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>
45 #include <linux/string_helpers.h>
49 #include "current_stateid.h"
53 #include "filecache.h"
55 #define NFSDDBG_FACILITY NFSDDBG_PROC
57 #define all_ones {{~0,~0},~0}
58 static const stateid_t one_stateid = {
60 .si_opaque = all_ones,
62 static const stateid_t zero_stateid = {
65 static const stateid_t currentstateid = {
68 static const stateid_t close_stateid = {
69 .si_generation = 0xffffffffU,
72 static u64 current_sessionid = 1;
74 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
75 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
76 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
77 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
79 /* forward declarations */
80 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
81 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
82 void nfsd4_end_grace(struct nfsd_net *nn);
87 * Currently used for the del_recall_lru and file hash table. In an
88 * effort to decrease the scope of the client_mutex, this spinlock may
89 * eventually cover more:
91 static DEFINE_SPINLOCK(state_lock);
93 enum nfsd4_st_mutex_lock_subclass {
94 OPEN_STATEID_MUTEX = 0,
95 LOCK_STATEID_MUTEX = 1,
99 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
100 * the refcount on the open stateid to drop.
102 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
105 * A waitqueue where a writer to clients/#/ctl destroying a client can
106 * wait for cl_rpc_users to drop to 0 and then for the client to be
109 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
111 static struct kmem_cache *client_slab;
112 static struct kmem_cache *openowner_slab;
113 static struct kmem_cache *lockowner_slab;
114 static struct kmem_cache *file_slab;
115 static struct kmem_cache *stateid_slab;
116 static struct kmem_cache *deleg_slab;
117 static struct kmem_cache *odstate_slab;
119 static void free_session(struct nfsd4_session *);
121 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
122 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
124 static bool is_session_dead(struct nfsd4_session *ses)
126 return ses->se_flags & NFS4_SESSION_DEAD;
129 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
131 if (atomic_read(&ses->se_ref) > ref_held_by_me)
132 return nfserr_jukebox;
133 ses->se_flags |= NFS4_SESSION_DEAD;
137 static bool is_client_expired(struct nfs4_client *clp)
139 return clp->cl_time == 0;
142 static __be32 get_client_locked(struct nfs4_client *clp)
144 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
146 lockdep_assert_held(&nn->client_lock);
148 if (is_client_expired(clp))
149 return nfserr_expired;
150 atomic_inc(&clp->cl_rpc_users);
154 /* must be called under the client_lock */
156 renew_client_locked(struct nfs4_client *clp)
158 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
160 if (is_client_expired(clp)) {
162 printk("%s: client (clientid %08x/%08x) already expired\n",
164 clp->cl_clientid.cl_boot,
165 clp->cl_clientid.cl_id);
169 dprintk("renewing client (clientid %08x/%08x)\n",
170 clp->cl_clientid.cl_boot,
171 clp->cl_clientid.cl_id);
172 list_move_tail(&clp->cl_lru, &nn->client_lru);
173 clp->cl_time = get_seconds();
176 static void put_client_renew_locked(struct nfs4_client *clp)
178 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
180 lockdep_assert_held(&nn->client_lock);
182 if (!atomic_dec_and_test(&clp->cl_rpc_users))
184 if (!is_client_expired(clp))
185 renew_client_locked(clp);
187 wake_up_all(&expiry_wq);
190 static void put_client_renew(struct nfs4_client *clp)
192 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
194 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
196 if (!is_client_expired(clp))
197 renew_client_locked(clp);
199 wake_up_all(&expiry_wq);
200 spin_unlock(&nn->client_lock);
203 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
207 if (is_session_dead(ses))
208 return nfserr_badsession;
209 status = get_client_locked(ses->se_client);
212 atomic_inc(&ses->se_ref);
216 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
218 struct nfs4_client *clp = ses->se_client;
219 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
221 lockdep_assert_held(&nn->client_lock);
223 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
225 put_client_renew_locked(clp);
228 static void nfsd4_put_session(struct nfsd4_session *ses)
230 struct nfs4_client *clp = ses->se_client;
231 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
233 spin_lock(&nn->client_lock);
234 nfsd4_put_session_locked(ses);
235 spin_unlock(&nn->client_lock);
238 static struct nfsd4_blocked_lock *
239 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
242 struct nfsd4_blocked_lock *cur, *found = NULL;
244 spin_lock(&nn->blocked_locks_lock);
245 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
246 if (fh_match(fh, &cur->nbl_fh)) {
247 list_del_init(&cur->nbl_list);
248 list_del_init(&cur->nbl_lru);
253 spin_unlock(&nn->blocked_locks_lock);
255 locks_delete_block(&found->nbl_lock);
259 static struct nfsd4_blocked_lock *
260 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
263 struct nfsd4_blocked_lock *nbl;
265 nbl = find_blocked_lock(lo, fh, nn);
267 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
269 fh_copy_shallow(&nbl->nbl_fh, fh);
270 locks_init_lock(&nbl->nbl_lock);
271 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
272 &nfsd4_cb_notify_lock_ops,
273 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
280 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
282 locks_delete_block(&nbl->nbl_lock);
283 locks_release_private(&nbl->nbl_lock);
288 remove_blocked_locks(struct nfs4_lockowner *lo)
290 struct nfs4_client *clp = lo->lo_owner.so_client;
291 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
292 struct nfsd4_blocked_lock *nbl;
295 /* Dequeue all blocked locks */
296 spin_lock(&nn->blocked_locks_lock);
297 while (!list_empty(&lo->lo_blocked)) {
298 nbl = list_first_entry(&lo->lo_blocked,
299 struct nfsd4_blocked_lock,
301 list_del_init(&nbl->nbl_list);
302 list_move(&nbl->nbl_lru, &reaplist);
304 spin_unlock(&nn->blocked_locks_lock);
307 while (!list_empty(&reaplist)) {
308 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
310 list_del_init(&nbl->nbl_lru);
311 free_blocked_lock(nbl);
316 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
318 struct nfsd4_blocked_lock *nbl = container_of(cb,
319 struct nfsd4_blocked_lock, nbl_cb);
320 locks_delete_block(&nbl->nbl_lock);
324 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
327 * Since this is just an optimization, we don't try very hard if it
328 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
329 * just quit trying on anything else.
331 switch (task->tk_status) {
333 rpc_delay(task, 1 * HZ);
341 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
343 struct nfsd4_blocked_lock *nbl = container_of(cb,
344 struct nfsd4_blocked_lock, nbl_cb);
346 free_blocked_lock(nbl);
349 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
350 .prepare = nfsd4_cb_notify_lock_prepare,
351 .done = nfsd4_cb_notify_lock_done,
352 .release = nfsd4_cb_notify_lock_release,
355 static inline struct nfs4_stateowner *
356 nfs4_get_stateowner(struct nfs4_stateowner *sop)
358 atomic_inc(&sop->so_count);
363 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
365 return (sop->so_owner.len == owner->len) &&
366 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
369 static struct nfs4_openowner *
370 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
371 struct nfs4_client *clp)
373 struct nfs4_stateowner *so;
375 lockdep_assert_held(&clp->cl_lock);
377 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
379 if (!so->so_is_open_owner)
381 if (same_owner_str(so, &open->op_owner))
382 return openowner(nfs4_get_stateowner(so));
387 static struct nfs4_openowner *
388 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
389 struct nfs4_client *clp)
391 struct nfs4_openowner *oo;
393 spin_lock(&clp->cl_lock);
394 oo = find_openstateowner_str_locked(hashval, open, clp);
395 spin_unlock(&clp->cl_lock);
400 opaque_hashval(const void *ptr, int nbytes)
402 unsigned char *cptr = (unsigned char *) ptr;
412 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
414 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
416 kmem_cache_free(file_slab, fp);
420 put_nfs4_file(struct nfs4_file *fi)
422 might_lock(&state_lock);
424 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
425 hlist_del_rcu(&fi->fi_hash);
426 spin_unlock(&state_lock);
427 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
428 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
429 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
433 static struct nfsd_file *
434 __nfs4_get_fd(struct nfs4_file *f, int oflag)
436 if (f->fi_fds[oflag])
437 return nfsd_file_get(f->fi_fds[oflag]);
441 static struct nfsd_file *
442 find_writeable_file_locked(struct nfs4_file *f)
444 struct nfsd_file *ret;
446 lockdep_assert_held(&f->fi_lock);
448 ret = __nfs4_get_fd(f, O_WRONLY);
450 ret = __nfs4_get_fd(f, O_RDWR);
454 static struct nfsd_file *
455 find_writeable_file(struct nfs4_file *f)
457 struct nfsd_file *ret;
459 spin_lock(&f->fi_lock);
460 ret = find_writeable_file_locked(f);
461 spin_unlock(&f->fi_lock);
466 static struct nfsd_file *
467 find_readable_file_locked(struct nfs4_file *f)
469 struct nfsd_file *ret;
471 lockdep_assert_held(&f->fi_lock);
473 ret = __nfs4_get_fd(f, O_RDONLY);
475 ret = __nfs4_get_fd(f, O_RDWR);
479 static struct nfsd_file *
480 find_readable_file(struct nfs4_file *f)
482 struct nfsd_file *ret;
484 spin_lock(&f->fi_lock);
485 ret = find_readable_file_locked(f);
486 spin_unlock(&f->fi_lock);
492 find_any_file(struct nfs4_file *f)
494 struct nfsd_file *ret;
496 spin_lock(&f->fi_lock);
497 ret = __nfs4_get_fd(f, O_RDWR);
499 ret = __nfs4_get_fd(f, O_WRONLY);
501 ret = __nfs4_get_fd(f, O_RDONLY);
503 spin_unlock(&f->fi_lock);
507 static atomic_long_t num_delegations;
508 unsigned long max_delegations;
511 * Open owner state (share locks)
514 /* hash tables for lock and open owners */
515 #define OWNER_HASH_BITS 8
516 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
517 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
519 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
523 ret = opaque_hashval(ownername->data, ownername->len);
524 return ret & OWNER_HASH_MASK;
527 /* hash table for nfs4_file */
528 #define FILE_HASH_BITS 8
529 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
531 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
533 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
536 static unsigned int file_hashval(struct knfsd_fh *fh)
538 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
541 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
544 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
546 lockdep_assert_held(&fp->fi_lock);
548 if (access & NFS4_SHARE_ACCESS_WRITE)
549 atomic_inc(&fp->fi_access[O_WRONLY]);
550 if (access & NFS4_SHARE_ACCESS_READ)
551 atomic_inc(&fp->fi_access[O_RDONLY]);
555 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
557 lockdep_assert_held(&fp->fi_lock);
559 /* Does this access mode make sense? */
560 if (access & ~NFS4_SHARE_ACCESS_BOTH)
563 /* Does it conflict with a deny mode already set? */
564 if ((access & fp->fi_share_deny) != 0)
565 return nfserr_share_denied;
567 __nfs4_file_get_access(fp, access);
571 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
573 /* Common case is that there is no deny mode. */
575 /* Does this deny mode make sense? */
576 if (deny & ~NFS4_SHARE_DENY_BOTH)
579 if ((deny & NFS4_SHARE_DENY_READ) &&
580 atomic_read(&fp->fi_access[O_RDONLY]))
581 return nfserr_share_denied;
583 if ((deny & NFS4_SHARE_DENY_WRITE) &&
584 atomic_read(&fp->fi_access[O_WRONLY]))
585 return nfserr_share_denied;
590 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
592 might_lock(&fp->fi_lock);
594 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
595 struct nfsd_file *f1 = NULL;
596 struct nfsd_file *f2 = NULL;
598 swap(f1, fp->fi_fds[oflag]);
599 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
600 swap(f2, fp->fi_fds[O_RDWR]);
601 spin_unlock(&fp->fi_lock);
609 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
611 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
613 if (access & NFS4_SHARE_ACCESS_WRITE)
614 __nfs4_file_put_access(fp, O_WRONLY);
615 if (access & NFS4_SHARE_ACCESS_READ)
616 __nfs4_file_put_access(fp, O_RDONLY);
620 * Allocate a new open/delegation state counter. This is needed for
621 * pNFS for proper return on close semantics.
623 * Note that we only allocate it for pNFS-enabled exports, otherwise
624 * all pointers to struct nfs4_clnt_odstate are always NULL.
626 static struct nfs4_clnt_odstate *
627 alloc_clnt_odstate(struct nfs4_client *clp)
629 struct nfs4_clnt_odstate *co;
631 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
634 refcount_set(&co->co_odcount, 1);
640 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
642 struct nfs4_file *fp = co->co_file;
644 lockdep_assert_held(&fp->fi_lock);
645 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
649 get_clnt_odstate(struct nfs4_clnt_odstate *co)
652 refcount_inc(&co->co_odcount);
656 put_clnt_odstate(struct nfs4_clnt_odstate *co)
658 struct nfs4_file *fp;
664 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
665 list_del(&co->co_perfile);
666 spin_unlock(&fp->fi_lock);
668 nfsd4_return_all_file_layouts(co->co_client, fp);
669 kmem_cache_free(odstate_slab, co);
673 static struct nfs4_clnt_odstate *
674 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
676 struct nfs4_clnt_odstate *co;
677 struct nfs4_client *cl;
684 spin_lock(&fp->fi_lock);
685 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
686 if (co->co_client == cl) {
687 get_clnt_odstate(co);
693 hash_clnt_odstate_locked(new);
695 spin_unlock(&fp->fi_lock);
699 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
700 void (*sc_free)(struct nfs4_stid *))
702 struct nfs4_stid *stid;
705 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
709 idr_preload(GFP_KERNEL);
710 spin_lock(&cl->cl_lock);
711 /* Reserving 0 for start of file in nfsdfs "states" file: */
712 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
713 spin_unlock(&cl->cl_lock);
718 stid->sc_free = sc_free;
719 stid->sc_client = cl;
720 stid->sc_stateid.si_opaque.so_id = new_id;
721 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
722 /* Will be incremented before return to client: */
723 refcount_set(&stid->sc_count, 1);
724 spin_lock_init(&stid->sc_lock);
727 * It shouldn't be a problem to reuse an opaque stateid value.
728 * I don't think it is for 4.1. But with 4.0 I worry that, for
729 * example, a stray write retransmission could be accepted by
730 * the server when it should have been rejected. Therefore,
731 * adopt a trick from the sctp code to attempt to maximize the
732 * amount of time until an id is reused, by ensuring they always
733 * "increase" (mod INT_MAX):
737 kmem_cache_free(slab, stid);
742 * Create a unique stateid_t to represent each COPY.
744 int nfs4_init_cp_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
748 idr_preload(GFP_KERNEL);
749 spin_lock(&nn->s2s_cp_lock);
750 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, copy, 0, 0, GFP_NOWAIT);
751 spin_unlock(&nn->s2s_cp_lock);
755 copy->cp_stateid.si_opaque.so_id = new_id;
756 copy->cp_stateid.si_opaque.so_clid.cl_boot = nn->boot_time;
757 copy->cp_stateid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
761 void nfs4_free_cp_state(struct nfsd4_copy *copy)
765 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
766 spin_lock(&nn->s2s_cp_lock);
767 idr_remove(&nn->s2s_cp_stateids, copy->cp_stateid.si_opaque.so_id);
768 spin_unlock(&nn->s2s_cp_lock);
771 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
773 struct nfs4_stid *stid;
775 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
779 return openlockstateid(stid);
782 static void nfs4_free_deleg(struct nfs4_stid *stid)
784 kmem_cache_free(deleg_slab, stid);
785 atomic_long_dec(&num_delegations);
789 * When we recall a delegation, we should be careful not to hand it
790 * out again straight away.
791 * To ensure this we keep a pair of bloom filters ('new' and 'old')
792 * in which the filehandles of recalled delegations are "stored".
793 * If a filehandle appear in either filter, a delegation is blocked.
794 * When a delegation is recalled, the filehandle is stored in the "new"
796 * Every 30 seconds we swap the filters and clear the "new" one,
797 * unless both are empty of course.
799 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
800 * low 3 bytes as hash-table indices.
802 * 'blocked_delegations_lock', which is always taken in block_delegations(),
803 * is used to manage concurrent access. Testing does not need the lock
804 * except when swapping the two filters.
806 static DEFINE_SPINLOCK(blocked_delegations_lock);
807 static struct bloom_pair {
808 int entries, old_entries;
810 int new; /* index into 'set' */
811 DECLARE_BITMAP(set[2], 256);
812 } blocked_delegations;
814 static int delegation_blocked(struct knfsd_fh *fh)
817 struct bloom_pair *bd = &blocked_delegations;
819 if (bd->entries == 0)
821 if (seconds_since_boot() - bd->swap_time > 30) {
822 spin_lock(&blocked_delegations_lock);
823 if (seconds_since_boot() - bd->swap_time > 30) {
824 bd->entries -= bd->old_entries;
825 bd->old_entries = bd->entries;
826 memset(bd->set[bd->new], 0,
829 bd->swap_time = seconds_since_boot();
831 spin_unlock(&blocked_delegations_lock);
833 hash = jhash(&fh->fh_base, fh->fh_size, 0);
834 if (test_bit(hash&255, bd->set[0]) &&
835 test_bit((hash>>8)&255, bd->set[0]) &&
836 test_bit((hash>>16)&255, bd->set[0]))
839 if (test_bit(hash&255, bd->set[1]) &&
840 test_bit((hash>>8)&255, bd->set[1]) &&
841 test_bit((hash>>16)&255, bd->set[1]))
847 static void block_delegations(struct knfsd_fh *fh)
850 struct bloom_pair *bd = &blocked_delegations;
852 hash = jhash(&fh->fh_base, fh->fh_size, 0);
854 spin_lock(&blocked_delegations_lock);
855 __set_bit(hash&255, bd->set[bd->new]);
856 __set_bit((hash>>8)&255, bd->set[bd->new]);
857 __set_bit((hash>>16)&255, bd->set[bd->new]);
858 if (bd->entries == 0)
859 bd->swap_time = seconds_since_boot();
861 spin_unlock(&blocked_delegations_lock);
864 static struct nfs4_delegation *
865 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
866 struct svc_fh *current_fh,
867 struct nfs4_clnt_odstate *odstate)
869 struct nfs4_delegation *dp;
872 dprintk("NFSD alloc_init_deleg\n");
873 n = atomic_long_inc_return(&num_delegations);
874 if (n < 0 || n > max_delegations)
876 if (delegation_blocked(¤t_fh->fh_handle))
878 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
883 * delegation seqid's are never incremented. The 4.1 special
884 * meaning of seqid 0 isn't meaningful, really, but let's avoid
885 * 0 anyway just for consistency and use 1:
887 dp->dl_stid.sc_stateid.si_generation = 1;
888 INIT_LIST_HEAD(&dp->dl_perfile);
889 INIT_LIST_HEAD(&dp->dl_perclnt);
890 INIT_LIST_HEAD(&dp->dl_recall_lru);
891 dp->dl_clnt_odstate = odstate;
892 get_clnt_odstate(odstate);
893 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
895 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
896 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
898 dp->dl_stid.sc_file = fp;
901 atomic_long_dec(&num_delegations);
906 nfs4_put_stid(struct nfs4_stid *s)
908 struct nfs4_file *fp = s->sc_file;
909 struct nfs4_client *clp = s->sc_client;
911 might_lock(&clp->cl_lock);
913 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
914 wake_up_all(&close_wq);
917 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
918 spin_unlock(&clp->cl_lock);
925 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
927 stateid_t *src = &stid->sc_stateid;
929 spin_lock(&stid->sc_lock);
930 if (unlikely(++src->si_generation == 0))
931 src->si_generation = 1;
932 memcpy(dst, src, sizeof(*dst));
933 spin_unlock(&stid->sc_lock);
936 static void put_deleg_file(struct nfs4_file *fp)
938 struct nfsd_file *nf = NULL;
940 spin_lock(&fp->fi_lock);
941 if (--fp->fi_delegees == 0)
942 swap(nf, fp->fi_deleg_file);
943 spin_unlock(&fp->fi_lock);
949 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
951 struct nfs4_file *fp = dp->dl_stid.sc_file;
952 struct nfsd_file *nf = fp->fi_deleg_file;
954 WARN_ON_ONCE(!fp->fi_delegees);
956 vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
960 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
962 put_clnt_odstate(dp->dl_clnt_odstate);
963 nfs4_unlock_deleg_lease(dp);
964 nfs4_put_stid(&dp->dl_stid);
967 void nfs4_unhash_stid(struct nfs4_stid *s)
973 * nfs4_delegation_exists - Discover if this delegation already exists
974 * @clp: a pointer to the nfs4_client we're granting a delegation to
975 * @fp: a pointer to the nfs4_file we're granting a delegation on
978 * On success: true iff an existing delegation is found
982 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
984 struct nfs4_delegation *searchdp = NULL;
985 struct nfs4_client *searchclp = NULL;
987 lockdep_assert_held(&state_lock);
988 lockdep_assert_held(&fp->fi_lock);
990 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
991 searchclp = searchdp->dl_stid.sc_client;
992 if (clp == searchclp) {
1000 * hash_delegation_locked - Add a delegation to the appropriate lists
1001 * @dp: a pointer to the nfs4_delegation we are adding.
1002 * @fp: a pointer to the nfs4_file we're granting a delegation on
1005 * On success: NULL if the delegation was successfully hashed.
1007 * On error: -EAGAIN if one was previously granted to this
1008 * nfs4_client for this nfs4_file. Delegation is not hashed.
1013 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1015 struct nfs4_client *clp = dp->dl_stid.sc_client;
1017 lockdep_assert_held(&state_lock);
1018 lockdep_assert_held(&fp->fi_lock);
1020 if (nfs4_delegation_exists(clp, fp))
1022 refcount_inc(&dp->dl_stid.sc_count);
1023 dp->dl_stid.sc_type = NFS4_DELEG_STID;
1024 list_add(&dp->dl_perfile, &fp->fi_delegations);
1025 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1030 unhash_delegation_locked(struct nfs4_delegation *dp)
1032 struct nfs4_file *fp = dp->dl_stid.sc_file;
1034 lockdep_assert_held(&state_lock);
1036 if (list_empty(&dp->dl_perfile))
1039 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1040 /* Ensure that deleg break won't try to requeue it */
1042 spin_lock(&fp->fi_lock);
1043 list_del_init(&dp->dl_perclnt);
1044 list_del_init(&dp->dl_recall_lru);
1045 list_del_init(&dp->dl_perfile);
1046 spin_unlock(&fp->fi_lock);
1050 static void destroy_delegation(struct nfs4_delegation *dp)
1054 spin_lock(&state_lock);
1055 unhashed = unhash_delegation_locked(dp);
1056 spin_unlock(&state_lock);
1058 destroy_unhashed_deleg(dp);
1061 static void revoke_delegation(struct nfs4_delegation *dp)
1063 struct nfs4_client *clp = dp->dl_stid.sc_client;
1065 WARN_ON(!list_empty(&dp->dl_recall_lru));
1067 if (clp->cl_minorversion) {
1068 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1069 refcount_inc(&dp->dl_stid.sc_count);
1070 spin_lock(&clp->cl_lock);
1071 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1072 spin_unlock(&clp->cl_lock);
1074 destroy_unhashed_deleg(dp);
1081 static unsigned int clientid_hashval(u32 id)
1083 return id & CLIENT_HASH_MASK;
1086 static unsigned int clientstr_hashval(struct xdr_netobj name)
1088 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1092 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1093 * st_{access,deny}_bmap field of the stateid, in order to track not
1094 * only what share bits are currently in force, but also what
1095 * combinations of share bits previous opens have used. This allows us
1096 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1097 * return an error if the client attempt to downgrade to a combination
1098 * of share bits not explicable by closing some of its previous opens.
1100 * XXX: This enforcement is actually incomplete, since we don't keep
1101 * track of access/deny bit combinations; so, e.g., we allow:
1103 * OPEN allow read, deny write
1104 * OPEN allow both, deny none
1105 * DOWNGRADE allow read, deny none
1107 * which we should reject.
1110 bmap_to_share_mode(unsigned long bmap) {
1112 unsigned int access = 0;
1114 for (i = 1; i < 4; i++) {
1115 if (test_bit(i, &bmap))
1121 /* set share access for a given stateid */
1123 set_access(u32 access, struct nfs4_ol_stateid *stp)
1125 unsigned char mask = 1 << access;
1127 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1128 stp->st_access_bmap |= mask;
1131 /* clear share access for a given stateid */
1133 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1135 unsigned char mask = 1 << access;
1137 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1138 stp->st_access_bmap &= ~mask;
1141 /* test whether a given stateid has access */
1143 test_access(u32 access, struct nfs4_ol_stateid *stp)
1145 unsigned char mask = 1 << access;
1147 return (bool)(stp->st_access_bmap & mask);
1150 /* set share deny for a given stateid */
1152 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1154 unsigned char mask = 1 << deny;
1156 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1157 stp->st_deny_bmap |= mask;
1160 /* clear share deny for a given stateid */
1162 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1164 unsigned char mask = 1 << deny;
1166 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1167 stp->st_deny_bmap &= ~mask;
1170 /* test whether a given stateid is denying specific access */
1172 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1174 unsigned char mask = 1 << deny;
1176 return (bool)(stp->st_deny_bmap & mask);
1179 static int nfs4_access_to_omode(u32 access)
1181 switch (access & NFS4_SHARE_ACCESS_BOTH) {
1182 case NFS4_SHARE_ACCESS_READ:
1184 case NFS4_SHARE_ACCESS_WRITE:
1186 case NFS4_SHARE_ACCESS_BOTH:
1194 * A stateid that had a deny mode associated with it is being released
1195 * or downgraded. Recalculate the deny mode on the file.
1198 recalculate_deny_mode(struct nfs4_file *fp)
1200 struct nfs4_ol_stateid *stp;
1202 spin_lock(&fp->fi_lock);
1203 fp->fi_share_deny = 0;
1204 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1205 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1206 spin_unlock(&fp->fi_lock);
1210 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1213 bool change = false;
1215 for (i = 1; i < 4; i++) {
1216 if ((i & deny) != i) {
1222 /* Recalculate per-file deny mode if there was a change */
1224 recalculate_deny_mode(stp->st_stid.sc_file);
1227 /* release all access and file references for a given stateid */
1229 release_all_access(struct nfs4_ol_stateid *stp)
1232 struct nfs4_file *fp = stp->st_stid.sc_file;
1234 if (fp && stp->st_deny_bmap != 0)
1235 recalculate_deny_mode(fp);
1237 for (i = 1; i < 4; i++) {
1238 if (test_access(i, stp))
1239 nfs4_file_put_access(stp->st_stid.sc_file, i);
1240 clear_access(i, stp);
1244 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1246 kfree(sop->so_owner.data);
1247 sop->so_ops->so_free(sop);
1250 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1252 struct nfs4_client *clp = sop->so_client;
1254 might_lock(&clp->cl_lock);
1256 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1258 sop->so_ops->so_unhash(sop);
1259 spin_unlock(&clp->cl_lock);
1260 nfs4_free_stateowner(sop);
1263 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1265 struct nfs4_file *fp = stp->st_stid.sc_file;
1267 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1269 if (list_empty(&stp->st_perfile))
1272 spin_lock(&fp->fi_lock);
1273 list_del_init(&stp->st_perfile);
1274 spin_unlock(&fp->fi_lock);
1275 list_del(&stp->st_perstateowner);
1279 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1281 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1283 put_clnt_odstate(stp->st_clnt_odstate);
1284 release_all_access(stp);
1285 if (stp->st_stateowner)
1286 nfs4_put_stateowner(stp->st_stateowner);
1287 kmem_cache_free(stateid_slab, stid);
1290 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1292 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1293 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1294 struct nfsd_file *nf;
1296 nf = find_any_file(stp->st_stid.sc_file);
1298 get_file(nf->nf_file);
1299 filp_close(nf->nf_file, (fl_owner_t)lo);
1302 nfs4_free_ol_stateid(stid);
1306 * Put the persistent reference to an already unhashed generic stateid, while
1307 * holding the cl_lock. If it's the last reference, then put it onto the
1308 * reaplist for later destruction.
1310 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1311 struct list_head *reaplist)
1313 struct nfs4_stid *s = &stp->st_stid;
1314 struct nfs4_client *clp = s->sc_client;
1316 lockdep_assert_held(&clp->cl_lock);
1318 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1320 if (!refcount_dec_and_test(&s->sc_count)) {
1321 wake_up_all(&close_wq);
1325 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1326 list_add(&stp->st_locks, reaplist);
1329 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1331 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1333 list_del_init(&stp->st_locks);
1334 nfs4_unhash_stid(&stp->st_stid);
1335 return unhash_ol_stateid(stp);
1338 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1340 struct nfs4_client *clp = stp->st_stid.sc_client;
1343 spin_lock(&clp->cl_lock);
1344 unhashed = unhash_lock_stateid(stp);
1345 spin_unlock(&clp->cl_lock);
1347 nfs4_put_stid(&stp->st_stid);
1350 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1352 struct nfs4_client *clp = lo->lo_owner.so_client;
1354 lockdep_assert_held(&clp->cl_lock);
1356 list_del_init(&lo->lo_owner.so_strhash);
1360 * Free a list of generic stateids that were collected earlier after being
1364 free_ol_stateid_reaplist(struct list_head *reaplist)
1366 struct nfs4_ol_stateid *stp;
1367 struct nfs4_file *fp;
1371 while (!list_empty(reaplist)) {
1372 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1374 list_del(&stp->st_locks);
1375 fp = stp->st_stid.sc_file;
1376 stp->st_stid.sc_free(&stp->st_stid);
1382 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1383 struct list_head *reaplist)
1385 struct nfs4_ol_stateid *stp;
1387 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1389 while (!list_empty(&open_stp->st_locks)) {
1390 stp = list_entry(open_stp->st_locks.next,
1391 struct nfs4_ol_stateid, st_locks);
1392 WARN_ON(!unhash_lock_stateid(stp));
1393 put_ol_stateid_locked(stp, reaplist);
1397 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1398 struct list_head *reaplist)
1402 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1404 unhashed = unhash_ol_stateid(stp);
1405 release_open_stateid_locks(stp, reaplist);
1409 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1411 LIST_HEAD(reaplist);
1413 spin_lock(&stp->st_stid.sc_client->cl_lock);
1414 if (unhash_open_stateid(stp, &reaplist))
1415 put_ol_stateid_locked(stp, &reaplist);
1416 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1417 free_ol_stateid_reaplist(&reaplist);
1420 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1422 struct nfs4_client *clp = oo->oo_owner.so_client;
1424 lockdep_assert_held(&clp->cl_lock);
1426 list_del_init(&oo->oo_owner.so_strhash);
1427 list_del_init(&oo->oo_perclient);
1430 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1432 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1434 struct nfs4_ol_stateid *s;
1436 spin_lock(&nn->client_lock);
1437 s = oo->oo_last_closed_stid;
1439 list_del_init(&oo->oo_close_lru);
1440 oo->oo_last_closed_stid = NULL;
1442 spin_unlock(&nn->client_lock);
1444 nfs4_put_stid(&s->st_stid);
1447 static void release_openowner(struct nfs4_openowner *oo)
1449 struct nfs4_ol_stateid *stp;
1450 struct nfs4_client *clp = oo->oo_owner.so_client;
1451 struct list_head reaplist;
1453 INIT_LIST_HEAD(&reaplist);
1455 spin_lock(&clp->cl_lock);
1456 unhash_openowner_locked(oo);
1457 while (!list_empty(&oo->oo_owner.so_stateids)) {
1458 stp = list_first_entry(&oo->oo_owner.so_stateids,
1459 struct nfs4_ol_stateid, st_perstateowner);
1460 if (unhash_open_stateid(stp, &reaplist))
1461 put_ol_stateid_locked(stp, &reaplist);
1463 spin_unlock(&clp->cl_lock);
1464 free_ol_stateid_reaplist(&reaplist);
1465 release_last_closed_stateid(oo);
1466 nfs4_put_stateowner(&oo->oo_owner);
1470 hash_sessionid(struct nfs4_sessionid *sessionid)
1472 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1474 return sid->sequence % SESSION_HASH_SIZE;
1477 #ifdef CONFIG_SUNRPC_DEBUG
1479 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1481 u32 *ptr = (u32 *)(&sessionid->data[0]);
1482 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1486 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1492 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1493 * won't be used for replay.
1495 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1497 struct nfs4_stateowner *so = cstate->replay_owner;
1499 if (nfserr == nfserr_replay_me)
1502 if (!seqid_mutating_err(ntohl(nfserr))) {
1503 nfsd4_cstate_clear_replay(cstate);
1508 if (so->so_is_open_owner)
1509 release_last_closed_stateid(openowner(so));
1515 gen_sessionid(struct nfsd4_session *ses)
1517 struct nfs4_client *clp = ses->se_client;
1518 struct nfsd4_sessionid *sid;
1520 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1521 sid->clientid = clp->cl_clientid;
1522 sid->sequence = current_sessionid++;
1527 * The protocol defines ca_maxresponssize_cached to include the size of
1528 * the rpc header, but all we need to cache is the data starting after
1529 * the end of the initial SEQUENCE operation--the rest we regenerate
1530 * each time. Therefore we can advertise a ca_maxresponssize_cached
1531 * value that is the number of bytes in our cache plus a few additional
1532 * bytes. In order to stay on the safe side, and not promise more than
1533 * we can cache, those additional bytes must be the minimum possible: 24
1534 * bytes of rpc header (xid through accept state, with AUTH_NULL
1535 * verifier), 12 for the compound header (with zero-length tag), and 44
1536 * for the SEQUENCE op response:
1538 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1541 free_session_slots(struct nfsd4_session *ses)
1545 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1546 free_svc_cred(&ses->se_slots[i]->sl_cred);
1547 kfree(ses->se_slots[i]);
1552 * We don't actually need to cache the rpc and session headers, so we
1553 * can allocate a little less for each slot:
1555 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1559 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1562 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1563 return size + sizeof(struct nfsd4_slot);
1567 * XXX: If we run out of reserved DRC memory we could (up to a point)
1568 * re-negotiate active sessions and reduce their slot usage to make
1569 * room for new connections. For now we just fail the create session.
1571 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1573 u32 slotsize = slot_bytes(ca);
1574 u32 num = ca->maxreqs;
1575 unsigned long avail, total_avail;
1576 unsigned int scale_factor;
1578 spin_lock(&nfsd_drc_lock);
1579 if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1580 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1582 /* We have handed out more space than we chose in
1583 * set_max_drc() to allow. That isn't really a
1584 * problem as long as that doesn't make us think we
1585 * have lots more due to integer overflow.
1588 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1590 * Never use more than a fraction of the remaining memory,
1591 * unless it's the only way to give this client a slot.
1592 * The chosen fraction is either 1/8 or 1/number of threads,
1593 * whichever is smaller. This ensures there are adequate
1594 * slots to support multiple clients per thread.
1595 * Give the client one slot even if that would require
1596 * over-allocation--it is better than failure.
1598 scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1600 avail = clamp_t(unsigned long, avail, slotsize,
1601 total_avail/scale_factor);
1602 num = min_t(int, num, avail / slotsize);
1603 num = max_t(int, num, 1);
1604 nfsd_drc_mem_used += num * slotsize;
1605 spin_unlock(&nfsd_drc_lock);
1610 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1612 int slotsize = slot_bytes(ca);
1614 spin_lock(&nfsd_drc_lock);
1615 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1616 spin_unlock(&nfsd_drc_lock);
1619 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1620 struct nfsd4_channel_attrs *battrs)
1622 int numslots = fattrs->maxreqs;
1623 int slotsize = slot_bytes(fattrs);
1624 struct nfsd4_session *new;
1627 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1628 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1629 mem = numslots * sizeof(struct nfsd4_slot *);
1631 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1634 /* allocate each struct nfsd4_slot and data cache in one piece */
1635 for (i = 0; i < numslots; i++) {
1636 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1637 if (!new->se_slots[i])
1641 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1642 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1647 kfree(new->se_slots[i]);
1652 static void free_conn(struct nfsd4_conn *c)
1654 svc_xprt_put(c->cn_xprt);
1658 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1660 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1661 struct nfs4_client *clp = c->cn_session->se_client;
1663 spin_lock(&clp->cl_lock);
1664 if (!list_empty(&c->cn_persession)) {
1665 list_del(&c->cn_persession);
1668 nfsd4_probe_callback(clp);
1669 spin_unlock(&clp->cl_lock);
1672 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1674 struct nfsd4_conn *conn;
1676 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1679 svc_xprt_get(rqstp->rq_xprt);
1680 conn->cn_xprt = rqstp->rq_xprt;
1681 conn->cn_flags = flags;
1682 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1686 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1688 conn->cn_session = ses;
1689 list_add(&conn->cn_persession, &ses->se_conns);
1692 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1694 struct nfs4_client *clp = ses->se_client;
1696 spin_lock(&clp->cl_lock);
1697 __nfsd4_hash_conn(conn, ses);
1698 spin_unlock(&clp->cl_lock);
1701 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1703 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1704 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1707 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1711 nfsd4_hash_conn(conn, ses);
1712 ret = nfsd4_register_conn(conn);
1714 /* oops; xprt is already down: */
1715 nfsd4_conn_lost(&conn->cn_xpt_user);
1716 /* We may have gained or lost a callback channel: */
1717 nfsd4_probe_callback_sync(ses->se_client);
1720 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1722 u32 dir = NFS4_CDFC4_FORE;
1724 if (cses->flags & SESSION4_BACK_CHAN)
1725 dir |= NFS4_CDFC4_BACK;
1726 return alloc_conn(rqstp, dir);
1729 /* must be called under client_lock */
1730 static void nfsd4_del_conns(struct nfsd4_session *s)
1732 struct nfs4_client *clp = s->se_client;
1733 struct nfsd4_conn *c;
1735 spin_lock(&clp->cl_lock);
1736 while (!list_empty(&s->se_conns)) {
1737 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1738 list_del_init(&c->cn_persession);
1739 spin_unlock(&clp->cl_lock);
1741 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1744 spin_lock(&clp->cl_lock);
1746 spin_unlock(&clp->cl_lock);
1749 static void __free_session(struct nfsd4_session *ses)
1751 free_session_slots(ses);
1755 static void free_session(struct nfsd4_session *ses)
1757 nfsd4_del_conns(ses);
1758 nfsd4_put_drc_mem(&ses->se_fchannel);
1759 __free_session(ses);
1762 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1765 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1767 new->se_client = clp;
1770 INIT_LIST_HEAD(&new->se_conns);
1772 new->se_cb_seq_nr = 1;
1773 new->se_flags = cses->flags;
1774 new->se_cb_prog = cses->callback_prog;
1775 new->se_cb_sec = cses->cb_sec;
1776 atomic_set(&new->se_ref, 0);
1777 idx = hash_sessionid(&new->se_sessionid);
1778 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1779 spin_lock(&clp->cl_lock);
1780 list_add(&new->se_perclnt, &clp->cl_sessions);
1781 spin_unlock(&clp->cl_lock);
1784 struct sockaddr *sa = svc_addr(rqstp);
1786 * This is a little silly; with sessions there's no real
1787 * use for the callback address. Use the peer address
1788 * as a reasonable default for now, but consider fixing
1789 * the rpc client not to require an address in the
1792 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1793 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1797 /* caller must hold client_lock */
1798 static struct nfsd4_session *
1799 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1801 struct nfsd4_session *elem;
1803 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1805 lockdep_assert_held(&nn->client_lock);
1807 dump_sessionid(__func__, sessionid);
1808 idx = hash_sessionid(sessionid);
1809 /* Search in the appropriate list */
1810 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1811 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1812 NFS4_MAX_SESSIONID_LEN)) {
1817 dprintk("%s: session not found\n", __func__);
1821 static struct nfsd4_session *
1822 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1825 struct nfsd4_session *session;
1826 __be32 status = nfserr_badsession;
1828 session = __find_in_sessionid_hashtbl(sessionid, net);
1831 status = nfsd4_get_session_locked(session);
1839 /* caller must hold client_lock */
1841 unhash_session(struct nfsd4_session *ses)
1843 struct nfs4_client *clp = ses->se_client;
1844 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1846 lockdep_assert_held(&nn->client_lock);
1848 list_del(&ses->se_hash);
1849 spin_lock(&ses->se_client->cl_lock);
1850 list_del(&ses->se_perclnt);
1851 spin_unlock(&ses->se_client->cl_lock);
1854 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1856 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1859 * We're assuming the clid was not given out from a boot
1860 * precisely 2^32 (about 136 years) before this one. That seems
1861 * a safe assumption:
1863 if (clid->cl_boot == (u32)nn->boot_time)
1865 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1866 clid->cl_boot, clid->cl_id, nn->boot_time);
1871 * XXX Should we use a slab cache ?
1872 * This type of memory management is somewhat inefficient, but we use it
1873 * anyway since SETCLIENTID is not a common operation.
1875 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1877 struct nfs4_client *clp;
1880 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
1883 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
1884 if (clp->cl_name.data == NULL)
1886 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
1887 sizeof(struct list_head),
1889 if (!clp->cl_ownerstr_hashtbl)
1890 goto err_no_hashtbl;
1891 for (i = 0; i < OWNER_HASH_SIZE; i++)
1892 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1893 INIT_LIST_HEAD(&clp->cl_sessions);
1894 idr_init(&clp->cl_stateids);
1895 atomic_set(&clp->cl_rpc_users, 0);
1896 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1897 INIT_LIST_HEAD(&clp->cl_idhash);
1898 INIT_LIST_HEAD(&clp->cl_openowners);
1899 INIT_LIST_HEAD(&clp->cl_delegations);
1900 INIT_LIST_HEAD(&clp->cl_lru);
1901 INIT_LIST_HEAD(&clp->cl_revoked);
1902 #ifdef CONFIG_NFSD_PNFS
1903 INIT_LIST_HEAD(&clp->cl_lo_states);
1905 INIT_LIST_HEAD(&clp->async_copies);
1906 spin_lock_init(&clp->async_lock);
1907 spin_lock_init(&clp->cl_lock);
1908 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1911 kfree(clp->cl_name.data);
1913 kmem_cache_free(client_slab, clp);
1917 static void __free_client(struct kref *k)
1919 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
1920 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
1922 free_svc_cred(&clp->cl_cred);
1923 kfree(clp->cl_ownerstr_hashtbl);
1924 kfree(clp->cl_name.data);
1925 kfree(clp->cl_nii_domain.data);
1926 kfree(clp->cl_nii_name.data);
1927 idr_destroy(&clp->cl_stateids);
1928 kmem_cache_free(client_slab, clp);
1931 static void drop_client(struct nfs4_client *clp)
1933 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
1937 free_client(struct nfs4_client *clp)
1939 while (!list_empty(&clp->cl_sessions)) {
1940 struct nfsd4_session *ses;
1941 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1943 list_del(&ses->se_perclnt);
1944 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1947 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1948 if (clp->cl_nfsd_dentry) {
1949 nfsd_client_rmdir(clp->cl_nfsd_dentry);
1950 clp->cl_nfsd_dentry = NULL;
1951 wake_up_all(&expiry_wq);
1956 /* must be called under the client_lock */
1958 unhash_client_locked(struct nfs4_client *clp)
1960 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1961 struct nfsd4_session *ses;
1963 lockdep_assert_held(&nn->client_lock);
1965 /* Mark the client as expired! */
1967 /* Make it invisible */
1968 if (!list_empty(&clp->cl_idhash)) {
1969 list_del_init(&clp->cl_idhash);
1970 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1971 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1973 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1975 list_del_init(&clp->cl_lru);
1976 spin_lock(&clp->cl_lock);
1977 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1978 list_del_init(&ses->se_hash);
1979 spin_unlock(&clp->cl_lock);
1983 unhash_client(struct nfs4_client *clp)
1985 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1987 spin_lock(&nn->client_lock);
1988 unhash_client_locked(clp);
1989 spin_unlock(&nn->client_lock);
1992 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1994 if (atomic_read(&clp->cl_rpc_users))
1995 return nfserr_jukebox;
1996 unhash_client_locked(clp);
2001 __destroy_client(struct nfs4_client *clp)
2004 struct nfs4_openowner *oo;
2005 struct nfs4_delegation *dp;
2006 struct list_head reaplist;
2008 INIT_LIST_HEAD(&reaplist);
2009 spin_lock(&state_lock);
2010 while (!list_empty(&clp->cl_delegations)) {
2011 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2012 WARN_ON(!unhash_delegation_locked(dp));
2013 list_add(&dp->dl_recall_lru, &reaplist);
2015 spin_unlock(&state_lock);
2016 while (!list_empty(&reaplist)) {
2017 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2018 list_del_init(&dp->dl_recall_lru);
2019 destroy_unhashed_deleg(dp);
2021 while (!list_empty(&clp->cl_revoked)) {
2022 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2023 list_del_init(&dp->dl_recall_lru);
2024 nfs4_put_stid(&dp->dl_stid);
2026 while (!list_empty(&clp->cl_openowners)) {
2027 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2028 nfs4_get_stateowner(&oo->oo_owner);
2029 release_openowner(oo);
2031 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2032 struct nfs4_stateowner *so, *tmp;
2034 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2036 /* Should be no openowners at this point */
2037 WARN_ON_ONCE(so->so_is_open_owner);
2038 remove_blocked_locks(lockowner(so));
2041 nfsd4_return_all_client_layouts(clp);
2042 nfsd4_shutdown_copy(clp);
2043 nfsd4_shutdown_callback(clp);
2044 if (clp->cl_cb_conn.cb_xprt)
2045 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2047 wake_up_all(&expiry_wq);
2051 destroy_client(struct nfs4_client *clp)
2054 __destroy_client(clp);
2057 static void inc_reclaim_complete(struct nfs4_client *clp)
2059 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2061 if (!nn->track_reclaim_completes)
2063 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2065 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2066 nn->reclaim_str_hashtbl_size) {
2067 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2069 nfsd4_end_grace(nn);
2073 static void expire_client(struct nfs4_client *clp)
2076 nfsd4_client_record_remove(clp);
2077 __destroy_client(clp);
2080 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2082 memcpy(target->cl_verifier.data, source->data,
2083 sizeof(target->cl_verifier.data));
2086 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2088 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2089 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2092 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2094 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2095 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2097 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2098 if ((source->cr_principal && !target->cr_principal) ||
2099 (source->cr_raw_principal && !target->cr_raw_principal) ||
2100 (source->cr_targ_princ && !target->cr_targ_princ))
2103 target->cr_flavor = source->cr_flavor;
2104 target->cr_uid = source->cr_uid;
2105 target->cr_gid = source->cr_gid;
2106 target->cr_group_info = source->cr_group_info;
2107 get_group_info(target->cr_group_info);
2108 target->cr_gss_mech = source->cr_gss_mech;
2109 if (source->cr_gss_mech)
2110 gss_mech_get(source->cr_gss_mech);
2115 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2117 if (o1->len < o2->len)
2119 if (o1->len > o2->len)
2121 return memcmp(o1->data, o2->data, o1->len);
2125 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2127 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2131 same_clid(clientid_t *cl1, clientid_t *cl2)
2133 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2136 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2140 if (g1->ngroups != g2->ngroups)
2142 for (i=0; i<g1->ngroups; i++)
2143 if (!gid_eq(g1->gid[i], g2->gid[i]))
2149 * RFC 3530 language requires clid_inuse be returned when the
2150 * "principal" associated with a requests differs from that previously
2151 * used. We use uid, gid's, and gss principal string as our best
2152 * approximation. We also don't want to allow non-gss use of a client
2153 * established using gss: in theory cr_principal should catch that
2154 * change, but in practice cr_principal can be null even in the gss case
2155 * since gssd doesn't always pass down a principal string.
2157 static bool is_gss_cred(struct svc_cred *cr)
2159 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2160 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2165 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2167 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2168 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2169 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2170 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2172 /* XXX: check that cr_targ_princ fields match ? */
2173 if (cr1->cr_principal == cr2->cr_principal)
2175 if (!cr1->cr_principal || !cr2->cr_principal)
2177 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2180 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2182 struct svc_cred *cr = &rqstp->rq_cred;
2185 if (!cr->cr_gss_mech)
2187 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2188 return service == RPC_GSS_SVC_INTEGRITY ||
2189 service == RPC_GSS_SVC_PRIVACY;
2192 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2194 struct svc_cred *cr = &rqstp->rq_cred;
2196 if (!cl->cl_mach_cred)
2198 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2200 if (!svc_rqst_integrity_protected(rqstp))
2202 if (cl->cl_cred.cr_raw_principal)
2203 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2204 cr->cr_raw_principal);
2205 if (!cr->cr_principal)
2207 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2210 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2215 * This is opaque to client, so no need to byte-swap. Use
2216 * __force to keep sparse happy
2218 verf[0] = (__force __be32)get_seconds();
2219 verf[1] = (__force __be32)nn->clverifier_counter++;
2220 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2223 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2225 clp->cl_clientid.cl_boot = nn->boot_time;
2226 clp->cl_clientid.cl_id = nn->clientid_counter++;
2227 gen_confirm(clp, nn);
2230 static struct nfs4_stid *
2231 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2233 struct nfs4_stid *ret;
2235 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2236 if (!ret || !ret->sc_type)
2241 static struct nfs4_stid *
2242 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2244 struct nfs4_stid *s;
2246 spin_lock(&cl->cl_lock);
2247 s = find_stateid_locked(cl, t);
2249 if (typemask & s->sc_type)
2250 refcount_inc(&s->sc_count);
2254 spin_unlock(&cl->cl_lock);
2258 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2260 struct nfsdfs_client *nc;
2261 nc = get_nfsdfs_client(inode);
2264 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2267 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2269 seq_printf(m, "\"");
2270 seq_escape_mem_ascii(m, data, len);
2271 seq_printf(m, "\"");
2274 static int client_info_show(struct seq_file *m, void *v)
2276 struct inode *inode = m->private;
2277 struct nfs4_client *clp;
2280 clp = get_nfsdfs_clp(inode);
2283 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2284 seq_printf(m, "clientid: 0x%llx\n", clid);
2285 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2286 seq_printf(m, "name: ");
2287 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2288 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2289 if (clp->cl_nii_domain.data) {
2290 seq_printf(m, "Implementation domain: ");
2291 seq_quote_mem(m, clp->cl_nii_domain.data,
2292 clp->cl_nii_domain.len);
2293 seq_printf(m, "\nImplementation name: ");
2294 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2295 seq_printf(m, "\nImplementation time: [%ld, %ld]\n",
2296 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2303 static int client_info_open(struct inode *inode, struct file *file)
2305 return single_open(file, client_info_show, inode);
2308 static const struct file_operations client_info_fops = {
2309 .open = client_info_open,
2311 .llseek = seq_lseek,
2312 .release = single_release,
2315 static void *states_start(struct seq_file *s, loff_t *pos)
2316 __acquires(&clp->cl_lock)
2318 struct nfs4_client *clp = s->private;
2319 unsigned long id = *pos;
2322 spin_lock(&clp->cl_lock);
2323 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2328 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2330 struct nfs4_client *clp = s->private;
2331 unsigned long id = *pos;
2336 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2341 static void states_stop(struct seq_file *s, void *v)
2342 __releases(&clp->cl_lock)
2344 struct nfs4_client *clp = s->private;
2346 spin_unlock(&clp->cl_lock);
2349 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2351 struct inode *inode = f->nf_inode;
2353 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2354 MAJOR(inode->i_sb->s_dev),
2355 MINOR(inode->i_sb->s_dev),
2359 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2361 seq_printf(s, "owner: ");
2362 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2365 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2367 struct nfs4_ol_stateid *ols;
2368 struct nfs4_file *nf;
2369 struct nfsd_file *file;
2370 struct nfs4_stateowner *oo;
2371 unsigned int access, deny;
2373 if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2374 return 0; /* XXX: or SEQ_SKIP? */
2375 ols = openlockstateid(st);
2376 oo = ols->st_stateowner;
2378 file = find_any_file(nf);
2380 seq_printf(s, "- 0x%16phN: { type: open, ", &st->sc_stateid);
2382 access = bmap_to_share_mode(ols->st_access_bmap);
2383 deny = bmap_to_share_mode(ols->st_deny_bmap);
2385 seq_printf(s, "access: \%s\%s, ",
2386 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2387 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2388 seq_printf(s, "deny: \%s\%s, ",
2389 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2390 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2392 nfs4_show_superblock(s, file);
2393 seq_printf(s, ", ");
2394 nfs4_show_owner(s, oo);
2395 seq_printf(s, " }\n");
2396 nfsd_file_put(file);
2401 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2403 struct nfs4_ol_stateid *ols;
2404 struct nfs4_file *nf;
2405 struct nfsd_file *file;
2406 struct nfs4_stateowner *oo;
2408 ols = openlockstateid(st);
2409 oo = ols->st_stateowner;
2411 file = find_any_file(nf);
2413 seq_printf(s, "- 0x%16phN: { type: lock, ", &st->sc_stateid);
2416 * Note: a lock stateid isn't really the same thing as a lock,
2417 * it's the locking state held by one owner on a file, and there
2418 * may be multiple (or no) lock ranges associated with it.
2419 * (Same for the matter is true of open stateids.)
2422 nfs4_show_superblock(s, file);
2423 /* XXX: open stateid? */
2424 seq_printf(s, ", ");
2425 nfs4_show_owner(s, oo);
2426 seq_printf(s, " }\n");
2427 nfsd_file_put(file);
2432 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2434 struct nfs4_delegation *ds;
2435 struct nfs4_file *nf;
2436 struct nfsd_file *file;
2438 ds = delegstateid(st);
2440 file = nf->fi_deleg_file;
2442 seq_printf(s, "- 0x%16phN: { type: deleg, ", &st->sc_stateid);
2444 /* Kinda dead code as long as we only support read delegs: */
2445 seq_printf(s, "access: %s, ",
2446 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2448 /* XXX: lease time, whether it's being recalled. */
2450 nfs4_show_superblock(s, file);
2451 seq_printf(s, " }\n");
2456 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2458 struct nfs4_layout_stateid *ls;
2459 struct nfsd_file *file;
2461 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2464 seq_printf(s, "- 0x%16phN: { type: layout, ", &st->sc_stateid);
2466 /* XXX: What else would be useful? */
2468 nfs4_show_superblock(s, file);
2469 seq_printf(s, " }\n");
2474 static int states_show(struct seq_file *s, void *v)
2476 struct nfs4_stid *st = v;
2478 switch (st->sc_type) {
2479 case NFS4_OPEN_STID:
2480 return nfs4_show_open(s, st);
2481 case NFS4_LOCK_STID:
2482 return nfs4_show_lock(s, st);
2483 case NFS4_DELEG_STID:
2484 return nfs4_show_deleg(s, st);
2485 case NFS4_LAYOUT_STID:
2486 return nfs4_show_layout(s, st);
2488 return 0; /* XXX: or SEQ_SKIP? */
2490 /* XXX: copy stateids? */
2493 static struct seq_operations states_seq_ops = {
2494 .start = states_start,
2495 .next = states_next,
2496 .stop = states_stop,
2500 static int client_states_open(struct inode *inode, struct file *file)
2503 struct nfs4_client *clp;
2506 clp = get_nfsdfs_clp(inode);
2510 ret = seq_open(file, &states_seq_ops);
2513 s = file->private_data;
2518 static int client_opens_release(struct inode *inode, struct file *file)
2520 struct seq_file *m = file->private_data;
2521 struct nfs4_client *clp = m->private;
2523 /* XXX: alternatively, we could get/drop in seq start/stop */
2528 static const struct file_operations client_states_fops = {
2529 .open = client_states_open,
2531 .llseek = seq_lseek,
2532 .release = client_opens_release,
2536 * Normally we refuse to destroy clients that are in use, but here the
2537 * administrator is telling us to just do it. We also want to wait
2538 * so the caller has a guarantee that the client's locks are gone by
2539 * the time the write returns:
2541 static void force_expire_client(struct nfs4_client *clp)
2543 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2544 bool already_expired;
2546 spin_lock(&clp->cl_lock);
2548 spin_unlock(&clp->cl_lock);
2550 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2551 spin_lock(&nn->client_lock);
2552 already_expired = list_empty(&clp->cl_lru);
2553 if (!already_expired)
2554 unhash_client_locked(clp);
2555 spin_unlock(&nn->client_lock);
2557 if (!already_expired)
2560 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2563 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2564 size_t size, loff_t *pos)
2567 struct nfs4_client *clp;
2569 data = simple_transaction_get(file, buf, size);
2571 return PTR_ERR(data);
2572 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
2574 clp = get_nfsdfs_clp(file_inode(file));
2577 force_expire_client(clp);
2582 static const struct file_operations client_ctl_fops = {
2583 .write = client_ctl_write,
2584 .release = simple_transaction_release,
2587 static const struct tree_descr client_files[] = {
2588 [0] = {"info", &client_info_fops, S_IRUSR},
2589 [1] = {"states", &client_states_fops, S_IRUSR},
2590 [2] = {"ctl", &client_ctl_fops, S_IRUSR|S_IWUSR},
2594 static struct nfs4_client *create_client(struct xdr_netobj name,
2595 struct svc_rqst *rqstp, nfs4_verifier *verf)
2597 struct nfs4_client *clp;
2598 struct sockaddr *sa = svc_addr(rqstp);
2600 struct net *net = SVC_NET(rqstp);
2601 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2603 clp = alloc_client(name);
2607 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2613 kref_init(&clp->cl_nfsdfs.cl_ref);
2614 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2615 clp->cl_time = get_seconds();
2616 clear_bit(0, &clp->cl_cb_slot_busy);
2617 copy_verf(clp, verf);
2618 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2619 clp->cl_cb_session = NULL;
2621 clp->cl_nfsd_dentry = nfsd_client_mkdir(nn, &clp->cl_nfsdfs,
2622 clp->cl_clientid.cl_id - nn->clientid_base,
2624 if (!clp->cl_nfsd_dentry) {
2632 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2634 struct rb_node **new = &(root->rb_node), *parent = NULL;
2635 struct nfs4_client *clp;
2638 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2641 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2642 new = &((*new)->rb_left);
2644 new = &((*new)->rb_right);
2647 rb_link_node(&new_clp->cl_namenode, parent, new);
2648 rb_insert_color(&new_clp->cl_namenode, root);
2651 static struct nfs4_client *
2652 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2655 struct rb_node *node = root->rb_node;
2656 struct nfs4_client *clp;
2659 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2660 cmp = compare_blob(&clp->cl_name, name);
2662 node = node->rb_left;
2664 node = node->rb_right;
2672 add_to_unconfirmed(struct nfs4_client *clp)
2674 unsigned int idhashval;
2675 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2677 lockdep_assert_held(&nn->client_lock);
2679 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2680 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2681 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2682 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2683 renew_client_locked(clp);
2687 move_to_confirmed(struct nfs4_client *clp)
2689 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2690 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2692 lockdep_assert_held(&nn->client_lock);
2694 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2695 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2696 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2697 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2698 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2699 renew_client_locked(clp);
2702 static struct nfs4_client *
2703 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2705 struct nfs4_client *clp;
2706 unsigned int idhashval = clientid_hashval(clid->cl_id);
2708 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2709 if (same_clid(&clp->cl_clientid, clid)) {
2710 if ((bool)clp->cl_minorversion != sessions)
2712 renew_client_locked(clp);
2719 static struct nfs4_client *
2720 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2722 struct list_head *tbl = nn->conf_id_hashtbl;
2724 lockdep_assert_held(&nn->client_lock);
2725 return find_client_in_id_table(tbl, clid, sessions);
2728 static struct nfs4_client *
2729 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2731 struct list_head *tbl = nn->unconf_id_hashtbl;
2733 lockdep_assert_held(&nn->client_lock);
2734 return find_client_in_id_table(tbl, clid, sessions);
2737 static bool clp_used_exchangeid(struct nfs4_client *clp)
2739 return clp->cl_exchange_flags != 0;
2742 static struct nfs4_client *
2743 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2745 lockdep_assert_held(&nn->client_lock);
2746 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2749 static struct nfs4_client *
2750 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2752 lockdep_assert_held(&nn->client_lock);
2753 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2757 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2759 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2760 struct sockaddr *sa = svc_addr(rqstp);
2761 u32 scopeid = rpc_get_scope_id(sa);
2762 unsigned short expected_family;
2764 /* Currently, we only support tcp and tcp6 for the callback channel */
2765 if (se->se_callback_netid_len == 3 &&
2766 !memcmp(se->se_callback_netid_val, "tcp", 3))
2767 expected_family = AF_INET;
2768 else if (se->se_callback_netid_len == 4 &&
2769 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2770 expected_family = AF_INET6;
2774 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2775 se->se_callback_addr_len,
2776 (struct sockaddr *)&conn->cb_addr,
2777 sizeof(conn->cb_addr));
2779 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2782 if (conn->cb_addr.ss_family == AF_INET6)
2783 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2785 conn->cb_prog = se->se_callback_prog;
2786 conn->cb_ident = se->se_callback_ident;
2787 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2790 conn->cb_addr.ss_family = AF_UNSPEC;
2791 conn->cb_addrlen = 0;
2792 dprintk("NFSD: this client (clientid %08x/%08x) "
2793 "will not receive delegations\n",
2794 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2800 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2803 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2805 struct xdr_buf *buf = resp->xdr.buf;
2806 struct nfsd4_slot *slot = resp->cstate.slot;
2809 dprintk("--> %s slot %p\n", __func__, slot);
2811 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2812 slot->sl_opcnt = resp->opcnt;
2813 slot->sl_status = resp->cstate.status;
2814 free_svc_cred(&slot->sl_cred);
2815 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2817 if (!nfsd4_cache_this(resp)) {
2818 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2821 slot->sl_flags |= NFSD4_SLOT_CACHED;
2823 base = resp->cstate.data_offset;
2824 slot->sl_datalen = buf->len - base;
2825 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2826 WARN(1, "%s: sessions DRC could not cache compound\n",
2832 * Encode the replay sequence operation from the slot values.
2833 * If cachethis is FALSE encode the uncached rep error on the next
2834 * operation which sets resp->p and increments resp->opcnt for
2835 * nfs4svc_encode_compoundres.
2839 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2840 struct nfsd4_compoundres *resp)
2842 struct nfsd4_op *op;
2843 struct nfsd4_slot *slot = resp->cstate.slot;
2845 /* Encode the replayed sequence operation */
2846 op = &args->ops[resp->opcnt - 1];
2847 nfsd4_encode_operation(resp, op);
2849 if (slot->sl_flags & NFSD4_SLOT_CACHED)
2851 if (args->opcnt == 1) {
2853 * The original operation wasn't a solo sequence--we
2854 * always cache those--so this retry must not match the
2857 op->status = nfserr_seq_false_retry;
2859 op = &args->ops[resp->opcnt++];
2860 op->status = nfserr_retry_uncached_rep;
2861 nfsd4_encode_operation(resp, op);
2867 * The sequence operation is not cached because we can use the slot and
2871 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2872 struct nfsd4_sequence *seq)
2874 struct nfsd4_slot *slot = resp->cstate.slot;
2875 struct xdr_stream *xdr = &resp->xdr;
2879 dprintk("--> %s slot %p\n", __func__, slot);
2881 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2885 p = xdr_reserve_space(xdr, slot->sl_datalen);
2888 return nfserr_serverfault;
2890 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2891 xdr_commit_encode(xdr);
2893 resp->opcnt = slot->sl_opcnt;
2894 return slot->sl_status;
2898 * Set the exchange_id flags returned by the server.
2901 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2903 #ifdef CONFIG_NFSD_PNFS
2904 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2906 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2909 /* Referrals are supported, Migration is not. */
2910 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2912 /* set the wire flags to return to client. */
2913 clid->flags = new->cl_exchange_flags;
2916 static bool client_has_openowners(struct nfs4_client *clp)
2918 struct nfs4_openowner *oo;
2920 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2921 if (!list_empty(&oo->oo_owner.so_stateids))
2927 static bool client_has_state(struct nfs4_client *clp)
2929 return client_has_openowners(clp)
2930 #ifdef CONFIG_NFSD_PNFS
2931 || !list_empty(&clp->cl_lo_states)
2933 || !list_empty(&clp->cl_delegations)
2934 || !list_empty(&clp->cl_sessions)
2935 || !list_empty(&clp->async_copies);
2938 static __be32 copy_impl_id(struct nfs4_client *clp,
2939 struct nfsd4_exchange_id *exid)
2941 if (!exid->nii_domain.data)
2943 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
2944 if (!clp->cl_nii_domain.data)
2945 return nfserr_jukebox;
2946 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
2947 if (!clp->cl_nii_name.data)
2948 return nfserr_jukebox;
2949 clp->cl_nii_time.tv_sec = exid->nii_time.tv_sec;
2950 clp->cl_nii_time.tv_nsec = exid->nii_time.tv_nsec;
2955 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2956 union nfsd4_op_u *u)
2958 struct nfsd4_exchange_id *exid = &u->exchange_id;
2959 struct nfs4_client *conf, *new;
2960 struct nfs4_client *unconf = NULL;
2962 char addr_str[INET6_ADDRSTRLEN];
2963 nfs4_verifier verf = exid->verifier;
2964 struct sockaddr *sa = svc_addr(rqstp);
2965 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2966 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2968 rpc_ntop(sa, addr_str, sizeof(addr_str));
2969 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2970 "ip_addr=%s flags %x, spa_how %d\n",
2971 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2972 addr_str, exid->flags, exid->spa_how);
2974 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2975 return nfserr_inval;
2977 new = create_client(exid->clname, rqstp, &verf);
2979 return nfserr_jukebox;
2980 status = copy_impl_id(new, exid);
2984 switch (exid->spa_how) {
2986 exid->spo_must_enforce[0] = 0;
2987 exid->spo_must_enforce[1] = (
2988 1 << (OP_BIND_CONN_TO_SESSION - 32) |
2989 1 << (OP_EXCHANGE_ID - 32) |
2990 1 << (OP_CREATE_SESSION - 32) |
2991 1 << (OP_DESTROY_SESSION - 32) |
2992 1 << (OP_DESTROY_CLIENTID - 32));
2994 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2995 1 << (OP_OPEN_DOWNGRADE) |
2997 1 << (OP_DELEGRETURN));
2999 exid->spo_must_allow[1] &= (
3000 1 << (OP_TEST_STATEID - 32) |
3001 1 << (OP_FREE_STATEID - 32));
3002 if (!svc_rqst_integrity_protected(rqstp)) {
3003 status = nfserr_inval;
3007 * Sometimes userspace doesn't give us a principal.
3008 * Which is a bug, really. Anyway, we can't enforce
3009 * MACH_CRED in that case, better to give up now:
3011 if (!new->cl_cred.cr_principal &&
3012 !new->cl_cred.cr_raw_principal) {
3013 status = nfserr_serverfault;
3016 new->cl_mach_cred = true;
3019 default: /* checked by xdr code */
3023 status = nfserr_encr_alg_unsupp;
3027 /* Cases below refer to rfc 5661 section 18.35.4: */
3028 spin_lock(&nn->client_lock);
3029 conf = find_confirmed_client_by_name(&exid->clname, nn);
3031 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3032 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3035 if (!clp_used_exchangeid(conf)) { /* buggy client */
3036 status = nfserr_inval;
3039 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3040 status = nfserr_wrong_cred;
3043 if (!creds_match) { /* case 9 */
3044 status = nfserr_perm;
3047 if (!verfs_match) { /* case 8 */
3048 status = nfserr_not_same;
3052 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3055 if (!creds_match) { /* case 3 */
3056 if (client_has_state(conf)) {
3057 status = nfserr_clid_inuse;
3062 if (verfs_match) { /* case 2 */
3063 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3066 /* case 5, client reboot */
3071 if (update) { /* case 7 */
3072 status = nfserr_noent;
3076 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3077 if (unconf) /* case 4, possible retry or client restart */
3078 unhash_client_locked(unconf);
3080 /* case 1 (normal case) */
3083 status = mark_client_expired_locked(conf);
3087 new->cl_minorversion = cstate->minorversion;
3088 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3089 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3091 add_to_unconfirmed(new);
3094 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3095 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3097 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3098 nfsd4_set_ex_flags(conf, exid);
3100 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3101 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3105 spin_unlock(&nn->client_lock);
3110 expire_client(unconf);
3115 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3117 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3120 /* The slot is in use, and no response has been sent. */
3122 if (seqid == slot_seqid)
3123 return nfserr_jukebox;
3125 return nfserr_seq_misordered;
3127 /* Note unsigned 32-bit arithmetic handles wraparound: */
3128 if (likely(seqid == slot_seqid + 1))
3130 if (seqid == slot_seqid)
3131 return nfserr_replay_cache;
3132 return nfserr_seq_misordered;
3136 * Cache the create session result into the create session single DRC
3137 * slot cache by saving the xdr structure. sl_seqid has been set.
3138 * Do this for solo or embedded create session operations.
3141 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3142 struct nfsd4_clid_slot *slot, __be32 nfserr)
3144 slot->sl_status = nfserr;
3145 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3149 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3150 struct nfsd4_clid_slot *slot)
3152 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3153 return slot->sl_status;
3156 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3157 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3158 1 + /* MIN tag is length with zero, only length */ \
3159 3 + /* version, opcount, opcode */ \
3160 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3161 /* seqid, slotID, slotID, cache */ \
3162 4 ) * sizeof(__be32))
3164 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3165 2 + /* verifier: AUTH_NULL, length 0 */\
3167 1 + /* MIN tag is length with zero, only length */ \
3168 3 + /* opcount, opcode, opstatus*/ \
3169 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3170 /* seqid, slotID, slotID, slotID, status */ \
3171 5 ) * sizeof(__be32))
3173 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3175 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3177 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3178 return nfserr_toosmall;
3179 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3180 return nfserr_toosmall;
3181 ca->headerpadsz = 0;
3182 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3183 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3184 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3185 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3186 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3187 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3189 * Note decreasing slot size below client's request may make it
3190 * difficult for client to function correctly, whereas
3191 * decreasing the number of slots will (just?) affect
3192 * performance. When short on memory we therefore prefer to
3193 * decrease number of slots instead of their size. Clients that
3194 * request larger slots than they need will get poor results:
3195 * Note that we always allow at least one slot, because our
3196 * accounting is soft and provides no guarantees either way.
3198 ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3204 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3205 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3207 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3208 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3210 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3211 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3213 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3214 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3215 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3216 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3219 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3221 ca->headerpadsz = 0;
3223 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3224 return nfserr_toosmall;
3225 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3226 return nfserr_toosmall;
3227 ca->maxresp_cached = 0;
3229 return nfserr_toosmall;
3234 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3236 switch (cbs->flavor) {
3242 * GSS case: the spec doesn't allow us to return this
3243 * error. But it also doesn't allow us not to support
3245 * I'd rather this fail hard than return some error the
3246 * client might think it can already handle:
3248 return nfserr_encr_alg_unsupp;
3253 nfsd4_create_session(struct svc_rqst *rqstp,
3254 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3256 struct nfsd4_create_session *cr_ses = &u->create_session;
3257 struct sockaddr *sa = svc_addr(rqstp);
3258 struct nfs4_client *conf, *unconf;
3259 struct nfs4_client *old = NULL;
3260 struct nfsd4_session *new;
3261 struct nfsd4_conn *conn;
3262 struct nfsd4_clid_slot *cs_slot = NULL;
3264 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3266 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3267 return nfserr_inval;
3268 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3271 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3274 status = check_backchannel_attrs(&cr_ses->back_channel);
3276 goto out_release_drc_mem;
3277 status = nfserr_jukebox;
3278 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3280 goto out_release_drc_mem;
3281 conn = alloc_conn_from_crses(rqstp, cr_ses);
3283 goto out_free_session;
3285 spin_lock(&nn->client_lock);
3286 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3287 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3288 WARN_ON_ONCE(conf && unconf);
3291 status = nfserr_wrong_cred;
3292 if (!nfsd4_mach_creds_match(conf, rqstp))
3294 cs_slot = &conf->cl_cs_slot;
3295 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3297 if (status == nfserr_replay_cache)
3298 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3301 } else if (unconf) {
3302 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3303 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3304 status = nfserr_clid_inuse;
3307 status = nfserr_wrong_cred;
3308 if (!nfsd4_mach_creds_match(unconf, rqstp))
3310 cs_slot = &unconf->cl_cs_slot;
3311 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3313 /* an unconfirmed replay returns misordered */
3314 status = nfserr_seq_misordered;
3317 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3319 status = mark_client_expired_locked(old);
3325 move_to_confirmed(unconf);
3328 status = nfserr_stale_clientid;
3332 /* Persistent sessions are not supported */
3333 cr_ses->flags &= ~SESSION4_PERSIST;
3334 /* Upshifting from TCP to RDMA is not supported */
3335 cr_ses->flags &= ~SESSION4_RDMA;
3337 init_session(rqstp, new, conf, cr_ses);
3338 nfsd4_get_session_locked(new);
3340 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3341 NFS4_MAX_SESSIONID_LEN);
3342 cs_slot->sl_seqid++;
3343 cr_ses->seqid = cs_slot->sl_seqid;
3345 /* cache solo and embedded create sessions under the client_lock */
3346 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3347 spin_unlock(&nn->client_lock);
3348 /* init connection and backchannel */
3349 nfsd4_init_conn(rqstp, conn, new);
3350 nfsd4_put_session(new);
3355 spin_unlock(&nn->client_lock);
3360 __free_session(new);
3361 out_release_drc_mem:
3362 nfsd4_put_drc_mem(&cr_ses->fore_channel);
3366 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3369 case NFS4_CDFC4_FORE:
3370 case NFS4_CDFC4_BACK:
3372 case NFS4_CDFC4_FORE_OR_BOTH:
3373 case NFS4_CDFC4_BACK_OR_BOTH:
3374 *dir = NFS4_CDFC4_BOTH;
3377 return nfserr_inval;
3380 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3381 struct nfsd4_compound_state *cstate,
3382 union nfsd4_op_u *u)
3384 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3385 struct nfsd4_session *session = cstate->session;
3386 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3389 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3392 spin_lock(&nn->client_lock);
3393 session->se_cb_prog = bc->bc_cb_program;
3394 session->se_cb_sec = bc->bc_cb_sec;
3395 spin_unlock(&nn->client_lock);
3397 nfsd4_probe_callback(session->se_client);
3402 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3403 struct nfsd4_compound_state *cstate,
3404 union nfsd4_op_u *u)
3406 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3408 struct nfsd4_conn *conn;
3409 struct nfsd4_session *session;
3410 struct net *net = SVC_NET(rqstp);
3411 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3413 if (!nfsd4_last_compound_op(rqstp))
3414 return nfserr_not_only_op;
3415 spin_lock(&nn->client_lock);
3416 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
3417 spin_unlock(&nn->client_lock);
3419 goto out_no_session;
3420 status = nfserr_wrong_cred;
3421 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
3423 status = nfsd4_map_bcts_dir(&bcts->dir);
3426 conn = alloc_conn(rqstp, bcts->dir);
3427 status = nfserr_jukebox;
3430 nfsd4_init_conn(rqstp, conn, session);
3433 nfsd4_put_session(session);
3438 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3440 if (!cstate->session)
3442 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
3446 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3447 union nfsd4_op_u *u)
3449 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3450 struct nfsd4_session *ses;
3452 int ref_held_by_me = 0;
3453 struct net *net = SVC_NET(r);
3454 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3456 status = nfserr_not_only_op;
3457 if (nfsd4_compound_in_session(cstate, sessionid)) {
3458 if (!nfsd4_last_compound_op(r))
3462 dump_sessionid(__func__, sessionid);
3463 spin_lock(&nn->client_lock);
3464 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
3466 goto out_client_lock;
3467 status = nfserr_wrong_cred;
3468 if (!nfsd4_mach_creds_match(ses->se_client, r))
3469 goto out_put_session;
3470 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
3472 goto out_put_session;
3473 unhash_session(ses);
3474 spin_unlock(&nn->client_lock);
3476 nfsd4_probe_callback_sync(ses->se_client);
3478 spin_lock(&nn->client_lock);
3481 nfsd4_put_session_locked(ses);
3483 spin_unlock(&nn->client_lock);
3488 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3490 struct nfsd4_conn *c;
3492 list_for_each_entry(c, &s->se_conns, cn_persession) {
3493 if (c->cn_xprt == xpt) {
3500 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3502 struct nfs4_client *clp = ses->se_client;
3503 struct nfsd4_conn *c;
3504 __be32 status = nfs_ok;
3507 spin_lock(&clp->cl_lock);
3508 c = __nfsd4_find_conn(new->cn_xprt, ses);
3511 status = nfserr_conn_not_bound_to_session;
3512 if (clp->cl_mach_cred)
3514 __nfsd4_hash_conn(new, ses);
3515 spin_unlock(&clp->cl_lock);
3516 ret = nfsd4_register_conn(new);
3518 /* oops; xprt is already down: */
3519 nfsd4_conn_lost(&new->cn_xpt_user);
3522 spin_unlock(&clp->cl_lock);
3527 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3529 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3531 return args->opcnt > session->se_fchannel.maxops;
3534 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3535 struct nfsd4_session *session)
3537 struct xdr_buf *xb = &rqstp->rq_arg;
3539 return xb->len > session->se_fchannel.maxreq_sz;
3542 static bool replay_matches_cache(struct svc_rqst *rqstp,
3543 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3545 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3547 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3548 (bool)seq->cachethis)
3551 * If there's an error than the reply can have fewer ops than
3552 * the call. But if we cached a reply with *more* ops than the
3553 * call you're sending us now, then this new call is clearly not
3554 * really a replay of the old one:
3556 if (slot->sl_opcnt < argp->opcnt)
3558 /* This is the only check explicitly called by spec: */
3559 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3562 * There may be more comparisons we could actually do, but the
3563 * spec doesn't require us to catch every case where the calls
3564 * don't match (that would require caching the call as well as
3565 * the reply), so we don't bother.
3571 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3572 union nfsd4_op_u *u)
3574 struct nfsd4_sequence *seq = &u->sequence;
3575 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3576 struct xdr_stream *xdr = &resp->xdr;
3577 struct nfsd4_session *session;
3578 struct nfs4_client *clp;
3579 struct nfsd4_slot *slot;
3580 struct nfsd4_conn *conn;
3583 struct net *net = SVC_NET(rqstp);
3584 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3586 if (resp->opcnt != 1)
3587 return nfserr_sequence_pos;
3590 * Will be either used or freed by nfsd4_sequence_check_conn
3593 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3595 return nfserr_jukebox;
3597 spin_lock(&nn->client_lock);
3598 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3600 goto out_no_session;
3601 clp = session->se_client;
3603 status = nfserr_too_many_ops;
3604 if (nfsd4_session_too_many_ops(rqstp, session))
3605 goto out_put_session;
3607 status = nfserr_req_too_big;
3608 if (nfsd4_request_too_big(rqstp, session))
3609 goto out_put_session;
3611 status = nfserr_badslot;
3612 if (seq->slotid >= session->se_fchannel.maxreqs)
3613 goto out_put_session;
3615 slot = session->se_slots[seq->slotid];
3616 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3618 /* We do not negotiate the number of slots yet, so set the
3619 * maxslots to the session maxreqs which is used to encode
3620 * sr_highest_slotid and the sr_target_slot id to maxslots */
3621 seq->maxslots = session->se_fchannel.maxreqs;
3623 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3624 slot->sl_flags & NFSD4_SLOT_INUSE);
3625 if (status == nfserr_replay_cache) {
3626 status = nfserr_seq_misordered;
3627 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3628 goto out_put_session;
3629 status = nfserr_seq_false_retry;
3630 if (!replay_matches_cache(rqstp, seq, slot))
3631 goto out_put_session;
3632 cstate->slot = slot;
3633 cstate->session = session;
3635 /* Return the cached reply status and set cstate->status
3636 * for nfsd4_proc_compound processing */
3637 status = nfsd4_replay_cache_entry(resp, seq);
3638 cstate->status = nfserr_replay_cache;
3642 goto out_put_session;
3644 status = nfsd4_sequence_check_conn(conn, session);
3647 goto out_put_session;
3649 buflen = (seq->cachethis) ?
3650 session->se_fchannel.maxresp_cached :
3651 session->se_fchannel.maxresp_sz;
3652 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3654 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3655 goto out_put_session;
3656 svc_reserve(rqstp, buflen);
3659 /* Success! bump slot seqid */
3660 slot->sl_seqid = seq->seqid;
3661 slot->sl_flags |= NFSD4_SLOT_INUSE;
3663 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3665 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3667 cstate->slot = slot;
3668 cstate->session = session;
3672 switch (clp->cl_cb_state) {
3674 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3676 case NFSD4_CB_FAULT:
3677 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3680 seq->status_flags = 0;
3682 if (!list_empty(&clp->cl_revoked))
3683 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3687 spin_unlock(&nn->client_lock);
3690 nfsd4_put_session_locked(session);
3691 goto out_no_session;
3695 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3697 struct nfsd4_compound_state *cs = &resp->cstate;
3699 if (nfsd4_has_session(cs)) {
3700 if (cs->status != nfserr_replay_cache) {
3701 nfsd4_store_cache_entry(resp);
3702 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3704 /* Drop session reference that was taken in nfsd4_sequence() */
3705 nfsd4_put_session(cs->session);
3707 put_client_renew(cs->clp);
3711 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3712 struct nfsd4_compound_state *cstate,
3713 union nfsd4_op_u *u)
3715 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3716 struct nfs4_client *conf, *unconf;
3717 struct nfs4_client *clp = NULL;
3719 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3721 spin_lock(&nn->client_lock);
3722 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3723 conf = find_confirmed_client(&dc->clientid, true, nn);
3724 WARN_ON_ONCE(conf && unconf);
3727 if (client_has_state(conf)) {
3728 status = nfserr_clientid_busy;
3731 status = mark_client_expired_locked(conf);
3738 status = nfserr_stale_clientid;
3741 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3743 status = nfserr_wrong_cred;
3746 unhash_client_locked(clp);
3748 spin_unlock(&nn->client_lock);
3755 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3756 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3758 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3761 if (rc->rca_one_fs) {
3762 if (!cstate->current_fh.fh_dentry)
3763 return nfserr_nofilehandle;
3765 * We don't take advantage of the rca_one_fs case.
3766 * That's OK, it's optional, we can safely ignore it.
3771 status = nfserr_complete_already;
3772 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3773 &cstate->session->se_client->cl_flags))
3776 status = nfserr_stale_clientid;
3777 if (is_client_expired(cstate->session->se_client))
3779 * The following error isn't really legal.
3780 * But we only get here if the client just explicitly
3781 * destroyed the client. Surely it no longer cares what
3782 * error it gets back on an operation for the dead
3788 nfsd4_client_record_create(cstate->session->se_client);
3789 inc_reclaim_complete(cstate->session->se_client);
3795 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3796 union nfsd4_op_u *u)
3798 struct nfsd4_setclientid *setclid = &u->setclientid;
3799 struct xdr_netobj clname = setclid->se_name;
3800 nfs4_verifier clverifier = setclid->se_verf;
3801 struct nfs4_client *conf, *new;
3802 struct nfs4_client *unconf = NULL;
3804 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3806 new = create_client(clname, rqstp, &clverifier);
3808 return nfserr_jukebox;
3809 /* Cases below refer to rfc 3530 section 14.2.33: */
3810 spin_lock(&nn->client_lock);
3811 conf = find_confirmed_client_by_name(&clname, nn);
3812 if (conf && client_has_state(conf)) {
3814 status = nfserr_clid_inuse;
3815 if (clp_used_exchangeid(conf))
3817 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3818 char addr_str[INET6_ADDRSTRLEN];
3819 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3821 dprintk("NFSD: setclientid: string in use by client "
3822 "at %s\n", addr_str);
3826 unconf = find_unconfirmed_client_by_name(&clname, nn);
3828 unhash_client_locked(unconf);
3829 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3830 /* case 1: probable callback update */
3831 copy_clid(new, conf);
3832 gen_confirm(new, nn);
3833 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3835 new->cl_minorversion = 0;
3836 gen_callback(new, setclid, rqstp);
3837 add_to_unconfirmed(new);
3838 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3839 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3840 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3844 spin_unlock(&nn->client_lock);
3848 expire_client(unconf);
3854 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3855 struct nfsd4_compound_state *cstate,
3856 union nfsd4_op_u *u)
3858 struct nfsd4_setclientid_confirm *setclientid_confirm =
3859 &u->setclientid_confirm;
3860 struct nfs4_client *conf, *unconf;
3861 struct nfs4_client *old = NULL;
3862 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3863 clientid_t * clid = &setclientid_confirm->sc_clientid;
3865 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3867 if (STALE_CLIENTID(clid, nn))
3868 return nfserr_stale_clientid;
3870 spin_lock(&nn->client_lock);
3871 conf = find_confirmed_client(clid, false, nn);
3872 unconf = find_unconfirmed_client(clid, false, nn);
3874 * We try hard to give out unique clientid's, so if we get an
3875 * attempt to confirm the same clientid with a different cred,
3876 * the client may be buggy; this should never happen.
3878 * Nevertheless, RFC 7530 recommends INUSE for this case:
3880 status = nfserr_clid_inuse;
3881 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3883 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3885 /* cases below refer to rfc 3530 section 14.2.34: */
3886 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3887 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3888 /* case 2: probable retransmit */
3890 } else /* case 4: client hasn't noticed we rebooted yet? */
3891 status = nfserr_stale_clientid;
3895 if (conf) { /* case 1: callback update */
3897 unhash_client_locked(old);
3898 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3899 } else { /* case 3: normal case; new or rebooted client */
3900 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3902 status = nfserr_clid_inuse;
3903 if (client_has_state(old)
3904 && !same_creds(&unconf->cl_cred,
3907 status = mark_client_expired_locked(old);
3913 move_to_confirmed(unconf);
3916 get_client_locked(conf);
3917 spin_unlock(&nn->client_lock);
3918 nfsd4_probe_callback(conf);
3919 spin_lock(&nn->client_lock);
3920 put_client_renew_locked(conf);
3922 spin_unlock(&nn->client_lock);
3928 static struct nfs4_file *nfsd4_alloc_file(void)
3930 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3933 /* OPEN Share state helper functions */
3934 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3935 struct nfs4_file *fp)
3937 lockdep_assert_held(&state_lock);
3939 refcount_set(&fp->fi_ref, 1);
3940 spin_lock_init(&fp->fi_lock);
3941 INIT_LIST_HEAD(&fp->fi_stateids);
3942 INIT_LIST_HEAD(&fp->fi_delegations);
3943 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3944 fh_copy_shallow(&fp->fi_fhandle, fh);
3945 fp->fi_deleg_file = NULL;
3946 fp->fi_had_conflict = false;
3947 fp->fi_share_deny = 0;
3948 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3949 memset(fp->fi_access, 0, sizeof(fp->fi_access));
3950 #ifdef CONFIG_NFSD_PNFS
3951 INIT_LIST_HEAD(&fp->fi_lo_states);
3952 atomic_set(&fp->fi_lo_recalls, 0);
3954 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3958 nfsd4_free_slabs(void)
3960 kmem_cache_destroy(client_slab);
3961 kmem_cache_destroy(openowner_slab);
3962 kmem_cache_destroy(lockowner_slab);
3963 kmem_cache_destroy(file_slab);
3964 kmem_cache_destroy(stateid_slab);
3965 kmem_cache_destroy(deleg_slab);
3966 kmem_cache_destroy(odstate_slab);
3970 nfsd4_init_slabs(void)
3972 client_slab = kmem_cache_create("nfsd4_clients",
3973 sizeof(struct nfs4_client), 0, 0, NULL);
3974 if (client_slab == NULL)
3976 openowner_slab = kmem_cache_create("nfsd4_openowners",
3977 sizeof(struct nfs4_openowner), 0, 0, NULL);
3978 if (openowner_slab == NULL)
3979 goto out_free_client_slab;
3980 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3981 sizeof(struct nfs4_lockowner), 0, 0, NULL);
3982 if (lockowner_slab == NULL)
3983 goto out_free_openowner_slab;
3984 file_slab = kmem_cache_create("nfsd4_files",
3985 sizeof(struct nfs4_file), 0, 0, NULL);
3986 if (file_slab == NULL)
3987 goto out_free_lockowner_slab;
3988 stateid_slab = kmem_cache_create("nfsd4_stateids",
3989 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3990 if (stateid_slab == NULL)
3991 goto out_free_file_slab;
3992 deleg_slab = kmem_cache_create("nfsd4_delegations",
3993 sizeof(struct nfs4_delegation), 0, 0, NULL);
3994 if (deleg_slab == NULL)
3995 goto out_free_stateid_slab;
3996 odstate_slab = kmem_cache_create("nfsd4_odstate",
3997 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3998 if (odstate_slab == NULL)
3999 goto out_free_deleg_slab;
4002 out_free_deleg_slab:
4003 kmem_cache_destroy(deleg_slab);
4004 out_free_stateid_slab:
4005 kmem_cache_destroy(stateid_slab);
4007 kmem_cache_destroy(file_slab);
4008 out_free_lockowner_slab:
4009 kmem_cache_destroy(lockowner_slab);
4010 out_free_openowner_slab:
4011 kmem_cache_destroy(openowner_slab);
4012 out_free_client_slab:
4013 kmem_cache_destroy(client_slab);
4015 dprintk("nfsd4: out of memory while initializing nfsv4\n");
4019 static void init_nfs4_replay(struct nfs4_replay *rp)
4021 rp->rp_status = nfserr_serverfault;
4023 rp->rp_buf = rp->rp_ibuf;
4024 mutex_init(&rp->rp_mutex);
4027 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4028 struct nfs4_stateowner *so)
4030 if (!nfsd4_has_session(cstate)) {
4031 mutex_lock(&so->so_replay.rp_mutex);
4032 cstate->replay_owner = nfs4_get_stateowner(so);
4036 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4038 struct nfs4_stateowner *so = cstate->replay_owner;
4041 cstate->replay_owner = NULL;
4042 mutex_unlock(&so->so_replay.rp_mutex);
4043 nfs4_put_stateowner(so);
4047 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4049 struct nfs4_stateowner *sop;
4051 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4055 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4056 if (!sop->so_owner.data) {
4057 kmem_cache_free(slab, sop);
4061 INIT_LIST_HEAD(&sop->so_stateids);
4062 sop->so_client = clp;
4063 init_nfs4_replay(&sop->so_replay);
4064 atomic_set(&sop->so_count, 1);
4068 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4070 lockdep_assert_held(&clp->cl_lock);
4072 list_add(&oo->oo_owner.so_strhash,
4073 &clp->cl_ownerstr_hashtbl[strhashval]);
4074 list_add(&oo->oo_perclient, &clp->cl_openowners);
4077 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4079 unhash_openowner_locked(openowner(so));
4082 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4084 struct nfs4_openowner *oo = openowner(so);
4086 kmem_cache_free(openowner_slab, oo);
4089 static const struct nfs4_stateowner_operations openowner_ops = {
4090 .so_unhash = nfs4_unhash_openowner,
4091 .so_free = nfs4_free_openowner,
4094 static struct nfs4_ol_stateid *
4095 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4097 struct nfs4_ol_stateid *local, *ret = NULL;
4098 struct nfs4_openowner *oo = open->op_openowner;
4100 lockdep_assert_held(&fp->fi_lock);
4102 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4103 /* ignore lock owners */
4104 if (local->st_stateowner->so_is_open_owner == 0)
4106 if (local->st_stateowner != &oo->oo_owner)
4108 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4110 refcount_inc(&ret->st_stid.sc_count);
4118 nfsd4_verify_open_stid(struct nfs4_stid *s)
4120 __be32 ret = nfs_ok;
4122 switch (s->sc_type) {
4126 case NFS4_CLOSED_STID:
4127 case NFS4_CLOSED_DELEG_STID:
4128 ret = nfserr_bad_stateid;
4130 case NFS4_REVOKED_DELEG_STID:
4131 ret = nfserr_deleg_revoked;
4136 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4138 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4142 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4143 ret = nfsd4_verify_open_stid(&stp->st_stid);
4145 mutex_unlock(&stp->st_mutex);
4149 static struct nfs4_ol_stateid *
4150 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4152 struct nfs4_ol_stateid *stp;
4154 spin_lock(&fp->fi_lock);
4155 stp = nfsd4_find_existing_open(fp, open);
4156 spin_unlock(&fp->fi_lock);
4157 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4159 nfs4_put_stid(&stp->st_stid);
4164 static struct nfs4_openowner *
4165 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4166 struct nfsd4_compound_state *cstate)
4168 struct nfs4_client *clp = cstate->clp;
4169 struct nfs4_openowner *oo, *ret;
4171 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4174 oo->oo_owner.so_ops = &openowner_ops;
4175 oo->oo_owner.so_is_open_owner = 1;
4176 oo->oo_owner.so_seqid = open->op_seqid;
4178 if (nfsd4_has_session(cstate))
4179 oo->oo_flags |= NFS4_OO_CONFIRMED;
4181 oo->oo_last_closed_stid = NULL;
4182 INIT_LIST_HEAD(&oo->oo_close_lru);
4183 spin_lock(&clp->cl_lock);
4184 ret = find_openstateowner_str_locked(strhashval, open, clp);
4186 hash_openowner(oo, clp, strhashval);
4189 nfs4_free_stateowner(&oo->oo_owner);
4191 spin_unlock(&clp->cl_lock);
4195 static struct nfs4_ol_stateid *
4196 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4199 struct nfs4_openowner *oo = open->op_openowner;
4200 struct nfs4_ol_stateid *retstp = NULL;
4201 struct nfs4_ol_stateid *stp;
4204 /* We are moving these outside of the spinlocks to avoid the warnings */
4205 mutex_init(&stp->st_mutex);
4206 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4209 spin_lock(&oo->oo_owner.so_client->cl_lock);
4210 spin_lock(&fp->fi_lock);
4212 retstp = nfsd4_find_existing_open(fp, open);
4216 open->op_stp = NULL;
4217 refcount_inc(&stp->st_stid.sc_count);
4218 stp->st_stid.sc_type = NFS4_OPEN_STID;
4219 INIT_LIST_HEAD(&stp->st_locks);
4220 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4222 stp->st_stid.sc_file = fp;
4223 stp->st_access_bmap = 0;
4224 stp->st_deny_bmap = 0;
4225 stp->st_openstp = NULL;
4226 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4227 list_add(&stp->st_perfile, &fp->fi_stateids);
4230 spin_unlock(&fp->fi_lock);
4231 spin_unlock(&oo->oo_owner.so_client->cl_lock);
4233 /* Handle races with CLOSE */
4234 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4235 nfs4_put_stid(&retstp->st_stid);
4238 /* To keep mutex tracking happy */
4239 mutex_unlock(&stp->st_mutex);
4246 * In the 4.0 case we need to keep the owners around a little while to handle
4247 * CLOSE replay. We still do need to release any file access that is held by
4248 * them before returning however.
4251 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4253 struct nfs4_ol_stateid *last;
4254 struct nfs4_openowner *oo = openowner(s->st_stateowner);
4255 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4258 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4261 * We know that we hold one reference via nfsd4_close, and another
4262 * "persistent" reference for the client. If the refcount is higher
4263 * than 2, then there are still calls in progress that are using this
4264 * stateid. We can't put the sc_file reference until they are finished.
4265 * Wait for the refcount to drop to 2. Since it has been unhashed,
4266 * there should be no danger of the refcount going back up again at
4269 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4271 release_all_access(s);
4272 if (s->st_stid.sc_file) {
4273 put_nfs4_file(s->st_stid.sc_file);
4274 s->st_stid.sc_file = NULL;
4277 spin_lock(&nn->client_lock);
4278 last = oo->oo_last_closed_stid;
4279 oo->oo_last_closed_stid = s;
4280 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4281 oo->oo_time = get_seconds();
4282 spin_unlock(&nn->client_lock);
4284 nfs4_put_stid(&last->st_stid);
4287 /* search file_hashtbl[] for file */
4288 static struct nfs4_file *
4289 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
4291 struct nfs4_file *fp;
4293 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
4294 if (fh_match(&fp->fi_fhandle, fh)) {
4295 if (refcount_inc_not_zero(&fp->fi_ref))
4303 find_file(struct knfsd_fh *fh)
4305 struct nfs4_file *fp;
4306 unsigned int hashval = file_hashval(fh);
4309 fp = find_file_locked(fh, hashval);
4314 static struct nfs4_file *
4315 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
4317 struct nfs4_file *fp;
4318 unsigned int hashval = file_hashval(fh);
4321 fp = find_file_locked(fh, hashval);
4326 spin_lock(&state_lock);
4327 fp = find_file_locked(fh, hashval);
4328 if (likely(fp == NULL)) {
4329 nfsd4_init_file(fh, hashval, new);
4332 spin_unlock(&state_lock);
4338 * Called to check deny when READ with all zero stateid or
4339 * WRITE with all zero or all one stateid
4342 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4344 struct nfs4_file *fp;
4345 __be32 ret = nfs_ok;
4347 fp = find_file(¤t_fh->fh_handle);
4350 /* Check for conflicting share reservations */
4351 spin_lock(&fp->fi_lock);
4352 if (fp->fi_share_deny & deny_type)
4353 ret = nfserr_locked;
4354 spin_unlock(&fp->fi_lock);
4359 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4361 struct nfs4_delegation *dp = cb_to_delegation(cb);
4362 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
4365 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
4368 * We can't do this in nfsd_break_deleg_cb because it is
4369 * already holding inode->i_lock.
4371 * If the dl_time != 0, then we know that it has already been
4372 * queued for a lease break. Don't queue it again.
4374 spin_lock(&state_lock);
4375 if (dp->dl_time == 0) {
4376 dp->dl_time = get_seconds();
4377 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
4379 spin_unlock(&state_lock);
4382 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4383 struct rpc_task *task)
4385 struct nfs4_delegation *dp = cb_to_delegation(cb);
4387 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
4390 switch (task->tk_status) {
4393 case -NFS4ERR_DELAY:
4394 rpc_delay(task, 2 * HZ);
4397 case -NFS4ERR_BAD_STATEID:
4399 * Race: client probably got cb_recall before open reply
4400 * granting delegation.
4402 if (dp->dl_retries--) {
4403 rpc_delay(task, 2 * HZ);
4412 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4414 struct nfs4_delegation *dp = cb_to_delegation(cb);
4416 nfs4_put_stid(&dp->dl_stid);
4419 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4420 .prepare = nfsd4_cb_recall_prepare,
4421 .done = nfsd4_cb_recall_done,
4422 .release = nfsd4_cb_recall_release,
4425 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4428 * We're assuming the state code never drops its reference
4429 * without first removing the lease. Since we're in this lease
4430 * callback (and since the lease code is serialized by the
4431 * i_lock) we know the server hasn't removed the lease yet, and
4432 * we know it's safe to take a reference.
4434 refcount_inc(&dp->dl_stid.sc_count);
4435 nfsd4_run_cb(&dp->dl_recall);
4438 /* Called from break_lease() with i_lock held. */
4440 nfsd_break_deleg_cb(struct file_lock *fl)
4443 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4444 struct nfs4_file *fp = dp->dl_stid.sc_file;
4447 * We don't want the locks code to timeout the lease for us;
4448 * we'll remove it ourself if a delegation isn't returned
4451 fl->fl_break_time = 0;
4453 spin_lock(&fp->fi_lock);
4454 fp->fi_had_conflict = true;
4455 nfsd_break_one_deleg(dp);
4456 spin_unlock(&fp->fi_lock);
4461 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
4462 struct list_head *dispose)
4465 return lease_modify(onlist, arg, dispose);
4470 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4471 .lm_break = nfsd_break_deleg_cb,
4472 .lm_change = nfsd_change_deleg_cb,
4475 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4477 if (nfsd4_has_session(cstate))
4479 if (seqid == so->so_seqid - 1)
4480 return nfserr_replay_me;
4481 if (seqid == so->so_seqid)
4483 return nfserr_bad_seqid;
4486 static __be32 lookup_clientid(clientid_t *clid,
4487 struct nfsd4_compound_state *cstate,
4488 struct nfsd_net *nn)
4490 struct nfs4_client *found;
4493 found = cstate->clp;
4494 if (!same_clid(&found->cl_clientid, clid))
4495 return nfserr_stale_clientid;
4499 if (STALE_CLIENTID(clid, nn))
4500 return nfserr_stale_clientid;
4503 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4504 * cached already then we know this is for is for v4.0 and "sessions"
4507 WARN_ON_ONCE(cstate->session);
4508 spin_lock(&nn->client_lock);
4509 found = find_confirmed_client(clid, false, nn);
4511 spin_unlock(&nn->client_lock);
4512 return nfserr_expired;
4514 atomic_inc(&found->cl_rpc_users);
4515 spin_unlock(&nn->client_lock);
4517 /* Cache the nfs4_client in cstate! */
4518 cstate->clp = found;
4523 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4524 struct nfsd4_open *open, struct nfsd_net *nn)
4526 clientid_t *clientid = &open->op_clientid;
4527 struct nfs4_client *clp = NULL;
4528 unsigned int strhashval;
4529 struct nfs4_openowner *oo = NULL;
4532 if (STALE_CLIENTID(&open->op_clientid, nn))
4533 return nfserr_stale_clientid;
4535 * In case we need it later, after we've already created the
4536 * file and don't want to risk a further failure:
4538 open->op_file = nfsd4_alloc_file();
4539 if (open->op_file == NULL)
4540 return nfserr_jukebox;
4542 status = lookup_clientid(clientid, cstate, nn);
4547 strhashval = ownerstr_hashval(&open->op_owner);
4548 oo = find_openstateowner_str(strhashval, open, clp);
4549 open->op_openowner = oo;
4553 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4554 /* Replace unconfirmed owners without checking for replay. */
4555 release_openowner(oo);
4556 open->op_openowner = NULL;
4559 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4564 oo = alloc_init_open_stateowner(strhashval, open, cstate);
4566 return nfserr_jukebox;
4567 open->op_openowner = oo;
4569 open->op_stp = nfs4_alloc_open_stateid(clp);
4571 return nfserr_jukebox;
4573 if (nfsd4_has_session(cstate) &&
4574 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4575 open->op_odstate = alloc_clnt_odstate(clp);
4576 if (!open->op_odstate)
4577 return nfserr_jukebox;
4583 static inline __be32
4584 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4586 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4587 return nfserr_openmode;
4592 static int share_access_to_flags(u32 share_access)
4594 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4597 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4599 struct nfs4_stid *ret;
4601 ret = find_stateid_by_type(cl, s,
4602 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4605 return delegstateid(ret);
4608 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4610 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4611 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4615 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4616 struct nfs4_delegation **dp)
4619 __be32 status = nfserr_bad_stateid;
4620 struct nfs4_delegation *deleg;
4622 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4625 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4626 nfs4_put_stid(&deleg->dl_stid);
4627 if (cl->cl_minorversion)
4628 status = nfserr_deleg_revoked;
4631 flags = share_access_to_flags(open->op_share_access);
4632 status = nfs4_check_delegmode(deleg, flags);
4634 nfs4_put_stid(&deleg->dl_stid);
4639 if (!nfsd4_is_deleg_cur(open))
4643 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4647 static inline int nfs4_access_to_access(u32 nfs4_access)
4651 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4652 flags |= NFSD_MAY_READ;
4653 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4654 flags |= NFSD_MAY_WRITE;
4658 static inline __be32
4659 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4660 struct nfsd4_open *open)
4662 struct iattr iattr = {
4663 .ia_valid = ATTR_SIZE,
4666 if (!open->op_truncate)
4668 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4669 return nfserr_inval;
4670 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4673 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4674 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4675 struct nfsd4_open *open)
4677 struct nfsd_file *nf = NULL;
4679 int oflag = nfs4_access_to_omode(open->op_share_access);
4680 int access = nfs4_access_to_access(open->op_share_access);
4681 unsigned char old_access_bmap, old_deny_bmap;
4683 spin_lock(&fp->fi_lock);
4686 * Are we trying to set a deny mode that would conflict with
4689 status = nfs4_file_check_deny(fp, open->op_share_deny);
4690 if (status != nfs_ok) {
4691 spin_unlock(&fp->fi_lock);
4695 /* set access to the file */
4696 status = nfs4_file_get_access(fp, open->op_share_access);
4697 if (status != nfs_ok) {
4698 spin_unlock(&fp->fi_lock);
4702 /* Set access bits in stateid */
4703 old_access_bmap = stp->st_access_bmap;
4704 set_access(open->op_share_access, stp);
4706 /* Set new deny mask */
4707 old_deny_bmap = stp->st_deny_bmap;
4708 set_deny(open->op_share_deny, stp);
4709 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4711 if (!fp->fi_fds[oflag]) {
4712 spin_unlock(&fp->fi_lock);
4713 status = nfsd_file_acquire(rqstp, cur_fh, access, &nf);
4715 goto out_put_access;
4716 spin_lock(&fp->fi_lock);
4717 if (!fp->fi_fds[oflag]) {
4718 fp->fi_fds[oflag] = nf;
4722 spin_unlock(&fp->fi_lock);
4726 status = nfsd4_truncate(rqstp, cur_fh, open);
4728 goto out_put_access;
4732 stp->st_access_bmap = old_access_bmap;
4733 nfs4_file_put_access(fp, open->op_share_access);
4734 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4739 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)
4742 unsigned char old_deny_bmap = stp->st_deny_bmap;
4744 if (!test_access(open->op_share_access, stp))
4745 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4747 /* test and set deny mode */
4748 spin_lock(&fp->fi_lock);
4749 status = nfs4_file_check_deny(fp, open->op_share_deny);
4750 if (status == nfs_ok) {
4751 set_deny(open->op_share_deny, stp);
4752 fp->fi_share_deny |=
4753 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4755 spin_unlock(&fp->fi_lock);
4757 if (status != nfs_ok)
4760 status = nfsd4_truncate(rqstp, cur_fh, open);
4761 if (status != nfs_ok)
4762 reset_union_bmap_deny(old_deny_bmap, stp);
4766 /* Should we give out recallable state?: */
4767 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4769 if (clp->cl_cb_state == NFSD4_CB_UP)
4772 * In the sessions case, since we don't have to establish a
4773 * separate connection for callbacks, we assume it's OK
4774 * until we hear otherwise:
4776 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4779 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
4782 struct file_lock *fl;
4784 fl = locks_alloc_lock();
4787 fl->fl_lmops = &nfsd_lease_mng_ops;
4788 fl->fl_flags = FL_DELEG;
4789 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4790 fl->fl_end = OFFSET_MAX;
4791 fl->fl_owner = (fl_owner_t)dp;
4792 fl->fl_pid = current->tgid;
4793 fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
4797 static struct nfs4_delegation *
4798 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4799 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4802 struct nfs4_delegation *dp;
4803 struct nfsd_file *nf;
4804 struct file_lock *fl;
4807 * The fi_had_conflict and nfs_get_existing_delegation checks
4808 * here are just optimizations; we'll need to recheck them at
4811 if (fp->fi_had_conflict)
4812 return ERR_PTR(-EAGAIN);
4814 nf = find_readable_file(fp);
4816 /* We should always have a readable file here */
4818 return ERR_PTR(-EBADF);
4820 spin_lock(&state_lock);
4821 spin_lock(&fp->fi_lock);
4822 if (nfs4_delegation_exists(clp, fp))
4824 else if (!fp->fi_deleg_file) {
4825 fp->fi_deleg_file = nf;
4826 /* increment early to prevent fi_deleg_file from being
4828 fp->fi_delegees = 1;
4832 spin_unlock(&fp->fi_lock);
4833 spin_unlock(&state_lock);
4837 return ERR_PTR(status);
4840 dp = alloc_init_deleg(clp, fp, fh, odstate);
4844 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
4846 goto out_clnt_odstate;
4848 status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
4850 locks_free_lock(fl);
4852 goto out_clnt_odstate;
4854 spin_lock(&state_lock);
4855 spin_lock(&fp->fi_lock);
4856 if (fp->fi_had_conflict)
4859 status = hash_delegation_locked(dp, fp);
4860 spin_unlock(&fp->fi_lock);
4861 spin_unlock(&state_lock);
4868 vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
4870 put_clnt_odstate(dp->dl_clnt_odstate);
4871 nfs4_put_stid(&dp->dl_stid);
4874 return ERR_PTR(status);
4877 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4879 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4880 if (status == -EAGAIN)
4881 open->op_why_no_deleg = WND4_CONTENTION;
4883 open->op_why_no_deleg = WND4_RESOURCE;
4884 switch (open->op_deleg_want) {
4885 case NFS4_SHARE_WANT_READ_DELEG:
4886 case NFS4_SHARE_WANT_WRITE_DELEG:
4887 case NFS4_SHARE_WANT_ANY_DELEG:
4889 case NFS4_SHARE_WANT_CANCEL:
4890 open->op_why_no_deleg = WND4_CANCELLED;
4892 case NFS4_SHARE_WANT_NO_DELEG:
4899 * Attempt to hand out a delegation.
4901 * Note we don't support write delegations, and won't until the vfs has
4902 * proper support for them.
4905 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4906 struct nfs4_ol_stateid *stp)
4908 struct nfs4_delegation *dp;
4909 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4910 struct nfs4_client *clp = stp->st_stid.sc_client;
4914 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4915 open->op_recall = 0;
4916 switch (open->op_claim_type) {
4917 case NFS4_OPEN_CLAIM_PREVIOUS:
4919 open->op_recall = 1;
4920 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4923 case NFS4_OPEN_CLAIM_NULL:
4924 case NFS4_OPEN_CLAIM_FH:
4926 * Let's not give out any delegations till everyone's
4927 * had the chance to reclaim theirs, *and* until
4928 * NLM locks have all been reclaimed:
4930 if (locks_in_grace(clp->net))
4932 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4935 * Also, if the file was opened for write or
4936 * create, there's a good chance the client's
4937 * about to write to it, resulting in an
4938 * immediate recall (since we don't support
4939 * write delegations):
4941 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4943 if (open->op_create == NFS4_OPEN_CREATE)
4949 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4953 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4955 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4956 STATEID_VAL(&dp->dl_stid.sc_stateid));
4957 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4958 nfs4_put_stid(&dp->dl_stid);
4961 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4962 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4963 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4964 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4965 open->op_recall = 1;
4968 /* 4.1 client asking for a delegation? */
4969 if (open->op_deleg_want)
4970 nfsd4_open_deleg_none_ext(open, status);
4974 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4975 struct nfs4_delegation *dp)
4977 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4978 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4979 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4980 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4981 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4982 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4983 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4984 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4986 /* Otherwise the client must be confused wanting a delegation
4987 * it already has, therefore we don't return
4988 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4993 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4995 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4996 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4997 struct nfs4_file *fp = NULL;
4998 struct nfs4_ol_stateid *stp = NULL;
4999 struct nfs4_delegation *dp = NULL;
5001 bool new_stp = false;
5004 * Lookup file; if found, lookup stateid and check open request,
5005 * and check for delegations in the process of being recalled.
5006 * If not found, create the nfs4_file struct
5008 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
5009 if (fp != open->op_file) {
5010 status = nfs4_check_deleg(cl, open, &dp);
5013 stp = nfsd4_find_and_lock_existing_open(fp, open);
5015 open->op_file = NULL;
5016 status = nfserr_bad_stateid;
5017 if (nfsd4_is_deleg_cur(open))
5022 stp = init_open_stateid(fp, open);
5028 * OPEN the file, or upgrade an existing OPEN.
5029 * If truncate fails, the OPEN fails.
5031 * stp is already locked.
5034 /* Stateid was found, this is an OPEN upgrade */
5035 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
5037 mutex_unlock(&stp->st_mutex);
5041 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
5043 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5044 release_open_stateid(stp);
5045 mutex_unlock(&stp->st_mutex);
5049 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5051 if (stp->st_clnt_odstate == open->op_odstate)
5052 open->op_odstate = NULL;
5055 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
5056 mutex_unlock(&stp->st_mutex);
5058 if (nfsd4_has_session(&resp->cstate)) {
5059 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5060 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5061 open->op_why_no_deleg = WND4_NOT_WANTED;
5067 * Attempt to hand out a delegation. No error return, because the
5068 * OPEN succeeds even if we fail.
5070 nfs4_open_delegation(current_fh, open, stp);
5074 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
5075 STATEID_VAL(&stp->st_stid.sc_stateid));
5077 /* 4.1 client trying to upgrade/downgrade delegation? */
5078 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5079 open->op_deleg_want)
5080 nfsd4_deleg_xgrade_none_ext(open, dp);
5084 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5085 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5087 * To finish the open response, we just need to set the rflags.
5089 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5090 if (nfsd4_has_session(&resp->cstate))
5091 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5092 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5093 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5096 nfs4_put_stid(&dp->dl_stid);
5098 nfs4_put_stid(&stp->st_stid);
5103 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5104 struct nfsd4_open *open)
5106 if (open->op_openowner) {
5107 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5109 nfsd4_cstate_assign_replay(cstate, so);
5110 nfs4_put_stateowner(so);
5113 kmem_cache_free(file_slab, open->op_file);
5115 nfs4_put_stid(&open->op_stp->st_stid);
5116 if (open->op_odstate)
5117 kmem_cache_free(odstate_slab, open->op_odstate);
5121 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5122 union nfsd4_op_u *u)
5124 clientid_t *clid = &u->renew;
5125 struct nfs4_client *clp;
5127 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5129 dprintk("process_renew(%08x/%08x): starting\n",
5130 clid->cl_boot, clid->cl_id);
5131 status = lookup_clientid(clid, cstate, nn);
5135 status = nfserr_cb_path_down;
5136 if (!list_empty(&clp->cl_delegations)
5137 && clp->cl_cb_state != NFSD4_CB_UP)
5145 nfsd4_end_grace(struct nfsd_net *nn)
5147 /* do nothing if grace period already ended */
5148 if (nn->grace_ended)
5151 nn->grace_ended = true;
5153 * If the server goes down again right now, an NFSv4
5154 * client will still be allowed to reclaim after it comes back up,
5155 * even if it hasn't yet had a chance to reclaim state this time.
5158 nfsd4_record_grace_done(nn);
5160 * At this point, NFSv4 clients can still reclaim. But if the
5161 * server crashes, any that have not yet reclaimed will be out
5162 * of luck on the next boot.
5164 * (NFSv4.1+ clients are considered to have reclaimed once they
5165 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
5166 * have reclaimed after their first OPEN.)
5168 locks_end_grace(&nn->nfsd4_manager);
5170 * At this point, and once lockd and/or any other containers
5171 * exit their grace period, further reclaims will fail and
5172 * regular locking can resume.
5177 * If we've waited a lease period but there are still clients trying to
5178 * reclaim, wait a little longer to give them a chance to finish.
5180 static bool clients_still_reclaiming(struct nfsd_net *nn)
5182 unsigned long now = get_seconds();
5183 unsigned long double_grace_period_end = nn->boot_time +
5184 2 * nn->nfsd4_lease;
5186 if (nn->track_reclaim_completes &&
5187 atomic_read(&nn->nr_reclaim_complete) ==
5188 nn->reclaim_str_hashtbl_size)
5190 if (!nn->somebody_reclaimed)
5192 nn->somebody_reclaimed = false;
5194 * If we've given them *two* lease times to reclaim, and they're
5195 * still not done, give up:
5197 if (time_after(now, double_grace_period_end))
5203 nfs4_laundromat(struct nfsd_net *nn)
5205 struct nfs4_client *clp;
5206 struct nfs4_openowner *oo;
5207 struct nfs4_delegation *dp;
5208 struct nfs4_ol_stateid *stp;
5209 struct nfsd4_blocked_lock *nbl;
5210 struct list_head *pos, *next, reaplist;
5211 time_t cutoff = get_seconds() - nn->nfsd4_lease;
5212 time_t t, new_timeo = nn->nfsd4_lease;
5214 dprintk("NFSD: laundromat service - starting\n");
5216 if (clients_still_reclaiming(nn)) {
5220 dprintk("NFSD: end of grace period\n");
5221 nfsd4_end_grace(nn);
5222 INIT_LIST_HEAD(&reaplist);
5223 spin_lock(&nn->client_lock);
5224 list_for_each_safe(pos, next, &nn->client_lru) {
5225 clp = list_entry(pos, struct nfs4_client, cl_lru);
5226 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
5227 t = clp->cl_time - cutoff;
5228 new_timeo = min(new_timeo, t);
5231 if (mark_client_expired_locked(clp)) {
5232 dprintk("NFSD: client in use (clientid %08x)\n",
5233 clp->cl_clientid.cl_id);
5236 list_add(&clp->cl_lru, &reaplist);
5238 spin_unlock(&nn->client_lock);
5239 list_for_each_safe(pos, next, &reaplist) {
5240 clp = list_entry(pos, struct nfs4_client, cl_lru);
5241 dprintk("NFSD: purging unused client (clientid %08x)\n",
5242 clp->cl_clientid.cl_id);
5243 list_del_init(&clp->cl_lru);
5246 spin_lock(&state_lock);
5247 list_for_each_safe(pos, next, &nn->del_recall_lru) {
5248 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5249 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
5250 t = dp->dl_time - cutoff;
5251 new_timeo = min(new_timeo, t);
5254 WARN_ON(!unhash_delegation_locked(dp));
5255 list_add(&dp->dl_recall_lru, &reaplist);
5257 spin_unlock(&state_lock);
5258 while (!list_empty(&reaplist)) {
5259 dp = list_first_entry(&reaplist, struct nfs4_delegation,
5261 list_del_init(&dp->dl_recall_lru);
5262 revoke_delegation(dp);
5265 spin_lock(&nn->client_lock);
5266 while (!list_empty(&nn->close_lru)) {
5267 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
5269 if (time_after((unsigned long)oo->oo_time,
5270 (unsigned long)cutoff)) {
5271 t = oo->oo_time - cutoff;
5272 new_timeo = min(new_timeo, t);
5275 list_del_init(&oo->oo_close_lru);
5276 stp = oo->oo_last_closed_stid;
5277 oo->oo_last_closed_stid = NULL;
5278 spin_unlock(&nn->client_lock);
5279 nfs4_put_stid(&stp->st_stid);
5280 spin_lock(&nn->client_lock);
5282 spin_unlock(&nn->client_lock);
5285 * It's possible for a client to try and acquire an already held lock
5286 * that is being held for a long time, and then lose interest in it.
5287 * So, we clean out any un-revisited request after a lease period
5288 * under the assumption that the client is no longer interested.
5290 * RFC5661, sec. 9.6 states that the client must not rely on getting
5291 * notifications and must continue to poll for locks, even when the
5292 * server supports them. Thus this shouldn't lead to clients blocking
5293 * indefinitely once the lock does become free.
5295 BUG_ON(!list_empty(&reaplist));
5296 spin_lock(&nn->blocked_locks_lock);
5297 while (!list_empty(&nn->blocked_locks_lru)) {
5298 nbl = list_first_entry(&nn->blocked_locks_lru,
5299 struct nfsd4_blocked_lock, nbl_lru);
5300 if (time_after((unsigned long)nbl->nbl_time,
5301 (unsigned long)cutoff)) {
5302 t = nbl->nbl_time - cutoff;
5303 new_timeo = min(new_timeo, t);
5306 list_move(&nbl->nbl_lru, &reaplist);
5307 list_del_init(&nbl->nbl_list);
5309 spin_unlock(&nn->blocked_locks_lock);
5311 while (!list_empty(&reaplist)) {
5312 nbl = list_first_entry(&reaplist,
5313 struct nfsd4_blocked_lock, nbl_lru);
5314 list_del_init(&nbl->nbl_lru);
5315 free_blocked_lock(nbl);
5318 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
5322 static struct workqueue_struct *laundry_wq;
5323 static void laundromat_main(struct work_struct *);
5326 laundromat_main(struct work_struct *laundry)
5329 struct delayed_work *dwork = to_delayed_work(laundry);
5330 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
5333 t = nfs4_laundromat(nn);
5334 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
5335 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
5338 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
5340 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
5341 return nfserr_bad_stateid;
5346 access_permit_read(struct nfs4_ol_stateid *stp)
5348 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
5349 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
5350 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
5354 access_permit_write(struct nfs4_ol_stateid *stp)
5356 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
5357 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
5361 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
5363 __be32 status = nfserr_openmode;
5365 /* For lock stateid's, we test the parent open, not the lock: */
5366 if (stp->st_openstp)
5367 stp = stp->st_openstp;
5368 if ((flags & WR_STATE) && !access_permit_write(stp))
5370 if ((flags & RD_STATE) && !access_permit_read(stp))
5377 static inline __be32
5378 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
5380 if (ONE_STATEID(stateid) && (flags & RD_STATE))
5382 else if (opens_in_grace(net)) {
5383 /* Answer in remaining cases depends on existence of
5384 * conflicting state; so we must wait out the grace period. */
5385 return nfserr_grace;
5386 } else if (flags & WR_STATE)
5387 return nfs4_share_conflict(current_fh,
5388 NFS4_SHARE_DENY_WRITE);
5389 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
5390 return nfs4_share_conflict(current_fh,
5391 NFS4_SHARE_DENY_READ);
5395 * Allow READ/WRITE during grace period on recovered state only for files
5396 * that are not able to provide mandatory locking.
5399 grace_disallows_io(struct net *net, struct inode *inode)
5401 return opens_in_grace(net) && mandatory_lock(inode);
5404 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
5407 * When sessions are used the stateid generation number is ignored
5410 if (has_session && in->si_generation == 0)
5413 if (in->si_generation == ref->si_generation)
5416 /* If the client sends us a stateid from the future, it's buggy: */
5417 if (nfsd4_stateid_generation_after(in, ref))
5418 return nfserr_bad_stateid;
5420 * However, we could see a stateid from the past, even from a
5421 * non-buggy client. For example, if the client sends a lock
5422 * while some IO is outstanding, the lock may bump si_generation
5423 * while the IO is still in flight. The client could avoid that
5424 * situation by waiting for responses on all the IO requests,
5425 * but better performance may result in retrying IO that
5426 * receives an old_stateid error if requests are rarely
5427 * reordered in flight:
5429 return nfserr_old_stateid;
5432 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
5436 spin_lock(&s->sc_lock);
5437 ret = nfsd4_verify_open_stid(s);
5439 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
5440 spin_unlock(&s->sc_lock);
5444 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
5446 if (ols->st_stateowner->so_is_open_owner &&
5447 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
5448 return nfserr_bad_stateid;
5452 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
5454 struct nfs4_stid *s;
5455 __be32 status = nfserr_bad_stateid;
5457 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5458 CLOSE_STATEID(stateid))
5460 /* Client debugging aid. */
5461 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
5462 char addr_str[INET6_ADDRSTRLEN];
5463 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
5465 pr_warn_ratelimited("NFSD: client %s testing state ID "
5466 "with incorrect client ID\n", addr_str);
5469 spin_lock(&cl->cl_lock);
5470 s = find_stateid_locked(cl, stateid);
5473 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
5476 switch (s->sc_type) {
5477 case NFS4_DELEG_STID:
5480 case NFS4_REVOKED_DELEG_STID:
5481 status = nfserr_deleg_revoked;
5483 case NFS4_OPEN_STID:
5484 case NFS4_LOCK_STID:
5485 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
5488 printk("unknown stateid type %x\n", s->sc_type);
5490 case NFS4_CLOSED_STID:
5491 case NFS4_CLOSED_DELEG_STID:
5492 status = nfserr_bad_stateid;
5495 spin_unlock(&cl->cl_lock);
5500 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
5501 stateid_t *stateid, unsigned char typemask,
5502 struct nfs4_stid **s, struct nfsd_net *nn)
5505 bool return_revoked = false;
5508 * only return revoked delegations if explicitly asked.
5509 * otherwise we report revoked or bad_stateid status.
5511 if (typemask & NFS4_REVOKED_DELEG_STID)
5512 return_revoked = true;
5513 else if (typemask & NFS4_DELEG_STID)
5514 typemask |= NFS4_REVOKED_DELEG_STID;
5516 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5517 CLOSE_STATEID(stateid))
5518 return nfserr_bad_stateid;
5519 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
5520 if (status == nfserr_stale_clientid) {
5521 if (cstate->session)
5522 return nfserr_bad_stateid;
5523 return nfserr_stale_stateid;
5527 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5529 return nfserr_bad_stateid;
5530 if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5532 if (cstate->minorversion)
5533 return nfserr_deleg_revoked;
5534 return nfserr_bad_stateid;
5539 static struct nfsd_file *
5540 nfs4_find_file(struct nfs4_stid *s, int flags)
5545 switch (s->sc_type) {
5546 case NFS4_DELEG_STID:
5547 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5549 return nfsd_file_get(s->sc_file->fi_deleg_file);
5550 case NFS4_OPEN_STID:
5551 case NFS4_LOCK_STID:
5552 if (flags & RD_STATE)
5553 return find_readable_file(s->sc_file);
5555 return find_writeable_file(s->sc_file);
5563 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
5567 status = nfsd4_check_openowner_confirmed(ols);
5570 return nfs4_check_openmode(ols, flags);
5574 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5575 struct nfsd_file **nfp, int flags)
5577 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5578 struct nfsd_file *nf;
5581 nf = nfs4_find_file(s, flags);
5583 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5584 acc | NFSD_MAY_OWNER_OVERRIDE);
5590 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
5600 * Checks for stateid operations
5603 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5604 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5605 stateid_t *stateid, int flags, struct nfsd_file **nfp)
5607 struct inode *ino = d_inode(fhp->fh_dentry);
5608 struct net *net = SVC_NET(rqstp);
5609 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5610 struct nfs4_stid *s = NULL;
5616 if (grace_disallows_io(net, ino))
5617 return nfserr_grace;
5619 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5620 status = check_special_stateids(net, fhp, stateid, flags);
5624 status = nfsd4_lookup_stateid(cstate, stateid,
5625 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5629 status = nfsd4_stid_check_stateid_generation(stateid, s,
5630 nfsd4_has_session(cstate));
5634 switch (s->sc_type) {
5635 case NFS4_DELEG_STID:
5636 status = nfs4_check_delegmode(delegstateid(s), flags);
5638 case NFS4_OPEN_STID:
5639 case NFS4_LOCK_STID:
5640 status = nfs4_check_olstateid(openlockstateid(s), flags);
5643 status = nfserr_bad_stateid;
5648 status = nfs4_check_fh(fhp, s);
5651 if (status == nfs_ok && nfp)
5652 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
5660 * Test if the stateid is valid
5663 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5664 union nfsd4_op_u *u)
5666 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5667 struct nfsd4_test_stateid_id *stateid;
5668 struct nfs4_client *cl = cstate->session->se_client;
5670 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5671 stateid->ts_id_status =
5672 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5678 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5680 struct nfs4_ol_stateid *stp = openlockstateid(s);
5683 ret = nfsd4_lock_ol_stateid(stp);
5687 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5691 ret = nfserr_locks_held;
5692 if (check_for_locks(stp->st_stid.sc_file,
5693 lockowner(stp->st_stateowner)))
5696 release_lock_stateid(stp);
5700 mutex_unlock(&stp->st_mutex);
5707 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5708 union nfsd4_op_u *u)
5710 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5711 stateid_t *stateid = &free_stateid->fr_stateid;
5712 struct nfs4_stid *s;
5713 struct nfs4_delegation *dp;
5714 struct nfs4_client *cl = cstate->session->se_client;
5715 __be32 ret = nfserr_bad_stateid;
5717 spin_lock(&cl->cl_lock);
5718 s = find_stateid_locked(cl, stateid);
5721 spin_lock(&s->sc_lock);
5722 switch (s->sc_type) {
5723 case NFS4_DELEG_STID:
5724 ret = nfserr_locks_held;
5726 case NFS4_OPEN_STID:
5727 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5730 ret = nfserr_locks_held;
5732 case NFS4_LOCK_STID:
5733 spin_unlock(&s->sc_lock);
5734 refcount_inc(&s->sc_count);
5735 spin_unlock(&cl->cl_lock);
5736 ret = nfsd4_free_lock_stateid(stateid, s);
5738 case NFS4_REVOKED_DELEG_STID:
5739 spin_unlock(&s->sc_lock);
5740 dp = delegstateid(s);
5741 list_del_init(&dp->dl_recall_lru);
5742 spin_unlock(&cl->cl_lock);
5746 /* Default falls through and returns nfserr_bad_stateid */
5748 spin_unlock(&s->sc_lock);
5750 spin_unlock(&cl->cl_lock);
5758 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5759 RD_STATE : WR_STATE;
5762 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5764 struct svc_fh *current_fh = &cstate->current_fh;
5765 struct nfs4_stateowner *sop = stp->st_stateowner;
5768 status = nfsd4_check_seqid(cstate, sop, seqid);
5771 status = nfsd4_lock_ol_stateid(stp);
5772 if (status != nfs_ok)
5774 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5775 if (status == nfs_ok)
5776 status = nfs4_check_fh(current_fh, &stp->st_stid);
5777 if (status != nfs_ok)
5778 mutex_unlock(&stp->st_mutex);
5783 * Checks for sequence id mutating operations.
5786 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5787 stateid_t *stateid, char typemask,
5788 struct nfs4_ol_stateid **stpp,
5789 struct nfsd_net *nn)
5792 struct nfs4_stid *s;
5793 struct nfs4_ol_stateid *stp = NULL;
5795 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5796 seqid, STATEID_VAL(stateid));
5799 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5802 stp = openlockstateid(s);
5803 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5805 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5809 nfs4_put_stid(&stp->st_stid);
5813 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5814 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5817 struct nfs4_openowner *oo;
5818 struct nfs4_ol_stateid *stp;
5820 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5821 NFS4_OPEN_STID, &stp, nn);
5824 oo = openowner(stp->st_stateowner);
5825 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5826 mutex_unlock(&stp->st_mutex);
5827 nfs4_put_stid(&stp->st_stid);
5828 return nfserr_bad_stateid;
5835 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5836 union nfsd4_op_u *u)
5838 struct nfsd4_open_confirm *oc = &u->open_confirm;
5840 struct nfs4_openowner *oo;
5841 struct nfs4_ol_stateid *stp;
5842 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5844 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5845 cstate->current_fh.fh_dentry);
5847 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5851 status = nfs4_preprocess_seqid_op(cstate,
5852 oc->oc_seqid, &oc->oc_req_stateid,
5853 NFS4_OPEN_STID, &stp, nn);
5856 oo = openowner(stp->st_stateowner);
5857 status = nfserr_bad_stateid;
5858 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5859 mutex_unlock(&stp->st_mutex);
5862 oo->oo_flags |= NFS4_OO_CONFIRMED;
5863 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5864 mutex_unlock(&stp->st_mutex);
5865 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5866 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5868 nfsd4_client_record_create(oo->oo_owner.so_client);
5871 nfs4_put_stid(&stp->st_stid);
5873 nfsd4_bump_seqid(cstate, status);
5877 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5879 if (!test_access(access, stp))
5881 nfs4_file_put_access(stp->st_stid.sc_file, access);
5882 clear_access(access, stp);
5885 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5887 switch (to_access) {
5888 case NFS4_SHARE_ACCESS_READ:
5889 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5890 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5892 case NFS4_SHARE_ACCESS_WRITE:
5893 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5894 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5896 case NFS4_SHARE_ACCESS_BOTH:
5904 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5905 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
5907 struct nfsd4_open_downgrade *od = &u->open_downgrade;
5909 struct nfs4_ol_stateid *stp;
5910 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5912 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5913 cstate->current_fh.fh_dentry);
5915 /* We don't yet support WANT bits: */
5916 if (od->od_deleg_want)
5917 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5920 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5921 &od->od_stateid, &stp, nn);
5924 status = nfserr_inval;
5925 if (!test_access(od->od_share_access, stp)) {
5926 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5927 stp->st_access_bmap, od->od_share_access);
5930 if (!test_deny(od->od_share_deny, stp)) {
5931 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5932 stp->st_deny_bmap, od->od_share_deny);
5935 nfs4_stateid_downgrade(stp, od->od_share_access);
5936 reset_union_bmap_deny(od->od_share_deny, stp);
5937 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5940 mutex_unlock(&stp->st_mutex);
5941 nfs4_put_stid(&stp->st_stid);
5943 nfsd4_bump_seqid(cstate, status);
5947 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5949 struct nfs4_client *clp = s->st_stid.sc_client;
5951 LIST_HEAD(reaplist);
5953 spin_lock(&clp->cl_lock);
5954 unhashed = unhash_open_stateid(s, &reaplist);
5956 if (clp->cl_minorversion) {
5958 put_ol_stateid_locked(s, &reaplist);
5959 spin_unlock(&clp->cl_lock);
5960 free_ol_stateid_reaplist(&reaplist);
5962 spin_unlock(&clp->cl_lock);
5963 free_ol_stateid_reaplist(&reaplist);
5965 move_to_close_lru(s, clp->net);
5970 * nfs4_unlock_state() called after encode
5973 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5974 union nfsd4_op_u *u)
5976 struct nfsd4_close *close = &u->close;
5978 struct nfs4_ol_stateid *stp;
5979 struct net *net = SVC_NET(rqstp);
5980 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5982 dprintk("NFSD: nfsd4_close on file %pd\n",
5983 cstate->current_fh.fh_dentry);
5985 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5987 NFS4_OPEN_STID|NFS4_CLOSED_STID,
5989 nfsd4_bump_seqid(cstate, status);
5993 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5996 * Technically we don't _really_ have to increment or copy it, since
5997 * it should just be gone after this operation and we clobber the
5998 * copied value below, but we continue to do so here just to ensure
5999 * that racing ops see that there was a state change.
6001 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
6003 nfsd4_close_open_stateid(stp);
6004 mutex_unlock(&stp->st_mutex);
6006 /* v4.1+ suggests that we send a special stateid in here, since the
6007 * clients should just ignore this anyway. Since this is not useful
6008 * for v4.0 clients either, we set it to the special close_stateid
6011 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
6013 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
6015 /* put reference from nfs4_preprocess_seqid_op */
6016 nfs4_put_stid(&stp->st_stid);
6022 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6023 union nfsd4_op_u *u)
6025 struct nfsd4_delegreturn *dr = &u->delegreturn;
6026 struct nfs4_delegation *dp;
6027 stateid_t *stateid = &dr->dr_stateid;
6028 struct nfs4_stid *s;
6030 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6032 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6035 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
6038 dp = delegstateid(s);
6039 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
6043 destroy_delegation(dp);
6045 nfs4_put_stid(&dp->dl_stid);
6051 end_offset(u64 start, u64 len)
6056 return end >= start ? end: NFS4_MAX_UINT64;
6059 /* last octet in a range */
6061 last_byte_offset(u64 start, u64 len)
6067 return end > start ? end - 1: NFS4_MAX_UINT64;
6071 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
6072 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
6073 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
6074 * locking, this prevents us from being completely protocol-compliant. The
6075 * real solution to this problem is to start using unsigned file offsets in
6076 * the VFS, but this is a very deep change!
6079 nfs4_transform_lock_offset(struct file_lock *lock)
6081 if (lock->fl_start < 0)
6082 lock->fl_start = OFFSET_MAX;
6083 if (lock->fl_end < 0)
6084 lock->fl_end = OFFSET_MAX;
6088 nfsd4_fl_get_owner(fl_owner_t owner)
6090 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6092 nfs4_get_stateowner(&lo->lo_owner);
6097 nfsd4_fl_put_owner(fl_owner_t owner)
6099 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6102 nfs4_put_stateowner(&lo->lo_owner);
6106 nfsd4_lm_notify(struct file_lock *fl)
6108 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
6109 struct net *net = lo->lo_owner.so_client->net;
6110 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6111 struct nfsd4_blocked_lock *nbl = container_of(fl,
6112 struct nfsd4_blocked_lock, nbl_lock);
6115 /* An empty list means that something else is going to be using it */
6116 spin_lock(&nn->blocked_locks_lock);
6117 if (!list_empty(&nbl->nbl_list)) {
6118 list_del_init(&nbl->nbl_list);
6119 list_del_init(&nbl->nbl_lru);
6122 spin_unlock(&nn->blocked_locks_lock);
6125 nfsd4_run_cb(&nbl->nbl_cb);
6128 static const struct lock_manager_operations nfsd_posix_mng_ops = {
6129 .lm_notify = nfsd4_lm_notify,
6130 .lm_get_owner = nfsd4_fl_get_owner,
6131 .lm_put_owner = nfsd4_fl_put_owner,
6135 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
6137 struct nfs4_lockowner *lo;
6139 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
6140 lo = (struct nfs4_lockowner *) fl->fl_owner;
6141 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
6143 if (!deny->ld_owner.data)
6144 /* We just don't care that much */
6146 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
6149 deny->ld_owner.len = 0;
6150 deny->ld_owner.data = NULL;
6151 deny->ld_clientid.cl_boot = 0;
6152 deny->ld_clientid.cl_id = 0;
6154 deny->ld_start = fl->fl_start;
6155 deny->ld_length = NFS4_MAX_UINT64;
6156 if (fl->fl_end != NFS4_MAX_UINT64)
6157 deny->ld_length = fl->fl_end - fl->fl_start + 1;
6158 deny->ld_type = NFS4_READ_LT;
6159 if (fl->fl_type != F_RDLCK)
6160 deny->ld_type = NFS4_WRITE_LT;
6163 static struct nfs4_lockowner *
6164 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
6166 unsigned int strhashval = ownerstr_hashval(owner);
6167 struct nfs4_stateowner *so;
6169 lockdep_assert_held(&clp->cl_lock);
6171 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
6173 if (so->so_is_open_owner)
6175 if (same_owner_str(so, owner))
6176 return lockowner(nfs4_get_stateowner(so));
6181 static struct nfs4_lockowner *
6182 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
6184 struct nfs4_lockowner *lo;
6186 spin_lock(&clp->cl_lock);
6187 lo = find_lockowner_str_locked(clp, owner);
6188 spin_unlock(&clp->cl_lock);
6192 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
6194 unhash_lockowner_locked(lockowner(sop));
6197 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
6199 struct nfs4_lockowner *lo = lockowner(sop);
6201 kmem_cache_free(lockowner_slab, lo);
6204 static const struct nfs4_stateowner_operations lockowner_ops = {
6205 .so_unhash = nfs4_unhash_lockowner,
6206 .so_free = nfs4_free_lockowner,
6210 * Alloc a lock owner structure.
6211 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
6214 * strhashval = ownerstr_hashval
6216 static struct nfs4_lockowner *
6217 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
6218 struct nfs4_ol_stateid *open_stp,
6219 struct nfsd4_lock *lock)
6221 struct nfs4_lockowner *lo, *ret;
6223 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
6226 INIT_LIST_HEAD(&lo->lo_blocked);
6227 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
6228 lo->lo_owner.so_is_open_owner = 0;
6229 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
6230 lo->lo_owner.so_ops = &lockowner_ops;
6231 spin_lock(&clp->cl_lock);
6232 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
6234 list_add(&lo->lo_owner.so_strhash,
6235 &clp->cl_ownerstr_hashtbl[strhashval]);
6238 nfs4_free_stateowner(&lo->lo_owner);
6240 spin_unlock(&clp->cl_lock);
6244 static struct nfs4_ol_stateid *
6245 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
6247 struct nfs4_ol_stateid *lst;
6248 struct nfs4_client *clp = lo->lo_owner.so_client;
6250 lockdep_assert_held(&clp->cl_lock);
6252 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
6253 if (lst->st_stid.sc_type != NFS4_LOCK_STID)
6255 if (lst->st_stid.sc_file == fp) {
6256 refcount_inc(&lst->st_stid.sc_count);
6263 static struct nfs4_ol_stateid *
6264 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
6265 struct nfs4_file *fp, struct inode *inode,
6266 struct nfs4_ol_stateid *open_stp)
6268 struct nfs4_client *clp = lo->lo_owner.so_client;
6269 struct nfs4_ol_stateid *retstp;
6271 mutex_init(&stp->st_mutex);
6272 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
6274 spin_lock(&clp->cl_lock);
6275 spin_lock(&fp->fi_lock);
6276 retstp = find_lock_stateid(lo, fp);
6280 refcount_inc(&stp->st_stid.sc_count);
6281 stp->st_stid.sc_type = NFS4_LOCK_STID;
6282 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
6284 stp->st_stid.sc_file = fp;
6285 stp->st_access_bmap = 0;
6286 stp->st_deny_bmap = open_stp->st_deny_bmap;
6287 stp->st_openstp = open_stp;
6288 list_add(&stp->st_locks, &open_stp->st_locks);
6289 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
6290 list_add(&stp->st_perfile, &fp->fi_stateids);
6292 spin_unlock(&fp->fi_lock);
6293 spin_unlock(&clp->cl_lock);
6295 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
6296 nfs4_put_stid(&retstp->st_stid);
6299 /* To keep mutex tracking happy */
6300 mutex_unlock(&stp->st_mutex);
6306 static struct nfs4_ol_stateid *
6307 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
6308 struct inode *inode, struct nfs4_ol_stateid *ost,
6311 struct nfs4_stid *ns = NULL;
6312 struct nfs4_ol_stateid *lst;
6313 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6314 struct nfs4_client *clp = oo->oo_owner.so_client;
6317 spin_lock(&clp->cl_lock);
6318 lst = find_lock_stateid(lo, fi);
6319 spin_unlock(&clp->cl_lock);
6321 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
6323 nfs4_put_stid(&lst->st_stid);
6325 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
6329 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
6330 if (lst == openlockstateid(ns))
6339 check_lock_length(u64 offset, u64 length)
6341 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
6342 (length > ~offset)));
6345 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
6347 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
6349 lockdep_assert_held(&fp->fi_lock);
6351 if (test_access(access, lock_stp))
6353 __nfs4_file_get_access(fp, access);
6354 set_access(access, lock_stp);
6358 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
6359 struct nfs4_ol_stateid *ost,
6360 struct nfsd4_lock *lock,
6361 struct nfs4_ol_stateid **plst, bool *new)
6364 struct nfs4_file *fi = ost->st_stid.sc_file;
6365 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6366 struct nfs4_client *cl = oo->oo_owner.so_client;
6367 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
6368 struct nfs4_lockowner *lo;
6369 struct nfs4_ol_stateid *lst;
6370 unsigned int strhashval;
6372 lo = find_lockowner_str(cl, &lock->lk_new_owner);
6374 strhashval = ownerstr_hashval(&lock->lk_new_owner);
6375 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
6377 return nfserr_jukebox;
6379 /* with an existing lockowner, seqids must be the same */
6380 status = nfserr_bad_seqid;
6381 if (!cstate->minorversion &&
6382 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
6386 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
6388 status = nfserr_jukebox;
6395 nfs4_put_stateowner(&lo->lo_owner);
6403 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6404 union nfsd4_op_u *u)
6406 struct nfsd4_lock *lock = &u->lock;
6407 struct nfs4_openowner *open_sop = NULL;
6408 struct nfs4_lockowner *lock_sop = NULL;
6409 struct nfs4_ol_stateid *lock_stp = NULL;
6410 struct nfs4_ol_stateid *open_stp = NULL;
6411 struct nfs4_file *fp;
6412 struct nfsd_file *nf = NULL;
6413 struct nfsd4_blocked_lock *nbl = NULL;
6414 struct file_lock *file_lock = NULL;
6415 struct file_lock *conflock = NULL;
6420 unsigned char fl_type;
6421 unsigned int fl_flags = FL_POSIX;
6422 struct net *net = SVC_NET(rqstp);
6423 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6425 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
6426 (long long) lock->lk_offset,
6427 (long long) lock->lk_length);
6429 if (check_lock_length(lock->lk_offset, lock->lk_length))
6430 return nfserr_inval;
6432 if ((status = fh_verify(rqstp, &cstate->current_fh,
6433 S_IFREG, NFSD_MAY_LOCK))) {
6434 dprintk("NFSD: nfsd4_lock: permission denied!\n");
6438 if (lock->lk_is_new) {
6439 if (nfsd4_has_session(cstate))
6440 /* See rfc 5661 18.10.3: given clientid is ignored: */
6441 memcpy(&lock->lk_new_clientid,
6442 &cstate->session->se_client->cl_clientid,
6443 sizeof(clientid_t));
6445 status = nfserr_stale_clientid;
6446 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
6449 /* validate and update open stateid and open seqid */
6450 status = nfs4_preprocess_confirmed_seqid_op(cstate,
6451 lock->lk_new_open_seqid,
6452 &lock->lk_new_open_stateid,
6456 mutex_unlock(&open_stp->st_mutex);
6457 open_sop = openowner(open_stp->st_stateowner);
6458 status = nfserr_bad_stateid;
6459 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
6460 &lock->lk_new_clientid))
6462 status = lookup_or_create_lock_state(cstate, open_stp, lock,
6465 status = nfs4_preprocess_seqid_op(cstate,
6466 lock->lk_old_lock_seqid,
6467 &lock->lk_old_lock_stateid,
6468 NFS4_LOCK_STID, &lock_stp, nn);
6472 lock_sop = lockowner(lock_stp->st_stateowner);
6474 lkflg = setlkflg(lock->lk_type);
6475 status = nfs4_check_openmode(lock_stp, lkflg);
6479 status = nfserr_grace;
6480 if (locks_in_grace(net) && !lock->lk_reclaim)
6482 status = nfserr_no_grace;
6483 if (!locks_in_grace(net) && lock->lk_reclaim)
6486 fp = lock_stp->st_stid.sc_file;
6487 switch (lock->lk_type) {
6489 if (nfsd4_has_session(cstate))
6490 fl_flags |= FL_SLEEP;
6493 spin_lock(&fp->fi_lock);
6494 nf = find_readable_file_locked(fp);
6496 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
6497 spin_unlock(&fp->fi_lock);
6500 case NFS4_WRITEW_LT:
6501 if (nfsd4_has_session(cstate))
6502 fl_flags |= FL_SLEEP;
6505 spin_lock(&fp->fi_lock);
6506 nf = find_writeable_file_locked(fp);
6508 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6509 spin_unlock(&fp->fi_lock);
6513 status = nfserr_inval;
6518 status = nfserr_openmode;
6522 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6524 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6525 status = nfserr_jukebox;
6529 file_lock = &nbl->nbl_lock;
6530 file_lock->fl_type = fl_type;
6531 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6532 file_lock->fl_pid = current->tgid;
6533 file_lock->fl_file = nf->nf_file;
6534 file_lock->fl_flags = fl_flags;
6535 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6536 file_lock->fl_start = lock->lk_offset;
6537 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6538 nfs4_transform_lock_offset(file_lock);
6540 conflock = locks_alloc_lock();
6542 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6543 status = nfserr_jukebox;
6547 if (fl_flags & FL_SLEEP) {
6548 nbl->nbl_time = jiffies;
6549 spin_lock(&nn->blocked_locks_lock);
6550 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6551 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6552 spin_unlock(&nn->blocked_locks_lock);
6555 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
6557 case 0: /* success! */
6558 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6560 if (lock->lk_reclaim)
6561 nn->somebody_reclaimed = true;
6563 case FILE_LOCK_DEFERRED:
6566 case -EAGAIN: /* conflock holds conflicting lock */
6567 status = nfserr_denied;
6568 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6569 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6572 status = nfserr_deadlock;
6575 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6576 status = nfserrno(err);
6581 /* dequeue it if we queued it before */
6582 if (fl_flags & FL_SLEEP) {
6583 spin_lock(&nn->blocked_locks_lock);
6584 list_del_init(&nbl->nbl_list);
6585 list_del_init(&nbl->nbl_lru);
6586 spin_unlock(&nn->blocked_locks_lock);
6588 free_blocked_lock(nbl);
6593 /* Bump seqid manually if the 4.0 replay owner is openowner */
6594 if (cstate->replay_owner &&
6595 cstate->replay_owner != &lock_sop->lo_owner &&
6596 seqid_mutating_err(ntohl(status)))
6597 lock_sop->lo_owner.so_seqid++;
6600 * If this is a new, never-before-used stateid, and we are
6601 * returning an error, then just go ahead and release it.
6604 release_lock_stateid(lock_stp);
6606 mutex_unlock(&lock_stp->st_mutex);
6608 nfs4_put_stid(&lock_stp->st_stid);
6611 nfs4_put_stid(&open_stp->st_stid);
6612 nfsd4_bump_seqid(cstate, status);
6614 locks_free_lock(conflock);
6619 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6620 * so we do a temporary open here just to get an open file to pass to
6621 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6624 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6626 struct nfsd_file *nf;
6627 __be32 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
6629 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
6639 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6640 union nfsd4_op_u *u)
6642 struct nfsd4_lockt *lockt = &u->lockt;
6643 struct file_lock *file_lock = NULL;
6644 struct nfs4_lockowner *lo = NULL;
6646 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6648 if (locks_in_grace(SVC_NET(rqstp)))
6649 return nfserr_grace;
6651 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6652 return nfserr_inval;
6654 if (!nfsd4_has_session(cstate)) {
6655 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
6660 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6663 file_lock = locks_alloc_lock();
6665 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6666 status = nfserr_jukebox;
6670 switch (lockt->lt_type) {
6673 file_lock->fl_type = F_RDLCK;
6676 case NFS4_WRITEW_LT:
6677 file_lock->fl_type = F_WRLCK;
6680 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6681 status = nfserr_inval;
6685 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6687 file_lock->fl_owner = (fl_owner_t)lo;
6688 file_lock->fl_pid = current->tgid;
6689 file_lock->fl_flags = FL_POSIX;
6691 file_lock->fl_start = lockt->lt_offset;
6692 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6694 nfs4_transform_lock_offset(file_lock);
6696 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6700 if (file_lock->fl_type != F_UNLCK) {
6701 status = nfserr_denied;
6702 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6706 nfs4_put_stateowner(&lo->lo_owner);
6708 locks_free_lock(file_lock);
6713 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6714 union nfsd4_op_u *u)
6716 struct nfsd4_locku *locku = &u->locku;
6717 struct nfs4_ol_stateid *stp;
6718 struct nfsd_file *nf = NULL;
6719 struct file_lock *file_lock = NULL;
6722 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6724 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6725 (long long) locku->lu_offset,
6726 (long long) locku->lu_length);
6728 if (check_lock_length(locku->lu_offset, locku->lu_length))
6729 return nfserr_inval;
6731 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6732 &locku->lu_stateid, NFS4_LOCK_STID,
6736 nf = find_any_file(stp->st_stid.sc_file);
6738 status = nfserr_lock_range;
6741 file_lock = locks_alloc_lock();
6743 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6744 status = nfserr_jukebox;
6748 file_lock->fl_type = F_UNLCK;
6749 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6750 file_lock->fl_pid = current->tgid;
6751 file_lock->fl_file = nf->nf_file;
6752 file_lock->fl_flags = FL_POSIX;
6753 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6754 file_lock->fl_start = locku->lu_offset;
6756 file_lock->fl_end = last_byte_offset(locku->lu_offset,
6758 nfs4_transform_lock_offset(file_lock);
6760 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
6762 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6765 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6769 mutex_unlock(&stp->st_mutex);
6770 nfs4_put_stid(&stp->st_stid);
6772 nfsd4_bump_seqid(cstate, status);
6774 locks_free_lock(file_lock);
6778 status = nfserrno(err);
6784 * true: locks held by lockowner
6785 * false: no locks held by lockowner
6788 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6790 struct file_lock *fl;
6792 struct nfsd_file *nf = find_any_file(fp);
6793 struct inode *inode;
6794 struct file_lock_context *flctx;
6797 /* Any valid lock stateid should have some sort of access */
6802 inode = locks_inode(nf->nf_file);
6803 flctx = inode->i_flctx;
6805 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6806 spin_lock(&flctx->flc_lock);
6807 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6808 if (fl->fl_owner == (fl_owner_t)lowner) {
6813 spin_unlock(&flctx->flc_lock);
6820 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6821 struct nfsd4_compound_state *cstate,
6822 union nfsd4_op_u *u)
6824 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6825 clientid_t *clid = &rlockowner->rl_clientid;
6826 struct nfs4_stateowner *sop;
6827 struct nfs4_lockowner *lo = NULL;
6828 struct nfs4_ol_stateid *stp;
6829 struct xdr_netobj *owner = &rlockowner->rl_owner;
6830 unsigned int hashval = ownerstr_hashval(owner);
6832 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6833 struct nfs4_client *clp;
6834 LIST_HEAD (reaplist);
6836 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6837 clid->cl_boot, clid->cl_id);
6839 status = lookup_clientid(clid, cstate, nn);
6844 /* Find the matching lock stateowner */
6845 spin_lock(&clp->cl_lock);
6846 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6849 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6852 /* see if there are still any locks associated with it */
6853 lo = lockowner(sop);
6854 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6855 if (check_for_locks(stp->st_stid.sc_file, lo)) {
6856 status = nfserr_locks_held;
6857 spin_unlock(&clp->cl_lock);
6862 nfs4_get_stateowner(sop);
6866 spin_unlock(&clp->cl_lock);
6870 unhash_lockowner_locked(lo);
6871 while (!list_empty(&lo->lo_owner.so_stateids)) {
6872 stp = list_first_entry(&lo->lo_owner.so_stateids,
6873 struct nfs4_ol_stateid,
6875 WARN_ON(!unhash_lock_stateid(stp));
6876 put_ol_stateid_locked(stp, &reaplist);
6878 spin_unlock(&clp->cl_lock);
6879 free_ol_stateid_reaplist(&reaplist);
6880 remove_blocked_locks(lo);
6881 nfs4_put_stateowner(&lo->lo_owner);
6886 static inline struct nfs4_client_reclaim *
6889 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6893 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
6895 struct nfs4_client_reclaim *crp;
6897 crp = nfsd4_find_reclaim_client(name, nn);
6898 return (crp && crp->cr_clp);
6902 * failure => all reset bets are off, nfserr_no_grace...
6904 * The caller is responsible for freeing name.data if NULL is returned (it
6905 * will be freed in nfs4_remove_reclaim_record in the normal case).
6907 struct nfs4_client_reclaim *
6908 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
6909 struct nfsd_net *nn)
6911 unsigned int strhashval;
6912 struct nfs4_client_reclaim *crp;
6914 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", name.len, name.data);
6915 crp = alloc_reclaim();
6917 strhashval = clientstr_hashval(name);
6918 INIT_LIST_HEAD(&crp->cr_strhash);
6919 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6920 crp->cr_name.data = name.data;
6921 crp->cr_name.len = name.len;
6922 crp->cr_princhash.data = princhash.data;
6923 crp->cr_princhash.len = princhash.len;
6925 nn->reclaim_str_hashtbl_size++;
6931 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6933 list_del(&crp->cr_strhash);
6934 kfree(crp->cr_name.data);
6935 kfree(crp->cr_princhash.data);
6937 nn->reclaim_str_hashtbl_size--;
6941 nfs4_release_reclaim(struct nfsd_net *nn)
6943 struct nfs4_client_reclaim *crp = NULL;
6946 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6947 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6948 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6949 struct nfs4_client_reclaim, cr_strhash);
6950 nfs4_remove_reclaim_record(crp, nn);
6953 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6957 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6958 struct nfs4_client_reclaim *
6959 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
6961 unsigned int strhashval;
6962 struct nfs4_client_reclaim *crp = NULL;
6964 dprintk("NFSD: nfs4_find_reclaim_client for name %.*s\n", name.len, name.data);
6966 strhashval = clientstr_hashval(name);
6967 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6968 if (compare_blob(&crp->cr_name, &name) == 0) {
6976 * Called from OPEN. Look for clientid in reclaim list.
6979 nfs4_check_open_reclaim(clientid_t *clid,
6980 struct nfsd4_compound_state *cstate,
6981 struct nfsd_net *nn)
6985 /* find clientid in conf_id_hashtbl */
6986 status = lookup_clientid(clid, cstate, nn);
6988 return nfserr_reclaim_bad;
6990 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6991 return nfserr_no_grace;
6993 if (nfsd4_client_record_check(cstate->clp))
6994 return nfserr_reclaim_bad;
6999 #ifdef CONFIG_NFSD_FAULT_INJECTION
7001 put_client(struct nfs4_client *clp)
7003 atomic_dec(&clp->cl_rpc_users);
7006 static struct nfs4_client *
7007 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
7009 struct nfs4_client *clp;
7010 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7013 if (!nfsd_netns_ready(nn))
7016 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7017 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
7024 nfsd_inject_print_clients(void)
7026 struct nfs4_client *clp;
7028 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7030 char buf[INET6_ADDRSTRLEN];
7032 if (!nfsd_netns_ready(nn))
7035 spin_lock(&nn->client_lock);
7036 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7037 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
7038 pr_info("NFS Client: %s\n", buf);
7041 spin_unlock(&nn->client_lock);
7047 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
7050 struct nfs4_client *clp;
7051 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7054 if (!nfsd_netns_ready(nn))
7057 spin_lock(&nn->client_lock);
7058 clp = nfsd_find_client(addr, addr_size);
7060 if (mark_client_expired_locked(clp) == nfs_ok)
7065 spin_unlock(&nn->client_lock);
7074 nfsd_inject_forget_clients(u64 max)
7077 struct nfs4_client *clp, *next;
7078 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7080 LIST_HEAD(reaplist);
7082 if (!nfsd_netns_ready(nn))
7085 spin_lock(&nn->client_lock);
7086 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7087 if (mark_client_expired_locked(clp) == nfs_ok) {
7088 list_add(&clp->cl_lru, &reaplist);
7089 if (max != 0 && ++count >= max)
7093 spin_unlock(&nn->client_lock);
7095 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
7101 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
7104 char buf[INET6_ADDRSTRLEN];
7105 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
7106 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
7110 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
7111 struct list_head *collect)
7113 struct nfs4_client *clp = lst->st_stid.sc_client;
7114 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7120 lockdep_assert_held(&nn->client_lock);
7121 atomic_inc(&clp->cl_rpc_users);
7122 list_add(&lst->st_locks, collect);
7125 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
7126 struct list_head *collect,
7127 bool (*func)(struct nfs4_ol_stateid *))
7129 struct nfs4_openowner *oop;
7130 struct nfs4_ol_stateid *stp, *st_next;
7131 struct nfs4_ol_stateid *lst, *lst_next;
7134 spin_lock(&clp->cl_lock);
7135 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
7136 list_for_each_entry_safe(stp, st_next,
7137 &oop->oo_owner.so_stateids, st_perstateowner) {
7138 list_for_each_entry_safe(lst, lst_next,
7139 &stp->st_locks, st_locks) {
7142 nfsd_inject_add_lock_to_list(lst,
7147 * Despite the fact that these functions deal
7148 * with 64-bit integers for "count", we must
7149 * ensure that it doesn't blow up the
7150 * clp->cl_rpc_users. Throw a warning if we
7151 * start to approach INT_MAX here.
7153 WARN_ON_ONCE(count == (INT_MAX / 2));
7160 spin_unlock(&clp->cl_lock);
7166 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
7169 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
7173 nfsd_print_client_locks(struct nfs4_client *clp)
7175 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
7176 nfsd_print_count(clp, count, "locked files");
7181 nfsd_inject_print_locks(void)
7183 struct nfs4_client *clp;
7185 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7188 if (!nfsd_netns_ready(nn))
7191 spin_lock(&nn->client_lock);
7192 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7193 count += nfsd_print_client_locks(clp);
7194 spin_unlock(&nn->client_lock);
7200 nfsd_reap_locks(struct list_head *reaplist)
7202 struct nfs4_client *clp;
7203 struct nfs4_ol_stateid *stp, *next;
7205 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
7206 list_del_init(&stp->st_locks);
7207 clp = stp->st_stid.sc_client;
7208 nfs4_put_stid(&stp->st_stid);
7214 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
7216 unsigned int count = 0;
7217 struct nfs4_client *clp;
7218 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7220 LIST_HEAD(reaplist);
7222 if (!nfsd_netns_ready(nn))
7225 spin_lock(&nn->client_lock);
7226 clp = nfsd_find_client(addr, addr_size);
7228 count = nfsd_collect_client_locks(clp, &reaplist, 0);
7229 spin_unlock(&nn->client_lock);
7230 nfsd_reap_locks(&reaplist);
7235 nfsd_inject_forget_locks(u64 max)
7238 struct nfs4_client *clp;
7239 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7241 LIST_HEAD(reaplist);
7243 if (!nfsd_netns_ready(nn))
7246 spin_lock(&nn->client_lock);
7247 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7248 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
7249 if (max != 0 && count >= max)
7252 spin_unlock(&nn->client_lock);
7253 nfsd_reap_locks(&reaplist);
7258 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
7259 struct list_head *collect,
7260 void (*func)(struct nfs4_openowner *))
7262 struct nfs4_openowner *oop, *next;
7263 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7267 lockdep_assert_held(&nn->client_lock);
7269 spin_lock(&clp->cl_lock);
7270 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
7274 atomic_inc(&clp->cl_rpc_users);
7275 list_add(&oop->oo_perclient, collect);
7280 * Despite the fact that these functions deal with
7281 * 64-bit integers for "count", we must ensure that
7282 * it doesn't blow up the clp->cl_rpc_users. Throw a
7283 * warning if we start to approach INT_MAX here.
7285 WARN_ON_ONCE(count == (INT_MAX / 2));
7289 spin_unlock(&clp->cl_lock);
7295 nfsd_print_client_openowners(struct nfs4_client *clp)
7297 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
7299 nfsd_print_count(clp, count, "openowners");
7304 nfsd_collect_client_openowners(struct nfs4_client *clp,
7305 struct list_head *collect, u64 max)
7307 return nfsd_foreach_client_openowner(clp, max, collect,
7308 unhash_openowner_locked);
7312 nfsd_inject_print_openowners(void)
7314 struct nfs4_client *clp;
7316 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7319 if (!nfsd_netns_ready(nn))
7322 spin_lock(&nn->client_lock);
7323 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7324 count += nfsd_print_client_openowners(clp);
7325 spin_unlock(&nn->client_lock);
7331 nfsd_reap_openowners(struct list_head *reaplist)
7333 struct nfs4_client *clp;
7334 struct nfs4_openowner *oop, *next;
7336 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
7337 list_del_init(&oop->oo_perclient);
7338 clp = oop->oo_owner.so_client;
7339 release_openowner(oop);
7345 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
7348 unsigned int count = 0;
7349 struct nfs4_client *clp;
7350 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7352 LIST_HEAD(reaplist);
7354 if (!nfsd_netns_ready(nn))
7357 spin_lock(&nn->client_lock);
7358 clp = nfsd_find_client(addr, addr_size);
7360 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
7361 spin_unlock(&nn->client_lock);
7362 nfsd_reap_openowners(&reaplist);
7367 nfsd_inject_forget_openowners(u64 max)
7370 struct nfs4_client *clp;
7371 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7373 LIST_HEAD(reaplist);
7375 if (!nfsd_netns_ready(nn))
7378 spin_lock(&nn->client_lock);
7379 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7380 count += nfsd_collect_client_openowners(clp, &reaplist,
7382 if (max != 0 && count >= max)
7385 spin_unlock(&nn->client_lock);
7386 nfsd_reap_openowners(&reaplist);
7390 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
7391 struct list_head *victims)
7393 struct nfs4_delegation *dp, *next;
7394 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7398 lockdep_assert_held(&nn->client_lock);
7400 spin_lock(&state_lock);
7401 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
7404 * It's not safe to mess with delegations that have a
7405 * non-zero dl_time. They might have already been broken
7406 * and could be processed by the laundromat outside of
7407 * the state_lock. Just leave them be.
7409 if (dp->dl_time != 0)
7412 atomic_inc(&clp->cl_rpc_users);
7413 WARN_ON(!unhash_delegation_locked(dp));
7414 list_add(&dp->dl_recall_lru, victims);
7418 * Despite the fact that these functions deal with
7419 * 64-bit integers for "count", we must ensure that
7420 * it doesn't blow up the clp->cl_rpc_users. Throw a
7421 * warning if we start to approach INT_MAX here.
7423 WARN_ON_ONCE(count == (INT_MAX / 2));
7427 spin_unlock(&state_lock);
7432 nfsd_print_client_delegations(struct nfs4_client *clp)
7434 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
7436 nfsd_print_count(clp, count, "delegations");
7441 nfsd_inject_print_delegations(void)
7443 struct nfs4_client *clp;
7445 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7448 if (!nfsd_netns_ready(nn))
7451 spin_lock(&nn->client_lock);
7452 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7453 count += nfsd_print_client_delegations(clp);
7454 spin_unlock(&nn->client_lock);
7460 nfsd_forget_delegations(struct list_head *reaplist)
7462 struct nfs4_client *clp;
7463 struct nfs4_delegation *dp, *next;
7465 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7466 list_del_init(&dp->dl_recall_lru);
7467 clp = dp->dl_stid.sc_client;
7468 revoke_delegation(dp);
7474 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
7478 struct nfs4_client *clp;
7479 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7481 LIST_HEAD(reaplist);
7483 if (!nfsd_netns_ready(nn))
7486 spin_lock(&nn->client_lock);
7487 clp = nfsd_find_client(addr, addr_size);
7489 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7490 spin_unlock(&nn->client_lock);
7492 nfsd_forget_delegations(&reaplist);
7497 nfsd_inject_forget_delegations(u64 max)
7500 struct nfs4_client *clp;
7501 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7503 LIST_HEAD(reaplist);
7505 if (!nfsd_netns_ready(nn))
7508 spin_lock(&nn->client_lock);
7509 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7510 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7511 if (max != 0 && count >= max)
7514 spin_unlock(&nn->client_lock);
7515 nfsd_forget_delegations(&reaplist);
7520 nfsd_recall_delegations(struct list_head *reaplist)
7522 struct nfs4_client *clp;
7523 struct nfs4_delegation *dp, *next;
7525 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7526 list_del_init(&dp->dl_recall_lru);
7527 clp = dp->dl_stid.sc_client;
7529 * We skipped all entries that had a zero dl_time before,
7530 * so we can now reset the dl_time back to 0. If a delegation
7531 * break comes in now, then it won't make any difference since
7532 * we're recalling it either way.
7534 spin_lock(&state_lock);
7536 spin_unlock(&state_lock);
7537 nfsd_break_one_deleg(dp);
7543 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
7547 struct nfs4_client *clp;
7548 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7550 LIST_HEAD(reaplist);
7552 if (!nfsd_netns_ready(nn))
7555 spin_lock(&nn->client_lock);
7556 clp = nfsd_find_client(addr, addr_size);
7558 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7559 spin_unlock(&nn->client_lock);
7561 nfsd_recall_delegations(&reaplist);
7566 nfsd_inject_recall_delegations(u64 max)
7569 struct nfs4_client *clp, *next;
7570 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7572 LIST_HEAD(reaplist);
7574 if (!nfsd_netns_ready(nn))
7577 spin_lock(&nn->client_lock);
7578 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7579 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7580 if (max != 0 && ++count >= max)
7583 spin_unlock(&nn->client_lock);
7584 nfsd_recall_delegations(&reaplist);
7587 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7590 * Since the lifetime of a delegation isn't limited to that of an open, a
7591 * client may quite reasonably hang on to a delegation as long as it has
7592 * the inode cached. This becomes an obvious problem the first time a
7593 * client's inode cache approaches the size of the server's total memory.
7595 * For now we avoid this problem by imposing a hard limit on the number
7596 * of delegations, which varies according to the server's memory size.
7599 set_max_delegations(void)
7602 * Allow at most 4 delegations per megabyte of RAM. Quick
7603 * estimates suggest that in the worst case (where every delegation
7604 * is for a different inode), a delegation could take about 1.5K,
7605 * giving a worst case usage of about 6% of memory.
7607 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7610 static int nfs4_state_create_net(struct net *net)
7612 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7615 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7616 sizeof(struct list_head),
7618 if (!nn->conf_id_hashtbl)
7620 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7621 sizeof(struct list_head),
7623 if (!nn->unconf_id_hashtbl)
7625 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
7626 sizeof(struct list_head),
7628 if (!nn->sessionid_hashtbl)
7631 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7632 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7633 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7635 for (i = 0; i < SESSION_HASH_SIZE; i++)
7636 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7637 nn->conf_name_tree = RB_ROOT;
7638 nn->unconf_name_tree = RB_ROOT;
7639 nn->boot_time = get_seconds();
7640 nn->grace_ended = false;
7641 nn->nfsd4_manager.block_opens = true;
7642 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7643 INIT_LIST_HEAD(&nn->client_lru);
7644 INIT_LIST_HEAD(&nn->close_lru);
7645 INIT_LIST_HEAD(&nn->del_recall_lru);
7646 spin_lock_init(&nn->client_lock);
7647 spin_lock_init(&nn->s2s_cp_lock);
7648 idr_init(&nn->s2s_cp_stateids);
7650 spin_lock_init(&nn->blocked_locks_lock);
7651 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7653 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7659 kfree(nn->unconf_id_hashtbl);
7661 kfree(nn->conf_id_hashtbl);
7667 nfs4_state_destroy_net(struct net *net)
7670 struct nfs4_client *clp = NULL;
7671 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7673 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7674 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7675 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7676 destroy_client(clp);
7680 WARN_ON(!list_empty(&nn->blocked_locks_lru));
7682 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7683 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7684 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7685 destroy_client(clp);
7689 kfree(nn->sessionid_hashtbl);
7690 kfree(nn->unconf_id_hashtbl);
7691 kfree(nn->conf_id_hashtbl);
7696 nfs4_state_start_net(struct net *net)
7698 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7701 ret = nfs4_state_create_net(net);
7704 locks_start_grace(net, &nn->nfsd4_manager);
7705 nfsd4_client_tracking_init(net);
7706 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
7708 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %x)\n",
7709 nn->nfsd4_grace, net->ns.inum);
7710 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7714 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
7716 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
7717 nfsd4_end_grace(nn);
7721 /* initialization to perform when the nfsd service is started: */
7724 nfs4_state_start(void)
7728 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7729 if (laundry_wq == NULL) {
7733 ret = nfsd4_create_callback_queue();
7735 goto out_free_laundry;
7737 set_max_delegations();
7741 destroy_workqueue(laundry_wq);
7747 nfs4_state_shutdown_net(struct net *net)
7749 struct nfs4_delegation *dp = NULL;
7750 struct list_head *pos, *next, reaplist;
7751 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7753 cancel_delayed_work_sync(&nn->laundromat_work);
7754 locks_end_grace(&nn->nfsd4_manager);
7756 INIT_LIST_HEAD(&reaplist);
7757 spin_lock(&state_lock);
7758 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7759 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7760 WARN_ON(!unhash_delegation_locked(dp));
7761 list_add(&dp->dl_recall_lru, &reaplist);
7763 spin_unlock(&state_lock);
7764 list_for_each_safe(pos, next, &reaplist) {
7765 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7766 list_del_init(&dp->dl_recall_lru);
7767 destroy_unhashed_deleg(dp);
7770 nfsd4_client_tracking_exit(net);
7771 nfs4_state_destroy_net(net);
7775 nfs4_state_shutdown(void)
7777 destroy_workqueue(laundry_wq);
7778 nfsd4_destroy_callback_queue();
7782 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7784 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
7785 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7789 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7791 if (cstate->minorversion) {
7792 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7793 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7798 clear_current_stateid(struct nfsd4_compound_state *cstate)
7800 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7804 * functions to set current state id
7807 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7808 union nfsd4_op_u *u)
7810 put_stateid(cstate, &u->open_downgrade.od_stateid);
7814 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7815 union nfsd4_op_u *u)
7817 put_stateid(cstate, &u->open.op_stateid);
7821 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7822 union nfsd4_op_u *u)
7824 put_stateid(cstate, &u->close.cl_stateid);
7828 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7829 union nfsd4_op_u *u)
7831 put_stateid(cstate, &u->lock.lk_resp_stateid);
7835 * functions to consume current state id
7839 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
7840 union nfsd4_op_u *u)
7842 get_stateid(cstate, &u->open_downgrade.od_stateid);
7846 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
7847 union nfsd4_op_u *u)
7849 get_stateid(cstate, &u->delegreturn.dr_stateid);
7853 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
7854 union nfsd4_op_u *u)
7856 get_stateid(cstate, &u->free_stateid.fr_stateid);
7860 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
7861 union nfsd4_op_u *u)
7863 get_stateid(cstate, &u->setattr.sa_stateid);
7867 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
7868 union nfsd4_op_u *u)
7870 get_stateid(cstate, &u->close.cl_stateid);
7874 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
7875 union nfsd4_op_u *u)
7877 get_stateid(cstate, &u->locku.lu_stateid);
7881 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
7882 union nfsd4_op_u *u)
7884 get_stateid(cstate, &u->read.rd_stateid);
7888 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
7889 union nfsd4_op_u *u)
7891 get_stateid(cstate, &u->write.wr_stateid);