2 * Copyright (c) 2001 The Regents of the University of Michigan.
5 * Kendrick Smith <kmsmith@umich.edu>
6 * Andy Adamson <kandros@umich.edu>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include <linux/file.h>
37 #include <linux/slab.h>
38 #include <linux/namei.h>
39 #include <linux/swap.h>
40 #include <linux/pagemap.h>
41 #include <linux/ratelimit.h>
42 #include <linux/sunrpc/svcauth_gss.h>
43 #include <linux/sunrpc/addr.h>
44 #include <linux/jhash.h>
45 #include <linux/string_helpers.h>
49 #include "current_stateid.h"
53 #include "filecache.h"
55 #define NFSDDBG_FACILITY NFSDDBG_PROC
57 #define all_ones {{~0,~0},~0}
58 static const stateid_t one_stateid = {
60 .si_opaque = all_ones,
62 static const stateid_t zero_stateid = {
65 static const stateid_t currentstateid = {
68 static const stateid_t close_stateid = {
69 .si_generation = 0xffffffffU,
72 static u64 current_sessionid = 1;
74 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
75 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
76 #define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
77 #define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
79 /* forward declarations */
80 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
81 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
82 void nfsd4_end_grace(struct nfsd_net *nn);
83 static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
88 * Currently used for the del_recall_lru and file hash table. In an
89 * effort to decrease the scope of the client_mutex, this spinlock may
90 * eventually cover more:
92 static DEFINE_SPINLOCK(state_lock);
94 enum nfsd4_st_mutex_lock_subclass {
95 OPEN_STATEID_MUTEX = 0,
96 LOCK_STATEID_MUTEX = 1,
100 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
101 * the refcount on the open stateid to drop.
103 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
106 * A waitqueue where a writer to clients/#/ctl destroying a client can
107 * wait for cl_rpc_users to drop to 0 and then for the client to be
110 static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
112 static struct kmem_cache *client_slab;
113 static struct kmem_cache *openowner_slab;
114 static struct kmem_cache *lockowner_slab;
115 static struct kmem_cache *file_slab;
116 static struct kmem_cache *stateid_slab;
117 static struct kmem_cache *deleg_slab;
118 static struct kmem_cache *odstate_slab;
120 static void free_session(struct nfsd4_session *);
122 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
123 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
125 static bool is_session_dead(struct nfsd4_session *ses)
127 return ses->se_flags & NFS4_SESSION_DEAD;
130 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
132 if (atomic_read(&ses->se_ref) > ref_held_by_me)
133 return nfserr_jukebox;
134 ses->se_flags |= NFS4_SESSION_DEAD;
138 static bool is_client_expired(struct nfs4_client *clp)
140 return clp->cl_time == 0;
143 static __be32 get_client_locked(struct nfs4_client *clp)
145 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
147 lockdep_assert_held(&nn->client_lock);
149 if (is_client_expired(clp))
150 return nfserr_expired;
151 atomic_inc(&clp->cl_rpc_users);
155 /* must be called under the client_lock */
157 renew_client_locked(struct nfs4_client *clp)
159 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
161 if (is_client_expired(clp)) {
163 printk("%s: client (clientid %08x/%08x) already expired\n",
165 clp->cl_clientid.cl_boot,
166 clp->cl_clientid.cl_id);
170 dprintk("renewing client (clientid %08x/%08x)\n",
171 clp->cl_clientid.cl_boot,
172 clp->cl_clientid.cl_id);
173 list_move_tail(&clp->cl_lru, &nn->client_lru);
174 clp->cl_time = ktime_get_boottime_seconds();
177 static void put_client_renew_locked(struct nfs4_client *clp)
179 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
181 lockdep_assert_held(&nn->client_lock);
183 if (!atomic_dec_and_test(&clp->cl_rpc_users))
185 if (!is_client_expired(clp))
186 renew_client_locked(clp);
188 wake_up_all(&expiry_wq);
191 static void put_client_renew(struct nfs4_client *clp)
193 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
195 if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
197 if (!is_client_expired(clp))
198 renew_client_locked(clp);
200 wake_up_all(&expiry_wq);
201 spin_unlock(&nn->client_lock);
204 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
208 if (is_session_dead(ses))
209 return nfserr_badsession;
210 status = get_client_locked(ses->se_client);
213 atomic_inc(&ses->se_ref);
217 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
219 struct nfs4_client *clp = ses->se_client;
220 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
222 lockdep_assert_held(&nn->client_lock);
224 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
226 put_client_renew_locked(clp);
229 static void nfsd4_put_session(struct nfsd4_session *ses)
231 struct nfs4_client *clp = ses->se_client;
232 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
234 spin_lock(&nn->client_lock);
235 nfsd4_put_session_locked(ses);
236 spin_unlock(&nn->client_lock);
239 static struct nfsd4_blocked_lock *
240 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
243 struct nfsd4_blocked_lock *cur, *found = NULL;
245 spin_lock(&nn->blocked_locks_lock);
246 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
247 if (fh_match(fh, &cur->nbl_fh)) {
248 list_del_init(&cur->nbl_list);
249 list_del_init(&cur->nbl_lru);
254 spin_unlock(&nn->blocked_locks_lock);
256 locks_delete_block(&found->nbl_lock);
260 static struct nfsd4_blocked_lock *
261 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
264 struct nfsd4_blocked_lock *nbl;
266 nbl = find_blocked_lock(lo, fh, nn);
268 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
270 INIT_LIST_HEAD(&nbl->nbl_list);
271 INIT_LIST_HEAD(&nbl->nbl_lru);
272 fh_copy_shallow(&nbl->nbl_fh, fh);
273 locks_init_lock(&nbl->nbl_lock);
274 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
275 &nfsd4_cb_notify_lock_ops,
276 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
283 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
285 locks_delete_block(&nbl->nbl_lock);
286 locks_release_private(&nbl->nbl_lock);
291 remove_blocked_locks(struct nfs4_lockowner *lo)
293 struct nfs4_client *clp = lo->lo_owner.so_client;
294 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
295 struct nfsd4_blocked_lock *nbl;
298 /* Dequeue all blocked locks */
299 spin_lock(&nn->blocked_locks_lock);
300 while (!list_empty(&lo->lo_blocked)) {
301 nbl = list_first_entry(&lo->lo_blocked,
302 struct nfsd4_blocked_lock,
304 list_del_init(&nbl->nbl_list);
305 list_move(&nbl->nbl_lru, &reaplist);
307 spin_unlock(&nn->blocked_locks_lock);
310 while (!list_empty(&reaplist)) {
311 nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
313 list_del_init(&nbl->nbl_lru);
314 free_blocked_lock(nbl);
319 nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
321 struct nfsd4_blocked_lock *nbl = container_of(cb,
322 struct nfsd4_blocked_lock, nbl_cb);
323 locks_delete_block(&nbl->nbl_lock);
327 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
330 * Since this is just an optimization, we don't try very hard if it
331 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
332 * just quit trying on anything else.
334 switch (task->tk_status) {
336 rpc_delay(task, 1 * HZ);
344 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
346 struct nfsd4_blocked_lock *nbl = container_of(cb,
347 struct nfsd4_blocked_lock, nbl_cb);
349 free_blocked_lock(nbl);
352 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
353 .prepare = nfsd4_cb_notify_lock_prepare,
354 .done = nfsd4_cb_notify_lock_done,
355 .release = nfsd4_cb_notify_lock_release,
358 static inline struct nfs4_stateowner *
359 nfs4_get_stateowner(struct nfs4_stateowner *sop)
361 atomic_inc(&sop->so_count);
366 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
368 return (sop->so_owner.len == owner->len) &&
369 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
372 static struct nfs4_openowner *
373 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
374 struct nfs4_client *clp)
376 struct nfs4_stateowner *so;
378 lockdep_assert_held(&clp->cl_lock);
380 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
382 if (!so->so_is_open_owner)
384 if (same_owner_str(so, &open->op_owner))
385 return openowner(nfs4_get_stateowner(so));
390 static struct nfs4_openowner *
391 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
392 struct nfs4_client *clp)
394 struct nfs4_openowner *oo;
396 spin_lock(&clp->cl_lock);
397 oo = find_openstateowner_str_locked(hashval, open, clp);
398 spin_unlock(&clp->cl_lock);
403 opaque_hashval(const void *ptr, int nbytes)
405 unsigned char *cptr = (unsigned char *) ptr;
415 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
417 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
419 kmem_cache_free(file_slab, fp);
423 put_nfs4_file(struct nfs4_file *fi)
425 might_lock(&state_lock);
427 if (refcount_dec_and_lock(&fi->fi_ref, &state_lock)) {
428 hlist_del_rcu(&fi->fi_hash);
429 spin_unlock(&state_lock);
430 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
431 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
432 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
436 static struct nfsd_file *
437 __nfs4_get_fd(struct nfs4_file *f, int oflag)
439 if (f->fi_fds[oflag])
440 return nfsd_file_get(f->fi_fds[oflag]);
444 static struct nfsd_file *
445 find_writeable_file_locked(struct nfs4_file *f)
447 struct nfsd_file *ret;
449 lockdep_assert_held(&f->fi_lock);
451 ret = __nfs4_get_fd(f, O_WRONLY);
453 ret = __nfs4_get_fd(f, O_RDWR);
457 static struct nfsd_file *
458 find_writeable_file(struct nfs4_file *f)
460 struct nfsd_file *ret;
462 spin_lock(&f->fi_lock);
463 ret = find_writeable_file_locked(f);
464 spin_unlock(&f->fi_lock);
469 static struct nfsd_file *
470 find_readable_file_locked(struct nfs4_file *f)
472 struct nfsd_file *ret;
474 lockdep_assert_held(&f->fi_lock);
476 ret = __nfs4_get_fd(f, O_RDONLY);
478 ret = __nfs4_get_fd(f, O_RDWR);
482 static struct nfsd_file *
483 find_readable_file(struct nfs4_file *f)
485 struct nfsd_file *ret;
487 spin_lock(&f->fi_lock);
488 ret = find_readable_file_locked(f);
489 spin_unlock(&f->fi_lock);
495 find_any_file(struct nfs4_file *f)
497 struct nfsd_file *ret;
501 spin_lock(&f->fi_lock);
502 ret = __nfs4_get_fd(f, O_RDWR);
504 ret = __nfs4_get_fd(f, O_WRONLY);
506 ret = __nfs4_get_fd(f, O_RDONLY);
508 spin_unlock(&f->fi_lock);
512 static atomic_long_t num_delegations;
513 unsigned long max_delegations;
516 * Open owner state (share locks)
519 /* hash tables for lock and open owners */
520 #define OWNER_HASH_BITS 8
521 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
522 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
524 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
528 ret = opaque_hashval(ownername->data, ownername->len);
529 return ret & OWNER_HASH_MASK;
532 /* hash table for nfs4_file */
533 #define FILE_HASH_BITS 8
534 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
536 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
538 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
541 static unsigned int file_hashval(struct knfsd_fh *fh)
543 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
546 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
549 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
551 lockdep_assert_held(&fp->fi_lock);
553 if (access & NFS4_SHARE_ACCESS_WRITE)
554 atomic_inc(&fp->fi_access[O_WRONLY]);
555 if (access & NFS4_SHARE_ACCESS_READ)
556 atomic_inc(&fp->fi_access[O_RDONLY]);
560 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
562 lockdep_assert_held(&fp->fi_lock);
564 /* Does this access mode make sense? */
565 if (access & ~NFS4_SHARE_ACCESS_BOTH)
568 /* Does it conflict with a deny mode already set? */
569 if ((access & fp->fi_share_deny) != 0)
570 return nfserr_share_denied;
572 __nfs4_file_get_access(fp, access);
576 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
578 /* Common case is that there is no deny mode. */
580 /* Does this deny mode make sense? */
581 if (deny & ~NFS4_SHARE_DENY_BOTH)
584 if ((deny & NFS4_SHARE_DENY_READ) &&
585 atomic_read(&fp->fi_access[O_RDONLY]))
586 return nfserr_share_denied;
588 if ((deny & NFS4_SHARE_DENY_WRITE) &&
589 atomic_read(&fp->fi_access[O_WRONLY]))
590 return nfserr_share_denied;
595 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
597 might_lock(&fp->fi_lock);
599 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
600 struct nfsd_file *f1 = NULL;
601 struct nfsd_file *f2 = NULL;
603 swap(f1, fp->fi_fds[oflag]);
604 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
605 swap(f2, fp->fi_fds[O_RDWR]);
606 spin_unlock(&fp->fi_lock);
614 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
616 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
618 if (access & NFS4_SHARE_ACCESS_WRITE)
619 __nfs4_file_put_access(fp, O_WRONLY);
620 if (access & NFS4_SHARE_ACCESS_READ)
621 __nfs4_file_put_access(fp, O_RDONLY);
625 * Allocate a new open/delegation state counter. This is needed for
626 * pNFS for proper return on close semantics.
628 * Note that we only allocate it for pNFS-enabled exports, otherwise
629 * all pointers to struct nfs4_clnt_odstate are always NULL.
631 static struct nfs4_clnt_odstate *
632 alloc_clnt_odstate(struct nfs4_client *clp)
634 struct nfs4_clnt_odstate *co;
636 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
639 refcount_set(&co->co_odcount, 1);
645 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
647 struct nfs4_file *fp = co->co_file;
649 lockdep_assert_held(&fp->fi_lock);
650 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
654 get_clnt_odstate(struct nfs4_clnt_odstate *co)
657 refcount_inc(&co->co_odcount);
661 put_clnt_odstate(struct nfs4_clnt_odstate *co)
663 struct nfs4_file *fp;
669 if (refcount_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
670 list_del(&co->co_perfile);
671 spin_unlock(&fp->fi_lock);
673 nfsd4_return_all_file_layouts(co->co_client, fp);
674 kmem_cache_free(odstate_slab, co);
678 static struct nfs4_clnt_odstate *
679 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
681 struct nfs4_clnt_odstate *co;
682 struct nfs4_client *cl;
689 spin_lock(&fp->fi_lock);
690 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
691 if (co->co_client == cl) {
692 get_clnt_odstate(co);
698 hash_clnt_odstate_locked(new);
700 spin_unlock(&fp->fi_lock);
704 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
705 void (*sc_free)(struct nfs4_stid *))
707 struct nfs4_stid *stid;
710 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
714 idr_preload(GFP_KERNEL);
715 spin_lock(&cl->cl_lock);
716 /* Reserving 0 for start of file in nfsdfs "states" file: */
717 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 1, 0, GFP_NOWAIT);
718 spin_unlock(&cl->cl_lock);
723 stid->sc_free = sc_free;
724 stid->sc_client = cl;
725 stid->sc_stateid.si_opaque.so_id = new_id;
726 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
727 /* Will be incremented before return to client: */
728 refcount_set(&stid->sc_count, 1);
729 spin_lock_init(&stid->sc_lock);
730 INIT_LIST_HEAD(&stid->sc_cp_list);
733 * It shouldn't be a problem to reuse an opaque stateid value.
734 * I don't think it is for 4.1. But with 4.0 I worry that, for
735 * example, a stray write retransmission could be accepted by
736 * the server when it should have been rejected. Therefore,
737 * adopt a trick from the sctp code to attempt to maximize the
738 * amount of time until an id is reused, by ensuring they always
739 * "increase" (mod INT_MAX):
743 kmem_cache_free(slab, stid);
748 * Create a unique stateid_t to represent each COPY.
750 static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
751 unsigned char sc_type)
755 stid->stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
756 stid->stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
757 stid->sc_type = sc_type;
759 idr_preload(GFP_KERNEL);
760 spin_lock(&nn->s2s_cp_lock);
761 new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, stid, 0, 0, GFP_NOWAIT);
762 stid->stid.si_opaque.so_id = new_id;
763 spin_unlock(&nn->s2s_cp_lock);
770 int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
772 return nfs4_init_cp_state(nn, ©->cp_stateid, NFS4_COPY_STID);
775 struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
776 struct nfs4_stid *p_stid)
778 struct nfs4_cpntf_state *cps;
780 cps = kzalloc(sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
783 cps->cpntf_time = ktime_get_boottime_seconds();
784 refcount_set(&cps->cp_stateid.sc_count, 1);
785 if (!nfs4_init_cp_state(nn, &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
787 spin_lock(&nn->s2s_cp_lock);
788 list_add(&cps->cp_list, &p_stid->sc_cp_list);
789 spin_unlock(&nn->s2s_cp_lock);
796 void nfs4_free_copy_state(struct nfsd4_copy *copy)
800 WARN_ON_ONCE(copy->cp_stateid.sc_type != NFS4_COPY_STID);
801 nn = net_generic(copy->cp_clp->net, nfsd_net_id);
802 spin_lock(&nn->s2s_cp_lock);
803 idr_remove(&nn->s2s_cp_stateids,
804 copy->cp_stateid.stid.si_opaque.so_id);
805 spin_unlock(&nn->s2s_cp_lock);
808 static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
810 struct nfs4_cpntf_state *cps;
813 nn = net_generic(net, nfsd_net_id);
814 spin_lock(&nn->s2s_cp_lock);
815 while (!list_empty(&stid->sc_cp_list)) {
816 cps = list_first_entry(&stid->sc_cp_list,
817 struct nfs4_cpntf_state, cp_list);
818 _free_cpntf_state_locked(nn, cps);
820 spin_unlock(&nn->s2s_cp_lock);
823 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
825 struct nfs4_stid *stid;
827 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
831 return openlockstateid(stid);
834 static void nfs4_free_deleg(struct nfs4_stid *stid)
836 kmem_cache_free(deleg_slab, stid);
837 atomic_long_dec(&num_delegations);
841 * When we recall a delegation, we should be careful not to hand it
842 * out again straight away.
843 * To ensure this we keep a pair of bloom filters ('new' and 'old')
844 * in which the filehandles of recalled delegations are "stored".
845 * If a filehandle appear in either filter, a delegation is blocked.
846 * When a delegation is recalled, the filehandle is stored in the "new"
848 * Every 30 seconds we swap the filters and clear the "new" one,
849 * unless both are empty of course.
851 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
852 * low 3 bytes as hash-table indices.
854 * 'blocked_delegations_lock', which is always taken in block_delegations(),
855 * is used to manage concurrent access. Testing does not need the lock
856 * except when swapping the two filters.
858 static DEFINE_SPINLOCK(blocked_delegations_lock);
859 static struct bloom_pair {
860 int entries, old_entries;
862 int new; /* index into 'set' */
863 DECLARE_BITMAP(set[2], 256);
864 } blocked_delegations;
866 static int delegation_blocked(struct knfsd_fh *fh)
869 struct bloom_pair *bd = &blocked_delegations;
871 if (bd->entries == 0)
873 if (ktime_get_seconds() - bd->swap_time > 30) {
874 spin_lock(&blocked_delegations_lock);
875 if (ktime_get_seconds() - bd->swap_time > 30) {
876 bd->entries -= bd->old_entries;
877 bd->old_entries = bd->entries;
878 memset(bd->set[bd->new], 0,
881 bd->swap_time = ktime_get_seconds();
883 spin_unlock(&blocked_delegations_lock);
885 hash = jhash(&fh->fh_base, fh->fh_size, 0);
886 if (test_bit(hash&255, bd->set[0]) &&
887 test_bit((hash>>8)&255, bd->set[0]) &&
888 test_bit((hash>>16)&255, bd->set[0]))
891 if (test_bit(hash&255, bd->set[1]) &&
892 test_bit((hash>>8)&255, bd->set[1]) &&
893 test_bit((hash>>16)&255, bd->set[1]))
899 static void block_delegations(struct knfsd_fh *fh)
902 struct bloom_pair *bd = &blocked_delegations;
904 hash = jhash(&fh->fh_base, fh->fh_size, 0);
906 spin_lock(&blocked_delegations_lock);
907 __set_bit(hash&255, bd->set[bd->new]);
908 __set_bit((hash>>8)&255, bd->set[bd->new]);
909 __set_bit((hash>>16)&255, bd->set[bd->new]);
910 if (bd->entries == 0)
911 bd->swap_time = ktime_get_seconds();
913 spin_unlock(&blocked_delegations_lock);
916 static struct nfs4_delegation *
917 alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
918 struct svc_fh *current_fh,
919 struct nfs4_clnt_odstate *odstate)
921 struct nfs4_delegation *dp;
924 dprintk("NFSD alloc_init_deleg\n");
925 n = atomic_long_inc_return(&num_delegations);
926 if (n < 0 || n > max_delegations)
928 if (delegation_blocked(¤t_fh->fh_handle))
930 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
935 * delegation seqid's are never incremented. The 4.1 special
936 * meaning of seqid 0 isn't meaningful, really, but let's avoid
937 * 0 anyway just for consistency and use 1:
939 dp->dl_stid.sc_stateid.si_generation = 1;
940 INIT_LIST_HEAD(&dp->dl_perfile);
941 INIT_LIST_HEAD(&dp->dl_perclnt);
942 INIT_LIST_HEAD(&dp->dl_recall_lru);
943 dp->dl_clnt_odstate = odstate;
944 get_clnt_odstate(odstate);
945 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
947 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
948 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
950 dp->dl_stid.sc_file = fp;
953 atomic_long_dec(&num_delegations);
958 nfs4_put_stid(struct nfs4_stid *s)
960 struct nfs4_file *fp = s->sc_file;
961 struct nfs4_client *clp = s->sc_client;
963 might_lock(&clp->cl_lock);
965 if (!refcount_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
966 wake_up_all(&close_wq);
969 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
970 nfs4_free_cpntf_statelist(clp->net, s);
971 spin_unlock(&clp->cl_lock);
978 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
980 stateid_t *src = &stid->sc_stateid;
982 spin_lock(&stid->sc_lock);
983 if (unlikely(++src->si_generation == 0))
984 src->si_generation = 1;
985 memcpy(dst, src, sizeof(*dst));
986 spin_unlock(&stid->sc_lock);
989 static void put_deleg_file(struct nfs4_file *fp)
991 struct nfsd_file *nf = NULL;
993 spin_lock(&fp->fi_lock);
994 if (--fp->fi_delegees == 0)
995 swap(nf, fp->fi_deleg_file);
996 spin_unlock(&fp->fi_lock);
1002 static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1004 struct nfs4_file *fp = dp->dl_stid.sc_file;
1005 struct nfsd_file *nf = fp->fi_deleg_file;
1007 WARN_ON_ONCE(!fp->fi_delegees);
1009 vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1013 static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1015 put_clnt_odstate(dp->dl_clnt_odstate);
1016 nfs4_unlock_deleg_lease(dp);
1017 nfs4_put_stid(&dp->dl_stid);
1020 void nfs4_unhash_stid(struct nfs4_stid *s)
1026 * nfs4_delegation_exists - Discover if this delegation already exists
1027 * @clp: a pointer to the nfs4_client we're granting a delegation to
1028 * @fp: a pointer to the nfs4_file we're granting a delegation on
1031 * On success: true iff an existing delegation is found
1035 nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1037 struct nfs4_delegation *searchdp = NULL;
1038 struct nfs4_client *searchclp = NULL;
1040 lockdep_assert_held(&state_lock);
1041 lockdep_assert_held(&fp->fi_lock);
1043 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1044 searchclp = searchdp->dl_stid.sc_client;
1045 if (clp == searchclp) {
1053 * hash_delegation_locked - Add a delegation to the appropriate lists
1054 * @dp: a pointer to the nfs4_delegation we are adding.
1055 * @fp: a pointer to the nfs4_file we're granting a delegation on
1058 * On success: NULL if the delegation was successfully hashed.
1060 * On error: -EAGAIN if one was previously granted to this
1061 * nfs4_client for this nfs4_file. Delegation is not hashed.
1066 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1068 struct nfs4_client *clp = dp->dl_stid.sc_client;
1070 lockdep_assert_held(&state_lock);
1071 lockdep_assert_held(&fp->fi_lock);
1073 if (nfs4_delegation_exists(clp, fp))
1075 refcount_inc(&dp->dl_stid.sc_count);
1076 dp->dl_stid.sc_type = NFS4_DELEG_STID;
1077 list_add(&dp->dl_perfile, &fp->fi_delegations);
1078 list_add(&dp->dl_perclnt, &clp->cl_delegations);
1083 unhash_delegation_locked(struct nfs4_delegation *dp)
1085 struct nfs4_file *fp = dp->dl_stid.sc_file;
1087 lockdep_assert_held(&state_lock);
1089 if (list_empty(&dp->dl_perfile))
1092 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1093 /* Ensure that deleg break won't try to requeue it */
1095 spin_lock(&fp->fi_lock);
1096 list_del_init(&dp->dl_perclnt);
1097 list_del_init(&dp->dl_recall_lru);
1098 list_del_init(&dp->dl_perfile);
1099 spin_unlock(&fp->fi_lock);
1103 static void destroy_delegation(struct nfs4_delegation *dp)
1107 spin_lock(&state_lock);
1108 unhashed = unhash_delegation_locked(dp);
1109 spin_unlock(&state_lock);
1111 destroy_unhashed_deleg(dp);
1114 static void revoke_delegation(struct nfs4_delegation *dp)
1116 struct nfs4_client *clp = dp->dl_stid.sc_client;
1118 WARN_ON(!list_empty(&dp->dl_recall_lru));
1120 if (clp->cl_minorversion) {
1121 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1122 refcount_inc(&dp->dl_stid.sc_count);
1123 spin_lock(&clp->cl_lock);
1124 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
1125 spin_unlock(&clp->cl_lock);
1127 destroy_unhashed_deleg(dp);
1134 static unsigned int clientid_hashval(u32 id)
1136 return id & CLIENT_HASH_MASK;
1139 static unsigned int clientstr_hashval(struct xdr_netobj name)
1141 return opaque_hashval(name.data, 8) & CLIENT_HASH_MASK;
1145 * We store the NONE, READ, WRITE, and BOTH bits separately in the
1146 * st_{access,deny}_bmap field of the stateid, in order to track not
1147 * only what share bits are currently in force, but also what
1148 * combinations of share bits previous opens have used. This allows us
1149 * to enforce the recommendation of rfc 3530 14.2.19 that the server
1150 * return an error if the client attempt to downgrade to a combination
1151 * of share bits not explicable by closing some of its previous opens.
1153 * XXX: This enforcement is actually incomplete, since we don't keep
1154 * track of access/deny bit combinations; so, e.g., we allow:
1156 * OPEN allow read, deny write
1157 * OPEN allow both, deny none
1158 * DOWNGRADE allow read, deny none
1160 * which we should reject.
1163 bmap_to_share_mode(unsigned long bmap) {
1165 unsigned int access = 0;
1167 for (i = 1; i < 4; i++) {
1168 if (test_bit(i, &bmap))
1174 /* set share access for a given stateid */
1176 set_access(u32 access, struct nfs4_ol_stateid *stp)
1178 unsigned char mask = 1 << access;
1180 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1181 stp->st_access_bmap |= mask;
1184 /* clear share access for a given stateid */
1186 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1188 unsigned char mask = 1 << access;
1190 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1191 stp->st_access_bmap &= ~mask;
1194 /* test whether a given stateid has access */
1196 test_access(u32 access, struct nfs4_ol_stateid *stp)
1198 unsigned char mask = 1 << access;
1200 return (bool)(stp->st_access_bmap & mask);
1203 /* set share deny for a given stateid */
1205 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1207 unsigned char mask = 1 << deny;
1209 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1210 stp->st_deny_bmap |= mask;
1213 /* clear share deny for a given stateid */
1215 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1217 unsigned char mask = 1 << deny;
1219 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1220 stp->st_deny_bmap &= ~mask;
1223 /* test whether a given stateid is denying specific access */
1225 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1227 unsigned char mask = 1 << deny;
1229 return (bool)(stp->st_deny_bmap & mask);
1232 static int nfs4_access_to_omode(u32 access)
1234 switch (access & NFS4_SHARE_ACCESS_BOTH) {
1235 case NFS4_SHARE_ACCESS_READ:
1237 case NFS4_SHARE_ACCESS_WRITE:
1239 case NFS4_SHARE_ACCESS_BOTH:
1247 * A stateid that had a deny mode associated with it is being released
1248 * or downgraded. Recalculate the deny mode on the file.
1251 recalculate_deny_mode(struct nfs4_file *fp)
1253 struct nfs4_ol_stateid *stp;
1255 spin_lock(&fp->fi_lock);
1256 fp->fi_share_deny = 0;
1257 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1258 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1259 spin_unlock(&fp->fi_lock);
1263 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1266 bool change = false;
1268 for (i = 1; i < 4; i++) {
1269 if ((i & deny) != i) {
1275 /* Recalculate per-file deny mode if there was a change */
1277 recalculate_deny_mode(stp->st_stid.sc_file);
1280 /* release all access and file references for a given stateid */
1282 release_all_access(struct nfs4_ol_stateid *stp)
1285 struct nfs4_file *fp = stp->st_stid.sc_file;
1287 if (fp && stp->st_deny_bmap != 0)
1288 recalculate_deny_mode(fp);
1290 for (i = 1; i < 4; i++) {
1291 if (test_access(i, stp))
1292 nfs4_file_put_access(stp->st_stid.sc_file, i);
1293 clear_access(i, stp);
1297 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1299 kfree(sop->so_owner.data);
1300 sop->so_ops->so_free(sop);
1303 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1305 struct nfs4_client *clp = sop->so_client;
1307 might_lock(&clp->cl_lock);
1309 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1311 sop->so_ops->so_unhash(sop);
1312 spin_unlock(&clp->cl_lock);
1313 nfs4_free_stateowner(sop);
1317 nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1319 return list_empty(&stp->st_perfile);
1322 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1324 struct nfs4_file *fp = stp->st_stid.sc_file;
1326 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1328 if (list_empty(&stp->st_perfile))
1331 spin_lock(&fp->fi_lock);
1332 list_del_init(&stp->st_perfile);
1333 spin_unlock(&fp->fi_lock);
1334 list_del(&stp->st_perstateowner);
1338 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1340 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1342 put_clnt_odstate(stp->st_clnt_odstate);
1343 release_all_access(stp);
1344 if (stp->st_stateowner)
1345 nfs4_put_stateowner(stp->st_stateowner);
1346 kmem_cache_free(stateid_slab, stid);
1349 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1351 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1352 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1353 struct nfsd_file *nf;
1355 nf = find_any_file(stp->st_stid.sc_file);
1357 get_file(nf->nf_file);
1358 filp_close(nf->nf_file, (fl_owner_t)lo);
1361 nfs4_free_ol_stateid(stid);
1365 * Put the persistent reference to an already unhashed generic stateid, while
1366 * holding the cl_lock. If it's the last reference, then put it onto the
1367 * reaplist for later destruction.
1369 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1370 struct list_head *reaplist)
1372 struct nfs4_stid *s = &stp->st_stid;
1373 struct nfs4_client *clp = s->sc_client;
1375 lockdep_assert_held(&clp->cl_lock);
1377 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1379 if (!refcount_dec_and_test(&s->sc_count)) {
1380 wake_up_all(&close_wq);
1384 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1385 list_add(&stp->st_locks, reaplist);
1388 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1390 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1392 if (!unhash_ol_stateid(stp))
1394 list_del_init(&stp->st_locks);
1395 nfs4_unhash_stid(&stp->st_stid);
1399 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1401 struct nfs4_client *clp = stp->st_stid.sc_client;
1404 spin_lock(&clp->cl_lock);
1405 unhashed = unhash_lock_stateid(stp);
1406 spin_unlock(&clp->cl_lock);
1408 nfs4_put_stid(&stp->st_stid);
1411 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1413 struct nfs4_client *clp = lo->lo_owner.so_client;
1415 lockdep_assert_held(&clp->cl_lock);
1417 list_del_init(&lo->lo_owner.so_strhash);
1421 * Free a list of generic stateids that were collected earlier after being
1425 free_ol_stateid_reaplist(struct list_head *reaplist)
1427 struct nfs4_ol_stateid *stp;
1428 struct nfs4_file *fp;
1432 while (!list_empty(reaplist)) {
1433 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1435 list_del(&stp->st_locks);
1436 fp = stp->st_stid.sc_file;
1437 stp->st_stid.sc_free(&stp->st_stid);
1443 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1444 struct list_head *reaplist)
1446 struct nfs4_ol_stateid *stp;
1448 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1450 while (!list_empty(&open_stp->st_locks)) {
1451 stp = list_entry(open_stp->st_locks.next,
1452 struct nfs4_ol_stateid, st_locks);
1453 WARN_ON(!unhash_lock_stateid(stp));
1454 put_ol_stateid_locked(stp, reaplist);
1458 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1459 struct list_head *reaplist)
1461 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1463 if (!unhash_ol_stateid(stp))
1465 release_open_stateid_locks(stp, reaplist);
1469 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1471 LIST_HEAD(reaplist);
1473 spin_lock(&stp->st_stid.sc_client->cl_lock);
1474 if (unhash_open_stateid(stp, &reaplist))
1475 put_ol_stateid_locked(stp, &reaplist);
1476 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1477 free_ol_stateid_reaplist(&reaplist);
1480 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1482 struct nfs4_client *clp = oo->oo_owner.so_client;
1484 lockdep_assert_held(&clp->cl_lock);
1486 list_del_init(&oo->oo_owner.so_strhash);
1487 list_del_init(&oo->oo_perclient);
1490 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1492 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1494 struct nfs4_ol_stateid *s;
1496 spin_lock(&nn->client_lock);
1497 s = oo->oo_last_closed_stid;
1499 list_del_init(&oo->oo_close_lru);
1500 oo->oo_last_closed_stid = NULL;
1502 spin_unlock(&nn->client_lock);
1504 nfs4_put_stid(&s->st_stid);
1507 static void release_openowner(struct nfs4_openowner *oo)
1509 struct nfs4_ol_stateid *stp;
1510 struct nfs4_client *clp = oo->oo_owner.so_client;
1511 struct list_head reaplist;
1513 INIT_LIST_HEAD(&reaplist);
1515 spin_lock(&clp->cl_lock);
1516 unhash_openowner_locked(oo);
1517 while (!list_empty(&oo->oo_owner.so_stateids)) {
1518 stp = list_first_entry(&oo->oo_owner.so_stateids,
1519 struct nfs4_ol_stateid, st_perstateowner);
1520 if (unhash_open_stateid(stp, &reaplist))
1521 put_ol_stateid_locked(stp, &reaplist);
1523 spin_unlock(&clp->cl_lock);
1524 free_ol_stateid_reaplist(&reaplist);
1525 release_last_closed_stateid(oo);
1526 nfs4_put_stateowner(&oo->oo_owner);
1530 hash_sessionid(struct nfs4_sessionid *sessionid)
1532 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1534 return sid->sequence % SESSION_HASH_SIZE;
1537 #ifdef CONFIG_SUNRPC_DEBUG
1539 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1541 u32 *ptr = (u32 *)(&sessionid->data[0]);
1542 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1546 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1552 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1553 * won't be used for replay.
1555 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1557 struct nfs4_stateowner *so = cstate->replay_owner;
1559 if (nfserr == nfserr_replay_me)
1562 if (!seqid_mutating_err(ntohl(nfserr))) {
1563 nfsd4_cstate_clear_replay(cstate);
1568 if (so->so_is_open_owner)
1569 release_last_closed_stateid(openowner(so));
1575 gen_sessionid(struct nfsd4_session *ses)
1577 struct nfs4_client *clp = ses->se_client;
1578 struct nfsd4_sessionid *sid;
1580 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1581 sid->clientid = clp->cl_clientid;
1582 sid->sequence = current_sessionid++;
1587 * The protocol defines ca_maxresponssize_cached to include the size of
1588 * the rpc header, but all we need to cache is the data starting after
1589 * the end of the initial SEQUENCE operation--the rest we regenerate
1590 * each time. Therefore we can advertise a ca_maxresponssize_cached
1591 * value that is the number of bytes in our cache plus a few additional
1592 * bytes. In order to stay on the safe side, and not promise more than
1593 * we can cache, those additional bytes must be the minimum possible: 24
1594 * bytes of rpc header (xid through accept state, with AUTH_NULL
1595 * verifier), 12 for the compound header (with zero-length tag), and 44
1596 * for the SEQUENCE op response:
1598 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1601 free_session_slots(struct nfsd4_session *ses)
1605 for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1606 free_svc_cred(&ses->se_slots[i]->sl_cred);
1607 kfree(ses->se_slots[i]);
1612 * We don't actually need to cache the rpc and session headers, so we
1613 * can allocate a little less for each slot:
1615 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1619 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1622 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1623 return size + sizeof(struct nfsd4_slot);
1627 * XXX: If we run out of reserved DRC memory we could (up to a point)
1628 * re-negotiate active sessions and reduce their slot usage to make
1629 * room for new connections. For now we just fail the create session.
1631 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1633 u32 slotsize = slot_bytes(ca);
1634 u32 num = ca->maxreqs;
1635 unsigned long avail, total_avail;
1636 unsigned int scale_factor;
1638 spin_lock(&nfsd_drc_lock);
1639 if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1640 total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1642 /* We have handed out more space than we chose in
1643 * set_max_drc() to allow. That isn't really a
1644 * problem as long as that doesn't make us think we
1645 * have lots more due to integer overflow.
1648 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1650 * Never use more than a fraction of the remaining memory,
1651 * unless it's the only way to give this client a slot.
1652 * The chosen fraction is either 1/8 or 1/number of threads,
1653 * whichever is smaller. This ensures there are adequate
1654 * slots to support multiple clients per thread.
1655 * Give the client one slot even if that would require
1656 * over-allocation--it is better than failure.
1658 scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1660 avail = clamp_t(unsigned long, avail, slotsize,
1661 total_avail/scale_factor);
1662 num = min_t(int, num, avail / slotsize);
1663 num = max_t(int, num, 1);
1664 nfsd_drc_mem_used += num * slotsize;
1665 spin_unlock(&nfsd_drc_lock);
1670 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1672 int slotsize = slot_bytes(ca);
1674 spin_lock(&nfsd_drc_lock);
1675 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1676 spin_unlock(&nfsd_drc_lock);
1679 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1680 struct nfsd4_channel_attrs *battrs)
1682 int numslots = fattrs->maxreqs;
1683 int slotsize = slot_bytes(fattrs);
1684 struct nfsd4_session *new;
1687 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1688 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1689 mem = numslots * sizeof(struct nfsd4_slot *);
1691 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1694 /* allocate each struct nfsd4_slot and data cache in one piece */
1695 for (i = 0; i < numslots; i++) {
1696 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1697 if (!new->se_slots[i])
1701 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1702 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1707 kfree(new->se_slots[i]);
1712 static void free_conn(struct nfsd4_conn *c)
1714 svc_xprt_put(c->cn_xprt);
1718 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1720 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1721 struct nfs4_client *clp = c->cn_session->se_client;
1723 spin_lock(&clp->cl_lock);
1724 if (!list_empty(&c->cn_persession)) {
1725 list_del(&c->cn_persession);
1728 nfsd4_probe_callback(clp);
1729 spin_unlock(&clp->cl_lock);
1732 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1734 struct nfsd4_conn *conn;
1736 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1739 svc_xprt_get(rqstp->rq_xprt);
1740 conn->cn_xprt = rqstp->rq_xprt;
1741 conn->cn_flags = flags;
1742 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1746 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1748 conn->cn_session = ses;
1749 list_add(&conn->cn_persession, &ses->se_conns);
1752 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1754 struct nfs4_client *clp = ses->se_client;
1756 spin_lock(&clp->cl_lock);
1757 __nfsd4_hash_conn(conn, ses);
1758 spin_unlock(&clp->cl_lock);
1761 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1763 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1764 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1767 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1771 nfsd4_hash_conn(conn, ses);
1772 ret = nfsd4_register_conn(conn);
1774 /* oops; xprt is already down: */
1775 nfsd4_conn_lost(&conn->cn_xpt_user);
1776 /* We may have gained or lost a callback channel: */
1777 nfsd4_probe_callback_sync(ses->se_client);
1780 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1782 u32 dir = NFS4_CDFC4_FORE;
1784 if (cses->flags & SESSION4_BACK_CHAN)
1785 dir |= NFS4_CDFC4_BACK;
1786 return alloc_conn(rqstp, dir);
1789 /* must be called under client_lock */
1790 static void nfsd4_del_conns(struct nfsd4_session *s)
1792 struct nfs4_client *clp = s->se_client;
1793 struct nfsd4_conn *c;
1795 spin_lock(&clp->cl_lock);
1796 while (!list_empty(&s->se_conns)) {
1797 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1798 list_del_init(&c->cn_persession);
1799 spin_unlock(&clp->cl_lock);
1801 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1804 spin_lock(&clp->cl_lock);
1806 spin_unlock(&clp->cl_lock);
1809 static void __free_session(struct nfsd4_session *ses)
1811 free_session_slots(ses);
1815 static void free_session(struct nfsd4_session *ses)
1817 nfsd4_del_conns(ses);
1818 nfsd4_put_drc_mem(&ses->se_fchannel);
1819 __free_session(ses);
1822 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1825 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1827 new->se_client = clp;
1830 INIT_LIST_HEAD(&new->se_conns);
1832 new->se_cb_seq_nr = 1;
1833 new->se_flags = cses->flags;
1834 new->se_cb_prog = cses->callback_prog;
1835 new->se_cb_sec = cses->cb_sec;
1836 atomic_set(&new->se_ref, 0);
1837 idx = hash_sessionid(&new->se_sessionid);
1838 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1839 spin_lock(&clp->cl_lock);
1840 list_add(&new->se_perclnt, &clp->cl_sessions);
1841 spin_unlock(&clp->cl_lock);
1844 struct sockaddr *sa = svc_addr(rqstp);
1846 * This is a little silly; with sessions there's no real
1847 * use for the callback address. Use the peer address
1848 * as a reasonable default for now, but consider fixing
1849 * the rpc client not to require an address in the
1852 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1853 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1857 /* caller must hold client_lock */
1858 static struct nfsd4_session *
1859 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1861 struct nfsd4_session *elem;
1863 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1865 lockdep_assert_held(&nn->client_lock);
1867 dump_sessionid(__func__, sessionid);
1868 idx = hash_sessionid(sessionid);
1869 /* Search in the appropriate list */
1870 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1871 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1872 NFS4_MAX_SESSIONID_LEN)) {
1877 dprintk("%s: session not found\n", __func__);
1881 static struct nfsd4_session *
1882 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1885 struct nfsd4_session *session;
1886 __be32 status = nfserr_badsession;
1888 session = __find_in_sessionid_hashtbl(sessionid, net);
1891 status = nfsd4_get_session_locked(session);
1899 /* caller must hold client_lock */
1901 unhash_session(struct nfsd4_session *ses)
1903 struct nfs4_client *clp = ses->se_client;
1904 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1906 lockdep_assert_held(&nn->client_lock);
1908 list_del(&ses->se_hash);
1909 spin_lock(&ses->se_client->cl_lock);
1910 list_del(&ses->se_perclnt);
1911 spin_unlock(&ses->se_client->cl_lock);
1914 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1916 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1919 * We're assuming the clid was not given out from a boot
1920 * precisely 2^32 (about 136 years) before this one. That seems
1921 * a safe assumption:
1923 if (clid->cl_boot == (u32)nn->boot_time)
1925 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08llx\n",
1926 clid->cl_boot, clid->cl_id, nn->boot_time);
1931 * XXX Should we use a slab cache ?
1932 * This type of memory management is somewhat inefficient, but we use it
1933 * anyway since SETCLIENTID is not a common operation.
1935 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1937 struct nfs4_client *clp;
1940 clp = kmem_cache_zalloc(client_slab, GFP_KERNEL);
1943 xdr_netobj_dup(&clp->cl_name, &name, GFP_KERNEL);
1944 if (clp->cl_name.data == NULL)
1946 clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
1947 sizeof(struct list_head),
1949 if (!clp->cl_ownerstr_hashtbl)
1950 goto err_no_hashtbl;
1951 for (i = 0; i < OWNER_HASH_SIZE; i++)
1952 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1953 INIT_LIST_HEAD(&clp->cl_sessions);
1954 idr_init(&clp->cl_stateids);
1955 atomic_set(&clp->cl_rpc_users, 0);
1956 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1957 INIT_LIST_HEAD(&clp->cl_idhash);
1958 INIT_LIST_HEAD(&clp->cl_openowners);
1959 INIT_LIST_HEAD(&clp->cl_delegations);
1960 INIT_LIST_HEAD(&clp->cl_lru);
1961 INIT_LIST_HEAD(&clp->cl_revoked);
1962 #ifdef CONFIG_NFSD_PNFS
1963 INIT_LIST_HEAD(&clp->cl_lo_states);
1965 INIT_LIST_HEAD(&clp->async_copies);
1966 spin_lock_init(&clp->async_lock);
1967 spin_lock_init(&clp->cl_lock);
1968 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1971 kfree(clp->cl_name.data);
1973 kmem_cache_free(client_slab, clp);
1977 static void __free_client(struct kref *k)
1979 struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
1980 struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
1982 free_svc_cred(&clp->cl_cred);
1983 kfree(clp->cl_ownerstr_hashtbl);
1984 kfree(clp->cl_name.data);
1985 kfree(clp->cl_nii_domain.data);
1986 kfree(clp->cl_nii_name.data);
1987 idr_destroy(&clp->cl_stateids);
1988 kmem_cache_free(client_slab, clp);
1991 static void drop_client(struct nfs4_client *clp)
1993 kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
1997 free_client(struct nfs4_client *clp)
1999 while (!list_empty(&clp->cl_sessions)) {
2000 struct nfsd4_session *ses;
2001 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2003 list_del(&ses->se_perclnt);
2004 WARN_ON_ONCE(atomic_read(&ses->se_ref));
2007 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2008 if (clp->cl_nfsd_dentry) {
2009 nfsd_client_rmdir(clp->cl_nfsd_dentry);
2010 clp->cl_nfsd_dentry = NULL;
2011 wake_up_all(&expiry_wq);
2016 /* must be called under the client_lock */
2018 unhash_client_locked(struct nfs4_client *clp)
2020 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2021 struct nfsd4_session *ses;
2023 lockdep_assert_held(&nn->client_lock);
2025 /* Mark the client as expired! */
2027 /* Make it invisible */
2028 if (!list_empty(&clp->cl_idhash)) {
2029 list_del_init(&clp->cl_idhash);
2030 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2031 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2033 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2035 list_del_init(&clp->cl_lru);
2036 spin_lock(&clp->cl_lock);
2037 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2038 list_del_init(&ses->se_hash);
2039 spin_unlock(&clp->cl_lock);
2043 unhash_client(struct nfs4_client *clp)
2045 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2047 spin_lock(&nn->client_lock);
2048 unhash_client_locked(clp);
2049 spin_unlock(&nn->client_lock);
2052 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2054 if (atomic_read(&clp->cl_rpc_users))
2055 return nfserr_jukebox;
2056 unhash_client_locked(clp);
2061 __destroy_client(struct nfs4_client *clp)
2064 struct nfs4_openowner *oo;
2065 struct nfs4_delegation *dp;
2066 struct list_head reaplist;
2068 INIT_LIST_HEAD(&reaplist);
2069 spin_lock(&state_lock);
2070 while (!list_empty(&clp->cl_delegations)) {
2071 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2072 WARN_ON(!unhash_delegation_locked(dp));
2073 list_add(&dp->dl_recall_lru, &reaplist);
2075 spin_unlock(&state_lock);
2076 while (!list_empty(&reaplist)) {
2077 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2078 list_del_init(&dp->dl_recall_lru);
2079 destroy_unhashed_deleg(dp);
2081 while (!list_empty(&clp->cl_revoked)) {
2082 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2083 list_del_init(&dp->dl_recall_lru);
2084 nfs4_put_stid(&dp->dl_stid);
2086 while (!list_empty(&clp->cl_openowners)) {
2087 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2088 nfs4_get_stateowner(&oo->oo_owner);
2089 release_openowner(oo);
2091 for (i = 0; i < OWNER_HASH_SIZE; i++) {
2092 struct nfs4_stateowner *so, *tmp;
2094 list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2096 /* Should be no openowners at this point */
2097 WARN_ON_ONCE(so->so_is_open_owner);
2098 remove_blocked_locks(lockowner(so));
2101 nfsd4_return_all_client_layouts(clp);
2102 nfsd4_shutdown_copy(clp);
2103 nfsd4_shutdown_callback(clp);
2104 if (clp->cl_cb_conn.cb_xprt)
2105 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
2107 wake_up_all(&expiry_wq);
2111 destroy_client(struct nfs4_client *clp)
2114 __destroy_client(clp);
2117 static void inc_reclaim_complete(struct nfs4_client *clp)
2119 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2121 if (!nn->track_reclaim_completes)
2123 if (!nfsd4_find_reclaim_client(clp->cl_name, nn))
2125 if (atomic_inc_return(&nn->nr_reclaim_complete) ==
2126 nn->reclaim_str_hashtbl_size) {
2127 printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2129 nfsd4_end_grace(nn);
2133 static void expire_client(struct nfs4_client *clp)
2136 nfsd4_client_record_remove(clp);
2137 __destroy_client(clp);
2140 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2142 memcpy(target->cl_verifier.data, source->data,
2143 sizeof(target->cl_verifier.data));
2146 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2148 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2149 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2152 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2154 target->cr_principal = kstrdup(source->cr_principal, GFP_KERNEL);
2155 target->cr_raw_principal = kstrdup(source->cr_raw_principal,
2157 target->cr_targ_princ = kstrdup(source->cr_targ_princ, GFP_KERNEL);
2158 if ((source->cr_principal && !target->cr_principal) ||
2159 (source->cr_raw_principal && !target->cr_raw_principal) ||
2160 (source->cr_targ_princ && !target->cr_targ_princ))
2163 target->cr_flavor = source->cr_flavor;
2164 target->cr_uid = source->cr_uid;
2165 target->cr_gid = source->cr_gid;
2166 target->cr_group_info = source->cr_group_info;
2167 get_group_info(target->cr_group_info);
2168 target->cr_gss_mech = source->cr_gss_mech;
2169 if (source->cr_gss_mech)
2170 gss_mech_get(source->cr_gss_mech);
2175 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2177 if (o1->len < o2->len)
2179 if (o1->len > o2->len)
2181 return memcmp(o1->data, o2->data, o1->len);
2185 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2187 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
2191 same_clid(clientid_t *cl1, clientid_t *cl2)
2193 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2196 static bool groups_equal(struct group_info *g1, struct group_info *g2)
2200 if (g1->ngroups != g2->ngroups)
2202 for (i=0; i<g1->ngroups; i++)
2203 if (!gid_eq(g1->gid[i], g2->gid[i]))
2209 * RFC 3530 language requires clid_inuse be returned when the
2210 * "principal" associated with a requests differs from that previously
2211 * used. We use uid, gid's, and gss principal string as our best
2212 * approximation. We also don't want to allow non-gss use of a client
2213 * established using gss: in theory cr_principal should catch that
2214 * change, but in practice cr_principal can be null even in the gss case
2215 * since gssd doesn't always pass down a principal string.
2217 static bool is_gss_cred(struct svc_cred *cr)
2219 /* Is cr_flavor one of the gss "pseudoflavors"?: */
2220 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2225 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2227 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2228 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2229 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2230 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2232 /* XXX: check that cr_targ_princ fields match ? */
2233 if (cr1->cr_principal == cr2->cr_principal)
2235 if (!cr1->cr_principal || !cr2->cr_principal)
2237 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2240 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2242 struct svc_cred *cr = &rqstp->rq_cred;
2245 if (!cr->cr_gss_mech)
2247 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2248 return service == RPC_GSS_SVC_INTEGRITY ||
2249 service == RPC_GSS_SVC_PRIVACY;
2252 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2254 struct svc_cred *cr = &rqstp->rq_cred;
2256 if (!cl->cl_mach_cred)
2258 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2260 if (!svc_rqst_integrity_protected(rqstp))
2262 if (cl->cl_cred.cr_raw_principal)
2263 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2264 cr->cr_raw_principal);
2265 if (!cr->cr_principal)
2267 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2270 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2275 * This is opaque to client, so no need to byte-swap. Use
2276 * __force to keep sparse happy
2278 verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2279 verf[1] = (__force __be32)nn->clverifier_counter++;
2280 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2283 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2285 clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2286 clp->cl_clientid.cl_id = nn->clientid_counter++;
2287 gen_confirm(clp, nn);
2290 static struct nfs4_stid *
2291 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2293 struct nfs4_stid *ret;
2295 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2296 if (!ret || !ret->sc_type)
2301 static struct nfs4_stid *
2302 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2304 struct nfs4_stid *s;
2306 spin_lock(&cl->cl_lock);
2307 s = find_stateid_locked(cl, t);
2309 if (typemask & s->sc_type)
2310 refcount_inc(&s->sc_count);
2314 spin_unlock(&cl->cl_lock);
2318 static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2320 struct nfsdfs_client *nc;
2321 nc = get_nfsdfs_client(inode);
2324 return container_of(nc, struct nfs4_client, cl_nfsdfs);
2327 static void seq_quote_mem(struct seq_file *m, char *data, int len)
2329 seq_printf(m, "\"");
2330 seq_escape_mem_ascii(m, data, len);
2331 seq_printf(m, "\"");
2334 static int client_info_show(struct seq_file *m, void *v)
2336 struct inode *inode = m->private;
2337 struct nfs4_client *clp;
2340 clp = get_nfsdfs_clp(inode);
2343 memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2344 seq_printf(m, "clientid: 0x%llx\n", clid);
2345 seq_printf(m, "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2346 seq_printf(m, "name: ");
2347 seq_quote_mem(m, clp->cl_name.data, clp->cl_name.len);
2348 seq_printf(m, "\nminor version: %d\n", clp->cl_minorversion);
2349 if (clp->cl_nii_domain.data) {
2350 seq_printf(m, "Implementation domain: ");
2351 seq_quote_mem(m, clp->cl_nii_domain.data,
2352 clp->cl_nii_domain.len);
2353 seq_printf(m, "\nImplementation name: ");
2354 seq_quote_mem(m, clp->cl_nii_name.data, clp->cl_nii_name.len);
2355 seq_printf(m, "\nImplementation time: [%lld, %ld]\n",
2356 clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2363 static int client_info_open(struct inode *inode, struct file *file)
2365 return single_open(file, client_info_show, inode);
2368 static const struct file_operations client_info_fops = {
2369 .open = client_info_open,
2371 .llseek = seq_lseek,
2372 .release = single_release,
2375 static void *states_start(struct seq_file *s, loff_t *pos)
2376 __acquires(&clp->cl_lock)
2378 struct nfs4_client *clp = s->private;
2379 unsigned long id = *pos;
2382 spin_lock(&clp->cl_lock);
2383 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2388 static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2390 struct nfs4_client *clp = s->private;
2391 unsigned long id = *pos;
2396 ret = idr_get_next_ul(&clp->cl_stateids, &id);
2401 static void states_stop(struct seq_file *s, void *v)
2402 __releases(&clp->cl_lock)
2404 struct nfs4_client *clp = s->private;
2406 spin_unlock(&clp->cl_lock);
2409 static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2411 struct inode *inode = f->nf_inode;
2413 seq_printf(s, "superblock: \"%02x:%02x:%ld\"",
2414 MAJOR(inode->i_sb->s_dev),
2415 MINOR(inode->i_sb->s_dev),
2419 static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2421 seq_printf(s, "owner: ");
2422 seq_quote_mem(s, oo->so_owner.data, oo->so_owner.len);
2425 static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2427 struct nfs4_ol_stateid *ols;
2428 struct nfs4_file *nf;
2429 struct nfsd_file *file;
2430 struct nfs4_stateowner *oo;
2431 unsigned int access, deny;
2433 if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2434 return 0; /* XXX: or SEQ_SKIP? */
2435 ols = openlockstateid(st);
2436 oo = ols->st_stateowner;
2438 file = find_any_file(nf);
2440 seq_printf(s, "- 0x%16phN: { type: open, ", &st->sc_stateid);
2442 access = bmap_to_share_mode(ols->st_access_bmap);
2443 deny = bmap_to_share_mode(ols->st_deny_bmap);
2445 seq_printf(s, "access: %s%s, ",
2446 access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2447 access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2448 seq_printf(s, "deny: %s%s, ",
2449 deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2450 deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2452 nfs4_show_superblock(s, file);
2453 seq_printf(s, ", ");
2454 nfs4_show_owner(s, oo);
2455 seq_printf(s, " }\n");
2456 nfsd_file_put(file);
2461 static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2463 struct nfs4_ol_stateid *ols;
2464 struct nfs4_file *nf;
2465 struct nfsd_file *file;
2466 struct nfs4_stateowner *oo;
2468 ols = openlockstateid(st);
2469 oo = ols->st_stateowner;
2471 file = find_any_file(nf);
2473 seq_printf(s, "- 0x%16phN: { type: lock, ", &st->sc_stateid);
2476 * Note: a lock stateid isn't really the same thing as a lock,
2477 * it's the locking state held by one owner on a file, and there
2478 * may be multiple (or no) lock ranges associated with it.
2479 * (Same for the matter is true of open stateids.)
2482 nfs4_show_superblock(s, file);
2483 /* XXX: open stateid? */
2484 seq_printf(s, ", ");
2485 nfs4_show_owner(s, oo);
2486 seq_printf(s, " }\n");
2487 nfsd_file_put(file);
2492 static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2494 struct nfs4_delegation *ds;
2495 struct nfs4_file *nf;
2496 struct nfsd_file *file;
2498 ds = delegstateid(st);
2500 file = nf->fi_deleg_file;
2502 seq_printf(s, "- 0x%16phN: { type: deleg, ", &st->sc_stateid);
2504 /* Kinda dead code as long as we only support read delegs: */
2505 seq_printf(s, "access: %s, ",
2506 ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2508 /* XXX: lease time, whether it's being recalled. */
2510 nfs4_show_superblock(s, file);
2511 seq_printf(s, " }\n");
2516 static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2518 struct nfs4_layout_stateid *ls;
2519 struct nfsd_file *file;
2521 ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2524 seq_printf(s, "- 0x%16phN: { type: layout, ", &st->sc_stateid);
2526 /* XXX: What else would be useful? */
2528 nfs4_show_superblock(s, file);
2529 seq_printf(s, " }\n");
2534 static int states_show(struct seq_file *s, void *v)
2536 struct nfs4_stid *st = v;
2538 switch (st->sc_type) {
2539 case NFS4_OPEN_STID:
2540 return nfs4_show_open(s, st);
2541 case NFS4_LOCK_STID:
2542 return nfs4_show_lock(s, st);
2543 case NFS4_DELEG_STID:
2544 return nfs4_show_deleg(s, st);
2545 case NFS4_LAYOUT_STID:
2546 return nfs4_show_layout(s, st);
2548 return 0; /* XXX: or SEQ_SKIP? */
2550 /* XXX: copy stateids? */
2553 static struct seq_operations states_seq_ops = {
2554 .start = states_start,
2555 .next = states_next,
2556 .stop = states_stop,
2560 static int client_states_open(struct inode *inode, struct file *file)
2563 struct nfs4_client *clp;
2566 clp = get_nfsdfs_clp(inode);
2570 ret = seq_open(file, &states_seq_ops);
2573 s = file->private_data;
2578 static int client_opens_release(struct inode *inode, struct file *file)
2580 struct seq_file *m = file->private_data;
2581 struct nfs4_client *clp = m->private;
2583 /* XXX: alternatively, we could get/drop in seq start/stop */
2588 static const struct file_operations client_states_fops = {
2589 .open = client_states_open,
2591 .llseek = seq_lseek,
2592 .release = client_opens_release,
2596 * Normally we refuse to destroy clients that are in use, but here the
2597 * administrator is telling us to just do it. We also want to wait
2598 * so the caller has a guarantee that the client's locks are gone by
2599 * the time the write returns:
2601 static void force_expire_client(struct nfs4_client *clp)
2603 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2604 bool already_expired;
2606 spin_lock(&clp->cl_lock);
2608 spin_unlock(&clp->cl_lock);
2610 wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2611 spin_lock(&nn->client_lock);
2612 already_expired = list_empty(&clp->cl_lru);
2613 if (!already_expired)
2614 unhash_client_locked(clp);
2615 spin_unlock(&nn->client_lock);
2617 if (!already_expired)
2620 wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2623 static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2624 size_t size, loff_t *pos)
2627 struct nfs4_client *clp;
2629 data = simple_transaction_get(file, buf, size);
2631 return PTR_ERR(data);
2632 if (size != 7 || 0 != memcmp(data, "expire\n", 7))
2634 clp = get_nfsdfs_clp(file_inode(file));
2637 force_expire_client(clp);
2642 static const struct file_operations client_ctl_fops = {
2643 .write = client_ctl_write,
2644 .release = simple_transaction_release,
2647 static const struct tree_descr client_files[] = {
2648 [0] = {"info", &client_info_fops, S_IRUSR},
2649 [1] = {"states", &client_states_fops, S_IRUSR},
2650 [2] = {"ctl", &client_ctl_fops, S_IWUSR},
2654 static struct nfs4_client *create_client(struct xdr_netobj name,
2655 struct svc_rqst *rqstp, nfs4_verifier *verf)
2657 struct nfs4_client *clp;
2658 struct sockaddr *sa = svc_addr(rqstp);
2660 struct net *net = SVC_NET(rqstp);
2661 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2663 clp = alloc_client(name);
2667 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2673 kref_init(&clp->cl_nfsdfs.cl_ref);
2674 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2675 clp->cl_time = ktime_get_boottime_seconds();
2676 clear_bit(0, &clp->cl_cb_slot_busy);
2677 copy_verf(clp, verf);
2678 memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2679 clp->cl_cb_session = NULL;
2681 clp->cl_nfsd_dentry = nfsd_client_mkdir(nn, &clp->cl_nfsdfs,
2682 clp->cl_clientid.cl_id - nn->clientid_base,
2684 if (!clp->cl_nfsd_dentry) {
2692 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2694 struct rb_node **new = &(root->rb_node), *parent = NULL;
2695 struct nfs4_client *clp;
2698 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2701 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2702 new = &((*new)->rb_left);
2704 new = &((*new)->rb_right);
2707 rb_link_node(&new_clp->cl_namenode, parent, new);
2708 rb_insert_color(&new_clp->cl_namenode, root);
2711 static struct nfs4_client *
2712 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2715 struct rb_node *node = root->rb_node;
2716 struct nfs4_client *clp;
2719 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2720 cmp = compare_blob(&clp->cl_name, name);
2722 node = node->rb_left;
2724 node = node->rb_right;
2732 add_to_unconfirmed(struct nfs4_client *clp)
2734 unsigned int idhashval;
2735 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2737 lockdep_assert_held(&nn->client_lock);
2739 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2740 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2741 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2742 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2743 renew_client_locked(clp);
2747 move_to_confirmed(struct nfs4_client *clp)
2749 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2750 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2752 lockdep_assert_held(&nn->client_lock);
2754 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2755 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2756 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2757 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2758 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2759 renew_client_locked(clp);
2762 static struct nfs4_client *
2763 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2765 struct nfs4_client *clp;
2766 unsigned int idhashval = clientid_hashval(clid->cl_id);
2768 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2769 if (same_clid(&clp->cl_clientid, clid)) {
2770 if ((bool)clp->cl_minorversion != sessions)
2772 renew_client_locked(clp);
2779 static struct nfs4_client *
2780 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2782 struct list_head *tbl = nn->conf_id_hashtbl;
2784 lockdep_assert_held(&nn->client_lock);
2785 return find_client_in_id_table(tbl, clid, sessions);
2788 static struct nfs4_client *
2789 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2791 struct list_head *tbl = nn->unconf_id_hashtbl;
2793 lockdep_assert_held(&nn->client_lock);
2794 return find_client_in_id_table(tbl, clid, sessions);
2797 static bool clp_used_exchangeid(struct nfs4_client *clp)
2799 return clp->cl_exchange_flags != 0;
2802 static struct nfs4_client *
2803 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2805 lockdep_assert_held(&nn->client_lock);
2806 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2809 static struct nfs4_client *
2810 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2812 lockdep_assert_held(&nn->client_lock);
2813 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2817 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2819 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2820 struct sockaddr *sa = svc_addr(rqstp);
2821 u32 scopeid = rpc_get_scope_id(sa);
2822 unsigned short expected_family;
2824 /* Currently, we only support tcp and tcp6 for the callback channel */
2825 if (se->se_callback_netid_len == 3 &&
2826 !memcmp(se->se_callback_netid_val, "tcp", 3))
2827 expected_family = AF_INET;
2828 else if (se->se_callback_netid_len == 4 &&
2829 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2830 expected_family = AF_INET6;
2834 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2835 se->se_callback_addr_len,
2836 (struct sockaddr *)&conn->cb_addr,
2837 sizeof(conn->cb_addr));
2839 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2842 if (conn->cb_addr.ss_family == AF_INET6)
2843 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2845 conn->cb_prog = se->se_callback_prog;
2846 conn->cb_ident = se->se_callback_ident;
2847 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2850 conn->cb_addr.ss_family = AF_UNSPEC;
2851 conn->cb_addrlen = 0;
2852 dprintk("NFSD: this client (clientid %08x/%08x) "
2853 "will not receive delegations\n",
2854 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2860 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2863 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2865 struct xdr_buf *buf = resp->xdr.buf;
2866 struct nfsd4_slot *slot = resp->cstate.slot;
2869 dprintk("--> %s slot %p\n", __func__, slot);
2871 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2872 slot->sl_opcnt = resp->opcnt;
2873 slot->sl_status = resp->cstate.status;
2874 free_svc_cred(&slot->sl_cred);
2875 copy_cred(&slot->sl_cred, &resp->rqstp->rq_cred);
2877 if (!nfsd4_cache_this(resp)) {
2878 slot->sl_flags &= ~NFSD4_SLOT_CACHED;
2881 slot->sl_flags |= NFSD4_SLOT_CACHED;
2883 base = resp->cstate.data_offset;
2884 slot->sl_datalen = buf->len - base;
2885 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2886 WARN(1, "%s: sessions DRC could not cache compound\n",
2892 * Encode the replay sequence operation from the slot values.
2893 * If cachethis is FALSE encode the uncached rep error on the next
2894 * operation which sets resp->p and increments resp->opcnt for
2895 * nfs4svc_encode_compoundres.
2899 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2900 struct nfsd4_compoundres *resp)
2902 struct nfsd4_op *op;
2903 struct nfsd4_slot *slot = resp->cstate.slot;
2905 /* Encode the replayed sequence operation */
2906 op = &args->ops[resp->opcnt - 1];
2907 nfsd4_encode_operation(resp, op);
2909 if (slot->sl_flags & NFSD4_SLOT_CACHED)
2911 if (args->opcnt == 1) {
2913 * The original operation wasn't a solo sequence--we
2914 * always cache those--so this retry must not match the
2917 op->status = nfserr_seq_false_retry;
2919 op = &args->ops[resp->opcnt++];
2920 op->status = nfserr_retry_uncached_rep;
2921 nfsd4_encode_operation(resp, op);
2927 * The sequence operation is not cached because we can use the slot and
2931 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2932 struct nfsd4_sequence *seq)
2934 struct nfsd4_slot *slot = resp->cstate.slot;
2935 struct xdr_stream *xdr = &resp->xdr;
2939 dprintk("--> %s slot %p\n", __func__, slot);
2941 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2945 p = xdr_reserve_space(xdr, slot->sl_datalen);
2948 return nfserr_serverfault;
2950 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2951 xdr_commit_encode(xdr);
2953 resp->opcnt = slot->sl_opcnt;
2954 return slot->sl_status;
2958 * Set the exchange_id flags returned by the server.
2961 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2963 #ifdef CONFIG_NFSD_PNFS
2964 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2966 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2969 /* Referrals are supported, Migration is not. */
2970 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2972 /* set the wire flags to return to client. */
2973 clid->flags = new->cl_exchange_flags;
2976 static bool client_has_openowners(struct nfs4_client *clp)
2978 struct nfs4_openowner *oo;
2980 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2981 if (!list_empty(&oo->oo_owner.so_stateids))
2987 static bool client_has_state(struct nfs4_client *clp)
2989 return client_has_openowners(clp)
2990 #ifdef CONFIG_NFSD_PNFS
2991 || !list_empty(&clp->cl_lo_states)
2993 || !list_empty(&clp->cl_delegations)
2994 || !list_empty(&clp->cl_sessions)
2995 || !list_empty(&clp->async_copies);
2998 static __be32 copy_impl_id(struct nfs4_client *clp,
2999 struct nfsd4_exchange_id *exid)
3001 if (!exid->nii_domain.data)
3003 xdr_netobj_dup(&clp->cl_nii_domain, &exid->nii_domain, GFP_KERNEL);
3004 if (!clp->cl_nii_domain.data)
3005 return nfserr_jukebox;
3006 xdr_netobj_dup(&clp->cl_nii_name, &exid->nii_name, GFP_KERNEL);
3007 if (!clp->cl_nii_name.data)
3008 return nfserr_jukebox;
3009 clp->cl_nii_time = exid->nii_time;
3014 nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3015 union nfsd4_op_u *u)
3017 struct nfsd4_exchange_id *exid = &u->exchange_id;
3018 struct nfs4_client *conf, *new;
3019 struct nfs4_client *unconf = NULL;
3021 char addr_str[INET6_ADDRSTRLEN];
3022 nfs4_verifier verf = exid->verifier;
3023 struct sockaddr *sa = svc_addr(rqstp);
3024 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3025 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3027 rpc_ntop(sa, addr_str, sizeof(addr_str));
3028 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3029 "ip_addr=%s flags %x, spa_how %d\n",
3030 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
3031 addr_str, exid->flags, exid->spa_how);
3033 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3034 return nfserr_inval;
3036 new = create_client(exid->clname, rqstp, &verf);
3038 return nfserr_jukebox;
3039 status = copy_impl_id(new, exid);
3043 switch (exid->spa_how) {
3045 exid->spo_must_enforce[0] = 0;
3046 exid->spo_must_enforce[1] = (
3047 1 << (OP_BIND_CONN_TO_SESSION - 32) |
3048 1 << (OP_EXCHANGE_ID - 32) |
3049 1 << (OP_CREATE_SESSION - 32) |
3050 1 << (OP_DESTROY_SESSION - 32) |
3051 1 << (OP_DESTROY_CLIENTID - 32));
3053 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3054 1 << (OP_OPEN_DOWNGRADE) |
3056 1 << (OP_DELEGRETURN));
3058 exid->spo_must_allow[1] &= (
3059 1 << (OP_TEST_STATEID - 32) |
3060 1 << (OP_FREE_STATEID - 32));
3061 if (!svc_rqst_integrity_protected(rqstp)) {
3062 status = nfserr_inval;
3066 * Sometimes userspace doesn't give us a principal.
3067 * Which is a bug, really. Anyway, we can't enforce
3068 * MACH_CRED in that case, better to give up now:
3070 if (!new->cl_cred.cr_principal &&
3071 !new->cl_cred.cr_raw_principal) {
3072 status = nfserr_serverfault;
3075 new->cl_mach_cred = true;
3078 default: /* checked by xdr code */
3082 status = nfserr_encr_alg_unsupp;
3086 /* Cases below refer to rfc 5661 section 18.35.4: */
3087 spin_lock(&nn->client_lock);
3088 conf = find_confirmed_client_by_name(&exid->clname, nn);
3090 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
3091 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
3094 if (!clp_used_exchangeid(conf)) { /* buggy client */
3095 status = nfserr_inval;
3098 if (!nfsd4_mach_creds_match(conf, rqstp)) {
3099 status = nfserr_wrong_cred;
3102 if (!creds_match) { /* case 9 */
3103 status = nfserr_perm;
3106 if (!verfs_match) { /* case 8 */
3107 status = nfserr_not_same;
3111 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3114 if (!creds_match) { /* case 3 */
3115 if (client_has_state(conf)) {
3116 status = nfserr_clid_inuse;
3121 if (verfs_match) { /* case 2 */
3122 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3125 /* case 5, client reboot */
3130 if (update) { /* case 7 */
3131 status = nfserr_noent;
3135 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
3136 if (unconf) /* case 4, possible retry or client restart */
3137 unhash_client_locked(unconf);
3139 /* case 1 (normal case) */
3142 status = mark_client_expired_locked(conf);
3146 new->cl_minorversion = cstate->minorversion;
3147 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3148 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3150 add_to_unconfirmed(new);
3153 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3154 exid->clientid.cl_id = conf->cl_clientid.cl_id;
3156 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3157 nfsd4_set_ex_flags(conf, exid);
3159 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3160 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3164 spin_unlock(&nn->client_lock);
3169 expire_client(unconf);
3174 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3176 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3179 /* The slot is in use, and no response has been sent. */
3181 if (seqid == slot_seqid)
3182 return nfserr_jukebox;
3184 return nfserr_seq_misordered;
3186 /* Note unsigned 32-bit arithmetic handles wraparound: */
3187 if (likely(seqid == slot_seqid + 1))
3189 if (seqid == slot_seqid)
3190 return nfserr_replay_cache;
3191 return nfserr_seq_misordered;
3195 * Cache the create session result into the create session single DRC
3196 * slot cache by saving the xdr structure. sl_seqid has been set.
3197 * Do this for solo or embedded create session operations.
3200 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3201 struct nfsd4_clid_slot *slot, __be32 nfserr)
3203 slot->sl_status = nfserr;
3204 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3208 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3209 struct nfsd4_clid_slot *slot)
3211 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3212 return slot->sl_status;
3215 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3216 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3217 1 + /* MIN tag is length with zero, only length */ \
3218 3 + /* version, opcount, opcode */ \
3219 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3220 /* seqid, slotID, slotID, cache */ \
3221 4 ) * sizeof(__be32))
3223 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3224 2 + /* verifier: AUTH_NULL, length 0 */\
3226 1 + /* MIN tag is length with zero, only length */ \
3227 3 + /* opcount, opcode, opstatus*/ \
3228 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3229 /* seqid, slotID, slotID, slotID, status */ \
3230 5 ) * sizeof(__be32))
3232 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3234 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3236 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3237 return nfserr_toosmall;
3238 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3239 return nfserr_toosmall;
3240 ca->headerpadsz = 0;
3241 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3242 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3243 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3244 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3245 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3246 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3248 * Note decreasing slot size below client's request may make it
3249 * difficult for client to function correctly, whereas
3250 * decreasing the number of slots will (just?) affect
3251 * performance. When short on memory we therefore prefer to
3252 * decrease number of slots instead of their size. Clients that
3253 * request larger slots than they need will get poor results:
3254 * Note that we always allow at least one slot, because our
3255 * accounting is soft and provides no guarantees either way.
3257 ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3263 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3264 * These are based on similar macros in linux/sunrpc/msg_prot.h .
3266 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
3267 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3269 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3270 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3272 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3273 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3274 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3275 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3278 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3280 ca->headerpadsz = 0;
3282 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3283 return nfserr_toosmall;
3284 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3285 return nfserr_toosmall;
3286 ca->maxresp_cached = 0;
3288 return nfserr_toosmall;
3293 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3295 switch (cbs->flavor) {
3301 * GSS case: the spec doesn't allow us to return this
3302 * error. But it also doesn't allow us not to support
3304 * I'd rather this fail hard than return some error the
3305 * client might think it can already handle:
3307 return nfserr_encr_alg_unsupp;
3312 nfsd4_create_session(struct svc_rqst *rqstp,
3313 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3315 struct nfsd4_create_session *cr_ses = &u->create_session;
3316 struct sockaddr *sa = svc_addr(rqstp);
3317 struct nfs4_client *conf, *unconf;
3318 struct nfs4_client *old = NULL;
3319 struct nfsd4_session *new;
3320 struct nfsd4_conn *conn;
3321 struct nfsd4_clid_slot *cs_slot = NULL;
3323 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3325 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3326 return nfserr_inval;
3327 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
3330 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
3333 status = check_backchannel_attrs(&cr_ses->back_channel);
3335 goto out_release_drc_mem;
3336 status = nfserr_jukebox;
3337 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
3339 goto out_release_drc_mem;
3340 conn = alloc_conn_from_crses(rqstp, cr_ses);
3342 goto out_free_session;
3344 spin_lock(&nn->client_lock);
3345 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
3346 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
3347 WARN_ON_ONCE(conf && unconf);
3350 status = nfserr_wrong_cred;
3351 if (!nfsd4_mach_creds_match(conf, rqstp))
3353 cs_slot = &conf->cl_cs_slot;
3354 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3356 if (status == nfserr_replay_cache)
3357 status = nfsd4_replay_create_session(cr_ses, cs_slot);
3360 } else if (unconf) {
3361 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
3362 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
3363 status = nfserr_clid_inuse;
3366 status = nfserr_wrong_cred;
3367 if (!nfsd4_mach_creds_match(unconf, rqstp))
3369 cs_slot = &unconf->cl_cs_slot;
3370 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
3372 /* an unconfirmed replay returns misordered */
3373 status = nfserr_seq_misordered;
3376 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3378 status = mark_client_expired_locked(old);
3384 move_to_confirmed(unconf);
3387 status = nfserr_stale_clientid;
3391 /* Persistent sessions are not supported */
3392 cr_ses->flags &= ~SESSION4_PERSIST;
3393 /* Upshifting from TCP to RDMA is not supported */
3394 cr_ses->flags &= ~SESSION4_RDMA;
3396 init_session(rqstp, new, conf, cr_ses);
3397 nfsd4_get_session_locked(new);
3399 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3400 NFS4_MAX_SESSIONID_LEN);
3401 cs_slot->sl_seqid++;
3402 cr_ses->seqid = cs_slot->sl_seqid;
3404 /* cache solo and embedded create sessions under the client_lock */
3405 nfsd4_cache_create_session(cr_ses, cs_slot, status);
3406 spin_unlock(&nn->client_lock);
3407 /* init connection and backchannel */
3408 nfsd4_init_conn(rqstp, conn, new);
3409 nfsd4_put_session(new);
3414 spin_unlock(&nn->client_lock);
3419 __free_session(new);
3420 out_release_drc_mem:
3421 nfsd4_put_drc_mem(&cr_ses->fore_channel);
3425 static __be32 nfsd4_map_bcts_dir(u32 *dir)
3428 case NFS4_CDFC4_FORE:
3429 case NFS4_CDFC4_BACK:
3431 case NFS4_CDFC4_FORE_OR_BOTH:
3432 case NFS4_CDFC4_BACK_OR_BOTH:
3433 *dir = NFS4_CDFC4_BOTH;
3436 return nfserr_inval;
3439 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3440 struct nfsd4_compound_state *cstate,
3441 union nfsd4_op_u *u)
3443 struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3444 struct nfsd4_session *session = cstate->session;
3445 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3448 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
3451 spin_lock(&nn->client_lock);
3452 session->se_cb_prog = bc->bc_cb_program;
3453 session->se_cb_sec = bc->bc_cb_sec;
3454 spin_unlock(&nn->client_lock);
3456 nfsd4_probe_callback(session->se_client);
3461 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3462 struct nfsd4_compound_state *cstate,
3463 union nfsd4_op_u *u)
3465 struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3467 struct nfsd4_conn *conn;
3468 struct nfsd4_session *session;
3469 struct net *net = SVC_NET(rqstp);
3470 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3472 if (!nfsd4_last_compound_op(rqstp))
3473 return nfserr_not_only_op;
3474 spin_lock(&nn->client_lock);
3475 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
3476 spin_unlock(&nn->client_lock);
3478 goto out_no_session;
3479 status = nfserr_wrong_cred;
3480 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
3482 status = nfsd4_map_bcts_dir(&bcts->dir);
3485 conn = alloc_conn(rqstp, bcts->dir);
3486 status = nfserr_jukebox;
3489 nfsd4_init_conn(rqstp, conn, session);
3492 nfsd4_put_session(session);
3497 static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3499 if (!cstate->session)
3501 return !memcmp(sid, &cstate->session->se_sessionid, sizeof(*sid));
3505 nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3506 union nfsd4_op_u *u)
3508 struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3509 struct nfsd4_session *ses;
3511 int ref_held_by_me = 0;
3512 struct net *net = SVC_NET(r);
3513 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3515 status = nfserr_not_only_op;
3516 if (nfsd4_compound_in_session(cstate, sessionid)) {
3517 if (!nfsd4_last_compound_op(r))
3521 dump_sessionid(__func__, sessionid);
3522 spin_lock(&nn->client_lock);
3523 ses = find_in_sessionid_hashtbl(sessionid, net, &status);
3525 goto out_client_lock;
3526 status = nfserr_wrong_cred;
3527 if (!nfsd4_mach_creds_match(ses->se_client, r))
3528 goto out_put_session;
3529 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
3531 goto out_put_session;
3532 unhash_session(ses);
3533 spin_unlock(&nn->client_lock);
3535 nfsd4_probe_callback_sync(ses->se_client);
3537 spin_lock(&nn->client_lock);
3540 nfsd4_put_session_locked(ses);
3542 spin_unlock(&nn->client_lock);
3547 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3549 struct nfsd4_conn *c;
3551 list_for_each_entry(c, &s->se_conns, cn_persession) {
3552 if (c->cn_xprt == xpt) {
3559 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3561 struct nfs4_client *clp = ses->se_client;
3562 struct nfsd4_conn *c;
3563 __be32 status = nfs_ok;
3566 spin_lock(&clp->cl_lock);
3567 c = __nfsd4_find_conn(new->cn_xprt, ses);
3570 status = nfserr_conn_not_bound_to_session;
3571 if (clp->cl_mach_cred)
3573 __nfsd4_hash_conn(new, ses);
3574 spin_unlock(&clp->cl_lock);
3575 ret = nfsd4_register_conn(new);
3577 /* oops; xprt is already down: */
3578 nfsd4_conn_lost(&new->cn_xpt_user);
3581 spin_unlock(&clp->cl_lock);
3586 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3588 struct nfsd4_compoundargs *args = rqstp->rq_argp;
3590 return args->opcnt > session->se_fchannel.maxops;
3593 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3594 struct nfsd4_session *session)
3596 struct xdr_buf *xb = &rqstp->rq_arg;
3598 return xb->len > session->se_fchannel.maxreq_sz;
3601 static bool replay_matches_cache(struct svc_rqst *rqstp,
3602 struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3604 struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3606 if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3607 (bool)seq->cachethis)
3610 * If there's an error then the reply can have fewer ops than
3613 if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3616 * But if we cached a reply with *more* ops than the call you're
3617 * sending us now, then this new call is clearly not really a
3618 * replay of the old one:
3620 if (slot->sl_opcnt > argp->opcnt)
3622 /* This is the only check explicitly called by spec: */
3623 if (!same_creds(&rqstp->rq_cred, &slot->sl_cred))
3626 * There may be more comparisons we could actually do, but the
3627 * spec doesn't require us to catch every case where the calls
3628 * don't match (that would require caching the call as well as
3629 * the reply), so we don't bother.
3635 nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3636 union nfsd4_op_u *u)
3638 struct nfsd4_sequence *seq = &u->sequence;
3639 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3640 struct xdr_stream *xdr = &resp->xdr;
3641 struct nfsd4_session *session;
3642 struct nfs4_client *clp;
3643 struct nfsd4_slot *slot;
3644 struct nfsd4_conn *conn;
3647 struct net *net = SVC_NET(rqstp);
3648 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3650 if (resp->opcnt != 1)
3651 return nfserr_sequence_pos;
3654 * Will be either used or freed by nfsd4_sequence_check_conn
3657 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3659 return nfserr_jukebox;
3661 spin_lock(&nn->client_lock);
3662 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3664 goto out_no_session;
3665 clp = session->se_client;
3667 status = nfserr_too_many_ops;
3668 if (nfsd4_session_too_many_ops(rqstp, session))
3669 goto out_put_session;
3671 status = nfserr_req_too_big;
3672 if (nfsd4_request_too_big(rqstp, session))
3673 goto out_put_session;
3675 status = nfserr_badslot;
3676 if (seq->slotid >= session->se_fchannel.maxreqs)
3677 goto out_put_session;
3679 slot = session->se_slots[seq->slotid];
3680 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3682 /* We do not negotiate the number of slots yet, so set the
3683 * maxslots to the session maxreqs which is used to encode
3684 * sr_highest_slotid and the sr_target_slot id to maxslots */
3685 seq->maxslots = session->se_fchannel.maxreqs;
3687 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3688 slot->sl_flags & NFSD4_SLOT_INUSE);
3689 if (status == nfserr_replay_cache) {
3690 status = nfserr_seq_misordered;
3691 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3692 goto out_put_session;
3693 status = nfserr_seq_false_retry;
3694 if (!replay_matches_cache(rqstp, seq, slot))
3695 goto out_put_session;
3696 cstate->slot = slot;
3697 cstate->session = session;
3699 /* Return the cached reply status and set cstate->status
3700 * for nfsd4_proc_compound processing */
3701 status = nfsd4_replay_cache_entry(resp, seq);
3702 cstate->status = nfserr_replay_cache;
3706 goto out_put_session;
3708 status = nfsd4_sequence_check_conn(conn, session);
3711 goto out_put_session;
3713 buflen = (seq->cachethis) ?
3714 session->se_fchannel.maxresp_cached :
3715 session->se_fchannel.maxresp_sz;
3716 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3718 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3719 goto out_put_session;
3720 svc_reserve(rqstp, buflen);
3723 /* Success! bump slot seqid */
3724 slot->sl_seqid = seq->seqid;
3725 slot->sl_flags |= NFSD4_SLOT_INUSE;
3727 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3729 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3731 cstate->slot = slot;
3732 cstate->session = session;
3736 switch (clp->cl_cb_state) {
3738 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3740 case NFSD4_CB_FAULT:
3741 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3744 seq->status_flags = 0;
3746 if (!list_empty(&clp->cl_revoked))
3747 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3751 spin_unlock(&nn->client_lock);
3754 nfsd4_put_session_locked(session);
3755 goto out_no_session;
3759 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3761 struct nfsd4_compound_state *cs = &resp->cstate;
3763 if (nfsd4_has_session(cs)) {
3764 if (cs->status != nfserr_replay_cache) {
3765 nfsd4_store_cache_entry(resp);
3766 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3768 /* Drop session reference that was taken in nfsd4_sequence() */
3769 nfsd4_put_session(cs->session);
3771 put_client_renew(cs->clp);
3775 nfsd4_destroy_clientid(struct svc_rqst *rqstp,
3776 struct nfsd4_compound_state *cstate,
3777 union nfsd4_op_u *u)
3779 struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
3780 struct nfs4_client *conf, *unconf;
3781 struct nfs4_client *clp = NULL;
3783 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3785 spin_lock(&nn->client_lock);
3786 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3787 conf = find_confirmed_client(&dc->clientid, true, nn);
3788 WARN_ON_ONCE(conf && unconf);
3791 if (client_has_state(conf)) {
3792 status = nfserr_clientid_busy;
3795 status = mark_client_expired_locked(conf);
3802 status = nfserr_stale_clientid;
3805 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3807 status = nfserr_wrong_cred;
3810 unhash_client_locked(clp);
3812 spin_unlock(&nn->client_lock);
3819 nfsd4_reclaim_complete(struct svc_rqst *rqstp,
3820 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3822 struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
3825 if (rc->rca_one_fs) {
3826 if (!cstate->current_fh.fh_dentry)
3827 return nfserr_nofilehandle;
3829 * We don't take advantage of the rca_one_fs case.
3830 * That's OK, it's optional, we can safely ignore it.
3835 status = nfserr_complete_already;
3836 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3837 &cstate->session->se_client->cl_flags))
3840 status = nfserr_stale_clientid;
3841 if (is_client_expired(cstate->session->se_client))
3843 * The following error isn't really legal.
3844 * But we only get here if the client just explicitly
3845 * destroyed the client. Surely it no longer cares what
3846 * error it gets back on an operation for the dead
3852 nfsd4_client_record_create(cstate->session->se_client);
3853 inc_reclaim_complete(cstate->session->se_client);
3859 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3860 union nfsd4_op_u *u)
3862 struct nfsd4_setclientid *setclid = &u->setclientid;
3863 struct xdr_netobj clname = setclid->se_name;
3864 nfs4_verifier clverifier = setclid->se_verf;
3865 struct nfs4_client *conf, *new;
3866 struct nfs4_client *unconf = NULL;
3868 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3870 new = create_client(clname, rqstp, &clverifier);
3872 return nfserr_jukebox;
3873 /* Cases below refer to rfc 3530 section 14.2.33: */
3874 spin_lock(&nn->client_lock);
3875 conf = find_confirmed_client_by_name(&clname, nn);
3876 if (conf && client_has_state(conf)) {
3878 status = nfserr_clid_inuse;
3879 if (clp_used_exchangeid(conf))
3881 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3882 char addr_str[INET6_ADDRSTRLEN];
3883 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3885 dprintk("NFSD: setclientid: string in use by client "
3886 "at %s\n", addr_str);
3890 unconf = find_unconfirmed_client_by_name(&clname, nn);
3892 unhash_client_locked(unconf);
3893 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3894 /* case 1: probable callback update */
3895 copy_clid(new, conf);
3896 gen_confirm(new, nn);
3897 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3899 new->cl_minorversion = 0;
3900 gen_callback(new, setclid, rqstp);
3901 add_to_unconfirmed(new);
3902 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3903 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3904 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3908 spin_unlock(&nn->client_lock);
3912 expire_client(unconf);
3918 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3919 struct nfsd4_compound_state *cstate,
3920 union nfsd4_op_u *u)
3922 struct nfsd4_setclientid_confirm *setclientid_confirm =
3923 &u->setclientid_confirm;
3924 struct nfs4_client *conf, *unconf;
3925 struct nfs4_client *old = NULL;
3926 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3927 clientid_t * clid = &setclientid_confirm->sc_clientid;
3929 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3931 if (STALE_CLIENTID(clid, nn))
3932 return nfserr_stale_clientid;
3934 spin_lock(&nn->client_lock);
3935 conf = find_confirmed_client(clid, false, nn);
3936 unconf = find_unconfirmed_client(clid, false, nn);
3938 * We try hard to give out unique clientid's, so if we get an
3939 * attempt to confirm the same clientid with a different cred,
3940 * the client may be buggy; this should never happen.
3942 * Nevertheless, RFC 7530 recommends INUSE for this case:
3944 status = nfserr_clid_inuse;
3945 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3947 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3949 /* cases below refer to rfc 3530 section 14.2.34: */
3950 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3951 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3952 /* case 2: probable retransmit */
3954 } else /* case 4: client hasn't noticed we rebooted yet? */
3955 status = nfserr_stale_clientid;
3959 if (conf) { /* case 1: callback update */
3961 unhash_client_locked(old);
3962 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3963 } else { /* case 3: normal case; new or rebooted client */
3964 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3966 status = nfserr_clid_inuse;
3967 if (client_has_state(old)
3968 && !same_creds(&unconf->cl_cred,
3971 status = mark_client_expired_locked(old);
3977 move_to_confirmed(unconf);
3980 get_client_locked(conf);
3981 spin_unlock(&nn->client_lock);
3982 nfsd4_probe_callback(conf);
3983 spin_lock(&nn->client_lock);
3984 put_client_renew_locked(conf);
3986 spin_unlock(&nn->client_lock);
3992 static struct nfs4_file *nfsd4_alloc_file(void)
3994 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3997 /* OPEN Share state helper functions */
3998 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3999 struct nfs4_file *fp)
4001 lockdep_assert_held(&state_lock);
4003 refcount_set(&fp->fi_ref, 1);
4004 spin_lock_init(&fp->fi_lock);
4005 INIT_LIST_HEAD(&fp->fi_stateids);
4006 INIT_LIST_HEAD(&fp->fi_delegations);
4007 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
4008 fh_copy_shallow(&fp->fi_fhandle, fh);
4009 fp->fi_deleg_file = NULL;
4010 fp->fi_had_conflict = false;
4011 fp->fi_share_deny = 0;
4012 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4013 memset(fp->fi_access, 0, sizeof(fp->fi_access));
4014 #ifdef CONFIG_NFSD_PNFS
4015 INIT_LIST_HEAD(&fp->fi_lo_states);
4016 atomic_set(&fp->fi_lo_recalls, 0);
4018 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
4022 nfsd4_free_slabs(void)
4024 kmem_cache_destroy(client_slab);
4025 kmem_cache_destroy(openowner_slab);
4026 kmem_cache_destroy(lockowner_slab);
4027 kmem_cache_destroy(file_slab);
4028 kmem_cache_destroy(stateid_slab);
4029 kmem_cache_destroy(deleg_slab);
4030 kmem_cache_destroy(odstate_slab);
4034 nfsd4_init_slabs(void)
4036 client_slab = kmem_cache_create("nfsd4_clients",
4037 sizeof(struct nfs4_client), 0, 0, NULL);
4038 if (client_slab == NULL)
4040 openowner_slab = kmem_cache_create("nfsd4_openowners",
4041 sizeof(struct nfs4_openowner), 0, 0, NULL);
4042 if (openowner_slab == NULL)
4043 goto out_free_client_slab;
4044 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
4045 sizeof(struct nfs4_lockowner), 0, 0, NULL);
4046 if (lockowner_slab == NULL)
4047 goto out_free_openowner_slab;
4048 file_slab = kmem_cache_create("nfsd4_files",
4049 sizeof(struct nfs4_file), 0, 0, NULL);
4050 if (file_slab == NULL)
4051 goto out_free_lockowner_slab;
4052 stateid_slab = kmem_cache_create("nfsd4_stateids",
4053 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
4054 if (stateid_slab == NULL)
4055 goto out_free_file_slab;
4056 deleg_slab = kmem_cache_create("nfsd4_delegations",
4057 sizeof(struct nfs4_delegation), 0, 0, NULL);
4058 if (deleg_slab == NULL)
4059 goto out_free_stateid_slab;
4060 odstate_slab = kmem_cache_create("nfsd4_odstate",
4061 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
4062 if (odstate_slab == NULL)
4063 goto out_free_deleg_slab;
4066 out_free_deleg_slab:
4067 kmem_cache_destroy(deleg_slab);
4068 out_free_stateid_slab:
4069 kmem_cache_destroy(stateid_slab);
4071 kmem_cache_destroy(file_slab);
4072 out_free_lockowner_slab:
4073 kmem_cache_destroy(lockowner_slab);
4074 out_free_openowner_slab:
4075 kmem_cache_destroy(openowner_slab);
4076 out_free_client_slab:
4077 kmem_cache_destroy(client_slab);
4079 dprintk("nfsd4: out of memory while initializing nfsv4\n");
4083 static void init_nfs4_replay(struct nfs4_replay *rp)
4085 rp->rp_status = nfserr_serverfault;
4087 rp->rp_buf = rp->rp_ibuf;
4088 mutex_init(&rp->rp_mutex);
4091 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4092 struct nfs4_stateowner *so)
4094 if (!nfsd4_has_session(cstate)) {
4095 mutex_lock(&so->so_replay.rp_mutex);
4096 cstate->replay_owner = nfs4_get_stateowner(so);
4100 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4102 struct nfs4_stateowner *so = cstate->replay_owner;
4105 cstate->replay_owner = NULL;
4106 mutex_unlock(&so->so_replay.rp_mutex);
4107 nfs4_put_stateowner(so);
4111 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4113 struct nfs4_stateowner *sop;
4115 sop = kmem_cache_alloc(slab, GFP_KERNEL);
4119 xdr_netobj_dup(&sop->so_owner, owner, GFP_KERNEL);
4120 if (!sop->so_owner.data) {
4121 kmem_cache_free(slab, sop);
4125 INIT_LIST_HEAD(&sop->so_stateids);
4126 sop->so_client = clp;
4127 init_nfs4_replay(&sop->so_replay);
4128 atomic_set(&sop->so_count, 1);
4132 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4134 lockdep_assert_held(&clp->cl_lock);
4136 list_add(&oo->oo_owner.so_strhash,
4137 &clp->cl_ownerstr_hashtbl[strhashval]);
4138 list_add(&oo->oo_perclient, &clp->cl_openowners);
4141 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4143 unhash_openowner_locked(openowner(so));
4146 static void nfs4_free_openowner(struct nfs4_stateowner *so)
4148 struct nfs4_openowner *oo = openowner(so);
4150 kmem_cache_free(openowner_slab, oo);
4153 static const struct nfs4_stateowner_operations openowner_ops = {
4154 .so_unhash = nfs4_unhash_openowner,
4155 .so_free = nfs4_free_openowner,
4158 static struct nfs4_ol_stateid *
4159 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4161 struct nfs4_ol_stateid *local, *ret = NULL;
4162 struct nfs4_openowner *oo = open->op_openowner;
4164 lockdep_assert_held(&fp->fi_lock);
4166 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4167 /* ignore lock owners */
4168 if (local->st_stateowner->so_is_open_owner == 0)
4170 if (local->st_stateowner != &oo->oo_owner)
4172 if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4174 refcount_inc(&ret->st_stid.sc_count);
4182 nfsd4_verify_open_stid(struct nfs4_stid *s)
4184 __be32 ret = nfs_ok;
4186 switch (s->sc_type) {
4190 case NFS4_CLOSED_STID:
4191 case NFS4_CLOSED_DELEG_STID:
4192 ret = nfserr_bad_stateid;
4194 case NFS4_REVOKED_DELEG_STID:
4195 ret = nfserr_deleg_revoked;
4200 /* Lock the stateid st_mutex, and deal with races with CLOSE */
4202 nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4206 mutex_lock_nested(&stp->st_mutex, LOCK_STATEID_MUTEX);
4207 ret = nfsd4_verify_open_stid(&stp->st_stid);
4209 mutex_unlock(&stp->st_mutex);
4213 static struct nfs4_ol_stateid *
4214 nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4216 struct nfs4_ol_stateid *stp;
4218 spin_lock(&fp->fi_lock);
4219 stp = nfsd4_find_existing_open(fp, open);
4220 spin_unlock(&fp->fi_lock);
4221 if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4223 nfs4_put_stid(&stp->st_stid);
4228 static struct nfs4_openowner *
4229 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4230 struct nfsd4_compound_state *cstate)
4232 struct nfs4_client *clp = cstate->clp;
4233 struct nfs4_openowner *oo, *ret;
4235 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
4238 oo->oo_owner.so_ops = &openowner_ops;
4239 oo->oo_owner.so_is_open_owner = 1;
4240 oo->oo_owner.so_seqid = open->op_seqid;
4242 if (nfsd4_has_session(cstate))
4243 oo->oo_flags |= NFS4_OO_CONFIRMED;
4245 oo->oo_last_closed_stid = NULL;
4246 INIT_LIST_HEAD(&oo->oo_close_lru);
4247 spin_lock(&clp->cl_lock);
4248 ret = find_openstateowner_str_locked(strhashval, open, clp);
4250 hash_openowner(oo, clp, strhashval);
4253 nfs4_free_stateowner(&oo->oo_owner);
4255 spin_unlock(&clp->cl_lock);
4259 static struct nfs4_ol_stateid *
4260 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4263 struct nfs4_openowner *oo = open->op_openowner;
4264 struct nfs4_ol_stateid *retstp = NULL;
4265 struct nfs4_ol_stateid *stp;
4268 /* We are moving these outside of the spinlocks to avoid the warnings */
4269 mutex_init(&stp->st_mutex);
4270 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
4273 spin_lock(&oo->oo_owner.so_client->cl_lock);
4274 spin_lock(&fp->fi_lock);
4276 retstp = nfsd4_find_existing_open(fp, open);
4280 open->op_stp = NULL;
4281 refcount_inc(&stp->st_stid.sc_count);
4282 stp->st_stid.sc_type = NFS4_OPEN_STID;
4283 INIT_LIST_HEAD(&stp->st_locks);
4284 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
4286 stp->st_stid.sc_file = fp;
4287 stp->st_access_bmap = 0;
4288 stp->st_deny_bmap = 0;
4289 stp->st_openstp = NULL;
4290 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
4291 list_add(&stp->st_perfile, &fp->fi_stateids);
4294 spin_unlock(&fp->fi_lock);
4295 spin_unlock(&oo->oo_owner.so_client->cl_lock);
4297 /* Handle races with CLOSE */
4298 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
4299 nfs4_put_stid(&retstp->st_stid);
4302 /* To keep mutex tracking happy */
4303 mutex_unlock(&stp->st_mutex);
4310 * In the 4.0 case we need to keep the owners around a little while to handle
4311 * CLOSE replay. We still do need to release any file access that is held by
4312 * them before returning however.
4315 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4317 struct nfs4_ol_stateid *last;
4318 struct nfs4_openowner *oo = openowner(s->st_stateowner);
4319 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
4322 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4325 * We know that we hold one reference via nfsd4_close, and another
4326 * "persistent" reference for the client. If the refcount is higher
4327 * than 2, then there are still calls in progress that are using this
4328 * stateid. We can't put the sc_file reference until they are finished.
4329 * Wait for the refcount to drop to 2. Since it has been unhashed,
4330 * there should be no danger of the refcount going back up again at
4333 wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4335 release_all_access(s);
4336 if (s->st_stid.sc_file) {
4337 put_nfs4_file(s->st_stid.sc_file);
4338 s->st_stid.sc_file = NULL;
4341 spin_lock(&nn->client_lock);
4342 last = oo->oo_last_closed_stid;
4343 oo->oo_last_closed_stid = s;
4344 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
4345 oo->oo_time = ktime_get_boottime_seconds();
4346 spin_unlock(&nn->client_lock);
4348 nfs4_put_stid(&last->st_stid);
4351 /* search file_hashtbl[] for file */
4352 static struct nfs4_file *
4353 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
4355 struct nfs4_file *fp;
4357 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash,
4358 lockdep_is_held(&state_lock)) {
4359 if (fh_match(&fp->fi_fhandle, fh)) {
4360 if (refcount_inc_not_zero(&fp->fi_ref))
4368 find_file(struct knfsd_fh *fh)
4370 struct nfs4_file *fp;
4371 unsigned int hashval = file_hashval(fh);
4374 fp = find_file_locked(fh, hashval);
4379 static struct nfs4_file *
4380 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
4382 struct nfs4_file *fp;
4383 unsigned int hashval = file_hashval(fh);
4386 fp = find_file_locked(fh, hashval);
4391 spin_lock(&state_lock);
4392 fp = find_file_locked(fh, hashval);
4393 if (likely(fp == NULL)) {
4394 nfsd4_init_file(fh, hashval, new);
4397 spin_unlock(&state_lock);
4403 * Called to check deny when READ with all zero stateid or
4404 * WRITE with all zero or all one stateid
4407 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4409 struct nfs4_file *fp;
4410 __be32 ret = nfs_ok;
4412 fp = find_file(¤t_fh->fh_handle);
4415 /* Check for conflicting share reservations */
4416 spin_lock(&fp->fi_lock);
4417 if (fp->fi_share_deny & deny_type)
4418 ret = nfserr_locked;
4419 spin_unlock(&fp->fi_lock);
4424 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4426 struct nfs4_delegation *dp = cb_to_delegation(cb);
4427 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
4430 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
4433 * We can't do this in nfsd_break_deleg_cb because it is
4434 * already holding inode->i_lock.
4436 * If the dl_time != 0, then we know that it has already been
4437 * queued for a lease break. Don't queue it again.
4439 spin_lock(&state_lock);
4440 if (dp->dl_time == 0) {
4441 dp->dl_time = ktime_get_boottime_seconds();
4442 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
4444 spin_unlock(&state_lock);
4447 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4448 struct rpc_task *task)
4450 struct nfs4_delegation *dp = cb_to_delegation(cb);
4452 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
4455 switch (task->tk_status) {
4458 case -NFS4ERR_DELAY:
4459 rpc_delay(task, 2 * HZ);
4462 case -NFS4ERR_BAD_STATEID:
4464 * Race: client probably got cb_recall before open reply
4465 * granting delegation.
4467 if (dp->dl_retries--) {
4468 rpc_delay(task, 2 * HZ);
4477 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4479 struct nfs4_delegation *dp = cb_to_delegation(cb);
4481 nfs4_put_stid(&dp->dl_stid);
4484 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4485 .prepare = nfsd4_cb_recall_prepare,
4486 .done = nfsd4_cb_recall_done,
4487 .release = nfsd4_cb_recall_release,
4490 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4493 * We're assuming the state code never drops its reference
4494 * without first removing the lease. Since we're in this lease
4495 * callback (and since the lease code is serialized by the
4496 * i_lock) we know the server hasn't removed the lease yet, and
4497 * we know it's safe to take a reference.
4499 refcount_inc(&dp->dl_stid.sc_count);
4500 nfsd4_run_cb(&dp->dl_recall);
4503 /* Called from break_lease() with i_lock held. */
4505 nfsd_break_deleg_cb(struct file_lock *fl)
4508 struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4509 struct nfs4_file *fp = dp->dl_stid.sc_file;
4512 * We don't want the locks code to timeout the lease for us;
4513 * we'll remove it ourself if a delegation isn't returned
4516 fl->fl_break_time = 0;
4518 spin_lock(&fp->fi_lock);
4519 fp->fi_had_conflict = true;
4520 nfsd_break_one_deleg(dp);
4521 spin_unlock(&fp->fi_lock);
4526 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
4527 struct list_head *dispose)
4530 return lease_modify(onlist, arg, dispose);
4535 static const struct lock_manager_operations nfsd_lease_mng_ops = {
4536 .lm_break = nfsd_break_deleg_cb,
4537 .lm_change = nfsd_change_deleg_cb,
4540 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
4542 if (nfsd4_has_session(cstate))
4544 if (seqid == so->so_seqid - 1)
4545 return nfserr_replay_me;
4546 if (seqid == so->so_seqid)
4548 return nfserr_bad_seqid;
4551 static __be32 lookup_clientid(clientid_t *clid,
4552 struct nfsd4_compound_state *cstate,
4553 struct nfsd_net *nn,
4556 struct nfs4_client *found;
4559 found = cstate->clp;
4560 if (!same_clid(&found->cl_clientid, clid))
4561 return nfserr_stale_clientid;
4565 if (STALE_CLIENTID(clid, nn))
4566 return nfserr_stale_clientid;
4569 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
4570 * cached already then we know this is for is for v4.0 and "sessions"
4573 WARN_ON_ONCE(cstate->session);
4574 spin_lock(&nn->client_lock);
4575 found = find_confirmed_client(clid, sessions, nn);
4577 spin_unlock(&nn->client_lock);
4578 return nfserr_expired;
4580 atomic_inc(&found->cl_rpc_users);
4581 spin_unlock(&nn->client_lock);
4583 /* Cache the nfs4_client in cstate! */
4584 cstate->clp = found;
4589 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
4590 struct nfsd4_open *open, struct nfsd_net *nn)
4592 clientid_t *clientid = &open->op_clientid;
4593 struct nfs4_client *clp = NULL;
4594 unsigned int strhashval;
4595 struct nfs4_openowner *oo = NULL;
4598 if (STALE_CLIENTID(&open->op_clientid, nn))
4599 return nfserr_stale_clientid;
4601 * In case we need it later, after we've already created the
4602 * file and don't want to risk a further failure:
4604 open->op_file = nfsd4_alloc_file();
4605 if (open->op_file == NULL)
4606 return nfserr_jukebox;
4608 status = lookup_clientid(clientid, cstate, nn, false);
4613 strhashval = ownerstr_hashval(&open->op_owner);
4614 oo = find_openstateowner_str(strhashval, open, clp);
4615 open->op_openowner = oo;
4619 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
4620 /* Replace unconfirmed owners without checking for replay. */
4621 release_openowner(oo);
4622 open->op_openowner = NULL;
4625 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
4630 oo = alloc_init_open_stateowner(strhashval, open, cstate);
4632 return nfserr_jukebox;
4633 open->op_openowner = oo;
4635 open->op_stp = nfs4_alloc_open_stateid(clp);
4637 return nfserr_jukebox;
4639 if (nfsd4_has_session(cstate) &&
4640 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
4641 open->op_odstate = alloc_clnt_odstate(clp);
4642 if (!open->op_odstate)
4643 return nfserr_jukebox;
4649 static inline __be32
4650 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
4652 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
4653 return nfserr_openmode;
4658 static int share_access_to_flags(u32 share_access)
4660 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
4663 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
4665 struct nfs4_stid *ret;
4667 ret = find_stateid_by_type(cl, s,
4668 NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
4671 return delegstateid(ret);
4674 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
4676 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
4677 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
4681 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
4682 struct nfs4_delegation **dp)
4685 __be32 status = nfserr_bad_stateid;
4686 struct nfs4_delegation *deleg;
4688 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
4691 if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
4692 nfs4_put_stid(&deleg->dl_stid);
4693 if (cl->cl_minorversion)
4694 status = nfserr_deleg_revoked;
4697 flags = share_access_to_flags(open->op_share_access);
4698 status = nfs4_check_delegmode(deleg, flags);
4700 nfs4_put_stid(&deleg->dl_stid);
4705 if (!nfsd4_is_deleg_cur(open))
4709 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4713 static inline int nfs4_access_to_access(u32 nfs4_access)
4717 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4718 flags |= NFSD_MAY_READ;
4719 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4720 flags |= NFSD_MAY_WRITE;
4724 static inline __be32
4725 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4726 struct nfsd4_open *open)
4728 struct iattr iattr = {
4729 .ia_valid = ATTR_SIZE,
4732 if (!open->op_truncate)
4734 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4735 return nfserr_inval;
4736 return nfsd_setattr(rqstp, fh, &iattr, 0, (time64_t)0);
4739 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4740 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4741 struct nfsd4_open *open)
4743 struct nfsd_file *nf = NULL;
4745 int oflag = nfs4_access_to_omode(open->op_share_access);
4746 int access = nfs4_access_to_access(open->op_share_access);
4747 unsigned char old_access_bmap, old_deny_bmap;
4749 spin_lock(&fp->fi_lock);
4752 * Are we trying to set a deny mode that would conflict with
4755 status = nfs4_file_check_deny(fp, open->op_share_deny);
4756 if (status != nfs_ok) {
4757 spin_unlock(&fp->fi_lock);
4761 /* set access to the file */
4762 status = nfs4_file_get_access(fp, open->op_share_access);
4763 if (status != nfs_ok) {
4764 spin_unlock(&fp->fi_lock);
4768 /* Set access bits in stateid */
4769 old_access_bmap = stp->st_access_bmap;
4770 set_access(open->op_share_access, stp);
4772 /* Set new deny mask */
4773 old_deny_bmap = stp->st_deny_bmap;
4774 set_deny(open->op_share_deny, stp);
4775 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4777 if (!fp->fi_fds[oflag]) {
4778 spin_unlock(&fp->fi_lock);
4779 status = nfsd_file_acquire(rqstp, cur_fh, access, &nf);
4781 goto out_put_access;
4782 spin_lock(&fp->fi_lock);
4783 if (!fp->fi_fds[oflag]) {
4784 fp->fi_fds[oflag] = nf;
4788 spin_unlock(&fp->fi_lock);
4792 status = nfsd4_truncate(rqstp, cur_fh, open);
4794 goto out_put_access;
4798 stp->st_access_bmap = old_access_bmap;
4799 nfs4_file_put_access(fp, open->op_share_access);
4800 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4805 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)
4808 unsigned char old_deny_bmap = stp->st_deny_bmap;
4810 if (!test_access(open->op_share_access, stp))
4811 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4813 /* test and set deny mode */
4814 spin_lock(&fp->fi_lock);
4815 status = nfs4_file_check_deny(fp, open->op_share_deny);
4816 if (status == nfs_ok) {
4817 set_deny(open->op_share_deny, stp);
4818 fp->fi_share_deny |=
4819 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4821 spin_unlock(&fp->fi_lock);
4823 if (status != nfs_ok)
4826 status = nfsd4_truncate(rqstp, cur_fh, open);
4827 if (status != nfs_ok)
4828 reset_union_bmap_deny(old_deny_bmap, stp);
4832 /* Should we give out recallable state?: */
4833 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4835 if (clp->cl_cb_state == NFSD4_CB_UP)
4838 * In the sessions case, since we don't have to establish a
4839 * separate connection for callbacks, we assume it's OK
4840 * until we hear otherwise:
4842 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4845 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
4848 struct file_lock *fl;
4850 fl = locks_alloc_lock();
4853 fl->fl_lmops = &nfsd_lease_mng_ops;
4854 fl->fl_flags = FL_DELEG;
4855 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4856 fl->fl_end = OFFSET_MAX;
4857 fl->fl_owner = (fl_owner_t)dp;
4858 fl->fl_pid = current->tgid;
4859 fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
4863 static struct nfs4_delegation *
4864 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4865 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4868 struct nfs4_delegation *dp;
4869 struct nfsd_file *nf;
4870 struct file_lock *fl;
4873 * The fi_had_conflict and nfs_get_existing_delegation checks
4874 * here are just optimizations; we'll need to recheck them at
4877 if (fp->fi_had_conflict)
4878 return ERR_PTR(-EAGAIN);
4880 nf = find_readable_file(fp);
4882 /* We should always have a readable file here */
4884 return ERR_PTR(-EBADF);
4886 spin_lock(&state_lock);
4887 spin_lock(&fp->fi_lock);
4888 if (nfs4_delegation_exists(clp, fp))
4890 else if (!fp->fi_deleg_file) {
4891 fp->fi_deleg_file = nf;
4892 /* increment early to prevent fi_deleg_file from being
4894 fp->fi_delegees = 1;
4898 spin_unlock(&fp->fi_lock);
4899 spin_unlock(&state_lock);
4903 return ERR_PTR(status);
4906 dp = alloc_init_deleg(clp, fp, fh, odstate);
4910 fl = nfs4_alloc_init_lease(dp, NFS4_OPEN_DELEGATE_READ);
4912 goto out_clnt_odstate;
4914 status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
4916 locks_free_lock(fl);
4918 goto out_clnt_odstate;
4920 spin_lock(&state_lock);
4921 spin_lock(&fp->fi_lock);
4922 if (fp->fi_had_conflict)
4925 status = hash_delegation_locked(dp, fp);
4926 spin_unlock(&fp->fi_lock);
4927 spin_unlock(&state_lock);
4934 vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
4936 put_clnt_odstate(dp->dl_clnt_odstate);
4937 nfs4_put_stid(&dp->dl_stid);
4940 return ERR_PTR(status);
4943 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4945 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4946 if (status == -EAGAIN)
4947 open->op_why_no_deleg = WND4_CONTENTION;
4949 open->op_why_no_deleg = WND4_RESOURCE;
4950 switch (open->op_deleg_want) {
4951 case NFS4_SHARE_WANT_READ_DELEG:
4952 case NFS4_SHARE_WANT_WRITE_DELEG:
4953 case NFS4_SHARE_WANT_ANY_DELEG:
4955 case NFS4_SHARE_WANT_CANCEL:
4956 open->op_why_no_deleg = WND4_CANCELLED;
4958 case NFS4_SHARE_WANT_NO_DELEG:
4965 * Attempt to hand out a delegation.
4967 * Note we don't support write delegations, and won't until the vfs has
4968 * proper support for them.
4971 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4972 struct nfs4_ol_stateid *stp)
4974 struct nfs4_delegation *dp;
4975 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4976 struct nfs4_client *clp = stp->st_stid.sc_client;
4980 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4981 open->op_recall = 0;
4982 switch (open->op_claim_type) {
4983 case NFS4_OPEN_CLAIM_PREVIOUS:
4985 open->op_recall = 1;
4986 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4989 case NFS4_OPEN_CLAIM_NULL:
4990 case NFS4_OPEN_CLAIM_FH:
4992 * Let's not give out any delegations till everyone's
4993 * had the chance to reclaim theirs, *and* until
4994 * NLM locks have all been reclaimed:
4996 if (locks_in_grace(clp->net))
4998 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5001 * Also, if the file was opened for write or
5002 * create, there's a good chance the client's
5003 * about to write to it, resulting in an
5004 * immediate recall (since we don't support
5005 * write delegations):
5007 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
5009 if (open->op_create == NFS4_OPEN_CREATE)
5015 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
5019 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5021 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
5022 STATEID_VAL(&dp->dl_stid.sc_stateid));
5023 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5024 nfs4_put_stid(&dp->dl_stid);
5027 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5028 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5029 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5030 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5031 open->op_recall = 1;
5034 /* 4.1 client asking for a delegation? */
5035 if (open->op_deleg_want)
5036 nfsd4_open_deleg_none_ext(open, status);
5040 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5041 struct nfs4_delegation *dp)
5043 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5044 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5045 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5046 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
5047 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
5048 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5049 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5050 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
5052 /* Otherwise the client must be confused wanting a delegation
5053 * it already has, therefore we don't return
5054 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
5059 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
5061 struct nfsd4_compoundres *resp = rqstp->rq_resp;
5062 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
5063 struct nfs4_file *fp = NULL;
5064 struct nfs4_ol_stateid *stp = NULL;
5065 struct nfs4_delegation *dp = NULL;
5067 bool new_stp = false;
5070 * Lookup file; if found, lookup stateid and check open request,
5071 * and check for delegations in the process of being recalled.
5072 * If not found, create the nfs4_file struct
5074 fp = find_or_add_file(open->op_file, ¤t_fh->fh_handle);
5075 if (fp != open->op_file) {
5076 status = nfs4_check_deleg(cl, open, &dp);
5079 stp = nfsd4_find_and_lock_existing_open(fp, open);
5081 open->op_file = NULL;
5082 status = nfserr_bad_stateid;
5083 if (nfsd4_is_deleg_cur(open))
5088 stp = init_open_stateid(fp, open);
5094 * OPEN the file, or upgrade an existing OPEN.
5095 * If truncate fails, the OPEN fails.
5097 * stp is already locked.
5100 /* Stateid was found, this is an OPEN upgrade */
5101 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
5103 mutex_unlock(&stp->st_mutex);
5107 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
5109 stp->st_stid.sc_type = NFS4_CLOSED_STID;
5110 release_open_stateid(stp);
5111 mutex_unlock(&stp->st_mutex);
5115 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5117 if (stp->st_clnt_odstate == open->op_odstate)
5118 open->op_odstate = NULL;
5121 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
5122 mutex_unlock(&stp->st_mutex);
5124 if (nfsd4_has_session(&resp->cstate)) {
5125 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5126 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5127 open->op_why_no_deleg = WND4_NOT_WANTED;
5133 * Attempt to hand out a delegation. No error return, because the
5134 * OPEN succeeds even if we fail.
5136 nfs4_open_delegation(current_fh, open, stp);
5140 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
5141 STATEID_VAL(&stp->st_stid.sc_stateid));
5143 /* 4.1 client trying to upgrade/downgrade delegation? */
5144 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5145 open->op_deleg_want)
5146 nfsd4_deleg_xgrade_none_ext(open, dp);
5150 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5151 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5153 * To finish the open response, we just need to set the rflags.
5155 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5156 if (nfsd4_has_session(&resp->cstate))
5157 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5158 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5159 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5162 nfs4_put_stid(&dp->dl_stid);
5164 nfs4_put_stid(&stp->st_stid);
5169 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5170 struct nfsd4_open *open)
5172 if (open->op_openowner) {
5173 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5175 nfsd4_cstate_assign_replay(cstate, so);
5176 nfs4_put_stateowner(so);
5179 kmem_cache_free(file_slab, open->op_file);
5181 nfs4_put_stid(&open->op_stp->st_stid);
5182 if (open->op_odstate)
5183 kmem_cache_free(odstate_slab, open->op_odstate);
5187 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5188 union nfsd4_op_u *u)
5190 clientid_t *clid = &u->renew;
5191 struct nfs4_client *clp;
5193 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5195 dprintk("process_renew(%08x/%08x): starting\n",
5196 clid->cl_boot, clid->cl_id);
5197 status = lookup_clientid(clid, cstate, nn, false);
5201 status = nfserr_cb_path_down;
5202 if (!list_empty(&clp->cl_delegations)
5203 && clp->cl_cb_state != NFSD4_CB_UP)
5211 nfsd4_end_grace(struct nfsd_net *nn)
5213 /* do nothing if grace period already ended */
5214 if (nn->grace_ended)
5217 nn->grace_ended = true;
5219 * If the server goes down again right now, an NFSv4
5220 * client will still be allowed to reclaim after it comes back up,
5221 * even if it hasn't yet had a chance to reclaim state this time.
5224 nfsd4_record_grace_done(nn);
5226 * At this point, NFSv4 clients can still reclaim. But if the
5227 * server crashes, any that have not yet reclaimed will be out
5228 * of luck on the next boot.
5230 * (NFSv4.1+ clients are considered to have reclaimed once they
5231 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
5232 * have reclaimed after their first OPEN.)
5234 locks_end_grace(&nn->nfsd4_manager);
5236 * At this point, and once lockd and/or any other containers
5237 * exit their grace period, further reclaims will fail and
5238 * regular locking can resume.
5243 * If we've waited a lease period but there are still clients trying to
5244 * reclaim, wait a little longer to give them a chance to finish.
5246 static bool clients_still_reclaiming(struct nfsd_net *nn)
5248 time64_t double_grace_period_end = nn->boot_time +
5249 2 * nn->nfsd4_lease;
5251 if (nn->track_reclaim_completes &&
5252 atomic_read(&nn->nr_reclaim_complete) ==
5253 nn->reclaim_str_hashtbl_size)
5255 if (!nn->somebody_reclaimed)
5257 nn->somebody_reclaimed = false;
5259 * If we've given them *two* lease times to reclaim, and they're
5260 * still not done, give up:
5262 if (ktime_get_boottime_seconds() > double_grace_period_end)
5268 nfs4_laundromat(struct nfsd_net *nn)
5270 struct nfs4_client *clp;
5271 struct nfs4_openowner *oo;
5272 struct nfs4_delegation *dp;
5273 struct nfs4_ol_stateid *stp;
5274 struct nfsd4_blocked_lock *nbl;
5275 struct list_head *pos, *next, reaplist;
5276 time64_t cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease;
5277 time64_t t, new_timeo = nn->nfsd4_lease;
5278 struct nfs4_cpntf_state *cps;
5279 copy_stateid_t *cps_t;
5282 dprintk("NFSD: laundromat service - starting\n");
5284 if (clients_still_reclaiming(nn)) {
5288 dprintk("NFSD: end of grace period\n");
5289 nfsd4_end_grace(nn);
5290 INIT_LIST_HEAD(&reaplist);
5292 spin_lock(&nn->s2s_cp_lock);
5293 idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
5294 cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
5295 if (cps->cp_stateid.sc_type == NFS4_COPYNOTIFY_STID &&
5296 cps->cpntf_time > cutoff)
5297 _free_cpntf_state_locked(nn, cps);
5299 spin_unlock(&nn->s2s_cp_lock);
5301 spin_lock(&nn->client_lock);
5302 list_for_each_safe(pos, next, &nn->client_lru) {
5303 clp = list_entry(pos, struct nfs4_client, cl_lru);
5304 if (clp->cl_time > cutoff) {
5305 t = clp->cl_time - cutoff;
5306 new_timeo = min(new_timeo, t);
5309 if (mark_client_expired_locked(clp)) {
5310 dprintk("NFSD: client in use (clientid %08x)\n",
5311 clp->cl_clientid.cl_id);
5314 list_add(&clp->cl_lru, &reaplist);
5316 spin_unlock(&nn->client_lock);
5317 list_for_each_safe(pos, next, &reaplist) {
5318 clp = list_entry(pos, struct nfs4_client, cl_lru);
5319 dprintk("NFSD: purging unused client (clientid %08x)\n",
5320 clp->cl_clientid.cl_id);
5321 list_del_init(&clp->cl_lru);
5324 spin_lock(&state_lock);
5325 list_for_each_safe(pos, next, &nn->del_recall_lru) {
5326 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
5327 if (dp->dl_time > cutoff) {
5328 t = dp->dl_time - cutoff;
5329 new_timeo = min(new_timeo, t);
5332 WARN_ON(!unhash_delegation_locked(dp));
5333 list_add(&dp->dl_recall_lru, &reaplist);
5335 spin_unlock(&state_lock);
5336 while (!list_empty(&reaplist)) {
5337 dp = list_first_entry(&reaplist, struct nfs4_delegation,
5339 list_del_init(&dp->dl_recall_lru);
5340 revoke_delegation(dp);
5343 spin_lock(&nn->client_lock);
5344 while (!list_empty(&nn->close_lru)) {
5345 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
5347 if (oo->oo_time > cutoff) {
5348 t = oo->oo_time - cutoff;
5349 new_timeo = min(new_timeo, t);
5352 list_del_init(&oo->oo_close_lru);
5353 stp = oo->oo_last_closed_stid;
5354 oo->oo_last_closed_stid = NULL;
5355 spin_unlock(&nn->client_lock);
5356 nfs4_put_stid(&stp->st_stid);
5357 spin_lock(&nn->client_lock);
5359 spin_unlock(&nn->client_lock);
5362 * It's possible for a client to try and acquire an already held lock
5363 * that is being held for a long time, and then lose interest in it.
5364 * So, we clean out any un-revisited request after a lease period
5365 * under the assumption that the client is no longer interested.
5367 * RFC5661, sec. 9.6 states that the client must not rely on getting
5368 * notifications and must continue to poll for locks, even when the
5369 * server supports them. Thus this shouldn't lead to clients blocking
5370 * indefinitely once the lock does become free.
5372 BUG_ON(!list_empty(&reaplist));
5373 spin_lock(&nn->blocked_locks_lock);
5374 while (!list_empty(&nn->blocked_locks_lru)) {
5375 nbl = list_first_entry(&nn->blocked_locks_lru,
5376 struct nfsd4_blocked_lock, nbl_lru);
5377 if (nbl->nbl_time > cutoff) {
5378 t = nbl->nbl_time - cutoff;
5379 new_timeo = min(new_timeo, t);
5382 list_move(&nbl->nbl_lru, &reaplist);
5383 list_del_init(&nbl->nbl_list);
5385 spin_unlock(&nn->blocked_locks_lock);
5387 while (!list_empty(&reaplist)) {
5388 nbl = list_first_entry(&reaplist,
5389 struct nfsd4_blocked_lock, nbl_lru);
5390 list_del_init(&nbl->nbl_lru);
5391 free_blocked_lock(nbl);
5394 new_timeo = max_t(time64_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
5398 static struct workqueue_struct *laundry_wq;
5399 static void laundromat_main(struct work_struct *);
5402 laundromat_main(struct work_struct *laundry)
5405 struct delayed_work *dwork = to_delayed_work(laundry);
5406 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
5409 t = nfs4_laundromat(nn);
5410 dprintk("NFSD: laundromat_main - sleeping for %lld seconds\n", t);
5411 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
5414 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
5416 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
5417 return nfserr_bad_stateid;
5422 access_permit_read(struct nfs4_ol_stateid *stp)
5424 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
5425 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
5426 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
5430 access_permit_write(struct nfs4_ol_stateid *stp)
5432 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
5433 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
5437 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
5439 __be32 status = nfserr_openmode;
5441 /* For lock stateid's, we test the parent open, not the lock: */
5442 if (stp->st_openstp)
5443 stp = stp->st_openstp;
5444 if ((flags & WR_STATE) && !access_permit_write(stp))
5446 if ((flags & RD_STATE) && !access_permit_read(stp))
5453 static inline __be32
5454 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
5456 if (ONE_STATEID(stateid) && (flags & RD_STATE))
5458 else if (opens_in_grace(net)) {
5459 /* Answer in remaining cases depends on existence of
5460 * conflicting state; so we must wait out the grace period. */
5461 return nfserr_grace;
5462 } else if (flags & WR_STATE)
5463 return nfs4_share_conflict(current_fh,
5464 NFS4_SHARE_DENY_WRITE);
5465 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
5466 return nfs4_share_conflict(current_fh,
5467 NFS4_SHARE_DENY_READ);
5471 * Allow READ/WRITE during grace period on recovered state only for files
5472 * that are not able to provide mandatory locking.
5475 grace_disallows_io(struct net *net, struct inode *inode)
5477 return opens_in_grace(net) && mandatory_lock(inode);
5480 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
5483 * When sessions are used the stateid generation number is ignored
5486 if (has_session && in->si_generation == 0)
5489 if (in->si_generation == ref->si_generation)
5492 /* If the client sends us a stateid from the future, it's buggy: */
5493 if (nfsd4_stateid_generation_after(in, ref))
5494 return nfserr_bad_stateid;
5496 * However, we could see a stateid from the past, even from a
5497 * non-buggy client. For example, if the client sends a lock
5498 * while some IO is outstanding, the lock may bump si_generation
5499 * while the IO is still in flight. The client could avoid that
5500 * situation by waiting for responses on all the IO requests,
5501 * but better performance may result in retrying IO that
5502 * receives an old_stateid error if requests are rarely
5503 * reordered in flight:
5505 return nfserr_old_stateid;
5508 static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
5512 spin_lock(&s->sc_lock);
5513 ret = nfsd4_verify_open_stid(s);
5515 ret = check_stateid_generation(in, &s->sc_stateid, has_session);
5516 spin_unlock(&s->sc_lock);
5520 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
5522 if (ols->st_stateowner->so_is_open_owner &&
5523 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
5524 return nfserr_bad_stateid;
5528 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
5530 struct nfs4_stid *s;
5531 __be32 status = nfserr_bad_stateid;
5533 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5534 CLOSE_STATEID(stateid))
5536 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid))
5538 spin_lock(&cl->cl_lock);
5539 s = find_stateid_locked(cl, stateid);
5542 status = nfsd4_stid_check_stateid_generation(stateid, s, 1);
5545 switch (s->sc_type) {
5546 case NFS4_DELEG_STID:
5549 case NFS4_REVOKED_DELEG_STID:
5550 status = nfserr_deleg_revoked;
5552 case NFS4_OPEN_STID:
5553 case NFS4_LOCK_STID:
5554 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
5557 printk("unknown stateid type %x\n", s->sc_type);
5559 case NFS4_CLOSED_STID:
5560 case NFS4_CLOSED_DELEG_STID:
5561 status = nfserr_bad_stateid;
5564 spin_unlock(&cl->cl_lock);
5569 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
5570 stateid_t *stateid, unsigned char typemask,
5571 struct nfs4_stid **s, struct nfsd_net *nn)
5574 bool return_revoked = false;
5577 * only return revoked delegations if explicitly asked.
5578 * otherwise we report revoked or bad_stateid status.
5580 if (typemask & NFS4_REVOKED_DELEG_STID)
5581 return_revoked = true;
5582 else if (typemask & NFS4_DELEG_STID)
5583 typemask |= NFS4_REVOKED_DELEG_STID;
5585 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
5586 CLOSE_STATEID(stateid))
5587 return nfserr_bad_stateid;
5588 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn,
5590 if (status == nfserr_stale_clientid) {
5591 if (cstate->session)
5592 return nfserr_bad_stateid;
5593 return nfserr_stale_stateid;
5597 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
5599 return nfserr_bad_stateid;
5600 if (((*s)->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
5602 if (cstate->minorversion)
5603 return nfserr_deleg_revoked;
5604 return nfserr_bad_stateid;
5609 static struct nfsd_file *
5610 nfs4_find_file(struct nfs4_stid *s, int flags)
5615 switch (s->sc_type) {
5616 case NFS4_DELEG_STID:
5617 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
5619 return nfsd_file_get(s->sc_file->fi_deleg_file);
5620 case NFS4_OPEN_STID:
5621 case NFS4_LOCK_STID:
5622 if (flags & RD_STATE)
5623 return find_readable_file(s->sc_file);
5625 return find_writeable_file(s->sc_file);
5633 nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
5637 status = nfsd4_check_openowner_confirmed(ols);
5640 return nfs4_check_openmode(ols, flags);
5644 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
5645 struct nfsd_file **nfp, int flags)
5647 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
5648 struct nfsd_file *nf;
5651 nf = nfs4_find_file(s, flags);
5653 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
5654 acc | NFSD_MAY_OWNER_OVERRIDE);
5660 status = nfsd_file_acquire(rqstp, fhp, acc, &nf);
5669 _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
5671 WARN_ON_ONCE(cps->cp_stateid.sc_type != NFS4_COPYNOTIFY_STID);
5672 if (!refcount_dec_and_test(&cps->cp_stateid.sc_count))
5674 list_del(&cps->cp_list);
5675 idr_remove(&nn->s2s_cp_stateids,
5676 cps->cp_stateid.stid.si_opaque.so_id);
5680 * A READ from an inter server to server COPY will have a
5681 * copy stateid. Look up the copy notify stateid from the
5682 * idr structure and take a reference on it.
5684 __be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
5685 struct nfs4_client *clp,
5686 struct nfs4_cpntf_state **cps)
5688 copy_stateid_t *cps_t;
5689 struct nfs4_cpntf_state *state = NULL;
5691 if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
5692 return nfserr_bad_stateid;
5693 spin_lock(&nn->s2s_cp_lock);
5694 cps_t = idr_find(&nn->s2s_cp_stateids, st->si_opaque.so_id);
5696 state = container_of(cps_t, struct nfs4_cpntf_state,
5698 if (state->cp_stateid.sc_type != NFS4_COPYNOTIFY_STID) {
5703 refcount_inc(&state->cp_stateid.sc_count);
5705 _free_cpntf_state_locked(nn, state);
5708 spin_unlock(&nn->s2s_cp_lock);
5710 return nfserr_bad_stateid;
5716 static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
5717 struct nfs4_stid **stid)
5720 struct nfs4_cpntf_state *cps = NULL;
5721 struct nfsd4_compound_state cstate;
5723 status = manage_cpntf_state(nn, st, NULL, &cps);
5727 cps->cpntf_time = ktime_get_boottime_seconds();
5728 memset(&cstate, 0, sizeof(cstate));
5729 status = lookup_clientid(&cps->cp_p_clid, &cstate, nn, true);
5732 status = nfsd4_lookup_stateid(&cstate, &cps->cp_p_stateid,
5733 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5735 put_client_renew(cstate.clp);
5737 nfs4_put_cpntf_state(nn, cps);
5741 void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
5743 spin_lock(&nn->s2s_cp_lock);
5744 _free_cpntf_state_locked(nn, cps);
5745 spin_unlock(&nn->s2s_cp_lock);
5749 * Checks for stateid operations
5752 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
5753 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
5754 stateid_t *stateid, int flags, struct nfsd_file **nfp,
5755 struct nfs4_stid **cstid)
5757 struct inode *ino = d_inode(fhp->fh_dentry);
5758 struct net *net = SVC_NET(rqstp);
5759 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5760 struct nfs4_stid *s = NULL;
5766 if (grace_disallows_io(net, ino))
5767 return nfserr_grace;
5769 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
5770 status = check_special_stateids(net, fhp, stateid, flags);
5774 status = nfsd4_lookup_stateid(cstate, stateid,
5775 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
5777 if (status == nfserr_bad_stateid)
5778 status = find_cpntf_state(nn, stateid, &s);
5781 status = nfsd4_stid_check_stateid_generation(stateid, s,
5782 nfsd4_has_session(cstate));
5786 switch (s->sc_type) {
5787 case NFS4_DELEG_STID:
5788 status = nfs4_check_delegmode(delegstateid(s), flags);
5790 case NFS4_OPEN_STID:
5791 case NFS4_LOCK_STID:
5792 status = nfs4_check_olstateid(openlockstateid(s), flags);
5795 status = nfserr_bad_stateid;
5800 status = nfs4_check_fh(fhp, s);
5803 if (status == nfs_ok && nfp)
5804 status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
5807 if (!status && cstid)
5816 * Test if the stateid is valid
5819 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5820 union nfsd4_op_u *u)
5822 struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
5823 struct nfsd4_test_stateid_id *stateid;
5824 struct nfs4_client *cl = cstate->session->se_client;
5826 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5827 stateid->ts_id_status =
5828 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5834 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5836 struct nfs4_ol_stateid *stp = openlockstateid(s);
5839 ret = nfsd4_lock_ol_stateid(stp);
5843 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5847 ret = nfserr_locks_held;
5848 if (check_for_locks(stp->st_stid.sc_file,
5849 lockowner(stp->st_stateowner)))
5852 release_lock_stateid(stp);
5856 mutex_unlock(&stp->st_mutex);
5863 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5864 union nfsd4_op_u *u)
5866 struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
5867 stateid_t *stateid = &free_stateid->fr_stateid;
5868 struct nfs4_stid *s;
5869 struct nfs4_delegation *dp;
5870 struct nfs4_client *cl = cstate->session->se_client;
5871 __be32 ret = nfserr_bad_stateid;
5873 spin_lock(&cl->cl_lock);
5874 s = find_stateid_locked(cl, stateid);
5877 spin_lock(&s->sc_lock);
5878 switch (s->sc_type) {
5879 case NFS4_DELEG_STID:
5880 ret = nfserr_locks_held;
5882 case NFS4_OPEN_STID:
5883 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5886 ret = nfserr_locks_held;
5888 case NFS4_LOCK_STID:
5889 spin_unlock(&s->sc_lock);
5890 refcount_inc(&s->sc_count);
5891 spin_unlock(&cl->cl_lock);
5892 ret = nfsd4_free_lock_stateid(stateid, s);
5894 case NFS4_REVOKED_DELEG_STID:
5895 spin_unlock(&s->sc_lock);
5896 dp = delegstateid(s);
5897 list_del_init(&dp->dl_recall_lru);
5898 spin_unlock(&cl->cl_lock);
5902 /* Default falls through and returns nfserr_bad_stateid */
5904 spin_unlock(&s->sc_lock);
5906 spin_unlock(&cl->cl_lock);
5914 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5915 RD_STATE : WR_STATE;
5918 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5920 struct svc_fh *current_fh = &cstate->current_fh;
5921 struct nfs4_stateowner *sop = stp->st_stateowner;
5924 status = nfsd4_check_seqid(cstate, sop, seqid);
5927 status = nfsd4_lock_ol_stateid(stp);
5928 if (status != nfs_ok)
5930 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5931 if (status == nfs_ok)
5932 status = nfs4_check_fh(current_fh, &stp->st_stid);
5933 if (status != nfs_ok)
5934 mutex_unlock(&stp->st_mutex);
5939 * Checks for sequence id mutating operations.
5942 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5943 stateid_t *stateid, char typemask,
5944 struct nfs4_ol_stateid **stpp,
5945 struct nfsd_net *nn)
5948 struct nfs4_stid *s;
5949 struct nfs4_ol_stateid *stp = NULL;
5951 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5952 seqid, STATEID_VAL(stateid));
5955 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5958 stp = openlockstateid(s);
5959 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5961 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5965 nfs4_put_stid(&stp->st_stid);
5969 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5970 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5973 struct nfs4_openowner *oo;
5974 struct nfs4_ol_stateid *stp;
5976 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5977 NFS4_OPEN_STID, &stp, nn);
5980 oo = openowner(stp->st_stateowner);
5981 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5982 mutex_unlock(&stp->st_mutex);
5983 nfs4_put_stid(&stp->st_stid);
5984 return nfserr_bad_stateid;
5991 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5992 union nfsd4_op_u *u)
5994 struct nfsd4_open_confirm *oc = &u->open_confirm;
5996 struct nfs4_openowner *oo;
5997 struct nfs4_ol_stateid *stp;
5998 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6000 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
6001 cstate->current_fh.fh_dentry);
6003 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
6007 status = nfs4_preprocess_seqid_op(cstate,
6008 oc->oc_seqid, &oc->oc_req_stateid,
6009 NFS4_OPEN_STID, &stp, nn);
6012 oo = openowner(stp->st_stateowner);
6013 status = nfserr_bad_stateid;
6014 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
6015 mutex_unlock(&stp->st_mutex);
6018 oo->oo_flags |= NFS4_OO_CONFIRMED;
6019 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
6020 mutex_unlock(&stp->st_mutex);
6021 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
6022 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
6024 nfsd4_client_record_create(oo->oo_owner.so_client);
6027 nfs4_put_stid(&stp->st_stid);
6029 nfsd4_bump_seqid(cstate, status);
6033 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
6035 if (!test_access(access, stp))
6037 nfs4_file_put_access(stp->st_stid.sc_file, access);
6038 clear_access(access, stp);
6041 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
6043 switch (to_access) {
6044 case NFS4_SHARE_ACCESS_READ:
6045 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
6046 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6048 case NFS4_SHARE_ACCESS_WRITE:
6049 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
6050 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
6052 case NFS4_SHARE_ACCESS_BOTH:
6060 nfsd4_open_downgrade(struct svc_rqst *rqstp,
6061 struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
6063 struct nfsd4_open_downgrade *od = &u->open_downgrade;
6065 struct nfs4_ol_stateid *stp;
6066 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6068 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
6069 cstate->current_fh.fh_dentry);
6071 /* We don't yet support WANT bits: */
6072 if (od->od_deleg_want)
6073 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
6076 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
6077 &od->od_stateid, &stp, nn);
6080 status = nfserr_inval;
6081 if (!test_access(od->od_share_access, stp)) {
6082 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
6083 stp->st_access_bmap, od->od_share_access);
6086 if (!test_deny(od->od_share_deny, stp)) {
6087 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
6088 stp->st_deny_bmap, od->od_share_deny);
6091 nfs4_stateid_downgrade(stp, od->od_share_access);
6092 reset_union_bmap_deny(od->od_share_deny, stp);
6093 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
6096 mutex_unlock(&stp->st_mutex);
6097 nfs4_put_stid(&stp->st_stid);
6099 nfsd4_bump_seqid(cstate, status);
6103 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
6105 struct nfs4_client *clp = s->st_stid.sc_client;
6107 LIST_HEAD(reaplist);
6109 spin_lock(&clp->cl_lock);
6110 unhashed = unhash_open_stateid(s, &reaplist);
6112 if (clp->cl_minorversion) {
6114 put_ol_stateid_locked(s, &reaplist);
6115 spin_unlock(&clp->cl_lock);
6116 free_ol_stateid_reaplist(&reaplist);
6118 spin_unlock(&clp->cl_lock);
6119 free_ol_stateid_reaplist(&reaplist);
6121 move_to_close_lru(s, clp->net);
6126 * nfs4_unlock_state() called after encode
6129 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6130 union nfsd4_op_u *u)
6132 struct nfsd4_close *close = &u->close;
6134 struct nfs4_ol_stateid *stp;
6135 struct net *net = SVC_NET(rqstp);
6136 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6138 dprintk("NFSD: nfsd4_close on file %pd\n",
6139 cstate->current_fh.fh_dentry);
6141 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
6143 NFS4_OPEN_STID|NFS4_CLOSED_STID,
6145 nfsd4_bump_seqid(cstate, status);
6149 stp->st_stid.sc_type = NFS4_CLOSED_STID;
6152 * Technically we don't _really_ have to increment or copy it, since
6153 * it should just be gone after this operation and we clobber the
6154 * copied value below, but we continue to do so here just to ensure
6155 * that racing ops see that there was a state change.
6157 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
6159 nfsd4_close_open_stateid(stp);
6160 mutex_unlock(&stp->st_mutex);
6162 /* v4.1+ suggests that we send a special stateid in here, since the
6163 * clients should just ignore this anyway. Since this is not useful
6164 * for v4.0 clients either, we set it to the special close_stateid
6167 * See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
6169 memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
6171 /* put reference from nfs4_preprocess_seqid_op */
6172 nfs4_put_stid(&stp->st_stid);
6178 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6179 union nfsd4_op_u *u)
6181 struct nfsd4_delegreturn *dr = &u->delegreturn;
6182 struct nfs4_delegation *dp;
6183 stateid_t *stateid = &dr->dr_stateid;
6184 struct nfs4_stid *s;
6186 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6188 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6191 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
6194 dp = delegstateid(s);
6195 status = nfsd4_stid_check_stateid_generation(stateid, &dp->dl_stid, nfsd4_has_session(cstate));
6199 destroy_delegation(dp);
6201 nfs4_put_stid(&dp->dl_stid);
6207 end_offset(u64 start, u64 len)
6212 return end >= start ? end: NFS4_MAX_UINT64;
6215 /* last octet in a range */
6217 last_byte_offset(u64 start, u64 len)
6223 return end > start ? end - 1: NFS4_MAX_UINT64;
6227 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
6228 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
6229 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
6230 * locking, this prevents us from being completely protocol-compliant. The
6231 * real solution to this problem is to start using unsigned file offsets in
6232 * the VFS, but this is a very deep change!
6235 nfs4_transform_lock_offset(struct file_lock *lock)
6237 if (lock->fl_start < 0)
6238 lock->fl_start = OFFSET_MAX;
6239 if (lock->fl_end < 0)
6240 lock->fl_end = OFFSET_MAX;
6244 nfsd4_fl_get_owner(fl_owner_t owner)
6246 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6248 nfs4_get_stateowner(&lo->lo_owner);
6253 nfsd4_fl_put_owner(fl_owner_t owner)
6255 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
6258 nfs4_put_stateowner(&lo->lo_owner);
6262 nfsd4_lm_notify(struct file_lock *fl)
6264 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
6265 struct net *net = lo->lo_owner.so_client->net;
6266 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6267 struct nfsd4_blocked_lock *nbl = container_of(fl,
6268 struct nfsd4_blocked_lock, nbl_lock);
6271 /* An empty list means that something else is going to be using it */
6272 spin_lock(&nn->blocked_locks_lock);
6273 if (!list_empty(&nbl->nbl_list)) {
6274 list_del_init(&nbl->nbl_list);
6275 list_del_init(&nbl->nbl_lru);
6278 spin_unlock(&nn->blocked_locks_lock);
6281 nfsd4_run_cb(&nbl->nbl_cb);
6284 static const struct lock_manager_operations nfsd_posix_mng_ops = {
6285 .lm_notify = nfsd4_lm_notify,
6286 .lm_get_owner = nfsd4_fl_get_owner,
6287 .lm_put_owner = nfsd4_fl_put_owner,
6291 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
6293 struct nfs4_lockowner *lo;
6295 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
6296 lo = (struct nfs4_lockowner *) fl->fl_owner;
6297 xdr_netobj_dup(&deny->ld_owner, &lo->lo_owner.so_owner,
6299 if (!deny->ld_owner.data)
6300 /* We just don't care that much */
6302 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
6305 deny->ld_owner.len = 0;
6306 deny->ld_owner.data = NULL;
6307 deny->ld_clientid.cl_boot = 0;
6308 deny->ld_clientid.cl_id = 0;
6310 deny->ld_start = fl->fl_start;
6311 deny->ld_length = NFS4_MAX_UINT64;
6312 if (fl->fl_end != NFS4_MAX_UINT64)
6313 deny->ld_length = fl->fl_end - fl->fl_start + 1;
6314 deny->ld_type = NFS4_READ_LT;
6315 if (fl->fl_type != F_RDLCK)
6316 deny->ld_type = NFS4_WRITE_LT;
6319 static struct nfs4_lockowner *
6320 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
6322 unsigned int strhashval = ownerstr_hashval(owner);
6323 struct nfs4_stateowner *so;
6325 lockdep_assert_held(&clp->cl_lock);
6327 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
6329 if (so->so_is_open_owner)
6331 if (same_owner_str(so, owner))
6332 return lockowner(nfs4_get_stateowner(so));
6337 static struct nfs4_lockowner *
6338 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
6340 struct nfs4_lockowner *lo;
6342 spin_lock(&clp->cl_lock);
6343 lo = find_lockowner_str_locked(clp, owner);
6344 spin_unlock(&clp->cl_lock);
6348 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
6350 unhash_lockowner_locked(lockowner(sop));
6353 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
6355 struct nfs4_lockowner *lo = lockowner(sop);
6357 kmem_cache_free(lockowner_slab, lo);
6360 static const struct nfs4_stateowner_operations lockowner_ops = {
6361 .so_unhash = nfs4_unhash_lockowner,
6362 .so_free = nfs4_free_lockowner,
6366 * Alloc a lock owner structure.
6367 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
6370 * strhashval = ownerstr_hashval
6372 static struct nfs4_lockowner *
6373 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
6374 struct nfs4_ol_stateid *open_stp,
6375 struct nfsd4_lock *lock)
6377 struct nfs4_lockowner *lo, *ret;
6379 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
6382 INIT_LIST_HEAD(&lo->lo_blocked);
6383 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
6384 lo->lo_owner.so_is_open_owner = 0;
6385 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
6386 lo->lo_owner.so_ops = &lockowner_ops;
6387 spin_lock(&clp->cl_lock);
6388 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
6390 list_add(&lo->lo_owner.so_strhash,
6391 &clp->cl_ownerstr_hashtbl[strhashval]);
6394 nfs4_free_stateowner(&lo->lo_owner);
6396 spin_unlock(&clp->cl_lock);
6400 static struct nfs4_ol_stateid *
6401 find_lock_stateid(const struct nfs4_lockowner *lo,
6402 const struct nfs4_ol_stateid *ost)
6404 struct nfs4_ol_stateid *lst;
6406 lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
6408 /* If ost is not hashed, ost->st_locks will not be valid */
6409 if (!nfs4_ol_stateid_unhashed(ost))
6410 list_for_each_entry(lst, &ost->st_locks, st_locks) {
6411 if (lst->st_stateowner == &lo->lo_owner) {
6412 refcount_inc(&lst->st_stid.sc_count);
6419 static struct nfs4_ol_stateid *
6420 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
6421 struct nfs4_file *fp, struct inode *inode,
6422 struct nfs4_ol_stateid *open_stp)
6424 struct nfs4_client *clp = lo->lo_owner.so_client;
6425 struct nfs4_ol_stateid *retstp;
6427 mutex_init(&stp->st_mutex);
6428 mutex_lock_nested(&stp->st_mutex, OPEN_STATEID_MUTEX);
6430 spin_lock(&clp->cl_lock);
6431 if (nfs4_ol_stateid_unhashed(open_stp))
6433 retstp = find_lock_stateid(lo, open_stp);
6436 refcount_inc(&stp->st_stid.sc_count);
6437 stp->st_stid.sc_type = NFS4_LOCK_STID;
6438 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
6440 stp->st_stid.sc_file = fp;
6441 stp->st_access_bmap = 0;
6442 stp->st_deny_bmap = open_stp->st_deny_bmap;
6443 stp->st_openstp = open_stp;
6444 spin_lock(&fp->fi_lock);
6445 list_add(&stp->st_locks, &open_stp->st_locks);
6446 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
6447 list_add(&stp->st_perfile, &fp->fi_stateids);
6448 spin_unlock(&fp->fi_lock);
6449 spin_unlock(&clp->cl_lock);
6452 spin_unlock(&clp->cl_lock);
6453 if (nfsd4_lock_ol_stateid(retstp) != nfs_ok) {
6454 nfs4_put_stid(&retstp->st_stid);
6457 /* To keep mutex tracking happy */
6458 mutex_unlock(&stp->st_mutex);
6461 spin_unlock(&clp->cl_lock);
6462 mutex_unlock(&stp->st_mutex);
6466 static struct nfs4_ol_stateid *
6467 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
6468 struct inode *inode, struct nfs4_ol_stateid *ost,
6471 struct nfs4_stid *ns = NULL;
6472 struct nfs4_ol_stateid *lst;
6473 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6474 struct nfs4_client *clp = oo->oo_owner.so_client;
6477 spin_lock(&clp->cl_lock);
6478 lst = find_lock_stateid(lo, ost);
6479 spin_unlock(&clp->cl_lock);
6481 if (nfsd4_lock_ol_stateid(lst) == nfs_ok)
6483 nfs4_put_stid(&lst->st_stid);
6485 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
6489 lst = init_lock_stateid(openlockstateid(ns), lo, fi, inode, ost);
6490 if (lst == openlockstateid(ns))
6499 check_lock_length(u64 offset, u64 length)
6501 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
6502 (length > ~offset)));
6505 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
6507 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
6509 lockdep_assert_held(&fp->fi_lock);
6511 if (test_access(access, lock_stp))
6513 __nfs4_file_get_access(fp, access);
6514 set_access(access, lock_stp);
6518 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
6519 struct nfs4_ol_stateid *ost,
6520 struct nfsd4_lock *lock,
6521 struct nfs4_ol_stateid **plst, bool *new)
6524 struct nfs4_file *fi = ost->st_stid.sc_file;
6525 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
6526 struct nfs4_client *cl = oo->oo_owner.so_client;
6527 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
6528 struct nfs4_lockowner *lo;
6529 struct nfs4_ol_stateid *lst;
6530 unsigned int strhashval;
6532 lo = find_lockowner_str(cl, &lock->lk_new_owner);
6534 strhashval = ownerstr_hashval(&lock->lk_new_owner);
6535 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
6537 return nfserr_jukebox;
6539 /* with an existing lockowner, seqids must be the same */
6540 status = nfserr_bad_seqid;
6541 if (!cstate->minorversion &&
6542 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
6546 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
6548 status = nfserr_jukebox;
6555 nfs4_put_stateowner(&lo->lo_owner);
6563 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6564 union nfsd4_op_u *u)
6566 struct nfsd4_lock *lock = &u->lock;
6567 struct nfs4_openowner *open_sop = NULL;
6568 struct nfs4_lockowner *lock_sop = NULL;
6569 struct nfs4_ol_stateid *lock_stp = NULL;
6570 struct nfs4_ol_stateid *open_stp = NULL;
6571 struct nfs4_file *fp;
6572 struct nfsd_file *nf = NULL;
6573 struct nfsd4_blocked_lock *nbl = NULL;
6574 struct file_lock *file_lock = NULL;
6575 struct file_lock *conflock = NULL;
6580 unsigned char fl_type;
6581 unsigned int fl_flags = FL_POSIX;
6582 struct net *net = SVC_NET(rqstp);
6583 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6585 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
6586 (long long) lock->lk_offset,
6587 (long long) lock->lk_length);
6589 if (check_lock_length(lock->lk_offset, lock->lk_length))
6590 return nfserr_inval;
6592 if ((status = fh_verify(rqstp, &cstate->current_fh,
6593 S_IFREG, NFSD_MAY_LOCK))) {
6594 dprintk("NFSD: nfsd4_lock: permission denied!\n");
6598 if (lock->lk_is_new) {
6599 if (nfsd4_has_session(cstate))
6600 /* See rfc 5661 18.10.3: given clientid is ignored: */
6601 memcpy(&lock->lk_new_clientid,
6602 &cstate->session->se_client->cl_clientid,
6603 sizeof(clientid_t));
6605 status = nfserr_stale_clientid;
6606 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
6609 /* validate and update open stateid and open seqid */
6610 status = nfs4_preprocess_confirmed_seqid_op(cstate,
6611 lock->lk_new_open_seqid,
6612 &lock->lk_new_open_stateid,
6616 mutex_unlock(&open_stp->st_mutex);
6617 open_sop = openowner(open_stp->st_stateowner);
6618 status = nfserr_bad_stateid;
6619 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
6620 &lock->lk_new_clientid))
6622 status = lookup_or_create_lock_state(cstate, open_stp, lock,
6625 status = nfs4_preprocess_seqid_op(cstate,
6626 lock->lk_old_lock_seqid,
6627 &lock->lk_old_lock_stateid,
6628 NFS4_LOCK_STID, &lock_stp, nn);
6632 lock_sop = lockowner(lock_stp->st_stateowner);
6634 lkflg = setlkflg(lock->lk_type);
6635 status = nfs4_check_openmode(lock_stp, lkflg);
6639 status = nfserr_grace;
6640 if (locks_in_grace(net) && !lock->lk_reclaim)
6642 status = nfserr_no_grace;
6643 if (!locks_in_grace(net) && lock->lk_reclaim)
6646 fp = lock_stp->st_stid.sc_file;
6647 switch (lock->lk_type) {
6649 if (nfsd4_has_session(cstate))
6650 fl_flags |= FL_SLEEP;
6653 spin_lock(&fp->fi_lock);
6654 nf = find_readable_file_locked(fp);
6656 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
6657 spin_unlock(&fp->fi_lock);
6660 case NFS4_WRITEW_LT:
6661 if (nfsd4_has_session(cstate))
6662 fl_flags |= FL_SLEEP;
6665 spin_lock(&fp->fi_lock);
6666 nf = find_writeable_file_locked(fp);
6668 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
6669 spin_unlock(&fp->fi_lock);
6673 status = nfserr_inval;
6678 status = nfserr_openmode;
6682 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
6684 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
6685 status = nfserr_jukebox;
6689 file_lock = &nbl->nbl_lock;
6690 file_lock->fl_type = fl_type;
6691 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
6692 file_lock->fl_pid = current->tgid;
6693 file_lock->fl_file = nf->nf_file;
6694 file_lock->fl_flags = fl_flags;
6695 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6696 file_lock->fl_start = lock->lk_offset;
6697 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
6698 nfs4_transform_lock_offset(file_lock);
6700 conflock = locks_alloc_lock();
6702 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6703 status = nfserr_jukebox;
6707 if (fl_flags & FL_SLEEP) {
6708 nbl->nbl_time = ktime_get_boottime_seconds();
6709 spin_lock(&nn->blocked_locks_lock);
6710 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
6711 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
6712 spin_unlock(&nn->blocked_locks_lock);
6715 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
6717 case 0: /* success! */
6718 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
6720 if (lock->lk_reclaim)
6721 nn->somebody_reclaimed = true;
6723 case FILE_LOCK_DEFERRED:
6726 case -EAGAIN: /* conflock holds conflicting lock */
6727 status = nfserr_denied;
6728 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
6729 nfs4_set_lock_denied(conflock, &lock->lk_denied);
6732 status = nfserr_deadlock;
6735 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
6736 status = nfserrno(err);
6741 /* dequeue it if we queued it before */
6742 if (fl_flags & FL_SLEEP) {
6743 spin_lock(&nn->blocked_locks_lock);
6744 list_del_init(&nbl->nbl_list);
6745 list_del_init(&nbl->nbl_lru);
6746 spin_unlock(&nn->blocked_locks_lock);
6748 free_blocked_lock(nbl);
6753 /* Bump seqid manually if the 4.0 replay owner is openowner */
6754 if (cstate->replay_owner &&
6755 cstate->replay_owner != &lock_sop->lo_owner &&
6756 seqid_mutating_err(ntohl(status)))
6757 lock_sop->lo_owner.so_seqid++;
6760 * If this is a new, never-before-used stateid, and we are
6761 * returning an error, then just go ahead and release it.
6764 release_lock_stateid(lock_stp);
6766 mutex_unlock(&lock_stp->st_mutex);
6768 nfs4_put_stid(&lock_stp->st_stid);
6771 nfs4_put_stid(&open_stp->st_stid);
6772 nfsd4_bump_seqid(cstate, status);
6774 locks_free_lock(conflock);
6779 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
6780 * so we do a temporary open here just to get an open file to pass to
6781 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
6784 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
6786 struct nfsd_file *nf;
6787 __be32 err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, &nf);
6789 err = nfserrno(vfs_test_lock(nf->nf_file, lock));
6799 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6800 union nfsd4_op_u *u)
6802 struct nfsd4_lockt *lockt = &u->lockt;
6803 struct file_lock *file_lock = NULL;
6804 struct nfs4_lockowner *lo = NULL;
6806 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6808 if (locks_in_grace(SVC_NET(rqstp)))
6809 return nfserr_grace;
6811 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
6812 return nfserr_inval;
6814 if (!nfsd4_has_session(cstate)) {
6815 status = lookup_clientid(&lockt->lt_clientid, cstate, nn,
6821 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
6824 file_lock = locks_alloc_lock();
6826 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6827 status = nfserr_jukebox;
6831 switch (lockt->lt_type) {
6834 file_lock->fl_type = F_RDLCK;
6837 case NFS4_WRITEW_LT:
6838 file_lock->fl_type = F_WRLCK;
6841 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
6842 status = nfserr_inval;
6846 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6848 file_lock->fl_owner = (fl_owner_t)lo;
6849 file_lock->fl_pid = current->tgid;
6850 file_lock->fl_flags = FL_POSIX;
6852 file_lock->fl_start = lockt->lt_offset;
6853 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6855 nfs4_transform_lock_offset(file_lock);
6857 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6861 if (file_lock->fl_type != F_UNLCK) {
6862 status = nfserr_denied;
6863 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6867 nfs4_put_stateowner(&lo->lo_owner);
6869 locks_free_lock(file_lock);
6874 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6875 union nfsd4_op_u *u)
6877 struct nfsd4_locku *locku = &u->locku;
6878 struct nfs4_ol_stateid *stp;
6879 struct nfsd_file *nf = NULL;
6880 struct file_lock *file_lock = NULL;
6883 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6885 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6886 (long long) locku->lu_offset,
6887 (long long) locku->lu_length);
6889 if (check_lock_length(locku->lu_offset, locku->lu_length))
6890 return nfserr_inval;
6892 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6893 &locku->lu_stateid, NFS4_LOCK_STID,
6897 nf = find_any_file(stp->st_stid.sc_file);
6899 status = nfserr_lock_range;
6902 file_lock = locks_alloc_lock();
6904 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6905 status = nfserr_jukebox;
6909 file_lock->fl_type = F_UNLCK;
6910 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6911 file_lock->fl_pid = current->tgid;
6912 file_lock->fl_file = nf->nf_file;
6913 file_lock->fl_flags = FL_POSIX;
6914 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6915 file_lock->fl_start = locku->lu_offset;
6917 file_lock->fl_end = last_byte_offset(locku->lu_offset,
6919 nfs4_transform_lock_offset(file_lock);
6921 err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
6923 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6926 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6930 mutex_unlock(&stp->st_mutex);
6931 nfs4_put_stid(&stp->st_stid);
6933 nfsd4_bump_seqid(cstate, status);
6935 locks_free_lock(file_lock);
6939 status = nfserrno(err);
6945 * true: locks held by lockowner
6946 * false: no locks held by lockowner
6949 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6951 struct file_lock *fl;
6953 struct nfsd_file *nf = find_any_file(fp);
6954 struct inode *inode;
6955 struct file_lock_context *flctx;
6958 /* Any valid lock stateid should have some sort of access */
6963 inode = locks_inode(nf->nf_file);
6964 flctx = inode->i_flctx;
6966 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6967 spin_lock(&flctx->flc_lock);
6968 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6969 if (fl->fl_owner == (fl_owner_t)lowner) {
6974 spin_unlock(&flctx->flc_lock);
6981 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6982 struct nfsd4_compound_state *cstate,
6983 union nfsd4_op_u *u)
6985 struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
6986 clientid_t *clid = &rlockowner->rl_clientid;
6987 struct nfs4_stateowner *sop;
6988 struct nfs4_lockowner *lo = NULL;
6989 struct nfs4_ol_stateid *stp;
6990 struct xdr_netobj *owner = &rlockowner->rl_owner;
6991 unsigned int hashval = ownerstr_hashval(owner);
6993 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6994 struct nfs4_client *clp;
6995 LIST_HEAD (reaplist);
6997 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6998 clid->cl_boot, clid->cl_id);
7000 status = lookup_clientid(clid, cstate, nn, false);
7005 /* Find the matching lock stateowner */
7006 spin_lock(&clp->cl_lock);
7007 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
7010 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
7013 /* see if there are still any locks associated with it */
7014 lo = lockowner(sop);
7015 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
7016 if (check_for_locks(stp->st_stid.sc_file, lo)) {
7017 status = nfserr_locks_held;
7018 spin_unlock(&clp->cl_lock);
7023 nfs4_get_stateowner(sop);
7027 spin_unlock(&clp->cl_lock);
7031 unhash_lockowner_locked(lo);
7032 while (!list_empty(&lo->lo_owner.so_stateids)) {
7033 stp = list_first_entry(&lo->lo_owner.so_stateids,
7034 struct nfs4_ol_stateid,
7036 WARN_ON(!unhash_lock_stateid(stp));
7037 put_ol_stateid_locked(stp, &reaplist);
7039 spin_unlock(&clp->cl_lock);
7040 free_ol_stateid_reaplist(&reaplist);
7041 remove_blocked_locks(lo);
7042 nfs4_put_stateowner(&lo->lo_owner);
7047 static inline struct nfs4_client_reclaim *
7050 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
7054 nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
7056 struct nfs4_client_reclaim *crp;
7058 crp = nfsd4_find_reclaim_client(name, nn);
7059 return (crp && crp->cr_clp);
7063 * failure => all reset bets are off, nfserr_no_grace...
7065 * The caller is responsible for freeing name.data if NULL is returned (it
7066 * will be freed in nfs4_remove_reclaim_record in the normal case).
7068 struct nfs4_client_reclaim *
7069 nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
7070 struct nfsd_net *nn)
7072 unsigned int strhashval;
7073 struct nfs4_client_reclaim *crp;
7075 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", name.len, name.data);
7076 crp = alloc_reclaim();
7078 strhashval = clientstr_hashval(name);
7079 INIT_LIST_HEAD(&crp->cr_strhash);
7080 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
7081 crp->cr_name.data = name.data;
7082 crp->cr_name.len = name.len;
7083 crp->cr_princhash.data = princhash.data;
7084 crp->cr_princhash.len = princhash.len;
7086 nn->reclaim_str_hashtbl_size++;
7092 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
7094 list_del(&crp->cr_strhash);
7095 kfree(crp->cr_name.data);
7096 kfree(crp->cr_princhash.data);
7098 nn->reclaim_str_hashtbl_size--;
7102 nfs4_release_reclaim(struct nfsd_net *nn)
7104 struct nfs4_client_reclaim *crp = NULL;
7107 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7108 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
7109 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
7110 struct nfs4_client_reclaim, cr_strhash);
7111 nfs4_remove_reclaim_record(crp, nn);
7114 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
7118 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
7119 struct nfs4_client_reclaim *
7120 nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
7122 unsigned int strhashval;
7123 struct nfs4_client_reclaim *crp = NULL;
7125 dprintk("NFSD: nfs4_find_reclaim_client for name %.*s\n", name.len, name.data);
7127 strhashval = clientstr_hashval(name);
7128 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
7129 if (compare_blob(&crp->cr_name, &name) == 0) {
7137 * Called from OPEN. Look for clientid in reclaim list.
7140 nfs4_check_open_reclaim(clientid_t *clid,
7141 struct nfsd4_compound_state *cstate,
7142 struct nfsd_net *nn)
7146 /* find clientid in conf_id_hashtbl */
7147 status = lookup_clientid(clid, cstate, nn, false);
7149 return nfserr_reclaim_bad;
7151 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
7152 return nfserr_no_grace;
7154 if (nfsd4_client_record_check(cstate->clp))
7155 return nfserr_reclaim_bad;
7160 #ifdef CONFIG_NFSD_FAULT_INJECTION
7162 put_client(struct nfs4_client *clp)
7164 atomic_dec(&clp->cl_rpc_users);
7167 static struct nfs4_client *
7168 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
7170 struct nfs4_client *clp;
7171 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7174 if (!nfsd_netns_ready(nn))
7177 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7178 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
7185 nfsd_inject_print_clients(void)
7187 struct nfs4_client *clp;
7189 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7191 char buf[INET6_ADDRSTRLEN];
7193 if (!nfsd_netns_ready(nn))
7196 spin_lock(&nn->client_lock);
7197 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7198 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
7199 pr_info("NFS Client: %s\n", buf);
7202 spin_unlock(&nn->client_lock);
7208 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
7211 struct nfs4_client *clp;
7212 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7215 if (!nfsd_netns_ready(nn))
7218 spin_lock(&nn->client_lock);
7219 clp = nfsd_find_client(addr, addr_size);
7221 if (mark_client_expired_locked(clp) == nfs_ok)
7226 spin_unlock(&nn->client_lock);
7235 nfsd_inject_forget_clients(u64 max)
7238 struct nfs4_client *clp, *next;
7239 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7241 LIST_HEAD(reaplist);
7243 if (!nfsd_netns_ready(nn))
7246 spin_lock(&nn->client_lock);
7247 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7248 if (mark_client_expired_locked(clp) == nfs_ok) {
7249 list_add(&clp->cl_lru, &reaplist);
7250 if (max != 0 && ++count >= max)
7254 spin_unlock(&nn->client_lock);
7256 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
7262 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
7265 char buf[INET6_ADDRSTRLEN];
7266 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
7267 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
7271 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
7272 struct list_head *collect)
7274 struct nfs4_client *clp = lst->st_stid.sc_client;
7275 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7281 lockdep_assert_held(&nn->client_lock);
7282 atomic_inc(&clp->cl_rpc_users);
7283 list_add(&lst->st_locks, collect);
7286 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
7287 struct list_head *collect,
7288 bool (*func)(struct nfs4_ol_stateid *))
7290 struct nfs4_openowner *oop;
7291 struct nfs4_ol_stateid *stp, *st_next;
7292 struct nfs4_ol_stateid *lst, *lst_next;
7295 spin_lock(&clp->cl_lock);
7296 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
7297 list_for_each_entry_safe(stp, st_next,
7298 &oop->oo_owner.so_stateids, st_perstateowner) {
7299 list_for_each_entry_safe(lst, lst_next,
7300 &stp->st_locks, st_locks) {
7303 nfsd_inject_add_lock_to_list(lst,
7308 * Despite the fact that these functions deal
7309 * with 64-bit integers for "count", we must
7310 * ensure that it doesn't blow up the
7311 * clp->cl_rpc_users. Throw a warning if we
7312 * start to approach INT_MAX here.
7314 WARN_ON_ONCE(count == (INT_MAX / 2));
7321 spin_unlock(&clp->cl_lock);
7327 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
7330 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
7334 nfsd_print_client_locks(struct nfs4_client *clp)
7336 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
7337 nfsd_print_count(clp, count, "locked files");
7342 nfsd_inject_print_locks(void)
7344 struct nfs4_client *clp;
7346 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7349 if (!nfsd_netns_ready(nn))
7352 spin_lock(&nn->client_lock);
7353 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7354 count += nfsd_print_client_locks(clp);
7355 spin_unlock(&nn->client_lock);
7361 nfsd_reap_locks(struct list_head *reaplist)
7363 struct nfs4_client *clp;
7364 struct nfs4_ol_stateid *stp, *next;
7366 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
7367 list_del_init(&stp->st_locks);
7368 clp = stp->st_stid.sc_client;
7369 nfs4_put_stid(&stp->st_stid);
7375 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
7377 unsigned int count = 0;
7378 struct nfs4_client *clp;
7379 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7381 LIST_HEAD(reaplist);
7383 if (!nfsd_netns_ready(nn))
7386 spin_lock(&nn->client_lock);
7387 clp = nfsd_find_client(addr, addr_size);
7389 count = nfsd_collect_client_locks(clp, &reaplist, 0);
7390 spin_unlock(&nn->client_lock);
7391 nfsd_reap_locks(&reaplist);
7396 nfsd_inject_forget_locks(u64 max)
7399 struct nfs4_client *clp;
7400 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7402 LIST_HEAD(reaplist);
7404 if (!nfsd_netns_ready(nn))
7407 spin_lock(&nn->client_lock);
7408 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7409 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
7410 if (max != 0 && count >= max)
7413 spin_unlock(&nn->client_lock);
7414 nfsd_reap_locks(&reaplist);
7419 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
7420 struct list_head *collect,
7421 void (*func)(struct nfs4_openowner *))
7423 struct nfs4_openowner *oop, *next;
7424 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7428 lockdep_assert_held(&nn->client_lock);
7430 spin_lock(&clp->cl_lock);
7431 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
7435 atomic_inc(&clp->cl_rpc_users);
7436 list_add(&oop->oo_perclient, collect);
7441 * Despite the fact that these functions deal with
7442 * 64-bit integers for "count", we must ensure that
7443 * it doesn't blow up the clp->cl_rpc_users. Throw a
7444 * warning if we start to approach INT_MAX here.
7446 WARN_ON_ONCE(count == (INT_MAX / 2));
7450 spin_unlock(&clp->cl_lock);
7456 nfsd_print_client_openowners(struct nfs4_client *clp)
7458 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
7460 nfsd_print_count(clp, count, "openowners");
7465 nfsd_collect_client_openowners(struct nfs4_client *clp,
7466 struct list_head *collect, u64 max)
7468 return nfsd_foreach_client_openowner(clp, max, collect,
7469 unhash_openowner_locked);
7473 nfsd_inject_print_openowners(void)
7475 struct nfs4_client *clp;
7477 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7480 if (!nfsd_netns_ready(nn))
7483 spin_lock(&nn->client_lock);
7484 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7485 count += nfsd_print_client_openowners(clp);
7486 spin_unlock(&nn->client_lock);
7492 nfsd_reap_openowners(struct list_head *reaplist)
7494 struct nfs4_client *clp;
7495 struct nfs4_openowner *oop, *next;
7497 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
7498 list_del_init(&oop->oo_perclient);
7499 clp = oop->oo_owner.so_client;
7500 release_openowner(oop);
7506 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
7509 unsigned int count = 0;
7510 struct nfs4_client *clp;
7511 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7513 LIST_HEAD(reaplist);
7515 if (!nfsd_netns_ready(nn))
7518 spin_lock(&nn->client_lock);
7519 clp = nfsd_find_client(addr, addr_size);
7521 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
7522 spin_unlock(&nn->client_lock);
7523 nfsd_reap_openowners(&reaplist);
7528 nfsd_inject_forget_openowners(u64 max)
7531 struct nfs4_client *clp;
7532 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7534 LIST_HEAD(reaplist);
7536 if (!nfsd_netns_ready(nn))
7539 spin_lock(&nn->client_lock);
7540 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7541 count += nfsd_collect_client_openowners(clp, &reaplist,
7543 if (max != 0 && count >= max)
7546 spin_unlock(&nn->client_lock);
7547 nfsd_reap_openowners(&reaplist);
7551 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
7552 struct list_head *victims)
7554 struct nfs4_delegation *dp, *next;
7555 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7559 lockdep_assert_held(&nn->client_lock);
7561 spin_lock(&state_lock);
7562 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
7565 * It's not safe to mess with delegations that have a
7566 * non-zero dl_time. They might have already been broken
7567 * and could be processed by the laundromat outside of
7568 * the state_lock. Just leave them be.
7570 if (dp->dl_time != 0)
7573 atomic_inc(&clp->cl_rpc_users);
7574 WARN_ON(!unhash_delegation_locked(dp));
7575 list_add(&dp->dl_recall_lru, victims);
7579 * Despite the fact that these functions deal with
7580 * 64-bit integers for "count", we must ensure that
7581 * it doesn't blow up the clp->cl_rpc_users. Throw a
7582 * warning if we start to approach INT_MAX here.
7584 WARN_ON_ONCE(count == (INT_MAX / 2));
7588 spin_unlock(&state_lock);
7593 nfsd_print_client_delegations(struct nfs4_client *clp)
7595 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
7597 nfsd_print_count(clp, count, "delegations");
7602 nfsd_inject_print_delegations(void)
7604 struct nfs4_client *clp;
7606 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7609 if (!nfsd_netns_ready(nn))
7612 spin_lock(&nn->client_lock);
7613 list_for_each_entry(clp, &nn->client_lru, cl_lru)
7614 count += nfsd_print_client_delegations(clp);
7615 spin_unlock(&nn->client_lock);
7621 nfsd_forget_delegations(struct list_head *reaplist)
7623 struct nfs4_client *clp;
7624 struct nfs4_delegation *dp, *next;
7626 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7627 list_del_init(&dp->dl_recall_lru);
7628 clp = dp->dl_stid.sc_client;
7629 revoke_delegation(dp);
7635 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
7639 struct nfs4_client *clp;
7640 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7642 LIST_HEAD(reaplist);
7644 if (!nfsd_netns_ready(nn))
7647 spin_lock(&nn->client_lock);
7648 clp = nfsd_find_client(addr, addr_size);
7650 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7651 spin_unlock(&nn->client_lock);
7653 nfsd_forget_delegations(&reaplist);
7658 nfsd_inject_forget_delegations(u64 max)
7661 struct nfs4_client *clp;
7662 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7664 LIST_HEAD(reaplist);
7666 if (!nfsd_netns_ready(nn))
7669 spin_lock(&nn->client_lock);
7670 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
7671 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7672 if (max != 0 && count >= max)
7675 spin_unlock(&nn->client_lock);
7676 nfsd_forget_delegations(&reaplist);
7681 nfsd_recall_delegations(struct list_head *reaplist)
7683 struct nfs4_client *clp;
7684 struct nfs4_delegation *dp, *next;
7686 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
7687 list_del_init(&dp->dl_recall_lru);
7688 clp = dp->dl_stid.sc_client;
7690 * We skipped all entries that had a zero dl_time before,
7691 * so we can now reset the dl_time back to 0. If a delegation
7692 * break comes in now, then it won't make any difference since
7693 * we're recalling it either way.
7695 spin_lock(&state_lock);
7697 spin_unlock(&state_lock);
7698 nfsd_break_one_deleg(dp);
7704 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
7708 struct nfs4_client *clp;
7709 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7711 LIST_HEAD(reaplist);
7713 if (!nfsd_netns_ready(nn))
7716 spin_lock(&nn->client_lock);
7717 clp = nfsd_find_client(addr, addr_size);
7719 count = nfsd_find_all_delegations(clp, 0, &reaplist);
7720 spin_unlock(&nn->client_lock);
7722 nfsd_recall_delegations(&reaplist);
7727 nfsd_inject_recall_delegations(u64 max)
7730 struct nfs4_client *clp, *next;
7731 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
7733 LIST_HEAD(reaplist);
7735 if (!nfsd_netns_ready(nn))
7738 spin_lock(&nn->client_lock);
7739 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
7740 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
7741 if (max != 0 && ++count >= max)
7744 spin_unlock(&nn->client_lock);
7745 nfsd_recall_delegations(&reaplist);
7748 #endif /* CONFIG_NFSD_FAULT_INJECTION */
7751 * Since the lifetime of a delegation isn't limited to that of an open, a
7752 * client may quite reasonably hang on to a delegation as long as it has
7753 * the inode cached. This becomes an obvious problem the first time a
7754 * client's inode cache approaches the size of the server's total memory.
7756 * For now we avoid this problem by imposing a hard limit on the number
7757 * of delegations, which varies according to the server's memory size.
7760 set_max_delegations(void)
7763 * Allow at most 4 delegations per megabyte of RAM. Quick
7764 * estimates suggest that in the worst case (where every delegation
7765 * is for a different inode), a delegation could take about 1.5K,
7766 * giving a worst case usage of about 6% of memory.
7768 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
7771 static int nfs4_state_create_net(struct net *net)
7773 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7776 nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7777 sizeof(struct list_head),
7779 if (!nn->conf_id_hashtbl)
7781 nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
7782 sizeof(struct list_head),
7784 if (!nn->unconf_id_hashtbl)
7786 nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
7787 sizeof(struct list_head),
7789 if (!nn->sessionid_hashtbl)
7792 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7793 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
7794 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
7796 for (i = 0; i < SESSION_HASH_SIZE; i++)
7797 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
7798 nn->conf_name_tree = RB_ROOT;
7799 nn->unconf_name_tree = RB_ROOT;
7800 nn->boot_time = ktime_get_real_seconds();
7801 nn->grace_ended = false;
7802 nn->nfsd4_manager.block_opens = true;
7803 INIT_LIST_HEAD(&nn->nfsd4_manager.list);
7804 INIT_LIST_HEAD(&nn->client_lru);
7805 INIT_LIST_HEAD(&nn->close_lru);
7806 INIT_LIST_HEAD(&nn->del_recall_lru);
7807 spin_lock_init(&nn->client_lock);
7808 spin_lock_init(&nn->s2s_cp_lock);
7809 idr_init(&nn->s2s_cp_stateids);
7811 spin_lock_init(&nn->blocked_locks_lock);
7812 INIT_LIST_HEAD(&nn->blocked_locks_lru);
7814 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
7820 kfree(nn->unconf_id_hashtbl);
7822 kfree(nn->conf_id_hashtbl);
7828 nfs4_state_destroy_net(struct net *net)
7831 struct nfs4_client *clp = NULL;
7832 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7834 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7835 while (!list_empty(&nn->conf_id_hashtbl[i])) {
7836 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7837 destroy_client(clp);
7841 WARN_ON(!list_empty(&nn->blocked_locks_lru));
7843 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
7844 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
7845 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
7846 destroy_client(clp);
7850 kfree(nn->sessionid_hashtbl);
7851 kfree(nn->unconf_id_hashtbl);
7852 kfree(nn->conf_id_hashtbl);
7857 nfs4_state_start_net(struct net *net)
7859 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7862 ret = nfs4_state_create_net(net);
7865 locks_start_grace(net, &nn->nfsd4_manager);
7866 nfsd4_client_tracking_init(net);
7867 if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
7869 printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
7870 nn->nfsd4_grace, net->ns.inum);
7871 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7875 printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
7877 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_lease * HZ);
7878 nfsd4_end_grace(nn);
7882 /* initialization to perform when the nfsd service is started: */
7885 nfs4_state_start(void)
7889 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7890 if (laundry_wq == NULL) {
7894 ret = nfsd4_create_callback_queue();
7896 goto out_free_laundry;
7898 set_max_delegations();
7902 destroy_workqueue(laundry_wq);
7908 nfs4_state_shutdown_net(struct net *net)
7910 struct nfs4_delegation *dp = NULL;
7911 struct list_head *pos, *next, reaplist;
7912 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7914 cancel_delayed_work_sync(&nn->laundromat_work);
7915 locks_end_grace(&nn->nfsd4_manager);
7917 INIT_LIST_HEAD(&reaplist);
7918 spin_lock(&state_lock);
7919 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7920 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7921 WARN_ON(!unhash_delegation_locked(dp));
7922 list_add(&dp->dl_recall_lru, &reaplist);
7924 spin_unlock(&state_lock);
7925 list_for_each_safe(pos, next, &reaplist) {
7926 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7927 list_del_init(&dp->dl_recall_lru);
7928 destroy_unhashed_deleg(dp);
7931 nfsd4_client_tracking_exit(net);
7932 nfs4_state_destroy_net(net);
7936 nfs4_state_shutdown(void)
7938 destroy_workqueue(laundry_wq);
7939 nfsd4_destroy_callback_queue();
7943 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7945 if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
7946 CURRENT_STATEID(stateid))
7947 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7951 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7953 if (cstate->minorversion) {
7954 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7955 SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
7960 clear_current_stateid(struct nfsd4_compound_state *cstate)
7962 CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
7966 * functions to set current state id
7969 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
7970 union nfsd4_op_u *u)
7972 put_stateid(cstate, &u->open_downgrade.od_stateid);
7976 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
7977 union nfsd4_op_u *u)
7979 put_stateid(cstate, &u->open.op_stateid);
7983 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
7984 union nfsd4_op_u *u)
7986 put_stateid(cstate, &u->close.cl_stateid);
7990 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
7991 union nfsd4_op_u *u)
7993 put_stateid(cstate, &u->lock.lk_resp_stateid);
7997 * functions to consume current state id
8001 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8002 union nfsd4_op_u *u)
8004 get_stateid(cstate, &u->open_downgrade.od_stateid);
8008 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8009 union nfsd4_op_u *u)
8011 get_stateid(cstate, &u->delegreturn.dr_stateid);
8015 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8016 union nfsd4_op_u *u)
8018 get_stateid(cstate, &u->free_stateid.fr_stateid);
8022 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8023 union nfsd4_op_u *u)
8025 get_stateid(cstate, &u->setattr.sa_stateid);
8029 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8030 union nfsd4_op_u *u)
8032 get_stateid(cstate, &u->close.cl_stateid);
8036 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8037 union nfsd4_op_u *u)
8039 get_stateid(cstate, &u->locku.lu_stateid);
8043 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8044 union nfsd4_op_u *u)
8046 get_stateid(cstate, &u->read.rd_stateid);
8050 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8051 union nfsd4_op_u *u)
8053 get_stateid(cstate, &u->write.wr_stateid);