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/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/hash.h>
48 #include "current_stateid.h"
52 #define NFSDDBG_FACILITY NFSDDBG_PROC
54 #define all_ones {{~0,~0},~0}
55 static const stateid_t one_stateid = {
57 .si_opaque = all_ones,
59 static const stateid_t zero_stateid = {
62 static const stateid_t currentstateid = {
66 static u64 current_sessionid = 1;
68 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
69 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
70 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
72 /* forward declarations */
73 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
74 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
78 /* Currently used for almost all code touching nfsv4 state: */
79 static DEFINE_MUTEX(client_mutex);
82 * Currently used for the del_recall_lru and file hash table. In an
83 * effort to decrease the scope of the client_mutex, this spinlock may
84 * eventually cover more:
86 static DEFINE_SPINLOCK(state_lock);
89 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
90 * the refcount on the open stateid to drop.
92 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
94 static struct kmem_cache *openowner_slab;
95 static struct kmem_cache *lockowner_slab;
96 static struct kmem_cache *file_slab;
97 static struct kmem_cache *stateid_slab;
98 static struct kmem_cache *deleg_slab;
101 nfs4_lock_state(void)
103 mutex_lock(&client_mutex);
106 static void free_session(struct nfsd4_session *);
108 static bool is_session_dead(struct nfsd4_session *ses)
110 return ses->se_flags & NFS4_SESSION_DEAD;
113 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
115 if (atomic_read(&ses->se_ref) > ref_held_by_me)
116 return nfserr_jukebox;
117 ses->se_flags |= NFS4_SESSION_DEAD;
122 nfs4_unlock_state(void)
124 mutex_unlock(&client_mutex);
127 static bool is_client_expired(struct nfs4_client *clp)
129 return clp->cl_time == 0;
132 static __be32 get_client_locked(struct nfs4_client *clp)
134 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
136 lockdep_assert_held(&nn->client_lock);
138 if (is_client_expired(clp))
139 return nfserr_expired;
140 atomic_inc(&clp->cl_refcount);
144 /* must be called under the client_lock */
146 renew_client_locked(struct nfs4_client *clp)
148 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
150 if (is_client_expired(clp)) {
152 printk("%s: client (clientid %08x/%08x) already expired\n",
154 clp->cl_clientid.cl_boot,
155 clp->cl_clientid.cl_id);
159 dprintk("renewing client (clientid %08x/%08x)\n",
160 clp->cl_clientid.cl_boot,
161 clp->cl_clientid.cl_id);
162 list_move_tail(&clp->cl_lru, &nn->client_lru);
163 clp->cl_time = get_seconds();
167 renew_client(struct nfs4_client *clp)
169 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
171 spin_lock(&nn->client_lock);
172 renew_client_locked(clp);
173 spin_unlock(&nn->client_lock);
176 static void put_client_renew_locked(struct nfs4_client *clp)
178 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
180 lockdep_assert_held(&nn->client_lock);
182 if (!atomic_dec_and_test(&clp->cl_refcount))
184 if (!is_client_expired(clp))
185 renew_client_locked(clp);
188 static void put_client_renew(struct nfs4_client *clp)
190 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
192 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
194 if (!is_client_expired(clp))
195 renew_client_locked(clp);
196 spin_unlock(&nn->client_lock);
199 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
203 if (is_session_dead(ses))
204 return nfserr_badsession;
205 status = get_client_locked(ses->se_client);
208 atomic_inc(&ses->se_ref);
212 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
214 struct nfs4_client *clp = ses->se_client;
215 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
217 lockdep_assert_held(&nn->client_lock);
219 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
221 put_client_renew_locked(clp);
224 static void nfsd4_put_session(struct nfsd4_session *ses)
226 struct nfs4_client *clp = ses->se_client;
227 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
229 spin_lock(&nn->client_lock);
230 nfsd4_put_session_locked(ses);
231 spin_unlock(&nn->client_lock);
235 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
237 return (sop->so_owner.len == owner->len) &&
238 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
241 static struct nfs4_openowner *
242 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
243 struct nfs4_client *clp)
245 struct nfs4_stateowner *so;
247 lockdep_assert_held(&clp->cl_lock);
249 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
251 if (!so->so_is_open_owner)
253 if (same_owner_str(so, &open->op_owner)) {
254 atomic_inc(&so->so_count);
255 return openowner(so);
261 static struct nfs4_openowner *
262 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
263 struct nfs4_client *clp)
265 struct nfs4_openowner *oo;
267 spin_lock(&clp->cl_lock);
268 oo = find_openstateowner_str_locked(hashval, open, clp);
269 spin_unlock(&clp->cl_lock);
274 opaque_hashval(const void *ptr, int nbytes)
276 unsigned char *cptr = (unsigned char *) ptr;
286 static void nfsd4_free_file(struct nfs4_file *f)
288 kmem_cache_free(file_slab, f);
292 put_nfs4_file(struct nfs4_file *fi)
294 might_lock(&state_lock);
296 if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
297 hlist_del(&fi->fi_hash);
298 spin_unlock(&state_lock);
304 get_nfs4_file(struct nfs4_file *fi)
306 atomic_inc(&fi->fi_ref);
310 __nfs4_get_fd(struct nfs4_file *f, int oflag)
312 if (f->fi_fds[oflag])
313 return get_file(f->fi_fds[oflag]);
318 find_writeable_file_locked(struct nfs4_file *f)
322 lockdep_assert_held(&f->fi_lock);
324 ret = __nfs4_get_fd(f, O_WRONLY);
326 ret = __nfs4_get_fd(f, O_RDWR);
331 find_writeable_file(struct nfs4_file *f)
335 spin_lock(&f->fi_lock);
336 ret = find_writeable_file_locked(f);
337 spin_unlock(&f->fi_lock);
342 static struct file *find_readable_file_locked(struct nfs4_file *f)
346 lockdep_assert_held(&f->fi_lock);
348 ret = __nfs4_get_fd(f, O_RDONLY);
350 ret = __nfs4_get_fd(f, O_RDWR);
355 find_readable_file(struct nfs4_file *f)
359 spin_lock(&f->fi_lock);
360 ret = find_readable_file_locked(f);
361 spin_unlock(&f->fi_lock);
367 find_any_file(struct nfs4_file *f)
371 spin_lock(&f->fi_lock);
372 ret = __nfs4_get_fd(f, O_RDWR);
374 ret = __nfs4_get_fd(f, O_WRONLY);
376 ret = __nfs4_get_fd(f, O_RDONLY);
378 spin_unlock(&f->fi_lock);
382 static atomic_long_t num_delegations;
383 unsigned long max_delegations;
386 * Open owner state (share locks)
389 /* hash tables for lock and open owners */
390 #define OWNER_HASH_BITS 8
391 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
392 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
394 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
398 ret = opaque_hashval(ownername->data, ownername->len);
399 return ret & OWNER_HASH_MASK;
402 /* hash table for nfs4_file */
403 #define FILE_HASH_BITS 8
404 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
406 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
408 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
411 static unsigned int file_hashval(struct knfsd_fh *fh)
413 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
416 static bool nfsd_fh_match(struct knfsd_fh *fh1, struct knfsd_fh *fh2)
418 return fh1->fh_size == fh2->fh_size &&
419 !memcmp(fh1->fh_base.fh_pad,
424 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
427 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
429 lockdep_assert_held(&fp->fi_lock);
431 if (access & NFS4_SHARE_ACCESS_WRITE)
432 atomic_inc(&fp->fi_access[O_WRONLY]);
433 if (access & NFS4_SHARE_ACCESS_READ)
434 atomic_inc(&fp->fi_access[O_RDONLY]);
438 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
440 lockdep_assert_held(&fp->fi_lock);
442 /* Does this access mode make sense? */
443 if (access & ~NFS4_SHARE_ACCESS_BOTH)
446 /* Does it conflict with a deny mode already set? */
447 if ((access & fp->fi_share_deny) != 0)
448 return nfserr_share_denied;
450 __nfs4_file_get_access(fp, access);
454 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
456 /* Common case is that there is no deny mode. */
458 /* Does this deny mode make sense? */
459 if (deny & ~NFS4_SHARE_DENY_BOTH)
462 if ((deny & NFS4_SHARE_DENY_READ) &&
463 atomic_read(&fp->fi_access[O_RDONLY]))
464 return nfserr_share_denied;
466 if ((deny & NFS4_SHARE_DENY_WRITE) &&
467 atomic_read(&fp->fi_access[O_WRONLY]))
468 return nfserr_share_denied;
473 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
475 might_lock(&fp->fi_lock);
477 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
478 struct file *f1 = NULL;
479 struct file *f2 = NULL;
481 swap(f1, fp->fi_fds[oflag]);
482 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
483 swap(f2, fp->fi_fds[O_RDWR]);
484 spin_unlock(&fp->fi_lock);
492 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
494 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
496 if (access & NFS4_SHARE_ACCESS_WRITE)
497 __nfs4_file_put_access(fp, O_WRONLY);
498 if (access & NFS4_SHARE_ACCESS_READ)
499 __nfs4_file_put_access(fp, O_RDONLY);
502 static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl,
503 struct kmem_cache *slab)
505 struct nfs4_stid *stid;
508 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
512 idr_preload(GFP_KERNEL);
513 spin_lock(&cl->cl_lock);
514 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
515 spin_unlock(&cl->cl_lock);
519 stid->sc_client = cl;
520 stid->sc_stateid.si_opaque.so_id = new_id;
521 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
522 /* Will be incremented before return to client: */
523 atomic_set(&stid->sc_count, 1);
526 * It shouldn't be a problem to reuse an opaque stateid value.
527 * I don't think it is for 4.1. But with 4.0 I worry that, for
528 * example, a stray write retransmission could be accepted by
529 * the server when it should have been rejected. Therefore,
530 * adopt a trick from the sctp code to attempt to maximize the
531 * amount of time until an id is reused, by ensuring they always
532 * "increase" (mod INT_MAX):
536 kmem_cache_free(slab, stid);
540 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
542 struct nfs4_stid *stid;
543 struct nfs4_ol_stateid *stp;
545 stid = nfs4_alloc_stid(clp, stateid_slab);
549 stp = openlockstateid(stid);
550 stp->st_stid.sc_free = nfs4_free_ol_stateid;
554 static void nfs4_free_deleg(struct nfs4_stid *stid)
556 kmem_cache_free(deleg_slab, stid);
557 atomic_long_dec(&num_delegations);
561 * When we recall a delegation, we should be careful not to hand it
562 * out again straight away.
563 * To ensure this we keep a pair of bloom filters ('new' and 'old')
564 * in which the filehandles of recalled delegations are "stored".
565 * If a filehandle appear in either filter, a delegation is blocked.
566 * When a delegation is recalled, the filehandle is stored in the "new"
568 * Every 30 seconds we swap the filters and clear the "new" one,
569 * unless both are empty of course.
571 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
572 * low 3 bytes as hash-table indices.
574 * 'blocked_delegations_lock', which is always taken in block_delegations(),
575 * is used to manage concurrent access. Testing does not need the lock
576 * except when swapping the two filters.
578 static DEFINE_SPINLOCK(blocked_delegations_lock);
579 static struct bloom_pair {
580 int entries, old_entries;
582 int new; /* index into 'set' */
583 DECLARE_BITMAP(set[2], 256);
584 } blocked_delegations;
586 static int delegation_blocked(struct knfsd_fh *fh)
589 struct bloom_pair *bd = &blocked_delegations;
591 if (bd->entries == 0)
593 if (seconds_since_boot() - bd->swap_time > 30) {
594 spin_lock(&blocked_delegations_lock);
595 if (seconds_since_boot() - bd->swap_time > 30) {
596 bd->entries -= bd->old_entries;
597 bd->old_entries = bd->entries;
598 memset(bd->set[bd->new], 0,
601 bd->swap_time = seconds_since_boot();
603 spin_unlock(&blocked_delegations_lock);
605 hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
606 if (test_bit(hash&255, bd->set[0]) &&
607 test_bit((hash>>8)&255, bd->set[0]) &&
608 test_bit((hash>>16)&255, bd->set[0]))
611 if (test_bit(hash&255, bd->set[1]) &&
612 test_bit((hash>>8)&255, bd->set[1]) &&
613 test_bit((hash>>16)&255, bd->set[1]))
619 static void block_delegations(struct knfsd_fh *fh)
622 struct bloom_pair *bd = &blocked_delegations;
624 hash = arch_fast_hash(&fh->fh_base, fh->fh_size, 0);
626 spin_lock(&blocked_delegations_lock);
627 __set_bit(hash&255, bd->set[bd->new]);
628 __set_bit((hash>>8)&255, bd->set[bd->new]);
629 __set_bit((hash>>16)&255, bd->set[bd->new]);
630 if (bd->entries == 0)
631 bd->swap_time = seconds_since_boot();
633 spin_unlock(&blocked_delegations_lock);
636 static struct nfs4_delegation *
637 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh)
639 struct nfs4_delegation *dp;
642 dprintk("NFSD alloc_init_deleg\n");
643 n = atomic_long_inc_return(&num_delegations);
644 if (n < 0 || n > max_delegations)
646 if (delegation_blocked(¤t_fh->fh_handle))
648 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
652 dp->dl_stid.sc_free = nfs4_free_deleg;
654 * delegation seqid's are never incremented. The 4.1 special
655 * meaning of seqid 0 isn't meaningful, really, but let's avoid
656 * 0 anyway just for consistency and use 1:
658 dp->dl_stid.sc_stateid.si_generation = 1;
659 INIT_LIST_HEAD(&dp->dl_perfile);
660 INIT_LIST_HEAD(&dp->dl_perclnt);
661 INIT_LIST_HEAD(&dp->dl_recall_lru);
662 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
663 INIT_WORK(&dp->dl_recall.cb_work, nfsd4_run_cb_recall);
666 atomic_long_dec(&num_delegations);
671 nfs4_put_stid(struct nfs4_stid *s)
673 struct nfs4_file *fp = s->sc_file;
674 struct nfs4_client *clp = s->sc_client;
676 might_lock(&clp->cl_lock);
678 if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
679 wake_up_all(&close_wq);
682 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
683 spin_unlock(&clp->cl_lock);
689 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
691 lockdep_assert_held(&state_lock);
695 if (atomic_dec_and_test(&fp->fi_delegees)) {
696 vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
698 fput(fp->fi_deleg_file);
699 fp->fi_deleg_file = NULL;
703 static void unhash_stid(struct nfs4_stid *s)
709 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
711 lockdep_assert_held(&state_lock);
712 lockdep_assert_held(&fp->fi_lock);
714 atomic_inc(&dp->dl_stid.sc_count);
715 dp->dl_stid.sc_type = NFS4_DELEG_STID;
716 list_add(&dp->dl_perfile, &fp->fi_delegations);
717 list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
721 unhash_delegation_locked(struct nfs4_delegation *dp)
723 struct nfs4_file *fp = dp->dl_stid.sc_file;
725 lockdep_assert_held(&state_lock);
727 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
728 /* Ensure that deleg break won't try to requeue it */
730 spin_lock(&fp->fi_lock);
731 list_del_init(&dp->dl_perclnt);
732 list_del_init(&dp->dl_recall_lru);
733 list_del_init(&dp->dl_perfile);
734 spin_unlock(&fp->fi_lock);
736 nfs4_put_deleg_lease(fp);
739 static void destroy_delegation(struct nfs4_delegation *dp)
741 spin_lock(&state_lock);
742 unhash_delegation_locked(dp);
743 spin_unlock(&state_lock);
744 nfs4_put_stid(&dp->dl_stid);
747 static void revoke_delegation(struct nfs4_delegation *dp)
749 struct nfs4_client *clp = dp->dl_stid.sc_client;
751 WARN_ON(!list_empty(&dp->dl_recall_lru));
753 if (clp->cl_minorversion == 0)
754 nfs4_put_stid(&dp->dl_stid);
756 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
757 spin_lock(&clp->cl_lock);
758 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
759 spin_unlock(&clp->cl_lock);
767 static unsigned int clientid_hashval(u32 id)
769 return id & CLIENT_HASH_MASK;
772 static unsigned int clientstr_hashval(const char *name)
774 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
778 * We store the NONE, READ, WRITE, and BOTH bits separately in the
779 * st_{access,deny}_bmap field of the stateid, in order to track not
780 * only what share bits are currently in force, but also what
781 * combinations of share bits previous opens have used. This allows us
782 * to enforce the recommendation of rfc 3530 14.2.19 that the server
783 * return an error if the client attempt to downgrade to a combination
784 * of share bits not explicable by closing some of its previous opens.
786 * XXX: This enforcement is actually incomplete, since we don't keep
787 * track of access/deny bit combinations; so, e.g., we allow:
789 * OPEN allow read, deny write
790 * OPEN allow both, deny none
791 * DOWNGRADE allow read, deny none
793 * which we should reject.
796 bmap_to_share_mode(unsigned long bmap) {
798 unsigned int access = 0;
800 for (i = 1; i < 4; i++) {
801 if (test_bit(i, &bmap))
807 /* set share access for a given stateid */
809 set_access(u32 access, struct nfs4_ol_stateid *stp)
811 unsigned char mask = 1 << access;
813 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
814 stp->st_access_bmap |= mask;
817 /* clear share access for a given stateid */
819 clear_access(u32 access, struct nfs4_ol_stateid *stp)
821 unsigned char mask = 1 << access;
823 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
824 stp->st_access_bmap &= ~mask;
827 /* test whether a given stateid has access */
829 test_access(u32 access, struct nfs4_ol_stateid *stp)
831 unsigned char mask = 1 << access;
833 return (bool)(stp->st_access_bmap & mask);
836 /* set share deny for a given stateid */
838 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
840 unsigned char mask = 1 << deny;
842 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
843 stp->st_deny_bmap |= mask;
846 /* clear share deny for a given stateid */
848 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
850 unsigned char mask = 1 << deny;
852 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
853 stp->st_deny_bmap &= ~mask;
856 /* test whether a given stateid is denying specific access */
858 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
860 unsigned char mask = 1 << deny;
862 return (bool)(stp->st_deny_bmap & mask);
865 static int nfs4_access_to_omode(u32 access)
867 switch (access & NFS4_SHARE_ACCESS_BOTH) {
868 case NFS4_SHARE_ACCESS_READ:
870 case NFS4_SHARE_ACCESS_WRITE:
872 case NFS4_SHARE_ACCESS_BOTH:
880 * A stateid that had a deny mode associated with it is being released
881 * or downgraded. Recalculate the deny mode on the file.
884 recalculate_deny_mode(struct nfs4_file *fp)
886 struct nfs4_ol_stateid *stp;
888 spin_lock(&fp->fi_lock);
889 fp->fi_share_deny = 0;
890 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
891 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
892 spin_unlock(&fp->fi_lock);
896 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
901 for (i = 1; i < 4; i++) {
902 if ((i & deny) != i) {
908 /* Recalculate per-file deny mode if there was a change */
910 recalculate_deny_mode(stp->st_stid.sc_file);
913 /* release all access and file references for a given stateid */
915 release_all_access(struct nfs4_ol_stateid *stp)
918 struct nfs4_file *fp = stp->st_stid.sc_file;
920 if (fp && stp->st_deny_bmap != 0)
921 recalculate_deny_mode(fp);
923 for (i = 1; i < 4; i++) {
924 if (test_access(i, stp))
925 nfs4_file_put_access(stp->st_stid.sc_file, i);
926 clear_access(i, stp);
930 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
932 struct nfs4_client *clp = sop->so_client;
934 might_lock(&clp->cl_lock);
936 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
938 sop->so_ops->so_unhash(sop);
939 spin_unlock(&clp->cl_lock);
940 kfree(sop->so_owner.data);
941 sop->so_ops->so_free(sop);
944 static void unhash_ol_stateid(struct nfs4_ol_stateid *stp)
946 struct nfs4_file *fp = stp->st_stid.sc_file;
948 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
950 spin_lock(&fp->fi_lock);
951 list_del(&stp->st_perfile);
952 spin_unlock(&fp->fi_lock);
953 list_del(&stp->st_perstateowner);
956 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
958 struct nfs4_ol_stateid *stp = openlockstateid(stid);
960 release_all_access(stp);
961 if (stp->st_stateowner)
962 nfs4_put_stateowner(stp->st_stateowner);
963 kmem_cache_free(stateid_slab, stid);
966 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
968 struct nfs4_ol_stateid *stp = openlockstateid(stid);
969 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
972 file = find_any_file(stp->st_stid.sc_file);
974 filp_close(file, (fl_owner_t)lo);
975 nfs4_free_ol_stateid(stid);
979 * Put the persistent reference to an already unhashed generic stateid, while
980 * holding the cl_lock. If it's the last reference, then put it onto the
981 * reaplist for later destruction.
983 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
984 struct list_head *reaplist)
986 struct nfs4_stid *s = &stp->st_stid;
987 struct nfs4_client *clp = s->sc_client;
989 lockdep_assert_held(&clp->cl_lock);
991 WARN_ON_ONCE(!list_empty(&stp->st_locks));
993 if (!atomic_dec_and_test(&s->sc_count)) {
994 wake_up_all(&close_wq);
998 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
999 list_add(&stp->st_locks, reaplist);
1002 static void unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1004 struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
1006 lockdep_assert_held(&oo->oo_owner.so_client->cl_lock);
1008 list_del_init(&stp->st_locks);
1009 unhash_ol_stateid(stp);
1010 unhash_stid(&stp->st_stid);
1013 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1015 struct nfs4_openowner *oo = openowner(stp->st_openstp->st_stateowner);
1017 spin_lock(&oo->oo_owner.so_client->cl_lock);
1018 unhash_lock_stateid(stp);
1019 spin_unlock(&oo->oo_owner.so_client->cl_lock);
1020 nfs4_put_stid(&stp->st_stid);
1023 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1025 struct nfs4_client *clp = lo->lo_owner.so_client;
1027 lockdep_assert_held(&clp->cl_lock);
1029 list_del_init(&lo->lo_owner.so_strhash);
1033 * Free a list of generic stateids that were collected earlier after being
1037 free_ol_stateid_reaplist(struct list_head *reaplist)
1039 struct nfs4_ol_stateid *stp;
1040 struct nfs4_file *fp;
1044 while (!list_empty(reaplist)) {
1045 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1047 list_del(&stp->st_locks);
1048 fp = stp->st_stid.sc_file;
1049 stp->st_stid.sc_free(&stp->st_stid);
1055 static void release_lockowner(struct nfs4_lockowner *lo)
1057 struct nfs4_client *clp = lo->lo_owner.so_client;
1058 struct nfs4_ol_stateid *stp;
1059 struct list_head reaplist;
1061 INIT_LIST_HEAD(&reaplist);
1063 spin_lock(&clp->cl_lock);
1064 unhash_lockowner_locked(lo);
1065 while (!list_empty(&lo->lo_owner.so_stateids)) {
1066 stp = list_first_entry(&lo->lo_owner.so_stateids,
1067 struct nfs4_ol_stateid, st_perstateowner);
1068 unhash_lock_stateid(stp);
1069 put_ol_stateid_locked(stp, &reaplist);
1071 spin_unlock(&clp->cl_lock);
1072 free_ol_stateid_reaplist(&reaplist);
1073 nfs4_put_stateowner(&lo->lo_owner);
1076 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1077 struct list_head *reaplist)
1079 struct nfs4_ol_stateid *stp;
1081 while (!list_empty(&open_stp->st_locks)) {
1082 stp = list_entry(open_stp->st_locks.next,
1083 struct nfs4_ol_stateid, st_locks);
1084 unhash_lock_stateid(stp);
1085 put_ol_stateid_locked(stp, reaplist);
1089 static void unhash_open_stateid(struct nfs4_ol_stateid *stp,
1090 struct list_head *reaplist)
1092 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1094 unhash_ol_stateid(stp);
1095 release_open_stateid_locks(stp, reaplist);
1098 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1100 LIST_HEAD(reaplist);
1102 spin_lock(&stp->st_stid.sc_client->cl_lock);
1103 unhash_open_stateid(stp, &reaplist);
1104 put_ol_stateid_locked(stp, &reaplist);
1105 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1106 free_ol_stateid_reaplist(&reaplist);
1109 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1111 struct nfs4_client *clp = oo->oo_owner.so_client;
1113 lockdep_assert_held(&clp->cl_lock);
1115 list_del_init(&oo->oo_owner.so_strhash);
1116 list_del_init(&oo->oo_perclient);
1119 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1121 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1123 struct nfs4_ol_stateid *s;
1125 spin_lock(&nn->client_lock);
1126 s = oo->oo_last_closed_stid;
1128 list_del_init(&oo->oo_close_lru);
1129 oo->oo_last_closed_stid = NULL;
1131 spin_unlock(&nn->client_lock);
1133 nfs4_put_stid(&s->st_stid);
1136 static void release_openowner(struct nfs4_openowner *oo)
1138 struct nfs4_ol_stateid *stp;
1139 struct nfs4_client *clp = oo->oo_owner.so_client;
1140 struct list_head reaplist;
1142 INIT_LIST_HEAD(&reaplist);
1144 spin_lock(&clp->cl_lock);
1145 unhash_openowner_locked(oo);
1146 while (!list_empty(&oo->oo_owner.so_stateids)) {
1147 stp = list_first_entry(&oo->oo_owner.so_stateids,
1148 struct nfs4_ol_stateid, st_perstateowner);
1149 unhash_open_stateid(stp, &reaplist);
1150 put_ol_stateid_locked(stp, &reaplist);
1152 spin_unlock(&clp->cl_lock);
1153 free_ol_stateid_reaplist(&reaplist);
1154 release_last_closed_stateid(oo);
1155 nfs4_put_stateowner(&oo->oo_owner);
1159 hash_sessionid(struct nfs4_sessionid *sessionid)
1161 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1163 return sid->sequence % SESSION_HASH_SIZE;
1168 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1170 u32 *ptr = (u32 *)(&sessionid->data[0]);
1171 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1175 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1181 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1182 * won't be used for replay.
1184 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1186 struct nfs4_stateowner *so = cstate->replay_owner;
1188 if (nfserr == nfserr_replay_me)
1191 if (!seqid_mutating_err(ntohl(nfserr))) {
1192 nfsd4_cstate_clear_replay(cstate);
1197 if (so->so_is_open_owner)
1198 release_last_closed_stateid(openowner(so));
1204 gen_sessionid(struct nfsd4_session *ses)
1206 struct nfs4_client *clp = ses->se_client;
1207 struct nfsd4_sessionid *sid;
1209 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1210 sid->clientid = clp->cl_clientid;
1211 sid->sequence = current_sessionid++;
1216 * The protocol defines ca_maxresponssize_cached to include the size of
1217 * the rpc header, but all we need to cache is the data starting after
1218 * the end of the initial SEQUENCE operation--the rest we regenerate
1219 * each time. Therefore we can advertise a ca_maxresponssize_cached
1220 * value that is the number of bytes in our cache plus a few additional
1221 * bytes. In order to stay on the safe side, and not promise more than
1222 * we can cache, those additional bytes must be the minimum possible: 24
1223 * bytes of rpc header (xid through accept state, with AUTH_NULL
1224 * verifier), 12 for the compound header (with zero-length tag), and 44
1225 * for the SEQUENCE op response:
1227 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1230 free_session_slots(struct nfsd4_session *ses)
1234 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
1235 kfree(ses->se_slots[i]);
1239 * We don't actually need to cache the rpc and session headers, so we
1240 * can allocate a little less for each slot:
1242 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1246 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1249 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1250 return size + sizeof(struct nfsd4_slot);
1254 * XXX: If we run out of reserved DRC memory we could (up to a point)
1255 * re-negotiate active sessions and reduce their slot usage to make
1256 * room for new connections. For now we just fail the create session.
1258 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1260 u32 slotsize = slot_bytes(ca);
1261 u32 num = ca->maxreqs;
1264 spin_lock(&nfsd_drc_lock);
1265 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1266 nfsd_drc_max_mem - nfsd_drc_mem_used);
1267 num = min_t(int, num, avail / slotsize);
1268 nfsd_drc_mem_used += num * slotsize;
1269 spin_unlock(&nfsd_drc_lock);
1274 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1276 int slotsize = slot_bytes(ca);
1278 spin_lock(&nfsd_drc_lock);
1279 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1280 spin_unlock(&nfsd_drc_lock);
1283 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1284 struct nfsd4_channel_attrs *battrs)
1286 int numslots = fattrs->maxreqs;
1287 int slotsize = slot_bytes(fattrs);
1288 struct nfsd4_session *new;
1291 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1292 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1293 mem = numslots * sizeof(struct nfsd4_slot *);
1295 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1298 /* allocate each struct nfsd4_slot and data cache in one piece */
1299 for (i = 0; i < numslots; i++) {
1300 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1301 if (!new->se_slots[i])
1305 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1306 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1311 kfree(new->se_slots[i]);
1316 static void free_conn(struct nfsd4_conn *c)
1318 svc_xprt_put(c->cn_xprt);
1322 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1324 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1325 struct nfs4_client *clp = c->cn_session->se_client;
1327 spin_lock(&clp->cl_lock);
1328 if (!list_empty(&c->cn_persession)) {
1329 list_del(&c->cn_persession);
1332 nfsd4_probe_callback(clp);
1333 spin_unlock(&clp->cl_lock);
1336 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1338 struct nfsd4_conn *conn;
1340 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1343 svc_xprt_get(rqstp->rq_xprt);
1344 conn->cn_xprt = rqstp->rq_xprt;
1345 conn->cn_flags = flags;
1346 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1350 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1352 conn->cn_session = ses;
1353 list_add(&conn->cn_persession, &ses->se_conns);
1356 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1358 struct nfs4_client *clp = ses->se_client;
1360 spin_lock(&clp->cl_lock);
1361 __nfsd4_hash_conn(conn, ses);
1362 spin_unlock(&clp->cl_lock);
1365 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1367 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1368 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1371 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1375 nfsd4_hash_conn(conn, ses);
1376 ret = nfsd4_register_conn(conn);
1378 /* oops; xprt is already down: */
1379 nfsd4_conn_lost(&conn->cn_xpt_user);
1380 /* We may have gained or lost a callback channel: */
1381 nfsd4_probe_callback_sync(ses->se_client);
1384 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1386 u32 dir = NFS4_CDFC4_FORE;
1388 if (cses->flags & SESSION4_BACK_CHAN)
1389 dir |= NFS4_CDFC4_BACK;
1390 return alloc_conn(rqstp, dir);
1393 /* must be called under client_lock */
1394 static void nfsd4_del_conns(struct nfsd4_session *s)
1396 struct nfs4_client *clp = s->se_client;
1397 struct nfsd4_conn *c;
1399 spin_lock(&clp->cl_lock);
1400 while (!list_empty(&s->se_conns)) {
1401 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1402 list_del_init(&c->cn_persession);
1403 spin_unlock(&clp->cl_lock);
1405 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1408 spin_lock(&clp->cl_lock);
1410 spin_unlock(&clp->cl_lock);
1413 static void __free_session(struct nfsd4_session *ses)
1415 free_session_slots(ses);
1419 static void free_session(struct nfsd4_session *ses)
1421 nfsd4_del_conns(ses);
1422 nfsd4_put_drc_mem(&ses->se_fchannel);
1423 __free_session(ses);
1426 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1429 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1431 new->se_client = clp;
1434 INIT_LIST_HEAD(&new->se_conns);
1436 new->se_cb_seq_nr = 1;
1437 new->se_flags = cses->flags;
1438 new->se_cb_prog = cses->callback_prog;
1439 new->se_cb_sec = cses->cb_sec;
1440 atomic_set(&new->se_ref, 0);
1441 idx = hash_sessionid(&new->se_sessionid);
1442 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1443 spin_lock(&clp->cl_lock);
1444 list_add(&new->se_perclnt, &clp->cl_sessions);
1445 spin_unlock(&clp->cl_lock);
1447 if (cses->flags & SESSION4_BACK_CHAN) {
1448 struct sockaddr *sa = svc_addr(rqstp);
1450 * This is a little silly; with sessions there's no real
1451 * use for the callback address. Use the peer address
1452 * as a reasonable default for now, but consider fixing
1453 * the rpc client not to require an address in the
1456 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1457 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1461 /* caller must hold client_lock */
1462 static struct nfsd4_session *
1463 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1465 struct nfsd4_session *elem;
1467 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1469 lockdep_assert_held(&nn->client_lock);
1471 dump_sessionid(__func__, sessionid);
1472 idx = hash_sessionid(sessionid);
1473 /* Search in the appropriate list */
1474 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1475 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1476 NFS4_MAX_SESSIONID_LEN)) {
1481 dprintk("%s: session not found\n", __func__);
1485 static struct nfsd4_session *
1486 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1489 struct nfsd4_session *session;
1490 __be32 status = nfserr_badsession;
1492 session = __find_in_sessionid_hashtbl(sessionid, net);
1495 status = nfsd4_get_session_locked(session);
1503 /* caller must hold client_lock */
1505 unhash_session(struct nfsd4_session *ses)
1507 struct nfs4_client *clp = ses->se_client;
1508 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1510 lockdep_assert_held(&nn->client_lock);
1512 list_del(&ses->se_hash);
1513 spin_lock(&ses->se_client->cl_lock);
1514 list_del(&ses->se_perclnt);
1515 spin_unlock(&ses->se_client->cl_lock);
1518 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1520 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1522 if (clid->cl_boot == nn->boot_time)
1524 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1525 clid->cl_boot, clid->cl_id, nn->boot_time);
1530 * XXX Should we use a slab cache ?
1531 * This type of memory management is somewhat inefficient, but we use it
1532 * anyway since SETCLIENTID is not a common operation.
1534 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1536 struct nfs4_client *clp;
1539 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1542 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1543 if (clp->cl_name.data == NULL)
1545 clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1546 OWNER_HASH_SIZE, GFP_KERNEL);
1547 if (!clp->cl_ownerstr_hashtbl)
1548 goto err_no_hashtbl;
1549 for (i = 0; i < OWNER_HASH_SIZE; i++)
1550 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1551 clp->cl_name.len = name.len;
1552 INIT_LIST_HEAD(&clp->cl_sessions);
1553 idr_init(&clp->cl_stateids);
1554 atomic_set(&clp->cl_refcount, 0);
1555 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1556 INIT_LIST_HEAD(&clp->cl_idhash);
1557 INIT_LIST_HEAD(&clp->cl_openowners);
1558 INIT_LIST_HEAD(&clp->cl_delegations);
1559 INIT_LIST_HEAD(&clp->cl_lru);
1560 INIT_LIST_HEAD(&clp->cl_callbacks);
1561 INIT_LIST_HEAD(&clp->cl_revoked);
1562 spin_lock_init(&clp->cl_lock);
1563 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1566 kfree(clp->cl_name.data);
1573 free_client(struct nfs4_client *clp)
1575 while (!list_empty(&clp->cl_sessions)) {
1576 struct nfsd4_session *ses;
1577 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1579 list_del(&ses->se_perclnt);
1580 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1583 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1584 free_svc_cred(&clp->cl_cred);
1585 kfree(clp->cl_ownerstr_hashtbl);
1586 kfree(clp->cl_name.data);
1587 idr_destroy(&clp->cl_stateids);
1591 /* must be called under the client_lock */
1593 unhash_client_locked(struct nfs4_client *clp)
1595 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1596 struct nfsd4_session *ses;
1598 lockdep_assert_held(&nn->client_lock);
1600 /* Mark the client as expired! */
1602 /* Make it invisible */
1603 if (!list_empty(&clp->cl_idhash)) {
1604 list_del_init(&clp->cl_idhash);
1605 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1606 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1608 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1610 list_del_init(&clp->cl_lru);
1611 spin_lock(&clp->cl_lock);
1612 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1613 list_del_init(&ses->se_hash);
1614 spin_unlock(&clp->cl_lock);
1618 unhash_client(struct nfs4_client *clp)
1620 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1622 spin_lock(&nn->client_lock);
1623 unhash_client_locked(clp);
1624 spin_unlock(&nn->client_lock);
1627 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1629 if (atomic_read(&clp->cl_refcount))
1630 return nfserr_jukebox;
1631 unhash_client_locked(clp);
1636 __destroy_client(struct nfs4_client *clp)
1638 struct nfs4_openowner *oo;
1639 struct nfs4_delegation *dp;
1640 struct list_head reaplist;
1642 INIT_LIST_HEAD(&reaplist);
1643 spin_lock(&state_lock);
1644 while (!list_empty(&clp->cl_delegations)) {
1645 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1646 unhash_delegation_locked(dp);
1647 list_add(&dp->dl_recall_lru, &reaplist);
1649 spin_unlock(&state_lock);
1650 while (!list_empty(&reaplist)) {
1651 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1652 list_del_init(&dp->dl_recall_lru);
1653 nfs4_put_stid(&dp->dl_stid);
1655 while (!list_empty(&clp->cl_revoked)) {
1656 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1657 list_del_init(&dp->dl_recall_lru);
1658 nfs4_put_stid(&dp->dl_stid);
1660 while (!list_empty(&clp->cl_openowners)) {
1661 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1662 atomic_inc(&oo->oo_owner.so_count);
1663 release_openowner(oo);
1665 nfsd4_shutdown_callback(clp);
1666 if (clp->cl_cb_conn.cb_xprt)
1667 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1672 destroy_client(struct nfs4_client *clp)
1675 __destroy_client(clp);
1678 static void expire_client(struct nfs4_client *clp)
1681 nfsd4_client_record_remove(clp);
1682 __destroy_client(clp);
1685 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1687 memcpy(target->cl_verifier.data, source->data,
1688 sizeof(target->cl_verifier.data));
1691 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1693 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1694 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1697 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1699 if (source->cr_principal) {
1700 target->cr_principal =
1701 kstrdup(source->cr_principal, GFP_KERNEL);
1702 if (target->cr_principal == NULL)
1705 target->cr_principal = NULL;
1706 target->cr_flavor = source->cr_flavor;
1707 target->cr_uid = source->cr_uid;
1708 target->cr_gid = source->cr_gid;
1709 target->cr_group_info = source->cr_group_info;
1710 get_group_info(target->cr_group_info);
1711 target->cr_gss_mech = source->cr_gss_mech;
1712 if (source->cr_gss_mech)
1713 gss_mech_get(source->cr_gss_mech);
1718 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1722 res = o1->len - o2->len;
1725 return (long long)memcmp(o1->data, o2->data, o1->len);
1728 static int same_name(const char *n1, const char *n2)
1730 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1734 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1736 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1740 same_clid(clientid_t *cl1, clientid_t *cl2)
1742 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1745 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1749 if (g1->ngroups != g2->ngroups)
1751 for (i=0; i<g1->ngroups; i++)
1752 if (!gid_eq(GROUP_AT(g1, i), GROUP_AT(g2, i)))
1758 * RFC 3530 language requires clid_inuse be returned when the
1759 * "principal" associated with a requests differs from that previously
1760 * used. We use uid, gid's, and gss principal string as our best
1761 * approximation. We also don't want to allow non-gss use of a client
1762 * established using gss: in theory cr_principal should catch that
1763 * change, but in practice cr_principal can be null even in the gss case
1764 * since gssd doesn't always pass down a principal string.
1766 static bool is_gss_cred(struct svc_cred *cr)
1768 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1769 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
1774 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
1776 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
1777 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
1778 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
1779 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
1781 if (cr1->cr_principal == cr2->cr_principal)
1783 if (!cr1->cr_principal || !cr2->cr_principal)
1785 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
1788 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
1790 struct svc_cred *cr = &rqstp->rq_cred;
1793 if (!cr->cr_gss_mech)
1795 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
1796 return service == RPC_GSS_SVC_INTEGRITY ||
1797 service == RPC_GSS_SVC_PRIVACY;
1800 static bool mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
1802 struct svc_cred *cr = &rqstp->rq_cred;
1804 if (!cl->cl_mach_cred)
1806 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
1808 if (!svc_rqst_integrity_protected(rqstp))
1810 if (!cr->cr_principal)
1812 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
1815 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
1820 * This is opaque to client, so no need to byte-swap. Use
1821 * __force to keep sparse happy
1823 verf[0] = (__force __be32)get_seconds();
1824 verf[1] = (__force __be32)nn->clientid_counter;
1825 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
1828 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
1830 clp->cl_clientid.cl_boot = nn->boot_time;
1831 clp->cl_clientid.cl_id = nn->clientid_counter++;
1832 gen_confirm(clp, nn);
1835 static struct nfs4_stid *
1836 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
1838 struct nfs4_stid *ret;
1840 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
1841 if (!ret || !ret->sc_type)
1846 static struct nfs4_stid *
1847 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
1849 struct nfs4_stid *s;
1851 spin_lock(&cl->cl_lock);
1852 s = find_stateid_locked(cl, t);
1854 if (typemask & s->sc_type)
1855 atomic_inc(&s->sc_count);
1859 spin_unlock(&cl->cl_lock);
1863 static struct nfs4_client *create_client(struct xdr_netobj name,
1864 struct svc_rqst *rqstp, nfs4_verifier *verf)
1866 struct nfs4_client *clp;
1867 struct sockaddr *sa = svc_addr(rqstp);
1869 struct net *net = SVC_NET(rqstp);
1871 clp = alloc_client(name);
1875 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
1880 INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_run_cb_null);
1881 clp->cl_time = get_seconds();
1882 clear_bit(0, &clp->cl_cb_slot_busy);
1883 copy_verf(clp, verf);
1884 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
1885 clp->cl_cb_session = NULL;
1891 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
1893 struct rb_node **new = &(root->rb_node), *parent = NULL;
1894 struct nfs4_client *clp;
1897 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
1900 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
1901 new = &((*new)->rb_left);
1903 new = &((*new)->rb_right);
1906 rb_link_node(&new_clp->cl_namenode, parent, new);
1907 rb_insert_color(&new_clp->cl_namenode, root);
1910 static struct nfs4_client *
1911 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
1914 struct rb_node *node = root->rb_node;
1915 struct nfs4_client *clp;
1918 clp = rb_entry(node, struct nfs4_client, cl_namenode);
1919 cmp = compare_blob(&clp->cl_name, name);
1921 node = node->rb_left;
1923 node = node->rb_right;
1931 add_to_unconfirmed(struct nfs4_client *clp)
1933 unsigned int idhashval;
1934 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1936 lockdep_assert_held(&nn->client_lock);
1938 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1939 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
1940 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1941 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
1942 renew_client_locked(clp);
1946 move_to_confirmed(struct nfs4_client *clp)
1948 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
1949 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1951 lockdep_assert_held(&nn->client_lock);
1953 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
1954 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
1955 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1956 add_clp_to_name_tree(clp, &nn->conf_name_tree);
1957 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
1958 renew_client_locked(clp);
1961 static struct nfs4_client *
1962 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
1964 struct nfs4_client *clp;
1965 unsigned int idhashval = clientid_hashval(clid->cl_id);
1967 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
1968 if (same_clid(&clp->cl_clientid, clid)) {
1969 if ((bool)clp->cl_minorversion != sessions)
1971 renew_client_locked(clp);
1978 static struct nfs4_client *
1979 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1981 struct list_head *tbl = nn->conf_id_hashtbl;
1983 lockdep_assert_held(&nn->client_lock);
1984 return find_client_in_id_table(tbl, clid, sessions);
1987 static struct nfs4_client *
1988 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
1990 struct list_head *tbl = nn->unconf_id_hashtbl;
1992 lockdep_assert_held(&nn->client_lock);
1993 return find_client_in_id_table(tbl, clid, sessions);
1996 static bool clp_used_exchangeid(struct nfs4_client *clp)
1998 return clp->cl_exchange_flags != 0;
2001 static struct nfs4_client *
2002 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2004 lockdep_assert_held(&nn->client_lock);
2005 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2008 static struct nfs4_client *
2009 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2011 lockdep_assert_held(&nn->client_lock);
2012 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2016 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2018 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2019 struct sockaddr *sa = svc_addr(rqstp);
2020 u32 scopeid = rpc_get_scope_id(sa);
2021 unsigned short expected_family;
2023 /* Currently, we only support tcp and tcp6 for the callback channel */
2024 if (se->se_callback_netid_len == 3 &&
2025 !memcmp(se->se_callback_netid_val, "tcp", 3))
2026 expected_family = AF_INET;
2027 else if (se->se_callback_netid_len == 4 &&
2028 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2029 expected_family = AF_INET6;
2033 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2034 se->se_callback_addr_len,
2035 (struct sockaddr *)&conn->cb_addr,
2036 sizeof(conn->cb_addr));
2038 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2041 if (conn->cb_addr.ss_family == AF_INET6)
2042 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2044 conn->cb_prog = se->se_callback_prog;
2045 conn->cb_ident = se->se_callback_ident;
2046 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2049 conn->cb_addr.ss_family = AF_UNSPEC;
2050 conn->cb_addrlen = 0;
2051 dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
2052 "will not receive delegations\n",
2053 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2059 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2062 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2064 struct xdr_buf *buf = resp->xdr.buf;
2065 struct nfsd4_slot *slot = resp->cstate.slot;
2068 dprintk("--> %s slot %p\n", __func__, slot);
2070 slot->sl_opcnt = resp->opcnt;
2071 slot->sl_status = resp->cstate.status;
2073 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2074 if (nfsd4_not_cached(resp)) {
2075 slot->sl_datalen = 0;
2078 base = resp->cstate.data_offset;
2079 slot->sl_datalen = buf->len - base;
2080 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2081 WARN("%s: sessions DRC could not cache compound\n", __func__);
2086 * Encode the replay sequence operation from the slot values.
2087 * If cachethis is FALSE encode the uncached rep error on the next
2088 * operation which sets resp->p and increments resp->opcnt for
2089 * nfs4svc_encode_compoundres.
2093 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2094 struct nfsd4_compoundres *resp)
2096 struct nfsd4_op *op;
2097 struct nfsd4_slot *slot = resp->cstate.slot;
2099 /* Encode the replayed sequence operation */
2100 op = &args->ops[resp->opcnt - 1];
2101 nfsd4_encode_operation(resp, op);
2103 /* Return nfserr_retry_uncached_rep in next operation. */
2104 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
2105 op = &args->ops[resp->opcnt++];
2106 op->status = nfserr_retry_uncached_rep;
2107 nfsd4_encode_operation(resp, op);
2113 * The sequence operation is not cached because we can use the slot and
2117 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2118 struct nfsd4_sequence *seq)
2120 struct nfsd4_slot *slot = resp->cstate.slot;
2121 struct xdr_stream *xdr = &resp->xdr;
2125 dprintk("--> %s slot %p\n", __func__, slot);
2127 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2131 p = xdr_reserve_space(xdr, slot->sl_datalen);
2134 return nfserr_serverfault;
2136 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2137 xdr_commit_encode(xdr);
2139 resp->opcnt = slot->sl_opcnt;
2140 return slot->sl_status;
2144 * Set the exchange_id flags returned by the server.
2147 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2149 /* pNFS is not supported */
2150 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2152 /* Referrals are supported, Migration is not. */
2153 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2155 /* set the wire flags to return to client. */
2156 clid->flags = new->cl_exchange_flags;
2159 static bool client_has_state(struct nfs4_client *clp)
2162 * Note clp->cl_openowners check isn't quite right: there's no
2163 * need to count owners without stateid's.
2165 * Also note we should probably be using this in 4.0 case too.
2167 return !list_empty(&clp->cl_openowners)
2168 || !list_empty(&clp->cl_delegations)
2169 || !list_empty(&clp->cl_sessions);
2173 nfsd4_exchange_id(struct svc_rqst *rqstp,
2174 struct nfsd4_compound_state *cstate,
2175 struct nfsd4_exchange_id *exid)
2177 struct nfs4_client *conf, *new;
2178 struct nfs4_client *unconf = NULL;
2180 char addr_str[INET6_ADDRSTRLEN];
2181 nfs4_verifier verf = exid->verifier;
2182 struct sockaddr *sa = svc_addr(rqstp);
2183 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2184 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2186 rpc_ntop(sa, addr_str, sizeof(addr_str));
2187 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2188 "ip_addr=%s flags %x, spa_how %d\n",
2189 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2190 addr_str, exid->flags, exid->spa_how);
2192 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2193 return nfserr_inval;
2195 switch (exid->spa_how) {
2197 if (!svc_rqst_integrity_protected(rqstp))
2198 return nfserr_inval;
2201 default: /* checked by xdr code */
2204 return nfserr_encr_alg_unsupp;
2207 new = create_client(exid->clname, rqstp, &verf);
2209 return nfserr_jukebox;
2211 /* Cases below refer to rfc 5661 section 18.35.4: */
2213 spin_lock(&nn->client_lock);
2214 conf = find_confirmed_client_by_name(&exid->clname, nn);
2216 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2217 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2220 if (!clp_used_exchangeid(conf)) { /* buggy client */
2221 status = nfserr_inval;
2224 if (!mach_creds_match(conf, rqstp)) {
2225 status = nfserr_wrong_cred;
2228 if (!creds_match) { /* case 9 */
2229 status = nfserr_perm;
2232 if (!verfs_match) { /* case 8 */
2233 status = nfserr_not_same;
2237 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2240 if (!creds_match) { /* case 3 */
2241 if (client_has_state(conf)) {
2242 status = nfserr_clid_inuse;
2247 if (verfs_match) { /* case 2 */
2248 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2251 /* case 5, client reboot */
2256 if (update) { /* case 7 */
2257 status = nfserr_noent;
2261 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
2262 if (unconf) /* case 4, possible retry or client restart */
2263 unhash_client_locked(unconf);
2265 /* case 1 (normal case) */
2268 status = mark_client_expired_locked(conf);
2272 new->cl_minorversion = cstate->minorversion;
2273 new->cl_mach_cred = (exid->spa_how == SP4_MACH_CRED);
2276 add_to_unconfirmed(new);
2279 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2280 exid->clientid.cl_id = conf->cl_clientid.cl_id;
2282 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2283 nfsd4_set_ex_flags(conf, exid);
2285 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2286 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2290 spin_unlock(&nn->client_lock);
2291 nfs4_unlock_state();
2295 expire_client(unconf);
2300 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2302 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2305 /* The slot is in use, and no response has been sent. */
2307 if (seqid == slot_seqid)
2308 return nfserr_jukebox;
2310 return nfserr_seq_misordered;
2312 /* Note unsigned 32-bit arithmetic handles wraparound: */
2313 if (likely(seqid == slot_seqid + 1))
2315 if (seqid == slot_seqid)
2316 return nfserr_replay_cache;
2317 return nfserr_seq_misordered;
2321 * Cache the create session result into the create session single DRC
2322 * slot cache by saving the xdr structure. sl_seqid has been set.
2323 * Do this for solo or embedded create session operations.
2326 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2327 struct nfsd4_clid_slot *slot, __be32 nfserr)
2329 slot->sl_status = nfserr;
2330 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2334 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2335 struct nfsd4_clid_slot *slot)
2337 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2338 return slot->sl_status;
2341 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2342 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2343 1 + /* MIN tag is length with zero, only length */ \
2344 3 + /* version, opcount, opcode */ \
2345 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2346 /* seqid, slotID, slotID, cache */ \
2347 4 ) * sizeof(__be32))
2349 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2350 2 + /* verifier: AUTH_NULL, length 0 */\
2352 1 + /* MIN tag is length with zero, only length */ \
2353 3 + /* opcount, opcode, opstatus*/ \
2354 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2355 /* seqid, slotID, slotID, slotID, status */ \
2356 5 ) * sizeof(__be32))
2358 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2360 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2362 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2363 return nfserr_toosmall;
2364 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2365 return nfserr_toosmall;
2366 ca->headerpadsz = 0;
2367 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2368 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2369 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2370 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2371 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2372 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2374 * Note decreasing slot size below client's request may make it
2375 * difficult for client to function correctly, whereas
2376 * decreasing the number of slots will (just?) affect
2377 * performance. When short on memory we therefore prefer to
2378 * decrease number of slots instead of their size. Clients that
2379 * request larger slots than they need will get poor results:
2381 ca->maxreqs = nfsd4_get_drc_mem(ca);
2383 return nfserr_jukebox;
2388 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2389 RPC_MAX_HEADER_WITH_AUTH) * sizeof(__be32))
2390 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2391 RPC_MAX_REPHEADER_WITH_AUTH) * sizeof(__be32))
2393 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2395 ca->headerpadsz = 0;
2398 * These RPC_MAX_HEADER macros are overkill, especially since we
2399 * don't even do gss on the backchannel yet. But this is still
2400 * less than 1k. Tighten up this estimate in the unlikely event
2401 * it turns out to be a problem for some client:
2403 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2404 return nfserr_toosmall;
2405 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2406 return nfserr_toosmall;
2407 ca->maxresp_cached = 0;
2409 return nfserr_toosmall;
2414 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2416 switch (cbs->flavor) {
2422 * GSS case: the spec doesn't allow us to return this
2423 * error. But it also doesn't allow us not to support
2425 * I'd rather this fail hard than return some error the
2426 * client might think it can already handle:
2428 return nfserr_encr_alg_unsupp;
2433 nfsd4_create_session(struct svc_rqst *rqstp,
2434 struct nfsd4_compound_state *cstate,
2435 struct nfsd4_create_session *cr_ses)
2437 struct sockaddr *sa = svc_addr(rqstp);
2438 struct nfs4_client *conf, *unconf;
2439 struct nfs4_client *old = NULL;
2440 struct nfsd4_session *new;
2441 struct nfsd4_conn *conn;
2442 struct nfsd4_clid_slot *cs_slot = NULL;
2444 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2446 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2447 return nfserr_inval;
2448 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2451 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2454 status = check_backchannel_attrs(&cr_ses->back_channel);
2456 goto out_release_drc_mem;
2457 status = nfserr_jukebox;
2458 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2460 goto out_release_drc_mem;
2461 conn = alloc_conn_from_crses(rqstp, cr_ses);
2463 goto out_free_session;
2466 spin_lock(&nn->client_lock);
2467 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2468 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2469 WARN_ON_ONCE(conf && unconf);
2472 status = nfserr_wrong_cred;
2473 if (!mach_creds_match(conf, rqstp))
2475 cs_slot = &conf->cl_cs_slot;
2476 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2477 if (status == nfserr_replay_cache) {
2478 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2480 } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
2481 status = nfserr_seq_misordered;
2484 } else if (unconf) {
2485 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2486 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2487 status = nfserr_clid_inuse;
2490 status = nfserr_wrong_cred;
2491 if (!mach_creds_match(unconf, rqstp))
2493 cs_slot = &unconf->cl_cs_slot;
2494 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2496 /* an unconfirmed replay returns misordered */
2497 status = nfserr_seq_misordered;
2500 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2502 status = mark_client_expired_locked(old);
2508 move_to_confirmed(unconf);
2511 status = nfserr_stale_clientid;
2516 * We do not support RDMA or persistent sessions
2518 cr_ses->flags &= ~SESSION4_PERSIST;
2519 cr_ses->flags &= ~SESSION4_RDMA;
2521 init_session(rqstp, new, conf, cr_ses);
2522 nfsd4_get_session_locked(new);
2524 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2525 NFS4_MAX_SESSIONID_LEN);
2526 cs_slot->sl_seqid++;
2527 cr_ses->seqid = cs_slot->sl_seqid;
2529 /* cache solo and embedded create sessions under the client_lock */
2530 nfsd4_cache_create_session(cr_ses, cs_slot, status);
2531 spin_unlock(&nn->client_lock);
2532 /* init connection and backchannel */
2533 nfsd4_init_conn(rqstp, conn, new);
2534 nfsd4_put_session(new);
2535 nfs4_unlock_state();
2540 spin_unlock(&nn->client_lock);
2541 nfs4_unlock_state();
2546 __free_session(new);
2547 out_release_drc_mem:
2548 nfsd4_put_drc_mem(&cr_ses->fore_channel);
2552 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2555 case NFS4_CDFC4_FORE:
2556 case NFS4_CDFC4_BACK:
2558 case NFS4_CDFC4_FORE_OR_BOTH:
2559 case NFS4_CDFC4_BACK_OR_BOTH:
2560 *dir = NFS4_CDFC4_BOTH;
2563 return nfserr_inval;
2566 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2568 struct nfsd4_session *session = cstate->session;
2569 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2572 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2575 spin_lock(&nn->client_lock);
2576 session->se_cb_prog = bc->bc_cb_program;
2577 session->se_cb_sec = bc->bc_cb_sec;
2578 spin_unlock(&nn->client_lock);
2580 nfsd4_probe_callback(session->se_client);
2585 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2586 struct nfsd4_compound_state *cstate,
2587 struct nfsd4_bind_conn_to_session *bcts)
2590 struct nfsd4_conn *conn;
2591 struct nfsd4_session *session;
2592 struct net *net = SVC_NET(rqstp);
2593 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2595 if (!nfsd4_last_compound_op(rqstp))
2596 return nfserr_not_only_op;
2598 spin_lock(&nn->client_lock);
2599 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2600 spin_unlock(&nn->client_lock);
2602 goto out_no_session;
2603 status = nfserr_wrong_cred;
2604 if (!mach_creds_match(session->se_client, rqstp))
2606 status = nfsd4_map_bcts_dir(&bcts->dir);
2609 conn = alloc_conn(rqstp, bcts->dir);
2610 status = nfserr_jukebox;
2613 nfsd4_init_conn(rqstp, conn, session);
2616 nfsd4_put_session(session);
2618 nfs4_unlock_state();
2622 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2626 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2630 nfsd4_destroy_session(struct svc_rqst *r,
2631 struct nfsd4_compound_state *cstate,
2632 struct nfsd4_destroy_session *sessionid)
2634 struct nfsd4_session *ses;
2636 int ref_held_by_me = 0;
2637 struct net *net = SVC_NET(r);
2638 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2641 status = nfserr_not_only_op;
2642 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2643 if (!nfsd4_last_compound_op(r))
2647 dump_sessionid(__func__, &sessionid->sessionid);
2648 spin_lock(&nn->client_lock);
2649 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2651 goto out_client_lock;
2652 status = nfserr_wrong_cred;
2653 if (!mach_creds_match(ses->se_client, r))
2654 goto out_put_session;
2655 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2657 goto out_put_session;
2658 unhash_session(ses);
2659 spin_unlock(&nn->client_lock);
2661 nfsd4_probe_callback_sync(ses->se_client);
2663 spin_lock(&nn->client_lock);
2666 nfsd4_put_session_locked(ses);
2668 spin_unlock(&nn->client_lock);
2670 nfs4_unlock_state();
2674 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2676 struct nfsd4_conn *c;
2678 list_for_each_entry(c, &s->se_conns, cn_persession) {
2679 if (c->cn_xprt == xpt) {
2686 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2688 struct nfs4_client *clp = ses->se_client;
2689 struct nfsd4_conn *c;
2690 __be32 status = nfs_ok;
2693 spin_lock(&clp->cl_lock);
2694 c = __nfsd4_find_conn(new->cn_xprt, ses);
2697 status = nfserr_conn_not_bound_to_session;
2698 if (clp->cl_mach_cred)
2700 __nfsd4_hash_conn(new, ses);
2701 spin_unlock(&clp->cl_lock);
2702 ret = nfsd4_register_conn(new);
2704 /* oops; xprt is already down: */
2705 nfsd4_conn_lost(&new->cn_xpt_user);
2708 spin_unlock(&clp->cl_lock);
2713 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2715 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2717 return args->opcnt > session->se_fchannel.maxops;
2720 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2721 struct nfsd4_session *session)
2723 struct xdr_buf *xb = &rqstp->rq_arg;
2725 return xb->len > session->se_fchannel.maxreq_sz;
2729 nfsd4_sequence(struct svc_rqst *rqstp,
2730 struct nfsd4_compound_state *cstate,
2731 struct nfsd4_sequence *seq)
2733 struct nfsd4_compoundres *resp = rqstp->rq_resp;
2734 struct xdr_stream *xdr = &resp->xdr;
2735 struct nfsd4_session *session;
2736 struct nfs4_client *clp;
2737 struct nfsd4_slot *slot;
2738 struct nfsd4_conn *conn;
2741 struct net *net = SVC_NET(rqstp);
2742 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2744 if (resp->opcnt != 1)
2745 return nfserr_sequence_pos;
2748 * Will be either used or freed by nfsd4_sequence_check_conn
2751 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
2753 return nfserr_jukebox;
2755 spin_lock(&nn->client_lock);
2756 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
2758 goto out_no_session;
2759 clp = session->se_client;
2761 status = nfserr_too_many_ops;
2762 if (nfsd4_session_too_many_ops(rqstp, session))
2763 goto out_put_session;
2765 status = nfserr_req_too_big;
2766 if (nfsd4_request_too_big(rqstp, session))
2767 goto out_put_session;
2769 status = nfserr_badslot;
2770 if (seq->slotid >= session->se_fchannel.maxreqs)
2771 goto out_put_session;
2773 slot = session->se_slots[seq->slotid];
2774 dprintk("%s: slotid %d\n", __func__, seq->slotid);
2776 /* We do not negotiate the number of slots yet, so set the
2777 * maxslots to the session maxreqs which is used to encode
2778 * sr_highest_slotid and the sr_target_slot id to maxslots */
2779 seq->maxslots = session->se_fchannel.maxreqs;
2781 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
2782 slot->sl_flags & NFSD4_SLOT_INUSE);
2783 if (status == nfserr_replay_cache) {
2784 status = nfserr_seq_misordered;
2785 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
2786 goto out_put_session;
2787 cstate->slot = slot;
2788 cstate->session = session;
2790 /* Return the cached reply status and set cstate->status
2791 * for nfsd4_proc_compound processing */
2792 status = nfsd4_replay_cache_entry(resp, seq);
2793 cstate->status = nfserr_replay_cache;
2797 goto out_put_session;
2799 status = nfsd4_sequence_check_conn(conn, session);
2802 goto out_put_session;
2804 buflen = (seq->cachethis) ?
2805 session->se_fchannel.maxresp_cached :
2806 session->se_fchannel.maxresp_sz;
2807 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
2809 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
2810 goto out_put_session;
2811 svc_reserve(rqstp, buflen);
2814 /* Success! bump slot seqid */
2815 slot->sl_seqid = seq->seqid;
2816 slot->sl_flags |= NFSD4_SLOT_INUSE;
2818 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
2820 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
2822 cstate->slot = slot;
2823 cstate->session = session;
2827 switch (clp->cl_cb_state) {
2829 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
2831 case NFSD4_CB_FAULT:
2832 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
2835 seq->status_flags = 0;
2837 if (!list_empty(&clp->cl_revoked))
2838 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
2842 spin_unlock(&nn->client_lock);
2845 nfsd4_put_session_locked(session);
2846 goto out_no_session;
2850 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
2852 struct nfsd4_compound_state *cs = &resp->cstate;
2854 if (nfsd4_has_session(cs)) {
2855 if (cs->status != nfserr_replay_cache) {
2856 nfsd4_store_cache_entry(resp);
2857 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
2859 /* Drop session reference that was taken in nfsd4_sequence() */
2860 nfsd4_put_session(cs->session);
2862 put_client_renew(cs->clp);
2866 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
2868 struct nfs4_client *conf, *unconf;
2869 struct nfs4_client *clp = NULL;
2871 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2874 spin_lock(&nn->client_lock);
2875 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
2876 conf = find_confirmed_client(&dc->clientid, true, nn);
2877 WARN_ON_ONCE(conf && unconf);
2880 if (client_has_state(conf)) {
2881 status = nfserr_clientid_busy;
2884 status = mark_client_expired_locked(conf);
2891 status = nfserr_stale_clientid;
2894 if (!mach_creds_match(clp, rqstp)) {
2896 status = nfserr_wrong_cred;
2899 unhash_client_locked(clp);
2901 spin_unlock(&nn->client_lock);
2902 nfs4_unlock_state();
2909 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
2913 if (rc->rca_one_fs) {
2914 if (!cstate->current_fh.fh_dentry)
2915 return nfserr_nofilehandle;
2917 * We don't take advantage of the rca_one_fs case.
2918 * That's OK, it's optional, we can safely ignore it.
2924 status = nfserr_complete_already;
2925 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
2926 &cstate->session->se_client->cl_flags))
2929 status = nfserr_stale_clientid;
2930 if (is_client_expired(cstate->session->se_client))
2932 * The following error isn't really legal.
2933 * But we only get here if the client just explicitly
2934 * destroyed the client. Surely it no longer cares what
2935 * error it gets back on an operation for the dead
2941 nfsd4_client_record_create(cstate->session->se_client);
2943 nfs4_unlock_state();
2948 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2949 struct nfsd4_setclientid *setclid)
2951 struct xdr_netobj clname = setclid->se_name;
2952 nfs4_verifier clverifier = setclid->se_verf;
2953 struct nfs4_client *conf, *new;
2954 struct nfs4_client *unconf = NULL;
2956 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2958 new = create_client(clname, rqstp, &clverifier);
2960 return nfserr_jukebox;
2961 /* Cases below refer to rfc 3530 section 14.2.33: */
2963 spin_lock(&nn->client_lock);
2964 conf = find_confirmed_client_by_name(&clname, nn);
2967 status = nfserr_clid_inuse;
2968 if (clp_used_exchangeid(conf))
2970 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
2971 char addr_str[INET6_ADDRSTRLEN];
2972 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
2974 dprintk("NFSD: setclientid: string in use by client "
2975 "at %s\n", addr_str);
2979 unconf = find_unconfirmed_client_by_name(&clname, nn);
2981 unhash_client_locked(unconf);
2982 if (conf && same_verf(&conf->cl_verifier, &clverifier))
2983 /* case 1: probable callback update */
2984 copy_clid(new, conf);
2985 else /* case 4 (new client) or cases 2, 3 (client reboot): */
2987 new->cl_minorversion = 0;
2988 gen_callback(new, setclid, rqstp);
2989 add_to_unconfirmed(new);
2990 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
2991 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
2992 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
2996 spin_unlock(&nn->client_lock);
2997 nfs4_unlock_state();
3001 expire_client(unconf);
3007 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3008 struct nfsd4_compound_state *cstate,
3009 struct nfsd4_setclientid_confirm *setclientid_confirm)
3011 struct nfs4_client *conf, *unconf;
3012 struct nfs4_client *old = NULL;
3013 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3014 clientid_t * clid = &setclientid_confirm->sc_clientid;
3016 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3018 if (STALE_CLIENTID(clid, nn))
3019 return nfserr_stale_clientid;
3022 spin_lock(&nn->client_lock);
3023 conf = find_confirmed_client(clid, false, nn);
3024 unconf = find_unconfirmed_client(clid, false, nn);
3026 * We try hard to give out unique clientid's, so if we get an
3027 * attempt to confirm the same clientid with a different cred,
3028 * there's a bug somewhere. Let's charitably assume it's our
3031 status = nfserr_serverfault;
3032 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3034 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3036 /* cases below refer to rfc 3530 section 14.2.34: */
3037 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3038 if (conf && !unconf) /* case 2: probable retransmit */
3040 else /* case 4: client hasn't noticed we rebooted yet? */
3041 status = nfserr_stale_clientid;
3045 if (conf) { /* case 1: callback update */
3047 unhash_client_locked(old);
3048 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3049 } else { /* case 3: normal case; new or rebooted client */
3050 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3052 status = mark_client_expired_locked(old);
3058 move_to_confirmed(unconf);
3061 get_client_locked(conf);
3062 spin_unlock(&nn->client_lock);
3063 nfsd4_probe_callback(conf);
3064 spin_lock(&nn->client_lock);
3065 put_client_renew_locked(conf);
3067 spin_unlock(&nn->client_lock);
3070 nfs4_unlock_state();
3074 static struct nfs4_file *nfsd4_alloc_file(void)
3076 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3079 /* OPEN Share state helper functions */
3080 static void nfsd4_init_file(struct nfs4_file *fp, struct knfsd_fh *fh)
3082 unsigned int hashval = file_hashval(fh);
3084 lockdep_assert_held(&state_lock);
3086 atomic_set(&fp->fi_ref, 1);
3087 spin_lock_init(&fp->fi_lock);
3088 INIT_LIST_HEAD(&fp->fi_stateids);
3089 INIT_LIST_HEAD(&fp->fi_delegations);
3090 fh_copy_shallow(&fp->fi_fhandle, fh);
3091 fp->fi_had_conflict = false;
3092 fp->fi_lease = NULL;
3093 fp->fi_share_deny = 0;
3094 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3095 memset(fp->fi_access, 0, sizeof(fp->fi_access));
3096 hlist_add_head(&fp->fi_hash, &file_hashtbl[hashval]);
3100 nfsd4_free_slabs(void)
3102 kmem_cache_destroy(openowner_slab);
3103 kmem_cache_destroy(lockowner_slab);
3104 kmem_cache_destroy(file_slab);
3105 kmem_cache_destroy(stateid_slab);
3106 kmem_cache_destroy(deleg_slab);
3110 nfsd4_init_slabs(void)
3112 openowner_slab = kmem_cache_create("nfsd4_openowners",
3113 sizeof(struct nfs4_openowner), 0, 0, NULL);
3114 if (openowner_slab == NULL)
3116 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3117 sizeof(struct nfs4_lockowner), 0, 0, NULL);
3118 if (lockowner_slab == NULL)
3119 goto out_free_openowner_slab;
3120 file_slab = kmem_cache_create("nfsd4_files",
3121 sizeof(struct nfs4_file), 0, 0, NULL);
3122 if (file_slab == NULL)
3123 goto out_free_lockowner_slab;
3124 stateid_slab = kmem_cache_create("nfsd4_stateids",
3125 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3126 if (stateid_slab == NULL)
3127 goto out_free_file_slab;
3128 deleg_slab = kmem_cache_create("nfsd4_delegations",
3129 sizeof(struct nfs4_delegation), 0, 0, NULL);
3130 if (deleg_slab == NULL)
3131 goto out_free_stateid_slab;
3134 out_free_stateid_slab:
3135 kmem_cache_destroy(stateid_slab);
3137 kmem_cache_destroy(file_slab);
3138 out_free_lockowner_slab:
3139 kmem_cache_destroy(lockowner_slab);
3140 out_free_openowner_slab:
3141 kmem_cache_destroy(openowner_slab);
3143 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3147 static void init_nfs4_replay(struct nfs4_replay *rp)
3149 rp->rp_status = nfserr_serverfault;
3151 rp->rp_buf = rp->rp_ibuf;
3152 mutex_init(&rp->rp_mutex);
3155 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3156 struct nfs4_stateowner *so)
3158 if (!nfsd4_has_session(cstate)) {
3159 mutex_lock(&so->so_replay.rp_mutex);
3160 cstate->replay_owner = so;
3161 atomic_inc(&so->so_count);
3165 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3167 struct nfs4_stateowner *so = cstate->replay_owner;
3170 cstate->replay_owner = NULL;
3171 mutex_unlock(&so->so_replay.rp_mutex);
3172 nfs4_put_stateowner(so);
3176 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3178 struct nfs4_stateowner *sop;
3180 sop = kmem_cache_alloc(slab, GFP_KERNEL);
3184 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3185 if (!sop->so_owner.data) {
3186 kmem_cache_free(slab, sop);
3189 sop->so_owner.len = owner->len;
3191 INIT_LIST_HEAD(&sop->so_stateids);
3192 sop->so_client = clp;
3193 init_nfs4_replay(&sop->so_replay);
3194 atomic_set(&sop->so_count, 1);
3198 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3200 lockdep_assert_held(&clp->cl_lock);
3202 list_add(&oo->oo_owner.so_strhash,
3203 &clp->cl_ownerstr_hashtbl[strhashval]);
3204 list_add(&oo->oo_perclient, &clp->cl_openowners);
3207 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3209 unhash_openowner_locked(openowner(so));
3212 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3214 struct nfs4_openowner *oo = openowner(so);
3216 kmem_cache_free(openowner_slab, oo);
3219 static const struct nfs4_stateowner_operations openowner_ops = {
3220 .so_unhash = nfs4_unhash_openowner,
3221 .so_free = nfs4_free_openowner,
3224 static struct nfs4_openowner *
3225 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3226 struct nfsd4_compound_state *cstate)
3228 struct nfs4_client *clp = cstate->clp;
3229 struct nfs4_openowner *oo, *ret;
3231 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3234 oo->oo_owner.so_ops = &openowner_ops;
3235 oo->oo_owner.so_is_open_owner = 1;
3236 oo->oo_owner.so_seqid = open->op_seqid;
3238 if (nfsd4_has_session(cstate))
3239 oo->oo_flags |= NFS4_OO_CONFIRMED;
3241 oo->oo_last_closed_stid = NULL;
3242 INIT_LIST_HEAD(&oo->oo_close_lru);
3243 spin_lock(&clp->cl_lock);
3244 ret = find_openstateowner_str_locked(strhashval, open, clp);
3246 hash_openowner(oo, clp, strhashval);
3249 nfs4_free_openowner(&oo->oo_owner);
3250 spin_unlock(&clp->cl_lock);
3254 static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
3255 struct nfs4_openowner *oo = open->op_openowner;
3257 atomic_inc(&stp->st_stid.sc_count);
3258 stp->st_stid.sc_type = NFS4_OPEN_STID;
3259 INIT_LIST_HEAD(&stp->st_locks);
3260 stp->st_stateowner = &oo->oo_owner;
3261 atomic_inc(&stp->st_stateowner->so_count);
3263 stp->st_stid.sc_file = fp;
3264 stp->st_access_bmap = 0;
3265 stp->st_deny_bmap = 0;
3266 stp->st_openstp = NULL;
3267 spin_lock(&oo->oo_owner.so_client->cl_lock);
3268 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3269 spin_lock(&fp->fi_lock);
3270 list_add(&stp->st_perfile, &fp->fi_stateids);
3271 spin_unlock(&fp->fi_lock);
3272 spin_unlock(&oo->oo_owner.so_client->cl_lock);
3276 * In the 4.0 case we need to keep the owners around a little while to handle
3277 * CLOSE replay. We still do need to release any file access that is held by
3278 * them before returning however.
3281 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3283 struct nfs4_ol_stateid *last;
3284 struct nfs4_openowner *oo = openowner(s->st_stateowner);
3285 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3288 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3291 * We know that we hold one reference via nfsd4_close, and another
3292 * "persistent" reference for the client. If the refcount is higher
3293 * than 2, then there are still calls in progress that are using this
3294 * stateid. We can't put the sc_file reference until they are finished.
3295 * Wait for the refcount to drop to 2. Since it has been unhashed,
3296 * there should be no danger of the refcount going back up again at
3299 wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
3301 release_all_access(s);
3302 if (s->st_stid.sc_file) {
3303 put_nfs4_file(s->st_stid.sc_file);
3304 s->st_stid.sc_file = NULL;
3307 spin_lock(&nn->client_lock);
3308 last = oo->oo_last_closed_stid;
3309 oo->oo_last_closed_stid = s;
3310 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3311 oo->oo_time = get_seconds();
3312 spin_unlock(&nn->client_lock);
3314 nfs4_put_stid(&last->st_stid);
3317 /* search file_hashtbl[] for file */
3318 static struct nfs4_file *
3319 find_file_locked(struct knfsd_fh *fh)
3321 unsigned int hashval = file_hashval(fh);
3322 struct nfs4_file *fp;
3324 lockdep_assert_held(&state_lock);
3326 hlist_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
3327 if (nfsd_fh_match(&fp->fi_fhandle, fh)) {
3335 static struct nfs4_file *
3336 find_file(struct knfsd_fh *fh)
3338 struct nfs4_file *fp;
3340 spin_lock(&state_lock);
3341 fp = find_file_locked(fh);
3342 spin_unlock(&state_lock);
3346 static struct nfs4_file *
3347 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3349 struct nfs4_file *fp;
3351 spin_lock(&state_lock);
3352 fp = find_file_locked(fh);
3354 nfsd4_init_file(new, fh);
3357 spin_unlock(&state_lock);
3363 * Called to check deny when READ with all zero stateid or
3364 * WRITE with all zero or all one stateid
3367 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3369 struct nfs4_file *fp;
3370 __be32 ret = nfs_ok;
3372 fp = find_file(¤t_fh->fh_handle);
3375 /* Check for conflicting share reservations */
3376 spin_lock(&fp->fi_lock);
3377 if (fp->fi_share_deny & deny_type)
3378 ret = nfserr_locked;
3379 spin_unlock(&fp->fi_lock);
3384 void nfsd4_prepare_cb_recall(struct nfs4_delegation *dp)
3386 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3389 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3392 * We can't do this in nfsd_break_deleg_cb because it is
3393 * already holding inode->i_lock.
3395 * If the dl_time != 0, then we know that it has already been
3396 * queued for a lease break. Don't queue it again.
3398 spin_lock(&state_lock);
3399 if (dp->dl_time == 0) {
3400 dp->dl_time = get_seconds();
3401 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3403 spin_unlock(&state_lock);
3406 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3409 * We're assuming the state code never drops its reference
3410 * without first removing the lease. Since we're in this lease
3411 * callback (and since the lease code is serialized by the kernel
3412 * lock) we know the server hasn't removed the lease yet, we know
3413 * it's safe to take a reference.
3415 atomic_inc(&dp->dl_stid.sc_count);
3416 nfsd4_cb_recall(dp);
3419 /* Called from break_lease() with i_lock held. */
3420 static void nfsd_break_deleg_cb(struct file_lock *fl)
3422 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3423 struct nfs4_delegation *dp;
3426 WARN(1, "(%p)->fl_owner NULL\n", fl);
3429 if (fp->fi_had_conflict) {
3430 WARN(1, "duplicate break on %p\n", fp);
3434 * We don't want the locks code to timeout the lease for us;
3435 * we'll remove it ourself if a delegation isn't returned
3438 fl->fl_break_time = 0;
3440 spin_lock(&fp->fi_lock);
3441 fp->fi_had_conflict = true;
3443 * If there are no delegations on the list, then we can't count on this
3444 * lease ever being cleaned up. Set the fl_break_time to jiffies so that
3445 * time_out_leases will do it ASAP. The fact that fi_had_conflict is now
3446 * true should keep any new delegations from being hashed.
3448 if (list_empty(&fp->fi_delegations))
3449 fl->fl_break_time = jiffies;
3451 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3452 nfsd_break_one_deleg(dp);
3453 spin_unlock(&fp->fi_lock);
3457 int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
3460 return lease_modify(onlist, arg);
3465 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3466 .lm_break = nfsd_break_deleg_cb,
3467 .lm_change = nfsd_change_deleg_cb,
3470 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3472 if (nfsd4_has_session(cstate))
3474 if (seqid == so->so_seqid - 1)
3475 return nfserr_replay_me;
3476 if (seqid == so->so_seqid)
3478 return nfserr_bad_seqid;
3481 static __be32 lookup_clientid(clientid_t *clid,
3482 struct nfsd4_compound_state *cstate,
3483 struct nfsd_net *nn)
3485 struct nfs4_client *found;
3488 found = cstate->clp;
3489 if (!same_clid(&found->cl_clientid, clid))
3490 return nfserr_stale_clientid;
3494 if (STALE_CLIENTID(clid, nn))
3495 return nfserr_stale_clientid;
3498 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3499 * cached already then we know this is for is for v4.0 and "sessions"
3502 WARN_ON_ONCE(cstate->session);
3503 spin_lock(&nn->client_lock);
3504 found = find_confirmed_client(clid, false, nn);
3506 spin_unlock(&nn->client_lock);
3507 return nfserr_expired;
3509 atomic_inc(&found->cl_refcount);
3510 spin_unlock(&nn->client_lock);
3512 /* Cache the nfs4_client in cstate! */
3513 cstate->clp = found;
3518 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
3519 struct nfsd4_open *open, struct nfsd_net *nn)
3521 clientid_t *clientid = &open->op_clientid;
3522 struct nfs4_client *clp = NULL;
3523 unsigned int strhashval;
3524 struct nfs4_openowner *oo = NULL;
3527 if (STALE_CLIENTID(&open->op_clientid, nn))
3528 return nfserr_stale_clientid;
3530 * In case we need it later, after we've already created the
3531 * file and don't want to risk a further failure:
3533 open->op_file = nfsd4_alloc_file();
3534 if (open->op_file == NULL)
3535 return nfserr_jukebox;
3537 status = lookup_clientid(clientid, cstate, nn);
3542 strhashval = ownerstr_hashval(&open->op_owner);
3543 oo = find_openstateowner_str(strhashval, open, clp);
3544 open->op_openowner = oo;
3548 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
3549 /* Replace unconfirmed owners without checking for replay. */
3550 release_openowner(oo);
3551 open->op_openowner = NULL;
3554 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
3559 oo = alloc_init_open_stateowner(strhashval, open, cstate);
3561 return nfserr_jukebox;
3562 open->op_openowner = oo;
3564 open->op_stp = nfs4_alloc_open_stateid(clp);
3566 return nfserr_jukebox;
3570 static inline __be32
3571 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
3573 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
3574 return nfserr_openmode;
3579 static int share_access_to_flags(u32 share_access)
3581 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
3584 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
3586 struct nfs4_stid *ret;
3588 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
3591 return delegstateid(ret);
3594 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
3596 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
3597 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
3601 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
3602 struct nfs4_delegation **dp)
3605 __be32 status = nfserr_bad_stateid;
3606 struct nfs4_delegation *deleg;
3608 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
3611 flags = share_access_to_flags(open->op_share_access);
3612 status = nfs4_check_delegmode(deleg, flags);
3614 nfs4_put_stid(&deleg->dl_stid);
3619 if (!nfsd4_is_deleg_cur(open))
3623 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3627 static struct nfs4_ol_stateid *
3628 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3630 struct nfs4_ol_stateid *local, *ret = NULL;
3631 struct nfs4_openowner *oo = open->op_openowner;
3633 spin_lock(&fp->fi_lock);
3634 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3635 /* ignore lock owners */
3636 if (local->st_stateowner->so_is_open_owner == 0)
3638 if (local->st_stateowner == &oo->oo_owner) {
3640 atomic_inc(&ret->st_stid.sc_count);
3644 spin_unlock(&fp->fi_lock);
3648 static inline int nfs4_access_to_access(u32 nfs4_access)
3652 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
3653 flags |= NFSD_MAY_READ;
3654 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
3655 flags |= NFSD_MAY_WRITE;
3659 static inline __be32
3660 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
3661 struct nfsd4_open *open)
3663 struct iattr iattr = {
3664 .ia_valid = ATTR_SIZE,
3667 if (!open->op_truncate)
3669 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
3670 return nfserr_inval;
3671 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
3674 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
3675 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
3676 struct nfsd4_open *open)
3678 struct file *filp = NULL;
3680 int oflag = nfs4_access_to_omode(open->op_share_access);
3681 int access = nfs4_access_to_access(open->op_share_access);
3682 unsigned char old_access_bmap, old_deny_bmap;
3684 spin_lock(&fp->fi_lock);
3687 * Are we trying to set a deny mode that would conflict with
3690 status = nfs4_file_check_deny(fp, open->op_share_deny);
3691 if (status != nfs_ok) {
3692 spin_unlock(&fp->fi_lock);
3696 /* set access to the file */
3697 status = nfs4_file_get_access(fp, open->op_share_access);
3698 if (status != nfs_ok) {
3699 spin_unlock(&fp->fi_lock);
3703 /* Set access bits in stateid */
3704 old_access_bmap = stp->st_access_bmap;
3705 set_access(open->op_share_access, stp);
3707 /* Set new deny mask */
3708 old_deny_bmap = stp->st_deny_bmap;
3709 set_deny(open->op_share_deny, stp);
3710 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
3712 if (!fp->fi_fds[oflag]) {
3713 spin_unlock(&fp->fi_lock);
3714 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
3716 goto out_put_access;
3717 spin_lock(&fp->fi_lock);
3718 if (!fp->fi_fds[oflag]) {
3719 fp->fi_fds[oflag] = filp;
3723 spin_unlock(&fp->fi_lock);
3727 status = nfsd4_truncate(rqstp, cur_fh, open);
3729 goto out_put_access;
3733 stp->st_access_bmap = old_access_bmap;
3734 nfs4_file_put_access(fp, open->op_share_access);
3735 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
3740 nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
3743 unsigned char old_deny_bmap;
3745 if (!test_access(open->op_share_access, stp))
3746 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
3748 /* test and set deny mode */
3749 spin_lock(&fp->fi_lock);
3750 status = nfs4_file_check_deny(fp, open->op_share_deny);
3751 if (status == nfs_ok) {
3752 old_deny_bmap = stp->st_deny_bmap;
3753 set_deny(open->op_share_deny, stp);
3754 fp->fi_share_deny |=
3755 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
3757 spin_unlock(&fp->fi_lock);
3759 if (status != nfs_ok)
3762 status = nfsd4_truncate(rqstp, cur_fh, open);
3763 if (status != nfs_ok)
3764 reset_union_bmap_deny(old_deny_bmap, stp);
3769 nfs4_set_claim_prev(struct nfsd4_open *open, bool has_session)
3771 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
3774 /* Should we give out recallable state?: */
3775 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
3777 if (clp->cl_cb_state == NFSD4_CB_UP)
3780 * In the sessions case, since we don't have to establish a
3781 * separate connection for callbacks, we assume it's OK
3782 * until we hear otherwise:
3784 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
3787 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
3789 struct file_lock *fl;
3791 fl = locks_alloc_lock();
3794 locks_init_lock(fl);
3795 fl->fl_lmops = &nfsd_lease_mng_ops;
3796 fl->fl_flags = FL_DELEG;
3797 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
3798 fl->fl_end = OFFSET_MAX;
3799 fl->fl_owner = (fl_owner_t)fp;
3800 fl->fl_pid = current->tgid;
3804 static int nfs4_setlease(struct nfs4_delegation *dp)
3806 struct nfs4_file *fp = dp->dl_stid.sc_file;
3807 struct file_lock *fl;
3811 fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
3814 filp = find_readable_file(fp);
3816 /* We should always have a readable file here */
3821 status = vfs_setlease(filp, fl->fl_type, &fl);
3823 locks_free_lock(fl);
3826 spin_lock(&state_lock);
3827 spin_lock(&fp->fi_lock);
3828 /* Did the lease get broken before we took the lock? */
3830 if (fp->fi_had_conflict)
3835 atomic_inc(&fp->fi_delegees);
3836 hash_delegation_locked(dp, fp);
3840 fp->fi_deleg_file = filp;
3841 atomic_set(&fp->fi_delegees, 1);
3842 hash_delegation_locked(dp, fp);
3843 spin_unlock(&fp->fi_lock);
3844 spin_unlock(&state_lock);
3847 spin_unlock(&fp->fi_lock);
3848 spin_unlock(&state_lock);
3854 static struct nfs4_delegation *
3855 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
3856 struct nfs4_file *fp)
3859 struct nfs4_delegation *dp;
3861 if (fp->fi_had_conflict)
3862 return ERR_PTR(-EAGAIN);
3864 dp = alloc_init_deleg(clp, fh);
3866 return ERR_PTR(-ENOMEM);
3869 spin_lock(&state_lock);
3870 spin_lock(&fp->fi_lock);
3871 dp->dl_stid.sc_file = fp;
3872 if (!fp->fi_lease) {
3873 spin_unlock(&fp->fi_lock);
3874 spin_unlock(&state_lock);
3875 status = nfs4_setlease(dp);
3878 atomic_inc(&fp->fi_delegees);
3879 if (fp->fi_had_conflict) {
3883 hash_delegation_locked(dp, fp);
3886 spin_unlock(&fp->fi_lock);
3887 spin_unlock(&state_lock);
3890 nfs4_put_stid(&dp->dl_stid);
3891 return ERR_PTR(status);
3896 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
3898 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3899 if (status == -EAGAIN)
3900 open->op_why_no_deleg = WND4_CONTENTION;
3902 open->op_why_no_deleg = WND4_RESOURCE;
3903 switch (open->op_deleg_want) {
3904 case NFS4_SHARE_WANT_READ_DELEG:
3905 case NFS4_SHARE_WANT_WRITE_DELEG:
3906 case NFS4_SHARE_WANT_ANY_DELEG:
3908 case NFS4_SHARE_WANT_CANCEL:
3909 open->op_why_no_deleg = WND4_CANCELLED;
3911 case NFS4_SHARE_WANT_NO_DELEG:
3918 * Attempt to hand out a delegation.
3920 * Note we don't support write delegations, and won't until the vfs has
3921 * proper support for them.
3924 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
3925 struct nfs4_ol_stateid *stp)
3927 struct nfs4_delegation *dp;
3928 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
3929 struct nfs4_client *clp = stp->st_stid.sc_client;
3933 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
3934 open->op_recall = 0;
3935 switch (open->op_claim_type) {
3936 case NFS4_OPEN_CLAIM_PREVIOUS:
3938 open->op_recall = 1;
3939 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
3942 case NFS4_OPEN_CLAIM_NULL:
3943 case NFS4_OPEN_CLAIM_FH:
3945 * Let's not give out any delegations till everyone's
3946 * had the chance to reclaim theirs....
3948 if (locks_in_grace(clp->net))
3950 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
3953 * Also, if the file was opened for write or
3954 * create, there's a good chance the client's
3955 * about to write to it, resulting in an
3956 * immediate recall (since we don't support
3957 * write delegations):
3959 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
3961 if (open->op_create == NFS4_OPEN_CREATE)
3967 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file);
3971 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
3973 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
3974 STATEID_VAL(&dp->dl_stid.sc_stateid));
3975 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
3976 nfs4_put_stid(&dp->dl_stid);
3979 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
3980 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
3981 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
3982 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
3983 open->op_recall = 1;
3986 /* 4.1 client asking for a delegation? */
3987 if (open->op_deleg_want)
3988 nfsd4_open_deleg_none_ext(open, status);
3992 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
3993 struct nfs4_delegation *dp)
3995 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
3996 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
3997 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
3998 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
3999 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4000 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4001 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4002 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4004 /* Otherwise the client must be confused wanting a delegation
4005 * it already has, therefore we don't return
4006 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4011 * called with nfs4_lock_state() held.
4014 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4016 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4017 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4018 struct nfs4_file *fp = NULL;
4019 struct nfs4_ol_stateid *stp = NULL;
4020 struct nfs4_delegation *dp = NULL;
4024 * Lookup file; if found, lookup stateid and check open request,
4025 * and check for delegations in the process of being recalled.
4026 * If not found, create the nfs4_file struct
4028 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
4029 if (fp != open->op_file) {
4030 status = nfs4_check_deleg(cl, open, &dp);
4033 stp = nfsd4_find_existing_open(fp, open);
4035 open->op_file = NULL;
4036 status = nfserr_bad_stateid;
4037 if (nfsd4_is_deleg_cur(open))
4039 status = nfserr_jukebox;
4043 * OPEN the file, or upgrade an existing OPEN.
4044 * If truncate fails, the OPEN fails.
4047 /* Stateid was found, this is an OPEN upgrade */
4048 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4053 open->op_stp = NULL;
4054 init_open_stateid(stp, fp, open);
4055 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4057 release_open_stateid(stp);
4061 update_stateid(&stp->st_stid.sc_stateid);
4062 memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4064 if (nfsd4_has_session(&resp->cstate)) {
4065 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4066 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4067 open->op_why_no_deleg = WND4_NOT_WANTED;
4073 * Attempt to hand out a delegation. No error return, because the
4074 * OPEN succeeds even if we fail.
4076 nfs4_open_delegation(current_fh, open, stp);
4080 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4081 STATEID_VAL(&stp->st_stid.sc_stateid));
4083 /* 4.1 client trying to upgrade/downgrade delegation? */
4084 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4085 open->op_deleg_want)
4086 nfsd4_deleg_xgrade_none_ext(open, dp);
4090 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4091 nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
4093 * To finish the open response, we just need to set the rflags.
4095 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4096 if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
4097 !nfsd4_has_session(&resp->cstate))
4098 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4100 nfs4_put_stid(&dp->dl_stid);
4102 nfs4_put_stid(&stp->st_stid);
4107 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4108 struct nfsd4_open *open, __be32 status)
4110 if (open->op_openowner) {
4111 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4113 nfsd4_cstate_assign_replay(cstate, so);
4114 nfs4_put_stateowner(so);
4117 nfsd4_free_file(open->op_file);
4119 nfs4_put_stid(&open->op_stp->st_stid);
4123 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4126 struct nfs4_client *clp;
4128 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4131 dprintk("process_renew(%08x/%08x): starting\n",
4132 clid->cl_boot, clid->cl_id);
4133 status = lookup_clientid(clid, cstate, nn);
4137 status = nfserr_cb_path_down;
4138 if (!list_empty(&clp->cl_delegations)
4139 && clp->cl_cb_state != NFSD4_CB_UP)
4143 nfs4_unlock_state();
4148 nfsd4_end_grace(struct nfsd_net *nn)
4150 /* do nothing if grace period already ended */
4151 if (nn->grace_ended)
4154 dprintk("NFSD: end of grace period\n");
4155 nn->grace_ended = true;
4156 nfsd4_record_grace_done(nn, nn->boot_time);
4157 locks_end_grace(&nn->nfsd4_manager);
4159 * Now that every NFSv4 client has had the chance to recover and
4160 * to see the (possibly new, possibly shorter) lease time, we
4161 * can safely set the next grace time to the current lease time:
4163 nn->nfsd4_grace = nn->nfsd4_lease;
4167 nfs4_laundromat(struct nfsd_net *nn)
4169 struct nfs4_client *clp;
4170 struct nfs4_openowner *oo;
4171 struct nfs4_delegation *dp;
4172 struct nfs4_ol_stateid *stp;
4173 struct list_head *pos, *next, reaplist;
4174 time_t cutoff = get_seconds() - nn->nfsd4_lease;
4175 time_t t, new_timeo = nn->nfsd4_lease;
4179 dprintk("NFSD: laundromat service - starting\n");
4180 nfsd4_end_grace(nn);
4181 INIT_LIST_HEAD(&reaplist);
4182 spin_lock(&nn->client_lock);
4183 list_for_each_safe(pos, next, &nn->client_lru) {
4184 clp = list_entry(pos, struct nfs4_client, cl_lru);
4185 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4186 t = clp->cl_time - cutoff;
4187 new_timeo = min(new_timeo, t);
4190 if (mark_client_expired_locked(clp)) {
4191 dprintk("NFSD: client in use (clientid %08x)\n",
4192 clp->cl_clientid.cl_id);
4195 list_add(&clp->cl_lru, &reaplist);
4197 spin_unlock(&nn->client_lock);
4198 list_for_each_safe(pos, next, &reaplist) {
4199 clp = list_entry(pos, struct nfs4_client, cl_lru);
4200 dprintk("NFSD: purging unused client (clientid %08x)\n",
4201 clp->cl_clientid.cl_id);
4202 list_del_init(&clp->cl_lru);
4205 spin_lock(&state_lock);
4206 list_for_each_safe(pos, next, &nn->del_recall_lru) {
4207 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4208 if (net_generic(dp->dl_stid.sc_client->net, nfsd_net_id) != nn)
4210 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4211 t = dp->dl_time - cutoff;
4212 new_timeo = min(new_timeo, t);
4215 unhash_delegation_locked(dp);
4216 list_add(&dp->dl_recall_lru, &reaplist);
4218 spin_unlock(&state_lock);
4219 while (!list_empty(&reaplist)) {
4220 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4222 list_del_init(&dp->dl_recall_lru);
4223 revoke_delegation(dp);
4226 spin_lock(&nn->client_lock);
4227 while (!list_empty(&nn->close_lru)) {
4228 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4230 if (time_after((unsigned long)oo->oo_time,
4231 (unsigned long)cutoff)) {
4232 t = oo->oo_time - cutoff;
4233 new_timeo = min(new_timeo, t);
4236 list_del_init(&oo->oo_close_lru);
4237 stp = oo->oo_last_closed_stid;
4238 oo->oo_last_closed_stid = NULL;
4239 spin_unlock(&nn->client_lock);
4240 nfs4_put_stid(&stp->st_stid);
4241 spin_lock(&nn->client_lock);
4243 spin_unlock(&nn->client_lock);
4245 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4246 nfs4_unlock_state();
4250 static struct workqueue_struct *laundry_wq;
4251 static void laundromat_main(struct work_struct *);
4254 laundromat_main(struct work_struct *laundry)
4257 struct delayed_work *dwork = container_of(laundry, struct delayed_work,
4259 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4262 t = nfs4_laundromat(nn);
4263 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4264 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4267 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
4269 if (!nfsd_fh_match(&fhp->fh_handle, &stp->st_stid.sc_file->fi_fhandle))
4270 return nfserr_bad_stateid;
4275 access_permit_read(struct nfs4_ol_stateid *stp)
4277 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4278 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4279 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4283 access_permit_write(struct nfs4_ol_stateid *stp)
4285 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4286 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4290 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4292 __be32 status = nfserr_openmode;
4294 /* For lock stateid's, we test the parent open, not the lock: */
4295 if (stp->st_openstp)
4296 stp = stp->st_openstp;
4297 if ((flags & WR_STATE) && !access_permit_write(stp))
4299 if ((flags & RD_STATE) && !access_permit_read(stp))
4306 static inline __be32
4307 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4309 if (ONE_STATEID(stateid) && (flags & RD_STATE))
4311 else if (locks_in_grace(net)) {
4312 /* Answer in remaining cases depends on existence of
4313 * conflicting state; so we must wait out the grace period. */
4314 return nfserr_grace;
4315 } else if (flags & WR_STATE)
4316 return nfs4_share_conflict(current_fh,
4317 NFS4_SHARE_DENY_WRITE);
4318 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4319 return nfs4_share_conflict(current_fh,
4320 NFS4_SHARE_DENY_READ);
4324 * Allow READ/WRITE during grace period on recovered state only for files
4325 * that are not able to provide mandatory locking.
4328 grace_disallows_io(struct net *net, struct inode *inode)
4330 return locks_in_grace(net) && mandatory_lock(inode);
4333 /* Returns true iff a is later than b: */
4334 static bool stateid_generation_after(stateid_t *a, stateid_t *b)
4336 return (s32)(a->si_generation - b->si_generation) > 0;
4339 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4342 * When sessions are used the stateid generation number is ignored
4345 if (has_session && in->si_generation == 0)
4348 if (in->si_generation == ref->si_generation)
4351 /* If the client sends us a stateid from the future, it's buggy: */
4352 if (stateid_generation_after(in, ref))
4353 return nfserr_bad_stateid;
4355 * However, we could see a stateid from the past, even from a
4356 * non-buggy client. For example, if the client sends a lock
4357 * while some IO is outstanding, the lock may bump si_generation
4358 * while the IO is still in flight. The client could avoid that
4359 * situation by waiting for responses on all the IO requests,
4360 * but better performance may result in retrying IO that
4361 * receives an old_stateid error if requests are rarely
4362 * reordered in flight:
4364 return nfserr_old_stateid;
4367 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4369 struct nfs4_stid *s;
4370 struct nfs4_ol_stateid *ols;
4371 __be32 status = nfserr_bad_stateid;
4373 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4375 /* Client debugging aid. */
4376 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4377 char addr_str[INET6_ADDRSTRLEN];
4378 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4380 pr_warn_ratelimited("NFSD: client %s testing state ID "
4381 "with incorrect client ID\n", addr_str);
4384 spin_lock(&cl->cl_lock);
4385 s = find_stateid_locked(cl, stateid);
4388 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
4391 switch (s->sc_type) {
4392 case NFS4_DELEG_STID:
4395 case NFS4_REVOKED_DELEG_STID:
4396 status = nfserr_deleg_revoked;
4398 case NFS4_OPEN_STID:
4399 case NFS4_LOCK_STID:
4400 ols = openlockstateid(s);
4401 if (ols->st_stateowner->so_is_open_owner
4402 && !(openowner(ols->st_stateowner)->oo_flags
4403 & NFS4_OO_CONFIRMED))
4404 status = nfserr_bad_stateid;
4409 printk("unknown stateid type %x\n", s->sc_type);
4411 case NFS4_CLOSED_STID:
4412 case NFS4_CLOSED_DELEG_STID:
4413 status = nfserr_bad_stateid;
4416 spin_unlock(&cl->cl_lock);
4421 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4422 stateid_t *stateid, unsigned char typemask,
4423 struct nfs4_stid **s, struct nfsd_net *nn)
4427 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4428 return nfserr_bad_stateid;
4429 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
4430 if (status == nfserr_stale_clientid) {
4431 if (cstate->session)
4432 return nfserr_bad_stateid;
4433 return nfserr_stale_stateid;
4437 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
4439 return nfserr_bad_stateid;
4444 * Checks for stateid operations
4447 nfs4_preprocess_stateid_op(struct net *net, struct nfsd4_compound_state *cstate,
4448 stateid_t *stateid, int flags, struct file **filpp)
4450 struct nfs4_stid *s;
4451 struct nfs4_ol_stateid *stp = NULL;
4452 struct nfs4_delegation *dp = NULL;
4453 struct svc_fh *current_fh = &cstate->current_fh;
4454 struct inode *ino = current_fh->fh_dentry->d_inode;
4455 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4456 struct file *file = NULL;
4462 if (grace_disallows_io(net, ino))
4463 return nfserr_grace;
4465 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4466 return check_special_stateids(net, current_fh, stateid, flags);
4468 status = nfsd4_lookup_stateid(cstate, stateid,
4469 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
4473 status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
4476 switch (s->sc_type) {
4477 case NFS4_DELEG_STID:
4478 dp = delegstateid(s);
4479 status = nfs4_check_delegmode(dp, flags);
4483 file = dp->dl_stid.sc_file->fi_deleg_file;
4486 status = nfserr_serverfault;
4492 case NFS4_OPEN_STID:
4493 case NFS4_LOCK_STID:
4494 stp = openlockstateid(s);
4495 status = nfs4_check_fh(current_fh, stp);
4498 if (stp->st_stateowner->so_is_open_owner
4499 && !(openowner(stp->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4501 status = nfs4_check_openmode(stp, flags);
4505 struct nfs4_file *fp = stp->st_stid.sc_file;
4507 if (flags & RD_STATE)
4508 file = find_readable_file(fp);
4510 file = find_writeable_file(fp);
4514 status = nfserr_bad_stateid;
4526 * Test if the stateid is valid
4529 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4530 struct nfsd4_test_stateid *test_stateid)
4532 struct nfsd4_test_stateid_id *stateid;
4533 struct nfs4_client *cl = cstate->session->se_client;
4535 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
4536 stateid->ts_id_status =
4537 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
4543 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4544 struct nfsd4_free_stateid *free_stateid)
4546 stateid_t *stateid = &free_stateid->fr_stateid;
4547 struct nfs4_stid *s;
4548 struct nfs4_delegation *dp;
4549 struct nfs4_ol_stateid *stp;
4550 struct nfs4_client *cl = cstate->session->se_client;
4551 __be32 ret = nfserr_bad_stateid;
4553 spin_lock(&cl->cl_lock);
4554 s = find_stateid_locked(cl, stateid);
4557 switch (s->sc_type) {
4558 case NFS4_DELEG_STID:
4559 ret = nfserr_locks_held;
4561 case NFS4_OPEN_STID:
4562 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
4565 ret = nfserr_locks_held;
4567 case NFS4_LOCK_STID:
4568 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
4571 stp = openlockstateid(s);
4572 ret = nfserr_locks_held;
4573 if (check_for_locks(stp->st_stid.sc_file,
4574 lockowner(stp->st_stateowner)))
4576 unhash_lock_stateid(stp);
4577 spin_unlock(&cl->cl_lock);
4581 case NFS4_REVOKED_DELEG_STID:
4582 dp = delegstateid(s);
4583 list_del_init(&dp->dl_recall_lru);
4584 spin_unlock(&cl->cl_lock);
4588 /* Default falls through and returns nfserr_bad_stateid */
4591 spin_unlock(&cl->cl_lock);
4599 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
4600 RD_STATE : WR_STATE;
4603 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
4605 struct svc_fh *current_fh = &cstate->current_fh;
4606 struct nfs4_stateowner *sop = stp->st_stateowner;
4609 status = nfsd4_check_seqid(cstate, sop, seqid);
4612 if (stp->st_stid.sc_type == NFS4_CLOSED_STID
4613 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4615 * "Closed" stateid's exist *only* to return
4616 * nfserr_replay_me from the previous step, and
4617 * revoked delegations are kept only for free_stateid.
4619 return nfserr_bad_stateid;
4620 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
4623 return nfs4_check_fh(current_fh, stp);
4627 * Checks for sequence id mutating operations.
4630 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4631 stateid_t *stateid, char typemask,
4632 struct nfs4_ol_stateid **stpp,
4633 struct nfsd_net *nn)
4636 struct nfs4_stid *s;
4637 struct nfs4_ol_stateid *stp = NULL;
4639 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
4640 seqid, STATEID_VAL(stateid));
4643 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
4646 stp = openlockstateid(s);
4647 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
4649 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
4653 nfs4_put_stid(&stp->st_stid);
4657 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
4658 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
4661 struct nfs4_openowner *oo;
4662 struct nfs4_ol_stateid *stp;
4664 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
4665 NFS4_OPEN_STID, &stp, nn);
4668 oo = openowner(stp->st_stateowner);
4669 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4670 nfs4_put_stid(&stp->st_stid);
4671 return nfserr_bad_stateid;
4678 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4679 struct nfsd4_open_confirm *oc)
4682 struct nfs4_openowner *oo;
4683 struct nfs4_ol_stateid *stp;
4684 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4686 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
4687 cstate->current_fh.fh_dentry);
4689 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
4695 status = nfs4_preprocess_seqid_op(cstate,
4696 oc->oc_seqid, &oc->oc_req_stateid,
4697 NFS4_OPEN_STID, &stp, nn);
4700 oo = openowner(stp->st_stateowner);
4701 status = nfserr_bad_stateid;
4702 if (oo->oo_flags & NFS4_OO_CONFIRMED)
4704 oo->oo_flags |= NFS4_OO_CONFIRMED;
4705 update_stateid(&stp->st_stid.sc_stateid);
4706 memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4707 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
4708 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
4710 nfsd4_client_record_create(oo->oo_owner.so_client);
4713 nfs4_put_stid(&stp->st_stid);
4715 nfsd4_bump_seqid(cstate, status);
4719 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
4721 if (!test_access(access, stp))
4723 nfs4_file_put_access(stp->st_stid.sc_file, access);
4724 clear_access(access, stp);
4727 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
4729 switch (to_access) {
4730 case NFS4_SHARE_ACCESS_READ:
4731 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
4732 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4734 case NFS4_SHARE_ACCESS_WRITE:
4735 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
4736 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
4738 case NFS4_SHARE_ACCESS_BOTH:
4746 nfsd4_open_downgrade(struct svc_rqst *rqstp,
4747 struct nfsd4_compound_state *cstate,
4748 struct nfsd4_open_downgrade *od)
4751 struct nfs4_ol_stateid *stp;
4752 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4754 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
4755 cstate->current_fh.fh_dentry);
4757 /* We don't yet support WANT bits: */
4758 if (od->od_deleg_want)
4759 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
4762 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
4763 &od->od_stateid, &stp, nn);
4766 status = nfserr_inval;
4767 if (!test_access(od->od_share_access, stp)) {
4768 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
4769 stp->st_access_bmap, od->od_share_access);
4772 if (!test_deny(od->od_share_deny, stp)) {
4773 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
4774 stp->st_deny_bmap, od->od_share_deny);
4777 nfs4_stateid_downgrade(stp, od->od_share_access);
4779 reset_union_bmap_deny(od->od_share_deny, stp);
4781 update_stateid(&stp->st_stid.sc_stateid);
4782 memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4785 nfs4_put_stid(&stp->st_stid);
4787 nfsd4_bump_seqid(cstate, status);
4788 nfs4_unlock_state();
4792 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
4794 struct nfs4_client *clp = s->st_stid.sc_client;
4795 LIST_HEAD(reaplist);
4797 s->st_stid.sc_type = NFS4_CLOSED_STID;
4798 spin_lock(&clp->cl_lock);
4799 unhash_open_stateid(s, &reaplist);
4801 if (clp->cl_minorversion) {
4802 put_ol_stateid_locked(s, &reaplist);
4803 spin_unlock(&clp->cl_lock);
4804 free_ol_stateid_reaplist(&reaplist);
4806 spin_unlock(&clp->cl_lock);
4807 free_ol_stateid_reaplist(&reaplist);
4808 move_to_close_lru(s, clp->net);
4813 * nfs4_unlock_state() called after encode
4816 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4817 struct nfsd4_close *close)
4820 struct nfs4_ol_stateid *stp;
4821 struct net *net = SVC_NET(rqstp);
4822 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4824 dprintk("NFSD: nfsd4_close on file %pd\n",
4825 cstate->current_fh.fh_dentry);
4827 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
4829 NFS4_OPEN_STID|NFS4_CLOSED_STID,
4831 nfsd4_bump_seqid(cstate, status);
4834 update_stateid(&stp->st_stid.sc_stateid);
4835 memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
4837 nfsd4_close_open_stateid(stp);
4839 /* put reference from nfs4_preprocess_seqid_op */
4840 nfs4_put_stid(&stp->st_stid);
4846 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4847 struct nfsd4_delegreturn *dr)
4849 struct nfs4_delegation *dp;
4850 stateid_t *stateid = &dr->dr_stateid;
4851 struct nfs4_stid *s;
4853 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4855 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
4859 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
4862 dp = delegstateid(s);
4863 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
4867 destroy_delegation(dp);
4869 nfs4_put_stid(&dp->dl_stid);
4871 nfs4_unlock_state();
4877 #define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
4880 end_offset(u64 start, u64 len)
4885 return end >= start ? end: NFS4_MAX_UINT64;
4888 /* last octet in a range */
4890 last_byte_offset(u64 start, u64 len)
4896 return end > start ? end - 1: NFS4_MAX_UINT64;
4900 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
4901 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
4902 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
4903 * locking, this prevents us from being completely protocol-compliant. The
4904 * real solution to this problem is to start using unsigned file offsets in
4905 * the VFS, but this is a very deep change!
4908 nfs4_transform_lock_offset(struct file_lock *lock)
4910 if (lock->fl_start < 0)
4911 lock->fl_start = OFFSET_MAX;
4912 if (lock->fl_end < 0)
4913 lock->fl_end = OFFSET_MAX;
4916 /* Hack!: For now, we're defining this just so we can use a pointer to it
4917 * as a unique cookie to identify our (NFSv4's) posix locks. */
4918 static const struct lock_manager_operations nfsd_posix_mng_ops = {
4922 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
4924 struct nfs4_lockowner *lo;
4926 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
4927 lo = (struct nfs4_lockowner *) fl->fl_owner;
4928 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
4929 lo->lo_owner.so_owner.len, GFP_KERNEL);
4930 if (!deny->ld_owner.data)
4931 /* We just don't care that much */
4933 deny->ld_owner.len = lo->lo_owner.so_owner.len;
4934 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
4937 deny->ld_owner.len = 0;
4938 deny->ld_owner.data = NULL;
4939 deny->ld_clientid.cl_boot = 0;
4940 deny->ld_clientid.cl_id = 0;
4942 deny->ld_start = fl->fl_start;
4943 deny->ld_length = NFS4_MAX_UINT64;
4944 if (fl->fl_end != NFS4_MAX_UINT64)
4945 deny->ld_length = fl->fl_end - fl->fl_start + 1;
4946 deny->ld_type = NFS4_READ_LT;
4947 if (fl->fl_type != F_RDLCK)
4948 deny->ld_type = NFS4_WRITE_LT;
4951 static struct nfs4_lockowner *
4952 find_lockowner_str_locked(clientid_t *clid, struct xdr_netobj *owner,
4953 struct nfs4_client *clp)
4955 unsigned int strhashval = ownerstr_hashval(owner);
4956 struct nfs4_stateowner *so;
4958 lockdep_assert_held(&clp->cl_lock);
4960 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
4962 if (so->so_is_open_owner)
4964 if (!same_owner_str(so, owner))
4966 atomic_inc(&so->so_count);
4967 return lockowner(so);
4972 static struct nfs4_lockowner *
4973 find_lockowner_str(clientid_t *clid, struct xdr_netobj *owner,
4974 struct nfs4_client *clp)
4976 struct nfs4_lockowner *lo;
4978 spin_lock(&clp->cl_lock);
4979 lo = find_lockowner_str_locked(clid, owner, clp);
4980 spin_unlock(&clp->cl_lock);
4984 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
4986 unhash_lockowner_locked(lockowner(sop));
4989 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
4991 struct nfs4_lockowner *lo = lockowner(sop);
4993 kmem_cache_free(lockowner_slab, lo);
4996 static const struct nfs4_stateowner_operations lockowner_ops = {
4997 .so_unhash = nfs4_unhash_lockowner,
4998 .so_free = nfs4_free_lockowner,
5002 * Alloc a lock owner structure.
5003 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5006 * strhashval = ownerstr_hashval
5008 static struct nfs4_lockowner *
5009 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5010 struct nfs4_ol_stateid *open_stp,
5011 struct nfsd4_lock *lock)
5013 struct nfs4_lockowner *lo, *ret;
5015 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5018 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5019 lo->lo_owner.so_is_open_owner = 0;
5020 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5021 lo->lo_owner.so_ops = &lockowner_ops;
5022 spin_lock(&clp->cl_lock);
5023 ret = find_lockowner_str_locked(&clp->cl_clientid,
5024 &lock->lk_new_owner, clp);
5026 list_add(&lo->lo_owner.so_strhash,
5027 &clp->cl_ownerstr_hashtbl[strhashval]);
5030 nfs4_free_lockowner(&lo->lo_owner);
5031 spin_unlock(&clp->cl_lock);
5036 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5037 struct nfs4_file *fp, struct inode *inode,
5038 struct nfs4_ol_stateid *open_stp)
5040 struct nfs4_client *clp = lo->lo_owner.so_client;
5042 lockdep_assert_held(&clp->cl_lock);
5044 atomic_inc(&stp->st_stid.sc_count);
5045 stp->st_stid.sc_type = NFS4_LOCK_STID;
5046 stp->st_stateowner = &lo->lo_owner;
5047 atomic_inc(&lo->lo_owner.so_count);
5049 stp->st_stid.sc_file = fp;
5050 stp->st_stid.sc_free = nfs4_free_lock_stateid;
5051 stp->st_access_bmap = 0;
5052 stp->st_deny_bmap = open_stp->st_deny_bmap;
5053 stp->st_openstp = open_stp;
5054 list_add(&stp->st_locks, &open_stp->st_locks);
5055 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5056 spin_lock(&fp->fi_lock);
5057 list_add(&stp->st_perfile, &fp->fi_stateids);
5058 spin_unlock(&fp->fi_lock);
5061 static struct nfs4_ol_stateid *
5062 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5064 struct nfs4_ol_stateid *lst;
5065 struct nfs4_client *clp = lo->lo_owner.so_client;
5067 lockdep_assert_held(&clp->cl_lock);
5069 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5070 if (lst->st_stid.sc_file == fp) {
5071 atomic_inc(&lst->st_stid.sc_count);
5078 static struct nfs4_ol_stateid *
5079 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5080 struct inode *inode, struct nfs4_ol_stateid *ost,
5083 struct nfs4_stid *ns = NULL;
5084 struct nfs4_ol_stateid *lst;
5085 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5086 struct nfs4_client *clp = oo->oo_owner.so_client;
5088 spin_lock(&clp->cl_lock);
5089 lst = find_lock_stateid(lo, fi);
5091 spin_unlock(&clp->cl_lock);
5092 ns = nfs4_alloc_stid(clp, stateid_slab);
5096 spin_lock(&clp->cl_lock);
5097 lst = find_lock_stateid(lo, fi);
5099 lst = openlockstateid(ns);
5100 init_lock_stateid(lst, lo, fi, inode, ost);
5105 spin_unlock(&clp->cl_lock);
5112 check_lock_length(u64 offset, u64 length)
5114 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5115 LOFF_OVERFLOW(offset, length)));
5118 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5120 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5122 lockdep_assert_held(&fp->fi_lock);
5124 if (test_access(access, lock_stp))
5126 __nfs4_file_get_access(fp, access);
5127 set_access(access, lock_stp);
5131 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5132 struct nfs4_ol_stateid *ost,
5133 struct nfsd4_lock *lock,
5134 struct nfs4_ol_stateid **lst, bool *new)
5137 struct nfs4_file *fi = ost->st_stid.sc_file;
5138 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5139 struct nfs4_client *cl = oo->oo_owner.so_client;
5140 struct inode *inode = cstate->current_fh.fh_dentry->d_inode;
5141 struct nfs4_lockowner *lo;
5142 unsigned int strhashval;
5144 lo = find_lockowner_str(&cl->cl_clientid, &lock->v.new.owner, cl);
5146 strhashval = ownerstr_hashval(&lock->v.new.owner);
5147 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5149 return nfserr_jukebox;
5151 /* with an existing lockowner, seqids must be the same */
5152 status = nfserr_bad_seqid;
5153 if (!cstate->minorversion &&
5154 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5158 *lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5160 status = nfserr_jukebox;
5165 nfs4_put_stateowner(&lo->lo_owner);
5173 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5174 struct nfsd4_lock *lock)
5176 struct nfs4_openowner *open_sop = NULL;
5177 struct nfs4_lockowner *lock_sop = NULL;
5178 struct nfs4_ol_stateid *lock_stp = NULL;
5179 struct nfs4_ol_stateid *open_stp = NULL;
5180 struct nfs4_file *fp;
5181 struct file *filp = NULL;
5182 struct file_lock *file_lock = NULL;
5183 struct file_lock *conflock = NULL;
5188 struct net *net = SVC_NET(rqstp);
5189 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5191 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5192 (long long) lock->lk_offset,
5193 (long long) lock->lk_length);
5195 if (check_lock_length(lock->lk_offset, lock->lk_length))
5196 return nfserr_inval;
5198 if ((status = fh_verify(rqstp, &cstate->current_fh,
5199 S_IFREG, NFSD_MAY_LOCK))) {
5200 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5204 if (lock->lk_is_new) {
5205 if (nfsd4_has_session(cstate))
5206 /* See rfc 5661 18.10.3: given clientid is ignored: */
5207 memcpy(&lock->v.new.clientid,
5208 &cstate->session->se_client->cl_clientid,
5209 sizeof(clientid_t));
5211 status = nfserr_stale_clientid;
5212 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5215 /* validate and update open stateid and open seqid */
5216 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5217 lock->lk_new_open_seqid,
5218 &lock->lk_new_open_stateid,
5222 open_sop = openowner(open_stp->st_stateowner);
5223 status = nfserr_bad_stateid;
5224 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5225 &lock->v.new.clientid))
5227 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5230 status = nfs4_preprocess_seqid_op(cstate,
5231 lock->lk_old_lock_seqid,
5232 &lock->lk_old_lock_stateid,
5233 NFS4_LOCK_STID, &lock_stp, nn);
5237 lock_sop = lockowner(lock_stp->st_stateowner);
5239 lkflg = setlkflg(lock->lk_type);
5240 status = nfs4_check_openmode(lock_stp, lkflg);
5244 status = nfserr_grace;
5245 if (locks_in_grace(net) && !lock->lk_reclaim)
5247 status = nfserr_no_grace;
5248 if (!locks_in_grace(net) && lock->lk_reclaim)
5251 file_lock = locks_alloc_lock();
5253 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5254 status = nfserr_jukebox;
5258 fp = lock_stp->st_stid.sc_file;
5259 locks_init_lock(file_lock);
5260 switch (lock->lk_type) {
5263 spin_lock(&fp->fi_lock);
5264 filp = find_readable_file_locked(fp);
5266 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5267 spin_unlock(&fp->fi_lock);
5268 file_lock->fl_type = F_RDLCK;
5271 case NFS4_WRITEW_LT:
5272 spin_lock(&fp->fi_lock);
5273 filp = find_writeable_file_locked(fp);
5275 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
5276 spin_unlock(&fp->fi_lock);
5277 file_lock->fl_type = F_WRLCK;
5280 status = nfserr_inval;
5284 status = nfserr_openmode;
5287 file_lock->fl_owner = (fl_owner_t)lock_sop;
5288 file_lock->fl_pid = current->tgid;
5289 file_lock->fl_file = filp;
5290 file_lock->fl_flags = FL_POSIX;
5291 file_lock->fl_lmops = &nfsd_posix_mng_ops;
5292 file_lock->fl_start = lock->lk_offset;
5293 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
5294 nfs4_transform_lock_offset(file_lock);
5296 conflock = locks_alloc_lock();
5298 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5299 status = nfserr_jukebox;
5303 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
5305 case 0: /* success! */
5306 update_stateid(&lock_stp->st_stid.sc_stateid);
5307 memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_stateid,
5311 case (EAGAIN): /* conflock holds conflicting lock */
5312 status = nfserr_denied;
5313 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
5314 nfs4_set_lock_denied(conflock, &lock->lk_denied);
5317 status = nfserr_deadlock;
5320 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
5321 status = nfserrno(err);
5328 /* Bump seqid manually if the 4.0 replay owner is openowner */
5329 if (cstate->replay_owner &&
5330 cstate->replay_owner != &lock_sop->lo_owner &&
5331 seqid_mutating_err(ntohl(status)))
5332 lock_sop->lo_owner.so_seqid++;
5335 * If this is a new, never-before-used stateid, and we are
5336 * returning an error, then just go ahead and release it.
5339 release_lock_stateid(lock_stp);
5341 nfs4_put_stid(&lock_stp->st_stid);
5344 nfs4_put_stid(&open_stp->st_stid);
5345 nfsd4_bump_seqid(cstate, status);
5347 locks_free_lock(file_lock);
5349 locks_free_lock(conflock);
5354 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
5355 * so we do a temporary open here just to get an open file to pass to
5356 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
5359 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
5362 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
5364 err = nfserrno(vfs_test_lock(file, lock));
5374 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5375 struct nfsd4_lockt *lockt)
5377 struct file_lock *file_lock = NULL;
5378 struct nfs4_lockowner *lo = NULL;
5380 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5382 if (locks_in_grace(SVC_NET(rqstp)))
5383 return nfserr_grace;
5385 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
5386 return nfserr_inval;
5388 if (!nfsd4_has_session(cstate)) {
5389 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
5394 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5397 file_lock = locks_alloc_lock();
5399 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5400 status = nfserr_jukebox;
5403 locks_init_lock(file_lock);
5404 switch (lockt->lt_type) {
5407 file_lock->fl_type = F_RDLCK;
5410 case NFS4_WRITEW_LT:
5411 file_lock->fl_type = F_WRLCK;
5414 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
5415 status = nfserr_inval;
5419 lo = find_lockowner_str(&lockt->lt_clientid, &lockt->lt_owner,
5422 file_lock->fl_owner = (fl_owner_t)lo;
5423 file_lock->fl_pid = current->tgid;
5424 file_lock->fl_flags = FL_POSIX;
5426 file_lock->fl_start = lockt->lt_offset;
5427 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
5429 nfs4_transform_lock_offset(file_lock);
5431 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
5435 if (file_lock->fl_type != F_UNLCK) {
5436 status = nfserr_denied;
5437 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
5441 nfs4_put_stateowner(&lo->lo_owner);
5443 locks_free_lock(file_lock);
5448 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5449 struct nfsd4_locku *locku)
5451 struct nfs4_ol_stateid *stp;
5452 struct file *filp = NULL;
5453 struct file_lock *file_lock = NULL;
5456 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5458 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
5459 (long long) locku->lu_offset,
5460 (long long) locku->lu_length);
5462 if (check_lock_length(locku->lu_offset, locku->lu_length))
5463 return nfserr_inval;
5465 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
5466 &locku->lu_stateid, NFS4_LOCK_STID,
5470 filp = find_any_file(stp->st_stid.sc_file);
5472 status = nfserr_lock_range;
5475 file_lock = locks_alloc_lock();
5477 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5478 status = nfserr_jukebox;
5481 locks_init_lock(file_lock);
5482 file_lock->fl_type = F_UNLCK;
5483 file_lock->fl_owner = (fl_owner_t)lockowner(stp->st_stateowner);
5484 file_lock->fl_pid = current->tgid;
5485 file_lock->fl_file = filp;
5486 file_lock->fl_flags = FL_POSIX;
5487 file_lock->fl_lmops = &nfsd_posix_mng_ops;
5488 file_lock->fl_start = locku->lu_offset;
5490 file_lock->fl_end = last_byte_offset(locku->lu_offset,
5492 nfs4_transform_lock_offset(file_lock);
5494 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
5496 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
5499 update_stateid(&stp->st_stid.sc_stateid);
5500 memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
5504 nfs4_put_stid(&stp->st_stid);
5506 nfsd4_bump_seqid(cstate, status);
5508 locks_free_lock(file_lock);
5512 status = nfserrno(err);
5518 * true: locks held by lockowner
5519 * false: no locks held by lockowner
5522 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
5524 struct file_lock **flpp;
5526 struct file *filp = find_any_file(fp);
5527 struct inode *inode;
5530 /* Any valid lock stateid should have some sort of access */
5535 inode = file_inode(filp);
5537 spin_lock(&inode->i_lock);
5538 for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
5539 if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
5544 spin_unlock(&inode->i_lock);
5550 nfsd4_release_lockowner(struct svc_rqst *rqstp,
5551 struct nfsd4_compound_state *cstate,
5552 struct nfsd4_release_lockowner *rlockowner)
5554 clientid_t *clid = &rlockowner->rl_clientid;
5555 struct nfs4_stateowner *sop;
5556 struct nfs4_lockowner *lo = NULL;
5557 struct nfs4_ol_stateid *stp;
5558 struct xdr_netobj *owner = &rlockowner->rl_owner;
5559 unsigned int hashval = ownerstr_hashval(owner);
5561 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5562 struct nfs4_client *clp;
5564 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
5565 clid->cl_boot, clid->cl_id);
5567 status = lookup_clientid(clid, cstate, nn);
5572 /* Find the matching lock stateowner */
5573 spin_lock(&clp->cl_lock);
5574 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
5577 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
5580 /* see if there are still any locks associated with it */
5581 lo = lockowner(sop);
5582 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
5583 if (check_for_locks(stp->st_stid.sc_file, lo)) {
5584 status = nfserr_locks_held;
5585 spin_unlock(&clp->cl_lock);
5590 atomic_inc(&sop->so_count);
5593 spin_unlock(&clp->cl_lock);
5595 release_lockowner(lo);
5599 static inline struct nfs4_client_reclaim *
5602 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
5606 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
5608 struct nfs4_client_reclaim *crp;
5610 crp = nfsd4_find_reclaim_client(name, nn);
5611 return (crp && crp->cr_clp);
5615 * failure => all reset bets are off, nfserr_no_grace...
5617 struct nfs4_client_reclaim *
5618 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
5620 unsigned int strhashval;
5621 struct nfs4_client_reclaim *crp;
5623 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
5624 crp = alloc_reclaim();
5626 strhashval = clientstr_hashval(name);
5627 INIT_LIST_HEAD(&crp->cr_strhash);
5628 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
5629 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
5631 nn->reclaim_str_hashtbl_size++;
5637 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
5639 list_del(&crp->cr_strhash);
5641 nn->reclaim_str_hashtbl_size--;
5645 nfs4_release_reclaim(struct nfsd_net *nn)
5647 struct nfs4_client_reclaim *crp = NULL;
5650 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
5651 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
5652 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
5653 struct nfs4_client_reclaim, cr_strhash);
5654 nfs4_remove_reclaim_record(crp, nn);
5657 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
5661 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
5662 struct nfs4_client_reclaim *
5663 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
5665 unsigned int strhashval;
5666 struct nfs4_client_reclaim *crp = NULL;
5668 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
5670 strhashval = clientstr_hashval(recdir);
5671 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
5672 if (same_name(crp->cr_recdir, recdir)) {
5680 * Called from OPEN. Look for clientid in reclaim list.
5683 nfs4_check_open_reclaim(clientid_t *clid,
5684 struct nfsd4_compound_state *cstate,
5685 struct nfsd_net *nn)
5689 /* find clientid in conf_id_hashtbl */
5690 status = lookup_clientid(clid, cstate, nn);
5692 return nfserr_reclaim_bad;
5694 if (nfsd4_client_record_check(cstate->clp))
5695 return nfserr_reclaim_bad;
5700 #ifdef CONFIG_NFSD_FAULT_INJECTION
5702 put_client(struct nfs4_client *clp)
5704 atomic_dec(&clp->cl_refcount);
5707 static struct nfs4_client *
5708 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
5710 struct nfs4_client *clp;
5711 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5714 if (!nfsd_netns_ready(nn))
5717 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
5718 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
5725 nfsd_inject_print_clients(void)
5727 struct nfs4_client *clp;
5729 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5731 char buf[INET6_ADDRSTRLEN];
5733 if (!nfsd_netns_ready(nn))
5736 spin_lock(&nn->client_lock);
5737 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
5738 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
5739 pr_info("NFS Client: %s\n", buf);
5742 spin_unlock(&nn->client_lock);
5748 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
5751 struct nfs4_client *clp;
5752 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5755 if (!nfsd_netns_ready(nn))
5758 spin_lock(&nn->client_lock);
5759 clp = nfsd_find_client(addr, addr_size);
5761 if (mark_client_expired_locked(clp) == nfs_ok)
5766 spin_unlock(&nn->client_lock);
5775 nfsd_inject_forget_clients(u64 max)
5778 struct nfs4_client *clp, *next;
5779 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5781 LIST_HEAD(reaplist);
5783 if (!nfsd_netns_ready(nn))
5786 spin_lock(&nn->client_lock);
5787 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
5788 if (mark_client_expired_locked(clp) == nfs_ok) {
5789 list_add(&clp->cl_lru, &reaplist);
5790 if (max != 0 && ++count >= max)
5794 spin_unlock(&nn->client_lock);
5796 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
5802 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
5805 char buf[INET6_ADDRSTRLEN];
5806 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
5807 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
5811 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
5812 struct list_head *collect)
5814 struct nfs4_client *clp = lst->st_stid.sc_client;
5815 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5821 lockdep_assert_held(&nn->client_lock);
5822 atomic_inc(&clp->cl_refcount);
5823 list_add(&lst->st_locks, collect);
5826 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
5827 struct list_head *collect,
5828 void (*func)(struct nfs4_ol_stateid *))
5830 struct nfs4_openowner *oop;
5831 struct nfs4_ol_stateid *stp, *st_next;
5832 struct nfs4_ol_stateid *lst, *lst_next;
5835 spin_lock(&clp->cl_lock);
5836 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
5837 list_for_each_entry_safe(stp, st_next,
5838 &oop->oo_owner.so_stateids, st_perstateowner) {
5839 list_for_each_entry_safe(lst, lst_next,
5840 &stp->st_locks, st_locks) {
5843 nfsd_inject_add_lock_to_list(lst,
5848 * Despite the fact that these functions deal
5849 * with 64-bit integers for "count", we must
5850 * ensure that it doesn't blow up the
5851 * clp->cl_refcount. Throw a warning if we
5852 * start to approach INT_MAX here.
5854 WARN_ON_ONCE(count == (INT_MAX / 2));
5861 spin_unlock(&clp->cl_lock);
5867 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
5870 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
5874 nfsd_print_client_locks(struct nfs4_client *clp)
5876 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
5877 nfsd_print_count(clp, count, "locked files");
5882 nfsd_inject_print_locks(void)
5884 struct nfs4_client *clp;
5886 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5889 if (!nfsd_netns_ready(nn))
5892 spin_lock(&nn->client_lock);
5893 list_for_each_entry(clp, &nn->client_lru, cl_lru)
5894 count += nfsd_print_client_locks(clp);
5895 spin_unlock(&nn->client_lock);
5901 nfsd_reap_locks(struct list_head *reaplist)
5903 struct nfs4_client *clp;
5904 struct nfs4_ol_stateid *stp, *next;
5906 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
5907 list_del_init(&stp->st_locks);
5908 clp = stp->st_stid.sc_client;
5909 nfs4_put_stid(&stp->st_stid);
5915 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
5917 unsigned int count = 0;
5918 struct nfs4_client *clp;
5919 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5921 LIST_HEAD(reaplist);
5923 if (!nfsd_netns_ready(nn))
5926 spin_lock(&nn->client_lock);
5927 clp = nfsd_find_client(addr, addr_size);
5929 count = nfsd_collect_client_locks(clp, &reaplist, 0);
5930 spin_unlock(&nn->client_lock);
5931 nfsd_reap_locks(&reaplist);
5936 nfsd_inject_forget_locks(u64 max)
5939 struct nfs4_client *clp;
5940 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5942 LIST_HEAD(reaplist);
5944 if (!nfsd_netns_ready(nn))
5947 spin_lock(&nn->client_lock);
5948 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
5949 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
5950 if (max != 0 && count >= max)
5953 spin_unlock(&nn->client_lock);
5954 nfsd_reap_locks(&reaplist);
5959 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
5960 struct list_head *collect,
5961 void (*func)(struct nfs4_openowner *))
5963 struct nfs4_openowner *oop, *next;
5964 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
5968 lockdep_assert_held(&nn->client_lock);
5970 spin_lock(&clp->cl_lock);
5971 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
5975 atomic_inc(&clp->cl_refcount);
5976 list_add(&oop->oo_perclient, collect);
5981 * Despite the fact that these functions deal with
5982 * 64-bit integers for "count", we must ensure that
5983 * it doesn't blow up the clp->cl_refcount. Throw a
5984 * warning if we start to approach INT_MAX here.
5986 WARN_ON_ONCE(count == (INT_MAX / 2));
5990 spin_unlock(&clp->cl_lock);
5996 nfsd_print_client_openowners(struct nfs4_client *clp)
5998 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6000 nfsd_print_count(clp, count, "openowners");
6005 nfsd_collect_client_openowners(struct nfs4_client *clp,
6006 struct list_head *collect, u64 max)
6008 return nfsd_foreach_client_openowner(clp, max, collect,
6009 unhash_openowner_locked);
6013 nfsd_inject_print_openowners(void)
6015 struct nfs4_client *clp;
6017 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6020 if (!nfsd_netns_ready(nn))
6023 spin_lock(&nn->client_lock);
6024 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6025 count += nfsd_print_client_openowners(clp);
6026 spin_unlock(&nn->client_lock);
6032 nfsd_reap_openowners(struct list_head *reaplist)
6034 struct nfs4_client *clp;
6035 struct nfs4_openowner *oop, *next;
6037 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6038 list_del_init(&oop->oo_perclient);
6039 clp = oop->oo_owner.so_client;
6040 release_openowner(oop);
6046 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6049 unsigned int count = 0;
6050 struct nfs4_client *clp;
6051 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6053 LIST_HEAD(reaplist);
6055 if (!nfsd_netns_ready(nn))
6058 spin_lock(&nn->client_lock);
6059 clp = nfsd_find_client(addr, addr_size);
6061 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6062 spin_unlock(&nn->client_lock);
6063 nfsd_reap_openowners(&reaplist);
6068 nfsd_inject_forget_openowners(u64 max)
6071 struct nfs4_client *clp;
6072 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6074 LIST_HEAD(reaplist);
6076 if (!nfsd_netns_ready(nn))
6079 spin_lock(&nn->client_lock);
6080 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6081 count += nfsd_collect_client_openowners(clp, &reaplist,
6083 if (max != 0 && count >= max)
6086 spin_unlock(&nn->client_lock);
6087 nfsd_reap_openowners(&reaplist);
6091 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6092 struct list_head *victims)
6094 struct nfs4_delegation *dp, *next;
6095 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6099 lockdep_assert_held(&nn->client_lock);
6101 spin_lock(&state_lock);
6102 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6105 * It's not safe to mess with delegations that have a
6106 * non-zero dl_time. They might have already been broken
6107 * and could be processed by the laundromat outside of
6108 * the state_lock. Just leave them be.
6110 if (dp->dl_time != 0)
6113 atomic_inc(&clp->cl_refcount);
6114 unhash_delegation_locked(dp);
6115 list_add(&dp->dl_recall_lru, victims);
6119 * Despite the fact that these functions deal with
6120 * 64-bit integers for "count", we must ensure that
6121 * it doesn't blow up the clp->cl_refcount. Throw a
6122 * warning if we start to approach INT_MAX here.
6124 WARN_ON_ONCE(count == (INT_MAX / 2));
6128 spin_unlock(&state_lock);
6133 nfsd_print_client_delegations(struct nfs4_client *clp)
6135 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6137 nfsd_print_count(clp, count, "delegations");
6142 nfsd_inject_print_delegations(void)
6144 struct nfs4_client *clp;
6146 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6149 if (!nfsd_netns_ready(nn))
6152 spin_lock(&nn->client_lock);
6153 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6154 count += nfsd_print_client_delegations(clp);
6155 spin_unlock(&nn->client_lock);
6161 nfsd_forget_delegations(struct list_head *reaplist)
6163 struct nfs4_client *clp;
6164 struct nfs4_delegation *dp, *next;
6166 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6167 list_del_init(&dp->dl_recall_lru);
6168 clp = dp->dl_stid.sc_client;
6169 revoke_delegation(dp);
6175 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6179 struct nfs4_client *clp;
6180 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6182 LIST_HEAD(reaplist);
6184 if (!nfsd_netns_ready(nn))
6187 spin_lock(&nn->client_lock);
6188 clp = nfsd_find_client(addr, addr_size);
6190 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6191 spin_unlock(&nn->client_lock);
6193 nfsd_forget_delegations(&reaplist);
6198 nfsd_inject_forget_delegations(u64 max)
6201 struct nfs4_client *clp;
6202 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6204 LIST_HEAD(reaplist);
6206 if (!nfsd_netns_ready(nn))
6209 spin_lock(&nn->client_lock);
6210 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6211 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6212 if (max != 0 && count >= max)
6215 spin_unlock(&nn->client_lock);
6216 nfsd_forget_delegations(&reaplist);
6221 nfsd_recall_delegations(struct list_head *reaplist)
6223 struct nfs4_client *clp;
6224 struct nfs4_delegation *dp, *next;
6226 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6227 list_del_init(&dp->dl_recall_lru);
6228 clp = dp->dl_stid.sc_client;
6230 * We skipped all entries that had a zero dl_time before,
6231 * so we can now reset the dl_time back to 0. If a delegation
6232 * break comes in now, then it won't make any difference since
6233 * we're recalling it either way.
6235 spin_lock(&state_lock);
6237 spin_unlock(&state_lock);
6238 nfsd_break_one_deleg(dp);
6244 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
6248 struct nfs4_client *clp;
6249 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6251 LIST_HEAD(reaplist);
6253 if (!nfsd_netns_ready(nn))
6256 spin_lock(&nn->client_lock);
6257 clp = nfsd_find_client(addr, addr_size);
6259 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6260 spin_unlock(&nn->client_lock);
6262 nfsd_recall_delegations(&reaplist);
6267 nfsd_inject_recall_delegations(u64 max)
6270 struct nfs4_client *clp, *next;
6271 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6273 LIST_HEAD(reaplist);
6275 if (!nfsd_netns_ready(nn))
6278 spin_lock(&nn->client_lock);
6279 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6280 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6281 if (max != 0 && ++count >= max)
6284 spin_unlock(&nn->client_lock);
6285 nfsd_recall_delegations(&reaplist);
6288 #endif /* CONFIG_NFSD_FAULT_INJECTION */
6291 * Since the lifetime of a delegation isn't limited to that of an open, a
6292 * client may quite reasonably hang on to a delegation as long as it has
6293 * the inode cached. This becomes an obvious problem the first time a
6294 * client's inode cache approaches the size of the server's total memory.
6296 * For now we avoid this problem by imposing a hard limit on the number
6297 * of delegations, which varies according to the server's memory size.
6300 set_max_delegations(void)
6303 * Allow at most 4 delegations per megabyte of RAM. Quick
6304 * estimates suggest that in the worst case (where every delegation
6305 * is for a different inode), a delegation could take about 1.5K,
6306 * giving a worst case usage of about 6% of memory.
6308 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
6311 static int nfs4_state_create_net(struct net *net)
6313 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6316 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6317 CLIENT_HASH_SIZE, GFP_KERNEL);
6318 if (!nn->conf_id_hashtbl)
6320 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6321 CLIENT_HASH_SIZE, GFP_KERNEL);
6322 if (!nn->unconf_id_hashtbl)
6324 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
6325 SESSION_HASH_SIZE, GFP_KERNEL);
6326 if (!nn->sessionid_hashtbl)
6329 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6330 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
6331 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
6333 for (i = 0; i < SESSION_HASH_SIZE; i++)
6334 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
6335 nn->conf_name_tree = RB_ROOT;
6336 nn->unconf_name_tree = RB_ROOT;
6337 INIT_LIST_HEAD(&nn->client_lru);
6338 INIT_LIST_HEAD(&nn->close_lru);
6339 INIT_LIST_HEAD(&nn->del_recall_lru);
6340 spin_lock_init(&nn->client_lock);
6342 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
6348 kfree(nn->unconf_id_hashtbl);
6350 kfree(nn->conf_id_hashtbl);
6356 nfs4_state_destroy_net(struct net *net)
6359 struct nfs4_client *clp = NULL;
6360 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6362 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6363 while (!list_empty(&nn->conf_id_hashtbl[i])) {
6364 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6365 destroy_client(clp);
6369 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6370 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
6371 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6372 destroy_client(clp);
6376 kfree(nn->sessionid_hashtbl);
6377 kfree(nn->unconf_id_hashtbl);
6378 kfree(nn->conf_id_hashtbl);
6383 nfs4_state_start_net(struct net *net)
6385 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6388 ret = nfs4_state_create_net(net);
6391 nfsd4_client_tracking_init(net);
6392 nn->boot_time = get_seconds();
6393 locks_start_grace(net, &nn->nfsd4_manager);
6394 nn->grace_ended = false;
6395 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
6396 nn->nfsd4_grace, net);
6397 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
6401 /* initialization to perform when the nfsd service is started: */
6404 nfs4_state_start(void)
6408 ret = set_callback_cred();
6411 laundry_wq = create_singlethread_workqueue("nfsd4");
6412 if (laundry_wq == NULL) {
6416 ret = nfsd4_create_callback_queue();
6418 goto out_free_laundry;
6420 set_max_delegations();
6425 destroy_workqueue(laundry_wq);
6431 nfs4_state_shutdown_net(struct net *net)
6433 struct nfs4_delegation *dp = NULL;
6434 struct list_head *pos, *next, reaplist;
6435 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6437 cancel_delayed_work_sync(&nn->laundromat_work);
6438 locks_end_grace(&nn->nfsd4_manager);
6441 INIT_LIST_HEAD(&reaplist);
6442 spin_lock(&state_lock);
6443 list_for_each_safe(pos, next, &nn->del_recall_lru) {
6444 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6445 unhash_delegation_locked(dp);
6446 list_add(&dp->dl_recall_lru, &reaplist);
6448 spin_unlock(&state_lock);
6449 list_for_each_safe(pos, next, &reaplist) {
6450 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6451 list_del_init(&dp->dl_recall_lru);
6452 nfs4_put_stid(&dp->dl_stid);
6455 nfsd4_client_tracking_exit(net);
6456 nfs4_state_destroy_net(net);
6457 nfs4_unlock_state();
6461 nfs4_state_shutdown(void)
6463 destroy_workqueue(laundry_wq);
6464 nfsd4_destroy_callback_queue();
6468 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
6470 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
6471 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
6475 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
6477 if (cstate->minorversion) {
6478 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
6479 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
6484 clear_current_stateid(struct nfsd4_compound_state *cstate)
6486 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
6490 * functions to set current state id
6493 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
6495 put_stateid(cstate, &odp->od_stateid);
6499 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
6501 put_stateid(cstate, &open->op_stateid);
6505 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
6507 put_stateid(cstate, &close->cl_stateid);
6511 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
6513 put_stateid(cstate, &lock->lk_resp_stateid);
6517 * functions to consume current state id
6521 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
6523 get_stateid(cstate, &odp->od_stateid);
6527 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
6529 get_stateid(cstate, &drp->dr_stateid);
6533 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
6535 get_stateid(cstate, &fsp->fr_stateid);
6539 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
6541 get_stateid(cstate, &setattr->sa_stateid);
6545 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
6547 get_stateid(cstate, &close->cl_stateid);
6551 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
6553 get_stateid(cstate, &locku->lu_stateid);
6557 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
6559 get_stateid(cstate, &read->rd_stateid);
6563 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
6565 get_stateid(cstate, &write->wr_stateid);