2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
48 #include "current_stateid.h"
53 #define NFSDDBG_FACILITY NFSDDBG_PROC
55 #define all_ones {{~0,~0},~0}
56 static const stateid_t one_stateid
= {
58 .si_opaque
= all_ones
,
60 static const stateid_t zero_stateid
= {
63 static const stateid_t currentstateid
= {
66 static const stateid_t close_stateid
= {
67 .si_generation
= 0xffffffffU
,
70 static u64 current_sessionid
= 1;
72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
73 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
74 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
75 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
77 /* forward declarations */
78 static bool check_for_locks(struct nfs4_file
*fp
, struct nfs4_lockowner
*lowner
);
79 static void nfs4_free_ol_stateid(struct nfs4_stid
*stid
);
84 * Currently used for the del_recall_lru and file hash table. In an
85 * effort to decrease the scope of the client_mutex, this spinlock may
86 * eventually cover more:
88 static DEFINE_SPINLOCK(state_lock
);
90 enum nfsd4_st_mutex_lock_subclass
{
91 OPEN_STATEID_MUTEX
= 0,
92 LOCK_STATEID_MUTEX
= 1,
96 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
97 * the refcount on the open stateid to drop.
99 static DECLARE_WAIT_QUEUE_HEAD(close_wq
);
101 static struct kmem_cache
*client_slab
;
102 static struct kmem_cache
*openowner_slab
;
103 static struct kmem_cache
*lockowner_slab
;
104 static struct kmem_cache
*file_slab
;
105 static struct kmem_cache
*stateid_slab
;
106 static struct kmem_cache
*deleg_slab
;
107 static struct kmem_cache
*odstate_slab
;
109 static void free_session(struct nfsd4_session
*);
111 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops
;
112 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops
;
114 static bool is_session_dead(struct nfsd4_session
*ses
)
116 return ses
->se_flags
& NFS4_SESSION_DEAD
;
119 static __be32
mark_session_dead_locked(struct nfsd4_session
*ses
, int ref_held_by_me
)
121 if (atomic_read(&ses
->se_ref
) > ref_held_by_me
)
122 return nfserr_jukebox
;
123 ses
->se_flags
|= NFS4_SESSION_DEAD
;
127 static bool is_client_expired(struct nfs4_client
*clp
)
129 return clp
->cl_time
== 0;
132 static __be32
get_client_locked(struct nfs4_client
*clp
)
134 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
136 lockdep_assert_held(&nn
->client_lock
);
138 if (is_client_expired(clp
))
139 return nfserr_expired
;
140 atomic_inc(&clp
->cl_refcount
);
144 /* must be called under the client_lock */
146 renew_client_locked(struct nfs4_client
*clp
)
148 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
150 if (is_client_expired(clp
)) {
152 printk("%s: client (clientid %08x/%08x) already expired\n",
154 clp
->cl_clientid
.cl_boot
,
155 clp
->cl_clientid
.cl_id
);
159 dprintk("renewing client (clientid %08x/%08x)\n",
160 clp
->cl_clientid
.cl_boot
,
161 clp
->cl_clientid
.cl_id
);
162 list_move_tail(&clp
->cl_lru
, &nn
->client_lru
);
163 clp
->cl_time
= get_seconds();
166 static void put_client_renew_locked(struct nfs4_client
*clp
)
168 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
170 lockdep_assert_held(&nn
->client_lock
);
172 if (!atomic_dec_and_test(&clp
->cl_refcount
))
174 if (!is_client_expired(clp
))
175 renew_client_locked(clp
);
178 static void put_client_renew(struct nfs4_client
*clp
)
180 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
182 if (!atomic_dec_and_lock(&clp
->cl_refcount
, &nn
->client_lock
))
184 if (!is_client_expired(clp
))
185 renew_client_locked(clp
);
186 spin_unlock(&nn
->client_lock
);
189 static __be32
nfsd4_get_session_locked(struct nfsd4_session
*ses
)
193 if (is_session_dead(ses
))
194 return nfserr_badsession
;
195 status
= get_client_locked(ses
->se_client
);
198 atomic_inc(&ses
->se_ref
);
202 static void nfsd4_put_session_locked(struct nfsd4_session
*ses
)
204 struct nfs4_client
*clp
= ses
->se_client
;
205 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
207 lockdep_assert_held(&nn
->client_lock
);
209 if (atomic_dec_and_test(&ses
->se_ref
) && is_session_dead(ses
))
211 put_client_renew_locked(clp
);
214 static void nfsd4_put_session(struct nfsd4_session
*ses
)
216 struct nfs4_client
*clp
= ses
->se_client
;
217 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
219 spin_lock(&nn
->client_lock
);
220 nfsd4_put_session_locked(ses
);
221 spin_unlock(&nn
->client_lock
);
224 static struct nfsd4_blocked_lock
*
225 find_blocked_lock(struct nfs4_lockowner
*lo
, struct knfsd_fh
*fh
,
228 struct nfsd4_blocked_lock
*cur
, *found
= NULL
;
230 spin_lock(&nn
->blocked_locks_lock
);
231 list_for_each_entry(cur
, &lo
->lo_blocked
, nbl_list
) {
232 if (fh_match(fh
, &cur
->nbl_fh
)) {
233 list_del_init(&cur
->nbl_list
);
234 list_del_init(&cur
->nbl_lru
);
239 spin_unlock(&nn
->blocked_locks_lock
);
241 locks_delete_block(&found
->nbl_lock
);
245 static struct nfsd4_blocked_lock
*
246 find_or_allocate_block(struct nfs4_lockowner
*lo
, struct knfsd_fh
*fh
,
249 struct nfsd4_blocked_lock
*nbl
;
251 nbl
= find_blocked_lock(lo
, fh
, nn
);
253 nbl
= kmalloc(sizeof(*nbl
), GFP_KERNEL
);
255 fh_copy_shallow(&nbl
->nbl_fh
, fh
);
256 locks_init_lock(&nbl
->nbl_lock
);
257 nfsd4_init_cb(&nbl
->nbl_cb
, lo
->lo_owner
.so_client
,
258 &nfsd4_cb_notify_lock_ops
,
259 NFSPROC4_CLNT_CB_NOTIFY_LOCK
);
266 free_blocked_lock(struct nfsd4_blocked_lock
*nbl
)
268 locks_delete_block(&nbl
->nbl_lock
);
269 locks_release_private(&nbl
->nbl_lock
);
274 remove_blocked_locks(struct nfs4_lockowner
*lo
)
276 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
277 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
278 struct nfsd4_blocked_lock
*nbl
;
281 /* Dequeue all blocked locks */
282 spin_lock(&nn
->blocked_locks_lock
);
283 while (!list_empty(&lo
->lo_blocked
)) {
284 nbl
= list_first_entry(&lo
->lo_blocked
,
285 struct nfsd4_blocked_lock
,
287 list_del_init(&nbl
->nbl_list
);
288 list_move(&nbl
->nbl_lru
, &reaplist
);
290 spin_unlock(&nn
->blocked_locks_lock
);
293 while (!list_empty(&reaplist
)) {
294 nbl
= list_first_entry(&reaplist
, struct nfsd4_blocked_lock
,
296 list_del_init(&nbl
->nbl_lru
);
297 free_blocked_lock(nbl
);
302 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback
*cb
)
304 struct nfsd4_blocked_lock
*nbl
= container_of(cb
,
305 struct nfsd4_blocked_lock
, nbl_cb
);
306 locks_delete_block(&nbl
->nbl_lock
);
310 nfsd4_cb_notify_lock_done(struct nfsd4_callback
*cb
, struct rpc_task
*task
)
313 * Since this is just an optimization, we don't try very hard if it
314 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
315 * just quit trying on anything else.
317 switch (task
->tk_status
) {
319 rpc_delay(task
, 1 * HZ
);
327 nfsd4_cb_notify_lock_release(struct nfsd4_callback
*cb
)
329 struct nfsd4_blocked_lock
*nbl
= container_of(cb
,
330 struct nfsd4_blocked_lock
, nbl_cb
);
332 free_blocked_lock(nbl
);
335 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops
= {
336 .prepare
= nfsd4_cb_notify_lock_prepare
,
337 .done
= nfsd4_cb_notify_lock_done
,
338 .release
= nfsd4_cb_notify_lock_release
,
341 static inline struct nfs4_stateowner
*
342 nfs4_get_stateowner(struct nfs4_stateowner
*sop
)
344 atomic_inc(&sop
->so_count
);
349 same_owner_str(struct nfs4_stateowner
*sop
, struct xdr_netobj
*owner
)
351 return (sop
->so_owner
.len
== owner
->len
) &&
352 0 == memcmp(sop
->so_owner
.data
, owner
->data
, owner
->len
);
355 static struct nfs4_openowner
*
356 find_openstateowner_str_locked(unsigned int hashval
, struct nfsd4_open
*open
,
357 struct nfs4_client
*clp
)
359 struct nfs4_stateowner
*so
;
361 lockdep_assert_held(&clp
->cl_lock
);
363 list_for_each_entry(so
, &clp
->cl_ownerstr_hashtbl
[hashval
],
365 if (!so
->so_is_open_owner
)
367 if (same_owner_str(so
, &open
->op_owner
))
368 return openowner(nfs4_get_stateowner(so
));
373 static struct nfs4_openowner
*
374 find_openstateowner_str(unsigned int hashval
, struct nfsd4_open
*open
,
375 struct nfs4_client
*clp
)
377 struct nfs4_openowner
*oo
;
379 spin_lock(&clp
->cl_lock
);
380 oo
= find_openstateowner_str_locked(hashval
, open
, clp
);
381 spin_unlock(&clp
->cl_lock
);
386 opaque_hashval(const void *ptr
, int nbytes
)
388 unsigned char *cptr
= (unsigned char *) ptr
;
398 static void nfsd4_free_file_rcu(struct rcu_head
*rcu
)
400 struct nfs4_file
*fp
= container_of(rcu
, struct nfs4_file
, fi_rcu
);
402 kmem_cache_free(file_slab
, fp
);
406 put_nfs4_file(struct nfs4_file
*fi
)
408 might_lock(&state_lock
);
410 if (refcount_dec_and_lock(&fi
->fi_ref
, &state_lock
)) {
411 hlist_del_rcu(&fi
->fi_hash
);
412 spin_unlock(&state_lock
);
413 WARN_ON_ONCE(!list_empty(&fi
->fi_clnt_odstate
));
414 WARN_ON_ONCE(!list_empty(&fi
->fi_delegations
));
415 call_rcu(&fi
->fi_rcu
, nfsd4_free_file_rcu
);
420 __nfs4_get_fd(struct nfs4_file
*f
, int oflag
)
422 if (f
->fi_fds
[oflag
])
423 return get_file(f
->fi_fds
[oflag
]);
428 find_writeable_file_locked(struct nfs4_file
*f
)
432 lockdep_assert_held(&f
->fi_lock
);
434 ret
= __nfs4_get_fd(f
, O_WRONLY
);
436 ret
= __nfs4_get_fd(f
, O_RDWR
);
441 find_writeable_file(struct nfs4_file
*f
)
445 spin_lock(&f
->fi_lock
);
446 ret
= find_writeable_file_locked(f
);
447 spin_unlock(&f
->fi_lock
);
452 static struct file
*find_readable_file_locked(struct nfs4_file
*f
)
456 lockdep_assert_held(&f
->fi_lock
);
458 ret
= __nfs4_get_fd(f
, O_RDONLY
);
460 ret
= __nfs4_get_fd(f
, O_RDWR
);
465 find_readable_file(struct nfs4_file
*f
)
469 spin_lock(&f
->fi_lock
);
470 ret
= find_readable_file_locked(f
);
471 spin_unlock(&f
->fi_lock
);
477 find_any_file(struct nfs4_file
*f
)
481 spin_lock(&f
->fi_lock
);
482 ret
= __nfs4_get_fd(f
, O_RDWR
);
484 ret
= __nfs4_get_fd(f
, O_WRONLY
);
486 ret
= __nfs4_get_fd(f
, O_RDONLY
);
488 spin_unlock(&f
->fi_lock
);
492 static atomic_long_t num_delegations
;
493 unsigned long max_delegations
;
496 * Open owner state (share locks)
499 /* hash tables for lock and open owners */
500 #define OWNER_HASH_BITS 8
501 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
502 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
504 static unsigned int ownerstr_hashval(struct xdr_netobj
*ownername
)
508 ret
= opaque_hashval(ownername
->data
, ownername
->len
);
509 return ret
& OWNER_HASH_MASK
;
512 /* hash table for nfs4_file */
513 #define FILE_HASH_BITS 8
514 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
516 static unsigned int nfsd_fh_hashval(struct knfsd_fh
*fh
)
518 return jhash2(fh
->fh_base
.fh_pad
, XDR_QUADLEN(fh
->fh_size
), 0);
521 static unsigned int file_hashval(struct knfsd_fh
*fh
)
523 return nfsd_fh_hashval(fh
) & (FILE_HASH_SIZE
- 1);
526 static struct hlist_head file_hashtbl
[FILE_HASH_SIZE
];
529 __nfs4_file_get_access(struct nfs4_file
*fp
, u32 access
)
531 lockdep_assert_held(&fp
->fi_lock
);
533 if (access
& NFS4_SHARE_ACCESS_WRITE
)
534 atomic_inc(&fp
->fi_access
[O_WRONLY
]);
535 if (access
& NFS4_SHARE_ACCESS_READ
)
536 atomic_inc(&fp
->fi_access
[O_RDONLY
]);
540 nfs4_file_get_access(struct nfs4_file
*fp
, u32 access
)
542 lockdep_assert_held(&fp
->fi_lock
);
544 /* Does this access mode make sense? */
545 if (access
& ~NFS4_SHARE_ACCESS_BOTH
)
548 /* Does it conflict with a deny mode already set? */
549 if ((access
& fp
->fi_share_deny
) != 0)
550 return nfserr_share_denied
;
552 __nfs4_file_get_access(fp
, access
);
556 static __be32
nfs4_file_check_deny(struct nfs4_file
*fp
, u32 deny
)
558 /* Common case is that there is no deny mode. */
560 /* Does this deny mode make sense? */
561 if (deny
& ~NFS4_SHARE_DENY_BOTH
)
564 if ((deny
& NFS4_SHARE_DENY_READ
) &&
565 atomic_read(&fp
->fi_access
[O_RDONLY
]))
566 return nfserr_share_denied
;
568 if ((deny
& NFS4_SHARE_DENY_WRITE
) &&
569 atomic_read(&fp
->fi_access
[O_WRONLY
]))
570 return nfserr_share_denied
;
575 static void __nfs4_file_put_access(struct nfs4_file
*fp
, int oflag
)
577 might_lock(&fp
->fi_lock
);
579 if (atomic_dec_and_lock(&fp
->fi_access
[oflag
], &fp
->fi_lock
)) {
580 struct file
*f1
= NULL
;
581 struct file
*f2
= NULL
;
583 swap(f1
, fp
->fi_fds
[oflag
]);
584 if (atomic_read(&fp
->fi_access
[1 - oflag
]) == 0)
585 swap(f2
, fp
->fi_fds
[O_RDWR
]);
586 spin_unlock(&fp
->fi_lock
);
594 static void nfs4_file_put_access(struct nfs4_file
*fp
, u32 access
)
596 WARN_ON_ONCE(access
& ~NFS4_SHARE_ACCESS_BOTH
);
598 if (access
& NFS4_SHARE_ACCESS_WRITE
)
599 __nfs4_file_put_access(fp
, O_WRONLY
);
600 if (access
& NFS4_SHARE_ACCESS_READ
)
601 __nfs4_file_put_access(fp
, O_RDONLY
);
605 * Allocate a new open/delegation state counter. This is needed for
606 * pNFS for proper return on close semantics.
608 * Note that we only allocate it for pNFS-enabled exports, otherwise
609 * all pointers to struct nfs4_clnt_odstate are always NULL.
611 static struct nfs4_clnt_odstate
*
612 alloc_clnt_odstate(struct nfs4_client
*clp
)
614 struct nfs4_clnt_odstate
*co
;
616 co
= kmem_cache_zalloc(odstate_slab
, GFP_KERNEL
);
619 refcount_set(&co
->co_odcount
, 1);
625 hash_clnt_odstate_locked(struct nfs4_clnt_odstate
*co
)
627 struct nfs4_file
*fp
= co
->co_file
;
629 lockdep_assert_held(&fp
->fi_lock
);
630 list_add(&co
->co_perfile
, &fp
->fi_clnt_odstate
);
634 get_clnt_odstate(struct nfs4_clnt_odstate
*co
)
637 refcount_inc(&co
->co_odcount
);
641 put_clnt_odstate(struct nfs4_clnt_odstate
*co
)
643 struct nfs4_file
*fp
;
649 if (refcount_dec_and_lock(&co
->co_odcount
, &fp
->fi_lock
)) {
650 list_del(&co
->co_perfile
);
651 spin_unlock(&fp
->fi_lock
);
653 nfsd4_return_all_file_layouts(co
->co_client
, fp
);
654 kmem_cache_free(odstate_slab
, co
);
658 static struct nfs4_clnt_odstate
*
659 find_or_hash_clnt_odstate(struct nfs4_file
*fp
, struct nfs4_clnt_odstate
*new)
661 struct nfs4_clnt_odstate
*co
;
662 struct nfs4_client
*cl
;
669 spin_lock(&fp
->fi_lock
);
670 list_for_each_entry(co
, &fp
->fi_clnt_odstate
, co_perfile
) {
671 if (co
->co_client
== cl
) {
672 get_clnt_odstate(co
);
678 hash_clnt_odstate_locked(new);
680 spin_unlock(&fp
->fi_lock
);
684 struct nfs4_stid
*nfs4_alloc_stid(struct nfs4_client
*cl
, struct kmem_cache
*slab
,
685 void (*sc_free
)(struct nfs4_stid
*))
687 struct nfs4_stid
*stid
;
690 stid
= kmem_cache_zalloc(slab
, GFP_KERNEL
);
694 idr_preload(GFP_KERNEL
);
695 spin_lock(&cl
->cl_lock
);
696 new_id
= idr_alloc_cyclic(&cl
->cl_stateids
, stid
, 0, 0, GFP_NOWAIT
);
697 spin_unlock(&cl
->cl_lock
);
702 stid
->sc_free
= sc_free
;
703 stid
->sc_client
= cl
;
704 stid
->sc_stateid
.si_opaque
.so_id
= new_id
;
705 stid
->sc_stateid
.si_opaque
.so_clid
= cl
->cl_clientid
;
706 /* Will be incremented before return to client: */
707 refcount_set(&stid
->sc_count
, 1);
708 spin_lock_init(&stid
->sc_lock
);
711 * It shouldn't be a problem to reuse an opaque stateid value.
712 * I don't think it is for 4.1. But with 4.0 I worry that, for
713 * example, a stray write retransmission could be accepted by
714 * the server when it should have been rejected. Therefore,
715 * adopt a trick from the sctp code to attempt to maximize the
716 * amount of time until an id is reused, by ensuring they always
717 * "increase" (mod INT_MAX):
721 kmem_cache_free(slab
, stid
);
726 * Create a unique stateid_t to represent each COPY.
728 int nfs4_init_cp_state(struct nfsd_net
*nn
, struct nfsd4_copy
*copy
)
732 idr_preload(GFP_KERNEL
);
733 spin_lock(&nn
->s2s_cp_lock
);
734 new_id
= idr_alloc_cyclic(&nn
->s2s_cp_stateids
, copy
, 0, 0, GFP_NOWAIT
);
735 spin_unlock(&nn
->s2s_cp_lock
);
739 copy
->cp_stateid
.si_opaque
.so_id
= new_id
;
740 copy
->cp_stateid
.si_opaque
.so_clid
.cl_boot
= nn
->boot_time
;
741 copy
->cp_stateid
.si_opaque
.so_clid
.cl_id
= nn
->s2s_cp_cl_id
;
745 void nfs4_free_cp_state(struct nfsd4_copy
*copy
)
749 nn
= net_generic(copy
->cp_clp
->net
, nfsd_net_id
);
750 spin_lock(&nn
->s2s_cp_lock
);
751 idr_remove(&nn
->s2s_cp_stateids
, copy
->cp_stateid
.si_opaque
.so_id
);
752 spin_unlock(&nn
->s2s_cp_lock
);
755 static struct nfs4_ol_stateid
* nfs4_alloc_open_stateid(struct nfs4_client
*clp
)
757 struct nfs4_stid
*stid
;
759 stid
= nfs4_alloc_stid(clp
, stateid_slab
, nfs4_free_ol_stateid
);
763 return openlockstateid(stid
);
766 static void nfs4_free_deleg(struct nfs4_stid
*stid
)
768 kmem_cache_free(deleg_slab
, stid
);
769 atomic_long_dec(&num_delegations
);
773 * When we recall a delegation, we should be careful not to hand it
774 * out again straight away.
775 * To ensure this we keep a pair of bloom filters ('new' and 'old')
776 * in which the filehandles of recalled delegations are "stored".
777 * If a filehandle appear in either filter, a delegation is blocked.
778 * When a delegation is recalled, the filehandle is stored in the "new"
780 * Every 30 seconds we swap the filters and clear the "new" one,
781 * unless both are empty of course.
783 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
784 * low 3 bytes as hash-table indices.
786 * 'blocked_delegations_lock', which is always taken in block_delegations(),
787 * is used to manage concurrent access. Testing does not need the lock
788 * except when swapping the two filters.
790 static DEFINE_SPINLOCK(blocked_delegations_lock
);
791 static struct bloom_pair
{
792 int entries
, old_entries
;
794 int new; /* index into 'set' */
795 DECLARE_BITMAP(set
[2], 256);
796 } blocked_delegations
;
798 static int delegation_blocked(struct knfsd_fh
*fh
)
801 struct bloom_pair
*bd
= &blocked_delegations
;
803 if (bd
->entries
== 0)
805 if (seconds_since_boot() - bd
->swap_time
> 30) {
806 spin_lock(&blocked_delegations_lock
);
807 if (seconds_since_boot() - bd
->swap_time
> 30) {
808 bd
->entries
-= bd
->old_entries
;
809 bd
->old_entries
= bd
->entries
;
810 memset(bd
->set
[bd
->new], 0,
813 bd
->swap_time
= seconds_since_boot();
815 spin_unlock(&blocked_delegations_lock
);
817 hash
= jhash(&fh
->fh_base
, fh
->fh_size
, 0);
818 if (test_bit(hash
&255, bd
->set
[0]) &&
819 test_bit((hash
>>8)&255, bd
->set
[0]) &&
820 test_bit((hash
>>16)&255, bd
->set
[0]))
823 if (test_bit(hash
&255, bd
->set
[1]) &&
824 test_bit((hash
>>8)&255, bd
->set
[1]) &&
825 test_bit((hash
>>16)&255, bd
->set
[1]))
831 static void block_delegations(struct knfsd_fh
*fh
)
834 struct bloom_pair
*bd
= &blocked_delegations
;
836 hash
= jhash(&fh
->fh_base
, fh
->fh_size
, 0);
838 spin_lock(&blocked_delegations_lock
);
839 __set_bit(hash
&255, bd
->set
[bd
->new]);
840 __set_bit((hash
>>8)&255, bd
->set
[bd
->new]);
841 __set_bit((hash
>>16)&255, bd
->set
[bd
->new]);
842 if (bd
->entries
== 0)
843 bd
->swap_time
= seconds_since_boot();
845 spin_unlock(&blocked_delegations_lock
);
848 static struct nfs4_delegation
*
849 alloc_init_deleg(struct nfs4_client
*clp
, struct nfs4_file
*fp
,
850 struct svc_fh
*current_fh
,
851 struct nfs4_clnt_odstate
*odstate
)
853 struct nfs4_delegation
*dp
;
856 dprintk("NFSD alloc_init_deleg\n");
857 n
= atomic_long_inc_return(&num_delegations
);
858 if (n
< 0 || n
> max_delegations
)
860 if (delegation_blocked(¤t_fh
->fh_handle
))
862 dp
= delegstateid(nfs4_alloc_stid(clp
, deleg_slab
, nfs4_free_deleg
));
867 * delegation seqid's are never incremented. The 4.1 special
868 * meaning of seqid 0 isn't meaningful, really, but let's avoid
869 * 0 anyway just for consistency and use 1:
871 dp
->dl_stid
.sc_stateid
.si_generation
= 1;
872 INIT_LIST_HEAD(&dp
->dl_perfile
);
873 INIT_LIST_HEAD(&dp
->dl_perclnt
);
874 INIT_LIST_HEAD(&dp
->dl_recall_lru
);
875 dp
->dl_clnt_odstate
= odstate
;
876 get_clnt_odstate(odstate
);
877 dp
->dl_type
= NFS4_OPEN_DELEGATE_READ
;
879 nfsd4_init_cb(&dp
->dl_recall
, dp
->dl_stid
.sc_client
,
880 &nfsd4_cb_recall_ops
, NFSPROC4_CLNT_CB_RECALL
);
882 dp
->dl_stid
.sc_file
= fp
;
885 atomic_long_dec(&num_delegations
);
890 nfs4_put_stid(struct nfs4_stid
*s
)
892 struct nfs4_file
*fp
= s
->sc_file
;
893 struct nfs4_client
*clp
= s
->sc_client
;
895 might_lock(&clp
->cl_lock
);
897 if (!refcount_dec_and_lock(&s
->sc_count
, &clp
->cl_lock
)) {
898 wake_up_all(&close_wq
);
901 idr_remove(&clp
->cl_stateids
, s
->sc_stateid
.si_opaque
.so_id
);
902 spin_unlock(&clp
->cl_lock
);
909 nfs4_inc_and_copy_stateid(stateid_t
*dst
, struct nfs4_stid
*stid
)
911 stateid_t
*src
= &stid
->sc_stateid
;
913 spin_lock(&stid
->sc_lock
);
914 if (unlikely(++src
->si_generation
== 0))
915 src
->si_generation
= 1;
916 memcpy(dst
, src
, sizeof(*dst
));
917 spin_unlock(&stid
->sc_lock
);
920 static void put_deleg_file(struct nfs4_file
*fp
)
922 struct file
*filp
= NULL
;
924 spin_lock(&fp
->fi_lock
);
925 if (--fp
->fi_delegees
== 0)
926 swap(filp
, fp
->fi_deleg_file
);
927 spin_unlock(&fp
->fi_lock
);
933 static void nfs4_unlock_deleg_lease(struct nfs4_delegation
*dp
)
935 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
936 struct file
*filp
= fp
->fi_deleg_file
;
938 WARN_ON_ONCE(!fp
->fi_delegees
);
940 vfs_setlease(filp
, F_UNLCK
, NULL
, (void **)&dp
);
944 static void destroy_unhashed_deleg(struct nfs4_delegation
*dp
)
946 put_clnt_odstate(dp
->dl_clnt_odstate
);
947 nfs4_unlock_deleg_lease(dp
);
948 nfs4_put_stid(&dp
->dl_stid
);
951 void nfs4_unhash_stid(struct nfs4_stid
*s
)
957 * nfs4_delegation_exists - Discover if this delegation already exists
958 * @clp: a pointer to the nfs4_client we're granting a delegation to
959 * @fp: a pointer to the nfs4_file we're granting a delegation on
962 * On success: true iff an existing delegation is found
966 nfs4_delegation_exists(struct nfs4_client
*clp
, struct nfs4_file
*fp
)
968 struct nfs4_delegation
*searchdp
= NULL
;
969 struct nfs4_client
*searchclp
= NULL
;
971 lockdep_assert_held(&state_lock
);
972 lockdep_assert_held(&fp
->fi_lock
);
974 list_for_each_entry(searchdp
, &fp
->fi_delegations
, dl_perfile
) {
975 searchclp
= searchdp
->dl_stid
.sc_client
;
976 if (clp
== searchclp
) {
984 * hash_delegation_locked - Add a delegation to the appropriate lists
985 * @dp: a pointer to the nfs4_delegation we are adding.
986 * @fp: a pointer to the nfs4_file we're granting a delegation on
989 * On success: NULL if the delegation was successfully hashed.
991 * On error: -EAGAIN if one was previously granted to this
992 * nfs4_client for this nfs4_file. Delegation is not hashed.
997 hash_delegation_locked(struct nfs4_delegation
*dp
, struct nfs4_file
*fp
)
999 struct nfs4_client
*clp
= dp
->dl_stid
.sc_client
;
1001 lockdep_assert_held(&state_lock
);
1002 lockdep_assert_held(&fp
->fi_lock
);
1004 if (nfs4_delegation_exists(clp
, fp
))
1006 refcount_inc(&dp
->dl_stid
.sc_count
);
1007 dp
->dl_stid
.sc_type
= NFS4_DELEG_STID
;
1008 list_add(&dp
->dl_perfile
, &fp
->fi_delegations
);
1009 list_add(&dp
->dl_perclnt
, &clp
->cl_delegations
);
1014 unhash_delegation_locked(struct nfs4_delegation
*dp
)
1016 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
1018 lockdep_assert_held(&state_lock
);
1020 if (list_empty(&dp
->dl_perfile
))
1023 dp
->dl_stid
.sc_type
= NFS4_CLOSED_DELEG_STID
;
1024 /* Ensure that deleg break won't try to requeue it */
1026 spin_lock(&fp
->fi_lock
);
1027 list_del_init(&dp
->dl_perclnt
);
1028 list_del_init(&dp
->dl_recall_lru
);
1029 list_del_init(&dp
->dl_perfile
);
1030 spin_unlock(&fp
->fi_lock
);
1034 static void destroy_delegation(struct nfs4_delegation
*dp
)
1038 spin_lock(&state_lock
);
1039 unhashed
= unhash_delegation_locked(dp
);
1040 spin_unlock(&state_lock
);
1042 destroy_unhashed_deleg(dp
);
1045 static void revoke_delegation(struct nfs4_delegation
*dp
)
1047 struct nfs4_client
*clp
= dp
->dl_stid
.sc_client
;
1049 WARN_ON(!list_empty(&dp
->dl_recall_lru
));
1051 if (clp
->cl_minorversion
) {
1052 dp
->dl_stid
.sc_type
= NFS4_REVOKED_DELEG_STID
;
1053 refcount_inc(&dp
->dl_stid
.sc_count
);
1054 spin_lock(&clp
->cl_lock
);
1055 list_add(&dp
->dl_recall_lru
, &clp
->cl_revoked
);
1056 spin_unlock(&clp
->cl_lock
);
1058 destroy_unhashed_deleg(dp
);
1065 static unsigned int clientid_hashval(u32 id
)
1067 return id
& CLIENT_HASH_MASK
;
1070 static unsigned int clientstr_hashval(const char *name
)
1072 return opaque_hashval(name
, 8) & CLIENT_HASH_MASK
;
1076 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1077 * st_{access,deny}_bmap field of the stateid, in order to track not
1078 * only what share bits are currently in force, but also what
1079 * combinations of share bits previous opens have used. This allows us
1080 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1081 * return an error if the client attempt to downgrade to a combination
1082 * of share bits not explicable by closing some of its previous opens.
1084 * XXX: This enforcement is actually incomplete, since we don't keep
1085 * track of access/deny bit combinations; so, e.g., we allow:
1087 * OPEN allow read, deny write
1088 * OPEN allow both, deny none
1089 * DOWNGRADE allow read, deny none
1091 * which we should reject.
1094 bmap_to_share_mode(unsigned long bmap
) {
1096 unsigned int access
= 0;
1098 for (i
= 1; i
< 4; i
++) {
1099 if (test_bit(i
, &bmap
))
1105 /* set share access for a given stateid */
1107 set_access(u32 access
, struct nfs4_ol_stateid
*stp
)
1109 unsigned char mask
= 1 << access
;
1111 WARN_ON_ONCE(access
> NFS4_SHARE_ACCESS_BOTH
);
1112 stp
->st_access_bmap
|= mask
;
1115 /* clear share access for a given stateid */
1117 clear_access(u32 access
, struct nfs4_ol_stateid
*stp
)
1119 unsigned char mask
= 1 << access
;
1121 WARN_ON_ONCE(access
> NFS4_SHARE_ACCESS_BOTH
);
1122 stp
->st_access_bmap
&= ~mask
;
1125 /* test whether a given stateid has access */
1127 test_access(u32 access
, struct nfs4_ol_stateid
*stp
)
1129 unsigned char mask
= 1 << access
;
1131 return (bool)(stp
->st_access_bmap
& mask
);
1134 /* set share deny for a given stateid */
1136 set_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
1138 unsigned char mask
= 1 << deny
;
1140 WARN_ON_ONCE(deny
> NFS4_SHARE_DENY_BOTH
);
1141 stp
->st_deny_bmap
|= mask
;
1144 /* clear share deny for a given stateid */
1146 clear_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
1148 unsigned char mask
= 1 << deny
;
1150 WARN_ON_ONCE(deny
> NFS4_SHARE_DENY_BOTH
);
1151 stp
->st_deny_bmap
&= ~mask
;
1154 /* test whether a given stateid is denying specific access */
1156 test_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
1158 unsigned char mask
= 1 << deny
;
1160 return (bool)(stp
->st_deny_bmap
& mask
);
1163 static int nfs4_access_to_omode(u32 access
)
1165 switch (access
& NFS4_SHARE_ACCESS_BOTH
) {
1166 case NFS4_SHARE_ACCESS_READ
:
1168 case NFS4_SHARE_ACCESS_WRITE
:
1170 case NFS4_SHARE_ACCESS_BOTH
:
1178 * A stateid that had a deny mode associated with it is being released
1179 * or downgraded. Recalculate the deny mode on the file.
1182 recalculate_deny_mode(struct nfs4_file
*fp
)
1184 struct nfs4_ol_stateid
*stp
;
1186 spin_lock(&fp
->fi_lock
);
1187 fp
->fi_share_deny
= 0;
1188 list_for_each_entry(stp
, &fp
->fi_stateids
, st_perfile
)
1189 fp
->fi_share_deny
|= bmap_to_share_mode(stp
->st_deny_bmap
);
1190 spin_unlock(&fp
->fi_lock
);
1194 reset_union_bmap_deny(u32 deny
, struct nfs4_ol_stateid
*stp
)
1197 bool change
= false;
1199 for (i
= 1; i
< 4; i
++) {
1200 if ((i
& deny
) != i
) {
1206 /* Recalculate per-file deny mode if there was a change */
1208 recalculate_deny_mode(stp
->st_stid
.sc_file
);
1211 /* release all access and file references for a given stateid */
1213 release_all_access(struct nfs4_ol_stateid
*stp
)
1216 struct nfs4_file
*fp
= stp
->st_stid
.sc_file
;
1218 if (fp
&& stp
->st_deny_bmap
!= 0)
1219 recalculate_deny_mode(fp
);
1221 for (i
= 1; i
< 4; i
++) {
1222 if (test_access(i
, stp
))
1223 nfs4_file_put_access(stp
->st_stid
.sc_file
, i
);
1224 clear_access(i
, stp
);
1228 static inline void nfs4_free_stateowner(struct nfs4_stateowner
*sop
)
1230 kfree(sop
->so_owner
.data
);
1231 sop
->so_ops
->so_free(sop
);
1234 static void nfs4_put_stateowner(struct nfs4_stateowner
*sop
)
1236 struct nfs4_client
*clp
= sop
->so_client
;
1238 might_lock(&clp
->cl_lock
);
1240 if (!atomic_dec_and_lock(&sop
->so_count
, &clp
->cl_lock
))
1242 sop
->so_ops
->so_unhash(sop
);
1243 spin_unlock(&clp
->cl_lock
);
1244 nfs4_free_stateowner(sop
);
1247 static bool unhash_ol_stateid(struct nfs4_ol_stateid
*stp
)
1249 struct nfs4_file
*fp
= stp
->st_stid
.sc_file
;
1251 lockdep_assert_held(&stp
->st_stateowner
->so_client
->cl_lock
);
1253 if (list_empty(&stp
->st_perfile
))
1256 spin_lock(&fp
->fi_lock
);
1257 list_del_init(&stp
->st_perfile
);
1258 spin_unlock(&fp
->fi_lock
);
1259 list_del(&stp
->st_perstateowner
);
1263 static void nfs4_free_ol_stateid(struct nfs4_stid
*stid
)
1265 struct nfs4_ol_stateid
*stp
= openlockstateid(stid
);
1267 put_clnt_odstate(stp
->st_clnt_odstate
);
1268 release_all_access(stp
);
1269 if (stp
->st_stateowner
)
1270 nfs4_put_stateowner(stp
->st_stateowner
);
1271 kmem_cache_free(stateid_slab
, stid
);
1274 static void nfs4_free_lock_stateid(struct nfs4_stid
*stid
)
1276 struct nfs4_ol_stateid
*stp
= openlockstateid(stid
);
1277 struct nfs4_lockowner
*lo
= lockowner(stp
->st_stateowner
);
1280 file
= find_any_file(stp
->st_stid
.sc_file
);
1282 filp_close(file
, (fl_owner_t
)lo
);
1283 nfs4_free_ol_stateid(stid
);
1287 * Put the persistent reference to an already unhashed generic stateid, while
1288 * holding the cl_lock. If it's the last reference, then put it onto the
1289 * reaplist for later destruction.
1291 static void put_ol_stateid_locked(struct nfs4_ol_stateid
*stp
,
1292 struct list_head
*reaplist
)
1294 struct nfs4_stid
*s
= &stp
->st_stid
;
1295 struct nfs4_client
*clp
= s
->sc_client
;
1297 lockdep_assert_held(&clp
->cl_lock
);
1299 WARN_ON_ONCE(!list_empty(&stp
->st_locks
));
1301 if (!refcount_dec_and_test(&s
->sc_count
)) {
1302 wake_up_all(&close_wq
);
1306 idr_remove(&clp
->cl_stateids
, s
->sc_stateid
.si_opaque
.so_id
);
1307 list_add(&stp
->st_locks
, reaplist
);
1310 static bool unhash_lock_stateid(struct nfs4_ol_stateid
*stp
)
1312 lockdep_assert_held(&stp
->st_stid
.sc_client
->cl_lock
);
1314 list_del_init(&stp
->st_locks
);
1315 nfs4_unhash_stid(&stp
->st_stid
);
1316 return unhash_ol_stateid(stp
);
1319 static void release_lock_stateid(struct nfs4_ol_stateid
*stp
)
1321 struct nfs4_client
*clp
= stp
->st_stid
.sc_client
;
1324 spin_lock(&clp
->cl_lock
);
1325 unhashed
= unhash_lock_stateid(stp
);
1326 spin_unlock(&clp
->cl_lock
);
1328 nfs4_put_stid(&stp
->st_stid
);
1331 static void unhash_lockowner_locked(struct nfs4_lockowner
*lo
)
1333 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
1335 lockdep_assert_held(&clp
->cl_lock
);
1337 list_del_init(&lo
->lo_owner
.so_strhash
);
1341 * Free a list of generic stateids that were collected earlier after being
1345 free_ol_stateid_reaplist(struct list_head
*reaplist
)
1347 struct nfs4_ol_stateid
*stp
;
1348 struct nfs4_file
*fp
;
1352 while (!list_empty(reaplist
)) {
1353 stp
= list_first_entry(reaplist
, struct nfs4_ol_stateid
,
1355 list_del(&stp
->st_locks
);
1356 fp
= stp
->st_stid
.sc_file
;
1357 stp
->st_stid
.sc_free(&stp
->st_stid
);
1363 static void release_open_stateid_locks(struct nfs4_ol_stateid
*open_stp
,
1364 struct list_head
*reaplist
)
1366 struct nfs4_ol_stateid
*stp
;
1368 lockdep_assert_held(&open_stp
->st_stid
.sc_client
->cl_lock
);
1370 while (!list_empty(&open_stp
->st_locks
)) {
1371 stp
= list_entry(open_stp
->st_locks
.next
,
1372 struct nfs4_ol_stateid
, st_locks
);
1373 WARN_ON(!unhash_lock_stateid(stp
));
1374 put_ol_stateid_locked(stp
, reaplist
);
1378 static bool unhash_open_stateid(struct nfs4_ol_stateid
*stp
,
1379 struct list_head
*reaplist
)
1383 lockdep_assert_held(&stp
->st_stid
.sc_client
->cl_lock
);
1385 unhashed
= unhash_ol_stateid(stp
);
1386 release_open_stateid_locks(stp
, reaplist
);
1390 static void release_open_stateid(struct nfs4_ol_stateid
*stp
)
1392 LIST_HEAD(reaplist
);
1394 spin_lock(&stp
->st_stid
.sc_client
->cl_lock
);
1395 if (unhash_open_stateid(stp
, &reaplist
))
1396 put_ol_stateid_locked(stp
, &reaplist
);
1397 spin_unlock(&stp
->st_stid
.sc_client
->cl_lock
);
1398 free_ol_stateid_reaplist(&reaplist
);
1401 static void unhash_openowner_locked(struct nfs4_openowner
*oo
)
1403 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
1405 lockdep_assert_held(&clp
->cl_lock
);
1407 list_del_init(&oo
->oo_owner
.so_strhash
);
1408 list_del_init(&oo
->oo_perclient
);
1411 static void release_last_closed_stateid(struct nfs4_openowner
*oo
)
1413 struct nfsd_net
*nn
= net_generic(oo
->oo_owner
.so_client
->net
,
1415 struct nfs4_ol_stateid
*s
;
1417 spin_lock(&nn
->client_lock
);
1418 s
= oo
->oo_last_closed_stid
;
1420 list_del_init(&oo
->oo_close_lru
);
1421 oo
->oo_last_closed_stid
= NULL
;
1423 spin_unlock(&nn
->client_lock
);
1425 nfs4_put_stid(&s
->st_stid
);
1428 static void release_openowner(struct nfs4_openowner
*oo
)
1430 struct nfs4_ol_stateid
*stp
;
1431 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
1432 struct list_head reaplist
;
1434 INIT_LIST_HEAD(&reaplist
);
1436 spin_lock(&clp
->cl_lock
);
1437 unhash_openowner_locked(oo
);
1438 while (!list_empty(&oo
->oo_owner
.so_stateids
)) {
1439 stp
= list_first_entry(&oo
->oo_owner
.so_stateids
,
1440 struct nfs4_ol_stateid
, st_perstateowner
);
1441 if (unhash_open_stateid(stp
, &reaplist
))
1442 put_ol_stateid_locked(stp
, &reaplist
);
1444 spin_unlock(&clp
->cl_lock
);
1445 free_ol_stateid_reaplist(&reaplist
);
1446 release_last_closed_stateid(oo
);
1447 nfs4_put_stateowner(&oo
->oo_owner
);
1451 hash_sessionid(struct nfs4_sessionid
*sessionid
)
1453 struct nfsd4_sessionid
*sid
= (struct nfsd4_sessionid
*)sessionid
;
1455 return sid
->sequence
% SESSION_HASH_SIZE
;
1458 #ifdef CONFIG_SUNRPC_DEBUG
1460 dump_sessionid(const char *fn
, struct nfs4_sessionid
*sessionid
)
1462 u32
*ptr
= (u32
*)(&sessionid
->data
[0]);
1463 dprintk("%s: %u:%u:%u:%u\n", fn
, ptr
[0], ptr
[1], ptr
[2], ptr
[3]);
1467 dump_sessionid(const char *fn
, struct nfs4_sessionid
*sessionid
)
1473 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1474 * won't be used for replay.
1476 void nfsd4_bump_seqid(struct nfsd4_compound_state
*cstate
, __be32 nfserr
)
1478 struct nfs4_stateowner
*so
= cstate
->replay_owner
;
1480 if (nfserr
== nfserr_replay_me
)
1483 if (!seqid_mutating_err(ntohl(nfserr
))) {
1484 nfsd4_cstate_clear_replay(cstate
);
1489 if (so
->so_is_open_owner
)
1490 release_last_closed_stateid(openowner(so
));
1496 gen_sessionid(struct nfsd4_session
*ses
)
1498 struct nfs4_client
*clp
= ses
->se_client
;
1499 struct nfsd4_sessionid
*sid
;
1501 sid
= (struct nfsd4_sessionid
*)ses
->se_sessionid
.data
;
1502 sid
->clientid
= clp
->cl_clientid
;
1503 sid
->sequence
= current_sessionid
++;
1508 * The protocol defines ca_maxresponssize_cached to include the size of
1509 * the rpc header, but all we need to cache is the data starting after
1510 * the end of the initial SEQUENCE operation--the rest we regenerate
1511 * each time. Therefore we can advertise a ca_maxresponssize_cached
1512 * value that is the number of bytes in our cache plus a few additional
1513 * bytes. In order to stay on the safe side, and not promise more than
1514 * we can cache, those additional bytes must be the minimum possible: 24
1515 * bytes of rpc header (xid through accept state, with AUTH_NULL
1516 * verifier), 12 for the compound header (with zero-length tag), and 44
1517 * for the SEQUENCE op response:
1519 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1522 free_session_slots(struct nfsd4_session
*ses
)
1526 for (i
= 0; i
< ses
->se_fchannel
.maxreqs
; i
++) {
1527 free_svc_cred(&ses
->se_slots
[i
]->sl_cred
);
1528 kfree(ses
->se_slots
[i
]);
1533 * We don't actually need to cache the rpc and session headers, so we
1534 * can allocate a little less for each slot:
1536 static inline u32
slot_bytes(struct nfsd4_channel_attrs
*ca
)
1540 if (ca
->maxresp_cached
< NFSD_MIN_HDR_SEQ_SZ
)
1543 size
= ca
->maxresp_cached
- NFSD_MIN_HDR_SEQ_SZ
;
1544 return size
+ sizeof(struct nfsd4_slot
);
1548 * XXX: If we run out of reserved DRC memory we could (up to a point)
1549 * re-negotiate active sessions and reduce their slot usage to make
1550 * room for new connections. For now we just fail the create session.
1552 static u32
nfsd4_get_drc_mem(struct nfsd4_channel_attrs
*ca
)
1554 u32 slotsize
= slot_bytes(ca
);
1555 u32 num
= ca
->maxreqs
;
1556 unsigned long avail
, total_avail
;
1558 spin_lock(&nfsd_drc_lock
);
1559 total_avail
= nfsd_drc_max_mem
- nfsd_drc_mem_used
;
1560 avail
= min((unsigned long)NFSD_MAX_MEM_PER_SESSION
, total_avail
);
1562 * Never use more than a third of the remaining memory,
1563 * unless it's the only way to give this client a slot:
1565 avail
= clamp_t(int, avail
, slotsize
, total_avail
/3);
1566 num
= min_t(int, num
, avail
/ slotsize
);
1567 nfsd_drc_mem_used
+= num
* slotsize
;
1568 spin_unlock(&nfsd_drc_lock
);
1573 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs
*ca
)
1575 int slotsize
= slot_bytes(ca
);
1577 spin_lock(&nfsd_drc_lock
);
1578 nfsd_drc_mem_used
-= slotsize
* ca
->maxreqs
;
1579 spin_unlock(&nfsd_drc_lock
);
1582 static struct nfsd4_session
*alloc_session(struct nfsd4_channel_attrs
*fattrs
,
1583 struct nfsd4_channel_attrs
*battrs
)
1585 int numslots
= fattrs
->maxreqs
;
1586 int slotsize
= slot_bytes(fattrs
);
1587 struct nfsd4_session
*new;
1590 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION
* sizeof(struct nfsd4_slot
*)
1591 + sizeof(struct nfsd4_session
) > PAGE_SIZE
);
1592 mem
= numslots
* sizeof(struct nfsd4_slot
*);
1594 new = kzalloc(sizeof(*new) + mem
, GFP_KERNEL
);
1597 /* allocate each struct nfsd4_slot and data cache in one piece */
1598 for (i
= 0; i
< numslots
; i
++) {
1599 new->se_slots
[i
] = kzalloc(slotsize
, GFP_KERNEL
);
1600 if (!new->se_slots
[i
])
1604 memcpy(&new->se_fchannel
, fattrs
, sizeof(struct nfsd4_channel_attrs
));
1605 memcpy(&new->se_bchannel
, battrs
, sizeof(struct nfsd4_channel_attrs
));
1610 kfree(new->se_slots
[i
]);
1615 static void free_conn(struct nfsd4_conn
*c
)
1617 svc_xprt_put(c
->cn_xprt
);
1621 static void nfsd4_conn_lost(struct svc_xpt_user
*u
)
1623 struct nfsd4_conn
*c
= container_of(u
, struct nfsd4_conn
, cn_xpt_user
);
1624 struct nfs4_client
*clp
= c
->cn_session
->se_client
;
1626 spin_lock(&clp
->cl_lock
);
1627 if (!list_empty(&c
->cn_persession
)) {
1628 list_del(&c
->cn_persession
);
1631 nfsd4_probe_callback(clp
);
1632 spin_unlock(&clp
->cl_lock
);
1635 static struct nfsd4_conn
*alloc_conn(struct svc_rqst
*rqstp
, u32 flags
)
1637 struct nfsd4_conn
*conn
;
1639 conn
= kmalloc(sizeof(struct nfsd4_conn
), GFP_KERNEL
);
1642 svc_xprt_get(rqstp
->rq_xprt
);
1643 conn
->cn_xprt
= rqstp
->rq_xprt
;
1644 conn
->cn_flags
= flags
;
1645 INIT_LIST_HEAD(&conn
->cn_xpt_user
.list
);
1649 static void __nfsd4_hash_conn(struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1651 conn
->cn_session
= ses
;
1652 list_add(&conn
->cn_persession
, &ses
->se_conns
);
1655 static void nfsd4_hash_conn(struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1657 struct nfs4_client
*clp
= ses
->se_client
;
1659 spin_lock(&clp
->cl_lock
);
1660 __nfsd4_hash_conn(conn
, ses
);
1661 spin_unlock(&clp
->cl_lock
);
1664 static int nfsd4_register_conn(struct nfsd4_conn
*conn
)
1666 conn
->cn_xpt_user
.callback
= nfsd4_conn_lost
;
1667 return register_xpt_user(conn
->cn_xprt
, &conn
->cn_xpt_user
);
1670 static void nfsd4_init_conn(struct svc_rqst
*rqstp
, struct nfsd4_conn
*conn
, struct nfsd4_session
*ses
)
1674 nfsd4_hash_conn(conn
, ses
);
1675 ret
= nfsd4_register_conn(conn
);
1677 /* oops; xprt is already down: */
1678 nfsd4_conn_lost(&conn
->cn_xpt_user
);
1679 /* We may have gained or lost a callback channel: */
1680 nfsd4_probe_callback_sync(ses
->se_client
);
1683 static struct nfsd4_conn
*alloc_conn_from_crses(struct svc_rqst
*rqstp
, struct nfsd4_create_session
*cses
)
1685 u32 dir
= NFS4_CDFC4_FORE
;
1687 if (cses
->flags
& SESSION4_BACK_CHAN
)
1688 dir
|= NFS4_CDFC4_BACK
;
1689 return alloc_conn(rqstp
, dir
);
1692 /* must be called under client_lock */
1693 static void nfsd4_del_conns(struct nfsd4_session
*s
)
1695 struct nfs4_client
*clp
= s
->se_client
;
1696 struct nfsd4_conn
*c
;
1698 spin_lock(&clp
->cl_lock
);
1699 while (!list_empty(&s
->se_conns
)) {
1700 c
= list_first_entry(&s
->se_conns
, struct nfsd4_conn
, cn_persession
);
1701 list_del_init(&c
->cn_persession
);
1702 spin_unlock(&clp
->cl_lock
);
1704 unregister_xpt_user(c
->cn_xprt
, &c
->cn_xpt_user
);
1707 spin_lock(&clp
->cl_lock
);
1709 spin_unlock(&clp
->cl_lock
);
1712 static void __free_session(struct nfsd4_session
*ses
)
1714 free_session_slots(ses
);
1718 static void free_session(struct nfsd4_session
*ses
)
1720 nfsd4_del_conns(ses
);
1721 nfsd4_put_drc_mem(&ses
->se_fchannel
);
1722 __free_session(ses
);
1725 static void init_session(struct svc_rqst
*rqstp
, struct nfsd4_session
*new, struct nfs4_client
*clp
, struct nfsd4_create_session
*cses
)
1728 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
1730 new->se_client
= clp
;
1733 INIT_LIST_HEAD(&new->se_conns
);
1735 new->se_cb_seq_nr
= 1;
1736 new->se_flags
= cses
->flags
;
1737 new->se_cb_prog
= cses
->callback_prog
;
1738 new->se_cb_sec
= cses
->cb_sec
;
1739 atomic_set(&new->se_ref
, 0);
1740 idx
= hash_sessionid(&new->se_sessionid
);
1741 list_add(&new->se_hash
, &nn
->sessionid_hashtbl
[idx
]);
1742 spin_lock(&clp
->cl_lock
);
1743 list_add(&new->se_perclnt
, &clp
->cl_sessions
);
1744 spin_unlock(&clp
->cl_lock
);
1747 struct sockaddr
*sa
= svc_addr(rqstp
);
1749 * This is a little silly; with sessions there's no real
1750 * use for the callback address. Use the peer address
1751 * as a reasonable default for now, but consider fixing
1752 * the rpc client not to require an address in the
1755 rpc_copy_addr((struct sockaddr
*)&clp
->cl_cb_conn
.cb_addr
, sa
);
1756 clp
->cl_cb_conn
.cb_addrlen
= svc_addr_len(sa
);
1760 /* caller must hold client_lock */
1761 static struct nfsd4_session
*
1762 __find_in_sessionid_hashtbl(struct nfs4_sessionid
*sessionid
, struct net
*net
)
1764 struct nfsd4_session
*elem
;
1766 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
1768 lockdep_assert_held(&nn
->client_lock
);
1770 dump_sessionid(__func__
, sessionid
);
1771 idx
= hash_sessionid(sessionid
);
1772 /* Search in the appropriate list */
1773 list_for_each_entry(elem
, &nn
->sessionid_hashtbl
[idx
], se_hash
) {
1774 if (!memcmp(elem
->se_sessionid
.data
, sessionid
->data
,
1775 NFS4_MAX_SESSIONID_LEN
)) {
1780 dprintk("%s: session not found\n", __func__
);
1784 static struct nfsd4_session
*
1785 find_in_sessionid_hashtbl(struct nfs4_sessionid
*sessionid
, struct net
*net
,
1788 struct nfsd4_session
*session
;
1789 __be32 status
= nfserr_badsession
;
1791 session
= __find_in_sessionid_hashtbl(sessionid
, net
);
1794 status
= nfsd4_get_session_locked(session
);
1802 /* caller must hold client_lock */
1804 unhash_session(struct nfsd4_session
*ses
)
1806 struct nfs4_client
*clp
= ses
->se_client
;
1807 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1809 lockdep_assert_held(&nn
->client_lock
);
1811 list_del(&ses
->se_hash
);
1812 spin_lock(&ses
->se_client
->cl_lock
);
1813 list_del(&ses
->se_perclnt
);
1814 spin_unlock(&ses
->se_client
->cl_lock
);
1817 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1819 STALE_CLIENTID(clientid_t
*clid
, struct nfsd_net
*nn
)
1822 * We're assuming the clid was not given out from a boot
1823 * precisely 2^32 (about 136 years) before this one. That seems
1824 * a safe assumption:
1826 if (clid
->cl_boot
== (u32
)nn
->boot_time
)
1828 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1829 clid
->cl_boot
, clid
->cl_id
, nn
->boot_time
);
1834 * XXX Should we use a slab cache ?
1835 * This type of memory management is somewhat inefficient, but we use it
1836 * anyway since SETCLIENTID is not a common operation.
1838 static struct nfs4_client
*alloc_client(struct xdr_netobj name
)
1840 struct nfs4_client
*clp
;
1843 clp
= kmem_cache_zalloc(client_slab
, GFP_KERNEL
);
1846 clp
->cl_name
.data
= kmemdup(name
.data
, name
.len
, GFP_KERNEL
);
1847 if (clp
->cl_name
.data
== NULL
)
1849 clp
->cl_ownerstr_hashtbl
= kmalloc_array(OWNER_HASH_SIZE
,
1850 sizeof(struct list_head
),
1852 if (!clp
->cl_ownerstr_hashtbl
)
1853 goto err_no_hashtbl
;
1854 for (i
= 0; i
< OWNER_HASH_SIZE
; i
++)
1855 INIT_LIST_HEAD(&clp
->cl_ownerstr_hashtbl
[i
]);
1856 clp
->cl_name
.len
= name
.len
;
1857 INIT_LIST_HEAD(&clp
->cl_sessions
);
1858 idr_init(&clp
->cl_stateids
);
1859 atomic_set(&clp
->cl_refcount
, 0);
1860 clp
->cl_cb_state
= NFSD4_CB_UNKNOWN
;
1861 INIT_LIST_HEAD(&clp
->cl_idhash
);
1862 INIT_LIST_HEAD(&clp
->cl_openowners
);
1863 INIT_LIST_HEAD(&clp
->cl_delegations
);
1864 INIT_LIST_HEAD(&clp
->cl_lru
);
1865 INIT_LIST_HEAD(&clp
->cl_revoked
);
1866 #ifdef CONFIG_NFSD_PNFS
1867 INIT_LIST_HEAD(&clp
->cl_lo_states
);
1869 INIT_LIST_HEAD(&clp
->async_copies
);
1870 spin_lock_init(&clp
->async_lock
);
1871 spin_lock_init(&clp
->cl_lock
);
1872 rpc_init_wait_queue(&clp
->cl_cb_waitq
, "Backchannel slot table");
1875 kfree(clp
->cl_name
.data
);
1877 kmem_cache_free(client_slab
, clp
);
1882 free_client(struct nfs4_client
*clp
)
1884 while (!list_empty(&clp
->cl_sessions
)) {
1885 struct nfsd4_session
*ses
;
1886 ses
= list_entry(clp
->cl_sessions
.next
, struct nfsd4_session
,
1888 list_del(&ses
->se_perclnt
);
1889 WARN_ON_ONCE(atomic_read(&ses
->se_ref
));
1892 rpc_destroy_wait_queue(&clp
->cl_cb_waitq
);
1893 free_svc_cred(&clp
->cl_cred
);
1894 kfree(clp
->cl_ownerstr_hashtbl
);
1895 kfree(clp
->cl_name
.data
);
1896 idr_destroy(&clp
->cl_stateids
);
1897 kmem_cache_free(client_slab
, clp
);
1900 /* must be called under the client_lock */
1902 unhash_client_locked(struct nfs4_client
*clp
)
1904 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1905 struct nfsd4_session
*ses
;
1907 lockdep_assert_held(&nn
->client_lock
);
1909 /* Mark the client as expired! */
1911 /* Make it invisible */
1912 if (!list_empty(&clp
->cl_idhash
)) {
1913 list_del_init(&clp
->cl_idhash
);
1914 if (test_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
))
1915 rb_erase(&clp
->cl_namenode
, &nn
->conf_name_tree
);
1917 rb_erase(&clp
->cl_namenode
, &nn
->unconf_name_tree
);
1919 list_del_init(&clp
->cl_lru
);
1920 spin_lock(&clp
->cl_lock
);
1921 list_for_each_entry(ses
, &clp
->cl_sessions
, se_perclnt
)
1922 list_del_init(&ses
->se_hash
);
1923 spin_unlock(&clp
->cl_lock
);
1927 unhash_client(struct nfs4_client
*clp
)
1929 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
1931 spin_lock(&nn
->client_lock
);
1932 unhash_client_locked(clp
);
1933 spin_unlock(&nn
->client_lock
);
1936 static __be32
mark_client_expired_locked(struct nfs4_client
*clp
)
1938 if (atomic_read(&clp
->cl_refcount
))
1939 return nfserr_jukebox
;
1940 unhash_client_locked(clp
);
1945 __destroy_client(struct nfs4_client
*clp
)
1948 struct nfs4_openowner
*oo
;
1949 struct nfs4_delegation
*dp
;
1950 struct list_head reaplist
;
1952 INIT_LIST_HEAD(&reaplist
);
1953 spin_lock(&state_lock
);
1954 while (!list_empty(&clp
->cl_delegations
)) {
1955 dp
= list_entry(clp
->cl_delegations
.next
, struct nfs4_delegation
, dl_perclnt
);
1956 WARN_ON(!unhash_delegation_locked(dp
));
1957 list_add(&dp
->dl_recall_lru
, &reaplist
);
1959 spin_unlock(&state_lock
);
1960 while (!list_empty(&reaplist
)) {
1961 dp
= list_entry(reaplist
.next
, struct nfs4_delegation
, dl_recall_lru
);
1962 list_del_init(&dp
->dl_recall_lru
);
1963 destroy_unhashed_deleg(dp
);
1965 while (!list_empty(&clp
->cl_revoked
)) {
1966 dp
= list_entry(clp
->cl_revoked
.next
, struct nfs4_delegation
, dl_recall_lru
);
1967 list_del_init(&dp
->dl_recall_lru
);
1968 nfs4_put_stid(&dp
->dl_stid
);
1970 while (!list_empty(&clp
->cl_openowners
)) {
1971 oo
= list_entry(clp
->cl_openowners
.next
, struct nfs4_openowner
, oo_perclient
);
1972 nfs4_get_stateowner(&oo
->oo_owner
);
1973 release_openowner(oo
);
1975 for (i
= 0; i
< OWNER_HASH_SIZE
; i
++) {
1976 struct nfs4_stateowner
*so
, *tmp
;
1978 list_for_each_entry_safe(so
, tmp
, &clp
->cl_ownerstr_hashtbl
[i
],
1980 /* Should be no openowners at this point */
1981 WARN_ON_ONCE(so
->so_is_open_owner
);
1982 remove_blocked_locks(lockowner(so
));
1985 nfsd4_return_all_client_layouts(clp
);
1986 nfsd4_shutdown_copy(clp
);
1987 nfsd4_shutdown_callback(clp
);
1988 if (clp
->cl_cb_conn
.cb_xprt
)
1989 svc_xprt_put(clp
->cl_cb_conn
.cb_xprt
);
1994 destroy_client(struct nfs4_client
*clp
)
1997 __destroy_client(clp
);
2000 static void expire_client(struct nfs4_client
*clp
)
2003 nfsd4_client_record_remove(clp
);
2004 __destroy_client(clp
);
2007 static void copy_verf(struct nfs4_client
*target
, nfs4_verifier
*source
)
2009 memcpy(target
->cl_verifier
.data
, source
->data
,
2010 sizeof(target
->cl_verifier
.data
));
2013 static void copy_clid(struct nfs4_client
*target
, struct nfs4_client
*source
)
2015 target
->cl_clientid
.cl_boot
= source
->cl_clientid
.cl_boot
;
2016 target
->cl_clientid
.cl_id
= source
->cl_clientid
.cl_id
;
2019 static int copy_cred(struct svc_cred
*target
, struct svc_cred
*source
)
2021 target
->cr_principal
= kstrdup(source
->cr_principal
, GFP_KERNEL
);
2022 target
->cr_raw_principal
= kstrdup(source
->cr_raw_principal
,
2024 target
->cr_targ_princ
= kstrdup(source
->cr_targ_princ
, GFP_KERNEL
);
2025 if ((source
->cr_principal
&& !target
->cr_principal
) ||
2026 (source
->cr_raw_principal
&& !target
->cr_raw_principal
) ||
2027 (source
->cr_targ_princ
&& !target
->cr_targ_princ
))
2030 target
->cr_flavor
= source
->cr_flavor
;
2031 target
->cr_uid
= source
->cr_uid
;
2032 target
->cr_gid
= source
->cr_gid
;
2033 target
->cr_group_info
= source
->cr_group_info
;
2034 get_group_info(target
->cr_group_info
);
2035 target
->cr_gss_mech
= source
->cr_gss_mech
;
2036 if (source
->cr_gss_mech
)
2037 gss_mech_get(source
->cr_gss_mech
);
2042 compare_blob(const struct xdr_netobj
*o1
, const struct xdr_netobj
*o2
)
2044 if (o1
->len
< o2
->len
)
2046 if (o1
->len
> o2
->len
)
2048 return memcmp(o1
->data
, o2
->data
, o1
->len
);
2051 static int same_name(const char *n1
, const char *n2
)
2053 return 0 == memcmp(n1
, n2
, HEXDIR_LEN
);
2057 same_verf(nfs4_verifier
*v1
, nfs4_verifier
*v2
)
2059 return 0 == memcmp(v1
->data
, v2
->data
, sizeof(v1
->data
));
2063 same_clid(clientid_t
*cl1
, clientid_t
*cl2
)
2065 return (cl1
->cl_boot
== cl2
->cl_boot
) && (cl1
->cl_id
== cl2
->cl_id
);
2068 static bool groups_equal(struct group_info
*g1
, struct group_info
*g2
)
2072 if (g1
->ngroups
!= g2
->ngroups
)
2074 for (i
=0; i
<g1
->ngroups
; i
++)
2075 if (!gid_eq(g1
->gid
[i
], g2
->gid
[i
]))
2081 * RFC 3530 language requires clid_inuse be returned when the
2082 * "principal" associated with a requests differs from that previously
2083 * used. We use uid, gid's, and gss principal string as our best
2084 * approximation. We also don't want to allow non-gss use of a client
2085 * established using gss: in theory cr_principal should catch that
2086 * change, but in practice cr_principal can be null even in the gss case
2087 * since gssd doesn't always pass down a principal string.
2089 static bool is_gss_cred(struct svc_cred
*cr
)
2091 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2092 return (cr
->cr_flavor
> RPC_AUTH_MAXFLAVOR
);
2097 same_creds(struct svc_cred
*cr1
, struct svc_cred
*cr2
)
2099 if ((is_gss_cred(cr1
) != is_gss_cred(cr2
))
2100 || (!uid_eq(cr1
->cr_uid
, cr2
->cr_uid
))
2101 || (!gid_eq(cr1
->cr_gid
, cr2
->cr_gid
))
2102 || !groups_equal(cr1
->cr_group_info
, cr2
->cr_group_info
))
2104 /* XXX: check that cr_targ_princ fields match ? */
2105 if (cr1
->cr_principal
== cr2
->cr_principal
)
2107 if (!cr1
->cr_principal
|| !cr2
->cr_principal
)
2109 return 0 == strcmp(cr1
->cr_principal
, cr2
->cr_principal
);
2112 static bool svc_rqst_integrity_protected(struct svc_rqst
*rqstp
)
2114 struct svc_cred
*cr
= &rqstp
->rq_cred
;
2117 if (!cr
->cr_gss_mech
)
2119 service
= gss_pseudoflavor_to_service(cr
->cr_gss_mech
, cr
->cr_flavor
);
2120 return service
== RPC_GSS_SVC_INTEGRITY
||
2121 service
== RPC_GSS_SVC_PRIVACY
;
2124 bool nfsd4_mach_creds_match(struct nfs4_client
*cl
, struct svc_rqst
*rqstp
)
2126 struct svc_cred
*cr
= &rqstp
->rq_cred
;
2128 if (!cl
->cl_mach_cred
)
2130 if (cl
->cl_cred
.cr_gss_mech
!= cr
->cr_gss_mech
)
2132 if (!svc_rqst_integrity_protected(rqstp
))
2134 if (cl
->cl_cred
.cr_raw_principal
)
2135 return 0 == strcmp(cl
->cl_cred
.cr_raw_principal
,
2136 cr
->cr_raw_principal
);
2137 if (!cr
->cr_principal
)
2139 return 0 == strcmp(cl
->cl_cred
.cr_principal
, cr
->cr_principal
);
2142 static void gen_confirm(struct nfs4_client
*clp
, struct nfsd_net
*nn
)
2147 * This is opaque to client, so no need to byte-swap. Use
2148 * __force to keep sparse happy
2150 verf
[0] = (__force __be32
)get_seconds();
2151 verf
[1] = (__force __be32
)nn
->clverifier_counter
++;
2152 memcpy(clp
->cl_confirm
.data
, verf
, sizeof(clp
->cl_confirm
.data
));
2155 static void gen_clid(struct nfs4_client
*clp
, struct nfsd_net
*nn
)
2157 clp
->cl_clientid
.cl_boot
= nn
->boot_time
;
2158 clp
->cl_clientid
.cl_id
= nn
->clientid_counter
++;
2159 gen_confirm(clp
, nn
);
2162 static struct nfs4_stid
*
2163 find_stateid_locked(struct nfs4_client
*cl
, stateid_t
*t
)
2165 struct nfs4_stid
*ret
;
2167 ret
= idr_find(&cl
->cl_stateids
, t
->si_opaque
.so_id
);
2168 if (!ret
|| !ret
->sc_type
)
2173 static struct nfs4_stid
*
2174 find_stateid_by_type(struct nfs4_client
*cl
, stateid_t
*t
, char typemask
)
2176 struct nfs4_stid
*s
;
2178 spin_lock(&cl
->cl_lock
);
2179 s
= find_stateid_locked(cl
, t
);
2181 if (typemask
& s
->sc_type
)
2182 refcount_inc(&s
->sc_count
);
2186 spin_unlock(&cl
->cl_lock
);
2190 static struct nfs4_client
*create_client(struct xdr_netobj name
,
2191 struct svc_rqst
*rqstp
, nfs4_verifier
*verf
)
2193 struct nfs4_client
*clp
;
2194 struct sockaddr
*sa
= svc_addr(rqstp
);
2196 struct net
*net
= SVC_NET(rqstp
);
2198 clp
= alloc_client(name
);
2202 ret
= copy_cred(&clp
->cl_cred
, &rqstp
->rq_cred
);
2207 nfsd4_init_cb(&clp
->cl_cb_null
, clp
, NULL
, NFSPROC4_CLNT_CB_NULL
);
2208 clp
->cl_time
= get_seconds();
2209 clear_bit(0, &clp
->cl_cb_slot_busy
);
2210 copy_verf(clp
, verf
);
2211 rpc_copy_addr((struct sockaddr
*) &clp
->cl_addr
, sa
);
2212 clp
->cl_cb_session
= NULL
;
2218 add_clp_to_name_tree(struct nfs4_client
*new_clp
, struct rb_root
*root
)
2220 struct rb_node
**new = &(root
->rb_node
), *parent
= NULL
;
2221 struct nfs4_client
*clp
;
2224 clp
= rb_entry(*new, struct nfs4_client
, cl_namenode
);
2227 if (compare_blob(&clp
->cl_name
, &new_clp
->cl_name
) > 0)
2228 new = &((*new)->rb_left
);
2230 new = &((*new)->rb_right
);
2233 rb_link_node(&new_clp
->cl_namenode
, parent
, new);
2234 rb_insert_color(&new_clp
->cl_namenode
, root
);
2237 static struct nfs4_client
*
2238 find_clp_in_name_tree(struct xdr_netobj
*name
, struct rb_root
*root
)
2241 struct rb_node
*node
= root
->rb_node
;
2242 struct nfs4_client
*clp
;
2245 clp
= rb_entry(node
, struct nfs4_client
, cl_namenode
);
2246 cmp
= compare_blob(&clp
->cl_name
, name
);
2248 node
= node
->rb_left
;
2250 node
= node
->rb_right
;
2258 add_to_unconfirmed(struct nfs4_client
*clp
)
2260 unsigned int idhashval
;
2261 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
2263 lockdep_assert_held(&nn
->client_lock
);
2265 clear_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
);
2266 add_clp_to_name_tree(clp
, &nn
->unconf_name_tree
);
2267 idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
2268 list_add(&clp
->cl_idhash
, &nn
->unconf_id_hashtbl
[idhashval
]);
2269 renew_client_locked(clp
);
2273 move_to_confirmed(struct nfs4_client
*clp
)
2275 unsigned int idhashval
= clientid_hashval(clp
->cl_clientid
.cl_id
);
2276 struct nfsd_net
*nn
= net_generic(clp
->net
, nfsd_net_id
);
2278 lockdep_assert_held(&nn
->client_lock
);
2280 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp
);
2281 list_move(&clp
->cl_idhash
, &nn
->conf_id_hashtbl
[idhashval
]);
2282 rb_erase(&clp
->cl_namenode
, &nn
->unconf_name_tree
);
2283 add_clp_to_name_tree(clp
, &nn
->conf_name_tree
);
2284 set_bit(NFSD4_CLIENT_CONFIRMED
, &clp
->cl_flags
);
2285 renew_client_locked(clp
);
2288 static struct nfs4_client
*
2289 find_client_in_id_table(struct list_head
*tbl
, clientid_t
*clid
, bool sessions
)
2291 struct nfs4_client
*clp
;
2292 unsigned int idhashval
= clientid_hashval(clid
->cl_id
);
2294 list_for_each_entry(clp
, &tbl
[idhashval
], cl_idhash
) {
2295 if (same_clid(&clp
->cl_clientid
, clid
)) {
2296 if ((bool)clp
->cl_minorversion
!= sessions
)
2298 renew_client_locked(clp
);
2305 static struct nfs4_client
*
2306 find_confirmed_client(clientid_t
*clid
, bool sessions
, struct nfsd_net
*nn
)
2308 struct list_head
*tbl
= nn
->conf_id_hashtbl
;
2310 lockdep_assert_held(&nn
->client_lock
);
2311 return find_client_in_id_table(tbl
, clid
, sessions
);
2314 static struct nfs4_client
*
2315 find_unconfirmed_client(clientid_t
*clid
, bool sessions
, struct nfsd_net
*nn
)
2317 struct list_head
*tbl
= nn
->unconf_id_hashtbl
;
2319 lockdep_assert_held(&nn
->client_lock
);
2320 return find_client_in_id_table(tbl
, clid
, sessions
);
2323 static bool clp_used_exchangeid(struct nfs4_client
*clp
)
2325 return clp
->cl_exchange_flags
!= 0;
2328 static struct nfs4_client
*
2329 find_confirmed_client_by_name(struct xdr_netobj
*name
, struct nfsd_net
*nn
)
2331 lockdep_assert_held(&nn
->client_lock
);
2332 return find_clp_in_name_tree(name
, &nn
->conf_name_tree
);
2335 static struct nfs4_client
*
2336 find_unconfirmed_client_by_name(struct xdr_netobj
*name
, struct nfsd_net
*nn
)
2338 lockdep_assert_held(&nn
->client_lock
);
2339 return find_clp_in_name_tree(name
, &nn
->unconf_name_tree
);
2343 gen_callback(struct nfs4_client
*clp
, struct nfsd4_setclientid
*se
, struct svc_rqst
*rqstp
)
2345 struct nfs4_cb_conn
*conn
= &clp
->cl_cb_conn
;
2346 struct sockaddr
*sa
= svc_addr(rqstp
);
2347 u32 scopeid
= rpc_get_scope_id(sa
);
2348 unsigned short expected_family
;
2350 /* Currently, we only support tcp and tcp6 for the callback channel */
2351 if (se
->se_callback_netid_len
== 3 &&
2352 !memcmp(se
->se_callback_netid_val
, "tcp", 3))
2353 expected_family
= AF_INET
;
2354 else if (se
->se_callback_netid_len
== 4 &&
2355 !memcmp(se
->se_callback_netid_val
, "tcp6", 4))
2356 expected_family
= AF_INET6
;
2360 conn
->cb_addrlen
= rpc_uaddr2sockaddr(clp
->net
, se
->se_callback_addr_val
,
2361 se
->se_callback_addr_len
,
2362 (struct sockaddr
*)&conn
->cb_addr
,
2363 sizeof(conn
->cb_addr
));
2365 if (!conn
->cb_addrlen
|| conn
->cb_addr
.ss_family
!= expected_family
)
2368 if (conn
->cb_addr
.ss_family
== AF_INET6
)
2369 ((struct sockaddr_in6
*)&conn
->cb_addr
)->sin6_scope_id
= scopeid
;
2371 conn
->cb_prog
= se
->se_callback_prog
;
2372 conn
->cb_ident
= se
->se_callback_ident
;
2373 memcpy(&conn
->cb_saddr
, &rqstp
->rq_daddr
, rqstp
->rq_daddrlen
);
2376 conn
->cb_addr
.ss_family
= AF_UNSPEC
;
2377 conn
->cb_addrlen
= 0;
2378 dprintk("NFSD: this client (clientid %08x/%08x) "
2379 "will not receive delegations\n",
2380 clp
->cl_clientid
.cl_boot
, clp
->cl_clientid
.cl_id
);
2386 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2389 nfsd4_store_cache_entry(struct nfsd4_compoundres
*resp
)
2391 struct xdr_buf
*buf
= resp
->xdr
.buf
;
2392 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2395 dprintk("--> %s slot %p\n", __func__
, slot
);
2397 slot
->sl_flags
|= NFSD4_SLOT_INITIALIZED
;
2398 slot
->sl_opcnt
= resp
->opcnt
;
2399 slot
->sl_status
= resp
->cstate
.status
;
2400 free_svc_cred(&slot
->sl_cred
);
2401 copy_cred(&slot
->sl_cred
, &resp
->rqstp
->rq_cred
);
2403 if (!nfsd4_cache_this(resp
)) {
2404 slot
->sl_flags
&= ~NFSD4_SLOT_CACHED
;
2407 slot
->sl_flags
|= NFSD4_SLOT_CACHED
;
2409 base
= resp
->cstate
.data_offset
;
2410 slot
->sl_datalen
= buf
->len
- base
;
2411 if (read_bytes_from_xdr_buf(buf
, base
, slot
->sl_data
, slot
->sl_datalen
))
2412 WARN(1, "%s: sessions DRC could not cache compound\n",
2418 * Encode the replay sequence operation from the slot values.
2419 * If cachethis is FALSE encode the uncached rep error on the next
2420 * operation which sets resp->p and increments resp->opcnt for
2421 * nfs4svc_encode_compoundres.
2425 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs
*args
,
2426 struct nfsd4_compoundres
*resp
)
2428 struct nfsd4_op
*op
;
2429 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2431 /* Encode the replayed sequence operation */
2432 op
= &args
->ops
[resp
->opcnt
- 1];
2433 nfsd4_encode_operation(resp
, op
);
2435 if (slot
->sl_flags
& NFSD4_SLOT_CACHED
)
2437 if (args
->opcnt
== 1) {
2439 * The original operation wasn't a solo sequence--we
2440 * always cache those--so this retry must not match the
2443 op
->status
= nfserr_seq_false_retry
;
2445 op
= &args
->ops
[resp
->opcnt
++];
2446 op
->status
= nfserr_retry_uncached_rep
;
2447 nfsd4_encode_operation(resp
, op
);
2453 * The sequence operation is not cached because we can use the slot and
2457 nfsd4_replay_cache_entry(struct nfsd4_compoundres
*resp
,
2458 struct nfsd4_sequence
*seq
)
2460 struct nfsd4_slot
*slot
= resp
->cstate
.slot
;
2461 struct xdr_stream
*xdr
= &resp
->xdr
;
2465 dprintk("--> %s slot %p\n", __func__
, slot
);
2467 status
= nfsd4_enc_sequence_replay(resp
->rqstp
->rq_argp
, resp
);
2471 p
= xdr_reserve_space(xdr
, slot
->sl_datalen
);
2474 return nfserr_serverfault
;
2476 xdr_encode_opaque_fixed(p
, slot
->sl_data
, slot
->sl_datalen
);
2477 xdr_commit_encode(xdr
);
2479 resp
->opcnt
= slot
->sl_opcnt
;
2480 return slot
->sl_status
;
2484 * Set the exchange_id flags returned by the server.
2487 nfsd4_set_ex_flags(struct nfs4_client
*new, struct nfsd4_exchange_id
*clid
)
2489 #ifdef CONFIG_NFSD_PNFS
2490 new->cl_exchange_flags
|= EXCHGID4_FLAG_USE_PNFS_MDS
;
2492 new->cl_exchange_flags
|= EXCHGID4_FLAG_USE_NON_PNFS
;
2495 /* Referrals are supported, Migration is not. */
2496 new->cl_exchange_flags
|= EXCHGID4_FLAG_SUPP_MOVED_REFER
;
2498 /* set the wire flags to return to client. */
2499 clid
->flags
= new->cl_exchange_flags
;
2502 static bool client_has_openowners(struct nfs4_client
*clp
)
2504 struct nfs4_openowner
*oo
;
2506 list_for_each_entry(oo
, &clp
->cl_openowners
, oo_perclient
) {
2507 if (!list_empty(&oo
->oo_owner
.so_stateids
))
2513 static bool client_has_state(struct nfs4_client
*clp
)
2515 return client_has_openowners(clp
)
2516 #ifdef CONFIG_NFSD_PNFS
2517 || !list_empty(&clp
->cl_lo_states
)
2519 || !list_empty(&clp
->cl_delegations
)
2520 || !list_empty(&clp
->cl_sessions
)
2521 || !list_empty(&clp
->async_copies
);
2525 nfsd4_exchange_id(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
2526 union nfsd4_op_u
*u
)
2528 struct nfsd4_exchange_id
*exid
= &u
->exchange_id
;
2529 struct nfs4_client
*conf
, *new;
2530 struct nfs4_client
*unconf
= NULL
;
2532 char addr_str
[INET6_ADDRSTRLEN
];
2533 nfs4_verifier verf
= exid
->verifier
;
2534 struct sockaddr
*sa
= svc_addr(rqstp
);
2535 bool update
= exid
->flags
& EXCHGID4_FLAG_UPD_CONFIRMED_REC_A
;
2536 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2538 rpc_ntop(sa
, addr_str
, sizeof(addr_str
));
2539 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2540 "ip_addr=%s flags %x, spa_how %d\n",
2541 __func__
, rqstp
, exid
, exid
->clname
.len
, exid
->clname
.data
,
2542 addr_str
, exid
->flags
, exid
->spa_how
);
2544 if (exid
->flags
& ~EXCHGID4_FLAG_MASK_A
)
2545 return nfserr_inval
;
2547 new = create_client(exid
->clname
, rqstp
, &verf
);
2549 return nfserr_jukebox
;
2551 switch (exid
->spa_how
) {
2553 exid
->spo_must_enforce
[0] = 0;
2554 exid
->spo_must_enforce
[1] = (
2555 1 << (OP_BIND_CONN_TO_SESSION
- 32) |
2556 1 << (OP_EXCHANGE_ID
- 32) |
2557 1 << (OP_CREATE_SESSION
- 32) |
2558 1 << (OP_DESTROY_SESSION
- 32) |
2559 1 << (OP_DESTROY_CLIENTID
- 32));
2561 exid
->spo_must_allow
[0] &= (1 << (OP_CLOSE
) |
2562 1 << (OP_OPEN_DOWNGRADE
) |
2564 1 << (OP_DELEGRETURN
));
2566 exid
->spo_must_allow
[1] &= (
2567 1 << (OP_TEST_STATEID
- 32) |
2568 1 << (OP_FREE_STATEID
- 32));
2569 if (!svc_rqst_integrity_protected(rqstp
)) {
2570 status
= nfserr_inval
;
2574 * Sometimes userspace doesn't give us a principal.
2575 * Which is a bug, really. Anyway, we can't enforce
2576 * MACH_CRED in that case, better to give up now:
2578 if (!new->cl_cred
.cr_principal
&&
2579 !new->cl_cred
.cr_raw_principal
) {
2580 status
= nfserr_serverfault
;
2583 new->cl_mach_cred
= true;
2586 default: /* checked by xdr code */
2589 status
= nfserr_encr_alg_unsupp
;
2593 /* Cases below refer to rfc 5661 section 18.35.4: */
2594 spin_lock(&nn
->client_lock
);
2595 conf
= find_confirmed_client_by_name(&exid
->clname
, nn
);
2597 bool creds_match
= same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
);
2598 bool verfs_match
= same_verf(&verf
, &conf
->cl_verifier
);
2601 if (!clp_used_exchangeid(conf
)) { /* buggy client */
2602 status
= nfserr_inval
;
2605 if (!nfsd4_mach_creds_match(conf
, rqstp
)) {
2606 status
= nfserr_wrong_cred
;
2609 if (!creds_match
) { /* case 9 */
2610 status
= nfserr_perm
;
2613 if (!verfs_match
) { /* case 8 */
2614 status
= nfserr_not_same
;
2618 exid
->flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2621 if (!creds_match
) { /* case 3 */
2622 if (client_has_state(conf
)) {
2623 status
= nfserr_clid_inuse
;
2628 if (verfs_match
) { /* case 2 */
2629 conf
->cl_exchange_flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2632 /* case 5, client reboot */
2637 if (update
) { /* case 7 */
2638 status
= nfserr_noent
;
2642 unconf
= find_unconfirmed_client_by_name(&exid
->clname
, nn
);
2643 if (unconf
) /* case 4, possible retry or client restart */
2644 unhash_client_locked(unconf
);
2646 /* case 1 (normal case) */
2649 status
= mark_client_expired_locked(conf
);
2653 new->cl_minorversion
= cstate
->minorversion
;
2654 new->cl_spo_must_allow
.u
.words
[0] = exid
->spo_must_allow
[0];
2655 new->cl_spo_must_allow
.u
.words
[1] = exid
->spo_must_allow
[1];
2658 add_to_unconfirmed(new);
2661 exid
->clientid
.cl_boot
= conf
->cl_clientid
.cl_boot
;
2662 exid
->clientid
.cl_id
= conf
->cl_clientid
.cl_id
;
2664 exid
->seqid
= conf
->cl_cs_slot
.sl_seqid
+ 1;
2665 nfsd4_set_ex_flags(conf
, exid
);
2667 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2668 conf
->cl_cs_slot
.sl_seqid
, conf
->cl_exchange_flags
);
2672 spin_unlock(&nn
->client_lock
);
2677 expire_client(unconf
);
2682 check_slot_seqid(u32 seqid
, u32 slot_seqid
, int slot_inuse
)
2684 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__
, seqid
,
2687 /* The slot is in use, and no response has been sent. */
2689 if (seqid
== slot_seqid
)
2690 return nfserr_jukebox
;
2692 return nfserr_seq_misordered
;
2694 /* Note unsigned 32-bit arithmetic handles wraparound: */
2695 if (likely(seqid
== slot_seqid
+ 1))
2697 if (seqid
== slot_seqid
)
2698 return nfserr_replay_cache
;
2699 return nfserr_seq_misordered
;
2703 * Cache the create session result into the create session single DRC
2704 * slot cache by saving the xdr structure. sl_seqid has been set.
2705 * Do this for solo or embedded create session operations.
2708 nfsd4_cache_create_session(struct nfsd4_create_session
*cr_ses
,
2709 struct nfsd4_clid_slot
*slot
, __be32 nfserr
)
2711 slot
->sl_status
= nfserr
;
2712 memcpy(&slot
->sl_cr_ses
, cr_ses
, sizeof(*cr_ses
));
2716 nfsd4_replay_create_session(struct nfsd4_create_session
*cr_ses
,
2717 struct nfsd4_clid_slot
*slot
)
2719 memcpy(cr_ses
, &slot
->sl_cr_ses
, sizeof(*cr_ses
));
2720 return slot
->sl_status
;
2723 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2724 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2725 1 + /* MIN tag is length with zero, only length */ \
2726 3 + /* version, opcount, opcode */ \
2727 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2728 /* seqid, slotID, slotID, cache */ \
2729 4 ) * sizeof(__be32))
2731 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2732 2 + /* verifier: AUTH_NULL, length 0 */\
2734 1 + /* MIN tag is length with zero, only length */ \
2735 3 + /* opcount, opcode, opstatus*/ \
2736 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2737 /* seqid, slotID, slotID, slotID, status */ \
2738 5 ) * sizeof(__be32))
2740 static __be32
check_forechannel_attrs(struct nfsd4_channel_attrs
*ca
, struct nfsd_net
*nn
)
2742 u32 maxrpc
= nn
->nfsd_serv
->sv_max_mesg
;
2744 if (ca
->maxreq_sz
< NFSD_MIN_REQ_HDR_SEQ_SZ
)
2745 return nfserr_toosmall
;
2746 if (ca
->maxresp_sz
< NFSD_MIN_RESP_HDR_SEQ_SZ
)
2747 return nfserr_toosmall
;
2748 ca
->headerpadsz
= 0;
2749 ca
->maxreq_sz
= min_t(u32
, ca
->maxreq_sz
, maxrpc
);
2750 ca
->maxresp_sz
= min_t(u32
, ca
->maxresp_sz
, maxrpc
);
2751 ca
->maxops
= min_t(u32
, ca
->maxops
, NFSD_MAX_OPS_PER_COMPOUND
);
2752 ca
->maxresp_cached
= min_t(u32
, ca
->maxresp_cached
,
2753 NFSD_SLOT_CACHE_SIZE
+ NFSD_MIN_HDR_SEQ_SZ
);
2754 ca
->maxreqs
= min_t(u32
, ca
->maxreqs
, NFSD_MAX_SLOTS_PER_SESSION
);
2756 * Note decreasing slot size below client's request may make it
2757 * difficult for client to function correctly, whereas
2758 * decreasing the number of slots will (just?) affect
2759 * performance. When short on memory we therefore prefer to
2760 * decrease number of slots instead of their size. Clients that
2761 * request larger slots than they need will get poor results:
2763 ca
->maxreqs
= nfsd4_get_drc_mem(ca
);
2765 return nfserr_jukebox
;
2771 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2772 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2774 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2775 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2777 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2778 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2780 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2781 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2782 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2783 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2786 static __be32
check_backchannel_attrs(struct nfsd4_channel_attrs
*ca
)
2788 ca
->headerpadsz
= 0;
2790 if (ca
->maxreq_sz
< NFSD_CB_MAX_REQ_SZ
)
2791 return nfserr_toosmall
;
2792 if (ca
->maxresp_sz
< NFSD_CB_MAX_RESP_SZ
)
2793 return nfserr_toosmall
;
2794 ca
->maxresp_cached
= 0;
2796 return nfserr_toosmall
;
2801 static __be32
nfsd4_check_cb_sec(struct nfsd4_cb_sec
*cbs
)
2803 switch (cbs
->flavor
) {
2809 * GSS case: the spec doesn't allow us to return this
2810 * error. But it also doesn't allow us not to support
2812 * I'd rather this fail hard than return some error the
2813 * client might think it can already handle:
2815 return nfserr_encr_alg_unsupp
;
2820 nfsd4_create_session(struct svc_rqst
*rqstp
,
2821 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
2823 struct nfsd4_create_session
*cr_ses
= &u
->create_session
;
2824 struct sockaddr
*sa
= svc_addr(rqstp
);
2825 struct nfs4_client
*conf
, *unconf
;
2826 struct nfs4_client
*old
= NULL
;
2827 struct nfsd4_session
*new;
2828 struct nfsd4_conn
*conn
;
2829 struct nfsd4_clid_slot
*cs_slot
= NULL
;
2831 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2833 if (cr_ses
->flags
& ~SESSION4_FLAG_MASK_A
)
2834 return nfserr_inval
;
2835 status
= nfsd4_check_cb_sec(&cr_ses
->cb_sec
);
2838 status
= check_forechannel_attrs(&cr_ses
->fore_channel
, nn
);
2841 status
= check_backchannel_attrs(&cr_ses
->back_channel
);
2843 goto out_release_drc_mem
;
2844 status
= nfserr_jukebox
;
2845 new = alloc_session(&cr_ses
->fore_channel
, &cr_ses
->back_channel
);
2847 goto out_release_drc_mem
;
2848 conn
= alloc_conn_from_crses(rqstp
, cr_ses
);
2850 goto out_free_session
;
2852 spin_lock(&nn
->client_lock
);
2853 unconf
= find_unconfirmed_client(&cr_ses
->clientid
, true, nn
);
2854 conf
= find_confirmed_client(&cr_ses
->clientid
, true, nn
);
2855 WARN_ON_ONCE(conf
&& unconf
);
2858 status
= nfserr_wrong_cred
;
2859 if (!nfsd4_mach_creds_match(conf
, rqstp
))
2861 cs_slot
= &conf
->cl_cs_slot
;
2862 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2864 if (status
== nfserr_replay_cache
)
2865 status
= nfsd4_replay_create_session(cr_ses
, cs_slot
);
2868 } else if (unconf
) {
2869 if (!same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
) ||
2870 !rpc_cmp_addr(sa
, (struct sockaddr
*) &unconf
->cl_addr
)) {
2871 status
= nfserr_clid_inuse
;
2874 status
= nfserr_wrong_cred
;
2875 if (!nfsd4_mach_creds_match(unconf
, rqstp
))
2877 cs_slot
= &unconf
->cl_cs_slot
;
2878 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2880 /* an unconfirmed replay returns misordered */
2881 status
= nfserr_seq_misordered
;
2884 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
2886 status
= mark_client_expired_locked(old
);
2892 move_to_confirmed(unconf
);
2895 status
= nfserr_stale_clientid
;
2899 /* Persistent sessions are not supported */
2900 cr_ses
->flags
&= ~SESSION4_PERSIST
;
2901 /* Upshifting from TCP to RDMA is not supported */
2902 cr_ses
->flags
&= ~SESSION4_RDMA
;
2904 init_session(rqstp
, new, conf
, cr_ses
);
2905 nfsd4_get_session_locked(new);
2907 memcpy(cr_ses
->sessionid
.data
, new->se_sessionid
.data
,
2908 NFS4_MAX_SESSIONID_LEN
);
2909 cs_slot
->sl_seqid
++;
2910 cr_ses
->seqid
= cs_slot
->sl_seqid
;
2912 /* cache solo and embedded create sessions under the client_lock */
2913 nfsd4_cache_create_session(cr_ses
, cs_slot
, status
);
2914 spin_unlock(&nn
->client_lock
);
2915 /* init connection and backchannel */
2916 nfsd4_init_conn(rqstp
, conn
, new);
2917 nfsd4_put_session(new);
2922 spin_unlock(&nn
->client_lock
);
2927 __free_session(new);
2928 out_release_drc_mem
:
2929 nfsd4_put_drc_mem(&cr_ses
->fore_channel
);
2933 static __be32
nfsd4_map_bcts_dir(u32
*dir
)
2936 case NFS4_CDFC4_FORE
:
2937 case NFS4_CDFC4_BACK
:
2939 case NFS4_CDFC4_FORE_OR_BOTH
:
2940 case NFS4_CDFC4_BACK_OR_BOTH
:
2941 *dir
= NFS4_CDFC4_BOTH
;
2944 return nfserr_inval
;
2947 __be32
nfsd4_backchannel_ctl(struct svc_rqst
*rqstp
,
2948 struct nfsd4_compound_state
*cstate
,
2949 union nfsd4_op_u
*u
)
2951 struct nfsd4_backchannel_ctl
*bc
= &u
->backchannel_ctl
;
2952 struct nfsd4_session
*session
= cstate
->session
;
2953 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2956 status
= nfsd4_check_cb_sec(&bc
->bc_cb_sec
);
2959 spin_lock(&nn
->client_lock
);
2960 session
->se_cb_prog
= bc
->bc_cb_program
;
2961 session
->se_cb_sec
= bc
->bc_cb_sec
;
2962 spin_unlock(&nn
->client_lock
);
2964 nfsd4_probe_callback(session
->se_client
);
2969 __be32
nfsd4_bind_conn_to_session(struct svc_rqst
*rqstp
,
2970 struct nfsd4_compound_state
*cstate
,
2971 union nfsd4_op_u
*u
)
2973 struct nfsd4_bind_conn_to_session
*bcts
= &u
->bind_conn_to_session
;
2975 struct nfsd4_conn
*conn
;
2976 struct nfsd4_session
*session
;
2977 struct net
*net
= SVC_NET(rqstp
);
2978 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
2980 if (!nfsd4_last_compound_op(rqstp
))
2981 return nfserr_not_only_op
;
2982 spin_lock(&nn
->client_lock
);
2983 session
= find_in_sessionid_hashtbl(&bcts
->sessionid
, net
, &status
);
2984 spin_unlock(&nn
->client_lock
);
2986 goto out_no_session
;
2987 status
= nfserr_wrong_cred
;
2988 if (!nfsd4_mach_creds_match(session
->se_client
, rqstp
))
2990 status
= nfsd4_map_bcts_dir(&bcts
->dir
);
2993 conn
= alloc_conn(rqstp
, bcts
->dir
);
2994 status
= nfserr_jukebox
;
2997 nfsd4_init_conn(rqstp
, conn
, session
);
3000 nfsd4_put_session(session
);
3005 static bool nfsd4_compound_in_session(struct nfsd4_compound_state
*cstate
, struct nfs4_sessionid
*sid
)
3007 if (!cstate
->session
)
3009 return !memcmp(sid
, &cstate
->session
->se_sessionid
, sizeof(*sid
));
3013 nfsd4_destroy_session(struct svc_rqst
*r
, struct nfsd4_compound_state
*cstate
,
3014 union nfsd4_op_u
*u
)
3016 struct nfs4_sessionid
*sessionid
= &u
->destroy_session
.sessionid
;
3017 struct nfsd4_session
*ses
;
3019 int ref_held_by_me
= 0;
3020 struct net
*net
= SVC_NET(r
);
3021 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
3023 status
= nfserr_not_only_op
;
3024 if (nfsd4_compound_in_session(cstate
, sessionid
)) {
3025 if (!nfsd4_last_compound_op(r
))
3029 dump_sessionid(__func__
, sessionid
);
3030 spin_lock(&nn
->client_lock
);
3031 ses
= find_in_sessionid_hashtbl(sessionid
, net
, &status
);
3033 goto out_client_lock
;
3034 status
= nfserr_wrong_cred
;
3035 if (!nfsd4_mach_creds_match(ses
->se_client
, r
))
3036 goto out_put_session
;
3037 status
= mark_session_dead_locked(ses
, 1 + ref_held_by_me
);
3039 goto out_put_session
;
3040 unhash_session(ses
);
3041 spin_unlock(&nn
->client_lock
);
3043 nfsd4_probe_callback_sync(ses
->se_client
);
3045 spin_lock(&nn
->client_lock
);
3048 nfsd4_put_session_locked(ses
);
3050 spin_unlock(&nn
->client_lock
);
3055 static struct nfsd4_conn
*__nfsd4_find_conn(struct svc_xprt
*xpt
, struct nfsd4_session
*s
)
3057 struct nfsd4_conn
*c
;
3059 list_for_each_entry(c
, &s
->se_conns
, cn_persession
) {
3060 if (c
->cn_xprt
== xpt
) {
3067 static __be32
nfsd4_sequence_check_conn(struct nfsd4_conn
*new, struct nfsd4_session
*ses
)
3069 struct nfs4_client
*clp
= ses
->se_client
;
3070 struct nfsd4_conn
*c
;
3071 __be32 status
= nfs_ok
;
3074 spin_lock(&clp
->cl_lock
);
3075 c
= __nfsd4_find_conn(new->cn_xprt
, ses
);
3078 status
= nfserr_conn_not_bound_to_session
;
3079 if (clp
->cl_mach_cred
)
3081 __nfsd4_hash_conn(new, ses
);
3082 spin_unlock(&clp
->cl_lock
);
3083 ret
= nfsd4_register_conn(new);
3085 /* oops; xprt is already down: */
3086 nfsd4_conn_lost(&new->cn_xpt_user
);
3089 spin_unlock(&clp
->cl_lock
);
3094 static bool nfsd4_session_too_many_ops(struct svc_rqst
*rqstp
, struct nfsd4_session
*session
)
3096 struct nfsd4_compoundargs
*args
= rqstp
->rq_argp
;
3098 return args
->opcnt
> session
->se_fchannel
.maxops
;
3101 static bool nfsd4_request_too_big(struct svc_rqst
*rqstp
,
3102 struct nfsd4_session
*session
)
3104 struct xdr_buf
*xb
= &rqstp
->rq_arg
;
3106 return xb
->len
> session
->se_fchannel
.maxreq_sz
;
3109 static bool replay_matches_cache(struct svc_rqst
*rqstp
,
3110 struct nfsd4_sequence
*seq
, struct nfsd4_slot
*slot
)
3112 struct nfsd4_compoundargs
*argp
= rqstp
->rq_argp
;
3114 if ((bool)(slot
->sl_flags
& NFSD4_SLOT_CACHETHIS
) !=
3115 (bool)seq
->cachethis
)
3118 * If there's an error than the reply can have fewer ops than
3119 * the call. But if we cached a reply with *more* ops than the
3120 * call you're sending us now, then this new call is clearly not
3121 * really a replay of the old one:
3123 if (slot
->sl_opcnt
< argp
->opcnt
)
3125 /* This is the only check explicitly called by spec: */
3126 if (!same_creds(&rqstp
->rq_cred
, &slot
->sl_cred
))
3129 * There may be more comparisons we could actually do, but the
3130 * spec doesn't require us to catch every case where the calls
3131 * don't match (that would require caching the call as well as
3132 * the reply), so we don't bother.
3138 nfsd4_sequence(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3139 union nfsd4_op_u
*u
)
3141 struct nfsd4_sequence
*seq
= &u
->sequence
;
3142 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
3143 struct xdr_stream
*xdr
= &resp
->xdr
;
3144 struct nfsd4_session
*session
;
3145 struct nfs4_client
*clp
;
3146 struct nfsd4_slot
*slot
;
3147 struct nfsd4_conn
*conn
;
3150 struct net
*net
= SVC_NET(rqstp
);
3151 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
3153 if (resp
->opcnt
!= 1)
3154 return nfserr_sequence_pos
;
3157 * Will be either used or freed by nfsd4_sequence_check_conn
3160 conn
= alloc_conn(rqstp
, NFS4_CDFC4_FORE
);
3162 return nfserr_jukebox
;
3164 spin_lock(&nn
->client_lock
);
3165 session
= find_in_sessionid_hashtbl(&seq
->sessionid
, net
, &status
);
3167 goto out_no_session
;
3168 clp
= session
->se_client
;
3170 status
= nfserr_too_many_ops
;
3171 if (nfsd4_session_too_many_ops(rqstp
, session
))
3172 goto out_put_session
;
3174 status
= nfserr_req_too_big
;
3175 if (nfsd4_request_too_big(rqstp
, session
))
3176 goto out_put_session
;
3178 status
= nfserr_badslot
;
3179 if (seq
->slotid
>= session
->se_fchannel
.maxreqs
)
3180 goto out_put_session
;
3182 slot
= session
->se_slots
[seq
->slotid
];
3183 dprintk("%s: slotid %d\n", __func__
, seq
->slotid
);
3185 /* We do not negotiate the number of slots yet, so set the
3186 * maxslots to the session maxreqs which is used to encode
3187 * sr_highest_slotid and the sr_target_slot id to maxslots */
3188 seq
->maxslots
= session
->se_fchannel
.maxreqs
;
3190 status
= check_slot_seqid(seq
->seqid
, slot
->sl_seqid
,
3191 slot
->sl_flags
& NFSD4_SLOT_INUSE
);
3192 if (status
== nfserr_replay_cache
) {
3193 status
= nfserr_seq_misordered
;
3194 if (!(slot
->sl_flags
& NFSD4_SLOT_INITIALIZED
))
3195 goto out_put_session
;
3196 status
= nfserr_seq_false_retry
;
3197 if (!replay_matches_cache(rqstp
, seq
, slot
))
3198 goto out_put_session
;
3199 cstate
->slot
= slot
;
3200 cstate
->session
= session
;
3202 /* Return the cached reply status and set cstate->status
3203 * for nfsd4_proc_compound processing */
3204 status
= nfsd4_replay_cache_entry(resp
, seq
);
3205 cstate
->status
= nfserr_replay_cache
;
3209 goto out_put_session
;
3211 status
= nfsd4_sequence_check_conn(conn
, session
);
3214 goto out_put_session
;
3216 buflen
= (seq
->cachethis
) ?
3217 session
->se_fchannel
.maxresp_cached
:
3218 session
->se_fchannel
.maxresp_sz
;
3219 status
= (seq
->cachethis
) ? nfserr_rep_too_big_to_cache
:
3221 if (xdr_restrict_buflen(xdr
, buflen
- rqstp
->rq_auth_slack
))
3222 goto out_put_session
;
3223 svc_reserve(rqstp
, buflen
);
3226 /* Success! bump slot seqid */
3227 slot
->sl_seqid
= seq
->seqid
;
3228 slot
->sl_flags
|= NFSD4_SLOT_INUSE
;
3230 slot
->sl_flags
|= NFSD4_SLOT_CACHETHIS
;
3232 slot
->sl_flags
&= ~NFSD4_SLOT_CACHETHIS
;
3234 cstate
->slot
= slot
;
3235 cstate
->session
= session
;
3239 switch (clp
->cl_cb_state
) {
3241 seq
->status_flags
= SEQ4_STATUS_CB_PATH_DOWN
;
3243 case NFSD4_CB_FAULT
:
3244 seq
->status_flags
= SEQ4_STATUS_BACKCHANNEL_FAULT
;
3247 seq
->status_flags
= 0;
3249 if (!list_empty(&clp
->cl_revoked
))
3250 seq
->status_flags
|= SEQ4_STATUS_RECALLABLE_STATE_REVOKED
;
3254 spin_unlock(&nn
->client_lock
);
3257 nfsd4_put_session_locked(session
);
3258 goto out_no_session
;
3262 nfsd4_sequence_done(struct nfsd4_compoundres
*resp
)
3264 struct nfsd4_compound_state
*cs
= &resp
->cstate
;
3266 if (nfsd4_has_session(cs
)) {
3267 if (cs
->status
!= nfserr_replay_cache
) {
3268 nfsd4_store_cache_entry(resp
);
3269 cs
->slot
->sl_flags
&= ~NFSD4_SLOT_INUSE
;
3271 /* Drop session reference that was taken in nfsd4_sequence() */
3272 nfsd4_put_session(cs
->session
);
3274 put_client_renew(cs
->clp
);
3278 nfsd4_destroy_clientid(struct svc_rqst
*rqstp
,
3279 struct nfsd4_compound_state
*cstate
,
3280 union nfsd4_op_u
*u
)
3282 struct nfsd4_destroy_clientid
*dc
= &u
->destroy_clientid
;
3283 struct nfs4_client
*conf
, *unconf
;
3284 struct nfs4_client
*clp
= NULL
;
3286 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3288 spin_lock(&nn
->client_lock
);
3289 unconf
= find_unconfirmed_client(&dc
->clientid
, true, nn
);
3290 conf
= find_confirmed_client(&dc
->clientid
, true, nn
);
3291 WARN_ON_ONCE(conf
&& unconf
);
3294 if (client_has_state(conf
)) {
3295 status
= nfserr_clientid_busy
;
3298 status
= mark_client_expired_locked(conf
);
3305 status
= nfserr_stale_clientid
;
3308 if (!nfsd4_mach_creds_match(clp
, rqstp
)) {
3310 status
= nfserr_wrong_cred
;
3313 unhash_client_locked(clp
);
3315 spin_unlock(&nn
->client_lock
);
3322 nfsd4_reclaim_complete(struct svc_rqst
*rqstp
,
3323 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
3325 struct nfsd4_reclaim_complete
*rc
= &u
->reclaim_complete
;
3328 if (rc
->rca_one_fs
) {
3329 if (!cstate
->current_fh
.fh_dentry
)
3330 return nfserr_nofilehandle
;
3332 * We don't take advantage of the rca_one_fs case.
3333 * That's OK, it's optional, we can safely ignore it.
3338 status
= nfserr_complete_already
;
3339 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
,
3340 &cstate
->session
->se_client
->cl_flags
))
3343 status
= nfserr_stale_clientid
;
3344 if (is_client_expired(cstate
->session
->se_client
))
3346 * The following error isn't really legal.
3347 * But we only get here if the client just explicitly
3348 * destroyed the client. Surely it no longer cares what
3349 * error it gets back on an operation for the dead
3355 nfsd4_client_record_create(cstate
->session
->se_client
);
3361 nfsd4_setclientid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3362 union nfsd4_op_u
*u
)
3364 struct nfsd4_setclientid
*setclid
= &u
->setclientid
;
3365 struct xdr_netobj clname
= setclid
->se_name
;
3366 nfs4_verifier clverifier
= setclid
->se_verf
;
3367 struct nfs4_client
*conf
, *new;
3368 struct nfs4_client
*unconf
= NULL
;
3370 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3372 new = create_client(clname
, rqstp
, &clverifier
);
3374 return nfserr_jukebox
;
3375 /* Cases below refer to rfc 3530 section 14.2.33: */
3376 spin_lock(&nn
->client_lock
);
3377 conf
= find_confirmed_client_by_name(&clname
, nn
);
3378 if (conf
&& client_has_state(conf
)) {
3380 status
= nfserr_clid_inuse
;
3381 if (clp_used_exchangeid(conf
))
3383 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
)) {
3384 char addr_str
[INET6_ADDRSTRLEN
];
3385 rpc_ntop((struct sockaddr
*) &conf
->cl_addr
, addr_str
,
3387 dprintk("NFSD: setclientid: string in use by client "
3388 "at %s\n", addr_str
);
3392 unconf
= find_unconfirmed_client_by_name(&clname
, nn
);
3394 unhash_client_locked(unconf
);
3395 if (conf
&& same_verf(&conf
->cl_verifier
, &clverifier
)) {
3396 /* case 1: probable callback update */
3397 copy_clid(new, conf
);
3398 gen_confirm(new, nn
);
3399 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3401 new->cl_minorversion
= 0;
3402 gen_callback(new, setclid
, rqstp
);
3403 add_to_unconfirmed(new);
3404 setclid
->se_clientid
.cl_boot
= new->cl_clientid
.cl_boot
;
3405 setclid
->se_clientid
.cl_id
= new->cl_clientid
.cl_id
;
3406 memcpy(setclid
->se_confirm
.data
, new->cl_confirm
.data
, sizeof(setclid
->se_confirm
.data
));
3410 spin_unlock(&nn
->client_lock
);
3414 expire_client(unconf
);
3420 nfsd4_setclientid_confirm(struct svc_rqst
*rqstp
,
3421 struct nfsd4_compound_state
*cstate
,
3422 union nfsd4_op_u
*u
)
3424 struct nfsd4_setclientid_confirm
*setclientid_confirm
=
3425 &u
->setclientid_confirm
;
3426 struct nfs4_client
*conf
, *unconf
;
3427 struct nfs4_client
*old
= NULL
;
3428 nfs4_verifier confirm
= setclientid_confirm
->sc_confirm
;
3429 clientid_t
* clid
= &setclientid_confirm
->sc_clientid
;
3431 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3433 if (STALE_CLIENTID(clid
, nn
))
3434 return nfserr_stale_clientid
;
3436 spin_lock(&nn
->client_lock
);
3437 conf
= find_confirmed_client(clid
, false, nn
);
3438 unconf
= find_unconfirmed_client(clid
, false, nn
);
3440 * We try hard to give out unique clientid's, so if we get an
3441 * attempt to confirm the same clientid with a different cred,
3442 * the client may be buggy; this should never happen.
3444 * Nevertheless, RFC 7530 recommends INUSE for this case:
3446 status
= nfserr_clid_inuse
;
3447 if (unconf
&& !same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
))
3449 if (conf
&& !same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
))
3451 /* cases below refer to rfc 3530 section 14.2.34: */
3452 if (!unconf
|| !same_verf(&confirm
, &unconf
->cl_confirm
)) {
3453 if (conf
&& same_verf(&confirm
, &conf
->cl_confirm
)) {
3454 /* case 2: probable retransmit */
3456 } else /* case 4: client hasn't noticed we rebooted yet? */
3457 status
= nfserr_stale_clientid
;
3461 if (conf
) { /* case 1: callback update */
3463 unhash_client_locked(old
);
3464 nfsd4_change_callback(conf
, &unconf
->cl_cb_conn
);
3465 } else { /* case 3: normal case; new or rebooted client */
3466 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
3468 status
= nfserr_clid_inuse
;
3469 if (client_has_state(old
)
3470 && !same_creds(&unconf
->cl_cred
,
3473 status
= mark_client_expired_locked(old
);
3479 move_to_confirmed(unconf
);
3482 get_client_locked(conf
);
3483 spin_unlock(&nn
->client_lock
);
3484 nfsd4_probe_callback(conf
);
3485 spin_lock(&nn
->client_lock
);
3486 put_client_renew_locked(conf
);
3488 spin_unlock(&nn
->client_lock
);
3494 static struct nfs4_file
*nfsd4_alloc_file(void)
3496 return kmem_cache_alloc(file_slab
, GFP_KERNEL
);
3499 /* OPEN Share state helper functions */
3500 static void nfsd4_init_file(struct knfsd_fh
*fh
, unsigned int hashval
,
3501 struct nfs4_file
*fp
)
3503 lockdep_assert_held(&state_lock
);
3505 refcount_set(&fp
->fi_ref
, 1);
3506 spin_lock_init(&fp
->fi_lock
);
3507 INIT_LIST_HEAD(&fp
->fi_stateids
);
3508 INIT_LIST_HEAD(&fp
->fi_delegations
);
3509 INIT_LIST_HEAD(&fp
->fi_clnt_odstate
);
3510 fh_copy_shallow(&fp
->fi_fhandle
, fh
);
3511 fp
->fi_deleg_file
= NULL
;
3512 fp
->fi_had_conflict
= false;
3513 fp
->fi_share_deny
= 0;
3514 memset(fp
->fi_fds
, 0, sizeof(fp
->fi_fds
));
3515 memset(fp
->fi_access
, 0, sizeof(fp
->fi_access
));
3516 #ifdef CONFIG_NFSD_PNFS
3517 INIT_LIST_HEAD(&fp
->fi_lo_states
);
3518 atomic_set(&fp
->fi_lo_recalls
, 0);
3520 hlist_add_head_rcu(&fp
->fi_hash
, &file_hashtbl
[hashval
]);
3524 nfsd4_free_slabs(void)
3526 kmem_cache_destroy(client_slab
);
3527 kmem_cache_destroy(openowner_slab
);
3528 kmem_cache_destroy(lockowner_slab
);
3529 kmem_cache_destroy(file_slab
);
3530 kmem_cache_destroy(stateid_slab
);
3531 kmem_cache_destroy(deleg_slab
);
3532 kmem_cache_destroy(odstate_slab
);
3536 nfsd4_init_slabs(void)
3538 client_slab
= kmem_cache_create("nfsd4_clients",
3539 sizeof(struct nfs4_client
), 0, 0, NULL
);
3540 if (client_slab
== NULL
)
3542 openowner_slab
= kmem_cache_create("nfsd4_openowners",
3543 sizeof(struct nfs4_openowner
), 0, 0, NULL
);
3544 if (openowner_slab
== NULL
)
3545 goto out_free_client_slab
;
3546 lockowner_slab
= kmem_cache_create("nfsd4_lockowners",
3547 sizeof(struct nfs4_lockowner
), 0, 0, NULL
);
3548 if (lockowner_slab
== NULL
)
3549 goto out_free_openowner_slab
;
3550 file_slab
= kmem_cache_create("nfsd4_files",
3551 sizeof(struct nfs4_file
), 0, 0, NULL
);
3552 if (file_slab
== NULL
)
3553 goto out_free_lockowner_slab
;
3554 stateid_slab
= kmem_cache_create("nfsd4_stateids",
3555 sizeof(struct nfs4_ol_stateid
), 0, 0, NULL
);
3556 if (stateid_slab
== NULL
)
3557 goto out_free_file_slab
;
3558 deleg_slab
= kmem_cache_create("nfsd4_delegations",
3559 sizeof(struct nfs4_delegation
), 0, 0, NULL
);
3560 if (deleg_slab
== NULL
)
3561 goto out_free_stateid_slab
;
3562 odstate_slab
= kmem_cache_create("nfsd4_odstate",
3563 sizeof(struct nfs4_clnt_odstate
), 0, 0, NULL
);
3564 if (odstate_slab
== NULL
)
3565 goto out_free_deleg_slab
;
3568 out_free_deleg_slab
:
3569 kmem_cache_destroy(deleg_slab
);
3570 out_free_stateid_slab
:
3571 kmem_cache_destroy(stateid_slab
);
3573 kmem_cache_destroy(file_slab
);
3574 out_free_lockowner_slab
:
3575 kmem_cache_destroy(lockowner_slab
);
3576 out_free_openowner_slab
:
3577 kmem_cache_destroy(openowner_slab
);
3578 out_free_client_slab
:
3579 kmem_cache_destroy(client_slab
);
3581 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3585 static void init_nfs4_replay(struct nfs4_replay
*rp
)
3587 rp
->rp_status
= nfserr_serverfault
;
3589 rp
->rp_buf
= rp
->rp_ibuf
;
3590 mutex_init(&rp
->rp_mutex
);
3593 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state
*cstate
,
3594 struct nfs4_stateowner
*so
)
3596 if (!nfsd4_has_session(cstate
)) {
3597 mutex_lock(&so
->so_replay
.rp_mutex
);
3598 cstate
->replay_owner
= nfs4_get_stateowner(so
);
3602 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state
*cstate
)
3604 struct nfs4_stateowner
*so
= cstate
->replay_owner
;
3607 cstate
->replay_owner
= NULL
;
3608 mutex_unlock(&so
->so_replay
.rp_mutex
);
3609 nfs4_put_stateowner(so
);
3613 static inline void *alloc_stateowner(struct kmem_cache
*slab
, struct xdr_netobj
*owner
, struct nfs4_client
*clp
)
3615 struct nfs4_stateowner
*sop
;
3617 sop
= kmem_cache_alloc(slab
, GFP_KERNEL
);
3621 sop
->so_owner
.data
= kmemdup(owner
->data
, owner
->len
, GFP_KERNEL
);
3622 if (!sop
->so_owner
.data
) {
3623 kmem_cache_free(slab
, sop
);
3626 sop
->so_owner
.len
= owner
->len
;
3628 INIT_LIST_HEAD(&sop
->so_stateids
);
3629 sop
->so_client
= clp
;
3630 init_nfs4_replay(&sop
->so_replay
);
3631 atomic_set(&sop
->so_count
, 1);
3635 static void hash_openowner(struct nfs4_openowner
*oo
, struct nfs4_client
*clp
, unsigned int strhashval
)
3637 lockdep_assert_held(&clp
->cl_lock
);
3639 list_add(&oo
->oo_owner
.so_strhash
,
3640 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
3641 list_add(&oo
->oo_perclient
, &clp
->cl_openowners
);
3644 static void nfs4_unhash_openowner(struct nfs4_stateowner
*so
)
3646 unhash_openowner_locked(openowner(so
));
3649 static void nfs4_free_openowner(struct nfs4_stateowner
*so
)
3651 struct nfs4_openowner
*oo
= openowner(so
);
3653 kmem_cache_free(openowner_slab
, oo
);
3656 static const struct nfs4_stateowner_operations openowner_ops
= {
3657 .so_unhash
= nfs4_unhash_openowner
,
3658 .so_free
= nfs4_free_openowner
,
3661 static struct nfs4_ol_stateid
*
3662 nfsd4_find_existing_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3664 struct nfs4_ol_stateid
*local
, *ret
= NULL
;
3665 struct nfs4_openowner
*oo
= open
->op_openowner
;
3667 lockdep_assert_held(&fp
->fi_lock
);
3669 list_for_each_entry(local
, &fp
->fi_stateids
, st_perfile
) {
3670 /* ignore lock owners */
3671 if (local
->st_stateowner
->so_is_open_owner
== 0)
3673 if (local
->st_stateowner
!= &oo
->oo_owner
)
3675 if (local
->st_stid
.sc_type
== NFS4_OPEN_STID
) {
3677 refcount_inc(&ret
->st_stid
.sc_count
);
3685 nfsd4_verify_open_stid(struct nfs4_stid
*s
)
3687 __be32 ret
= nfs_ok
;
3689 switch (s
->sc_type
) {
3693 case NFS4_CLOSED_STID
:
3694 case NFS4_CLOSED_DELEG_STID
:
3695 ret
= nfserr_bad_stateid
;
3697 case NFS4_REVOKED_DELEG_STID
:
3698 ret
= nfserr_deleg_revoked
;
3703 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3705 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid
*stp
)
3709 mutex_lock_nested(&stp
->st_mutex
, LOCK_STATEID_MUTEX
);
3710 ret
= nfsd4_verify_open_stid(&stp
->st_stid
);
3712 mutex_unlock(&stp
->st_mutex
);
3716 static struct nfs4_ol_stateid
*
3717 nfsd4_find_and_lock_existing_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3719 struct nfs4_ol_stateid
*stp
;
3721 spin_lock(&fp
->fi_lock
);
3722 stp
= nfsd4_find_existing_open(fp
, open
);
3723 spin_unlock(&fp
->fi_lock
);
3724 if (!stp
|| nfsd4_lock_ol_stateid(stp
) == nfs_ok
)
3726 nfs4_put_stid(&stp
->st_stid
);
3731 static struct nfs4_openowner
*
3732 alloc_init_open_stateowner(unsigned int strhashval
, struct nfsd4_open
*open
,
3733 struct nfsd4_compound_state
*cstate
)
3735 struct nfs4_client
*clp
= cstate
->clp
;
3736 struct nfs4_openowner
*oo
, *ret
;
3738 oo
= alloc_stateowner(openowner_slab
, &open
->op_owner
, clp
);
3741 oo
->oo_owner
.so_ops
= &openowner_ops
;
3742 oo
->oo_owner
.so_is_open_owner
= 1;
3743 oo
->oo_owner
.so_seqid
= open
->op_seqid
;
3745 if (nfsd4_has_session(cstate
))
3746 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
3748 oo
->oo_last_closed_stid
= NULL
;
3749 INIT_LIST_HEAD(&oo
->oo_close_lru
);
3750 spin_lock(&clp
->cl_lock
);
3751 ret
= find_openstateowner_str_locked(strhashval
, open
, clp
);
3753 hash_openowner(oo
, clp
, strhashval
);
3756 nfs4_free_stateowner(&oo
->oo_owner
);
3758 spin_unlock(&clp
->cl_lock
);
3762 static struct nfs4_ol_stateid
*
3763 init_open_stateid(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3766 struct nfs4_openowner
*oo
= open
->op_openowner
;
3767 struct nfs4_ol_stateid
*retstp
= NULL
;
3768 struct nfs4_ol_stateid
*stp
;
3771 /* We are moving these outside of the spinlocks to avoid the warnings */
3772 mutex_init(&stp
->st_mutex
);
3773 mutex_lock_nested(&stp
->st_mutex
, OPEN_STATEID_MUTEX
);
3776 spin_lock(&oo
->oo_owner
.so_client
->cl_lock
);
3777 spin_lock(&fp
->fi_lock
);
3779 retstp
= nfsd4_find_existing_open(fp
, open
);
3783 open
->op_stp
= NULL
;
3784 refcount_inc(&stp
->st_stid
.sc_count
);
3785 stp
->st_stid
.sc_type
= NFS4_OPEN_STID
;
3786 INIT_LIST_HEAD(&stp
->st_locks
);
3787 stp
->st_stateowner
= nfs4_get_stateowner(&oo
->oo_owner
);
3789 stp
->st_stid
.sc_file
= fp
;
3790 stp
->st_access_bmap
= 0;
3791 stp
->st_deny_bmap
= 0;
3792 stp
->st_openstp
= NULL
;
3793 list_add(&stp
->st_perstateowner
, &oo
->oo_owner
.so_stateids
);
3794 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
3797 spin_unlock(&fp
->fi_lock
);
3798 spin_unlock(&oo
->oo_owner
.so_client
->cl_lock
);
3800 /* Handle races with CLOSE */
3801 if (nfsd4_lock_ol_stateid(retstp
) != nfs_ok
) {
3802 nfs4_put_stid(&retstp
->st_stid
);
3805 /* To keep mutex tracking happy */
3806 mutex_unlock(&stp
->st_mutex
);
3813 * In the 4.0 case we need to keep the owners around a little while to handle
3814 * CLOSE replay. We still do need to release any file access that is held by
3815 * them before returning however.
3818 move_to_close_lru(struct nfs4_ol_stateid
*s
, struct net
*net
)
3820 struct nfs4_ol_stateid
*last
;
3821 struct nfs4_openowner
*oo
= openowner(s
->st_stateowner
);
3822 struct nfsd_net
*nn
= net_generic(s
->st_stid
.sc_client
->net
,
3825 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo
);
3828 * We know that we hold one reference via nfsd4_close, and another
3829 * "persistent" reference for the client. If the refcount is higher
3830 * than 2, then there are still calls in progress that are using this
3831 * stateid. We can't put the sc_file reference until they are finished.
3832 * Wait for the refcount to drop to 2. Since it has been unhashed,
3833 * there should be no danger of the refcount going back up again at
3836 wait_event(close_wq
, refcount_read(&s
->st_stid
.sc_count
) == 2);
3838 release_all_access(s
);
3839 if (s
->st_stid
.sc_file
) {
3840 put_nfs4_file(s
->st_stid
.sc_file
);
3841 s
->st_stid
.sc_file
= NULL
;
3844 spin_lock(&nn
->client_lock
);
3845 last
= oo
->oo_last_closed_stid
;
3846 oo
->oo_last_closed_stid
= s
;
3847 list_move_tail(&oo
->oo_close_lru
, &nn
->close_lru
);
3848 oo
->oo_time
= get_seconds();
3849 spin_unlock(&nn
->client_lock
);
3851 nfs4_put_stid(&last
->st_stid
);
3854 /* search file_hashtbl[] for file */
3855 static struct nfs4_file
*
3856 find_file_locked(struct knfsd_fh
*fh
, unsigned int hashval
)
3858 struct nfs4_file
*fp
;
3860 hlist_for_each_entry_rcu(fp
, &file_hashtbl
[hashval
], fi_hash
) {
3861 if (fh_match(&fp
->fi_fhandle
, fh
)) {
3862 if (refcount_inc_not_zero(&fp
->fi_ref
))
3870 find_file(struct knfsd_fh
*fh
)
3872 struct nfs4_file
*fp
;
3873 unsigned int hashval
= file_hashval(fh
);
3876 fp
= find_file_locked(fh
, hashval
);
3881 static struct nfs4_file
*
3882 find_or_add_file(struct nfs4_file
*new, struct knfsd_fh
*fh
)
3884 struct nfs4_file
*fp
;
3885 unsigned int hashval
= file_hashval(fh
);
3888 fp
= find_file_locked(fh
, hashval
);
3893 spin_lock(&state_lock
);
3894 fp
= find_file_locked(fh
, hashval
);
3895 if (likely(fp
== NULL
)) {
3896 nfsd4_init_file(fh
, hashval
, new);
3899 spin_unlock(&state_lock
);
3905 * Called to check deny when READ with all zero stateid or
3906 * WRITE with all zero or all one stateid
3909 nfs4_share_conflict(struct svc_fh
*current_fh
, unsigned int deny_type
)
3911 struct nfs4_file
*fp
;
3912 __be32 ret
= nfs_ok
;
3914 fp
= find_file(¤t_fh
->fh_handle
);
3917 /* Check for conflicting share reservations */
3918 spin_lock(&fp
->fi_lock
);
3919 if (fp
->fi_share_deny
& deny_type
)
3920 ret
= nfserr_locked
;
3921 spin_unlock(&fp
->fi_lock
);
3926 static void nfsd4_cb_recall_prepare(struct nfsd4_callback
*cb
)
3928 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3929 struct nfsd_net
*nn
= net_generic(dp
->dl_stid
.sc_client
->net
,
3932 block_delegations(&dp
->dl_stid
.sc_file
->fi_fhandle
);
3935 * We can't do this in nfsd_break_deleg_cb because it is
3936 * already holding inode->i_lock.
3938 * If the dl_time != 0, then we know that it has already been
3939 * queued for a lease break. Don't queue it again.
3941 spin_lock(&state_lock
);
3942 if (dp
->dl_time
== 0) {
3943 dp
->dl_time
= get_seconds();
3944 list_add_tail(&dp
->dl_recall_lru
, &nn
->del_recall_lru
);
3946 spin_unlock(&state_lock
);
3949 static int nfsd4_cb_recall_done(struct nfsd4_callback
*cb
,
3950 struct rpc_task
*task
)
3952 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3954 if (dp
->dl_stid
.sc_type
== NFS4_CLOSED_DELEG_STID
)
3957 switch (task
->tk_status
) {
3961 case -NFS4ERR_BAD_STATEID
:
3963 * Race: client probably got cb_recall before open reply
3964 * granting delegation.
3966 if (dp
->dl_retries
--) {
3967 rpc_delay(task
, 2 * HZ
);
3976 static void nfsd4_cb_recall_release(struct nfsd4_callback
*cb
)
3978 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3980 nfs4_put_stid(&dp
->dl_stid
);
3983 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops
= {
3984 .prepare
= nfsd4_cb_recall_prepare
,
3985 .done
= nfsd4_cb_recall_done
,
3986 .release
= nfsd4_cb_recall_release
,
3989 static void nfsd_break_one_deleg(struct nfs4_delegation
*dp
)
3992 * We're assuming the state code never drops its reference
3993 * without first removing the lease. Since we're in this lease
3994 * callback (and since the lease code is serialized by the
3995 * i_lock) we know the server hasn't removed the lease yet, and
3996 * we know it's safe to take a reference.
3998 refcount_inc(&dp
->dl_stid
.sc_count
);
3999 nfsd4_run_cb(&dp
->dl_recall
);
4002 /* Called from break_lease() with i_lock held. */
4004 nfsd_break_deleg_cb(struct file_lock
*fl
)
4007 struct nfs4_delegation
*dp
= (struct nfs4_delegation
*)fl
->fl_owner
;
4008 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
4011 * We don't want the locks code to timeout the lease for us;
4012 * we'll remove it ourself if a delegation isn't returned
4015 fl
->fl_break_time
= 0;
4017 spin_lock(&fp
->fi_lock
);
4018 fp
->fi_had_conflict
= true;
4019 nfsd_break_one_deleg(dp
);
4020 spin_unlock(&fp
->fi_lock
);
4025 nfsd_change_deleg_cb(struct file_lock
*onlist
, int arg
,
4026 struct list_head
*dispose
)
4029 return lease_modify(onlist
, arg
, dispose
);
4034 static const struct lock_manager_operations nfsd_lease_mng_ops
= {
4035 .lm_break
= nfsd_break_deleg_cb
,
4036 .lm_change
= nfsd_change_deleg_cb
,
4039 static __be32
nfsd4_check_seqid(struct nfsd4_compound_state
*cstate
, struct nfs4_stateowner
*so
, u32 seqid
)
4041 if (nfsd4_has_session(cstate
))
4043 if (seqid
== so
->so_seqid
- 1)
4044 return nfserr_replay_me
;
4045 if (seqid
== so
->so_seqid
)
4047 return nfserr_bad_seqid
;
4050 static __be32
lookup_clientid(clientid_t
*clid
,
4051 struct nfsd4_compound_state
*cstate
,
4052 struct nfsd_net
*nn
)
4054 struct nfs4_client
*found
;
4057 found
= cstate
->clp
;
4058 if (!same_clid(&found
->cl_clientid
, clid
))
4059 return nfserr_stale_clientid
;
4063 if (STALE_CLIENTID(clid
, nn
))
4064 return nfserr_stale_clientid
;
4067 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4068 * cached already then we know this is for is for v4.0 and "sessions"
4071 WARN_ON_ONCE(cstate
->session
);
4072 spin_lock(&nn
->client_lock
);
4073 found
= find_confirmed_client(clid
, false, nn
);
4075 spin_unlock(&nn
->client_lock
);
4076 return nfserr_expired
;
4078 atomic_inc(&found
->cl_refcount
);
4079 spin_unlock(&nn
->client_lock
);
4081 /* Cache the nfs4_client in cstate! */
4082 cstate
->clp
= found
;
4087 nfsd4_process_open1(struct nfsd4_compound_state
*cstate
,
4088 struct nfsd4_open
*open
, struct nfsd_net
*nn
)
4090 clientid_t
*clientid
= &open
->op_clientid
;
4091 struct nfs4_client
*clp
= NULL
;
4092 unsigned int strhashval
;
4093 struct nfs4_openowner
*oo
= NULL
;
4096 if (STALE_CLIENTID(&open
->op_clientid
, nn
))
4097 return nfserr_stale_clientid
;
4099 * In case we need it later, after we've already created the
4100 * file and don't want to risk a further failure:
4102 open
->op_file
= nfsd4_alloc_file();
4103 if (open
->op_file
== NULL
)
4104 return nfserr_jukebox
;
4106 status
= lookup_clientid(clientid
, cstate
, nn
);
4111 strhashval
= ownerstr_hashval(&open
->op_owner
);
4112 oo
= find_openstateowner_str(strhashval
, open
, clp
);
4113 open
->op_openowner
= oo
;
4117 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
4118 /* Replace unconfirmed owners without checking for replay. */
4119 release_openowner(oo
);
4120 open
->op_openowner
= NULL
;
4123 status
= nfsd4_check_seqid(cstate
, &oo
->oo_owner
, open
->op_seqid
);
4128 oo
= alloc_init_open_stateowner(strhashval
, open
, cstate
);
4130 return nfserr_jukebox
;
4131 open
->op_openowner
= oo
;
4133 open
->op_stp
= nfs4_alloc_open_stateid(clp
);
4135 return nfserr_jukebox
;
4137 if (nfsd4_has_session(cstate
) &&
4138 (cstate
->current_fh
.fh_export
->ex_flags
& NFSEXP_PNFS
)) {
4139 open
->op_odstate
= alloc_clnt_odstate(clp
);
4140 if (!open
->op_odstate
)
4141 return nfserr_jukebox
;
4147 static inline __be32
4148 nfs4_check_delegmode(struct nfs4_delegation
*dp
, int flags
)
4150 if ((flags
& WR_STATE
) && (dp
->dl_type
== NFS4_OPEN_DELEGATE_READ
))
4151 return nfserr_openmode
;
4156 static int share_access_to_flags(u32 share_access
)
4158 return share_access
== NFS4_SHARE_ACCESS_READ
? RD_STATE
: WR_STATE
;
4161 static struct nfs4_delegation
*find_deleg_stateid(struct nfs4_client
*cl
, stateid_t
*s
)
4163 struct nfs4_stid
*ret
;
4165 ret
= find_stateid_by_type(cl
, s
,
4166 NFS4_DELEG_STID
|NFS4_REVOKED_DELEG_STID
);
4169 return delegstateid(ret
);
4172 static bool nfsd4_is_deleg_cur(struct nfsd4_open
*open
)
4174 return open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEGATE_CUR
||
4175 open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEG_CUR_FH
;
4179 nfs4_check_deleg(struct nfs4_client
*cl
, struct nfsd4_open
*open
,
4180 struct nfs4_delegation
**dp
)
4183 __be32 status
= nfserr_bad_stateid
;
4184 struct nfs4_delegation
*deleg
;
4186 deleg
= find_deleg_stateid(cl
, &open
->op_delegate_stateid
);
4189 if (deleg
->dl_stid
.sc_type
== NFS4_REVOKED_DELEG_STID
) {
4190 nfs4_put_stid(&deleg
->dl_stid
);
4191 if (cl
->cl_minorversion
)
4192 status
= nfserr_deleg_revoked
;
4195 flags
= share_access_to_flags(open
->op_share_access
);
4196 status
= nfs4_check_delegmode(deleg
, flags
);
4198 nfs4_put_stid(&deleg
->dl_stid
);
4203 if (!nfsd4_is_deleg_cur(open
))
4207 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
4211 static inline int nfs4_access_to_access(u32 nfs4_access
)
4215 if (nfs4_access
& NFS4_SHARE_ACCESS_READ
)
4216 flags
|= NFSD_MAY_READ
;
4217 if (nfs4_access
& NFS4_SHARE_ACCESS_WRITE
)
4218 flags
|= NFSD_MAY_WRITE
;
4222 static inline __be32
4223 nfsd4_truncate(struct svc_rqst
*rqstp
, struct svc_fh
*fh
,
4224 struct nfsd4_open
*open
)
4226 struct iattr iattr
= {
4227 .ia_valid
= ATTR_SIZE
,
4230 if (!open
->op_truncate
)
4232 if (!(open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
))
4233 return nfserr_inval
;
4234 return nfsd_setattr(rqstp
, fh
, &iattr
, 0, (time_t)0);
4237 static __be32
nfs4_get_vfs_file(struct svc_rqst
*rqstp
, struct nfs4_file
*fp
,
4238 struct svc_fh
*cur_fh
, struct nfs4_ol_stateid
*stp
,
4239 struct nfsd4_open
*open
)
4241 struct file
*filp
= NULL
;
4243 int oflag
= nfs4_access_to_omode(open
->op_share_access
);
4244 int access
= nfs4_access_to_access(open
->op_share_access
);
4245 unsigned char old_access_bmap
, old_deny_bmap
;
4247 spin_lock(&fp
->fi_lock
);
4250 * Are we trying to set a deny mode that would conflict with
4253 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
4254 if (status
!= nfs_ok
) {
4255 spin_unlock(&fp
->fi_lock
);
4259 /* set access to the file */
4260 status
= nfs4_file_get_access(fp
, open
->op_share_access
);
4261 if (status
!= nfs_ok
) {
4262 spin_unlock(&fp
->fi_lock
);
4266 /* Set access bits in stateid */
4267 old_access_bmap
= stp
->st_access_bmap
;
4268 set_access(open
->op_share_access
, stp
);
4270 /* Set new deny mask */
4271 old_deny_bmap
= stp
->st_deny_bmap
;
4272 set_deny(open
->op_share_deny
, stp
);
4273 fp
->fi_share_deny
|= (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
4275 if (!fp
->fi_fds
[oflag
]) {
4276 spin_unlock(&fp
->fi_lock
);
4277 status
= nfsd_open(rqstp
, cur_fh
, S_IFREG
, access
, &filp
);
4279 goto out_put_access
;
4280 spin_lock(&fp
->fi_lock
);
4281 if (!fp
->fi_fds
[oflag
]) {
4282 fp
->fi_fds
[oflag
] = filp
;
4286 spin_unlock(&fp
->fi_lock
);
4290 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4292 goto out_put_access
;
4296 stp
->st_access_bmap
= old_access_bmap
;
4297 nfs4_file_put_access(fp
, open
->op_share_access
);
4298 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap
), stp
);
4303 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
)
4306 unsigned char old_deny_bmap
= stp
->st_deny_bmap
;
4308 if (!test_access(open
->op_share_access
, stp
))
4309 return nfs4_get_vfs_file(rqstp
, fp
, cur_fh
, stp
, open
);
4311 /* test and set deny mode */
4312 spin_lock(&fp
->fi_lock
);
4313 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
4314 if (status
== nfs_ok
) {
4315 set_deny(open
->op_share_deny
, stp
);
4316 fp
->fi_share_deny
|=
4317 (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
4319 spin_unlock(&fp
->fi_lock
);
4321 if (status
!= nfs_ok
)
4324 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4325 if (status
!= nfs_ok
)
4326 reset_union_bmap_deny(old_deny_bmap
, stp
);
4330 /* Should we give out recallable state?: */
4331 static bool nfsd4_cb_channel_good(struct nfs4_client
*clp
)
4333 if (clp
->cl_cb_state
== NFSD4_CB_UP
)
4336 * In the sessions case, since we don't have to establish a
4337 * separate connection for callbacks, we assume it's OK
4338 * until we hear otherwise:
4340 return clp
->cl_minorversion
&& clp
->cl_cb_state
== NFSD4_CB_UNKNOWN
;
4343 static struct file_lock
*nfs4_alloc_init_lease(struct nfs4_delegation
*dp
,
4346 struct file_lock
*fl
;
4348 fl
= locks_alloc_lock();
4351 fl
->fl_lmops
= &nfsd_lease_mng_ops
;
4352 fl
->fl_flags
= FL_DELEG
;
4353 fl
->fl_type
= flag
== NFS4_OPEN_DELEGATE_READ
? F_RDLCK
: F_WRLCK
;
4354 fl
->fl_end
= OFFSET_MAX
;
4355 fl
->fl_owner
= (fl_owner_t
)dp
;
4356 fl
->fl_pid
= current
->tgid
;
4357 fl
->fl_file
= dp
->dl_stid
.sc_file
->fi_deleg_file
;
4361 static struct nfs4_delegation
*
4362 nfs4_set_delegation(struct nfs4_client
*clp
, struct svc_fh
*fh
,
4363 struct nfs4_file
*fp
, struct nfs4_clnt_odstate
*odstate
)
4366 struct nfs4_delegation
*dp
;
4368 struct file_lock
*fl
;
4371 * The fi_had_conflict and nfs_get_existing_delegation checks
4372 * here are just optimizations; we'll need to recheck them at
4375 if (fp
->fi_had_conflict
)
4376 return ERR_PTR(-EAGAIN
);
4378 filp
= find_readable_file(fp
);
4380 /* We should always have a readable file here */
4382 return ERR_PTR(-EBADF
);
4384 spin_lock(&state_lock
);
4385 spin_lock(&fp
->fi_lock
);
4386 if (nfs4_delegation_exists(clp
, fp
))
4388 else if (!fp
->fi_deleg_file
) {
4389 fp
->fi_deleg_file
= filp
;
4390 /* increment early to prevent fi_deleg_file from being
4392 fp
->fi_delegees
= 1;
4396 spin_unlock(&fp
->fi_lock
);
4397 spin_unlock(&state_lock
);
4401 return ERR_PTR(status
);
4404 dp
= alloc_init_deleg(clp
, fp
, fh
, odstate
);
4408 fl
= nfs4_alloc_init_lease(dp
, NFS4_OPEN_DELEGATE_READ
);
4410 goto out_clnt_odstate
;
4412 status
= vfs_setlease(fp
->fi_deleg_file
, fl
->fl_type
, &fl
, NULL
);
4414 locks_free_lock(fl
);
4416 goto out_clnt_odstate
;
4418 spin_lock(&state_lock
);
4419 spin_lock(&fp
->fi_lock
);
4420 if (fp
->fi_had_conflict
)
4423 status
= hash_delegation_locked(dp
, fp
);
4424 spin_unlock(&fp
->fi_lock
);
4425 spin_unlock(&state_lock
);
4432 vfs_setlease(fp
->fi_deleg_file
, F_UNLCK
, NULL
, (void **)&dp
);
4434 put_clnt_odstate(dp
->dl_clnt_odstate
);
4435 nfs4_put_stid(&dp
->dl_stid
);
4438 return ERR_PTR(status
);
4441 static void nfsd4_open_deleg_none_ext(struct nfsd4_open
*open
, int status
)
4443 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4444 if (status
== -EAGAIN
)
4445 open
->op_why_no_deleg
= WND4_CONTENTION
;
4447 open
->op_why_no_deleg
= WND4_RESOURCE
;
4448 switch (open
->op_deleg_want
) {
4449 case NFS4_SHARE_WANT_READ_DELEG
:
4450 case NFS4_SHARE_WANT_WRITE_DELEG
:
4451 case NFS4_SHARE_WANT_ANY_DELEG
:
4453 case NFS4_SHARE_WANT_CANCEL
:
4454 open
->op_why_no_deleg
= WND4_CANCELLED
;
4456 case NFS4_SHARE_WANT_NO_DELEG
:
4463 * Attempt to hand out a delegation.
4465 * Note we don't support write delegations, and won't until the vfs has
4466 * proper support for them.
4469 nfs4_open_delegation(struct svc_fh
*fh
, struct nfsd4_open
*open
,
4470 struct nfs4_ol_stateid
*stp
)
4472 struct nfs4_delegation
*dp
;
4473 struct nfs4_openowner
*oo
= openowner(stp
->st_stateowner
);
4474 struct nfs4_client
*clp
= stp
->st_stid
.sc_client
;
4478 cb_up
= nfsd4_cb_channel_good(oo
->oo_owner
.so_client
);
4479 open
->op_recall
= 0;
4480 switch (open
->op_claim_type
) {
4481 case NFS4_OPEN_CLAIM_PREVIOUS
:
4483 open
->op_recall
= 1;
4484 if (open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_READ
)
4487 case NFS4_OPEN_CLAIM_NULL
:
4488 case NFS4_OPEN_CLAIM_FH
:
4490 * Let's not give out any delegations till everyone's
4491 * had the chance to reclaim theirs, *and* until
4492 * NLM locks have all been reclaimed:
4494 if (locks_in_grace(clp
->net
))
4496 if (!cb_up
|| !(oo
->oo_flags
& NFS4_OO_CONFIRMED
))
4499 * Also, if the file was opened for write or
4500 * create, there's a good chance the client's
4501 * about to write to it, resulting in an
4502 * immediate recall (since we don't support
4503 * write delegations):
4505 if (open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
)
4507 if (open
->op_create
== NFS4_OPEN_CREATE
)
4513 dp
= nfs4_set_delegation(clp
, fh
, stp
->st_stid
.sc_file
, stp
->st_clnt_odstate
);
4517 memcpy(&open
->op_delegate_stateid
, &dp
->dl_stid
.sc_stateid
, sizeof(dp
->dl_stid
.sc_stateid
));
4519 dprintk("NFSD: delegation stateid=" STATEID_FMT
"\n",
4520 STATEID_VAL(&dp
->dl_stid
.sc_stateid
));
4521 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_READ
;
4522 nfs4_put_stid(&dp
->dl_stid
);
4525 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE
;
4526 if (open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
&&
4527 open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_NONE
) {
4528 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4529 open
->op_recall
= 1;
4532 /* 4.1 client asking for a delegation? */
4533 if (open
->op_deleg_want
)
4534 nfsd4_open_deleg_none_ext(open
, status
);
4538 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open
*open
,
4539 struct nfs4_delegation
*dp
)
4541 if (open
->op_deleg_want
== NFS4_SHARE_WANT_READ_DELEG
&&
4542 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4543 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4544 open
->op_why_no_deleg
= WND4_NOT_SUPP_DOWNGRADE
;
4545 } else if (open
->op_deleg_want
== NFS4_SHARE_WANT_WRITE_DELEG
&&
4546 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4547 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4548 open
->op_why_no_deleg
= WND4_NOT_SUPP_UPGRADE
;
4550 /* Otherwise the client must be confused wanting a delegation
4551 * it already has, therefore we don't return
4552 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4557 nfsd4_process_open2(struct svc_rqst
*rqstp
, struct svc_fh
*current_fh
, struct nfsd4_open
*open
)
4559 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
4560 struct nfs4_client
*cl
= open
->op_openowner
->oo_owner
.so_client
;
4561 struct nfs4_file
*fp
= NULL
;
4562 struct nfs4_ol_stateid
*stp
= NULL
;
4563 struct nfs4_delegation
*dp
= NULL
;
4565 bool new_stp
= false;
4568 * Lookup file; if found, lookup stateid and check open request,
4569 * and check for delegations in the process of being recalled.
4570 * If not found, create the nfs4_file struct
4572 fp
= find_or_add_file(open
->op_file
, ¤t_fh
->fh_handle
);
4573 if (fp
!= open
->op_file
) {
4574 status
= nfs4_check_deleg(cl
, open
, &dp
);
4577 stp
= nfsd4_find_and_lock_existing_open(fp
, open
);
4579 open
->op_file
= NULL
;
4580 status
= nfserr_bad_stateid
;
4581 if (nfsd4_is_deleg_cur(open
))
4586 stp
= init_open_stateid(fp
, open
);
4592 * OPEN the file, or upgrade an existing OPEN.
4593 * If truncate fails, the OPEN fails.
4595 * stp is already locked.
4598 /* Stateid was found, this is an OPEN upgrade */
4599 status
= nfs4_upgrade_open(rqstp
, fp
, current_fh
, stp
, open
);
4601 mutex_unlock(&stp
->st_mutex
);
4605 status
= nfs4_get_vfs_file(rqstp
, fp
, current_fh
, stp
, open
);
4607 stp
->st_stid
.sc_type
= NFS4_CLOSED_STID
;
4608 release_open_stateid(stp
);
4609 mutex_unlock(&stp
->st_mutex
);
4613 stp
->st_clnt_odstate
= find_or_hash_clnt_odstate(fp
,
4615 if (stp
->st_clnt_odstate
== open
->op_odstate
)
4616 open
->op_odstate
= NULL
;
4619 nfs4_inc_and_copy_stateid(&open
->op_stateid
, &stp
->st_stid
);
4620 mutex_unlock(&stp
->st_mutex
);
4622 if (nfsd4_has_session(&resp
->cstate
)) {
4623 if (open
->op_deleg_want
& NFS4_SHARE_WANT_NO_DELEG
) {
4624 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4625 open
->op_why_no_deleg
= WND4_NOT_WANTED
;
4631 * Attempt to hand out a delegation. No error return, because the
4632 * OPEN succeeds even if we fail.
4634 nfs4_open_delegation(current_fh
, open
, stp
);
4638 dprintk("%s: stateid=" STATEID_FMT
"\n", __func__
,
4639 STATEID_VAL(&stp
->st_stid
.sc_stateid
));
4641 /* 4.1 client trying to upgrade/downgrade delegation? */
4642 if (open
->op_delegate_type
== NFS4_OPEN_DELEGATE_NONE
&& dp
&&
4643 open
->op_deleg_want
)
4644 nfsd4_deleg_xgrade_none_ext(open
, dp
);
4648 if (status
== 0 && open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
)
4649 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
4651 * To finish the open response, we just need to set the rflags.
4653 open
->op_rflags
= NFS4_OPEN_RESULT_LOCKTYPE_POSIX
;
4654 if (nfsd4_has_session(&resp
->cstate
))
4655 open
->op_rflags
|= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK
;
4656 else if (!(open
->op_openowner
->oo_flags
& NFS4_OO_CONFIRMED
))
4657 open
->op_rflags
|= NFS4_OPEN_RESULT_CONFIRM
;
4660 nfs4_put_stid(&dp
->dl_stid
);
4662 nfs4_put_stid(&stp
->st_stid
);
4667 void nfsd4_cleanup_open_state(struct nfsd4_compound_state
*cstate
,
4668 struct nfsd4_open
*open
)
4670 if (open
->op_openowner
) {
4671 struct nfs4_stateowner
*so
= &open
->op_openowner
->oo_owner
;
4673 nfsd4_cstate_assign_replay(cstate
, so
);
4674 nfs4_put_stateowner(so
);
4677 kmem_cache_free(file_slab
, open
->op_file
);
4679 nfs4_put_stid(&open
->op_stp
->st_stid
);
4680 if (open
->op_odstate
)
4681 kmem_cache_free(odstate_slab
, open
->op_odstate
);
4685 nfsd4_renew(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
4686 union nfsd4_op_u
*u
)
4688 clientid_t
*clid
= &u
->renew
;
4689 struct nfs4_client
*clp
;
4691 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
4693 dprintk("process_renew(%08x/%08x): starting\n",
4694 clid
->cl_boot
, clid
->cl_id
);
4695 status
= lookup_clientid(clid
, cstate
, nn
);
4699 status
= nfserr_cb_path_down
;
4700 if (!list_empty(&clp
->cl_delegations
)
4701 && clp
->cl_cb_state
!= NFSD4_CB_UP
)
4709 nfsd4_end_grace(struct nfsd_net
*nn
)
4711 /* do nothing if grace period already ended */
4712 if (nn
->grace_ended
)
4715 dprintk("NFSD: end of grace period\n");
4716 nn
->grace_ended
= true;
4718 * If the server goes down again right now, an NFSv4
4719 * client will still be allowed to reclaim after it comes back up,
4720 * even if it hasn't yet had a chance to reclaim state this time.
4723 nfsd4_record_grace_done(nn
);
4725 * At this point, NFSv4 clients can still reclaim. But if the
4726 * server crashes, any that have not yet reclaimed will be out
4727 * of luck on the next boot.
4729 * (NFSv4.1+ clients are considered to have reclaimed once they
4730 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4731 * have reclaimed after their first OPEN.)
4733 locks_end_grace(&nn
->nfsd4_manager
);
4735 * At this point, and once lockd and/or any other containers
4736 * exit their grace period, further reclaims will fail and
4737 * regular locking can resume.
4742 * If we've waited a lease period but there are still clients trying to
4743 * reclaim, wait a little longer to give them a chance to finish.
4745 static bool clients_still_reclaiming(struct nfsd_net
*nn
)
4747 unsigned long now
= get_seconds();
4748 unsigned long double_grace_period_end
= nn
->boot_time
+
4749 2 * nn
->nfsd4_lease
;
4751 if (!nn
->somebody_reclaimed
)
4753 nn
->somebody_reclaimed
= false;
4755 * If we've given them *two* lease times to reclaim, and they're
4756 * still not done, give up:
4758 if (time_after(now
, double_grace_period_end
))
4764 nfs4_laundromat(struct nfsd_net
*nn
)
4766 struct nfs4_client
*clp
;
4767 struct nfs4_openowner
*oo
;
4768 struct nfs4_delegation
*dp
;
4769 struct nfs4_ol_stateid
*stp
;
4770 struct nfsd4_blocked_lock
*nbl
;
4771 struct list_head
*pos
, *next
, reaplist
;
4772 time_t cutoff
= get_seconds() - nn
->nfsd4_lease
;
4773 time_t t
, new_timeo
= nn
->nfsd4_lease
;
4775 dprintk("NFSD: laundromat service - starting\n");
4777 if (clients_still_reclaiming(nn
)) {
4781 nfsd4_end_grace(nn
);
4782 INIT_LIST_HEAD(&reaplist
);
4783 spin_lock(&nn
->client_lock
);
4784 list_for_each_safe(pos
, next
, &nn
->client_lru
) {
4785 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4786 if (time_after((unsigned long)clp
->cl_time
, (unsigned long)cutoff
)) {
4787 t
= clp
->cl_time
- cutoff
;
4788 new_timeo
= min(new_timeo
, t
);
4791 if (mark_client_expired_locked(clp
)) {
4792 dprintk("NFSD: client in use (clientid %08x)\n",
4793 clp
->cl_clientid
.cl_id
);
4796 list_add(&clp
->cl_lru
, &reaplist
);
4798 spin_unlock(&nn
->client_lock
);
4799 list_for_each_safe(pos
, next
, &reaplist
) {
4800 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4801 dprintk("NFSD: purging unused client (clientid %08x)\n",
4802 clp
->cl_clientid
.cl_id
);
4803 list_del_init(&clp
->cl_lru
);
4806 spin_lock(&state_lock
);
4807 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
4808 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
4809 if (time_after((unsigned long)dp
->dl_time
, (unsigned long)cutoff
)) {
4810 t
= dp
->dl_time
- cutoff
;
4811 new_timeo
= min(new_timeo
, t
);
4814 WARN_ON(!unhash_delegation_locked(dp
));
4815 list_add(&dp
->dl_recall_lru
, &reaplist
);
4817 spin_unlock(&state_lock
);
4818 while (!list_empty(&reaplist
)) {
4819 dp
= list_first_entry(&reaplist
, struct nfs4_delegation
,
4821 list_del_init(&dp
->dl_recall_lru
);
4822 revoke_delegation(dp
);
4825 spin_lock(&nn
->client_lock
);
4826 while (!list_empty(&nn
->close_lru
)) {
4827 oo
= list_first_entry(&nn
->close_lru
, struct nfs4_openowner
,
4829 if (time_after((unsigned long)oo
->oo_time
,
4830 (unsigned long)cutoff
)) {
4831 t
= oo
->oo_time
- cutoff
;
4832 new_timeo
= min(new_timeo
, t
);
4835 list_del_init(&oo
->oo_close_lru
);
4836 stp
= oo
->oo_last_closed_stid
;
4837 oo
->oo_last_closed_stid
= NULL
;
4838 spin_unlock(&nn
->client_lock
);
4839 nfs4_put_stid(&stp
->st_stid
);
4840 spin_lock(&nn
->client_lock
);
4842 spin_unlock(&nn
->client_lock
);
4845 * It's possible for a client to try and acquire an already held lock
4846 * that is being held for a long time, and then lose interest in it.
4847 * So, we clean out any un-revisited request after a lease period
4848 * under the assumption that the client is no longer interested.
4850 * RFC5661, sec. 9.6 states that the client must not rely on getting
4851 * notifications and must continue to poll for locks, even when the
4852 * server supports them. Thus this shouldn't lead to clients blocking
4853 * indefinitely once the lock does become free.
4855 BUG_ON(!list_empty(&reaplist
));
4856 spin_lock(&nn
->blocked_locks_lock
);
4857 while (!list_empty(&nn
->blocked_locks_lru
)) {
4858 nbl
= list_first_entry(&nn
->blocked_locks_lru
,
4859 struct nfsd4_blocked_lock
, nbl_lru
);
4860 if (time_after((unsigned long)nbl
->nbl_time
,
4861 (unsigned long)cutoff
)) {
4862 t
= nbl
->nbl_time
- cutoff
;
4863 new_timeo
= min(new_timeo
, t
);
4866 list_move(&nbl
->nbl_lru
, &reaplist
);
4867 list_del_init(&nbl
->nbl_list
);
4869 spin_unlock(&nn
->blocked_locks_lock
);
4871 while (!list_empty(&reaplist
)) {
4872 nbl
= list_first_entry(&reaplist
,
4873 struct nfsd4_blocked_lock
, nbl_lru
);
4874 list_del_init(&nbl
->nbl_lru
);
4875 free_blocked_lock(nbl
);
4878 new_timeo
= max_t(time_t, new_timeo
, NFSD_LAUNDROMAT_MINTIMEOUT
);
4882 static struct workqueue_struct
*laundry_wq
;
4883 static void laundromat_main(struct work_struct
*);
4886 laundromat_main(struct work_struct
*laundry
)
4889 struct delayed_work
*dwork
= to_delayed_work(laundry
);
4890 struct nfsd_net
*nn
= container_of(dwork
, struct nfsd_net
,
4893 t
= nfs4_laundromat(nn
);
4894 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t
);
4895 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, t
*HZ
);
4898 static inline __be32
nfs4_check_fh(struct svc_fh
*fhp
, struct nfs4_stid
*stp
)
4900 if (!fh_match(&fhp
->fh_handle
, &stp
->sc_file
->fi_fhandle
))
4901 return nfserr_bad_stateid
;
4906 access_permit_read(struct nfs4_ol_stateid
*stp
)
4908 return test_access(NFS4_SHARE_ACCESS_READ
, stp
) ||
4909 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
) ||
4910 test_access(NFS4_SHARE_ACCESS_WRITE
, stp
);
4914 access_permit_write(struct nfs4_ol_stateid
*stp
)
4916 return test_access(NFS4_SHARE_ACCESS_WRITE
, stp
) ||
4917 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
);
4921 __be32
nfs4_check_openmode(struct nfs4_ol_stateid
*stp
, int flags
)
4923 __be32 status
= nfserr_openmode
;
4925 /* For lock stateid's, we test the parent open, not the lock: */
4926 if (stp
->st_openstp
)
4927 stp
= stp
->st_openstp
;
4928 if ((flags
& WR_STATE
) && !access_permit_write(stp
))
4930 if ((flags
& RD_STATE
) && !access_permit_read(stp
))
4937 static inline __be32
4938 check_special_stateids(struct net
*net
, svc_fh
*current_fh
, stateid_t
*stateid
, int flags
)
4940 if (ONE_STATEID(stateid
) && (flags
& RD_STATE
))
4942 else if (opens_in_grace(net
)) {
4943 /* Answer in remaining cases depends on existence of
4944 * conflicting state; so we must wait out the grace period. */
4945 return nfserr_grace
;
4946 } else if (flags
& WR_STATE
)
4947 return nfs4_share_conflict(current_fh
,
4948 NFS4_SHARE_DENY_WRITE
);
4949 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4950 return nfs4_share_conflict(current_fh
,
4951 NFS4_SHARE_DENY_READ
);
4955 * Allow READ/WRITE during grace period on recovered state only for files
4956 * that are not able to provide mandatory locking.
4959 grace_disallows_io(struct net
*net
, struct inode
*inode
)
4961 return opens_in_grace(net
) && mandatory_lock(inode
);
4964 static __be32
check_stateid_generation(stateid_t
*in
, stateid_t
*ref
, bool has_session
)
4967 * When sessions are used the stateid generation number is ignored
4970 if (has_session
&& in
->si_generation
== 0)
4973 if (in
->si_generation
== ref
->si_generation
)
4976 /* If the client sends us a stateid from the future, it's buggy: */
4977 if (nfsd4_stateid_generation_after(in
, ref
))
4978 return nfserr_bad_stateid
;
4980 * However, we could see a stateid from the past, even from a
4981 * non-buggy client. For example, if the client sends a lock
4982 * while some IO is outstanding, the lock may bump si_generation
4983 * while the IO is still in flight. The client could avoid that
4984 * situation by waiting for responses on all the IO requests,
4985 * but better performance may result in retrying IO that
4986 * receives an old_stateid error if requests are rarely
4987 * reordered in flight:
4989 return nfserr_old_stateid
;
4992 static __be32
nfsd4_stid_check_stateid_generation(stateid_t
*in
, struct nfs4_stid
*s
, bool has_session
)
4996 spin_lock(&s
->sc_lock
);
4997 ret
= nfsd4_verify_open_stid(s
);
4999 ret
= check_stateid_generation(in
, &s
->sc_stateid
, has_session
);
5000 spin_unlock(&s
->sc_lock
);
5004 static __be32
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid
*ols
)
5006 if (ols
->st_stateowner
->so_is_open_owner
&&
5007 !(openowner(ols
->st_stateowner
)->oo_flags
& NFS4_OO_CONFIRMED
))
5008 return nfserr_bad_stateid
;
5012 static __be32
nfsd4_validate_stateid(struct nfs4_client
*cl
, stateid_t
*stateid
)
5014 struct nfs4_stid
*s
;
5015 __be32 status
= nfserr_bad_stateid
;
5017 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
) ||
5018 CLOSE_STATEID(stateid
))
5020 /* Client debugging aid. */
5021 if (!same_clid(&stateid
->si_opaque
.so_clid
, &cl
->cl_clientid
)) {
5022 char addr_str
[INET6_ADDRSTRLEN
];
5023 rpc_ntop((struct sockaddr
*)&cl
->cl_addr
, addr_str
,
5025 pr_warn_ratelimited("NFSD: client %s testing state ID "
5026 "with incorrect client ID\n", addr_str
);
5029 spin_lock(&cl
->cl_lock
);
5030 s
= find_stateid_locked(cl
, stateid
);
5033 status
= nfsd4_stid_check_stateid_generation(stateid
, s
, 1);
5036 switch (s
->sc_type
) {
5037 case NFS4_DELEG_STID
:
5040 case NFS4_REVOKED_DELEG_STID
:
5041 status
= nfserr_deleg_revoked
;
5043 case NFS4_OPEN_STID
:
5044 case NFS4_LOCK_STID
:
5045 status
= nfsd4_check_openowner_confirmed(openlockstateid(s
));
5048 printk("unknown stateid type %x\n", s
->sc_type
);
5050 case NFS4_CLOSED_STID
:
5051 case NFS4_CLOSED_DELEG_STID
:
5052 status
= nfserr_bad_stateid
;
5055 spin_unlock(&cl
->cl_lock
);
5060 nfsd4_lookup_stateid(struct nfsd4_compound_state
*cstate
,
5061 stateid_t
*stateid
, unsigned char typemask
,
5062 struct nfs4_stid
**s
, struct nfsd_net
*nn
)
5065 bool return_revoked
= false;
5068 * only return revoked delegations if explicitly asked.
5069 * otherwise we report revoked or bad_stateid status.
5071 if (typemask
& NFS4_REVOKED_DELEG_STID
)
5072 return_revoked
= true;
5073 else if (typemask
& NFS4_DELEG_STID
)
5074 typemask
|= NFS4_REVOKED_DELEG_STID
;
5076 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
) ||
5077 CLOSE_STATEID(stateid
))
5078 return nfserr_bad_stateid
;
5079 status
= lookup_clientid(&stateid
->si_opaque
.so_clid
, cstate
, nn
);
5080 if (status
== nfserr_stale_clientid
) {
5081 if (cstate
->session
)
5082 return nfserr_bad_stateid
;
5083 return nfserr_stale_stateid
;
5087 *s
= find_stateid_by_type(cstate
->clp
, stateid
, typemask
);
5089 return nfserr_bad_stateid
;
5090 if (((*s
)->sc_type
== NFS4_REVOKED_DELEG_STID
) && !return_revoked
) {
5092 if (cstate
->minorversion
)
5093 return nfserr_deleg_revoked
;
5094 return nfserr_bad_stateid
;
5099 static struct file
*
5100 nfs4_find_file(struct nfs4_stid
*s
, int flags
)
5105 switch (s
->sc_type
) {
5106 case NFS4_DELEG_STID
:
5107 if (WARN_ON_ONCE(!s
->sc_file
->fi_deleg_file
))
5109 return get_file(s
->sc_file
->fi_deleg_file
);
5110 case NFS4_OPEN_STID
:
5111 case NFS4_LOCK_STID
:
5112 if (flags
& RD_STATE
)
5113 return find_readable_file(s
->sc_file
);
5115 return find_writeable_file(s
->sc_file
);
5123 nfs4_check_olstateid(struct nfs4_ol_stateid
*ols
, int flags
)
5127 status
= nfsd4_check_openowner_confirmed(ols
);
5130 return nfs4_check_openmode(ols
, flags
);
5134 nfs4_check_file(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct nfs4_stid
*s
,
5135 struct file
**filpp
, bool *tmp_file
, int flags
)
5137 int acc
= (flags
& RD_STATE
) ? NFSD_MAY_READ
: NFSD_MAY_WRITE
;
5141 file
= nfs4_find_file(s
, flags
);
5143 status
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
5144 acc
| NFSD_MAY_OWNER_OVERRIDE
);
5152 status
= nfsd_open(rqstp
, fhp
, S_IFREG
, acc
, filpp
);
5164 * Checks for stateid operations
5167 nfs4_preprocess_stateid_op(struct svc_rqst
*rqstp
,
5168 struct nfsd4_compound_state
*cstate
, struct svc_fh
*fhp
,
5169 stateid_t
*stateid
, int flags
, struct file
**filpp
, bool *tmp_file
)
5171 struct inode
*ino
= d_inode(fhp
->fh_dentry
);
5172 struct net
*net
= SVC_NET(rqstp
);
5173 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5174 struct nfs4_stid
*s
= NULL
;
5182 if (grace_disallows_io(net
, ino
))
5183 return nfserr_grace
;
5185 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
)) {
5186 status
= check_special_stateids(net
, fhp
, stateid
, flags
);
5190 status
= nfsd4_lookup_stateid(cstate
, stateid
,
5191 NFS4_DELEG_STID
|NFS4_OPEN_STID
|NFS4_LOCK_STID
,
5195 status
= nfsd4_stid_check_stateid_generation(stateid
, s
,
5196 nfsd4_has_session(cstate
));
5200 switch (s
->sc_type
) {
5201 case NFS4_DELEG_STID
:
5202 status
= nfs4_check_delegmode(delegstateid(s
), flags
);
5204 case NFS4_OPEN_STID
:
5205 case NFS4_LOCK_STID
:
5206 status
= nfs4_check_olstateid(openlockstateid(s
), flags
);
5209 status
= nfserr_bad_stateid
;
5214 status
= nfs4_check_fh(fhp
, s
);
5217 if (!status
&& filpp
)
5218 status
= nfs4_check_file(rqstp
, fhp
, s
, filpp
, tmp_file
, flags
);
5226 * Test if the stateid is valid
5229 nfsd4_test_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5230 union nfsd4_op_u
*u
)
5232 struct nfsd4_test_stateid
*test_stateid
= &u
->test_stateid
;
5233 struct nfsd4_test_stateid_id
*stateid
;
5234 struct nfs4_client
*cl
= cstate
->session
->se_client
;
5236 list_for_each_entry(stateid
, &test_stateid
->ts_stateid_list
, ts_id_list
)
5237 stateid
->ts_id_status
=
5238 nfsd4_validate_stateid(cl
, &stateid
->ts_id_stateid
);
5244 nfsd4_free_lock_stateid(stateid_t
*stateid
, struct nfs4_stid
*s
)
5246 struct nfs4_ol_stateid
*stp
= openlockstateid(s
);
5249 ret
= nfsd4_lock_ol_stateid(stp
);
5253 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
5257 ret
= nfserr_locks_held
;
5258 if (check_for_locks(stp
->st_stid
.sc_file
,
5259 lockowner(stp
->st_stateowner
)))
5262 release_lock_stateid(stp
);
5266 mutex_unlock(&stp
->st_mutex
);
5273 nfsd4_free_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5274 union nfsd4_op_u
*u
)
5276 struct nfsd4_free_stateid
*free_stateid
= &u
->free_stateid
;
5277 stateid_t
*stateid
= &free_stateid
->fr_stateid
;
5278 struct nfs4_stid
*s
;
5279 struct nfs4_delegation
*dp
;
5280 struct nfs4_client
*cl
= cstate
->session
->se_client
;
5281 __be32 ret
= nfserr_bad_stateid
;
5283 spin_lock(&cl
->cl_lock
);
5284 s
= find_stateid_locked(cl
, stateid
);
5287 spin_lock(&s
->sc_lock
);
5288 switch (s
->sc_type
) {
5289 case NFS4_DELEG_STID
:
5290 ret
= nfserr_locks_held
;
5292 case NFS4_OPEN_STID
:
5293 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
5296 ret
= nfserr_locks_held
;
5298 case NFS4_LOCK_STID
:
5299 spin_unlock(&s
->sc_lock
);
5300 refcount_inc(&s
->sc_count
);
5301 spin_unlock(&cl
->cl_lock
);
5302 ret
= nfsd4_free_lock_stateid(stateid
, s
);
5304 case NFS4_REVOKED_DELEG_STID
:
5305 spin_unlock(&s
->sc_lock
);
5306 dp
= delegstateid(s
);
5307 list_del_init(&dp
->dl_recall_lru
);
5308 spin_unlock(&cl
->cl_lock
);
5312 /* Default falls through and returns nfserr_bad_stateid */
5314 spin_unlock(&s
->sc_lock
);
5316 spin_unlock(&cl
->cl_lock
);
5324 return (type
== NFS4_READW_LT
|| type
== NFS4_READ_LT
) ?
5325 RD_STATE
: WR_STATE
;
5328 static __be32
nfs4_seqid_op_checks(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
, u32 seqid
, struct nfs4_ol_stateid
*stp
)
5330 struct svc_fh
*current_fh
= &cstate
->current_fh
;
5331 struct nfs4_stateowner
*sop
= stp
->st_stateowner
;
5334 status
= nfsd4_check_seqid(cstate
, sop
, seqid
);
5337 status
= nfsd4_lock_ol_stateid(stp
);
5338 if (status
!= nfs_ok
)
5340 status
= check_stateid_generation(stateid
, &stp
->st_stid
.sc_stateid
, nfsd4_has_session(cstate
));
5341 if (status
== nfs_ok
)
5342 status
= nfs4_check_fh(current_fh
, &stp
->st_stid
);
5343 if (status
!= nfs_ok
)
5344 mutex_unlock(&stp
->st_mutex
);
5349 * Checks for sequence id mutating operations.
5352 nfs4_preprocess_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
5353 stateid_t
*stateid
, char typemask
,
5354 struct nfs4_ol_stateid
**stpp
,
5355 struct nfsd_net
*nn
)
5358 struct nfs4_stid
*s
;
5359 struct nfs4_ol_stateid
*stp
= NULL
;
5361 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT
"\n", __func__
,
5362 seqid
, STATEID_VAL(stateid
));
5365 status
= nfsd4_lookup_stateid(cstate
, stateid
, typemask
, &s
, nn
);
5368 stp
= openlockstateid(s
);
5369 nfsd4_cstate_assign_replay(cstate
, stp
->st_stateowner
);
5371 status
= nfs4_seqid_op_checks(cstate
, stateid
, seqid
, stp
);
5375 nfs4_put_stid(&stp
->st_stid
);
5379 static __be32
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
5380 stateid_t
*stateid
, struct nfs4_ol_stateid
**stpp
, struct nfsd_net
*nn
)
5383 struct nfs4_openowner
*oo
;
5384 struct nfs4_ol_stateid
*stp
;
5386 status
= nfs4_preprocess_seqid_op(cstate
, seqid
, stateid
,
5387 NFS4_OPEN_STID
, &stp
, nn
);
5390 oo
= openowner(stp
->st_stateowner
);
5391 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
5392 mutex_unlock(&stp
->st_mutex
);
5393 nfs4_put_stid(&stp
->st_stid
);
5394 return nfserr_bad_stateid
;
5401 nfsd4_open_confirm(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5402 union nfsd4_op_u
*u
)
5404 struct nfsd4_open_confirm
*oc
= &u
->open_confirm
;
5406 struct nfs4_openowner
*oo
;
5407 struct nfs4_ol_stateid
*stp
;
5408 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5410 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5411 cstate
->current_fh
.fh_dentry
);
5413 status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0);
5417 status
= nfs4_preprocess_seqid_op(cstate
,
5418 oc
->oc_seqid
, &oc
->oc_req_stateid
,
5419 NFS4_OPEN_STID
, &stp
, nn
);
5422 oo
= openowner(stp
->st_stateowner
);
5423 status
= nfserr_bad_stateid
;
5424 if (oo
->oo_flags
& NFS4_OO_CONFIRMED
) {
5425 mutex_unlock(&stp
->st_mutex
);
5428 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
5429 nfs4_inc_and_copy_stateid(&oc
->oc_resp_stateid
, &stp
->st_stid
);
5430 mutex_unlock(&stp
->st_mutex
);
5431 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT
"\n",
5432 __func__
, oc
->oc_seqid
, STATEID_VAL(&stp
->st_stid
.sc_stateid
));
5434 nfsd4_client_record_create(oo
->oo_owner
.so_client
);
5437 nfs4_put_stid(&stp
->st_stid
);
5439 nfsd4_bump_seqid(cstate
, status
);
5443 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid
*stp
, u32 access
)
5445 if (!test_access(access
, stp
))
5447 nfs4_file_put_access(stp
->st_stid
.sc_file
, access
);
5448 clear_access(access
, stp
);
5451 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid
*stp
, u32 to_access
)
5453 switch (to_access
) {
5454 case NFS4_SHARE_ACCESS_READ
:
5455 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_WRITE
);
5456 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5458 case NFS4_SHARE_ACCESS_WRITE
:
5459 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_READ
);
5460 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5462 case NFS4_SHARE_ACCESS_BOTH
:
5470 nfsd4_open_downgrade(struct svc_rqst
*rqstp
,
5471 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
5473 struct nfsd4_open_downgrade
*od
= &u
->open_downgrade
;
5475 struct nfs4_ol_stateid
*stp
;
5476 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5478 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5479 cstate
->current_fh
.fh_dentry
);
5481 /* We don't yet support WANT bits: */
5482 if (od
->od_deleg_want
)
5483 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__
,
5486 status
= nfs4_preprocess_confirmed_seqid_op(cstate
, od
->od_seqid
,
5487 &od
->od_stateid
, &stp
, nn
);
5490 status
= nfserr_inval
;
5491 if (!test_access(od
->od_share_access
, stp
)) {
5492 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5493 stp
->st_access_bmap
, od
->od_share_access
);
5496 if (!test_deny(od
->od_share_deny
, stp
)) {
5497 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5498 stp
->st_deny_bmap
, od
->od_share_deny
);
5501 nfs4_stateid_downgrade(stp
, od
->od_share_access
);
5502 reset_union_bmap_deny(od
->od_share_deny
, stp
);
5503 nfs4_inc_and_copy_stateid(&od
->od_stateid
, &stp
->st_stid
);
5506 mutex_unlock(&stp
->st_mutex
);
5507 nfs4_put_stid(&stp
->st_stid
);
5509 nfsd4_bump_seqid(cstate
, status
);
5513 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid
*s
)
5515 struct nfs4_client
*clp
= s
->st_stid
.sc_client
;
5517 LIST_HEAD(reaplist
);
5519 spin_lock(&clp
->cl_lock
);
5520 unhashed
= unhash_open_stateid(s
, &reaplist
);
5522 if (clp
->cl_minorversion
) {
5524 put_ol_stateid_locked(s
, &reaplist
);
5525 spin_unlock(&clp
->cl_lock
);
5526 free_ol_stateid_reaplist(&reaplist
);
5528 spin_unlock(&clp
->cl_lock
);
5529 free_ol_stateid_reaplist(&reaplist
);
5531 move_to_close_lru(s
, clp
->net
);
5536 * nfs4_unlock_state() called after encode
5539 nfsd4_close(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5540 union nfsd4_op_u
*u
)
5542 struct nfsd4_close
*close
= &u
->close
;
5544 struct nfs4_ol_stateid
*stp
;
5545 struct net
*net
= SVC_NET(rqstp
);
5546 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5548 dprintk("NFSD: nfsd4_close on file %pd\n",
5549 cstate
->current_fh
.fh_dentry
);
5551 status
= nfs4_preprocess_seqid_op(cstate
, close
->cl_seqid
,
5553 NFS4_OPEN_STID
|NFS4_CLOSED_STID
,
5555 nfsd4_bump_seqid(cstate
, status
);
5559 stp
->st_stid
.sc_type
= NFS4_CLOSED_STID
;
5562 * Technically we don't _really_ have to increment or copy it, since
5563 * it should just be gone after this operation and we clobber the
5564 * copied value below, but we continue to do so here just to ensure
5565 * that racing ops see that there was a state change.
5567 nfs4_inc_and_copy_stateid(&close
->cl_stateid
, &stp
->st_stid
);
5569 nfsd4_close_open_stateid(stp
);
5570 mutex_unlock(&stp
->st_mutex
);
5572 /* v4.1+ suggests that we send a special stateid in here, since the
5573 * clients should just ignore this anyway. Since this is not useful
5574 * for v4.0 clients either, we set it to the special close_stateid
5577 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
5579 memcpy(&close
->cl_stateid
, &close_stateid
, sizeof(close
->cl_stateid
));
5581 /* put reference from nfs4_preprocess_seqid_op */
5582 nfs4_put_stid(&stp
->st_stid
);
5588 nfsd4_delegreturn(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5589 union nfsd4_op_u
*u
)
5591 struct nfsd4_delegreturn
*dr
= &u
->delegreturn
;
5592 struct nfs4_delegation
*dp
;
5593 stateid_t
*stateid
= &dr
->dr_stateid
;
5594 struct nfs4_stid
*s
;
5596 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5598 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
5601 status
= nfsd4_lookup_stateid(cstate
, stateid
, NFS4_DELEG_STID
, &s
, nn
);
5604 dp
= delegstateid(s
);
5605 status
= nfsd4_stid_check_stateid_generation(stateid
, &dp
->dl_stid
, nfsd4_has_session(cstate
));
5609 destroy_delegation(dp
);
5611 nfs4_put_stid(&dp
->dl_stid
);
5617 end_offset(u64 start
, u64 len
)
5622 return end
>= start
? end
: NFS4_MAX_UINT64
;
5625 /* last octet in a range */
5627 last_byte_offset(u64 start
, u64 len
)
5633 return end
> start
? end
- 1: NFS4_MAX_UINT64
;
5637 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5638 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5639 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5640 * locking, this prevents us from being completely protocol-compliant. The
5641 * real solution to this problem is to start using unsigned file offsets in
5642 * the VFS, but this is a very deep change!
5645 nfs4_transform_lock_offset(struct file_lock
*lock
)
5647 if (lock
->fl_start
< 0)
5648 lock
->fl_start
= OFFSET_MAX
;
5649 if (lock
->fl_end
< 0)
5650 lock
->fl_end
= OFFSET_MAX
;
5654 nfsd4_fl_get_owner(fl_owner_t owner
)
5656 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5658 nfs4_get_stateowner(&lo
->lo_owner
);
5663 nfsd4_fl_put_owner(fl_owner_t owner
)
5665 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5668 nfs4_put_stateowner(&lo
->lo_owner
);
5672 nfsd4_lm_notify(struct file_lock
*fl
)
5674 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)fl
->fl_owner
;
5675 struct net
*net
= lo
->lo_owner
.so_client
->net
;
5676 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5677 struct nfsd4_blocked_lock
*nbl
= container_of(fl
,
5678 struct nfsd4_blocked_lock
, nbl_lock
);
5681 /* An empty list means that something else is going to be using it */
5682 spin_lock(&nn
->blocked_locks_lock
);
5683 if (!list_empty(&nbl
->nbl_list
)) {
5684 list_del_init(&nbl
->nbl_list
);
5685 list_del_init(&nbl
->nbl_lru
);
5688 spin_unlock(&nn
->blocked_locks_lock
);
5691 nfsd4_run_cb(&nbl
->nbl_cb
);
5694 static const struct lock_manager_operations nfsd_posix_mng_ops
= {
5695 .lm_notify
= nfsd4_lm_notify
,
5696 .lm_get_owner
= nfsd4_fl_get_owner
,
5697 .lm_put_owner
= nfsd4_fl_put_owner
,
5701 nfs4_set_lock_denied(struct file_lock
*fl
, struct nfsd4_lock_denied
*deny
)
5703 struct nfs4_lockowner
*lo
;
5705 if (fl
->fl_lmops
== &nfsd_posix_mng_ops
) {
5706 lo
= (struct nfs4_lockowner
*) fl
->fl_owner
;
5707 deny
->ld_owner
.data
= kmemdup(lo
->lo_owner
.so_owner
.data
,
5708 lo
->lo_owner
.so_owner
.len
, GFP_KERNEL
);
5709 if (!deny
->ld_owner
.data
)
5710 /* We just don't care that much */
5712 deny
->ld_owner
.len
= lo
->lo_owner
.so_owner
.len
;
5713 deny
->ld_clientid
= lo
->lo_owner
.so_client
->cl_clientid
;
5716 deny
->ld_owner
.len
= 0;
5717 deny
->ld_owner
.data
= NULL
;
5718 deny
->ld_clientid
.cl_boot
= 0;
5719 deny
->ld_clientid
.cl_id
= 0;
5721 deny
->ld_start
= fl
->fl_start
;
5722 deny
->ld_length
= NFS4_MAX_UINT64
;
5723 if (fl
->fl_end
!= NFS4_MAX_UINT64
)
5724 deny
->ld_length
= fl
->fl_end
- fl
->fl_start
+ 1;
5725 deny
->ld_type
= NFS4_READ_LT
;
5726 if (fl
->fl_type
!= F_RDLCK
)
5727 deny
->ld_type
= NFS4_WRITE_LT
;
5730 static struct nfs4_lockowner
*
5731 find_lockowner_str_locked(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5733 unsigned int strhashval
= ownerstr_hashval(owner
);
5734 struct nfs4_stateowner
*so
;
5736 lockdep_assert_held(&clp
->cl_lock
);
5738 list_for_each_entry(so
, &clp
->cl_ownerstr_hashtbl
[strhashval
],
5740 if (so
->so_is_open_owner
)
5742 if (same_owner_str(so
, owner
))
5743 return lockowner(nfs4_get_stateowner(so
));
5748 static struct nfs4_lockowner
*
5749 find_lockowner_str(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5751 struct nfs4_lockowner
*lo
;
5753 spin_lock(&clp
->cl_lock
);
5754 lo
= find_lockowner_str_locked(clp
, owner
);
5755 spin_unlock(&clp
->cl_lock
);
5759 static void nfs4_unhash_lockowner(struct nfs4_stateowner
*sop
)
5761 unhash_lockowner_locked(lockowner(sop
));
5764 static void nfs4_free_lockowner(struct nfs4_stateowner
*sop
)
5766 struct nfs4_lockowner
*lo
= lockowner(sop
);
5768 kmem_cache_free(lockowner_slab
, lo
);
5771 static const struct nfs4_stateowner_operations lockowner_ops
= {
5772 .so_unhash
= nfs4_unhash_lockowner
,
5773 .so_free
= nfs4_free_lockowner
,
5777 * Alloc a lock owner structure.
5778 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5781 * strhashval = ownerstr_hashval
5783 static struct nfs4_lockowner
*
5784 alloc_init_lock_stateowner(unsigned int strhashval
, struct nfs4_client
*clp
,
5785 struct nfs4_ol_stateid
*open_stp
,
5786 struct nfsd4_lock
*lock
)
5788 struct nfs4_lockowner
*lo
, *ret
;
5790 lo
= alloc_stateowner(lockowner_slab
, &lock
->lk_new_owner
, clp
);
5793 INIT_LIST_HEAD(&lo
->lo_blocked
);
5794 INIT_LIST_HEAD(&lo
->lo_owner
.so_stateids
);
5795 lo
->lo_owner
.so_is_open_owner
= 0;
5796 lo
->lo_owner
.so_seqid
= lock
->lk_new_lock_seqid
;
5797 lo
->lo_owner
.so_ops
= &lockowner_ops
;
5798 spin_lock(&clp
->cl_lock
);
5799 ret
= find_lockowner_str_locked(clp
, &lock
->lk_new_owner
);
5801 list_add(&lo
->lo_owner
.so_strhash
,
5802 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
5805 nfs4_free_stateowner(&lo
->lo_owner
);
5807 spin_unlock(&clp
->cl_lock
);
5811 static struct nfs4_ol_stateid
*
5812 find_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fp
)
5814 struct nfs4_ol_stateid
*lst
;
5815 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5817 lockdep_assert_held(&clp
->cl_lock
);
5819 list_for_each_entry(lst
, &lo
->lo_owner
.so_stateids
, st_perstateowner
) {
5820 if (lst
->st_stid
.sc_type
!= NFS4_LOCK_STID
)
5822 if (lst
->st_stid
.sc_file
== fp
) {
5823 refcount_inc(&lst
->st_stid
.sc_count
);
5830 static struct nfs4_ol_stateid
*
5831 init_lock_stateid(struct nfs4_ol_stateid
*stp
, struct nfs4_lockowner
*lo
,
5832 struct nfs4_file
*fp
, struct inode
*inode
,
5833 struct nfs4_ol_stateid
*open_stp
)
5835 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5836 struct nfs4_ol_stateid
*retstp
;
5838 mutex_init(&stp
->st_mutex
);
5839 mutex_lock_nested(&stp
->st_mutex
, OPEN_STATEID_MUTEX
);
5841 spin_lock(&clp
->cl_lock
);
5842 spin_lock(&fp
->fi_lock
);
5843 retstp
= find_lock_stateid(lo
, fp
);
5847 refcount_inc(&stp
->st_stid
.sc_count
);
5848 stp
->st_stid
.sc_type
= NFS4_LOCK_STID
;
5849 stp
->st_stateowner
= nfs4_get_stateowner(&lo
->lo_owner
);
5851 stp
->st_stid
.sc_file
= fp
;
5852 stp
->st_access_bmap
= 0;
5853 stp
->st_deny_bmap
= open_stp
->st_deny_bmap
;
5854 stp
->st_openstp
= open_stp
;
5855 list_add(&stp
->st_locks
, &open_stp
->st_locks
);
5856 list_add(&stp
->st_perstateowner
, &lo
->lo_owner
.so_stateids
);
5857 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
5859 spin_unlock(&fp
->fi_lock
);
5860 spin_unlock(&clp
->cl_lock
);
5862 if (nfsd4_lock_ol_stateid(retstp
) != nfs_ok
) {
5863 nfs4_put_stid(&retstp
->st_stid
);
5866 /* To keep mutex tracking happy */
5867 mutex_unlock(&stp
->st_mutex
);
5873 static struct nfs4_ol_stateid
*
5874 find_or_create_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fi
,
5875 struct inode
*inode
, struct nfs4_ol_stateid
*ost
,
5878 struct nfs4_stid
*ns
= NULL
;
5879 struct nfs4_ol_stateid
*lst
;
5880 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5881 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
5884 spin_lock(&clp
->cl_lock
);
5885 lst
= find_lock_stateid(lo
, fi
);
5886 spin_unlock(&clp
->cl_lock
);
5888 if (nfsd4_lock_ol_stateid(lst
) == nfs_ok
)
5890 nfs4_put_stid(&lst
->st_stid
);
5892 ns
= nfs4_alloc_stid(clp
, stateid_slab
, nfs4_free_lock_stateid
);
5896 lst
= init_lock_stateid(openlockstateid(ns
), lo
, fi
, inode
, ost
);
5897 if (lst
== openlockstateid(ns
))
5906 check_lock_length(u64 offset
, u64 length
)
5908 return ((length
== 0) || ((length
!= NFS4_MAX_UINT64
) &&
5909 (length
> ~offset
)));
5912 static void get_lock_access(struct nfs4_ol_stateid
*lock_stp
, u32 access
)
5914 struct nfs4_file
*fp
= lock_stp
->st_stid
.sc_file
;
5916 lockdep_assert_held(&fp
->fi_lock
);
5918 if (test_access(access
, lock_stp
))
5920 __nfs4_file_get_access(fp
, access
);
5921 set_access(access
, lock_stp
);
5925 lookup_or_create_lock_state(struct nfsd4_compound_state
*cstate
,
5926 struct nfs4_ol_stateid
*ost
,
5927 struct nfsd4_lock
*lock
,
5928 struct nfs4_ol_stateid
**plst
, bool *new)
5931 struct nfs4_file
*fi
= ost
->st_stid
.sc_file
;
5932 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5933 struct nfs4_client
*cl
= oo
->oo_owner
.so_client
;
5934 struct inode
*inode
= d_inode(cstate
->current_fh
.fh_dentry
);
5935 struct nfs4_lockowner
*lo
;
5936 struct nfs4_ol_stateid
*lst
;
5937 unsigned int strhashval
;
5939 lo
= find_lockowner_str(cl
, &lock
->lk_new_owner
);
5941 strhashval
= ownerstr_hashval(&lock
->lk_new_owner
);
5942 lo
= alloc_init_lock_stateowner(strhashval
, cl
, ost
, lock
);
5944 return nfserr_jukebox
;
5946 /* with an existing lockowner, seqids must be the same */
5947 status
= nfserr_bad_seqid
;
5948 if (!cstate
->minorversion
&&
5949 lock
->lk_new_lock_seqid
!= lo
->lo_owner
.so_seqid
)
5953 lst
= find_or_create_lock_stateid(lo
, fi
, inode
, ost
, new);
5955 status
= nfserr_jukebox
;
5962 nfs4_put_stateowner(&lo
->lo_owner
);
5970 nfsd4_lock(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5971 union nfsd4_op_u
*u
)
5973 struct nfsd4_lock
*lock
= &u
->lock
;
5974 struct nfs4_openowner
*open_sop
= NULL
;
5975 struct nfs4_lockowner
*lock_sop
= NULL
;
5976 struct nfs4_ol_stateid
*lock_stp
= NULL
;
5977 struct nfs4_ol_stateid
*open_stp
= NULL
;
5978 struct nfs4_file
*fp
;
5979 struct file
*filp
= NULL
;
5980 struct nfsd4_blocked_lock
*nbl
= NULL
;
5981 struct file_lock
*file_lock
= NULL
;
5982 struct file_lock
*conflock
= NULL
;
5987 unsigned char fl_type
;
5988 unsigned int fl_flags
= FL_POSIX
;
5989 struct net
*net
= SVC_NET(rqstp
);
5990 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5992 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5993 (long long) lock
->lk_offset
,
5994 (long long) lock
->lk_length
);
5996 if (check_lock_length(lock
->lk_offset
, lock
->lk_length
))
5997 return nfserr_inval
;
5999 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
,
6000 S_IFREG
, NFSD_MAY_LOCK
))) {
6001 dprintk("NFSD: nfsd4_lock: permission denied!\n");
6005 if (lock
->lk_is_new
) {
6006 if (nfsd4_has_session(cstate
))
6007 /* See rfc 5661 18.10.3: given clientid is ignored: */
6008 memcpy(&lock
->lk_new_clientid
,
6009 &cstate
->session
->se_client
->cl_clientid
,
6010 sizeof(clientid_t
));
6012 status
= nfserr_stale_clientid
;
6013 if (STALE_CLIENTID(&lock
->lk_new_clientid
, nn
))
6016 /* validate and update open stateid and open seqid */
6017 status
= nfs4_preprocess_confirmed_seqid_op(cstate
,
6018 lock
->lk_new_open_seqid
,
6019 &lock
->lk_new_open_stateid
,
6023 mutex_unlock(&open_stp
->st_mutex
);
6024 open_sop
= openowner(open_stp
->st_stateowner
);
6025 status
= nfserr_bad_stateid
;
6026 if (!same_clid(&open_sop
->oo_owner
.so_client
->cl_clientid
,
6027 &lock
->lk_new_clientid
))
6029 status
= lookup_or_create_lock_state(cstate
, open_stp
, lock
,
6032 status
= nfs4_preprocess_seqid_op(cstate
,
6033 lock
->lk_old_lock_seqid
,
6034 &lock
->lk_old_lock_stateid
,
6035 NFS4_LOCK_STID
, &lock_stp
, nn
);
6039 lock_sop
= lockowner(lock_stp
->st_stateowner
);
6041 lkflg
= setlkflg(lock
->lk_type
);
6042 status
= nfs4_check_openmode(lock_stp
, lkflg
);
6046 status
= nfserr_grace
;
6047 if (locks_in_grace(net
) && !lock
->lk_reclaim
)
6049 status
= nfserr_no_grace
;
6050 if (!locks_in_grace(net
) && lock
->lk_reclaim
)
6053 fp
= lock_stp
->st_stid
.sc_file
;
6054 switch (lock
->lk_type
) {
6056 if (nfsd4_has_session(cstate
))
6057 fl_flags
|= FL_SLEEP
;
6060 spin_lock(&fp
->fi_lock
);
6061 filp
= find_readable_file_locked(fp
);
6063 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_READ
);
6064 spin_unlock(&fp
->fi_lock
);
6067 case NFS4_WRITEW_LT
:
6068 if (nfsd4_has_session(cstate
))
6069 fl_flags
|= FL_SLEEP
;
6072 spin_lock(&fp
->fi_lock
);
6073 filp
= find_writeable_file_locked(fp
);
6075 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_WRITE
);
6076 spin_unlock(&fp
->fi_lock
);
6080 status
= nfserr_inval
;
6085 status
= nfserr_openmode
;
6089 nbl
= find_or_allocate_block(lock_sop
, &fp
->fi_fhandle
, nn
);
6091 dprintk("NFSD: %s: unable to allocate block!\n", __func__
);
6092 status
= nfserr_jukebox
;
6096 file_lock
= &nbl
->nbl_lock
;
6097 file_lock
->fl_type
= fl_type
;
6098 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(&lock_sop
->lo_owner
));
6099 file_lock
->fl_pid
= current
->tgid
;
6100 file_lock
->fl_file
= filp
;
6101 file_lock
->fl_flags
= fl_flags
;
6102 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
6103 file_lock
->fl_start
= lock
->lk_offset
;
6104 file_lock
->fl_end
= last_byte_offset(lock
->lk_offset
, lock
->lk_length
);
6105 nfs4_transform_lock_offset(file_lock
);
6107 conflock
= locks_alloc_lock();
6109 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6110 status
= nfserr_jukebox
;
6114 if (fl_flags
& FL_SLEEP
) {
6115 nbl
->nbl_time
= jiffies
;
6116 spin_lock(&nn
->blocked_locks_lock
);
6117 list_add_tail(&nbl
->nbl_list
, &lock_sop
->lo_blocked
);
6118 list_add_tail(&nbl
->nbl_lru
, &nn
->blocked_locks_lru
);
6119 spin_unlock(&nn
->blocked_locks_lock
);
6122 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, conflock
);
6124 case 0: /* success! */
6125 nfs4_inc_and_copy_stateid(&lock
->lk_resp_stateid
, &lock_stp
->st_stid
);
6127 if (lock
->lk_reclaim
)
6128 nn
->somebody_reclaimed
= true;
6130 case FILE_LOCK_DEFERRED
:
6133 case -EAGAIN
: /* conflock holds conflicting lock */
6134 status
= nfserr_denied
;
6135 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6136 nfs4_set_lock_denied(conflock
, &lock
->lk_denied
);
6139 status
= nfserr_deadlock
;
6142 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err
);
6143 status
= nfserrno(err
);
6148 /* dequeue it if we queued it before */
6149 if (fl_flags
& FL_SLEEP
) {
6150 spin_lock(&nn
->blocked_locks_lock
);
6151 list_del_init(&nbl
->nbl_list
);
6152 list_del_init(&nbl
->nbl_lru
);
6153 spin_unlock(&nn
->blocked_locks_lock
);
6155 free_blocked_lock(nbl
);
6160 /* Bump seqid manually if the 4.0 replay owner is openowner */
6161 if (cstate
->replay_owner
&&
6162 cstate
->replay_owner
!= &lock_sop
->lo_owner
&&
6163 seqid_mutating_err(ntohl(status
)))
6164 lock_sop
->lo_owner
.so_seqid
++;
6167 * If this is a new, never-before-used stateid, and we are
6168 * returning an error, then just go ahead and release it.
6171 release_lock_stateid(lock_stp
);
6173 mutex_unlock(&lock_stp
->st_mutex
);
6175 nfs4_put_stid(&lock_stp
->st_stid
);
6178 nfs4_put_stid(&open_stp
->st_stid
);
6179 nfsd4_bump_seqid(cstate
, status
);
6181 locks_free_lock(conflock
);
6186 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6187 * so we do a temporary open here just to get an open file to pass to
6188 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6191 static __be32
nfsd_test_lock(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file_lock
*lock
)
6194 __be32 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
6196 err
= nfserrno(vfs_test_lock(file
, lock
));
6206 nfsd4_lockt(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
6207 union nfsd4_op_u
*u
)
6209 struct nfsd4_lockt
*lockt
= &u
->lockt
;
6210 struct file_lock
*file_lock
= NULL
;
6211 struct nfs4_lockowner
*lo
= NULL
;
6213 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6215 if (locks_in_grace(SVC_NET(rqstp
)))
6216 return nfserr_grace
;
6218 if (check_lock_length(lockt
->lt_offset
, lockt
->lt_length
))
6219 return nfserr_inval
;
6221 if (!nfsd4_has_session(cstate
)) {
6222 status
= lookup_clientid(&lockt
->lt_clientid
, cstate
, nn
);
6227 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
6230 file_lock
= locks_alloc_lock();
6232 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6233 status
= nfserr_jukebox
;
6237 switch (lockt
->lt_type
) {
6240 file_lock
->fl_type
= F_RDLCK
;
6243 case NFS4_WRITEW_LT
:
6244 file_lock
->fl_type
= F_WRLCK
;
6247 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6248 status
= nfserr_inval
;
6252 lo
= find_lockowner_str(cstate
->clp
, &lockt
->lt_owner
);
6254 file_lock
->fl_owner
= (fl_owner_t
)lo
;
6255 file_lock
->fl_pid
= current
->tgid
;
6256 file_lock
->fl_flags
= FL_POSIX
;
6258 file_lock
->fl_start
= lockt
->lt_offset
;
6259 file_lock
->fl_end
= last_byte_offset(lockt
->lt_offset
, lockt
->lt_length
);
6261 nfs4_transform_lock_offset(file_lock
);
6263 status
= nfsd_test_lock(rqstp
, &cstate
->current_fh
, file_lock
);
6267 if (file_lock
->fl_type
!= F_UNLCK
) {
6268 status
= nfserr_denied
;
6269 nfs4_set_lock_denied(file_lock
, &lockt
->lt_denied
);
6273 nfs4_put_stateowner(&lo
->lo_owner
);
6275 locks_free_lock(file_lock
);
6280 nfsd4_locku(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
6281 union nfsd4_op_u
*u
)
6283 struct nfsd4_locku
*locku
= &u
->locku
;
6284 struct nfs4_ol_stateid
*stp
;
6285 struct file
*filp
= NULL
;
6286 struct file_lock
*file_lock
= NULL
;
6289 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6291 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6292 (long long) locku
->lu_offset
,
6293 (long long) locku
->lu_length
);
6295 if (check_lock_length(locku
->lu_offset
, locku
->lu_length
))
6296 return nfserr_inval
;
6298 status
= nfs4_preprocess_seqid_op(cstate
, locku
->lu_seqid
,
6299 &locku
->lu_stateid
, NFS4_LOCK_STID
,
6303 filp
= find_any_file(stp
->st_stid
.sc_file
);
6305 status
= nfserr_lock_range
;
6308 file_lock
= locks_alloc_lock();
6310 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6311 status
= nfserr_jukebox
;
6315 file_lock
->fl_type
= F_UNLCK
;
6316 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(stp
->st_stateowner
));
6317 file_lock
->fl_pid
= current
->tgid
;
6318 file_lock
->fl_file
= filp
;
6319 file_lock
->fl_flags
= FL_POSIX
;
6320 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
6321 file_lock
->fl_start
= locku
->lu_offset
;
6323 file_lock
->fl_end
= last_byte_offset(locku
->lu_offset
,
6325 nfs4_transform_lock_offset(file_lock
);
6327 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, NULL
);
6329 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6332 nfs4_inc_and_copy_stateid(&locku
->lu_stateid
, &stp
->st_stid
);
6336 mutex_unlock(&stp
->st_mutex
);
6337 nfs4_put_stid(&stp
->st_stid
);
6339 nfsd4_bump_seqid(cstate
, status
);
6341 locks_free_lock(file_lock
);
6345 status
= nfserrno(err
);
6351 * true: locks held by lockowner
6352 * false: no locks held by lockowner
6355 check_for_locks(struct nfs4_file
*fp
, struct nfs4_lockowner
*lowner
)
6357 struct file_lock
*fl
;
6359 struct file
*filp
= find_any_file(fp
);
6360 struct inode
*inode
;
6361 struct file_lock_context
*flctx
;
6364 /* Any valid lock stateid should have some sort of access */
6369 inode
= locks_inode(filp
);
6370 flctx
= inode
->i_flctx
;
6372 if (flctx
&& !list_empty_careful(&flctx
->flc_posix
)) {
6373 spin_lock(&flctx
->flc_lock
);
6374 list_for_each_entry(fl
, &flctx
->flc_posix
, fl_list
) {
6375 if (fl
->fl_owner
== (fl_owner_t
)lowner
) {
6380 spin_unlock(&flctx
->flc_lock
);
6387 nfsd4_release_lockowner(struct svc_rqst
*rqstp
,
6388 struct nfsd4_compound_state
*cstate
,
6389 union nfsd4_op_u
*u
)
6391 struct nfsd4_release_lockowner
*rlockowner
= &u
->release_lockowner
;
6392 clientid_t
*clid
= &rlockowner
->rl_clientid
;
6393 struct nfs4_stateowner
*sop
;
6394 struct nfs4_lockowner
*lo
= NULL
;
6395 struct nfs4_ol_stateid
*stp
;
6396 struct xdr_netobj
*owner
= &rlockowner
->rl_owner
;
6397 unsigned int hashval
= ownerstr_hashval(owner
);
6399 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6400 struct nfs4_client
*clp
;
6401 LIST_HEAD (reaplist
);
6403 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6404 clid
->cl_boot
, clid
->cl_id
);
6406 status
= lookup_clientid(clid
, cstate
, nn
);
6411 /* Find the matching lock stateowner */
6412 spin_lock(&clp
->cl_lock
);
6413 list_for_each_entry(sop
, &clp
->cl_ownerstr_hashtbl
[hashval
],
6416 if (sop
->so_is_open_owner
|| !same_owner_str(sop
, owner
))
6419 /* see if there are still any locks associated with it */
6420 lo
= lockowner(sop
);
6421 list_for_each_entry(stp
, &sop
->so_stateids
, st_perstateowner
) {
6422 if (check_for_locks(stp
->st_stid
.sc_file
, lo
)) {
6423 status
= nfserr_locks_held
;
6424 spin_unlock(&clp
->cl_lock
);
6429 nfs4_get_stateowner(sop
);
6433 spin_unlock(&clp
->cl_lock
);
6437 unhash_lockowner_locked(lo
);
6438 while (!list_empty(&lo
->lo_owner
.so_stateids
)) {
6439 stp
= list_first_entry(&lo
->lo_owner
.so_stateids
,
6440 struct nfs4_ol_stateid
,
6442 WARN_ON(!unhash_lock_stateid(stp
));
6443 put_ol_stateid_locked(stp
, &reaplist
);
6445 spin_unlock(&clp
->cl_lock
);
6446 free_ol_stateid_reaplist(&reaplist
);
6447 remove_blocked_locks(lo
);
6448 nfs4_put_stateowner(&lo
->lo_owner
);
6453 static inline struct nfs4_client_reclaim
*
6456 return kmalloc(sizeof(struct nfs4_client_reclaim
), GFP_KERNEL
);
6460 nfs4_has_reclaimed_state(const char *name
, struct nfsd_net
*nn
)
6462 struct nfs4_client_reclaim
*crp
;
6464 crp
= nfsd4_find_reclaim_client(name
, nn
);
6465 return (crp
&& crp
->cr_clp
);
6469 * failure => all reset bets are off, nfserr_no_grace...
6471 struct nfs4_client_reclaim
*
6472 nfs4_client_to_reclaim(const char *name
, struct nfsd_net
*nn
)
6474 unsigned int strhashval
;
6475 struct nfs4_client_reclaim
*crp
;
6477 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN
, name
);
6478 crp
= alloc_reclaim();
6480 strhashval
= clientstr_hashval(name
);
6481 INIT_LIST_HEAD(&crp
->cr_strhash
);
6482 list_add(&crp
->cr_strhash
, &nn
->reclaim_str_hashtbl
[strhashval
]);
6483 memcpy(crp
->cr_recdir
, name
, HEXDIR_LEN
);
6485 nn
->reclaim_str_hashtbl_size
++;
6491 nfs4_remove_reclaim_record(struct nfs4_client_reclaim
*crp
, struct nfsd_net
*nn
)
6493 list_del(&crp
->cr_strhash
);
6495 nn
->reclaim_str_hashtbl_size
--;
6499 nfs4_release_reclaim(struct nfsd_net
*nn
)
6501 struct nfs4_client_reclaim
*crp
= NULL
;
6504 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6505 while (!list_empty(&nn
->reclaim_str_hashtbl
[i
])) {
6506 crp
= list_entry(nn
->reclaim_str_hashtbl
[i
].next
,
6507 struct nfs4_client_reclaim
, cr_strhash
);
6508 nfs4_remove_reclaim_record(crp
, nn
);
6511 WARN_ON_ONCE(nn
->reclaim_str_hashtbl_size
);
6515 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6516 struct nfs4_client_reclaim
*
6517 nfsd4_find_reclaim_client(const char *recdir
, struct nfsd_net
*nn
)
6519 unsigned int strhashval
;
6520 struct nfs4_client_reclaim
*crp
= NULL
;
6522 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir
);
6524 strhashval
= clientstr_hashval(recdir
);
6525 list_for_each_entry(crp
, &nn
->reclaim_str_hashtbl
[strhashval
], cr_strhash
) {
6526 if (same_name(crp
->cr_recdir
, recdir
)) {
6534 * Called from OPEN. Look for clientid in reclaim list.
6537 nfs4_check_open_reclaim(clientid_t
*clid
,
6538 struct nfsd4_compound_state
*cstate
,
6539 struct nfsd_net
*nn
)
6543 /* find clientid in conf_id_hashtbl */
6544 status
= lookup_clientid(clid
, cstate
, nn
);
6546 return nfserr_reclaim_bad
;
6548 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
, &cstate
->clp
->cl_flags
))
6549 return nfserr_no_grace
;
6551 if (nfsd4_client_record_check(cstate
->clp
))
6552 return nfserr_reclaim_bad
;
6557 #ifdef CONFIG_NFSD_FAULT_INJECTION
6559 put_client(struct nfs4_client
*clp
)
6561 atomic_dec(&clp
->cl_refcount
);
6564 static struct nfs4_client
*
6565 nfsd_find_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6567 struct nfs4_client
*clp
;
6568 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6571 if (!nfsd_netns_ready(nn
))
6574 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6575 if (memcmp(&clp
->cl_addr
, addr
, addr_size
) == 0)
6582 nfsd_inject_print_clients(void)
6584 struct nfs4_client
*clp
;
6586 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6588 char buf
[INET6_ADDRSTRLEN
];
6590 if (!nfsd_netns_ready(nn
))
6593 spin_lock(&nn
->client_lock
);
6594 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6595 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6596 pr_info("NFS Client: %s\n", buf
);
6599 spin_unlock(&nn
->client_lock
);
6605 nfsd_inject_forget_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6608 struct nfs4_client
*clp
;
6609 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6612 if (!nfsd_netns_ready(nn
))
6615 spin_lock(&nn
->client_lock
);
6616 clp
= nfsd_find_client(addr
, addr_size
);
6618 if (mark_client_expired_locked(clp
) == nfs_ok
)
6623 spin_unlock(&nn
->client_lock
);
6632 nfsd_inject_forget_clients(u64 max
)
6635 struct nfs4_client
*clp
, *next
;
6636 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6638 LIST_HEAD(reaplist
);
6640 if (!nfsd_netns_ready(nn
))
6643 spin_lock(&nn
->client_lock
);
6644 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
6645 if (mark_client_expired_locked(clp
) == nfs_ok
) {
6646 list_add(&clp
->cl_lru
, &reaplist
);
6647 if (max
!= 0 && ++count
>= max
)
6651 spin_unlock(&nn
->client_lock
);
6653 list_for_each_entry_safe(clp
, next
, &reaplist
, cl_lru
)
6659 static void nfsd_print_count(struct nfs4_client
*clp
, unsigned int count
,
6662 char buf
[INET6_ADDRSTRLEN
];
6663 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6664 printk(KERN_INFO
"NFS Client: %s has %u %s\n", buf
, count
, type
);
6668 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid
*lst
,
6669 struct list_head
*collect
)
6671 struct nfs4_client
*clp
= lst
->st_stid
.sc_client
;
6672 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6678 lockdep_assert_held(&nn
->client_lock
);
6679 atomic_inc(&clp
->cl_refcount
);
6680 list_add(&lst
->st_locks
, collect
);
6683 static u64
nfsd_foreach_client_lock(struct nfs4_client
*clp
, u64 max
,
6684 struct list_head
*collect
,
6685 bool (*func
)(struct nfs4_ol_stateid
*))
6687 struct nfs4_openowner
*oop
;
6688 struct nfs4_ol_stateid
*stp
, *st_next
;
6689 struct nfs4_ol_stateid
*lst
, *lst_next
;
6692 spin_lock(&clp
->cl_lock
);
6693 list_for_each_entry(oop
, &clp
->cl_openowners
, oo_perclient
) {
6694 list_for_each_entry_safe(stp
, st_next
,
6695 &oop
->oo_owner
.so_stateids
, st_perstateowner
) {
6696 list_for_each_entry_safe(lst
, lst_next
,
6697 &stp
->st_locks
, st_locks
) {
6700 nfsd_inject_add_lock_to_list(lst
,
6705 * Despite the fact that these functions deal
6706 * with 64-bit integers for "count", we must
6707 * ensure that it doesn't blow up the
6708 * clp->cl_refcount. Throw a warning if we
6709 * start to approach INT_MAX here.
6711 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6718 spin_unlock(&clp
->cl_lock
);
6724 nfsd_collect_client_locks(struct nfs4_client
*clp
, struct list_head
*collect
,
6727 return nfsd_foreach_client_lock(clp
, max
, collect
, unhash_lock_stateid
);
6731 nfsd_print_client_locks(struct nfs4_client
*clp
)
6733 u64 count
= nfsd_foreach_client_lock(clp
, 0, NULL
, NULL
);
6734 nfsd_print_count(clp
, count
, "locked files");
6739 nfsd_inject_print_locks(void)
6741 struct nfs4_client
*clp
;
6743 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6746 if (!nfsd_netns_ready(nn
))
6749 spin_lock(&nn
->client_lock
);
6750 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6751 count
+= nfsd_print_client_locks(clp
);
6752 spin_unlock(&nn
->client_lock
);
6758 nfsd_reap_locks(struct list_head
*reaplist
)
6760 struct nfs4_client
*clp
;
6761 struct nfs4_ol_stateid
*stp
, *next
;
6763 list_for_each_entry_safe(stp
, next
, reaplist
, st_locks
) {
6764 list_del_init(&stp
->st_locks
);
6765 clp
= stp
->st_stid
.sc_client
;
6766 nfs4_put_stid(&stp
->st_stid
);
6772 nfsd_inject_forget_client_locks(struct sockaddr_storage
*addr
, size_t addr_size
)
6774 unsigned int count
= 0;
6775 struct nfs4_client
*clp
;
6776 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6778 LIST_HEAD(reaplist
);
6780 if (!nfsd_netns_ready(nn
))
6783 spin_lock(&nn
->client_lock
);
6784 clp
= nfsd_find_client(addr
, addr_size
);
6786 count
= nfsd_collect_client_locks(clp
, &reaplist
, 0);
6787 spin_unlock(&nn
->client_lock
);
6788 nfsd_reap_locks(&reaplist
);
6793 nfsd_inject_forget_locks(u64 max
)
6796 struct nfs4_client
*clp
;
6797 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6799 LIST_HEAD(reaplist
);
6801 if (!nfsd_netns_ready(nn
))
6804 spin_lock(&nn
->client_lock
);
6805 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6806 count
+= nfsd_collect_client_locks(clp
, &reaplist
, max
- count
);
6807 if (max
!= 0 && count
>= max
)
6810 spin_unlock(&nn
->client_lock
);
6811 nfsd_reap_locks(&reaplist
);
6816 nfsd_foreach_client_openowner(struct nfs4_client
*clp
, u64 max
,
6817 struct list_head
*collect
,
6818 void (*func
)(struct nfs4_openowner
*))
6820 struct nfs4_openowner
*oop
, *next
;
6821 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6825 lockdep_assert_held(&nn
->client_lock
);
6827 spin_lock(&clp
->cl_lock
);
6828 list_for_each_entry_safe(oop
, next
, &clp
->cl_openowners
, oo_perclient
) {
6832 atomic_inc(&clp
->cl_refcount
);
6833 list_add(&oop
->oo_perclient
, collect
);
6838 * Despite the fact that these functions deal with
6839 * 64-bit integers for "count", we must ensure that
6840 * it doesn't blow up the clp->cl_refcount. Throw a
6841 * warning if we start to approach INT_MAX here.
6843 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6847 spin_unlock(&clp
->cl_lock
);
6853 nfsd_print_client_openowners(struct nfs4_client
*clp
)
6855 u64 count
= nfsd_foreach_client_openowner(clp
, 0, NULL
, NULL
);
6857 nfsd_print_count(clp
, count
, "openowners");
6862 nfsd_collect_client_openowners(struct nfs4_client
*clp
,
6863 struct list_head
*collect
, u64 max
)
6865 return nfsd_foreach_client_openowner(clp
, max
, collect
,
6866 unhash_openowner_locked
);
6870 nfsd_inject_print_openowners(void)
6872 struct nfs4_client
*clp
;
6874 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6877 if (!nfsd_netns_ready(nn
))
6880 spin_lock(&nn
->client_lock
);
6881 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6882 count
+= nfsd_print_client_openowners(clp
);
6883 spin_unlock(&nn
->client_lock
);
6889 nfsd_reap_openowners(struct list_head
*reaplist
)
6891 struct nfs4_client
*clp
;
6892 struct nfs4_openowner
*oop
, *next
;
6894 list_for_each_entry_safe(oop
, next
, reaplist
, oo_perclient
) {
6895 list_del_init(&oop
->oo_perclient
);
6896 clp
= oop
->oo_owner
.so_client
;
6897 release_openowner(oop
);
6903 nfsd_inject_forget_client_openowners(struct sockaddr_storage
*addr
,
6906 unsigned int count
= 0;
6907 struct nfs4_client
*clp
;
6908 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6910 LIST_HEAD(reaplist
);
6912 if (!nfsd_netns_ready(nn
))
6915 spin_lock(&nn
->client_lock
);
6916 clp
= nfsd_find_client(addr
, addr_size
);
6918 count
= nfsd_collect_client_openowners(clp
, &reaplist
, 0);
6919 spin_unlock(&nn
->client_lock
);
6920 nfsd_reap_openowners(&reaplist
);
6925 nfsd_inject_forget_openowners(u64 max
)
6928 struct nfs4_client
*clp
;
6929 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6931 LIST_HEAD(reaplist
);
6933 if (!nfsd_netns_ready(nn
))
6936 spin_lock(&nn
->client_lock
);
6937 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6938 count
+= nfsd_collect_client_openowners(clp
, &reaplist
,
6940 if (max
!= 0 && count
>= max
)
6943 spin_unlock(&nn
->client_lock
);
6944 nfsd_reap_openowners(&reaplist
);
6948 static u64
nfsd_find_all_delegations(struct nfs4_client
*clp
, u64 max
,
6949 struct list_head
*victims
)
6951 struct nfs4_delegation
*dp
, *next
;
6952 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6956 lockdep_assert_held(&nn
->client_lock
);
6958 spin_lock(&state_lock
);
6959 list_for_each_entry_safe(dp
, next
, &clp
->cl_delegations
, dl_perclnt
) {
6962 * It's not safe to mess with delegations that have a
6963 * non-zero dl_time. They might have already been broken
6964 * and could be processed by the laundromat outside of
6965 * the state_lock. Just leave them be.
6967 if (dp
->dl_time
!= 0)
6970 atomic_inc(&clp
->cl_refcount
);
6971 WARN_ON(!unhash_delegation_locked(dp
));
6972 list_add(&dp
->dl_recall_lru
, victims
);
6976 * Despite the fact that these functions deal with
6977 * 64-bit integers for "count", we must ensure that
6978 * it doesn't blow up the clp->cl_refcount. Throw a
6979 * warning if we start to approach INT_MAX here.
6981 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6985 spin_unlock(&state_lock
);
6990 nfsd_print_client_delegations(struct nfs4_client
*clp
)
6992 u64 count
= nfsd_find_all_delegations(clp
, 0, NULL
);
6994 nfsd_print_count(clp
, count
, "delegations");
6999 nfsd_inject_print_delegations(void)
7001 struct nfs4_client
*clp
;
7003 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7006 if (!nfsd_netns_ready(nn
))
7009 spin_lock(&nn
->client_lock
);
7010 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
7011 count
+= nfsd_print_client_delegations(clp
);
7012 spin_unlock(&nn
->client_lock
);
7018 nfsd_forget_delegations(struct list_head
*reaplist
)
7020 struct nfs4_client
*clp
;
7021 struct nfs4_delegation
*dp
, *next
;
7023 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
7024 list_del_init(&dp
->dl_recall_lru
);
7025 clp
= dp
->dl_stid
.sc_client
;
7026 revoke_delegation(dp
);
7032 nfsd_inject_forget_client_delegations(struct sockaddr_storage
*addr
,
7036 struct nfs4_client
*clp
;
7037 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7039 LIST_HEAD(reaplist
);
7041 if (!nfsd_netns_ready(nn
))
7044 spin_lock(&nn
->client_lock
);
7045 clp
= nfsd_find_client(addr
, addr_size
);
7047 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
7048 spin_unlock(&nn
->client_lock
);
7050 nfsd_forget_delegations(&reaplist
);
7055 nfsd_inject_forget_delegations(u64 max
)
7058 struct nfs4_client
*clp
;
7059 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7061 LIST_HEAD(reaplist
);
7063 if (!nfsd_netns_ready(nn
))
7066 spin_lock(&nn
->client_lock
);
7067 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
7068 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
7069 if (max
!= 0 && count
>= max
)
7072 spin_unlock(&nn
->client_lock
);
7073 nfsd_forget_delegations(&reaplist
);
7078 nfsd_recall_delegations(struct list_head
*reaplist
)
7080 struct nfs4_client
*clp
;
7081 struct nfs4_delegation
*dp
, *next
;
7083 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
7084 list_del_init(&dp
->dl_recall_lru
);
7085 clp
= dp
->dl_stid
.sc_client
;
7087 * We skipped all entries that had a zero dl_time before,
7088 * so we can now reset the dl_time back to 0. If a delegation
7089 * break comes in now, then it won't make any difference since
7090 * we're recalling it either way.
7092 spin_lock(&state_lock
);
7094 spin_unlock(&state_lock
);
7095 nfsd_break_one_deleg(dp
);
7101 nfsd_inject_recall_client_delegations(struct sockaddr_storage
*addr
,
7105 struct nfs4_client
*clp
;
7106 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7108 LIST_HEAD(reaplist
);
7110 if (!nfsd_netns_ready(nn
))
7113 spin_lock(&nn
->client_lock
);
7114 clp
= nfsd_find_client(addr
, addr_size
);
7116 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
7117 spin_unlock(&nn
->client_lock
);
7119 nfsd_recall_delegations(&reaplist
);
7124 nfsd_inject_recall_delegations(u64 max
)
7127 struct nfs4_client
*clp
, *next
;
7128 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7130 LIST_HEAD(reaplist
);
7132 if (!nfsd_netns_ready(nn
))
7135 spin_lock(&nn
->client_lock
);
7136 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
7137 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
7138 if (max
!= 0 && ++count
>= max
)
7141 spin_unlock(&nn
->client_lock
);
7142 nfsd_recall_delegations(&reaplist
);
7145 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7148 * Since the lifetime of a delegation isn't limited to that of an open, a
7149 * client may quite reasonably hang on to a delegation as long as it has
7150 * the inode cached. This becomes an obvious problem the first time a
7151 * client's inode cache approaches the size of the server's total memory.
7153 * For now we avoid this problem by imposing a hard limit on the number
7154 * of delegations, which varies according to the server's memory size.
7157 set_max_delegations(void)
7160 * Allow at most 4 delegations per megabyte of RAM. Quick
7161 * estimates suggest that in the worst case (where every delegation
7162 * is for a different inode), a delegation could take about 1.5K,
7163 * giving a worst case usage of about 6% of memory.
7165 max_delegations
= nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT
);
7168 static int nfs4_state_create_net(struct net
*net
)
7170 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7173 nn
->conf_id_hashtbl
= kmalloc_array(CLIENT_HASH_SIZE
,
7174 sizeof(struct list_head
),
7176 if (!nn
->conf_id_hashtbl
)
7178 nn
->unconf_id_hashtbl
= kmalloc_array(CLIENT_HASH_SIZE
,
7179 sizeof(struct list_head
),
7181 if (!nn
->unconf_id_hashtbl
)
7183 nn
->sessionid_hashtbl
= kmalloc_array(SESSION_HASH_SIZE
,
7184 sizeof(struct list_head
),
7186 if (!nn
->sessionid_hashtbl
)
7189 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7190 INIT_LIST_HEAD(&nn
->conf_id_hashtbl
[i
]);
7191 INIT_LIST_HEAD(&nn
->unconf_id_hashtbl
[i
]);
7193 for (i
= 0; i
< SESSION_HASH_SIZE
; i
++)
7194 INIT_LIST_HEAD(&nn
->sessionid_hashtbl
[i
]);
7195 nn
->conf_name_tree
= RB_ROOT
;
7196 nn
->unconf_name_tree
= RB_ROOT
;
7197 nn
->boot_time
= get_seconds();
7198 nn
->grace_ended
= false;
7199 nn
->nfsd4_manager
.block_opens
= true;
7200 INIT_LIST_HEAD(&nn
->nfsd4_manager
.list
);
7201 INIT_LIST_HEAD(&nn
->client_lru
);
7202 INIT_LIST_HEAD(&nn
->close_lru
);
7203 INIT_LIST_HEAD(&nn
->del_recall_lru
);
7204 spin_lock_init(&nn
->client_lock
);
7205 spin_lock_init(&nn
->s2s_cp_lock
);
7206 idr_init(&nn
->s2s_cp_stateids
);
7208 spin_lock_init(&nn
->blocked_locks_lock
);
7209 INIT_LIST_HEAD(&nn
->blocked_locks_lru
);
7211 INIT_DELAYED_WORK(&nn
->laundromat_work
, laundromat_main
);
7217 kfree(nn
->unconf_id_hashtbl
);
7219 kfree(nn
->conf_id_hashtbl
);
7225 nfs4_state_destroy_net(struct net
*net
)
7228 struct nfs4_client
*clp
= NULL
;
7229 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7231 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7232 while (!list_empty(&nn
->conf_id_hashtbl
[i
])) {
7233 clp
= list_entry(nn
->conf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
7234 destroy_client(clp
);
7238 WARN_ON(!list_empty(&nn
->blocked_locks_lru
));
7240 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7241 while (!list_empty(&nn
->unconf_id_hashtbl
[i
])) {
7242 clp
= list_entry(nn
->unconf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
7243 destroy_client(clp
);
7247 kfree(nn
->sessionid_hashtbl
);
7248 kfree(nn
->unconf_id_hashtbl
);
7249 kfree(nn
->conf_id_hashtbl
);
7254 nfs4_state_start_net(struct net
*net
)
7256 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7259 ret
= nfs4_state_create_net(net
);
7262 locks_start_grace(net
, &nn
->nfsd4_manager
);
7263 nfsd4_client_tracking_init(net
);
7264 printk(KERN_INFO
"NFSD: starting %ld-second grace period (net %x)\n",
7265 nn
->nfsd4_grace
, net
->ns
.inum
);
7266 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, nn
->nfsd4_grace
* HZ
);
7270 /* initialization to perform when the nfsd service is started: */
7273 nfs4_state_start(void)
7277 laundry_wq
= alloc_workqueue("%s", WQ_UNBOUND
, 0, "nfsd4");
7278 if (laundry_wq
== NULL
) {
7282 ret
= nfsd4_create_callback_queue();
7284 goto out_free_laundry
;
7286 set_max_delegations();
7290 destroy_workqueue(laundry_wq
);
7296 nfs4_state_shutdown_net(struct net
*net
)
7298 struct nfs4_delegation
*dp
= NULL
;
7299 struct list_head
*pos
, *next
, reaplist
;
7300 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7302 cancel_delayed_work_sync(&nn
->laundromat_work
);
7303 locks_end_grace(&nn
->nfsd4_manager
);
7305 INIT_LIST_HEAD(&reaplist
);
7306 spin_lock(&state_lock
);
7307 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
7308 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
7309 WARN_ON(!unhash_delegation_locked(dp
));
7310 list_add(&dp
->dl_recall_lru
, &reaplist
);
7312 spin_unlock(&state_lock
);
7313 list_for_each_safe(pos
, next
, &reaplist
) {
7314 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
7315 list_del_init(&dp
->dl_recall_lru
);
7316 destroy_unhashed_deleg(dp
);
7319 nfsd4_client_tracking_exit(net
);
7320 nfs4_state_destroy_net(net
);
7324 nfs4_state_shutdown(void)
7326 destroy_workqueue(laundry_wq
);
7327 nfsd4_destroy_callback_queue();
7331 get_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
7333 if (HAS_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
) && CURRENT_STATEID(stateid
))
7334 memcpy(stateid
, &cstate
->current_stateid
, sizeof(stateid_t
));
7338 put_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
7340 if (cstate
->minorversion
) {
7341 memcpy(&cstate
->current_stateid
, stateid
, sizeof(stateid_t
));
7342 SET_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
7347 clear_current_stateid(struct nfsd4_compound_state
*cstate
)
7349 CLEAR_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
7353 * functions to set current state id
7356 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state
*cstate
,
7357 union nfsd4_op_u
*u
)
7359 put_stateid(cstate
, &u
->open_downgrade
.od_stateid
);
7363 nfsd4_set_openstateid(struct nfsd4_compound_state
*cstate
,
7364 union nfsd4_op_u
*u
)
7366 put_stateid(cstate
, &u
->open
.op_stateid
);
7370 nfsd4_set_closestateid(struct nfsd4_compound_state
*cstate
,
7371 union nfsd4_op_u
*u
)
7373 put_stateid(cstate
, &u
->close
.cl_stateid
);
7377 nfsd4_set_lockstateid(struct nfsd4_compound_state
*cstate
,
7378 union nfsd4_op_u
*u
)
7380 put_stateid(cstate
, &u
->lock
.lk_resp_stateid
);
7384 * functions to consume current state id
7388 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state
*cstate
,
7389 union nfsd4_op_u
*u
)
7391 get_stateid(cstate
, &u
->open_downgrade
.od_stateid
);
7395 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state
*cstate
,
7396 union nfsd4_op_u
*u
)
7398 get_stateid(cstate
, &u
->delegreturn
.dr_stateid
);
7402 nfsd4_get_freestateid(struct nfsd4_compound_state
*cstate
,
7403 union nfsd4_op_u
*u
)
7405 get_stateid(cstate
, &u
->free_stateid
.fr_stateid
);
7409 nfsd4_get_setattrstateid(struct nfsd4_compound_state
*cstate
,
7410 union nfsd4_op_u
*u
)
7412 get_stateid(cstate
, &u
->setattr
.sa_stateid
);
7416 nfsd4_get_closestateid(struct nfsd4_compound_state
*cstate
,
7417 union nfsd4_op_u
*u
)
7419 get_stateid(cstate
, &u
->close
.cl_stateid
);
7423 nfsd4_get_lockustateid(struct nfsd4_compound_state
*cstate
,
7424 union nfsd4_op_u
*u
)
7426 get_stateid(cstate
, &u
->locku
.lu_stateid
);
7430 nfsd4_get_readstateid(struct nfsd4_compound_state
*cstate
,
7431 union nfsd4_op_u
*u
)
7433 get_stateid(cstate
, &u
->read
.rd_stateid
);
7437 nfsd4_get_writestateid(struct nfsd4_compound_state
*cstate
,
7438 union nfsd4_op_u
*u
)
7440 get_stateid(cstate
, &u
->write
.wr_stateid
);