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 */
2590 status
= nfserr_encr_alg_unsupp
;
2594 /* Cases below refer to rfc 5661 section 18.35.4: */
2595 spin_lock(&nn
->client_lock
);
2596 conf
= find_confirmed_client_by_name(&exid
->clname
, nn
);
2598 bool creds_match
= same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
);
2599 bool verfs_match
= same_verf(&verf
, &conf
->cl_verifier
);
2602 if (!clp_used_exchangeid(conf
)) { /* buggy client */
2603 status
= nfserr_inval
;
2606 if (!nfsd4_mach_creds_match(conf
, rqstp
)) {
2607 status
= nfserr_wrong_cred
;
2610 if (!creds_match
) { /* case 9 */
2611 status
= nfserr_perm
;
2614 if (!verfs_match
) { /* case 8 */
2615 status
= nfserr_not_same
;
2619 exid
->flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2622 if (!creds_match
) { /* case 3 */
2623 if (client_has_state(conf
)) {
2624 status
= nfserr_clid_inuse
;
2629 if (verfs_match
) { /* case 2 */
2630 conf
->cl_exchange_flags
|= EXCHGID4_FLAG_CONFIRMED_R
;
2633 /* case 5, client reboot */
2638 if (update
) { /* case 7 */
2639 status
= nfserr_noent
;
2643 unconf
= find_unconfirmed_client_by_name(&exid
->clname
, nn
);
2644 if (unconf
) /* case 4, possible retry or client restart */
2645 unhash_client_locked(unconf
);
2647 /* case 1 (normal case) */
2650 status
= mark_client_expired_locked(conf
);
2654 new->cl_minorversion
= cstate
->minorversion
;
2655 new->cl_spo_must_allow
.u
.words
[0] = exid
->spo_must_allow
[0];
2656 new->cl_spo_must_allow
.u
.words
[1] = exid
->spo_must_allow
[1];
2659 add_to_unconfirmed(new);
2662 exid
->clientid
.cl_boot
= conf
->cl_clientid
.cl_boot
;
2663 exid
->clientid
.cl_id
= conf
->cl_clientid
.cl_id
;
2665 exid
->seqid
= conf
->cl_cs_slot
.sl_seqid
+ 1;
2666 nfsd4_set_ex_flags(conf
, exid
);
2668 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2669 conf
->cl_cs_slot
.sl_seqid
, conf
->cl_exchange_flags
);
2673 spin_unlock(&nn
->client_lock
);
2678 expire_client(unconf
);
2683 check_slot_seqid(u32 seqid
, u32 slot_seqid
, int slot_inuse
)
2685 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__
, seqid
,
2688 /* The slot is in use, and no response has been sent. */
2690 if (seqid
== slot_seqid
)
2691 return nfserr_jukebox
;
2693 return nfserr_seq_misordered
;
2695 /* Note unsigned 32-bit arithmetic handles wraparound: */
2696 if (likely(seqid
== slot_seqid
+ 1))
2698 if (seqid
== slot_seqid
)
2699 return nfserr_replay_cache
;
2700 return nfserr_seq_misordered
;
2704 * Cache the create session result into the create session single DRC
2705 * slot cache by saving the xdr structure. sl_seqid has been set.
2706 * Do this for solo or embedded create session operations.
2709 nfsd4_cache_create_session(struct nfsd4_create_session
*cr_ses
,
2710 struct nfsd4_clid_slot
*slot
, __be32 nfserr
)
2712 slot
->sl_status
= nfserr
;
2713 memcpy(&slot
->sl_cr_ses
, cr_ses
, sizeof(*cr_ses
));
2717 nfsd4_replay_create_session(struct nfsd4_create_session
*cr_ses
,
2718 struct nfsd4_clid_slot
*slot
)
2720 memcpy(cr_ses
, &slot
->sl_cr_ses
, sizeof(*cr_ses
));
2721 return slot
->sl_status
;
2724 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2725 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2726 1 + /* MIN tag is length with zero, only length */ \
2727 3 + /* version, opcount, opcode */ \
2728 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2729 /* seqid, slotID, slotID, cache */ \
2730 4 ) * sizeof(__be32))
2732 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2733 2 + /* verifier: AUTH_NULL, length 0 */\
2735 1 + /* MIN tag is length with zero, only length */ \
2736 3 + /* opcount, opcode, opstatus*/ \
2737 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2738 /* seqid, slotID, slotID, slotID, status */ \
2739 5 ) * sizeof(__be32))
2741 static __be32
check_forechannel_attrs(struct nfsd4_channel_attrs
*ca
, struct nfsd_net
*nn
)
2743 u32 maxrpc
= nn
->nfsd_serv
->sv_max_mesg
;
2745 if (ca
->maxreq_sz
< NFSD_MIN_REQ_HDR_SEQ_SZ
)
2746 return nfserr_toosmall
;
2747 if (ca
->maxresp_sz
< NFSD_MIN_RESP_HDR_SEQ_SZ
)
2748 return nfserr_toosmall
;
2749 ca
->headerpadsz
= 0;
2750 ca
->maxreq_sz
= min_t(u32
, ca
->maxreq_sz
, maxrpc
);
2751 ca
->maxresp_sz
= min_t(u32
, ca
->maxresp_sz
, maxrpc
);
2752 ca
->maxops
= min_t(u32
, ca
->maxops
, NFSD_MAX_OPS_PER_COMPOUND
);
2753 ca
->maxresp_cached
= min_t(u32
, ca
->maxresp_cached
,
2754 NFSD_SLOT_CACHE_SIZE
+ NFSD_MIN_HDR_SEQ_SZ
);
2755 ca
->maxreqs
= min_t(u32
, ca
->maxreqs
, NFSD_MAX_SLOTS_PER_SESSION
);
2757 * Note decreasing slot size below client's request may make it
2758 * difficult for client to function correctly, whereas
2759 * decreasing the number of slots will (just?) affect
2760 * performance. When short on memory we therefore prefer to
2761 * decrease number of slots instead of their size. Clients that
2762 * request larger slots than they need will get poor results:
2764 ca
->maxreqs
= nfsd4_get_drc_mem(ca
);
2766 return nfserr_jukebox
;
2772 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2773 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2775 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2776 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2778 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2779 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2781 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2782 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2783 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2784 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2787 static __be32
check_backchannel_attrs(struct nfsd4_channel_attrs
*ca
)
2789 ca
->headerpadsz
= 0;
2791 if (ca
->maxreq_sz
< NFSD_CB_MAX_REQ_SZ
)
2792 return nfserr_toosmall
;
2793 if (ca
->maxresp_sz
< NFSD_CB_MAX_RESP_SZ
)
2794 return nfserr_toosmall
;
2795 ca
->maxresp_cached
= 0;
2797 return nfserr_toosmall
;
2802 static __be32
nfsd4_check_cb_sec(struct nfsd4_cb_sec
*cbs
)
2804 switch (cbs
->flavor
) {
2810 * GSS case: the spec doesn't allow us to return this
2811 * error. But it also doesn't allow us not to support
2813 * I'd rather this fail hard than return some error the
2814 * client might think it can already handle:
2816 return nfserr_encr_alg_unsupp
;
2821 nfsd4_create_session(struct svc_rqst
*rqstp
,
2822 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
2824 struct nfsd4_create_session
*cr_ses
= &u
->create_session
;
2825 struct sockaddr
*sa
= svc_addr(rqstp
);
2826 struct nfs4_client
*conf
, *unconf
;
2827 struct nfs4_client
*old
= NULL
;
2828 struct nfsd4_session
*new;
2829 struct nfsd4_conn
*conn
;
2830 struct nfsd4_clid_slot
*cs_slot
= NULL
;
2832 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2834 if (cr_ses
->flags
& ~SESSION4_FLAG_MASK_A
)
2835 return nfserr_inval
;
2836 status
= nfsd4_check_cb_sec(&cr_ses
->cb_sec
);
2839 status
= check_forechannel_attrs(&cr_ses
->fore_channel
, nn
);
2842 status
= check_backchannel_attrs(&cr_ses
->back_channel
);
2844 goto out_release_drc_mem
;
2845 status
= nfserr_jukebox
;
2846 new = alloc_session(&cr_ses
->fore_channel
, &cr_ses
->back_channel
);
2848 goto out_release_drc_mem
;
2849 conn
= alloc_conn_from_crses(rqstp
, cr_ses
);
2851 goto out_free_session
;
2853 spin_lock(&nn
->client_lock
);
2854 unconf
= find_unconfirmed_client(&cr_ses
->clientid
, true, nn
);
2855 conf
= find_confirmed_client(&cr_ses
->clientid
, true, nn
);
2856 WARN_ON_ONCE(conf
&& unconf
);
2859 status
= nfserr_wrong_cred
;
2860 if (!nfsd4_mach_creds_match(conf
, rqstp
))
2862 cs_slot
= &conf
->cl_cs_slot
;
2863 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2865 if (status
== nfserr_replay_cache
)
2866 status
= nfsd4_replay_create_session(cr_ses
, cs_slot
);
2869 } else if (unconf
) {
2870 if (!same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
) ||
2871 !rpc_cmp_addr(sa
, (struct sockaddr
*) &unconf
->cl_addr
)) {
2872 status
= nfserr_clid_inuse
;
2875 status
= nfserr_wrong_cred
;
2876 if (!nfsd4_mach_creds_match(unconf
, rqstp
))
2878 cs_slot
= &unconf
->cl_cs_slot
;
2879 status
= check_slot_seqid(cr_ses
->seqid
, cs_slot
->sl_seqid
, 0);
2881 /* an unconfirmed replay returns misordered */
2882 status
= nfserr_seq_misordered
;
2885 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
2887 status
= mark_client_expired_locked(old
);
2893 move_to_confirmed(unconf
);
2896 status
= nfserr_stale_clientid
;
2900 /* Persistent sessions are not supported */
2901 cr_ses
->flags
&= ~SESSION4_PERSIST
;
2902 /* Upshifting from TCP to RDMA is not supported */
2903 cr_ses
->flags
&= ~SESSION4_RDMA
;
2905 init_session(rqstp
, new, conf
, cr_ses
);
2906 nfsd4_get_session_locked(new);
2908 memcpy(cr_ses
->sessionid
.data
, new->se_sessionid
.data
,
2909 NFS4_MAX_SESSIONID_LEN
);
2910 cs_slot
->sl_seqid
++;
2911 cr_ses
->seqid
= cs_slot
->sl_seqid
;
2913 /* cache solo and embedded create sessions under the client_lock */
2914 nfsd4_cache_create_session(cr_ses
, cs_slot
, status
);
2915 spin_unlock(&nn
->client_lock
);
2916 /* init connection and backchannel */
2917 nfsd4_init_conn(rqstp
, conn
, new);
2918 nfsd4_put_session(new);
2923 spin_unlock(&nn
->client_lock
);
2928 __free_session(new);
2929 out_release_drc_mem
:
2930 nfsd4_put_drc_mem(&cr_ses
->fore_channel
);
2934 static __be32
nfsd4_map_bcts_dir(u32
*dir
)
2937 case NFS4_CDFC4_FORE
:
2938 case NFS4_CDFC4_BACK
:
2940 case NFS4_CDFC4_FORE_OR_BOTH
:
2941 case NFS4_CDFC4_BACK_OR_BOTH
:
2942 *dir
= NFS4_CDFC4_BOTH
;
2945 return nfserr_inval
;
2948 __be32
nfsd4_backchannel_ctl(struct svc_rqst
*rqstp
,
2949 struct nfsd4_compound_state
*cstate
,
2950 union nfsd4_op_u
*u
)
2952 struct nfsd4_backchannel_ctl
*bc
= &u
->backchannel_ctl
;
2953 struct nfsd4_session
*session
= cstate
->session
;
2954 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
2957 status
= nfsd4_check_cb_sec(&bc
->bc_cb_sec
);
2960 spin_lock(&nn
->client_lock
);
2961 session
->se_cb_prog
= bc
->bc_cb_program
;
2962 session
->se_cb_sec
= bc
->bc_cb_sec
;
2963 spin_unlock(&nn
->client_lock
);
2965 nfsd4_probe_callback(session
->se_client
);
2970 __be32
nfsd4_bind_conn_to_session(struct svc_rqst
*rqstp
,
2971 struct nfsd4_compound_state
*cstate
,
2972 union nfsd4_op_u
*u
)
2974 struct nfsd4_bind_conn_to_session
*bcts
= &u
->bind_conn_to_session
;
2976 struct nfsd4_conn
*conn
;
2977 struct nfsd4_session
*session
;
2978 struct net
*net
= SVC_NET(rqstp
);
2979 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
2981 if (!nfsd4_last_compound_op(rqstp
))
2982 return nfserr_not_only_op
;
2983 spin_lock(&nn
->client_lock
);
2984 session
= find_in_sessionid_hashtbl(&bcts
->sessionid
, net
, &status
);
2985 spin_unlock(&nn
->client_lock
);
2987 goto out_no_session
;
2988 status
= nfserr_wrong_cred
;
2989 if (!nfsd4_mach_creds_match(session
->se_client
, rqstp
))
2991 status
= nfsd4_map_bcts_dir(&bcts
->dir
);
2994 conn
= alloc_conn(rqstp
, bcts
->dir
);
2995 status
= nfserr_jukebox
;
2998 nfsd4_init_conn(rqstp
, conn
, session
);
3001 nfsd4_put_session(session
);
3006 static bool nfsd4_compound_in_session(struct nfsd4_compound_state
*cstate
, struct nfs4_sessionid
*sid
)
3008 if (!cstate
->session
)
3010 return !memcmp(sid
, &cstate
->session
->se_sessionid
, sizeof(*sid
));
3014 nfsd4_destroy_session(struct svc_rqst
*r
, struct nfsd4_compound_state
*cstate
,
3015 union nfsd4_op_u
*u
)
3017 struct nfs4_sessionid
*sessionid
= &u
->destroy_session
.sessionid
;
3018 struct nfsd4_session
*ses
;
3020 int ref_held_by_me
= 0;
3021 struct net
*net
= SVC_NET(r
);
3022 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
3024 status
= nfserr_not_only_op
;
3025 if (nfsd4_compound_in_session(cstate
, sessionid
)) {
3026 if (!nfsd4_last_compound_op(r
))
3030 dump_sessionid(__func__
, sessionid
);
3031 spin_lock(&nn
->client_lock
);
3032 ses
= find_in_sessionid_hashtbl(sessionid
, net
, &status
);
3034 goto out_client_lock
;
3035 status
= nfserr_wrong_cred
;
3036 if (!nfsd4_mach_creds_match(ses
->se_client
, r
))
3037 goto out_put_session
;
3038 status
= mark_session_dead_locked(ses
, 1 + ref_held_by_me
);
3040 goto out_put_session
;
3041 unhash_session(ses
);
3042 spin_unlock(&nn
->client_lock
);
3044 nfsd4_probe_callback_sync(ses
->se_client
);
3046 spin_lock(&nn
->client_lock
);
3049 nfsd4_put_session_locked(ses
);
3051 spin_unlock(&nn
->client_lock
);
3056 static struct nfsd4_conn
*__nfsd4_find_conn(struct svc_xprt
*xpt
, struct nfsd4_session
*s
)
3058 struct nfsd4_conn
*c
;
3060 list_for_each_entry(c
, &s
->se_conns
, cn_persession
) {
3061 if (c
->cn_xprt
== xpt
) {
3068 static __be32
nfsd4_sequence_check_conn(struct nfsd4_conn
*new, struct nfsd4_session
*ses
)
3070 struct nfs4_client
*clp
= ses
->se_client
;
3071 struct nfsd4_conn
*c
;
3072 __be32 status
= nfs_ok
;
3075 spin_lock(&clp
->cl_lock
);
3076 c
= __nfsd4_find_conn(new->cn_xprt
, ses
);
3079 status
= nfserr_conn_not_bound_to_session
;
3080 if (clp
->cl_mach_cred
)
3082 __nfsd4_hash_conn(new, ses
);
3083 spin_unlock(&clp
->cl_lock
);
3084 ret
= nfsd4_register_conn(new);
3086 /* oops; xprt is already down: */
3087 nfsd4_conn_lost(&new->cn_xpt_user
);
3090 spin_unlock(&clp
->cl_lock
);
3095 static bool nfsd4_session_too_many_ops(struct svc_rqst
*rqstp
, struct nfsd4_session
*session
)
3097 struct nfsd4_compoundargs
*args
= rqstp
->rq_argp
;
3099 return args
->opcnt
> session
->se_fchannel
.maxops
;
3102 static bool nfsd4_request_too_big(struct svc_rqst
*rqstp
,
3103 struct nfsd4_session
*session
)
3105 struct xdr_buf
*xb
= &rqstp
->rq_arg
;
3107 return xb
->len
> session
->se_fchannel
.maxreq_sz
;
3110 static bool replay_matches_cache(struct svc_rqst
*rqstp
,
3111 struct nfsd4_sequence
*seq
, struct nfsd4_slot
*slot
)
3113 struct nfsd4_compoundargs
*argp
= rqstp
->rq_argp
;
3115 if ((bool)(slot
->sl_flags
& NFSD4_SLOT_CACHETHIS
) !=
3116 (bool)seq
->cachethis
)
3119 * If there's an error than the reply can have fewer ops than
3120 * the call. But if we cached a reply with *more* ops than the
3121 * call you're sending us now, then this new call is clearly not
3122 * really a replay of the old one:
3124 if (slot
->sl_opcnt
< argp
->opcnt
)
3126 /* This is the only check explicitly called by spec: */
3127 if (!same_creds(&rqstp
->rq_cred
, &slot
->sl_cred
))
3130 * There may be more comparisons we could actually do, but the
3131 * spec doesn't require us to catch every case where the calls
3132 * don't match (that would require caching the call as well as
3133 * the reply), so we don't bother.
3139 nfsd4_sequence(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3140 union nfsd4_op_u
*u
)
3142 struct nfsd4_sequence
*seq
= &u
->sequence
;
3143 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
3144 struct xdr_stream
*xdr
= &resp
->xdr
;
3145 struct nfsd4_session
*session
;
3146 struct nfs4_client
*clp
;
3147 struct nfsd4_slot
*slot
;
3148 struct nfsd4_conn
*conn
;
3151 struct net
*net
= SVC_NET(rqstp
);
3152 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
3154 if (resp
->opcnt
!= 1)
3155 return nfserr_sequence_pos
;
3158 * Will be either used or freed by nfsd4_sequence_check_conn
3161 conn
= alloc_conn(rqstp
, NFS4_CDFC4_FORE
);
3163 return nfserr_jukebox
;
3165 spin_lock(&nn
->client_lock
);
3166 session
= find_in_sessionid_hashtbl(&seq
->sessionid
, net
, &status
);
3168 goto out_no_session
;
3169 clp
= session
->se_client
;
3171 status
= nfserr_too_many_ops
;
3172 if (nfsd4_session_too_many_ops(rqstp
, session
))
3173 goto out_put_session
;
3175 status
= nfserr_req_too_big
;
3176 if (nfsd4_request_too_big(rqstp
, session
))
3177 goto out_put_session
;
3179 status
= nfserr_badslot
;
3180 if (seq
->slotid
>= session
->se_fchannel
.maxreqs
)
3181 goto out_put_session
;
3183 slot
= session
->se_slots
[seq
->slotid
];
3184 dprintk("%s: slotid %d\n", __func__
, seq
->slotid
);
3186 /* We do not negotiate the number of slots yet, so set the
3187 * maxslots to the session maxreqs which is used to encode
3188 * sr_highest_slotid and the sr_target_slot id to maxslots */
3189 seq
->maxslots
= session
->se_fchannel
.maxreqs
;
3191 status
= check_slot_seqid(seq
->seqid
, slot
->sl_seqid
,
3192 slot
->sl_flags
& NFSD4_SLOT_INUSE
);
3193 if (status
== nfserr_replay_cache
) {
3194 status
= nfserr_seq_misordered
;
3195 if (!(slot
->sl_flags
& NFSD4_SLOT_INITIALIZED
))
3196 goto out_put_session
;
3197 status
= nfserr_seq_false_retry
;
3198 if (!replay_matches_cache(rqstp
, seq
, slot
))
3199 goto out_put_session
;
3200 cstate
->slot
= slot
;
3201 cstate
->session
= session
;
3203 /* Return the cached reply status and set cstate->status
3204 * for nfsd4_proc_compound processing */
3205 status
= nfsd4_replay_cache_entry(resp
, seq
);
3206 cstate
->status
= nfserr_replay_cache
;
3210 goto out_put_session
;
3212 status
= nfsd4_sequence_check_conn(conn
, session
);
3215 goto out_put_session
;
3217 buflen
= (seq
->cachethis
) ?
3218 session
->se_fchannel
.maxresp_cached
:
3219 session
->se_fchannel
.maxresp_sz
;
3220 status
= (seq
->cachethis
) ? nfserr_rep_too_big_to_cache
:
3222 if (xdr_restrict_buflen(xdr
, buflen
- rqstp
->rq_auth_slack
))
3223 goto out_put_session
;
3224 svc_reserve(rqstp
, buflen
);
3227 /* Success! bump slot seqid */
3228 slot
->sl_seqid
= seq
->seqid
;
3229 slot
->sl_flags
|= NFSD4_SLOT_INUSE
;
3231 slot
->sl_flags
|= NFSD4_SLOT_CACHETHIS
;
3233 slot
->sl_flags
&= ~NFSD4_SLOT_CACHETHIS
;
3235 cstate
->slot
= slot
;
3236 cstate
->session
= session
;
3240 switch (clp
->cl_cb_state
) {
3242 seq
->status_flags
= SEQ4_STATUS_CB_PATH_DOWN
;
3244 case NFSD4_CB_FAULT
:
3245 seq
->status_flags
= SEQ4_STATUS_BACKCHANNEL_FAULT
;
3248 seq
->status_flags
= 0;
3250 if (!list_empty(&clp
->cl_revoked
))
3251 seq
->status_flags
|= SEQ4_STATUS_RECALLABLE_STATE_REVOKED
;
3255 spin_unlock(&nn
->client_lock
);
3258 nfsd4_put_session_locked(session
);
3259 goto out_no_session
;
3263 nfsd4_sequence_done(struct nfsd4_compoundres
*resp
)
3265 struct nfsd4_compound_state
*cs
= &resp
->cstate
;
3267 if (nfsd4_has_session(cs
)) {
3268 if (cs
->status
!= nfserr_replay_cache
) {
3269 nfsd4_store_cache_entry(resp
);
3270 cs
->slot
->sl_flags
&= ~NFSD4_SLOT_INUSE
;
3272 /* Drop session reference that was taken in nfsd4_sequence() */
3273 nfsd4_put_session(cs
->session
);
3275 put_client_renew(cs
->clp
);
3279 nfsd4_destroy_clientid(struct svc_rqst
*rqstp
,
3280 struct nfsd4_compound_state
*cstate
,
3281 union nfsd4_op_u
*u
)
3283 struct nfsd4_destroy_clientid
*dc
= &u
->destroy_clientid
;
3284 struct nfs4_client
*conf
, *unconf
;
3285 struct nfs4_client
*clp
= NULL
;
3287 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3289 spin_lock(&nn
->client_lock
);
3290 unconf
= find_unconfirmed_client(&dc
->clientid
, true, nn
);
3291 conf
= find_confirmed_client(&dc
->clientid
, true, nn
);
3292 WARN_ON_ONCE(conf
&& unconf
);
3295 if (client_has_state(conf
)) {
3296 status
= nfserr_clientid_busy
;
3299 status
= mark_client_expired_locked(conf
);
3306 status
= nfserr_stale_clientid
;
3309 if (!nfsd4_mach_creds_match(clp
, rqstp
)) {
3311 status
= nfserr_wrong_cred
;
3314 unhash_client_locked(clp
);
3316 spin_unlock(&nn
->client_lock
);
3323 nfsd4_reclaim_complete(struct svc_rqst
*rqstp
,
3324 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
3326 struct nfsd4_reclaim_complete
*rc
= &u
->reclaim_complete
;
3329 if (rc
->rca_one_fs
) {
3330 if (!cstate
->current_fh
.fh_dentry
)
3331 return nfserr_nofilehandle
;
3333 * We don't take advantage of the rca_one_fs case.
3334 * That's OK, it's optional, we can safely ignore it.
3339 status
= nfserr_complete_already
;
3340 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
,
3341 &cstate
->session
->se_client
->cl_flags
))
3344 status
= nfserr_stale_clientid
;
3345 if (is_client_expired(cstate
->session
->se_client
))
3347 * The following error isn't really legal.
3348 * But we only get here if the client just explicitly
3349 * destroyed the client. Surely it no longer cares what
3350 * error it gets back on an operation for the dead
3356 nfsd4_client_record_create(cstate
->session
->se_client
);
3362 nfsd4_setclientid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
3363 union nfsd4_op_u
*u
)
3365 struct nfsd4_setclientid
*setclid
= &u
->setclientid
;
3366 struct xdr_netobj clname
= setclid
->se_name
;
3367 nfs4_verifier clverifier
= setclid
->se_verf
;
3368 struct nfs4_client
*conf
, *new;
3369 struct nfs4_client
*unconf
= NULL
;
3371 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3373 new = create_client(clname
, rqstp
, &clverifier
);
3375 return nfserr_jukebox
;
3376 /* Cases below refer to rfc 3530 section 14.2.33: */
3377 spin_lock(&nn
->client_lock
);
3378 conf
= find_confirmed_client_by_name(&clname
, nn
);
3379 if (conf
&& client_has_state(conf
)) {
3381 status
= nfserr_clid_inuse
;
3382 if (clp_used_exchangeid(conf
))
3384 if (!same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
)) {
3385 char addr_str
[INET6_ADDRSTRLEN
];
3386 rpc_ntop((struct sockaddr
*) &conf
->cl_addr
, addr_str
,
3388 dprintk("NFSD: setclientid: string in use by client "
3389 "at %s\n", addr_str
);
3393 unconf
= find_unconfirmed_client_by_name(&clname
, nn
);
3395 unhash_client_locked(unconf
);
3396 if (conf
&& same_verf(&conf
->cl_verifier
, &clverifier
)) {
3397 /* case 1: probable callback update */
3398 copy_clid(new, conf
);
3399 gen_confirm(new, nn
);
3400 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3402 new->cl_minorversion
= 0;
3403 gen_callback(new, setclid
, rqstp
);
3404 add_to_unconfirmed(new);
3405 setclid
->se_clientid
.cl_boot
= new->cl_clientid
.cl_boot
;
3406 setclid
->se_clientid
.cl_id
= new->cl_clientid
.cl_id
;
3407 memcpy(setclid
->se_confirm
.data
, new->cl_confirm
.data
, sizeof(setclid
->se_confirm
.data
));
3411 spin_unlock(&nn
->client_lock
);
3415 expire_client(unconf
);
3421 nfsd4_setclientid_confirm(struct svc_rqst
*rqstp
,
3422 struct nfsd4_compound_state
*cstate
,
3423 union nfsd4_op_u
*u
)
3425 struct nfsd4_setclientid_confirm
*setclientid_confirm
=
3426 &u
->setclientid_confirm
;
3427 struct nfs4_client
*conf
, *unconf
;
3428 struct nfs4_client
*old
= NULL
;
3429 nfs4_verifier confirm
= setclientid_confirm
->sc_confirm
;
3430 clientid_t
* clid
= &setclientid_confirm
->sc_clientid
;
3432 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
3434 if (STALE_CLIENTID(clid
, nn
))
3435 return nfserr_stale_clientid
;
3437 spin_lock(&nn
->client_lock
);
3438 conf
= find_confirmed_client(clid
, false, nn
);
3439 unconf
= find_unconfirmed_client(clid
, false, nn
);
3441 * We try hard to give out unique clientid's, so if we get an
3442 * attempt to confirm the same clientid with a different cred,
3443 * the client may be buggy; this should never happen.
3445 * Nevertheless, RFC 7530 recommends INUSE for this case:
3447 status
= nfserr_clid_inuse
;
3448 if (unconf
&& !same_creds(&unconf
->cl_cred
, &rqstp
->rq_cred
))
3450 if (conf
&& !same_creds(&conf
->cl_cred
, &rqstp
->rq_cred
))
3452 /* cases below refer to rfc 3530 section 14.2.34: */
3453 if (!unconf
|| !same_verf(&confirm
, &unconf
->cl_confirm
)) {
3454 if (conf
&& same_verf(&confirm
, &conf
->cl_confirm
)) {
3455 /* case 2: probable retransmit */
3457 } else /* case 4: client hasn't noticed we rebooted yet? */
3458 status
= nfserr_stale_clientid
;
3462 if (conf
) { /* case 1: callback update */
3464 unhash_client_locked(old
);
3465 nfsd4_change_callback(conf
, &unconf
->cl_cb_conn
);
3466 } else { /* case 3: normal case; new or rebooted client */
3467 old
= find_confirmed_client_by_name(&unconf
->cl_name
, nn
);
3469 status
= nfserr_clid_inuse
;
3470 if (client_has_state(old
)
3471 && !same_creds(&unconf
->cl_cred
,
3474 status
= mark_client_expired_locked(old
);
3480 move_to_confirmed(unconf
);
3483 get_client_locked(conf
);
3484 spin_unlock(&nn
->client_lock
);
3485 nfsd4_probe_callback(conf
);
3486 spin_lock(&nn
->client_lock
);
3487 put_client_renew_locked(conf
);
3489 spin_unlock(&nn
->client_lock
);
3495 static struct nfs4_file
*nfsd4_alloc_file(void)
3497 return kmem_cache_alloc(file_slab
, GFP_KERNEL
);
3500 /* OPEN Share state helper functions */
3501 static void nfsd4_init_file(struct knfsd_fh
*fh
, unsigned int hashval
,
3502 struct nfs4_file
*fp
)
3504 lockdep_assert_held(&state_lock
);
3506 refcount_set(&fp
->fi_ref
, 1);
3507 spin_lock_init(&fp
->fi_lock
);
3508 INIT_LIST_HEAD(&fp
->fi_stateids
);
3509 INIT_LIST_HEAD(&fp
->fi_delegations
);
3510 INIT_LIST_HEAD(&fp
->fi_clnt_odstate
);
3511 fh_copy_shallow(&fp
->fi_fhandle
, fh
);
3512 fp
->fi_deleg_file
= NULL
;
3513 fp
->fi_had_conflict
= false;
3514 fp
->fi_share_deny
= 0;
3515 memset(fp
->fi_fds
, 0, sizeof(fp
->fi_fds
));
3516 memset(fp
->fi_access
, 0, sizeof(fp
->fi_access
));
3517 #ifdef CONFIG_NFSD_PNFS
3518 INIT_LIST_HEAD(&fp
->fi_lo_states
);
3519 atomic_set(&fp
->fi_lo_recalls
, 0);
3521 hlist_add_head_rcu(&fp
->fi_hash
, &file_hashtbl
[hashval
]);
3525 nfsd4_free_slabs(void)
3527 kmem_cache_destroy(client_slab
);
3528 kmem_cache_destroy(openowner_slab
);
3529 kmem_cache_destroy(lockowner_slab
);
3530 kmem_cache_destroy(file_slab
);
3531 kmem_cache_destroy(stateid_slab
);
3532 kmem_cache_destroy(deleg_slab
);
3533 kmem_cache_destroy(odstate_slab
);
3537 nfsd4_init_slabs(void)
3539 client_slab
= kmem_cache_create("nfsd4_clients",
3540 sizeof(struct nfs4_client
), 0, 0, NULL
);
3541 if (client_slab
== NULL
)
3543 openowner_slab
= kmem_cache_create("nfsd4_openowners",
3544 sizeof(struct nfs4_openowner
), 0, 0, NULL
);
3545 if (openowner_slab
== NULL
)
3546 goto out_free_client_slab
;
3547 lockowner_slab
= kmem_cache_create("nfsd4_lockowners",
3548 sizeof(struct nfs4_lockowner
), 0, 0, NULL
);
3549 if (lockowner_slab
== NULL
)
3550 goto out_free_openowner_slab
;
3551 file_slab
= kmem_cache_create("nfsd4_files",
3552 sizeof(struct nfs4_file
), 0, 0, NULL
);
3553 if (file_slab
== NULL
)
3554 goto out_free_lockowner_slab
;
3555 stateid_slab
= kmem_cache_create("nfsd4_stateids",
3556 sizeof(struct nfs4_ol_stateid
), 0, 0, NULL
);
3557 if (stateid_slab
== NULL
)
3558 goto out_free_file_slab
;
3559 deleg_slab
= kmem_cache_create("nfsd4_delegations",
3560 sizeof(struct nfs4_delegation
), 0, 0, NULL
);
3561 if (deleg_slab
== NULL
)
3562 goto out_free_stateid_slab
;
3563 odstate_slab
= kmem_cache_create("nfsd4_odstate",
3564 sizeof(struct nfs4_clnt_odstate
), 0, 0, NULL
);
3565 if (odstate_slab
== NULL
)
3566 goto out_free_deleg_slab
;
3569 out_free_deleg_slab
:
3570 kmem_cache_destroy(deleg_slab
);
3571 out_free_stateid_slab
:
3572 kmem_cache_destroy(stateid_slab
);
3574 kmem_cache_destroy(file_slab
);
3575 out_free_lockowner_slab
:
3576 kmem_cache_destroy(lockowner_slab
);
3577 out_free_openowner_slab
:
3578 kmem_cache_destroy(openowner_slab
);
3579 out_free_client_slab
:
3580 kmem_cache_destroy(client_slab
);
3582 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3586 static void init_nfs4_replay(struct nfs4_replay
*rp
)
3588 rp
->rp_status
= nfserr_serverfault
;
3590 rp
->rp_buf
= rp
->rp_ibuf
;
3591 mutex_init(&rp
->rp_mutex
);
3594 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state
*cstate
,
3595 struct nfs4_stateowner
*so
)
3597 if (!nfsd4_has_session(cstate
)) {
3598 mutex_lock(&so
->so_replay
.rp_mutex
);
3599 cstate
->replay_owner
= nfs4_get_stateowner(so
);
3603 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state
*cstate
)
3605 struct nfs4_stateowner
*so
= cstate
->replay_owner
;
3608 cstate
->replay_owner
= NULL
;
3609 mutex_unlock(&so
->so_replay
.rp_mutex
);
3610 nfs4_put_stateowner(so
);
3614 static inline void *alloc_stateowner(struct kmem_cache
*slab
, struct xdr_netobj
*owner
, struct nfs4_client
*clp
)
3616 struct nfs4_stateowner
*sop
;
3618 sop
= kmem_cache_alloc(slab
, GFP_KERNEL
);
3622 sop
->so_owner
.data
= kmemdup(owner
->data
, owner
->len
, GFP_KERNEL
);
3623 if (!sop
->so_owner
.data
) {
3624 kmem_cache_free(slab
, sop
);
3627 sop
->so_owner
.len
= owner
->len
;
3629 INIT_LIST_HEAD(&sop
->so_stateids
);
3630 sop
->so_client
= clp
;
3631 init_nfs4_replay(&sop
->so_replay
);
3632 atomic_set(&sop
->so_count
, 1);
3636 static void hash_openowner(struct nfs4_openowner
*oo
, struct nfs4_client
*clp
, unsigned int strhashval
)
3638 lockdep_assert_held(&clp
->cl_lock
);
3640 list_add(&oo
->oo_owner
.so_strhash
,
3641 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
3642 list_add(&oo
->oo_perclient
, &clp
->cl_openowners
);
3645 static void nfs4_unhash_openowner(struct nfs4_stateowner
*so
)
3647 unhash_openowner_locked(openowner(so
));
3650 static void nfs4_free_openowner(struct nfs4_stateowner
*so
)
3652 struct nfs4_openowner
*oo
= openowner(so
);
3654 kmem_cache_free(openowner_slab
, oo
);
3657 static const struct nfs4_stateowner_operations openowner_ops
= {
3658 .so_unhash
= nfs4_unhash_openowner
,
3659 .so_free
= nfs4_free_openowner
,
3662 static struct nfs4_ol_stateid
*
3663 nfsd4_find_existing_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3665 struct nfs4_ol_stateid
*local
, *ret
= NULL
;
3666 struct nfs4_openowner
*oo
= open
->op_openowner
;
3668 lockdep_assert_held(&fp
->fi_lock
);
3670 list_for_each_entry(local
, &fp
->fi_stateids
, st_perfile
) {
3671 /* ignore lock owners */
3672 if (local
->st_stateowner
->so_is_open_owner
== 0)
3674 if (local
->st_stateowner
!= &oo
->oo_owner
)
3676 if (local
->st_stid
.sc_type
== NFS4_OPEN_STID
) {
3678 refcount_inc(&ret
->st_stid
.sc_count
);
3686 nfsd4_verify_open_stid(struct nfs4_stid
*s
)
3688 __be32 ret
= nfs_ok
;
3690 switch (s
->sc_type
) {
3694 case NFS4_CLOSED_STID
:
3695 case NFS4_CLOSED_DELEG_STID
:
3696 ret
= nfserr_bad_stateid
;
3698 case NFS4_REVOKED_DELEG_STID
:
3699 ret
= nfserr_deleg_revoked
;
3704 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3706 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid
*stp
)
3710 mutex_lock_nested(&stp
->st_mutex
, LOCK_STATEID_MUTEX
);
3711 ret
= nfsd4_verify_open_stid(&stp
->st_stid
);
3713 mutex_unlock(&stp
->st_mutex
);
3717 static struct nfs4_ol_stateid
*
3718 nfsd4_find_and_lock_existing_open(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3720 struct nfs4_ol_stateid
*stp
;
3722 spin_lock(&fp
->fi_lock
);
3723 stp
= nfsd4_find_existing_open(fp
, open
);
3724 spin_unlock(&fp
->fi_lock
);
3725 if (!stp
|| nfsd4_lock_ol_stateid(stp
) == nfs_ok
)
3727 nfs4_put_stid(&stp
->st_stid
);
3732 static struct nfs4_openowner
*
3733 alloc_init_open_stateowner(unsigned int strhashval
, struct nfsd4_open
*open
,
3734 struct nfsd4_compound_state
*cstate
)
3736 struct nfs4_client
*clp
= cstate
->clp
;
3737 struct nfs4_openowner
*oo
, *ret
;
3739 oo
= alloc_stateowner(openowner_slab
, &open
->op_owner
, clp
);
3742 oo
->oo_owner
.so_ops
= &openowner_ops
;
3743 oo
->oo_owner
.so_is_open_owner
= 1;
3744 oo
->oo_owner
.so_seqid
= open
->op_seqid
;
3746 if (nfsd4_has_session(cstate
))
3747 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
3749 oo
->oo_last_closed_stid
= NULL
;
3750 INIT_LIST_HEAD(&oo
->oo_close_lru
);
3751 spin_lock(&clp
->cl_lock
);
3752 ret
= find_openstateowner_str_locked(strhashval
, open
, clp
);
3754 hash_openowner(oo
, clp
, strhashval
);
3757 nfs4_free_stateowner(&oo
->oo_owner
);
3759 spin_unlock(&clp
->cl_lock
);
3763 static struct nfs4_ol_stateid
*
3764 init_open_stateid(struct nfs4_file
*fp
, struct nfsd4_open
*open
)
3767 struct nfs4_openowner
*oo
= open
->op_openowner
;
3768 struct nfs4_ol_stateid
*retstp
= NULL
;
3769 struct nfs4_ol_stateid
*stp
;
3772 /* We are moving these outside of the spinlocks to avoid the warnings */
3773 mutex_init(&stp
->st_mutex
);
3774 mutex_lock_nested(&stp
->st_mutex
, OPEN_STATEID_MUTEX
);
3777 spin_lock(&oo
->oo_owner
.so_client
->cl_lock
);
3778 spin_lock(&fp
->fi_lock
);
3780 retstp
= nfsd4_find_existing_open(fp
, open
);
3784 open
->op_stp
= NULL
;
3785 refcount_inc(&stp
->st_stid
.sc_count
);
3786 stp
->st_stid
.sc_type
= NFS4_OPEN_STID
;
3787 INIT_LIST_HEAD(&stp
->st_locks
);
3788 stp
->st_stateowner
= nfs4_get_stateowner(&oo
->oo_owner
);
3790 stp
->st_stid
.sc_file
= fp
;
3791 stp
->st_access_bmap
= 0;
3792 stp
->st_deny_bmap
= 0;
3793 stp
->st_openstp
= NULL
;
3794 list_add(&stp
->st_perstateowner
, &oo
->oo_owner
.so_stateids
);
3795 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
3798 spin_unlock(&fp
->fi_lock
);
3799 spin_unlock(&oo
->oo_owner
.so_client
->cl_lock
);
3801 /* Handle races with CLOSE */
3802 if (nfsd4_lock_ol_stateid(retstp
) != nfs_ok
) {
3803 nfs4_put_stid(&retstp
->st_stid
);
3806 /* To keep mutex tracking happy */
3807 mutex_unlock(&stp
->st_mutex
);
3814 * In the 4.0 case we need to keep the owners around a little while to handle
3815 * CLOSE replay. We still do need to release any file access that is held by
3816 * them before returning however.
3819 move_to_close_lru(struct nfs4_ol_stateid
*s
, struct net
*net
)
3821 struct nfs4_ol_stateid
*last
;
3822 struct nfs4_openowner
*oo
= openowner(s
->st_stateowner
);
3823 struct nfsd_net
*nn
= net_generic(s
->st_stid
.sc_client
->net
,
3826 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo
);
3829 * We know that we hold one reference via nfsd4_close, and another
3830 * "persistent" reference for the client. If the refcount is higher
3831 * than 2, then there are still calls in progress that are using this
3832 * stateid. We can't put the sc_file reference until they are finished.
3833 * Wait for the refcount to drop to 2. Since it has been unhashed,
3834 * there should be no danger of the refcount going back up again at
3837 wait_event(close_wq
, refcount_read(&s
->st_stid
.sc_count
) == 2);
3839 release_all_access(s
);
3840 if (s
->st_stid
.sc_file
) {
3841 put_nfs4_file(s
->st_stid
.sc_file
);
3842 s
->st_stid
.sc_file
= NULL
;
3845 spin_lock(&nn
->client_lock
);
3846 last
= oo
->oo_last_closed_stid
;
3847 oo
->oo_last_closed_stid
= s
;
3848 list_move_tail(&oo
->oo_close_lru
, &nn
->close_lru
);
3849 oo
->oo_time
= get_seconds();
3850 spin_unlock(&nn
->client_lock
);
3852 nfs4_put_stid(&last
->st_stid
);
3855 /* search file_hashtbl[] for file */
3856 static struct nfs4_file
*
3857 find_file_locked(struct knfsd_fh
*fh
, unsigned int hashval
)
3859 struct nfs4_file
*fp
;
3861 hlist_for_each_entry_rcu(fp
, &file_hashtbl
[hashval
], fi_hash
) {
3862 if (fh_match(&fp
->fi_fhandle
, fh
)) {
3863 if (refcount_inc_not_zero(&fp
->fi_ref
))
3871 find_file(struct knfsd_fh
*fh
)
3873 struct nfs4_file
*fp
;
3874 unsigned int hashval
= file_hashval(fh
);
3877 fp
= find_file_locked(fh
, hashval
);
3882 static struct nfs4_file
*
3883 find_or_add_file(struct nfs4_file
*new, struct knfsd_fh
*fh
)
3885 struct nfs4_file
*fp
;
3886 unsigned int hashval
= file_hashval(fh
);
3889 fp
= find_file_locked(fh
, hashval
);
3894 spin_lock(&state_lock
);
3895 fp
= find_file_locked(fh
, hashval
);
3896 if (likely(fp
== NULL
)) {
3897 nfsd4_init_file(fh
, hashval
, new);
3900 spin_unlock(&state_lock
);
3906 * Called to check deny when READ with all zero stateid or
3907 * WRITE with all zero or all one stateid
3910 nfs4_share_conflict(struct svc_fh
*current_fh
, unsigned int deny_type
)
3912 struct nfs4_file
*fp
;
3913 __be32 ret
= nfs_ok
;
3915 fp
= find_file(¤t_fh
->fh_handle
);
3918 /* Check for conflicting share reservations */
3919 spin_lock(&fp
->fi_lock
);
3920 if (fp
->fi_share_deny
& deny_type
)
3921 ret
= nfserr_locked
;
3922 spin_unlock(&fp
->fi_lock
);
3927 static void nfsd4_cb_recall_prepare(struct nfsd4_callback
*cb
)
3929 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3930 struct nfsd_net
*nn
= net_generic(dp
->dl_stid
.sc_client
->net
,
3933 block_delegations(&dp
->dl_stid
.sc_file
->fi_fhandle
);
3936 * We can't do this in nfsd_break_deleg_cb because it is
3937 * already holding inode->i_lock.
3939 * If the dl_time != 0, then we know that it has already been
3940 * queued for a lease break. Don't queue it again.
3942 spin_lock(&state_lock
);
3943 if (dp
->dl_time
== 0) {
3944 dp
->dl_time
= get_seconds();
3945 list_add_tail(&dp
->dl_recall_lru
, &nn
->del_recall_lru
);
3947 spin_unlock(&state_lock
);
3950 static int nfsd4_cb_recall_done(struct nfsd4_callback
*cb
,
3951 struct rpc_task
*task
)
3953 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3955 if (dp
->dl_stid
.sc_type
== NFS4_CLOSED_DELEG_STID
)
3958 switch (task
->tk_status
) {
3962 case -NFS4ERR_BAD_STATEID
:
3964 * Race: client probably got cb_recall before open reply
3965 * granting delegation.
3967 if (dp
->dl_retries
--) {
3968 rpc_delay(task
, 2 * HZ
);
3977 static void nfsd4_cb_recall_release(struct nfsd4_callback
*cb
)
3979 struct nfs4_delegation
*dp
= cb_to_delegation(cb
);
3981 nfs4_put_stid(&dp
->dl_stid
);
3984 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops
= {
3985 .prepare
= nfsd4_cb_recall_prepare
,
3986 .done
= nfsd4_cb_recall_done
,
3987 .release
= nfsd4_cb_recall_release
,
3990 static void nfsd_break_one_deleg(struct nfs4_delegation
*dp
)
3993 * We're assuming the state code never drops its reference
3994 * without first removing the lease. Since we're in this lease
3995 * callback (and since the lease code is serialized by the
3996 * i_lock) we know the server hasn't removed the lease yet, and
3997 * we know it's safe to take a reference.
3999 refcount_inc(&dp
->dl_stid
.sc_count
);
4000 nfsd4_run_cb(&dp
->dl_recall
);
4003 /* Called from break_lease() with i_lock held. */
4005 nfsd_break_deleg_cb(struct file_lock
*fl
)
4008 struct nfs4_delegation
*dp
= (struct nfs4_delegation
*)fl
->fl_owner
;
4009 struct nfs4_file
*fp
= dp
->dl_stid
.sc_file
;
4012 * We don't want the locks code to timeout the lease for us;
4013 * we'll remove it ourself if a delegation isn't returned
4016 fl
->fl_break_time
= 0;
4018 spin_lock(&fp
->fi_lock
);
4019 fp
->fi_had_conflict
= true;
4020 nfsd_break_one_deleg(dp
);
4021 spin_unlock(&fp
->fi_lock
);
4026 nfsd_change_deleg_cb(struct file_lock
*onlist
, int arg
,
4027 struct list_head
*dispose
)
4030 return lease_modify(onlist
, arg
, dispose
);
4035 static const struct lock_manager_operations nfsd_lease_mng_ops
= {
4036 .lm_break
= nfsd_break_deleg_cb
,
4037 .lm_change
= nfsd_change_deleg_cb
,
4040 static __be32
nfsd4_check_seqid(struct nfsd4_compound_state
*cstate
, struct nfs4_stateowner
*so
, u32 seqid
)
4042 if (nfsd4_has_session(cstate
))
4044 if (seqid
== so
->so_seqid
- 1)
4045 return nfserr_replay_me
;
4046 if (seqid
== so
->so_seqid
)
4048 return nfserr_bad_seqid
;
4051 static __be32
lookup_clientid(clientid_t
*clid
,
4052 struct nfsd4_compound_state
*cstate
,
4053 struct nfsd_net
*nn
)
4055 struct nfs4_client
*found
;
4058 found
= cstate
->clp
;
4059 if (!same_clid(&found
->cl_clientid
, clid
))
4060 return nfserr_stale_clientid
;
4064 if (STALE_CLIENTID(clid
, nn
))
4065 return nfserr_stale_clientid
;
4068 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4069 * cached already then we know this is for is for v4.0 and "sessions"
4072 WARN_ON_ONCE(cstate
->session
);
4073 spin_lock(&nn
->client_lock
);
4074 found
= find_confirmed_client(clid
, false, nn
);
4076 spin_unlock(&nn
->client_lock
);
4077 return nfserr_expired
;
4079 atomic_inc(&found
->cl_refcount
);
4080 spin_unlock(&nn
->client_lock
);
4082 /* Cache the nfs4_client in cstate! */
4083 cstate
->clp
= found
;
4088 nfsd4_process_open1(struct nfsd4_compound_state
*cstate
,
4089 struct nfsd4_open
*open
, struct nfsd_net
*nn
)
4091 clientid_t
*clientid
= &open
->op_clientid
;
4092 struct nfs4_client
*clp
= NULL
;
4093 unsigned int strhashval
;
4094 struct nfs4_openowner
*oo
= NULL
;
4097 if (STALE_CLIENTID(&open
->op_clientid
, nn
))
4098 return nfserr_stale_clientid
;
4100 * In case we need it later, after we've already created the
4101 * file and don't want to risk a further failure:
4103 open
->op_file
= nfsd4_alloc_file();
4104 if (open
->op_file
== NULL
)
4105 return nfserr_jukebox
;
4107 status
= lookup_clientid(clientid
, cstate
, nn
);
4112 strhashval
= ownerstr_hashval(&open
->op_owner
);
4113 oo
= find_openstateowner_str(strhashval
, open
, clp
);
4114 open
->op_openowner
= oo
;
4118 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
4119 /* Replace unconfirmed owners without checking for replay. */
4120 release_openowner(oo
);
4121 open
->op_openowner
= NULL
;
4124 status
= nfsd4_check_seqid(cstate
, &oo
->oo_owner
, open
->op_seqid
);
4129 oo
= alloc_init_open_stateowner(strhashval
, open
, cstate
);
4131 return nfserr_jukebox
;
4132 open
->op_openowner
= oo
;
4134 open
->op_stp
= nfs4_alloc_open_stateid(clp
);
4136 return nfserr_jukebox
;
4138 if (nfsd4_has_session(cstate
) &&
4139 (cstate
->current_fh
.fh_export
->ex_flags
& NFSEXP_PNFS
)) {
4140 open
->op_odstate
= alloc_clnt_odstate(clp
);
4141 if (!open
->op_odstate
)
4142 return nfserr_jukebox
;
4148 static inline __be32
4149 nfs4_check_delegmode(struct nfs4_delegation
*dp
, int flags
)
4151 if ((flags
& WR_STATE
) && (dp
->dl_type
== NFS4_OPEN_DELEGATE_READ
))
4152 return nfserr_openmode
;
4157 static int share_access_to_flags(u32 share_access
)
4159 return share_access
== NFS4_SHARE_ACCESS_READ
? RD_STATE
: WR_STATE
;
4162 static struct nfs4_delegation
*find_deleg_stateid(struct nfs4_client
*cl
, stateid_t
*s
)
4164 struct nfs4_stid
*ret
;
4166 ret
= find_stateid_by_type(cl
, s
,
4167 NFS4_DELEG_STID
|NFS4_REVOKED_DELEG_STID
);
4170 return delegstateid(ret
);
4173 static bool nfsd4_is_deleg_cur(struct nfsd4_open
*open
)
4175 return open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEGATE_CUR
||
4176 open
->op_claim_type
== NFS4_OPEN_CLAIM_DELEG_CUR_FH
;
4180 nfs4_check_deleg(struct nfs4_client
*cl
, struct nfsd4_open
*open
,
4181 struct nfs4_delegation
**dp
)
4184 __be32 status
= nfserr_bad_stateid
;
4185 struct nfs4_delegation
*deleg
;
4187 deleg
= find_deleg_stateid(cl
, &open
->op_delegate_stateid
);
4190 if (deleg
->dl_stid
.sc_type
== NFS4_REVOKED_DELEG_STID
) {
4191 nfs4_put_stid(&deleg
->dl_stid
);
4192 if (cl
->cl_minorversion
)
4193 status
= nfserr_deleg_revoked
;
4196 flags
= share_access_to_flags(open
->op_share_access
);
4197 status
= nfs4_check_delegmode(deleg
, flags
);
4199 nfs4_put_stid(&deleg
->dl_stid
);
4204 if (!nfsd4_is_deleg_cur(open
))
4208 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
4212 static inline int nfs4_access_to_access(u32 nfs4_access
)
4216 if (nfs4_access
& NFS4_SHARE_ACCESS_READ
)
4217 flags
|= NFSD_MAY_READ
;
4218 if (nfs4_access
& NFS4_SHARE_ACCESS_WRITE
)
4219 flags
|= NFSD_MAY_WRITE
;
4223 static inline __be32
4224 nfsd4_truncate(struct svc_rqst
*rqstp
, struct svc_fh
*fh
,
4225 struct nfsd4_open
*open
)
4227 struct iattr iattr
= {
4228 .ia_valid
= ATTR_SIZE
,
4231 if (!open
->op_truncate
)
4233 if (!(open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
))
4234 return nfserr_inval
;
4235 return nfsd_setattr(rqstp
, fh
, &iattr
, 0, (time_t)0);
4238 static __be32
nfs4_get_vfs_file(struct svc_rqst
*rqstp
, struct nfs4_file
*fp
,
4239 struct svc_fh
*cur_fh
, struct nfs4_ol_stateid
*stp
,
4240 struct nfsd4_open
*open
)
4242 struct file
*filp
= NULL
;
4244 int oflag
= nfs4_access_to_omode(open
->op_share_access
);
4245 int access
= nfs4_access_to_access(open
->op_share_access
);
4246 unsigned char old_access_bmap
, old_deny_bmap
;
4248 spin_lock(&fp
->fi_lock
);
4251 * Are we trying to set a deny mode that would conflict with
4254 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
4255 if (status
!= nfs_ok
) {
4256 spin_unlock(&fp
->fi_lock
);
4260 /* set access to the file */
4261 status
= nfs4_file_get_access(fp
, open
->op_share_access
);
4262 if (status
!= nfs_ok
) {
4263 spin_unlock(&fp
->fi_lock
);
4267 /* Set access bits in stateid */
4268 old_access_bmap
= stp
->st_access_bmap
;
4269 set_access(open
->op_share_access
, stp
);
4271 /* Set new deny mask */
4272 old_deny_bmap
= stp
->st_deny_bmap
;
4273 set_deny(open
->op_share_deny
, stp
);
4274 fp
->fi_share_deny
|= (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
4276 if (!fp
->fi_fds
[oflag
]) {
4277 spin_unlock(&fp
->fi_lock
);
4278 status
= nfsd_open(rqstp
, cur_fh
, S_IFREG
, access
, &filp
);
4280 goto out_put_access
;
4281 spin_lock(&fp
->fi_lock
);
4282 if (!fp
->fi_fds
[oflag
]) {
4283 fp
->fi_fds
[oflag
] = filp
;
4287 spin_unlock(&fp
->fi_lock
);
4291 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4293 goto out_put_access
;
4297 stp
->st_access_bmap
= old_access_bmap
;
4298 nfs4_file_put_access(fp
, open
->op_share_access
);
4299 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap
), stp
);
4304 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
)
4307 unsigned char old_deny_bmap
= stp
->st_deny_bmap
;
4309 if (!test_access(open
->op_share_access
, stp
))
4310 return nfs4_get_vfs_file(rqstp
, fp
, cur_fh
, stp
, open
);
4312 /* test and set deny mode */
4313 spin_lock(&fp
->fi_lock
);
4314 status
= nfs4_file_check_deny(fp
, open
->op_share_deny
);
4315 if (status
== nfs_ok
) {
4316 set_deny(open
->op_share_deny
, stp
);
4317 fp
->fi_share_deny
|=
4318 (open
->op_share_deny
& NFS4_SHARE_DENY_BOTH
);
4320 spin_unlock(&fp
->fi_lock
);
4322 if (status
!= nfs_ok
)
4325 status
= nfsd4_truncate(rqstp
, cur_fh
, open
);
4326 if (status
!= nfs_ok
)
4327 reset_union_bmap_deny(old_deny_bmap
, stp
);
4331 /* Should we give out recallable state?: */
4332 static bool nfsd4_cb_channel_good(struct nfs4_client
*clp
)
4334 if (clp
->cl_cb_state
== NFSD4_CB_UP
)
4337 * In the sessions case, since we don't have to establish a
4338 * separate connection for callbacks, we assume it's OK
4339 * until we hear otherwise:
4341 return clp
->cl_minorversion
&& clp
->cl_cb_state
== NFSD4_CB_UNKNOWN
;
4344 static struct file_lock
*nfs4_alloc_init_lease(struct nfs4_delegation
*dp
,
4347 struct file_lock
*fl
;
4349 fl
= locks_alloc_lock();
4352 fl
->fl_lmops
= &nfsd_lease_mng_ops
;
4353 fl
->fl_flags
= FL_DELEG
;
4354 fl
->fl_type
= flag
== NFS4_OPEN_DELEGATE_READ
? F_RDLCK
: F_WRLCK
;
4355 fl
->fl_end
= OFFSET_MAX
;
4356 fl
->fl_owner
= (fl_owner_t
)dp
;
4357 fl
->fl_pid
= current
->tgid
;
4358 fl
->fl_file
= dp
->dl_stid
.sc_file
->fi_deleg_file
;
4362 static struct nfs4_delegation
*
4363 nfs4_set_delegation(struct nfs4_client
*clp
, struct svc_fh
*fh
,
4364 struct nfs4_file
*fp
, struct nfs4_clnt_odstate
*odstate
)
4367 struct nfs4_delegation
*dp
;
4369 struct file_lock
*fl
;
4372 * The fi_had_conflict and nfs_get_existing_delegation checks
4373 * here are just optimizations; we'll need to recheck them at
4376 if (fp
->fi_had_conflict
)
4377 return ERR_PTR(-EAGAIN
);
4379 filp
= find_readable_file(fp
);
4381 /* We should always have a readable file here */
4383 return ERR_PTR(-EBADF
);
4385 spin_lock(&state_lock
);
4386 spin_lock(&fp
->fi_lock
);
4387 if (nfs4_delegation_exists(clp
, fp
))
4389 else if (!fp
->fi_deleg_file
) {
4390 fp
->fi_deleg_file
= filp
;
4391 /* increment early to prevent fi_deleg_file from being
4393 fp
->fi_delegees
= 1;
4397 spin_unlock(&fp
->fi_lock
);
4398 spin_unlock(&state_lock
);
4402 return ERR_PTR(status
);
4405 dp
= alloc_init_deleg(clp
, fp
, fh
, odstate
);
4409 fl
= nfs4_alloc_init_lease(dp
, NFS4_OPEN_DELEGATE_READ
);
4411 goto out_clnt_odstate
;
4413 status
= vfs_setlease(fp
->fi_deleg_file
, fl
->fl_type
, &fl
, NULL
);
4415 locks_free_lock(fl
);
4417 goto out_clnt_odstate
;
4419 spin_lock(&state_lock
);
4420 spin_lock(&fp
->fi_lock
);
4421 if (fp
->fi_had_conflict
)
4424 status
= hash_delegation_locked(dp
, fp
);
4425 spin_unlock(&fp
->fi_lock
);
4426 spin_unlock(&state_lock
);
4433 vfs_setlease(fp
->fi_deleg_file
, F_UNLCK
, NULL
, (void **)&dp
);
4435 put_clnt_odstate(dp
->dl_clnt_odstate
);
4436 nfs4_put_stid(&dp
->dl_stid
);
4439 return ERR_PTR(status
);
4442 static void nfsd4_open_deleg_none_ext(struct nfsd4_open
*open
, int status
)
4444 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4445 if (status
== -EAGAIN
)
4446 open
->op_why_no_deleg
= WND4_CONTENTION
;
4448 open
->op_why_no_deleg
= WND4_RESOURCE
;
4449 switch (open
->op_deleg_want
) {
4450 case NFS4_SHARE_WANT_READ_DELEG
:
4451 case NFS4_SHARE_WANT_WRITE_DELEG
:
4452 case NFS4_SHARE_WANT_ANY_DELEG
:
4454 case NFS4_SHARE_WANT_CANCEL
:
4455 open
->op_why_no_deleg
= WND4_CANCELLED
;
4457 case NFS4_SHARE_WANT_NO_DELEG
:
4464 * Attempt to hand out a delegation.
4466 * Note we don't support write delegations, and won't until the vfs has
4467 * proper support for them.
4470 nfs4_open_delegation(struct svc_fh
*fh
, struct nfsd4_open
*open
,
4471 struct nfs4_ol_stateid
*stp
)
4473 struct nfs4_delegation
*dp
;
4474 struct nfs4_openowner
*oo
= openowner(stp
->st_stateowner
);
4475 struct nfs4_client
*clp
= stp
->st_stid
.sc_client
;
4479 cb_up
= nfsd4_cb_channel_good(oo
->oo_owner
.so_client
);
4480 open
->op_recall
= 0;
4481 switch (open
->op_claim_type
) {
4482 case NFS4_OPEN_CLAIM_PREVIOUS
:
4484 open
->op_recall
= 1;
4485 if (open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_READ
)
4488 case NFS4_OPEN_CLAIM_NULL
:
4489 case NFS4_OPEN_CLAIM_FH
:
4491 * Let's not give out any delegations till everyone's
4492 * had the chance to reclaim theirs, *and* until
4493 * NLM locks have all been reclaimed:
4495 if (locks_in_grace(clp
->net
))
4497 if (!cb_up
|| !(oo
->oo_flags
& NFS4_OO_CONFIRMED
))
4500 * Also, if the file was opened for write or
4501 * create, there's a good chance the client's
4502 * about to write to it, resulting in an
4503 * immediate recall (since we don't support
4504 * write delegations):
4506 if (open
->op_share_access
& NFS4_SHARE_ACCESS_WRITE
)
4508 if (open
->op_create
== NFS4_OPEN_CREATE
)
4514 dp
= nfs4_set_delegation(clp
, fh
, stp
->st_stid
.sc_file
, stp
->st_clnt_odstate
);
4518 memcpy(&open
->op_delegate_stateid
, &dp
->dl_stid
.sc_stateid
, sizeof(dp
->dl_stid
.sc_stateid
));
4520 dprintk("NFSD: delegation stateid=" STATEID_FMT
"\n",
4521 STATEID_VAL(&dp
->dl_stid
.sc_stateid
));
4522 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_READ
;
4523 nfs4_put_stid(&dp
->dl_stid
);
4526 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE
;
4527 if (open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
&&
4528 open
->op_delegate_type
!= NFS4_OPEN_DELEGATE_NONE
) {
4529 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4530 open
->op_recall
= 1;
4533 /* 4.1 client asking for a delegation? */
4534 if (open
->op_deleg_want
)
4535 nfsd4_open_deleg_none_ext(open
, status
);
4539 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open
*open
,
4540 struct nfs4_delegation
*dp
)
4542 if (open
->op_deleg_want
== NFS4_SHARE_WANT_READ_DELEG
&&
4543 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4544 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4545 open
->op_why_no_deleg
= WND4_NOT_SUPP_DOWNGRADE
;
4546 } else if (open
->op_deleg_want
== NFS4_SHARE_WANT_WRITE_DELEG
&&
4547 dp
->dl_type
== NFS4_OPEN_DELEGATE_WRITE
) {
4548 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4549 open
->op_why_no_deleg
= WND4_NOT_SUPP_UPGRADE
;
4551 /* Otherwise the client must be confused wanting a delegation
4552 * it already has, therefore we don't return
4553 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4558 nfsd4_process_open2(struct svc_rqst
*rqstp
, struct svc_fh
*current_fh
, struct nfsd4_open
*open
)
4560 struct nfsd4_compoundres
*resp
= rqstp
->rq_resp
;
4561 struct nfs4_client
*cl
= open
->op_openowner
->oo_owner
.so_client
;
4562 struct nfs4_file
*fp
= NULL
;
4563 struct nfs4_ol_stateid
*stp
= NULL
;
4564 struct nfs4_delegation
*dp
= NULL
;
4566 bool new_stp
= false;
4569 * Lookup file; if found, lookup stateid and check open request,
4570 * and check for delegations in the process of being recalled.
4571 * If not found, create the nfs4_file struct
4573 fp
= find_or_add_file(open
->op_file
, ¤t_fh
->fh_handle
);
4574 if (fp
!= open
->op_file
) {
4575 status
= nfs4_check_deleg(cl
, open
, &dp
);
4578 stp
= nfsd4_find_and_lock_existing_open(fp
, open
);
4580 open
->op_file
= NULL
;
4581 status
= nfserr_bad_stateid
;
4582 if (nfsd4_is_deleg_cur(open
))
4587 stp
= init_open_stateid(fp
, open
);
4593 * OPEN the file, or upgrade an existing OPEN.
4594 * If truncate fails, the OPEN fails.
4596 * stp is already locked.
4599 /* Stateid was found, this is an OPEN upgrade */
4600 status
= nfs4_upgrade_open(rqstp
, fp
, current_fh
, stp
, open
);
4602 mutex_unlock(&stp
->st_mutex
);
4606 status
= nfs4_get_vfs_file(rqstp
, fp
, current_fh
, stp
, open
);
4608 stp
->st_stid
.sc_type
= NFS4_CLOSED_STID
;
4609 release_open_stateid(stp
);
4610 mutex_unlock(&stp
->st_mutex
);
4614 stp
->st_clnt_odstate
= find_or_hash_clnt_odstate(fp
,
4616 if (stp
->st_clnt_odstate
== open
->op_odstate
)
4617 open
->op_odstate
= NULL
;
4620 nfs4_inc_and_copy_stateid(&open
->op_stateid
, &stp
->st_stid
);
4621 mutex_unlock(&stp
->st_mutex
);
4623 if (nfsd4_has_session(&resp
->cstate
)) {
4624 if (open
->op_deleg_want
& NFS4_SHARE_WANT_NO_DELEG
) {
4625 open
->op_delegate_type
= NFS4_OPEN_DELEGATE_NONE_EXT
;
4626 open
->op_why_no_deleg
= WND4_NOT_WANTED
;
4632 * Attempt to hand out a delegation. No error return, because the
4633 * OPEN succeeds even if we fail.
4635 nfs4_open_delegation(current_fh
, open
, stp
);
4639 dprintk("%s: stateid=" STATEID_FMT
"\n", __func__
,
4640 STATEID_VAL(&stp
->st_stid
.sc_stateid
));
4642 /* 4.1 client trying to upgrade/downgrade delegation? */
4643 if (open
->op_delegate_type
== NFS4_OPEN_DELEGATE_NONE
&& dp
&&
4644 open
->op_deleg_want
)
4645 nfsd4_deleg_xgrade_none_ext(open
, dp
);
4649 if (status
== 0 && open
->op_claim_type
== NFS4_OPEN_CLAIM_PREVIOUS
)
4650 open
->op_openowner
->oo_flags
|= NFS4_OO_CONFIRMED
;
4652 * To finish the open response, we just need to set the rflags.
4654 open
->op_rflags
= NFS4_OPEN_RESULT_LOCKTYPE_POSIX
;
4655 if (nfsd4_has_session(&resp
->cstate
))
4656 open
->op_rflags
|= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK
;
4657 else if (!(open
->op_openowner
->oo_flags
& NFS4_OO_CONFIRMED
))
4658 open
->op_rflags
|= NFS4_OPEN_RESULT_CONFIRM
;
4661 nfs4_put_stid(&dp
->dl_stid
);
4663 nfs4_put_stid(&stp
->st_stid
);
4668 void nfsd4_cleanup_open_state(struct nfsd4_compound_state
*cstate
,
4669 struct nfsd4_open
*open
)
4671 if (open
->op_openowner
) {
4672 struct nfs4_stateowner
*so
= &open
->op_openowner
->oo_owner
;
4674 nfsd4_cstate_assign_replay(cstate
, so
);
4675 nfs4_put_stateowner(so
);
4678 kmem_cache_free(file_slab
, open
->op_file
);
4680 nfs4_put_stid(&open
->op_stp
->st_stid
);
4681 if (open
->op_odstate
)
4682 kmem_cache_free(odstate_slab
, open
->op_odstate
);
4686 nfsd4_renew(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
4687 union nfsd4_op_u
*u
)
4689 clientid_t
*clid
= &u
->renew
;
4690 struct nfs4_client
*clp
;
4692 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
4694 dprintk("process_renew(%08x/%08x): starting\n",
4695 clid
->cl_boot
, clid
->cl_id
);
4696 status
= lookup_clientid(clid
, cstate
, nn
);
4700 status
= nfserr_cb_path_down
;
4701 if (!list_empty(&clp
->cl_delegations
)
4702 && clp
->cl_cb_state
!= NFSD4_CB_UP
)
4710 nfsd4_end_grace(struct nfsd_net
*nn
)
4712 /* do nothing if grace period already ended */
4713 if (nn
->grace_ended
)
4716 dprintk("NFSD: end of grace period\n");
4717 nn
->grace_ended
= true;
4719 * If the server goes down again right now, an NFSv4
4720 * client will still be allowed to reclaim after it comes back up,
4721 * even if it hasn't yet had a chance to reclaim state this time.
4724 nfsd4_record_grace_done(nn
);
4726 * At this point, NFSv4 clients can still reclaim. But if the
4727 * server crashes, any that have not yet reclaimed will be out
4728 * of luck on the next boot.
4730 * (NFSv4.1+ clients are considered to have reclaimed once they
4731 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4732 * have reclaimed after their first OPEN.)
4734 locks_end_grace(&nn
->nfsd4_manager
);
4736 * At this point, and once lockd and/or any other containers
4737 * exit their grace period, further reclaims will fail and
4738 * regular locking can resume.
4743 * If we've waited a lease period but there are still clients trying to
4744 * reclaim, wait a little longer to give them a chance to finish.
4746 static bool clients_still_reclaiming(struct nfsd_net
*nn
)
4748 unsigned long now
= get_seconds();
4749 unsigned long double_grace_period_end
= nn
->boot_time
+
4750 2 * nn
->nfsd4_lease
;
4752 if (!nn
->somebody_reclaimed
)
4754 nn
->somebody_reclaimed
= false;
4756 * If we've given them *two* lease times to reclaim, and they're
4757 * still not done, give up:
4759 if (time_after(now
, double_grace_period_end
))
4765 nfs4_laundromat(struct nfsd_net
*nn
)
4767 struct nfs4_client
*clp
;
4768 struct nfs4_openowner
*oo
;
4769 struct nfs4_delegation
*dp
;
4770 struct nfs4_ol_stateid
*stp
;
4771 struct nfsd4_blocked_lock
*nbl
;
4772 struct list_head
*pos
, *next
, reaplist
;
4773 time_t cutoff
= get_seconds() - nn
->nfsd4_lease
;
4774 time_t t
, new_timeo
= nn
->nfsd4_lease
;
4776 dprintk("NFSD: laundromat service - starting\n");
4778 if (clients_still_reclaiming(nn
)) {
4782 nfsd4_end_grace(nn
);
4783 INIT_LIST_HEAD(&reaplist
);
4784 spin_lock(&nn
->client_lock
);
4785 list_for_each_safe(pos
, next
, &nn
->client_lru
) {
4786 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4787 if (time_after((unsigned long)clp
->cl_time
, (unsigned long)cutoff
)) {
4788 t
= clp
->cl_time
- cutoff
;
4789 new_timeo
= min(new_timeo
, t
);
4792 if (mark_client_expired_locked(clp
)) {
4793 dprintk("NFSD: client in use (clientid %08x)\n",
4794 clp
->cl_clientid
.cl_id
);
4797 list_add(&clp
->cl_lru
, &reaplist
);
4799 spin_unlock(&nn
->client_lock
);
4800 list_for_each_safe(pos
, next
, &reaplist
) {
4801 clp
= list_entry(pos
, struct nfs4_client
, cl_lru
);
4802 dprintk("NFSD: purging unused client (clientid %08x)\n",
4803 clp
->cl_clientid
.cl_id
);
4804 list_del_init(&clp
->cl_lru
);
4807 spin_lock(&state_lock
);
4808 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
4809 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
4810 if (time_after((unsigned long)dp
->dl_time
, (unsigned long)cutoff
)) {
4811 t
= dp
->dl_time
- cutoff
;
4812 new_timeo
= min(new_timeo
, t
);
4815 WARN_ON(!unhash_delegation_locked(dp
));
4816 list_add(&dp
->dl_recall_lru
, &reaplist
);
4818 spin_unlock(&state_lock
);
4819 while (!list_empty(&reaplist
)) {
4820 dp
= list_first_entry(&reaplist
, struct nfs4_delegation
,
4822 list_del_init(&dp
->dl_recall_lru
);
4823 revoke_delegation(dp
);
4826 spin_lock(&nn
->client_lock
);
4827 while (!list_empty(&nn
->close_lru
)) {
4828 oo
= list_first_entry(&nn
->close_lru
, struct nfs4_openowner
,
4830 if (time_after((unsigned long)oo
->oo_time
,
4831 (unsigned long)cutoff
)) {
4832 t
= oo
->oo_time
- cutoff
;
4833 new_timeo
= min(new_timeo
, t
);
4836 list_del_init(&oo
->oo_close_lru
);
4837 stp
= oo
->oo_last_closed_stid
;
4838 oo
->oo_last_closed_stid
= NULL
;
4839 spin_unlock(&nn
->client_lock
);
4840 nfs4_put_stid(&stp
->st_stid
);
4841 spin_lock(&nn
->client_lock
);
4843 spin_unlock(&nn
->client_lock
);
4846 * It's possible for a client to try and acquire an already held lock
4847 * that is being held for a long time, and then lose interest in it.
4848 * So, we clean out any un-revisited request after a lease period
4849 * under the assumption that the client is no longer interested.
4851 * RFC5661, sec. 9.6 states that the client must not rely on getting
4852 * notifications and must continue to poll for locks, even when the
4853 * server supports them. Thus this shouldn't lead to clients blocking
4854 * indefinitely once the lock does become free.
4856 BUG_ON(!list_empty(&reaplist
));
4857 spin_lock(&nn
->blocked_locks_lock
);
4858 while (!list_empty(&nn
->blocked_locks_lru
)) {
4859 nbl
= list_first_entry(&nn
->blocked_locks_lru
,
4860 struct nfsd4_blocked_lock
, nbl_lru
);
4861 if (time_after((unsigned long)nbl
->nbl_time
,
4862 (unsigned long)cutoff
)) {
4863 t
= nbl
->nbl_time
- cutoff
;
4864 new_timeo
= min(new_timeo
, t
);
4867 list_move(&nbl
->nbl_lru
, &reaplist
);
4868 list_del_init(&nbl
->nbl_list
);
4870 spin_unlock(&nn
->blocked_locks_lock
);
4872 while (!list_empty(&reaplist
)) {
4873 nbl
= list_first_entry(&reaplist
,
4874 struct nfsd4_blocked_lock
, nbl_lru
);
4875 list_del_init(&nbl
->nbl_lru
);
4876 free_blocked_lock(nbl
);
4879 new_timeo
= max_t(time_t, new_timeo
, NFSD_LAUNDROMAT_MINTIMEOUT
);
4883 static struct workqueue_struct
*laundry_wq
;
4884 static void laundromat_main(struct work_struct
*);
4887 laundromat_main(struct work_struct
*laundry
)
4890 struct delayed_work
*dwork
= to_delayed_work(laundry
);
4891 struct nfsd_net
*nn
= container_of(dwork
, struct nfsd_net
,
4894 t
= nfs4_laundromat(nn
);
4895 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t
);
4896 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, t
*HZ
);
4899 static inline __be32
nfs4_check_fh(struct svc_fh
*fhp
, struct nfs4_stid
*stp
)
4901 if (!fh_match(&fhp
->fh_handle
, &stp
->sc_file
->fi_fhandle
))
4902 return nfserr_bad_stateid
;
4907 access_permit_read(struct nfs4_ol_stateid
*stp
)
4909 return test_access(NFS4_SHARE_ACCESS_READ
, stp
) ||
4910 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
) ||
4911 test_access(NFS4_SHARE_ACCESS_WRITE
, stp
);
4915 access_permit_write(struct nfs4_ol_stateid
*stp
)
4917 return test_access(NFS4_SHARE_ACCESS_WRITE
, stp
) ||
4918 test_access(NFS4_SHARE_ACCESS_BOTH
, stp
);
4922 __be32
nfs4_check_openmode(struct nfs4_ol_stateid
*stp
, int flags
)
4924 __be32 status
= nfserr_openmode
;
4926 /* For lock stateid's, we test the parent open, not the lock: */
4927 if (stp
->st_openstp
)
4928 stp
= stp
->st_openstp
;
4929 if ((flags
& WR_STATE
) && !access_permit_write(stp
))
4931 if ((flags
& RD_STATE
) && !access_permit_read(stp
))
4938 static inline __be32
4939 check_special_stateids(struct net
*net
, svc_fh
*current_fh
, stateid_t
*stateid
, int flags
)
4941 if (ONE_STATEID(stateid
) && (flags
& RD_STATE
))
4943 else if (opens_in_grace(net
)) {
4944 /* Answer in remaining cases depends on existence of
4945 * conflicting state; so we must wait out the grace period. */
4946 return nfserr_grace
;
4947 } else if (flags
& WR_STATE
)
4948 return nfs4_share_conflict(current_fh
,
4949 NFS4_SHARE_DENY_WRITE
);
4950 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4951 return nfs4_share_conflict(current_fh
,
4952 NFS4_SHARE_DENY_READ
);
4956 * Allow READ/WRITE during grace period on recovered state only for files
4957 * that are not able to provide mandatory locking.
4960 grace_disallows_io(struct net
*net
, struct inode
*inode
)
4962 return opens_in_grace(net
) && mandatory_lock(inode
);
4965 static __be32
check_stateid_generation(stateid_t
*in
, stateid_t
*ref
, bool has_session
)
4968 * When sessions are used the stateid generation number is ignored
4971 if (has_session
&& in
->si_generation
== 0)
4974 if (in
->si_generation
== ref
->si_generation
)
4977 /* If the client sends us a stateid from the future, it's buggy: */
4978 if (nfsd4_stateid_generation_after(in
, ref
))
4979 return nfserr_bad_stateid
;
4981 * However, we could see a stateid from the past, even from a
4982 * non-buggy client. For example, if the client sends a lock
4983 * while some IO is outstanding, the lock may bump si_generation
4984 * while the IO is still in flight. The client could avoid that
4985 * situation by waiting for responses on all the IO requests,
4986 * but better performance may result in retrying IO that
4987 * receives an old_stateid error if requests are rarely
4988 * reordered in flight:
4990 return nfserr_old_stateid
;
4993 static __be32
nfsd4_stid_check_stateid_generation(stateid_t
*in
, struct nfs4_stid
*s
, bool has_session
)
4997 spin_lock(&s
->sc_lock
);
4998 ret
= nfsd4_verify_open_stid(s
);
5000 ret
= check_stateid_generation(in
, &s
->sc_stateid
, has_session
);
5001 spin_unlock(&s
->sc_lock
);
5005 static __be32
nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid
*ols
)
5007 if (ols
->st_stateowner
->so_is_open_owner
&&
5008 !(openowner(ols
->st_stateowner
)->oo_flags
& NFS4_OO_CONFIRMED
))
5009 return nfserr_bad_stateid
;
5013 static __be32
nfsd4_validate_stateid(struct nfs4_client
*cl
, stateid_t
*stateid
)
5015 struct nfs4_stid
*s
;
5016 __be32 status
= nfserr_bad_stateid
;
5018 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
) ||
5019 CLOSE_STATEID(stateid
))
5021 /* Client debugging aid. */
5022 if (!same_clid(&stateid
->si_opaque
.so_clid
, &cl
->cl_clientid
)) {
5023 char addr_str
[INET6_ADDRSTRLEN
];
5024 rpc_ntop((struct sockaddr
*)&cl
->cl_addr
, addr_str
,
5026 pr_warn_ratelimited("NFSD: client %s testing state ID "
5027 "with incorrect client ID\n", addr_str
);
5030 spin_lock(&cl
->cl_lock
);
5031 s
= find_stateid_locked(cl
, stateid
);
5034 status
= nfsd4_stid_check_stateid_generation(stateid
, s
, 1);
5037 switch (s
->sc_type
) {
5038 case NFS4_DELEG_STID
:
5041 case NFS4_REVOKED_DELEG_STID
:
5042 status
= nfserr_deleg_revoked
;
5044 case NFS4_OPEN_STID
:
5045 case NFS4_LOCK_STID
:
5046 status
= nfsd4_check_openowner_confirmed(openlockstateid(s
));
5049 printk("unknown stateid type %x\n", s
->sc_type
);
5051 case NFS4_CLOSED_STID
:
5052 case NFS4_CLOSED_DELEG_STID
:
5053 status
= nfserr_bad_stateid
;
5056 spin_unlock(&cl
->cl_lock
);
5061 nfsd4_lookup_stateid(struct nfsd4_compound_state
*cstate
,
5062 stateid_t
*stateid
, unsigned char typemask
,
5063 struct nfs4_stid
**s
, struct nfsd_net
*nn
)
5066 bool return_revoked
= false;
5069 * only return revoked delegations if explicitly asked.
5070 * otherwise we report revoked or bad_stateid status.
5072 if (typemask
& NFS4_REVOKED_DELEG_STID
)
5073 return_revoked
= true;
5074 else if (typemask
& NFS4_DELEG_STID
)
5075 typemask
|= NFS4_REVOKED_DELEG_STID
;
5077 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
) ||
5078 CLOSE_STATEID(stateid
))
5079 return nfserr_bad_stateid
;
5080 status
= lookup_clientid(&stateid
->si_opaque
.so_clid
, cstate
, nn
);
5081 if (status
== nfserr_stale_clientid
) {
5082 if (cstate
->session
)
5083 return nfserr_bad_stateid
;
5084 return nfserr_stale_stateid
;
5088 *s
= find_stateid_by_type(cstate
->clp
, stateid
, typemask
);
5090 return nfserr_bad_stateid
;
5091 if (((*s
)->sc_type
== NFS4_REVOKED_DELEG_STID
) && !return_revoked
) {
5093 if (cstate
->minorversion
)
5094 return nfserr_deleg_revoked
;
5095 return nfserr_bad_stateid
;
5100 static struct file
*
5101 nfs4_find_file(struct nfs4_stid
*s
, int flags
)
5106 switch (s
->sc_type
) {
5107 case NFS4_DELEG_STID
:
5108 if (WARN_ON_ONCE(!s
->sc_file
->fi_deleg_file
))
5110 return get_file(s
->sc_file
->fi_deleg_file
);
5111 case NFS4_OPEN_STID
:
5112 case NFS4_LOCK_STID
:
5113 if (flags
& RD_STATE
)
5114 return find_readable_file(s
->sc_file
);
5116 return find_writeable_file(s
->sc_file
);
5124 nfs4_check_olstateid(struct nfs4_ol_stateid
*ols
, int flags
)
5128 status
= nfsd4_check_openowner_confirmed(ols
);
5131 return nfs4_check_openmode(ols
, flags
);
5135 nfs4_check_file(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct nfs4_stid
*s
,
5136 struct file
**filpp
, bool *tmp_file
, int flags
)
5138 int acc
= (flags
& RD_STATE
) ? NFSD_MAY_READ
: NFSD_MAY_WRITE
;
5142 file
= nfs4_find_file(s
, flags
);
5144 status
= nfsd_permission(rqstp
, fhp
->fh_export
, fhp
->fh_dentry
,
5145 acc
| NFSD_MAY_OWNER_OVERRIDE
);
5153 status
= nfsd_open(rqstp
, fhp
, S_IFREG
, acc
, filpp
);
5165 * Checks for stateid operations
5168 nfs4_preprocess_stateid_op(struct svc_rqst
*rqstp
,
5169 struct nfsd4_compound_state
*cstate
, struct svc_fh
*fhp
,
5170 stateid_t
*stateid
, int flags
, struct file
**filpp
, bool *tmp_file
)
5172 struct inode
*ino
= d_inode(fhp
->fh_dentry
);
5173 struct net
*net
= SVC_NET(rqstp
);
5174 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5175 struct nfs4_stid
*s
= NULL
;
5183 if (grace_disallows_io(net
, ino
))
5184 return nfserr_grace
;
5186 if (ZERO_STATEID(stateid
) || ONE_STATEID(stateid
)) {
5187 status
= check_special_stateids(net
, fhp
, stateid
, flags
);
5191 status
= nfsd4_lookup_stateid(cstate
, stateid
,
5192 NFS4_DELEG_STID
|NFS4_OPEN_STID
|NFS4_LOCK_STID
,
5196 status
= nfsd4_stid_check_stateid_generation(stateid
, s
,
5197 nfsd4_has_session(cstate
));
5201 switch (s
->sc_type
) {
5202 case NFS4_DELEG_STID
:
5203 status
= nfs4_check_delegmode(delegstateid(s
), flags
);
5205 case NFS4_OPEN_STID
:
5206 case NFS4_LOCK_STID
:
5207 status
= nfs4_check_olstateid(openlockstateid(s
), flags
);
5210 status
= nfserr_bad_stateid
;
5215 status
= nfs4_check_fh(fhp
, s
);
5218 if (!status
&& filpp
)
5219 status
= nfs4_check_file(rqstp
, fhp
, s
, filpp
, tmp_file
, flags
);
5227 * Test if the stateid is valid
5230 nfsd4_test_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5231 union nfsd4_op_u
*u
)
5233 struct nfsd4_test_stateid
*test_stateid
= &u
->test_stateid
;
5234 struct nfsd4_test_stateid_id
*stateid
;
5235 struct nfs4_client
*cl
= cstate
->session
->se_client
;
5237 list_for_each_entry(stateid
, &test_stateid
->ts_stateid_list
, ts_id_list
)
5238 stateid
->ts_id_status
=
5239 nfsd4_validate_stateid(cl
, &stateid
->ts_id_stateid
);
5245 nfsd4_free_lock_stateid(stateid_t
*stateid
, struct nfs4_stid
*s
)
5247 struct nfs4_ol_stateid
*stp
= openlockstateid(s
);
5250 ret
= nfsd4_lock_ol_stateid(stp
);
5254 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
5258 ret
= nfserr_locks_held
;
5259 if (check_for_locks(stp
->st_stid
.sc_file
,
5260 lockowner(stp
->st_stateowner
)))
5263 release_lock_stateid(stp
);
5267 mutex_unlock(&stp
->st_mutex
);
5274 nfsd4_free_stateid(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5275 union nfsd4_op_u
*u
)
5277 struct nfsd4_free_stateid
*free_stateid
= &u
->free_stateid
;
5278 stateid_t
*stateid
= &free_stateid
->fr_stateid
;
5279 struct nfs4_stid
*s
;
5280 struct nfs4_delegation
*dp
;
5281 struct nfs4_client
*cl
= cstate
->session
->se_client
;
5282 __be32 ret
= nfserr_bad_stateid
;
5284 spin_lock(&cl
->cl_lock
);
5285 s
= find_stateid_locked(cl
, stateid
);
5288 spin_lock(&s
->sc_lock
);
5289 switch (s
->sc_type
) {
5290 case NFS4_DELEG_STID
:
5291 ret
= nfserr_locks_held
;
5293 case NFS4_OPEN_STID
:
5294 ret
= check_stateid_generation(stateid
, &s
->sc_stateid
, 1);
5297 ret
= nfserr_locks_held
;
5299 case NFS4_LOCK_STID
:
5300 spin_unlock(&s
->sc_lock
);
5301 refcount_inc(&s
->sc_count
);
5302 spin_unlock(&cl
->cl_lock
);
5303 ret
= nfsd4_free_lock_stateid(stateid
, s
);
5305 case NFS4_REVOKED_DELEG_STID
:
5306 spin_unlock(&s
->sc_lock
);
5307 dp
= delegstateid(s
);
5308 list_del_init(&dp
->dl_recall_lru
);
5309 spin_unlock(&cl
->cl_lock
);
5313 /* Default falls through and returns nfserr_bad_stateid */
5315 spin_unlock(&s
->sc_lock
);
5317 spin_unlock(&cl
->cl_lock
);
5325 return (type
== NFS4_READW_LT
|| type
== NFS4_READ_LT
) ?
5326 RD_STATE
: WR_STATE
;
5329 static __be32
nfs4_seqid_op_checks(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
, u32 seqid
, struct nfs4_ol_stateid
*stp
)
5331 struct svc_fh
*current_fh
= &cstate
->current_fh
;
5332 struct nfs4_stateowner
*sop
= stp
->st_stateowner
;
5335 status
= nfsd4_check_seqid(cstate
, sop
, seqid
);
5338 status
= nfsd4_lock_ol_stateid(stp
);
5339 if (status
!= nfs_ok
)
5341 status
= check_stateid_generation(stateid
, &stp
->st_stid
.sc_stateid
, nfsd4_has_session(cstate
));
5342 if (status
== nfs_ok
)
5343 status
= nfs4_check_fh(current_fh
, &stp
->st_stid
);
5344 if (status
!= nfs_ok
)
5345 mutex_unlock(&stp
->st_mutex
);
5350 * Checks for sequence id mutating operations.
5353 nfs4_preprocess_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
5354 stateid_t
*stateid
, char typemask
,
5355 struct nfs4_ol_stateid
**stpp
,
5356 struct nfsd_net
*nn
)
5359 struct nfs4_stid
*s
;
5360 struct nfs4_ol_stateid
*stp
= NULL
;
5362 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT
"\n", __func__
,
5363 seqid
, STATEID_VAL(stateid
));
5366 status
= nfsd4_lookup_stateid(cstate
, stateid
, typemask
, &s
, nn
);
5369 stp
= openlockstateid(s
);
5370 nfsd4_cstate_assign_replay(cstate
, stp
->st_stateowner
);
5372 status
= nfs4_seqid_op_checks(cstate
, stateid
, seqid
, stp
);
5376 nfs4_put_stid(&stp
->st_stid
);
5380 static __be32
nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state
*cstate
, u32 seqid
,
5381 stateid_t
*stateid
, struct nfs4_ol_stateid
**stpp
, struct nfsd_net
*nn
)
5384 struct nfs4_openowner
*oo
;
5385 struct nfs4_ol_stateid
*stp
;
5387 status
= nfs4_preprocess_seqid_op(cstate
, seqid
, stateid
,
5388 NFS4_OPEN_STID
, &stp
, nn
);
5391 oo
= openowner(stp
->st_stateowner
);
5392 if (!(oo
->oo_flags
& NFS4_OO_CONFIRMED
)) {
5393 mutex_unlock(&stp
->st_mutex
);
5394 nfs4_put_stid(&stp
->st_stid
);
5395 return nfserr_bad_stateid
;
5402 nfsd4_open_confirm(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5403 union nfsd4_op_u
*u
)
5405 struct nfsd4_open_confirm
*oc
= &u
->open_confirm
;
5407 struct nfs4_openowner
*oo
;
5408 struct nfs4_ol_stateid
*stp
;
5409 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5411 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5412 cstate
->current_fh
.fh_dentry
);
5414 status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0);
5418 status
= nfs4_preprocess_seqid_op(cstate
,
5419 oc
->oc_seqid
, &oc
->oc_req_stateid
,
5420 NFS4_OPEN_STID
, &stp
, nn
);
5423 oo
= openowner(stp
->st_stateowner
);
5424 status
= nfserr_bad_stateid
;
5425 if (oo
->oo_flags
& NFS4_OO_CONFIRMED
) {
5426 mutex_unlock(&stp
->st_mutex
);
5429 oo
->oo_flags
|= NFS4_OO_CONFIRMED
;
5430 nfs4_inc_and_copy_stateid(&oc
->oc_resp_stateid
, &stp
->st_stid
);
5431 mutex_unlock(&stp
->st_mutex
);
5432 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT
"\n",
5433 __func__
, oc
->oc_seqid
, STATEID_VAL(&stp
->st_stid
.sc_stateid
));
5435 nfsd4_client_record_create(oo
->oo_owner
.so_client
);
5438 nfs4_put_stid(&stp
->st_stid
);
5440 nfsd4_bump_seqid(cstate
, status
);
5444 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid
*stp
, u32 access
)
5446 if (!test_access(access
, stp
))
5448 nfs4_file_put_access(stp
->st_stid
.sc_file
, access
);
5449 clear_access(access
, stp
);
5452 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid
*stp
, u32 to_access
)
5454 switch (to_access
) {
5455 case NFS4_SHARE_ACCESS_READ
:
5456 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_WRITE
);
5457 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5459 case NFS4_SHARE_ACCESS_WRITE
:
5460 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_READ
);
5461 nfs4_stateid_downgrade_bit(stp
, NFS4_SHARE_ACCESS_BOTH
);
5463 case NFS4_SHARE_ACCESS_BOTH
:
5471 nfsd4_open_downgrade(struct svc_rqst
*rqstp
,
5472 struct nfsd4_compound_state
*cstate
, union nfsd4_op_u
*u
)
5474 struct nfsd4_open_downgrade
*od
= &u
->open_downgrade
;
5476 struct nfs4_ol_stateid
*stp
;
5477 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5479 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5480 cstate
->current_fh
.fh_dentry
);
5482 /* We don't yet support WANT bits: */
5483 if (od
->od_deleg_want
)
5484 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__
,
5487 status
= nfs4_preprocess_confirmed_seqid_op(cstate
, od
->od_seqid
,
5488 &od
->od_stateid
, &stp
, nn
);
5491 status
= nfserr_inval
;
5492 if (!test_access(od
->od_share_access
, stp
)) {
5493 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5494 stp
->st_access_bmap
, od
->od_share_access
);
5497 if (!test_deny(od
->od_share_deny
, stp
)) {
5498 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5499 stp
->st_deny_bmap
, od
->od_share_deny
);
5502 nfs4_stateid_downgrade(stp
, od
->od_share_access
);
5503 reset_union_bmap_deny(od
->od_share_deny
, stp
);
5504 nfs4_inc_and_copy_stateid(&od
->od_stateid
, &stp
->st_stid
);
5507 mutex_unlock(&stp
->st_mutex
);
5508 nfs4_put_stid(&stp
->st_stid
);
5510 nfsd4_bump_seqid(cstate
, status
);
5514 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid
*s
)
5516 struct nfs4_client
*clp
= s
->st_stid
.sc_client
;
5518 LIST_HEAD(reaplist
);
5520 spin_lock(&clp
->cl_lock
);
5521 unhashed
= unhash_open_stateid(s
, &reaplist
);
5523 if (clp
->cl_minorversion
) {
5525 put_ol_stateid_locked(s
, &reaplist
);
5526 spin_unlock(&clp
->cl_lock
);
5527 free_ol_stateid_reaplist(&reaplist
);
5529 spin_unlock(&clp
->cl_lock
);
5530 free_ol_stateid_reaplist(&reaplist
);
5532 move_to_close_lru(s
, clp
->net
);
5537 * nfs4_unlock_state() called after encode
5540 nfsd4_close(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5541 union nfsd4_op_u
*u
)
5543 struct nfsd4_close
*close
= &u
->close
;
5545 struct nfs4_ol_stateid
*stp
;
5546 struct net
*net
= SVC_NET(rqstp
);
5547 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5549 dprintk("NFSD: nfsd4_close on file %pd\n",
5550 cstate
->current_fh
.fh_dentry
);
5552 status
= nfs4_preprocess_seqid_op(cstate
, close
->cl_seqid
,
5554 NFS4_OPEN_STID
|NFS4_CLOSED_STID
,
5556 nfsd4_bump_seqid(cstate
, status
);
5560 stp
->st_stid
.sc_type
= NFS4_CLOSED_STID
;
5563 * Technically we don't _really_ have to increment or copy it, since
5564 * it should just be gone after this operation and we clobber the
5565 * copied value below, but we continue to do so here just to ensure
5566 * that racing ops see that there was a state change.
5568 nfs4_inc_and_copy_stateid(&close
->cl_stateid
, &stp
->st_stid
);
5570 nfsd4_close_open_stateid(stp
);
5571 mutex_unlock(&stp
->st_mutex
);
5573 /* v4.1+ suggests that we send a special stateid in here, since the
5574 * clients should just ignore this anyway. Since this is not useful
5575 * for v4.0 clients either, we set it to the special close_stateid
5578 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
5580 memcpy(&close
->cl_stateid
, &close_stateid
, sizeof(close
->cl_stateid
));
5582 /* put reference from nfs4_preprocess_seqid_op */
5583 nfs4_put_stid(&stp
->st_stid
);
5589 nfsd4_delegreturn(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5590 union nfsd4_op_u
*u
)
5592 struct nfsd4_delegreturn
*dr
= &u
->delegreturn
;
5593 struct nfs4_delegation
*dp
;
5594 stateid_t
*stateid
= &dr
->dr_stateid
;
5595 struct nfs4_stid
*s
;
5597 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
5599 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
5602 status
= nfsd4_lookup_stateid(cstate
, stateid
, NFS4_DELEG_STID
, &s
, nn
);
5605 dp
= delegstateid(s
);
5606 status
= nfsd4_stid_check_stateid_generation(stateid
, &dp
->dl_stid
, nfsd4_has_session(cstate
));
5610 destroy_delegation(dp
);
5612 nfs4_put_stid(&dp
->dl_stid
);
5618 end_offset(u64 start
, u64 len
)
5623 return end
>= start
? end
: NFS4_MAX_UINT64
;
5626 /* last octet in a range */
5628 last_byte_offset(u64 start
, u64 len
)
5634 return end
> start
? end
- 1: NFS4_MAX_UINT64
;
5638 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5639 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5640 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5641 * locking, this prevents us from being completely protocol-compliant. The
5642 * real solution to this problem is to start using unsigned file offsets in
5643 * the VFS, but this is a very deep change!
5646 nfs4_transform_lock_offset(struct file_lock
*lock
)
5648 if (lock
->fl_start
< 0)
5649 lock
->fl_start
= OFFSET_MAX
;
5650 if (lock
->fl_end
< 0)
5651 lock
->fl_end
= OFFSET_MAX
;
5655 nfsd4_fl_get_owner(fl_owner_t owner
)
5657 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5659 nfs4_get_stateowner(&lo
->lo_owner
);
5664 nfsd4_fl_put_owner(fl_owner_t owner
)
5666 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)owner
;
5669 nfs4_put_stateowner(&lo
->lo_owner
);
5673 nfsd4_lm_notify(struct file_lock
*fl
)
5675 struct nfs4_lockowner
*lo
= (struct nfs4_lockowner
*)fl
->fl_owner
;
5676 struct net
*net
= lo
->lo_owner
.so_client
->net
;
5677 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5678 struct nfsd4_blocked_lock
*nbl
= container_of(fl
,
5679 struct nfsd4_blocked_lock
, nbl_lock
);
5682 /* An empty list means that something else is going to be using it */
5683 spin_lock(&nn
->blocked_locks_lock
);
5684 if (!list_empty(&nbl
->nbl_list
)) {
5685 list_del_init(&nbl
->nbl_list
);
5686 list_del_init(&nbl
->nbl_lru
);
5689 spin_unlock(&nn
->blocked_locks_lock
);
5692 nfsd4_run_cb(&nbl
->nbl_cb
);
5695 static const struct lock_manager_operations nfsd_posix_mng_ops
= {
5696 .lm_notify
= nfsd4_lm_notify
,
5697 .lm_get_owner
= nfsd4_fl_get_owner
,
5698 .lm_put_owner
= nfsd4_fl_put_owner
,
5702 nfs4_set_lock_denied(struct file_lock
*fl
, struct nfsd4_lock_denied
*deny
)
5704 struct nfs4_lockowner
*lo
;
5706 if (fl
->fl_lmops
== &nfsd_posix_mng_ops
) {
5707 lo
= (struct nfs4_lockowner
*) fl
->fl_owner
;
5708 deny
->ld_owner
.data
= kmemdup(lo
->lo_owner
.so_owner
.data
,
5709 lo
->lo_owner
.so_owner
.len
, GFP_KERNEL
);
5710 if (!deny
->ld_owner
.data
)
5711 /* We just don't care that much */
5713 deny
->ld_owner
.len
= lo
->lo_owner
.so_owner
.len
;
5714 deny
->ld_clientid
= lo
->lo_owner
.so_client
->cl_clientid
;
5717 deny
->ld_owner
.len
= 0;
5718 deny
->ld_owner
.data
= NULL
;
5719 deny
->ld_clientid
.cl_boot
= 0;
5720 deny
->ld_clientid
.cl_id
= 0;
5722 deny
->ld_start
= fl
->fl_start
;
5723 deny
->ld_length
= NFS4_MAX_UINT64
;
5724 if (fl
->fl_end
!= NFS4_MAX_UINT64
)
5725 deny
->ld_length
= fl
->fl_end
- fl
->fl_start
+ 1;
5726 deny
->ld_type
= NFS4_READ_LT
;
5727 if (fl
->fl_type
!= F_RDLCK
)
5728 deny
->ld_type
= NFS4_WRITE_LT
;
5731 static struct nfs4_lockowner
*
5732 find_lockowner_str_locked(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5734 unsigned int strhashval
= ownerstr_hashval(owner
);
5735 struct nfs4_stateowner
*so
;
5737 lockdep_assert_held(&clp
->cl_lock
);
5739 list_for_each_entry(so
, &clp
->cl_ownerstr_hashtbl
[strhashval
],
5741 if (so
->so_is_open_owner
)
5743 if (same_owner_str(so
, owner
))
5744 return lockowner(nfs4_get_stateowner(so
));
5749 static struct nfs4_lockowner
*
5750 find_lockowner_str(struct nfs4_client
*clp
, struct xdr_netobj
*owner
)
5752 struct nfs4_lockowner
*lo
;
5754 spin_lock(&clp
->cl_lock
);
5755 lo
= find_lockowner_str_locked(clp
, owner
);
5756 spin_unlock(&clp
->cl_lock
);
5760 static void nfs4_unhash_lockowner(struct nfs4_stateowner
*sop
)
5762 unhash_lockowner_locked(lockowner(sop
));
5765 static void nfs4_free_lockowner(struct nfs4_stateowner
*sop
)
5767 struct nfs4_lockowner
*lo
= lockowner(sop
);
5769 kmem_cache_free(lockowner_slab
, lo
);
5772 static const struct nfs4_stateowner_operations lockowner_ops
= {
5773 .so_unhash
= nfs4_unhash_lockowner
,
5774 .so_free
= nfs4_free_lockowner
,
5778 * Alloc a lock owner structure.
5779 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5782 * strhashval = ownerstr_hashval
5784 static struct nfs4_lockowner
*
5785 alloc_init_lock_stateowner(unsigned int strhashval
, struct nfs4_client
*clp
,
5786 struct nfs4_ol_stateid
*open_stp
,
5787 struct nfsd4_lock
*lock
)
5789 struct nfs4_lockowner
*lo
, *ret
;
5791 lo
= alloc_stateowner(lockowner_slab
, &lock
->lk_new_owner
, clp
);
5794 INIT_LIST_HEAD(&lo
->lo_blocked
);
5795 INIT_LIST_HEAD(&lo
->lo_owner
.so_stateids
);
5796 lo
->lo_owner
.so_is_open_owner
= 0;
5797 lo
->lo_owner
.so_seqid
= lock
->lk_new_lock_seqid
;
5798 lo
->lo_owner
.so_ops
= &lockowner_ops
;
5799 spin_lock(&clp
->cl_lock
);
5800 ret
= find_lockowner_str_locked(clp
, &lock
->lk_new_owner
);
5802 list_add(&lo
->lo_owner
.so_strhash
,
5803 &clp
->cl_ownerstr_hashtbl
[strhashval
]);
5806 nfs4_free_stateowner(&lo
->lo_owner
);
5808 spin_unlock(&clp
->cl_lock
);
5812 static struct nfs4_ol_stateid
*
5813 find_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fp
)
5815 struct nfs4_ol_stateid
*lst
;
5816 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5818 lockdep_assert_held(&clp
->cl_lock
);
5820 list_for_each_entry(lst
, &lo
->lo_owner
.so_stateids
, st_perstateowner
) {
5821 if (lst
->st_stid
.sc_type
!= NFS4_LOCK_STID
)
5823 if (lst
->st_stid
.sc_file
== fp
) {
5824 refcount_inc(&lst
->st_stid
.sc_count
);
5831 static struct nfs4_ol_stateid
*
5832 init_lock_stateid(struct nfs4_ol_stateid
*stp
, struct nfs4_lockowner
*lo
,
5833 struct nfs4_file
*fp
, struct inode
*inode
,
5834 struct nfs4_ol_stateid
*open_stp
)
5836 struct nfs4_client
*clp
= lo
->lo_owner
.so_client
;
5837 struct nfs4_ol_stateid
*retstp
;
5839 mutex_init(&stp
->st_mutex
);
5840 mutex_lock_nested(&stp
->st_mutex
, OPEN_STATEID_MUTEX
);
5842 spin_lock(&clp
->cl_lock
);
5843 spin_lock(&fp
->fi_lock
);
5844 retstp
= find_lock_stateid(lo
, fp
);
5848 refcount_inc(&stp
->st_stid
.sc_count
);
5849 stp
->st_stid
.sc_type
= NFS4_LOCK_STID
;
5850 stp
->st_stateowner
= nfs4_get_stateowner(&lo
->lo_owner
);
5852 stp
->st_stid
.sc_file
= fp
;
5853 stp
->st_access_bmap
= 0;
5854 stp
->st_deny_bmap
= open_stp
->st_deny_bmap
;
5855 stp
->st_openstp
= open_stp
;
5856 list_add(&stp
->st_locks
, &open_stp
->st_locks
);
5857 list_add(&stp
->st_perstateowner
, &lo
->lo_owner
.so_stateids
);
5858 list_add(&stp
->st_perfile
, &fp
->fi_stateids
);
5860 spin_unlock(&fp
->fi_lock
);
5861 spin_unlock(&clp
->cl_lock
);
5863 if (nfsd4_lock_ol_stateid(retstp
) != nfs_ok
) {
5864 nfs4_put_stid(&retstp
->st_stid
);
5867 /* To keep mutex tracking happy */
5868 mutex_unlock(&stp
->st_mutex
);
5874 static struct nfs4_ol_stateid
*
5875 find_or_create_lock_stateid(struct nfs4_lockowner
*lo
, struct nfs4_file
*fi
,
5876 struct inode
*inode
, struct nfs4_ol_stateid
*ost
,
5879 struct nfs4_stid
*ns
= NULL
;
5880 struct nfs4_ol_stateid
*lst
;
5881 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5882 struct nfs4_client
*clp
= oo
->oo_owner
.so_client
;
5885 spin_lock(&clp
->cl_lock
);
5886 lst
= find_lock_stateid(lo
, fi
);
5887 spin_unlock(&clp
->cl_lock
);
5889 if (nfsd4_lock_ol_stateid(lst
) == nfs_ok
)
5891 nfs4_put_stid(&lst
->st_stid
);
5893 ns
= nfs4_alloc_stid(clp
, stateid_slab
, nfs4_free_lock_stateid
);
5897 lst
= init_lock_stateid(openlockstateid(ns
), lo
, fi
, inode
, ost
);
5898 if (lst
== openlockstateid(ns
))
5907 check_lock_length(u64 offset
, u64 length
)
5909 return ((length
== 0) || ((length
!= NFS4_MAX_UINT64
) &&
5910 (length
> ~offset
)));
5913 static void get_lock_access(struct nfs4_ol_stateid
*lock_stp
, u32 access
)
5915 struct nfs4_file
*fp
= lock_stp
->st_stid
.sc_file
;
5917 lockdep_assert_held(&fp
->fi_lock
);
5919 if (test_access(access
, lock_stp
))
5921 __nfs4_file_get_access(fp
, access
);
5922 set_access(access
, lock_stp
);
5926 lookup_or_create_lock_state(struct nfsd4_compound_state
*cstate
,
5927 struct nfs4_ol_stateid
*ost
,
5928 struct nfsd4_lock
*lock
,
5929 struct nfs4_ol_stateid
**plst
, bool *new)
5932 struct nfs4_file
*fi
= ost
->st_stid
.sc_file
;
5933 struct nfs4_openowner
*oo
= openowner(ost
->st_stateowner
);
5934 struct nfs4_client
*cl
= oo
->oo_owner
.so_client
;
5935 struct inode
*inode
= d_inode(cstate
->current_fh
.fh_dentry
);
5936 struct nfs4_lockowner
*lo
;
5937 struct nfs4_ol_stateid
*lst
;
5938 unsigned int strhashval
;
5940 lo
= find_lockowner_str(cl
, &lock
->lk_new_owner
);
5942 strhashval
= ownerstr_hashval(&lock
->lk_new_owner
);
5943 lo
= alloc_init_lock_stateowner(strhashval
, cl
, ost
, lock
);
5945 return nfserr_jukebox
;
5947 /* with an existing lockowner, seqids must be the same */
5948 status
= nfserr_bad_seqid
;
5949 if (!cstate
->minorversion
&&
5950 lock
->lk_new_lock_seqid
!= lo
->lo_owner
.so_seqid
)
5954 lst
= find_or_create_lock_stateid(lo
, fi
, inode
, ost
, new);
5956 status
= nfserr_jukebox
;
5963 nfs4_put_stateowner(&lo
->lo_owner
);
5971 nfsd4_lock(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
5972 union nfsd4_op_u
*u
)
5974 struct nfsd4_lock
*lock
= &u
->lock
;
5975 struct nfs4_openowner
*open_sop
= NULL
;
5976 struct nfs4_lockowner
*lock_sop
= NULL
;
5977 struct nfs4_ol_stateid
*lock_stp
= NULL
;
5978 struct nfs4_ol_stateid
*open_stp
= NULL
;
5979 struct nfs4_file
*fp
;
5980 struct file
*filp
= NULL
;
5981 struct nfsd4_blocked_lock
*nbl
= NULL
;
5982 struct file_lock
*file_lock
= NULL
;
5983 struct file_lock
*conflock
= NULL
;
5988 unsigned char fl_type
;
5989 unsigned int fl_flags
= FL_POSIX
;
5990 struct net
*net
= SVC_NET(rqstp
);
5991 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
5993 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5994 (long long) lock
->lk_offset
,
5995 (long long) lock
->lk_length
);
5997 if (check_lock_length(lock
->lk_offset
, lock
->lk_length
))
5998 return nfserr_inval
;
6000 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
,
6001 S_IFREG
, NFSD_MAY_LOCK
))) {
6002 dprintk("NFSD: nfsd4_lock: permission denied!\n");
6006 if (lock
->lk_is_new
) {
6007 if (nfsd4_has_session(cstate
))
6008 /* See rfc 5661 18.10.3: given clientid is ignored: */
6009 memcpy(&lock
->lk_new_clientid
,
6010 &cstate
->session
->se_client
->cl_clientid
,
6011 sizeof(clientid_t
));
6013 status
= nfserr_stale_clientid
;
6014 if (STALE_CLIENTID(&lock
->lk_new_clientid
, nn
))
6017 /* validate and update open stateid and open seqid */
6018 status
= nfs4_preprocess_confirmed_seqid_op(cstate
,
6019 lock
->lk_new_open_seqid
,
6020 &lock
->lk_new_open_stateid
,
6024 mutex_unlock(&open_stp
->st_mutex
);
6025 open_sop
= openowner(open_stp
->st_stateowner
);
6026 status
= nfserr_bad_stateid
;
6027 if (!same_clid(&open_sop
->oo_owner
.so_client
->cl_clientid
,
6028 &lock
->lk_new_clientid
))
6030 status
= lookup_or_create_lock_state(cstate
, open_stp
, lock
,
6033 status
= nfs4_preprocess_seqid_op(cstate
,
6034 lock
->lk_old_lock_seqid
,
6035 &lock
->lk_old_lock_stateid
,
6036 NFS4_LOCK_STID
, &lock_stp
, nn
);
6040 lock_sop
= lockowner(lock_stp
->st_stateowner
);
6042 lkflg
= setlkflg(lock
->lk_type
);
6043 status
= nfs4_check_openmode(lock_stp
, lkflg
);
6047 status
= nfserr_grace
;
6048 if (locks_in_grace(net
) && !lock
->lk_reclaim
)
6050 status
= nfserr_no_grace
;
6051 if (!locks_in_grace(net
) && lock
->lk_reclaim
)
6054 fp
= lock_stp
->st_stid
.sc_file
;
6055 switch (lock
->lk_type
) {
6057 if (nfsd4_has_session(cstate
))
6058 fl_flags
|= FL_SLEEP
;
6061 spin_lock(&fp
->fi_lock
);
6062 filp
= find_readable_file_locked(fp
);
6064 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_READ
);
6065 spin_unlock(&fp
->fi_lock
);
6068 case NFS4_WRITEW_LT
:
6069 if (nfsd4_has_session(cstate
))
6070 fl_flags
|= FL_SLEEP
;
6073 spin_lock(&fp
->fi_lock
);
6074 filp
= find_writeable_file_locked(fp
);
6076 get_lock_access(lock_stp
, NFS4_SHARE_ACCESS_WRITE
);
6077 spin_unlock(&fp
->fi_lock
);
6081 status
= nfserr_inval
;
6086 status
= nfserr_openmode
;
6090 nbl
= find_or_allocate_block(lock_sop
, &fp
->fi_fhandle
, nn
);
6092 dprintk("NFSD: %s: unable to allocate block!\n", __func__
);
6093 status
= nfserr_jukebox
;
6097 file_lock
= &nbl
->nbl_lock
;
6098 file_lock
->fl_type
= fl_type
;
6099 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(&lock_sop
->lo_owner
));
6100 file_lock
->fl_pid
= current
->tgid
;
6101 file_lock
->fl_file
= filp
;
6102 file_lock
->fl_flags
= fl_flags
;
6103 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
6104 file_lock
->fl_start
= lock
->lk_offset
;
6105 file_lock
->fl_end
= last_byte_offset(lock
->lk_offset
, lock
->lk_length
);
6106 nfs4_transform_lock_offset(file_lock
);
6108 conflock
= locks_alloc_lock();
6110 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6111 status
= nfserr_jukebox
;
6115 if (fl_flags
& FL_SLEEP
) {
6116 nbl
->nbl_time
= jiffies
;
6117 spin_lock(&nn
->blocked_locks_lock
);
6118 list_add_tail(&nbl
->nbl_list
, &lock_sop
->lo_blocked
);
6119 list_add_tail(&nbl
->nbl_lru
, &nn
->blocked_locks_lru
);
6120 spin_unlock(&nn
->blocked_locks_lock
);
6123 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, conflock
);
6125 case 0: /* success! */
6126 nfs4_inc_and_copy_stateid(&lock
->lk_resp_stateid
, &lock_stp
->st_stid
);
6128 if (lock
->lk_reclaim
)
6129 nn
->somebody_reclaimed
= true;
6131 case FILE_LOCK_DEFERRED
:
6134 case -EAGAIN
: /* conflock holds conflicting lock */
6135 status
= nfserr_denied
;
6136 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6137 nfs4_set_lock_denied(conflock
, &lock
->lk_denied
);
6140 status
= nfserr_deadlock
;
6143 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err
);
6144 status
= nfserrno(err
);
6149 /* dequeue it if we queued it before */
6150 if (fl_flags
& FL_SLEEP
) {
6151 spin_lock(&nn
->blocked_locks_lock
);
6152 list_del_init(&nbl
->nbl_list
);
6153 list_del_init(&nbl
->nbl_lru
);
6154 spin_unlock(&nn
->blocked_locks_lock
);
6156 free_blocked_lock(nbl
);
6161 /* Bump seqid manually if the 4.0 replay owner is openowner */
6162 if (cstate
->replay_owner
&&
6163 cstate
->replay_owner
!= &lock_sop
->lo_owner
&&
6164 seqid_mutating_err(ntohl(status
)))
6165 lock_sop
->lo_owner
.so_seqid
++;
6168 * If this is a new, never-before-used stateid, and we are
6169 * returning an error, then just go ahead and release it.
6172 release_lock_stateid(lock_stp
);
6174 mutex_unlock(&lock_stp
->st_mutex
);
6176 nfs4_put_stid(&lock_stp
->st_stid
);
6179 nfs4_put_stid(&open_stp
->st_stid
);
6180 nfsd4_bump_seqid(cstate
, status
);
6182 locks_free_lock(conflock
);
6187 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6188 * so we do a temporary open here just to get an open file to pass to
6189 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6192 static __be32
nfsd_test_lock(struct svc_rqst
*rqstp
, struct svc_fh
*fhp
, struct file_lock
*lock
)
6195 __be32 err
= nfsd_open(rqstp
, fhp
, S_IFREG
, NFSD_MAY_READ
, &file
);
6197 err
= nfserrno(vfs_test_lock(file
, lock
));
6207 nfsd4_lockt(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
6208 union nfsd4_op_u
*u
)
6210 struct nfsd4_lockt
*lockt
= &u
->lockt
;
6211 struct file_lock
*file_lock
= NULL
;
6212 struct nfs4_lockowner
*lo
= NULL
;
6214 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6216 if (locks_in_grace(SVC_NET(rqstp
)))
6217 return nfserr_grace
;
6219 if (check_lock_length(lockt
->lt_offset
, lockt
->lt_length
))
6220 return nfserr_inval
;
6222 if (!nfsd4_has_session(cstate
)) {
6223 status
= lookup_clientid(&lockt
->lt_clientid
, cstate
, nn
);
6228 if ((status
= fh_verify(rqstp
, &cstate
->current_fh
, S_IFREG
, 0)))
6231 file_lock
= locks_alloc_lock();
6233 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6234 status
= nfserr_jukebox
;
6238 switch (lockt
->lt_type
) {
6241 file_lock
->fl_type
= F_RDLCK
;
6244 case NFS4_WRITEW_LT
:
6245 file_lock
->fl_type
= F_WRLCK
;
6248 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6249 status
= nfserr_inval
;
6253 lo
= find_lockowner_str(cstate
->clp
, &lockt
->lt_owner
);
6255 file_lock
->fl_owner
= (fl_owner_t
)lo
;
6256 file_lock
->fl_pid
= current
->tgid
;
6257 file_lock
->fl_flags
= FL_POSIX
;
6259 file_lock
->fl_start
= lockt
->lt_offset
;
6260 file_lock
->fl_end
= last_byte_offset(lockt
->lt_offset
, lockt
->lt_length
);
6262 nfs4_transform_lock_offset(file_lock
);
6264 status
= nfsd_test_lock(rqstp
, &cstate
->current_fh
, file_lock
);
6268 if (file_lock
->fl_type
!= F_UNLCK
) {
6269 status
= nfserr_denied
;
6270 nfs4_set_lock_denied(file_lock
, &lockt
->lt_denied
);
6274 nfs4_put_stateowner(&lo
->lo_owner
);
6276 locks_free_lock(file_lock
);
6281 nfsd4_locku(struct svc_rqst
*rqstp
, struct nfsd4_compound_state
*cstate
,
6282 union nfsd4_op_u
*u
)
6284 struct nfsd4_locku
*locku
= &u
->locku
;
6285 struct nfs4_ol_stateid
*stp
;
6286 struct file
*filp
= NULL
;
6287 struct file_lock
*file_lock
= NULL
;
6290 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6292 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6293 (long long) locku
->lu_offset
,
6294 (long long) locku
->lu_length
);
6296 if (check_lock_length(locku
->lu_offset
, locku
->lu_length
))
6297 return nfserr_inval
;
6299 status
= nfs4_preprocess_seqid_op(cstate
, locku
->lu_seqid
,
6300 &locku
->lu_stateid
, NFS4_LOCK_STID
,
6304 filp
= find_any_file(stp
->st_stid
.sc_file
);
6306 status
= nfserr_lock_range
;
6309 file_lock
= locks_alloc_lock();
6311 dprintk("NFSD: %s: unable to allocate lock!\n", __func__
);
6312 status
= nfserr_jukebox
;
6316 file_lock
->fl_type
= F_UNLCK
;
6317 file_lock
->fl_owner
= (fl_owner_t
)lockowner(nfs4_get_stateowner(stp
->st_stateowner
));
6318 file_lock
->fl_pid
= current
->tgid
;
6319 file_lock
->fl_file
= filp
;
6320 file_lock
->fl_flags
= FL_POSIX
;
6321 file_lock
->fl_lmops
= &nfsd_posix_mng_ops
;
6322 file_lock
->fl_start
= locku
->lu_offset
;
6324 file_lock
->fl_end
= last_byte_offset(locku
->lu_offset
,
6326 nfs4_transform_lock_offset(file_lock
);
6328 err
= vfs_lock_file(filp
, F_SETLK
, file_lock
, NULL
);
6330 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6333 nfs4_inc_and_copy_stateid(&locku
->lu_stateid
, &stp
->st_stid
);
6337 mutex_unlock(&stp
->st_mutex
);
6338 nfs4_put_stid(&stp
->st_stid
);
6340 nfsd4_bump_seqid(cstate
, status
);
6342 locks_free_lock(file_lock
);
6346 status
= nfserrno(err
);
6352 * true: locks held by lockowner
6353 * false: no locks held by lockowner
6356 check_for_locks(struct nfs4_file
*fp
, struct nfs4_lockowner
*lowner
)
6358 struct file_lock
*fl
;
6360 struct file
*filp
= find_any_file(fp
);
6361 struct inode
*inode
;
6362 struct file_lock_context
*flctx
;
6365 /* Any valid lock stateid should have some sort of access */
6370 inode
= locks_inode(filp
);
6371 flctx
= inode
->i_flctx
;
6373 if (flctx
&& !list_empty_careful(&flctx
->flc_posix
)) {
6374 spin_lock(&flctx
->flc_lock
);
6375 list_for_each_entry(fl
, &flctx
->flc_posix
, fl_list
) {
6376 if (fl
->fl_owner
== (fl_owner_t
)lowner
) {
6381 spin_unlock(&flctx
->flc_lock
);
6388 nfsd4_release_lockowner(struct svc_rqst
*rqstp
,
6389 struct nfsd4_compound_state
*cstate
,
6390 union nfsd4_op_u
*u
)
6392 struct nfsd4_release_lockowner
*rlockowner
= &u
->release_lockowner
;
6393 clientid_t
*clid
= &rlockowner
->rl_clientid
;
6394 struct nfs4_stateowner
*sop
;
6395 struct nfs4_lockowner
*lo
= NULL
;
6396 struct nfs4_ol_stateid
*stp
;
6397 struct xdr_netobj
*owner
= &rlockowner
->rl_owner
;
6398 unsigned int hashval
= ownerstr_hashval(owner
);
6400 struct nfsd_net
*nn
= net_generic(SVC_NET(rqstp
), nfsd_net_id
);
6401 struct nfs4_client
*clp
;
6402 LIST_HEAD (reaplist
);
6404 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6405 clid
->cl_boot
, clid
->cl_id
);
6407 status
= lookup_clientid(clid
, cstate
, nn
);
6412 /* Find the matching lock stateowner */
6413 spin_lock(&clp
->cl_lock
);
6414 list_for_each_entry(sop
, &clp
->cl_ownerstr_hashtbl
[hashval
],
6417 if (sop
->so_is_open_owner
|| !same_owner_str(sop
, owner
))
6420 /* see if there are still any locks associated with it */
6421 lo
= lockowner(sop
);
6422 list_for_each_entry(stp
, &sop
->so_stateids
, st_perstateowner
) {
6423 if (check_for_locks(stp
->st_stid
.sc_file
, lo
)) {
6424 status
= nfserr_locks_held
;
6425 spin_unlock(&clp
->cl_lock
);
6430 nfs4_get_stateowner(sop
);
6434 spin_unlock(&clp
->cl_lock
);
6438 unhash_lockowner_locked(lo
);
6439 while (!list_empty(&lo
->lo_owner
.so_stateids
)) {
6440 stp
= list_first_entry(&lo
->lo_owner
.so_stateids
,
6441 struct nfs4_ol_stateid
,
6443 WARN_ON(!unhash_lock_stateid(stp
));
6444 put_ol_stateid_locked(stp
, &reaplist
);
6446 spin_unlock(&clp
->cl_lock
);
6447 free_ol_stateid_reaplist(&reaplist
);
6448 remove_blocked_locks(lo
);
6449 nfs4_put_stateowner(&lo
->lo_owner
);
6454 static inline struct nfs4_client_reclaim
*
6457 return kmalloc(sizeof(struct nfs4_client_reclaim
), GFP_KERNEL
);
6461 nfs4_has_reclaimed_state(const char *name
, struct nfsd_net
*nn
)
6463 struct nfs4_client_reclaim
*crp
;
6465 crp
= nfsd4_find_reclaim_client(name
, nn
);
6466 return (crp
&& crp
->cr_clp
);
6470 * failure => all reset bets are off, nfserr_no_grace...
6472 struct nfs4_client_reclaim
*
6473 nfs4_client_to_reclaim(const char *name
, struct nfsd_net
*nn
)
6475 unsigned int strhashval
;
6476 struct nfs4_client_reclaim
*crp
;
6478 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN
, name
);
6479 crp
= alloc_reclaim();
6481 strhashval
= clientstr_hashval(name
);
6482 INIT_LIST_HEAD(&crp
->cr_strhash
);
6483 list_add(&crp
->cr_strhash
, &nn
->reclaim_str_hashtbl
[strhashval
]);
6484 memcpy(crp
->cr_recdir
, name
, HEXDIR_LEN
);
6486 nn
->reclaim_str_hashtbl_size
++;
6492 nfs4_remove_reclaim_record(struct nfs4_client_reclaim
*crp
, struct nfsd_net
*nn
)
6494 list_del(&crp
->cr_strhash
);
6496 nn
->reclaim_str_hashtbl_size
--;
6500 nfs4_release_reclaim(struct nfsd_net
*nn
)
6502 struct nfs4_client_reclaim
*crp
= NULL
;
6505 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
6506 while (!list_empty(&nn
->reclaim_str_hashtbl
[i
])) {
6507 crp
= list_entry(nn
->reclaim_str_hashtbl
[i
].next
,
6508 struct nfs4_client_reclaim
, cr_strhash
);
6509 nfs4_remove_reclaim_record(crp
, nn
);
6512 WARN_ON_ONCE(nn
->reclaim_str_hashtbl_size
);
6516 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6517 struct nfs4_client_reclaim
*
6518 nfsd4_find_reclaim_client(const char *recdir
, struct nfsd_net
*nn
)
6520 unsigned int strhashval
;
6521 struct nfs4_client_reclaim
*crp
= NULL
;
6523 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir
);
6525 strhashval
= clientstr_hashval(recdir
);
6526 list_for_each_entry(crp
, &nn
->reclaim_str_hashtbl
[strhashval
], cr_strhash
) {
6527 if (same_name(crp
->cr_recdir
, recdir
)) {
6535 * Called from OPEN. Look for clientid in reclaim list.
6538 nfs4_check_open_reclaim(clientid_t
*clid
,
6539 struct nfsd4_compound_state
*cstate
,
6540 struct nfsd_net
*nn
)
6544 /* find clientid in conf_id_hashtbl */
6545 status
= lookup_clientid(clid
, cstate
, nn
);
6547 return nfserr_reclaim_bad
;
6549 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE
, &cstate
->clp
->cl_flags
))
6550 return nfserr_no_grace
;
6552 if (nfsd4_client_record_check(cstate
->clp
))
6553 return nfserr_reclaim_bad
;
6558 #ifdef CONFIG_NFSD_FAULT_INJECTION
6560 put_client(struct nfs4_client
*clp
)
6562 atomic_dec(&clp
->cl_refcount
);
6565 static struct nfs4_client
*
6566 nfsd_find_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6568 struct nfs4_client
*clp
;
6569 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6572 if (!nfsd_netns_ready(nn
))
6575 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6576 if (memcmp(&clp
->cl_addr
, addr
, addr_size
) == 0)
6583 nfsd_inject_print_clients(void)
6585 struct nfs4_client
*clp
;
6587 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6589 char buf
[INET6_ADDRSTRLEN
];
6591 if (!nfsd_netns_ready(nn
))
6594 spin_lock(&nn
->client_lock
);
6595 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6596 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6597 pr_info("NFS Client: %s\n", buf
);
6600 spin_unlock(&nn
->client_lock
);
6606 nfsd_inject_forget_client(struct sockaddr_storage
*addr
, size_t addr_size
)
6609 struct nfs4_client
*clp
;
6610 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6613 if (!nfsd_netns_ready(nn
))
6616 spin_lock(&nn
->client_lock
);
6617 clp
= nfsd_find_client(addr
, addr_size
);
6619 if (mark_client_expired_locked(clp
) == nfs_ok
)
6624 spin_unlock(&nn
->client_lock
);
6633 nfsd_inject_forget_clients(u64 max
)
6636 struct nfs4_client
*clp
, *next
;
6637 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6639 LIST_HEAD(reaplist
);
6641 if (!nfsd_netns_ready(nn
))
6644 spin_lock(&nn
->client_lock
);
6645 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
6646 if (mark_client_expired_locked(clp
) == nfs_ok
) {
6647 list_add(&clp
->cl_lru
, &reaplist
);
6648 if (max
!= 0 && ++count
>= max
)
6652 spin_unlock(&nn
->client_lock
);
6654 list_for_each_entry_safe(clp
, next
, &reaplist
, cl_lru
)
6660 static void nfsd_print_count(struct nfs4_client
*clp
, unsigned int count
,
6663 char buf
[INET6_ADDRSTRLEN
];
6664 rpc_ntop((struct sockaddr
*)&clp
->cl_addr
, buf
, sizeof(buf
));
6665 printk(KERN_INFO
"NFS Client: %s has %u %s\n", buf
, count
, type
);
6669 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid
*lst
,
6670 struct list_head
*collect
)
6672 struct nfs4_client
*clp
= lst
->st_stid
.sc_client
;
6673 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6679 lockdep_assert_held(&nn
->client_lock
);
6680 atomic_inc(&clp
->cl_refcount
);
6681 list_add(&lst
->st_locks
, collect
);
6684 static u64
nfsd_foreach_client_lock(struct nfs4_client
*clp
, u64 max
,
6685 struct list_head
*collect
,
6686 bool (*func
)(struct nfs4_ol_stateid
*))
6688 struct nfs4_openowner
*oop
;
6689 struct nfs4_ol_stateid
*stp
, *st_next
;
6690 struct nfs4_ol_stateid
*lst
, *lst_next
;
6693 spin_lock(&clp
->cl_lock
);
6694 list_for_each_entry(oop
, &clp
->cl_openowners
, oo_perclient
) {
6695 list_for_each_entry_safe(stp
, st_next
,
6696 &oop
->oo_owner
.so_stateids
, st_perstateowner
) {
6697 list_for_each_entry_safe(lst
, lst_next
,
6698 &stp
->st_locks
, st_locks
) {
6701 nfsd_inject_add_lock_to_list(lst
,
6706 * Despite the fact that these functions deal
6707 * with 64-bit integers for "count", we must
6708 * ensure that it doesn't blow up the
6709 * clp->cl_refcount. Throw a warning if we
6710 * start to approach INT_MAX here.
6712 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6719 spin_unlock(&clp
->cl_lock
);
6725 nfsd_collect_client_locks(struct nfs4_client
*clp
, struct list_head
*collect
,
6728 return nfsd_foreach_client_lock(clp
, max
, collect
, unhash_lock_stateid
);
6732 nfsd_print_client_locks(struct nfs4_client
*clp
)
6734 u64 count
= nfsd_foreach_client_lock(clp
, 0, NULL
, NULL
);
6735 nfsd_print_count(clp
, count
, "locked files");
6740 nfsd_inject_print_locks(void)
6742 struct nfs4_client
*clp
;
6744 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6747 if (!nfsd_netns_ready(nn
))
6750 spin_lock(&nn
->client_lock
);
6751 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6752 count
+= nfsd_print_client_locks(clp
);
6753 spin_unlock(&nn
->client_lock
);
6759 nfsd_reap_locks(struct list_head
*reaplist
)
6761 struct nfs4_client
*clp
;
6762 struct nfs4_ol_stateid
*stp
, *next
;
6764 list_for_each_entry_safe(stp
, next
, reaplist
, st_locks
) {
6765 list_del_init(&stp
->st_locks
);
6766 clp
= stp
->st_stid
.sc_client
;
6767 nfs4_put_stid(&stp
->st_stid
);
6773 nfsd_inject_forget_client_locks(struct sockaddr_storage
*addr
, size_t addr_size
)
6775 unsigned int count
= 0;
6776 struct nfs4_client
*clp
;
6777 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6779 LIST_HEAD(reaplist
);
6781 if (!nfsd_netns_ready(nn
))
6784 spin_lock(&nn
->client_lock
);
6785 clp
= nfsd_find_client(addr
, addr_size
);
6787 count
= nfsd_collect_client_locks(clp
, &reaplist
, 0);
6788 spin_unlock(&nn
->client_lock
);
6789 nfsd_reap_locks(&reaplist
);
6794 nfsd_inject_forget_locks(u64 max
)
6797 struct nfs4_client
*clp
;
6798 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6800 LIST_HEAD(reaplist
);
6802 if (!nfsd_netns_ready(nn
))
6805 spin_lock(&nn
->client_lock
);
6806 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6807 count
+= nfsd_collect_client_locks(clp
, &reaplist
, max
- count
);
6808 if (max
!= 0 && count
>= max
)
6811 spin_unlock(&nn
->client_lock
);
6812 nfsd_reap_locks(&reaplist
);
6817 nfsd_foreach_client_openowner(struct nfs4_client
*clp
, u64 max
,
6818 struct list_head
*collect
,
6819 void (*func
)(struct nfs4_openowner
*))
6821 struct nfs4_openowner
*oop
, *next
;
6822 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6826 lockdep_assert_held(&nn
->client_lock
);
6828 spin_lock(&clp
->cl_lock
);
6829 list_for_each_entry_safe(oop
, next
, &clp
->cl_openowners
, oo_perclient
) {
6833 atomic_inc(&clp
->cl_refcount
);
6834 list_add(&oop
->oo_perclient
, collect
);
6839 * Despite the fact that these functions deal with
6840 * 64-bit integers for "count", we must ensure that
6841 * it doesn't blow up the clp->cl_refcount. Throw a
6842 * warning if we start to approach INT_MAX here.
6844 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6848 spin_unlock(&clp
->cl_lock
);
6854 nfsd_print_client_openowners(struct nfs4_client
*clp
)
6856 u64 count
= nfsd_foreach_client_openowner(clp
, 0, NULL
, NULL
);
6858 nfsd_print_count(clp
, count
, "openowners");
6863 nfsd_collect_client_openowners(struct nfs4_client
*clp
,
6864 struct list_head
*collect
, u64 max
)
6866 return nfsd_foreach_client_openowner(clp
, max
, collect
,
6867 unhash_openowner_locked
);
6871 nfsd_inject_print_openowners(void)
6873 struct nfs4_client
*clp
;
6875 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6878 if (!nfsd_netns_ready(nn
))
6881 spin_lock(&nn
->client_lock
);
6882 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
6883 count
+= nfsd_print_client_openowners(clp
);
6884 spin_unlock(&nn
->client_lock
);
6890 nfsd_reap_openowners(struct list_head
*reaplist
)
6892 struct nfs4_client
*clp
;
6893 struct nfs4_openowner
*oop
, *next
;
6895 list_for_each_entry_safe(oop
, next
, reaplist
, oo_perclient
) {
6896 list_del_init(&oop
->oo_perclient
);
6897 clp
= oop
->oo_owner
.so_client
;
6898 release_openowner(oop
);
6904 nfsd_inject_forget_client_openowners(struct sockaddr_storage
*addr
,
6907 unsigned int count
= 0;
6908 struct nfs4_client
*clp
;
6909 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6911 LIST_HEAD(reaplist
);
6913 if (!nfsd_netns_ready(nn
))
6916 spin_lock(&nn
->client_lock
);
6917 clp
= nfsd_find_client(addr
, addr_size
);
6919 count
= nfsd_collect_client_openowners(clp
, &reaplist
, 0);
6920 spin_unlock(&nn
->client_lock
);
6921 nfsd_reap_openowners(&reaplist
);
6926 nfsd_inject_forget_openowners(u64 max
)
6929 struct nfs4_client
*clp
;
6930 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6932 LIST_HEAD(reaplist
);
6934 if (!nfsd_netns_ready(nn
))
6937 spin_lock(&nn
->client_lock
);
6938 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
6939 count
+= nfsd_collect_client_openowners(clp
, &reaplist
,
6941 if (max
!= 0 && count
>= max
)
6944 spin_unlock(&nn
->client_lock
);
6945 nfsd_reap_openowners(&reaplist
);
6949 static u64
nfsd_find_all_delegations(struct nfs4_client
*clp
, u64 max
,
6950 struct list_head
*victims
)
6952 struct nfs4_delegation
*dp
, *next
;
6953 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
6957 lockdep_assert_held(&nn
->client_lock
);
6959 spin_lock(&state_lock
);
6960 list_for_each_entry_safe(dp
, next
, &clp
->cl_delegations
, dl_perclnt
) {
6963 * It's not safe to mess with delegations that have a
6964 * non-zero dl_time. They might have already been broken
6965 * and could be processed by the laundromat outside of
6966 * the state_lock. Just leave them be.
6968 if (dp
->dl_time
!= 0)
6971 atomic_inc(&clp
->cl_refcount
);
6972 WARN_ON(!unhash_delegation_locked(dp
));
6973 list_add(&dp
->dl_recall_lru
, victims
);
6977 * Despite the fact that these functions deal with
6978 * 64-bit integers for "count", we must ensure that
6979 * it doesn't blow up the clp->cl_refcount. Throw a
6980 * warning if we start to approach INT_MAX here.
6982 WARN_ON_ONCE(count
== (INT_MAX
/ 2));
6986 spin_unlock(&state_lock
);
6991 nfsd_print_client_delegations(struct nfs4_client
*clp
)
6993 u64 count
= nfsd_find_all_delegations(clp
, 0, NULL
);
6995 nfsd_print_count(clp
, count
, "delegations");
7000 nfsd_inject_print_delegations(void)
7002 struct nfs4_client
*clp
;
7004 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7007 if (!nfsd_netns_ready(nn
))
7010 spin_lock(&nn
->client_lock
);
7011 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
)
7012 count
+= nfsd_print_client_delegations(clp
);
7013 spin_unlock(&nn
->client_lock
);
7019 nfsd_forget_delegations(struct list_head
*reaplist
)
7021 struct nfs4_client
*clp
;
7022 struct nfs4_delegation
*dp
, *next
;
7024 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
7025 list_del_init(&dp
->dl_recall_lru
);
7026 clp
= dp
->dl_stid
.sc_client
;
7027 revoke_delegation(dp
);
7033 nfsd_inject_forget_client_delegations(struct sockaddr_storage
*addr
,
7037 struct nfs4_client
*clp
;
7038 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7040 LIST_HEAD(reaplist
);
7042 if (!nfsd_netns_ready(nn
))
7045 spin_lock(&nn
->client_lock
);
7046 clp
= nfsd_find_client(addr
, addr_size
);
7048 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
7049 spin_unlock(&nn
->client_lock
);
7051 nfsd_forget_delegations(&reaplist
);
7056 nfsd_inject_forget_delegations(u64 max
)
7059 struct nfs4_client
*clp
;
7060 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7062 LIST_HEAD(reaplist
);
7064 if (!nfsd_netns_ready(nn
))
7067 spin_lock(&nn
->client_lock
);
7068 list_for_each_entry(clp
, &nn
->client_lru
, cl_lru
) {
7069 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
7070 if (max
!= 0 && count
>= max
)
7073 spin_unlock(&nn
->client_lock
);
7074 nfsd_forget_delegations(&reaplist
);
7079 nfsd_recall_delegations(struct list_head
*reaplist
)
7081 struct nfs4_client
*clp
;
7082 struct nfs4_delegation
*dp
, *next
;
7084 list_for_each_entry_safe(dp
, next
, reaplist
, dl_recall_lru
) {
7085 list_del_init(&dp
->dl_recall_lru
);
7086 clp
= dp
->dl_stid
.sc_client
;
7088 * We skipped all entries that had a zero dl_time before,
7089 * so we can now reset the dl_time back to 0. If a delegation
7090 * break comes in now, then it won't make any difference since
7091 * we're recalling it either way.
7093 spin_lock(&state_lock
);
7095 spin_unlock(&state_lock
);
7096 nfsd_break_one_deleg(dp
);
7102 nfsd_inject_recall_client_delegations(struct sockaddr_storage
*addr
,
7106 struct nfs4_client
*clp
;
7107 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7109 LIST_HEAD(reaplist
);
7111 if (!nfsd_netns_ready(nn
))
7114 spin_lock(&nn
->client_lock
);
7115 clp
= nfsd_find_client(addr
, addr_size
);
7117 count
= nfsd_find_all_delegations(clp
, 0, &reaplist
);
7118 spin_unlock(&nn
->client_lock
);
7120 nfsd_recall_delegations(&reaplist
);
7125 nfsd_inject_recall_delegations(u64 max
)
7128 struct nfs4_client
*clp
, *next
;
7129 struct nfsd_net
*nn
= net_generic(current
->nsproxy
->net_ns
,
7131 LIST_HEAD(reaplist
);
7133 if (!nfsd_netns_ready(nn
))
7136 spin_lock(&nn
->client_lock
);
7137 list_for_each_entry_safe(clp
, next
, &nn
->client_lru
, cl_lru
) {
7138 count
+= nfsd_find_all_delegations(clp
, max
- count
, &reaplist
);
7139 if (max
!= 0 && ++count
>= max
)
7142 spin_unlock(&nn
->client_lock
);
7143 nfsd_recall_delegations(&reaplist
);
7146 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7149 * Since the lifetime of a delegation isn't limited to that of an open, a
7150 * client may quite reasonably hang on to a delegation as long as it has
7151 * the inode cached. This becomes an obvious problem the first time a
7152 * client's inode cache approaches the size of the server's total memory.
7154 * For now we avoid this problem by imposing a hard limit on the number
7155 * of delegations, which varies according to the server's memory size.
7158 set_max_delegations(void)
7161 * Allow at most 4 delegations per megabyte of RAM. Quick
7162 * estimates suggest that in the worst case (where every delegation
7163 * is for a different inode), a delegation could take about 1.5K,
7164 * giving a worst case usage of about 6% of memory.
7166 max_delegations
= nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT
);
7169 static int nfs4_state_create_net(struct net
*net
)
7171 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7174 nn
->conf_id_hashtbl
= kmalloc_array(CLIENT_HASH_SIZE
,
7175 sizeof(struct list_head
),
7177 if (!nn
->conf_id_hashtbl
)
7179 nn
->unconf_id_hashtbl
= kmalloc_array(CLIENT_HASH_SIZE
,
7180 sizeof(struct list_head
),
7182 if (!nn
->unconf_id_hashtbl
)
7184 nn
->sessionid_hashtbl
= kmalloc_array(SESSION_HASH_SIZE
,
7185 sizeof(struct list_head
),
7187 if (!nn
->sessionid_hashtbl
)
7190 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7191 INIT_LIST_HEAD(&nn
->conf_id_hashtbl
[i
]);
7192 INIT_LIST_HEAD(&nn
->unconf_id_hashtbl
[i
]);
7194 for (i
= 0; i
< SESSION_HASH_SIZE
; i
++)
7195 INIT_LIST_HEAD(&nn
->sessionid_hashtbl
[i
]);
7196 nn
->conf_name_tree
= RB_ROOT
;
7197 nn
->unconf_name_tree
= RB_ROOT
;
7198 nn
->boot_time
= get_seconds();
7199 nn
->grace_ended
= false;
7200 nn
->nfsd4_manager
.block_opens
= true;
7201 INIT_LIST_HEAD(&nn
->nfsd4_manager
.list
);
7202 INIT_LIST_HEAD(&nn
->client_lru
);
7203 INIT_LIST_HEAD(&nn
->close_lru
);
7204 INIT_LIST_HEAD(&nn
->del_recall_lru
);
7205 spin_lock_init(&nn
->client_lock
);
7206 spin_lock_init(&nn
->s2s_cp_lock
);
7207 idr_init(&nn
->s2s_cp_stateids
);
7209 spin_lock_init(&nn
->blocked_locks_lock
);
7210 INIT_LIST_HEAD(&nn
->blocked_locks_lru
);
7212 INIT_DELAYED_WORK(&nn
->laundromat_work
, laundromat_main
);
7218 kfree(nn
->unconf_id_hashtbl
);
7220 kfree(nn
->conf_id_hashtbl
);
7226 nfs4_state_destroy_net(struct net
*net
)
7229 struct nfs4_client
*clp
= NULL
;
7230 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7232 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7233 while (!list_empty(&nn
->conf_id_hashtbl
[i
])) {
7234 clp
= list_entry(nn
->conf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
7235 destroy_client(clp
);
7239 WARN_ON(!list_empty(&nn
->blocked_locks_lru
));
7241 for (i
= 0; i
< CLIENT_HASH_SIZE
; i
++) {
7242 while (!list_empty(&nn
->unconf_id_hashtbl
[i
])) {
7243 clp
= list_entry(nn
->unconf_id_hashtbl
[i
].next
, struct nfs4_client
, cl_idhash
);
7244 destroy_client(clp
);
7248 kfree(nn
->sessionid_hashtbl
);
7249 kfree(nn
->unconf_id_hashtbl
);
7250 kfree(nn
->conf_id_hashtbl
);
7255 nfs4_state_start_net(struct net
*net
)
7257 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7260 ret
= nfs4_state_create_net(net
);
7263 locks_start_grace(net
, &nn
->nfsd4_manager
);
7264 nfsd4_client_tracking_init(net
);
7265 printk(KERN_INFO
"NFSD: starting %ld-second grace period (net %x)\n",
7266 nn
->nfsd4_grace
, net
->ns
.inum
);
7267 queue_delayed_work(laundry_wq
, &nn
->laundromat_work
, nn
->nfsd4_grace
* HZ
);
7271 /* initialization to perform when the nfsd service is started: */
7274 nfs4_state_start(void)
7278 laundry_wq
= alloc_workqueue("%s", WQ_UNBOUND
, 0, "nfsd4");
7279 if (laundry_wq
== NULL
) {
7283 ret
= nfsd4_create_callback_queue();
7285 goto out_free_laundry
;
7287 set_max_delegations();
7291 destroy_workqueue(laundry_wq
);
7297 nfs4_state_shutdown_net(struct net
*net
)
7299 struct nfs4_delegation
*dp
= NULL
;
7300 struct list_head
*pos
, *next
, reaplist
;
7301 struct nfsd_net
*nn
= net_generic(net
, nfsd_net_id
);
7303 cancel_delayed_work_sync(&nn
->laundromat_work
);
7304 locks_end_grace(&nn
->nfsd4_manager
);
7306 INIT_LIST_HEAD(&reaplist
);
7307 spin_lock(&state_lock
);
7308 list_for_each_safe(pos
, next
, &nn
->del_recall_lru
) {
7309 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
7310 WARN_ON(!unhash_delegation_locked(dp
));
7311 list_add(&dp
->dl_recall_lru
, &reaplist
);
7313 spin_unlock(&state_lock
);
7314 list_for_each_safe(pos
, next
, &reaplist
) {
7315 dp
= list_entry (pos
, struct nfs4_delegation
, dl_recall_lru
);
7316 list_del_init(&dp
->dl_recall_lru
);
7317 destroy_unhashed_deleg(dp
);
7320 nfsd4_client_tracking_exit(net
);
7321 nfs4_state_destroy_net(net
);
7325 nfs4_state_shutdown(void)
7327 destroy_workqueue(laundry_wq
);
7328 nfsd4_destroy_callback_queue();
7332 get_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
7334 if (HAS_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
) && CURRENT_STATEID(stateid
))
7335 memcpy(stateid
, &cstate
->current_stateid
, sizeof(stateid_t
));
7339 put_stateid(struct nfsd4_compound_state
*cstate
, stateid_t
*stateid
)
7341 if (cstate
->minorversion
) {
7342 memcpy(&cstate
->current_stateid
, stateid
, sizeof(stateid_t
));
7343 SET_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
7348 clear_current_stateid(struct nfsd4_compound_state
*cstate
)
7350 CLEAR_STATE_ID(cstate
, CURRENT_STATE_ID_FLAG
);
7354 * functions to set current state id
7357 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state
*cstate
,
7358 union nfsd4_op_u
*u
)
7360 put_stateid(cstate
, &u
->open_downgrade
.od_stateid
);
7364 nfsd4_set_openstateid(struct nfsd4_compound_state
*cstate
,
7365 union nfsd4_op_u
*u
)
7367 put_stateid(cstate
, &u
->open
.op_stateid
);
7371 nfsd4_set_closestateid(struct nfsd4_compound_state
*cstate
,
7372 union nfsd4_op_u
*u
)
7374 put_stateid(cstate
, &u
->close
.cl_stateid
);
7378 nfsd4_set_lockstateid(struct nfsd4_compound_state
*cstate
,
7379 union nfsd4_op_u
*u
)
7381 put_stateid(cstate
, &u
->lock
.lk_resp_stateid
);
7385 * functions to consume current state id
7389 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state
*cstate
,
7390 union nfsd4_op_u
*u
)
7392 get_stateid(cstate
, &u
->open_downgrade
.od_stateid
);
7396 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state
*cstate
,
7397 union nfsd4_op_u
*u
)
7399 get_stateid(cstate
, &u
->delegreturn
.dr_stateid
);
7403 nfsd4_get_freestateid(struct nfsd4_compound_state
*cstate
,
7404 union nfsd4_op_u
*u
)
7406 get_stateid(cstate
, &u
->free_stateid
.fr_stateid
);
7410 nfsd4_get_setattrstateid(struct nfsd4_compound_state
*cstate
,
7411 union nfsd4_op_u
*u
)
7413 get_stateid(cstate
, &u
->setattr
.sa_stateid
);
7417 nfsd4_get_closestateid(struct nfsd4_compound_state
*cstate
,
7418 union nfsd4_op_u
*u
)
7420 get_stateid(cstate
, &u
->close
.cl_stateid
);
7424 nfsd4_get_lockustateid(struct nfsd4_compound_state
*cstate
,
7425 union nfsd4_op_u
*u
)
7427 get_stateid(cstate
, &u
->locku
.lu_stateid
);
7431 nfsd4_get_readstateid(struct nfsd4_compound_state
*cstate
,
7432 union nfsd4_op_u
*u
)
7434 get_stateid(cstate
, &u
->read
.rd_stateid
);
7438 nfsd4_get_writestateid(struct nfsd4_compound_state
*cstate
,
7439 union nfsd4_op_u
*u
)
7441 get_stateid(cstate
, &u
->write
.wr_stateid
);