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>
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;
54 static stateid_t zerostateid; /* bits all 0 */
55 static stateid_t onestateid; /* bits all 1 */
56 static u64 current_sessionid = 1;
58 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
59 #define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
61 /* forward declarations */
62 static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
63 static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
64 static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
65 static void nfs4_set_recdir(char *recdir);
69 /* Currently used for almost all code touching nfsv4 state: */
70 static DEFINE_MUTEX(client_mutex);
73 * Currently used for the del_recall_lru and file hash table. In an
74 * effort to decrease the scope of the client_mutex, this spinlock may
75 * eventually cover more:
77 static DEFINE_SPINLOCK(recall_lock);
79 static struct kmem_cache *stateowner_slab = NULL;
80 static struct kmem_cache *file_slab = NULL;
81 static struct kmem_cache *stateid_slab = NULL;
82 static struct kmem_cache *deleg_slab = NULL;
87 mutex_lock(&client_mutex);
91 nfs4_unlock_state(void)
93 mutex_unlock(&client_mutex);
97 opaque_hashval(const void *ptr, int nbytes)
99 unsigned char *cptr = (unsigned char *) ptr;
109 static struct list_head del_recall_lru;
112 put_nfs4_file(struct nfs4_file *fi)
114 if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
115 list_del(&fi->fi_hash);
116 spin_unlock(&recall_lock);
118 kmem_cache_free(file_slab, fi);
123 get_nfs4_file(struct nfs4_file *fi)
125 atomic_inc(&fi->fi_ref);
128 static int num_delegations;
129 unsigned int max_delegations;
132 * Open owner state (share locks)
135 /* hash tables for nfs4_stateowner */
136 #define OWNER_HASH_BITS 8
137 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
138 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
140 #define ownerid_hashval(id) \
141 ((id) & OWNER_HASH_MASK)
142 #define ownerstr_hashval(clientid, ownername) \
143 (((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
145 static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
146 static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
148 /* hash table for nfs4_file */
149 #define FILE_HASH_BITS 8
150 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
151 #define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
152 /* hash table for (open)nfs4_stateid */
153 #define STATEID_HASH_BITS 10
154 #define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
155 #define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
157 #define file_hashval(x) \
158 hash_ptr(x, FILE_HASH_BITS)
159 #define stateid_hashval(owner_id, file_id) \
160 (((owner_id) + (file_id)) & STATEID_HASH_MASK)
162 static struct list_head file_hashtbl[FILE_HASH_SIZE];
163 static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
165 static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
167 BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
168 atomic_inc(&fp->fi_access[oflag]);
171 static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
173 if (oflag == O_RDWR) {
174 __nfs4_file_get_access(fp, O_RDONLY);
175 __nfs4_file_get_access(fp, O_WRONLY);
177 __nfs4_file_get_access(fp, oflag);
180 static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
182 if (fp->fi_fds[oflag]) {
183 fput(fp->fi_fds[oflag]);
184 fp->fi_fds[oflag] = NULL;
188 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
190 if (atomic_dec_and_test(&fp->fi_access[oflag])) {
191 nfs4_file_put_fd(fp, O_RDWR);
192 nfs4_file_put_fd(fp, oflag);
196 static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
198 if (oflag == O_RDWR) {
199 __nfs4_file_put_access(fp, O_RDONLY);
200 __nfs4_file_put_access(fp, O_WRONLY);
202 __nfs4_file_put_access(fp, oflag);
205 static struct nfs4_delegation *
206 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
208 struct nfs4_delegation *dp;
209 struct nfs4_file *fp = stp->st_file;
211 dprintk("NFSD alloc_init_deleg\n");
213 * Major work on the lease subsystem (for example, to support
214 * calbacks on stat) will be required before we can support
215 * write delegations properly.
217 if (type != NFS4_OPEN_DELEGATE_READ)
219 if (fp->fi_had_conflict)
221 if (num_delegations > max_delegations)
223 dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
227 INIT_LIST_HEAD(&dp->dl_perfile);
228 INIT_LIST_HEAD(&dp->dl_perclnt);
229 INIT_LIST_HEAD(&dp->dl_recall_lru);
233 dp->dl_vfs_file = find_readable_file(fp);
234 get_file(dp->dl_vfs_file);
237 dp->dl_stateid.si_boot = boot_time;
238 dp->dl_stateid.si_stateownerid = current_delegid++;
239 dp->dl_stateid.si_fileid = 0;
240 dp->dl_stateid.si_generation = 0;
241 fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
243 atomic_set(&dp->dl_count, 1);
244 list_add(&dp->dl_perfile, &fp->fi_delegations);
245 list_add(&dp->dl_perclnt, &clp->cl_delegations);
246 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
251 nfs4_put_delegation(struct nfs4_delegation *dp)
253 if (atomic_dec_and_test(&dp->dl_count)) {
254 dprintk("NFSD: freeing dp %p\n",dp);
255 put_nfs4_file(dp->dl_file);
256 fput(dp->dl_vfs_file);
257 kmem_cache_free(deleg_slab, dp);
262 /* Remove the associated file_lock first, then remove the delegation.
263 * lease_modify() is called to remove the FS_LEASE file_lock from
264 * the i_flock list, eventually calling nfsd's lock_manager
265 * fl_release_callback.
268 nfs4_close_delegation(struct nfs4_delegation *dp)
270 dprintk("NFSD: close_delegation dp %p\n",dp);
271 /* XXX: do we even need this check?: */
273 vfs_setlease(dp->dl_vfs_file, F_UNLCK, &dp->dl_flock);
276 /* Called under the state lock. */
278 unhash_delegation(struct nfs4_delegation *dp)
280 list_del_init(&dp->dl_perfile);
281 list_del_init(&dp->dl_perclnt);
282 spin_lock(&recall_lock);
283 list_del_init(&dp->dl_recall_lru);
284 spin_unlock(&recall_lock);
285 nfs4_close_delegation(dp);
286 nfs4_put_delegation(dp);
293 /* client_lock protects the client lru list and session hash table */
294 static DEFINE_SPINLOCK(client_lock);
296 /* Hash tables for nfs4_clientid state */
297 #define CLIENT_HASH_BITS 4
298 #define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
299 #define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
301 #define clientid_hashval(id) \
302 ((id) & CLIENT_HASH_MASK)
303 #define clientstr_hashval(name) \
304 (opaque_hashval((name), 8) & CLIENT_HASH_MASK)
306 * reclaim_str_hashtbl[] holds known client info from previous reset/reboot
307 * used in reboot/reset lease grace period processing
309 * conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
310 * setclientid_confirmed info.
312 * unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
315 * client_lru holds client queue ordered by nfs4_client.cl_time
318 * close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
319 * for last close replay.
321 static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
322 static int reclaim_str_hashtbl_size = 0;
323 static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
324 static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
325 static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
326 static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
327 static struct list_head client_lru;
328 static struct list_head close_lru;
330 static void unhash_generic_stateid(struct nfs4_stateid *stp)
332 list_del(&stp->st_hash);
333 list_del(&stp->st_perfile);
334 list_del(&stp->st_perstateowner);
337 static void free_generic_stateid(struct nfs4_stateid *stp)
339 put_nfs4_file(stp->st_file);
340 kmem_cache_free(stateid_slab, stp);
343 static void release_lock_stateid(struct nfs4_stateid *stp)
347 unhash_generic_stateid(stp);
348 file = find_any_file(stp->st_file);
350 locks_remove_posix(file, (fl_owner_t)stp->st_stateowner);
351 free_generic_stateid(stp);
354 static void unhash_lockowner(struct nfs4_stateowner *sop)
356 struct nfs4_stateid *stp;
358 list_del(&sop->so_idhash);
359 list_del(&sop->so_strhash);
360 list_del(&sop->so_perstateid);
361 while (!list_empty(&sop->so_stateids)) {
362 stp = list_first_entry(&sop->so_stateids,
363 struct nfs4_stateid, st_perstateowner);
364 release_lock_stateid(stp);
368 static void release_lockowner(struct nfs4_stateowner *sop)
370 unhash_lockowner(sop);
371 nfs4_put_stateowner(sop);
375 release_stateid_lockowners(struct nfs4_stateid *open_stp)
377 struct nfs4_stateowner *lock_sop;
379 while (!list_empty(&open_stp->st_lockowners)) {
380 lock_sop = list_entry(open_stp->st_lockowners.next,
381 struct nfs4_stateowner, so_perstateid);
382 /* list_del(&open_stp->st_lockowners); */
383 BUG_ON(lock_sop->so_is_open_owner);
384 release_lockowner(lock_sop);
389 * We store the NONE, READ, WRITE, and BOTH bits separately in the
390 * st_{access,deny}_bmap field of the stateid, in order to track not
391 * only what share bits are currently in force, but also what
392 * combinations of share bits previous opens have used. This allows us
393 * to enforce the recommendation of rfc 3530 14.2.19 that the server
394 * return an error if the client attempt to downgrade to a combination
395 * of share bits not explicable by closing some of its previous opens.
397 * XXX: This enforcement is actually incomplete, since we don't keep
398 * track of access/deny bit combinations; so, e.g., we allow:
400 * OPEN allow read, deny write
401 * OPEN allow both, deny none
402 * DOWNGRADE allow read, deny none
404 * which we should reject.
407 set_access(unsigned int *access, unsigned long bmap) {
411 for (i = 1; i < 4; i++) {
412 if (test_bit(i, &bmap))
418 set_deny(unsigned int *deny, unsigned long bmap) {
422 for (i = 0; i < 4; i++) {
423 if (test_bit(i, &bmap))
429 test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
430 unsigned int access, deny;
432 set_access(&access, stp->st_access_bmap);
433 set_deny(&deny, stp->st_deny_bmap);
434 if ((access & open->op_share_deny) || (deny & open->op_share_access))
439 static int nfs4_access_to_omode(u32 access)
441 switch (access & NFS4_SHARE_ACCESS_BOTH) {
442 case NFS4_SHARE_ACCESS_READ:
444 case NFS4_SHARE_ACCESS_WRITE:
446 case NFS4_SHARE_ACCESS_BOTH:
452 static int nfs4_access_bmap_to_omode(struct nfs4_stateid *stp)
456 set_access(&access, stp->st_access_bmap);
457 return nfs4_access_to_omode(access);
460 static void release_open_stateid(struct nfs4_stateid *stp)
462 int oflag = nfs4_access_bmap_to_omode(stp);
464 unhash_generic_stateid(stp);
465 release_stateid_lockowners(stp);
466 nfs4_file_put_access(stp->st_file, oflag);
467 free_generic_stateid(stp);
470 static void unhash_openowner(struct nfs4_stateowner *sop)
472 struct nfs4_stateid *stp;
474 list_del(&sop->so_idhash);
475 list_del(&sop->so_strhash);
476 list_del(&sop->so_perclient);
477 list_del(&sop->so_perstateid); /* XXX: necessary? */
478 while (!list_empty(&sop->so_stateids)) {
479 stp = list_first_entry(&sop->so_stateids,
480 struct nfs4_stateid, st_perstateowner);
481 release_open_stateid(stp);
485 static void release_openowner(struct nfs4_stateowner *sop)
487 unhash_openowner(sop);
488 list_del(&sop->so_close_lru);
489 nfs4_put_stateowner(sop);
492 #define SESSION_HASH_SIZE 512
493 static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
496 hash_sessionid(struct nfs4_sessionid *sessionid)
498 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
500 return sid->sequence % SESSION_HASH_SIZE;
504 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
506 u32 *ptr = (u32 *)(&sessionid->data[0]);
507 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
511 gen_sessionid(struct nfsd4_session *ses)
513 struct nfs4_client *clp = ses->se_client;
514 struct nfsd4_sessionid *sid;
516 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
517 sid->clientid = clp->cl_clientid;
518 sid->sequence = current_sessionid++;
523 * The protocol defines ca_maxresponssize_cached to include the size of
524 * the rpc header, but all we need to cache is the data starting after
525 * the end of the initial SEQUENCE operation--the rest we regenerate
526 * each time. Therefore we can advertise a ca_maxresponssize_cached
527 * value that is the number of bytes in our cache plus a few additional
528 * bytes. In order to stay on the safe side, and not promise more than
529 * we can cache, those additional bytes must be the minimum possible: 24
530 * bytes of rpc header (xid through accept state, with AUTH_NULL
531 * verifier), 12 for the compound header (with zero-length tag), and 44
532 * for the SEQUENCE op response:
534 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
537 free_session_slots(struct nfsd4_session *ses)
541 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
542 kfree(ses->se_slots[i]);
546 * We don't actually need to cache the rpc and session headers, so we
547 * can allocate a little less for each slot:
549 static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
551 return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
554 static int nfsd4_sanitize_slot_size(u32 size)
556 size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
557 size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
563 * XXX: If we run out of reserved DRC memory we could (up to a point)
564 * re-negotiate active sessions and reduce their slot usage to make
565 * rooom for new connections. For now we just fail the create session.
567 static int nfsd4_get_drc_mem(int slotsize, u32 num)
571 num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
573 spin_lock(&nfsd_drc_lock);
574 avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
575 nfsd_drc_max_mem - nfsd_drc_mem_used);
576 num = min_t(int, num, avail / slotsize);
577 nfsd_drc_mem_used += num * slotsize;
578 spin_unlock(&nfsd_drc_lock);
583 static void nfsd4_put_drc_mem(int slotsize, int num)
585 spin_lock(&nfsd_drc_lock);
586 nfsd_drc_mem_used -= slotsize * num;
587 spin_unlock(&nfsd_drc_lock);
590 static struct nfsd4_session *alloc_session(int slotsize, int numslots)
592 struct nfsd4_session *new;
595 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
596 + sizeof(struct nfsd4_session) > PAGE_SIZE);
597 mem = numslots * sizeof(struct nfsd4_slot *);
599 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
602 /* allocate each struct nfsd4_slot and data cache in one piece */
603 for (i = 0; i < numslots; i++) {
604 mem = sizeof(struct nfsd4_slot) + slotsize;
605 new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
606 if (!new->se_slots[i])
612 kfree(new->se_slots[i]);
617 static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
619 u32 maxrpc = nfsd_serv->sv_max_mesg;
621 new->maxreqs = numslots;
622 new->maxresp_cached = slotsize + NFSD_MIN_HDR_SEQ_SZ;
623 new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
624 new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
625 new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
628 static void free_conn(struct nfsd4_conn *c)
630 svc_xprt_put(c->cn_xprt);
634 static void nfsd4_conn_lost(struct svc_xpt_user *u)
636 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
637 struct nfs4_client *clp = c->cn_session->se_client;
639 spin_lock(&clp->cl_lock);
640 if (!list_empty(&c->cn_persession)) {
641 list_del(&c->cn_persession);
644 spin_unlock(&clp->cl_lock);
647 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
649 struct nfsd4_conn *conn;
651 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
654 svc_xprt_get(rqstp->rq_xprt);
655 conn->cn_xprt = rqstp->rq_xprt;
656 conn->cn_flags = flags;
657 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
661 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
663 conn->cn_session = ses;
664 list_add(&conn->cn_persession, &ses->se_conns);
667 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
669 struct nfs4_client *clp = ses->se_client;
671 spin_lock(&clp->cl_lock);
672 __nfsd4_hash_conn(conn, ses);
673 spin_unlock(&clp->cl_lock);
676 static int nfsd4_register_conn(struct nfsd4_conn *conn)
678 conn->cn_xpt_user.callback = nfsd4_conn_lost;
679 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
682 static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses)
684 struct nfsd4_conn *conn;
685 u32 flags = NFS4_CDFC4_FORE;
688 if (ses->se_flags & SESSION4_BACK_CHAN)
689 flags |= NFS4_CDFC4_BACK;
690 conn = alloc_conn(rqstp, flags);
692 return nfserr_jukebox;
693 nfsd4_hash_conn(conn, ses);
694 ret = nfsd4_register_conn(conn);
696 /* oops; xprt is already down: */
697 nfsd4_conn_lost(&conn->cn_xpt_user);
701 static void nfsd4_del_conns(struct nfsd4_session *s)
703 struct nfs4_client *clp = s->se_client;
704 struct nfsd4_conn *c;
706 spin_lock(&clp->cl_lock);
707 while (!list_empty(&s->se_conns)) {
708 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
709 list_del_init(&c->cn_persession);
710 spin_unlock(&clp->cl_lock);
712 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
715 spin_lock(&clp->cl_lock);
717 spin_unlock(&clp->cl_lock);
720 void free_session(struct kref *kref)
722 struct nfsd4_session *ses;
725 ses = container_of(kref, struct nfsd4_session, se_ref);
726 nfsd4_del_conns(ses);
727 spin_lock(&nfsd_drc_lock);
728 mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
729 nfsd_drc_mem_used -= mem;
730 spin_unlock(&nfsd_drc_lock);
731 free_session_slots(ses);
735 static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
737 struct nfsd4_session *new;
738 struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
739 int numslots, slotsize;
744 * Note decreasing slot size below client's request may
745 * make it difficult for client to function correctly, whereas
746 * decreasing the number of slots will (just?) affect
747 * performance. When short on memory we therefore prefer to
748 * decrease number of slots instead of their size.
750 slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
751 numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
755 new = alloc_session(slotsize, numslots);
757 nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
760 init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
762 new->se_client = clp;
765 INIT_LIST_HEAD(&new->se_conns);
767 new->se_cb_seq_nr = 1;
768 new->se_flags = cses->flags;
769 new->se_cb_prog = cses->callback_prog;
770 kref_init(&new->se_ref);
771 idx = hash_sessionid(&new->se_sessionid);
772 spin_lock(&client_lock);
773 list_add(&new->se_hash, &sessionid_hashtbl[idx]);
774 spin_lock(&clp->cl_lock);
775 list_add(&new->se_perclnt, &clp->cl_sessions);
776 spin_unlock(&clp->cl_lock);
777 spin_unlock(&client_lock);
779 status = nfsd4_new_conn(rqstp, new);
780 /* whoops: benny points out, status is ignored! (err, or bogus) */
782 free_session(&new->se_ref);
785 if (!clp->cl_cb_session && (cses->flags & SESSION4_BACK_CHAN)) {
786 struct sockaddr *sa = svc_addr(rqstp);
788 clp->cl_cb_session = new;
789 clp->cl_cb_conn.cb_xprt = rqstp->rq_xprt;
790 svc_xprt_get(rqstp->rq_xprt);
791 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
792 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
793 nfsd4_probe_callback(clp);
798 /* caller must hold client_lock */
799 static struct nfsd4_session *
800 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
802 struct nfsd4_session *elem;
805 dump_sessionid(__func__, sessionid);
806 idx = hash_sessionid(sessionid);
807 /* Search in the appropriate list */
808 list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
809 if (!memcmp(elem->se_sessionid.data, sessionid->data,
810 NFS4_MAX_SESSIONID_LEN)) {
815 dprintk("%s: session not found\n", __func__);
819 /* caller must hold client_lock */
821 unhash_session(struct nfsd4_session *ses)
823 list_del(&ses->se_hash);
824 spin_lock(&ses->se_client->cl_lock);
825 list_del(&ses->se_perclnt);
826 spin_unlock(&ses->se_client->cl_lock);
829 /* must be called under the client_lock */
831 renew_client_locked(struct nfs4_client *clp)
833 if (is_client_expired(clp)) {
834 dprintk("%s: client (clientid %08x/%08x) already expired\n",
836 clp->cl_clientid.cl_boot,
837 clp->cl_clientid.cl_id);
842 * Move client to the end to the LRU list.
844 dprintk("renewing client (clientid %08x/%08x)\n",
845 clp->cl_clientid.cl_boot,
846 clp->cl_clientid.cl_id);
847 list_move_tail(&clp->cl_lru, &client_lru);
848 clp->cl_time = get_seconds();
852 renew_client(struct nfs4_client *clp)
854 spin_lock(&client_lock);
855 renew_client_locked(clp);
856 spin_unlock(&client_lock);
859 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
861 STALE_CLIENTID(clientid_t *clid)
863 if (clid->cl_boot == boot_time)
865 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
866 clid->cl_boot, clid->cl_id, boot_time);
871 * XXX Should we use a slab cache ?
872 * This type of memory management is somewhat inefficient, but we use it
873 * anyway since SETCLIENTID is not a common operation.
875 static struct nfs4_client *alloc_client(struct xdr_netobj name)
877 struct nfs4_client *clp;
879 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
882 clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
883 if (clp->cl_name.data == NULL) {
887 memcpy(clp->cl_name.data, name.data, name.len);
888 clp->cl_name.len = name.len;
893 free_client(struct nfs4_client *clp)
895 while (!list_empty(&clp->cl_sessions)) {
896 struct nfsd4_session *ses;
897 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
899 list_del(&ses->se_perclnt);
900 nfsd4_put_session(ses);
902 if (clp->cl_cred.cr_group_info)
903 put_group_info(clp->cl_cred.cr_group_info);
904 kfree(clp->cl_principal);
905 kfree(clp->cl_name.data);
910 release_session_client(struct nfsd4_session *session)
912 struct nfs4_client *clp = session->se_client;
914 if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
916 if (is_client_expired(clp)) {
918 session->se_client = NULL;
920 renew_client_locked(clp);
921 spin_unlock(&client_lock);
924 /* must be called under the client_lock */
926 unhash_client_locked(struct nfs4_client *clp)
928 struct nfsd4_session *ses;
930 mark_client_expired(clp);
931 list_del(&clp->cl_lru);
932 spin_lock(&clp->cl_lock);
933 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
934 list_del_init(&ses->se_hash);
935 spin_unlock(&clp->cl_lock);
939 expire_client(struct nfs4_client *clp)
941 struct nfs4_stateowner *sop;
942 struct nfs4_delegation *dp;
943 struct list_head reaplist;
945 INIT_LIST_HEAD(&reaplist);
946 spin_lock(&recall_lock);
947 while (!list_empty(&clp->cl_delegations)) {
948 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
949 dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
951 list_del_init(&dp->dl_perclnt);
952 list_move(&dp->dl_recall_lru, &reaplist);
954 spin_unlock(&recall_lock);
955 while (!list_empty(&reaplist)) {
956 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
957 list_del_init(&dp->dl_recall_lru);
958 unhash_delegation(dp);
960 while (!list_empty(&clp->cl_openowners)) {
961 sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
962 release_openowner(sop);
964 nfsd4_shutdown_callback(clp);
965 if (clp->cl_cb_conn.cb_xprt)
966 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
967 list_del(&clp->cl_idhash);
968 list_del(&clp->cl_strhash);
969 spin_lock(&client_lock);
970 unhash_client_locked(clp);
971 if (atomic_read(&clp->cl_refcount) == 0)
973 spin_unlock(&client_lock);
976 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
978 memcpy(target->cl_verifier.data, source->data,
979 sizeof(target->cl_verifier.data));
982 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
984 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
985 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
988 static void copy_cred(struct svc_cred *target, struct svc_cred *source)
990 target->cr_uid = source->cr_uid;
991 target->cr_gid = source->cr_gid;
992 target->cr_group_info = source->cr_group_info;
993 get_group_info(target->cr_group_info);
996 static int same_name(const char *n1, const char *n2)
998 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1002 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1004 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1008 same_clid(clientid_t *cl1, clientid_t *cl2)
1010 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1013 /* XXX what about NGROUP */
1015 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1017 return cr1->cr_uid == cr2->cr_uid;
1020 static void gen_clid(struct nfs4_client *clp)
1022 static u32 current_clientid = 1;
1024 clp->cl_clientid.cl_boot = boot_time;
1025 clp->cl_clientid.cl_id = current_clientid++;
1028 static void gen_confirm(struct nfs4_client *clp)
1033 p = (u32 *)clp->cl_confirm.data;
1034 *p++ = get_seconds();
1038 static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
1039 struct svc_rqst *rqstp, nfs4_verifier *verf)
1041 struct nfs4_client *clp;
1042 struct sockaddr *sa = svc_addr(rqstp);
1045 clp = alloc_client(name);
1049 INIT_LIST_HEAD(&clp->cl_sessions);
1051 princ = svc_gss_principal(rqstp);
1053 clp->cl_principal = kstrdup(princ, GFP_KERNEL);
1054 if (clp->cl_principal == NULL) {
1060 memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
1061 atomic_set(&clp->cl_refcount, 0);
1062 atomic_set(&clp->cl_cb_set, 0);
1063 INIT_LIST_HEAD(&clp->cl_idhash);
1064 INIT_LIST_HEAD(&clp->cl_strhash);
1065 INIT_LIST_HEAD(&clp->cl_openowners);
1066 INIT_LIST_HEAD(&clp->cl_delegations);
1067 INIT_LIST_HEAD(&clp->cl_lru);
1068 spin_lock_init(&clp->cl_lock);
1069 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
1070 clp->cl_time = get_seconds();
1071 clear_bit(0, &clp->cl_cb_slot_busy);
1072 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1073 copy_verf(clp, verf);
1074 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1075 clp->cl_flavor = rqstp->rq_flavor;
1076 copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1078 clp->cl_cb_session = NULL;
1082 static int check_name(struct xdr_netobj name)
1086 if (name.len > NFS4_OPAQUE_LIMIT) {
1087 dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
1094 add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
1096 unsigned int idhashval;
1098 list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
1099 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1100 list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
1105 move_to_confirmed(struct nfs4_client *clp)
1107 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1108 unsigned int strhashval;
1110 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1111 list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
1112 strhashval = clientstr_hashval(clp->cl_recdir);
1113 list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
1117 static struct nfs4_client *
1118 find_confirmed_client(clientid_t *clid)
1120 struct nfs4_client *clp;
1121 unsigned int idhashval = clientid_hashval(clid->cl_id);
1123 list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
1124 if (same_clid(&clp->cl_clientid, clid))
1130 static struct nfs4_client *
1131 find_unconfirmed_client(clientid_t *clid)
1133 struct nfs4_client *clp;
1134 unsigned int idhashval = clientid_hashval(clid->cl_id);
1136 list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
1137 if (same_clid(&clp->cl_clientid, clid))
1143 static bool clp_used_exchangeid(struct nfs4_client *clp)
1145 return clp->cl_exchange_flags != 0;
1148 static struct nfs4_client *
1149 find_confirmed_client_by_str(const char *dname, unsigned int hashval)
1151 struct nfs4_client *clp;
1153 list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
1154 if (same_name(clp->cl_recdir, dname))
1160 static struct nfs4_client *
1161 find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
1163 struct nfs4_client *clp;
1165 list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
1166 if (same_name(clp->cl_recdir, dname))
1172 static void rpc_svcaddr2sockaddr(struct sockaddr *sa, unsigned short family, union svc_addr_u *svcaddr)
1176 ((struct sockaddr_in *)sa)->sin_family = AF_INET;
1177 ((struct sockaddr_in *)sa)->sin_addr = svcaddr->addr;
1180 ((struct sockaddr_in6 *)sa)->sin6_family = AF_INET6;
1181 ((struct sockaddr_in6 *)sa)->sin6_addr = svcaddr->addr6;
1187 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
1189 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
1190 struct sockaddr *sa = svc_addr(rqstp);
1191 u32 scopeid = rpc_get_scope_id(sa);
1192 unsigned short expected_family;
1194 /* Currently, we only support tcp and tcp6 for the callback channel */
1195 if (se->se_callback_netid_len == 3 &&
1196 !memcmp(se->se_callback_netid_val, "tcp", 3))
1197 expected_family = AF_INET;
1198 else if (se->se_callback_netid_len == 4 &&
1199 !memcmp(se->se_callback_netid_val, "tcp6", 4))
1200 expected_family = AF_INET6;
1204 conn->cb_addrlen = rpc_uaddr2sockaddr(se->se_callback_addr_val,
1205 se->se_callback_addr_len,
1206 (struct sockaddr *)&conn->cb_addr,
1207 sizeof(conn->cb_addr));
1209 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
1212 if (conn->cb_addr.ss_family == AF_INET6)
1213 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
1215 conn->cb_prog = se->se_callback_prog;
1216 conn->cb_ident = se->se_callback_ident;
1217 rpc_svcaddr2sockaddr((struct sockaddr *)&conn->cb_saddr, expected_family, &rqstp->rq_daddr);
1220 conn->cb_addr.ss_family = AF_UNSPEC;
1221 conn->cb_addrlen = 0;
1222 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
1223 "will not receive delegations\n",
1224 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
1230 * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
1233 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
1235 struct nfsd4_slot *slot = resp->cstate.slot;
1238 dprintk("--> %s slot %p\n", __func__, slot);
1240 slot->sl_opcnt = resp->opcnt;
1241 slot->sl_status = resp->cstate.status;
1243 if (nfsd4_not_cached(resp)) {
1244 slot->sl_datalen = 0;
1247 slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
1248 base = (char *)resp->cstate.datap -
1249 (char *)resp->xbuf->head[0].iov_base;
1250 if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
1252 WARN("%s: sessions DRC could not cache compound\n", __func__);
1257 * Encode the replay sequence operation from the slot values.
1258 * If cachethis is FALSE encode the uncached rep error on the next
1259 * operation which sets resp->p and increments resp->opcnt for
1260 * nfs4svc_encode_compoundres.
1264 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
1265 struct nfsd4_compoundres *resp)
1267 struct nfsd4_op *op;
1268 struct nfsd4_slot *slot = resp->cstate.slot;
1270 dprintk("--> %s resp->opcnt %d cachethis %u \n", __func__,
1271 resp->opcnt, resp->cstate.slot->sl_cachethis);
1273 /* Encode the replayed sequence operation */
1274 op = &args->ops[resp->opcnt - 1];
1275 nfsd4_encode_operation(resp, op);
1277 /* Return nfserr_retry_uncached_rep in next operation. */
1278 if (args->opcnt > 1 && slot->sl_cachethis == 0) {
1279 op = &args->ops[resp->opcnt++];
1280 op->status = nfserr_retry_uncached_rep;
1281 nfsd4_encode_operation(resp, op);
1287 * The sequence operation is not cached because we can use the slot and
1291 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
1292 struct nfsd4_sequence *seq)
1294 struct nfsd4_slot *slot = resp->cstate.slot;
1297 dprintk("--> %s slot %p\n", __func__, slot);
1299 /* Either returns 0 or nfserr_retry_uncached */
1300 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
1301 if (status == nfserr_retry_uncached_rep)
1304 /* The sequence operation has been encoded, cstate->datap set. */
1305 memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
1307 resp->opcnt = slot->sl_opcnt;
1308 resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
1309 status = slot->sl_status;
1315 * Set the exchange_id flags returned by the server.
1318 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
1320 /* pNFS is not supported */
1321 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
1323 /* Referrals are supported, Migration is not. */
1324 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
1326 /* set the wire flags to return to client. */
1327 clid->flags = new->cl_exchange_flags;
1331 nfsd4_exchange_id(struct svc_rqst *rqstp,
1332 struct nfsd4_compound_state *cstate,
1333 struct nfsd4_exchange_id *exid)
1335 struct nfs4_client *unconf, *conf, *new;
1337 unsigned int strhashval;
1338 char dname[HEXDIR_LEN];
1339 char addr_str[INET6_ADDRSTRLEN];
1340 nfs4_verifier verf = exid->verifier;
1341 struct sockaddr *sa = svc_addr(rqstp);
1343 rpc_ntop(sa, addr_str, sizeof(addr_str));
1344 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
1345 "ip_addr=%s flags %x, spa_how %d\n",
1346 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
1347 addr_str, exid->flags, exid->spa_how);
1349 if (!check_name(exid->clname) || (exid->flags & ~EXCHGID4_FLAG_MASK_A))
1350 return nfserr_inval;
1352 /* Currently only support SP4_NONE */
1353 switch (exid->spa_how) {
1357 return nfserr_serverfault;
1359 BUG(); /* checked by xdr code */
1361 return nfserr_serverfault; /* no excuse :-/ */
1364 status = nfs4_make_rec_clidname(dname, &exid->clname);
1369 strhashval = clientstr_hashval(dname);
1374 conf = find_confirmed_client_by_str(dname, strhashval);
1376 if (!clp_used_exchangeid(conf)) {
1377 status = nfserr_clid_inuse; /* XXX: ? */
1380 if (!same_verf(&verf, &conf->cl_verifier)) {
1381 /* 18.35.4 case 8 */
1382 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1383 status = nfserr_not_same;
1386 /* Client reboot: destroy old state */
1387 expire_client(conf);
1390 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1391 /* 18.35.4 case 9 */
1392 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1393 status = nfserr_perm;
1396 expire_client(conf);
1400 * Set bit when the owner id and verifier map to an already
1401 * confirmed client id (18.35.3).
1403 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
1406 * Falling into 18.35.4 case 2, possible router replay.
1407 * Leave confirmed record intact and return same result.
1409 copy_verf(conf, &verf);
1414 /* 18.35.4 case 7 */
1415 if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
1416 status = nfserr_noent;
1420 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1423 * Possible retry or client restart. Per 18.35.4 case 4,
1424 * a new unconfirmed record should be generated regardless
1425 * of whether any properties have changed.
1427 expire_client(unconf);
1432 new = create_client(exid->clname, dname, rqstp, &verf);
1434 status = nfserr_jukebox;
1439 add_to_unconfirmed(new, strhashval);
1441 exid->clientid.cl_boot = new->cl_clientid.cl_boot;
1442 exid->clientid.cl_id = new->cl_clientid.cl_id;
1445 nfsd4_set_ex_flags(new, exid);
1447 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
1448 new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
1452 nfs4_unlock_state();
1454 dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
1459 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
1461 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
1464 /* The slot is in use, and no response has been sent. */
1466 if (seqid == slot_seqid)
1467 return nfserr_jukebox;
1469 return nfserr_seq_misordered;
1472 if (likely(seqid == slot_seqid + 1))
1475 if (seqid == slot_seqid)
1476 return nfserr_replay_cache;
1478 if (seqid == 1 && (slot_seqid + 1) == 0)
1480 /* Misordered replay or misordered new request */
1481 return nfserr_seq_misordered;
1485 * Cache the create session result into the create session single DRC
1486 * slot cache by saving the xdr structure. sl_seqid has been set.
1487 * Do this for solo or embedded create session operations.
1490 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
1491 struct nfsd4_clid_slot *slot, int nfserr)
1493 slot->sl_status = nfserr;
1494 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
1498 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
1499 struct nfsd4_clid_slot *slot)
1501 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
1502 return slot->sl_status;
1506 nfsd4_create_session(struct svc_rqst *rqstp,
1507 struct nfsd4_compound_state *cstate,
1508 struct nfsd4_create_session *cr_ses)
1510 struct sockaddr *sa = svc_addr(rqstp);
1511 struct nfs4_client *conf, *unconf;
1512 struct nfsd4_session *new;
1513 struct nfsd4_clid_slot *cs_slot = NULL;
1514 bool confirm_me = false;
1518 unconf = find_unconfirmed_client(&cr_ses->clientid);
1519 conf = find_confirmed_client(&cr_ses->clientid);
1522 cs_slot = &conf->cl_cs_slot;
1523 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1524 if (status == nfserr_replay_cache) {
1525 dprintk("Got a create_session replay! seqid= %d\n",
1527 /* Return the cached reply status */
1528 status = nfsd4_replay_create_session(cr_ses, cs_slot);
1530 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
1531 status = nfserr_seq_misordered;
1532 dprintk("Sequence misordered!\n");
1533 dprintk("Expected seqid= %d but got seqid= %d\n",
1534 cs_slot->sl_seqid, cr_ses->seqid);
1537 } else if (unconf) {
1538 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
1539 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
1540 status = nfserr_clid_inuse;
1544 cs_slot = &unconf->cl_cs_slot;
1545 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
1547 /* an unconfirmed replay returns misordered */
1548 status = nfserr_seq_misordered;
1555 status = nfserr_stale_clientid;
1560 * XXX: we should probably set this at creation time, and check
1561 * for consistent minorversion use throughout:
1563 conf->cl_minorversion = 1;
1565 * We do not support RDMA or persistent sessions
1567 cr_ses->flags &= ~SESSION4_PERSIST;
1568 cr_ses->flags &= ~SESSION4_RDMA;
1570 status = nfserr_jukebox;
1571 new = alloc_init_session(rqstp, conf, cr_ses);
1575 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
1576 NFS4_MAX_SESSIONID_LEN);
1577 memcpy(&cr_ses->fore_channel, &new->se_fchannel,
1578 sizeof(struct nfsd4_channel_attrs));
1579 cs_slot->sl_seqid++;
1580 cr_ses->seqid = cs_slot->sl_seqid;
1582 /* cache solo and embedded create sessions under the state lock */
1583 nfsd4_cache_create_session(cr_ses, cs_slot, status);
1585 move_to_confirmed(conf);
1587 nfs4_unlock_state();
1588 dprintk("%s returns %d\n", __func__, ntohl(status));
1592 static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
1594 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1595 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
1597 return argp->opcnt == resp->opcnt;
1600 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
1604 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
1608 nfsd4_destroy_session(struct svc_rqst *r,
1609 struct nfsd4_compound_state *cstate,
1610 struct nfsd4_destroy_session *sessionid)
1612 struct nfsd4_session *ses;
1613 u32 status = nfserr_badsession;
1616 * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
1617 * - Should we return nfserr_back_chan_busy if waiting for
1618 * callbacks on to-be-destroyed session?
1619 * - Do we need to clear any callback info from previous session?
1622 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
1623 if (!nfsd4_last_compound_op(r))
1624 return nfserr_not_only_op;
1626 dump_sessionid(__func__, &sessionid->sessionid);
1627 spin_lock(&client_lock);
1628 ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
1630 spin_unlock(&client_lock);
1634 unhash_session(ses);
1635 spin_unlock(&client_lock);
1638 /* wait for callbacks */
1639 nfsd4_shutdown_callback(ses->se_client);
1640 nfs4_unlock_state();
1642 nfsd4_del_conns(ses);
1644 nfsd4_put_session(ses);
1647 dprintk("%s returns %d\n", __func__, ntohl(status));
1651 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
1653 struct nfsd4_conn *c;
1655 list_for_each_entry(c, &s->se_conns, cn_persession) {
1656 if (c->cn_xprt == xpt) {
1663 static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
1665 struct nfs4_client *clp = ses->se_client;
1666 struct nfsd4_conn *c;
1669 spin_lock(&clp->cl_lock);
1670 c = __nfsd4_find_conn(new->cn_xprt, ses);
1672 spin_unlock(&clp->cl_lock);
1676 __nfsd4_hash_conn(new, ses);
1677 spin_unlock(&clp->cl_lock);
1678 ret = nfsd4_register_conn(new);
1680 /* oops; xprt is already down: */
1681 nfsd4_conn_lost(&new->cn_xpt_user);
1686 nfsd4_sequence(struct svc_rqst *rqstp,
1687 struct nfsd4_compound_state *cstate,
1688 struct nfsd4_sequence *seq)
1690 struct nfsd4_compoundres *resp = rqstp->rq_resp;
1691 struct nfsd4_session *session;
1692 struct nfsd4_slot *slot;
1693 struct nfsd4_conn *conn;
1696 if (resp->opcnt != 1)
1697 return nfserr_sequence_pos;
1700 * Will be either used or freed by nfsd4_sequence_check_conn
1703 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
1705 return nfserr_jukebox;
1707 spin_lock(&client_lock);
1708 status = nfserr_badsession;
1709 session = find_in_sessionid_hashtbl(&seq->sessionid);
1713 status = nfserr_badslot;
1714 if (seq->slotid >= session->se_fchannel.maxreqs)
1717 slot = session->se_slots[seq->slotid];
1718 dprintk("%s: slotid %d\n", __func__, seq->slotid);
1720 /* We do not negotiate the number of slots yet, so set the
1721 * maxslots to the session maxreqs which is used to encode
1722 * sr_highest_slotid and the sr_target_slot id to maxslots */
1723 seq->maxslots = session->se_fchannel.maxreqs;
1725 status = check_slot_seqid(seq->seqid, slot->sl_seqid, slot->sl_inuse);
1726 if (status == nfserr_replay_cache) {
1727 cstate->slot = slot;
1728 cstate->session = session;
1729 /* Return the cached reply status and set cstate->status
1730 * for nfsd4_proc_compound processing */
1731 status = nfsd4_replay_cache_entry(resp, seq);
1732 cstate->status = nfserr_replay_cache;
1738 nfsd4_sequence_check_conn(conn, session);
1741 /* Success! bump slot seqid */
1742 slot->sl_inuse = true;
1743 slot->sl_seqid = seq->seqid;
1744 slot->sl_cachethis = seq->cachethis;
1746 cstate->slot = slot;
1747 cstate->session = session;
1750 /* Hold a session reference until done processing the compound. */
1751 if (cstate->session) {
1752 nfsd4_get_session(cstate->session);
1753 atomic_inc(&session->se_client->cl_refcount);
1756 spin_unlock(&client_lock);
1757 dprintk("%s: return %d\n", __func__, ntohl(status));
1762 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
1764 if (rc->rca_one_fs) {
1765 if (!cstate->current_fh.fh_dentry)
1766 return nfserr_nofilehandle;
1768 * We don't take advantage of the rca_one_fs case.
1769 * That's OK, it's optional, we can safely ignore it.
1774 if (is_client_expired(cstate->session->se_client)) {
1775 nfs4_unlock_state();
1777 * The following error isn't really legal.
1778 * But we only get here if the client just explicitly
1779 * destroyed the client. Surely it no longer cares what
1780 * error it gets back on an operation for the dead
1783 return nfserr_stale_clientid;
1785 nfsd4_create_clid_dir(cstate->session->se_client);
1786 nfs4_unlock_state();
1791 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
1792 struct nfsd4_setclientid *setclid)
1794 struct xdr_netobj clname = {
1795 .len = setclid->se_namelen,
1796 .data = setclid->se_name,
1798 nfs4_verifier clverifier = setclid->se_verf;
1799 unsigned int strhashval;
1800 struct nfs4_client *conf, *unconf, *new;
1802 char dname[HEXDIR_LEN];
1804 if (!check_name(clname))
1805 return nfserr_inval;
1807 status = nfs4_make_rec_clidname(dname, &clname);
1812 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1813 * We get here on a DRC miss.
1816 strhashval = clientstr_hashval(dname);
1819 conf = find_confirmed_client_by_str(dname, strhashval);
1821 /* RFC 3530 14.2.33 CASE 0: */
1822 status = nfserr_clid_inuse;
1823 if (clp_used_exchangeid(conf))
1825 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
1826 char addr_str[INET6_ADDRSTRLEN];
1827 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
1829 dprintk("NFSD: setclientid: string in use by client "
1830 "at %s\n", addr_str);
1835 * section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
1836 * has a description of SETCLIENTID request processing consisting
1837 * of 5 bullet points, labeled as CASE0 - CASE4 below.
1839 unconf = find_unconfirmed_client_by_str(dname, strhashval);
1840 status = nfserr_resource;
1843 * RFC 3530 14.2.33 CASE 4:
1844 * placed first, because it is the normal case
1847 expire_client(unconf);
1848 new = create_client(clname, dname, rqstp, &clverifier);
1852 } else if (same_verf(&conf->cl_verifier, &clverifier)) {
1854 * RFC 3530 14.2.33 CASE 1:
1855 * probable callback update
1858 /* Note this is removing unconfirmed {*x***},
1859 * which is stronger than RFC recommended {vxc**}.
1860 * This has the advantage that there is at most
1861 * one {*x***} in either list at any time.
1863 expire_client(unconf);
1865 new = create_client(clname, dname, rqstp, &clverifier);
1868 copy_clid(new, conf);
1869 } else if (!unconf) {
1871 * RFC 3530 14.2.33 CASE 2:
1872 * probable client reboot; state will be removed if
1875 new = create_client(clname, dname, rqstp, &clverifier);
1881 * RFC 3530 14.2.33 CASE 3:
1882 * probable client reboot; state will be removed if
1885 expire_client(unconf);
1886 new = create_client(clname, dname, rqstp, &clverifier);
1892 * XXX: we should probably set this at creation time, and check
1893 * for consistent minorversion use throughout:
1895 new->cl_minorversion = 0;
1896 gen_callback(new, setclid, rqstp);
1897 add_to_unconfirmed(new, strhashval);
1898 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
1899 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
1900 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
1903 nfs4_unlock_state();
1909 * Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
1910 * a description of SETCLIENTID_CONFIRM request processing consisting of 4
1911 * bullets, labeled as CASE1 - CASE4 below.
1914 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
1915 struct nfsd4_compound_state *cstate,
1916 struct nfsd4_setclientid_confirm *setclientid_confirm)
1918 struct sockaddr *sa = svc_addr(rqstp);
1919 struct nfs4_client *conf, *unconf;
1920 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
1921 clientid_t * clid = &setclientid_confirm->sc_clientid;
1924 if (STALE_CLIENTID(clid))
1925 return nfserr_stale_clientid;
1927 * XXX The Duplicate Request Cache (DRC) has been checked (??)
1928 * We get here on a DRC miss.
1933 conf = find_confirmed_client(clid);
1934 unconf = find_unconfirmed_client(clid);
1936 status = nfserr_clid_inuse;
1937 if (conf && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
1939 if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
1943 * section 14.2.34 of RFC 3530 has a description of
1944 * SETCLIENTID_CONFIRM request processing consisting
1945 * of 4 bullet points, labeled as CASE1 - CASE4 below.
1947 if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
1949 * RFC 3530 14.2.34 CASE 1:
1952 if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
1953 status = nfserr_clid_inuse;
1955 atomic_set(&conf->cl_cb_set, 0);
1956 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
1957 nfsd4_probe_callback(conf);
1958 expire_client(unconf);
1962 } else if (conf && !unconf) {
1964 * RFC 3530 14.2.34 CASE 2:
1965 * probable retransmitted request; play it safe and
1968 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
1969 status = nfserr_clid_inuse;
1972 } else if (!conf && unconf
1973 && same_verf(&unconf->cl_confirm, &confirm)) {
1975 * RFC 3530 14.2.34 CASE 3:
1976 * Normal case; new or rebooted client:
1978 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
1979 status = nfserr_clid_inuse;
1982 clientstr_hashval(unconf->cl_recdir);
1983 conf = find_confirmed_client_by_str(unconf->cl_recdir,
1986 nfsd4_remove_clid_dir(conf);
1987 expire_client(conf);
1989 move_to_confirmed(unconf);
1991 nfsd4_probe_callback(conf);
1994 } else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
1995 && (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
1998 * RFC 3530 14.2.34 CASE 4:
1999 * Client probably hasn't noticed that we rebooted yet.
2001 status = nfserr_stale_clientid;
2003 /* check that we have hit one of the cases...*/
2004 status = nfserr_clid_inuse;
2007 nfs4_unlock_state();
2011 /* OPEN Share state helper functions */
2012 static inline struct nfs4_file *
2013 alloc_init_file(struct inode *ino)
2015 struct nfs4_file *fp;
2016 unsigned int hashval = file_hashval(ino);
2018 fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
2020 atomic_set(&fp->fi_ref, 1);
2021 INIT_LIST_HEAD(&fp->fi_hash);
2022 INIT_LIST_HEAD(&fp->fi_stateids);
2023 INIT_LIST_HEAD(&fp->fi_delegations);
2024 fp->fi_inode = igrab(ino);
2025 fp->fi_id = current_fileid++;
2026 fp->fi_had_conflict = false;
2027 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
2028 memset(fp->fi_access, 0, sizeof(fp->fi_access));
2029 spin_lock(&recall_lock);
2030 list_add(&fp->fi_hash, &file_hashtbl[hashval]);
2031 spin_unlock(&recall_lock);
2038 nfsd4_free_slab(struct kmem_cache **slab)
2042 kmem_cache_destroy(*slab);
2047 nfsd4_free_slabs(void)
2049 nfsd4_free_slab(&stateowner_slab);
2050 nfsd4_free_slab(&file_slab);
2051 nfsd4_free_slab(&stateid_slab);
2052 nfsd4_free_slab(&deleg_slab);
2056 nfsd4_init_slabs(void)
2058 stateowner_slab = kmem_cache_create("nfsd4_stateowners",
2059 sizeof(struct nfs4_stateowner), 0, 0, NULL);
2060 if (stateowner_slab == NULL)
2062 file_slab = kmem_cache_create("nfsd4_files",
2063 sizeof(struct nfs4_file), 0, 0, NULL);
2064 if (file_slab == NULL)
2066 stateid_slab = kmem_cache_create("nfsd4_stateids",
2067 sizeof(struct nfs4_stateid), 0, 0, NULL);
2068 if (stateid_slab == NULL)
2070 deleg_slab = kmem_cache_create("nfsd4_delegations",
2071 sizeof(struct nfs4_delegation), 0, 0, NULL);
2072 if (deleg_slab == NULL)
2077 dprintk("nfsd4: out of memory while initializing nfsv4\n");
2082 nfs4_free_stateowner(struct kref *kref)
2084 struct nfs4_stateowner *sop =
2085 container_of(kref, struct nfs4_stateowner, so_ref);
2086 kfree(sop->so_owner.data);
2087 kmem_cache_free(stateowner_slab, sop);
2090 static inline struct nfs4_stateowner *
2091 alloc_stateowner(struct xdr_netobj *owner)
2093 struct nfs4_stateowner *sop;
2095 if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
2096 if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
2097 memcpy(sop->so_owner.data, owner->data, owner->len);
2098 sop->so_owner.len = owner->len;
2099 kref_init(&sop->so_ref);
2102 kmem_cache_free(stateowner_slab, sop);
2107 static struct nfs4_stateowner *
2108 alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
2109 struct nfs4_stateowner *sop;
2110 struct nfs4_replay *rp;
2111 unsigned int idhashval;
2113 if (!(sop = alloc_stateowner(&open->op_owner)))
2115 idhashval = ownerid_hashval(current_ownerid);
2116 INIT_LIST_HEAD(&sop->so_idhash);
2117 INIT_LIST_HEAD(&sop->so_strhash);
2118 INIT_LIST_HEAD(&sop->so_perclient);
2119 INIT_LIST_HEAD(&sop->so_stateids);
2120 INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
2121 INIT_LIST_HEAD(&sop->so_close_lru);
2123 list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
2124 list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
2125 list_add(&sop->so_perclient, &clp->cl_openowners);
2126 sop->so_is_open_owner = 1;
2127 sop->so_id = current_ownerid++;
2128 sop->so_client = clp;
2129 sop->so_seqid = open->op_seqid;
2130 sop->so_confirmed = 0;
2131 rp = &sop->so_replay;
2132 rp->rp_status = nfserr_serverfault;
2134 rp->rp_buf = rp->rp_ibuf;
2139 init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
2140 struct nfs4_stateowner *sop = open->op_stateowner;
2141 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
2143 INIT_LIST_HEAD(&stp->st_hash);
2144 INIT_LIST_HEAD(&stp->st_perstateowner);
2145 INIT_LIST_HEAD(&stp->st_lockowners);
2146 INIT_LIST_HEAD(&stp->st_perfile);
2147 list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
2148 list_add(&stp->st_perstateowner, &sop->so_stateids);
2149 list_add(&stp->st_perfile, &fp->fi_stateids);
2150 stp->st_stateowner = sop;
2153 stp->st_stateid.si_boot = boot_time;
2154 stp->st_stateid.si_stateownerid = sop->so_id;
2155 stp->st_stateid.si_fileid = fp->fi_id;
2156 stp->st_stateid.si_generation = 0;
2157 stp->st_access_bmap = 0;
2158 stp->st_deny_bmap = 0;
2159 __set_bit(open->op_share_access & ~NFS4_SHARE_WANT_MASK,
2160 &stp->st_access_bmap);
2161 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2162 stp->st_openstp = NULL;
2166 move_to_close_lru(struct nfs4_stateowner *sop)
2168 dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
2170 list_move_tail(&sop->so_close_lru, &close_lru);
2171 sop->so_time = get_seconds();
2175 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
2178 return (sop->so_owner.len == owner->len) &&
2179 0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
2180 (sop->so_client->cl_clientid.cl_id == clid->cl_id);
2183 static struct nfs4_stateowner *
2184 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
2186 struct nfs4_stateowner *so = NULL;
2188 list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
2189 if (same_owner_str(so, &open->op_owner, &open->op_clientid))
2195 /* search file_hashtbl[] for file */
2196 static struct nfs4_file *
2197 find_file(struct inode *ino)
2199 unsigned int hashval = file_hashval(ino);
2200 struct nfs4_file *fp;
2202 spin_lock(&recall_lock);
2203 list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
2204 if (fp->fi_inode == ino) {
2206 spin_unlock(&recall_lock);
2210 spin_unlock(&recall_lock);
2214 static inline int access_valid(u32 x, u32 minorversion)
2216 if ((x & NFS4_SHARE_ACCESS_MASK) < NFS4_SHARE_ACCESS_READ)
2218 if ((x & NFS4_SHARE_ACCESS_MASK) > NFS4_SHARE_ACCESS_BOTH)
2220 x &= ~NFS4_SHARE_ACCESS_MASK;
2221 if (minorversion && x) {
2222 if ((x & NFS4_SHARE_WANT_MASK) > NFS4_SHARE_WANT_CANCEL)
2224 if ((x & NFS4_SHARE_WHEN_MASK) > NFS4_SHARE_PUSH_DELEG_WHEN_UNCONTENDED)
2226 x &= ~(NFS4_SHARE_WANT_MASK | NFS4_SHARE_WHEN_MASK);
2233 static inline int deny_valid(u32 x)
2235 /* Note: unlike access bits, deny bits may be zero. */
2236 return x <= NFS4_SHARE_DENY_BOTH;
2240 * Called to check deny when READ with all zero stateid or
2241 * WRITE with all zero or all one stateid
2244 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
2246 struct inode *ino = current_fh->fh_dentry->d_inode;
2247 struct nfs4_file *fp;
2248 struct nfs4_stateid *stp;
2251 dprintk("NFSD: nfs4_share_conflict\n");
2253 fp = find_file(ino);
2256 ret = nfserr_locked;
2257 /* Search for conflicting share reservations */
2258 list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
2259 if (test_bit(deny_type, &stp->st_deny_bmap) ||
2260 test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
2270 nfs4_file_downgrade(struct nfs4_file *fp, unsigned int share_access)
2272 if (share_access & NFS4_SHARE_ACCESS_WRITE)
2273 nfs4_file_put_access(fp, O_WRONLY);
2274 if (share_access & NFS4_SHARE_ACCESS_READ)
2275 nfs4_file_put_access(fp, O_RDONLY);
2279 * Spawn a thread to perform a recall on the delegation represented
2280 * by the lease (file_lock)
2282 * Called from break_lease() with lock_flocks() held.
2283 * Note: we assume break_lease will only call this *once* for any given
2287 void nfsd_break_deleg_cb(struct file_lock *fl)
2289 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
2291 dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
2295 /* We're assuming the state code never drops its reference
2296 * without first removing the lease. Since we're in this lease
2297 * callback (and since the lease code is serialized by the kernel
2298 * lock) we know the server hasn't removed the lease yet, we know
2299 * it's safe to take a reference: */
2300 atomic_inc(&dp->dl_count);
2302 spin_lock(&recall_lock);
2303 list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
2304 spin_unlock(&recall_lock);
2306 /* only place dl_time is set. protected by lock_flocks*/
2307 dp->dl_time = get_seconds();
2310 * We don't want the locks code to timeout the lease for us;
2311 * we'll remove it ourself if the delegation isn't returned
2314 fl->fl_break_time = 0;
2316 dp->dl_file->fi_had_conflict = true;
2317 nfsd4_cb_recall(dp);
2321 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
2324 return lease_modify(onlist, arg);
2329 static const struct lock_manager_operations nfsd_lease_mng_ops = {
2330 .fl_break = nfsd_break_deleg_cb,
2331 .fl_change = nfsd_change_deleg_cb,
2336 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
2337 struct nfsd4_open *open)
2339 clientid_t *clientid = &open->op_clientid;
2340 struct nfs4_client *clp = NULL;
2341 unsigned int strhashval;
2342 struct nfs4_stateowner *sop = NULL;
2344 if (!check_name(open->op_owner))
2345 return nfserr_inval;
2347 if (STALE_CLIENTID(&open->op_clientid))
2348 return nfserr_stale_clientid;
2350 strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
2351 sop = find_openstateowner_str(strhashval, open);
2352 open->op_stateowner = sop;
2354 /* Make sure the client's lease hasn't expired. */
2355 clp = find_confirmed_client(clientid);
2357 return nfserr_expired;
2360 /* When sessions are used, skip open sequenceid processing */
2361 if (nfsd4_has_session(cstate))
2363 if (!sop->so_confirmed) {
2364 /* Replace unconfirmed owners without checking for replay. */
2365 clp = sop->so_client;
2366 release_openowner(sop);
2367 open->op_stateowner = NULL;
2370 if (open->op_seqid == sop->so_seqid - 1) {
2371 if (sop->so_replay.rp_buflen)
2372 return nfserr_replay_me;
2373 /* The original OPEN failed so spectacularly
2374 * that we don't even have replay data saved!
2375 * Therefore, we have no choice but to continue
2376 * processing this OPEN; presumably, we'll
2377 * fail again for the same reason.
2379 dprintk("nfsd4_process_open1: replay with no replay cache\n");
2382 if (open->op_seqid != sop->so_seqid)
2383 return nfserr_bad_seqid;
2385 if (open->op_stateowner == NULL) {
2386 sop = alloc_init_open_stateowner(strhashval, clp, open);
2388 return nfserr_resource;
2389 open->op_stateowner = sop;
2391 list_del_init(&sop->so_close_lru);
2392 renew_client(sop->so_client);
2396 static inline __be32
2397 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
2399 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
2400 return nfserr_openmode;
2405 static struct nfs4_delegation *
2406 find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
2408 struct nfs4_delegation *dp;
2410 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
2411 if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
2417 int share_access_to_flags(u32 share_access)
2419 share_access &= ~NFS4_SHARE_WANT_MASK;
2421 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
2425 nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
2426 struct nfs4_delegation **dp)
2429 __be32 status = nfserr_bad_stateid;
2431 *dp = find_delegation_file(fp, &open->op_delegate_stateid);
2434 flags = share_access_to_flags(open->op_share_access);
2435 status = nfs4_check_delegmode(*dp, flags);
2439 if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
2443 open->op_stateowner->so_confirmed = 1;
2448 nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
2450 struct nfs4_stateid *local;
2451 __be32 status = nfserr_share_denied;
2452 struct nfs4_stateowner *sop = open->op_stateowner;
2454 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
2455 /* ignore lock owners */
2456 if (local->st_stateowner->so_is_open_owner == 0)
2458 /* remember if we have seen this open owner */
2459 if (local->st_stateowner == sop)
2461 /* check for conflicting share reservations */
2462 if (!test_share(local, open))
2470 static inline struct nfs4_stateid *
2471 nfs4_alloc_stateid(void)
2473 return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
2476 static inline int nfs4_access_to_access(u32 nfs4_access)
2480 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
2481 flags |= NFSD_MAY_READ;
2482 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
2483 flags |= NFSD_MAY_WRITE;
2487 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file
2488 *fp, struct svc_fh *cur_fh, u32 nfs4_access)
2491 int oflag = nfs4_access_to_omode(nfs4_access);
2492 int access = nfs4_access_to_access(nfs4_access);
2494 if (!fp->fi_fds[oflag]) {
2495 status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
2496 &fp->fi_fds[oflag]);
2500 nfs4_file_get_access(fp, oflag);
2506 nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
2507 struct nfs4_file *fp, struct svc_fh *cur_fh,
2508 struct nfsd4_open *open)
2510 struct nfs4_stateid *stp;
2513 stp = nfs4_alloc_stateid();
2515 return nfserr_resource;
2517 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open->op_share_access);
2519 kmem_cache_free(stateid_slab, stp);
2526 static inline __be32
2527 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
2528 struct nfsd4_open *open)
2530 struct iattr iattr = {
2531 .ia_valid = ATTR_SIZE,
2534 if (!open->op_truncate)
2536 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
2537 return nfserr_inval;
2538 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
2542 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
2544 u32 op_share_access = open->op_share_access & ~NFS4_SHARE_WANT_MASK;
2548 new_access = !test_bit(op_share_access, &stp->st_access_bmap);
2550 status = nfs4_get_vfs_file(rqstp, fp, cur_fh, op_share_access);
2554 status = nfsd4_truncate(rqstp, cur_fh, open);
2557 int oflag = nfs4_access_to_omode(new_access);
2558 nfs4_file_put_access(fp, oflag);
2562 /* remember the open */
2563 __set_bit(op_share_access, &stp->st_access_bmap);
2564 __set_bit(open->op_share_deny, &stp->st_deny_bmap);
2571 nfs4_set_claim_prev(struct nfsd4_open *open)
2573 open->op_stateowner->so_confirmed = 1;
2574 open->op_stateowner->so_client->cl_firststate = 1;
2578 * Attempt to hand out a delegation.
2581 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
2583 struct nfs4_delegation *dp;
2584 struct nfs4_stateowner *sop = stp->st_stateowner;
2585 int cb_up = atomic_read(&sop->so_client->cl_cb_set);
2586 struct file_lock *fl;
2587 int status, flag = 0;
2589 flag = NFS4_OPEN_DELEGATE_NONE;
2590 open->op_recall = 0;
2591 switch (open->op_claim_type) {
2592 case NFS4_OPEN_CLAIM_PREVIOUS:
2594 open->op_recall = 1;
2595 flag = open->op_delegate_type;
2596 if (flag == NFS4_OPEN_DELEGATE_NONE)
2599 case NFS4_OPEN_CLAIM_NULL:
2600 /* Let's not give out any delegations till everyone's
2601 * had the chance to reclaim theirs.... */
2602 if (locks_in_grace())
2604 if (!cb_up || !sop->so_confirmed)
2606 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
2607 flag = NFS4_OPEN_DELEGATE_WRITE;
2609 flag = NFS4_OPEN_DELEGATE_READ;
2615 dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
2617 flag = NFS4_OPEN_DELEGATE_NONE;
2621 fl = locks_alloc_lock();
2624 locks_init_lock(fl);
2625 fl->fl_lmops = &nfsd_lease_mng_ops;
2626 fl->fl_flags = FL_LEASE;
2627 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
2628 fl->fl_end = OFFSET_MAX;
2629 fl->fl_owner = (fl_owner_t)dp;
2630 fl->fl_file = find_readable_file(stp->st_file);
2631 BUG_ON(!fl->fl_file);
2632 fl->fl_pid = current->tgid;
2635 /* vfs_setlease checks to see if delegation should be handed out.
2636 * the lock_manager callback fl_change is used
2638 if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) {
2639 dprintk("NFSD: setlease failed [%d], no delegation\n", status);
2640 dp->dl_flock = NULL;
2641 locks_free_lock(fl);
2642 unhash_delegation(dp);
2643 flag = NFS4_OPEN_DELEGATE_NONE;
2647 memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
2649 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
2650 STATEID_VAL(&dp->dl_stateid));
2652 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
2653 && flag == NFS4_OPEN_DELEGATE_NONE
2654 && open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
2655 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
2656 open->op_delegate_type = flag;
2660 * called with nfs4_lock_state() held.
2663 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
2665 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2666 struct nfs4_file *fp = NULL;
2667 struct inode *ino = current_fh->fh_dentry->d_inode;
2668 struct nfs4_stateid *stp = NULL;
2669 struct nfs4_delegation *dp = NULL;
2672 status = nfserr_inval;
2673 if (!access_valid(open->op_share_access, resp->cstate.minorversion)
2674 || !deny_valid(open->op_share_deny))
2677 * Lookup file; if found, lookup stateid and check open request,
2678 * and check for delegations in the process of being recalled.
2679 * If not found, create the nfs4_file struct
2681 fp = find_file(ino);
2683 if ((status = nfs4_check_open(fp, open, &stp)))
2685 status = nfs4_check_deleg(fp, open, &dp);
2689 status = nfserr_bad_stateid;
2690 if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
2692 status = nfserr_resource;
2693 fp = alloc_init_file(ino);
2699 * OPEN the file, or upgrade an existing OPEN.
2700 * If truncate fails, the OPEN fails.
2703 /* Stateid was found, this is an OPEN upgrade */
2704 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
2707 update_stateid(&stp->st_stateid);
2709 status = nfs4_new_open(rqstp, &stp, fp, current_fh, open);
2712 init_stateid(stp, fp, open);
2713 status = nfsd4_truncate(rqstp, current_fh, open);
2715 release_open_stateid(stp);
2718 if (nfsd4_has_session(&resp->cstate))
2719 update_stateid(&stp->st_stateid);
2721 memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
2723 if (nfsd4_has_session(&resp->cstate))
2724 open->op_stateowner->so_confirmed = 1;
2727 * Attempt to hand out a delegation. No error return, because the
2728 * OPEN succeeds even if we fail.
2730 nfs4_open_delegation(current_fh, open, stp);
2734 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
2735 STATEID_VAL(&stp->st_stateid));
2739 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
2740 nfs4_set_claim_prev(open);
2742 * To finish the open response, we just need to set the rflags.
2744 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
2745 if (!open->op_stateowner->so_confirmed &&
2746 !nfsd4_has_session(&resp->cstate))
2747 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
2753 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2756 struct nfs4_client *clp;
2760 dprintk("process_renew(%08x/%08x): starting\n",
2761 clid->cl_boot, clid->cl_id);
2762 status = nfserr_stale_clientid;
2763 if (STALE_CLIENTID(clid))
2765 clp = find_confirmed_client(clid);
2766 status = nfserr_expired;
2768 /* We assume the client took too long to RENEW. */
2769 dprintk("nfsd4_renew: clientid not found!\n");
2773 status = nfserr_cb_path_down;
2774 if (!list_empty(&clp->cl_delegations)
2775 && !atomic_read(&clp->cl_cb_set))
2779 nfs4_unlock_state();
2783 struct lock_manager nfsd4_manager = {
2787 nfsd4_end_grace(void)
2789 dprintk("NFSD: end of grace period\n");
2790 nfsd4_recdir_purge_old();
2791 locks_end_grace(&nfsd4_manager);
2793 * Now that every NFSv4 client has had the chance to recover and
2794 * to see the (possibly new, possibly shorter) lease time, we
2795 * can safely set the next grace time to the current lease time:
2797 nfsd4_grace = nfsd4_lease;
2801 nfs4_laundromat(void)
2803 struct nfs4_client *clp;
2804 struct nfs4_stateowner *sop;
2805 struct nfs4_delegation *dp;
2806 struct list_head *pos, *next, reaplist;
2807 time_t cutoff = get_seconds() - nfsd4_lease;
2808 time_t t, clientid_val = nfsd4_lease;
2809 time_t u, test_val = nfsd4_lease;
2813 dprintk("NFSD: laundromat service - starting\n");
2814 if (locks_in_grace())
2816 INIT_LIST_HEAD(&reaplist);
2817 spin_lock(&client_lock);
2818 list_for_each_safe(pos, next, &client_lru) {
2819 clp = list_entry(pos, struct nfs4_client, cl_lru);
2820 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
2821 t = clp->cl_time - cutoff;
2822 if (clientid_val > t)
2826 if (atomic_read(&clp->cl_refcount)) {
2827 dprintk("NFSD: client in use (clientid %08x)\n",
2828 clp->cl_clientid.cl_id);
2831 unhash_client_locked(clp);
2832 list_add(&clp->cl_lru, &reaplist);
2834 spin_unlock(&client_lock);
2835 list_for_each_safe(pos, next, &reaplist) {
2836 clp = list_entry(pos, struct nfs4_client, cl_lru);
2837 dprintk("NFSD: purging unused client (clientid %08x)\n",
2838 clp->cl_clientid.cl_id);
2839 nfsd4_remove_clid_dir(clp);
2842 spin_lock(&recall_lock);
2843 list_for_each_safe(pos, next, &del_recall_lru) {
2844 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2845 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
2846 u = dp->dl_time - cutoff;
2851 dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
2853 list_move(&dp->dl_recall_lru, &reaplist);
2855 spin_unlock(&recall_lock);
2856 list_for_each_safe(pos, next, &reaplist) {
2857 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
2858 list_del_init(&dp->dl_recall_lru);
2859 unhash_delegation(dp);
2861 test_val = nfsd4_lease;
2862 list_for_each_safe(pos, next, &close_lru) {
2863 sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
2864 if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
2865 u = sop->so_time - cutoff;
2870 dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
2872 release_openowner(sop);
2874 if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
2875 clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
2876 nfs4_unlock_state();
2877 return clientid_val;
2880 static struct workqueue_struct *laundry_wq;
2881 static void laundromat_main(struct work_struct *);
2882 static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
2885 laundromat_main(struct work_struct *not_used)
2889 t = nfs4_laundromat();
2890 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
2891 queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
2894 static struct nfs4_stateowner *
2895 search_close_lru(u32 st_id, int flags)
2897 struct nfs4_stateowner *local = NULL;
2899 if (flags & CLOSE_STATE) {
2900 list_for_each_entry(local, &close_lru, so_close_lru) {
2901 if (local->so_id == st_id)
2909 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
2911 return fhp->fh_dentry->d_inode != stp->st_file->fi_inode;
2915 STALE_STATEID(stateid_t *stateid)
2917 if (stateid->si_boot == boot_time)
2919 dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
2920 STATEID_VAL(stateid));
2925 access_permit_read(unsigned long access_bmap)
2927 return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
2928 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
2929 test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
2933 access_permit_write(unsigned long access_bmap)
2935 return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
2936 test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
2940 __be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
2942 __be32 status = nfserr_openmode;
2944 /* For lock stateid's, we test the parent open, not the lock: */
2945 if (stp->st_openstp)
2946 stp = stp->st_openstp;
2947 if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
2949 if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
2956 static inline __be32
2957 check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
2959 if (ONE_STATEID(stateid) && (flags & RD_STATE))
2961 else if (locks_in_grace()) {
2962 /* Answer in remaining cases depends on existance of
2963 * conflicting state; so we must wait out the grace period. */
2964 return nfserr_grace;
2965 } else if (flags & WR_STATE)
2966 return nfs4_share_conflict(current_fh,
2967 NFS4_SHARE_DENY_WRITE);
2968 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
2969 return nfs4_share_conflict(current_fh,
2970 NFS4_SHARE_DENY_READ);
2974 * Allow READ/WRITE during grace period on recovered state only for files
2975 * that are not able to provide mandatory locking.
2978 grace_disallows_io(struct inode *inode)
2980 return locks_in_grace() && mandatory_lock(inode);
2983 static int check_stateid_generation(stateid_t *in, stateid_t *ref, int flags)
2986 * When sessions are used the stateid generation number is ignored
2989 if ((flags & HAS_SESSION) && in->si_generation == 0)
2992 /* If the client sends us a stateid from the future, it's buggy: */
2993 if (in->si_generation > ref->si_generation)
2994 return nfserr_bad_stateid;
2996 * The following, however, can happen. For example, if the
2997 * client sends an open and some IO at the same time, the open
2998 * may bump si_generation while the IO is still in flight.
2999 * Thanks to hard links and renames, the client never knows what
3000 * file an open will affect. So it could avoid that situation
3001 * only by serializing all opens and IO from the same open
3002 * owner. To recover from the old_stateid error, the client
3003 * will just have to retry the IO:
3005 if (in->si_generation < ref->si_generation)
3006 return nfserr_old_stateid;
3011 static int is_delegation_stateid(stateid_t *stateid)
3013 return stateid->si_fileid == 0;
3017 * Checks for stateid operations
3020 nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
3021 stateid_t *stateid, int flags, struct file **filpp)
3023 struct nfs4_stateid *stp = NULL;
3024 struct nfs4_delegation *dp = NULL;
3025 struct svc_fh *current_fh = &cstate->current_fh;
3026 struct inode *ino = current_fh->fh_dentry->d_inode;
3032 if (grace_disallows_io(ino))
3033 return nfserr_grace;
3035 if (nfsd4_has_session(cstate))
3036 flags |= HAS_SESSION;
3038 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3039 return check_special_stateids(current_fh, stateid, flags);
3041 status = nfserr_stale_stateid;
3042 if (STALE_STATEID(stateid))
3046 * We assume that any stateid that has the current boot time,
3047 * but that we can't find, is expired:
3049 status = nfserr_expired;
3050 if (is_delegation_stateid(stateid)) {
3051 dp = find_delegation_stateid(ino, stateid);
3054 status = check_stateid_generation(stateid, &dp->dl_stateid,
3058 status = nfs4_check_delegmode(dp, flags);
3061 renew_client(dp->dl_client);
3063 *filpp = find_readable_file(dp->dl_file);
3066 } else { /* open or lock stateid */
3067 stp = find_stateid(stateid, flags);
3070 status = nfserr_bad_stateid;
3071 if (nfs4_check_fh(current_fh, stp))
3073 if (!stp->st_stateowner->so_confirmed)
3075 status = check_stateid_generation(stateid, &stp->st_stateid,
3079 status = nfs4_check_openmode(stp, flags);
3082 renew_client(stp->st_stateowner->so_client);
3084 if (flags & RD_STATE)
3085 *filpp = find_readable_file(stp->st_file);
3087 *filpp = find_writeable_file(stp->st_file);
3098 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
3099 RD_STATE : WR_STATE;
3103 * Checks for sequence id mutating operations.
3106 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
3107 stateid_t *stateid, int flags,
3108 struct nfs4_stateowner **sopp,
3109 struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
3111 struct nfs4_stateid *stp;
3112 struct nfs4_stateowner *sop;
3113 struct svc_fh *current_fh = &cstate->current_fh;
3116 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
3117 seqid, STATEID_VAL(stateid));
3122 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
3123 dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
3124 return nfserr_bad_stateid;
3127 if (STALE_STATEID(stateid))
3128 return nfserr_stale_stateid;
3130 if (nfsd4_has_session(cstate))
3131 flags |= HAS_SESSION;
3134 * We return BAD_STATEID if filehandle doesn't match stateid,
3135 * the confirmed flag is incorrecly set, or the generation
3136 * number is incorrect.
3138 stp = find_stateid(stateid, flags);
3141 * Also, we should make sure this isn't just the result of
3144 sop = search_close_lru(stateid->si_stateownerid, flags);
3145 /* It's not stale; let's assume it's expired: */
3147 return nfserr_expired;
3153 *sopp = sop = stp->st_stateowner;
3156 clientid_t *lockclid = &lock->v.new.clientid;
3157 struct nfs4_client *clp = sop->so_client;
3161 lkflg = setlkflg(lock->lk_type);
3163 if (lock->lk_is_new) {
3164 if (!sop->so_is_open_owner)
3165 return nfserr_bad_stateid;
3166 if (!(flags & HAS_SESSION) &&
3167 !same_clid(&clp->cl_clientid, lockclid))
3168 return nfserr_bad_stateid;
3169 /* stp is the open stateid */
3170 status = nfs4_check_openmode(stp, lkflg);
3174 /* stp is the lock stateid */
3175 status = nfs4_check_openmode(stp->st_openstp, lkflg);
3181 if (nfs4_check_fh(current_fh, stp)) {
3182 dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
3183 return nfserr_bad_stateid;
3187 * We now validate the seqid and stateid generation numbers.
3188 * For the moment, we ignore the possibility of
3189 * generation number wraparound.
3191 if (!(flags & HAS_SESSION) && seqid != sop->so_seqid)
3194 if (sop->so_confirmed && flags & CONFIRM) {
3195 dprintk("NFSD: preprocess_seqid_op: expected"
3196 " unconfirmed stateowner!\n");
3197 return nfserr_bad_stateid;
3199 if (!sop->so_confirmed && !(flags & CONFIRM)) {
3200 dprintk("NFSD: preprocess_seqid_op: stateowner not"
3201 " confirmed yet!\n");
3202 return nfserr_bad_stateid;
3204 status = check_stateid_generation(stateid, &stp->st_stateid, flags);
3207 renew_client(sop->so_client);
3211 if (seqid == sop->so_seqid - 1) {
3212 dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
3213 /* indicate replay to calling function */
3214 return nfserr_replay_me;
3216 dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
3217 sop->so_seqid, seqid);
3219 return nfserr_bad_seqid;
3223 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3224 struct nfsd4_open_confirm *oc)
3227 struct nfs4_stateowner *sop;
3228 struct nfs4_stateid *stp;
3230 dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
3231 (int)cstate->current_fh.fh_dentry->d_name.len,
3232 cstate->current_fh.fh_dentry->d_name.name);
3234 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
3240 if ((status = nfs4_preprocess_seqid_op(cstate,
3241 oc->oc_seqid, &oc->oc_req_stateid,
3242 CONFIRM | OPEN_STATE,
3243 &oc->oc_stateowner, &stp, NULL)))
3246 sop = oc->oc_stateowner;
3247 sop->so_confirmed = 1;
3248 update_stateid(&stp->st_stateid);
3249 memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
3250 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
3251 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stateid));
3253 nfsd4_create_clid_dir(sop->so_client);
3255 if (oc->oc_stateowner) {
3256 nfs4_get_stateowner(oc->oc_stateowner);
3257 cstate->replay_owner = oc->oc_stateowner;
3259 nfs4_unlock_state();
3265 * unset all bits in union bitmap (bmap) that
3266 * do not exist in share (from successful OPEN_DOWNGRADE)
3269 reset_union_bmap_access(unsigned long access, unsigned long *bmap)
3272 for (i = 1; i < 4; i++) {
3273 if ((i & access) != i)
3274 __clear_bit(i, bmap);
3279 reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
3282 for (i = 0; i < 4; i++) {
3283 if ((i & deny) != i)
3284 __clear_bit(i, bmap);
3289 nfsd4_open_downgrade(struct svc_rqst *rqstp,
3290 struct nfsd4_compound_state *cstate,
3291 struct nfsd4_open_downgrade *od)
3294 struct nfs4_stateid *stp;
3295 unsigned int share_access;
3297 dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
3298 (int)cstate->current_fh.fh_dentry->d_name.len,
3299 cstate->current_fh.fh_dentry->d_name.name);
3301 if (!access_valid(od->od_share_access, cstate->minorversion)
3302 || !deny_valid(od->od_share_deny))
3303 return nfserr_inval;
3306 if ((status = nfs4_preprocess_seqid_op(cstate,
3310 &od->od_stateowner, &stp, NULL)))
3313 status = nfserr_inval;
3314 if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
3315 dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
3316 stp->st_access_bmap, od->od_share_access);
3319 if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
3320 dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
3321 stp->st_deny_bmap, od->od_share_deny);
3324 set_access(&share_access, stp->st_access_bmap);
3325 nfs4_file_downgrade(stp->st_file, share_access & ~od->od_share_access);
3327 reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
3328 reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
3330 update_stateid(&stp->st_stateid);
3331 memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
3334 if (od->od_stateowner) {
3335 nfs4_get_stateowner(od->od_stateowner);
3336 cstate->replay_owner = od->od_stateowner;
3338 nfs4_unlock_state();
3343 * nfs4_unlock_state() called after encode
3346 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3347 struct nfsd4_close *close)
3350 struct nfs4_stateid *stp;
3352 dprintk("NFSD: nfsd4_close on file %.*s\n",
3353 (int)cstate->current_fh.fh_dentry->d_name.len,
3354 cstate->current_fh.fh_dentry->d_name.name);
3357 /* check close_lru for replay */
3358 if ((status = nfs4_preprocess_seqid_op(cstate,
3361 OPEN_STATE | CLOSE_STATE,
3362 &close->cl_stateowner, &stp, NULL)))
3365 update_stateid(&stp->st_stateid);
3366 memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
3368 /* release_stateid() calls nfsd_close() if needed */
3369 release_open_stateid(stp);
3371 /* place unused nfs4_stateowners on so_close_lru list to be
3372 * released by the laundromat service after the lease period
3373 * to enable us to handle CLOSE replay
3375 if (list_empty(&close->cl_stateowner->so_stateids))
3376 move_to_close_lru(close->cl_stateowner);
3378 if (close->cl_stateowner) {
3379 nfs4_get_stateowner(close->cl_stateowner);
3380 cstate->replay_owner = close->cl_stateowner;
3382 nfs4_unlock_state();
3387 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3388 struct nfsd4_delegreturn *dr)
3390 struct nfs4_delegation *dp;
3391 stateid_t *stateid = &dr->dr_stateid;
3392 struct inode *inode;
3396 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
3398 inode = cstate->current_fh.fh_dentry->d_inode;
3400 if (nfsd4_has_session(cstate))
3401 flags |= HAS_SESSION;
3403 status = nfserr_bad_stateid;
3404 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
3406 status = nfserr_stale_stateid;
3407 if (STALE_STATEID(stateid))
3409 status = nfserr_bad_stateid;
3410 if (!is_delegation_stateid(stateid))
3412 status = nfserr_expired;
3413 dp = find_delegation_stateid(inode, stateid);
3416 status = check_stateid_generation(stateid, &dp->dl_stateid, flags);
3419 renew_client(dp->dl_client);
3421 unhash_delegation(dp);
3423 nfs4_unlock_state();
3430 * Lock owner state (byte-range locks)
3432 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
3433 #define LOCK_HASH_BITS 8
3434 #define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
3435 #define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
3438 end_offset(u64 start, u64 len)
3443 return end >= start ? end: NFS4_MAX_UINT64;
3446 /* last octet in a range */
3448 last_byte_offset(u64 start, u64 len)
3454 return end > start ? end - 1: NFS4_MAX_UINT64;
3457 #define lockownerid_hashval(id) \
3458 ((id) & LOCK_HASH_MASK)
3460 static inline unsigned int
3461 lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
3462 struct xdr_netobj *ownername)
3464 return (file_hashval(inode) + cl_id
3465 + opaque_hashval(ownername->data, ownername->len))
3469 static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
3470 static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
3471 static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
3473 static struct nfs4_stateid *
3474 find_stateid(stateid_t *stid, int flags)
3476 struct nfs4_stateid *local;
3477 u32 st_id = stid->si_stateownerid;
3478 u32 f_id = stid->si_fileid;
3479 unsigned int hashval;
3481 dprintk("NFSD: find_stateid flags 0x%x\n",flags);
3482 if (flags & (LOCK_STATE | RD_STATE | WR_STATE)) {
3483 hashval = stateid_hashval(st_id, f_id);
3484 list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
3485 if ((local->st_stateid.si_stateownerid == st_id) &&
3486 (local->st_stateid.si_fileid == f_id))
3491 if (flags & (OPEN_STATE | RD_STATE | WR_STATE)) {
3492 hashval = stateid_hashval(st_id, f_id);
3493 list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
3494 if ((local->st_stateid.si_stateownerid == st_id) &&
3495 (local->st_stateid.si_fileid == f_id))
3502 static struct nfs4_delegation *
3503 find_delegation_stateid(struct inode *ino, stateid_t *stid)
3505 struct nfs4_file *fp;
3506 struct nfs4_delegation *dl;
3508 dprintk("NFSD: %s: stateid=" STATEID_FMT "\n", __func__,
3511 fp = find_file(ino);
3514 dl = find_delegation_file(fp, stid);
3520 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
3521 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
3522 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
3523 * locking, this prevents us from being completely protocol-compliant. The
3524 * real solution to this problem is to start using unsigned file offsets in
3525 * the VFS, but this is a very deep change!
3528 nfs4_transform_lock_offset(struct file_lock *lock)
3530 if (lock->fl_start < 0)
3531 lock->fl_start = OFFSET_MAX;
3532 if (lock->fl_end < 0)
3533 lock->fl_end = OFFSET_MAX;
3536 /* Hack!: For now, we're defining this just so we can use a pointer to it
3537 * as a unique cookie to identify our (NFSv4's) posix locks. */
3538 static const struct lock_manager_operations nfsd_posix_mng_ops = {
3542 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
3544 struct nfs4_stateowner *sop;
3546 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
3547 sop = (struct nfs4_stateowner *) fl->fl_owner;
3548 kref_get(&sop->so_ref);
3550 deny->ld_clientid = sop->so_client->cl_clientid;
3552 deny->ld_sop = NULL;
3553 deny->ld_clientid.cl_boot = 0;
3554 deny->ld_clientid.cl_id = 0;
3556 deny->ld_start = fl->fl_start;
3557 deny->ld_length = NFS4_MAX_UINT64;
3558 if (fl->fl_end != NFS4_MAX_UINT64)
3559 deny->ld_length = fl->fl_end - fl->fl_start + 1;
3560 deny->ld_type = NFS4_READ_LT;
3561 if (fl->fl_type != F_RDLCK)
3562 deny->ld_type = NFS4_WRITE_LT;
3565 static struct nfs4_stateowner *
3566 find_lockstateowner_str(struct inode *inode, clientid_t *clid,
3567 struct xdr_netobj *owner)
3569 unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
3570 struct nfs4_stateowner *op;
3572 list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
3573 if (same_owner_str(op, owner, clid))
3580 * Alloc a lock owner structure.
3581 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
3584 * strhashval = lock_ownerstr_hashval
3587 static struct nfs4_stateowner *
3588 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
3589 struct nfs4_stateowner *sop;
3590 struct nfs4_replay *rp;
3591 unsigned int idhashval;
3593 if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
3595 idhashval = lockownerid_hashval(current_ownerid);
3596 INIT_LIST_HEAD(&sop->so_idhash);
3597 INIT_LIST_HEAD(&sop->so_strhash);
3598 INIT_LIST_HEAD(&sop->so_perclient);
3599 INIT_LIST_HEAD(&sop->so_stateids);
3600 INIT_LIST_HEAD(&sop->so_perstateid);
3601 INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
3603 list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
3604 list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
3605 list_add(&sop->so_perstateid, &open_stp->st_lockowners);
3606 sop->so_is_open_owner = 0;
3607 sop->so_id = current_ownerid++;
3608 sop->so_client = clp;
3609 /* It is the openowner seqid that will be incremented in encode in the
3610 * case of new lockowners; so increment the lock seqid manually: */
3611 sop->so_seqid = lock->lk_new_lock_seqid + 1;
3612 sop->so_confirmed = 1;
3613 rp = &sop->so_replay;
3614 rp->rp_status = nfserr_serverfault;
3616 rp->rp_buf = rp->rp_ibuf;
3620 static struct nfs4_stateid *
3621 alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
3623 struct nfs4_stateid *stp;
3624 unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
3626 stp = nfs4_alloc_stateid();
3629 INIT_LIST_HEAD(&stp->st_hash);
3630 INIT_LIST_HEAD(&stp->st_perfile);
3631 INIT_LIST_HEAD(&stp->st_perstateowner);
3632 INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
3633 list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
3634 list_add(&stp->st_perfile, &fp->fi_stateids);
3635 list_add(&stp->st_perstateowner, &sop->so_stateids);
3636 stp->st_stateowner = sop;
3639 stp->st_stateid.si_boot = boot_time;
3640 stp->st_stateid.si_stateownerid = sop->so_id;
3641 stp->st_stateid.si_fileid = fp->fi_id;
3642 stp->st_stateid.si_generation = 0;
3643 stp->st_deny_bmap = open_stp->st_deny_bmap;
3644 stp->st_openstp = open_stp;
3651 check_lock_length(u64 offset, u64 length)
3653 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
3654 LOFF_OVERFLOW(offset, length)));
3661 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3662 struct nfsd4_lock *lock)
3664 struct nfs4_stateowner *open_sop = NULL;
3665 struct nfs4_stateowner *lock_sop = NULL;
3666 struct nfs4_stateid *lock_stp;
3667 struct nfs4_file *fp;
3668 struct file *filp = NULL;
3669 struct file_lock file_lock;
3670 struct file_lock conflock;
3672 unsigned int strhashval;
3676 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
3677 (long long) lock->lk_offset,
3678 (long long) lock->lk_length);
3680 if (check_lock_length(lock->lk_offset, lock->lk_length))
3681 return nfserr_inval;
3683 if ((status = fh_verify(rqstp, &cstate->current_fh,
3684 S_IFREG, NFSD_MAY_LOCK))) {
3685 dprintk("NFSD: nfsd4_lock: permission denied!\n");
3691 if (lock->lk_is_new) {
3693 * Client indicates that this is a new lockowner.
3694 * Use open owner and open stateid to create lock owner and
3697 struct nfs4_stateid *open_stp = NULL;
3699 status = nfserr_stale_clientid;
3700 if (!nfsd4_has_session(cstate) &&
3701 STALE_CLIENTID(&lock->lk_new_clientid))
3704 /* validate and update open stateid and open seqid */
3705 status = nfs4_preprocess_seqid_op(cstate,
3706 lock->lk_new_open_seqid,
3707 &lock->lk_new_open_stateid,
3709 &lock->lk_replay_owner, &open_stp,
3713 open_sop = lock->lk_replay_owner;
3714 /* create lockowner and lock stateid */
3715 fp = open_stp->st_file;
3716 strhashval = lock_ownerstr_hashval(fp->fi_inode,
3717 open_sop->so_client->cl_clientid.cl_id,
3718 &lock->v.new.owner);
3719 /* XXX: Do we need to check for duplicate stateowners on
3720 * the same file, or should they just be allowed (and
3721 * create new stateids)? */
3722 status = nfserr_resource;
3723 lock_sop = alloc_init_lock_stateowner(strhashval,
3724 open_sop->so_client, open_stp, lock);
3725 if (lock_sop == NULL)
3727 lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
3728 if (lock_stp == NULL)
3731 /* lock (lock owner + lock stateid) already exists */
3732 status = nfs4_preprocess_seqid_op(cstate,
3733 lock->lk_old_lock_seqid,
3734 &lock->lk_old_lock_stateid,
3736 &lock->lk_replay_owner, &lock_stp, lock);
3739 lock_sop = lock->lk_replay_owner;
3740 fp = lock_stp->st_file;
3742 /* lock->lk_replay_owner and lock_stp have been created or found */
3744 status = nfserr_grace;
3745 if (locks_in_grace() && !lock->lk_reclaim)
3747 status = nfserr_no_grace;
3748 if (!locks_in_grace() && lock->lk_reclaim)
3751 locks_init_lock(&file_lock);
3752 switch (lock->lk_type) {
3755 if (find_readable_file(lock_stp->st_file)) {
3756 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_READ);
3757 filp = find_readable_file(lock_stp->st_file);
3759 file_lock.fl_type = F_RDLCK;
3763 case NFS4_WRITEW_LT:
3764 if (find_writeable_file(lock_stp->st_file)) {
3765 nfs4_get_vfs_file(rqstp, fp, &cstate->current_fh, NFS4_SHARE_ACCESS_WRITE);
3766 filp = find_writeable_file(lock_stp->st_file);
3768 file_lock.fl_type = F_WRLCK;
3772 status = nfserr_inval;
3776 status = nfserr_openmode;
3779 file_lock.fl_owner = (fl_owner_t)lock_sop;
3780 file_lock.fl_pid = current->tgid;
3781 file_lock.fl_file = filp;
3782 file_lock.fl_flags = FL_POSIX;
3783 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3785 file_lock.fl_start = lock->lk_offset;
3786 file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
3787 nfs4_transform_lock_offset(&file_lock);
3790 * Try to lock the file in the VFS.
3791 * Note: locks.c uses the BKL to protect the inode's lock list.
3794 err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
3796 case 0: /* success! */
3797 update_stateid(&lock_stp->st_stateid);
3798 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
3802 case (EAGAIN): /* conflock holds conflicting lock */
3803 status = nfserr_denied;
3804 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
3805 nfs4_set_lock_denied(&conflock, &lock->lk_denied);
3808 status = nfserr_deadlock;
3811 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
3812 status = nfserr_resource;
3816 if (status && lock->lk_is_new && lock_sop)
3817 release_lockowner(lock_sop);
3818 if (lock->lk_replay_owner) {
3819 nfs4_get_stateowner(lock->lk_replay_owner);
3820 cstate->replay_owner = lock->lk_replay_owner;
3822 nfs4_unlock_state();
3827 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
3828 * so we do a temporary open here just to get an open file to pass to
3829 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
3832 static int nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
3837 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
3840 err = vfs_test_lock(file, lock);
3849 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3850 struct nfsd4_lockt *lockt)
3852 struct inode *inode;
3853 struct file_lock file_lock;
3857 if (locks_in_grace())
3858 return nfserr_grace;
3860 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
3861 return nfserr_inval;
3863 lockt->lt_stateowner = NULL;
3866 status = nfserr_stale_clientid;
3867 if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
3870 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
3871 dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
3872 if (status == nfserr_symlink)
3873 status = nfserr_inval;
3877 inode = cstate->current_fh.fh_dentry->d_inode;
3878 locks_init_lock(&file_lock);
3879 switch (lockt->lt_type) {
3882 file_lock.fl_type = F_RDLCK;
3885 case NFS4_WRITEW_LT:
3886 file_lock.fl_type = F_WRLCK;
3889 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
3890 status = nfserr_inval;
3894 lockt->lt_stateowner = find_lockstateowner_str(inode,
3895 &lockt->lt_clientid, &lockt->lt_owner);
3896 if (lockt->lt_stateowner)
3897 file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
3898 file_lock.fl_pid = current->tgid;
3899 file_lock.fl_flags = FL_POSIX;
3901 file_lock.fl_start = lockt->lt_offset;
3902 file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
3904 nfs4_transform_lock_offset(&file_lock);
3907 error = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
3909 status = nfserrno(error);
3912 if (file_lock.fl_type != F_UNLCK) {
3913 status = nfserr_denied;
3914 nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
3917 nfs4_unlock_state();
3922 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3923 struct nfsd4_locku *locku)
3925 struct nfs4_stateid *stp;
3926 struct file *filp = NULL;
3927 struct file_lock file_lock;
3931 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
3932 (long long) locku->lu_offset,
3933 (long long) locku->lu_length);
3935 if (check_lock_length(locku->lu_offset, locku->lu_length))
3936 return nfserr_inval;
3940 if ((status = nfs4_preprocess_seqid_op(cstate,
3944 &locku->lu_stateowner, &stp, NULL)))
3947 filp = find_any_file(stp->st_file);
3949 status = nfserr_lock_range;
3953 locks_init_lock(&file_lock);
3954 file_lock.fl_type = F_UNLCK;
3955 file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
3956 file_lock.fl_pid = current->tgid;
3957 file_lock.fl_file = filp;
3958 file_lock.fl_flags = FL_POSIX;
3959 file_lock.fl_lmops = &nfsd_posix_mng_ops;
3960 file_lock.fl_start = locku->lu_offset;
3962 file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
3963 nfs4_transform_lock_offset(&file_lock);
3966 * Try to unlock the file in the VFS.
3968 err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
3970 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
3974 * OK, unlock succeeded; the only thing left to do is update the stateid.
3976 update_stateid(&stp->st_stateid);
3977 memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
3980 if (locku->lu_stateowner) {
3981 nfs4_get_stateowner(locku->lu_stateowner);
3982 cstate->replay_owner = locku->lu_stateowner;
3984 nfs4_unlock_state();
3988 status = nfserrno(err);
3994 * 1: locks held by lockowner
3995 * 0: no locks held by lockowner
3998 check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner)
4000 struct file_lock **flpp;
4001 struct inode *inode = filp->fi_inode;
4005 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
4006 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
4017 nfsd4_release_lockowner(struct svc_rqst *rqstp,
4018 struct nfsd4_compound_state *cstate,
4019 struct nfsd4_release_lockowner *rlockowner)
4021 clientid_t *clid = &rlockowner->rl_clientid;
4022 struct nfs4_stateowner *sop;
4023 struct nfs4_stateid *stp;
4024 struct xdr_netobj *owner = &rlockowner->rl_owner;
4025 struct list_head matches;
4029 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
4030 clid->cl_boot, clid->cl_id);
4032 /* XXX check for lease expiration */
4034 status = nfserr_stale_clientid;
4035 if (STALE_CLIENTID(clid))
4040 status = nfserr_locks_held;
4041 /* XXX: we're doing a linear search through all the lockowners.
4042 * Yipes! For now we'll just hope clients aren't really using
4043 * release_lockowner much, but eventually we have to fix these
4044 * data structures. */
4045 INIT_LIST_HEAD(&matches);
4046 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4047 list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
4048 if (!same_owner_str(sop, owner, clid))
4050 list_for_each_entry(stp, &sop->so_stateids,
4052 if (check_for_locks(stp->st_file, sop))
4054 /* Note: so_perclient unused for lockowners,
4055 * so it's OK to fool with here. */
4056 list_add(&sop->so_perclient, &matches);
4060 /* Clients probably won't expect us to return with some (but not all)
4061 * of the lockowner state released; so don't release any until all
4062 * have been checked. */
4064 while (!list_empty(&matches)) {
4065 sop = list_entry(matches.next, struct nfs4_stateowner,
4067 /* unhash_stateowner deletes so_perclient only
4068 * for openowners. */
4069 list_del(&sop->so_perclient);
4070 release_lockowner(sop);
4073 nfs4_unlock_state();
4077 static inline struct nfs4_client_reclaim *
4080 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
4084 nfs4_has_reclaimed_state(const char *name, bool use_exchange_id)
4086 unsigned int strhashval = clientstr_hashval(name);
4087 struct nfs4_client *clp;
4089 clp = find_confirmed_client_by_str(name, strhashval);
4094 * failure => all reset bets are off, nfserr_no_grace...
4097 nfs4_client_to_reclaim(const char *name)
4099 unsigned int strhashval;
4100 struct nfs4_client_reclaim *crp = NULL;
4102 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
4103 crp = alloc_reclaim();
4106 strhashval = clientstr_hashval(name);
4107 INIT_LIST_HEAD(&crp->cr_strhash);
4108 list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
4109 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
4110 reclaim_str_hashtbl_size++;
4115 nfs4_release_reclaim(void)
4117 struct nfs4_client_reclaim *crp = NULL;
4120 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4121 while (!list_empty(&reclaim_str_hashtbl[i])) {
4122 crp = list_entry(reclaim_str_hashtbl[i].next,
4123 struct nfs4_client_reclaim, cr_strhash);
4124 list_del(&crp->cr_strhash);
4126 reclaim_str_hashtbl_size--;
4129 BUG_ON(reclaim_str_hashtbl_size);
4133 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
4134 static struct nfs4_client_reclaim *
4135 nfs4_find_reclaim_client(clientid_t *clid)
4137 unsigned int strhashval;
4138 struct nfs4_client *clp;
4139 struct nfs4_client_reclaim *crp = NULL;
4142 /* find clientid in conf_id_hashtbl */
4143 clp = find_confirmed_client(clid);
4147 dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
4148 clp->cl_name.len, clp->cl_name.data,
4151 /* find clp->cl_name in reclaim_str_hashtbl */
4152 strhashval = clientstr_hashval(clp->cl_recdir);
4153 list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
4154 if (same_name(crp->cr_recdir, clp->cl_recdir)) {
4162 * Called from OPEN. Look for clientid in reclaim list.
4165 nfs4_check_open_reclaim(clientid_t *clid)
4167 return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
4170 /* initialization to perform at module load time: */
4173 nfs4_state_init(void)
4177 status = nfsd4_init_slabs();
4180 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4181 INIT_LIST_HEAD(&conf_id_hashtbl[i]);
4182 INIT_LIST_HEAD(&conf_str_hashtbl[i]);
4183 INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
4184 INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
4185 INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
4187 for (i = 0; i < SESSION_HASH_SIZE; i++)
4188 INIT_LIST_HEAD(&sessionid_hashtbl[i]);
4189 for (i = 0; i < FILE_HASH_SIZE; i++) {
4190 INIT_LIST_HEAD(&file_hashtbl[i]);
4192 for (i = 0; i < OWNER_HASH_SIZE; i++) {
4193 INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
4194 INIT_LIST_HEAD(&ownerid_hashtbl[i]);
4196 for (i = 0; i < STATEID_HASH_SIZE; i++) {
4197 INIT_LIST_HEAD(&stateid_hashtbl[i]);
4198 INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
4200 for (i = 0; i < LOCK_HASH_SIZE; i++) {
4201 INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
4202 INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
4204 memset(&onestateid, ~0, sizeof(stateid_t));
4205 INIT_LIST_HEAD(&close_lru);
4206 INIT_LIST_HEAD(&client_lru);
4207 INIT_LIST_HEAD(&del_recall_lru);
4208 reclaim_str_hashtbl_size = 0;
4213 nfsd4_load_reboot_recovery_data(void)
4218 nfsd4_init_recdir(user_recovery_dirname);
4219 status = nfsd4_recdir_load();
4220 nfs4_unlock_state();
4222 printk("NFSD: Failure reading reboot recovery data\n");
4226 * Since the lifetime of a delegation isn't limited to that of an open, a
4227 * client may quite reasonably hang on to a delegation as long as it has
4228 * the inode cached. This becomes an obvious problem the first time a
4229 * client's inode cache approaches the size of the server's total memory.
4231 * For now we avoid this problem by imposing a hard limit on the number
4232 * of delegations, which varies according to the server's memory size.
4235 set_max_delegations(void)
4238 * Allow at most 4 delegations per megabyte of RAM. Quick
4239 * estimates suggest that in the worst case (where every delegation
4240 * is for a different inode), a delegation could take about 1.5K,
4241 * giving a worst case usage of about 6% of memory.
4243 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
4246 /* initialization to perform when the nfsd service is started: */
4249 __nfs4_state_start(void)
4253 boot_time = get_seconds();
4254 locks_start_grace(&nfsd4_manager);
4255 printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
4257 ret = set_callback_cred();
4260 laundry_wq = create_singlethread_workqueue("nfsd4");
4261 if (laundry_wq == NULL)
4263 ret = nfsd4_create_callback_queue();
4265 goto out_free_laundry;
4266 queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
4267 set_max_delegations();
4270 destroy_workqueue(laundry_wq);
4275 nfs4_state_start(void)
4277 nfsd4_load_reboot_recovery_data();
4278 return __nfs4_state_start();
4282 __nfs4_state_shutdown(void)
4285 struct nfs4_client *clp = NULL;
4286 struct nfs4_delegation *dp = NULL;
4287 struct list_head *pos, *next, reaplist;
4289 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
4290 while (!list_empty(&conf_id_hashtbl[i])) {
4291 clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
4294 while (!list_empty(&unconf_str_hashtbl[i])) {
4295 clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
4299 INIT_LIST_HEAD(&reaplist);
4300 spin_lock(&recall_lock);
4301 list_for_each_safe(pos, next, &del_recall_lru) {
4302 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4303 list_move(&dp->dl_recall_lru, &reaplist);
4305 spin_unlock(&recall_lock);
4306 list_for_each_safe(pos, next, &reaplist) {
4307 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4308 list_del_init(&dp->dl_recall_lru);
4309 unhash_delegation(dp);
4312 nfsd4_shutdown_recdir();
4316 nfs4_state_shutdown(void)
4318 cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
4319 destroy_workqueue(laundry_wq);
4320 locks_end_grace(&nfsd4_manager);
4322 nfs4_release_reclaim();
4323 __nfs4_state_shutdown();
4324 nfs4_unlock_state();
4325 nfsd4_destroy_callback_queue();
4329 * user_recovery_dirname is protected by the nfsd_mutex since it's only
4330 * accessed when nfsd is starting.
4333 nfs4_set_recdir(char *recdir)
4335 strcpy(user_recovery_dirname, recdir);
4339 * Change the NFSv4 recovery directory to recdir.
4342 nfs4_reset_recoverydir(char *recdir)
4347 status = kern_path(recdir, LOOKUP_FOLLOW, &path);
4351 if (S_ISDIR(path.dentry->d_inode->i_mode)) {
4352 nfs4_set_recdir(recdir);
4360 nfs4_recoverydir(void)
4362 return user_recovery_dirname;