2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
48 #include "current_stateid.h"
53 #define NFSDDBG_FACILITY NFSDDBG_PROC
55 #define all_ones {{~0,~0},~0}
56 static const stateid_t one_stateid = {
58 .si_opaque = all_ones,
60 static const stateid_t zero_stateid = {
63 static const stateid_t currentstateid = {
66 static const stateid_t close_stateid = {
67 .si_generation = 0xffffffffU,
70 static u64 current_sessionid = 1;
72 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
73 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
74 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
75 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
77 /* forward declarations */
78 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
79 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
84 * Currently used for the del_recall_lru and file hash table. In an
85 * effort to decrease the scope of the client_mutex, this spinlock may
86 * eventually cover more:
88 static DEFINE_SPINLOCK(state_lock);
90 enum nfsd4_st_mutex_lock_subclass {
91 OPEN_STATEID_MUTEX = 0,
92 LOCK_STATEID_MUTEX = 1,
96 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
97 * the refcount on the open stateid to drop.
99 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
101 static struct kmem_cache *client_slab;
102 static struct kmem_cache *openowner_slab;
103 static struct kmem_cache *lockowner_slab;
104 static struct kmem_cache *file_slab;
105 static struct kmem_cache *stateid_slab;
106 static struct kmem_cache *deleg_slab;
107 static struct kmem_cache *odstate_slab;
109 static void free_session(struct nfsd4_session *);
111 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
112 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
114 static bool is_session_dead(struct nfsd4_session *ses)
116 return ses->se_flags & NFS4_SESSION_DEAD;
119 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
121 if (atomic_read(&ses->se_ref) > ref_held_by_me)
122 return nfserr_jukebox;
123 ses->se_flags |= NFS4_SESSION_DEAD;
127 static bool is_client_expired(struct nfs4_client *clp)
129 return clp->cl_time == 0;
132 static __be32 get_client_locked(struct nfs4_client *clp)
134 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
136 lockdep_assert_held(&nn->client_lock);
138 if (is_client_expired(clp))
139 return nfserr_expired;
140 atomic_inc(&clp->cl_refcount);
144 /* must be called under the client_lock */
146 renew_client_locked(struct nfs4_client *clp)
148 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
150 if (is_client_expired(clp)) {
152 printk("%s: client (clientid %08x/%08x) already expired\n",
154 clp->cl_clientid.cl_boot,
155 clp->cl_clientid.cl_id);
159 dprintk("renewing client (clientid %08x/%08x)\n",
160 clp->cl_clientid.cl_boot,
161 clp->cl_clientid.cl_id);
162 list_move_tail(&clp->cl_lru, &nn->client_lru);
163 clp->cl_time = get_seconds();
166 static void put_client_renew_locked(struct nfs4_client *clp)
168 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
170 lockdep_assert_held(&nn->client_lock);
172 if (!atomic_dec_and_test(&clp->cl_refcount))
174 if (!is_client_expired(clp))
175 renew_client_locked(clp);
178 static void put_client_renew(struct nfs4_client *clp)
180 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
182 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
184 if (!is_client_expired(clp))
185 renew_client_locked(clp);
186 spin_unlock(&nn->client_lock);
189 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
193 if (is_session_dead(ses))
194 return nfserr_badsession;
195 status = get_client_locked(ses->se_client);
198 atomic_inc(&ses->se_ref);
202 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
204 struct nfs4_client *clp = ses->se_client;
205 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
207 lockdep_assert_held(&nn->client_lock);
209 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
211 put_client_renew_locked(clp);
214 static void nfsd4_put_session(struct nfsd4_session *ses)
216 struct nfs4_client *clp = ses->se_client;
217 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
219 spin_lock(&nn->client_lock);
220 nfsd4_put_session_locked(ses);
221 spin_unlock(&nn->client_lock);
224 static struct nfsd4_blocked_lock *
225 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
228 struct nfsd4_blocked_lock *cur, *found = NULL;
230 spin_lock(&nn->blocked_locks_lock);
231 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
232 if (fh_match(fh, &cur->nbl_fh)) {
233 list_del_init(&cur->nbl_list);
234 list_del_init(&cur->nbl_lru);
239 spin_unlock(&nn->blocked_locks_lock);
241 posix_unblock_lock(&found->nbl_lock);
245 static struct nfsd4_blocked_lock *
246 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
249 struct nfsd4_blocked_lock *nbl;
251 nbl = find_blocked_lock(lo, fh, nn);
253 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
255 fh_copy_shallow(&nbl->nbl_fh, fh);
256 locks_init_lock(&nbl->nbl_lock);
257 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
258 &nfsd4_cb_notify_lock_ops,
259 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
266 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
268 locks_release_private(&nbl->nbl_lock);
273 remove_blocked_locks(struct nfs4_lockowner *lo)
275 struct nfs4_client *clp = lo->lo_owner.so_client;
276 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
277 struct nfsd4_blocked_lock *nbl;
280 /* Dequeue all blocked locks */
281 spin_lock(&nn->blocked_locks_lock);
282 while (!list_empty(&lo->lo_blocked)) {
283 nbl = list_first_entry(&lo->lo_blocked,
284 struct nfsd4_blocked_lock,
286 list_del_init(&nbl->nbl_list);
287 list_move(&nbl->nbl_lru, &reaplist);
289 spin_unlock(&nn->blocked_locks_lock);
292 while (!list_empty(&reaplist)) {
293 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
295 list_del_init(&nbl->nbl_lru);
296 posix_unblock_lock(&nbl->nbl_lock);
297 free_blocked_lock(nbl);
302 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
305 * Since this is just an optimization, we don't try very hard if it
306 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
307 * just quit trying on anything else.
309 switch (task->tk_status) {
311 rpc_delay(task, 1 * HZ);
319 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
321 struct nfsd4_blocked_lock *nbl = container_of(cb,
322 struct nfsd4_blocked_lock, nbl_cb);
324 free_blocked_lock(nbl);
327 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
328 .done = nfsd4_cb_notify_lock_done,
329 .release = nfsd4_cb_notify_lock_release,
332 static inline struct nfs4_stateowner *
333 nfs4_get_stateowner(struct nfs4_stateowner *sop)
335 atomic_inc(&sop->so_count);
340 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
342 return (sop->so_owner.len == owner->len) &&
343 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
346 static struct nfs4_openowner *
347 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
348 struct nfs4_client *clp)
350 struct nfs4_stateowner *so;
352 lockdep_assert_held(&clp->cl_lock);
354 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
356 if (!so->so_is_open_owner)
358 if (same_owner_str(so, &open->op_owner))
359 return openowner(nfs4_get_stateowner(so));
364 static struct nfs4_openowner *
365 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
366 struct nfs4_client *clp)
368 struct nfs4_openowner *oo;
370 spin_lock(&clp->cl_lock);
371 oo = find_openstateowner_str_locked(hashval, open, clp);
372 spin_unlock(&clp->cl_lock);
377 opaque_hashval(const void *ptr, int nbytes)
379 unsigned char *cptr = (unsigned char *) ptr;
389 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
391 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
393 kmem_cache_free(file_slab, fp);
397 put_nfs4_file(struct nfs4_file *fi)
399 might_lock(&state_lock);
401 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
402 hlist_del_rcu(&fi->fi_hash);
403 spin_unlock(&state_lock);
404 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
405 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
406 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
411 __nfs4_get_fd(struct nfs4_file *f, int oflag)
413 if (f->fi_fds[oflag])
414 return get_file(f->fi_fds[oflag]);
419 find_writeable_file_locked(struct nfs4_file *f)
423 lockdep_assert_held(&f->fi_lock);
425 ret = __nfs4_get_fd(f, O_WRONLY);
427 ret = __nfs4_get_fd(f, O_RDWR);
432 find_writeable_file(struct nfs4_file *f)
436 spin_lock(&f->fi_lock);
437 ret = find_writeable_file_locked(f);
438 spin_unlock(&f->fi_lock);
443 static struct file *find_readable_file_locked(struct nfs4_file *f)
447 lockdep_assert_held(&f->fi_lock);
449 ret = __nfs4_get_fd(f, O_RDONLY);
451 ret = __nfs4_get_fd(f, O_RDWR);
456 find_readable_file(struct nfs4_file *f)
460 spin_lock(&f->fi_lock);
461 ret = find_readable_file_locked(f);
462 spin_unlock(&f->fi_lock);
468 find_any_file(struct nfs4_file *f)
472 spin_lock(&f->fi_lock);
473 ret = __nfs4_get_fd(f, O_RDWR);
475 ret = __nfs4_get_fd(f, O_WRONLY);
477 ret = __nfs4_get_fd(f, O_RDONLY);
479 spin_unlock(&f->fi_lock);
483 static atomic_long_t num_delegations;
484 unsigned long max_delegations;
487 * Open owner state (share locks)
490 /* hash tables for lock and open owners */
491 #define OWNER_HASH_BITS 8
492 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
493 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
495 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
499 ret = opaque_hashval(ownername->data, ownername->len);
500 return ret & OWNER_HASH_MASK;
503 /* hash table for nfs4_file */
504 #define FILE_HASH_BITS 8
505 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
507 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
509 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
512 static unsigned int file_hashval(struct knfsd_fh *fh)
514 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
517 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
520 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
522 lockdep_assert_held(&fp->fi_lock);
524 if (access & NFS4_SHARE_ACCESS_WRITE)
525 atomic_inc(&fp->fi_access[O_WRONLY]);
526 if (access & NFS4_SHARE_ACCESS_READ)
527 atomic_inc(&fp->fi_access[O_RDONLY]);
531 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
533 lockdep_assert_held(&fp->fi_lock);
535 /* Does this access mode make sense? */
536 if (access & ~NFS4_SHARE_ACCESS_BOTH)
539 /* Does it conflict with a deny mode already set? */
540 if ((access & fp->fi_share_deny) != 0)
541 return nfserr_share_denied;
543 __nfs4_file_get_access(fp, access);
547 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
549 /* Common case is that there is no deny mode. */
551 /* Does this deny mode make sense? */
552 if (deny & ~NFS4_SHARE_DENY_BOTH)
555 if ((deny & NFS4_SHARE_DENY_READ) &&
556 atomic_read(&fp->fi_access[O_RDONLY]))
557 return nfserr_share_denied;
559 if ((deny & NFS4_SHARE_DENY_WRITE) &&
560 atomic_read(&fp->fi_access[O_WRONLY]))
561 return nfserr_share_denied;
566 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
568 might_lock(&fp->fi_lock);
570 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
571 struct file *f1 = NULL;
572 struct file *f2 = NULL;
574 swap(f1, fp->fi_fds[oflag]);
575 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
576 swap(f2, fp->fi_fds[O_RDWR]);
577 spin_unlock(&fp->fi_lock);
585 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
587 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
589 if (access & NFS4_SHARE_ACCESS_WRITE)
590 __nfs4_file_put_access(fp, O_WRONLY);
591 if (access & NFS4_SHARE_ACCESS_READ)
592 __nfs4_file_put_access(fp, O_RDONLY);
596 * Allocate a new open/delegation state counter. This is needed for
597 * pNFS for proper return on close semantics.
599 * Note that we only allocate it for pNFS-enabled exports, otherwise
600 * all pointers to struct nfs4_clnt_odstate are always NULL.
602 static struct nfs4_clnt_odstate *
603 alloc_clnt_odstate(struct nfs4_client *clp)
605 struct nfs4_clnt_odstate *co;
607 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
610 refcount_set(&co->co_odcount, 1);
616 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
618 struct nfs4_file *fp = co->co_file;
620 lockdep_assert_held(&fp->fi_lock);
621 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
625 get_clnt_odstate(struct nfs4_clnt_odstate *co)
628 refcount_inc(&co->co_odcount);
632 put_clnt_odstate(struct nfs4_clnt_odstate *co)
634 struct nfs4_file *fp;
640 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
641 list_del(&co->co_perfile);
642 spin_unlock(&fp->fi_lock);
644 nfsd4_return_all_file_layouts(co->co_client, fp);
645 kmem_cache_free(odstate_slab, co);
649 static struct nfs4_clnt_odstate *
650 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
652 struct nfs4_clnt_odstate *co;
653 struct nfs4_client *cl;
660 spin_lock(&fp->fi_lock);
661 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
662 if (co->co_client == cl) {
663 get_clnt_odstate(co);
669 hash_clnt_odstate_locked(new);
671 spin_unlock(&fp->fi_lock);
675 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
676 void (*sc_free)(struct nfs4_stid *))
678 struct nfs4_stid *stid;
681 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
685 idr_preload(GFP_KERNEL);
686 spin_lock(&cl->cl_lock);
687 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
688 spin_unlock(&cl->cl_lock);
693 stid->sc_free = sc_free;
694 stid->sc_client = cl;
695 stid->sc_stateid.si_opaque.so_id = new_id;
696 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
697 /* Will be incremented before return to client: */
698 refcount_set(&stid->sc_count, 1);
699 spin_lock_init(&stid->sc_lock);
702 * It shouldn't be a problem to reuse an opaque stateid value.
703 * I don't think it is for 4.1. But with 4.0 I worry that, for
704 * example, a stray write retransmission could be accepted by
705 * the server when it should have been rejected. Therefore,
706 * adopt a trick from the sctp code to attempt to maximize the
707 * amount of time until an id is reused, by ensuring they always
708 * "increase" (mod INT_MAX):
712 kmem_cache_free(slab, stid);
716 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
718 struct nfs4_stid *stid;
720 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
724 return openlockstateid(stid);
727 static void nfs4_free_deleg(struct nfs4_stid *stid)
729 kmem_cache_free(deleg_slab, stid);
730 atomic_long_dec(&num_delegations);
734 * When we recall a delegation, we should be careful not to hand it
735 * out again straight away.
736 * To ensure this we keep a pair of bloom filters ('new' and 'old')
737 * in which the filehandles of recalled delegations are "stored".
738 * If a filehandle appear in either filter, a delegation is blocked.
739 * When a delegation is recalled, the filehandle is stored in the "new"
741 * Every 30 seconds we swap the filters and clear the "new" one,
742 * unless both are empty of course.
744 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
745 * low 3 bytes as hash-table indices.
747 * 'blocked_delegations_lock', which is always taken in block_delegations(),
748 * is used to manage concurrent access. Testing does not need the lock
749 * except when swapping the two filters.
751 static DEFINE_SPINLOCK(blocked_delegations_lock);
752 static struct bloom_pair {
753 int entries, old_entries;
755 int new; /* index into 'set' */
756 DECLARE_BITMAP(set[2], 256);
757 } blocked_delegations;
759 static int delegation_blocked(struct knfsd_fh *fh)
762 struct bloom_pair *bd = &blocked_delegations;
764 if (bd->entries == 0)
766 if (seconds_since_boot() - bd->swap_time > 30) {
767 spin_lock(&blocked_delegations_lock);
768 if (seconds_since_boot() - bd->swap_time > 30) {
769 bd->entries -= bd->old_entries;
770 bd->old_entries = bd->entries;
771 memset(bd->set[bd->new], 0,
774 bd->swap_time = seconds_since_boot();
776 spin_unlock(&blocked_delegations_lock);
778 hash = jhash(&fh->fh_base, fh->fh_size, 0);
779 if (test_bit(hash&255, bd->set[0]) &&
780 test_bit((hash>>8)&255, bd->set[0]) &&
781 test_bit((hash>>16)&255, bd->set[0]))
784 if (test_bit(hash&255, bd->set[1]) &&
785 test_bit((hash>>8)&255, bd->set[1]) &&
786 test_bit((hash>>16)&255, bd->set[1]))
792 static void block_delegations(struct knfsd_fh *fh)
795 struct bloom_pair *bd = &blocked_delegations;
797 hash = jhash(&fh->fh_base, fh->fh_size, 0);
799 spin_lock(&blocked_delegations_lock);
800 __set_bit(hash&255, bd->set[bd->new]);
801 __set_bit((hash>>8)&255, bd->set[bd->new]);
802 __set_bit((hash>>16)&255, bd->set[bd->new]);
803 if (bd->entries == 0)
804 bd->swap_time = seconds_since_boot();
806 spin_unlock(&blocked_delegations_lock);
809 static struct nfs4_delegation *
810 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
811 struct svc_fh *current_fh,
812 struct nfs4_clnt_odstate *odstate)
814 struct nfs4_delegation *dp;
817 dprintk("NFSD alloc_init_deleg\n");
818 n = atomic_long_inc_return(&num_delegations);
819 if (n < 0 || n > max_delegations)
821 if (delegation_blocked(¤t_fh->fh_handle))
823 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
828 * delegation seqid's are never incremented. The 4.1 special
829 * meaning of seqid 0 isn't meaningful, really, but let's avoid
830 * 0 anyway just for consistency and use 1:
832 dp->dl_stid.sc_stateid.si_generation = 1;
833 INIT_LIST_HEAD(&dp->dl_perfile);
834 INIT_LIST_HEAD(&dp->dl_perclnt);
835 INIT_LIST_HEAD(&dp->dl_recall_lru);
836 dp->dl_clnt_odstate = odstate;
837 get_clnt_odstate(odstate);
838 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
840 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
841 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
843 dp->dl_stid.sc_file = fp;
846 atomic_long_dec(&num_delegations);
851 nfs4_put_stid(struct nfs4_stid *s)
853 struct nfs4_file *fp = s->sc_file;
854 struct nfs4_client *clp = s->sc_client;
856 might_lock(&clp->cl_lock);
858 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
859 wake_up_all(&close_wq);
862 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
863 spin_unlock(&clp->cl_lock);
870 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
872 stateid_t *src = &stid->sc_stateid;
874 spin_lock(&stid->sc_lock);
875 if (unlikely(++src->si_generation == 0))
876 src->si_generation = 1;
877 memcpy(dst, src, sizeof(*dst));
878 spin_unlock(&stid->sc_lock);
881 static void put_deleg_file(struct nfs4_file *fp)
883 struct file *filp = NULL;
885 spin_lock(&fp->fi_lock);
886 if (--fp->fi_delegees == 0)
887 swap(filp, fp->fi_deleg_file);
888 spin_unlock(&fp->fi_lock);
894 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
896 struct nfs4_file *fp = dp->dl_stid.sc_file;
897 struct file *filp = fp->fi_deleg_file;
899 WARN_ON_ONCE(!fp->fi_delegees);
901 vfs_setlease(filp, F_UNLCK, NULL, (void **)&dp);
905 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
907 put_clnt_odstate(dp->dl_clnt_odstate);
908 nfs4_unlock_deleg_lease(dp);
909 nfs4_put_stid(&dp->dl_stid);
912 void nfs4_unhash_stid(struct nfs4_stid *s)
918 * nfs4_delegation_exists - Discover if this delegation already exists
919 * @clp: a pointer to the nfs4_client we're granting a delegation to
920 * @fp: a pointer to the nfs4_file we're granting a delegation on
923 * On success: true iff an existing delegation is found
927 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
929 struct nfs4_delegation *searchdp = NULL;
930 struct nfs4_client *searchclp = NULL;
932 lockdep_assert_held(&state_lock);
933 lockdep_assert_held(&fp->fi_lock);
935 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
936 searchclp = searchdp->dl_stid.sc_client;
937 if (clp == searchclp) {
945 * hash_delegation_locked - Add a delegation to the appropriate lists
946 * @dp: a pointer to the nfs4_delegation we are adding.
947 * @fp: a pointer to the nfs4_file we're granting a delegation on
950 * On success: NULL if the delegation was successfully hashed.
952 * On error: -EAGAIN if one was previously granted to this
953 * nfs4_client for this nfs4_file. Delegation is not hashed.
958 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
960 struct nfs4_client *clp = dp->dl_stid.sc_client;
962 lockdep_assert_held(&state_lock);
963 lockdep_assert_held(&fp->fi_lock);
965 if (nfs4_delegation_exists(clp, fp))
967 refcount_inc(&dp->dl_stid.sc_count);
968 dp->dl_stid.sc_type = NFS4_DELEG_STID;
969 list_add(&dp->dl_perfile, &fp->fi_delegations);
970 list_add(&dp->dl_perclnt, &clp->cl_delegations);
975 unhash_delegation_locked(struct nfs4_delegation *dp)
977 struct nfs4_file *fp = dp->dl_stid.sc_file;
979 lockdep_assert_held(&state_lock);
981 if (list_empty(&dp->dl_perfile))
984 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
985 /* Ensure that deleg break won't try to requeue it */
987 spin_lock(&fp->fi_lock);
988 list_del_init(&dp->dl_perclnt);
989 list_del_init(&dp->dl_recall_lru);
990 list_del_init(&dp->dl_perfile);
991 spin_unlock(&fp->fi_lock);
995 static void destroy_delegation(struct nfs4_delegation *dp)
999 spin_lock(&state_lock);
1000 unhashed = unhash_delegation_locked(dp);
1001 spin_unlock(&state_lock);
1003 destroy_unhashed_deleg(dp);
1006 static void revoke_delegation(struct nfs4_delegation *dp)
1008 struct nfs4_client *clp = dp->dl_stid.sc_client;
1010 WARN_ON(!list_empty(&dp->dl_recall_lru));
1012 if (clp->cl_minorversion) {
1013 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1014 refcount_inc(&dp->dl_stid.sc_count);
1015 spin_lock(&clp->cl_lock);
1016 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1017 spin_unlock(&clp->cl_lock);
1019 destroy_unhashed_deleg(dp);
1026 static unsigned int clientid_hashval(u32 id)
1028 return id & CLIENT_HASH_MASK;
1031 static unsigned int clientstr_hashval(const char *name)
1033 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
1037 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1038 * st_{access,deny}_bmap field of the stateid, in order to track not
1039 * only what share bits are currently in force, but also what
1040 * combinations of share bits previous opens have used. This allows us
1041 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1042 * return an error if the client attempt to downgrade to a combination
1043 * of share bits not explicable by closing some of its previous opens.
1045 * XXX: This enforcement is actually incomplete, since we don't keep
1046 * track of access/deny bit combinations; so, e.g., we allow:
1048 * OPEN allow read, deny write
1049 * OPEN allow both, deny none
1050 * DOWNGRADE allow read, deny none
1052 * which we should reject.
1055 bmap_to_share_mode(unsigned long bmap) {
1057 unsigned int access = 0;
1059 for (i = 1; i < 4; i++) {
1060 if (test_bit(i, &bmap))
1066 /* set share access for a given stateid */
1068 set_access(u32 access, struct nfs4_ol_stateid *stp)
1070 unsigned char mask = 1 << access;
1072 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1073 stp->st_access_bmap |= mask;
1076 /* clear share access for a given stateid */
1078 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1080 unsigned char mask = 1 << access;
1082 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1083 stp->st_access_bmap &= ~mask;
1086 /* test whether a given stateid has access */
1088 test_access(u32 access, struct nfs4_ol_stateid *stp)
1090 unsigned char mask = 1 << access;
1092 return (bool)(stp->st_access_bmap & mask);
1095 /* set share deny for a given stateid */
1097 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1099 unsigned char mask = 1 << deny;
1101 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1102 stp->st_deny_bmap |= mask;
1105 /* clear share deny for a given stateid */
1107 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1109 unsigned char mask = 1 << deny;
1111 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1112 stp->st_deny_bmap &= ~mask;
1115 /* test whether a given stateid is denying specific access */
1117 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1119 unsigned char mask = 1 << deny;
1121 return (bool)(stp->st_deny_bmap & mask);
1124 static int nfs4_access_to_omode(u32 access)
1126 switch (access & NFS4_SHARE_ACCESS_BOTH) {
1127 case NFS4_SHARE_ACCESS_READ:
1129 case NFS4_SHARE_ACCESS_WRITE:
1131 case NFS4_SHARE_ACCESS_BOTH:
1139 * A stateid that had a deny mode associated with it is being released
1140 * or downgraded. Recalculate the deny mode on the file.
1143 recalculate_deny_mode(struct nfs4_file *fp)
1145 struct nfs4_ol_stateid *stp;
1147 spin_lock(&fp->fi_lock);
1148 fp->fi_share_deny = 0;
1149 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1150 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1151 spin_unlock(&fp->fi_lock);
1155 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1158 bool change = false;
1160 for (i = 1; i < 4; i++) {
1161 if ((i & deny) != i) {
1167 /* Recalculate per-file deny mode if there was a change */
1169 recalculate_deny_mode(stp->st_stid.sc_file);
1172 /* release all access and file references for a given stateid */
1174 release_all_access(struct nfs4_ol_stateid *stp)
1177 struct nfs4_file *fp = stp->st_stid.sc_file;
1179 if (fp && stp->st_deny_bmap != 0)
1180 recalculate_deny_mode(fp);
1182 for (i = 1; i < 4; i++) {
1183 if (test_access(i, stp))
1184 nfs4_file_put_access(stp->st_stid.sc_file, i);
1185 clear_access(i, stp);
1189 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1191 kfree(sop->so_owner.data);
1192 sop->so_ops->so_free(sop);
1195 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1197 struct nfs4_client *clp = sop->so_client;
1199 might_lock(&clp->cl_lock);
1201 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1203 sop->so_ops->so_unhash(sop);
1204 spin_unlock(&clp->cl_lock);
1205 nfs4_free_stateowner(sop);
1208 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1210 struct nfs4_file *fp = stp->st_stid.sc_file;
1212 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1214 if (list_empty(&stp->st_perfile))
1217 spin_lock(&fp->fi_lock);
1218 list_del_init(&stp->st_perfile);
1219 spin_unlock(&fp->fi_lock);
1220 list_del(&stp->st_perstateowner);
1224 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1226 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1228 put_clnt_odstate(stp->st_clnt_odstate);
1229 release_all_access(stp);
1230 if (stp->st_stateowner)
1231 nfs4_put_stateowner(stp->st_stateowner);
1232 kmem_cache_free(stateid_slab, stid);
1235 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1237 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1238 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1241 file = find_any_file(stp->st_stid.sc_file);
1243 filp_close(file, (fl_owner_t)lo);
1244 nfs4_free_ol_stateid(stid);
1248 * Put the persistent reference to an already unhashed generic stateid, while
1249 * holding the cl_lock. If it's the last reference, then put it onto the
1250 * reaplist for later destruction.
1252 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1253 struct list_head *reaplist)
1255 struct nfs4_stid *s = &stp->st_stid;
1256 struct nfs4_client *clp = s->sc_client;
1258 lockdep_assert_held(&clp->cl_lock);
1260 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1262 if (!refcount_dec_and_test(&s->sc_count)) {
1263 wake_up_all(&close_wq);
1267 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1268 list_add(&stp->st_locks, reaplist);
1271 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1273 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1275 list_del_init(&stp->st_locks);
1276 nfs4_unhash_stid(&stp->st_stid);
1277 return unhash_ol_stateid(stp);
1280 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1282 struct nfs4_client *clp = stp->st_stid.sc_client;
1285 spin_lock(&clp->cl_lock);
1286 unhashed = unhash_lock_stateid(stp);
1287 spin_unlock(&clp->cl_lock);
1289 nfs4_put_stid(&stp->st_stid);
1292 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1294 struct nfs4_client *clp = lo->lo_owner.so_client;
1296 lockdep_assert_held(&clp->cl_lock);
1298 list_del_init(&lo->lo_owner.so_strhash);
1302 * Free a list of generic stateids that were collected earlier after being
1306 free_ol_stateid_reaplist(struct list_head *reaplist)
1308 struct nfs4_ol_stateid *stp;
1309 struct nfs4_file *fp;
1313 while (!list_empty(reaplist)) {
1314 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1316 list_del(&stp->st_locks);
1317 fp = stp->st_stid.sc_file;
1318 stp->st_stid.sc_free(&stp->st_stid);
1324 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1325 struct list_head *reaplist)
1327 struct nfs4_ol_stateid *stp;
1329 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1331 while (!list_empty(&open_stp->st_locks)) {
1332 stp = list_entry(open_stp->st_locks.next,
1333 struct nfs4_ol_stateid, st_locks);
1334 WARN_ON(!unhash_lock_stateid(stp));
1335 put_ol_stateid_locked(stp, reaplist);
1339 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1340 struct list_head *reaplist)
1344 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1346 unhashed = unhash_ol_stateid(stp);
1347 release_open_stateid_locks(stp, reaplist);
1351 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1353 LIST_HEAD(reaplist);
1355 spin_lock(&stp->st_stid.sc_client->cl_lock);
1356 if (unhash_open_stateid(stp, &reaplist))
1357 put_ol_stateid_locked(stp, &reaplist);
1358 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1359 free_ol_stateid_reaplist(&reaplist);
1362 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1364 struct nfs4_client *clp = oo->oo_owner.so_client;
1366 lockdep_assert_held(&clp->cl_lock);
1368 list_del_init(&oo->oo_owner.so_strhash);
1369 list_del_init(&oo->oo_perclient);
1372 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1374 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1376 struct nfs4_ol_stateid *s;
1378 spin_lock(&nn->client_lock);
1379 s = oo->oo_last_closed_stid;
1381 list_del_init(&oo->oo_close_lru);
1382 oo->oo_last_closed_stid = NULL;
1384 spin_unlock(&nn->client_lock);
1386 nfs4_put_stid(&s->st_stid);
1389 static void release_openowner(struct nfs4_openowner *oo)
1391 struct nfs4_ol_stateid *stp;
1392 struct nfs4_client *clp = oo->oo_owner.so_client;
1393 struct list_head reaplist;
1395 INIT_LIST_HEAD(&reaplist);
1397 spin_lock(&clp->cl_lock);
1398 unhash_openowner_locked(oo);
1399 while (!list_empty(&oo->oo_owner.so_stateids)) {
1400 stp = list_first_entry(&oo->oo_owner.so_stateids,
1401 struct nfs4_ol_stateid, st_perstateowner);
1402 if (unhash_open_stateid(stp, &reaplist))
1403 put_ol_stateid_locked(stp, &reaplist);
1405 spin_unlock(&clp->cl_lock);
1406 free_ol_stateid_reaplist(&reaplist);
1407 release_last_closed_stateid(oo);
1408 nfs4_put_stateowner(&oo->oo_owner);
1412 hash_sessionid(struct nfs4_sessionid *sessionid)
1414 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1416 return sid->sequence % SESSION_HASH_SIZE;
1419 #ifdef CONFIG_SUNRPC_DEBUG
1421 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1423 u32 *ptr = (u32 *)(&sessionid->data[0]);
1424 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1428 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1434 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1435 * won't be used for replay.
1437 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1439 struct nfs4_stateowner *so = cstate->replay_owner;
1441 if (nfserr == nfserr_replay_me)
1444 if (!seqid_mutating_err(ntohl(nfserr))) {
1445 nfsd4_cstate_clear_replay(cstate);
1450 if (so->so_is_open_owner)
1451 release_last_closed_stateid(openowner(so));
1457 gen_sessionid(struct nfsd4_session *ses)
1459 struct nfs4_client *clp = ses->se_client;
1460 struct nfsd4_sessionid *sid;
1462 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1463 sid->clientid = clp->cl_clientid;
1464 sid->sequence = current_sessionid++;
1469 * The protocol defines ca_maxresponssize_cached to include the size of
1470 * the rpc header, but all we need to cache is the data starting after
1471 * the end of the initial SEQUENCE operation--the rest we regenerate
1472 * each time. Therefore we can advertise a ca_maxresponssize_cached
1473 * value that is the number of bytes in our cache plus a few additional
1474 * bytes. In order to stay on the safe side, and not promise more than
1475 * we can cache, those additional bytes must be the minimum possible: 24
1476 * bytes of rpc header (xid through accept state, with AUTH_NULL
1477 * verifier), 12 for the compound header (with zero-length tag), and 44
1478 * for the SEQUENCE op response:
1480 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1483 free_session_slots(struct nfsd4_session *ses)
1487 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1488 free_svc_cred(&ses->se_slots[i]->sl_cred);
1489 kfree(ses->se_slots[i]);
1494 * We don't actually need to cache the rpc and session headers, so we
1495 * can allocate a little less for each slot:
1497 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1501 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1504 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1505 return size + sizeof(struct nfsd4_slot);
1509 * XXX: If we run out of reserved DRC memory we could (up to a point)
1510 * re-negotiate active sessions and reduce their slot usage to make
1511 * room for new connections. For now we just fail the create session.
1513 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1515 u32 slotsize = slot_bytes(ca);
1516 u32 num = ca->maxreqs;
1519 spin_lock(&nfsd_drc_lock);
1520 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1521 nfsd_drc_max_mem - nfsd_drc_mem_used);
1523 * Never use more than a third of the remaining memory,
1524 * unless it's the only way to give this client a slot:
1526 avail = clamp_t(int, avail, slotsize, avail/3);
1527 num = min_t(int, num, avail / slotsize);
1528 nfsd_drc_mem_used += num * slotsize;
1529 spin_unlock(&nfsd_drc_lock);
1534 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1536 int slotsize = slot_bytes(ca);
1538 spin_lock(&nfsd_drc_lock);
1539 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1540 spin_unlock(&nfsd_drc_lock);
1543 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1544 struct nfsd4_channel_attrs *battrs)
1546 int numslots = fattrs->maxreqs;
1547 int slotsize = slot_bytes(fattrs);
1548 struct nfsd4_session *new;
1551 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1552 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1553 mem = numslots * sizeof(struct nfsd4_slot *);
1555 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1558 /* allocate each struct nfsd4_slot and data cache in one piece */
1559 for (i = 0; i < numslots; i++) {
1560 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1561 if (!new->se_slots[i])
1565 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1566 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1571 kfree(new->se_slots[i]);
1576 static void free_conn(struct nfsd4_conn *c)
1578 svc_xprt_put(c->cn_xprt);
1582 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1584 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1585 struct nfs4_client *clp = c->cn_session->se_client;
1587 spin_lock(&clp->cl_lock);
1588 if (!list_empty(&c->cn_persession)) {
1589 list_del(&c->cn_persession);
1592 nfsd4_probe_callback(clp);
1593 spin_unlock(&clp->cl_lock);
1596 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1598 struct nfsd4_conn *conn;
1600 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1603 svc_xprt_get(rqstp->rq_xprt);
1604 conn->cn_xprt = rqstp->rq_xprt;
1605 conn->cn_flags = flags;
1606 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1610 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1612 conn->cn_session = ses;
1613 list_add(&conn->cn_persession, &ses->se_conns);
1616 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1618 struct nfs4_client *clp = ses->se_client;
1620 spin_lock(&clp->cl_lock);
1621 __nfsd4_hash_conn(conn, ses);
1622 spin_unlock(&clp->cl_lock);
1625 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1627 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1628 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1631 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1635 nfsd4_hash_conn(conn, ses);
1636 ret = nfsd4_register_conn(conn);
1638 /* oops; xprt is already down: */
1639 nfsd4_conn_lost(&conn->cn_xpt_user);
1640 /* We may have gained or lost a callback channel: */
1641 nfsd4_probe_callback_sync(ses->se_client);
1644 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1646 u32 dir = NFS4_CDFC4_FORE;
1648 if (cses->flags & SESSION4_BACK_CHAN)
1649 dir |= NFS4_CDFC4_BACK;
1650 return alloc_conn(rqstp, dir);
1653 /* must be called under client_lock */
1654 static void nfsd4_del_conns(struct nfsd4_session *s)
1656 struct nfs4_client *clp = s->se_client;
1657 struct nfsd4_conn *c;
1659 spin_lock(&clp->cl_lock);
1660 while (!list_empty(&s->se_conns)) {
1661 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1662 list_del_init(&c->cn_persession);
1663 spin_unlock(&clp->cl_lock);
1665 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1668 spin_lock(&clp->cl_lock);
1670 spin_unlock(&clp->cl_lock);
1673 static void __free_session(struct nfsd4_session *ses)
1675 free_session_slots(ses);
1679 static void free_session(struct nfsd4_session *ses)
1681 nfsd4_del_conns(ses);
1682 nfsd4_put_drc_mem(&ses->se_fchannel);
1683 __free_session(ses);
1686 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1689 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1691 new->se_client = clp;
1694 INIT_LIST_HEAD(&new->se_conns);
1696 new->se_cb_seq_nr = 1;
1697 new->se_flags = cses->flags;
1698 new->se_cb_prog = cses->callback_prog;
1699 new->se_cb_sec = cses->cb_sec;
1700 atomic_set(&new->se_ref, 0);
1701 idx = hash_sessionid(&new->se_sessionid);
1702 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1703 spin_lock(&clp->cl_lock);
1704 list_add(&new->se_perclnt, &clp->cl_sessions);
1705 spin_unlock(&clp->cl_lock);
1708 struct sockaddr *sa = svc_addr(rqstp);
1710 * This is a little silly; with sessions there's no real
1711 * use for the callback address. Use the peer address
1712 * as a reasonable default for now, but consider fixing
1713 * the rpc client not to require an address in the
1716 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1717 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1721 /* caller must hold client_lock */
1722 static struct nfsd4_session *
1723 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1725 struct nfsd4_session *elem;
1727 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1729 lockdep_assert_held(&nn->client_lock);
1731 dump_sessionid(__func__, sessionid);
1732 idx = hash_sessionid(sessionid);
1733 /* Search in the appropriate list */
1734 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1735 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1736 NFS4_MAX_SESSIONID_LEN)) {
1741 dprintk("%s: session not found\n", __func__);
1745 static struct nfsd4_session *
1746 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1749 struct nfsd4_session *session;
1750 __be32 status = nfserr_badsession;
1752 session = __find_in_sessionid_hashtbl(sessionid, net);
1755 status = nfsd4_get_session_locked(session);
1763 /* caller must hold client_lock */
1765 unhash_session(struct nfsd4_session *ses)
1767 struct nfs4_client *clp = ses->se_client;
1768 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1770 lockdep_assert_held(&nn->client_lock);
1772 list_del(&ses->se_hash);
1773 spin_lock(&ses->se_client->cl_lock);
1774 list_del(&ses->se_perclnt);
1775 spin_unlock(&ses->se_client->cl_lock);
1778 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1780 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1783 * We're assuming the clid was not given out from a boot
1784 * precisely 2^32 (about 136 years) before this one. That seems
1785 * a safe assumption:
1787 if (clid->cl_boot == (u32)nn->boot_time)
1789 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1790 clid->cl_boot, clid->cl_id, nn->boot_time);
1795 * XXX Should we use a slab cache ?
1796 * This type of memory management is somewhat inefficient, but we use it
1797 * anyway since SETCLIENTID is not a common operation.
1799 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1801 struct nfs4_client *clp;
1804 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
1807 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1808 if (clp->cl_name.data == NULL)
1810 clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1811 OWNER_HASH_SIZE, GFP_KERNEL);
1812 if (!clp->cl_ownerstr_hashtbl)
1813 goto err_no_hashtbl;
1814 for (i = 0; i < OWNER_HASH_SIZE; i++)
1815 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1816 clp->cl_name.len = name.len;
1817 INIT_LIST_HEAD(&clp->cl_sessions);
1818 idr_init(&clp->cl_stateids);
1819 atomic_set(&clp->cl_refcount, 0);
1820 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1821 INIT_LIST_HEAD(&clp->cl_idhash);
1822 INIT_LIST_HEAD(&clp->cl_openowners);
1823 INIT_LIST_HEAD(&clp->cl_delegations);
1824 INIT_LIST_HEAD(&clp->cl_lru);
1825 INIT_LIST_HEAD(&clp->cl_revoked);
1826 #ifdef CONFIG_NFSD_PNFS
1827 INIT_LIST_HEAD(&clp->cl_lo_states);
1829 spin_lock_init(&clp->cl_lock);
1830 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1833 kfree(clp->cl_name.data);
1835 kmem_cache_free(client_slab, clp);
1840 free_client(struct nfs4_client *clp)
1842 while (!list_empty(&clp->cl_sessions)) {
1843 struct nfsd4_session *ses;
1844 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1846 list_del(&ses->se_perclnt);
1847 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1850 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1851 free_svc_cred(&clp->cl_cred);
1852 kfree(clp->cl_ownerstr_hashtbl);
1853 kfree(clp->cl_name.data);
1854 idr_destroy(&clp->cl_stateids);
1855 kmem_cache_free(client_slab, clp);
1858 /* must be called under the client_lock */
1860 unhash_client_locked(struct nfs4_client *clp)
1862 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1863 struct nfsd4_session *ses;
1865 lockdep_assert_held(&nn->client_lock);
1867 /* Mark the client as expired! */
1869 /* Make it invisible */
1870 if (!list_empty(&clp->cl_idhash)) {
1871 list_del_init(&clp->cl_idhash);
1872 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1873 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1875 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1877 list_del_init(&clp->cl_lru);
1878 spin_lock(&clp->cl_lock);
1879 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1880 list_del_init(&ses->se_hash);
1881 spin_unlock(&clp->cl_lock);
1885 unhash_client(struct nfs4_client *clp)
1887 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1889 spin_lock(&nn->client_lock);
1890 unhash_client_locked(clp);
1891 spin_unlock(&nn->client_lock);
1894 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1896 if (atomic_read(&clp->cl_refcount))
1897 return nfserr_jukebox;
1898 unhash_client_locked(clp);
1903 __destroy_client(struct nfs4_client *clp)
1906 struct nfs4_openowner *oo;
1907 struct nfs4_delegation *dp;
1908 struct list_head reaplist;
1910 INIT_LIST_HEAD(&reaplist);
1911 spin_lock(&state_lock);
1912 while (!list_empty(&clp->cl_delegations)) {
1913 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1914 WARN_ON(!unhash_delegation_locked(dp));
1915 list_add(&dp->dl_recall_lru, &reaplist);
1917 spin_unlock(&state_lock);
1918 while (!list_empty(&reaplist)) {
1919 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1920 list_del_init(&dp->dl_recall_lru);
1921 destroy_unhashed_deleg(dp);
1923 while (!list_empty(&clp->cl_revoked)) {
1924 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1925 list_del_init(&dp->dl_recall_lru);
1926 nfs4_put_stid(&dp->dl_stid);
1928 while (!list_empty(&clp->cl_openowners)) {
1929 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1930 nfs4_get_stateowner(&oo->oo_owner);
1931 release_openowner(oo);
1933 for (i = 0; i < OWNER_HASH_SIZE; i++) {
1934 struct nfs4_stateowner *so, *tmp;
1936 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
1938 /* Should be no openowners at this point */
1939 WARN_ON_ONCE(so->so_is_open_owner);
1940 remove_blocked_locks(lockowner(so));
1943 nfsd4_return_all_client_layouts(clp);
1944 nfsd4_shutdown_callback(clp);
1945 if (clp->cl_cb_conn.cb_xprt)
1946 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1951 destroy_client(struct nfs4_client *clp)
1954 __destroy_client(clp);
1957 static void expire_client(struct nfs4_client *clp)
1960 nfsd4_client_record_remove(clp);
1961 __destroy_client(clp);
1964 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1966 memcpy(target->cl_verifier.data, source->data,
1967 sizeof(target->cl_verifier.data));
1970 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1972 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1973 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1976 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1978 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
1979 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
1981 if ((source->cr_principal && ! target->cr_principal) ||
1982 (source->cr_raw_principal && ! target->cr_raw_principal))
1985 target->cr_flavor = source->cr_flavor;
1986 target->cr_uid = source->cr_uid;
1987 target->cr_gid = source->cr_gid;
1988 target->cr_group_info = source->cr_group_info;
1989 get_group_info(target->cr_group_info);
1990 target->cr_gss_mech = source->cr_gss_mech;
1991 if (source->cr_gss_mech)
1992 gss_mech_get(source->cr_gss_mech);
1997 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1999 if (o1->len < o2->len)
2001 if (o1->len > o2->len)
2003 return memcmp(o1->data, o2->data, o1->len);
2006 static int same_name(const char *n1, const char *n2)
2008 return 0 == memcmp(n1, n2, HEXDIR_LEN);
2012 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2014 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2018 same_clid(clientid_t *cl1, clientid_t *cl2)
2020 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2023 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2027 if (g1->ngroups != g2->ngroups)
2029 for (i=0; i<g1->ngroups; i++)
2030 if (!gid_eq(g1->gid[i], g2->gid[i]))
2036 * RFC 3530 language requires clid_inuse be returned when the
2037 * "principal" associated with a requests differs from that previously
2038 * used. We use uid, gid's, and gss principal string as our best
2039 * approximation. We also don't want to allow non-gss use of a client
2040 * established using gss: in theory cr_principal should catch that
2041 * change, but in practice cr_principal can be null even in the gss case
2042 * since gssd doesn't always pass down a principal string.
2044 static bool is_gss_cred(struct svc_cred *cr)
2046 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2047 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2052 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2054 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2055 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2056 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2057 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2059 if (cr1->cr_principal == cr2->cr_principal)
2061 if (!cr1->cr_principal || !cr2->cr_principal)
2063 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2066 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2068 struct svc_cred *cr = &rqstp->rq_cred;
2071 if (!cr->cr_gss_mech)
2073 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2074 return service == RPC_GSS_SVC_INTEGRITY ||
2075 service == RPC_GSS_SVC_PRIVACY;
2078 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2080 struct svc_cred *cr = &rqstp->rq_cred;
2082 if (!cl->cl_mach_cred)
2084 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2086 if (!svc_rqst_integrity_protected(rqstp))
2088 if (cl->cl_cred.cr_raw_principal)
2089 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2090 cr->cr_raw_principal);
2091 if (!cr->cr_principal)
2093 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2096 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2101 * This is opaque to client, so no need to byte-swap. Use
2102 * __force to keep sparse happy
2104 verf[0] = (__force __be32)get_seconds();
2105 verf[1] = (__force __be32)nn->clverifier_counter++;
2106 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2109 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2111 clp->cl_clientid.cl_boot = nn->boot_time;
2112 clp->cl_clientid.cl_id = nn->clientid_counter++;
2113 gen_confirm(clp, nn);
2116 static struct nfs4_stid *
2117 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2119 struct nfs4_stid *ret;
2121 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2122 if (!ret || !ret->sc_type)
2127 static struct nfs4_stid *
2128 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2130 struct nfs4_stid *s;
2132 spin_lock(&cl->cl_lock);
2133 s = find_stateid_locked(cl, t);
2135 if (typemask & s->sc_type)
2136 refcount_inc(&s->sc_count);
2140 spin_unlock(&cl->cl_lock);
2144 static struct nfs4_client *create_client(struct xdr_netobj name,
2145 struct svc_rqst *rqstp, nfs4_verifier *verf)
2147 struct nfs4_client *clp;
2148 struct sockaddr *sa = svc_addr(rqstp);
2150 struct net *net = SVC_NET(rqstp);
2152 clp = alloc_client(name);
2156 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2161 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2162 clp->cl_time = get_seconds();
2163 clear_bit(0, &clp->cl_cb_slot_busy);
2164 copy_verf(clp, verf);
2165 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2166 clp->cl_cb_session = NULL;
2172 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2174 struct rb_node **new = &(root->rb_node), *parent = NULL;
2175 struct nfs4_client *clp;
2178 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2181 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2182 new = &((*new)->rb_left);
2184 new = &((*new)->rb_right);
2187 rb_link_node(&new_clp->cl_namenode, parent, new);
2188 rb_insert_color(&new_clp->cl_namenode, root);
2191 static struct nfs4_client *
2192 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2195 struct rb_node *node = root->rb_node;
2196 struct nfs4_client *clp;
2199 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2200 cmp = compare_blob(&clp->cl_name, name);
2202 node = node->rb_left;
2204 node = node->rb_right;
2212 add_to_unconfirmed(struct nfs4_client *clp)
2214 unsigned int idhashval;
2215 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2217 lockdep_assert_held(&nn->client_lock);
2219 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2220 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2221 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2222 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2223 renew_client_locked(clp);
2227 move_to_confirmed(struct nfs4_client *clp)
2229 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2230 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2232 lockdep_assert_held(&nn->client_lock);
2234 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2235 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2236 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2237 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2238 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2239 renew_client_locked(clp);
2242 static struct nfs4_client *
2243 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2245 struct nfs4_client *clp;
2246 unsigned int idhashval = clientid_hashval(clid->cl_id);
2248 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2249 if (same_clid(&clp->cl_clientid, clid)) {
2250 if ((bool)clp->cl_minorversion != sessions)
2252 renew_client_locked(clp);
2259 static struct nfs4_client *
2260 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2262 struct list_head *tbl = nn->conf_id_hashtbl;
2264 lockdep_assert_held(&nn->client_lock);
2265 return find_client_in_id_table(tbl, clid, sessions);
2268 static struct nfs4_client *
2269 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2271 struct list_head *tbl = nn->unconf_id_hashtbl;
2273 lockdep_assert_held(&nn->client_lock);
2274 return find_client_in_id_table(tbl, clid, sessions);
2277 static bool clp_used_exchangeid(struct nfs4_client *clp)
2279 return clp->cl_exchange_flags != 0;
2282 static struct nfs4_client *
2283 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2285 lockdep_assert_held(&nn->client_lock);
2286 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2289 static struct nfs4_client *
2290 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2292 lockdep_assert_held(&nn->client_lock);
2293 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2297 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2299 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2300 struct sockaddr *sa = svc_addr(rqstp);
2301 u32 scopeid = rpc_get_scope_id(sa);
2302 unsigned short expected_family;
2304 /* Currently, we only support tcp and tcp6 for the callback channel */
2305 if (se->se_callback_netid_len == 3 &&
2306 !memcmp(se->se_callback_netid_val, "tcp", 3))
2307 expected_family = AF_INET;
2308 else if (se->se_callback_netid_len == 4 &&
2309 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2310 expected_family = AF_INET6;
2314 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2315 se->se_callback_addr_len,
2316 (struct sockaddr *)&conn->cb_addr,
2317 sizeof(conn->cb_addr));
2319 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2322 if (conn->cb_addr.ss_family == AF_INET6)
2323 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2325 conn->cb_prog = se->se_callback_prog;
2326 conn->cb_ident = se->se_callback_ident;
2327 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2330 conn->cb_addr.ss_family = AF_UNSPEC;
2331 conn->cb_addrlen = 0;
2332 dprintk("NFSD: this client (clientid %08x/%08x) "
2333 "will not receive delegations\n",
2334 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2340 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2343 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2345 struct xdr_buf *buf = resp->xdr.buf;
2346 struct nfsd4_slot *slot = resp->cstate.slot;
2349 dprintk("--> %s slot %p\n", __func__, slot);
2351 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2352 slot->sl_opcnt = resp->opcnt;
2353 slot->sl_status = resp->cstate.status;
2354 free_svc_cred(&slot->sl_cred);
2355 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2357 if (!nfsd4_cache_this(resp)) {
2358 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2361 slot->sl_flags |= NFSD4_SLOT_CACHED;
2363 base = resp->cstate.data_offset;
2364 slot->sl_datalen = buf->len - base;
2365 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2366 WARN(1, "%s: sessions DRC could not cache compound\n",
2372 * Encode the replay sequence operation from the slot values.
2373 * If cachethis is FALSE encode the uncached rep error on the next
2374 * operation which sets resp->p and increments resp->opcnt for
2375 * nfs4svc_encode_compoundres.
2379 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2380 struct nfsd4_compoundres *resp)
2382 struct nfsd4_op *op;
2383 struct nfsd4_slot *slot = resp->cstate.slot;
2385 /* Encode the replayed sequence operation */
2386 op = &args->ops[resp->opcnt - 1];
2387 nfsd4_encode_operation(resp, op);
2389 if (slot->sl_flags & NFSD4_SLOT_CACHED)
2391 if (args->opcnt == 1) {
2393 * The original operation wasn't a solo sequence--we
2394 * always cache those--so this retry must not match the
2397 op->status = nfserr_seq_false_retry;
2399 op = &args->ops[resp->opcnt++];
2400 op->status = nfserr_retry_uncached_rep;
2401 nfsd4_encode_operation(resp, op);
2407 * The sequence operation is not cached because we can use the slot and
2411 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2412 struct nfsd4_sequence *seq)
2414 struct nfsd4_slot *slot = resp->cstate.slot;
2415 struct xdr_stream *xdr = &resp->xdr;
2419 dprintk("--> %s slot %p\n", __func__, slot);
2421 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2425 p = xdr_reserve_space(xdr, slot->sl_datalen);
2428 return nfserr_serverfault;
2430 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2431 xdr_commit_encode(xdr);
2433 resp->opcnt = slot->sl_opcnt;
2434 return slot->sl_status;
2438 * Set the exchange_id flags returned by the server.
2441 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2443 #ifdef CONFIG_NFSD_PNFS
2444 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2446 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2449 /* Referrals are supported, Migration is not. */
2450 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2452 /* set the wire flags to return to client. */
2453 clid->flags = new->cl_exchange_flags;
2456 static bool client_has_openowners(struct nfs4_client *clp)
2458 struct nfs4_openowner *oo;
2460 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2461 if (!list_empty(&oo->oo_owner.so_stateids))
2467 static bool client_has_state(struct nfs4_client *clp)
2469 return client_has_openowners(clp)
2470 #ifdef CONFIG_NFSD_PNFS
2471 || !list_empty(&clp->cl_lo_states)
2473 || !list_empty(&clp->cl_delegations)
2474 || !list_empty(&clp->cl_sessions);
2478 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
2479 union nfsd4_op_u *u)
2481 struct nfsd4_exchange_id *exid = &u->exchange_id;
2482 struct nfs4_client *conf, *new;
2483 struct nfs4_client *unconf = NULL;
2485 char addr_str[INET6_ADDRSTRLEN];
2486 nfs4_verifier verf = exid->verifier;
2487 struct sockaddr *sa = svc_addr(rqstp);
2488 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2489 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2491 rpc_ntop(sa, addr_str, sizeof(addr_str));
2492 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2493 "ip_addr=%s flags %x, spa_how %d\n",
2494 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2495 addr_str, exid->flags, exid->spa_how);
2497 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2498 return nfserr_inval;
2500 new = create_client(exid->clname, rqstp, &verf);
2502 return nfserr_jukebox;
2504 switch (exid->spa_how) {
2506 exid->spo_must_enforce[0] = 0;
2507 exid->spo_must_enforce[1] = (
2508 1 << (OP_BIND_CONN_TO_SESSION - 32) |
2509 1 << (OP_EXCHANGE_ID - 32) |
2510 1 << (OP_CREATE_SESSION - 32) |
2511 1 << (OP_DESTROY_SESSION - 32) |
2512 1 << (OP_DESTROY_CLIENTID - 32));
2514 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2515 1 << (OP_OPEN_DOWNGRADE) |
2517 1 << (OP_DELEGRETURN));
2519 exid->spo_must_allow[1] &= (
2520 1 << (OP_TEST_STATEID - 32) |
2521 1 << (OP_FREE_STATEID - 32));
2522 if (!svc_rqst_integrity_protected(rqstp)) {
2523 status = nfserr_inval;
2527 * Sometimes userspace doesn't give us a principal.
2528 * Which is a bug, really. Anyway, we can't enforce
2529 * MACH_CRED in that case, better to give up now:
2531 if (!new->cl_cred.cr_principal &&
2532 !new->cl_cred.cr_raw_principal) {
2533 status = nfserr_serverfault;
2536 new->cl_mach_cred = true;
2539 default: /* checked by xdr code */
2542 status = nfserr_encr_alg_unsupp;
2546 /* Cases below refer to rfc 5661 section 18.35.4: */
2547 spin_lock(&nn->client_lock);
2548 conf = find_confirmed_client_by_name(&exid->clname, nn);
2550 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2551 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2554 if (!clp_used_exchangeid(conf)) { /* buggy client */
2555 status = nfserr_inval;
2558 if (!nfsd4_mach_creds_match(conf, rqstp)) {
2559 status = nfserr_wrong_cred;
2562 if (!creds_match) { /* case 9 */
2563 status = nfserr_perm;
2566 if (!verfs_match) { /* case 8 */
2567 status = nfserr_not_same;
2571 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2574 if (!creds_match) { /* case 3 */
2575 if (client_has_state(conf)) {
2576 status = nfserr_clid_inuse;
2581 if (verfs_match) { /* case 2 */
2582 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2585 /* case 5, client reboot */
2590 if (update) { /* case 7 */
2591 status = nfserr_noent;
2595 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
2596 if (unconf) /* case 4, possible retry or client restart */
2597 unhash_client_locked(unconf);
2599 /* case 1 (normal case) */
2602 status = mark_client_expired_locked(conf);
2606 new->cl_minorversion = cstate->minorversion;
2607 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
2608 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
2611 add_to_unconfirmed(new);
2614 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2615 exid->clientid.cl_id = conf->cl_clientid.cl_id;
2617 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2618 nfsd4_set_ex_flags(conf, exid);
2620 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2621 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2625 spin_unlock(&nn->client_lock);
2630 expire_client(unconf);
2635 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2637 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2640 /* The slot is in use, and no response has been sent. */
2642 if (seqid == slot_seqid)
2643 return nfserr_jukebox;
2645 return nfserr_seq_misordered;
2647 /* Note unsigned 32-bit arithmetic handles wraparound: */
2648 if (likely(seqid == slot_seqid + 1))
2650 if (seqid == slot_seqid)
2651 return nfserr_replay_cache;
2652 return nfserr_seq_misordered;
2656 * Cache the create session result into the create session single DRC
2657 * slot cache by saving the xdr structure. sl_seqid has been set.
2658 * Do this for solo or embedded create session operations.
2661 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2662 struct nfsd4_clid_slot *slot, __be32 nfserr)
2664 slot->sl_status = nfserr;
2665 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2669 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2670 struct nfsd4_clid_slot *slot)
2672 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2673 return slot->sl_status;
2676 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2677 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2678 1 + /* MIN tag is length with zero, only length */ \
2679 3 + /* version, opcount, opcode */ \
2680 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2681 /* seqid, slotID, slotID, cache */ \
2682 4 ) * sizeof(__be32))
2684 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2685 2 + /* verifier: AUTH_NULL, length 0 */\
2687 1 + /* MIN tag is length with zero, only length */ \
2688 3 + /* opcount, opcode, opstatus*/ \
2689 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2690 /* seqid, slotID, slotID, slotID, status */ \
2691 5 ) * sizeof(__be32))
2693 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2695 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2697 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2698 return nfserr_toosmall;
2699 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2700 return nfserr_toosmall;
2701 ca->headerpadsz = 0;
2702 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2703 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2704 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2705 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2706 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2707 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2709 * Note decreasing slot size below client's request may make it
2710 * difficult for client to function correctly, whereas
2711 * decreasing the number of slots will (just?) affect
2712 * performance. When short on memory we therefore prefer to
2713 * decrease number of slots instead of their size. Clients that
2714 * request larger slots than they need will get poor results:
2716 ca->maxreqs = nfsd4_get_drc_mem(ca);
2718 return nfserr_jukebox;
2724 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2725 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2727 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2728 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2730 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2731 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2733 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2734 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2735 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2736 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2739 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2741 ca->headerpadsz = 0;
2743 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2744 return nfserr_toosmall;
2745 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2746 return nfserr_toosmall;
2747 ca->maxresp_cached = 0;
2749 return nfserr_toosmall;
2754 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2756 switch (cbs->flavor) {
2762 * GSS case: the spec doesn't allow us to return this
2763 * error. But it also doesn't allow us not to support
2765 * I'd rather this fail hard than return some error the
2766 * client might think it can already handle:
2768 return nfserr_encr_alg_unsupp;
2773 nfsd4_create_session(struct svc_rqst *rqstp,
2774 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
2776 struct nfsd4_create_session *cr_ses = &u->create_session;
2777 struct sockaddr *sa = svc_addr(rqstp);
2778 struct nfs4_client *conf, *unconf;
2779 struct nfs4_client *old = NULL;
2780 struct nfsd4_session *new;
2781 struct nfsd4_conn *conn;
2782 struct nfsd4_clid_slot *cs_slot = NULL;
2784 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2786 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2787 return nfserr_inval;
2788 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2791 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2794 status = check_backchannel_attrs(&cr_ses->back_channel);
2796 goto out_release_drc_mem;
2797 status = nfserr_jukebox;
2798 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2800 goto out_release_drc_mem;
2801 conn = alloc_conn_from_crses(rqstp, cr_ses);
2803 goto out_free_session;
2805 spin_lock(&nn->client_lock);
2806 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2807 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2808 WARN_ON_ONCE(conf && unconf);
2811 status = nfserr_wrong_cred;
2812 if (!nfsd4_mach_creds_match(conf, rqstp))
2814 cs_slot = &conf->cl_cs_slot;
2815 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2817 if (status == nfserr_replay_cache)
2818 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2821 } else if (unconf) {
2822 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2823 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2824 status = nfserr_clid_inuse;
2827 status = nfserr_wrong_cred;
2828 if (!nfsd4_mach_creds_match(unconf, rqstp))
2830 cs_slot = &unconf->cl_cs_slot;
2831 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2833 /* an unconfirmed replay returns misordered */
2834 status = nfserr_seq_misordered;
2837 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2839 status = mark_client_expired_locked(old);
2845 move_to_confirmed(unconf);
2848 status = nfserr_stale_clientid;
2852 /* Persistent sessions are not supported */
2853 cr_ses->flags &= ~SESSION4_PERSIST;
2854 /* Upshifting from TCP to RDMA is not supported */
2855 cr_ses->flags &= ~SESSION4_RDMA;
2857 init_session(rqstp, new, conf, cr_ses);
2858 nfsd4_get_session_locked(new);
2860 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2861 NFS4_MAX_SESSIONID_LEN);
2862 cs_slot->sl_seqid++;
2863 cr_ses->seqid = cs_slot->sl_seqid;
2865 /* cache solo and embedded create sessions under the client_lock */
2866 nfsd4_cache_create_session(cr_ses, cs_slot, status);
2867 spin_unlock(&nn->client_lock);
2868 /* init connection and backchannel */
2869 nfsd4_init_conn(rqstp, conn, new);
2870 nfsd4_put_session(new);
2875 spin_unlock(&nn->client_lock);
2880 __free_session(new);
2881 out_release_drc_mem:
2882 nfsd4_put_drc_mem(&cr_ses->fore_channel);
2886 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2889 case NFS4_CDFC4_FORE:
2890 case NFS4_CDFC4_BACK:
2892 case NFS4_CDFC4_FORE_OR_BOTH:
2893 case NFS4_CDFC4_BACK_OR_BOTH:
2894 *dir = NFS4_CDFC4_BOTH;
2897 return nfserr_inval;
2900 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
2901 struct nfsd4_compound_state *cstate,
2902 union nfsd4_op_u *u)
2904 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
2905 struct nfsd4_session *session = cstate->session;
2906 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2909 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2912 spin_lock(&nn->client_lock);
2913 session->se_cb_prog = bc->bc_cb_program;
2914 session->se_cb_sec = bc->bc_cb_sec;
2915 spin_unlock(&nn->client_lock);
2917 nfsd4_probe_callback(session->se_client);
2922 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2923 struct nfsd4_compound_state *cstate,
2924 union nfsd4_op_u *u)
2926 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
2928 struct nfsd4_conn *conn;
2929 struct nfsd4_session *session;
2930 struct net *net = SVC_NET(rqstp);
2931 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2933 if (!nfsd4_last_compound_op(rqstp))
2934 return nfserr_not_only_op;
2935 spin_lock(&nn->client_lock);
2936 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2937 spin_unlock(&nn->client_lock);
2939 goto out_no_session;
2940 status = nfserr_wrong_cred;
2941 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
2943 status = nfsd4_map_bcts_dir(&bcts->dir);
2946 conn = alloc_conn(rqstp, bcts->dir);
2947 status = nfserr_jukebox;
2950 nfsd4_init_conn(rqstp, conn, session);
2953 nfsd4_put_session(session);
2958 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2962 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2966 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
2967 union nfsd4_op_u *u)
2969 struct nfsd4_destroy_session *sessionid = &u->destroy_session;
2970 struct nfsd4_session *ses;
2972 int ref_held_by_me = 0;
2973 struct net *net = SVC_NET(r);
2974 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2976 status = nfserr_not_only_op;
2977 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2978 if (!nfsd4_last_compound_op(r))
2982 dump_sessionid(__func__, &sessionid->sessionid);
2983 spin_lock(&nn->client_lock);
2984 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2986 goto out_client_lock;
2987 status = nfserr_wrong_cred;
2988 if (!nfsd4_mach_creds_match(ses->se_client, r))
2989 goto out_put_session;
2990 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2992 goto out_put_session;
2993 unhash_session(ses);
2994 spin_unlock(&nn->client_lock);
2996 nfsd4_probe_callback_sync(ses->se_client);
2998 spin_lock(&nn->client_lock);
3001 nfsd4_put_session_locked(ses);
3003 spin_unlock(&nn->client_lock);
3008 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3010 struct nfsd4_conn *c;
3012 list_for_each_entry(c, &s->se_conns, cn_persession) {
3013 if (c->cn_xprt == xpt) {
3020 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3022 struct nfs4_client *clp = ses->se_client;
3023 struct nfsd4_conn *c;
3024 __be32 status = nfs_ok;
3027 spin_lock(&clp->cl_lock);
3028 c = __nfsd4_find_conn(new->cn_xprt, ses);
3031 status = nfserr_conn_not_bound_to_session;
3032 if (clp->cl_mach_cred)
3034 __nfsd4_hash_conn(new, ses);
3035 spin_unlock(&clp->cl_lock);
3036 ret = nfsd4_register_conn(new);
3038 /* oops; xprt is already down: */
3039 nfsd4_conn_lost(&new->cn_xpt_user);
3042 spin_unlock(&clp->cl_lock);
3047 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3049 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3051 return args->opcnt > session->se_fchannel.maxops;
3054 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3055 struct nfsd4_session *session)
3057 struct xdr_buf *xb = &rqstp->rq_arg;
3059 return xb->len > session->se_fchannel.maxreq_sz;
3062 static bool replay_matches_cache(struct svc_rqst *rqstp,
3063 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3065 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3067 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3068 (bool)seq->cachethis)
3071 * If there's an error than the reply can have fewer ops than
3072 * the call. But if we cached a reply with *more* ops than the
3073 * call you're sending us now, then this new call is clearly not
3074 * really a replay of the old one:
3076 if (slot->sl_opcnt < argp->opcnt)
3078 /* This is the only check explicitly called by spec: */
3079 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3082 * There may be more comparisons we could actually do, but the
3083 * spec doesn't require us to catch every case where the calls
3084 * don't match (that would require caching the call as well as
3085 * the reply), so we don't bother.
3091 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3092 union nfsd4_op_u *u)
3094 struct nfsd4_sequence *seq = &u->sequence;
3095 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3096 struct xdr_stream *xdr = &resp->xdr;
3097 struct nfsd4_session *session;
3098 struct nfs4_client *clp;
3099 struct nfsd4_slot *slot;
3100 struct nfsd4_conn *conn;
3103 struct net *net = SVC_NET(rqstp);
3104 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3106 if (resp->opcnt != 1)
3107 return nfserr_sequence_pos;
3110 * Will be either used or freed by nfsd4_sequence_check_conn
3113 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3115 return nfserr_jukebox;
3117 spin_lock(&nn->client_lock);
3118 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3120 goto out_no_session;
3121 clp = session->se_client;
3123 status = nfserr_too_many_ops;
3124 if (nfsd4_session_too_many_ops(rqstp, session))
3125 goto out_put_session;
3127 status = nfserr_req_too_big;
3128 if (nfsd4_request_too_big(rqstp, session))
3129 goto out_put_session;
3131 status = nfserr_badslot;
3132 if (seq->slotid >= session->se_fchannel.maxreqs)
3133 goto out_put_session;
3135 slot = session->se_slots[seq->slotid];
3136 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3138 /* We do not negotiate the number of slots yet, so set the
3139 * maxslots to the session maxreqs which is used to encode
3140 * sr_highest_slotid and the sr_target_slot id to maxslots */
3141 seq->maxslots = session->se_fchannel.maxreqs;
3143 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3144 slot->sl_flags & NFSD4_SLOT_INUSE);
3145 if (status == nfserr_replay_cache) {
3146 status = nfserr_seq_misordered;
3147 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3148 goto out_put_session;
3149 status = nfserr_seq_false_retry;
3150 if (!replay_matches_cache(rqstp, seq, slot))
3151 goto out_put_session;
3152 cstate->slot = slot;
3153 cstate->session = session;
3155 /* Return the cached reply status and set cstate->status
3156 * for nfsd4_proc_compound processing */
3157 status = nfsd4_replay_cache_entry(resp, seq);
3158 cstate->status = nfserr_replay_cache;
3162 goto out_put_session;
3164 status = nfsd4_sequence_check_conn(conn, session);
3167 goto out_put_session;
3169 buflen = (seq->cachethis) ?
3170 session->se_fchannel.maxresp_cached :
3171 session->se_fchannel.maxresp_sz;
3172 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3174 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3175 goto out_put_session;
3176 svc_reserve(rqstp, buflen);
3179 /* Success! bump slot seqid */
3180 slot->sl_seqid = seq->seqid;
3181 slot->sl_flags |= NFSD4_SLOT_INUSE;
3183 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3185 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3187 cstate->slot = slot;
3188 cstate->session = session;
3192 switch (clp->cl_cb_state) {
3194 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3196 case NFSD4_CB_FAULT:
3197 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3200 seq->status_flags = 0;
3202 if (!list_empty(&clp->cl_revoked))
3203 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3207 spin_unlock(&nn->client_lock);
3210 nfsd4_put_session_locked(session);
3211 goto out_no_session;
3215 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3217 struct nfsd4_compound_state *cs = &resp->cstate;
3219 if (nfsd4_has_session(cs)) {
3220 if (cs->status != nfserr_replay_cache) {
3221 nfsd4_store_cache_entry(resp);
3222 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3224 /* Drop session reference that was taken in nfsd4_sequence() */
3225 nfsd4_put_session(cs->session);
3227 put_client_renew(cs->clp);
3231 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3232 struct nfsd4_compound_state *cstate,
3233 union nfsd4_op_u *u)
3235 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3236 struct nfs4_client *conf, *unconf;
3237 struct nfs4_client *clp = NULL;
3239 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3241 spin_lock(&nn->client_lock);
3242 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3243 conf = find_confirmed_client(&dc->clientid, true, nn);
3244 WARN_ON_ONCE(conf && unconf);
3247 if (client_has_state(conf)) {
3248 status = nfserr_clientid_busy;
3251 status = mark_client_expired_locked(conf);
3258 status = nfserr_stale_clientid;
3261 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3263 status = nfserr_wrong_cred;
3266 unhash_client_locked(clp);
3268 spin_unlock(&nn->client_lock);
3275 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3276 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3278 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3281 if (rc->rca_one_fs) {
3282 if (!cstate->current_fh.fh_dentry)
3283 return nfserr_nofilehandle;
3285 * We don't take advantage of the rca_one_fs case.
3286 * That's OK, it's optional, we can safely ignore it.
3291 status = nfserr_complete_already;
3292 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3293 &cstate->session->se_client->cl_flags))
3296 status = nfserr_stale_clientid;
3297 if (is_client_expired(cstate->session->se_client))
3299 * The following error isn't really legal.
3300 * But we only get here if the client just explicitly
3301 * destroyed the client. Surely it no longer cares what
3302 * error it gets back on an operation for the dead
3308 nfsd4_client_record_create(cstate->session->se_client);
3314 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3315 union nfsd4_op_u *u)
3317 struct nfsd4_setclientid *setclid = &u->setclientid;
3318 struct xdr_netobj clname = setclid->se_name;
3319 nfs4_verifier clverifier = setclid->se_verf;
3320 struct nfs4_client *conf, *new;
3321 struct nfs4_client *unconf = NULL;
3323 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3325 new = create_client(clname, rqstp, &clverifier);
3327 return nfserr_jukebox;
3328 /* Cases below refer to rfc 3530 section 14.2.33: */
3329 spin_lock(&nn->client_lock);
3330 conf = find_confirmed_client_by_name(&clname, nn);
3331 if (conf && client_has_state(conf)) {
3333 status = nfserr_clid_inuse;
3334 if (clp_used_exchangeid(conf))
3336 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3337 char addr_str[INET6_ADDRSTRLEN];
3338 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3340 dprintk("NFSD: setclientid: string in use by client "
3341 "at %s\n", addr_str);
3345 unconf = find_unconfirmed_client_by_name(&clname, nn);
3347 unhash_client_locked(unconf);
3348 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3349 /* case 1: probable callback update */
3350 copy_clid(new, conf);
3351 gen_confirm(new, nn);
3352 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3354 new->cl_minorversion = 0;
3355 gen_callback(new, setclid, rqstp);
3356 add_to_unconfirmed(new);
3357 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3358 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3359 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3363 spin_unlock(&nn->client_lock);
3367 expire_client(unconf);
3373 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3374 struct nfsd4_compound_state *cstate,
3375 union nfsd4_op_u *u)
3377 struct nfsd4_setclientid_confirm *setclientid_confirm =
3378 &u->setclientid_confirm;
3379 struct nfs4_client *conf, *unconf;
3380 struct nfs4_client *old = NULL;
3381 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3382 clientid_t * clid = &setclientid_confirm->sc_clientid;
3384 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3386 if (STALE_CLIENTID(clid, nn))
3387 return nfserr_stale_clientid;
3389 spin_lock(&nn->client_lock);
3390 conf = find_confirmed_client(clid, false, nn);
3391 unconf = find_unconfirmed_client(clid, false, nn);
3393 * We try hard to give out unique clientid's, so if we get an
3394 * attempt to confirm the same clientid with a different cred,
3395 * the client may be buggy; this should never happen.
3397 * Nevertheless, RFC 7530 recommends INUSE for this case:
3399 status = nfserr_clid_inuse;
3400 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3402 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3404 /* cases below refer to rfc 3530 section 14.2.34: */
3405 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3406 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3407 /* case 2: probable retransmit */
3409 } else /* case 4: client hasn't noticed we rebooted yet? */
3410 status = nfserr_stale_clientid;
3414 if (conf) { /* case 1: callback update */
3416 unhash_client_locked(old);
3417 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3418 } else { /* case 3: normal case; new or rebooted client */
3419 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3421 status = nfserr_clid_inuse;
3422 if (client_has_state(old)
3423 && !same_creds(&unconf->cl_cred,
3426 status = mark_client_expired_locked(old);
3432 move_to_confirmed(unconf);
3435 get_client_locked(conf);
3436 spin_unlock(&nn->client_lock);
3437 nfsd4_probe_callback(conf);
3438 spin_lock(&nn->client_lock);
3439 put_client_renew_locked(conf);
3441 spin_unlock(&nn->client_lock);
3447 static struct nfs4_file *nfsd4_alloc_file(void)
3449 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3452 /* OPEN Share state helper functions */
3453 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3454 struct nfs4_file *fp)
3456 lockdep_assert_held(&state_lock);
3458 refcount_set(&fp->fi_ref, 1);
3459 spin_lock_init(&fp->fi_lock);
3460 INIT_LIST_HEAD(&fp->fi_stateids);
3461 INIT_LIST_HEAD(&fp->fi_delegations);
3462 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3463 fh_copy_shallow(&fp->fi_fhandle, fh);
3464 fp->fi_deleg_file = NULL;
3465 fp->fi_had_conflict = false;
3466 fp->fi_share_deny = 0;
3467 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3468 memset(fp->fi_access, 0, sizeof(fp->fi_access));
3469 #ifdef CONFIG_NFSD_PNFS
3470 INIT_LIST_HEAD(&fp->fi_lo_states);
3471 atomic_set(&fp->fi_lo_recalls, 0);
3473 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3477 nfsd4_free_slabs(void)
3479 kmem_cache_destroy(client_slab);
3480 kmem_cache_destroy(openowner_slab);
3481 kmem_cache_destroy(lockowner_slab);
3482 kmem_cache_destroy(file_slab);
3483 kmem_cache_destroy(stateid_slab);
3484 kmem_cache_destroy(deleg_slab);
3485 kmem_cache_destroy(odstate_slab);
3489 nfsd4_init_slabs(void)
3491 client_slab = kmem_cache_create("nfsd4_clients",
3492 sizeof(struct nfs4_client), 0, 0, NULL);
3493 if (client_slab == NULL)
3495 openowner_slab = kmem_cache_create("nfsd4_openowners",
3496 sizeof(struct nfs4_openowner), 0, 0, NULL);
3497 if (openowner_slab == NULL)
3498 goto out_free_client_slab;
3499 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3500 sizeof(struct nfs4_lockowner), 0, 0, NULL);
3501 if (lockowner_slab == NULL)
3502 goto out_free_openowner_slab;
3503 file_slab = kmem_cache_create("nfsd4_files",
3504 sizeof(struct nfs4_file), 0, 0, NULL);
3505 if (file_slab == NULL)
3506 goto out_free_lockowner_slab;
3507 stateid_slab = kmem_cache_create("nfsd4_stateids",
3508 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3509 if (stateid_slab == NULL)
3510 goto out_free_file_slab;
3511 deleg_slab = kmem_cache_create("nfsd4_delegations",
3512 sizeof(struct nfs4_delegation), 0, 0, NULL);
3513 if (deleg_slab == NULL)
3514 goto out_free_stateid_slab;
3515 odstate_slab = kmem_cache_create("nfsd4_odstate",
3516 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3517 if (odstate_slab == NULL)
3518 goto out_free_deleg_slab;
3521 out_free_deleg_slab:
3522 kmem_cache_destroy(deleg_slab);
3523 out_free_stateid_slab:
3524 kmem_cache_destroy(stateid_slab);
3526 kmem_cache_destroy(file_slab);
3527 out_free_lockowner_slab:
3528 kmem_cache_destroy(lockowner_slab);
3529 out_free_openowner_slab:
3530 kmem_cache_destroy(openowner_slab);
3531 out_free_client_slab:
3532 kmem_cache_destroy(client_slab);
3534 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3538 static void init_nfs4_replay(struct nfs4_replay *rp)
3540 rp->rp_status = nfserr_serverfault;
3542 rp->rp_buf = rp->rp_ibuf;
3543 mutex_init(&rp->rp_mutex);
3546 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3547 struct nfs4_stateowner *so)
3549 if (!nfsd4_has_session(cstate)) {
3550 mutex_lock(&so->so_replay.rp_mutex);
3551 cstate->replay_owner = nfs4_get_stateowner(so);
3555 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3557 struct nfs4_stateowner *so = cstate->replay_owner;
3560 cstate->replay_owner = NULL;
3561 mutex_unlock(&so->so_replay.rp_mutex);
3562 nfs4_put_stateowner(so);
3566 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3568 struct nfs4_stateowner *sop;
3570 sop = kmem_cache_alloc(slab, GFP_KERNEL);
3574 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3575 if (!sop->so_owner.data) {
3576 kmem_cache_free(slab, sop);
3579 sop->so_owner.len = owner->len;
3581 INIT_LIST_HEAD(&sop->so_stateids);
3582 sop->so_client = clp;
3583 init_nfs4_replay(&sop->so_replay);
3584 atomic_set(&sop->so_count, 1);
3588 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3590 lockdep_assert_held(&clp->cl_lock);
3592 list_add(&oo->oo_owner.so_strhash,
3593 &clp->cl_ownerstr_hashtbl[strhashval]);
3594 list_add(&oo->oo_perclient, &clp->cl_openowners);
3597 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3599 unhash_openowner_locked(openowner(so));
3602 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3604 struct nfs4_openowner *oo = openowner(so);
3606 kmem_cache_free(openowner_slab, oo);
3609 static const struct nfs4_stateowner_operations openowner_ops = {
3610 .so_unhash = nfs4_unhash_openowner,
3611 .so_free = nfs4_free_openowner,
3614 static struct nfs4_ol_stateid *
3615 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3617 struct nfs4_ol_stateid *local, *ret = NULL;
3618 struct nfs4_openowner *oo = open->op_openowner;
3620 lockdep_assert_held(&fp->fi_lock);
3622 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3623 /* ignore lock owners */
3624 if (local->st_stateowner->so_is_open_owner == 0)
3626 if (local->st_stateowner != &oo->oo_owner)
3628 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
3630 refcount_inc(&ret->st_stid.sc_count);
3638 nfsd4_verify_open_stid(struct nfs4_stid *s)
3640 __be32 ret = nfs_ok;
3642 switch (s->sc_type) {
3646 case NFS4_CLOSED_STID:
3647 case NFS4_CLOSED_DELEG_STID:
3648 ret = nfserr_bad_stateid;
3650 case NFS4_REVOKED_DELEG_STID:
3651 ret = nfserr_deleg_revoked;
3656 /* Lock the stateid st_mutex, and deal with races with CLOSE */
3658 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
3662 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
3663 ret = nfsd4_verify_open_stid(&stp->st_stid);
3665 mutex_unlock(&stp->st_mutex);
3669 static struct nfs4_ol_stateid *
3670 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3672 struct nfs4_ol_stateid *stp;
3674 spin_lock(&fp->fi_lock);
3675 stp = nfsd4_find_existing_open(fp, open);
3676 spin_unlock(&fp->fi_lock);
3677 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
3679 nfs4_put_stid(&stp->st_stid);
3684 static struct nfs4_openowner *
3685 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3686 struct nfsd4_compound_state *cstate)
3688 struct nfs4_client *clp = cstate->clp;
3689 struct nfs4_openowner *oo, *ret;
3691 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3694 oo->oo_owner.so_ops = &openowner_ops;
3695 oo->oo_owner.so_is_open_owner = 1;
3696 oo->oo_owner.so_seqid = open->op_seqid;
3698 if (nfsd4_has_session(cstate))
3699 oo->oo_flags |= NFS4_OO_CONFIRMED;
3701 oo->oo_last_closed_stid = NULL;
3702 INIT_LIST_HEAD(&oo->oo_close_lru);
3703 spin_lock(&clp->cl_lock);
3704 ret = find_openstateowner_str_locked(strhashval, open, clp);
3706 hash_openowner(oo, clp, strhashval);
3709 nfs4_free_stateowner(&oo->oo_owner);
3711 spin_unlock(&clp->cl_lock);
3715 static struct nfs4_ol_stateid *
3716 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
3719 struct nfs4_openowner *oo = open->op_openowner;
3720 struct nfs4_ol_stateid *retstp = NULL;
3721 struct nfs4_ol_stateid *stp;
3724 /* We are moving these outside of the spinlocks to avoid the warnings */
3725 mutex_init(&stp->st_mutex);
3726 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
3729 spin_lock(&oo->oo_owner.so_client->cl_lock);
3730 spin_lock(&fp->fi_lock);
3732 retstp = nfsd4_find_existing_open(fp, open);
3736 open->op_stp = NULL;
3737 refcount_inc(&stp->st_stid.sc_count);
3738 stp->st_stid.sc_type = NFS4_OPEN_STID;
3739 INIT_LIST_HEAD(&stp->st_locks);
3740 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3742 stp->st_stid.sc_file = fp;
3743 stp->st_access_bmap = 0;
3744 stp->st_deny_bmap = 0;
3745 stp->st_openstp = NULL;
3746 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3747 list_add(&stp->st_perfile, &fp->fi_stateids);
3750 spin_unlock(&fp->fi_lock);
3751 spin_unlock(&oo->oo_owner.so_client->cl_lock);
3753 /* Handle races with CLOSE */
3754 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
3755 nfs4_put_stid(&retstp->st_stid);
3758 /* To keep mutex tracking happy */
3759 mutex_unlock(&stp->st_mutex);
3766 * In the 4.0 case we need to keep the owners around a little while to handle
3767 * CLOSE replay. We still do need to release any file access that is held by
3768 * them before returning however.
3771 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3773 struct nfs4_ol_stateid *last;
3774 struct nfs4_openowner *oo = openowner(s->st_stateowner);
3775 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3778 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3781 * We know that we hold one reference via nfsd4_close, and another
3782 * "persistent" reference for the client. If the refcount is higher
3783 * than 2, then there are still calls in progress that are using this
3784 * stateid. We can't put the sc_file reference until they are finished.
3785 * Wait for the refcount to drop to 2. Since it has been unhashed,
3786 * there should be no danger of the refcount going back up again at
3789 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
3791 release_all_access(s);
3792 if (s->st_stid.sc_file) {
3793 put_nfs4_file(s->st_stid.sc_file);
3794 s->st_stid.sc_file = NULL;
3797 spin_lock(&nn->client_lock);
3798 last = oo->oo_last_closed_stid;
3799 oo->oo_last_closed_stid = s;
3800 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3801 oo->oo_time = get_seconds();
3802 spin_unlock(&nn->client_lock);
3804 nfs4_put_stid(&last->st_stid);
3807 /* search file_hashtbl[] for file */
3808 static struct nfs4_file *
3809 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3811 struct nfs4_file *fp;
3813 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3814 if (fh_match(&fp->fi_fhandle, fh)) {
3815 if (refcount_inc_not_zero(&fp->fi_ref))
3823 find_file(struct knfsd_fh *fh)
3825 struct nfs4_file *fp;
3826 unsigned int hashval = file_hashval(fh);
3829 fp = find_file_locked(fh, hashval);
3834 static struct nfs4_file *
3835 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3837 struct nfs4_file *fp;
3838 unsigned int hashval = file_hashval(fh);
3841 fp = find_file_locked(fh, hashval);
3846 spin_lock(&state_lock);
3847 fp = find_file_locked(fh, hashval);
3848 if (likely(fp == NULL)) {
3849 nfsd4_init_file(fh, hashval, new);
3852 spin_unlock(&state_lock);
3858 * Called to check deny when READ with all zero stateid or
3859 * WRITE with all zero or all one stateid
3862 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3864 struct nfs4_file *fp;
3865 __be32 ret = nfs_ok;
3867 fp = find_file(¤t_fh->fh_handle);
3870 /* Check for conflicting share reservations */
3871 spin_lock(&fp->fi_lock);
3872 if (fp->fi_share_deny & deny_type)
3873 ret = nfserr_locked;
3874 spin_unlock(&fp->fi_lock);
3879 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3881 struct nfs4_delegation *dp = cb_to_delegation(cb);
3882 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3885 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3888 * We can't do this in nfsd_break_deleg_cb because it is
3889 * already holding inode->i_lock.
3891 * If the dl_time != 0, then we know that it has already been
3892 * queued for a lease break. Don't queue it again.
3894 spin_lock(&state_lock);
3895 if (dp->dl_time == 0) {
3896 dp->dl_time = get_seconds();
3897 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3899 spin_unlock(&state_lock);
3902 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3903 struct rpc_task *task)
3905 struct nfs4_delegation *dp = cb_to_delegation(cb);
3907 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3910 switch (task->tk_status) {
3914 case -NFS4ERR_BAD_STATEID:
3916 * Race: client probably got cb_recall before open reply
3917 * granting delegation.
3919 if (dp->dl_retries--) {
3920 rpc_delay(task, 2 * HZ);
3929 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3931 struct nfs4_delegation *dp = cb_to_delegation(cb);
3933 nfs4_put_stid(&dp->dl_stid);
3936 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3937 .prepare = nfsd4_cb_recall_prepare,
3938 .done = nfsd4_cb_recall_done,
3939 .release = nfsd4_cb_recall_release,
3942 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3945 * We're assuming the state code never drops its reference
3946 * without first removing the lease. Since we're in this lease
3947 * callback (and since the lease code is serialized by the kernel
3948 * lock) we know the server hasn't removed the lease yet, we know
3949 * it's safe to take a reference.
3951 refcount_inc(&dp->dl_stid.sc_count);
3952 nfsd4_run_cb(&dp->dl_recall);
3955 /* Called from break_lease() with i_lock held. */
3957 nfsd_break_deleg_cb(struct file_lock *fl)
3960 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
3961 struct nfs4_file *fp = dp->dl_stid.sc_file;
3964 * We don't want the locks code to timeout the lease for us;
3965 * we'll remove it ourself if a delegation isn't returned
3968 fl->fl_break_time = 0;
3970 spin_lock(&fp->fi_lock);
3971 fp->fi_had_conflict = true;
3972 nfsd_break_one_deleg(dp);
3973 spin_unlock(&fp->fi_lock);
3978 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3979 struct list_head *dispose)
3982 return lease_modify(onlist, arg, dispose);
3987 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3988 .lm_break = nfsd_break_deleg_cb,
3989 .lm_change = nfsd_change_deleg_cb,
3992 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3994 if (nfsd4_has_session(cstate))
3996 if (seqid == so->so_seqid - 1)
3997 return nfserr_replay_me;
3998 if (seqid == so->so_seqid)
4000 return nfserr_bad_seqid;
4003 static __be32 lookup_clientid(clientid_t *clid,
4004 struct nfsd4_compound_state *cstate,
4005 struct nfsd_net *nn)
4007 struct nfs4_client *found;
4010 found = cstate->clp;
4011 if (!same_clid(&found->cl_clientid, clid))
4012 return nfserr_stale_clientid;
4016 if (STALE_CLIENTID(clid, nn))
4017 return nfserr_stale_clientid;
4020 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4021 * cached already then we know this is for is for v4.0 and "sessions"
4024 WARN_ON_ONCE(cstate->session);
4025 spin_lock(&nn->client_lock);
4026 found = find_confirmed_client(clid, false, nn);
4028 spin_unlock(&nn->client_lock);
4029 return nfserr_expired;
4031 atomic_inc(&found->cl_refcount);
4032 spin_unlock(&nn->client_lock);
4034 /* Cache the nfs4_client in cstate! */
4035 cstate->clp = found;
4040 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4041 struct nfsd4_open *open, struct nfsd_net *nn)
4043 clientid_t *clientid = &open->op_clientid;
4044 struct nfs4_client *clp = NULL;
4045 unsigned int strhashval;
4046 struct nfs4_openowner *oo = NULL;
4049 if (STALE_CLIENTID(&open->op_clientid, nn))
4050 return nfserr_stale_clientid;
4052 * In case we need it later, after we've already created the
4053 * file and don't want to risk a further failure:
4055 open->op_file = nfsd4_alloc_file();
4056 if (open->op_file == NULL)
4057 return nfserr_jukebox;
4059 status = lookup_clientid(clientid, cstate, nn);
4064 strhashval = ownerstr_hashval(&open->op_owner);
4065 oo = find_openstateowner_str(strhashval, open, clp);
4066 open->op_openowner = oo;
4070 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4071 /* Replace unconfirmed owners without checking for replay. */
4072 release_openowner(oo);
4073 open->op_openowner = NULL;
4076 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4081 oo = alloc_init_open_stateowner(strhashval, open, cstate);
4083 return nfserr_jukebox;
4084 open->op_openowner = oo;
4086 open->op_stp = nfs4_alloc_open_stateid(clp);
4088 return nfserr_jukebox;
4090 if (nfsd4_has_session(cstate) &&
4091 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4092 open->op_odstate = alloc_clnt_odstate(clp);
4093 if (!open->op_odstate)
4094 return nfserr_jukebox;
4100 static inline __be32
4101 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4103 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4104 return nfserr_openmode;
4109 static int share_access_to_flags(u32 share_access)
4111 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4114 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4116 struct nfs4_stid *ret;
4118 ret = find_stateid_by_type(cl, s,
4119 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4122 return delegstateid(ret);
4125 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4127 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4128 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4132 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4133 struct nfs4_delegation **dp)
4136 __be32 status = nfserr_bad_stateid;
4137 struct nfs4_delegation *deleg;
4139 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4142 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4143 nfs4_put_stid(&deleg->dl_stid);
4144 if (cl->cl_minorversion)
4145 status = nfserr_deleg_revoked;
4148 flags = share_access_to_flags(open->op_share_access);
4149 status = nfs4_check_delegmode(deleg, flags);
4151 nfs4_put_stid(&deleg->dl_stid);
4156 if (!nfsd4_is_deleg_cur(open))
4160 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4164 static inline int nfs4_access_to_access(u32 nfs4_access)
4168 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4169 flags |= NFSD_MAY_READ;
4170 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4171 flags |= NFSD_MAY_WRITE;
4175 static inline __be32
4176 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4177 struct nfsd4_open *open)
4179 struct iattr iattr = {
4180 .ia_valid = ATTR_SIZE,
4183 if (!open->op_truncate)
4185 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4186 return nfserr_inval;
4187 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4190 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4191 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4192 struct nfsd4_open *open)
4194 struct file *filp = NULL;
4196 int oflag = nfs4_access_to_omode(open->op_share_access);
4197 int access = nfs4_access_to_access(open->op_share_access);
4198 unsigned char old_access_bmap, old_deny_bmap;
4200 spin_lock(&fp->fi_lock);
4203 * Are we trying to set a deny mode that would conflict with
4206 status = nfs4_file_check_deny(fp, open->op_share_deny);
4207 if (status != nfs_ok) {
4208 spin_unlock(&fp->fi_lock);
4212 /* set access to the file */
4213 status = nfs4_file_get_access(fp, open->op_share_access);
4214 if (status != nfs_ok) {
4215 spin_unlock(&fp->fi_lock);
4219 /* Set access bits in stateid */
4220 old_access_bmap = stp->st_access_bmap;
4221 set_access(open->op_share_access, stp);
4223 /* Set new deny mask */
4224 old_deny_bmap = stp->st_deny_bmap;
4225 set_deny(open->op_share_deny, stp);
4226 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4228 if (!fp->fi_fds[oflag]) {
4229 spin_unlock(&fp->fi_lock);
4230 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
4232 goto out_put_access;
4233 spin_lock(&fp->fi_lock);
4234 if (!fp->fi_fds[oflag]) {
4235 fp->fi_fds[oflag] = filp;
4239 spin_unlock(&fp->fi_lock);
4243 status = nfsd4_truncate(rqstp, cur_fh, open);
4245 goto out_put_access;
4249 stp->st_access_bmap = old_access_bmap;
4250 nfs4_file_put_access(fp, open->op_share_access);
4251 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4256 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)
4259 unsigned char old_deny_bmap = stp->st_deny_bmap;
4261 if (!test_access(open->op_share_access, stp))
4262 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4264 /* test and set deny mode */
4265 spin_lock(&fp->fi_lock);
4266 status = nfs4_file_check_deny(fp, open->op_share_deny);
4267 if (status == nfs_ok) {
4268 set_deny(open->op_share_deny, stp);
4269 fp->fi_share_deny |=
4270 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4272 spin_unlock(&fp->fi_lock);
4274 if (status != nfs_ok)
4277 status = nfsd4_truncate(rqstp, cur_fh, open);
4278 if (status != nfs_ok)
4279 reset_union_bmap_deny(old_deny_bmap, stp);
4283 /* Should we give out recallable state?: */
4284 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4286 if (clp->cl_cb_state == NFSD4_CB_UP)
4289 * In the sessions case, since we don't have to establish a
4290 * separate connection for callbacks, we assume it's OK
4291 * until we hear otherwise:
4293 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4296 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
4299 struct file_lock *fl;
4301 fl = locks_alloc_lock();
4304 fl->fl_lmops = &nfsd_lease_mng_ops;
4305 fl->fl_flags = FL_DELEG;
4306 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4307 fl->fl_end = OFFSET_MAX;
4308 fl->fl_owner = (fl_owner_t)dp;
4309 fl->fl_pid = current->tgid;
4310 fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file;
4314 static struct nfs4_delegation *
4315 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4316 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4319 struct nfs4_delegation *dp;
4321 struct file_lock *fl;
4324 * The fi_had_conflict and nfs_get_existing_delegation checks
4325 * here are just optimizations; we'll need to recheck them at
4328 if (fp->fi_had_conflict)
4329 return ERR_PTR(-EAGAIN);
4331 filp = find_readable_file(fp);
4333 /* We should always have a readable file here */
4335 return ERR_PTR(-EBADF);
4337 spin_lock(&state_lock);
4338 spin_lock(&fp->fi_lock);
4339 if (nfs4_delegation_exists(clp, fp))
4341 else if (!fp->fi_deleg_file) {
4342 fp->fi_deleg_file = filp;
4343 /* increment early to prevent fi_deleg_file from being
4345 fp->fi_delegees = 1;
4349 spin_unlock(&fp->fi_lock);
4350 spin_unlock(&state_lock);
4354 return ERR_PTR(status);
4357 dp = alloc_init_deleg(clp, fp, fh, odstate);
4361 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
4365 status = vfs_setlease(fp->fi_deleg_file, fl->fl_type, &fl, NULL);
4367 locks_free_lock(fl);
4369 goto out_clnt_odstate;
4371 spin_lock(&state_lock);
4372 spin_lock(&fp->fi_lock);
4373 if (fp->fi_had_conflict)
4376 status = hash_delegation_locked(dp, fp);
4377 spin_unlock(&fp->fi_lock);
4378 spin_unlock(&state_lock);
4381 destroy_unhashed_deleg(dp);
4384 put_clnt_odstate(dp->dl_clnt_odstate);
4386 nfs4_put_stid(&dp->dl_stid);
4389 return ERR_PTR(status);
4392 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4394 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4395 if (status == -EAGAIN)
4396 open->op_why_no_deleg = WND4_CONTENTION;
4398 open->op_why_no_deleg = WND4_RESOURCE;
4399 switch (open->op_deleg_want) {
4400 case NFS4_SHARE_WANT_READ_DELEG:
4401 case NFS4_SHARE_WANT_WRITE_DELEG:
4402 case NFS4_SHARE_WANT_ANY_DELEG:
4404 case NFS4_SHARE_WANT_CANCEL:
4405 open->op_why_no_deleg = WND4_CANCELLED;
4407 case NFS4_SHARE_WANT_NO_DELEG:
4414 * Attempt to hand out a delegation.
4416 * Note we don't support write delegations, and won't until the vfs has
4417 * proper support for them.
4420 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4421 struct nfs4_ol_stateid *stp)
4423 struct nfs4_delegation *dp;
4424 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4425 struct nfs4_client *clp = stp->st_stid.sc_client;
4429 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4430 open->op_recall = 0;
4431 switch (open->op_claim_type) {
4432 case NFS4_OPEN_CLAIM_PREVIOUS:
4434 open->op_recall = 1;
4435 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4438 case NFS4_OPEN_CLAIM_NULL:
4439 case NFS4_OPEN_CLAIM_FH:
4441 * Let's not give out any delegations till everyone's
4442 * had the chance to reclaim theirs, *and* until
4443 * NLM locks have all been reclaimed:
4445 if (locks_in_grace(clp->net))
4447 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4450 * Also, if the file was opened for write or
4451 * create, there's a good chance the client's
4452 * about to write to it, resulting in an
4453 * immediate recall (since we don't support
4454 * write delegations):
4456 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4458 if (open->op_create == NFS4_OPEN_CREATE)
4464 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4468 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4470 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4471 STATEID_VAL(&dp->dl_stid.sc_stateid));
4472 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4473 nfs4_put_stid(&dp->dl_stid);
4476 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4477 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4478 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4479 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4480 open->op_recall = 1;
4483 /* 4.1 client asking for a delegation? */
4484 if (open->op_deleg_want)
4485 nfsd4_open_deleg_none_ext(open, status);
4489 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4490 struct nfs4_delegation *dp)
4492 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4493 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4494 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4495 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4496 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4497 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4498 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4499 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4501 /* Otherwise the client must be confused wanting a delegation
4502 * it already has, therefore we don't return
4503 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4508 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4510 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4511 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4512 struct nfs4_file *fp = NULL;
4513 struct nfs4_ol_stateid *stp = NULL;
4514 struct nfs4_delegation *dp = NULL;
4516 bool new_stp = false;
4519 * Lookup file; if found, lookup stateid and check open request,
4520 * and check for delegations in the process of being recalled.
4521 * If not found, create the nfs4_file struct
4523 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
4524 if (fp != open->op_file) {
4525 status = nfs4_check_deleg(cl, open, &dp);
4528 stp = nfsd4_find_and_lock_existing_open(fp, open);
4530 open->op_file = NULL;
4531 status = nfserr_bad_stateid;
4532 if (nfsd4_is_deleg_cur(open))
4537 stp = init_open_stateid(fp, open);
4543 * OPEN the file, or upgrade an existing OPEN.
4544 * If truncate fails, the OPEN fails.
4546 * stp is already locked.
4549 /* Stateid was found, this is an OPEN upgrade */
4550 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4552 mutex_unlock(&stp->st_mutex);
4556 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4558 stp->st_stid.sc_type = NFS4_CLOSED_STID;
4559 release_open_stateid(stp);
4560 mutex_unlock(&stp->st_mutex);
4564 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4566 if (stp->st_clnt_odstate == open->op_odstate)
4567 open->op_odstate = NULL;
4570 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4571 mutex_unlock(&stp->st_mutex);
4573 if (nfsd4_has_session(&resp->cstate)) {
4574 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4575 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4576 open->op_why_no_deleg = WND4_NOT_WANTED;
4582 * Attempt to hand out a delegation. No error return, because the
4583 * OPEN succeeds even if we fail.
4585 nfs4_open_delegation(current_fh, open, stp);
4589 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4590 STATEID_VAL(&stp->st_stid.sc_stateid));
4592 /* 4.1 client trying to upgrade/downgrade delegation? */
4593 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4594 open->op_deleg_want)
4595 nfsd4_deleg_xgrade_none_ext(open, dp);
4599 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4600 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4602 * To finish the open response, we just need to set the rflags.
4604 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4605 if (nfsd4_has_session(&resp->cstate))
4606 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
4607 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
4608 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4611 nfs4_put_stid(&dp->dl_stid);
4613 nfs4_put_stid(&stp->st_stid);
4618 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4619 struct nfsd4_open *open)
4621 if (open->op_openowner) {
4622 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4624 nfsd4_cstate_assign_replay(cstate, so);
4625 nfs4_put_stateowner(so);
4628 kmem_cache_free(file_slab, open->op_file);
4630 nfs4_put_stid(&open->op_stp->st_stid);
4631 if (open->op_odstate)
4632 kmem_cache_free(odstate_slab, open->op_odstate);
4636 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4637 union nfsd4_op_u *u)
4639 clientid_t *clid = &u->renew;
4640 struct nfs4_client *clp;
4642 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4644 dprintk("process_renew(%08x/%08x): starting\n",
4645 clid->cl_boot, clid->cl_id);
4646 status = lookup_clientid(clid, cstate, nn);
4650 status = nfserr_cb_path_down;
4651 if (!list_empty(&clp->cl_delegations)
4652 && clp->cl_cb_state != NFSD4_CB_UP)
4660 nfsd4_end_grace(struct nfsd_net *nn)
4662 /* do nothing if grace period already ended */
4663 if (nn->grace_ended)
4666 dprintk("NFSD: end of grace period\n");
4667 nn->grace_ended = true;
4669 * If the server goes down again right now, an NFSv4
4670 * client will still be allowed to reclaim after it comes back up,
4671 * even if it hasn't yet had a chance to reclaim state this time.
4674 nfsd4_record_grace_done(nn);
4676 * At this point, NFSv4 clients can still reclaim. But if the
4677 * server crashes, any that have not yet reclaimed will be out
4678 * of luck on the next boot.
4680 * (NFSv4.1+ clients are considered to have reclaimed once they
4681 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4682 * have reclaimed after their first OPEN.)
4684 locks_end_grace(&nn->nfsd4_manager);
4686 * At this point, and once lockd and/or any other containers
4687 * exit their grace period, further reclaims will fail and
4688 * regular locking can resume.
4693 nfs4_laundromat(struct nfsd_net *nn)
4695 struct nfs4_client *clp;
4696 struct nfs4_openowner *oo;
4697 struct nfs4_delegation *dp;
4698 struct nfs4_ol_stateid *stp;
4699 struct nfsd4_blocked_lock *nbl;
4700 struct list_head *pos, *next, reaplist;
4701 time_t cutoff = get_seconds() - nn->nfsd4_lease;
4702 time_t t, new_timeo = nn->nfsd4_lease;
4704 dprintk("NFSD: laundromat service - starting\n");
4705 nfsd4_end_grace(nn);
4706 INIT_LIST_HEAD(&reaplist);
4707 spin_lock(&nn->client_lock);
4708 list_for_each_safe(pos, next, &nn->client_lru) {
4709 clp = list_entry(pos, struct nfs4_client, cl_lru);
4710 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4711 t = clp->cl_time - cutoff;
4712 new_timeo = min(new_timeo, t);
4715 if (mark_client_expired_locked(clp)) {
4716 dprintk("NFSD: client in use (clientid %08x)\n",
4717 clp->cl_clientid.cl_id);
4720 list_add(&clp->cl_lru, &reaplist);
4722 spin_unlock(&nn->client_lock);
4723 list_for_each_safe(pos, next, &reaplist) {
4724 clp = list_entry(pos, struct nfs4_client, cl_lru);
4725 dprintk("NFSD: purging unused client (clientid %08x)\n",
4726 clp->cl_clientid.cl_id);
4727 list_del_init(&clp->cl_lru);
4730 spin_lock(&state_lock);
4731 list_for_each_safe(pos, next, &nn->del_recall_lru) {
4732 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4733 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4734 t = dp->dl_time - cutoff;
4735 new_timeo = min(new_timeo, t);
4738 WARN_ON(!unhash_delegation_locked(dp));
4739 list_add(&dp->dl_recall_lru, &reaplist);
4741 spin_unlock(&state_lock);
4742 while (!list_empty(&reaplist)) {
4743 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4745 list_del_init(&dp->dl_recall_lru);
4746 revoke_delegation(dp);
4749 spin_lock(&nn->client_lock);
4750 while (!list_empty(&nn->close_lru)) {
4751 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4753 if (time_after((unsigned long)oo->oo_time,
4754 (unsigned long)cutoff)) {
4755 t = oo->oo_time - cutoff;
4756 new_timeo = min(new_timeo, t);
4759 list_del_init(&oo->oo_close_lru);
4760 stp = oo->oo_last_closed_stid;
4761 oo->oo_last_closed_stid = NULL;
4762 spin_unlock(&nn->client_lock);
4763 nfs4_put_stid(&stp->st_stid);
4764 spin_lock(&nn->client_lock);
4766 spin_unlock(&nn->client_lock);
4769 * It's possible for a client to try and acquire an already held lock
4770 * that is being held for a long time, and then lose interest in it.
4771 * So, we clean out any un-revisited request after a lease period
4772 * under the assumption that the client is no longer interested.
4774 * RFC5661, sec. 9.6 states that the client must not rely on getting
4775 * notifications and must continue to poll for locks, even when the
4776 * server supports them. Thus this shouldn't lead to clients blocking
4777 * indefinitely once the lock does become free.
4779 BUG_ON(!list_empty(&reaplist));
4780 spin_lock(&nn->blocked_locks_lock);
4781 while (!list_empty(&nn->blocked_locks_lru)) {
4782 nbl = list_first_entry(&nn->blocked_locks_lru,
4783 struct nfsd4_blocked_lock, nbl_lru);
4784 if (time_after((unsigned long)nbl->nbl_time,
4785 (unsigned long)cutoff)) {
4786 t = nbl->nbl_time - cutoff;
4787 new_timeo = min(new_timeo, t);
4790 list_move(&nbl->nbl_lru, &reaplist);
4791 list_del_init(&nbl->nbl_list);
4793 spin_unlock(&nn->blocked_locks_lock);
4795 while (!list_empty(&reaplist)) {
4796 nbl = list_first_entry(&reaplist,
4797 struct nfsd4_blocked_lock, nbl_lru);
4798 list_del_init(&nbl->nbl_lru);
4799 posix_unblock_lock(&nbl->nbl_lock);
4800 free_blocked_lock(nbl);
4803 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4807 static struct workqueue_struct *laundry_wq;
4808 static void laundromat_main(struct work_struct *);
4811 laundromat_main(struct work_struct *laundry)
4814 struct delayed_work *dwork = to_delayed_work(laundry);
4815 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4818 t = nfs4_laundromat(nn);
4819 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4820 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4823 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4825 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4826 return nfserr_bad_stateid;
4831 access_permit_read(struct nfs4_ol_stateid *stp)
4833 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4834 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4835 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4839 access_permit_write(struct nfs4_ol_stateid *stp)
4841 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4842 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4846 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4848 __be32 status = nfserr_openmode;
4850 /* For lock stateid's, we test the parent open, not the lock: */
4851 if (stp->st_openstp)
4852 stp = stp->st_openstp;
4853 if ((flags & WR_STATE) && !access_permit_write(stp))
4855 if ((flags & RD_STATE) && !access_permit_read(stp))
4862 static inline __be32
4863 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4865 if (ONE_STATEID(stateid) && (flags & RD_STATE))
4867 else if (opens_in_grace(net)) {
4868 /* Answer in remaining cases depends on existence of
4869 * conflicting state; so we must wait out the grace period. */
4870 return nfserr_grace;
4871 } else if (flags & WR_STATE)
4872 return nfs4_share_conflict(current_fh,
4873 NFS4_SHARE_DENY_WRITE);
4874 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4875 return nfs4_share_conflict(current_fh,
4876 NFS4_SHARE_DENY_READ);
4880 * Allow READ/WRITE during grace period on recovered state only for files
4881 * that are not able to provide mandatory locking.
4884 grace_disallows_io(struct net *net, struct inode *inode)
4886 return opens_in_grace(net) && mandatory_lock(inode);
4889 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4892 * When sessions are used the stateid generation number is ignored
4895 if (has_session && in->si_generation == 0)
4898 if (in->si_generation == ref->si_generation)
4901 /* If the client sends us a stateid from the future, it's buggy: */
4902 if (nfsd4_stateid_generation_after(in, ref))
4903 return nfserr_bad_stateid;
4905 * However, we could see a stateid from the past, even from a
4906 * non-buggy client. For example, if the client sends a lock
4907 * while some IO is outstanding, the lock may bump si_generation
4908 * while the IO is still in flight. The client could avoid that
4909 * situation by waiting for responses on all the IO requests,
4910 * but better performance may result in retrying IO that
4911 * receives an old_stateid error if requests are rarely
4912 * reordered in flight:
4914 return nfserr_old_stateid;
4917 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
4921 spin_lock(&s->sc_lock);
4922 ret = nfsd4_verify_open_stid(s);
4924 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
4925 spin_unlock(&s->sc_lock);
4929 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4931 if (ols->st_stateowner->so_is_open_owner &&
4932 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4933 return nfserr_bad_stateid;
4937 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4939 struct nfs4_stid *s;
4940 __be32 status = nfserr_bad_stateid;
4942 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
4943 CLOSE_STATEID(stateid))
4945 /* Client debugging aid. */
4946 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4947 char addr_str[INET6_ADDRSTRLEN];
4948 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4950 pr_warn_ratelimited("NFSD: client %s testing state ID "
4951 "with incorrect client ID\n", addr_str);
4954 spin_lock(&cl->cl_lock);
4955 s = find_stateid_locked(cl, stateid);
4958 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
4961 switch (s->sc_type) {
4962 case NFS4_DELEG_STID:
4965 case NFS4_REVOKED_DELEG_STID:
4966 status = nfserr_deleg_revoked;
4968 case NFS4_OPEN_STID:
4969 case NFS4_LOCK_STID:
4970 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
4973 printk("unknown stateid type %x\n", s->sc_type);
4975 case NFS4_CLOSED_STID:
4976 case NFS4_CLOSED_DELEG_STID:
4977 status = nfserr_bad_stateid;
4980 spin_unlock(&cl->cl_lock);
4985 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4986 stateid_t *stateid, unsigned char typemask,
4987 struct nfs4_stid **s, struct nfsd_net *nn)
4990 bool return_revoked = false;
4993 * only return revoked delegations if explicitly asked.
4994 * otherwise we report revoked or bad_stateid status.
4996 if (typemask & NFS4_REVOKED_DELEG_STID)
4997 return_revoked = true;
4998 else if (typemask & NFS4_DELEG_STID)
4999 typemask |= NFS4_REVOKED_DELEG_STID;
5001 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5002 CLOSE_STATEID(stateid))
5003 return nfserr_bad_stateid;
5004 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
5005 if (status == nfserr_stale_clientid) {
5006 if (cstate->session)
5007 return nfserr_bad_stateid;
5008 return nfserr_stale_stateid;
5012 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5014 return nfserr_bad_stateid;
5015 if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5017 if (cstate->minorversion)
5018 return nfserr_deleg_revoked;
5019 return nfserr_bad_stateid;
5024 static struct file *
5025 nfs4_find_file(struct nfs4_stid *s, int flags)
5030 switch (s->sc_type) {
5031 case NFS4_DELEG_STID:
5032 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5034 return get_file(s->sc_file->fi_deleg_file);
5035 case NFS4_OPEN_STID:
5036 case NFS4_LOCK_STID:
5037 if (flags & RD_STATE)
5038 return find_readable_file(s->sc_file);
5040 return find_writeable_file(s->sc_file);
5048 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
5052 status = nfsd4_check_openowner_confirmed(ols);
5055 return nfs4_check_openmode(ols, flags);
5059 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5060 struct file **filpp, bool *tmp_file, int flags)
5062 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5066 file = nfs4_find_file(s, flags);
5068 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5069 acc | NFSD_MAY_OWNER_OVERRIDE);
5077 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
5089 * Checks for stateid operations
5092 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5093 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5094 stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
5096 struct inode *ino = d_inode(fhp->fh_dentry);
5097 struct net *net = SVC_NET(rqstp);
5098 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5099 struct nfs4_stid *s = NULL;
5107 if (grace_disallows_io(net, ino))
5108 return nfserr_grace;
5110 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5111 status = check_special_stateids(net, fhp, stateid, flags);
5115 status = nfsd4_lookup_stateid(cstate, stateid,
5116 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5120 status = nfsd4_stid_check_stateid_generation(stateid, s,
5121 nfsd4_has_session(cstate));
5125 switch (s->sc_type) {
5126 case NFS4_DELEG_STID:
5127 status = nfs4_check_delegmode(delegstateid(s), flags);
5129 case NFS4_OPEN_STID:
5130 case NFS4_LOCK_STID:
5131 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
5134 status = nfserr_bad_stateid;
5139 status = nfs4_check_fh(fhp, s);
5142 if (!status && filpp)
5143 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
5151 * Test if the stateid is valid
5154 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5155 union nfsd4_op_u *u)
5157 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5158 struct nfsd4_test_stateid_id *stateid;
5159 struct nfs4_client *cl = cstate->session->se_client;
5161 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5162 stateid->ts_id_status =
5163 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5169 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5171 struct nfs4_ol_stateid *stp = openlockstateid(s);
5174 ret = nfsd4_lock_ol_stateid(stp);
5178 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5182 ret = nfserr_locks_held;
5183 if (check_for_locks(stp->st_stid.sc_file,
5184 lockowner(stp->st_stateowner)))
5187 release_lock_stateid(stp);
5191 mutex_unlock(&stp->st_mutex);
5198 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5199 union nfsd4_op_u *u)
5201 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5202 stateid_t *stateid = &free_stateid->fr_stateid;
5203 struct nfs4_stid *s;
5204 struct nfs4_delegation *dp;
5205 struct nfs4_client *cl = cstate->session->se_client;
5206 __be32 ret = nfserr_bad_stateid;
5208 spin_lock(&cl->cl_lock);
5209 s = find_stateid_locked(cl, stateid);
5212 spin_lock(&s->sc_lock);
5213 switch (s->sc_type) {
5214 case NFS4_DELEG_STID:
5215 ret = nfserr_locks_held;
5217 case NFS4_OPEN_STID:
5218 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5221 ret = nfserr_locks_held;
5223 case NFS4_LOCK_STID:
5224 spin_unlock(&s->sc_lock);
5225 refcount_inc(&s->sc_count);
5226 spin_unlock(&cl->cl_lock);
5227 ret = nfsd4_free_lock_stateid(stateid, s);
5229 case NFS4_REVOKED_DELEG_STID:
5230 spin_unlock(&s->sc_lock);
5231 dp = delegstateid(s);
5232 list_del_init(&dp->dl_recall_lru);
5233 spin_unlock(&cl->cl_lock);
5237 /* Default falls through and returns nfserr_bad_stateid */
5239 spin_unlock(&s->sc_lock);
5241 spin_unlock(&cl->cl_lock);
5249 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5250 RD_STATE : WR_STATE;
5253 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5255 struct svc_fh *current_fh = &cstate->current_fh;
5256 struct nfs4_stateowner *sop = stp->st_stateowner;
5259 status = nfsd4_check_seqid(cstate, sop, seqid);
5262 status = nfsd4_lock_ol_stateid(stp);
5263 if (status != nfs_ok)
5265 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5266 if (status == nfs_ok)
5267 status = nfs4_check_fh(current_fh, &stp->st_stid);
5268 if (status != nfs_ok)
5269 mutex_unlock(&stp->st_mutex);
5274 * Checks for sequence id mutating operations.
5277 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5278 stateid_t *stateid, char typemask,
5279 struct nfs4_ol_stateid **stpp,
5280 struct nfsd_net *nn)
5283 struct nfs4_stid *s;
5284 struct nfs4_ol_stateid *stp = NULL;
5286 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5287 seqid, STATEID_VAL(stateid));
5290 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5293 stp = openlockstateid(s);
5294 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5296 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5300 nfs4_put_stid(&stp->st_stid);
5304 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5305 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5308 struct nfs4_openowner *oo;
5309 struct nfs4_ol_stateid *stp;
5311 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5312 NFS4_OPEN_STID, &stp, nn);
5315 oo = openowner(stp->st_stateowner);
5316 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5317 mutex_unlock(&stp->st_mutex);
5318 nfs4_put_stid(&stp->st_stid);
5319 return nfserr_bad_stateid;
5326 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5327 union nfsd4_op_u *u)
5329 struct nfsd4_open_confirm *oc = &u->open_confirm;
5331 struct nfs4_openowner *oo;
5332 struct nfs4_ol_stateid *stp;
5333 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5335 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5336 cstate->current_fh.fh_dentry);
5338 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5342 status = nfs4_preprocess_seqid_op(cstate,
5343 oc->oc_seqid, &oc->oc_req_stateid,
5344 NFS4_OPEN_STID, &stp, nn);
5347 oo = openowner(stp->st_stateowner);
5348 status = nfserr_bad_stateid;
5349 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5350 mutex_unlock(&stp->st_mutex);
5353 oo->oo_flags |= NFS4_OO_CONFIRMED;
5354 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5355 mutex_unlock(&stp->st_mutex);
5356 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5357 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5359 nfsd4_client_record_create(oo->oo_owner.so_client);
5362 nfs4_put_stid(&stp->st_stid);
5364 nfsd4_bump_seqid(cstate, status);
5368 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5370 if (!test_access(access, stp))
5372 nfs4_file_put_access(stp->st_stid.sc_file, access);
5373 clear_access(access, stp);
5376 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5378 switch (to_access) {
5379 case NFS4_SHARE_ACCESS_READ:
5380 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5381 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5383 case NFS4_SHARE_ACCESS_WRITE:
5384 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5385 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5387 case NFS4_SHARE_ACCESS_BOTH:
5395 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5396 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
5398 struct nfsd4_open_downgrade *od = &u->open_downgrade;
5400 struct nfs4_ol_stateid *stp;
5401 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5403 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5404 cstate->current_fh.fh_dentry);
5406 /* We don't yet support WANT bits: */
5407 if (od->od_deleg_want)
5408 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5411 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5412 &od->od_stateid, &stp, nn);
5415 status = nfserr_inval;
5416 if (!test_access(od->od_share_access, stp)) {
5417 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5418 stp->st_access_bmap, od->od_share_access);
5421 if (!test_deny(od->od_share_deny, stp)) {
5422 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5423 stp->st_deny_bmap, od->od_share_deny);
5426 nfs4_stateid_downgrade(stp, od->od_share_access);
5427 reset_union_bmap_deny(od->od_share_deny, stp);
5428 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5431 mutex_unlock(&stp->st_mutex);
5432 nfs4_put_stid(&stp->st_stid);
5434 nfsd4_bump_seqid(cstate, status);
5438 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5440 struct nfs4_client *clp = s->st_stid.sc_client;
5442 LIST_HEAD(reaplist);
5444 spin_lock(&clp->cl_lock);
5445 unhashed = unhash_open_stateid(s, &reaplist);
5447 if (clp->cl_minorversion) {
5449 put_ol_stateid_locked(s, &reaplist);
5450 spin_unlock(&clp->cl_lock);
5451 free_ol_stateid_reaplist(&reaplist);
5453 spin_unlock(&clp->cl_lock);
5454 free_ol_stateid_reaplist(&reaplist);
5456 move_to_close_lru(s, clp->net);
5461 * nfs4_unlock_state() called after encode
5464 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5465 union nfsd4_op_u *u)
5467 struct nfsd4_close *close = &u->close;
5469 struct nfs4_ol_stateid *stp;
5470 struct net *net = SVC_NET(rqstp);
5471 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5473 dprintk("NFSD: nfsd4_close on file %pd\n",
5474 cstate->current_fh.fh_dentry);
5476 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5478 NFS4_OPEN_STID|NFS4_CLOSED_STID,
5480 nfsd4_bump_seqid(cstate, status);
5484 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5487 * Technically we don't _really_ have to increment or copy it, since
5488 * it should just be gone after this operation and we clobber the
5489 * copied value below, but we continue to do so here just to ensure
5490 * that racing ops see that there was a state change.
5492 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5494 nfsd4_close_open_stateid(stp);
5495 mutex_unlock(&stp->st_mutex);
5497 /* v4.1+ suggests that we send a special stateid in here, since the
5498 * clients should just ignore this anyway. Since this is not useful
5499 * for v4.0 clients either, we set it to the special close_stateid
5502 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
5504 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
5506 /* put reference from nfs4_preprocess_seqid_op */
5507 nfs4_put_stid(&stp->st_stid);
5513 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5514 union nfsd4_op_u *u)
5516 struct nfsd4_delegreturn *dr = &u->delegreturn;
5517 struct nfs4_delegation *dp;
5518 stateid_t *stateid = &dr->dr_stateid;
5519 struct nfs4_stid *s;
5521 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5523 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5526 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5529 dp = delegstateid(s);
5530 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
5534 destroy_delegation(dp);
5536 nfs4_put_stid(&dp->dl_stid);
5542 end_offset(u64 start, u64 len)
5547 return end >= start ? end: NFS4_MAX_UINT64;
5550 /* last octet in a range */
5552 last_byte_offset(u64 start, u64 len)
5558 return end > start ? end - 1: NFS4_MAX_UINT64;
5562 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5563 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5564 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5565 * locking, this prevents us from being completely protocol-compliant. The
5566 * real solution to this problem is to start using unsigned file offsets in
5567 * the VFS, but this is a very deep change!
5570 nfs4_transform_lock_offset(struct file_lock *lock)
5572 if (lock->fl_start < 0)
5573 lock->fl_start = OFFSET_MAX;
5574 if (lock->fl_end < 0)
5575 lock->fl_end = OFFSET_MAX;
5579 nfsd4_fl_get_owner(fl_owner_t owner)
5581 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5583 nfs4_get_stateowner(&lo->lo_owner);
5588 nfsd4_fl_put_owner(fl_owner_t owner)
5590 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5593 nfs4_put_stateowner(&lo->lo_owner);
5597 nfsd4_lm_notify(struct file_lock *fl)
5599 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
5600 struct net *net = lo->lo_owner.so_client->net;
5601 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5602 struct nfsd4_blocked_lock *nbl = container_of(fl,
5603 struct nfsd4_blocked_lock, nbl_lock);
5606 /* An empty list means that something else is going to be using it */
5607 spin_lock(&nn->blocked_locks_lock);
5608 if (!list_empty(&nbl->nbl_list)) {
5609 list_del_init(&nbl->nbl_list);
5610 list_del_init(&nbl->nbl_lru);
5613 spin_unlock(&nn->blocked_locks_lock);
5616 nfsd4_run_cb(&nbl->nbl_cb);
5619 static const struct lock_manager_operations nfsd_posix_mng_ops = {
5620 .lm_notify = nfsd4_lm_notify,
5621 .lm_get_owner = nfsd4_fl_get_owner,
5622 .lm_put_owner = nfsd4_fl_put_owner,
5626 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5628 struct nfs4_lockowner *lo;
5630 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5631 lo = (struct nfs4_lockowner *) fl->fl_owner;
5632 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5633 lo->lo_owner.so_owner.len, GFP_KERNEL);
5634 if (!deny->ld_owner.data)
5635 /* We just don't care that much */
5637 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5638 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5641 deny->ld_owner.len = 0;
5642 deny->ld_owner.data = NULL;
5643 deny->ld_clientid.cl_boot = 0;
5644 deny->ld_clientid.cl_id = 0;
5646 deny->ld_start = fl->fl_start;
5647 deny->ld_length = NFS4_MAX_UINT64;
5648 if (fl->fl_end != NFS4_MAX_UINT64)
5649 deny->ld_length = fl->fl_end - fl->fl_start + 1;
5650 deny->ld_type = NFS4_READ_LT;
5651 if (fl->fl_type != F_RDLCK)
5652 deny->ld_type = NFS4_WRITE_LT;
5655 static struct nfs4_lockowner *
5656 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5658 unsigned int strhashval = ownerstr_hashval(owner);
5659 struct nfs4_stateowner *so;
5661 lockdep_assert_held(&clp->cl_lock);
5663 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5665 if (so->so_is_open_owner)
5667 if (same_owner_str(so, owner))
5668 return lockowner(nfs4_get_stateowner(so));
5673 static struct nfs4_lockowner *
5674 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5676 struct nfs4_lockowner *lo;
5678 spin_lock(&clp->cl_lock);
5679 lo = find_lockowner_str_locked(clp, owner);
5680 spin_unlock(&clp->cl_lock);
5684 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5686 unhash_lockowner_locked(lockowner(sop));
5689 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5691 struct nfs4_lockowner *lo = lockowner(sop);
5693 kmem_cache_free(lockowner_slab, lo);
5696 static const struct nfs4_stateowner_operations lockowner_ops = {
5697 .so_unhash = nfs4_unhash_lockowner,
5698 .so_free = nfs4_free_lockowner,
5702 * Alloc a lock owner structure.
5703 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5706 * strhashval = ownerstr_hashval
5708 static struct nfs4_lockowner *
5709 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5710 struct nfs4_ol_stateid *open_stp,
5711 struct nfsd4_lock *lock)
5713 struct nfs4_lockowner *lo, *ret;
5715 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5718 INIT_LIST_HEAD(&lo->lo_blocked);
5719 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5720 lo->lo_owner.so_is_open_owner = 0;
5721 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5722 lo->lo_owner.so_ops = &lockowner_ops;
5723 spin_lock(&clp->cl_lock);
5724 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5726 list_add(&lo->lo_owner.so_strhash,
5727 &clp->cl_ownerstr_hashtbl[strhashval]);
5730 nfs4_free_stateowner(&lo->lo_owner);
5732 spin_unlock(&clp->cl_lock);
5736 static struct nfs4_ol_stateid *
5737 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5739 struct nfs4_ol_stateid *lst;
5740 struct nfs4_client *clp = lo->lo_owner.so_client;
5742 lockdep_assert_held(&clp->cl_lock);
5744 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5745 if (lst->st_stid.sc_type != NFS4_LOCK_STID)
5747 if (lst->st_stid.sc_file == fp) {
5748 refcount_inc(&lst->st_stid.sc_count);
5755 static struct nfs4_ol_stateid *
5756 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5757 struct nfs4_file *fp, struct inode *inode,
5758 struct nfs4_ol_stateid *open_stp)
5760 struct nfs4_client *clp = lo->lo_owner.so_client;
5761 struct nfs4_ol_stateid *retstp;
5763 mutex_init(&stp->st_mutex);
5764 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
5766 spin_lock(&clp->cl_lock);
5767 spin_lock(&fp->fi_lock);
5768 retstp = find_lock_stateid(lo, fp);
5772 refcount_inc(&stp->st_stid.sc_count);
5773 stp->st_stid.sc_type = NFS4_LOCK_STID;
5774 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5776 stp->st_stid.sc_file = fp;
5777 stp->st_access_bmap = 0;
5778 stp->st_deny_bmap = open_stp->st_deny_bmap;
5779 stp->st_openstp = open_stp;
5780 list_add(&stp->st_locks, &open_stp->st_locks);
5781 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5782 list_add(&stp->st_perfile, &fp->fi_stateids);
5784 spin_unlock(&fp->fi_lock);
5785 spin_unlock(&clp->cl_lock);
5787 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
5788 nfs4_put_stid(&retstp->st_stid);
5791 /* To keep mutex tracking happy */
5792 mutex_unlock(&stp->st_mutex);
5798 static struct nfs4_ol_stateid *
5799 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5800 struct inode *inode, struct nfs4_ol_stateid *ost,
5803 struct nfs4_stid *ns = NULL;
5804 struct nfs4_ol_stateid *lst;
5805 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5806 struct nfs4_client *clp = oo->oo_owner.so_client;
5809 spin_lock(&clp->cl_lock);
5810 lst = find_lock_stateid(lo, fi);
5811 spin_unlock(&clp->cl_lock);
5813 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
5815 nfs4_put_stid(&lst->st_stid);
5817 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
5821 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
5822 if (lst == openlockstateid(ns))
5831 check_lock_length(u64 offset, u64 length)
5833 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5834 (length > ~offset)));
5837 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5839 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5841 lockdep_assert_held(&fp->fi_lock);
5843 if (test_access(access, lock_stp))
5845 __nfs4_file_get_access(fp, access);
5846 set_access(access, lock_stp);
5850 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5851 struct nfs4_ol_stateid *ost,
5852 struct nfsd4_lock *lock,
5853 struct nfs4_ol_stateid **plst, bool *new)
5856 struct nfs4_file *fi = ost->st_stid.sc_file;
5857 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5858 struct nfs4_client *cl = oo->oo_owner.so_client;
5859 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5860 struct nfs4_lockowner *lo;
5861 struct nfs4_ol_stateid *lst;
5862 unsigned int strhashval;
5864 lo = find_lockowner_str(cl, &lock->lk_new_owner);
5866 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5867 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5869 return nfserr_jukebox;
5871 /* with an existing lockowner, seqids must be the same */
5872 status = nfserr_bad_seqid;
5873 if (!cstate->minorversion &&
5874 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5878 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5880 status = nfserr_jukebox;
5887 nfs4_put_stateowner(&lo->lo_owner);
5895 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5896 union nfsd4_op_u *u)
5898 struct nfsd4_lock *lock = &u->lock;
5899 struct nfs4_openowner *open_sop = NULL;
5900 struct nfs4_lockowner *lock_sop = NULL;
5901 struct nfs4_ol_stateid *lock_stp = NULL;
5902 struct nfs4_ol_stateid *open_stp = NULL;
5903 struct nfs4_file *fp;
5904 struct file *filp = NULL;
5905 struct nfsd4_blocked_lock *nbl = NULL;
5906 struct file_lock *file_lock = NULL;
5907 struct file_lock *conflock = NULL;
5912 unsigned char fl_type;
5913 unsigned int fl_flags = FL_POSIX;
5914 struct net *net = SVC_NET(rqstp);
5915 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5917 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5918 (long long) lock->lk_offset,
5919 (long long) lock->lk_length);
5921 if (check_lock_length(lock->lk_offset, lock->lk_length))
5922 return nfserr_inval;
5924 if ((status = fh_verify(rqstp, &cstate->current_fh,
5925 S_IFREG, NFSD_MAY_LOCK))) {
5926 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5930 if (lock->lk_is_new) {
5931 if (nfsd4_has_session(cstate))
5932 /* See rfc 5661 18.10.3: given clientid is ignored: */
5933 memcpy(&lock->lk_new_clientid,
5934 &cstate->session->se_client->cl_clientid,
5935 sizeof(clientid_t));
5937 status = nfserr_stale_clientid;
5938 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5941 /* validate and update open stateid and open seqid */
5942 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5943 lock->lk_new_open_seqid,
5944 &lock->lk_new_open_stateid,
5948 mutex_unlock(&open_stp->st_mutex);
5949 open_sop = openowner(open_stp->st_stateowner);
5950 status = nfserr_bad_stateid;
5951 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5952 &lock->lk_new_clientid))
5954 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5957 status = nfs4_preprocess_seqid_op(cstate,
5958 lock->lk_old_lock_seqid,
5959 &lock->lk_old_lock_stateid,
5960 NFS4_LOCK_STID, &lock_stp, nn);
5964 lock_sop = lockowner(lock_stp->st_stateowner);
5966 lkflg = setlkflg(lock->lk_type);
5967 status = nfs4_check_openmode(lock_stp, lkflg);
5971 status = nfserr_grace;
5972 if (locks_in_grace(net) && !lock->lk_reclaim)
5974 status = nfserr_no_grace;
5975 if (!locks_in_grace(net) && lock->lk_reclaim)
5978 fp = lock_stp->st_stid.sc_file;
5979 switch (lock->lk_type) {
5981 if (nfsd4_has_session(cstate))
5982 fl_flags |= FL_SLEEP;
5985 spin_lock(&fp->fi_lock);
5986 filp = find_readable_file_locked(fp);
5988 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5989 spin_unlock(&fp->fi_lock);
5992 case NFS4_WRITEW_LT:
5993 if (nfsd4_has_session(cstate))
5994 fl_flags |= FL_SLEEP;
5997 spin_lock(&fp->fi_lock);
5998 filp = find_writeable_file_locked(fp);
6000 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6001 spin_unlock(&fp->fi_lock);
6005 status = nfserr_inval;
6010 status = nfserr_openmode;
6014 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6016 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6017 status = nfserr_jukebox;
6021 file_lock = &nbl->nbl_lock;
6022 file_lock->fl_type = fl_type;
6023 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6024 file_lock->fl_pid = current->tgid;
6025 file_lock->fl_file = filp;
6026 file_lock->fl_flags = fl_flags;
6027 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6028 file_lock->fl_start = lock->lk_offset;
6029 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6030 nfs4_transform_lock_offset(file_lock);
6032 conflock = locks_alloc_lock();
6034 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6035 status = nfserr_jukebox;
6039 if (fl_flags & FL_SLEEP) {
6040 nbl->nbl_time = jiffies;
6041 spin_lock(&nn->blocked_locks_lock);
6042 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6043 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6044 spin_unlock(&nn->blocked_locks_lock);
6047 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
6049 case 0: /* success! */
6050 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6053 case FILE_LOCK_DEFERRED:
6056 case -EAGAIN: /* conflock holds conflicting lock */
6057 status = nfserr_denied;
6058 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6059 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6062 status = nfserr_deadlock;
6065 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6066 status = nfserrno(err);
6071 /* dequeue it if we queued it before */
6072 if (fl_flags & FL_SLEEP) {
6073 spin_lock(&nn->blocked_locks_lock);
6074 list_del_init(&nbl->nbl_list);
6075 list_del_init(&nbl->nbl_lru);
6076 spin_unlock(&nn->blocked_locks_lock);
6078 free_blocked_lock(nbl);
6083 /* Bump seqid manually if the 4.0 replay owner is openowner */
6084 if (cstate->replay_owner &&
6085 cstate->replay_owner != &lock_sop->lo_owner &&
6086 seqid_mutating_err(ntohl(status)))
6087 lock_sop->lo_owner.so_seqid++;
6090 * If this is a new, never-before-used stateid, and we are
6091 * returning an error, then just go ahead and release it.
6094 release_lock_stateid(lock_stp);
6096 mutex_unlock(&lock_stp->st_mutex);
6098 nfs4_put_stid(&lock_stp->st_stid);
6101 nfs4_put_stid(&open_stp->st_stid);
6102 nfsd4_bump_seqid(cstate, status);
6104 locks_free_lock(conflock);
6109 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6110 * so we do a temporary open here just to get an open file to pass to
6111 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6114 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6117 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
6119 err = nfserrno(vfs_test_lock(file, lock));
6129 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6130 union nfsd4_op_u *u)
6132 struct nfsd4_lockt *lockt = &u->lockt;
6133 struct file_lock *file_lock = NULL;
6134 struct nfs4_lockowner *lo = NULL;
6136 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6138 if (locks_in_grace(SVC_NET(rqstp)))
6139 return nfserr_grace;
6141 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6142 return nfserr_inval;
6144 if (!nfsd4_has_session(cstate)) {
6145 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
6150 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6153 file_lock = locks_alloc_lock();
6155 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6156 status = nfserr_jukebox;
6160 switch (lockt->lt_type) {
6163 file_lock->fl_type = F_RDLCK;
6166 case NFS4_WRITEW_LT:
6167 file_lock->fl_type = F_WRLCK;
6170 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6171 status = nfserr_inval;
6175 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6177 file_lock->fl_owner = (fl_owner_t)lo;
6178 file_lock->fl_pid = current->tgid;
6179 file_lock->fl_flags = FL_POSIX;
6181 file_lock->fl_start = lockt->lt_offset;
6182 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6184 nfs4_transform_lock_offset(file_lock);
6186 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6190 if (file_lock->fl_type != F_UNLCK) {
6191 status = nfserr_denied;
6192 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6196 nfs4_put_stateowner(&lo->lo_owner);
6198 locks_free_lock(file_lock);
6203 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6204 union nfsd4_op_u *u)
6206 struct nfsd4_locku *locku = &u->locku;
6207 struct nfs4_ol_stateid *stp;
6208 struct file *filp = NULL;
6209 struct file_lock *file_lock = NULL;
6212 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6214 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6215 (long long) locku->lu_offset,
6216 (long long) locku->lu_length);
6218 if (check_lock_length(locku->lu_offset, locku->lu_length))
6219 return nfserr_inval;
6221 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6222 &locku->lu_stateid, NFS4_LOCK_STID,
6226 filp = find_any_file(stp->st_stid.sc_file);
6228 status = nfserr_lock_range;
6231 file_lock = locks_alloc_lock();
6233 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6234 status = nfserr_jukebox;
6238 file_lock->fl_type = F_UNLCK;
6239 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6240 file_lock->fl_pid = current->tgid;
6241 file_lock->fl_file = filp;
6242 file_lock->fl_flags = FL_POSIX;
6243 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6244 file_lock->fl_start = locku->lu_offset;
6246 file_lock->fl_end = last_byte_offset(locku->lu_offset,
6248 nfs4_transform_lock_offset(file_lock);
6250 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
6252 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6255 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6259 mutex_unlock(&stp->st_mutex);
6260 nfs4_put_stid(&stp->st_stid);
6262 nfsd4_bump_seqid(cstate, status);
6264 locks_free_lock(file_lock);
6268 status = nfserrno(err);
6274 * true: locks held by lockowner
6275 * false: no locks held by lockowner
6278 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6280 struct file_lock *fl;
6282 struct file *filp = find_any_file(fp);
6283 struct inode *inode;
6284 struct file_lock_context *flctx;
6287 /* Any valid lock stateid should have some sort of access */
6292 inode = file_inode(filp);
6293 flctx = inode->i_flctx;
6295 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6296 spin_lock(&flctx->flc_lock);
6297 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6298 if (fl->fl_owner == (fl_owner_t)lowner) {
6303 spin_unlock(&flctx->flc_lock);
6310 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6311 struct nfsd4_compound_state *cstate,
6312 union nfsd4_op_u *u)
6314 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6315 clientid_t *clid = &rlockowner->rl_clientid;
6316 struct nfs4_stateowner *sop;
6317 struct nfs4_lockowner *lo = NULL;
6318 struct nfs4_ol_stateid *stp;
6319 struct xdr_netobj *owner = &rlockowner->rl_owner;
6320 unsigned int hashval = ownerstr_hashval(owner);
6322 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6323 struct nfs4_client *clp;
6324 LIST_HEAD (reaplist);
6326 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6327 clid->cl_boot, clid->cl_id);
6329 status = lookup_clientid(clid, cstate, nn);
6334 /* Find the matching lock stateowner */
6335 spin_lock(&clp->cl_lock);
6336 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6339 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6342 /* see if there are still any locks associated with it */
6343 lo = lockowner(sop);
6344 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6345 if (check_for_locks(stp->st_stid.sc_file, lo)) {
6346 status = nfserr_locks_held;
6347 spin_unlock(&clp->cl_lock);
6352 nfs4_get_stateowner(sop);
6356 spin_unlock(&clp->cl_lock);
6360 unhash_lockowner_locked(lo);
6361 while (!list_empty(&lo->lo_owner.so_stateids)) {
6362 stp = list_first_entry(&lo->lo_owner.so_stateids,
6363 struct nfs4_ol_stateid,
6365 WARN_ON(!unhash_lock_stateid(stp));
6366 put_ol_stateid_locked(stp, &reaplist);
6368 spin_unlock(&clp->cl_lock);
6369 free_ol_stateid_reaplist(&reaplist);
6370 remove_blocked_locks(lo);
6371 nfs4_put_stateowner(&lo->lo_owner);
6376 static inline struct nfs4_client_reclaim *
6379 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6383 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
6385 struct nfs4_client_reclaim *crp;
6387 crp = nfsd4_find_reclaim_client(name, nn);
6388 return (crp && crp->cr_clp);
6392 * failure => all reset bets are off, nfserr_no_grace...
6394 struct nfs4_client_reclaim *
6395 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
6397 unsigned int strhashval;
6398 struct nfs4_client_reclaim *crp;
6400 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
6401 crp = alloc_reclaim();
6403 strhashval = clientstr_hashval(name);
6404 INIT_LIST_HEAD(&crp->cr_strhash);
6405 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6406 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
6408 nn->reclaim_str_hashtbl_size++;
6414 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6416 list_del(&crp->cr_strhash);
6418 nn->reclaim_str_hashtbl_size--;
6422 nfs4_release_reclaim(struct nfsd_net *nn)
6424 struct nfs4_client_reclaim *crp = NULL;
6427 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6428 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6429 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6430 struct nfs4_client_reclaim, cr_strhash);
6431 nfs4_remove_reclaim_record(crp, nn);
6434 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6438 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6439 struct nfs4_client_reclaim *
6440 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6442 unsigned int strhashval;
6443 struct nfs4_client_reclaim *crp = NULL;
6445 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6447 strhashval = clientstr_hashval(recdir);
6448 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6449 if (same_name(crp->cr_recdir, recdir)) {
6457 * Called from OPEN. Look for clientid in reclaim list.
6460 nfs4_check_open_reclaim(clientid_t *clid,
6461 struct nfsd4_compound_state *cstate,
6462 struct nfsd_net *nn)
6466 /* find clientid in conf_id_hashtbl */
6467 status = lookup_clientid(clid, cstate, nn);
6469 return nfserr_reclaim_bad;
6471 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6472 return nfserr_no_grace;
6474 if (nfsd4_client_record_check(cstate->clp))
6475 return nfserr_reclaim_bad;
6480 #ifdef CONFIG_NFSD_FAULT_INJECTION
6482 put_client(struct nfs4_client *clp)
6484 atomic_dec(&clp->cl_refcount);
6487 static struct nfs4_client *
6488 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6490 struct nfs4_client *clp;
6491 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6494 if (!nfsd_netns_ready(nn))
6497 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6498 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
6505 nfsd_inject_print_clients(void)
6507 struct nfs4_client *clp;
6509 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6511 char buf[INET6_ADDRSTRLEN];
6513 if (!nfsd_netns_ready(nn))
6516 spin_lock(&nn->client_lock);
6517 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6518 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6519 pr_info("NFS Client: %s\n", buf);
6522 spin_unlock(&nn->client_lock);
6528 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
6531 struct nfs4_client *clp;
6532 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6535 if (!nfsd_netns_ready(nn))
6538 spin_lock(&nn->client_lock);
6539 clp = nfsd_find_client(addr, addr_size);
6541 if (mark_client_expired_locked(clp) == nfs_ok)
6546 spin_unlock(&nn->client_lock);
6555 nfsd_inject_forget_clients(u64 max)
6558 struct nfs4_client *clp, *next;
6559 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6561 LIST_HEAD(reaplist);
6563 if (!nfsd_netns_ready(nn))
6566 spin_lock(&nn->client_lock);
6567 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6568 if (mark_client_expired_locked(clp) == nfs_ok) {
6569 list_add(&clp->cl_lru, &reaplist);
6570 if (max != 0 && ++count >= max)
6574 spin_unlock(&nn->client_lock);
6576 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
6582 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
6585 char buf[INET6_ADDRSTRLEN];
6586 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6587 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
6591 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
6592 struct list_head *collect)
6594 struct nfs4_client *clp = lst->st_stid.sc_client;
6595 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6601 lockdep_assert_held(&nn->client_lock);
6602 atomic_inc(&clp->cl_refcount);
6603 list_add(&lst->st_locks, collect);
6606 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
6607 struct list_head *collect,
6608 bool (*func)(struct nfs4_ol_stateid *))
6610 struct nfs4_openowner *oop;
6611 struct nfs4_ol_stateid *stp, *st_next;
6612 struct nfs4_ol_stateid *lst, *lst_next;
6615 spin_lock(&clp->cl_lock);
6616 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
6617 list_for_each_entry_safe(stp, st_next,
6618 &oop->oo_owner.so_stateids, st_perstateowner) {
6619 list_for_each_entry_safe(lst, lst_next,
6620 &stp->st_locks, st_locks) {
6623 nfsd_inject_add_lock_to_list(lst,
6628 * Despite the fact that these functions deal
6629 * with 64-bit integers for "count", we must
6630 * ensure that it doesn't blow up the
6631 * clp->cl_refcount. Throw a warning if we
6632 * start to approach INT_MAX here.
6634 WARN_ON_ONCE(count == (INT_MAX / 2));
6641 spin_unlock(&clp->cl_lock);
6647 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
6650 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
6654 nfsd_print_client_locks(struct nfs4_client *clp)
6656 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
6657 nfsd_print_count(clp, count, "locked files");
6662 nfsd_inject_print_locks(void)
6664 struct nfs4_client *clp;
6666 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6669 if (!nfsd_netns_ready(nn))
6672 spin_lock(&nn->client_lock);
6673 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6674 count += nfsd_print_client_locks(clp);
6675 spin_unlock(&nn->client_lock);
6681 nfsd_reap_locks(struct list_head *reaplist)
6683 struct nfs4_client *clp;
6684 struct nfs4_ol_stateid *stp, *next;
6686 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
6687 list_del_init(&stp->st_locks);
6688 clp = stp->st_stid.sc_client;
6689 nfs4_put_stid(&stp->st_stid);
6695 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
6697 unsigned int count = 0;
6698 struct nfs4_client *clp;
6699 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6701 LIST_HEAD(reaplist);
6703 if (!nfsd_netns_ready(nn))
6706 spin_lock(&nn->client_lock);
6707 clp = nfsd_find_client(addr, addr_size);
6709 count = nfsd_collect_client_locks(clp, &reaplist, 0);
6710 spin_unlock(&nn->client_lock);
6711 nfsd_reap_locks(&reaplist);
6716 nfsd_inject_forget_locks(u64 max)
6719 struct nfs4_client *clp;
6720 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6722 LIST_HEAD(reaplist);
6724 if (!nfsd_netns_ready(nn))
6727 spin_lock(&nn->client_lock);
6728 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6729 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
6730 if (max != 0 && count >= max)
6733 spin_unlock(&nn->client_lock);
6734 nfsd_reap_locks(&reaplist);
6739 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
6740 struct list_head *collect,
6741 void (*func)(struct nfs4_openowner *))
6743 struct nfs4_openowner *oop, *next;
6744 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6748 lockdep_assert_held(&nn->client_lock);
6750 spin_lock(&clp->cl_lock);
6751 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
6755 atomic_inc(&clp->cl_refcount);
6756 list_add(&oop->oo_perclient, collect);
6761 * Despite the fact that these functions deal with
6762 * 64-bit integers for "count", we must ensure that
6763 * it doesn't blow up the clp->cl_refcount. Throw a
6764 * warning if we start to approach INT_MAX here.
6766 WARN_ON_ONCE(count == (INT_MAX / 2));
6770 spin_unlock(&clp->cl_lock);
6776 nfsd_print_client_openowners(struct nfs4_client *clp)
6778 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6780 nfsd_print_count(clp, count, "openowners");
6785 nfsd_collect_client_openowners(struct nfs4_client *clp,
6786 struct list_head *collect, u64 max)
6788 return nfsd_foreach_client_openowner(clp, max, collect,
6789 unhash_openowner_locked);
6793 nfsd_inject_print_openowners(void)
6795 struct nfs4_client *clp;
6797 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6800 if (!nfsd_netns_ready(nn))
6803 spin_lock(&nn->client_lock);
6804 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6805 count += nfsd_print_client_openowners(clp);
6806 spin_unlock(&nn->client_lock);
6812 nfsd_reap_openowners(struct list_head *reaplist)
6814 struct nfs4_client *clp;
6815 struct nfs4_openowner *oop, *next;
6817 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6818 list_del_init(&oop->oo_perclient);
6819 clp = oop->oo_owner.so_client;
6820 release_openowner(oop);
6826 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6829 unsigned int count = 0;
6830 struct nfs4_client *clp;
6831 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6833 LIST_HEAD(reaplist);
6835 if (!nfsd_netns_ready(nn))
6838 spin_lock(&nn->client_lock);
6839 clp = nfsd_find_client(addr, addr_size);
6841 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6842 spin_unlock(&nn->client_lock);
6843 nfsd_reap_openowners(&reaplist);
6848 nfsd_inject_forget_openowners(u64 max)
6851 struct nfs4_client *clp;
6852 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6854 LIST_HEAD(reaplist);
6856 if (!nfsd_netns_ready(nn))
6859 spin_lock(&nn->client_lock);
6860 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6861 count += nfsd_collect_client_openowners(clp, &reaplist,
6863 if (max != 0 && count >= max)
6866 spin_unlock(&nn->client_lock);
6867 nfsd_reap_openowners(&reaplist);
6871 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6872 struct list_head *victims)
6874 struct nfs4_delegation *dp, *next;
6875 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6879 lockdep_assert_held(&nn->client_lock);
6881 spin_lock(&state_lock);
6882 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6885 * It's not safe to mess with delegations that have a
6886 * non-zero dl_time. They might have already been broken
6887 * and could be processed by the laundromat outside of
6888 * the state_lock. Just leave them be.
6890 if (dp->dl_time != 0)
6893 atomic_inc(&clp->cl_refcount);
6894 WARN_ON(!unhash_delegation_locked(dp));
6895 list_add(&dp->dl_recall_lru, victims);
6899 * Despite the fact that these functions deal with
6900 * 64-bit integers for "count", we must ensure that
6901 * it doesn't blow up the clp->cl_refcount. Throw a
6902 * warning if we start to approach INT_MAX here.
6904 WARN_ON_ONCE(count == (INT_MAX / 2));
6908 spin_unlock(&state_lock);
6913 nfsd_print_client_delegations(struct nfs4_client *clp)
6915 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6917 nfsd_print_count(clp, count, "delegations");
6922 nfsd_inject_print_delegations(void)
6924 struct nfs4_client *clp;
6926 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6929 if (!nfsd_netns_ready(nn))
6932 spin_lock(&nn->client_lock);
6933 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6934 count += nfsd_print_client_delegations(clp);
6935 spin_unlock(&nn->client_lock);
6941 nfsd_forget_delegations(struct list_head *reaplist)
6943 struct nfs4_client *clp;
6944 struct nfs4_delegation *dp, *next;
6946 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6947 list_del_init(&dp->dl_recall_lru);
6948 clp = dp->dl_stid.sc_client;
6949 revoke_delegation(dp);
6955 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6959 struct nfs4_client *clp;
6960 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6962 LIST_HEAD(reaplist);
6964 if (!nfsd_netns_ready(nn))
6967 spin_lock(&nn->client_lock);
6968 clp = nfsd_find_client(addr, addr_size);
6970 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6971 spin_unlock(&nn->client_lock);
6973 nfsd_forget_delegations(&reaplist);
6978 nfsd_inject_forget_delegations(u64 max)
6981 struct nfs4_client *clp;
6982 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6984 LIST_HEAD(reaplist);
6986 if (!nfsd_netns_ready(nn))
6989 spin_lock(&nn->client_lock);
6990 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6991 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6992 if (max != 0 && count >= max)
6995 spin_unlock(&nn->client_lock);
6996 nfsd_forget_delegations(&reaplist);
7001 nfsd_recall_delegations(struct list_head *reaplist)
7003 struct nfs4_client *clp;
7004 struct nfs4_delegation *dp, *next;
7006 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7007 list_del_init(&dp->dl_recall_lru);
7008 clp = dp->dl_stid.sc_client;
7010 * We skipped all entries that had a zero dl_time before,
7011 * so we can now reset the dl_time back to 0. If a delegation
7012 * break comes in now, then it won't make any difference since
7013 * we're recalling it either way.
7015 spin_lock(&state_lock);
7017 spin_unlock(&state_lock);
7018 nfsd_break_one_deleg(dp);
7024 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
7028 struct nfs4_client *clp;
7029 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7031 LIST_HEAD(reaplist);
7033 if (!nfsd_netns_ready(nn))
7036 spin_lock(&nn->client_lock);
7037 clp = nfsd_find_client(addr, addr_size);
7039 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7040 spin_unlock(&nn->client_lock);
7042 nfsd_recall_delegations(&reaplist);
7047 nfsd_inject_recall_delegations(u64 max)
7050 struct nfs4_client *clp, *next;
7051 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7053 LIST_HEAD(reaplist);
7055 if (!nfsd_netns_ready(nn))
7058 spin_lock(&nn->client_lock);
7059 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7060 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7061 if (max != 0 && ++count >= max)
7064 spin_unlock(&nn->client_lock);
7065 nfsd_recall_delegations(&reaplist);
7068 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7071 * Since the lifetime of a delegation isn't limited to that of an open, a
7072 * client may quite reasonably hang on to a delegation as long as it has
7073 * the inode cached. This becomes an obvious problem the first time a
7074 * client's inode cache approaches the size of the server's total memory.
7076 * For now we avoid this problem by imposing a hard limit on the number
7077 * of delegations, which varies according to the server's memory size.
7080 set_max_delegations(void)
7083 * Allow at most 4 delegations per megabyte of RAM. Quick
7084 * estimates suggest that in the worst case (where every delegation
7085 * is for a different inode), a delegation could take about 1.5K,
7086 * giving a worst case usage of about 6% of memory.
7088 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7091 static int nfs4_state_create_net(struct net *net)
7093 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7096 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7097 CLIENT_HASH_SIZE, GFP_KERNEL);
7098 if (!nn->conf_id_hashtbl)
7100 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
7101 CLIENT_HASH_SIZE, GFP_KERNEL);
7102 if (!nn->unconf_id_hashtbl)
7104 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
7105 SESSION_HASH_SIZE, GFP_KERNEL);
7106 if (!nn->sessionid_hashtbl)
7109 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7110 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7111 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7113 for (i = 0; i < SESSION_HASH_SIZE; i++)
7114 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7115 nn->conf_name_tree = RB_ROOT;
7116 nn->unconf_name_tree = RB_ROOT;
7117 nn->boot_time = get_seconds();
7118 nn->grace_ended = false;
7119 nn->nfsd4_manager.block_opens = true;
7120 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7121 INIT_LIST_HEAD(&nn->client_lru);
7122 INIT_LIST_HEAD(&nn->close_lru);
7123 INIT_LIST_HEAD(&nn->del_recall_lru);
7124 spin_lock_init(&nn->client_lock);
7126 spin_lock_init(&nn->blocked_locks_lock);
7127 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7129 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7135 kfree(nn->unconf_id_hashtbl);
7137 kfree(nn->conf_id_hashtbl);
7143 nfs4_state_destroy_net(struct net *net)
7146 struct nfs4_client *clp = NULL;
7147 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7149 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7150 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7151 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7152 destroy_client(clp);
7156 WARN_ON(!list_empty(&nn->blocked_locks_lru));
7158 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7159 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7160 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7161 destroy_client(clp);
7165 kfree(nn->sessionid_hashtbl);
7166 kfree(nn->unconf_id_hashtbl);
7167 kfree(nn->conf_id_hashtbl);
7172 nfs4_state_start_net(struct net *net)
7174 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7177 ret = nfs4_state_create_net(net);
7180 locks_start_grace(net, &nn->nfsd4_manager);
7181 nfsd4_client_tracking_init(net);
7182 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %x)\n",
7183 nn->nfsd4_grace, net->ns.inum);
7184 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7188 /* initialization to perform when the nfsd service is started: */
7191 nfs4_state_start(void)
7195 ret = set_callback_cred();
7199 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7200 if (laundry_wq == NULL) {
7202 goto out_cleanup_cred;
7204 ret = nfsd4_create_callback_queue();
7206 goto out_free_laundry;
7208 set_max_delegations();
7212 destroy_workqueue(laundry_wq);
7214 cleanup_callback_cred();
7219 nfs4_state_shutdown_net(struct net *net)
7221 struct nfs4_delegation *dp = NULL;
7222 struct list_head *pos, *next, reaplist;
7223 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7225 cancel_delayed_work_sync(&nn->laundromat_work);
7226 locks_end_grace(&nn->nfsd4_manager);
7228 INIT_LIST_HEAD(&reaplist);
7229 spin_lock(&state_lock);
7230 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7231 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7232 WARN_ON(!unhash_delegation_locked(dp));
7233 list_add(&dp->dl_recall_lru, &reaplist);
7235 spin_unlock(&state_lock);
7236 list_for_each_safe(pos, next, &reaplist) {
7237 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7238 list_del_init(&dp->dl_recall_lru);
7239 destroy_unhashed_deleg(dp);
7242 nfsd4_client_tracking_exit(net);
7243 nfs4_state_destroy_net(net);
7247 nfs4_state_shutdown(void)
7249 destroy_workqueue(laundry_wq);
7250 nfsd4_destroy_callback_queue();
7251 cleanup_callback_cred();
7255 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7257 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
7258 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7262 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7264 if (cstate->minorversion) {
7265 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7266 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7271 clear_current_stateid(struct nfsd4_compound_state *cstate)
7273 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7277 * functions to set current state id
7280 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7281 union nfsd4_op_u *u)
7283 put_stateid(cstate, &u->open_downgrade.od_stateid);
7287 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7288 union nfsd4_op_u *u)
7290 put_stateid(cstate, &u->open.op_stateid);
7294 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7295 union nfsd4_op_u *u)
7297 put_stateid(cstate, &u->close.cl_stateid);
7301 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7302 union nfsd4_op_u *u)
7304 put_stateid(cstate, &u->lock.lk_resp_stateid);
7308 * functions to consume current state id
7312 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
7313 union nfsd4_op_u *u)
7315 get_stateid(cstate, &u->open_downgrade.od_stateid);
7319 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
7320 union nfsd4_op_u *u)
7322 get_stateid(cstate, &u->delegreturn.dr_stateid);
7326 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
7327 union nfsd4_op_u *u)
7329 get_stateid(cstate, &u->free_stateid.fr_stateid);
7333 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
7334 union nfsd4_op_u *u)
7336 get_stateid(cstate, &u->setattr.sa_stateid);
7340 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
7341 union nfsd4_op_u *u)
7343 get_stateid(cstate, &u->close.cl_stateid);
7347 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
7348 union nfsd4_op_u *u)
7350 get_stateid(cstate, &u->locku.lu_stateid);
7354 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
7355 union nfsd4_op_u *u)
7357 get_stateid(cstate, &u->read.rd_stateid);
7361 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
7362 union nfsd4_op_u *u)
7364 get_stateid(cstate, &u->write.wr_stateid);