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/jhash.h>
48 #include "current_stateid.h"
53 #define NFSDDBG_FACILITY NFSDDBG_PROC
55 #define all_ones {{~0,~0},~0}
56 static const stateid_t one_stateid = {
58 .si_opaque = all_ones,
60 static const stateid_t zero_stateid = {
63 static const stateid_t currentstateid = {
66 static const stateid_t close_stateid = {
67 .si_generation = 0xffffffffU,
70 static u64 current_sessionid = 1;
72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
73 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
74 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
76 /* forward declarations */
77 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
78 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
83 * Currently used for the del_recall_lru and file hash table. In an
84 * effort to decrease the scope of the client_mutex, this spinlock may
85 * eventually cover more:
87 static DEFINE_SPINLOCK(state_lock);
89 enum nfsd4_st_mutex_lock_subclass {
90 OPEN_STATEID_MUTEX = 0,
91 LOCK_STATEID_MUTEX = 1,
95 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
96 * the refcount on the open stateid to drop.
98 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
100 static struct kmem_cache *openowner_slab;
101 static struct kmem_cache *lockowner_slab;
102 static struct kmem_cache *file_slab;
103 static struct kmem_cache *stateid_slab;
104 static struct kmem_cache *deleg_slab;
105 static struct kmem_cache *odstate_slab;
107 static void free_session(struct nfsd4_session *);
109 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
110 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
112 static bool is_session_dead(struct nfsd4_session *ses)
114 return ses->se_flags & NFS4_SESSION_DEAD;
117 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
119 if (atomic_read(&ses->se_ref) > ref_held_by_me)
120 return nfserr_jukebox;
121 ses->se_flags |= NFS4_SESSION_DEAD;
125 static bool is_client_expired(struct nfs4_client *clp)
127 return clp->cl_time == 0;
130 static __be32 get_client_locked(struct nfs4_client *clp)
132 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
134 lockdep_assert_held(&nn->client_lock);
136 if (is_client_expired(clp))
137 return nfserr_expired;
138 atomic_inc(&clp->cl_refcount);
142 /* must be called under the client_lock */
144 renew_client_locked(struct nfs4_client *clp)
146 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
148 if (is_client_expired(clp)) {
150 printk("%s: client (clientid %08x/%08x) already expired\n",
152 clp->cl_clientid.cl_boot,
153 clp->cl_clientid.cl_id);
157 dprintk("renewing client (clientid %08x/%08x)\n",
158 clp->cl_clientid.cl_boot,
159 clp->cl_clientid.cl_id);
160 list_move_tail(&clp->cl_lru, &nn->client_lru);
161 clp->cl_time = get_seconds();
164 static void put_client_renew_locked(struct nfs4_client *clp)
166 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
168 lockdep_assert_held(&nn->client_lock);
170 if (!atomic_dec_and_test(&clp->cl_refcount))
172 if (!is_client_expired(clp))
173 renew_client_locked(clp);
176 static void put_client_renew(struct nfs4_client *clp)
178 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
180 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
182 if (!is_client_expired(clp))
183 renew_client_locked(clp);
184 spin_unlock(&nn->client_lock);
187 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
191 if (is_session_dead(ses))
192 return nfserr_badsession;
193 status = get_client_locked(ses->se_client);
196 atomic_inc(&ses->se_ref);
200 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
202 struct nfs4_client *clp = ses->se_client;
203 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
205 lockdep_assert_held(&nn->client_lock);
207 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
209 put_client_renew_locked(clp);
212 static void nfsd4_put_session(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 spin_lock(&nn->client_lock);
218 nfsd4_put_session_locked(ses);
219 spin_unlock(&nn->client_lock);
222 static struct nfsd4_blocked_lock *
223 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
226 struct nfsd4_blocked_lock *cur, *found = NULL;
228 spin_lock(&nn->blocked_locks_lock);
229 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
230 if (fh_match(fh, &cur->nbl_fh)) {
231 list_del_init(&cur->nbl_list);
232 list_del_init(&cur->nbl_lru);
237 spin_unlock(&nn->blocked_locks_lock);
239 posix_unblock_lock(&found->nbl_lock);
243 static struct nfsd4_blocked_lock *
244 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
247 struct nfsd4_blocked_lock *nbl;
249 nbl = find_blocked_lock(lo, fh, nn);
251 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
253 fh_copy_shallow(&nbl->nbl_fh, fh);
254 locks_init_lock(&nbl->nbl_lock);
255 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
256 &nfsd4_cb_notify_lock_ops,
257 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
264 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
266 locks_release_private(&nbl->nbl_lock);
271 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
274 * Since this is just an optimization, we don't try very hard if it
275 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
276 * just quit trying on anything else.
278 switch (task->tk_status) {
280 rpc_delay(task, 1 * HZ);
288 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
290 struct nfsd4_blocked_lock *nbl = container_of(cb,
291 struct nfsd4_blocked_lock, nbl_cb);
293 free_blocked_lock(nbl);
296 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
297 .done = nfsd4_cb_notify_lock_done,
298 .release = nfsd4_cb_notify_lock_release,
301 static inline struct nfs4_stateowner *
302 nfs4_get_stateowner(struct nfs4_stateowner *sop)
304 atomic_inc(&sop->so_count);
309 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
311 return (sop->so_owner.len == owner->len) &&
312 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
315 static struct nfs4_openowner *
316 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
317 struct nfs4_client *clp)
319 struct nfs4_stateowner *so;
321 lockdep_assert_held(&clp->cl_lock);
323 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
325 if (!so->so_is_open_owner)
327 if (same_owner_str(so, &open->op_owner))
328 return openowner(nfs4_get_stateowner(so));
333 static struct nfs4_openowner *
334 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
335 struct nfs4_client *clp)
337 struct nfs4_openowner *oo;
339 spin_lock(&clp->cl_lock);
340 oo = find_openstateowner_str_locked(hashval, open, clp);
341 spin_unlock(&clp->cl_lock);
346 opaque_hashval(const void *ptr, int nbytes)
348 unsigned char *cptr = (unsigned char *) ptr;
358 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
360 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
362 kmem_cache_free(file_slab, fp);
366 put_nfs4_file(struct nfs4_file *fi)
368 might_lock(&state_lock);
370 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
371 hlist_del_rcu(&fi->fi_hash);
372 spin_unlock(&state_lock);
373 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
374 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
375 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
380 __nfs4_get_fd(struct nfs4_file *f, int oflag)
382 if (f->fi_fds[oflag])
383 return get_file(f->fi_fds[oflag]);
388 find_writeable_file_locked(struct nfs4_file *f)
392 lockdep_assert_held(&f->fi_lock);
394 ret = __nfs4_get_fd(f, O_WRONLY);
396 ret = __nfs4_get_fd(f, O_RDWR);
401 find_writeable_file(struct nfs4_file *f)
405 spin_lock(&f->fi_lock);
406 ret = find_writeable_file_locked(f);
407 spin_unlock(&f->fi_lock);
412 static struct file *find_readable_file_locked(struct nfs4_file *f)
416 lockdep_assert_held(&f->fi_lock);
418 ret = __nfs4_get_fd(f, O_RDONLY);
420 ret = __nfs4_get_fd(f, O_RDWR);
425 find_readable_file(struct nfs4_file *f)
429 spin_lock(&f->fi_lock);
430 ret = find_readable_file_locked(f);
431 spin_unlock(&f->fi_lock);
437 find_any_file(struct nfs4_file *f)
441 spin_lock(&f->fi_lock);
442 ret = __nfs4_get_fd(f, O_RDWR);
444 ret = __nfs4_get_fd(f, O_WRONLY);
446 ret = __nfs4_get_fd(f, O_RDONLY);
448 spin_unlock(&f->fi_lock);
452 static atomic_long_t num_delegations;
453 unsigned long max_delegations;
456 * Open owner state (share locks)
459 /* hash tables for lock and open owners */
460 #define OWNER_HASH_BITS 8
461 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
462 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
464 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
468 ret = opaque_hashval(ownername->data, ownername->len);
469 return ret & OWNER_HASH_MASK;
472 /* hash table for nfs4_file */
473 #define FILE_HASH_BITS 8
474 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
476 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
478 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
481 static unsigned int file_hashval(struct knfsd_fh *fh)
483 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
486 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
489 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
491 lockdep_assert_held(&fp->fi_lock);
493 if (access & NFS4_SHARE_ACCESS_WRITE)
494 atomic_inc(&fp->fi_access[O_WRONLY]);
495 if (access & NFS4_SHARE_ACCESS_READ)
496 atomic_inc(&fp->fi_access[O_RDONLY]);
500 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
502 lockdep_assert_held(&fp->fi_lock);
504 /* Does this access mode make sense? */
505 if (access & ~NFS4_SHARE_ACCESS_BOTH)
508 /* Does it conflict with a deny mode already set? */
509 if ((access & fp->fi_share_deny) != 0)
510 return nfserr_share_denied;
512 __nfs4_file_get_access(fp, access);
516 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
518 /* Common case is that there is no deny mode. */
520 /* Does this deny mode make sense? */
521 if (deny & ~NFS4_SHARE_DENY_BOTH)
524 if ((deny & NFS4_SHARE_DENY_READ) &&
525 atomic_read(&fp->fi_access[O_RDONLY]))
526 return nfserr_share_denied;
528 if ((deny & NFS4_SHARE_DENY_WRITE) &&
529 atomic_read(&fp->fi_access[O_WRONLY]))
530 return nfserr_share_denied;
535 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
537 might_lock(&fp->fi_lock);
539 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
540 struct file *f1 = NULL;
541 struct file *f2 = NULL;
543 swap(f1, fp->fi_fds[oflag]);
544 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
545 swap(f2, fp->fi_fds[O_RDWR]);
546 spin_unlock(&fp->fi_lock);
554 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
556 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
558 if (access & NFS4_SHARE_ACCESS_WRITE)
559 __nfs4_file_put_access(fp, O_WRONLY);
560 if (access & NFS4_SHARE_ACCESS_READ)
561 __nfs4_file_put_access(fp, O_RDONLY);
565 * Allocate a new open/delegation state counter. This is needed for
566 * pNFS for proper return on close semantics.
568 * Note that we only allocate it for pNFS-enabled exports, otherwise
569 * all pointers to struct nfs4_clnt_odstate are always NULL.
571 static struct nfs4_clnt_odstate *
572 alloc_clnt_odstate(struct nfs4_client *clp)
574 struct nfs4_clnt_odstate *co;
576 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
579 refcount_set(&co->co_odcount, 1);
585 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
587 struct nfs4_file *fp = co->co_file;
589 lockdep_assert_held(&fp->fi_lock);
590 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
594 get_clnt_odstate(struct nfs4_clnt_odstate *co)
597 refcount_inc(&co->co_odcount);
601 put_clnt_odstate(struct nfs4_clnt_odstate *co)
603 struct nfs4_file *fp;
609 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
610 list_del(&co->co_perfile);
611 spin_unlock(&fp->fi_lock);
613 nfsd4_return_all_file_layouts(co->co_client, fp);
614 kmem_cache_free(odstate_slab, co);
618 static struct nfs4_clnt_odstate *
619 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
621 struct nfs4_clnt_odstate *co;
622 struct nfs4_client *cl;
629 spin_lock(&fp->fi_lock);
630 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
631 if (co->co_client == cl) {
632 get_clnt_odstate(co);
638 hash_clnt_odstate_locked(new);
640 spin_unlock(&fp->fi_lock);
644 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
645 void (*sc_free)(struct nfs4_stid *))
647 struct nfs4_stid *stid;
650 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
654 idr_preload(GFP_KERNEL);
655 spin_lock(&cl->cl_lock);
656 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
657 spin_unlock(&cl->cl_lock);
662 stid->sc_free = sc_free;
663 stid->sc_client = cl;
664 stid->sc_stateid.si_opaque.so_id = new_id;
665 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
666 /* Will be incremented before return to client: */
667 refcount_set(&stid->sc_count, 1);
668 spin_lock_init(&stid->sc_lock);
671 * It shouldn't be a problem to reuse an opaque stateid value.
672 * I don't think it is for 4.1. But with 4.0 I worry that, for
673 * example, a stray write retransmission could be accepted by
674 * the server when it should have been rejected. Therefore,
675 * adopt a trick from the sctp code to attempt to maximize the
676 * amount of time until an id is reused, by ensuring they always
677 * "increase" (mod INT_MAX):
681 kmem_cache_free(slab, stid);
685 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
687 struct nfs4_stid *stid;
689 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
693 return openlockstateid(stid);
696 static void nfs4_free_deleg(struct nfs4_stid *stid)
698 kmem_cache_free(deleg_slab, stid);
699 atomic_long_dec(&num_delegations);
703 * When we recall a delegation, we should be careful not to hand it
704 * out again straight away.
705 * To ensure this we keep a pair of bloom filters ('new' and 'old')
706 * in which the filehandles of recalled delegations are "stored".
707 * If a filehandle appear in either filter, a delegation is blocked.
708 * When a delegation is recalled, the filehandle is stored in the "new"
710 * Every 30 seconds we swap the filters and clear the "new" one,
711 * unless both are empty of course.
713 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
714 * low 3 bytes as hash-table indices.
716 * 'blocked_delegations_lock', which is always taken in block_delegations(),
717 * is used to manage concurrent access. Testing does not need the lock
718 * except when swapping the two filters.
720 static DEFINE_SPINLOCK(blocked_delegations_lock);
721 static struct bloom_pair {
722 int entries, old_entries;
724 int new; /* index into 'set' */
725 DECLARE_BITMAP(set[2], 256);
726 } blocked_delegations;
728 static int delegation_blocked(struct knfsd_fh *fh)
731 struct bloom_pair *bd = &blocked_delegations;
733 if (bd->entries == 0)
735 if (seconds_since_boot() - bd->swap_time > 30) {
736 spin_lock(&blocked_delegations_lock);
737 if (seconds_since_boot() - bd->swap_time > 30) {
738 bd->entries -= bd->old_entries;
739 bd->old_entries = bd->entries;
740 memset(bd->set[bd->new], 0,
743 bd->swap_time = seconds_since_boot();
745 spin_unlock(&blocked_delegations_lock);
747 hash = jhash(&fh->fh_base, fh->fh_size, 0);
748 if (test_bit(hash&255, bd->set[0]) &&
749 test_bit((hash>>8)&255, bd->set[0]) &&
750 test_bit((hash>>16)&255, bd->set[0]))
753 if (test_bit(hash&255, bd->set[1]) &&
754 test_bit((hash>>8)&255, bd->set[1]) &&
755 test_bit((hash>>16)&255, bd->set[1]))
761 static void block_delegations(struct knfsd_fh *fh)
764 struct bloom_pair *bd = &blocked_delegations;
766 hash = jhash(&fh->fh_base, fh->fh_size, 0);
768 spin_lock(&blocked_delegations_lock);
769 __set_bit(hash&255, bd->set[bd->new]);
770 __set_bit((hash>>8)&255, bd->set[bd->new]);
771 __set_bit((hash>>16)&255, bd->set[bd->new]);
772 if (bd->entries == 0)
773 bd->swap_time = seconds_since_boot();
775 spin_unlock(&blocked_delegations_lock);
778 static struct nfs4_delegation *
779 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
780 struct nfs4_clnt_odstate *odstate)
782 struct nfs4_delegation *dp;
785 dprintk("NFSD alloc_init_deleg\n");
786 n = atomic_long_inc_return(&num_delegations);
787 if (n < 0 || n > max_delegations)
789 if (delegation_blocked(¤t_fh->fh_handle))
791 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
796 * delegation seqid's are never incremented. The 4.1 special
797 * meaning of seqid 0 isn't meaningful, really, but let's avoid
798 * 0 anyway just for consistency and use 1:
800 dp->dl_stid.sc_stateid.si_generation = 1;
801 INIT_LIST_HEAD(&dp->dl_perfile);
802 INIT_LIST_HEAD(&dp->dl_perclnt);
803 INIT_LIST_HEAD(&dp->dl_recall_lru);
804 dp->dl_clnt_odstate = odstate;
805 get_clnt_odstate(odstate);
806 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
808 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
809 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
812 atomic_long_dec(&num_delegations);
817 nfs4_put_stid(struct nfs4_stid *s)
819 struct nfs4_file *fp = s->sc_file;
820 struct nfs4_client *clp = s->sc_client;
822 might_lock(&clp->cl_lock);
824 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
825 wake_up_all(&close_wq);
828 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
829 spin_unlock(&clp->cl_lock);
836 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
838 stateid_t *src = &stid->sc_stateid;
840 spin_lock(&stid->sc_lock);
841 if (unlikely(++src->si_generation == 0))
842 src->si_generation = 1;
843 memcpy(dst, src, sizeof(*dst));
844 spin_unlock(&stid->sc_lock);
847 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
849 struct file *filp = NULL;
851 spin_lock(&fp->fi_lock);
852 if (fp->fi_deleg_file && --fp->fi_delegees == 0)
853 swap(filp, fp->fi_deleg_file);
854 spin_unlock(&fp->fi_lock);
857 vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
862 void nfs4_unhash_stid(struct nfs4_stid *s)
868 * nfs4_get_existing_delegation - Discover if this delegation already exists
869 * @clp: a pointer to the nfs4_client we're granting a delegation to
870 * @fp: a pointer to the nfs4_file we're granting a delegation on
873 * On success: NULL if an existing delegation was not found.
875 * On error: -EAGAIN if one was previously granted to this nfs4_client
876 * for this nfs4_file.
881 nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
883 struct nfs4_delegation *searchdp = NULL;
884 struct nfs4_client *searchclp = NULL;
886 lockdep_assert_held(&state_lock);
887 lockdep_assert_held(&fp->fi_lock);
889 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
890 searchclp = searchdp->dl_stid.sc_client;
891 if (clp == searchclp) {
899 * hash_delegation_locked - Add a delegation to the appropriate lists
900 * @dp: a pointer to the nfs4_delegation we are adding.
901 * @fp: a pointer to the nfs4_file we're granting a delegation on
904 * On success: NULL if the delegation was successfully hashed.
906 * On error: -EAGAIN if one was previously granted to this
907 * nfs4_client for this nfs4_file. Delegation is not hashed.
912 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
915 struct nfs4_client *clp = dp->dl_stid.sc_client;
917 lockdep_assert_held(&state_lock);
918 lockdep_assert_held(&fp->fi_lock);
920 status = nfs4_get_existing_delegation(clp, fp);
924 refcount_inc(&dp->dl_stid.sc_count);
925 dp->dl_stid.sc_type = NFS4_DELEG_STID;
926 list_add(&dp->dl_perfile, &fp->fi_delegations);
927 list_add(&dp->dl_perclnt, &clp->cl_delegations);
932 unhash_delegation_locked(struct nfs4_delegation *dp)
934 struct nfs4_file *fp = dp->dl_stid.sc_file;
936 lockdep_assert_held(&state_lock);
938 if (list_empty(&dp->dl_perfile))
941 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
942 /* Ensure that deleg break won't try to requeue it */
944 spin_lock(&fp->fi_lock);
945 list_del_init(&dp->dl_perclnt);
946 list_del_init(&dp->dl_recall_lru);
947 list_del_init(&dp->dl_perfile);
948 spin_unlock(&fp->fi_lock);
952 static void destroy_delegation(struct nfs4_delegation *dp)
956 spin_lock(&state_lock);
957 unhashed = unhash_delegation_locked(dp);
958 spin_unlock(&state_lock);
960 put_clnt_odstate(dp->dl_clnt_odstate);
961 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
962 nfs4_put_stid(&dp->dl_stid);
966 static void revoke_delegation(struct nfs4_delegation *dp)
968 struct nfs4_client *clp = dp->dl_stid.sc_client;
970 WARN_ON(!list_empty(&dp->dl_recall_lru));
972 put_clnt_odstate(dp->dl_clnt_odstate);
973 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
975 if (clp->cl_minorversion == 0)
976 nfs4_put_stid(&dp->dl_stid);
978 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
979 spin_lock(&clp->cl_lock);
980 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
981 spin_unlock(&clp->cl_lock);
989 static unsigned int clientid_hashval(u32 id)
991 return id & CLIENT_HASH_MASK;
994 static unsigned int clientstr_hashval(const char *name)
996 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
1000 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1001 * st_{access,deny}_bmap field of the stateid, in order to track not
1002 * only what share bits are currently in force, but also what
1003 * combinations of share bits previous opens have used. This allows us
1004 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1005 * return an error if the client attempt to downgrade to a combination
1006 * of share bits not explicable by closing some of its previous opens.
1008 * XXX: This enforcement is actually incomplete, since we don't keep
1009 * track of access/deny bit combinations; so, e.g., we allow:
1011 * OPEN allow read, deny write
1012 * OPEN allow both, deny none
1013 * DOWNGRADE allow read, deny none
1015 * which we should reject.
1018 bmap_to_share_mode(unsigned long bmap) {
1020 unsigned int access = 0;
1022 for (i = 1; i < 4; i++) {
1023 if (test_bit(i, &bmap))
1029 /* set share access for a given stateid */
1031 set_access(u32 access, struct nfs4_ol_stateid *stp)
1033 unsigned char mask = 1 << access;
1035 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1036 stp->st_access_bmap |= mask;
1039 /* clear share access for a given stateid */
1041 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1043 unsigned char mask = 1 << access;
1045 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1046 stp->st_access_bmap &= ~mask;
1049 /* test whether a given stateid has access */
1051 test_access(u32 access, struct nfs4_ol_stateid *stp)
1053 unsigned char mask = 1 << access;
1055 return (bool)(stp->st_access_bmap & mask);
1058 /* set share deny for a given stateid */
1060 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1062 unsigned char mask = 1 << deny;
1064 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1065 stp->st_deny_bmap |= mask;
1068 /* clear share deny for a given stateid */
1070 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1072 unsigned char mask = 1 << deny;
1074 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1075 stp->st_deny_bmap &= ~mask;
1078 /* test whether a given stateid is denying specific access */
1080 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1082 unsigned char mask = 1 << deny;
1084 return (bool)(stp->st_deny_bmap & mask);
1087 static int nfs4_access_to_omode(u32 access)
1089 switch (access & NFS4_SHARE_ACCESS_BOTH) {
1090 case NFS4_SHARE_ACCESS_READ:
1092 case NFS4_SHARE_ACCESS_WRITE:
1094 case NFS4_SHARE_ACCESS_BOTH:
1102 * A stateid that had a deny mode associated with it is being released
1103 * or downgraded. Recalculate the deny mode on the file.
1106 recalculate_deny_mode(struct nfs4_file *fp)
1108 struct nfs4_ol_stateid *stp;
1110 spin_lock(&fp->fi_lock);
1111 fp->fi_share_deny = 0;
1112 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1113 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1114 spin_unlock(&fp->fi_lock);
1118 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1121 bool change = false;
1123 for (i = 1; i < 4; i++) {
1124 if ((i & deny) != i) {
1130 /* Recalculate per-file deny mode if there was a change */
1132 recalculate_deny_mode(stp->st_stid.sc_file);
1135 /* release all access and file references for a given stateid */
1137 release_all_access(struct nfs4_ol_stateid *stp)
1140 struct nfs4_file *fp = stp->st_stid.sc_file;
1142 if (fp && stp->st_deny_bmap != 0)
1143 recalculate_deny_mode(fp);
1145 for (i = 1; i < 4; i++) {
1146 if (test_access(i, stp))
1147 nfs4_file_put_access(stp->st_stid.sc_file, i);
1148 clear_access(i, stp);
1152 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1154 kfree(sop->so_owner.data);
1155 sop->so_ops->so_free(sop);
1158 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1160 struct nfs4_client *clp = sop->so_client;
1162 might_lock(&clp->cl_lock);
1164 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1166 sop->so_ops->so_unhash(sop);
1167 spin_unlock(&clp->cl_lock);
1168 nfs4_free_stateowner(sop);
1171 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1173 struct nfs4_file *fp = stp->st_stid.sc_file;
1175 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1177 if (list_empty(&stp->st_perfile))
1180 spin_lock(&fp->fi_lock);
1181 list_del_init(&stp->st_perfile);
1182 spin_unlock(&fp->fi_lock);
1183 list_del(&stp->st_perstateowner);
1187 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1189 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1191 put_clnt_odstate(stp->st_clnt_odstate);
1192 release_all_access(stp);
1193 if (stp->st_stateowner)
1194 nfs4_put_stateowner(stp->st_stateowner);
1195 kmem_cache_free(stateid_slab, stid);
1198 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1200 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1201 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1204 file = find_any_file(stp->st_stid.sc_file);
1206 filp_close(file, (fl_owner_t)lo);
1207 nfs4_free_ol_stateid(stid);
1211 * Put the persistent reference to an already unhashed generic stateid, while
1212 * holding the cl_lock. If it's the last reference, then put it onto the
1213 * reaplist for later destruction.
1215 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1216 struct list_head *reaplist)
1218 struct nfs4_stid *s = &stp->st_stid;
1219 struct nfs4_client *clp = s->sc_client;
1221 lockdep_assert_held(&clp->cl_lock);
1223 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1225 if (!refcount_dec_and_test(&s->sc_count)) {
1226 wake_up_all(&close_wq);
1230 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1231 list_add(&stp->st_locks, reaplist);
1234 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1236 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1238 list_del_init(&stp->st_locks);
1239 nfs4_unhash_stid(&stp->st_stid);
1240 return unhash_ol_stateid(stp);
1243 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1245 struct nfs4_client *clp = stp->st_stid.sc_client;
1248 spin_lock(&clp->cl_lock);
1249 unhashed = unhash_lock_stateid(stp);
1250 spin_unlock(&clp->cl_lock);
1252 nfs4_put_stid(&stp->st_stid);
1255 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1257 struct nfs4_client *clp = lo->lo_owner.so_client;
1259 lockdep_assert_held(&clp->cl_lock);
1261 list_del_init(&lo->lo_owner.so_strhash);
1265 * Free a list of generic stateids that were collected earlier after being
1269 free_ol_stateid_reaplist(struct list_head *reaplist)
1271 struct nfs4_ol_stateid *stp;
1272 struct nfs4_file *fp;
1276 while (!list_empty(reaplist)) {
1277 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1279 list_del(&stp->st_locks);
1280 fp = stp->st_stid.sc_file;
1281 stp->st_stid.sc_free(&stp->st_stid);
1287 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1288 struct list_head *reaplist)
1290 struct nfs4_ol_stateid *stp;
1292 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1294 while (!list_empty(&open_stp->st_locks)) {
1295 stp = list_entry(open_stp->st_locks.next,
1296 struct nfs4_ol_stateid, st_locks);
1297 WARN_ON(!unhash_lock_stateid(stp));
1298 put_ol_stateid_locked(stp, reaplist);
1302 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1303 struct list_head *reaplist)
1307 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1309 unhashed = unhash_ol_stateid(stp);
1310 release_open_stateid_locks(stp, reaplist);
1314 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1316 LIST_HEAD(reaplist);
1318 spin_lock(&stp->st_stid.sc_client->cl_lock);
1319 if (unhash_open_stateid(stp, &reaplist))
1320 put_ol_stateid_locked(stp, &reaplist);
1321 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1322 free_ol_stateid_reaplist(&reaplist);
1325 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1327 struct nfs4_client *clp = oo->oo_owner.so_client;
1329 lockdep_assert_held(&clp->cl_lock);
1331 list_del_init(&oo->oo_owner.so_strhash);
1332 list_del_init(&oo->oo_perclient);
1335 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1337 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1339 struct nfs4_ol_stateid *s;
1341 spin_lock(&nn->client_lock);
1342 s = oo->oo_last_closed_stid;
1344 list_del_init(&oo->oo_close_lru);
1345 oo->oo_last_closed_stid = NULL;
1347 spin_unlock(&nn->client_lock);
1349 nfs4_put_stid(&s->st_stid);
1352 static void release_openowner(struct nfs4_openowner *oo)
1354 struct nfs4_ol_stateid *stp;
1355 struct nfs4_client *clp = oo->oo_owner.so_client;
1356 struct list_head reaplist;
1358 INIT_LIST_HEAD(&reaplist);
1360 spin_lock(&clp->cl_lock);
1361 unhash_openowner_locked(oo);
1362 while (!list_empty(&oo->oo_owner.so_stateids)) {
1363 stp = list_first_entry(&oo->oo_owner.so_stateids,
1364 struct nfs4_ol_stateid, st_perstateowner);
1365 if (unhash_open_stateid(stp, &reaplist))
1366 put_ol_stateid_locked(stp, &reaplist);
1368 spin_unlock(&clp->cl_lock);
1369 free_ol_stateid_reaplist(&reaplist);
1370 release_last_closed_stateid(oo);
1371 nfs4_put_stateowner(&oo->oo_owner);
1375 hash_sessionid(struct nfs4_sessionid *sessionid)
1377 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1379 return sid->sequence % SESSION_HASH_SIZE;
1382 #ifdef CONFIG_SUNRPC_DEBUG
1384 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1386 u32 *ptr = (u32 *)(&sessionid->data[0]);
1387 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1391 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1397 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1398 * won't be used for replay.
1400 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1402 struct nfs4_stateowner *so = cstate->replay_owner;
1404 if (nfserr == nfserr_replay_me)
1407 if (!seqid_mutating_err(ntohl(nfserr))) {
1408 nfsd4_cstate_clear_replay(cstate);
1413 if (so->so_is_open_owner)
1414 release_last_closed_stateid(openowner(so));
1420 gen_sessionid(struct nfsd4_session *ses)
1422 struct nfs4_client *clp = ses->se_client;
1423 struct nfsd4_sessionid *sid;
1425 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1426 sid->clientid = clp->cl_clientid;
1427 sid->sequence = current_sessionid++;
1432 * The protocol defines ca_maxresponssize_cached to include the size of
1433 * the rpc header, but all we need to cache is the data starting after
1434 * the end of the initial SEQUENCE operation--the rest we regenerate
1435 * each time. Therefore we can advertise a ca_maxresponssize_cached
1436 * value that is the number of bytes in our cache plus a few additional
1437 * bytes. In order to stay on the safe side, and not promise more than
1438 * we can cache, those additional bytes must be the minimum possible: 24
1439 * bytes of rpc header (xid through accept state, with AUTH_NULL
1440 * verifier), 12 for the compound header (with zero-length tag), and 44
1441 * for the SEQUENCE op response:
1443 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1446 free_session_slots(struct nfsd4_session *ses)
1450 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1451 free_svc_cred(&ses->se_slots[i]->sl_cred);
1452 kfree(ses->se_slots[i]);
1457 * We don't actually need to cache the rpc and session headers, so we
1458 * can allocate a little less for each slot:
1460 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1464 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1467 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1468 return size + sizeof(struct nfsd4_slot);
1472 * XXX: If we run out of reserved DRC memory we could (up to a point)
1473 * re-negotiate active sessions and reduce their slot usage to make
1474 * room for new connections. For now we just fail the create session.
1476 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1478 u32 slotsize = slot_bytes(ca);
1479 u32 num = ca->maxreqs;
1482 spin_lock(&nfsd_drc_lock);
1483 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1484 nfsd_drc_max_mem - nfsd_drc_mem_used);
1486 * Never use more than a third of the remaining memory,
1487 * unless it's the only way to give this client a slot:
1489 avail = clamp_t(int, avail, slotsize, avail/3);
1490 num = min_t(int, num, avail / slotsize);
1491 nfsd_drc_mem_used += num * slotsize;
1492 spin_unlock(&nfsd_drc_lock);
1497 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1499 int slotsize = slot_bytes(ca);
1501 spin_lock(&nfsd_drc_lock);
1502 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1503 spin_unlock(&nfsd_drc_lock);
1506 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1507 struct nfsd4_channel_attrs *battrs)
1509 int numslots = fattrs->maxreqs;
1510 int slotsize = slot_bytes(fattrs);
1511 struct nfsd4_session *new;
1514 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1515 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1516 mem = numslots * sizeof(struct nfsd4_slot *);
1518 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1521 /* allocate each struct nfsd4_slot and data cache in one piece */
1522 for (i = 0; i < numslots; i++) {
1523 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1524 if (!new->se_slots[i])
1528 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1529 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1534 kfree(new->se_slots[i]);
1539 static void free_conn(struct nfsd4_conn *c)
1541 svc_xprt_put(c->cn_xprt);
1545 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1547 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1548 struct nfs4_client *clp = c->cn_session->se_client;
1550 spin_lock(&clp->cl_lock);
1551 if (!list_empty(&c->cn_persession)) {
1552 list_del(&c->cn_persession);
1555 nfsd4_probe_callback(clp);
1556 spin_unlock(&clp->cl_lock);
1559 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1561 struct nfsd4_conn *conn;
1563 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1566 svc_xprt_get(rqstp->rq_xprt);
1567 conn->cn_xprt = rqstp->rq_xprt;
1568 conn->cn_flags = flags;
1569 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1573 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1575 conn->cn_session = ses;
1576 list_add(&conn->cn_persession, &ses->se_conns);
1579 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1581 struct nfs4_client *clp = ses->se_client;
1583 spin_lock(&clp->cl_lock);
1584 __nfsd4_hash_conn(conn, ses);
1585 spin_unlock(&clp->cl_lock);
1588 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1590 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1591 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1594 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1598 nfsd4_hash_conn(conn, ses);
1599 ret = nfsd4_register_conn(conn);
1601 /* oops; xprt is already down: */
1602 nfsd4_conn_lost(&conn->cn_xpt_user);
1603 /* We may have gained or lost a callback channel: */
1604 nfsd4_probe_callback_sync(ses->se_client);
1607 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1609 u32 dir = NFS4_CDFC4_FORE;
1611 if (cses->flags & SESSION4_BACK_CHAN)
1612 dir |= NFS4_CDFC4_BACK;
1613 return alloc_conn(rqstp, dir);
1616 /* must be called under client_lock */
1617 static void nfsd4_del_conns(struct nfsd4_session *s)
1619 struct nfs4_client *clp = s->se_client;
1620 struct nfsd4_conn *c;
1622 spin_lock(&clp->cl_lock);
1623 while (!list_empty(&s->se_conns)) {
1624 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1625 list_del_init(&c->cn_persession);
1626 spin_unlock(&clp->cl_lock);
1628 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1631 spin_lock(&clp->cl_lock);
1633 spin_unlock(&clp->cl_lock);
1636 static void __free_session(struct nfsd4_session *ses)
1638 free_session_slots(ses);
1642 static void free_session(struct nfsd4_session *ses)
1644 nfsd4_del_conns(ses);
1645 nfsd4_put_drc_mem(&ses->se_fchannel);
1646 __free_session(ses);
1649 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1652 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1654 new->se_client = clp;
1657 INIT_LIST_HEAD(&new->se_conns);
1659 new->se_cb_seq_nr = 1;
1660 new->se_flags = cses->flags;
1661 new->se_cb_prog = cses->callback_prog;
1662 new->se_cb_sec = cses->cb_sec;
1663 atomic_set(&new->se_ref, 0);
1664 idx = hash_sessionid(&new->se_sessionid);
1665 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1666 spin_lock(&clp->cl_lock);
1667 list_add(&new->se_perclnt, &clp->cl_sessions);
1668 spin_unlock(&clp->cl_lock);
1671 struct sockaddr *sa = svc_addr(rqstp);
1673 * This is a little silly; with sessions there's no real
1674 * use for the callback address. Use the peer address
1675 * as a reasonable default for now, but consider fixing
1676 * the rpc client not to require an address in the
1679 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1680 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1684 /* caller must hold client_lock */
1685 static struct nfsd4_session *
1686 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1688 struct nfsd4_session *elem;
1690 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1692 lockdep_assert_held(&nn->client_lock);
1694 dump_sessionid(__func__, sessionid);
1695 idx = hash_sessionid(sessionid);
1696 /* Search in the appropriate list */
1697 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1698 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1699 NFS4_MAX_SESSIONID_LEN)) {
1704 dprintk("%s: session not found\n", __func__);
1708 static struct nfsd4_session *
1709 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1712 struct nfsd4_session *session;
1713 __be32 status = nfserr_badsession;
1715 session = __find_in_sessionid_hashtbl(sessionid, net);
1718 status = nfsd4_get_session_locked(session);
1726 /* caller must hold client_lock */
1728 unhash_session(struct nfsd4_session *ses)
1730 struct nfs4_client *clp = ses->se_client;
1731 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1733 lockdep_assert_held(&nn->client_lock);
1735 list_del(&ses->se_hash);
1736 spin_lock(&ses->se_client->cl_lock);
1737 list_del(&ses->se_perclnt);
1738 spin_unlock(&ses->se_client->cl_lock);
1741 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1743 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1746 * We're assuming the clid was not given out from a boot
1747 * precisely 2^32 (about 136 years) before this one. That seems
1748 * a safe assumption:
1750 if (clid->cl_boot == (u32)nn->boot_time)
1752 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1753 clid->cl_boot, clid->cl_id, nn->boot_time);
1758 * XXX Should we use a slab cache ?
1759 * This type of memory management is somewhat inefficient, but we use it
1760 * anyway since SETCLIENTID is not a common operation.
1762 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1764 struct nfs4_client *clp;
1767 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1770 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1771 if (clp->cl_name.data == NULL)
1773 clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1774 OWNER_HASH_SIZE, GFP_KERNEL);
1775 if (!clp->cl_ownerstr_hashtbl)
1776 goto err_no_hashtbl;
1777 for (i = 0; i < OWNER_HASH_SIZE; i++)
1778 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1779 clp->cl_name.len = name.len;
1780 INIT_LIST_HEAD(&clp->cl_sessions);
1781 idr_init(&clp->cl_stateids);
1782 atomic_set(&clp->cl_refcount, 0);
1783 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1784 INIT_LIST_HEAD(&clp->cl_idhash);
1785 INIT_LIST_HEAD(&clp->cl_openowners);
1786 INIT_LIST_HEAD(&clp->cl_delegations);
1787 INIT_LIST_HEAD(&clp->cl_lru);
1788 INIT_LIST_HEAD(&clp->cl_revoked);
1789 #ifdef CONFIG_NFSD_PNFS
1790 INIT_LIST_HEAD(&clp->cl_lo_states);
1792 spin_lock_init(&clp->cl_lock);
1793 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1796 kfree(clp->cl_name.data);
1803 free_client(struct nfs4_client *clp)
1805 while (!list_empty(&clp->cl_sessions)) {
1806 struct nfsd4_session *ses;
1807 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1809 list_del(&ses->se_perclnt);
1810 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1813 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1814 free_svc_cred(&clp->cl_cred);
1815 kfree(clp->cl_ownerstr_hashtbl);
1816 kfree(clp->cl_name.data);
1817 idr_destroy(&clp->cl_stateids);
1821 /* must be called under the client_lock */
1823 unhash_client_locked(struct nfs4_client *clp)
1825 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1826 struct nfsd4_session *ses;
1828 lockdep_assert_held(&nn->client_lock);
1830 /* Mark the client as expired! */
1832 /* Make it invisible */
1833 if (!list_empty(&clp->cl_idhash)) {
1834 list_del_init(&clp->cl_idhash);
1835 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1836 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1838 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1840 list_del_init(&clp->cl_lru);
1841 spin_lock(&clp->cl_lock);
1842 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1843 list_del_init(&ses->se_hash);
1844 spin_unlock(&clp->cl_lock);
1848 unhash_client(struct nfs4_client *clp)
1850 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1852 spin_lock(&nn->client_lock);
1853 unhash_client_locked(clp);
1854 spin_unlock(&nn->client_lock);
1857 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1859 if (atomic_read(&clp->cl_refcount))
1860 return nfserr_jukebox;
1861 unhash_client_locked(clp);
1866 __destroy_client(struct nfs4_client *clp)
1868 struct nfs4_openowner *oo;
1869 struct nfs4_delegation *dp;
1870 struct list_head reaplist;
1872 INIT_LIST_HEAD(&reaplist);
1873 spin_lock(&state_lock);
1874 while (!list_empty(&clp->cl_delegations)) {
1875 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1876 WARN_ON(!unhash_delegation_locked(dp));
1877 list_add(&dp->dl_recall_lru, &reaplist);
1879 spin_unlock(&state_lock);
1880 while (!list_empty(&reaplist)) {
1881 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1882 list_del_init(&dp->dl_recall_lru);
1883 put_clnt_odstate(dp->dl_clnt_odstate);
1884 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
1885 nfs4_put_stid(&dp->dl_stid);
1887 while (!list_empty(&clp->cl_revoked)) {
1888 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1889 list_del_init(&dp->dl_recall_lru);
1890 nfs4_put_stid(&dp->dl_stid);
1892 while (!list_empty(&clp->cl_openowners)) {
1893 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1894 nfs4_get_stateowner(&oo->oo_owner);
1895 release_openowner(oo);
1897 nfsd4_return_all_client_layouts(clp);
1898 nfsd4_shutdown_callback(clp);
1899 if (clp->cl_cb_conn.cb_xprt)
1900 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1905 destroy_client(struct nfs4_client *clp)
1908 __destroy_client(clp);
1911 static void expire_client(struct nfs4_client *clp)
1914 nfsd4_client_record_remove(clp);
1915 __destroy_client(clp);
1918 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1920 memcpy(target->cl_verifier.data, source->data,
1921 sizeof(target->cl_verifier.data));
1924 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1926 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1927 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1930 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1932 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
1933 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
1935 if ((source->cr_principal && ! target->cr_principal) ||
1936 (source->cr_raw_principal && ! target->cr_raw_principal))
1939 target->cr_flavor = source->cr_flavor;
1940 target->cr_uid = source->cr_uid;
1941 target->cr_gid = source->cr_gid;
1942 target->cr_group_info = source->cr_group_info;
1943 get_group_info(target->cr_group_info);
1944 target->cr_gss_mech = source->cr_gss_mech;
1945 if (source->cr_gss_mech)
1946 gss_mech_get(source->cr_gss_mech);
1951 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1953 if (o1->len < o2->len)
1955 if (o1->len > o2->len)
1957 return memcmp(o1->data, o2->data, o1->len);
1960 static int same_name(const char *n1, const char *n2)
1962 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1966 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1968 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1972 same_clid(clientid_t *cl1, clientid_t *cl2)
1974 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1977 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1981 if (g1->ngroups != g2->ngroups)
1983 for (i=0; i<g1->ngroups; i++)
1984 if (!gid_eq(g1->gid[i], g2->gid[i]))
1990 * RFC 3530 language requires clid_inuse be returned when the
1991 * "principal" associated with a requests differs from that previously
1992 * used. We use uid, gid's, and gss principal string as our best
1993 * approximation. We also don't want to allow non-gss use of a client
1994 * established using gss: in theory cr_principal should catch that
1995 * change, but in practice cr_principal can be null even in the gss case
1996 * since gssd doesn't always pass down a principal string.
1998 static bool is_gss_cred(struct svc_cred *cr)
2000 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2001 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2006 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2008 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2009 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2010 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2011 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2013 if (cr1->cr_principal == cr2->cr_principal)
2015 if (!cr1->cr_principal || !cr2->cr_principal)
2017 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2020 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2022 struct svc_cred *cr = &rqstp->rq_cred;
2025 if (!cr->cr_gss_mech)
2027 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2028 return service == RPC_GSS_SVC_INTEGRITY ||
2029 service == RPC_GSS_SVC_PRIVACY;
2032 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2034 struct svc_cred *cr = &rqstp->rq_cred;
2036 if (!cl->cl_mach_cred)
2038 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2040 if (!svc_rqst_integrity_protected(rqstp))
2042 if (cl->cl_cred.cr_raw_principal)
2043 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2044 cr->cr_raw_principal);
2045 if (!cr->cr_principal)
2047 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2050 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2055 * This is opaque to client, so no need to byte-swap. Use
2056 * __force to keep sparse happy
2058 verf[0] = (__force __be32)get_seconds();
2059 verf[1] = (__force __be32)nn->clverifier_counter++;
2060 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2063 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2065 clp->cl_clientid.cl_boot = nn->boot_time;
2066 clp->cl_clientid.cl_id = nn->clientid_counter++;
2067 gen_confirm(clp, nn);
2070 static struct nfs4_stid *
2071 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2073 struct nfs4_stid *ret;
2075 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2076 if (!ret || !ret->sc_type)
2081 static struct nfs4_stid *
2082 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2084 struct nfs4_stid *s;
2086 spin_lock(&cl->cl_lock);
2087 s = find_stateid_locked(cl, t);
2089 if (typemask & s->sc_type)
2090 refcount_inc(&s->sc_count);
2094 spin_unlock(&cl->cl_lock);
2098 static struct nfs4_client *create_client(struct xdr_netobj name,
2099 struct svc_rqst *rqstp, nfs4_verifier *verf)
2101 struct nfs4_client *clp;
2102 struct sockaddr *sa = svc_addr(rqstp);
2104 struct net *net = SVC_NET(rqstp);
2106 clp = alloc_client(name);
2110 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2115 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2116 clp->cl_time = get_seconds();
2117 clear_bit(0, &clp->cl_cb_slot_busy);
2118 copy_verf(clp, verf);
2119 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2120 clp->cl_cb_session = NULL;
2126 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2128 struct rb_node **new = &(root->rb_node), *parent = NULL;
2129 struct nfs4_client *clp;
2132 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2135 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2136 new = &((*new)->rb_left);
2138 new = &((*new)->rb_right);
2141 rb_link_node(&new_clp->cl_namenode, parent, new);
2142 rb_insert_color(&new_clp->cl_namenode, root);
2145 static struct nfs4_client *
2146 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2149 struct rb_node *node = root->rb_node;
2150 struct nfs4_client *clp;
2153 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2154 cmp = compare_blob(&clp->cl_name, name);
2156 node = node->rb_left;
2158 node = node->rb_right;
2166 add_to_unconfirmed(struct nfs4_client *clp)
2168 unsigned int idhashval;
2169 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2171 lockdep_assert_held(&nn->client_lock);
2173 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2174 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2175 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2176 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2177 renew_client_locked(clp);
2181 move_to_confirmed(struct nfs4_client *clp)
2183 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2184 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2186 lockdep_assert_held(&nn->client_lock);
2188 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2189 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2190 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2191 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2192 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2193 renew_client_locked(clp);
2196 static struct nfs4_client *
2197 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2199 struct nfs4_client *clp;
2200 unsigned int idhashval = clientid_hashval(clid->cl_id);
2202 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2203 if (same_clid(&clp->cl_clientid, clid)) {
2204 if ((bool)clp->cl_minorversion != sessions)
2206 renew_client_locked(clp);
2213 static struct nfs4_client *
2214 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2216 struct list_head *tbl = nn->conf_id_hashtbl;
2218 lockdep_assert_held(&nn->client_lock);
2219 return find_client_in_id_table(tbl, clid, sessions);
2222 static struct nfs4_client *
2223 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2225 struct list_head *tbl = nn->unconf_id_hashtbl;
2227 lockdep_assert_held(&nn->client_lock);
2228 return find_client_in_id_table(tbl, clid, sessions);
2231 static bool clp_used_exchangeid(struct nfs4_client *clp)
2233 return clp->cl_exchange_flags != 0;
2236 static struct nfs4_client *
2237 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2239 lockdep_assert_held(&nn->client_lock);
2240 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2243 static struct nfs4_client *
2244 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2246 lockdep_assert_held(&nn->client_lock);
2247 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2251 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2253 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2254 struct sockaddr *sa = svc_addr(rqstp);
2255 u32 scopeid = rpc_get_scope_id(sa);
2256 unsigned short expected_family;
2258 /* Currently, we only support tcp and tcp6 for the callback channel */
2259 if (se->se_callback_netid_len == 3 &&
2260 !memcmp(se->se_callback_netid_val, "tcp", 3))
2261 expected_family = AF_INET;
2262 else if (se->se_callback_netid_len == 4 &&
2263 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2264 expected_family = AF_INET6;
2268 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2269 se->se_callback_addr_len,
2270 (struct sockaddr *)&conn->cb_addr,
2271 sizeof(conn->cb_addr));
2273 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2276 if (conn->cb_addr.ss_family == AF_INET6)
2277 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2279 conn->cb_prog = se->se_callback_prog;
2280 conn->cb_ident = se->se_callback_ident;
2281 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2284 conn->cb_addr.ss_family = AF_UNSPEC;
2285 conn->cb_addrlen = 0;
2286 dprintk("NFSD: this client (clientid %08x/%08x) "
2287 "will not receive delegations\n",
2288 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2294 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2297 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2299 struct xdr_buf *buf = resp->xdr.buf;
2300 struct nfsd4_slot *slot = resp->cstate.slot;
2303 dprintk("--> %s slot %p\n", __func__, slot);
2305 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2306 slot->sl_opcnt = resp->opcnt;
2307 slot->sl_status = resp->cstate.status;
2308 free_svc_cred(&slot->sl_cred);
2309 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2311 if (!nfsd4_cache_this(resp)) {
2312 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2315 slot->sl_flags |= NFSD4_SLOT_CACHED;
2317 base = resp->cstate.data_offset;
2318 slot->sl_datalen = buf->len - base;
2319 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2320 WARN(1, "%s: sessions DRC could not cache compound\n",
2326 * Encode the replay sequence operation from the slot values.
2327 * If cachethis is FALSE encode the uncached rep error on the next
2328 * operation which sets resp->p and increments resp->opcnt for
2329 * nfs4svc_encode_compoundres.
2333 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2334 struct nfsd4_compoundres *resp)
2336 struct nfsd4_op *op;
2337 struct nfsd4_slot *slot = resp->cstate.slot;
2339 /* Encode the replayed sequence operation */
2340 op = &args->ops[resp->opcnt - 1];
2341 nfsd4_encode_operation(resp, op);
2343 if (slot->sl_flags & NFSD4_SLOT_CACHED)
2345 if (args->opcnt == 1) {
2347 * The original operation wasn't a solo sequence--we
2348 * always cache those--so this retry must not match the
2351 op->status = nfserr_seq_false_retry;
2353 op = &args->ops[resp->opcnt++];
2354 op->status = nfserr_retry_uncached_rep;
2355 nfsd4_encode_operation(resp, op);
2361 * The sequence operation is not cached because we can use the slot and
2365 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2366 struct nfsd4_sequence *seq)
2368 struct nfsd4_slot *slot = resp->cstate.slot;
2369 struct xdr_stream *xdr = &resp->xdr;
2373 dprintk("--> %s slot %p\n", __func__, slot);
2375 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2379 p = xdr_reserve_space(xdr, slot->sl_datalen);
2382 return nfserr_serverfault;
2384 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2385 xdr_commit_encode(xdr);
2387 resp->opcnt = slot->sl_opcnt;
2388 return slot->sl_status;
2392 * Set the exchange_id flags returned by the server.
2395 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2397 #ifdef CONFIG_NFSD_PNFS
2398 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2400 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2403 /* Referrals are supported, Migration is not. */
2404 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2406 /* set the wire flags to return to client. */
2407 clid->flags = new->cl_exchange_flags;
2410 static bool client_has_openowners(struct nfs4_client *clp)
2412 struct nfs4_openowner *oo;
2414 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2415 if (!list_empty(&oo->oo_owner.so_stateids))
2421 static bool client_has_state(struct nfs4_client *clp)
2423 return client_has_openowners(clp)
2424 #ifdef CONFIG_NFSD_PNFS
2425 || !list_empty(&clp->cl_lo_states)
2427 || !list_empty(&clp->cl_delegations)
2428 || !list_empty(&clp->cl_sessions);
2432 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2433 union nfsd4_op_u *u)
2435 struct nfsd4_exchange_id *exid = &u->exchange_id;
2436 struct nfs4_client *conf, *new;
2437 struct nfs4_client *unconf = NULL;
2439 char addr_str[INET6_ADDRSTRLEN];
2440 nfs4_verifier verf = exid->verifier;
2441 struct sockaddr *sa = svc_addr(rqstp);
2442 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2443 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2445 rpc_ntop(sa, addr_str, sizeof(addr_str));
2446 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2447 "ip_addr=%s flags %x, spa_how %d\n",
2448 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2449 addr_str, exid->flags, exid->spa_how);
2451 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2452 return nfserr_inval;
2454 new = create_client(exid->clname, rqstp, &verf);
2456 return nfserr_jukebox;
2458 switch (exid->spa_how) {
2460 exid->spo_must_enforce[0] = 0;
2461 exid->spo_must_enforce[1] = (
2462 1 << (OP_BIND_CONN_TO_SESSION - 32) |
2463 1 << (OP_EXCHANGE_ID - 32) |
2464 1 << (OP_CREATE_SESSION - 32) |
2465 1 << (OP_DESTROY_SESSION - 32) |
2466 1 << (OP_DESTROY_CLIENTID - 32));
2468 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2469 1 << (OP_OPEN_DOWNGRADE) |
2471 1 << (OP_DELEGRETURN));
2473 exid->spo_must_allow[1] &= (
2474 1 << (OP_TEST_STATEID - 32) |
2475 1 << (OP_FREE_STATEID - 32));
2476 if (!svc_rqst_integrity_protected(rqstp)) {
2477 status = nfserr_inval;
2481 * Sometimes userspace doesn't give us a principal.
2482 * Which is a bug, really. Anyway, we can't enforce
2483 * MACH_CRED in that case, better to give up now:
2485 if (!new->cl_cred.cr_principal &&
2486 !new->cl_cred.cr_raw_principal) {
2487 status = nfserr_serverfault;
2490 new->cl_mach_cred = true;
2493 default: /* checked by xdr code */
2496 status = nfserr_encr_alg_unsupp;
2500 /* Cases below refer to rfc 5661 section 18.35.4: */
2501 spin_lock(&nn->client_lock);
2502 conf = find_confirmed_client_by_name(&exid->clname, nn);
2504 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2505 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2508 if (!clp_used_exchangeid(conf)) { /* buggy client */
2509 status = nfserr_inval;
2512 if (!nfsd4_mach_creds_match(conf, rqstp)) {
2513 status = nfserr_wrong_cred;
2516 if (!creds_match) { /* case 9 */
2517 status = nfserr_perm;
2520 if (!verfs_match) { /* case 8 */
2521 status = nfserr_not_same;
2525 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2528 if (!creds_match) { /* case 3 */
2529 if (client_has_state(conf)) {
2530 status = nfserr_clid_inuse;
2535 if (verfs_match) { /* case 2 */
2536 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2539 /* case 5, client reboot */
2544 if (update) { /* case 7 */
2545 status = nfserr_noent;
2549 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
2550 if (unconf) /* case 4, possible retry or client restart */
2551 unhash_client_locked(unconf);
2553 /* case 1 (normal case) */
2556 status = mark_client_expired_locked(conf);
2560 new->cl_minorversion = cstate->minorversion;
2561 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
2562 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
2565 add_to_unconfirmed(new);
2568 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2569 exid->clientid.cl_id = conf->cl_clientid.cl_id;
2571 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2572 nfsd4_set_ex_flags(conf, exid);
2574 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2575 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2579 spin_unlock(&nn->client_lock);
2584 expire_client(unconf);
2589 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2591 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2594 /* The slot is in use, and no response has been sent. */
2596 if (seqid == slot_seqid)
2597 return nfserr_jukebox;
2599 return nfserr_seq_misordered;
2601 /* Note unsigned 32-bit arithmetic handles wraparound: */
2602 if (likely(seqid == slot_seqid + 1))
2604 if (seqid == slot_seqid)
2605 return nfserr_replay_cache;
2606 return nfserr_seq_misordered;
2610 * Cache the create session result into the create session single DRC
2611 * slot cache by saving the xdr structure. sl_seqid has been set.
2612 * Do this for solo or embedded create session operations.
2615 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2616 struct nfsd4_clid_slot *slot, __be32 nfserr)
2618 slot->sl_status = nfserr;
2619 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2623 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2624 struct nfsd4_clid_slot *slot)
2626 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2627 return slot->sl_status;
2630 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2631 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2632 1 + /* MIN tag is length with zero, only length */ \
2633 3 + /* version, opcount, opcode */ \
2634 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2635 /* seqid, slotID, slotID, cache */ \
2636 4 ) * sizeof(__be32))
2638 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2639 2 + /* verifier: AUTH_NULL, length 0 */\
2641 1 + /* MIN tag is length with zero, only length */ \
2642 3 + /* opcount, opcode, opstatus*/ \
2643 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2644 /* seqid, slotID, slotID, slotID, status */ \
2645 5 ) * sizeof(__be32))
2647 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2649 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2651 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2652 return nfserr_toosmall;
2653 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2654 return nfserr_toosmall;
2655 ca->headerpadsz = 0;
2656 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2657 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2658 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2659 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2660 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2661 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2663 * Note decreasing slot size below client's request may make it
2664 * difficult for client to function correctly, whereas
2665 * decreasing the number of slots will (just?) affect
2666 * performance. When short on memory we therefore prefer to
2667 * decrease number of slots instead of their size. Clients that
2668 * request larger slots than they need will get poor results:
2670 ca->maxreqs = nfsd4_get_drc_mem(ca);
2672 return nfserr_jukebox;
2678 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2679 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2681 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2682 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2684 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2685 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2687 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2688 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2689 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2690 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2693 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2695 ca->headerpadsz = 0;
2697 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2698 return nfserr_toosmall;
2699 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2700 return nfserr_toosmall;
2701 ca->maxresp_cached = 0;
2703 return nfserr_toosmall;
2708 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2710 switch (cbs->flavor) {
2716 * GSS case: the spec doesn't allow us to return this
2717 * error. But it also doesn't allow us not to support
2719 * I'd rather this fail hard than return some error the
2720 * client might think it can already handle:
2722 return nfserr_encr_alg_unsupp;
2727 nfsd4_create_session(struct svc_rqst *rqstp,
2728 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2730 struct nfsd4_create_session *cr_ses = &u->create_session;
2731 struct sockaddr *sa = svc_addr(rqstp);
2732 struct nfs4_client *conf, *unconf;
2733 struct nfs4_client *old = NULL;
2734 struct nfsd4_session *new;
2735 struct nfsd4_conn *conn;
2736 struct nfsd4_clid_slot *cs_slot = NULL;
2738 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2740 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2741 return nfserr_inval;
2742 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2745 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2748 status = check_backchannel_attrs(&cr_ses->back_channel);
2750 goto out_release_drc_mem;
2751 status = nfserr_jukebox;
2752 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2754 goto out_release_drc_mem;
2755 conn = alloc_conn_from_crses(rqstp, cr_ses);
2757 goto out_free_session;
2759 spin_lock(&nn->client_lock);
2760 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2761 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2762 WARN_ON_ONCE(conf && unconf);
2765 status = nfserr_wrong_cred;
2766 if (!nfsd4_mach_creds_match(conf, rqstp))
2768 cs_slot = &conf->cl_cs_slot;
2769 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2771 if (status == nfserr_replay_cache)
2772 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2775 } else if (unconf) {
2776 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2777 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2778 status = nfserr_clid_inuse;
2781 status = nfserr_wrong_cred;
2782 if (!nfsd4_mach_creds_match(unconf, rqstp))
2784 cs_slot = &unconf->cl_cs_slot;
2785 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2787 /* an unconfirmed replay returns misordered */
2788 status = nfserr_seq_misordered;
2791 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2793 status = mark_client_expired_locked(old);
2799 move_to_confirmed(unconf);
2802 status = nfserr_stale_clientid;
2806 /* Persistent sessions are not supported */
2807 cr_ses->flags &= ~SESSION4_PERSIST;
2808 /* Upshifting from TCP to RDMA is not supported */
2809 cr_ses->flags &= ~SESSION4_RDMA;
2811 init_session(rqstp, new, conf, cr_ses);
2812 nfsd4_get_session_locked(new);
2814 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2815 NFS4_MAX_SESSIONID_LEN);
2816 cs_slot->sl_seqid++;
2817 cr_ses->seqid = cs_slot->sl_seqid;
2819 /* cache solo and embedded create sessions under the client_lock */
2820 nfsd4_cache_create_session(cr_ses, cs_slot, status);
2821 spin_unlock(&nn->client_lock);
2822 /* init connection and backchannel */
2823 nfsd4_init_conn(rqstp, conn, new);
2824 nfsd4_put_session(new);
2829 spin_unlock(&nn->client_lock);
2834 __free_session(new);
2835 out_release_drc_mem:
2836 nfsd4_put_drc_mem(&cr_ses->fore_channel);
2840 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2843 case NFS4_CDFC4_FORE:
2844 case NFS4_CDFC4_BACK:
2846 case NFS4_CDFC4_FORE_OR_BOTH:
2847 case NFS4_CDFC4_BACK_OR_BOTH:
2848 *dir = NFS4_CDFC4_BOTH;
2851 return nfserr_inval;
2854 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
2855 struct nfsd4_compound_state *cstate,
2856 union nfsd4_op_u *u)
2858 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
2859 struct nfsd4_session *session = cstate->session;
2860 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2863 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2866 spin_lock(&nn->client_lock);
2867 session->se_cb_prog = bc->bc_cb_program;
2868 session->se_cb_sec = bc->bc_cb_sec;
2869 spin_unlock(&nn->client_lock);
2871 nfsd4_probe_callback(session->se_client);
2876 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2877 struct nfsd4_compound_state *cstate,
2878 union nfsd4_op_u *u)
2880 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
2882 struct nfsd4_conn *conn;
2883 struct nfsd4_session *session;
2884 struct net *net = SVC_NET(rqstp);
2885 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2887 if (!nfsd4_last_compound_op(rqstp))
2888 return nfserr_not_only_op;
2889 spin_lock(&nn->client_lock);
2890 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2891 spin_unlock(&nn->client_lock);
2893 goto out_no_session;
2894 status = nfserr_wrong_cred;
2895 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
2897 status = nfsd4_map_bcts_dir(&bcts->dir);
2900 conn = alloc_conn(rqstp, bcts->dir);
2901 status = nfserr_jukebox;
2904 nfsd4_init_conn(rqstp, conn, session);
2907 nfsd4_put_session(session);
2912 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2916 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2920 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
2921 union nfsd4_op_u *u)
2923 struct nfsd4_destroy_session *sessionid = &u->destroy_session;
2924 struct nfsd4_session *ses;
2926 int ref_held_by_me = 0;
2927 struct net *net = SVC_NET(r);
2928 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2930 status = nfserr_not_only_op;
2931 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2932 if (!nfsd4_last_compound_op(r))
2936 dump_sessionid(__func__, &sessionid->sessionid);
2937 spin_lock(&nn->client_lock);
2938 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2940 goto out_client_lock;
2941 status = nfserr_wrong_cred;
2942 if (!nfsd4_mach_creds_match(ses->se_client, r))
2943 goto out_put_session;
2944 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2946 goto out_put_session;
2947 unhash_session(ses);
2948 spin_unlock(&nn->client_lock);
2950 nfsd4_probe_callback_sync(ses->se_client);
2952 spin_lock(&nn->client_lock);
2955 nfsd4_put_session_locked(ses);
2957 spin_unlock(&nn->client_lock);
2962 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2964 struct nfsd4_conn *c;
2966 list_for_each_entry(c, &s->se_conns, cn_persession) {
2967 if (c->cn_xprt == xpt) {
2974 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2976 struct nfs4_client *clp = ses->se_client;
2977 struct nfsd4_conn *c;
2978 __be32 status = nfs_ok;
2981 spin_lock(&clp->cl_lock);
2982 c = __nfsd4_find_conn(new->cn_xprt, ses);
2985 status = nfserr_conn_not_bound_to_session;
2986 if (clp->cl_mach_cred)
2988 __nfsd4_hash_conn(new, ses);
2989 spin_unlock(&clp->cl_lock);
2990 ret = nfsd4_register_conn(new);
2992 /* oops; xprt is already down: */
2993 nfsd4_conn_lost(&new->cn_xpt_user);
2996 spin_unlock(&clp->cl_lock);
3001 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3003 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3005 return args->opcnt > session->se_fchannel.maxops;
3008 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3009 struct nfsd4_session *session)
3011 struct xdr_buf *xb = &rqstp->rq_arg;
3013 return xb->len > session->se_fchannel.maxreq_sz;
3016 static bool replay_matches_cache(struct svc_rqst *rqstp,
3017 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3019 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3021 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3022 (bool)seq->cachethis)
3025 * If there's an error than the reply can have fewer ops than
3026 * the call. But if we cached a reply with *more* ops than the
3027 * call you're sending us now, then this new call is clearly not
3028 * really a replay of the old one:
3030 if (slot->sl_opcnt < argp->opcnt)
3032 /* This is the only check explicitly called by spec: */
3033 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3036 * There may be more comparisons we could actually do, but the
3037 * spec doesn't require us to catch every case where the calls
3038 * don't match (that would require caching the call as well as
3039 * the reply), so we don't bother.
3045 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3046 union nfsd4_op_u *u)
3048 struct nfsd4_sequence *seq = &u->sequence;
3049 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3050 struct xdr_stream *xdr = &resp->xdr;
3051 struct nfsd4_session *session;
3052 struct nfs4_client *clp;
3053 struct nfsd4_slot *slot;
3054 struct nfsd4_conn *conn;
3057 struct net *net = SVC_NET(rqstp);
3058 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3060 if (resp->opcnt != 1)
3061 return nfserr_sequence_pos;
3064 * Will be either used or freed by nfsd4_sequence_check_conn
3067 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3069 return nfserr_jukebox;
3071 spin_lock(&nn->client_lock);
3072 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3074 goto out_no_session;
3075 clp = session->se_client;
3077 status = nfserr_too_many_ops;
3078 if (nfsd4_session_too_many_ops(rqstp, session))
3079 goto out_put_session;
3081 status = nfserr_req_too_big;
3082 if (nfsd4_request_too_big(rqstp, session))
3083 goto out_put_session;
3085 status = nfserr_badslot;
3086 if (seq->slotid >= session->se_fchannel.maxreqs)
3087 goto out_put_session;
3089 slot = session->se_slots[seq->slotid];
3090 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3092 /* We do not negotiate the number of slots yet, so set the
3093 * maxslots to the session maxreqs which is used to encode
3094 * sr_highest_slotid and the sr_target_slot id to maxslots */
3095 seq->maxslots = session->se_fchannel.maxreqs;
3097 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3098 slot->sl_flags & NFSD4_SLOT_INUSE);
3099 if (status == nfserr_replay_cache) {
3100 status = nfserr_seq_misordered;
3101 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3102 goto out_put_session;
3103 status = nfserr_seq_false_retry;
3104 if (!replay_matches_cache(rqstp, seq, slot))
3105 goto out_put_session;
3106 cstate->slot = slot;
3107 cstate->session = session;
3109 /* Return the cached reply status and set cstate->status
3110 * for nfsd4_proc_compound processing */
3111 status = nfsd4_replay_cache_entry(resp, seq);
3112 cstate->status = nfserr_replay_cache;
3116 goto out_put_session;
3118 status = nfsd4_sequence_check_conn(conn, session);
3121 goto out_put_session;
3123 buflen = (seq->cachethis) ?
3124 session->se_fchannel.maxresp_cached :
3125 session->se_fchannel.maxresp_sz;
3126 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3128 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3129 goto out_put_session;
3130 svc_reserve(rqstp, buflen);
3133 /* Success! bump slot seqid */
3134 slot->sl_seqid = seq->seqid;
3135 slot->sl_flags |= NFSD4_SLOT_INUSE;
3137 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3139 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3141 cstate->slot = slot;
3142 cstate->session = session;
3146 switch (clp->cl_cb_state) {
3148 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3150 case NFSD4_CB_FAULT:
3151 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3154 seq->status_flags = 0;
3156 if (!list_empty(&clp->cl_revoked))
3157 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3161 spin_unlock(&nn->client_lock);
3164 nfsd4_put_session_locked(session);
3165 goto out_no_session;
3169 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3171 struct nfsd4_compound_state *cs = &resp->cstate;
3173 if (nfsd4_has_session(cs)) {
3174 if (cs->status != nfserr_replay_cache) {
3175 nfsd4_store_cache_entry(resp);
3176 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3178 /* Drop session reference that was taken in nfsd4_sequence() */
3179 nfsd4_put_session(cs->session);
3181 put_client_renew(cs->clp);
3185 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3186 struct nfsd4_compound_state *cstate,
3187 union nfsd4_op_u *u)
3189 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3190 struct nfs4_client *conf, *unconf;
3191 struct nfs4_client *clp = NULL;
3193 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3195 spin_lock(&nn->client_lock);
3196 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3197 conf = find_confirmed_client(&dc->clientid, true, nn);
3198 WARN_ON_ONCE(conf && unconf);
3201 if (client_has_state(conf)) {
3202 status = nfserr_clientid_busy;
3205 status = mark_client_expired_locked(conf);
3212 status = nfserr_stale_clientid;
3215 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3217 status = nfserr_wrong_cred;
3220 unhash_client_locked(clp);
3222 spin_unlock(&nn->client_lock);
3229 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3230 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3232 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3235 if (rc->rca_one_fs) {
3236 if (!cstate->current_fh.fh_dentry)
3237 return nfserr_nofilehandle;
3239 * We don't take advantage of the rca_one_fs case.
3240 * That's OK, it's optional, we can safely ignore it.
3245 status = nfserr_complete_already;
3246 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3247 &cstate->session->se_client->cl_flags))
3250 status = nfserr_stale_clientid;
3251 if (is_client_expired(cstate->session->se_client))
3253 * The following error isn't really legal.
3254 * But we only get here if the client just explicitly
3255 * destroyed the client. Surely it no longer cares what
3256 * error it gets back on an operation for the dead
3262 nfsd4_client_record_create(cstate->session->se_client);
3268 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3269 union nfsd4_op_u *u)
3271 struct nfsd4_setclientid *setclid = &u->setclientid;
3272 struct xdr_netobj clname = setclid->se_name;
3273 nfs4_verifier clverifier = setclid->se_verf;
3274 struct nfs4_client *conf, *new;
3275 struct nfs4_client *unconf = NULL;
3277 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3279 new = create_client(clname, rqstp, &clverifier);
3281 return nfserr_jukebox;
3282 /* Cases below refer to rfc 3530 section 14.2.33: */
3283 spin_lock(&nn->client_lock);
3284 conf = find_confirmed_client_by_name(&clname, nn);
3285 if (conf && client_has_state(conf)) {
3287 status = nfserr_clid_inuse;
3288 if (clp_used_exchangeid(conf))
3290 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3291 char addr_str[INET6_ADDRSTRLEN];
3292 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3294 dprintk("NFSD: setclientid: string in use by client "
3295 "at %s\n", addr_str);
3299 unconf = find_unconfirmed_client_by_name(&clname, nn);
3301 unhash_client_locked(unconf);
3302 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3303 /* case 1: probable callback update */
3304 copy_clid(new, conf);
3305 gen_confirm(new, nn);
3306 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3308 new->cl_minorversion = 0;
3309 gen_callback(new, setclid, rqstp);
3310 add_to_unconfirmed(new);
3311 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3312 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3313 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3317 spin_unlock(&nn->client_lock);
3321 expire_client(unconf);
3327 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3328 struct nfsd4_compound_state *cstate,
3329 union nfsd4_op_u *u)
3331 struct nfsd4_setclientid_confirm *setclientid_confirm =
3332 &u->setclientid_confirm;
3333 struct nfs4_client *conf, *unconf;
3334 struct nfs4_client *old = NULL;
3335 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3336 clientid_t * clid = &setclientid_confirm->sc_clientid;
3338 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3340 if (STALE_CLIENTID(clid, nn))
3341 return nfserr_stale_clientid;
3343 spin_lock(&nn->client_lock);
3344 conf = find_confirmed_client(clid, false, nn);
3345 unconf = find_unconfirmed_client(clid, false, nn);
3347 * We try hard to give out unique clientid's, so if we get an
3348 * attempt to confirm the same clientid with a different cred,
3349 * the client may be buggy; this should never happen.
3351 * Nevertheless, RFC 7530 recommends INUSE for this case:
3353 status = nfserr_clid_inuse;
3354 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3356 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3358 /* cases below refer to rfc 3530 section 14.2.34: */
3359 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3360 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3361 /* case 2: probable retransmit */
3363 } else /* case 4: client hasn't noticed we rebooted yet? */
3364 status = nfserr_stale_clientid;
3368 if (conf) { /* case 1: callback update */
3370 unhash_client_locked(old);
3371 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3372 } else { /* case 3: normal case; new or rebooted client */
3373 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3375 status = nfserr_clid_inuse;
3376 if (client_has_state(old)
3377 && !same_creds(&unconf->cl_cred,
3380 status = mark_client_expired_locked(old);
3386 move_to_confirmed(unconf);
3389 get_client_locked(conf);
3390 spin_unlock(&nn->client_lock);
3391 nfsd4_probe_callback(conf);
3392 spin_lock(&nn->client_lock);
3393 put_client_renew_locked(conf);
3395 spin_unlock(&nn->client_lock);
3401 static struct nfs4_file *nfsd4_alloc_file(void)
3403 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3406 /* OPEN Share state helper functions */
3407 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3408 struct nfs4_file *fp)
3410 lockdep_assert_held(&state_lock);
3412 refcount_set(&fp->fi_ref, 1);
3413 spin_lock_init(&fp->fi_lock);
3414 INIT_LIST_HEAD(&fp->fi_stateids);
3415 INIT_LIST_HEAD(&fp->fi_delegations);
3416 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3417 fh_copy_shallow(&fp->fi_fhandle, fh);
3418 fp->fi_deleg_file = NULL;
3419 fp->fi_had_conflict = false;
3420 fp->fi_share_deny = 0;
3421 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3422 memset(fp->fi_access, 0, sizeof(fp->fi_access));
3423 #ifdef CONFIG_NFSD_PNFS
3424 INIT_LIST_HEAD(&fp->fi_lo_states);
3425 atomic_set(&fp->fi_lo_recalls, 0);
3427 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3431 nfsd4_free_slabs(void)
3433 kmem_cache_destroy(odstate_slab);
3434 kmem_cache_destroy(openowner_slab);
3435 kmem_cache_destroy(lockowner_slab);
3436 kmem_cache_destroy(file_slab);
3437 kmem_cache_destroy(stateid_slab);
3438 kmem_cache_destroy(deleg_slab);
3442 nfsd4_init_slabs(void)
3444 openowner_slab = kmem_cache_create("nfsd4_openowners",
3445 sizeof(struct nfs4_openowner), 0, 0, NULL);
3446 if (openowner_slab == NULL)
3448 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3449 sizeof(struct nfs4_lockowner), 0, 0, NULL);
3450 if (lockowner_slab == NULL)
3451 goto out_free_openowner_slab;
3452 file_slab = kmem_cache_create("nfsd4_files",
3453 sizeof(struct nfs4_file), 0, 0, NULL);
3454 if (file_slab == NULL)
3455 goto out_free_lockowner_slab;
3456 stateid_slab = kmem_cache_create("nfsd4_stateids",
3457 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3458 if (stateid_slab == NULL)
3459 goto out_free_file_slab;
3460 deleg_slab = kmem_cache_create("nfsd4_delegations",
3461 sizeof(struct nfs4_delegation), 0, 0, NULL);
3462 if (deleg_slab == NULL)
3463 goto out_free_stateid_slab;
3464 odstate_slab = kmem_cache_create("nfsd4_odstate",
3465 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3466 if (odstate_slab == NULL)
3467 goto out_free_deleg_slab;
3470 out_free_deleg_slab:
3471 kmem_cache_destroy(deleg_slab);
3472 out_free_stateid_slab:
3473 kmem_cache_destroy(stateid_slab);
3475 kmem_cache_destroy(file_slab);
3476 out_free_lockowner_slab:
3477 kmem_cache_destroy(lockowner_slab);
3478 out_free_openowner_slab:
3479 kmem_cache_destroy(openowner_slab);
3481 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3485 static void init_nfs4_replay(struct nfs4_replay *rp)
3487 rp->rp_status = nfserr_serverfault;
3489 rp->rp_buf = rp->rp_ibuf;
3490 mutex_init(&rp->rp_mutex);
3493 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3494 struct nfs4_stateowner *so)
3496 if (!nfsd4_has_session(cstate)) {
3497 mutex_lock(&so->so_replay.rp_mutex);
3498 cstate->replay_owner = nfs4_get_stateowner(so);
3502 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3504 struct nfs4_stateowner *so = cstate->replay_owner;
3507 cstate->replay_owner = NULL;
3508 mutex_unlock(&so->so_replay.rp_mutex);
3509 nfs4_put_stateowner(so);
3513 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3515 struct nfs4_stateowner *sop;
3517 sop = kmem_cache_alloc(slab, GFP_KERNEL);
3521 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3522 if (!sop->so_owner.data) {
3523 kmem_cache_free(slab, sop);
3526 sop->so_owner.len = owner->len;
3528 INIT_LIST_HEAD(&sop->so_stateids);
3529 sop->so_client = clp;
3530 init_nfs4_replay(&sop->so_replay);
3531 atomic_set(&sop->so_count, 1);
3535 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3537 lockdep_assert_held(&clp->cl_lock);
3539 list_add(&oo->oo_owner.so_strhash,
3540 &clp->cl_ownerstr_hashtbl[strhashval]);
3541 list_add(&oo->oo_perclient, &clp->cl_openowners);
3544 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3546 unhash_openowner_locked(openowner(so));
3549 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3551 struct nfs4_openowner *oo = openowner(so);
3553 kmem_cache_free(openowner_slab, oo);
3556 static const struct nfs4_stateowner_operations openowner_ops = {
3557 .so_unhash = nfs4_unhash_openowner,
3558 .so_free = nfs4_free_openowner,
3561 static struct nfs4_ol_stateid *
3562 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3564 struct nfs4_ol_stateid *local, *ret = NULL;
3565 struct nfs4_openowner *oo = open->op_openowner;
3567 lockdep_assert_held(&fp->fi_lock);
3569 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3570 /* ignore lock owners */
3571 if (local->st_stateowner->so_is_open_owner == 0)
3573 if (local->st_stateowner != &oo->oo_owner)
3575 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
3577 refcount_inc(&ret->st_stid.sc_count);
3585 nfsd4_verify_open_stid(struct nfs4_stid *s)
3587 __be32 ret = nfs_ok;
3589 switch (s->sc_type) {
3592 case NFS4_CLOSED_STID:
3593 case NFS4_CLOSED_DELEG_STID:
3594 ret = nfserr_bad_stateid;
3596 case NFS4_REVOKED_DELEG_STID:
3597 ret = nfserr_deleg_revoked;
3602 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3604 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
3608 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
3609 ret = nfsd4_verify_open_stid(&stp->st_stid);
3611 mutex_unlock(&stp->st_mutex);
3615 static struct nfs4_ol_stateid *
3616 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3618 struct nfs4_ol_stateid *stp;
3620 spin_lock(&fp->fi_lock);
3621 stp = nfsd4_find_existing_open(fp, open);
3622 spin_unlock(&fp->fi_lock);
3623 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
3625 nfs4_put_stid(&stp->st_stid);
3630 static struct nfs4_openowner *
3631 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3632 struct nfsd4_compound_state *cstate)
3634 struct nfs4_client *clp = cstate->clp;
3635 struct nfs4_openowner *oo, *ret;
3637 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3640 oo->oo_owner.so_ops = &openowner_ops;
3641 oo->oo_owner.so_is_open_owner = 1;
3642 oo->oo_owner.so_seqid = open->op_seqid;
3644 if (nfsd4_has_session(cstate))
3645 oo->oo_flags |= NFS4_OO_CONFIRMED;
3647 oo->oo_last_closed_stid = NULL;
3648 INIT_LIST_HEAD(&oo->oo_close_lru);
3649 spin_lock(&clp->cl_lock);
3650 ret = find_openstateowner_str_locked(strhashval, open, clp);
3652 hash_openowner(oo, clp, strhashval);
3655 nfs4_free_stateowner(&oo->oo_owner);
3657 spin_unlock(&clp->cl_lock);
3661 static struct nfs4_ol_stateid *
3662 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
3665 struct nfs4_openowner *oo = open->op_openowner;
3666 struct nfs4_ol_stateid *retstp = NULL;
3667 struct nfs4_ol_stateid *stp;
3670 /* We are moving these outside of the spinlocks to avoid the warnings */
3671 mutex_init(&stp->st_mutex);
3672 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
3675 spin_lock(&oo->oo_owner.so_client->cl_lock);
3676 spin_lock(&fp->fi_lock);
3678 retstp = nfsd4_find_existing_open(fp, open);
3682 open->op_stp = NULL;
3683 refcount_inc(&stp->st_stid.sc_count);
3684 stp->st_stid.sc_type = NFS4_OPEN_STID;
3685 INIT_LIST_HEAD(&stp->st_locks);
3686 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3688 stp->st_stid.sc_file = fp;
3689 stp->st_access_bmap = 0;
3690 stp->st_deny_bmap = 0;
3691 stp->st_openstp = NULL;
3692 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3693 list_add(&stp->st_perfile, &fp->fi_stateids);
3696 spin_unlock(&fp->fi_lock);
3697 spin_unlock(&oo->oo_owner.so_client->cl_lock);
3699 /* Handle races with CLOSE */
3700 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
3701 nfs4_put_stid(&retstp->st_stid);
3704 /* To keep mutex tracking happy */
3705 mutex_unlock(&stp->st_mutex);
3712 * In the 4.0 case we need to keep the owners around a little while to handle
3713 * CLOSE replay. We still do need to release any file access that is held by
3714 * them before returning however.
3717 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3719 struct nfs4_ol_stateid *last;
3720 struct nfs4_openowner *oo = openowner(s->st_stateowner);
3721 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3724 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3727 * We know that we hold one reference via nfsd4_close, and another
3728 * "persistent" reference for the client. If the refcount is higher
3729 * than 2, then there are still calls in progress that are using this
3730 * stateid. We can't put the sc_file reference until they are finished.
3731 * Wait for the refcount to drop to 2. Since it has been unhashed,
3732 * there should be no danger of the refcount going back up again at
3735 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
3737 release_all_access(s);
3738 if (s->st_stid.sc_file) {
3739 put_nfs4_file(s->st_stid.sc_file);
3740 s->st_stid.sc_file = NULL;
3743 spin_lock(&nn->client_lock);
3744 last = oo->oo_last_closed_stid;
3745 oo->oo_last_closed_stid = s;
3746 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3747 oo->oo_time = get_seconds();
3748 spin_unlock(&nn->client_lock);
3750 nfs4_put_stid(&last->st_stid);
3753 /* search file_hashtbl[] for file */
3754 static struct nfs4_file *
3755 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3757 struct nfs4_file *fp;
3759 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3760 if (fh_match(&fp->fi_fhandle, fh)) {
3761 if (refcount_inc_not_zero(&fp->fi_ref))
3769 find_file(struct knfsd_fh *fh)
3771 struct nfs4_file *fp;
3772 unsigned int hashval = file_hashval(fh);
3775 fp = find_file_locked(fh, hashval);
3780 static struct nfs4_file *
3781 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3783 struct nfs4_file *fp;
3784 unsigned int hashval = file_hashval(fh);
3787 fp = find_file_locked(fh, hashval);
3792 spin_lock(&state_lock);
3793 fp = find_file_locked(fh, hashval);
3794 if (likely(fp == NULL)) {
3795 nfsd4_init_file(fh, hashval, new);
3798 spin_unlock(&state_lock);
3804 * Called to check deny when READ with all zero stateid or
3805 * WRITE with all zero or all one stateid
3808 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3810 struct nfs4_file *fp;
3811 __be32 ret = nfs_ok;
3813 fp = find_file(¤t_fh->fh_handle);
3816 /* Check for conflicting share reservations */
3817 spin_lock(&fp->fi_lock);
3818 if (fp->fi_share_deny & deny_type)
3819 ret = nfserr_locked;
3820 spin_unlock(&fp->fi_lock);
3825 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3827 struct nfs4_delegation *dp = cb_to_delegation(cb);
3828 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3831 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3834 * We can't do this in nfsd_break_deleg_cb because it is
3835 * already holding inode->i_lock.
3837 * If the dl_time != 0, then we know that it has already been
3838 * queued for a lease break. Don't queue it again.
3840 spin_lock(&state_lock);
3841 if (dp->dl_time == 0) {
3842 dp->dl_time = get_seconds();
3843 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3845 spin_unlock(&state_lock);
3848 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3849 struct rpc_task *task)
3851 struct nfs4_delegation *dp = cb_to_delegation(cb);
3853 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3856 switch (task->tk_status) {
3860 case -NFS4ERR_BAD_STATEID:
3862 * Race: client probably got cb_recall before open reply
3863 * granting delegation.
3865 if (dp->dl_retries--) {
3866 rpc_delay(task, 2 * HZ);
3875 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3877 struct nfs4_delegation *dp = cb_to_delegation(cb);
3879 nfs4_put_stid(&dp->dl_stid);
3882 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3883 .prepare = nfsd4_cb_recall_prepare,
3884 .done = nfsd4_cb_recall_done,
3885 .release = nfsd4_cb_recall_release,
3888 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3891 * We're assuming the state code never drops its reference
3892 * without first removing the lease. Since we're in this lease
3893 * callback (and since the lease code is serialized by the kernel
3894 * lock) we know the server hasn't removed the lease yet, we know
3895 * it's safe to take a reference.
3897 refcount_inc(&dp->dl_stid.sc_count);
3898 nfsd4_run_cb(&dp->dl_recall);
3901 /* Called from break_lease() with i_lock held. */
3903 nfsd_break_deleg_cb(struct file_lock *fl)
3906 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3907 struct nfs4_delegation *dp;
3910 WARN(1, "(%p)->fl_owner NULL\n", fl);
3913 if (fp->fi_had_conflict) {
3914 WARN(1, "duplicate break on %p\n", fp);
3918 * We don't want the locks code to timeout the lease for us;
3919 * we'll remove it ourself if a delegation isn't returned
3922 fl->fl_break_time = 0;
3924 spin_lock(&fp->fi_lock);
3925 fp->fi_had_conflict = true;
3927 * If there are no delegations on the list, then return true
3928 * so that the lease code will go ahead and delete it.
3930 if (list_empty(&fp->fi_delegations))
3933 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3934 nfsd_break_one_deleg(dp);
3935 spin_unlock(&fp->fi_lock);
3940 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3941 struct list_head *dispose)
3944 return lease_modify(onlist, arg, dispose);
3949 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3950 .lm_break = nfsd_break_deleg_cb,
3951 .lm_change = nfsd_change_deleg_cb,
3954 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3956 if (nfsd4_has_session(cstate))
3958 if (seqid == so->so_seqid - 1)
3959 return nfserr_replay_me;
3960 if (seqid == so->so_seqid)
3962 return nfserr_bad_seqid;
3965 static __be32 lookup_clientid(clientid_t *clid,
3966 struct nfsd4_compound_state *cstate,
3967 struct nfsd_net *nn)
3969 struct nfs4_client *found;
3972 found = cstate->clp;
3973 if (!same_clid(&found->cl_clientid, clid))
3974 return nfserr_stale_clientid;
3978 if (STALE_CLIENTID(clid, nn))
3979 return nfserr_stale_clientid;
3982 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3983 * cached already then we know this is for is for v4.0 and "sessions"
3986 WARN_ON_ONCE(cstate->session);
3987 spin_lock(&nn->client_lock);
3988 found = find_confirmed_client(clid, false, nn);
3990 spin_unlock(&nn->client_lock);
3991 return nfserr_expired;
3993 atomic_inc(&found->cl_refcount);
3994 spin_unlock(&nn->client_lock);
3996 /* Cache the nfs4_client in cstate! */
3997 cstate->clp = found;
4002 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4003 struct nfsd4_open *open, struct nfsd_net *nn)
4005 clientid_t *clientid = &open->op_clientid;
4006 struct nfs4_client *clp = NULL;
4007 unsigned int strhashval;
4008 struct nfs4_openowner *oo = NULL;
4011 if (STALE_CLIENTID(&open->op_clientid, nn))
4012 return nfserr_stale_clientid;
4014 * In case we need it later, after we've already created the
4015 * file and don't want to risk a further failure:
4017 open->op_file = nfsd4_alloc_file();
4018 if (open->op_file == NULL)
4019 return nfserr_jukebox;
4021 status = lookup_clientid(clientid, cstate, nn);
4026 strhashval = ownerstr_hashval(&open->op_owner);
4027 oo = find_openstateowner_str(strhashval, open, clp);
4028 open->op_openowner = oo;
4032 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4033 /* Replace unconfirmed owners without checking for replay. */
4034 release_openowner(oo);
4035 open->op_openowner = NULL;
4038 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4043 oo = alloc_init_open_stateowner(strhashval, open, cstate);
4045 return nfserr_jukebox;
4046 open->op_openowner = oo;
4048 open->op_stp = nfs4_alloc_open_stateid(clp);
4050 return nfserr_jukebox;
4052 if (nfsd4_has_session(cstate) &&
4053 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4054 open->op_odstate = alloc_clnt_odstate(clp);
4055 if (!open->op_odstate)
4056 return nfserr_jukebox;
4062 static inline __be32
4063 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4065 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4066 return nfserr_openmode;
4071 static int share_access_to_flags(u32 share_access)
4073 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4076 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4078 struct nfs4_stid *ret;
4080 ret = find_stateid_by_type(cl, s,
4081 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4084 return delegstateid(ret);
4087 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4089 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4090 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4094 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4095 struct nfs4_delegation **dp)
4098 __be32 status = nfserr_bad_stateid;
4099 struct nfs4_delegation *deleg;
4101 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4104 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4105 nfs4_put_stid(&deleg->dl_stid);
4106 if (cl->cl_minorversion)
4107 status = nfserr_deleg_revoked;
4110 flags = share_access_to_flags(open->op_share_access);
4111 status = nfs4_check_delegmode(deleg, flags);
4113 nfs4_put_stid(&deleg->dl_stid);
4118 if (!nfsd4_is_deleg_cur(open))
4122 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4126 static inline int nfs4_access_to_access(u32 nfs4_access)
4130 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4131 flags |= NFSD_MAY_READ;
4132 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4133 flags |= NFSD_MAY_WRITE;
4137 static inline __be32
4138 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4139 struct nfsd4_open *open)
4141 struct iattr iattr = {
4142 .ia_valid = ATTR_SIZE,
4145 if (!open->op_truncate)
4147 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4148 return nfserr_inval;
4149 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4152 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4153 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4154 struct nfsd4_open *open)
4156 struct file *filp = NULL;
4158 int oflag = nfs4_access_to_omode(open->op_share_access);
4159 int access = nfs4_access_to_access(open->op_share_access);
4160 unsigned char old_access_bmap, old_deny_bmap;
4162 spin_lock(&fp->fi_lock);
4165 * Are we trying to set a deny mode that would conflict with
4168 status = nfs4_file_check_deny(fp, open->op_share_deny);
4169 if (status != nfs_ok) {
4170 spin_unlock(&fp->fi_lock);
4174 /* set access to the file */
4175 status = nfs4_file_get_access(fp, open->op_share_access);
4176 if (status != nfs_ok) {
4177 spin_unlock(&fp->fi_lock);
4181 /* Set access bits in stateid */
4182 old_access_bmap = stp->st_access_bmap;
4183 set_access(open->op_share_access, stp);
4185 /* Set new deny mask */
4186 old_deny_bmap = stp->st_deny_bmap;
4187 set_deny(open->op_share_deny, stp);
4188 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4190 if (!fp->fi_fds[oflag]) {
4191 spin_unlock(&fp->fi_lock);
4192 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
4194 goto out_put_access;
4195 spin_lock(&fp->fi_lock);
4196 if (!fp->fi_fds[oflag]) {
4197 fp->fi_fds[oflag] = filp;
4201 spin_unlock(&fp->fi_lock);
4205 status = nfsd4_truncate(rqstp, cur_fh, open);
4207 goto out_put_access;
4211 stp->st_access_bmap = old_access_bmap;
4212 nfs4_file_put_access(fp, open->op_share_access);
4213 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4218 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)
4221 unsigned char old_deny_bmap = stp->st_deny_bmap;
4223 if (!test_access(open->op_share_access, stp))
4224 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4226 /* test and set deny mode */
4227 spin_lock(&fp->fi_lock);
4228 status = nfs4_file_check_deny(fp, open->op_share_deny);
4229 if (status == nfs_ok) {
4230 set_deny(open->op_share_deny, stp);
4231 fp->fi_share_deny |=
4232 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4234 spin_unlock(&fp->fi_lock);
4236 if (status != nfs_ok)
4239 status = nfsd4_truncate(rqstp, cur_fh, open);
4240 if (status != nfs_ok)
4241 reset_union_bmap_deny(old_deny_bmap, stp);
4245 /* Should we give out recallable state?: */
4246 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4248 if (clp->cl_cb_state == NFSD4_CB_UP)
4251 * In the sessions case, since we don't have to establish a
4252 * separate connection for callbacks, we assume it's OK
4253 * until we hear otherwise:
4255 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4258 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
4260 struct file_lock *fl;
4262 fl = locks_alloc_lock();
4265 fl->fl_lmops = &nfsd_lease_mng_ops;
4266 fl->fl_flags = FL_DELEG;
4267 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4268 fl->fl_end = OFFSET_MAX;
4269 fl->fl_owner = (fl_owner_t)fp;
4270 fl->fl_pid = current->tgid;
4275 * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
4276 * @dp: a pointer to the nfs4_delegation we're adding.
4279 * On success: Return code will be 0 on success.
4281 * On error: -EAGAIN if there was an existing delegation.
4282 * nonzero if there is an error in other cases.
4286 static int nfs4_setlease(struct nfs4_delegation *dp)
4288 struct nfs4_file *fp = dp->dl_stid.sc_file;
4289 struct file_lock *fl;
4293 fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
4296 filp = find_readable_file(fp);
4298 /* We should always have a readable file here */
4300 locks_free_lock(fl);
4304 status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
4306 locks_free_lock(fl);
4309 spin_lock(&state_lock);
4310 spin_lock(&fp->fi_lock);
4311 /* Did the lease get broken before we took the lock? */
4313 if (fp->fi_had_conflict)
4316 if (fp->fi_deleg_file) {
4317 status = hash_delegation_locked(dp, fp);
4320 fp->fi_deleg_file = filp;
4321 fp->fi_delegees = 0;
4322 status = hash_delegation_locked(dp, fp);
4323 spin_unlock(&fp->fi_lock);
4324 spin_unlock(&state_lock);
4326 /* Should never happen, this is a new fi_deleg_file */
4332 spin_unlock(&fp->fi_lock);
4333 spin_unlock(&state_lock);
4339 static struct nfs4_delegation *
4340 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4341 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4344 struct nfs4_delegation *dp;
4346 if (fp->fi_had_conflict)
4347 return ERR_PTR(-EAGAIN);
4349 spin_lock(&state_lock);
4350 spin_lock(&fp->fi_lock);
4351 status = nfs4_get_existing_delegation(clp, fp);
4352 spin_unlock(&fp->fi_lock);
4353 spin_unlock(&state_lock);
4356 return ERR_PTR(status);
4358 dp = alloc_init_deleg(clp, fh, odstate);
4360 return ERR_PTR(-ENOMEM);
4363 spin_lock(&state_lock);
4364 spin_lock(&fp->fi_lock);
4365 dp->dl_stid.sc_file = fp;
4366 if (!fp->fi_deleg_file) {
4367 spin_unlock(&fp->fi_lock);
4368 spin_unlock(&state_lock);
4369 status = nfs4_setlease(dp);
4372 if (fp->fi_had_conflict) {
4376 status = hash_delegation_locked(dp, fp);
4378 spin_unlock(&fp->fi_lock);
4379 spin_unlock(&state_lock);
4382 put_clnt_odstate(dp->dl_clnt_odstate);
4383 nfs4_put_stid(&dp->dl_stid);
4384 return ERR_PTR(status);
4389 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4391 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4392 if (status == -EAGAIN)
4393 open->op_why_no_deleg = WND4_CONTENTION;
4395 open->op_why_no_deleg = WND4_RESOURCE;
4396 switch (open->op_deleg_want) {
4397 case NFS4_SHARE_WANT_READ_DELEG:
4398 case NFS4_SHARE_WANT_WRITE_DELEG:
4399 case NFS4_SHARE_WANT_ANY_DELEG:
4401 case NFS4_SHARE_WANT_CANCEL:
4402 open->op_why_no_deleg = WND4_CANCELLED;
4404 case NFS4_SHARE_WANT_NO_DELEG:
4411 * Attempt to hand out a delegation.
4413 * Note we don't support write delegations, and won't until the vfs has
4414 * proper support for them.
4417 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4418 struct nfs4_ol_stateid *stp)
4420 struct nfs4_delegation *dp;
4421 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4422 struct nfs4_client *clp = stp->st_stid.sc_client;
4426 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4427 open->op_recall = 0;
4428 switch (open->op_claim_type) {
4429 case NFS4_OPEN_CLAIM_PREVIOUS:
4431 open->op_recall = 1;
4432 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4435 case NFS4_OPEN_CLAIM_NULL:
4436 case NFS4_OPEN_CLAIM_FH:
4438 * Let's not give out any delegations till everyone's
4439 * had the chance to reclaim theirs, *and* until
4440 * NLM locks have all been reclaimed:
4442 if (locks_in_grace(clp->net))
4444 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4447 * Also, if the file was opened for write or
4448 * create, there's a good chance the client's
4449 * about to write to it, resulting in an
4450 * immediate recall (since we don't support
4451 * write delegations):
4453 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4455 if (open->op_create == NFS4_OPEN_CREATE)
4461 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4465 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4467 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4468 STATEID_VAL(&dp->dl_stid.sc_stateid));
4469 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4470 nfs4_put_stid(&dp->dl_stid);
4473 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4474 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4475 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4476 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4477 open->op_recall = 1;
4480 /* 4.1 client asking for a delegation? */
4481 if (open->op_deleg_want)
4482 nfsd4_open_deleg_none_ext(open, status);
4486 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4487 struct nfs4_delegation *dp)
4489 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4490 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4491 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4492 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4493 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4494 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4495 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4496 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4498 /* Otherwise the client must be confused wanting a delegation
4499 * it already has, therefore we don't return
4500 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4505 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4507 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4508 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4509 struct nfs4_file *fp = NULL;
4510 struct nfs4_ol_stateid *stp = NULL;
4511 struct nfs4_delegation *dp = NULL;
4513 bool new_stp = false;
4516 * Lookup file; if found, lookup stateid and check open request,
4517 * and check for delegations in the process of being recalled.
4518 * If not found, create the nfs4_file struct
4520 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
4521 if (fp != open->op_file) {
4522 status = nfs4_check_deleg(cl, open, &dp);
4525 stp = nfsd4_find_and_lock_existing_open(fp, open);
4527 open->op_file = NULL;
4528 status = nfserr_bad_stateid;
4529 if (nfsd4_is_deleg_cur(open))
4534 stp = init_open_stateid(fp, open);
4540 * OPEN the file, or upgrade an existing OPEN.
4541 * If truncate fails, the OPEN fails.
4543 * stp is already locked.
4546 /* Stateid was found, this is an OPEN upgrade */
4547 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4549 mutex_unlock(&stp->st_mutex);
4553 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4555 stp->st_stid.sc_type = NFS4_CLOSED_STID;
4556 release_open_stateid(stp);
4557 mutex_unlock(&stp->st_mutex);
4561 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4563 if (stp->st_clnt_odstate == open->op_odstate)
4564 open->op_odstate = NULL;
4567 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4568 mutex_unlock(&stp->st_mutex);
4570 if (nfsd4_has_session(&resp->cstate)) {
4571 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4572 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4573 open->op_why_no_deleg = WND4_NOT_WANTED;
4579 * Attempt to hand out a delegation. No error return, because the
4580 * OPEN succeeds even if we fail.
4582 nfs4_open_delegation(current_fh, open, stp);
4586 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4587 STATEID_VAL(&stp->st_stid.sc_stateid));
4589 /* 4.1 client trying to upgrade/downgrade delegation? */
4590 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4591 open->op_deleg_want)
4592 nfsd4_deleg_xgrade_none_ext(open, dp);
4596 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4597 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4599 * To finish the open response, we just need to set the rflags.
4601 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4602 if (nfsd4_has_session(&resp->cstate))
4603 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
4604 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
4605 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4608 nfs4_put_stid(&dp->dl_stid);
4610 nfs4_put_stid(&stp->st_stid);
4615 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4616 struct nfsd4_open *open)
4618 if (open->op_openowner) {
4619 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4621 nfsd4_cstate_assign_replay(cstate, so);
4622 nfs4_put_stateowner(so);
4625 kmem_cache_free(file_slab, open->op_file);
4627 nfs4_put_stid(&open->op_stp->st_stid);
4628 if (open->op_odstate)
4629 kmem_cache_free(odstate_slab, open->op_odstate);
4633 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4634 union nfsd4_op_u *u)
4636 clientid_t *clid = &u->renew;
4637 struct nfs4_client *clp;
4639 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4641 dprintk("process_renew(%08x/%08x): starting\n",
4642 clid->cl_boot, clid->cl_id);
4643 status = lookup_clientid(clid, cstate, nn);
4647 status = nfserr_cb_path_down;
4648 if (!list_empty(&clp->cl_delegations)
4649 && clp->cl_cb_state != NFSD4_CB_UP)
4657 nfsd4_end_grace(struct nfsd_net *nn)
4659 /* do nothing if grace period already ended */
4660 if (nn->grace_ended)
4663 dprintk("NFSD: end of grace period\n");
4664 nn->grace_ended = true;
4666 * If the server goes down again right now, an NFSv4
4667 * client will still be allowed to reclaim after it comes back up,
4668 * even if it hasn't yet had a chance to reclaim state this time.
4671 nfsd4_record_grace_done(nn);
4673 * At this point, NFSv4 clients can still reclaim. But if the
4674 * server crashes, any that have not yet reclaimed will be out
4675 * of luck on the next boot.
4677 * (NFSv4.1+ clients are considered to have reclaimed once they
4678 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4679 * have reclaimed after their first OPEN.)
4681 locks_end_grace(&nn->nfsd4_manager);
4683 * At this point, and once lockd and/or any other containers
4684 * exit their grace period, further reclaims will fail and
4685 * regular locking can resume.
4690 nfs4_laundromat(struct nfsd_net *nn)
4692 struct nfs4_client *clp;
4693 struct nfs4_openowner *oo;
4694 struct nfs4_delegation *dp;
4695 struct nfs4_ol_stateid *stp;
4696 struct nfsd4_blocked_lock *nbl;
4697 struct list_head *pos, *next, reaplist;
4698 time_t cutoff = get_seconds() - nn->nfsd4_lease;
4699 time_t t, new_timeo = nn->nfsd4_lease;
4701 dprintk("NFSD: laundromat service - starting\n");
4702 nfsd4_end_grace(nn);
4703 INIT_LIST_HEAD(&reaplist);
4704 spin_lock(&nn->client_lock);
4705 list_for_each_safe(pos, next, &nn->client_lru) {
4706 clp = list_entry(pos, struct nfs4_client, cl_lru);
4707 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4708 t = clp->cl_time - cutoff;
4709 new_timeo = min(new_timeo, t);
4712 if (mark_client_expired_locked(clp)) {
4713 dprintk("NFSD: client in use (clientid %08x)\n",
4714 clp->cl_clientid.cl_id);
4717 list_add(&clp->cl_lru, &reaplist);
4719 spin_unlock(&nn->client_lock);
4720 list_for_each_safe(pos, next, &reaplist) {
4721 clp = list_entry(pos, struct nfs4_client, cl_lru);
4722 dprintk("NFSD: purging unused client (clientid %08x)\n",
4723 clp->cl_clientid.cl_id);
4724 list_del_init(&clp->cl_lru);
4727 spin_lock(&state_lock);
4728 list_for_each_safe(pos, next, &nn->del_recall_lru) {
4729 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4730 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4731 t = dp->dl_time - cutoff;
4732 new_timeo = min(new_timeo, t);
4735 WARN_ON(!unhash_delegation_locked(dp));
4736 list_add(&dp->dl_recall_lru, &reaplist);
4738 spin_unlock(&state_lock);
4739 while (!list_empty(&reaplist)) {
4740 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4742 list_del_init(&dp->dl_recall_lru);
4743 revoke_delegation(dp);
4746 spin_lock(&nn->client_lock);
4747 while (!list_empty(&nn->close_lru)) {
4748 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4750 if (time_after((unsigned long)oo->oo_time,
4751 (unsigned long)cutoff)) {
4752 t = oo->oo_time - cutoff;
4753 new_timeo = min(new_timeo, t);
4756 list_del_init(&oo->oo_close_lru);
4757 stp = oo->oo_last_closed_stid;
4758 oo->oo_last_closed_stid = NULL;
4759 spin_unlock(&nn->client_lock);
4760 nfs4_put_stid(&stp->st_stid);
4761 spin_lock(&nn->client_lock);
4763 spin_unlock(&nn->client_lock);
4766 * It's possible for a client to try and acquire an already held lock
4767 * that is being held for a long time, and then lose interest in it.
4768 * So, we clean out any un-revisited request after a lease period
4769 * under the assumption that the client is no longer interested.
4771 * RFC5661, sec. 9.6 states that the client must not rely on getting
4772 * notifications and must continue to poll for locks, even when the
4773 * server supports them. Thus this shouldn't lead to clients blocking
4774 * indefinitely once the lock does become free.
4776 BUG_ON(!list_empty(&reaplist));
4777 spin_lock(&nn->blocked_locks_lock);
4778 while (!list_empty(&nn->blocked_locks_lru)) {
4779 nbl = list_first_entry(&nn->blocked_locks_lru,
4780 struct nfsd4_blocked_lock, nbl_lru);
4781 if (time_after((unsigned long)nbl->nbl_time,
4782 (unsigned long)cutoff)) {
4783 t = nbl->nbl_time - cutoff;
4784 new_timeo = min(new_timeo, t);
4787 list_move(&nbl->nbl_lru, &reaplist);
4788 list_del_init(&nbl->nbl_list);
4790 spin_unlock(&nn->blocked_locks_lock);
4792 while (!list_empty(&reaplist)) {
4793 nbl = list_first_entry(&nn->blocked_locks_lru,
4794 struct nfsd4_blocked_lock, nbl_lru);
4795 list_del_init(&nbl->nbl_lru);
4796 posix_unblock_lock(&nbl->nbl_lock);
4797 free_blocked_lock(nbl);
4800 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4804 static struct workqueue_struct *laundry_wq;
4805 static void laundromat_main(struct work_struct *);
4808 laundromat_main(struct work_struct *laundry)
4811 struct delayed_work *dwork = to_delayed_work(laundry);
4812 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4815 t = nfs4_laundromat(nn);
4816 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4817 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4820 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4822 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4823 return nfserr_bad_stateid;
4828 access_permit_read(struct nfs4_ol_stateid *stp)
4830 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4831 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4832 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4836 access_permit_write(struct nfs4_ol_stateid *stp)
4838 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4839 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4843 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4845 __be32 status = nfserr_openmode;
4847 /* For lock stateid's, we test the parent open, not the lock: */
4848 if (stp->st_openstp)
4849 stp = stp->st_openstp;
4850 if ((flags & WR_STATE) && !access_permit_write(stp))
4852 if ((flags & RD_STATE) && !access_permit_read(stp))
4859 static inline __be32
4860 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4862 if (ONE_STATEID(stateid) && (flags & RD_STATE))
4864 else if (opens_in_grace(net)) {
4865 /* Answer in remaining cases depends on existence of
4866 * conflicting state; so we must wait out the grace period. */
4867 return nfserr_grace;
4868 } else if (flags & WR_STATE)
4869 return nfs4_share_conflict(current_fh,
4870 NFS4_SHARE_DENY_WRITE);
4871 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4872 return nfs4_share_conflict(current_fh,
4873 NFS4_SHARE_DENY_READ);
4877 * Allow READ/WRITE during grace period on recovered state only for files
4878 * that are not able to provide mandatory locking.
4881 grace_disallows_io(struct net *net, struct inode *inode)
4883 return opens_in_grace(net) && mandatory_lock(inode);
4886 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4889 * When sessions are used the stateid generation number is ignored
4892 if (has_session && in->si_generation == 0)
4895 if (in->si_generation == ref->si_generation)
4898 /* If the client sends us a stateid from the future, it's buggy: */
4899 if (nfsd4_stateid_generation_after(in, ref))
4900 return nfserr_bad_stateid;
4902 * However, we could see a stateid from the past, even from a
4903 * non-buggy client. For example, if the client sends a lock
4904 * while some IO is outstanding, the lock may bump si_generation
4905 * while the IO is still in flight. The client could avoid that
4906 * situation by waiting for responses on all the IO requests,
4907 * but better performance may result in retrying IO that
4908 * receives an old_stateid error if requests are rarely
4909 * reordered in flight:
4911 return nfserr_old_stateid;
4914 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
4918 spin_lock(&s->sc_lock);
4919 ret = nfsd4_verify_open_stid(s);
4921 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
4922 spin_unlock(&s->sc_lock);
4926 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4928 if (ols->st_stateowner->so_is_open_owner &&
4929 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4930 return nfserr_bad_stateid;
4934 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4936 struct nfs4_stid *s;
4937 __be32 status = nfserr_bad_stateid;
4939 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4941 /* Client debugging aid. */
4942 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4943 char addr_str[INET6_ADDRSTRLEN];
4944 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4946 pr_warn_ratelimited("NFSD: client %s testing state ID "
4947 "with incorrect client ID\n", addr_str);
4950 spin_lock(&cl->cl_lock);
4951 s = find_stateid_locked(cl, stateid);
4954 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
4957 switch (s->sc_type) {
4958 case NFS4_DELEG_STID:
4961 case NFS4_REVOKED_DELEG_STID:
4962 status = nfserr_deleg_revoked;
4964 case NFS4_OPEN_STID:
4965 case NFS4_LOCK_STID:
4966 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
4969 printk("unknown stateid type %x\n", s->sc_type);
4971 case NFS4_CLOSED_STID:
4972 case NFS4_CLOSED_DELEG_STID:
4973 status = nfserr_bad_stateid;
4976 spin_unlock(&cl->cl_lock);
4981 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4982 stateid_t *stateid, unsigned char typemask,
4983 struct nfs4_stid **s, struct nfsd_net *nn)
4986 bool return_revoked = false;
4989 * only return revoked delegations if explicitly asked.
4990 * otherwise we report revoked or bad_stateid status.
4992 if (typemask & NFS4_REVOKED_DELEG_STID)
4993 return_revoked = true;
4994 else if (typemask & NFS4_DELEG_STID)
4995 typemask |= NFS4_REVOKED_DELEG_STID;
4997 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4998 return nfserr_bad_stateid;
4999 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
5000 if (status == nfserr_stale_clientid) {
5001 if (cstate->session)
5002 return nfserr_bad_stateid;
5003 return nfserr_stale_stateid;
5007 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5009 return nfserr_bad_stateid;
5010 if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5012 if (cstate->minorversion)
5013 return nfserr_deleg_revoked;
5014 return nfserr_bad_stateid;
5019 static struct file *
5020 nfs4_find_file(struct nfs4_stid *s, int flags)
5025 switch (s->sc_type) {
5026 case NFS4_DELEG_STID:
5027 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5029 return get_file(s->sc_file->fi_deleg_file);
5030 case NFS4_OPEN_STID:
5031 case NFS4_LOCK_STID:
5032 if (flags & RD_STATE)
5033 return find_readable_file(s->sc_file);
5035 return find_writeable_file(s->sc_file);
5043 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
5047 status = nfsd4_check_openowner_confirmed(ols);
5050 return nfs4_check_openmode(ols, flags);
5054 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5055 struct file **filpp, bool *tmp_file, int flags)
5057 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5061 file = nfs4_find_file(s, flags);
5063 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5064 acc | NFSD_MAY_OWNER_OVERRIDE);
5072 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
5084 * Checks for stateid operations
5087 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5088 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5089 stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
5091 struct inode *ino = d_inode(fhp->fh_dentry);
5092 struct net *net = SVC_NET(rqstp);
5093 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5094 struct nfs4_stid *s = NULL;
5102 if (grace_disallows_io(net, ino))
5103 return nfserr_grace;
5105 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5106 status = check_special_stateids(net, fhp, stateid, flags);
5110 status = nfsd4_lookup_stateid(cstate, stateid,
5111 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5115 status = nfsd4_stid_check_stateid_generation(stateid, s,
5116 nfsd4_has_session(cstate));
5120 switch (s->sc_type) {
5121 case NFS4_DELEG_STID:
5122 status = nfs4_check_delegmode(delegstateid(s), flags);
5124 case NFS4_OPEN_STID:
5125 case NFS4_LOCK_STID:
5126 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
5129 status = nfserr_bad_stateid;
5134 status = nfs4_check_fh(fhp, s);
5137 if (!status && filpp)
5138 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
5146 * Test if the stateid is valid
5149 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5150 union nfsd4_op_u *u)
5152 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5153 struct nfsd4_test_stateid_id *stateid;
5154 struct nfs4_client *cl = cstate->session->se_client;
5156 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5157 stateid->ts_id_status =
5158 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5164 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5166 struct nfs4_ol_stateid *stp = openlockstateid(s);
5169 ret = nfsd4_lock_ol_stateid(stp);
5173 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5177 ret = nfserr_locks_held;
5178 if (check_for_locks(stp->st_stid.sc_file,
5179 lockowner(stp->st_stateowner)))
5182 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5183 release_lock_stateid(stp);
5187 mutex_unlock(&stp->st_mutex);
5194 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5195 union nfsd4_op_u *u)
5197 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5198 stateid_t *stateid = &free_stateid->fr_stateid;
5199 struct nfs4_stid *s;
5200 struct nfs4_delegation *dp;
5201 struct nfs4_client *cl = cstate->session->se_client;
5202 __be32 ret = nfserr_bad_stateid;
5204 spin_lock(&cl->cl_lock);
5205 s = find_stateid_locked(cl, stateid);
5208 spin_lock(&s->sc_lock);
5209 switch (s->sc_type) {
5210 case NFS4_DELEG_STID:
5211 ret = nfserr_locks_held;
5213 case NFS4_OPEN_STID:
5214 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5217 ret = nfserr_locks_held;
5219 case NFS4_LOCK_STID:
5220 spin_unlock(&s->sc_lock);
5221 refcount_inc(&s->sc_count);
5222 spin_unlock(&cl->cl_lock);
5223 ret = nfsd4_free_lock_stateid(stateid, s);
5225 case NFS4_REVOKED_DELEG_STID:
5226 spin_unlock(&s->sc_lock);
5227 dp = delegstateid(s);
5228 list_del_init(&dp->dl_recall_lru);
5229 spin_unlock(&cl->cl_lock);
5233 /* Default falls through and returns nfserr_bad_stateid */
5235 spin_unlock(&s->sc_lock);
5237 spin_unlock(&cl->cl_lock);
5245 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5246 RD_STATE : WR_STATE;
5249 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5251 struct svc_fh *current_fh = &cstate->current_fh;
5252 struct nfs4_stateowner *sop = stp->st_stateowner;
5255 status = nfsd4_check_seqid(cstate, sop, seqid);
5258 status = nfsd4_lock_ol_stateid(stp);
5259 if (status != nfs_ok)
5261 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5262 if (status == nfs_ok)
5263 status = nfs4_check_fh(current_fh, &stp->st_stid);
5264 if (status != nfs_ok)
5265 mutex_unlock(&stp->st_mutex);
5270 * Checks for sequence id mutating operations.
5273 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5274 stateid_t *stateid, char typemask,
5275 struct nfs4_ol_stateid **stpp,
5276 struct nfsd_net *nn)
5279 struct nfs4_stid *s;
5280 struct nfs4_ol_stateid *stp = NULL;
5282 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5283 seqid, STATEID_VAL(stateid));
5286 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5289 stp = openlockstateid(s);
5290 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5292 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5296 nfs4_put_stid(&stp->st_stid);
5300 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5301 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5304 struct nfs4_openowner *oo;
5305 struct nfs4_ol_stateid *stp;
5307 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5308 NFS4_OPEN_STID, &stp, nn);
5311 oo = openowner(stp->st_stateowner);
5312 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5313 mutex_unlock(&stp->st_mutex);
5314 nfs4_put_stid(&stp->st_stid);
5315 return nfserr_bad_stateid;
5322 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5323 union nfsd4_op_u *u)
5325 struct nfsd4_open_confirm *oc = &u->open_confirm;
5327 struct nfs4_openowner *oo;
5328 struct nfs4_ol_stateid *stp;
5329 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5331 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5332 cstate->current_fh.fh_dentry);
5334 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5338 status = nfs4_preprocess_seqid_op(cstate,
5339 oc->oc_seqid, &oc->oc_req_stateid,
5340 NFS4_OPEN_STID, &stp, nn);
5343 oo = openowner(stp->st_stateowner);
5344 status = nfserr_bad_stateid;
5345 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5346 mutex_unlock(&stp->st_mutex);
5349 oo->oo_flags |= NFS4_OO_CONFIRMED;
5350 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5351 mutex_unlock(&stp->st_mutex);
5352 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5353 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5355 nfsd4_client_record_create(oo->oo_owner.so_client);
5358 nfs4_put_stid(&stp->st_stid);
5360 nfsd4_bump_seqid(cstate, status);
5364 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5366 if (!test_access(access, stp))
5368 nfs4_file_put_access(stp->st_stid.sc_file, access);
5369 clear_access(access, stp);
5372 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5374 switch (to_access) {
5375 case NFS4_SHARE_ACCESS_READ:
5376 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5377 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5379 case NFS4_SHARE_ACCESS_WRITE:
5380 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5381 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5383 case NFS4_SHARE_ACCESS_BOTH:
5391 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5392 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
5394 struct nfsd4_open_downgrade *od = &u->open_downgrade;
5396 struct nfs4_ol_stateid *stp;
5397 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5399 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5400 cstate->current_fh.fh_dentry);
5402 /* We don't yet support WANT bits: */
5403 if (od->od_deleg_want)
5404 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5407 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5408 &od->od_stateid, &stp, nn);
5411 status = nfserr_inval;
5412 if (!test_access(od->od_share_access, stp)) {
5413 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5414 stp->st_access_bmap, od->od_share_access);
5417 if (!test_deny(od->od_share_deny, stp)) {
5418 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5419 stp->st_deny_bmap, od->od_share_deny);
5422 nfs4_stateid_downgrade(stp, od->od_share_access);
5423 reset_union_bmap_deny(od->od_share_deny, stp);
5424 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5427 mutex_unlock(&stp->st_mutex);
5428 nfs4_put_stid(&stp->st_stid);
5430 nfsd4_bump_seqid(cstate, status);
5434 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5436 struct nfs4_client *clp = s->st_stid.sc_client;
5438 LIST_HEAD(reaplist);
5440 spin_lock(&clp->cl_lock);
5441 unhashed = unhash_open_stateid(s, &reaplist);
5443 if (clp->cl_minorversion) {
5445 put_ol_stateid_locked(s, &reaplist);
5446 spin_unlock(&clp->cl_lock);
5447 free_ol_stateid_reaplist(&reaplist);
5449 spin_unlock(&clp->cl_lock);
5450 free_ol_stateid_reaplist(&reaplist);
5452 move_to_close_lru(s, clp->net);
5457 * nfs4_unlock_state() called after encode
5460 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5461 union nfsd4_op_u *u)
5463 struct nfsd4_close *close = &u->close;
5465 struct nfs4_ol_stateid *stp;
5466 struct net *net = SVC_NET(rqstp);
5467 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5469 dprintk("NFSD: nfsd4_close on file %pd\n",
5470 cstate->current_fh.fh_dentry);
5472 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5474 NFS4_OPEN_STID|NFS4_CLOSED_STID,
5476 nfsd4_bump_seqid(cstate, status);
5480 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5481 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5483 nfsd4_close_open_stateid(stp);
5484 mutex_unlock(&stp->st_mutex);
5486 /* See RFC5661 sectionm 18.2.4 */
5487 if (stp->st_stid.sc_client->cl_minorversion)
5488 memcpy(&close->cl_stateid, &close_stateid,
5489 sizeof(close->cl_stateid));
5491 /* put reference from nfs4_preprocess_seqid_op */
5492 nfs4_put_stid(&stp->st_stid);
5498 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5499 union nfsd4_op_u *u)
5501 struct nfsd4_delegreturn *dr = &u->delegreturn;
5502 struct nfs4_delegation *dp;
5503 stateid_t *stateid = &dr->dr_stateid;
5504 struct nfs4_stid *s;
5506 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5508 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5511 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5514 dp = delegstateid(s);
5515 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
5519 destroy_delegation(dp);
5521 nfs4_put_stid(&dp->dl_stid);
5527 end_offset(u64 start, u64 len)
5532 return end >= start ? end: NFS4_MAX_UINT64;
5535 /* last octet in a range */
5537 last_byte_offset(u64 start, u64 len)
5543 return end > start ? end - 1: NFS4_MAX_UINT64;
5547 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5548 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5549 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5550 * locking, this prevents us from being completely protocol-compliant. The
5551 * real solution to this problem is to start using unsigned file offsets in
5552 * the VFS, but this is a very deep change!
5555 nfs4_transform_lock_offset(struct file_lock *lock)
5557 if (lock->fl_start < 0)
5558 lock->fl_start = OFFSET_MAX;
5559 if (lock->fl_end < 0)
5560 lock->fl_end = OFFSET_MAX;
5564 nfsd4_fl_get_owner(fl_owner_t owner)
5566 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5568 nfs4_get_stateowner(&lo->lo_owner);
5573 nfsd4_fl_put_owner(fl_owner_t owner)
5575 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5578 nfs4_put_stateowner(&lo->lo_owner);
5582 nfsd4_lm_notify(struct file_lock *fl)
5584 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
5585 struct net *net = lo->lo_owner.so_client->net;
5586 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5587 struct nfsd4_blocked_lock *nbl = container_of(fl,
5588 struct nfsd4_blocked_lock, nbl_lock);
5591 /* An empty list means that something else is going to be using it */
5592 spin_lock(&nn->blocked_locks_lock);
5593 if (!list_empty(&nbl->nbl_list)) {
5594 list_del_init(&nbl->nbl_list);
5595 list_del_init(&nbl->nbl_lru);
5598 spin_unlock(&nn->blocked_locks_lock);
5601 nfsd4_run_cb(&nbl->nbl_cb);
5604 static const struct lock_manager_operations nfsd_posix_mng_ops = {
5605 .lm_notify = nfsd4_lm_notify,
5606 .lm_get_owner = nfsd4_fl_get_owner,
5607 .lm_put_owner = nfsd4_fl_put_owner,
5611 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5613 struct nfs4_lockowner *lo;
5615 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5616 lo = (struct nfs4_lockowner *) fl->fl_owner;
5617 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5618 lo->lo_owner.so_owner.len, GFP_KERNEL);
5619 if (!deny->ld_owner.data)
5620 /* We just don't care that much */
5622 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5623 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5626 deny->ld_owner.len = 0;
5627 deny->ld_owner.data = NULL;
5628 deny->ld_clientid.cl_boot = 0;
5629 deny->ld_clientid.cl_id = 0;
5631 deny->ld_start = fl->fl_start;
5632 deny->ld_length = NFS4_MAX_UINT64;
5633 if (fl->fl_end != NFS4_MAX_UINT64)
5634 deny->ld_length = fl->fl_end - fl->fl_start + 1;
5635 deny->ld_type = NFS4_READ_LT;
5636 if (fl->fl_type != F_RDLCK)
5637 deny->ld_type = NFS4_WRITE_LT;
5640 static struct nfs4_lockowner *
5641 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5643 unsigned int strhashval = ownerstr_hashval(owner);
5644 struct nfs4_stateowner *so;
5646 lockdep_assert_held(&clp->cl_lock);
5648 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5650 if (so->so_is_open_owner)
5652 if (same_owner_str(so, owner))
5653 return lockowner(nfs4_get_stateowner(so));
5658 static struct nfs4_lockowner *
5659 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5661 struct nfs4_lockowner *lo;
5663 spin_lock(&clp->cl_lock);
5664 lo = find_lockowner_str_locked(clp, owner);
5665 spin_unlock(&clp->cl_lock);
5669 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5671 unhash_lockowner_locked(lockowner(sop));
5674 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5676 struct nfs4_lockowner *lo = lockowner(sop);
5678 kmem_cache_free(lockowner_slab, lo);
5681 static const struct nfs4_stateowner_operations lockowner_ops = {
5682 .so_unhash = nfs4_unhash_lockowner,
5683 .so_free = nfs4_free_lockowner,
5687 * Alloc a lock owner structure.
5688 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5691 * strhashval = ownerstr_hashval
5693 static struct nfs4_lockowner *
5694 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5695 struct nfs4_ol_stateid *open_stp,
5696 struct nfsd4_lock *lock)
5698 struct nfs4_lockowner *lo, *ret;
5700 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5703 INIT_LIST_HEAD(&lo->lo_blocked);
5704 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5705 lo->lo_owner.so_is_open_owner = 0;
5706 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5707 lo->lo_owner.so_ops = &lockowner_ops;
5708 spin_lock(&clp->cl_lock);
5709 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5711 list_add(&lo->lo_owner.so_strhash,
5712 &clp->cl_ownerstr_hashtbl[strhashval]);
5715 nfs4_free_stateowner(&lo->lo_owner);
5717 spin_unlock(&clp->cl_lock);
5721 static struct nfs4_ol_stateid *
5722 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5724 struct nfs4_ol_stateid *lst;
5725 struct nfs4_client *clp = lo->lo_owner.so_client;
5727 lockdep_assert_held(&clp->cl_lock);
5729 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5730 if (lst->st_stid.sc_type != NFS4_LOCK_STID)
5732 if (lst->st_stid.sc_file == fp) {
5733 refcount_inc(&lst->st_stid.sc_count);
5740 static struct nfs4_ol_stateid *
5741 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5742 struct nfs4_file *fp, struct inode *inode,
5743 struct nfs4_ol_stateid *open_stp)
5745 struct nfs4_client *clp = lo->lo_owner.so_client;
5746 struct nfs4_ol_stateid *retstp;
5748 mutex_init(&stp->st_mutex);
5749 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
5751 spin_lock(&clp->cl_lock);
5752 spin_lock(&fp->fi_lock);
5753 retstp = find_lock_stateid(lo, fp);
5757 refcount_inc(&stp->st_stid.sc_count);
5758 stp->st_stid.sc_type = NFS4_LOCK_STID;
5759 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5761 stp->st_stid.sc_file = fp;
5762 stp->st_access_bmap = 0;
5763 stp->st_deny_bmap = open_stp->st_deny_bmap;
5764 stp->st_openstp = open_stp;
5765 list_add(&stp->st_locks, &open_stp->st_locks);
5766 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5767 list_add(&stp->st_perfile, &fp->fi_stateids);
5769 spin_unlock(&fp->fi_lock);
5770 spin_unlock(&clp->cl_lock);
5772 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
5773 nfs4_put_stid(&retstp->st_stid);
5776 /* To keep mutex tracking happy */
5777 mutex_unlock(&stp->st_mutex);
5783 static struct nfs4_ol_stateid *
5784 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5785 struct inode *inode, struct nfs4_ol_stateid *ost,
5788 struct nfs4_stid *ns = NULL;
5789 struct nfs4_ol_stateid *lst;
5790 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5791 struct nfs4_client *clp = oo->oo_owner.so_client;
5794 spin_lock(&clp->cl_lock);
5795 lst = find_lock_stateid(lo, fi);
5796 spin_unlock(&clp->cl_lock);
5798 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
5800 nfs4_put_stid(&lst->st_stid);
5802 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
5806 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
5807 if (lst == openlockstateid(ns))
5816 check_lock_length(u64 offset, u64 length)
5818 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5819 (length > ~offset)));
5822 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5824 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5826 lockdep_assert_held(&fp->fi_lock);
5828 if (test_access(access, lock_stp))
5830 __nfs4_file_get_access(fp, access);
5831 set_access(access, lock_stp);
5835 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5836 struct nfs4_ol_stateid *ost,
5837 struct nfsd4_lock *lock,
5838 struct nfs4_ol_stateid **plst, bool *new)
5841 struct nfs4_file *fi = ost->st_stid.sc_file;
5842 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5843 struct nfs4_client *cl = oo->oo_owner.so_client;
5844 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5845 struct nfs4_lockowner *lo;
5846 struct nfs4_ol_stateid *lst;
5847 unsigned int strhashval;
5849 lo = find_lockowner_str(cl, &lock->lk_new_owner);
5851 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5852 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5854 return nfserr_jukebox;
5856 /* with an existing lockowner, seqids must be the same */
5857 status = nfserr_bad_seqid;
5858 if (!cstate->minorversion &&
5859 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5863 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5865 status = nfserr_jukebox;
5872 nfs4_put_stateowner(&lo->lo_owner);
5880 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5881 union nfsd4_op_u *u)
5883 struct nfsd4_lock *lock = &u->lock;
5884 struct nfs4_openowner *open_sop = NULL;
5885 struct nfs4_lockowner *lock_sop = NULL;
5886 struct nfs4_ol_stateid *lock_stp = NULL;
5887 struct nfs4_ol_stateid *open_stp = NULL;
5888 struct nfs4_file *fp;
5889 struct file *filp = NULL;
5890 struct nfsd4_blocked_lock *nbl = NULL;
5891 struct file_lock *file_lock = NULL;
5892 struct file_lock *conflock = NULL;
5897 unsigned char fl_type;
5898 unsigned int fl_flags = FL_POSIX;
5899 struct net *net = SVC_NET(rqstp);
5900 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5902 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5903 (long long) lock->lk_offset,
5904 (long long) lock->lk_length);
5906 if (check_lock_length(lock->lk_offset, lock->lk_length))
5907 return nfserr_inval;
5909 if ((status = fh_verify(rqstp, &cstate->current_fh,
5910 S_IFREG, NFSD_MAY_LOCK))) {
5911 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5915 if (lock->lk_is_new) {
5916 if (nfsd4_has_session(cstate))
5917 /* See rfc 5661 18.10.3: given clientid is ignored: */
5918 memcpy(&lock->lk_new_clientid,
5919 &cstate->session->se_client->cl_clientid,
5920 sizeof(clientid_t));
5922 status = nfserr_stale_clientid;
5923 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5926 /* validate and update open stateid and open seqid */
5927 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5928 lock->lk_new_open_seqid,
5929 &lock->lk_new_open_stateid,
5933 mutex_unlock(&open_stp->st_mutex);
5934 open_sop = openowner(open_stp->st_stateowner);
5935 status = nfserr_bad_stateid;
5936 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5937 &lock->lk_new_clientid))
5939 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5942 status = nfs4_preprocess_seqid_op(cstate,
5943 lock->lk_old_lock_seqid,
5944 &lock->lk_old_lock_stateid,
5945 NFS4_LOCK_STID, &lock_stp, nn);
5949 lock_sop = lockowner(lock_stp->st_stateowner);
5951 lkflg = setlkflg(lock->lk_type);
5952 status = nfs4_check_openmode(lock_stp, lkflg);
5956 status = nfserr_grace;
5957 if (locks_in_grace(net) && !lock->lk_reclaim)
5959 status = nfserr_no_grace;
5960 if (!locks_in_grace(net) && lock->lk_reclaim)
5963 fp = lock_stp->st_stid.sc_file;
5964 switch (lock->lk_type) {
5966 if (nfsd4_has_session(cstate))
5967 fl_flags |= FL_SLEEP;
5970 spin_lock(&fp->fi_lock);
5971 filp = find_readable_file_locked(fp);
5973 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5974 spin_unlock(&fp->fi_lock);
5977 case NFS4_WRITEW_LT:
5978 if (nfsd4_has_session(cstate))
5979 fl_flags |= FL_SLEEP;
5982 spin_lock(&fp->fi_lock);
5983 filp = find_writeable_file_locked(fp);
5985 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
5986 spin_unlock(&fp->fi_lock);
5990 status = nfserr_inval;
5995 status = nfserr_openmode;
5999 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6001 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6002 status = nfserr_jukebox;
6006 file_lock = &nbl->nbl_lock;
6007 file_lock->fl_type = fl_type;
6008 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6009 file_lock->fl_pid = current->tgid;
6010 file_lock->fl_file = filp;
6011 file_lock->fl_flags = fl_flags;
6012 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6013 file_lock->fl_start = lock->lk_offset;
6014 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6015 nfs4_transform_lock_offset(file_lock);
6017 conflock = locks_alloc_lock();
6019 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6020 status = nfserr_jukebox;
6024 if (fl_flags & FL_SLEEP) {
6025 nbl->nbl_time = jiffies;
6026 spin_lock(&nn->blocked_locks_lock);
6027 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6028 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6029 spin_unlock(&nn->blocked_locks_lock);
6032 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
6034 case 0: /* success! */
6035 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6038 case FILE_LOCK_DEFERRED:
6041 case -EAGAIN: /* conflock holds conflicting lock */
6042 status = nfserr_denied;
6043 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6044 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6047 status = nfserr_deadlock;
6050 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6051 status = nfserrno(err);
6056 /* dequeue it if we queued it before */
6057 if (fl_flags & FL_SLEEP) {
6058 spin_lock(&nn->blocked_locks_lock);
6059 list_del_init(&nbl->nbl_list);
6060 list_del_init(&nbl->nbl_lru);
6061 spin_unlock(&nn->blocked_locks_lock);
6063 free_blocked_lock(nbl);
6068 /* Bump seqid manually if the 4.0 replay owner is openowner */
6069 if (cstate->replay_owner &&
6070 cstate->replay_owner != &lock_sop->lo_owner &&
6071 seqid_mutating_err(ntohl(status)))
6072 lock_sop->lo_owner.so_seqid++;
6075 * If this is a new, never-before-used stateid, and we are
6076 * returning an error, then just go ahead and release it.
6078 if (status && new) {
6079 lock_stp->st_stid.sc_type = NFS4_CLOSED_STID;
6080 release_lock_stateid(lock_stp);
6083 mutex_unlock(&lock_stp->st_mutex);
6085 nfs4_put_stid(&lock_stp->st_stid);
6088 nfs4_put_stid(&open_stp->st_stid);
6089 nfsd4_bump_seqid(cstate, status);
6091 locks_free_lock(conflock);
6096 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6097 * so we do a temporary open here just to get an open file to pass to
6098 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6101 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6104 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
6106 err = nfserrno(vfs_test_lock(file, lock));
6116 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6117 union nfsd4_op_u *u)
6119 struct nfsd4_lockt *lockt = &u->lockt;
6120 struct file_lock *file_lock = NULL;
6121 struct nfs4_lockowner *lo = NULL;
6123 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6125 if (locks_in_grace(SVC_NET(rqstp)))
6126 return nfserr_grace;
6128 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6129 return nfserr_inval;
6131 if (!nfsd4_has_session(cstate)) {
6132 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
6137 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6140 file_lock = locks_alloc_lock();
6142 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6143 status = nfserr_jukebox;
6147 switch (lockt->lt_type) {
6150 file_lock->fl_type = F_RDLCK;
6153 case NFS4_WRITEW_LT:
6154 file_lock->fl_type = F_WRLCK;
6157 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6158 status = nfserr_inval;
6162 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6164 file_lock->fl_owner = (fl_owner_t)lo;
6165 file_lock->fl_pid = current->tgid;
6166 file_lock->fl_flags = FL_POSIX;
6168 file_lock->fl_start = lockt->lt_offset;
6169 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6171 nfs4_transform_lock_offset(file_lock);
6173 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6177 if (file_lock->fl_type != F_UNLCK) {
6178 status = nfserr_denied;
6179 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6183 nfs4_put_stateowner(&lo->lo_owner);
6185 locks_free_lock(file_lock);
6190 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6191 union nfsd4_op_u *u)
6193 struct nfsd4_locku *locku = &u->locku;
6194 struct nfs4_ol_stateid *stp;
6195 struct file *filp = NULL;
6196 struct file_lock *file_lock = NULL;
6199 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6201 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6202 (long long) locku->lu_offset,
6203 (long long) locku->lu_length);
6205 if (check_lock_length(locku->lu_offset, locku->lu_length))
6206 return nfserr_inval;
6208 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6209 &locku->lu_stateid, NFS4_LOCK_STID,
6213 filp = find_any_file(stp->st_stid.sc_file);
6215 status = nfserr_lock_range;
6218 file_lock = locks_alloc_lock();
6220 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6221 status = nfserr_jukebox;
6225 file_lock->fl_type = F_UNLCK;
6226 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6227 file_lock->fl_pid = current->tgid;
6228 file_lock->fl_file = filp;
6229 file_lock->fl_flags = FL_POSIX;
6230 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6231 file_lock->fl_start = locku->lu_offset;
6233 file_lock->fl_end = last_byte_offset(locku->lu_offset,
6235 nfs4_transform_lock_offset(file_lock);
6237 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
6239 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6242 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6246 mutex_unlock(&stp->st_mutex);
6247 nfs4_put_stid(&stp->st_stid);
6249 nfsd4_bump_seqid(cstate, status);
6251 locks_free_lock(file_lock);
6255 status = nfserrno(err);
6261 * true: locks held by lockowner
6262 * false: no locks held by lockowner
6265 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6267 struct file_lock *fl;
6269 struct file *filp = find_any_file(fp);
6270 struct inode *inode;
6271 struct file_lock_context *flctx;
6274 /* Any valid lock stateid should have some sort of access */
6279 inode = file_inode(filp);
6280 flctx = inode->i_flctx;
6282 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6283 spin_lock(&flctx->flc_lock);
6284 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6285 if (fl->fl_owner == (fl_owner_t)lowner) {
6290 spin_unlock(&flctx->flc_lock);
6297 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6298 struct nfsd4_compound_state *cstate,
6299 union nfsd4_op_u *u)
6301 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6302 clientid_t *clid = &rlockowner->rl_clientid;
6303 struct nfs4_stateowner *sop;
6304 struct nfs4_lockowner *lo = NULL;
6305 struct nfs4_ol_stateid *stp;
6306 struct xdr_netobj *owner = &rlockowner->rl_owner;
6307 unsigned int hashval = ownerstr_hashval(owner);
6309 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6310 struct nfs4_client *clp;
6311 LIST_HEAD (reaplist);
6313 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6314 clid->cl_boot, clid->cl_id);
6316 status = lookup_clientid(clid, cstate, nn);
6321 /* Find the matching lock stateowner */
6322 spin_lock(&clp->cl_lock);
6323 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6326 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6329 /* see if there are still any locks associated with it */
6330 lo = lockowner(sop);
6331 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6332 if (check_for_locks(stp->st_stid.sc_file, lo)) {
6333 status = nfserr_locks_held;
6334 spin_unlock(&clp->cl_lock);
6339 nfs4_get_stateowner(sop);
6343 spin_unlock(&clp->cl_lock);
6347 unhash_lockowner_locked(lo);
6348 while (!list_empty(&lo->lo_owner.so_stateids)) {
6349 stp = list_first_entry(&lo->lo_owner.so_stateids,
6350 struct nfs4_ol_stateid,
6352 WARN_ON(!unhash_lock_stateid(stp));
6353 put_ol_stateid_locked(stp, &reaplist);
6355 spin_unlock(&clp->cl_lock);
6356 free_ol_stateid_reaplist(&reaplist);
6357 nfs4_put_stateowner(&lo->lo_owner);
6362 static inline struct nfs4_client_reclaim *
6365 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6369 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
6371 struct nfs4_client_reclaim *crp;
6373 crp = nfsd4_find_reclaim_client(name, nn);
6374 return (crp && crp->cr_clp);
6378 * failure => all reset bets are off, nfserr_no_grace...
6380 struct nfs4_client_reclaim *
6381 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
6383 unsigned int strhashval;
6384 struct nfs4_client_reclaim *crp;
6386 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
6387 crp = alloc_reclaim();
6389 strhashval = clientstr_hashval(name);
6390 INIT_LIST_HEAD(&crp->cr_strhash);
6391 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6392 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
6394 nn->reclaim_str_hashtbl_size++;
6400 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6402 list_del(&crp->cr_strhash);
6404 nn->reclaim_str_hashtbl_size--;
6408 nfs4_release_reclaim(struct nfsd_net *nn)
6410 struct nfs4_client_reclaim *crp = NULL;
6413 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6414 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6415 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6416 struct nfs4_client_reclaim, cr_strhash);
6417 nfs4_remove_reclaim_record(crp, nn);
6420 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6424 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6425 struct nfs4_client_reclaim *
6426 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6428 unsigned int strhashval;
6429 struct nfs4_client_reclaim *crp = NULL;
6431 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6433 strhashval = clientstr_hashval(recdir);
6434 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6435 if (same_name(crp->cr_recdir, recdir)) {
6443 * Called from OPEN. Look for clientid in reclaim list.
6446 nfs4_check_open_reclaim(clientid_t *clid,
6447 struct nfsd4_compound_state *cstate,
6448 struct nfsd_net *nn)
6452 /* find clientid in conf_id_hashtbl */
6453 status = lookup_clientid(clid, cstate, nn);
6455 return nfserr_reclaim_bad;
6457 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6458 return nfserr_no_grace;
6460 if (nfsd4_client_record_check(cstate->clp))
6461 return nfserr_reclaim_bad;
6466 #ifdef CONFIG_NFSD_FAULT_INJECTION
6468 put_client(struct nfs4_client *clp)
6470 atomic_dec(&clp->cl_refcount);
6473 static struct nfs4_client *
6474 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6476 struct nfs4_client *clp;
6477 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6480 if (!nfsd_netns_ready(nn))
6483 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6484 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
6491 nfsd_inject_print_clients(void)
6493 struct nfs4_client *clp;
6495 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6497 char buf[INET6_ADDRSTRLEN];
6499 if (!nfsd_netns_ready(nn))
6502 spin_lock(&nn->client_lock);
6503 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6504 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6505 pr_info("NFS Client: %s\n", buf);
6508 spin_unlock(&nn->client_lock);
6514 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
6517 struct nfs4_client *clp;
6518 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6521 if (!nfsd_netns_ready(nn))
6524 spin_lock(&nn->client_lock);
6525 clp = nfsd_find_client(addr, addr_size);
6527 if (mark_client_expired_locked(clp) == nfs_ok)
6532 spin_unlock(&nn->client_lock);
6541 nfsd_inject_forget_clients(u64 max)
6544 struct nfs4_client *clp, *next;
6545 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6547 LIST_HEAD(reaplist);
6549 if (!nfsd_netns_ready(nn))
6552 spin_lock(&nn->client_lock);
6553 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6554 if (mark_client_expired_locked(clp) == nfs_ok) {
6555 list_add(&clp->cl_lru, &reaplist);
6556 if (max != 0 && ++count >= max)
6560 spin_unlock(&nn->client_lock);
6562 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
6568 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
6571 char buf[INET6_ADDRSTRLEN];
6572 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6573 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
6577 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
6578 struct list_head *collect)
6580 struct nfs4_client *clp = lst->st_stid.sc_client;
6581 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6587 lockdep_assert_held(&nn->client_lock);
6588 atomic_inc(&clp->cl_refcount);
6589 list_add(&lst->st_locks, collect);
6592 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
6593 struct list_head *collect,
6594 bool (*func)(struct nfs4_ol_stateid *))
6596 struct nfs4_openowner *oop;
6597 struct nfs4_ol_stateid *stp, *st_next;
6598 struct nfs4_ol_stateid *lst, *lst_next;
6601 spin_lock(&clp->cl_lock);
6602 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
6603 list_for_each_entry_safe(stp, st_next,
6604 &oop->oo_owner.so_stateids, st_perstateowner) {
6605 list_for_each_entry_safe(lst, lst_next,
6606 &stp->st_locks, st_locks) {
6609 nfsd_inject_add_lock_to_list(lst,
6614 * Despite the fact that these functions deal
6615 * with 64-bit integers for "count", we must
6616 * ensure that it doesn't blow up the
6617 * clp->cl_refcount. Throw a warning if we
6618 * start to approach INT_MAX here.
6620 WARN_ON_ONCE(count == (INT_MAX / 2));
6627 spin_unlock(&clp->cl_lock);
6633 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
6636 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
6640 nfsd_print_client_locks(struct nfs4_client *clp)
6642 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
6643 nfsd_print_count(clp, count, "locked files");
6648 nfsd_inject_print_locks(void)
6650 struct nfs4_client *clp;
6652 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6655 if (!nfsd_netns_ready(nn))
6658 spin_lock(&nn->client_lock);
6659 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6660 count += nfsd_print_client_locks(clp);
6661 spin_unlock(&nn->client_lock);
6667 nfsd_reap_locks(struct list_head *reaplist)
6669 struct nfs4_client *clp;
6670 struct nfs4_ol_stateid *stp, *next;
6672 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
6673 list_del_init(&stp->st_locks);
6674 clp = stp->st_stid.sc_client;
6675 nfs4_put_stid(&stp->st_stid);
6681 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
6683 unsigned int count = 0;
6684 struct nfs4_client *clp;
6685 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6687 LIST_HEAD(reaplist);
6689 if (!nfsd_netns_ready(nn))
6692 spin_lock(&nn->client_lock);
6693 clp = nfsd_find_client(addr, addr_size);
6695 count = nfsd_collect_client_locks(clp, &reaplist, 0);
6696 spin_unlock(&nn->client_lock);
6697 nfsd_reap_locks(&reaplist);
6702 nfsd_inject_forget_locks(u64 max)
6705 struct nfs4_client *clp;
6706 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6708 LIST_HEAD(reaplist);
6710 if (!nfsd_netns_ready(nn))
6713 spin_lock(&nn->client_lock);
6714 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6715 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
6716 if (max != 0 && count >= max)
6719 spin_unlock(&nn->client_lock);
6720 nfsd_reap_locks(&reaplist);
6725 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
6726 struct list_head *collect,
6727 void (*func)(struct nfs4_openowner *))
6729 struct nfs4_openowner *oop, *next;
6730 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6734 lockdep_assert_held(&nn->client_lock);
6736 spin_lock(&clp->cl_lock);
6737 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
6741 atomic_inc(&clp->cl_refcount);
6742 list_add(&oop->oo_perclient, collect);
6747 * Despite the fact that these functions deal with
6748 * 64-bit integers for "count", we must ensure that
6749 * it doesn't blow up the clp->cl_refcount. Throw a
6750 * warning if we start to approach INT_MAX here.
6752 WARN_ON_ONCE(count == (INT_MAX / 2));
6756 spin_unlock(&clp->cl_lock);
6762 nfsd_print_client_openowners(struct nfs4_client *clp)
6764 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6766 nfsd_print_count(clp, count, "openowners");
6771 nfsd_collect_client_openowners(struct nfs4_client *clp,
6772 struct list_head *collect, u64 max)
6774 return nfsd_foreach_client_openowner(clp, max, collect,
6775 unhash_openowner_locked);
6779 nfsd_inject_print_openowners(void)
6781 struct nfs4_client *clp;
6783 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6786 if (!nfsd_netns_ready(nn))
6789 spin_lock(&nn->client_lock);
6790 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6791 count += nfsd_print_client_openowners(clp);
6792 spin_unlock(&nn->client_lock);
6798 nfsd_reap_openowners(struct list_head *reaplist)
6800 struct nfs4_client *clp;
6801 struct nfs4_openowner *oop, *next;
6803 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6804 list_del_init(&oop->oo_perclient);
6805 clp = oop->oo_owner.so_client;
6806 release_openowner(oop);
6812 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6815 unsigned int count = 0;
6816 struct nfs4_client *clp;
6817 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6819 LIST_HEAD(reaplist);
6821 if (!nfsd_netns_ready(nn))
6824 spin_lock(&nn->client_lock);
6825 clp = nfsd_find_client(addr, addr_size);
6827 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6828 spin_unlock(&nn->client_lock);
6829 nfsd_reap_openowners(&reaplist);
6834 nfsd_inject_forget_openowners(u64 max)
6837 struct nfs4_client *clp;
6838 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6840 LIST_HEAD(reaplist);
6842 if (!nfsd_netns_ready(nn))
6845 spin_lock(&nn->client_lock);
6846 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6847 count += nfsd_collect_client_openowners(clp, &reaplist,
6849 if (max != 0 && count >= max)
6852 spin_unlock(&nn->client_lock);
6853 nfsd_reap_openowners(&reaplist);
6857 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6858 struct list_head *victims)
6860 struct nfs4_delegation *dp, *next;
6861 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6865 lockdep_assert_held(&nn->client_lock);
6867 spin_lock(&state_lock);
6868 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6871 * It's not safe to mess with delegations that have a
6872 * non-zero dl_time. They might have already been broken
6873 * and could be processed by the laundromat outside of
6874 * the state_lock. Just leave them be.
6876 if (dp->dl_time != 0)
6879 atomic_inc(&clp->cl_refcount);
6880 WARN_ON(!unhash_delegation_locked(dp));
6881 list_add(&dp->dl_recall_lru, victims);
6885 * Despite the fact that these functions deal with
6886 * 64-bit integers for "count", we must ensure that
6887 * it doesn't blow up the clp->cl_refcount. Throw a
6888 * warning if we start to approach INT_MAX here.
6890 WARN_ON_ONCE(count == (INT_MAX / 2));
6894 spin_unlock(&state_lock);
6899 nfsd_print_client_delegations(struct nfs4_client *clp)
6901 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6903 nfsd_print_count(clp, count, "delegations");
6908 nfsd_inject_print_delegations(void)
6910 struct nfs4_client *clp;
6912 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6915 if (!nfsd_netns_ready(nn))
6918 spin_lock(&nn->client_lock);
6919 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6920 count += nfsd_print_client_delegations(clp);
6921 spin_unlock(&nn->client_lock);
6927 nfsd_forget_delegations(struct list_head *reaplist)
6929 struct nfs4_client *clp;
6930 struct nfs4_delegation *dp, *next;
6932 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6933 list_del_init(&dp->dl_recall_lru);
6934 clp = dp->dl_stid.sc_client;
6935 revoke_delegation(dp);
6941 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6945 struct nfs4_client *clp;
6946 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6948 LIST_HEAD(reaplist);
6950 if (!nfsd_netns_ready(nn))
6953 spin_lock(&nn->client_lock);
6954 clp = nfsd_find_client(addr, addr_size);
6956 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6957 spin_unlock(&nn->client_lock);
6959 nfsd_forget_delegations(&reaplist);
6964 nfsd_inject_forget_delegations(u64 max)
6967 struct nfs4_client *clp;
6968 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6970 LIST_HEAD(reaplist);
6972 if (!nfsd_netns_ready(nn))
6975 spin_lock(&nn->client_lock);
6976 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6977 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6978 if (max != 0 && count >= max)
6981 spin_unlock(&nn->client_lock);
6982 nfsd_forget_delegations(&reaplist);
6987 nfsd_recall_delegations(struct list_head *reaplist)
6989 struct nfs4_client *clp;
6990 struct nfs4_delegation *dp, *next;
6992 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6993 list_del_init(&dp->dl_recall_lru);
6994 clp = dp->dl_stid.sc_client;
6996 * We skipped all entries that had a zero dl_time before,
6997 * so we can now reset the dl_time back to 0. If a delegation
6998 * break comes in now, then it won't make any difference since
6999 * we're recalling it either way.
7001 spin_lock(&state_lock);
7003 spin_unlock(&state_lock);
7004 nfsd_break_one_deleg(dp);
7010 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
7014 struct nfs4_client *clp;
7015 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7017 LIST_HEAD(reaplist);
7019 if (!nfsd_netns_ready(nn))
7022 spin_lock(&nn->client_lock);
7023 clp = nfsd_find_client(addr, addr_size);
7025 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7026 spin_unlock(&nn->client_lock);
7028 nfsd_recall_delegations(&reaplist);
7033 nfsd_inject_recall_delegations(u64 max)
7036 struct nfs4_client *clp, *next;
7037 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7039 LIST_HEAD(reaplist);
7041 if (!nfsd_netns_ready(nn))
7044 spin_lock(&nn->client_lock);
7045 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7046 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7047 if (max != 0 && ++count >= max)
7050 spin_unlock(&nn->client_lock);
7051 nfsd_recall_delegations(&reaplist);
7054 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7057 * Since the lifetime of a delegation isn't limited to that of an open, a
7058 * client may quite reasonably hang on to a delegation as long as it has
7059 * the inode cached. This becomes an obvious problem the first time a
7060 * client's inode cache approaches the size of the server's total memory.
7062 * For now we avoid this problem by imposing a hard limit on the number
7063 * of delegations, which varies according to the server's memory size.
7066 set_max_delegations(void)
7069 * Allow at most 4 delegations per megabyte of RAM. Quick
7070 * estimates suggest that in the worst case (where every delegation
7071 * is for a different inode), a delegation could take about 1.5K,
7072 * giving a worst case usage of about 6% of memory.
7074 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7077 static int nfs4_state_create_net(struct net *net)
7079 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7082 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7083 CLIENT_HASH_SIZE, GFP_KERNEL);
7084 if (!nn->conf_id_hashtbl)
7086 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7087 CLIENT_HASH_SIZE, GFP_KERNEL);
7088 if (!nn->unconf_id_hashtbl)
7090 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
7091 SESSION_HASH_SIZE, GFP_KERNEL);
7092 if (!nn->sessionid_hashtbl)
7095 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7096 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7097 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7099 for (i = 0; i < SESSION_HASH_SIZE; i++)
7100 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7101 nn->conf_name_tree = RB_ROOT;
7102 nn->unconf_name_tree = RB_ROOT;
7103 INIT_LIST_HEAD(&nn->client_lru);
7104 INIT_LIST_HEAD(&nn->close_lru);
7105 INIT_LIST_HEAD(&nn->del_recall_lru);
7106 spin_lock_init(&nn->client_lock);
7108 spin_lock_init(&nn->blocked_locks_lock);
7109 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7111 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7117 kfree(nn->unconf_id_hashtbl);
7119 kfree(nn->conf_id_hashtbl);
7125 nfs4_state_destroy_net(struct net *net)
7128 struct nfs4_client *clp = NULL;
7129 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7131 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7132 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7133 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7134 destroy_client(clp);
7138 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7139 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7140 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7141 destroy_client(clp);
7145 kfree(nn->sessionid_hashtbl);
7146 kfree(nn->unconf_id_hashtbl);
7147 kfree(nn->conf_id_hashtbl);
7152 nfs4_state_start_net(struct net *net)
7154 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7157 ret = nfs4_state_create_net(net);
7160 nn->boot_time = get_seconds();
7161 nn->grace_ended = false;
7162 nn->nfsd4_manager.block_opens = true;
7163 locks_start_grace(net, &nn->nfsd4_manager);
7164 nfsd4_client_tracking_init(net);
7165 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %x)\n",
7166 nn->nfsd4_grace, net->ns.inum);
7167 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7171 /* initialization to perform when the nfsd service is started: */
7174 nfs4_state_start(void)
7178 ret = set_callback_cred();
7182 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7183 if (laundry_wq == NULL) {
7185 goto out_cleanup_cred;
7187 ret = nfsd4_create_callback_queue();
7189 goto out_free_laundry;
7191 set_max_delegations();
7195 destroy_workqueue(laundry_wq);
7197 cleanup_callback_cred();
7202 nfs4_state_shutdown_net(struct net *net)
7204 struct nfs4_delegation *dp = NULL;
7205 struct list_head *pos, *next, reaplist;
7206 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7207 struct nfsd4_blocked_lock *nbl;
7209 cancel_delayed_work_sync(&nn->laundromat_work);
7210 locks_end_grace(&nn->nfsd4_manager);
7212 INIT_LIST_HEAD(&reaplist);
7213 spin_lock(&state_lock);
7214 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7215 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7216 WARN_ON(!unhash_delegation_locked(dp));
7217 list_add(&dp->dl_recall_lru, &reaplist);
7219 spin_unlock(&state_lock);
7220 list_for_each_safe(pos, next, &reaplist) {
7221 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7222 list_del_init(&dp->dl_recall_lru);
7223 put_clnt_odstate(dp->dl_clnt_odstate);
7224 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
7225 nfs4_put_stid(&dp->dl_stid);
7228 BUG_ON(!list_empty(&reaplist));
7229 spin_lock(&nn->blocked_locks_lock);
7230 while (!list_empty(&nn->blocked_locks_lru)) {
7231 nbl = list_first_entry(&nn->blocked_locks_lru,
7232 struct nfsd4_blocked_lock, nbl_lru);
7233 list_move(&nbl->nbl_lru, &reaplist);
7234 list_del_init(&nbl->nbl_list);
7236 spin_unlock(&nn->blocked_locks_lock);
7238 while (!list_empty(&reaplist)) {
7239 nbl = list_first_entry(&nn->blocked_locks_lru,
7240 struct nfsd4_blocked_lock, nbl_lru);
7241 list_del_init(&nbl->nbl_lru);
7242 posix_unblock_lock(&nbl->nbl_lock);
7243 free_blocked_lock(nbl);
7246 nfsd4_client_tracking_exit(net);
7247 nfs4_state_destroy_net(net);
7251 nfs4_state_shutdown(void)
7253 destroy_workqueue(laundry_wq);
7254 nfsd4_destroy_callback_queue();
7255 cleanup_callback_cred();
7259 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7261 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
7262 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7266 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7268 if (cstate->minorversion) {
7269 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7270 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7275 clear_current_stateid(struct nfsd4_compound_state *cstate)
7277 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7281 * functions to set current state id
7284 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7285 union nfsd4_op_u *u)
7287 put_stateid(cstate, &u->open_downgrade.od_stateid);
7291 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7292 union nfsd4_op_u *u)
7294 put_stateid(cstate, &u->open.op_stateid);
7298 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7299 union nfsd4_op_u *u)
7301 put_stateid(cstate, &u->close.cl_stateid);
7305 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7306 union nfsd4_op_u *u)
7308 put_stateid(cstate, &u->lock.lk_resp_stateid);
7312 * functions to consume current state id
7316 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
7317 union nfsd4_op_u *u)
7319 get_stateid(cstate, &u->open_downgrade.od_stateid);
7323 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
7324 union nfsd4_op_u *u)
7326 get_stateid(cstate, &u->delegreturn.dr_stateid);
7330 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
7331 union nfsd4_op_u *u)
7333 get_stateid(cstate, &u->free_stateid.fr_stateid);
7337 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
7338 union nfsd4_op_u *u)
7340 get_stateid(cstate, &u->setattr.sa_stateid);
7344 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
7345 union nfsd4_op_u *u)
7347 get_stateid(cstate, &u->close.cl_stateid);
7351 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
7352 union nfsd4_op_u *u)
7354 get_stateid(cstate, &u->locku.lu_stateid);
7358 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
7359 union nfsd4_op_u *u)
7361 get_stateid(cstate, &u->read.rd_stateid);
7365 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
7366 union nfsd4_op_u *u)
7368 get_stateid(cstate, &u->write.wr_stateid);