cs_slot = &unconf->cl_cs_slot;
1333 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1335 /* an unconfirmed replay returns misordered */
1336 status = nfserr_seq_misordered;
1340 cs_slot->sl_seqid++; /* from 0 to 1 */
1341 move_to_confirmed(unconf);
1343 if (cr_ses->flags & SESSION4_BACK_CHAN) {
1344 unconf->cl_cb_conn.cb_xprt = rqstp->rq_xprt;
1345 svc_xprt_get(rqstp->rq_xprt);
1347 (struct sockaddr *)&unconf->cl_cb_conn.cb_addr,
1349 unconf->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1350 unconf->cl_cb_conn.cb_minorversion =
1351 cstate->minorversion;
1352 unconf->cl_cb_conn.cb_prog = cr_ses->callback_prog;
1353 unconf->cl_cb_seq_nr = 1;
1354 nfsd4_probe_callback(unconf, &unconf->cl_cb_conn);
1358 status = nfserr_stale_clientid;
1363 * We do not support RDMA or persistent sessions
1365 cr_ses->flags &= ~SESSION4_PERSIST;
1366 cr_ses->flags &= ~SESSION4_RDMA;
1368 status = alloc_init_session(rqstp, conf, cr_ses);
1372 memcpy(cr_ses->sessionid.data, conf->cl_sessionid.data,
1373 NFS4_MAX_SESSIONID_LEN);
1374 cr_ses->seqid = cs_slot->sl_seqid;
1377 /* cache solo and embedded create sessions under the state lock */
1378 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1380 nfs4_unlock_state();
1381 dprintk("%s returns %d\n", __func__, ntohl(status));
1385 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1387 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1388 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1390 return argp->opcnt == resp->opcnt;
1393 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1397 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1401 nfsd4_destroy_session(struct svc_rqst *r,
1402 struct nfsd4_compound_state *cstate,
1403 struct nfsd4_destroy_session *sessionid)
1405 struct nfsd4_session *ses;
1406 u32 status = nfserr_badsession;
1409 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1410 * - Should we return nfserr_back_chan_busy if waiting for
1411 * callbacks on to-be-destroyed session?
1412 * - Do we need to clear any callback info from previous session?
1415 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1416 if (!nfsd4_last_compound_op(r))
1417 return nfserr_not_only_op;
1419 dump_sessionid(__func__, &sessionid->sessionid);
1420 spin_lock(&client_lock);
1421 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1423 spin_unlock(&client_lock);
1427 unhash_session(ses);
1428 spin_unlock(&client_lock);
1430 /* wait for callbacks */
1431 nfsd4_set_callback_client(ses->se_client, NULL);
1432 nfsd4_put_session(ses);
1435 dprintk("%s returns %d\n", __func__, ntohl(status));
1440 nfsd4_sequence(struct svc_rqst *rqstp,
1441 struct nfsd4_compound_state *cstate,
1442 struct nfsd4_sequence *seq)
1444 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1445 struct nfsd4_session *session;
1446 struct nfsd4_slot *slot;
1449 if (resp->opcnt != 1)
1450 return nfserr_sequence_pos;
1452 spin_lock(&client_lock);
1453 status = nfserr_badsession;
1454 session = find_in_sessionid_hashtbl(&seq->sessionid);
1458 status = nfserr_badslot;
1459 if (seq->slotid >= session->se_fchannel.maxreqs)
1462 slot = session->se_slots[seq->slotid];
1463 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1465 /* We do not negotiate the number of slots yet, so set the
1466 * maxslots to the session maxreqs which is used to encode
1467 * sr_highest_slotid and the sr_target_slot id to maxslots */
1468 seq->maxslots = session->se_fchannel.maxreqs;
1470 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
1471 if (status == nfserr_replay_cache) {
1472 cstate->slot = slot;
1473 cstate->session = session;
1474 /* Return the cached reply status and set cstate->status
1475 * for nfsd4_proc_compound processing */
1476 status = nfsd4_replay_cache_entry(resp, seq);
1477 cstate->status = nfserr_replay_cache;
1483 /* Success! bump slot seqid */
1484 slot->sl_inuse = true;
1485 slot->sl_seqid = seq->seqid;
1486 slot->sl_cachethis = seq->cachethis;
1488 cstate->slot = slot;
1489 cstate->session = session;
1492 /* Hold a session reference until done processing the compound. */
1493 if (cstate->session) {
1494 nfsd4_get_session(cstate->session);
1495 atomic_inc(&session->se_client->cl_refcount);
1497 spin_unlock(&client_lock);
1498 dprintk("%s: return %d\n", __func__, ntohl(status));
1503 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1504 struct nfsd4_setclientid *setclid)
1506 struct sockaddr *sa = svc_addr(rqstp);
1507 struct xdr_netobj clname = {
1508 .len = setclid->se_namelen,
1509 .data = setclid->se_name,
1511 nfs4_verifier clverifier = setclid->se_verf;
1512 unsigned int strhashval;
1513 struct nfs4_client *conf, *unconf, *new;
1515 char dname[HEXDIR_LEN];
1517 if (!check_name(clname))
1518 return nfserr_inval;
1520 status = nfs4_make_rec_clidname(dname, &clname);
1525 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1526 * We get here on a DRC miss.
1529 strhashval = clientstr_hashval(dname);
1532 conf = find_confirmed_client_by_str(dname, strhashval, false);
1534 /* RFC 3530 14.2.33 CASE 0: */
1535 status = nfserr_clid_inuse;
1536 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1537 char addr_str[INET6_ADDRSTRLEN];
1538 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1540 dprintk("NFSD: setclientid: string in use by client "
1541 "at %s\n", addr_str);
1546 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1547 * has a description of SETCLIENTID request processing consisting
1548 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1550 unconf = find_unconfirmed_client_by_str(dname, strhashval, false);
1551 status = nfserr_resource;
1554 * RFC 3530 14.2.33 CASE 4:
1555 * placed first, because it is the normal case
1558 expire_client(unconf);
1559 new = create_client(clname, dname, rqstp, &clverifier);
1563 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1565 * RFC 3530 14.2.33 CASE 1:
1566 * probable callback update
1569 /* Note this is removing unconfirmed {*x***},
1570 * which is stronger than RFC recommended {vxc**}.
1571 * This has the advantage that there is at most
1572 * one {*x***} in either list at any time.
1574 expire_client(unconf);
1576 new = create_client(clname, dname, rqstp, &clverifier);
1579 copy_clid(new, conf);
1580 } else if (!unconf) {
1582 * RFC 3530 14.2.33 CASE 2:
1583 * probable client reboot; state will be removed if
1586 new = create_client(clname, dname, rqstp, &clverifier);
1592 * RFC 3530 14.2.33 CASE 3:
1593 * probable client reboot; state will be removed if
1596 expire_client(unconf);
1597 new = create_client(clname, dname, rqstp, &clverifier);
1602 gen_callback(new, setclid, rpc_get_scope_id(sa));
1603 add_to_unconfirmed(new, strhashval);
1604 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1605 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1606 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1609 nfs4_unlock_state();
1615 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1616 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1617 * bullets, labeled as CASE1 - CASE4 below.
1620 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1621 struct nfsd4_compound_state *cstate,
1622 struct nfsd4_setclientid_confirm *setclientid_confirm)
1624 struct sockaddr *sa = svc_addr(rqstp);
1625 struct nfs4_client *conf, *unconf;
1626 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1627 clientid_t * clid = &setclientid_confirm->sc_clientid;
1630 if (STALE_CLIENTID(clid))
1631 return nfserr_stale_clientid;
1633 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1634 * We get here on a DRC miss.
1639 conf = find_confirmed_client(clid);
1640 unconf = find_unconfirmed_client(clid);
1642 status = nfserr_clid_inuse;
1643 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
1645 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
1649 * section 14.2.34 of RFC 3530 has a description of
1650 * SETCLIENTID_CONFIRM request processing consisting
1651 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1653 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
1655 * RFC 3530 14.2.34 CASE 1:
1658 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1659 status = nfserr_clid_inuse;
1661 atomic_set(&conf->cl_cb_set, 0);
1662 nfsd4_probe_callback(conf, &unconf->cl_cb_conn);
1663 expire_client(unconf);
1667 } else if (conf && !unconf) {
1669 * RFC 3530 14.2.34 CASE 2:
1670 * probable retransmitted request; play it safe and
1673 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1674 status = nfserr_clid_inuse;
1677 } else if (!conf && unconf
1678 && same_verf(&unconf->cl_confirm, &confirm)) {
1680 * RFC 3530 14.2.34 CASE 3:
1681 * Normal case; new or rebooted client:
1683 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1684 status = nfserr_clid_inuse;
1687 clientstr_hashval(unconf->cl_recdir);
1688 conf = find_confirmed_client_by_str(unconf->cl_recdir,
1691 nfsd4_remove_clid_dir(conf);
1692 expire_client(conf);
1694 move_to_confirmed(unconf);
1696 nfsd4_probe_callback(conf, &conf->cl_cb_conn);
1699 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1700 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
1703 * RFC 3530 14.2.34 CASE 4:
1704 * Client probably hasn't noticed that we rebooted yet.
1706 status = nfserr_stale_clientid;
1708 /* check that we have hit one of the cases...*/
1709 status = nfserr_clid_inuse;
1712 nfs4_unlock_state();
1716 /* OPEN Share state helper functions */
1717 static inline struct nfs4_file *
1718 alloc_init_file(struct inode *ino)
1720 struct nfs4_file *fp;
1721 unsigned int hashval = file_hashval(ino);
1723 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
1725 atomic_set(&fp->fi_ref, 1);
1726 INIT_LIST_HEAD(&fp->fi_hash);
1727 INIT_LIST_HEAD(&fp->fi_stateids);
1728 INIT_LIST_HEAD(&fp->fi_delegations);
1729 spin_lock(&recall_lock);
1730 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
1731 spin_unlock(&recall_lock);
1732 fp->fi_inode = igrab(ino);
1733 fp->fi_id = current_fileid++;
1734 fp->fi_had_conflict = false;
1741 nfsd4_free_slab(struct kmem_cache **slab)
1745 kmem_cache_destroy(*slab);
1750 nfsd4_free_slabs(void)
1752 nfsd4_free_slab(&stateowner_slab);
1753 nfsd4_free_slab(&file_slab);
1754 nfsd4_free_slab(&stateid_slab);
1755 nfsd4_free_slab(&deleg_slab);
1759 nfsd4_init_slabs(void)
1761 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
1762 sizeof(struct nfs4_stateowner), 0, 0, NULL);
1763 if (stateowner_slab == NULL)
1765 file_slab = kmem_cache_create("nfsd4_files",
1766 sizeof(struct nfs4_file), 0, 0, NULL);
1767 if (file_slab == NULL)
1769 stateid_slab = kmem_cache_create("nfsd4_stateids",
1770 sizeof(struct nfs4_stateid), 0, 0, NULL);
1771 if (stateid_slab == NULL)
1773 deleg_slab = kmem_cache_create("nfsd4_delegations",
1774 sizeof(struct nfs4_delegation), 0, 0, NULL);
1775 if (deleg_slab == NULL)
1780 dprintk("nfsd4: out of memory while initializing nfsv4\n");
1785 nfs4_free_stateowner(struct kref *kref)
1787 struct nfs4_stateowner *sop =
1788 container_of(kref, struct nfs4_stateowner, so_ref);
1789 kfree(sop->so_owner.data);
1790 kmem_cache_free(stateowner_slab, sop);
1793 static inline struct nfs4_stateowner *
1794 alloc_stateowner(struct xdr_netobj *owner)
1796 struct nfs4_stateowner *sop;
1798 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
1799 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
1800 memcpy(sop->so_owner.data, owner->data, owner->len);
1801 sop->so_owner.len = owner->len;
1802 kref_init(&sop->so_ref);
1805 kmem_cache_free(stateowner_slab, sop);
1810 static struct nfs4_stateowner *
1811 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
1812 struct nfs4_stateowner *sop;
1813 struct nfs4_replay *rp;
1814 unsigned int idhashval;
1816 if (!(sop = alloc_stateowner(&open->op_owner)))
1818 idhashval = ownerid_hashval(current_ownerid);
1819 INIT_LIST_HEAD(&sop->so_idhash);
1820 INIT_LIST_HEAD(&sop->so_strhash);
1821 INIT_LIST_HEAD(&sop->so_perclient);
1822 INIT_LIST_HEAD(&sop->so_stateids);
1823 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
1824 INIT_LIST_HEAD(&sop->so_close_lru);
1826 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
1827 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
1828 list_add(&sop->so_perclient, &clp->cl_openowners);
1829 sop->so_is_open_owner = 1;
1830 sop->so_id = current_ownerid++;
1831 sop->so_client = clp;
1832 sop->so_seqid = open->op_seqid;
1833 sop->so_confirmed = 0;
1834 rp = &sop->so_replay;
1835 rp->rp_status = nfserr_serverfault;
1837 rp->rp_buf = rp->rp_ibuf;
1842 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
1843 struct nfs4_stateowner *sop = open->op_stateowner;
1844 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
1846 INIT_LIST_HEAD(&stp->st_hash);
1847 INIT_LIST_HEAD(&stp->st_perstateowner);
1848 INIT_LIST_HEAD(&stp->st_lockowners);
1849 INIT_LIST_HEAD(&stp->st_perfile);
1850 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
1851 list_add(&stp->st_perstateowner, &sop->so_stateids);
1852 list_add(&stp->st_perfile, &fp->fi_stateids);
1853 stp->st_stateowner = sop;
1856 stp->st_stateid.si_boot = get_seconds();
1857 stp->st_stateid.si_stateownerid = sop->so_id;
1858 stp->st_stateid.si_fileid = fp->fi_id;
1859 stp->st_stateid.si_generation = 0;
1860 stp->st_access_bmap = 0;
1861 stp->st_deny_bmap = 0;
1862 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
1863 &stp->st_access_bmap);
1864 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
1865 stp->st_openstp = NULL;
1869 move_to_close_lru(struct nfs4_stateowner *sop)
1871 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
1873 list_move_tail(&sop->so_close_lru, &close_lru);
1874 sop->so_time = get_seconds();
1878 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
1881 return (sop->so_owner.len == owner->len) &&
1882 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
1883 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
1886 static struct nfs4_stateowner *
1887 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
1889 struct nfs4_stateowner *so = NULL;
1891 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
1892 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
1898 /* search file_hashtbl[] for file */
1899 static struct nfs4_file *
1900 find_file(struct inode *ino)
1902 unsigned int hashval = file_hashval(ino);
1903 struct nfs4_file *fp;
1905 spin_lock(&recall_lock);
1906 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
1907 if (fp->fi_inode == ino) {
1909 spin_unlock(&recall_lock);
1913 spin_unlock(&recall_lock);
1917 static inline int access_valid(u32 x, u32 minorversion)
1919 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
1921 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
1923 x &= ~NFS4_SHARE_ACCESS_MASK;
1924 if (minorversion && x) {
1925 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
1927 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
1929 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
1936 static inline int deny_valid(u32 x)
1938 /* Note: unlike access bits, deny bits may be zero. */
1939 return x <= NFS4_SHARE_DENY_BOTH;
1943 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1944 * st_{access,deny}_bmap field of the stateid, in order to track not
1945 * only what share bits are currently in force, but also what
1946 * combinations of share bits previous opens have used. This allows us
1947 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1948 * return an error if the client attempt to downgrade to a combination
1949 * of share bits not explicable by closing some of its previous opens.
1951 * XXX: This enforcement is actually incomplete, since we don't keep
1952 * track of access/deny bit combinations; so, e.g., we allow:
1954 * OPEN allow read, deny write
1955 * OPEN allow both, deny none
1956 * DOWNGRADE allow read, deny none
1958 * which we should reject.
1961 set_access(unsigned int *access, unsigned long bmap) {
1965 for (i = 1; i < 4; i++) {
1966 if (test_bit(i, &bmap))
1972 set_deny(unsigned int *deny, unsigned long bmap) {
1976 for (i = 0; i < 4; i++) {
1977 if (test_bit(i, &bmap))
1983 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
1984 unsigned int access, deny;
1986 set_access(&access, stp->st_access_bmap);
1987 set_deny(&deny, stp->st_deny_bmap);
1988 if ((access & open->op_share_deny) || (deny & open->op_share_access))
1994 * Called to check deny when READ with all zero stateid or
1995 * WRITE with all zero or all one stateid
1998 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2000 struct inode *ino = current_fh->fh_dentry->d_inode;
2001 struct nfs4_file *fp;
2002 struct nfs4_stateid *stp;
2005 dprintk("NFSD: nfs4_share_conflict\n");
2007 fp = find_file(ino);
2010 ret = nfserr_locked;
2011 /* Search for conflicting share reservations */
2012 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2013 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2014 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2024 nfs4_file_downgrade(struct file *filp, unsigned int share_access)
2026 if (share_access & NFS4_SHARE_ACCESS_WRITE) {
2027 drop_file_write_access(filp);
2028 spin_lock(&filp->f_lock);
2029 filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
2030 spin_unlock(&filp->f_lock);
2035 * Spawn a thread to perform a recall on the delegation represented
2036 * by the lease (file_lock)
2038 * Called from break_lease() with lock_kernel() held.
2039 * Note: we assume break_lease will only call this *once* for any given
2043 void nfsd_break_deleg_cb(struct file_lock *fl)
2045 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2047 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2051 /* We're assuming the state code never drops its reference
2052 * without first removing the lease. Since we're in this lease
2053 * callback (and since the lease code is serialized by the kernel
2054 * lock) we know the server hasn't removed the lease yet, we know
2055 * it's safe to take a reference: */
2056 atomic_inc(&dp->dl_count);
2058 spin_lock(&recall_lock);
2059 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2060 spin_unlock(&recall_lock);
2062 /* only place dl_time is set. protected by lock_kernel*/
2063 dp->dl_time = get_seconds();
2066 * We don't want the locks code to timeout the lease for us;
2067 * we'll remove it ourself if the delegation isn't returned
2070 fl->fl_break_time = 0;
2072 dp->dl_file->fi_had_conflict = true;
2073 nfsd4_cb_recall(dp);
2077 * The file_lock is being reapd.
2079 * Called by locks_free_lock() with lock_kernel() held.
2082 void nfsd_release_deleg_cb(struct file_lock *fl)
2084 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2086 dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
2088 if (!(fl->fl_flags & FL_LEASE) || !dp)
2090 dp->dl_flock = NULL;
2094 * Set the delegation file_lock back pointer.
2096 * Called from setlease() with lock_kernel() held.
2099 void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
2101 struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
2103 dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
2110 * Called from setlease() with lock_kernel() held
2113 int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
2115 struct nfs4_delegation *onlistd =
2116 (struct nfs4_delegation *)onlist->fl_owner;
2117 struct nfs4_delegation *tryd =
2118 (struct nfs4_delegation *)try->fl_owner;
2120 if (onlist->fl_lmops != try->fl_lmops)
2123 return onlistd->dl_client == tryd->dl_client;
2128 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2131 return lease_modify(onlist, arg);
2136 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2137 .fl_break = nfsd_break_deleg_cb,
2138 .fl_release_private = nfsd_release_deleg_cb,
2139 .fl_copy_lock = nfsd_copy_lock_deleg_cb,
2140 .fl_mylease = nfsd_same_client_deleg_cb,
2141 .fl_change = nfsd_change_deleg_cb,
2146 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2147 struct nfsd4_open *open)
2149 clientid_t *clientid = &open->op_clientid;
2150 struct nfs4_client *clp = NULL;
2151 unsigned int strhashval;
2152 struct nfs4_stateowner *sop = NULL;
2154 if (!check_name(open->op_owner))
2155 return nfserr_inval;
2157 if (STALE_CLIENTID(&open->op_clientid))
2158 return nfserr_stale_clientid;
2160 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2161 sop = find_openstateowner_str(strhashval, open);
2162 open->op_stateowner = sop;
2164 /* Make sure the client's lease hasn't expired. */
2165 clp = find_confirmed_client(clientid);
2167 return nfserr_expired;
2170 /* When sessions are used, skip open sequenceid processing */
2171 if (nfsd4_has_session(cstate))
2173 if (!sop->so_confirmed) {
2174 /* Replace unconfirmed owners without checking for replay. */
2175 clp = sop->so_client;
2176 release_openowner(sop);
2177 open->op_stateowner = NULL;
2180 if (open->op_seqid == sop->so_seqid - 1) {
2181 if (sop->so_replay.rp_buflen)
2182 return nfserr_replay_me;
2183 /* The original OPEN failed so spectacularly
2184 * that we don't even have replay data saved!
2185 * Therefore, we have no choice but to continue
2186 * processing this OPEN; presumably, we'll
2187 * fail again for the same reason.
2189 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2192 if (open->op_seqid != sop->so_seqid)
2193 return nfserr_bad_seqid;
2195 if (open->op_stateowner == NULL) {
2196 sop = alloc_init_open_stateowner(strhashval, clp, open);
2198 return nfserr_resource;
2199 open->op_stateowner = sop;
2201 list_del_init(&sop->so_close_lru);
2202 renew_client(sop->so_client);
2206 static inline __be32
2207 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2209 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2210 return nfserr_openmode;
2215 static struct nfs4_delegation *
2216 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2218 struct nfs4_delegation *dp;
2220 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
2221 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2228 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2229 struct nfs4_delegation **dp)
2232 __be32 status = nfserr_bad_stateid;
2234 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2237 flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
2238 RD_STATE : WR_STATE;
2239 status = nfs4_check_delegmode(*dp, flags);
2243 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2247 open->op_stateowner->so_confirmed = 1;
2252 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2254 struct nfs4_stateid *local;
2255 __be32 status = nfserr_share_denied;
2256 struct nfs4_stateowner *sop = open->op_stateowner;
2258 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2259 /* ignore lock owners */
2260 if (local->st_stateowner->so_is_open_owner == 0)
2262 /* remember if we have seen this open owner */
2263 if (local->st_stateowner == sop)
2265 /* check for conflicting share reservations */
2266 if (!test_share(local, open))
2274 static inline struct nfs4_stateid *
2275 nfs4_alloc_stateid(void)
2277 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2281 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
2282 struct nfs4_delegation *dp,
2283 struct svc_fh *cur_fh, int flags)
2285 struct nfs4_stateid *stp;
2287 stp = nfs4_alloc_stateid();
2289 return nfserr_resource;
2292 get_file(dp->dl_vfs_file);
2293 stp->st_vfs_file = dp->dl_vfs_file;
2296 status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
2299 if (status == nfserr_dropit)
2300 status = nfserr_jukebox;
2301 kmem_cache_free(stateid_slab, stp);
2309 static inline __be32
2310 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2311 struct nfsd4_open *open)
2313 struct iattr iattr = {
2314 .ia_valid = ATTR_SIZE,
2317 if (!open->op_truncate)
2319 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2320 return nfserr_inval;
2321 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2325 nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2327 struct file *filp = stp->st_vfs_file;
2328 struct inode *inode = filp->f_path.dentry->d_inode;
2329 unsigned int share_access, new_writer;
2332 set_access(&share_access, stp->st_access_bmap);
2333 new_writer = (~share_access) & open->op_share_access
2334 & NFS4_SHARE_ACCESS_WRITE;
2337 int err = get_write_access(inode);
2339 return nfserrno(err);
2340 err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
2342 return nfserrno(err);
2343 file_take_write(filp);
2345 status = nfsd4_truncate(rqstp, cur_fh, open);
2348 put_write_access(inode);
2351 /* remember the open */
2352 filp->f_mode |= open->op_share_access;
2353 __set_bit(open->op_share_access, &stp->st_access_bmap);
2354 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2361 nfs4_set_claim_prev(struct nfsd4_open *open)
2363 open->op_stateowner->so_confirmed = 1;
2364 open->op_stateowner->so_client->cl_firststate = 1;
2368 * Attempt to hand out a delegation.
2371 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2373 struct nfs4_delegation *dp;
2374 struct nfs4_stateowner *sop = stp->st_stateowner;
2375 int cb_up = atomic_read(&sop->so_client->cl_cb_set);
2376 struct file_lock fl, *flp = &fl;
2377 int status, flag = 0;
2379 flag = NFS4_OPEN_DELEGATE_NONE;
2380 open->op_recall = 0;
2381 switch (open->op_claim_type) {
2382 case NFS4_OPEN_CLAIM_PREVIOUS:
2384 open->op_recall = 1;
2385 flag = open->op_delegate_type;
2386 if (flag == NFS4_OPEN_DELEGATE_NONE)
2389 case NFS4_OPEN_CLAIM_NULL:
2390 /* Let's not give out any delegations till everyone's
2391 * had the chance to reclaim theirs.... */
2392 if (locks_in_grace())
2394 if (!cb_up || !sop->so_confirmed)
2396 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2397 flag = NFS4_OPEN_DELEGATE_WRITE;
2399 flag = NFS4_OPEN_DELEGATE_READ;
2405 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2407 flag = NFS4_OPEN_DELEGATE_NONE;
2410 locks_init_lock(&fl);
2411 fl.fl_lmops = &nfsd_lease_mng_ops;
2412 fl.fl_flags = FL_LEASE;
2413 fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2414 fl.fl_end = OFFSET_MAX;
2415 fl.fl_owner = (fl_owner_t)dp;
2416 fl.fl_file = stp->st_vfs_file;
2417 fl.fl_pid = current->tgid;
2419 /* vfs_setlease checks to see if delegation should be handed out.
2420 * the lock_manager callbacks fl_mylease and fl_change are used
2422 if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
2423 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
2424 unhash_delegation(dp);
2425 flag = NFS4_OPEN_DELEGATE_NONE;
2429 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2431 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2432 STATEID_VAL(&dp->dl_stateid));
2434 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2435 && flag == NFS4_OPEN_DELEGATE_NONE
2436 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2437 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2438 open->op_delegate_type = flag;
2442 * called with nfs4_lock_state() held.
2445 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2447 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2448 struct nfs4_file *fp = NULL;
2449 struct inode *ino = current_fh->fh_dentry->d_inode;
2450 struct nfs4_stateid *stp = NULL;
2451 struct nfs4_delegation *dp = NULL;
2454 status = nfserr_inval;
2455 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
2456 || !deny_valid(open->op_share_deny))
2459 * Lookup file; if found, lookup stateid and check open request,
2460 * and check for delegations in the process of being recalled.
2461 * If not found, create the nfs4_file struct
2463 fp = find_file(ino);
2465 if ((status = nfs4_check_open(fp, open, &stp)))
2467 status = nfs4_check_deleg(fp, open, &dp);
2471 status = nfserr_bad_stateid;
2472 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2474 status = nfserr_resource;
2475 fp = alloc_init_file(ino);
2481 * OPEN the file, or upgrade an existing OPEN.
2482 * If truncate fails, the OPEN fails.
2485 /* Stateid was found, this is an OPEN upgrade */
2486 status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
2489 update_stateid(&stp->st_stateid);
2491 /* Stateid was not found, this is a new OPEN */
2493 if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
2494 flags |= NFSD_MAY_READ;
2495 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2496 flags |= NFSD_MAY_WRITE;
2497 status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
2500 init_stateid(stp, fp, open);
2501 status = nfsd4_truncate(rqstp, current_fh, open);
2503 release_open_stateid(stp);
2506 if (nfsd4_has_session(&resp->cstate))
2507 update_stateid(&stp->st_stateid);
2509 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2511 if (nfsd4_has_session(&resp->cstate)) {
2512 open->op_stateowner->so_confirmed = 1;
2513 nfsd4_create_clid_dir(open->op_stateowner->so_client);
2517 * Attempt to hand out a delegation. No error return, because the
2518 * OPEN succeeds even if we fail.
2520 nfs4_open_delegation(current_fh, open, stp);
2524 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2525 STATEID_VAL(&stp->st_stateid));
2529 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2530 nfs4_set_claim_prev(open);
2532 * To finish the open response, we just need to set the rflags.
2534 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2535 if (!open->op_stateowner->so_confirmed &&
2536 !nfsd4_has_session(&resp->cstate))
2537 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2543 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2546 struct nfs4_client *clp;
2550 dprintk("process_renew(%08x/%08x): starting\n",
2551 clid->cl_boot, clid->cl_id);
2552 status = nfserr_stale_clientid;
2553 if (STALE_CLIENTID(clid))
2555 clp = find_confirmed_client(clid);
2556 status = nfserr_expired;
2558 /* We assume the client took too long to RENEW. */
2559 dprintk("nfsd4_renew: clientid not found!\n");
2563 status = nfserr_cb_path_down;
2564 if (!list_empty(&clp->cl_delegations)
2565 && !atomic_read(&clp->cl_cb_set))
2569 nfs4_unlock_state();
2573 struct lock_manager nfsd4_manager = {
2577 nfsd4_end_grace(void)
2579 dprintk("NFSD: end of grace period\n");
2580 nfsd4_recdir_purge_old();
2581 locks_end_grace(&nfsd4_manager);
2583 * Now that every NFSv4 client has had the chance to recover and
2584 * to see the (possibly new, possibly shorter) lease time, we
2585 * can safely set the next grace time to the current lease time:
2587 nfsd4_grace = nfsd4_lease;
2591 nfs4_laundromat(void)
2593 struct nfs4_client *clp;
2594 struct nfs4_stateowner *sop;
2595 struct nfs4_delegation *dp;
2596 struct list_head *pos, *next, reaplist;
2597 time_t cutoff = get_seconds() - nfsd4_lease;
2598 time_t t, clientid_val = nfsd4_lease;
2599 time_t u, test_val = nfsd4_lease;
2603 dprintk("NFSD: laundromat service - starting\n");
2604 if (locks_in_grace())
2606 INIT_LIST_HEAD(&reaplist);
2607 spin_lock(&client_lock);
2608 list_for_each_safe(pos, next, &client_lru) {
2609 clp = list_entry(pos, struct nfs4_client, cl_lru);
2610 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2611 t = clp->cl_time - cutoff;
2612 if (clientid_val > t)
2616 if (atomic_read(&clp->cl_refcount)) {
2617 dprintk("NFSD: client in use (clientid %08x)\n",
2618 clp->cl_clientid.cl_id);
2621 unhash_client_locked(clp);
2622 list_add(&clp->cl_lru, &reaplist);
2624 spin_unlock(&client_lock);
2625 list_for_each_safe(pos, next, &reaplist) {
2626 clp = list_entry(pos, struct nfs4_client, cl_lru);
2627 dprintk("NFSD: purging unused client (clientid %08x)\n",
2628 clp->cl_clientid.cl_id);
2629 nfsd4_remove_clid_dir(clp);
2632 spin_lock(&recall_lock);
2633 list_for_each_safe(pos, next, &del_recall_lru) {
2634 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2635 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2636 u = dp->dl_time - cutoff;
2641 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2643 list_move(&dp->dl_recall_lru, &reaplist);
2645 spin_unlock(&recall_lock);
2646 list_for_each_safe(pos, next, &reaplist) {
2647 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2648 list_del_init(&dp->dl_recall_lru);
2649 unhash_delegation(dp);
2651 test_val = nfsd4_lease;
2652 list_for_each_safe(pos, next, &close_lru) {
2653 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2654 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2655 u = sop->so_time - cutoff;
2660 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2662 release_openowner(sop);
2664 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2665 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2666 nfs4_unlock_state();
2667 return clientid_val;
2670 static struct workqueue_struct *laundry_wq;
2671 static void laundromat_main(struct work_struct *);
2672 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2675 laundromat_main(struct work_struct *not_used)
2679 t = nfs4_laundromat();
2680 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2681 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2684 static struct nfs4_stateowner *
2685 search_close_lru(u32 st_id, int flags)
2687 struct nfs4_stateowner *local = NULL;
2689 if (flags & CLOSE_STATE) {
2690 list_for_each_entry(local, &close_lru, so_close_lru) {
2691 if (local->so_id == st_id)
2699 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2701 return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
2705 STALE_STATEID(stateid_t *stateid)
2707 if (time_after((unsigned long)boot_time,
2708 (unsigned long)stateid->si_boot)) {
2709 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
2710 STATEID_VAL(stateid));
2717 EXPIRED_STATEID(stateid_t *stateid)
2719 if (time_before((unsigned long)boot_time,
2720 ((unsigned long)stateid->si_boot)) &&
2721 time_before((unsigned long)(stateid->si_boot + nfsd4_lease), get_seconds())) {
2722 dprintk("NFSD: expired stateid " STATEID_FMT "!\n",
2723 STATEID_VAL(stateid));
2730 stateid_error_map(stateid_t *stateid)
2732 if (STALE_STATEID(stateid))
2733 return nfserr_stale_stateid;
2734 if (EXPIRED_STATEID(stateid))
2735 return nfserr_expired;
2737 dprintk("NFSD: bad stateid " STATEID_FMT "!\n",
2738 STATEID_VAL(stateid));
2739 return nfserr_bad_stateid;
2743 access_permit_read(unsigned long access_bmap)
2745 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2746 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2747 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2751 access_permit_write(unsigned long access_bmap)
2753 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2754 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2758 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2760 __be32 status = nfserr_openmode;
2762 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2764 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2771 static inline __be32
2772 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2774 if (ONE_STATEID(stateid) && (flags & RD_STATE))
2776 else if (locks_in_grace()) {
2777 /* Answer in remaining cases depends on existance of
2778 * conflicting state; so we must wait out the grace period. */
2779 return nfserr_grace;
2780 } else if (flags & WR_STATE)
2781 return nfs4_share_conflict(current_fh,
2782 NFS4_SHARE_DENY_WRITE);
2783 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2784 return nfs4_share_conflict(current_fh,
2785 NFS4_SHARE_DENY_READ);
2789 * Allow READ/WRITE during grace period on recovered state only for files
2790 * that are not able to provide mandatory locking.
2793 grace_disallows_io(struct inode *inode)
2795 return locks_in_grace() && mandatory_lock(inode);
2798 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
2801 * When sessions are used the stateid generation number is ignored
2804 if ((flags & HAS_SESSION) && in->si_generation == 0)
2807 /* If the client sends us a stateid from the future, it's buggy: */
2808 if (in->si_generation > ref->si_generation)
2809 return nfserr_bad_stateid;
2811 * The following, however, can happen. For example, if the
2812 * client sends an open and some IO at the same time, the open
2813 * may bump si_generation while the IO is still in flight.
2814 * Thanks to hard links and renames, the client never knows what
2815 * file an open will affect. So it could avoid that situation
2816 * only by serializing all opens and IO from the same open
2817 * owner. To recover from the old_stateid error, the client
2818 * will just have to retry the IO:
2820 if (in->si_generation < ref->si_generation)
2821 return nfserr_old_stateid;
2826 static int is_delegation_stateid(stateid_t *stateid)
2828 return stateid->si_fileid == 0;
2832 * Checks for stateid operations
2835 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
2836 stateid_t *stateid, int flags, struct file **filpp)
2838 struct nfs4_stateid *stp = NULL;
2839 struct nfs4_delegation *dp = NULL;
2840 struct svc_fh *current_fh = &cstate->current_fh;
2841 struct inode *ino = current_fh->fh_dentry->d_inode;
2847 if (grace_disallows_io(ino))
2848 return nfserr_grace;
2850 if (nfsd4_has_session(cstate))
2851 flags |= HAS_SESSION;
2853 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
2854 return check_special_stateids(current_fh, stateid, flags);
2856 status = nfserr_stale_stateid;
2857 if (STALE_STATEID(stateid))
2860 status = nfserr_bad_stateid;
2861 if (is_delegation_stateid(stateid)) {
2862 dp = find_delegation_stateid(ino, stateid);
2864 status = stateid_error_map(stateid);
2867 status = check_stateid_generation(stateid, &dp->dl_stateid,
2871 status = nfs4_check_delegmode(dp, flags);
2874 renew_client(dp->dl_client);
2876 *filpp = dp->dl_vfs_file;
2877 } else { /* open or lock stateid */
2878 stp = find_stateid(stateid, flags);
2880 status = stateid_error_map(stateid);
2883 if (nfs4_check_fh(current_fh, stp))
2885 if (!stp->st_stateowner->so_confirmed)
2887 status = check_stateid_generation(stateid, &stp->st_stateid,
2891 status = nfs4_check_openmode(stp, flags);
2894 renew_client(stp->st_stateowner->so_client);
2896 *filpp = stp->st_vfs_file;
2906 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
2907 RD_STATE : WR_STATE;
2911 * Checks for sequence id mutating operations.
2914 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
2915 stateid_t *stateid, int flags,
2916 struct nfs4_stateowner **sopp,
2917 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
2919 struct nfs4_stateid *stp;
2920 struct nfs4_stateowner *sop;
2921 struct svc_fh *current_fh = &cstate->current_fh;
2924 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
2925 seqid, STATEID_VAL(stateid));
2930 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
2931 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
2932 return nfserr_bad_stateid;
2935 if (STALE_STATEID(stateid))
2936 return nfserr_stale_stateid;
2938 if (nfsd4_has_session(cstate))
2939 flags |= HAS_SESSION;
2942 * We return BAD_STATEID if filehandle doesn't match stateid,
2943 * the confirmed flag is incorrecly set, or the generation
2944 * number is incorrect.
2946 stp = find_stateid(stateid, flags);
2949 * Also, we should make sure this isn't just the result of
2952 sop = search_close_lru(stateid->si_stateownerid, flags);
2954 return stateid_error_map(stateid);
2960 *sopp = sop = stp->st_stateowner;
2963 clientid_t *lockclid = &lock->v.new.clientid;
2964 struct nfs4_client *clp = sop->so_client;
2968 lkflg = setlkflg(lock->lk_type);
2970 if (lock->lk_is_new) {
2971 if (!sop->so_is_open_owner)
2972 return nfserr_bad_stateid;
2973 if (!(flags & HAS_SESSION) &&
2974 !same_clid(&clp->cl_clientid, lockclid))
2975 return nfserr_bad_stateid;
2976 /* stp is the open stateid */
2977 status = nfs4_check_openmode(stp, lkflg);
2981 /* stp is the lock stateid */
2982 status = nfs4_check_openmode(stp->st_openstp, lkflg);
2988 if (nfs4_check_fh(current_fh, stp)) {
2989 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
2990 return nfserr_bad_stateid;
2994 * We now validate the seqid and stateid generation numbers.
2995 * For the moment, we ignore the possibility of
2996 * generation number wraparound.
2998 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
3001 if (sop->so_confirmed && flags & CONFIRM) {
3002 dprintk("NFSD: preprocess_seqid_op: expected"
3003 " unconfirmed stateowner!\n");
3004 return nfserr_bad_stateid;
3006 if (!sop->so_confirmed && !(flags & CONFIRM)) {
3007 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3008 " confirmed yet!\n");
3009 return nfserr_bad_stateid;
3011 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
3014 renew_client(sop->so_client);
3018 if (seqid == sop->so_seqid - 1) {
3019 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
3020 /* indicate replay to calling function */
3021 return nfserr_replay_me;
3023 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3024 sop->so_seqid, seqid);
3026 return nfserr_bad_seqid;
3030 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3031 struct nfsd4_open_confirm *oc)
3034 struct nfs4_stateowner *sop;
3035 struct nfs4_stateid *stp;
3037 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3038 (int)cstate->current_fh.fh_dentry->d_name.len,
3039 cstate->current_fh.fh_dentry->d_name.name);
3041 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3047 if ((status = nfs4_preprocess_seqid_op(cstate,
3048 oc->oc_seqid, &oc->oc_req_stateid,
3049 CONFIRM | OPEN_STATE,
3050 &oc->oc_stateowner, &stp, NULL)))
3053 sop = oc->oc_stateowner;
3054 sop->so_confirmed = 1;
3055 update_stateid(&stp->st_stateid);
3056 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3057 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3058 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid));
3060 nfsd4_create_clid_dir(sop->so_client);
3062 if (oc->oc_stateowner) {
3063 nfs4_get_stateowner(oc->oc_stateowner);
3064 cstate->replay_owner = oc->oc_stateowner;
3066 nfs4_unlock_state();
3072 * unset all bits in union bitmap (bmap) that
3073 * do not exist in share (from successful OPEN_DOWNGRADE)
3076 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3079 for (i = 1; i < 4; i++) {
3080 if ((i & access) != i)
3081 __clear_bit(i, bmap);
3086 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3089 for (i = 0; i < 4; i++) {
3090 if ((i & deny) != i)
3091 __clear_bit(i, bmap);
3096 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3097 struct nfsd4_compound_state *cstate,
3098 struct nfsd4_open_downgrade *od)
3101 struct nfs4_stateid *stp;
3102 unsigned int share_access;
3104 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3105 (int)cstate->current_fh.fh_dentry->d_name.len,
3106 cstate->current_fh.fh_dentry->d_name.name);
3108 if (!access_valid(od->od_share_access, cstate->minorversion)
3109 || !deny_valid(od->od_share_deny))
3110 return nfserr_inval;
3113 if ((status = nfs4_preprocess_seqid_op(cstate,
3117 &od->od_stateowner, &stp, NULL)))
3120 status = nfserr_inval;
3121 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3122 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3123 stp->st_access_bmap, od->od_share_access);
3126 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3127 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3128 stp->st_deny_bmap, od->od_share_deny);
3131 set_access(&share_access, stp->st_access_bmap);
3132 nfs4_file_downgrade(stp->st_vfs_file,
3133 share_access & ~od->od_share_access);
3135 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3136 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3138 update_stateid(&stp->st_stateid);
3139 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3142 if (od->od_stateowner) {
3143 nfs4_get_stateowner(od->od_stateowner);
3144 cstate->replay_owner = od->od_stateowner;
3146 nfs4_unlock_state();
3151 * nfs4_unlock_state() called after encode
3154 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3155 struct nfsd4_close *close)
3158 struct nfs4_stateid *stp;
3160 dprintk("NFSD: nfsd4_close on file %.*s\n",
3161 (int)cstate->current_fh.fh_dentry->d_name.len,
3162 cstate->current_fh.fh_dentry->d_name.name);
3165 /* check close_lru for replay */
3166 if ((status = nfs4_preprocess_seqid_op(cstate,
3169 OPEN_STATE | CLOSE_STATE,
3170 &close->cl_stateowner, &stp, NULL)))
3173 update_stateid(&stp->st_stateid);
3174 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3176 /* release_stateid() calls nfsd_close() if needed */
3177 release_open_stateid(stp);
3179 /* place unused nfs4_stateowners on so_close_lru list to be
3180 * released by the laundromat service after the lease period
3181 * to enable us to handle CLOSE replay
3183 if (list_empty(&close->cl_stateowner->so_stateids))
3184 move_to_close_lru(close->cl_stateowner);
3186 if (close->cl_stateowner) {
3187 nfs4_get_stateowner(close->cl_stateowner);
3188 cstate->replay_owner = close->cl_stateowner;
3190 nfs4_unlock_state();
3195 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3196 struct nfsd4_delegreturn *dr)
3198 struct nfs4_delegation *dp;
3199 stateid_t *stateid = &dr->dr_stateid;
3200 struct inode *inode;
3204 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3206 inode = cstate->current_fh.fh_dentry->d_inode;
3208 if (nfsd4_has_session(cstate))
3209 flags |= HAS_SESSION;
3211 status = nfserr_bad_stateid;
3212 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3214 status = nfserr_stale_stateid;
3215 if (STALE_STATEID(stateid))
3217 status = nfserr_bad_stateid;
3218 if (!is_delegation_stateid(stateid))
3220 dp = find_delegation_stateid(inode, stateid);
3222 status = stateid_error_map(stateid);
3225 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
3228 renew_client(dp->dl_client);
3230 unhash_delegation(dp);
3232 nfs4_unlock_state();
3239 * Lock owner state (byte-range locks)
3241 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3242 #define LOCK_HASH_BITS 8
3243 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3244 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3247 end_offset(u64 start, u64 len)
3252 return end >= start ? end: NFS4_MAX_UINT64;
3255 /* last octet in a range */
3257 last_byte_offset(u64 start, u64 len)
3263 return end > start ? end - 1: NFS4_MAX_UINT64;
3266 #define lockownerid_hashval(id) \
3267 ((id) & LOCK_HASH_MASK)
3269 static inline unsigned int
3270 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3271 struct xdr_netobj *ownername)
3273 return (file_hashval(inode) + cl_id
3274 + opaque_hashval(ownername->data, ownername->len))
3278 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3279 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3280 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3282 static struct nfs4_stateid *
3283 find_stateid(stateid_t *stid, int flags)
3285 struct nfs4_stateid *local;
3286 u32 st_id = stid->si_stateownerid;
3287 u32 f_id = stid->si_fileid;
3288 unsigned int hashval;
3290 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
3291 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
3292 hashval = stateid_hashval(st_id, f_id);
3293 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3294 if ((local->st_stateid.si_stateownerid == st_id) &&
3295 (local->st_stateid.si_fileid == f_id))
3300 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
3301 hashval = stateid_hashval(st_id, f_id);
3302 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3303 if ((local->st_stateid.si_stateownerid == st_id) &&
3304 (local->st_stateid.si_fileid == f_id))
3311 static struct nfs4_delegation *
3312 find_delegation_stateid(struct inode *ino, stateid_t *stid)
3314 struct nfs4_file *fp;
3315 struct nfs4_delegation *dl;
3317 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__,
3320 fp = find_file(ino);
3323 dl = find_delegation_file(fp, stid);
3329 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3330 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3331 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3332 * locking, this prevents us from being completely protocol-compliant. The
3333 * real solution to this problem is to start using unsigned file offsets in
3334 * the VFS, but this is a very deep change!
3337 nfs4_transform_lock_offset(struct file_lock *lock)
3339 if (lock->fl_start < 0)
3340 lock->fl_start = OFFSET_MAX;
3341 if (lock->fl_end < 0)
3342 lock->fl_end = OFFSET_MAX;
3345 /* Hack!: For now, we're defining this just so we can use a pointer to it
3346 * as a unique cookie to identify our (NFSv4's) posix locks. */
3347 static const struct lock_manager_operations nfsd_posix_mng_ops = {
3351 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3353 struct nfs4_stateowner *sop;
3356 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3357 sop = (struct nfs4_stateowner *) fl->fl_owner;
3358 hval = lockownerid_hashval(sop->so_id);
3359 kref_get(&sop->so_ref);
3361 deny->ld_clientid = sop->so_client->cl_clientid;
3363 deny->ld_sop = NULL;
3364 deny->ld_clientid.cl_boot = 0;
3365 deny->ld_clientid.cl_id = 0;
3367 deny->ld_start = fl->fl_start;
3368 deny->ld_length = NFS4_MAX_UINT64;
3369 if (fl->fl_end != NFS4_MAX_UINT64)
3370 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3371 deny->ld_type = NFS4_READ_LT;
3372 if (fl->fl_type != F_RDLCK)
3373 deny->ld_type = NFS4_WRITE_LT;
3376 static struct nfs4_stateowner *
3377 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3378 struct xdr_netobj *owner)
3380 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3381 struct nfs4_stateowner *op;
3383 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
3384 if (same_owner_str(op, owner, clid))
3391 * Alloc a lock owner structure.
3392 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3395 * strhashval = lock_ownerstr_hashval
3398 static struct nfs4_stateowner *
3399 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3400 struct nfs4_stateowner *sop;
3401 struct nfs4_replay *rp;
3402 unsigned int idhashval;
3404 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3406 idhashval = lockownerid_hashval(current_ownerid);
3407 INIT_LIST_HEAD(&sop->so_idhash);
3408 INIT_LIST_HEAD(&sop->so_strhash);
3409 INIT_LIST_HEAD(&sop->so_perclient);
3410 INIT_LIST_HEAD(&sop->so_stateids);
3411 INIT_LIST_HEAD(&sop->so_perstateid);
3412 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3414 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3415 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
3416 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
3417 sop->so_is_open_owner = 0;
3418 sop->so_id = current_ownerid++;
3419 sop->so_client = clp;
3420 /* It is the openowner seqid that will be incremented in encode in the
3421 * case of new lockowners; so increment the lock seqid manually: */
3422 sop->so_seqid = lock->lk_new_lock_seqid + 1;
3423 sop->so_confirmed = 1;
3424 rp = &sop->so_replay;
3425 rp->rp_status = nfserr_serverfault;
3427 rp->rp_buf = rp->rp_ibuf;
3431 static struct nfs4_stateid *
3432 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3434 struct nfs4_stateid *stp;
3435 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3437 stp = nfs4_alloc_stateid();
3440 INIT_LIST_HEAD(&stp->st_hash);
3441 INIT_LIST_HEAD(&stp->st_perfile);
3442 INIT_LIST_HEAD(&stp->st_perstateowner);
3443 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
3444 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
3445 list_add(&stp->st_perfile, &fp->fi_stateids);
3446 list_add(&stp->st_perstateowner, &sop->so_stateids);
3447 stp->st_stateowner = sop;
3450 stp->st_stateid.si_boot = get_seconds();
3451 stp->st_stateid.si_stateownerid = sop->so_id;
3452 stp->st_stateid.si_fileid = fp->fi_id;
3453 stp->st_stateid.si_generation = 0;
3454 stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
3455 stp->st_access_bmap = open_stp->st_access_bmap;
3456 stp->st_deny_bmap = open_stp->st_deny_bmap;
3457 stp->st_openstp = open_stp;
3464 check_lock_length(u64 offset, u64 length)
3466 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
3467 LOFF_OVERFLOW(offset, length)));
3474 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3475 struct nfsd4_lock *lock)
3477 struct nfs4_stateowner *open_sop = NULL;
3478 struct nfs4_stateowner *lock_sop = NULL;
3479 struct nfs4_stateid *lock_stp;
3481 struct file_lock file_lock;
3482 struct file_lock conflock;
3484 unsigned int strhashval;
3488 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3489 (long long) lock->lk_offset,
3490 (long long) lock->lk_length);
3492 if (check_lock_length(lock->lk_offset, lock->lk_length))
3493 return nfserr_inval;
3495 if ((status = fh_verify(rqstp, &cstate->current_fh,
3496 S_IFREG, NFSD_MAY_LOCK))) {
3497 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3503 if (lock->lk_is_new) {
3505 * Client indicates that this is a new lockowner.
3506 * Use open owner and open stateid to create lock owner and
3509 struct nfs4_stateid *open_stp = NULL;
3510 struct nfs4_file *fp;
3512 status = nfserr_stale_clientid;
3513 if (!nfsd4_has_session(cstate) &&
3514 STALE_CLIENTID(&lock->lk_new_clientid))
3517 /* validate and update open stateid and open seqid */
3518 status = nfs4_preprocess_seqid_op(cstate,
3519 lock->lk_new_open_seqid,
3520 &lock->lk_new_open_stateid,
3522 &lock->lk_replay_owner, &open_stp,
3526 open_sop = lock->lk_replay_owner;
3527 /* create lockowner and lock stateid */
3528 fp = open_stp->st_file;
3529 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3530 open_sop->so_client->cl_clientid.cl_id,
3531 &lock->v.new.owner);
3532 /* XXX: Do we need to check for duplicate stateowners on
3533 * the same file, or should they just be allowed (and
3534 * create new stateids)? */
3535 status = nfserr_resource;
3536 lock_sop = alloc_init_lock_stateowner(strhashval,
3537 open_sop->so_client, open_stp, lock);
3538 if (lock_sop == NULL)
3540 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
3541 if (lock_stp == NULL)
3544 /* lock (lock owner + lock stateid) already exists */
3545 status = nfs4_preprocess_seqid_op(cstate,
3546 lock->lk_old_lock_seqid,
3547 &lock->lk_old_lock_stateid,
3549 &lock->lk_replay_owner, &lock_stp, lock);
3552 lock_sop = lock->lk_replay_owner;
3554 /* lock->lk_replay_owner and lock_stp have been created or found */
3555 filp = lock_stp->st_vfs_file;
3557 status = nfserr_grace;
3558 if (locks_in_grace() && !lock->lk_reclaim)
3560 status = nfserr_no_grace;
3561 if (!locks_in_grace() && lock->lk_reclaim)
3564 locks_init_lock(&file_lock);
3565 switch (lock->lk_type) {
3568 file_lock.fl_type = F_RDLCK;
3572 case NFS4_WRITEW_LT:
3573 file_lock.fl_type = F_WRLCK;
3577 status = nfserr_inval;
3580 file_lock.fl_owner = (fl_owner_t)lock_sop;
3581 file_lock.fl_pid = current->tgid;
3582 file_lock.fl_file = filp;
3583 file_lock.fl_flags = FL_POSIX;
3584 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3586 file_lock.fl_start = lock->lk_offset;
3587 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
3588 nfs4_transform_lock_offset(&file_lock);
3591 * Try to lock the file in the VFS.
3592 * Note: locks.c uses the BKL to protect the inode's lock list.
3595 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
3597 case 0: /* success! */
3598 update_stateid(&lock_stp->st_stateid);
3599 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3603 case (EAGAIN): /* conflock holds conflicting lock */
3604 status = nfserr_denied;
3605 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3606 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3609 status = nfserr_deadlock;
3612 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
3613 status = nfserr_resource;
3617 if (status && lock->lk_is_new && lock_sop)
3618 release_lockowner(lock_sop);
3619 if (lock->lk_replay_owner) {
3620 nfs4_get_stateowner(lock->lk_replay_owner);
3621 cstate->replay_owner = lock->lk_replay_owner;
3623 nfs4_unlock_state();
3628 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3629 * so we do a temporary open here just to get an open file to pass to
3630 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3633 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3638 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3641 err = vfs_test_lock(file, lock);
3650 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3651 struct nfsd4_lockt *lockt)
3653 struct inode *inode;
3654 struct file_lock file_lock;
3658 if (locks_in_grace())
3659 return nfserr_grace;
3661 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3662 return nfserr_inval;
3664 lockt->lt_stateowner = NULL;
3667 status = nfserr_stale_clientid;
3668 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
3671 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
3672 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
3673 if (status == nfserr_symlink)
3674 status = nfserr_inval;
3678 inode = cstate->current_fh.fh_dentry->d_inode;
3679 locks_init_lock(&file_lock);
3680 switch (lockt->lt_type) {
3683 file_lock.fl_type = F_RDLCK;
3686 case NFS4_WRITEW_LT:
3687 file_lock.fl_type = F_WRLCK;
3690 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
3691 status = nfserr_inval;
3695 lockt->lt_stateowner = find_lockstateowner_str(inode,
3696 &lockt->lt_clientid, &lockt->lt_owner);
3697 if (lockt->lt_stateowner)
3698 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3699 file_lock.fl_pid = current->tgid;
3700 file_lock.fl_flags = FL_POSIX;
3702 file_lock.fl_start = lockt->lt_offset;
3703 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
3705 nfs4_transform_lock_offset(&file_lock);
3708 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
3710 status = nfserrno(error);
3713 if (file_lock.fl_type != F_UNLCK) {
3714 status = nfserr_denied;
3715 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
3718 nfs4_unlock_state();
3723 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3724 struct nfsd4_locku *locku)
3726 struct nfs4_stateid *stp;
3727 struct file *filp = NULL;
3728 struct file_lock file_lock;
3732 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3733 (long long) locku->lu_offset,
3734 (long long) locku->lu_length);
3736 if (check_lock_length(locku->lu_offset, locku->lu_length))
3737 return nfserr_inval;
3741 if ((status = nfs4_preprocess_seqid_op(cstate,
3745 &locku->lu_stateowner, &stp, NULL)))
3748 filp = stp->st_vfs_file;
3750 locks_init_lock(&file_lock);
3751 file_lock.fl_type = F_UNLCK;
3752 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3753 file_lock.fl_pid = current->tgid;
3754 file_lock.fl_file = filp;
3755 file_lock.fl_flags = FL_POSIX;
3756 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3757 file_lock.fl_start = locku->lu_offset;
3759 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
3760 nfs4_transform_lock_offset(&file_lock);
3763 * Try to unlock the file in the VFS.
3765 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
3767 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
3771 * OK, unlock succeeded; the only thing left to do is update the stateid.
3773 update_stateid(&stp->st_stateid);
3774 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3777 if (locku->lu_stateowner) {
3778 nfs4_get_stateowner(locku->lu_stateowner);
3779 cstate->replay_owner = locku->lu_stateowner;
3781 nfs4_unlock_state();
3785 status = nfserrno(err);
3791 * 1: locks held by lockowner
3792 * 0: no locks held by lockowner
3795 check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
3797 struct file_lock **flpp;
3798 struct inode *inode = filp->f_path.dentry->d_inode;
3802 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
3803 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
3814 nfsd4_release_lockowner(struct svc_rqst *rqstp,
3815 struct nfsd4_compound_state *cstate,
3816 struct nfsd4_release_lockowner *rlockowner)
3818 clientid_t *clid = &rlockowner->rl_clientid;
3819 struct nfs4_stateowner *sop;
3820 struct nfs4_stateid *stp;
3821 struct xdr_netobj *owner = &rlockowner->rl_owner;
3822 struct list_head matches;
3826 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
3827 clid->cl_boot, clid->cl_id);
3829 /* XXX check for lease expiration */
3831 status = nfserr_stale_clientid;
3832 if (STALE_CLIENTID(clid))
3837 status = nfserr_locks_held;
3838 /* XXX: we're doing a linear search through all the lockowners.
3839 * Yipes! For now we'll just hope clients aren't really using
3840 * release_lockowner much, but eventually we have to fix these
3841 * data structures. */
3842 INIT_LIST_HEAD(&matches);
3843 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3844 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
3845 if (!same_owner_str(sop, owner, clid))
3847 list_for_each_entry(stp, &sop->so_stateids,
3849 if (check_for_locks(stp->st_vfs_file, sop))
3851 /* Note: so_perclient unused for lockowners,
3852 * so it's OK to fool with here. */
3853 list_add(&sop->so_perclient, &matches);
3857 /* Clients probably won't expect us to return with some (but not all)
3858 * of the lockowner state released; so don't release any until all
3859 * have been checked. */
3861 while (!list_empty(&matches)) {
3862 sop = list_entry(matches.next, struct nfs4_stateowner,
3864 /* unhash_stateowner deletes so_perclient only
3865 * for openowners. */
3866 list_del(&sop->so_perclient);
3867 release_lockowner(sop);
3870 nfs4_unlock_state();
3874 static inline struct nfs4_client_reclaim *
3877 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
3881 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
3883 unsigned int strhashval = clientstr_hashval(name);
3884 struct nfs4_client *clp;
3886 clp = find_confirmed_client_by_str(name, strhashval, use_exchange_id);
3891 * failure => all reset bets are off, nfserr_no_grace...
3894 nfs4_client_to_reclaim(const char *name)
3896 unsigned int strhashval;
3897 struct nfs4_client_reclaim *crp = NULL;
3899 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
3900 crp = alloc_reclaim();
3903 strhashval = clientstr_hashval(name);
3904 INIT_LIST_HEAD(&crp->cr_strhash);
3905 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
3906 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
3907 reclaim_str_hashtbl_size++;
3912 nfs4_release_reclaim(void)
3914 struct nfs4_client_reclaim *crp = NULL;
3917 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3918 while (!list_empty(&reclaim_str_hashtbl[i])) {
3919 crp = list_entry(reclaim_str_hashtbl[i].next,
3920 struct nfs4_client_reclaim, cr_strhash);
3921 list_del(&crp->cr_strhash);
3923 reclaim_str_hashtbl_size--;
3926 BUG_ON(reclaim_str_hashtbl_size);
3930 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
3931 static struct nfs4_client_reclaim *
3932 nfs4_find_reclaim_client(clientid_t *clid)
3934 unsigned int strhashval;
3935 struct nfs4_client *clp;
3936 struct nfs4_client_reclaim *crp = NULL;
3939 /* find clientid in conf_id_hashtbl */
3940 clp = find_confirmed_client(clid);
3944 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
3945 clp->cl_name.len, clp->cl_name.data,
3948 /* find clp->cl_name in reclaim_str_hashtbl */
3949 strhashval = clientstr_hashval(clp->cl_recdir);
3950 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
3951 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
3959 * Called from OPEN. Look for clientid in reclaim list.
3962 nfs4_check_open_reclaim(clientid_t *clid)
3964 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
3967 /* initialization to perform at module load time: */
3970 nfs4_state_init(void)
3974 status = nfsd4_init_slabs();
3977 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
3978 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
3979 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
3980 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
3981 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
3982 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
3984 for (i = 0; i < SESSION_HASH_SIZE; i++)
3985 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
3986 for (i = 0; i < FILE_HASH_SIZE; i++) {
3987 INIT_LIST_HEAD(&file_hashtbl[i]);
3989 for (i = 0; i < OWNER_HASH_SIZE; i++) {
3990 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
3991 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
3993 for (i = 0; i < STATEID_HASH_SIZE; i++) {
3994 INIT_LIST_HEAD(&stateid_hashtbl[i]);
3995 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
3997 for (i = 0; i < LOCK_HASH_SIZE; i++) {
3998 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
3999 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4001 memset(&onestateid, ~0, sizeof(stateid_t));
4002 INIT_LIST_HEAD(&close_lru);
4003 INIT_LIST_HEAD(&client_lru);
4004 INIT_LIST_HEAD(&del_recall_lru);
4005 reclaim_str_hashtbl_size = 0;
4010 nfsd4_load_reboot_recovery_data(void)
4015 nfsd4_init_recdir(user_recovery_dirname);
4016 status = nfsd4_recdir_load();
4017 nfs4_unlock_state();
4019 printk("NFSD: Failure reading reboot recovery data\n");
4023 * Since the lifetime of a delegation isn't limited to that of an open, a
4024 * client may quite reasonably hang on to a delegation as long as it has
4025 * the inode cached. This becomes an obvious problem the first time a
4026 * client's inode cache approaches the size of the server's total memory.
4028 * For now we avoid this problem by imposing a hard limit on the number
4029 * of delegations, which varies according to the server's memory size.
4032 set_max_delegations(void)
4035 * Allow at most 4 delegations per megabyte of RAM. Quick
4036 * estimates suggest that in the worst case (where every delegation
4037 * is for a different inode), a delegation could take about 1.5K,
4038 * giving a worst case usage of about 6% of memory.
4040 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4043 /* initialization to perform when the nfsd service is started: */
4046 __nfs4_state_start(void)
4050 boot_time = get_seconds();
4051 locks_start_grace(&nfsd4_manager);
4052 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4054 ret = set_callback_cred();
4057 laundry_wq = create_singlethread_workqueue("nfsd4");
4058 if (laundry_wq == NULL)
4060 ret = nfsd4_create_callback_queue();
4062 goto out_free_laundry;
4063 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4064 set_max_delegations();
4067 destroy_workqueue(laundry_wq);
4072 nfs4_state_start(void)
4078 nfsd4_load_reboot_recovery_data();
4079 ret = __nfs4_state_start();
4087 __nfs4_state_shutdown(void)
4090 struct nfs4_client *clp = NULL;
4091 struct nfs4_delegation *dp = NULL;
4092 struct list_head *pos, *next, reaplist;
4094 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4095 while (!list_empty(&conf_id_hashtbl[i])) {
4096 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4099 while (!list_empty(&unconf_str_hashtbl[i])) {
4100 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4104 INIT_LIST_HEAD(&reaplist);
4105 spin_lock(&recall_lock);
4106 list_for_each_safe(pos, next, &del_recall_lru) {
4107 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4108 list_move(&dp->dl_recall_lru, &reaplist);
4110 spin_unlock(&recall_lock);
4111 list_for_each_safe(pos, next, &reaplist) {
4112 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4113 list_del_init(&dp->dl_recall_lru);
4114 unhash_delegation(dp);
4117 nfsd4_shutdown_recdir();
4122 nfs4_state_shutdown(void)
4124 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4125 destroy_workqueue(laundry_wq);
4126 locks_end_grace(&nfsd4_manager);
4128 nfs4_release_reclaim();
4129 __nfs4_state_shutdown();
4130 nfsd4_destroy_callback_queue();
4131 nfs4_unlock_state();
4135 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4136 * accessed when nfsd is starting.
4139 nfs4_set_recdir(char *recdir)
4141 strcpy(user_recovery_dirname, recdir);
4145 * Change the NFSv4 recovery directory to recdir.
4148 nfs4_reset_recoverydir(char *recdir)
4153 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
4157 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
4158 nfs4_set_recdir(recdir);
4166 nfs4_recoverydir(void)
4168 return user_recovery_dirname;