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
= {
67 static u64 current_sessionid
= 1;
69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
70 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
71 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
73 /* forward declarations */
74 static bool check_for_locks(struct nfs4_file
*fp
, struct nfs4_lockowner
*lowner
);
75 static void nfs4_free_ol_stateid(struct nfs4_stid
*stid
);
80 * Currently used for the del_recall_lru and file hash table. In an
81 * effort to decrease the scope of the client_mutex, this spinlock may
82 * eventually cover more:
84 static DEFINE_SPINLOCK(state_lock
);
87 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
88 * the refcount on the open stateid to drop.
90 static DECLARE_WAIT_QUEUE_HEAD(close_wq
);
92 static struct kmem_cache
*openowner_slab
;
93 static struct kmem_cache
*lockowner_slab
;
94 static struct kmem_cache
*file_slab
;
95 static struct kmem_cache
*stateid_slab
;
96 static struct kmem_cache
*deleg_slab
;
97 static struct kmem_cache
*odstate_slab
;
99 static void free_session(struct nfsd4_session
*);
101 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops
;
103 static bool is_session_dead(struct nfsd4_session
*ses
)
105 return ses
->se_flags
& NFS4_SESSION_DEAD
;
108 static __be32
mark_session_dead_locked(struct nfsd4_session
*ses
, int ref_held_by_me
)
110 if (atomic_read(&ses
->se_ref
) > ref_held_by_me
)
111 return nfserr_jukebox
;
112 ses
->se_flags
|= NFS4_SESSION_DEAD
;
116 static bool is_client_expired(struct nfs4_client
*clp
)
118 return clp
->cl_time
== 0;
121 static __be32
get_client_locked(struct nfs4_client
*clp
)
123 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
125 lockdep_assert_held(&nn
->client_lock
);
127 if (is_client_expired(clp
))
128 return nfserr_expired
;
129 atomic_inc(&clp
->cl_refcount
);
133 /* must be called under the client_lock */
135 renew_client_locked(struct nfs4_client
*clp
)
137 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
139 if (is_client_expired(clp
)) {
141 printk("%s: client (clientid %08x/%08x) already expired\n",
143 clp
->cl_clientid
.cl_boot
,
144 clp
->cl_clientid
.cl_id
);
148 dprintk("renewing client (clientid %08x/%08x)\n",
149 clp
->cl_clientid
.cl_boot
,
150 clp
->cl_clientid
.cl_id
);
151 list_move_tail(&clp
->cl_lru
, &nn
->client_lru
);
152 clp
->cl_time
= get_seconds();
155 static void put_client_renew_locked(struct nfs4_client
*clp
)
157 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
159 lockdep_assert_held(&nn
->client_lock
);
161 if (!atomic_dec_and_test(&clp
->cl_refcount
))
163 if (!is_client_expired(clp
))
164 renew_client_locked(clp
);
167 static void put_client_renew(struct nfs4_client
*clp
)
169 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
171 if (!atomic_dec_and_lock(&clp
->cl_refcount
, &nn
->client_lock
))
173 if (!is_client_expired(clp
))
174 renew_client_locked(clp
);
175 spin_unlock(&nn
->client_lock
);
178 static __be32
nfsd4_get_session_locked(struct nfsd4_session
*ses
)
182 if (is_session_dead(ses
))
183 return nfserr_badsession
;
184 status
= get_client_locked(ses
->se_client
);
187 atomic_inc(&ses
->se_ref
);
191 static void nfsd4_put_session_locked(struct nfsd4_session
*ses
)
193 struct nfs4_client
*clp
= ses
->se_client
;
194 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
196 lockdep_assert_held(&nn
->client_lock
);
198 if (atomic_dec_and_test(&ses
->se_ref
) && is_session_dead(ses
))
200 put_client_renew_locked(clp
);
203 static void nfsd4_put_session(struct nfsd4_session
*ses
)
205 struct nfs4_client
*clp
= ses
->se_client
;
206 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
208 spin_lock(&nn
->client_lock
);
209 nfsd4_put_session_locked(ses
);
210 spin_unlock(&nn
->client_lock
);
213 static inline struct nfs4_stateowner
*
214 nfs4_get_stateowner(struct nfs4_stateowner
*sop
)
216 atomic_inc(&sop
->so_count
);
221 same_owner_str(struct nfs4_stateowner
*sop
, struct xdr_netobj
*owner
)
223 return (sop
->so_owner
.len
== owner
->len
) &&
224 0 == memcmp(sop
->so_owner
.data
, owner
->data
, owner
->len
);
227 static struct nfs4_openowner
*
228 find_openstateowner_str_locked(unsigned int hashval
, struct nfsd4_open
*open
,
229 struct nfs4_client
*clp
)
231 struct nfs4_stateowner
*so
;
233 lockdep_assert_held(&clp
->cl_lock
);
235 list_for_each_entry(so
, &clp
->cl_ownerstr_hashtbl
[hashval
],
237 if (!so
->so_is_open_owner
)
239 if (same_owner_str(so
, &open
->op_owner
))
240 return openowner(nfs4_get_stateowner(so
));
245 static struct nfs4_openowner
*
246 find_openstateowner_str(unsigned int hashval
, struct nfsd4_open
*open
,
247 struct nfs4_client
*clp
)
249 struct nfs4_openowner
*oo
;
251 spin_lock(&clp
->cl_lock
);
252 oo
= find_openstateowner_str_locked(hashval
, open
, clp
);
253 spin_unlock(&clp
->cl_lock
);
258 opaque_hashval(const void *ptr
, int nbytes
)
260 unsigned char *cptr
= (unsigned char *) ptr
;
270 static void nfsd4_free_file_rcu(struct rcu_head
*rcu
)
272 struct nfs4_file
*fp
= container_of(rcu
, struct nfs4_file
, fi_rcu
);
274 kmem_cache_free(file_slab
, fp
);
278 put_nfs4_file(struct nfs4_file
*fi
)
280 might_lock(&state_lock
);
282 if (atomic_dec_and_lock(&fi
->fi_ref
, &state_lock
)) {
283 hlist_del_rcu(&fi
->fi_hash
);
284 spin_unlock(&state_lock
);
285 WARN_ON_ONCE(!list_empty(&fi
->fi_clnt_odstate
));
286 WARN_ON_ONCE(!list_empty(&fi
->fi_delegations
));
287 call_rcu(&fi
->fi_rcu
, nfsd4_free_file_rcu
);
292 __nfs4_get_fd(struct nfs4_file
*f
, int oflag
)
294 if (f
->fi_fds
[oflag
])
295 return get_file(f
->fi_fds
[oflag
]);
300 find_writeable_file_locked(struct nfs4_file
*f
)
304 lockdep_assert_held(&f
->fi_lock
);
306 ret
= __nfs4_get_fd(f
, O_WRONLY
);
308 ret
= __nfs4_get_fd(f
, O_RDWR
);
313 find_writeable_file(struct nfs4_file
*f
)
317 spin_lock(&f
->fi_lock
);
318 ret
= find_writeable_file_locked(f
);
319 spin_unlock(&f
->fi_lock
);
324 static struct file
*find_readable_file_locked(struct nfs4_file
*f
)
328 lockdep_assert_held(&f
->fi_lock
);
330 ret
= __nfs4_get_fd(f
, O_RDONLY
);
332 ret
= __nfs4_get_fd(f
, O_RDWR
);
337 find_readable_file(struct nfs4_file
*f
)
341 spin_lock(&f
->fi_lock
);
342 ret
= find_readable_file_locked(f
);
343 spin_unlock(&f
->fi_lock
);
349 find_any_file(struct nfs4_file
*f
)
353 spin_lock(&f
->fi_lock
);
354 ret
= __nfs4_get_fd(f
, O_RDWR
);
356 ret
= __nfs4_get_fd(f
, O_WRONLY
);
358 ret
= __nfs4_get_fd(f
, O_RDONLY
);
360 spin_unlock(&f
->fi_lock
);
364 static atomic_long_t num_delegations
;
365 unsigned long max_delegations
;
368 * Open owner state (share locks)
371 /* hash tables for lock and open owners */
372 #define OWNER_HASH_BITS 8
373 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
374 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
376 static unsigned int ownerstr_hashval(struct xdr_netobj
*ownername
)
380 ret
= opaque_hashval(ownername
->data
, ownername
->len
);
381 return ret
& OWNER_HASH_MASK
;
384 /* hash table for nfs4_file */
385 #define FILE_HASH_BITS 8
386 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
388 static unsigned int nfsd_fh_hashval(struct knfsd_fh
*fh
)
390 return jhash2(fh
->fh_base
.fh_pad
, XDR_QUADLEN(fh
->fh_size
), 0);
393 static unsigned int file_hashval(struct knfsd_fh
*fh
)
395 return nfsd_fh_hashval(fh
) & (FILE_HASH_SIZE
- 1);
398 static struct hlist_head file_hashtbl
[FILE_HASH_SIZE
];
401 __nfs4_file_get_access(struct nfs4_file
*fp
, u32 access
)
403 lockdep_assert_held(&fp
->fi_lock
);
405 if (access
& NFS4_SHARE_ACCESS_WRITE
)
406 atomic_inc(&fp
->fi_access
[O_WRONLY
]);
407 if (access
& NFS4_SHARE_ACCESS_READ
)
408 atomic_inc(&fp
->fi_access
[O_RDONLY
]);
412 nfs4_file_get_access(struct nfs4_file
*fp
, u32 access
)
414 lockdep_assert_held(&fp
->fi_lock
);
416 /* Does this access mode make sense? */
417 if (access
& ~NFS4_SHARE_ACCESS_BOTH
)
420 /* Does it conflict with a deny mode already set? */
421 if ((access
& fp
->fi_share_deny
) != 0)
422 return nfserr_share_denied
;
424 __nfs4_file_get_access(fp
, access
);
428 static __be32
nfs4_file_check_deny(struct nfs4_file
*fp
, u32 deny
)
430 /* Common case is that there is no deny mode. */
432 /* Does this deny mode make sense? */
433 if (deny
& ~NFS4_SHARE_DENY_BOTH
)
436 if ((deny
& NFS4_SHARE_DENY_READ
) &&
437 atomic_read(&fp
->fi_access
[O_RDONLY
]))
438 return nfserr_share_denied
;
440 if ((deny
& NFS4_SHARE_DENY_WRITE
) &&
441 atomic_read(&fp
->fi_access
[O_WRONLY
]))
442 return nfserr_share_denied
;
447 static void __nfs4_file_put_access(struct nfs4_file
*fp
, int oflag
)
449 might_lock(&fp
->fi_lock
);
451 if (atomic_dec_and_lock(&fp
->fi_access
[oflag
], &fp
->fi_lock
)) {
452 struct file
*f1
= NULL
;
453 struct file
*f2
= NULL
;
455 swap(f1
, fp
->fi_fds
[oflag
]);
456 if (atomic_read(&fp
->fi_access
[1 - oflag
]) == 0)
457 swap(f2
, fp
->fi_fds
[O_RDWR
]);
458 spin_unlock(&fp
->fi_lock
);
466 static void nfs4_file_put_access(struct nfs4_file
*fp
, u32 access
)
468 WARN_ON_ONCE(access
& ~NFS4_SHARE_ACCESS_BOTH
);
470 if (access
& NFS4_SHARE_ACCESS_WRITE
)
471 __nfs4_file_put_access(fp
, O_WRONLY
);
472 if (access
& NFS4_SHARE_ACCESS_READ
)
473 __nfs4_file_put_access(fp
, O_RDONLY
);
477 * Allocate a new open/delegation state counter. This is needed for
478 * pNFS for proper return on close semantics.
480 * Note that we only allocate it for pNFS-enabled exports, otherwise
481 * all pointers to struct nfs4_clnt_odstate are always NULL.
483 static struct nfs4_clnt_odstate
*
484 alloc_clnt_odstate(struct nfs4_client
*clp
)
486 struct nfs4_clnt_odstate
*co
;
488 co
= kmem_cache_zalloc(odstate_slab
, GFP_KERNEL
);
491 atomic_set(&co
->co_odcount
, 1);
497 hash_clnt_odstate_locked(struct nfs4_clnt_odstate
*co
)
499 struct nfs4_file
*fp
= co
->co_file
;
501 lockdep_assert_held(&fp
->fi_lock
);
502 list_add(&co
->co_perfile
, &fp
->fi_clnt_odstate
);
506 get_clnt_odstate(struct nfs4_clnt_odstate
*co
)
509 atomic_inc(&co
->co_odcount
);
513 put_clnt_odstate(struct nfs4_clnt_odstate
*co
)
515 struct nfs4_file
*fp
;
521 if (atomic_dec_and_lock(&co
->co_odcount
, &fp
->fi_lock
)) {
522 list_del(&co
->co_perfile
);
523 spin_unlock(&fp
->fi_lock
);
525 nfsd4_return_all_file_layouts(co
->co_client
, fp
);
526 kmem_cache_free(odstate_slab
, co
);
530 static struct nfs4_clnt_odstate
*
531 find_or_hash_clnt_odstate(struct nfs4_file
*fp
, struct nfs4_clnt_odstate
*new)
533 struct nfs4_clnt_odstate
*co
;
534 struct nfs4_client
*cl
;
541 spin_lock(&fp
->fi_lock
);
542 list_for_each_entry(co
, &fp
->fi_clnt_odstate
, co_perfile
) {
543 if (co
->co_client
== cl
) {
544 get_clnt_odstate(co
);
550 hash_clnt_odstate_locked(new);
552 spin_unlock(&fp
->fi_lock
);
556 struct nfs4_stid
*nfs4_alloc_stid(struct nfs4_client
*cl
,
557 struct kmem_cache
*slab
)
559 struct nfs4_stid
*stid
;
562 stid
= kmem_cache_zalloc(slab
, GFP_KERNEL
);
566 idr_preload(GFP_KERNEL
);
567 spin_lock(&cl
->cl_lock
);
568 new_id
= idr_alloc_cyclic(&cl
->cl_stateids
, stid
, 0, 0, GFP_NOWAIT
);
569 spin_unlock(&cl
->cl_lock
);
573 stid
->sc_client
= cl
;
574 stid
->sc_stateid
.si_opaque
.so_id
= new_id
;
575 stid
->sc_stateid
.si_opaque
.so_clid
= cl
->cl_clientid
;
576 /* Will be incremented before return to client: */
577 atomic_set(&stid
->sc_count
, 1);
578 spin_lock_init(&stid
->sc_lock
);
581 * It shouldn't be a problem to reuse an opaque stateid value.
582 * I don't think it is for 4.1. But with 4.0 I worry that, for
583 * example, a stray write retransmission could be accepted by
584 * the server when it should have been rejected. Therefore,
585 * adopt a trick from the sctp code to attempt to maximize the
586 * amount of time until an id is reused, by ensuring they always
587 * "increase" (mod INT_MAX):
591 kmem_cache_free(slab
, stid
);
595 static struct nfs4_ol_stateid
* nfs4_alloc_open_stateid(struct nfs4_client
*clp
)
597 struct nfs4_stid
*stid
;
598 struct nfs4_ol_stateid
*stp
;
600 stid
= nfs4_alloc_stid(clp
, stateid_slab
);
604 stp
= openlockstateid(stid
);
605 stp
->st_stid
.sc_free
= nfs4_free_ol_stateid
;
609 static void nfs4_free_deleg(struct nfs4_stid
*stid
)
611 kmem_cache_free(deleg_slab
, stid
);
612 atomic_long_dec(&num_delegations
);
616 * When we recall a delegation, we should be careful not to hand it
617 * out again straight away.
618 * To ensure this we keep a pair of bloom filters ('new' and 'old')
619 * in which the filehandles of recalled delegations are "stored".
620 * If a filehandle appear in either filter, a delegation is blocked.
621 * When a delegation is recalled, the filehandle is stored in the "new"
623 * Every 30 seconds we swap the filters and clear the "new" one,
624 * unless both are empty of course.
626 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
627 * low 3 bytes as hash-table indices.
629 * 'blocked_delegations_lock', which is always taken in block_delegations(),
630 * is used to manage concurrent access. Testing does not need the lock
631 * except when swapping the two filters.
633 static DEFINE_SPINLOCK(blocked_delegations_lock
);
634 static struct bloom_pair
{
635 int entries
, old_entries
;
637 int new; /* index into 'set' */
638 DECLARE_BITMAP(set
[2], 256);
639 } blocked_delegations
;
641 static int delegation_blocked(struct knfsd_fh
*fh
)
644 struct bloom_pair
*bd
= &blocked_delegations
;
646 if (bd
->entries
== 0)
648 if (seconds_since_boot() - bd
->swap_time
> 30) {
649 spin_lock(&blocked_delegations_lock
);
650 if (seconds_since_boot() - bd
->swap_time
> 30) {
651 bd
->entries
-= bd
->old_entries
;
652 bd
->old_entries
= bd
->entries
;
653 memset(bd
->set
[bd
->new], 0,
656 bd
->swap_time
= seconds_since_boot();
658 spin_unlock(&blocked_delegations_lock
);
660 hash
= jhash(&fh
->fh_base
, fh
->fh_size
, 0);
661 if (test_bit(hash
&255, bd
->set
[0]) &&
662 test_bit((hash
>>8)&255, bd
->set
[0]) &&
663 test_bit((hash
>>16)&255, bd
->set
[0]))
666 if (test_bit(hash
&255, bd
->set
[1]) &&
667 test_bit((hash
>>8)&255, bd
->set
[1]) &&
668 test_bit((hash
>>16)&255, bd
->set
[1]))
674 static void block_delegations(struct knfsd_fh
*fh
)
677 struct bloom_pair
*bd
= &blocked_delegations
;
679 hash
= jhash(&fh
->fh_base
, fh
->fh_size
, 0);
681 spin_lock(&blocked_delegations_lock
);
682 __set_bit(hash
&255, bd
->set
[bd
->new]);
683 __set_bit((hash
>>8)&255, bd
->set
[bd
->new]);
684 __set_bit((hash
>>16)&255, bd
->set
[bd
->new]);
685 if (bd
->entries
== 0)
686 bd
->swap_time
= seconds_since_boot();
688 spin_unlock(&blocked_delegations_lock
);
691 static struct nfs4_delegation
*
692 alloc_init_deleg(struct nfs4_client
*clp
, struct svc_fh
*current_fh
,
693 struct nfs4_clnt_odstate
*odstate
)
695 struct nfs4_delegation
*dp
;
698 dprintk("NFSD alloc_init_deleg\n");
699 n
= atomic_long_inc_return(&num_delegations
);
700 if (n
< 0 || n
> max_delegations
)
702 if (delegation_blocked(¤t_fh
->fh_handle
))
704 dp
= delegstateid(nfs4_alloc_stid(clp
, deleg_slab
));
708 dp
->dl_stid
.sc_free
= nfs4_free_deleg
;
710 * delegation seqid's are never incremented. The 4.1 special
711 * meaning of seqid 0 isn't meaningful, really, but let's avoid
712 * 0 anyway just for consistency and use 1:
714 dp
->dl_stid
.sc_stateid
.si_generation
= 1;
715 INIT_LIST_HEAD(&dp
->dl_perfile
);
716 INIT_LIST_HEAD(&dp
->dl_perclnt
);
717 INIT_LIST_HEAD(&dp
->dl_recall_lru
);
718 dp
->dl_clnt_odstate
= odstate
;
719 get_clnt_odstate(odstate
);
720 dp
->dl_type
= NFS4_OPEN_DELEGATE_READ
;
722 nfsd4_init_cb(&dp
->dl_recall
, dp
->dl_stid
.sc_client
,
723 &nfsd4_cb_recall_ops
, NFSPROC4_CLNT_CB_RECALL
);
726 atomic_long_dec(&num_delegations
);
731 nfs4_put_stid(struct nfs4_stid
*s
)
733 struct nfs4_file
*fp
= s
->sc_file
;
734 struct nfs4_client
*clp
= s
->sc_client
;
736 might_lock(&clp
->cl_lock
);
738 if (!atomic_dec_and_lock(&s
->sc_count
, &clp
->cl_lock
)) {
739 wake_up_all(&close_wq
);
742 idr_remove(&clp
->cl_stateids
, s
->sc_stateid
.si_opaque
.so_id
);
743 spin_unlock(&clp
->cl_lock
);
750 nfs4_inc_and_copy_stateid(stateid_t
*dst
, struct nfs4_stid
*stid
)
752 stateid_t
*src
= &stid
->sc_stateid
;
754 spin_lock(&stid
->sc_lock
);
755 if (unlikely(++src
->si_generation
== 0))
756 src
->si_generation
= 1;
757 memcpy(dst
, src
, sizeof(*dst
));
758 spin_unlock(&stid
->sc_lock
);
761 static void nfs4_put_deleg_lease(struct nfs4_file
*fp
)
763 struct file
*filp
= NULL
;
765 spin_lock(&fp
->fi_lock
);
766 if (fp
->fi_deleg_file
&& --fp
->fi_delegees
== 0)
767 swap(filp
, fp
->fi_deleg_file
);
768 spin_unlock(&fp
->fi_lock
);
771 vfs_setlease(filp
, F_UNLCK
, NULL
, (void **)&fp
);
776 void nfs4_unhash_stid(struct nfs4_stid
*s
)
782 * nfs4_get_existing_delegation - Discover if this delegation already exists
783 * @clp: a pointer to the nfs4_client we're granting a delegation to
784 * @fp: a pointer to the nfs4_file we're granting a delegation on
787 * On success: NULL if an existing delegation was not found.
789 * On error: -EAGAIN if one was previously granted to this nfs4_client
790 * for this nfs4_file.
795 nfs4_get_existing_delegation(struct nfs4_client
*clp
, struct nfs4_file
*fp
)
797 struct nfs4_delegation
*searchdp
= NULL
;
798 struct nfs4_client
*searchclp
= NULL
;
800 lockdep_assert_held(&state_lock
);
801 lockdep_assert_held(&fp
->fi_lock
);
803 list_for_each_entry(searchdp
, &fp
->fi_delegations
, dl_perfile
) {
804 searchclp
= searchdp
->dl_stid
.sc_client
;
805 if (clp
== searchclp
) {
813 * hash_delegation_locked - Add a delegation to the appropriate lists
814 * @dp: a pointer to the nfs4_delegation we are adding.
815 * @fp: a pointer to the nfs4_file we're granting a delegation on
818 * On success: NULL if the delegation was successfully hashed.
820 * On error: -EAGAIN if one was previously granted to this
821 * nfs4_client for this nfs4_file. Delegation is not hashed.
826 hash_delegation_locked(struct nfs4_delegation
*dp
, struct nfs4_file
*fp
)
829 struct nfs4_client
*clp
= dp
->dl_stid
.sc_client
;
831 lockdep_assert_held(&state_lock
);
832 lockdep_assert_held(&fp
->fi_lock
);
834 status
= nfs4_get_existing_delegation(clp
, fp
);
838 atomic_inc(&dp
->dl_stid
.sc_count
);
839 dp
->dl_stid
.sc_type
= NFS4_DELEG_STID
;
840 list_add(&dp
->dl_perfile
, &fp
->fi_delegations
);
841 list_add(&dp
->dl_perclnt
, &clp
->cl_delegations
);
846 unhash_delegation_locked(struct nfs4_delegation
*dp
)
848 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
850 lockdep_assert_held(&state_lock
);
852 if (list_empty(&dp
->dl_perfile
))
855 dp
->dl_stid
.sc_type
= NFS4_CLOSED_DELEG_STID
;
856 /* Ensure that deleg break won't try to requeue it */
858 spin_lock(&fp
->fi_lock
);
859 list_del_init(&dp
->dl_perclnt
);
860 list_del_init(&dp
->dl_recall_lru
);
861 list_del_init(&dp
->dl_perfile
);
862 spin_unlock(&fp
->fi_lock
);
866 static void destroy_delegation(struct nfs4_delegation
*dp
)
870 spin_lock(&state_lock
);
871 unhashed
= unhash_delegation_locked(dp
);
872 spin_unlock(&state_lock
);
874 put_clnt_odstate(dp
->dl_clnt_odstate
);
875 nfs4_put_deleg_lease(dp
->dl_stid
.sc_file
);
876 nfs4_put_stid(&dp
->dl_stid
);
880 static void revoke_delegation(struct nfs4_delegation
*dp
)
882 struct nfs4_client
*clp
= dp
->dl_stid
.sc_client
;
884 WARN_ON(!list_empty(&dp
->dl_recall_lru
));
886 put_clnt_odstate(dp
->dl_clnt_odstate
);
887 nfs4_put_deleg_lease(dp
->dl_stid
.sc_file
);
889 if (clp
->cl_minorversion
== 0)
890 nfs4_put_stid(&dp
->dl_stid
);
892 dp
->dl_stid
.sc_type
= NFS4_REVOKED_DELEG_STID
;
893 spin_lock(&clp
->cl_lock
);
894 list_add(&dp
->dl_recall_lru
, &clp
->cl_revoked
);
895 spin_unlock(&clp
->cl_lock
);
903 static unsigned int clientid_hashval(u32 id
)
905 return id
& CLIENT_HASH_MASK
;
908 static unsigned int clientstr_hashval(const char *name
)
910 return opaque_hashval(name
, 8) & CLIENT_HASH_MASK
;
914 * We store the NONE, READ, WRITE, and BOTH bits separately in the
915 * st_{access,deny}_bmap field of the stateid, in order to track not
916 * only what share bits are currently in force, but also what
917 * combinations of share bits previous opens have used. This allows us
918 * to enforce the recommendation of rfc 3530 14.2.19 that the server
919 * return an error if the client attempt to downgrade to a combination
920 * of share bits not explicable by closing some of its previous opens.
922 * XXX: This enforcement is actually incomplete, since we don't keep
923 * track of access/deny bit combinations; so, e.g., we allow:
925 * OPEN allow read, deny write
926 * OPEN allow both, deny none
927 * DOWNGRADE allow read, deny none
929 * which we should reject.
932 bmap_to_share_mode(unsigned long bmap
) {
934 unsigned int access
= 0;
936 for (i
= 1; i
< 4; i
++) {
937 if (test_bit(i
, &bmap
))
943 /* set share access for a given stateid */
945 set_access(u32 access
, struct nfs4_ol_stateid
*stp
)
947 unsigned char mask
= 1 << access
;
949 WARN_ON_ONCE(access
> NFS4_SHARE_ACCESS_BOTH
);
950 stp
->st_access_bmap
|= mask
;
953 /* clear share access for a given stateid */
955 clear_access(u32 access
, struct nfs4_ol_stateid
*stp
)
957 unsigned char mask
= 1 << access
;
959 WARN_ON_ONCE(access
> NFS4_SHARE_ACCESS_BOTH
);
960 stp
->st_access_bmap
&= ~mask
;
963 /* test whether a given stateid has access */
965 test_access(u32 access
, struct nfs4_ol_stateid
*stp
)
967 unsigned char mask
= 1 << access
;
969 return (bool)(stp
->st_access_bmap
& mask
);
972 /* set share deny for a given stateid */
974 set_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
976 unsigned char mask
= 1 << deny
;
978 WARN_ON_ONCE(deny
> NFS4_SHARE_DENY_BOTH
);
979 stp
->st_deny_bmap
|= mask
;
982 /* clear share deny for a given stateid */
984 clear_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
986 unsigned char mask
= 1 << deny
;
988 WARN_ON_ONCE(deny
> NFS4_SHARE_DENY_BOTH
);
989 stp
->st_deny_bmap
&= ~mask
;
992 /* test whether a given stateid is denying specific access */
994 test_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
996 unsigned char mask
= 1 << deny
;
998 return (bool)(stp
->st_deny_bmap
& mask
);
1001 static int nfs4_access_to_omode(u32 access
)
1003 switch (access
& NFS4_SHARE_ACCESS_BOTH
) {
1004 case NFS4_SHARE_ACCESS_READ
:
1006 case NFS4_SHARE_ACCESS_WRITE
:
1008 case NFS4_SHARE_ACCESS_BOTH
:
1016 * A stateid that had a deny mode associated with it is being released
1017 * or downgraded. Recalculate the deny mode on the file.
1020 recalculate_deny_mode(struct nfs4_file
*fp
)
1022 struct nfs4_ol_stateid
*stp
;
1024 spin_lock(&fp
->fi_lock
);
1025 fp
->fi_share_deny
= 0;
1026 list_for_each_entry(stp
, &fp
->fi_stateids
, st_perfile
)
1027 fp
->fi_share_deny
|= bmap_to_share_mode(stp
->st_deny_bmap
);
1028 spin_unlock(&fp
->fi_lock
);
1032 reset_union_bmap_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
1035 bool change
= false;
1037 for (i
= 1; i
< 4; i
++) {
1038 if ((i
& deny
) != i
) {
1044 /* Recalculate per-file deny mode if there was a change */
1046 recalculate_deny_mode(stp
->st_stid
.sc_file
);
1049 /* release all access and file references for a given stateid */
1051 release_all_access(struct nfs4_ol_stateid
*stp
)
1054 struct nfs4_file
*fp
= stp
->st_stid
.sc_file
;
1056 if (fp
&& stp
->st_deny_bmap
!= 0)
1057 recalculate_deny_mode(fp
);
1059 for (i
= 1; i
< 4; i
++) {
1060 if (test_access(i
, stp
))
1061 nfs4_file_put_access(stp
->st_stid
.sc_file
, i
);
1062 clear_access(i
, stp
);
1066 static inline void nfs4_free_stateowner(struct nfs4_stateowner
*sop
)
1068 kfree(sop
->so_owner
.data
);
1069 sop
->so_ops
->so_free(sop
);
1072 static void nfs4_put_stateowner(struct nfs4_stateowner
*sop
)
1074 struct nfs4_client
*clp
= sop
->so_client
;
1076 might_lock(&clp
->cl_lock
);
1078 if (!atomic_dec_and_lock(&sop
->so_count
, &clp
->cl_lock
))
1080 sop
->so_ops
->so_unhash(sop
);
1081 spin_unlock(&clp
->cl_lock
);
1082 nfs4_free_stateowner(sop
);
1085 static bool unhash_ol_stateid(struct nfs4_ol_stateid
*stp
)
1087 struct nfs4_file
*fp
= stp
->st_stid
.sc_file
;
1089 lockdep_assert_held(&stp
->st_stateowner
->so_client
->cl_lock
);
1091 if (list_empty(&stp
->st_perfile
))
1094 spin_lock(&fp
->fi_lock
);
1095 list_del_init(&stp
->st_perfile
);
1096 spin_unlock(&fp
->fi_lock
);
1097 list_del(&stp
->st_perstateowner
);
1101 static void nfs4_free_ol_stateid(struct nfs4_stid
*stid
)
1103 struct nfs4_ol_stateid
*stp
= openlockstateid(stid
);
1105 put_clnt_odstate(stp
->st_clnt_odstate
);
1106 release_all_access(stp
);
1107 if (stp
->st_stateowner
)
1108 nfs4_put_stateowner(stp
->st_stateowner
);
1109 kmem_cache_free(stateid_slab
, stid
);
1112 static void nfs4_free_lock_stateid(struct nfs4_stid
*stid
)
1114 struct nfs4_ol_stateid
*stp
= openlockstateid(stid
);
1115 struct nfs4_lockowner
*lo
= lockowner(stp
->st_stateowner
);
1118 file
= find_any_file(stp
->st_stid
.sc_file
);
1120 filp_close(file
, (fl_owner_t
)lo
);
1121 nfs4_free_ol_stateid(stid
);
1125 * Put the persistent reference to an already unhashed generic stateid, while
1126 * holding the cl_lock. If it's the last reference, then put it onto the
1127 * reaplist for later destruction.
1129 static void put_ol_stateid_locked(struct nfs4_ol_stateid
*stp
,
1130 struct list_head
*reaplist
)
1132 struct nfs4_stid
*s
= &stp
->st_stid
;
1133 struct nfs4_client
*clp
= s
->sc_client
;
1135 lockdep_assert_held(&clp
->cl_lock
);
1137 WARN_ON_ONCE(!list_empty(&stp
->st_locks
));
1139 if (!atomic_dec_and_test(&s
->sc_count
)) {
1140 wake_up_all(&close_wq
);
1144 idr_remove(&clp
->cl_stateids
, s
->sc_stateid
.si_opaque
.so_id
);
1145 list_add(&stp
->st_locks
, reaplist
);
1148 static bool unhash_lock_stateid(struct nfs4_ol_stateid
*stp
)
1150 struct nfs4_openowner
*oo
= openowner(stp
->st_openstp
->st_stateowner
);
1152 lockdep_assert_held(&oo
->oo_owner
.so_client
->cl_lock
);
1154 list_del_init(&stp
->st_locks
);
1155 nfs4_unhash_stid(&stp
->st_stid
);
1156 return unhash_ol_stateid(stp
);
1159 static void release_lock_stateid(struct nfs4_ol_stateid
*stp
)
1161 struct nfs4_openowner
*oo
= openowner(stp
->st_openstp
->st_stateowner
);
1164 spin_lock(&oo
->oo_owner
.so_client
->cl_lock
);
1165 unhashed
= unhash_lock_stateid(stp
);
1166 spin_unlock(&oo
->oo_owner
.so_client
->cl_lock
);
1168 nfs4_put_stid(&stp
->st_stid
);
1171 static void unhash_lockowner_locked(struct nfs4_lockowner
*lo
)
1173 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
1175 lockdep_assert_held(&clp
->cl_lock
);
1177 list_del_init(&lo
->lo_owner
.so_strhash
);
1181 * Free a list of generic stateids that were collected earlier after being
1185 free_ol_stateid_reaplist(struct list_head
*reaplist
)
1187 struct nfs4_ol_stateid
*stp
;
1188 struct nfs4_file
*fp
;
1192 while (!list_empty(reaplist
)) {
1193 stp
= list_first_entry(reaplist
, struct nfs4_ol_stateid
,
1195 list_del(&stp
->st_locks
);
1196 fp
= stp
->st_stid
.sc_file
;
1197 stp
->st_stid
.sc_free(&stp
->st_stid
);
1203 static void release_lockowner(struct nfs4_lockowner
*lo
)
1205 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
1206 struct nfs4_ol_stateid
*stp
;
1207 struct list_head reaplist
;
1209 INIT_LIST_HEAD(&reaplist
);
1211 spin_lock(&clp
->cl_lock
);
1212 unhash_lockowner_locked(lo
);
1213 while (!list_empty(&lo
->lo_owner
.so_stateids
)) {
1214 stp
= list_first_entry(&lo
->lo_owner
.so_stateids
,
1215 struct nfs4_ol_stateid
, st_perstateowner
);
1216 WARN_ON(!unhash_lock_stateid(stp
));
1217 put_ol_stateid_locked(stp
, &reaplist
);
1219 spin_unlock(&clp
->cl_lock
);
1220 free_ol_stateid_reaplist(&reaplist
);
1221 nfs4_put_stateowner(&lo
->lo_owner
);
1224 static void release_open_stateid_locks(struct nfs4_ol_stateid
*open_stp
,
1225 struct list_head
*reaplist
)
1227 struct nfs4_ol_stateid
*stp
;
1229 lockdep_assert_held(&open_stp
->st_stid
.sc_client
->cl_lock
);
1231 while (!list_empty(&open_stp
->st_locks
)) {
1232 stp
= list_entry(open_stp
->st_locks
.next
,
1233 struct nfs4_ol_stateid
, st_locks
);
1234 WARN_ON(!unhash_lock_stateid(stp
));
1235 put_ol_stateid_locked(stp
, reaplist
);
1239 static bool unhash_open_stateid(struct nfs4_ol_stateid
*stp
,
1240 struct list_head
*reaplist
)
1244 lockdep_assert_held(&stp
->st_stid
.sc_client
->cl_lock
);
1246 unhashed
= unhash_ol_stateid(stp
);
1247 release_open_stateid_locks(stp
, reaplist
);
1251 static void release_open_stateid(struct nfs4_ol_stateid
*stp
)
1253 LIST_HEAD(reaplist
);
1255 spin_lock(&stp
->st_stid
.sc_client
->cl_lock
);
1256 if (unhash_open_stateid(stp
, &reaplist
))
1257 put_ol_stateid_locked(stp
, &reaplist
);
1258 spin_unlock(&stp
->st_stid
.sc_client
->cl_lock
);
1259 free_ol_stateid_reaplist(&reaplist
);
1262 static void unhash_openowner_locked(struct nfs4_openowner
*oo
)
1264 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
1266 lockdep_assert_held(&clp
->cl_lock
);
1268 list_del_init(&oo
->oo_owner
.so_strhash
);
1269 list_del_init(&oo
->oo_perclient
);
1272 static void release_last_closed_stateid(struct nfs4_openowner
*oo
)
1274 struct nfsd_net
*nn
= net_generic(oo
->oo_owner
.so_client
->net
,
1276 struct nfs4_ol_stateid
*s
;
1278 spin_lock(&nn
->client_lock
);
1279 s
= oo
->oo_last_closed_stid
;
1281 list_del_init(&oo
->oo_close_lru
);
1282 oo
->oo_last_closed_stid
= NULL
;
1284 spin_unlock(&nn
->client_lock
);
1286 nfs4_put_stid(&s
->st_stid
);
1289 static void release_openowner(struct nfs4_openowner
*oo
)
1291 struct nfs4_ol_stateid
*stp
;
1292 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
1293 struct list_head reaplist
;
1295 INIT_LIST_HEAD(&reaplist
);
1297 spin_lock(&clp
->cl_lock
);
1298 unhash_openowner_locked(oo
);
1299 while (!list_empty(&oo
->oo_owner
.so_stateids
)) {
1300 stp
= list_first_entry(&oo
->oo_owner
.so_stateids
,
1301 struct nfs4_ol_stateid
, st_perstateowner
);
1302 if (unhash_open_stateid(stp
, &reaplist
))
1303 put_ol_stateid_locked(stp
, &reaplist
);
1305 spin_unlock(&clp
->cl_lock
);
1306 free_ol_stateid_reaplist(&reaplist
);
1307 release_last_closed_stateid(oo
);
1308 nfs4_put_stateowner(&oo
->oo_owner
);
1312 hash_sessionid(struct nfs4_sessionid
*sessionid
)
1314 struct nfsd4_sessionid
*sid
= (struct nfsd4_sessionid
*)sessionid
;
1316 return sid
->sequence
% SESSION_HASH_SIZE
;
1319 #ifdef CONFIG_SUNRPC_DEBUG
1321 dump_sessionid(const char *fn
, struct nfs4_sessionid
*sessionid
)
1323 u32
*ptr
= (u32
*)(&sessionid
->data
[0]);
1324 dprintk("%s: %u:%u:%u:%u\n", fn
, ptr
[0], ptr
[1], ptr
[2], ptr
[3]);
1328 dump_sessionid(const char *fn
, struct nfs4_sessionid
*sessionid
)
1334 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1335 * won't be used for replay.
1337 void nfsd4_bump_seqid(struct nfsd4_compound_state
*cstate
, __be32 nfserr
)
1339 struct nfs4_stateowner
*so
= cstate
->replay_owner
;
1341 if (nfserr
== nfserr_replay_me
)
1344 if (!seqid_mutating_err(ntohl(nfserr
))) {
1345 nfsd4_cstate_clear_replay(cstate
);
1350 if (so
->so_is_open_owner
)
1351 release_last_closed_stateid(openowner(so
));
1357 gen_sessionid(struct nfsd4_session
*ses
)
1359 struct nfs4_client
*clp
= ses
->se_client
;
1360 struct nfsd4_sessionid
*sid
;
1362 sid
= (struct nfsd4_sessionid
*)ses
->se_sessionid
.data
;
1363 sid
->clientid
= clp
->cl_clientid
;
1364 sid
->sequence
= current_sessionid
++;
1369 * The protocol defines ca_maxresponssize_cached to include the size of
1370 * the rpc header, but all we need to cache is the data starting after
1371 * the end of the initial SEQUENCE operation--the rest we regenerate
1372 * each time. Therefore we can advertise a ca_maxresponssize_cached
1373 * value that is the number of bytes in our cache plus a few additional
1374 * bytes. In order to stay on the safe side, and not promise more than
1375 * we can cache, those additional bytes must be the minimum possible: 24
1376 * bytes of rpc header (xid through accept state, with AUTH_NULL
1377 * verifier), 12 for the compound header (with zero-length tag), and 44
1378 * for the SEQUENCE op response:
1380 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1383 free_session_slots(struct nfsd4_session
*ses
)
1387 for (i
= 0; i
< ses
->se_fchannel
.maxreqs
; i
++)
1388 kfree(ses
->se_slots
[i
]);
1392 * We don't actually need to cache the rpc and session headers, so we
1393 * can allocate a little less for each slot:
1395 static inline u32
slot_bytes(struct nfsd4_channel_attrs
*ca
)
1399 if (ca
->maxresp_cached
< NFSD_MIN_HDR_SEQ_SZ
)
1402 size
= ca
->maxresp_cached
- NFSD_MIN_HDR_SEQ_SZ
;
1403 return size
+ sizeof(struct nfsd4_slot
);
1407 * XXX: If we run out of reserved DRC memory we could (up to a point)
1408 * re-negotiate active sessions and reduce their slot usage to make
1409 * room for new connections. For now we just fail the create session.
1411 static u32
nfsd4_get_drc_mem(struct nfsd4_channel_attrs
*ca
)
1413 u32 slotsize
= slot_bytes(ca
);
1414 u32 num
= ca
->maxreqs
;
1417 spin_lock(&nfsd_drc_lock
);
1418 avail
= min((unsigned long)NFSD_MAX_MEM_PER_SESSION
,
1419 nfsd_drc_max_mem
- nfsd_drc_mem_used
);
1420 num
= min_t(int, num
, avail
/ slotsize
);
1421 nfsd_drc_mem_used
+= num
* slotsize
;
1422 spin_unlock(&nfsd_drc_lock
);
1427 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs
*ca
)
1429 int slotsize
= slot_bytes(ca
);
1431 spin_lock(&nfsd_drc_lock
);
1432 nfsd_drc_mem_used
-= slotsize
* ca
->maxreqs
;
1433 spin_unlock(&nfsd_drc_lock
);
1436 static struct nfsd4_session
*alloc_session(struct nfsd4_channel_attrs
*fattrs
,
1437 struct nfsd4_channel_attrs
*battrs
)
1439 int numslots
= fattrs
->maxreqs
;
1440 int slotsize
= slot_bytes(fattrs
);
1441 struct nfsd4_session
*new;
1444 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION
* sizeof(struct nfsd4_slot
*)
1445 + sizeof(struct nfsd4_session
) > PAGE_SIZE
);
1446 mem
= numslots
* sizeof(struct nfsd4_slot
*);
1448 new = kzalloc(sizeof(*new) + mem
, GFP_KERNEL
);
1451 /* allocate each struct nfsd4_slot and data cache in one piece */
1452 for (i
= 0; i
< numslots
; i
++) {
1453 new->se_slots
[i
] = kzalloc(slotsize
, GFP_KERNEL
);
1454 if (!new->se_slots
[i
])
1458 memcpy(&new->se_fchannel
, fattrs
, sizeof(struct nfsd4_channel_attrs
));
1459 memcpy(&new->se_bchannel
, battrs
, sizeof(struct nfsd4_channel_attrs
));
1464 kfree(new->se_slots
[i
]);
1469 static void free_conn(struct nfsd4_conn
*c
)
1471 svc_xprt_put(c
->cn_xprt
);
1475 static void nfsd4_conn_lost(struct svc_xpt_user
*u
)
1477 struct nfsd4_conn
*c
= container_of(u
, struct nfsd4_conn
, cn_xpt_user
);
1478 struct nfs4_client
*clp
= c
->cn_session
->se_client
;
1480 spin_lock(&clp
->cl_lock
);
1481 if (!list_empty(&c
->cn_persession
)) {
1482 list_del(&c
->cn_persession
);
1485 nfsd4_probe_callback(clp
);
1486 spin_unlock(&clp
->cl_lock
);
1489 static struct nfsd4_conn
*alloc_conn(struct svc_rqst
*rqstp
, u32 flags
)
1491 struct nfsd4_conn
*conn
;
1493 conn
= kmalloc(sizeof(struct nfsd4_conn
), GFP_KERNEL
);
1496 svc_xprt_get(rqstp
->rq_xprt
);
1497 conn
->cn_xprt
= rqstp
->rq_xprt
;
1498 conn
->cn_flags
= flags
;
1499 INIT_LIST_HEAD(&conn
->cn_xpt_user
.list
);
1503 static void __nfsd4_hash_conn(struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1505 conn
->cn_session
= ses
;
1506 list_add(&conn
->cn_persession
, &ses
->se_conns
);
1509 static void nfsd4_hash_conn(struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1511 struct nfs4_client
*clp
= ses
->se_client
;
1513 spin_lock(&clp
->cl_lock
);
1514 __nfsd4_hash_conn(conn
, ses
);
1515 spin_unlock(&clp
->cl_lock
);
1518 static int nfsd4_register_conn(struct nfsd4_conn
*conn
)
1520 conn
->cn_xpt_user
.callback
= nfsd4_conn_lost
;
1521 return register_xpt_user(conn
->cn_xprt
, &conn
->cn_xpt_user
);
1524 static void nfsd4_init_conn(struct svc_rqst
*rqstp
, struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1528 nfsd4_hash_conn(conn
, ses
);
1529 ret
= nfsd4_register_conn(conn
);
1531 /* oops; xprt is already down: */
1532 nfsd4_conn_lost(&conn
->cn_xpt_user
);
1533 /* We may have gained or lost a callback channel: */
1534 nfsd4_probe_callback_sync(ses
->se_client
);
1537 static struct nfsd4_conn
*alloc_conn_from_crses(struct svc_rqst
*rqstp
, struct nfsd4_create_session
*cses
)
1539 u32 dir
= NFS4_CDFC4_FORE
;
1541 if (cses
->flags
& SESSION4_BACK_CHAN
)
1542 dir
|= NFS4_CDFC4_BACK
;
1543 return alloc_conn(rqstp
, dir
);
1546 /* must be called under client_lock */
1547 static void nfsd4_del_conns(struct nfsd4_session
*s
)
1549 struct nfs4_client
*clp
= s
->se_client
;
1550 struct nfsd4_conn
*c
;
1552 spin_lock(&clp
->cl_lock
);
1553 while (!list_empty(&s
->se_conns
)) {
1554 c
= list_first_entry(&s
->se_conns
, struct nfsd4_conn
, cn_persession
);
1555 list_del_init(&c
->cn_persession
);
1556 spin_unlock(&clp
->cl_lock
);
1558 unregister_xpt_user(c
->cn_xprt
, &c
->cn_xpt_user
);
1561 spin_lock(&clp
->cl_lock
);
1563 spin_unlock(&clp
->cl_lock
);
1566 static void __free_session(struct nfsd4_session
*ses
)
1568 free_session_slots(ses
);
1572 static void free_session(struct nfsd4_session
*ses
)
1574 nfsd4_del_conns(ses
);
1575 nfsd4_put_drc_mem(&ses
->se_fchannel
);
1576 __free_session(ses
);
1579 static void init_session(struct svc_rqst
*rqstp
, struct nfsd4_session
*new, struct nfs4_client
*clp
, struct nfsd4_create_session
*cses
)
1582 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1584 new->se_client
= clp
;
1587 INIT_LIST_HEAD(&new->se_conns
);
1589 new->se_cb_seq_nr
= 1;
1590 new->se_flags
= cses
->flags
;
1591 new->se_cb_prog
= cses
->callback_prog
;
1592 new->se_cb_sec
= cses
->cb_sec
;
1593 atomic_set(&new->se_ref
, 0);
1594 idx
= hash_sessionid(&new->se_sessionid
);
1595 list_add(&new->se_hash
, &nn
->sessionid_hashtbl
[idx
]);
1596 spin_lock(&clp
->cl_lock
);
1597 list_add(&new->se_perclnt
, &clp
->cl_sessions
);
1598 spin_unlock(&clp
->cl_lock
);
1601 struct sockaddr
*sa
= svc_addr(rqstp
);
1603 * This is a little silly; with sessions there's no real
1604 * use for the callback address. Use the peer address
1605 * as a reasonable default for now, but consider fixing
1606 * the rpc client not to require an address in the
1609 rpc_copy_addr((struct sockaddr
*)&clp
->cl_cb_conn
.cb_addr
, sa
);
1610 clp
->cl_cb_conn
.cb_addrlen
= svc_addr_len(sa
);
1614 /* caller must hold client_lock */
1615 static struct nfsd4_session
*
1616 __find_in_sessionid_hashtbl(struct nfs4_sessionid
*sessionid
, struct net
*net
)
1618 struct nfsd4_session
*elem
;
1620 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1622 lockdep_assert_held(&nn
->client_lock
);
1624 dump_sessionid(__func__
, sessionid
);
1625 idx
= hash_sessionid(sessionid
);
1626 /* Search in the appropriate list */
1627 list_for_each_entry(elem
, &nn
->sessionid_hashtbl
[idx
], se_hash
) {
1628 if (!memcmp(elem
->se_sessionid
.data
, sessionid
->data
,
1629 NFS4_MAX_SESSIONID_LEN
)) {
1634 dprintk("%s: session not found\n", __func__
);
1638 static struct nfsd4_session
*
1639 find_in_sessionid_hashtbl(struct nfs4_sessionid
*sessionid
, struct net
*net
,
1642 struct nfsd4_session
*session
;
1643 __be32 status
= nfserr_badsession
;
1645 session
= __find_in_sessionid_hashtbl(sessionid
, net
);
1648 status
= nfsd4_get_session_locked(session
);
1656 /* caller must hold client_lock */
1658 unhash_session(struct nfsd4_session
*ses
)
1660 struct nfs4_client
*clp
= ses
->se_client
;
1661 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1663 lockdep_assert_held(&nn
->client_lock
);
1665 list_del(&ses
->se_hash
);
1666 spin_lock(&ses
->se_client
->cl_lock
);
1667 list_del(&ses
->se_perclnt
);
1668 spin_unlock(&ses
->se_client
->cl_lock
);
1671 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1673 STALE_CLIENTID(clientid_t
*clid
, struct nfsd_net
*nn
)
1676 * We're assuming the clid was not given out from a boot
1677 * precisely 2^32 (about 136 years) before this one. That seems
1678 * a safe assumption:
1680 if (clid
->cl_boot
== (u32
)nn
->boot_time
)
1682 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1683 clid
->cl_boot
, clid
->cl_id
, nn
->boot_time
);
1688 * XXX Should we use a slab cache ?
1689 * This type of memory management is somewhat inefficient, but we use it
1690 * anyway since SETCLIENTID is not a common operation.
1692 static struct nfs4_client
*alloc_client(struct xdr_netobj name
)
1694 struct nfs4_client
*clp
;
1697 clp
= kzalloc(sizeof(struct nfs4_client
), GFP_KERNEL
);
1700 clp
->cl_name
.data
= kmemdup(name
.data
, name
.len
, GFP_KERNEL
);
1701 if (clp
->cl_name
.data
== NULL
)
1703 clp
->cl_ownerstr_hashtbl
= kmalloc(sizeof(struct list_head
) *
1704 OWNER_HASH_SIZE
, GFP_KERNEL
);
1705 if (!clp
->cl_ownerstr_hashtbl
)
1706 goto err_no_hashtbl
;
1707 for (i
= 0; i
< OWNER_HASH_SIZE
; i
++)
1708 INIT_LIST_HEAD(&clp
->cl_ownerstr_hashtbl
[i
]);
1709 clp
->cl_name
.len
= name
.len
;
1710 INIT_LIST_HEAD(&clp
->cl_sessions
);
1711 idr_init(&clp
->cl_stateids
);
1712 atomic_set(&clp
->cl_refcount
, 0);
1713 clp
->cl_cb_state
= NFSD4_CB_UNKNOWN
;
1714 INIT_LIST_HEAD(&clp
->cl_idhash
);
1715 INIT_LIST_HEAD(&clp
->cl_openowners
);
1716 INIT_LIST_HEAD(&clp
->cl_delegations
);
1717 INIT_LIST_HEAD(&clp
->cl_lru
);
1718 INIT_LIST_HEAD(&clp
->cl_revoked
);
1719 #ifdef CONFIG_NFSD_PNFS
1720 INIT_LIST_HEAD(&clp
->cl_lo_states
);
1722 spin_lock_init(&clp
->cl_lock
);
1723 rpc_init_wait_queue(&clp
->cl_cb_waitq
, "Backchannel slot table");
1726 kfree(clp
->cl_name
.data
);
1733 free_client(struct nfs4_client
*clp
)
1735 while (!list_empty(&clp
->cl_sessions
)) {
1736 struct nfsd4_session
*ses
;
1737 ses
= list_entry(clp
->cl_sessions
.next
, struct nfsd4_session
,
1739 list_del(&ses
->se_perclnt
);
1740 WARN_ON_ONCE(atomic_read(&ses
->se_ref
));
1743 rpc_destroy_wait_queue(&clp
->cl_cb_waitq
);
1744 free_svc_cred(&clp
->cl_cred
);
1745 kfree(clp
->cl_ownerstr_hashtbl
);
1746 kfree(clp
->cl_name
.data
);
1747 idr_destroy(&clp
->cl_stateids
);
1751 /* must be called under the client_lock */
1753 unhash_client_locked(struct nfs4_client
*clp
)
1755 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1756 struct nfsd4_session
*ses
;
1758 lockdep_assert_held(&nn
->client_lock
);
1760 /* Mark the client as expired! */
1762 /* Make it invisible */
1763 if (!list_empty(&clp
->cl_idhash
)) {
1764 list_del_init(&clp
->cl_idhash
);
1765 if (test_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
))
1766 rb_erase(&clp
->cl_namenode
, &nn
->conf_name_tree
);
1768 rb_erase(&clp
->cl_namenode
, &nn
->unconf_name_tree
);
1770 list_del_init(&clp
->cl_lru
);
1771 spin_lock(&clp
->cl_lock
);
1772 list_for_each_entry(ses
, &clp
->cl_sessions
, se_perclnt
)
1773 list_del_init(&ses
->se_hash
);
1774 spin_unlock(&clp
->cl_lock
);
1778 unhash_client(struct nfs4_client
*clp
)
1780 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1782 spin_lock(&nn
->client_lock
);
1783 unhash_client_locked(clp
);
1784 spin_unlock(&nn
->client_lock
);
1787 static __be32
mark_client_expired_locked(struct nfs4_client
*clp
)
1789 if (atomic_read(&clp
->cl_refcount
))
1790 return nfserr_jukebox
;
1791 unhash_client_locked(clp
);
1796 __destroy_client(struct nfs4_client
*clp
)
1798 struct nfs4_openowner
*oo
;
1799 struct nfs4_delegation
*dp
;
1800 struct list_head reaplist
;
1802 INIT_LIST_HEAD(&reaplist
);
1803 spin_lock(&state_lock
);
1804 while (!list_empty(&clp
->cl_delegations
)) {
1805 dp
= list_entry(clp
->cl_delegations
.next
, struct nfs4_delegation
, dl_perclnt
);
1806 WARN_ON(!unhash_delegation_locked(dp
));
1807 list_add(&dp
->dl_recall_lru
, &reaplist
);
1809 spin_unlock(&state_lock
);
1810 while (!list_empty(&reaplist
)) {
1811 dp
= list_entry(reaplist
.next
, struct nfs4_delegation
, dl_recall_lru
);
1812 list_del_init(&dp
->dl_recall_lru
);
1813 put_clnt_odstate(dp
->dl_clnt_odstate
);
1814 nfs4_put_deleg_lease(dp
->dl_stid
.sc_file
);
1815 nfs4_put_stid(&dp
->dl_stid
);
1817 while (!list_empty(&clp
->cl_revoked
)) {
1818 dp
= list_entry(clp
->cl_revoked
.next
, struct nfs4_delegation
, dl_recall_lru
);
1819 list_del_init(&dp
->dl_recall_lru
);
1820 nfs4_put_stid(&dp
->dl_stid
);
1822 while (!list_empty(&clp
->cl_openowners
)) {
1823 oo
= list_entry(clp
->cl_openowners
.next
, struct nfs4_openowner
, oo_perclient
);
1824 nfs4_get_stateowner(&oo
->oo_owner
);
1825 release_openowner(oo
);
1827 nfsd4_return_all_client_layouts(clp
);
1828 nfsd4_shutdown_callback(clp
);
1829 if (clp
->cl_cb_conn
.cb_xprt
)
1830 svc_xprt_put(clp
->cl_cb_conn
.cb_xprt
);
1835 destroy_client(struct nfs4_client
*clp
)
1838 __destroy_client(clp
);
1841 static void expire_client(struct nfs4_client
*clp
)
1844 nfsd4_client_record_remove(clp
);
1845 __destroy_client(clp
);
1848 static void copy_verf(struct nfs4_client
*target
, nfs4_verifier
*source
)
1850 memcpy(target
->cl_verifier
.data
, source
->data
,
1851 sizeof(target
->cl_verifier
.data
));
1854 static void copy_clid(struct nfs4_client
*target
, struct nfs4_client
*source
)
1856 target
->cl_clientid
.cl_boot
= source
->cl_clientid
.cl_boot
;
1857 target
->cl_clientid
.cl_id
= source
->cl_clientid
.cl_id
;
1860 int strdup_if_nonnull(char **target
, char *source
)
1863 *target
= kstrdup(source
, GFP_KERNEL
);
1871 static int copy_cred(struct svc_cred
*target
, struct svc_cred
*source
)
1875 ret
= strdup_if_nonnull(&target
->cr_principal
, source
->cr_principal
);
1878 ret
= strdup_if_nonnull(&target
->cr_raw_principal
,
1879 source
->cr_raw_principal
);
1882 target
->cr_flavor
= source
->cr_flavor
;
1883 target
->cr_uid
= source
->cr_uid
;
1884 target
->cr_gid
= source
->cr_gid
;
1885 target
->cr_group_info
= source
->cr_group_info
;
1886 get_group_info(target
->cr_group_info
);
1887 target
->cr_gss_mech
= source
->cr_gss_mech
;
1888 if (source
->cr_gss_mech
)
1889 gss_mech_get(source
->cr_gss_mech
);
1894 compare_blob(const struct xdr_netobj
*o1
, const struct xdr_netobj
*o2
)
1896 if (o1
->len
< o2
->len
)
1898 if (o1
->len
> o2
->len
)
1900 return memcmp(o1
->data
, o2
->data
, o1
->len
);
1903 static int same_name(const char *n1
, const char *n2
)
1905 return 0 == memcmp(n1
, n2
, HEXDIR_LEN
);
1909 same_verf(nfs4_verifier
*v1
, nfs4_verifier
*v2
)
1911 return 0 == memcmp(v1
->data
, v2
->data
, sizeof(v1
->data
));
1915 same_clid(clientid_t
*cl1
, clientid_t
*cl2
)
1917 return (cl1
->cl_boot
== cl2
->cl_boot
) && (cl1
->cl_id
== cl2
->cl_id
);
1920 static bool groups_equal(struct group_info
*g1
, struct group_info
*g2
)
1924 if (g1
->ngroups
!= g2
->ngroups
)
1926 for (i
=0; i
<g1
->ngroups
; i
++)
1927 if (!gid_eq(GROUP_AT(g1
, i
), GROUP_AT(g2
, i
)))
1933 * RFC 3530 language requires clid_inuse be returned when the
1934 * "principal" associated with a requests differs from that previously
1935 * used. We use uid, gid's, and gss principal string as our best
1936 * approximation. We also don't want to allow non-gss use of a client
1937 * established using gss: in theory cr_principal should catch that
1938 * change, but in practice cr_principal can be null even in the gss case
1939 * since gssd doesn't always pass down a principal string.
1941 static bool is_gss_cred(struct svc_cred
*cr
)
1943 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1944 return (cr
->cr_flavor
> RPC_AUTH_MAXFLAVOR
);
1949 same_creds(struct svc_cred
*cr1
, struct svc_cred
*cr2
)
1951 if ((is_gss_cred(cr1
) != is_gss_cred(cr2
))
1952 || (!uid_eq(cr1
->cr_uid
, cr2
->cr_uid
))
1953 || (!gid_eq(cr1
->cr_gid
, cr2
->cr_gid
))
1954 || !groups_equal(cr1
->cr_group_info
, cr2
->cr_group_info
))
1956 if (cr1
->cr_principal
== cr2
->cr_principal
)
1958 if (!cr1
->cr_principal
|| !cr2
->cr_principal
)
1960 return 0 == strcmp(cr1
->cr_principal
, cr2
->cr_principal
);
1963 static bool svc_rqst_integrity_protected(struct svc_rqst
*rqstp
)
1965 struct svc_cred
*cr
= &rqstp
->rq_cred
;
1968 if (!cr
->cr_gss_mech
)
1970 service
= gss_pseudoflavor_to_service(cr
->cr_gss_mech
, cr
->cr_flavor
);
1971 return service
== RPC_GSS_SVC_INTEGRITY
||
1972 service
== RPC_GSS_SVC_PRIVACY
;
1975 static bool mach_creds_match(struct nfs4_client
*cl
, struct svc_rqst
*rqstp
)
1977 struct svc_cred
*cr
= &rqstp
->rq_cred
;
1979 if (!cl
->cl_mach_cred
)
1981 if (cl
->cl_cred
.cr_gss_mech
!= cr
->cr_gss_mech
)
1983 if (!svc_rqst_integrity_protected(rqstp
))
1985 if (cl
->cl_cred
.cr_raw_principal
)
1986 return 0 == strcmp(cl
->cl_cred
.cr_raw_principal
,
1987 cr
->cr_raw_principal
);
1988 if (!cr
->cr_principal
)
1990 return 0 == strcmp(cl
->cl_cred
.cr_principal
, cr
->cr_principal
);
1993 static void gen_confirm(struct nfs4_client
*clp
, struct nfsd_net
*nn
)
1998 * This is opaque to client, so no need to byte-swap. Use
1999 * __force to keep sparse happy
2001 verf
[0] = (__force __be32
)get_seconds();
2002 verf
[1] = (__force __be32
)nn
->clverifier_counter
++;
2003 memcpy(clp
->cl_confirm
.data
, verf
, sizeof(clp
->cl_confirm
.data
));
2006 static void gen_clid(struct nfs4_client
*clp
, struct nfsd_net
*nn
)
2008 clp
->cl_clientid
.cl_boot
= nn
->boot_time
;
2009 clp
->cl_clientid
.cl_id
= nn
->clientid_counter
++;
2010 gen_confirm(clp
, nn
);
2013 static struct nfs4_stid
*
2014 find_stateid_locked(struct nfs4_client
*cl
, stateid_t
*t
)
2016 struct nfs4_stid
*ret
;
2018 ret
= idr_find(&cl
->cl_stateids
, t
->si_opaque
.so_id
);
2019 if (!ret
|| !ret
->sc_type
)
2024 static struct nfs4_stid
*
2025 find_stateid_by_type(struct nfs4_client
*cl
, stateid_t
*t
, char typemask
)
2027 struct nfs4_stid
*s
;
2029 spin_lock(&cl
->cl_lock
);
2030 s
= find_stateid_locked(cl
, t
);
2032 if (typemask
& s
->sc_type
)
2033 atomic_inc(&s
->sc_count
);
2037 spin_unlock(&cl
->cl_lock
);
2041 static struct nfs4_client
*create_client(struct xdr_netobj name
,
2042 struct svc_rqst
*rqstp
, nfs4_verifier
*verf
)
2044 struct nfs4_client
*clp
;
2045 struct sockaddr
*sa
= svc_addr(rqstp
);
2047 struct net
*net
= SVC_NET(rqstp
);
2049 clp
= alloc_client(name
);
2053 ret
= copy_cred(&clp
->cl_cred
, &rqstp
->rq_cred
);
2058 nfsd4_init_cb(&clp
->cl_cb_null
, clp
, NULL
, NFSPROC4_CLNT_CB_NULL
);
2059 clp
->cl_time
= get_seconds();
2060 clear_bit(0, &clp
->cl_cb_slot_busy
);
2061 copy_verf(clp
, verf
);
2062 rpc_copy_addr((struct sockaddr
*) &clp
->cl_addr
, sa
);
2063 clp
->cl_cb_session
= NULL
;
2069 add_clp_to_name_tree(struct nfs4_client
*new_clp
, struct rb_root
*root
)
2071 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
2072 struct nfs4_client
*clp
;
2075 clp
= rb_entry(*new, struct nfs4_client
, cl_namenode
);
2078 if (compare_blob(&clp
->cl_name
, &new_clp
->cl_name
) > 0)
2079 new = &((*new)->rb_left
);
2081 new = &((*new)->rb_right
);
2084 rb_link_node(&new_clp
->cl_namenode
, parent
, new);
2085 rb_insert_color(&new_clp
->cl_namenode
, root
);
2088 static struct nfs4_client
*
2089 find_clp_in_name_tree(struct xdr_netobj
*name
, struct rb_root
*root
)
2092 struct rb_node
*node
= root
->rb_node
;
2093 struct nfs4_client
*clp
;
2096 clp
= rb_entry(node
, struct nfs4_client
, cl_namenode
);
2097 cmp
= compare_blob(&clp
->cl_name
, name
);
2099 node
= node
->rb_left
;
2101 node
= node
->rb_right
;
2109 add_to_unconfirmed(struct nfs4_client
*clp
)
2111 unsigned int idhashval
;
2112 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
2114 lockdep_assert_held(&nn
->client_lock
);
2116 clear_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
);
2117 add_clp_to_name_tree(clp
, &nn
->unconf_name_tree
);
2118 idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
2119 list_add(&clp
->cl_idhash
, &nn
->unconf_id_hashtbl
[idhashval
]);
2120 renew_client_locked(clp
);
2124 move_to_confirmed(struct nfs4_client
*clp
)
2126 unsigned int idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
2127 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
2129 lockdep_assert_held(&nn
->client_lock
);
2131 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp
);
2132 list_move(&clp
->cl_idhash
, &nn
->conf_id_hashtbl
[idhashval
]);
2133 rb_erase(&clp
->cl_namenode
, &nn
->unconf_name_tree
);
2134 add_clp_to_name_tree(clp
, &nn
->conf_name_tree
);
2135 set_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
);
2136 renew_client_locked(clp
);
2139 static struct nfs4_client
*
2140 find_client_in_id_table(struct list_head
*tbl
, clientid_t
*clid
, bool sessions
)
2142 struct nfs4_client
*clp
;
2143 unsigned int idhashval
= clientid_hashval(clid
->cl_id
);
2145 list_for_each_entry(clp
, &tbl
[idhashval
], cl_idhash
) {
2146 if (same_clid(&clp
->cl_clientid
, clid
)) {
2147 if ((bool)clp
->cl_minorversion
!= sessions
)
2149 renew_client_locked(clp
);
2156 static struct nfs4_client
*
2157 find_confirmed_client(clientid_t
*clid
, bool sessions
, struct nfsd_net
*nn
)
2159 struct list_head
*tbl
= nn
->conf_id_hashtbl
;
2161 lockdep_assert_held(&nn
->client_lock
);
2162 return find_client_in_id_table(tbl
, clid
, sessions
);
2165 static struct nfs4_client
*
2166 find_unconfirmed_client(clientid_t
*clid
, bool sessions
, struct nfsd_net
*nn
)
2168 struct list_head
*tbl
= nn
->unconf_id_hashtbl
;
2170 lockdep_assert_held(&nn
->client_lock
);
2171 return find_client_in_id_table(tbl
, clid
, sessions
);
2174 static bool clp_used_exchangeid(struct nfs4_client
*clp
)
2176 return clp
->cl_exchange_flags
!= 0;
2179 static struct nfs4_client
*
2180 find_confirmed_client_by_name(struct xdr_netobj
*name
, struct nfsd_net
*nn
)
2182 lockdep_assert_held(&nn
->client_lock
);
2183 return find_clp_in_name_tree(name
, &nn
->conf_name_tree
);
2186 static struct nfs4_client
*
2187 find_unconfirmed_client_by_name(struct xdr_netobj
*name
, struct nfsd_net
*nn
)
2189 lockdep_assert_held(&nn
->client_lock
);
2190 return find_clp_in_name_tree(name
, &nn
->unconf_name_tree
);
2194 gen_callback(struct nfs4_client
*clp
, struct nfsd4_setclientid
*se
, struct svc_rqst
*rqstp
)
2196 struct nfs4_cb_conn
*conn
= &clp
->cl_cb_conn
;
2197 struct sockaddr
*sa
= svc_addr(rqstp
);
2198 u32 scopeid
= rpc_get_scope_id(sa
);
2199 unsigned short expected_family
;
2201 /* Currently, we only support tcp and tcp6 for the callback channel */
2202 if (se
->se_callback_netid_len
== 3 &&
2203 !memcmp(se
->se_callback_netid_val
, "tcp", 3))
2204 expected_family
= AF_INET
;
2205 else if (se
->se_callback_netid_len
== 4 &&
2206 !memcmp(se
->se_callback_netid_val
, "tcp6", 4))
2207 expected_family
= AF_INET6
;
2211 conn
->cb_addrlen
= rpc_uaddr2sockaddr(clp
->net
, se
->se_callback_addr_val
,
2212 se
->se_callback_addr_len
,
2213 (struct sockaddr
*)&conn
->cb_addr
,
2214 sizeof(conn
->cb_addr
));
2216 if (!conn
->cb_addrlen
|| conn
->cb_addr
.ss_family
!= expected_family
)
2219 if (conn
->cb_addr
.ss_family
== AF_INET6
)
2220 ((struct sockaddr_in6
*)&conn
->cb_addr
)->sin6_scope_id
= scopeid
;
2222 conn
->cb_prog
= se
->se_callback_prog
;
2223 conn
->cb_ident
= se
->se_callback_ident
;
2224 memcpy(&conn
->cb_saddr
, &rqstp
->rq_daddr
, rqstp
->rq_daddrlen
);
2227 conn
->cb_addr
.ss_family
= AF_UNSPEC
;
2228 conn
->cb_addrlen
= 0;
2229 dprintk(KERN_INFO
"NFSD: this client (clientid %08x/%08x) "
2230 "will not receive delegations\n",
2231 clp
->cl_clientid
.cl_boot
, clp
->cl_clientid
.cl_id
);
2237 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2240 nfsd4_store_cache_entry(struct nfsd4_compoundres
*resp
)
2242 struct xdr_buf
*buf
= resp
->xdr
.buf
;
2243 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2246 dprintk("--> %s slot %p\n", __func__
, slot
);
2248 slot
->sl_opcnt
= resp
->opcnt
;
2249 slot
->sl_status
= resp
->cstate
.status
;
2251 slot
->sl_flags
|= NFSD4_SLOT_INITIALIZED
;
2252 if (nfsd4_not_cached(resp
)) {
2253 slot
->sl_datalen
= 0;
2256 base
= resp
->cstate
.data_offset
;
2257 slot
->sl_datalen
= buf
->len
- base
;
2258 if (read_bytes_from_xdr_buf(buf
, base
, slot
->sl_data
, slot
->sl_datalen
))
2259 WARN(1, "%s: sessions DRC could not cache compound\n",
2265 * Encode the replay sequence operation from the slot values.
2266 * If cachethis is FALSE encode the uncached rep error on the next
2267 * operation which sets resp->p and increments resp->opcnt for
2268 * nfs4svc_encode_compoundres.
2272 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs
*args
,
2273 struct nfsd4_compoundres
*resp
)
2275 struct nfsd4_op
*op
;
2276 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2278 /* Encode the replayed sequence operation */
2279 op
= &args
->ops
[resp
->opcnt
- 1];
2280 nfsd4_encode_operation(resp
, op
);
2282 /* Return nfserr_retry_uncached_rep in next operation. */
2283 if (args
->opcnt
> 1 && !(slot
->sl_flags
& NFSD4_SLOT_CACHETHIS
)) {
2284 op
= &args
->ops
[resp
->opcnt
++];
2285 op
->status
= nfserr_retry_uncached_rep
;
2286 nfsd4_encode_operation(resp
, op
);
2292 * The sequence operation is not cached because we can use the slot and
2296 nfsd4_replay_cache_entry(struct nfsd4_compoundres
*resp
,
2297 struct nfsd4_sequence
*seq
)
2299 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2300 struct xdr_stream
*xdr
= &resp
->xdr
;
2304 dprintk("--> %s slot %p\n", __func__
, slot
);
2306 status
= nfsd4_enc_sequence_replay(resp
->rqstp
->rq_argp
, resp
);
2310 p
= xdr_reserve_space(xdr
, slot
->sl_datalen
);
2313 return nfserr_serverfault
;
2315 xdr_encode_opaque_fixed(p
, slot
->sl_data
, slot
->sl_datalen
);
2316 xdr_commit_encode(xdr
);
2318 resp
->opcnt
= slot
->sl_opcnt
;
2319 return slot
->sl_status
;
2323 * Set the exchange_id flags returned by the server.
2326 nfsd4_set_ex_flags(struct nfs4_client
*new, struct nfsd4_exchange_id
*clid
)
2328 #ifdef CONFIG_NFSD_PNFS
2329 new->cl_exchange_flags
|= EXCHGID4_FLAG_USE_PNFS_MDS
;
2331 new->cl_exchange_flags
|= EXCHGID4_FLAG_USE_NON_PNFS
;
2334 /* Referrals are supported, Migration is not. */
2335 new->cl_exchange_flags
|= EXCHGID4_FLAG_SUPP_MOVED_REFER
;
2337 /* set the wire flags to return to client. */
2338 clid
->flags
= new->cl_exchange_flags
;
2341 static bool client_has_openowners(struct nfs4_client
*clp
)
2343 struct nfs4_openowner
*oo
;
2345 list_for_each_entry(oo
, &clp
->cl_openowners
, oo_perclient
) {
2346 if (!list_empty(&oo
->oo_owner
.so_stateids
))
2352 static bool client_has_state(struct nfs4_client
*clp
)
2354 return client_has_openowners(clp
)
2355 #ifdef CONFIG_NFSD_PNFS
2356 || !list_empty(&clp
->cl_lo_states
)
2358 || !list_empty(&clp
->cl_delegations
)
2359 || !list_empty(&clp
->cl_sessions
);
2363 nfsd4_exchange_id(struct svc_rqst
*rqstp
,
2364 struct nfsd4_compound_state
*cstate
,
2365 struct nfsd4_exchange_id
*exid
)
2367 struct nfs4_client
*conf
, *new;
2368 struct nfs4_client
*unconf
= NULL
;
2370 char addr_str
[INET6_ADDRSTRLEN
];
2371 nfs4_verifier verf
= exid
->verifier
;
2372 struct sockaddr
*sa
= svc_addr(rqstp
);
2373 bool update
= exid
->flags
& EXCHGID4_FLAG_UPD_CONFIRMED_REC_A
;
2374 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2376 rpc_ntop(sa
, addr_str
, sizeof(addr_str
));
2377 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2378 "ip_addr=%s flags %x, spa_how %d\n",
2379 __func__
, rqstp
, exid
, exid
->clname
.len
, exid
->clname
.data
,
2380 addr_str
, exid
->flags
, exid
->spa_how
);
2382 if (exid
->flags
& ~EXCHGID4_FLAG_MASK_A
)
2383 return nfserr_inval
;
2385 new = create_client(exid
->clname
, rqstp
, &verf
);
2387 return nfserr_jukebox
;
2389 switch (exid
->spa_how
) {
2391 if (!svc_rqst_integrity_protected(rqstp
)) {
2392 status
= nfserr_inval
;
2396 * Sometimes userspace doesn't give us a principal.
2397 * Which is a bug, really. Anyway, we can't enforce
2398 * MACH_CRED in that case, better to give up now:
2400 if (!new->cl_cred
.cr_principal
&&
2401 !new->cl_cred
.cr_raw_principal
) {
2402 status
= nfserr_serverfault
;
2405 new->cl_mach_cred
= true;
2408 default: /* checked by xdr code */
2411 status
= nfserr_encr_alg_unsupp
;
2415 /* Cases below refer to rfc 5661 section 18.35.4: */
2416 spin_lock(&nn
->client_lock
);
2417 conf
= find_confirmed_client_by_name(&exid
->clname
, nn
);
2419 bool creds_match
= same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
);
2420 bool verfs_match
= same_verf(&verf
, &conf
->cl_verifier
);
2423 if (!clp_used_exchangeid(conf
)) { /* buggy client */
2424 status
= nfserr_inval
;
2427 if (!mach_creds_match(conf
, rqstp
)) {
2428 status
= nfserr_wrong_cred
;
2431 if (!creds_match
) { /* case 9 */
2432 status
= nfserr_perm
;
2435 if (!verfs_match
) { /* case 8 */
2436 status
= nfserr_not_same
;
2440 exid
->flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2443 if (!creds_match
) { /* case 3 */
2444 if (client_has_state(conf
)) {
2445 status
= nfserr_clid_inuse
;
2450 if (verfs_match
) { /* case 2 */
2451 conf
->cl_exchange_flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2454 /* case 5, client reboot */
2459 if (update
) { /* case 7 */
2460 status
= nfserr_noent
;
2464 unconf
= find_unconfirmed_client_by_name(&exid
->clname
, nn
);
2465 if (unconf
) /* case 4, possible retry or client restart */
2466 unhash_client_locked(unconf
);
2468 /* case 1 (normal case) */
2471 status
= mark_client_expired_locked(conf
);
2475 new->cl_minorversion
= cstate
->minorversion
;
2478 add_to_unconfirmed(new);
2481 exid
->clientid
.cl_boot
= conf
->cl_clientid
.cl_boot
;
2482 exid
->clientid
.cl_id
= conf
->cl_clientid
.cl_id
;
2484 exid
->seqid
= conf
->cl_cs_slot
.sl_seqid
+ 1;
2485 nfsd4_set_ex_flags(conf
, exid
);
2487 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2488 conf
->cl_cs_slot
.sl_seqid
, conf
->cl_exchange_flags
);
2492 spin_unlock(&nn
->client_lock
);
2497 expire_client(unconf
);
2502 check_slot_seqid(u32 seqid
, u32 slot_seqid
, int slot_inuse
)
2504 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__
, seqid
,
2507 /* The slot is in use, and no response has been sent. */
2509 if (seqid
== slot_seqid
)
2510 return nfserr_jukebox
;
2512 return nfserr_seq_misordered
;
2514 /* Note unsigned 32-bit arithmetic handles wraparound: */
2515 if (likely(seqid
== slot_seqid
+ 1))
2517 if (seqid
== slot_seqid
)
2518 return nfserr_replay_cache
;
2519 return nfserr_seq_misordered
;
2523 * Cache the create session result into the create session single DRC
2524 * slot cache by saving the xdr structure. sl_seqid has been set.
2525 * Do this for solo or embedded create session operations.
2528 nfsd4_cache_create_session(struct nfsd4_create_session
*cr_ses
,
2529 struct nfsd4_clid_slot
*slot
, __be32 nfserr
)
2531 slot
->sl_status
= nfserr
;
2532 memcpy(&slot
->sl_cr_ses
, cr_ses
, sizeof(*cr_ses
));
2536 nfsd4_replay_create_session(struct nfsd4_create_session
*cr_ses
,
2537 struct nfsd4_clid_slot
*slot
)
2539 memcpy(cr_ses
, &slot
->sl_cr_ses
, sizeof(*cr_ses
));
2540 return slot
->sl_status
;
2543 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2544 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2545 1 + /* MIN tag is length with zero, only length */ \
2546 3 + /* version, opcount, opcode */ \
2547 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2548 /* seqid, slotID, slotID, cache */ \
2549 4 ) * sizeof(__be32))
2551 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2552 2 + /* verifier: AUTH_NULL, length 0 */\
2554 1 + /* MIN tag is length with zero, only length */ \
2555 3 + /* opcount, opcode, opstatus*/ \
2556 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2557 /* seqid, slotID, slotID, slotID, status */ \
2558 5 ) * sizeof(__be32))
2560 static __be32
check_forechannel_attrs(struct nfsd4_channel_attrs
*ca
, struct nfsd_net
*nn
)
2562 u32 maxrpc
= nn
->nfsd_serv
->sv_max_mesg
;
2564 if (ca
->maxreq_sz
< NFSD_MIN_REQ_HDR_SEQ_SZ
)
2565 return nfserr_toosmall
;
2566 if (ca
->maxresp_sz
< NFSD_MIN_RESP_HDR_SEQ_SZ
)
2567 return nfserr_toosmall
;
2568 ca
->headerpadsz
= 0;
2569 ca
->maxreq_sz
= min_t(u32
, ca
->maxreq_sz
, maxrpc
);
2570 ca
->maxresp_sz
= min_t(u32
, ca
->maxresp_sz
, maxrpc
);
2571 ca
->maxops
= min_t(u32
, ca
->maxops
, NFSD_MAX_OPS_PER_COMPOUND
);
2572 ca
->maxresp_cached
= min_t(u32
, ca
->maxresp_cached
,
2573 NFSD_SLOT_CACHE_SIZE
+ NFSD_MIN_HDR_SEQ_SZ
);
2574 ca
->maxreqs
= min_t(u32
, ca
->maxreqs
, NFSD_MAX_SLOTS_PER_SESSION
);
2576 * Note decreasing slot size below client's request may make it
2577 * difficult for client to function correctly, whereas
2578 * decreasing the number of slots will (just?) affect
2579 * performance. When short on memory we therefore prefer to
2580 * decrease number of slots instead of their size. Clients that
2581 * request larger slots than they need will get poor results:
2583 ca
->maxreqs
= nfsd4_get_drc_mem(ca
);
2585 return nfserr_jukebox
;
2591 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2592 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2594 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2595 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2597 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2598 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2600 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2601 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2602 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2603 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2606 static __be32
check_backchannel_attrs(struct nfsd4_channel_attrs
*ca
)
2608 ca
->headerpadsz
= 0;
2610 if (ca
->maxreq_sz
< NFSD_CB_MAX_REQ_SZ
)
2611 return nfserr_toosmall
;
2612 if (ca
->maxresp_sz
< NFSD_CB_MAX_RESP_SZ
)
2613 return nfserr_toosmall
;
2614 ca
->maxresp_cached
= 0;
2616 return nfserr_toosmall
;
2621 static __be32
nfsd4_check_cb_sec(struct nfsd4_cb_sec
*cbs
)
2623 switch (cbs
->flavor
) {
2629 * GSS case: the spec doesn't allow us to return this
2630 * error. But it also doesn't allow us not to support
2632 * I'd rather this fail hard than return some error the
2633 * client might think it can already handle:
2635 return nfserr_encr_alg_unsupp
;
2640 nfsd4_create_session(struct svc_rqst
*rqstp
,
2641 struct nfsd4_compound_state
*cstate
,
2642 struct nfsd4_create_session
*cr_ses
)
2644 struct sockaddr
*sa
= svc_addr(rqstp
);
2645 struct nfs4_client
*conf
, *unconf
;
2646 struct nfs4_client
*old
= NULL
;
2647 struct nfsd4_session
*new;
2648 struct nfsd4_conn
*conn
;
2649 struct nfsd4_clid_slot
*cs_slot
= NULL
;
2651 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2653 if (cr_ses
->flags
& ~SESSION4_FLAG_MASK_A
)
2654 return nfserr_inval
;
2655 status
= nfsd4_check_cb_sec(&cr_ses
->cb_sec
);
2658 status
= check_forechannel_attrs(&cr_ses
->fore_channel
, nn
);
2661 status
= check_backchannel_attrs(&cr_ses
->back_channel
);
2663 goto out_release_drc_mem
;
2664 status
= nfserr_jukebox
;
2665 new = alloc_session(&cr_ses
->fore_channel
, &cr_ses
->back_channel
);
2667 goto out_release_drc_mem
;
2668 conn
= alloc_conn_from_crses(rqstp
, cr_ses
);
2670 goto out_free_session
;
2672 spin_lock(&nn
->client_lock
);
2673 unconf
= find_unconfirmed_client(&cr_ses
->clientid
, true, nn
);
2674 conf
= find_confirmed_client(&cr_ses
->clientid
, true, nn
);
2675 WARN_ON_ONCE(conf
&& unconf
);
2678 status
= nfserr_wrong_cred
;
2679 if (!mach_creds_match(conf
, rqstp
))
2681 cs_slot
= &conf
->cl_cs_slot
;
2682 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2684 if (status
== nfserr_replay_cache
)
2685 status
= nfsd4_replay_create_session(cr_ses
, cs_slot
);
2688 } else if (unconf
) {
2689 if (!same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
) ||
2690 !rpc_cmp_addr(sa
, (struct sockaddr
*) &unconf
->cl_addr
)) {
2691 status
= nfserr_clid_inuse
;
2694 status
= nfserr_wrong_cred
;
2695 if (!mach_creds_match(unconf
, rqstp
))
2697 cs_slot
= &unconf
->cl_cs_slot
;
2698 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2700 /* an unconfirmed replay returns misordered */
2701 status
= nfserr_seq_misordered
;
2704 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
2706 status
= mark_client_expired_locked(old
);
2712 move_to_confirmed(unconf
);
2715 status
= nfserr_stale_clientid
;
2719 /* Persistent sessions are not supported */
2720 cr_ses
->flags
&= ~SESSION4_PERSIST
;
2721 /* Upshifting from TCP to RDMA is not supported */
2722 cr_ses
->flags
&= ~SESSION4_RDMA
;
2724 init_session(rqstp
, new, conf
, cr_ses
);
2725 nfsd4_get_session_locked(new);
2727 memcpy(cr_ses
->sessionid
.data
, new->se_sessionid
.data
,
2728 NFS4_MAX_SESSIONID_LEN
);
2729 cs_slot
->sl_seqid
++;
2730 cr_ses
->seqid
= cs_slot
->sl_seqid
;
2732 /* cache solo and embedded create sessions under the client_lock */
2733 nfsd4_cache_create_session(cr_ses
, cs_slot
, status
);
2734 spin_unlock(&nn
->client_lock
);
2735 /* init connection and backchannel */
2736 nfsd4_init_conn(rqstp
, conn
, new);
2737 nfsd4_put_session(new);
2742 spin_unlock(&nn
->client_lock
);
2747 __free_session(new);
2748 out_release_drc_mem
:
2749 nfsd4_put_drc_mem(&cr_ses
->fore_channel
);
2753 static __be32
nfsd4_map_bcts_dir(u32
*dir
)
2756 case NFS4_CDFC4_FORE
:
2757 case NFS4_CDFC4_BACK
:
2759 case NFS4_CDFC4_FORE_OR_BOTH
:
2760 case NFS4_CDFC4_BACK_OR_BOTH
:
2761 *dir
= NFS4_CDFC4_BOTH
;
2764 return nfserr_inval
;
2767 __be32
nfsd4_backchannel_ctl(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
, struct nfsd4_backchannel_ctl
*bc
)
2769 struct nfsd4_session
*session
= cstate
->session
;
2770 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2773 status
= nfsd4_check_cb_sec(&bc
->bc_cb_sec
);
2776 spin_lock(&nn
->client_lock
);
2777 session
->se_cb_prog
= bc
->bc_cb_program
;
2778 session
->se_cb_sec
= bc
->bc_cb_sec
;
2779 spin_unlock(&nn
->client_lock
);
2781 nfsd4_probe_callback(session
->se_client
);
2786 __be32
nfsd4_bind_conn_to_session(struct svc_rqst
*rqstp
,
2787 struct nfsd4_compound_state
*cstate
,
2788 struct nfsd4_bind_conn_to_session
*bcts
)
2791 struct nfsd4_conn
*conn
;
2792 struct nfsd4_session
*session
;
2793 struct net
*net
= SVC_NET(rqstp
);
2794 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
2796 if (!nfsd4_last_compound_op(rqstp
))
2797 return nfserr_not_only_op
;
2798 spin_lock(&nn
->client_lock
);
2799 session
= find_in_sessionid_hashtbl(&bcts
->sessionid
, net
, &status
);
2800 spin_unlock(&nn
->client_lock
);
2802 goto out_no_session
;
2803 status
= nfserr_wrong_cred
;
2804 if (!mach_creds_match(session
->se_client
, rqstp
))
2806 status
= nfsd4_map_bcts_dir(&bcts
->dir
);
2809 conn
= alloc_conn(rqstp
, bcts
->dir
);
2810 status
= nfserr_jukebox
;
2813 nfsd4_init_conn(rqstp
, conn
, session
);
2816 nfsd4_put_session(session
);
2821 static bool nfsd4_compound_in_session(struct nfsd4_session
*session
, struct nfs4_sessionid
*sid
)
2825 return !memcmp(sid
, &session
->se_sessionid
, sizeof(*sid
));
2829 nfsd4_destroy_session(struct svc_rqst
*r
,
2830 struct nfsd4_compound_state
*cstate
,
2831 struct nfsd4_destroy_session
*sessionid
)
2833 struct nfsd4_session
*ses
;
2835 int ref_held_by_me
= 0;
2836 struct net
*net
= SVC_NET(r
);
2837 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
2839 status
= nfserr_not_only_op
;
2840 if (nfsd4_compound_in_session(cstate
->session
, &sessionid
->sessionid
)) {
2841 if (!nfsd4_last_compound_op(r
))
2845 dump_sessionid(__func__
, &sessionid
->sessionid
);
2846 spin_lock(&nn
->client_lock
);
2847 ses
= find_in_sessionid_hashtbl(&sessionid
->sessionid
, net
, &status
);
2849 goto out_client_lock
;
2850 status
= nfserr_wrong_cred
;
2851 if (!mach_creds_match(ses
->se_client
, r
))
2852 goto out_put_session
;
2853 status
= mark_session_dead_locked(ses
, 1 + ref_held_by_me
);
2855 goto out_put_session
;
2856 unhash_session(ses
);
2857 spin_unlock(&nn
->client_lock
);
2859 nfsd4_probe_callback_sync(ses
->se_client
);
2861 spin_lock(&nn
->client_lock
);
2864 nfsd4_put_session_locked(ses
);
2866 spin_unlock(&nn
->client_lock
);
2871 static struct nfsd4_conn
*__nfsd4_find_conn(struct svc_xprt
*xpt
, struct nfsd4_session
*s
)
2873 struct nfsd4_conn
*c
;
2875 list_for_each_entry(c
, &s
->se_conns
, cn_persession
) {
2876 if (c
->cn_xprt
== xpt
) {
2883 static __be32
nfsd4_sequence_check_conn(struct nfsd4_conn
*new, struct nfsd4_session
*ses
)
2885 struct nfs4_client
*clp
= ses
->se_client
;
2886 struct nfsd4_conn
*c
;
2887 __be32 status
= nfs_ok
;
2890 spin_lock(&clp
->cl_lock
);
2891 c
= __nfsd4_find_conn(new->cn_xprt
, ses
);
2894 status
= nfserr_conn_not_bound_to_session
;
2895 if (clp
->cl_mach_cred
)
2897 __nfsd4_hash_conn(new, ses
);
2898 spin_unlock(&clp
->cl_lock
);
2899 ret
= nfsd4_register_conn(new);
2901 /* oops; xprt is already down: */
2902 nfsd4_conn_lost(&new->cn_xpt_user
);
2905 spin_unlock(&clp
->cl_lock
);
2910 static bool nfsd4_session_too_many_ops(struct svc_rqst
*rqstp
, struct nfsd4_session
*session
)
2912 struct nfsd4_compoundargs
*args
= rqstp
->rq_argp
;
2914 return args
->opcnt
> session
->se_fchannel
.maxops
;
2917 static bool nfsd4_request_too_big(struct svc_rqst
*rqstp
,
2918 struct nfsd4_session
*session
)
2920 struct xdr_buf
*xb
= &rqstp
->rq_arg
;
2922 return xb
->len
> session
->se_fchannel
.maxreq_sz
;
2926 nfsd4_sequence(struct svc_rqst
*rqstp
,
2927 struct nfsd4_compound_state
*cstate
,
2928 struct nfsd4_sequence
*seq
)
2930 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
2931 struct xdr_stream
*xdr
= &resp
->xdr
;
2932 struct nfsd4_session
*session
;
2933 struct nfs4_client
*clp
;
2934 struct nfsd4_slot
*slot
;
2935 struct nfsd4_conn
*conn
;
2938 struct net
*net
= SVC_NET(rqstp
);
2939 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
2941 if (resp
->opcnt
!= 1)
2942 return nfserr_sequence_pos
;
2945 * Will be either used or freed by nfsd4_sequence_check_conn
2948 conn
= alloc_conn(rqstp
, NFS4_CDFC4_FORE
);
2950 return nfserr_jukebox
;
2952 spin_lock(&nn
->client_lock
);
2953 session
= find_in_sessionid_hashtbl(&seq
->sessionid
, net
, &status
);
2955 goto out_no_session
;
2956 clp
= session
->se_client
;
2958 status
= nfserr_too_many_ops
;
2959 if (nfsd4_session_too_many_ops(rqstp
, session
))
2960 goto out_put_session
;
2962 status
= nfserr_req_too_big
;
2963 if (nfsd4_request_too_big(rqstp
, session
))
2964 goto out_put_session
;
2966 status
= nfserr_badslot
;
2967 if (seq
->slotid
>= session
->se_fchannel
.maxreqs
)
2968 goto out_put_session
;
2970 slot
= session
->se_slots
[seq
->slotid
];
2971 dprintk("%s: slotid %d\n", __func__
, seq
->slotid
);
2973 /* We do not negotiate the number of slots yet, so set the
2974 * maxslots to the session maxreqs which is used to encode
2975 * sr_highest_slotid and the sr_target_slot id to maxslots */
2976 seq
->maxslots
= session
->se_fchannel
.maxreqs
;
2978 status
= check_slot_seqid(seq
->seqid
, slot
->sl_seqid
,
2979 slot
->sl_flags
& NFSD4_SLOT_INUSE
);
2980 if (status
== nfserr_replay_cache
) {
2981 status
= nfserr_seq_misordered
;
2982 if (!(slot
->sl_flags
& NFSD4_SLOT_INITIALIZED
))
2983 goto out_put_session
;
2984 cstate
->slot
= slot
;
2985 cstate
->session
= session
;
2987 /* Return the cached reply status and set cstate->status
2988 * for nfsd4_proc_compound processing */
2989 status
= nfsd4_replay_cache_entry(resp
, seq
);
2990 cstate
->status
= nfserr_replay_cache
;
2994 goto out_put_session
;
2996 status
= nfsd4_sequence_check_conn(conn
, session
);
2999 goto out_put_session
;
3001 buflen
= (seq
->cachethis
) ?
3002 session
->se_fchannel
.maxresp_cached
:
3003 session
->se_fchannel
.maxresp_sz
;
3004 status
= (seq
->cachethis
) ? nfserr_rep_too_big_to_cache
:
3006 if (xdr_restrict_buflen(xdr
, buflen
- rqstp
->rq_auth_slack
))
3007 goto out_put_session
;
3008 svc_reserve(rqstp
, buflen
);
3011 /* Success! bump slot seqid */
3012 slot
->sl_seqid
= seq
->seqid
;
3013 slot
->sl_flags
|= NFSD4_SLOT_INUSE
;
3015 slot
->sl_flags
|= NFSD4_SLOT_CACHETHIS
;
3017 slot
->sl_flags
&= ~NFSD4_SLOT_CACHETHIS
;
3019 cstate
->slot
= slot
;
3020 cstate
->session
= session
;
3024 switch (clp
->cl_cb_state
) {
3026 seq
->status_flags
= SEQ4_STATUS_CB_PATH_DOWN
;
3028 case NFSD4_CB_FAULT
:
3029 seq
->status_flags
= SEQ4_STATUS_BACKCHANNEL_FAULT
;
3032 seq
->status_flags
= 0;
3034 if (!list_empty(&clp
->cl_revoked
))
3035 seq
->status_flags
|= SEQ4_STATUS_RECALLABLE_STATE_REVOKED
;
3039 spin_unlock(&nn
->client_lock
);
3042 nfsd4_put_session_locked(session
);
3043 goto out_no_session
;
3047 nfsd4_sequence_done(struct nfsd4_compoundres
*resp
)
3049 struct nfsd4_compound_state
*cs
= &resp
->cstate
;
3051 if (nfsd4_has_session(cs
)) {
3052 if (cs
->status
!= nfserr_replay_cache
) {
3053 nfsd4_store_cache_entry(resp
);
3054 cs
->slot
->sl_flags
&= ~NFSD4_SLOT_INUSE
;
3056 /* Drop session reference that was taken in nfsd4_sequence() */
3057 nfsd4_put_session(cs
->session
);
3059 put_client_renew(cs
->clp
);
3063 nfsd4_destroy_clientid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
, struct nfsd4_destroy_clientid
*dc
)
3065 struct nfs4_client
*conf
, *unconf
;
3066 struct nfs4_client
*clp
= NULL
;
3068 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3070 spin_lock(&nn
->client_lock
);
3071 unconf
= find_unconfirmed_client(&dc
->clientid
, true, nn
);
3072 conf
= find_confirmed_client(&dc
->clientid
, true, nn
);
3073 WARN_ON_ONCE(conf
&& unconf
);
3076 if (client_has_state(conf
)) {
3077 status
= nfserr_clientid_busy
;
3080 status
= mark_client_expired_locked(conf
);
3087 status
= nfserr_stale_clientid
;
3090 if (!mach_creds_match(clp
, rqstp
)) {
3092 status
= nfserr_wrong_cred
;
3095 unhash_client_locked(clp
);
3097 spin_unlock(&nn
->client_lock
);
3104 nfsd4_reclaim_complete(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
, struct nfsd4_reclaim_complete
*rc
)
3108 if (rc
->rca_one_fs
) {
3109 if (!cstate
->current_fh
.fh_dentry
)
3110 return nfserr_nofilehandle
;
3112 * We don't take advantage of the rca_one_fs case.
3113 * That's OK, it's optional, we can safely ignore it.
3118 status
= nfserr_complete_already
;
3119 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
,
3120 &cstate
->session
->se_client
->cl_flags
))
3123 status
= nfserr_stale_clientid
;
3124 if (is_client_expired(cstate
->session
->se_client
))
3126 * The following error isn't really legal.
3127 * But we only get here if the client just explicitly
3128 * destroyed the client. Surely it no longer cares what
3129 * error it gets back on an operation for the dead
3135 nfsd4_client_record_create(cstate
->session
->se_client
);
3141 nfsd4_setclientid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3142 struct nfsd4_setclientid
*setclid
)
3144 struct xdr_netobj clname
= setclid
->se_name
;
3145 nfs4_verifier clverifier
= setclid
->se_verf
;
3146 struct nfs4_client
*conf
, *new;
3147 struct nfs4_client
*unconf
= NULL
;
3149 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3151 new = create_client(clname
, rqstp
, &clverifier
);
3153 return nfserr_jukebox
;
3154 /* Cases below refer to rfc 3530 section 14.2.33: */
3155 spin_lock(&nn
->client_lock
);
3156 conf
= find_confirmed_client_by_name(&clname
, nn
);
3157 if (conf
&& client_has_state(conf
)) {
3159 status
= nfserr_clid_inuse
;
3160 if (clp_used_exchangeid(conf
))
3162 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
)) {
3163 char addr_str
[INET6_ADDRSTRLEN
];
3164 rpc_ntop((struct sockaddr
*) &conf
->cl_addr
, addr_str
,
3166 dprintk("NFSD: setclientid: string in use by client "
3167 "at %s\n", addr_str
);
3171 unconf
= find_unconfirmed_client_by_name(&clname
, nn
);
3173 unhash_client_locked(unconf
);
3174 if (conf
&& same_verf(&conf
->cl_verifier
, &clverifier
)) {
3175 /* case 1: probable callback update */
3176 copy_clid(new, conf
);
3177 gen_confirm(new, nn
);
3178 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3180 new->cl_minorversion
= 0;
3181 gen_callback(new, setclid
, rqstp
);
3182 add_to_unconfirmed(new);
3183 setclid
->se_clientid
.cl_boot
= new->cl_clientid
.cl_boot
;
3184 setclid
->se_clientid
.cl_id
= new->cl_clientid
.cl_id
;
3185 memcpy(setclid
->se_confirm
.data
, new->cl_confirm
.data
, sizeof(setclid
->se_confirm
.data
));
3189 spin_unlock(&nn
->client_lock
);
3193 expire_client(unconf
);
3199 nfsd4_setclientid_confirm(struct svc_rqst
*rqstp
,
3200 struct nfsd4_compound_state
*cstate
,
3201 struct nfsd4_setclientid_confirm
*setclientid_confirm
)
3203 struct nfs4_client
*conf
, *unconf
;
3204 struct nfs4_client
*old
= NULL
;
3205 nfs4_verifier confirm
= setclientid_confirm
->sc_confirm
;
3206 clientid_t
* clid
= &setclientid_confirm
->sc_clientid
;
3208 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3210 if (STALE_CLIENTID(clid
, nn
))
3211 return nfserr_stale_clientid
;
3213 spin_lock(&nn
->client_lock
);
3214 conf
= find_confirmed_client(clid
, false, nn
);
3215 unconf
= find_unconfirmed_client(clid
, false, nn
);
3217 * We try hard to give out unique clientid's, so if we get an
3218 * attempt to confirm the same clientid with a different cred,
3219 * the client may be buggy; this should never happen.
3221 * Nevertheless, RFC 7530 recommends INUSE for this case:
3223 status
= nfserr_clid_inuse
;
3224 if (unconf
&& !same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
))
3226 if (conf
&& !same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
))
3228 /* cases below refer to rfc 3530 section 14.2.34: */
3229 if (!unconf
|| !same_verf(&confirm
, &unconf
->cl_confirm
)) {
3230 if (conf
&& !unconf
) /* case 2: probable retransmit */
3232 else /* case 4: client hasn't noticed we rebooted yet? */
3233 status
= nfserr_stale_clientid
;
3237 if (conf
) { /* case 1: callback update */
3239 unhash_client_locked(old
);
3240 nfsd4_change_callback(conf
, &unconf
->cl_cb_conn
);
3241 } else { /* case 3: normal case; new or rebooted client */
3242 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
3244 status
= nfserr_clid_inuse
;
3245 if (client_has_state(old
)
3246 && !same_creds(&unconf
->cl_cred
,
3249 status
= mark_client_expired_locked(old
);
3255 move_to_confirmed(unconf
);
3258 get_client_locked(conf
);
3259 spin_unlock(&nn
->client_lock
);
3260 nfsd4_probe_callback(conf
);
3261 spin_lock(&nn
->client_lock
);
3262 put_client_renew_locked(conf
);
3264 spin_unlock(&nn
->client_lock
);
3270 static struct nfs4_file
*nfsd4_alloc_file(void)
3272 return kmem_cache_alloc(file_slab
, GFP_KERNEL
);
3275 /* OPEN Share state helper functions */
3276 static void nfsd4_init_file(struct knfsd_fh
*fh
, unsigned int hashval
,
3277 struct nfs4_file
*fp
)
3279 lockdep_assert_held(&state_lock
);
3281 atomic_set(&fp
->fi_ref
, 1);
3282 spin_lock_init(&fp
->fi_lock
);
3283 INIT_LIST_HEAD(&fp
->fi_stateids
);
3284 INIT_LIST_HEAD(&fp
->fi_delegations
);
3285 INIT_LIST_HEAD(&fp
->fi_clnt_odstate
);
3286 fh_copy_shallow(&fp
->fi_fhandle
, fh
);
3287 fp
->fi_deleg_file
= NULL
;
3288 fp
->fi_had_conflict
= false;
3289 fp
->fi_share_deny
= 0;
3290 memset(fp
->fi_fds
, 0, sizeof(fp
->fi_fds
));
3291 memset(fp
->fi_access
, 0, sizeof(fp
->fi_access
));
3292 #ifdef CONFIG_NFSD_PNFS
3293 INIT_LIST_HEAD(&fp
->fi_lo_states
);
3294 atomic_set(&fp
->fi_lo_recalls
, 0);
3296 hlist_add_head_rcu(&fp
->fi_hash
, &file_hashtbl
[hashval
]);
3300 nfsd4_free_slabs(void)
3302 kmem_cache_destroy(odstate_slab
);
3303 kmem_cache_destroy(openowner_slab
);
3304 kmem_cache_destroy(lockowner_slab
);
3305 kmem_cache_destroy(file_slab
);
3306 kmem_cache_destroy(stateid_slab
);
3307 kmem_cache_destroy(deleg_slab
);
3311 nfsd4_init_slabs(void)
3313 openowner_slab
= kmem_cache_create("nfsd4_openowners",
3314 sizeof(struct nfs4_openowner
), 0, 0, NULL
);
3315 if (openowner_slab
== NULL
)
3317 lockowner_slab
= kmem_cache_create("nfsd4_lockowners",
3318 sizeof(struct nfs4_lockowner
), 0, 0, NULL
);
3319 if (lockowner_slab
== NULL
)
3320 goto out_free_openowner_slab
;
3321 file_slab
= kmem_cache_create("nfsd4_files",
3322 sizeof(struct nfs4_file
), 0, 0, NULL
);
3323 if (file_slab
== NULL
)
3324 goto out_free_lockowner_slab
;
3325 stateid_slab
= kmem_cache_create("nfsd4_stateids",
3326 sizeof(struct nfs4_ol_stateid
), 0, 0, NULL
);
3327 if (stateid_slab
== NULL
)
3328 goto out_free_file_slab
;
3329 deleg_slab
= kmem_cache_create("nfsd4_delegations",
3330 sizeof(struct nfs4_delegation
), 0, 0, NULL
);
3331 if (deleg_slab
== NULL
)
3332 goto out_free_stateid_slab
;
3333 odstate_slab
= kmem_cache_create("nfsd4_odstate",
3334 sizeof(struct nfs4_clnt_odstate
), 0, 0, NULL
);
3335 if (odstate_slab
== NULL
)
3336 goto out_free_deleg_slab
;
3339 out_free_deleg_slab
:
3340 kmem_cache_destroy(deleg_slab
);
3341 out_free_stateid_slab
:
3342 kmem_cache_destroy(stateid_slab
);
3344 kmem_cache_destroy(file_slab
);
3345 out_free_lockowner_slab
:
3346 kmem_cache_destroy(lockowner_slab
);
3347 out_free_openowner_slab
:
3348 kmem_cache_destroy(openowner_slab
);
3350 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3354 static void init_nfs4_replay(struct nfs4_replay
*rp
)
3356 rp
->rp_status
= nfserr_serverfault
;
3358 rp
->rp_buf
= rp
->rp_ibuf
;
3359 mutex_init(&rp
->rp_mutex
);
3362 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state
*cstate
,
3363 struct nfs4_stateowner
*so
)
3365 if (!nfsd4_has_session(cstate
)) {
3366 mutex_lock(&so
->so_replay
.rp_mutex
);
3367 cstate
->replay_owner
= nfs4_get_stateowner(so
);
3371 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state
*cstate
)
3373 struct nfs4_stateowner
*so
= cstate
->replay_owner
;
3376 cstate
->replay_owner
= NULL
;
3377 mutex_unlock(&so
->so_replay
.rp_mutex
);
3378 nfs4_put_stateowner(so
);
3382 static inline void *alloc_stateowner(struct kmem_cache
*slab
, struct xdr_netobj
*owner
, struct nfs4_client
*clp
)
3384 struct nfs4_stateowner
*sop
;
3386 sop
= kmem_cache_alloc(slab
, GFP_KERNEL
);
3390 sop
->so_owner
.data
= kmemdup(owner
->data
, owner
->len
, GFP_KERNEL
);
3391 if (!sop
->so_owner
.data
) {
3392 kmem_cache_free(slab
, sop
);
3395 sop
->so_owner
.len
= owner
->len
;
3397 INIT_LIST_HEAD(&sop
->so_stateids
);
3398 sop
->so_client
= clp
;
3399 init_nfs4_replay(&sop
->so_replay
);
3400 atomic_set(&sop
->so_count
, 1);
3404 static void hash_openowner(struct nfs4_openowner
*oo
, struct nfs4_client
*clp
, unsigned int strhashval
)
3406 lockdep_assert_held(&clp
->cl_lock
);
3408 list_add(&oo
->oo_owner
.so_strhash
,
3409 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
3410 list_add(&oo
->oo_perclient
, &clp
->cl_openowners
);
3413 static void nfs4_unhash_openowner(struct nfs4_stateowner
*so
)
3415 unhash_openowner_locked(openowner(so
));
3418 static void nfs4_free_openowner(struct nfs4_stateowner
*so
)
3420 struct nfs4_openowner
*oo
= openowner(so
);
3422 kmem_cache_free(openowner_slab
, oo
);
3425 static const struct nfs4_stateowner_operations openowner_ops
= {
3426 .so_unhash
= nfs4_unhash_openowner
,
3427 .so_free
= nfs4_free_openowner
,
3430 static struct nfs4_ol_stateid
*
3431 nfsd4_find_existing_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3433 struct nfs4_ol_stateid
*local
, *ret
= NULL
;
3434 struct nfs4_openowner
*oo
= open
->op_openowner
;
3436 lockdep_assert_held(&fp
->fi_lock
);
3438 list_for_each_entry(local
, &fp
->fi_stateids
, st_perfile
) {
3439 /* ignore lock owners */
3440 if (local
->st_stateowner
->so_is_open_owner
== 0)
3442 if (local
->st_stateowner
== &oo
->oo_owner
) {
3444 atomic_inc(&ret
->st_stid
.sc_count
);
3451 static struct nfs4_openowner
*
3452 alloc_init_open_stateowner(unsigned int strhashval
, struct nfsd4_open
*open
,
3453 struct nfsd4_compound_state
*cstate
)
3455 struct nfs4_client
*clp
= cstate
->clp
;
3456 struct nfs4_openowner
*oo
, *ret
;
3458 oo
= alloc_stateowner(openowner_slab
, &open
->op_owner
, clp
);
3461 oo
->oo_owner
.so_ops
= &openowner_ops
;
3462 oo
->oo_owner
.so_is_open_owner
= 1;
3463 oo
->oo_owner
.so_seqid
= open
->op_seqid
;
3465 if (nfsd4_has_session(cstate
))
3466 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
3468 oo
->oo_last_closed_stid
= NULL
;
3469 INIT_LIST_HEAD(&oo
->oo_close_lru
);
3470 spin_lock(&clp
->cl_lock
);
3471 ret
= find_openstateowner_str_locked(strhashval
, open
, clp
);
3473 hash_openowner(oo
, clp
, strhashval
);
3476 nfs4_free_stateowner(&oo
->oo_owner
);
3478 spin_unlock(&clp
->cl_lock
);
3482 static struct nfs4_ol_stateid
*
3483 init_open_stateid(struct nfs4_ol_stateid
*stp
, struct nfs4_file
*fp
,
3484 struct nfsd4_open
*open
)
3487 struct nfs4_openowner
*oo
= open
->op_openowner
;
3488 struct nfs4_ol_stateid
*retstp
= NULL
;
3490 spin_lock(&oo
->oo_owner
.so_client
->cl_lock
);
3491 spin_lock(&fp
->fi_lock
);
3493 retstp
= nfsd4_find_existing_open(fp
, open
);
3496 atomic_inc(&stp
->st_stid
.sc_count
);
3497 stp
->st_stid
.sc_type
= NFS4_OPEN_STID
;
3498 INIT_LIST_HEAD(&stp
->st_locks
);
3499 stp
->st_stateowner
= nfs4_get_stateowner(&oo
->oo_owner
);
3501 stp
->st_stid
.sc_file
= fp
;
3502 stp
->st_access_bmap
= 0;
3503 stp
->st_deny_bmap
= 0;
3504 stp
->st_openstp
= NULL
;
3505 mutex_init(&stp
->st_mutex
);
3506 list_add(&stp
->st_perstateowner
, &oo
->oo_owner
.so_stateids
);
3507 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
3510 spin_unlock(&fp
->fi_lock
);
3511 spin_unlock(&oo
->oo_owner
.so_client
->cl_lock
);
3516 * In the 4.0 case we need to keep the owners around a little while to handle
3517 * CLOSE replay. We still do need to release any file access that is held by
3518 * them before returning however.
3521 move_to_close_lru(struct nfs4_ol_stateid
*s
, struct net
*net
)
3523 struct nfs4_ol_stateid
*last
;
3524 struct nfs4_openowner
*oo
= openowner(s
->st_stateowner
);
3525 struct nfsd_net
*nn
= net_generic(s
->st_stid
.sc_client
->net
,
3528 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo
);
3531 * We know that we hold one reference via nfsd4_close, and another
3532 * "persistent" reference for the client. If the refcount is higher
3533 * than 2, then there are still calls in progress that are using this
3534 * stateid. We can't put the sc_file reference until they are finished.
3535 * Wait for the refcount to drop to 2. Since it has been unhashed,
3536 * there should be no danger of the refcount going back up again at
3539 wait_event(close_wq
, atomic_read(&s
->st_stid
.sc_count
) == 2);
3541 release_all_access(s
);
3542 if (s
->st_stid
.sc_file
) {
3543 put_nfs4_file(s
->st_stid
.sc_file
);
3544 s
->st_stid
.sc_file
= NULL
;
3547 spin_lock(&nn
->client_lock
);
3548 last
= oo
->oo_last_closed_stid
;
3549 oo
->oo_last_closed_stid
= s
;
3550 list_move_tail(&oo
->oo_close_lru
, &nn
->close_lru
);
3551 oo
->oo_time
= get_seconds();
3552 spin_unlock(&nn
->client_lock
);
3554 nfs4_put_stid(&last
->st_stid
);
3557 /* search file_hashtbl[] for file */
3558 static struct nfs4_file
*
3559 find_file_locked(struct knfsd_fh
*fh
, unsigned int hashval
)
3561 struct nfs4_file
*fp
;
3563 hlist_for_each_entry_rcu(fp
, &file_hashtbl
[hashval
], fi_hash
) {
3564 if (fh_match(&fp
->fi_fhandle
, fh
)) {
3565 if (atomic_inc_not_zero(&fp
->fi_ref
))
3573 find_file(struct knfsd_fh
*fh
)
3575 struct nfs4_file
*fp
;
3576 unsigned int hashval
= file_hashval(fh
);
3579 fp
= find_file_locked(fh
, hashval
);
3584 static struct nfs4_file
*
3585 find_or_add_file(struct nfs4_file
*new, struct knfsd_fh
*fh
)
3587 struct nfs4_file
*fp
;
3588 unsigned int hashval
= file_hashval(fh
);
3591 fp
= find_file_locked(fh
, hashval
);
3596 spin_lock(&state_lock
);
3597 fp
= find_file_locked(fh
, hashval
);
3598 if (likely(fp
== NULL
)) {
3599 nfsd4_init_file(fh
, hashval
, new);
3602 spin_unlock(&state_lock
);
3608 * Called to check deny when READ with all zero stateid or
3609 * WRITE with all zero or all one stateid
3612 nfs4_share_conflict(struct svc_fh
*current_fh
, unsigned int deny_type
)
3614 struct nfs4_file
*fp
;
3615 __be32 ret
= nfs_ok
;
3617 fp
= find_file(¤t_fh
->fh_handle
);
3620 /* Check for conflicting share reservations */
3621 spin_lock(&fp
->fi_lock
);
3622 if (fp
->fi_share_deny
& deny_type
)
3623 ret
= nfserr_locked
;
3624 spin_unlock(&fp
->fi_lock
);
3629 static void nfsd4_cb_recall_prepare(struct nfsd4_callback
*cb
)
3631 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3632 struct nfsd_net
*nn
= net_generic(dp
->dl_stid
.sc_client
->net
,
3635 block_delegations(&dp
->dl_stid
.sc_file
->fi_fhandle
);
3638 * We can't do this in nfsd_break_deleg_cb because it is
3639 * already holding inode->i_lock.
3641 * If the dl_time != 0, then we know that it has already been
3642 * queued for a lease break. Don't queue it again.
3644 spin_lock(&state_lock
);
3645 if (dp
->dl_time
== 0) {
3646 dp
->dl_time
= get_seconds();
3647 list_add_tail(&dp
->dl_recall_lru
, &nn
->del_recall_lru
);
3649 spin_unlock(&state_lock
);
3652 static int nfsd4_cb_recall_done(struct nfsd4_callback
*cb
,
3653 struct rpc_task
*task
)
3655 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3657 if (dp
->dl_stid
.sc_type
== NFS4_CLOSED_DELEG_STID
)
3660 switch (task
->tk_status
) {
3664 case -NFS4ERR_BAD_STATEID
:
3666 * Race: client probably got cb_recall before open reply
3667 * granting delegation.
3669 if (dp
->dl_retries
--) {
3670 rpc_delay(task
, 2 * HZ
);
3679 static void nfsd4_cb_recall_release(struct nfsd4_callback
*cb
)
3681 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3683 nfs4_put_stid(&dp
->dl_stid
);
3686 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops
= {
3687 .prepare
= nfsd4_cb_recall_prepare
,
3688 .done
= nfsd4_cb_recall_done
,
3689 .release
= nfsd4_cb_recall_release
,
3692 static void nfsd_break_one_deleg(struct nfs4_delegation
*dp
)
3695 * We're assuming the state code never drops its reference
3696 * without first removing the lease. Since we're in this lease
3697 * callback (and since the lease code is serialized by the kernel
3698 * lock) we know the server hasn't removed the lease yet, we know
3699 * it's safe to take a reference.
3701 atomic_inc(&dp
->dl_stid
.sc_count
);
3702 nfsd4_run_cb(&dp
->dl_recall
);
3705 /* Called from break_lease() with i_lock held. */
3707 nfsd_break_deleg_cb(struct file_lock
*fl
)
3710 struct nfs4_file
*fp
= (struct nfs4_file
*)fl
->fl_owner
;
3711 struct nfs4_delegation
*dp
;
3714 WARN(1, "(%p)->fl_owner NULL\n", fl
);
3717 if (fp
->fi_had_conflict
) {
3718 WARN(1, "duplicate break on %p\n", fp
);
3722 * We don't want the locks code to timeout the lease for us;
3723 * we'll remove it ourself if a delegation isn't returned
3726 fl
->fl_break_time
= 0;
3728 spin_lock(&fp
->fi_lock
);
3729 fp
->fi_had_conflict
= true;
3731 * If there are no delegations on the list, then return true
3732 * so that the lease code will go ahead and delete it.
3734 if (list_empty(&fp
->fi_delegations
))
3737 list_for_each_entry(dp
, &fp
->fi_delegations
, dl_perfile
)
3738 nfsd_break_one_deleg(dp
);
3739 spin_unlock(&fp
->fi_lock
);
3744 nfsd_change_deleg_cb(struct file_lock
*onlist
, int arg
,
3745 struct list_head
*dispose
)
3748 return lease_modify(onlist
, arg
, dispose
);
3753 static const struct lock_manager_operations nfsd_lease_mng_ops
= {
3754 .lm_break
= nfsd_break_deleg_cb
,
3755 .lm_change
= nfsd_change_deleg_cb
,
3758 static __be32
nfsd4_check_seqid(struct nfsd4_compound_state
*cstate
, struct nfs4_stateowner
*so
, u32 seqid
)
3760 if (nfsd4_has_session(cstate
))
3762 if (seqid
== so
->so_seqid
- 1)
3763 return nfserr_replay_me
;
3764 if (seqid
== so
->so_seqid
)
3766 return nfserr_bad_seqid
;
3769 static __be32
lookup_clientid(clientid_t
*clid
,
3770 struct nfsd4_compound_state
*cstate
,
3771 struct nfsd_net
*nn
)
3773 struct nfs4_client
*found
;
3776 found
= cstate
->clp
;
3777 if (!same_clid(&found
->cl_clientid
, clid
))
3778 return nfserr_stale_clientid
;
3782 if (STALE_CLIENTID(clid
, nn
))
3783 return nfserr_stale_clientid
;
3786 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3787 * cached already then we know this is for is for v4.0 and "sessions"
3790 WARN_ON_ONCE(cstate
->session
);
3791 spin_lock(&nn
->client_lock
);
3792 found
= find_confirmed_client(clid
, false, nn
);
3794 spin_unlock(&nn
->client_lock
);
3795 return nfserr_expired
;
3797 atomic_inc(&found
->cl_refcount
);
3798 spin_unlock(&nn
->client_lock
);
3800 /* Cache the nfs4_client in cstate! */
3801 cstate
->clp
= found
;
3806 nfsd4_process_open1(struct nfsd4_compound_state
*cstate
,
3807 struct nfsd4_open
*open
, struct nfsd_net
*nn
)
3809 clientid_t
*clientid
= &open
->op_clientid
;
3810 struct nfs4_client
*clp
= NULL
;
3811 unsigned int strhashval
;
3812 struct nfs4_openowner
*oo
= NULL
;
3815 if (STALE_CLIENTID(&open
->op_clientid
, nn
))
3816 return nfserr_stale_clientid
;
3818 * In case we need it later, after we've already created the
3819 * file and don't want to risk a further failure:
3821 open
->op_file
= nfsd4_alloc_file();
3822 if (open
->op_file
== NULL
)
3823 return nfserr_jukebox
;
3825 status
= lookup_clientid(clientid
, cstate
, nn
);
3830 strhashval
= ownerstr_hashval(&open
->op_owner
);
3831 oo
= find_openstateowner_str(strhashval
, open
, clp
);
3832 open
->op_openowner
= oo
;
3836 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
3837 /* Replace unconfirmed owners without checking for replay. */
3838 release_openowner(oo
);
3839 open
->op_openowner
= NULL
;
3842 status
= nfsd4_check_seqid(cstate
, &oo
->oo_owner
, open
->op_seqid
);
3847 oo
= alloc_init_open_stateowner(strhashval
, open
, cstate
);
3849 return nfserr_jukebox
;
3850 open
->op_openowner
= oo
;
3852 open
->op_stp
= nfs4_alloc_open_stateid(clp
);
3854 return nfserr_jukebox
;
3856 if (nfsd4_has_session(cstate
) &&
3857 (cstate
->current_fh
.fh_export
->ex_flags
& NFSEXP_PNFS
)) {
3858 open
->op_odstate
= alloc_clnt_odstate(clp
);
3859 if (!open
->op_odstate
)
3860 return nfserr_jukebox
;
3866 static inline __be32
3867 nfs4_check_delegmode(struct nfs4_delegation
*dp
, int flags
)
3869 if ((flags
& WR_STATE
) && (dp
->dl_type
== NFS4_OPEN_DELEGATE_READ
))
3870 return nfserr_openmode
;
3875 static int share_access_to_flags(u32 share_access
)
3877 return share_access
== NFS4_SHARE_ACCESS_READ
? RD_STATE
: WR_STATE
;
3880 static struct nfs4_delegation
*find_deleg_stateid(struct nfs4_client
*cl
, stateid_t
*s
)
3882 struct nfs4_stid
*ret
;
3884 ret
= find_stateid_by_type(cl
, s
, NFS4_DELEG_STID
);
3887 return delegstateid(ret
);
3890 static bool nfsd4_is_deleg_cur(struct nfsd4_open
*open
)
3892 return open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEGATE_CUR
||
3893 open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEG_CUR_FH
;
3897 nfs4_check_deleg(struct nfs4_client
*cl
, struct nfsd4_open
*open
,
3898 struct nfs4_delegation
**dp
)
3901 __be32 status
= nfserr_bad_stateid
;
3902 struct nfs4_delegation
*deleg
;
3904 deleg
= find_deleg_stateid(cl
, &open
->op_delegate_stateid
);
3907 flags
= share_access_to_flags(open
->op_share_access
);
3908 status
= nfs4_check_delegmode(deleg
, flags
);
3910 nfs4_put_stid(&deleg
->dl_stid
);
3915 if (!nfsd4_is_deleg_cur(open
))
3919 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
3923 static inline int nfs4_access_to_access(u32 nfs4_access
)
3927 if (nfs4_access
& NFS4_SHARE_ACCESS_READ
)
3928 flags
|= NFSD_MAY_READ
;
3929 if (nfs4_access
& NFS4_SHARE_ACCESS_WRITE
)
3930 flags
|= NFSD_MAY_WRITE
;
3934 static inline __be32
3935 nfsd4_truncate(struct svc_rqst
*rqstp
, struct svc_fh
*fh
,
3936 struct nfsd4_open
*open
)
3938 struct iattr iattr
= {
3939 .ia_valid
= ATTR_SIZE
,
3942 if (!open
->op_truncate
)
3944 if (!(open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
))
3945 return nfserr_inval
;
3946 return nfsd_setattr(rqstp
, fh
, &iattr
, 0, (time_t)0);
3949 static __be32
nfs4_get_vfs_file(struct svc_rqst
*rqstp
, struct nfs4_file
*fp
,
3950 struct svc_fh
*cur_fh
, struct nfs4_ol_stateid
*stp
,
3951 struct nfsd4_open
*open
)
3953 struct file
*filp
= NULL
;
3955 int oflag
= nfs4_access_to_omode(open
->op_share_access
);
3956 int access
= nfs4_access_to_access(open
->op_share_access
);
3957 unsigned char old_access_bmap
, old_deny_bmap
;
3959 spin_lock(&fp
->fi_lock
);
3962 * Are we trying to set a deny mode that would conflict with
3965 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
3966 if (status
!= nfs_ok
) {
3967 spin_unlock(&fp
->fi_lock
);
3971 /* set access to the file */
3972 status
= nfs4_file_get_access(fp
, open
->op_share_access
);
3973 if (status
!= nfs_ok
) {
3974 spin_unlock(&fp
->fi_lock
);
3978 /* Set access bits in stateid */
3979 old_access_bmap
= stp
->st_access_bmap
;
3980 set_access(open
->op_share_access
, stp
);
3982 /* Set new deny mask */
3983 old_deny_bmap
= stp
->st_deny_bmap
;
3984 set_deny(open
->op_share_deny
, stp
);
3985 fp
->fi_share_deny
|= (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
3987 if (!fp
->fi_fds
[oflag
]) {
3988 spin_unlock(&fp
->fi_lock
);
3989 status
= nfsd_open(rqstp
, cur_fh
, S_IFREG
, access
, &filp
);
3991 goto out_put_access
;
3992 spin_lock(&fp
->fi_lock
);
3993 if (!fp
->fi_fds
[oflag
]) {
3994 fp
->fi_fds
[oflag
] = filp
;
3998 spin_unlock(&fp
->fi_lock
);
4002 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4004 goto out_put_access
;
4008 stp
->st_access_bmap
= old_access_bmap
;
4009 nfs4_file_put_access(fp
, open
->op_share_access
);
4010 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap
), stp
);
4015 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
)
4018 unsigned char old_deny_bmap
= stp
->st_deny_bmap
;
4020 if (!test_access(open
->op_share_access
, stp
))
4021 return nfs4_get_vfs_file(rqstp
, fp
, cur_fh
, stp
, open
);
4023 /* test and set deny mode */
4024 spin_lock(&fp
->fi_lock
);
4025 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
4026 if (status
== nfs_ok
) {
4027 set_deny(open
->op_share_deny
, stp
);
4028 fp
->fi_share_deny
|=
4029 (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
4031 spin_unlock(&fp
->fi_lock
);
4033 if (status
!= nfs_ok
)
4036 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4037 if (status
!= nfs_ok
)
4038 reset_union_bmap_deny(old_deny_bmap
, stp
);
4042 /* Should we give out recallable state?: */
4043 static bool nfsd4_cb_channel_good(struct nfs4_client
*clp
)
4045 if (clp
->cl_cb_state
== NFSD4_CB_UP
)
4048 * In the sessions case, since we don't have to establish a
4049 * separate connection for callbacks, we assume it's OK
4050 * until we hear otherwise:
4052 return clp
->cl_minorversion
&& clp
->cl_cb_state
== NFSD4_CB_UNKNOWN
;
4055 static struct file_lock
*nfs4_alloc_init_lease(struct nfs4_file
*fp
, int flag
)
4057 struct file_lock
*fl
;
4059 fl
= locks_alloc_lock();
4062 fl
->fl_lmops
= &nfsd_lease_mng_ops
;
4063 fl
->fl_flags
= FL_DELEG
;
4064 fl
->fl_type
= flag
== NFS4_OPEN_DELEGATE_READ
? F_RDLCK
: F_WRLCK
;
4065 fl
->fl_end
= OFFSET_MAX
;
4066 fl
->fl_owner
= (fl_owner_t
)fp
;
4067 fl
->fl_pid
= current
->tgid
;
4072 * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
4073 * @dp: a pointer to the nfs4_delegation we're adding.
4076 * On success: Return code will be 0 on success.
4078 * On error: -EAGAIN if there was an existing delegation.
4079 * nonzero if there is an error in other cases.
4083 static int nfs4_setlease(struct nfs4_delegation
*dp
)
4085 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
4086 struct file_lock
*fl
;
4090 fl
= nfs4_alloc_init_lease(fp
, NFS4_OPEN_DELEGATE_READ
);
4093 filp
= find_readable_file(fp
);
4095 /* We should always have a readable file here */
4097 locks_free_lock(fl
);
4101 status
= vfs_setlease(filp
, fl
->fl_type
, &fl
, NULL
);
4103 locks_free_lock(fl
);
4106 spin_lock(&state_lock
);
4107 spin_lock(&fp
->fi_lock
);
4108 /* Did the lease get broken before we took the lock? */
4110 if (fp
->fi_had_conflict
)
4113 if (fp
->fi_deleg_file
) {
4114 status
= hash_delegation_locked(dp
, fp
);
4117 fp
->fi_deleg_file
= filp
;
4118 fp
->fi_delegees
= 0;
4119 status
= hash_delegation_locked(dp
, fp
);
4120 spin_unlock(&fp
->fi_lock
);
4121 spin_unlock(&state_lock
);
4123 /* Should never happen, this is a new fi_deleg_file */
4129 spin_unlock(&fp
->fi_lock
);
4130 spin_unlock(&state_lock
);
4136 static struct nfs4_delegation
*
4137 nfs4_set_delegation(struct nfs4_client
*clp
, struct svc_fh
*fh
,
4138 struct nfs4_file
*fp
, struct nfs4_clnt_odstate
*odstate
)
4141 struct nfs4_delegation
*dp
;
4143 if (fp
->fi_had_conflict
)
4144 return ERR_PTR(-EAGAIN
);
4146 spin_lock(&state_lock
);
4147 spin_lock(&fp
->fi_lock
);
4148 status
= nfs4_get_existing_delegation(clp
, fp
);
4149 spin_unlock(&fp
->fi_lock
);
4150 spin_unlock(&state_lock
);
4153 return ERR_PTR(status
);
4155 dp
= alloc_init_deleg(clp
, fh
, odstate
);
4157 return ERR_PTR(-ENOMEM
);
4160 spin_lock(&state_lock
);
4161 spin_lock(&fp
->fi_lock
);
4162 dp
->dl_stid
.sc_file
= fp
;
4163 if (!fp
->fi_deleg_file
) {
4164 spin_unlock(&fp
->fi_lock
);
4165 spin_unlock(&state_lock
);
4166 status
= nfs4_setlease(dp
);
4169 if (fp
->fi_had_conflict
) {
4173 status
= hash_delegation_locked(dp
, fp
);
4175 spin_unlock(&fp
->fi_lock
);
4176 spin_unlock(&state_lock
);
4179 put_clnt_odstate(dp
->dl_clnt_odstate
);
4180 nfs4_put_stid(&dp
->dl_stid
);
4181 return ERR_PTR(status
);
4186 static void nfsd4_open_deleg_none_ext(struct nfsd4_open
*open
, int status
)
4188 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4189 if (status
== -EAGAIN
)
4190 open
->op_why_no_deleg
= WND4_CONTENTION
;
4192 open
->op_why_no_deleg
= WND4_RESOURCE
;
4193 switch (open
->op_deleg_want
) {
4194 case NFS4_SHARE_WANT_READ_DELEG
:
4195 case NFS4_SHARE_WANT_WRITE_DELEG
:
4196 case NFS4_SHARE_WANT_ANY_DELEG
:
4198 case NFS4_SHARE_WANT_CANCEL
:
4199 open
->op_why_no_deleg
= WND4_CANCELLED
;
4201 case NFS4_SHARE_WANT_NO_DELEG
:
4208 * Attempt to hand out a delegation.
4210 * Note we don't support write delegations, and won't until the vfs has
4211 * proper support for them.
4214 nfs4_open_delegation(struct svc_fh
*fh
, struct nfsd4_open
*open
,
4215 struct nfs4_ol_stateid
*stp
)
4217 struct nfs4_delegation
*dp
;
4218 struct nfs4_openowner
*oo
= openowner(stp
->st_stateowner
);
4219 struct nfs4_client
*clp
= stp
->st_stid
.sc_client
;
4223 cb_up
= nfsd4_cb_channel_good(oo
->oo_owner
.so_client
);
4224 open
->op_recall
= 0;
4225 switch (open
->op_claim_type
) {
4226 case NFS4_OPEN_CLAIM_PREVIOUS
:
4228 open
->op_recall
= 1;
4229 if (open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_READ
)
4232 case NFS4_OPEN_CLAIM_NULL
:
4233 case NFS4_OPEN_CLAIM_FH
:
4235 * Let's not give out any delegations till everyone's
4236 * had the chance to reclaim theirs, *and* until
4237 * NLM locks have all been reclaimed:
4239 if (locks_in_grace(clp
->net
))
4241 if (!cb_up
|| !(oo
->oo_flags
& NFS4_OO_CONFIRMED
))
4244 * Also, if the file was opened for write or
4245 * create, there's a good chance the client's
4246 * about to write to it, resulting in an
4247 * immediate recall (since we don't support
4248 * write delegations):
4250 if (open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
)
4252 if (open
->op_create
== NFS4_OPEN_CREATE
)
4258 dp
= nfs4_set_delegation(clp
, fh
, stp
->st_stid
.sc_file
, stp
->st_clnt_odstate
);
4262 memcpy(&open
->op_delegate_stateid
, &dp
->dl_stid
.sc_stateid
, sizeof(dp
->dl_stid
.sc_stateid
));
4264 dprintk("NFSD: delegation stateid=" STATEID_FMT
"\n",
4265 STATEID_VAL(&dp
->dl_stid
.sc_stateid
));
4266 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_READ
;
4267 nfs4_put_stid(&dp
->dl_stid
);
4270 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE
;
4271 if (open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
&&
4272 open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_NONE
) {
4273 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4274 open
->op_recall
= 1;
4277 /* 4.1 client asking for a delegation? */
4278 if (open
->op_deleg_want
)
4279 nfsd4_open_deleg_none_ext(open
, status
);
4283 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open
*open
,
4284 struct nfs4_delegation
*dp
)
4286 if (open
->op_deleg_want
== NFS4_SHARE_WANT_READ_DELEG
&&
4287 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4288 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4289 open
->op_why_no_deleg
= WND4_NOT_SUPP_DOWNGRADE
;
4290 } else if (open
->op_deleg_want
== NFS4_SHARE_WANT_WRITE_DELEG
&&
4291 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4292 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4293 open
->op_why_no_deleg
= WND4_NOT_SUPP_UPGRADE
;
4295 /* Otherwise the client must be confused wanting a delegation
4296 * it already has, therefore we don't return
4297 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4302 nfsd4_process_open2(struct svc_rqst
*rqstp
, struct svc_fh
*current_fh
, struct nfsd4_open
*open
)
4304 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
4305 struct nfs4_client
*cl
= open
->op_openowner
->oo_owner
.so_client
;
4306 struct nfs4_file
*fp
= NULL
;
4307 struct nfs4_ol_stateid
*stp
= NULL
;
4308 struct nfs4_ol_stateid
*swapstp
= NULL
;
4309 struct nfs4_delegation
*dp
= NULL
;
4313 * Lookup file; if found, lookup stateid and check open request,
4314 * and check for delegations in the process of being recalled.
4315 * If not found, create the nfs4_file struct
4317 fp
= find_or_add_file(open
->op_file
, ¤t_fh
->fh_handle
);
4318 if (fp
!= open
->op_file
) {
4319 status
= nfs4_check_deleg(cl
, open
, &dp
);
4322 spin_lock(&fp
->fi_lock
);
4323 stp
= nfsd4_find_existing_open(fp
, open
);
4324 spin_unlock(&fp
->fi_lock
);
4326 open
->op_file
= NULL
;
4327 status
= nfserr_bad_stateid
;
4328 if (nfsd4_is_deleg_cur(open
))
4333 * OPEN the file, or upgrade an existing OPEN.
4334 * If truncate fails, the OPEN fails.
4337 /* Stateid was found, this is an OPEN upgrade */
4338 mutex_lock(&stp
->st_mutex
);
4339 status
= nfs4_upgrade_open(rqstp
, fp
, current_fh
, stp
, open
);
4341 mutex_unlock(&stp
->st_mutex
);
4346 open
->op_stp
= NULL
;
4347 swapstp
= init_open_stateid(stp
, fp
, open
);
4349 nfs4_put_stid(&stp
->st_stid
);
4351 mutex_lock(&stp
->st_mutex
);
4352 status
= nfs4_upgrade_open(rqstp
, fp
, current_fh
,
4355 mutex_unlock(&stp
->st_mutex
);
4360 mutex_lock(&stp
->st_mutex
);
4361 status
= nfs4_get_vfs_file(rqstp
, fp
, current_fh
, stp
, open
);
4363 mutex_unlock(&stp
->st_mutex
);
4364 release_open_stateid(stp
);
4368 stp
->st_clnt_odstate
= find_or_hash_clnt_odstate(fp
,
4370 if (stp
->st_clnt_odstate
== open
->op_odstate
)
4371 open
->op_odstate
= NULL
;
4374 nfs4_inc_and_copy_stateid(&open
->op_stateid
, &stp
->st_stid
);
4375 mutex_unlock(&stp
->st_mutex
);
4377 if (nfsd4_has_session(&resp
->cstate
)) {
4378 if (open
->op_deleg_want
& NFS4_SHARE_WANT_NO_DELEG
) {
4379 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4380 open
->op_why_no_deleg
= WND4_NOT_WANTED
;
4386 * Attempt to hand out a delegation. No error return, because the
4387 * OPEN succeeds even if we fail.
4389 nfs4_open_delegation(current_fh
, open
, stp
);
4393 dprintk("%s: stateid=" STATEID_FMT
"\n", __func__
,
4394 STATEID_VAL(&stp
->st_stid
.sc_stateid
));
4396 /* 4.1 client trying to upgrade/downgrade delegation? */
4397 if (open
->op_delegate_type
== NFS4_OPEN_DELEGATE_NONE
&& dp
&&
4398 open
->op_deleg_want
)
4399 nfsd4_deleg_xgrade_none_ext(open
, dp
);
4403 if (status
== 0 && open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
)
4404 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
4406 * To finish the open response, we just need to set the rflags.
4408 open
->op_rflags
= NFS4_OPEN_RESULT_LOCKTYPE_POSIX
;
4409 if (!(open
->op_openowner
->oo_flags
& NFS4_OO_CONFIRMED
) &&
4410 !nfsd4_has_session(&resp
->cstate
))
4411 open
->op_rflags
|= NFS4_OPEN_RESULT_CONFIRM
;
4413 nfs4_put_stid(&dp
->dl_stid
);
4415 nfs4_put_stid(&stp
->st_stid
);
4420 void nfsd4_cleanup_open_state(struct nfsd4_compound_state
*cstate
,
4421 struct nfsd4_open
*open
)
4423 if (open
->op_openowner
) {
4424 struct nfs4_stateowner
*so
= &open
->op_openowner
->oo_owner
;
4426 nfsd4_cstate_assign_replay(cstate
, so
);
4427 nfs4_put_stateowner(so
);
4430 kmem_cache_free(file_slab
, open
->op_file
);
4432 nfs4_put_stid(&open
->op_stp
->st_stid
);
4433 if (open
->op_odstate
)
4434 kmem_cache_free(odstate_slab
, open
->op_odstate
);
4438 nfsd4_renew(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
4441 struct nfs4_client
*clp
;
4443 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
4445 dprintk("process_renew(%08x/%08x): starting\n",
4446 clid
->cl_boot
, clid
->cl_id
);
4447 status
= lookup_clientid(clid
, cstate
, nn
);
4451 status
= nfserr_cb_path_down
;
4452 if (!list_empty(&clp
->cl_delegations
)
4453 && clp
->cl_cb_state
!= NFSD4_CB_UP
)
4461 nfsd4_end_grace(struct nfsd_net
*nn
)
4463 /* do nothing if grace period already ended */
4464 if (nn
->grace_ended
)
4467 dprintk("NFSD: end of grace period\n");
4468 nn
->grace_ended
= true;
4470 * If the server goes down again right now, an NFSv4
4471 * client will still be allowed to reclaim after it comes back up,
4472 * even if it hasn't yet had a chance to reclaim state this time.
4475 nfsd4_record_grace_done(nn
);
4477 * At this point, NFSv4 clients can still reclaim. But if the
4478 * server crashes, any that have not yet reclaimed will be out
4479 * of luck on the next boot.
4481 * (NFSv4.1+ clients are considered to have reclaimed once they
4482 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4483 * have reclaimed after their first OPEN.)
4485 locks_end_grace(&nn
->nfsd4_manager
);
4487 * At this point, and once lockd and/or any other containers
4488 * exit their grace period, further reclaims will fail and
4489 * regular locking can resume.
4494 nfs4_laundromat(struct nfsd_net
*nn
)
4496 struct nfs4_client
*clp
;
4497 struct nfs4_openowner
*oo
;
4498 struct nfs4_delegation
*dp
;
4499 struct nfs4_ol_stateid
*stp
;
4500 struct list_head
*pos
, *next
, reaplist
;
4501 time_t cutoff
= get_seconds() - nn
->nfsd4_lease
;
4502 time_t t
, new_timeo
= nn
->nfsd4_lease
;
4504 dprintk("NFSD: laundromat service - starting\n");
4505 nfsd4_end_grace(nn
);
4506 INIT_LIST_HEAD(&reaplist
);
4507 spin_lock(&nn
->client_lock
);
4508 list_for_each_safe(pos
, next
, &nn
->client_lru
) {
4509 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4510 if (time_after((unsigned long)clp
->cl_time
, (unsigned long)cutoff
)) {
4511 t
= clp
->cl_time
- cutoff
;
4512 new_timeo
= min(new_timeo
, t
);
4515 if (mark_client_expired_locked(clp
)) {
4516 dprintk("NFSD: client in use (clientid %08x)\n",
4517 clp
->cl_clientid
.cl_id
);
4520 list_add(&clp
->cl_lru
, &reaplist
);
4522 spin_unlock(&nn
->client_lock
);
4523 list_for_each_safe(pos
, next
, &reaplist
) {
4524 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4525 dprintk("NFSD: purging unused client (clientid %08x)\n",
4526 clp
->cl_clientid
.cl_id
);
4527 list_del_init(&clp
->cl_lru
);
4530 spin_lock(&state_lock
);
4531 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
4532 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
4533 if (time_after((unsigned long)dp
->dl_time
, (unsigned long)cutoff
)) {
4534 t
= dp
->dl_time
- cutoff
;
4535 new_timeo
= min(new_timeo
, t
);
4538 WARN_ON(!unhash_delegation_locked(dp
));
4539 list_add(&dp
->dl_recall_lru
, &reaplist
);
4541 spin_unlock(&state_lock
);
4542 while (!list_empty(&reaplist
)) {
4543 dp
= list_first_entry(&reaplist
, struct nfs4_delegation
,
4545 list_del_init(&dp
->dl_recall_lru
);
4546 revoke_delegation(dp
);
4549 spin_lock(&nn
->client_lock
);
4550 while (!list_empty(&nn
->close_lru
)) {
4551 oo
= list_first_entry(&nn
->close_lru
, struct nfs4_openowner
,
4553 if (time_after((unsigned long)oo
->oo_time
,
4554 (unsigned long)cutoff
)) {
4555 t
= oo
->oo_time
- cutoff
;
4556 new_timeo
= min(new_timeo
, t
);
4559 list_del_init(&oo
->oo_close_lru
);
4560 stp
= oo
->oo_last_closed_stid
;
4561 oo
->oo_last_closed_stid
= NULL
;
4562 spin_unlock(&nn
->client_lock
);
4563 nfs4_put_stid(&stp
->st_stid
);
4564 spin_lock(&nn
->client_lock
);
4566 spin_unlock(&nn
->client_lock
);
4568 new_timeo
= max_t(time_t, new_timeo
, NFSD_LAUNDROMAT_MINTIMEOUT
);
4572 static struct workqueue_struct
*laundry_wq
;
4573 static void laundromat_main(struct work_struct
*);
4576 laundromat_main(struct work_struct
*laundry
)
4579 struct delayed_work
*dwork
= to_delayed_work(laundry
);
4580 struct nfsd_net
*nn
= container_of(dwork
, struct nfsd_net
,
4583 t
= nfs4_laundromat(nn
);
4584 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t
);
4585 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, t
*HZ
);
4588 static inline __be32
nfs4_check_fh(struct svc_fh
*fhp
, struct nfs4_stid
*stp
)
4590 if (!fh_match(&fhp
->fh_handle
, &stp
->sc_file
->fi_fhandle
))
4591 return nfserr_bad_stateid
;
4596 access_permit_read(struct nfs4_ol_stateid
*stp
)
4598 return test_access(NFS4_SHARE_ACCESS_READ
, stp
) ||
4599 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
) ||
4600 test_access(NFS4_SHARE_ACCESS_WRITE
, stp
);
4604 access_permit_write(struct nfs4_ol_stateid
*stp
)
4606 return test_access(NFS4_SHARE_ACCESS_WRITE
, stp
) ||
4607 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
);
4611 __be32
nfs4_check_openmode(struct nfs4_ol_stateid
*stp
, int flags
)
4613 __be32 status
= nfserr_openmode
;
4615 /* For lock stateid's, we test the parent open, not the lock: */
4616 if (stp
->st_openstp
)
4617 stp
= stp
->st_openstp
;
4618 if ((flags
& WR_STATE
) && !access_permit_write(stp
))
4620 if ((flags
& RD_STATE
) && !access_permit_read(stp
))
4627 static inline __be32
4628 check_special_stateids(struct net
*net
, svc_fh
*current_fh
, stateid_t
*stateid
, int flags
)
4630 if (ONE_STATEID(stateid
) && (flags
& RD_STATE
))
4632 else if (opens_in_grace(net
)) {
4633 /* Answer in remaining cases depends on existence of
4634 * conflicting state; so we must wait out the grace period. */
4635 return nfserr_grace
;
4636 } else if (flags
& WR_STATE
)
4637 return nfs4_share_conflict(current_fh
,
4638 NFS4_SHARE_DENY_WRITE
);
4639 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4640 return nfs4_share_conflict(current_fh
,
4641 NFS4_SHARE_DENY_READ
);
4645 * Allow READ/WRITE during grace period on recovered state only for files
4646 * that are not able to provide mandatory locking.
4649 grace_disallows_io(struct net
*net
, struct inode
*inode
)
4651 return opens_in_grace(net
) && mandatory_lock(inode
);
4654 static __be32
check_stateid_generation(stateid_t
*in
, stateid_t
*ref
, bool has_session
)
4657 * When sessions are used the stateid generation number is ignored
4660 if (has_session
&& in
->si_generation
== 0)
4663 if (in
->si_generation
== ref
->si_generation
)
4666 /* If the client sends us a stateid from the future, it's buggy: */
4667 if (nfsd4_stateid_generation_after(in
, ref
))
4668 return nfserr_bad_stateid
;
4670 * However, we could see a stateid from the past, even from a
4671 * non-buggy client. For example, if the client sends a lock
4672 * while some IO is outstanding, the lock may bump si_generation
4673 * while the IO is still in flight. The client could avoid that
4674 * situation by waiting for responses on all the IO requests,
4675 * but better performance may result in retrying IO that
4676 * receives an old_stateid error if requests are rarely
4677 * reordered in flight:
4679 return nfserr_old_stateid
;
4682 static __be32
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid
*ols
)
4684 if (ols
->st_stateowner
->so_is_open_owner
&&
4685 !(openowner(ols
->st_stateowner
)->oo_flags
& NFS4_OO_CONFIRMED
))
4686 return nfserr_bad_stateid
;
4690 static __be32
nfsd4_validate_stateid(struct nfs4_client
*cl
, stateid_t
*stateid
)
4692 struct nfs4_stid
*s
;
4693 __be32 status
= nfserr_bad_stateid
;
4695 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
))
4697 /* Client debugging aid. */
4698 if (!same_clid(&stateid
->si_opaque
.so_clid
, &cl
->cl_clientid
)) {
4699 char addr_str
[INET6_ADDRSTRLEN
];
4700 rpc_ntop((struct sockaddr
*)&cl
->cl_addr
, addr_str
,
4702 pr_warn_ratelimited("NFSD: client %s testing state ID "
4703 "with incorrect client ID\n", addr_str
);
4706 spin_lock(&cl
->cl_lock
);
4707 s
= find_stateid_locked(cl
, stateid
);
4710 status
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
4713 switch (s
->sc_type
) {
4714 case NFS4_DELEG_STID
:
4717 case NFS4_REVOKED_DELEG_STID
:
4718 status
= nfserr_deleg_revoked
;
4720 case NFS4_OPEN_STID
:
4721 case NFS4_LOCK_STID
:
4722 status
= nfsd4_check_openowner_confirmed(openlockstateid(s
));
4725 printk("unknown stateid type %x\n", s
->sc_type
);
4727 case NFS4_CLOSED_STID
:
4728 case NFS4_CLOSED_DELEG_STID
:
4729 status
= nfserr_bad_stateid
;
4732 spin_unlock(&cl
->cl_lock
);
4737 nfsd4_lookup_stateid(struct nfsd4_compound_state
*cstate
,
4738 stateid_t
*stateid
, unsigned char typemask
,
4739 struct nfs4_stid
**s
, struct nfsd_net
*nn
)
4743 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
))
4744 return nfserr_bad_stateid
;
4745 status
= lookup_clientid(&stateid
->si_opaque
.so_clid
, cstate
, nn
);
4746 if (status
== nfserr_stale_clientid
) {
4747 if (cstate
->session
)
4748 return nfserr_bad_stateid
;
4749 return nfserr_stale_stateid
;
4753 *s
= find_stateid_by_type(cstate
->clp
, stateid
, typemask
);
4755 return nfserr_bad_stateid
;
4759 static struct file
*
4760 nfs4_find_file(struct nfs4_stid
*s
, int flags
)
4765 switch (s
->sc_type
) {
4766 case NFS4_DELEG_STID
:
4767 if (WARN_ON_ONCE(!s
->sc_file
->fi_deleg_file
))
4769 return get_file(s
->sc_file
->fi_deleg_file
);
4770 case NFS4_OPEN_STID
:
4771 case NFS4_LOCK_STID
:
4772 if (flags
& RD_STATE
)
4773 return find_readable_file(s
->sc_file
);
4775 return find_writeable_file(s
->sc_file
);
4783 nfs4_check_olstateid(struct svc_fh
*fhp
, struct nfs4_ol_stateid
*ols
, int flags
)
4787 status
= nfsd4_check_openowner_confirmed(ols
);
4790 return nfs4_check_openmode(ols
, flags
);
4794 nfs4_check_file(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct nfs4_stid
*s
,
4795 struct file
**filpp
, bool *tmp_file
, int flags
)
4797 int acc
= (flags
& RD_STATE
) ? NFSD_MAY_READ
: NFSD_MAY_WRITE
;
4801 file
= nfs4_find_file(s
, flags
);
4803 status
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
4804 acc
| NFSD_MAY_OWNER_OVERRIDE
);
4812 status
= nfsd_open(rqstp
, fhp
, S_IFREG
, acc
, filpp
);
4824 * Checks for stateid operations
4827 nfs4_preprocess_stateid_op(struct svc_rqst
*rqstp
,
4828 struct nfsd4_compound_state
*cstate
, struct svc_fh
*fhp
,
4829 stateid_t
*stateid
, int flags
, struct file
**filpp
, bool *tmp_file
)
4831 struct inode
*ino
= d_inode(fhp
->fh_dentry
);
4832 struct net
*net
= SVC_NET(rqstp
);
4833 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
4834 struct nfs4_stid
*s
= NULL
;
4842 if (grace_disallows_io(net
, ino
))
4843 return nfserr_grace
;
4845 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
)) {
4846 status
= check_special_stateids(net
, fhp
, stateid
, flags
);
4850 status
= nfsd4_lookup_stateid(cstate
, stateid
,
4851 NFS4_DELEG_STID
|NFS4_OPEN_STID
|NFS4_LOCK_STID
,
4855 status
= check_stateid_generation(stateid
, &s
->sc_stateid
,
4856 nfsd4_has_session(cstate
));
4860 switch (s
->sc_type
) {
4861 case NFS4_DELEG_STID
:
4862 status
= nfs4_check_delegmode(delegstateid(s
), flags
);
4864 case NFS4_OPEN_STID
:
4865 case NFS4_LOCK_STID
:
4866 status
= nfs4_check_olstateid(fhp
, openlockstateid(s
), flags
);
4869 status
= nfserr_bad_stateid
;
4874 status
= nfs4_check_fh(fhp
, s
);
4877 if (!status
&& filpp
)
4878 status
= nfs4_check_file(rqstp
, fhp
, s
, filpp
, tmp_file
, flags
);
4886 * Test if the stateid is valid
4889 nfsd4_test_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
4890 struct nfsd4_test_stateid
*test_stateid
)
4892 struct nfsd4_test_stateid_id
*stateid
;
4893 struct nfs4_client
*cl
= cstate
->session
->se_client
;
4895 list_for_each_entry(stateid
, &test_stateid
->ts_stateid_list
, ts_id_list
)
4896 stateid
->ts_id_status
=
4897 nfsd4_validate_stateid(cl
, &stateid
->ts_id_stateid
);
4903 nfsd4_free_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
4904 struct nfsd4_free_stateid
*free_stateid
)
4906 stateid_t
*stateid
= &free_stateid
->fr_stateid
;
4907 struct nfs4_stid
*s
;
4908 struct nfs4_delegation
*dp
;
4909 struct nfs4_ol_stateid
*stp
;
4910 struct nfs4_client
*cl
= cstate
->session
->se_client
;
4911 __be32 ret
= nfserr_bad_stateid
;
4913 spin_lock(&cl
->cl_lock
);
4914 s
= find_stateid_locked(cl
, stateid
);
4917 switch (s
->sc_type
) {
4918 case NFS4_DELEG_STID
:
4919 ret
= nfserr_locks_held
;
4921 case NFS4_OPEN_STID
:
4922 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
4925 ret
= nfserr_locks_held
;
4927 case NFS4_LOCK_STID
:
4928 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
4931 stp
= openlockstateid(s
);
4932 ret
= nfserr_locks_held
;
4933 if (check_for_locks(stp
->st_stid
.sc_file
,
4934 lockowner(stp
->st_stateowner
)))
4936 WARN_ON(!unhash_lock_stateid(stp
));
4937 spin_unlock(&cl
->cl_lock
);
4941 case NFS4_REVOKED_DELEG_STID
:
4942 dp
= delegstateid(s
);
4943 list_del_init(&dp
->dl_recall_lru
);
4944 spin_unlock(&cl
->cl_lock
);
4948 /* Default falls through and returns nfserr_bad_stateid */
4951 spin_unlock(&cl
->cl_lock
);
4959 return (type
== NFS4_READW_LT
|| type
== NFS4_READ_LT
) ?
4960 RD_STATE
: WR_STATE
;
4963 static __be32
nfs4_seqid_op_checks(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
, u32 seqid
, struct nfs4_ol_stateid
*stp
)
4965 struct svc_fh
*current_fh
= &cstate
->current_fh
;
4966 struct nfs4_stateowner
*sop
= stp
->st_stateowner
;
4969 status
= nfsd4_check_seqid(cstate
, sop
, seqid
);
4972 if (stp
->st_stid
.sc_type
== NFS4_CLOSED_STID
4973 || stp
->st_stid
.sc_type
== NFS4_REVOKED_DELEG_STID
)
4975 * "Closed" stateid's exist *only* to return
4976 * nfserr_replay_me from the previous step, and
4977 * revoked delegations are kept only for free_stateid.
4979 return nfserr_bad_stateid
;
4980 mutex_lock(&stp
->st_mutex
);
4981 status
= check_stateid_generation(stateid
, &stp
->st_stid
.sc_stateid
, nfsd4_has_session(cstate
));
4982 if (status
== nfs_ok
)
4983 status
= nfs4_check_fh(current_fh
, &stp
->st_stid
);
4984 if (status
!= nfs_ok
)
4985 mutex_unlock(&stp
->st_mutex
);
4990 * Checks for sequence id mutating operations.
4993 nfs4_preprocess_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
4994 stateid_t
*stateid
, char typemask
,
4995 struct nfs4_ol_stateid
**stpp
,
4996 struct nfsd_net
*nn
)
4999 struct nfs4_stid
*s
;
5000 struct nfs4_ol_stateid
*stp
= NULL
;
5002 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT
"\n", __func__
,
5003 seqid
, STATEID_VAL(stateid
));
5006 status
= nfsd4_lookup_stateid(cstate
, stateid
, typemask
, &s
, nn
);
5009 stp
= openlockstateid(s
);
5010 nfsd4_cstate_assign_replay(cstate
, stp
->st_stateowner
);
5012 status
= nfs4_seqid_op_checks(cstate
, stateid
, seqid
, stp
);
5016 nfs4_put_stid(&stp
->st_stid
);
5020 static __be32
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
5021 stateid_t
*stateid
, struct nfs4_ol_stateid
**stpp
, struct nfsd_net
*nn
)
5024 struct nfs4_openowner
*oo
;
5025 struct nfs4_ol_stateid
*stp
;
5027 status
= nfs4_preprocess_seqid_op(cstate
, seqid
, stateid
,
5028 NFS4_OPEN_STID
, &stp
, nn
);
5031 oo
= openowner(stp
->st_stateowner
);
5032 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
5033 mutex_unlock(&stp
->st_mutex
);
5034 nfs4_put_stid(&stp
->st_stid
);
5035 return nfserr_bad_stateid
;
5042 nfsd4_open_confirm(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5043 struct nfsd4_open_confirm
*oc
)
5046 struct nfs4_openowner
*oo
;
5047 struct nfs4_ol_stateid
*stp
;
5048 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5050 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5051 cstate
->current_fh
.fh_dentry
);
5053 status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0);
5057 status
= nfs4_preprocess_seqid_op(cstate
,
5058 oc
->oc_seqid
, &oc
->oc_req_stateid
,
5059 NFS4_OPEN_STID
, &stp
, nn
);
5062 oo
= openowner(stp
->st_stateowner
);
5063 status
= nfserr_bad_stateid
;
5064 if (oo
->oo_flags
& NFS4_OO_CONFIRMED
) {
5065 mutex_unlock(&stp
->st_mutex
);
5068 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
5069 nfs4_inc_and_copy_stateid(&oc
->oc_resp_stateid
, &stp
->st_stid
);
5070 mutex_unlock(&stp
->st_mutex
);
5071 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT
"\n",
5072 __func__
, oc
->oc_seqid
, STATEID_VAL(&stp
->st_stid
.sc_stateid
));
5074 nfsd4_client_record_create(oo
->oo_owner
.so_client
);
5077 nfs4_put_stid(&stp
->st_stid
);
5079 nfsd4_bump_seqid(cstate
, status
);
5083 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid
*stp
, u32 access
)
5085 if (!test_access(access
, stp
))
5087 nfs4_file_put_access(stp
->st_stid
.sc_file
, access
);
5088 clear_access(access
, stp
);
5091 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid
*stp
, u32 to_access
)
5093 switch (to_access
) {
5094 case NFS4_SHARE_ACCESS_READ
:
5095 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_WRITE
);
5096 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5098 case NFS4_SHARE_ACCESS_WRITE
:
5099 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_READ
);
5100 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5102 case NFS4_SHARE_ACCESS_BOTH
:
5110 nfsd4_open_downgrade(struct svc_rqst
*rqstp
,
5111 struct nfsd4_compound_state
*cstate
,
5112 struct nfsd4_open_downgrade
*od
)
5115 struct nfs4_ol_stateid
*stp
;
5116 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5118 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5119 cstate
->current_fh
.fh_dentry
);
5121 /* We don't yet support WANT bits: */
5122 if (od
->od_deleg_want
)
5123 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__
,
5126 status
= nfs4_preprocess_confirmed_seqid_op(cstate
, od
->od_seqid
,
5127 &od
->od_stateid
, &stp
, nn
);
5130 status
= nfserr_inval
;
5131 if (!test_access(od
->od_share_access
, stp
)) {
5132 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5133 stp
->st_access_bmap
, od
->od_share_access
);
5136 if (!test_deny(od
->od_share_deny
, stp
)) {
5137 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5138 stp
->st_deny_bmap
, od
->od_share_deny
);
5141 nfs4_stateid_downgrade(stp
, od
->od_share_access
);
5142 reset_union_bmap_deny(od
->od_share_deny
, stp
);
5143 nfs4_inc_and_copy_stateid(&od
->od_stateid
, &stp
->st_stid
);
5146 mutex_unlock(&stp
->st_mutex
);
5147 nfs4_put_stid(&stp
->st_stid
);
5149 nfsd4_bump_seqid(cstate
, status
);
5153 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid
*s
)
5155 struct nfs4_client
*clp
= s
->st_stid
.sc_client
;
5157 LIST_HEAD(reaplist
);
5159 s
->st_stid
.sc_type
= NFS4_CLOSED_STID
;
5160 spin_lock(&clp
->cl_lock
);
5161 unhashed
= unhash_open_stateid(s
, &reaplist
);
5163 if (clp
->cl_minorversion
) {
5165 put_ol_stateid_locked(s
, &reaplist
);
5166 spin_unlock(&clp
->cl_lock
);
5167 free_ol_stateid_reaplist(&reaplist
);
5169 spin_unlock(&clp
->cl_lock
);
5170 free_ol_stateid_reaplist(&reaplist
);
5172 move_to_close_lru(s
, clp
->net
);
5177 * nfs4_unlock_state() called after encode
5180 nfsd4_close(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5181 struct nfsd4_close
*close
)
5184 struct nfs4_ol_stateid
*stp
;
5185 struct net
*net
= SVC_NET(rqstp
);
5186 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5188 dprintk("NFSD: nfsd4_close on file %pd\n",
5189 cstate
->current_fh
.fh_dentry
);
5191 status
= nfs4_preprocess_seqid_op(cstate
, close
->cl_seqid
,
5193 NFS4_OPEN_STID
|NFS4_CLOSED_STID
,
5195 nfsd4_bump_seqid(cstate
, status
);
5198 nfs4_inc_and_copy_stateid(&close
->cl_stateid
, &stp
->st_stid
);
5199 mutex_unlock(&stp
->st_mutex
);
5201 nfsd4_close_open_stateid(stp
);
5203 /* put reference from nfs4_preprocess_seqid_op */
5204 nfs4_put_stid(&stp
->st_stid
);
5210 nfsd4_delegreturn(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5211 struct nfsd4_delegreturn
*dr
)
5213 struct nfs4_delegation
*dp
;
5214 stateid_t
*stateid
= &dr
->dr_stateid
;
5215 struct nfs4_stid
*s
;
5217 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5219 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
5222 status
= nfsd4_lookup_stateid(cstate
, stateid
, NFS4_DELEG_STID
, &s
, nn
);
5225 dp
= delegstateid(s
);
5226 status
= check_stateid_generation(stateid
, &dp
->dl_stid
.sc_stateid
, nfsd4_has_session(cstate
));
5230 destroy_delegation(dp
);
5232 nfs4_put_stid(&dp
->dl_stid
);
5238 end_offset(u64 start
, u64 len
)
5243 return end
>= start
? end
: NFS4_MAX_UINT64
;
5246 /* last octet in a range */
5248 last_byte_offset(u64 start
, u64 len
)
5254 return end
> start
? end
- 1: NFS4_MAX_UINT64
;
5258 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5259 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5260 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5261 * locking, this prevents us from being completely protocol-compliant. The
5262 * real solution to this problem is to start using unsigned file offsets in
5263 * the VFS, but this is a very deep change!
5266 nfs4_transform_lock_offset(struct file_lock
*lock
)
5268 if (lock
->fl_start
< 0)
5269 lock
->fl_start
= OFFSET_MAX
;
5270 if (lock
->fl_end
< 0)
5271 lock
->fl_end
= OFFSET_MAX
;
5275 nfsd4_fl_get_owner(fl_owner_t owner
)
5277 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5279 nfs4_get_stateowner(&lo
->lo_owner
);
5284 nfsd4_fl_put_owner(fl_owner_t owner
)
5286 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5289 nfs4_put_stateowner(&lo
->lo_owner
);
5292 static const struct lock_manager_operations nfsd_posix_mng_ops
= {
5293 .lm_get_owner
= nfsd4_fl_get_owner
,
5294 .lm_put_owner
= nfsd4_fl_put_owner
,
5298 nfs4_set_lock_denied(struct file_lock
*fl
, struct nfsd4_lock_denied
*deny
)
5300 struct nfs4_lockowner
*lo
;
5302 if (fl
->fl_lmops
== &nfsd_posix_mng_ops
) {
5303 lo
= (struct nfs4_lockowner
*) fl
->fl_owner
;
5304 deny
->ld_owner
.data
= kmemdup(lo
->lo_owner
.so_owner
.data
,
5305 lo
->lo_owner
.so_owner
.len
, GFP_KERNEL
);
5306 if (!deny
->ld_owner
.data
)
5307 /* We just don't care that much */
5309 deny
->ld_owner
.len
= lo
->lo_owner
.so_owner
.len
;
5310 deny
->ld_clientid
= lo
->lo_owner
.so_client
->cl_clientid
;
5313 deny
->ld_owner
.len
= 0;
5314 deny
->ld_owner
.data
= NULL
;
5315 deny
->ld_clientid
.cl_boot
= 0;
5316 deny
->ld_clientid
.cl_id
= 0;
5318 deny
->ld_start
= fl
->fl_start
;
5319 deny
->ld_length
= NFS4_MAX_UINT64
;
5320 if (fl
->fl_end
!= NFS4_MAX_UINT64
)
5321 deny
->ld_length
= fl
->fl_end
- fl
->fl_start
+ 1;
5322 deny
->ld_type
= NFS4_READ_LT
;
5323 if (fl
->fl_type
!= F_RDLCK
)
5324 deny
->ld_type
= NFS4_WRITE_LT
;
5327 static struct nfs4_lockowner
*
5328 find_lockowner_str_locked(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5330 unsigned int strhashval
= ownerstr_hashval(owner
);
5331 struct nfs4_stateowner
*so
;
5333 lockdep_assert_held(&clp
->cl_lock
);
5335 list_for_each_entry(so
, &clp
->cl_ownerstr_hashtbl
[strhashval
],
5337 if (so
->so_is_open_owner
)
5339 if (same_owner_str(so
, owner
))
5340 return lockowner(nfs4_get_stateowner(so
));
5345 static struct nfs4_lockowner
*
5346 find_lockowner_str(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5348 struct nfs4_lockowner
*lo
;
5350 spin_lock(&clp
->cl_lock
);
5351 lo
= find_lockowner_str_locked(clp
, owner
);
5352 spin_unlock(&clp
->cl_lock
);
5356 static void nfs4_unhash_lockowner(struct nfs4_stateowner
*sop
)
5358 unhash_lockowner_locked(lockowner(sop
));
5361 static void nfs4_free_lockowner(struct nfs4_stateowner
*sop
)
5363 struct nfs4_lockowner
*lo
= lockowner(sop
);
5365 kmem_cache_free(lockowner_slab
, lo
);
5368 static const struct nfs4_stateowner_operations lockowner_ops
= {
5369 .so_unhash
= nfs4_unhash_lockowner
,
5370 .so_free
= nfs4_free_lockowner
,
5374 * Alloc a lock owner structure.
5375 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5378 * strhashval = ownerstr_hashval
5380 static struct nfs4_lockowner
*
5381 alloc_init_lock_stateowner(unsigned int strhashval
, struct nfs4_client
*clp
,
5382 struct nfs4_ol_stateid
*open_stp
,
5383 struct nfsd4_lock
*lock
)
5385 struct nfs4_lockowner
*lo
, *ret
;
5387 lo
= alloc_stateowner(lockowner_slab
, &lock
->lk_new_owner
, clp
);
5390 INIT_LIST_HEAD(&lo
->lo_owner
.so_stateids
);
5391 lo
->lo_owner
.so_is_open_owner
= 0;
5392 lo
->lo_owner
.so_seqid
= lock
->lk_new_lock_seqid
;
5393 lo
->lo_owner
.so_ops
= &lockowner_ops
;
5394 spin_lock(&clp
->cl_lock
);
5395 ret
= find_lockowner_str_locked(clp
, &lock
->lk_new_owner
);
5397 list_add(&lo
->lo_owner
.so_strhash
,
5398 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
5401 nfs4_free_stateowner(&lo
->lo_owner
);
5403 spin_unlock(&clp
->cl_lock
);
5408 init_lock_stateid(struct nfs4_ol_stateid
*stp
, struct nfs4_lockowner
*lo
,
5409 struct nfs4_file
*fp
, struct inode
*inode
,
5410 struct nfs4_ol_stateid
*open_stp
)
5412 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5414 lockdep_assert_held(&clp
->cl_lock
);
5416 atomic_inc(&stp
->st_stid
.sc_count
);
5417 stp
->st_stid
.sc_type
= NFS4_LOCK_STID
;
5418 stp
->st_stateowner
= nfs4_get_stateowner(&lo
->lo_owner
);
5420 stp
->st_stid
.sc_file
= fp
;
5421 stp
->st_stid
.sc_free
= nfs4_free_lock_stateid
;
5422 stp
->st_access_bmap
= 0;
5423 stp
->st_deny_bmap
= open_stp
->st_deny_bmap
;
5424 stp
->st_openstp
= open_stp
;
5425 mutex_init(&stp
->st_mutex
);
5426 list_add(&stp
->st_locks
, &open_stp
->st_locks
);
5427 list_add(&stp
->st_perstateowner
, &lo
->lo_owner
.so_stateids
);
5428 spin_lock(&fp
->fi_lock
);
5429 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
5430 spin_unlock(&fp
->fi_lock
);
5433 static struct nfs4_ol_stateid
*
5434 find_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fp
)
5436 struct nfs4_ol_stateid
*lst
;
5437 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5439 lockdep_assert_held(&clp
->cl_lock
);
5441 list_for_each_entry(lst
, &lo
->lo_owner
.so_stateids
, st_perstateowner
) {
5442 if (lst
->st_stid
.sc_file
== fp
) {
5443 atomic_inc(&lst
->st_stid
.sc_count
);
5450 static struct nfs4_ol_stateid
*
5451 find_or_create_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fi
,
5452 struct inode
*inode
, struct nfs4_ol_stateid
*ost
,
5455 struct nfs4_stid
*ns
= NULL
;
5456 struct nfs4_ol_stateid
*lst
;
5457 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5458 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
5460 spin_lock(&clp
->cl_lock
);
5461 lst
= find_lock_stateid(lo
, fi
);
5463 spin_unlock(&clp
->cl_lock
);
5464 ns
= nfs4_alloc_stid(clp
, stateid_slab
);
5468 spin_lock(&clp
->cl_lock
);
5469 lst
= find_lock_stateid(lo
, fi
);
5471 lst
= openlockstateid(ns
);
5472 init_lock_stateid(lst
, lo
, fi
, inode
, ost
);
5477 spin_unlock(&clp
->cl_lock
);
5484 check_lock_length(u64 offset
, u64 length
)
5486 return ((length
== 0) || ((length
!= NFS4_MAX_UINT64
) &&
5487 (length
> ~offset
)));
5490 static void get_lock_access(struct nfs4_ol_stateid
*lock_stp
, u32 access
)
5492 struct nfs4_file
*fp
= lock_stp
->st_stid
.sc_file
;
5494 lockdep_assert_held(&fp
->fi_lock
);
5496 if (test_access(access
, lock_stp
))
5498 __nfs4_file_get_access(fp
, access
);
5499 set_access(access
, lock_stp
);
5503 lookup_or_create_lock_state(struct nfsd4_compound_state
*cstate
,
5504 struct nfs4_ol_stateid
*ost
,
5505 struct nfsd4_lock
*lock
,
5506 struct nfs4_ol_stateid
**lst
, bool *new)
5509 struct nfs4_file
*fi
= ost
->st_stid
.sc_file
;
5510 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5511 struct nfs4_client
*cl
= oo
->oo_owner
.so_client
;
5512 struct inode
*inode
= d_inode(cstate
->current_fh
.fh_dentry
);
5513 struct nfs4_lockowner
*lo
;
5514 unsigned int strhashval
;
5516 lo
= find_lockowner_str(cl
, &lock
->lk_new_owner
);
5518 strhashval
= ownerstr_hashval(&lock
->lk_new_owner
);
5519 lo
= alloc_init_lock_stateowner(strhashval
, cl
, ost
, lock
);
5521 return nfserr_jukebox
;
5523 /* with an existing lockowner, seqids must be the same */
5524 status
= nfserr_bad_seqid
;
5525 if (!cstate
->minorversion
&&
5526 lock
->lk_new_lock_seqid
!= lo
->lo_owner
.so_seqid
)
5530 *lst
= find_or_create_lock_stateid(lo
, fi
, inode
, ost
, new);
5532 status
= nfserr_jukebox
;
5537 nfs4_put_stateowner(&lo
->lo_owner
);
5545 nfsd4_lock(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5546 struct nfsd4_lock
*lock
)
5548 struct nfs4_openowner
*open_sop
= NULL
;
5549 struct nfs4_lockowner
*lock_sop
= NULL
;
5550 struct nfs4_ol_stateid
*lock_stp
= NULL
;
5551 struct nfs4_ol_stateid
*open_stp
= NULL
;
5552 struct nfs4_file
*fp
;
5553 struct file
*filp
= NULL
;
5554 struct file_lock
*file_lock
= NULL
;
5555 struct file_lock
*conflock
= NULL
;
5560 struct net
*net
= SVC_NET(rqstp
);
5561 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5563 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5564 (long long) lock
->lk_offset
,
5565 (long long) lock
->lk_length
);
5567 if (check_lock_length(lock
->lk_offset
, lock
->lk_length
))
5568 return nfserr_inval
;
5570 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
,
5571 S_IFREG
, NFSD_MAY_LOCK
))) {
5572 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5576 if (lock
->lk_is_new
) {
5577 if (nfsd4_has_session(cstate
))
5578 /* See rfc 5661 18.10.3: given clientid is ignored: */
5579 memcpy(&lock
->lk_new_clientid
,
5580 &cstate
->session
->se_client
->cl_clientid
,
5581 sizeof(clientid_t
));
5583 status
= nfserr_stale_clientid
;
5584 if (STALE_CLIENTID(&lock
->lk_new_clientid
, nn
))
5587 /* validate and update open stateid and open seqid */
5588 status
= nfs4_preprocess_confirmed_seqid_op(cstate
,
5589 lock
->lk_new_open_seqid
,
5590 &lock
->lk_new_open_stateid
,
5594 mutex_unlock(&open_stp
->st_mutex
);
5595 open_sop
= openowner(open_stp
->st_stateowner
);
5596 status
= nfserr_bad_stateid
;
5597 if (!same_clid(&open_sop
->oo_owner
.so_client
->cl_clientid
,
5598 &lock
->lk_new_clientid
))
5600 status
= lookup_or_create_lock_state(cstate
, open_stp
, lock
,
5602 if (status
== nfs_ok
)
5603 mutex_lock(&lock_stp
->st_mutex
);
5605 status
= nfs4_preprocess_seqid_op(cstate
,
5606 lock
->lk_old_lock_seqid
,
5607 &lock
->lk_old_lock_stateid
,
5608 NFS4_LOCK_STID
, &lock_stp
, nn
);
5612 lock_sop
= lockowner(lock_stp
->st_stateowner
);
5614 lkflg
= setlkflg(lock
->lk_type
);
5615 status
= nfs4_check_openmode(lock_stp
, lkflg
);
5619 status
= nfserr_grace
;
5620 if (locks_in_grace(net
) && !lock
->lk_reclaim
)
5622 status
= nfserr_no_grace
;
5623 if (!locks_in_grace(net
) && lock
->lk_reclaim
)
5626 file_lock
= locks_alloc_lock();
5628 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
5629 status
= nfserr_jukebox
;
5633 fp
= lock_stp
->st_stid
.sc_file
;
5634 switch (lock
->lk_type
) {
5637 spin_lock(&fp
->fi_lock
);
5638 filp
= find_readable_file_locked(fp
);
5640 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_READ
);
5641 spin_unlock(&fp
->fi_lock
);
5642 file_lock
->fl_type
= F_RDLCK
;
5645 case NFS4_WRITEW_LT
:
5646 spin_lock(&fp
->fi_lock
);
5647 filp
= find_writeable_file_locked(fp
);
5649 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_WRITE
);
5650 spin_unlock(&fp
->fi_lock
);
5651 file_lock
->fl_type
= F_WRLCK
;
5654 status
= nfserr_inval
;
5658 status
= nfserr_openmode
;
5662 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(&lock_sop
->lo_owner
));
5663 file_lock
->fl_pid
= current
->tgid
;
5664 file_lock
->fl_file
= filp
;
5665 file_lock
->fl_flags
= FL_POSIX
;
5666 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
5667 file_lock
->fl_start
= lock
->lk_offset
;
5668 file_lock
->fl_end
= last_byte_offset(lock
->lk_offset
, lock
->lk_length
);
5669 nfs4_transform_lock_offset(file_lock
);
5671 conflock
= locks_alloc_lock();
5673 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
5674 status
= nfserr_jukebox
;
5678 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, conflock
);
5680 case 0: /* success! */
5681 nfs4_inc_and_copy_stateid(&lock
->lk_resp_stateid
, &lock_stp
->st_stid
);
5684 case (EAGAIN
): /* conflock holds conflicting lock */
5685 status
= nfserr_denied
;
5686 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
5687 nfs4_set_lock_denied(conflock
, &lock
->lk_denied
);
5690 status
= nfserr_deadlock
;
5693 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err
);
5694 status
= nfserrno(err
);
5701 /* Bump seqid manually if the 4.0 replay owner is openowner */
5702 if (cstate
->replay_owner
&&
5703 cstate
->replay_owner
!= &lock_sop
->lo_owner
&&
5704 seqid_mutating_err(ntohl(status
)))
5705 lock_sop
->lo_owner
.so_seqid
++;
5707 mutex_unlock(&lock_stp
->st_mutex
);
5710 * If this is a new, never-before-used stateid, and we are
5711 * returning an error, then just go ahead and release it.
5714 release_lock_stateid(lock_stp
);
5716 nfs4_put_stid(&lock_stp
->st_stid
);
5719 nfs4_put_stid(&open_stp
->st_stid
);
5720 nfsd4_bump_seqid(cstate
, status
);
5722 locks_free_lock(file_lock
);
5724 locks_free_lock(conflock
);
5729 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
5730 * so we do a temporary open here just to get an open file to pass to
5731 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
5734 static __be32
nfsd_test_lock(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file_lock
*lock
)
5737 __be32 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
5739 err
= nfserrno(vfs_test_lock(file
, lock
));
5749 nfsd4_lockt(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5750 struct nfsd4_lockt
*lockt
)
5752 struct file_lock
*file_lock
= NULL
;
5753 struct nfs4_lockowner
*lo
= NULL
;
5755 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5757 if (locks_in_grace(SVC_NET(rqstp
)))
5758 return nfserr_grace
;
5760 if (check_lock_length(lockt
->lt_offset
, lockt
->lt_length
))
5761 return nfserr_inval
;
5763 if (!nfsd4_has_session(cstate
)) {
5764 status
= lookup_clientid(&lockt
->lt_clientid
, cstate
, nn
);
5769 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
5772 file_lock
= locks_alloc_lock();
5774 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
5775 status
= nfserr_jukebox
;
5779 switch (lockt
->lt_type
) {
5782 file_lock
->fl_type
= F_RDLCK
;
5785 case NFS4_WRITEW_LT
:
5786 file_lock
->fl_type
= F_WRLCK
;
5789 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
5790 status
= nfserr_inval
;
5794 lo
= find_lockowner_str(cstate
->clp
, &lockt
->lt_owner
);
5796 file_lock
->fl_owner
= (fl_owner_t
)lo
;
5797 file_lock
->fl_pid
= current
->tgid
;
5798 file_lock
->fl_flags
= FL_POSIX
;
5800 file_lock
->fl_start
= lockt
->lt_offset
;
5801 file_lock
->fl_end
= last_byte_offset(lockt
->lt_offset
, lockt
->lt_length
);
5803 nfs4_transform_lock_offset(file_lock
);
5805 status
= nfsd_test_lock(rqstp
, &cstate
->current_fh
, file_lock
);
5809 if (file_lock
->fl_type
!= F_UNLCK
) {
5810 status
= nfserr_denied
;
5811 nfs4_set_lock_denied(file_lock
, &lockt
->lt_denied
);
5815 nfs4_put_stateowner(&lo
->lo_owner
);
5817 locks_free_lock(file_lock
);
5822 nfsd4_locku(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5823 struct nfsd4_locku
*locku
)
5825 struct nfs4_ol_stateid
*stp
;
5826 struct file
*filp
= NULL
;
5827 struct file_lock
*file_lock
= NULL
;
5830 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5832 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
5833 (long long) locku
->lu_offset
,
5834 (long long) locku
->lu_length
);
5836 if (check_lock_length(locku
->lu_offset
, locku
->lu_length
))
5837 return nfserr_inval
;
5839 status
= nfs4_preprocess_seqid_op(cstate
, locku
->lu_seqid
,
5840 &locku
->lu_stateid
, NFS4_LOCK_STID
,
5844 filp
= find_any_file(stp
->st_stid
.sc_file
);
5846 status
= nfserr_lock_range
;
5849 file_lock
= locks_alloc_lock();
5851 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
5852 status
= nfserr_jukebox
;
5856 file_lock
->fl_type
= F_UNLCK
;
5857 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(stp
->st_stateowner
));
5858 file_lock
->fl_pid
= current
->tgid
;
5859 file_lock
->fl_file
= filp
;
5860 file_lock
->fl_flags
= FL_POSIX
;
5861 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
5862 file_lock
->fl_start
= locku
->lu_offset
;
5864 file_lock
->fl_end
= last_byte_offset(locku
->lu_offset
,
5866 nfs4_transform_lock_offset(file_lock
);
5868 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, NULL
);
5870 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
5873 nfs4_inc_and_copy_stateid(&locku
->lu_stateid
, &stp
->st_stid
);
5877 mutex_unlock(&stp
->st_mutex
);
5878 nfs4_put_stid(&stp
->st_stid
);
5880 nfsd4_bump_seqid(cstate
, status
);
5882 locks_free_lock(file_lock
);
5886 status
= nfserrno(err
);
5892 * true: locks held by lockowner
5893 * false: no locks held by lockowner
5896 check_for_locks(struct nfs4_file
*fp
, struct nfs4_lockowner
*lowner
)
5898 struct file_lock
*fl
;
5900 struct file
*filp
= find_any_file(fp
);
5901 struct inode
*inode
;
5902 struct file_lock_context
*flctx
;
5905 /* Any valid lock stateid should have some sort of access */
5910 inode
= file_inode(filp
);
5911 flctx
= inode
->i_flctx
;
5913 if (flctx
&& !list_empty_careful(&flctx
->flc_posix
)) {
5914 spin_lock(&flctx
->flc_lock
);
5915 list_for_each_entry(fl
, &flctx
->flc_posix
, fl_list
) {
5916 if (fl
->fl_owner
== (fl_owner_t
)lowner
) {
5921 spin_unlock(&flctx
->flc_lock
);
5928 nfsd4_release_lockowner(struct svc_rqst
*rqstp
,
5929 struct nfsd4_compound_state
*cstate
,
5930 struct nfsd4_release_lockowner
*rlockowner
)
5932 clientid_t
*clid
= &rlockowner
->rl_clientid
;
5933 struct nfs4_stateowner
*sop
;
5934 struct nfs4_lockowner
*lo
= NULL
;
5935 struct nfs4_ol_stateid
*stp
;
5936 struct xdr_netobj
*owner
= &rlockowner
->rl_owner
;
5937 unsigned int hashval
= ownerstr_hashval(owner
);
5939 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5940 struct nfs4_client
*clp
;
5942 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
5943 clid
->cl_boot
, clid
->cl_id
);
5945 status
= lookup_clientid(clid
, cstate
, nn
);
5950 /* Find the matching lock stateowner */
5951 spin_lock(&clp
->cl_lock
);
5952 list_for_each_entry(sop
, &clp
->cl_ownerstr_hashtbl
[hashval
],
5955 if (sop
->so_is_open_owner
|| !same_owner_str(sop
, owner
))
5958 /* see if there are still any locks associated with it */
5959 lo
= lockowner(sop
);
5960 list_for_each_entry(stp
, &sop
->so_stateids
, st_perstateowner
) {
5961 if (check_for_locks(stp
->st_stid
.sc_file
, lo
)) {
5962 status
= nfserr_locks_held
;
5963 spin_unlock(&clp
->cl_lock
);
5968 nfs4_get_stateowner(sop
);
5971 spin_unlock(&clp
->cl_lock
);
5973 release_lockowner(lo
);
5977 static inline struct nfs4_client_reclaim
*
5980 return kmalloc(sizeof(struct nfs4_client_reclaim
), GFP_KERNEL
);
5984 nfs4_has_reclaimed_state(const char *name
, struct nfsd_net
*nn
)
5986 struct nfs4_client_reclaim
*crp
;
5988 crp
= nfsd4_find_reclaim_client(name
, nn
);
5989 return (crp
&& crp
->cr_clp
);
5993 * failure => all reset bets are off, nfserr_no_grace...
5995 struct nfs4_client_reclaim
*
5996 nfs4_client_to_reclaim(const char *name
, struct nfsd_net
*nn
)
5998 unsigned int strhashval
;
5999 struct nfs4_client_reclaim
*crp
;
6001 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN
, name
);
6002 crp
= alloc_reclaim();
6004 strhashval
= clientstr_hashval(name
);
6005 INIT_LIST_HEAD(&crp
->cr_strhash
);
6006 list_add(&crp
->cr_strhash
, &nn
->reclaim_str_hashtbl
[strhashval
]);
6007 memcpy(crp
->cr_recdir
, name
, HEXDIR_LEN
);
6009 nn
->reclaim_str_hashtbl_size
++;
6015 nfs4_remove_reclaim_record(struct nfs4_client_reclaim
*crp
, struct nfsd_net
*nn
)
6017 list_del(&crp
->cr_strhash
);
6019 nn
->reclaim_str_hashtbl_size
--;
6023 nfs4_release_reclaim(struct nfsd_net
*nn
)
6025 struct nfs4_client_reclaim
*crp
= NULL
;
6028 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6029 while (!list_empty(&nn
->reclaim_str_hashtbl
[i
])) {
6030 crp
= list_entry(nn
->reclaim_str_hashtbl
[i
].next
,
6031 struct nfs4_client_reclaim
, cr_strhash
);
6032 nfs4_remove_reclaim_record(crp
, nn
);
6035 WARN_ON_ONCE(nn
->reclaim_str_hashtbl_size
);
6039 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6040 struct nfs4_client_reclaim
*
6041 nfsd4_find_reclaim_client(const char *recdir
, struct nfsd_net
*nn
)
6043 unsigned int strhashval
;
6044 struct nfs4_client_reclaim
*crp
= NULL
;
6046 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir
);
6048 strhashval
= clientstr_hashval(recdir
);
6049 list_for_each_entry(crp
, &nn
->reclaim_str_hashtbl
[strhashval
], cr_strhash
) {
6050 if (same_name(crp
->cr_recdir
, recdir
)) {
6058 * Called from OPEN. Look for clientid in reclaim list.
6061 nfs4_check_open_reclaim(clientid_t
*clid
,
6062 struct nfsd4_compound_state
*cstate
,
6063 struct nfsd_net
*nn
)
6067 /* find clientid in conf_id_hashtbl */
6068 status
= lookup_clientid(clid
, cstate
, nn
);
6070 return nfserr_reclaim_bad
;
6072 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
, &cstate
->clp
->cl_flags
))
6073 return nfserr_no_grace
;
6075 if (nfsd4_client_record_check(cstate
->clp
))
6076 return nfserr_reclaim_bad
;
6081 #ifdef CONFIG_NFSD_FAULT_INJECTION
6083 put_client(struct nfs4_client
*clp
)
6085 atomic_dec(&clp
->cl_refcount
);
6088 static struct nfs4_client
*
6089 nfsd_find_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6091 struct nfs4_client
*clp
;
6092 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6095 if (!nfsd_netns_ready(nn
))
6098 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6099 if (memcmp(&clp
->cl_addr
, addr
, addr_size
) == 0)
6106 nfsd_inject_print_clients(void)
6108 struct nfs4_client
*clp
;
6110 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6112 char buf
[INET6_ADDRSTRLEN
];
6114 if (!nfsd_netns_ready(nn
))
6117 spin_lock(&nn
->client_lock
);
6118 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6119 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6120 pr_info("NFS Client: %s\n", buf
);
6123 spin_unlock(&nn
->client_lock
);
6129 nfsd_inject_forget_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6132 struct nfs4_client
*clp
;
6133 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6136 if (!nfsd_netns_ready(nn
))
6139 spin_lock(&nn
->client_lock
);
6140 clp
= nfsd_find_client(addr
, addr_size
);
6142 if (mark_client_expired_locked(clp
) == nfs_ok
)
6147 spin_unlock(&nn
->client_lock
);
6156 nfsd_inject_forget_clients(u64 max
)
6159 struct nfs4_client
*clp
, *next
;
6160 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6162 LIST_HEAD(reaplist
);
6164 if (!nfsd_netns_ready(nn
))
6167 spin_lock(&nn
->client_lock
);
6168 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
6169 if (mark_client_expired_locked(clp
) == nfs_ok
) {
6170 list_add(&clp
->cl_lru
, &reaplist
);
6171 if (max
!= 0 && ++count
>= max
)
6175 spin_unlock(&nn
->client_lock
);
6177 list_for_each_entry_safe(clp
, next
, &reaplist
, cl_lru
)
6183 static void nfsd_print_count(struct nfs4_client
*clp
, unsigned int count
,
6186 char buf
[INET6_ADDRSTRLEN
];
6187 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6188 printk(KERN_INFO
"NFS Client: %s has %u %s\n", buf
, count
, type
);
6192 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid
*lst
,
6193 struct list_head
*collect
)
6195 struct nfs4_client
*clp
= lst
->st_stid
.sc_client
;
6196 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6202 lockdep_assert_held(&nn
->client_lock
);
6203 atomic_inc(&clp
->cl_refcount
);
6204 list_add(&lst
->st_locks
, collect
);
6207 static u64
nfsd_foreach_client_lock(struct nfs4_client
*clp
, u64 max
,
6208 struct list_head
*collect
,
6209 bool (*func
)(struct nfs4_ol_stateid
*))
6211 struct nfs4_openowner
*oop
;
6212 struct nfs4_ol_stateid
*stp
, *st_next
;
6213 struct nfs4_ol_stateid
*lst
, *lst_next
;
6216 spin_lock(&clp
->cl_lock
);
6217 list_for_each_entry(oop
, &clp
->cl_openowners
, oo_perclient
) {
6218 list_for_each_entry_safe(stp
, st_next
,
6219 &oop
->oo_owner
.so_stateids
, st_perstateowner
) {
6220 list_for_each_entry_safe(lst
, lst_next
,
6221 &stp
->st_locks
, st_locks
) {
6224 nfsd_inject_add_lock_to_list(lst
,
6229 * Despite the fact that these functions deal
6230 * with 64-bit integers for "count", we must
6231 * ensure that it doesn't blow up the
6232 * clp->cl_refcount. Throw a warning if we
6233 * start to approach INT_MAX here.
6235 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6242 spin_unlock(&clp
->cl_lock
);
6248 nfsd_collect_client_locks(struct nfs4_client
*clp
, struct list_head
*collect
,
6251 return nfsd_foreach_client_lock(clp
, max
, collect
, unhash_lock_stateid
);
6255 nfsd_print_client_locks(struct nfs4_client
*clp
)
6257 u64 count
= nfsd_foreach_client_lock(clp
, 0, NULL
, NULL
);
6258 nfsd_print_count(clp
, count
, "locked files");
6263 nfsd_inject_print_locks(void)
6265 struct nfs4_client
*clp
;
6267 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6270 if (!nfsd_netns_ready(nn
))
6273 spin_lock(&nn
->client_lock
);
6274 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6275 count
+= nfsd_print_client_locks(clp
);
6276 spin_unlock(&nn
->client_lock
);
6282 nfsd_reap_locks(struct list_head
*reaplist
)
6284 struct nfs4_client
*clp
;
6285 struct nfs4_ol_stateid
*stp
, *next
;
6287 list_for_each_entry_safe(stp
, next
, reaplist
, st_locks
) {
6288 list_del_init(&stp
->st_locks
);
6289 clp
= stp
->st_stid
.sc_client
;
6290 nfs4_put_stid(&stp
->st_stid
);
6296 nfsd_inject_forget_client_locks(struct sockaddr_storage
*addr
, size_t addr_size
)
6298 unsigned int count
= 0;
6299 struct nfs4_client
*clp
;
6300 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6302 LIST_HEAD(reaplist
);
6304 if (!nfsd_netns_ready(nn
))
6307 spin_lock(&nn
->client_lock
);
6308 clp
= nfsd_find_client(addr
, addr_size
);
6310 count
= nfsd_collect_client_locks(clp
, &reaplist
, 0);
6311 spin_unlock(&nn
->client_lock
);
6312 nfsd_reap_locks(&reaplist
);
6317 nfsd_inject_forget_locks(u64 max
)
6320 struct nfs4_client
*clp
;
6321 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6323 LIST_HEAD(reaplist
);
6325 if (!nfsd_netns_ready(nn
))
6328 spin_lock(&nn
->client_lock
);
6329 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6330 count
+= nfsd_collect_client_locks(clp
, &reaplist
, max
- count
);
6331 if (max
!= 0 && count
>= max
)
6334 spin_unlock(&nn
->client_lock
);
6335 nfsd_reap_locks(&reaplist
);
6340 nfsd_foreach_client_openowner(struct nfs4_client
*clp
, u64 max
,
6341 struct list_head
*collect
,
6342 void (*func
)(struct nfs4_openowner
*))
6344 struct nfs4_openowner
*oop
, *next
;
6345 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6349 lockdep_assert_held(&nn
->client_lock
);
6351 spin_lock(&clp
->cl_lock
);
6352 list_for_each_entry_safe(oop
, next
, &clp
->cl_openowners
, oo_perclient
) {
6356 atomic_inc(&clp
->cl_refcount
);
6357 list_add(&oop
->oo_perclient
, collect
);
6362 * Despite the fact that these functions deal with
6363 * 64-bit integers for "count", we must ensure that
6364 * it doesn't blow up the clp->cl_refcount. Throw a
6365 * warning if we start to approach INT_MAX here.
6367 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6371 spin_unlock(&clp
->cl_lock
);
6377 nfsd_print_client_openowners(struct nfs4_client
*clp
)
6379 u64 count
= nfsd_foreach_client_openowner(clp
, 0, NULL
, NULL
);
6381 nfsd_print_count(clp
, count
, "openowners");
6386 nfsd_collect_client_openowners(struct nfs4_client
*clp
,
6387 struct list_head
*collect
, u64 max
)
6389 return nfsd_foreach_client_openowner(clp
, max
, collect
,
6390 unhash_openowner_locked
);
6394 nfsd_inject_print_openowners(void)
6396 struct nfs4_client
*clp
;
6398 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6401 if (!nfsd_netns_ready(nn
))
6404 spin_lock(&nn
->client_lock
);
6405 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6406 count
+= nfsd_print_client_openowners(clp
);
6407 spin_unlock(&nn
->client_lock
);
6413 nfsd_reap_openowners(struct list_head
*reaplist
)
6415 struct nfs4_client
*clp
;
6416 struct nfs4_openowner
*oop
, *next
;
6418 list_for_each_entry_safe(oop
, next
, reaplist
, oo_perclient
) {
6419 list_del_init(&oop
->oo_perclient
);
6420 clp
= oop
->oo_owner
.so_client
;
6421 release_openowner(oop
);
6427 nfsd_inject_forget_client_openowners(struct sockaddr_storage
*addr
,
6430 unsigned int count
= 0;
6431 struct nfs4_client
*clp
;
6432 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6434 LIST_HEAD(reaplist
);
6436 if (!nfsd_netns_ready(nn
))
6439 spin_lock(&nn
->client_lock
);
6440 clp
= nfsd_find_client(addr
, addr_size
);
6442 count
= nfsd_collect_client_openowners(clp
, &reaplist
, 0);
6443 spin_unlock(&nn
->client_lock
);
6444 nfsd_reap_openowners(&reaplist
);
6449 nfsd_inject_forget_openowners(u64 max
)
6452 struct nfs4_client
*clp
;
6453 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6455 LIST_HEAD(reaplist
);
6457 if (!nfsd_netns_ready(nn
))
6460 spin_lock(&nn
->client_lock
);
6461 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6462 count
+= nfsd_collect_client_openowners(clp
, &reaplist
,
6464 if (max
!= 0 && count
>= max
)
6467 spin_unlock(&nn
->client_lock
);
6468 nfsd_reap_openowners(&reaplist
);
6472 static u64
nfsd_find_all_delegations(struct nfs4_client
*clp
, u64 max
,
6473 struct list_head
*victims
)
6475 struct nfs4_delegation
*dp
, *next
;
6476 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6480 lockdep_assert_held(&nn
->client_lock
);
6482 spin_lock(&state_lock
);
6483 list_for_each_entry_safe(dp
, next
, &clp
->cl_delegations
, dl_perclnt
) {
6486 * It's not safe to mess with delegations that have a
6487 * non-zero dl_time. They might have already been broken
6488 * and could be processed by the laundromat outside of
6489 * the state_lock. Just leave them be.
6491 if (dp
->dl_time
!= 0)
6494 atomic_inc(&clp
->cl_refcount
);
6495 WARN_ON(!unhash_delegation_locked(dp
));
6496 list_add(&dp
->dl_recall_lru
, victims
);
6500 * Despite the fact that these functions deal with
6501 * 64-bit integers for "count", we must ensure that
6502 * it doesn't blow up the clp->cl_refcount. Throw a
6503 * warning if we start to approach INT_MAX here.
6505 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6509 spin_unlock(&state_lock
);
6514 nfsd_print_client_delegations(struct nfs4_client
*clp
)
6516 u64 count
= nfsd_find_all_delegations(clp
, 0, NULL
);
6518 nfsd_print_count(clp
, count
, "delegations");
6523 nfsd_inject_print_delegations(void)
6525 struct nfs4_client
*clp
;
6527 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6530 if (!nfsd_netns_ready(nn
))
6533 spin_lock(&nn
->client_lock
);
6534 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6535 count
+= nfsd_print_client_delegations(clp
);
6536 spin_unlock(&nn
->client_lock
);
6542 nfsd_forget_delegations(struct list_head
*reaplist
)
6544 struct nfs4_client
*clp
;
6545 struct nfs4_delegation
*dp
, *next
;
6547 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
6548 list_del_init(&dp
->dl_recall_lru
);
6549 clp
= dp
->dl_stid
.sc_client
;
6550 revoke_delegation(dp
);
6556 nfsd_inject_forget_client_delegations(struct sockaddr_storage
*addr
,
6560 struct nfs4_client
*clp
;
6561 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6563 LIST_HEAD(reaplist
);
6565 if (!nfsd_netns_ready(nn
))
6568 spin_lock(&nn
->client_lock
);
6569 clp
= nfsd_find_client(addr
, addr_size
);
6571 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
6572 spin_unlock(&nn
->client_lock
);
6574 nfsd_forget_delegations(&reaplist
);
6579 nfsd_inject_forget_delegations(u64 max
)
6582 struct nfs4_client
*clp
;
6583 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6585 LIST_HEAD(reaplist
);
6587 if (!nfsd_netns_ready(nn
))
6590 spin_lock(&nn
->client_lock
);
6591 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6592 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
6593 if (max
!= 0 && count
>= max
)
6596 spin_unlock(&nn
->client_lock
);
6597 nfsd_forget_delegations(&reaplist
);
6602 nfsd_recall_delegations(struct list_head
*reaplist
)
6604 struct nfs4_client
*clp
;
6605 struct nfs4_delegation
*dp
, *next
;
6607 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
6608 list_del_init(&dp
->dl_recall_lru
);
6609 clp
= dp
->dl_stid
.sc_client
;
6611 * We skipped all entries that had a zero dl_time before,
6612 * so we can now reset the dl_time back to 0. If a delegation
6613 * break comes in now, then it won't make any difference since
6614 * we're recalling it either way.
6616 spin_lock(&state_lock
);
6618 spin_unlock(&state_lock
);
6619 nfsd_break_one_deleg(dp
);
6625 nfsd_inject_recall_client_delegations(struct sockaddr_storage
*addr
,
6629 struct nfs4_client
*clp
;
6630 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6632 LIST_HEAD(reaplist
);
6634 if (!nfsd_netns_ready(nn
))
6637 spin_lock(&nn
->client_lock
);
6638 clp
= nfsd_find_client(addr
, addr_size
);
6640 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
6641 spin_unlock(&nn
->client_lock
);
6643 nfsd_recall_delegations(&reaplist
);
6648 nfsd_inject_recall_delegations(u64 max
)
6651 struct nfs4_client
*clp
, *next
;
6652 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6654 LIST_HEAD(reaplist
);
6656 if (!nfsd_netns_ready(nn
))
6659 spin_lock(&nn
->client_lock
);
6660 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
6661 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
6662 if (max
!= 0 && ++count
>= max
)
6665 spin_unlock(&nn
->client_lock
);
6666 nfsd_recall_delegations(&reaplist
);
6669 #endif /* CONFIG_NFSD_FAULT_INJECTION */
6672 * Since the lifetime of a delegation isn't limited to that of an open, a
6673 * client may quite reasonably hang on to a delegation as long as it has
6674 * the inode cached. This becomes an obvious problem the first time a
6675 * client's inode cache approaches the size of the server's total memory.
6677 * For now we avoid this problem by imposing a hard limit on the number
6678 * of delegations, which varies according to the server's memory size.
6681 set_max_delegations(void)
6684 * Allow at most 4 delegations per megabyte of RAM. Quick
6685 * estimates suggest that in the worst case (where every delegation
6686 * is for a different inode), a delegation could take about 1.5K,
6687 * giving a worst case usage of about 6% of memory.
6689 max_delegations
= nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT
);
6692 static int nfs4_state_create_net(struct net
*net
)
6694 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
6697 nn
->conf_id_hashtbl
= kmalloc(sizeof(struct list_head
) *
6698 CLIENT_HASH_SIZE
, GFP_KERNEL
);
6699 if (!nn
->conf_id_hashtbl
)
6701 nn
->unconf_id_hashtbl
= kmalloc(sizeof(struct list_head
) *
6702 CLIENT_HASH_SIZE
, GFP_KERNEL
);
6703 if (!nn
->unconf_id_hashtbl
)
6705 nn
->sessionid_hashtbl
= kmalloc(sizeof(struct list_head
) *
6706 SESSION_HASH_SIZE
, GFP_KERNEL
);
6707 if (!nn
->sessionid_hashtbl
)
6710 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6711 INIT_LIST_HEAD(&nn
->conf_id_hashtbl
[i
]);
6712 INIT_LIST_HEAD(&nn
->unconf_id_hashtbl
[i
]);
6714 for (i
= 0; i
< SESSION_HASH_SIZE
; i
++)
6715 INIT_LIST_HEAD(&nn
->sessionid_hashtbl
[i
]);
6716 nn
->conf_name_tree
= RB_ROOT
;
6717 nn
->unconf_name_tree
= RB_ROOT
;
6718 INIT_LIST_HEAD(&nn
->client_lru
);
6719 INIT_LIST_HEAD(&nn
->close_lru
);
6720 INIT_LIST_HEAD(&nn
->del_recall_lru
);
6721 spin_lock_init(&nn
->client_lock
);
6723 INIT_DELAYED_WORK(&nn
->laundromat_work
, laundromat_main
);
6729 kfree(nn
->unconf_id_hashtbl
);
6731 kfree(nn
->conf_id_hashtbl
);
6737 nfs4_state_destroy_net(struct net
*net
)
6740 struct nfs4_client
*clp
= NULL
;
6741 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
6743 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6744 while (!list_empty(&nn
->conf_id_hashtbl
[i
])) {
6745 clp
= list_entry(nn
->conf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
6746 destroy_client(clp
);
6750 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6751 while (!list_empty(&nn
->unconf_id_hashtbl
[i
])) {
6752 clp
= list_entry(nn
->unconf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
6753 destroy_client(clp
);
6757 kfree(nn
->sessionid_hashtbl
);
6758 kfree(nn
->unconf_id_hashtbl
);
6759 kfree(nn
->conf_id_hashtbl
);
6764 nfs4_state_start_net(struct net
*net
)
6766 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
6769 ret
= nfs4_state_create_net(net
);
6772 nn
->boot_time
= get_seconds();
6773 nn
->grace_ended
= false;
6774 nn
->nfsd4_manager
.block_opens
= true;
6775 locks_start_grace(net
, &nn
->nfsd4_manager
);
6776 nfsd4_client_tracking_init(net
);
6777 printk(KERN_INFO
"NFSD: starting %ld-second grace period (net %p)\n",
6778 nn
->nfsd4_grace
, net
);
6779 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, nn
->nfsd4_grace
* HZ
);
6783 /* initialization to perform when the nfsd service is started: */
6786 nfs4_state_start(void)
6790 ret
= set_callback_cred();
6793 laundry_wq
= alloc_workqueue("%s", WQ_UNBOUND
, 0, "nfsd4");
6794 if (laundry_wq
== NULL
) {
6798 ret
= nfsd4_create_callback_queue();
6800 goto out_free_laundry
;
6802 set_max_delegations();
6807 destroy_workqueue(laundry_wq
);
6813 nfs4_state_shutdown_net(struct net
*net
)
6815 struct nfs4_delegation
*dp
= NULL
;
6816 struct list_head
*pos
, *next
, reaplist
;
6817 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
6819 cancel_delayed_work_sync(&nn
->laundromat_work
);
6820 locks_end_grace(&nn
->nfsd4_manager
);
6822 INIT_LIST_HEAD(&reaplist
);
6823 spin_lock(&state_lock
);
6824 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
6825 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
6826 WARN_ON(!unhash_delegation_locked(dp
));
6827 list_add(&dp
->dl_recall_lru
, &reaplist
);
6829 spin_unlock(&state_lock
);
6830 list_for_each_safe(pos
, next
, &reaplist
) {
6831 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
6832 list_del_init(&dp
->dl_recall_lru
);
6833 put_clnt_odstate(dp
->dl_clnt_odstate
);
6834 nfs4_put_deleg_lease(dp
->dl_stid
.sc_file
);
6835 nfs4_put_stid(&dp
->dl_stid
);
6838 nfsd4_client_tracking_exit(net
);
6839 nfs4_state_destroy_net(net
);
6843 nfs4_state_shutdown(void)
6845 destroy_workqueue(laundry_wq
);
6846 nfsd4_destroy_callback_queue();
6850 get_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
6852 if (HAS_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
) && CURRENT_STATEID(stateid
))
6853 memcpy(stateid
, &cstate
->current_stateid
, sizeof(stateid_t
));
6857 put_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
6859 if (cstate
->minorversion
) {
6860 memcpy(&cstate
->current_stateid
, stateid
, sizeof(stateid_t
));
6861 SET_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
6866 clear_current_stateid(struct nfsd4_compound_state
*cstate
)
6868 CLEAR_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
6872 * functions to set current state id
6875 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_open_downgrade
*odp
)
6877 put_stateid(cstate
, &odp
->od_stateid
);
6881 nfsd4_set_openstateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_open
*open
)
6883 put_stateid(cstate
, &open
->op_stateid
);
6887 nfsd4_set_closestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_close
*close
)
6889 put_stateid(cstate
, &close
->cl_stateid
);
6893 nfsd4_set_lockstateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_lock
*lock
)
6895 put_stateid(cstate
, &lock
->lk_resp_stateid
);
6899 * functions to consume current state id
6903 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_open_downgrade
*odp
)
6905 get_stateid(cstate
, &odp
->od_stateid
);
6909 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_delegreturn
*drp
)
6911 get_stateid(cstate
, &drp
->dr_stateid
);
6915 nfsd4_get_freestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_free_stateid
*fsp
)
6917 get_stateid(cstate
, &fsp
->fr_stateid
);
6921 nfsd4_get_setattrstateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_setattr
*setattr
)
6923 get_stateid(cstate
, &setattr
->sa_stateid
);
6927 nfsd4_get_closestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_close
*close
)
6929 get_stateid(cstate
, &close
->cl_stateid
);
6933 nfsd4_get_lockustateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_locku
*locku
)
6935 get_stateid(cstate
, &locku
->lu_stateid
);
6939 nfsd4_get_readstateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_read
*read
)
6941 get_stateid(cstate
, &read
->rd_stateid
);
6945 nfsd4_get_writestateid(struct nfsd4_compound_state
*cstate
, struct nfsd4_write
*write
)
6947 get_stateid(cstate
, &write
->wr_stateid
);