x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / fs / nfsd / nfs4state.c
blobe9ef50addddb4489534bc07f138cd8c321d9193d
1 /*
2 * Copyright (c) 2001 The Regents of the University of Michigan.
3 * All rights reserved.
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
10 * are met:
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>
36 #include <linux/fs.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 "xdr4.h"
46 #include "xdr4cb.h"
47 #include "vfs.h"
48 #include "current_stateid.h"
50 #include "netns.h"
51 #include "pnfs.h"
53 #define NFSDDBG_FACILITY NFSDDBG_PROC
55 #define all_ones {{~0,~0},~0}
56 static const stateid_t one_stateid = {
57 .si_generation = ~0,
58 .si_opaque = all_ones,
60 static const stateid_t zero_stateid = {
61 /* all fields zero */
63 static const stateid_t currentstateid = {
64 .si_generation = 1,
67 static u64 current_sessionid = 1;
69 #define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
70 #define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
71 #define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
73 /* forward declarations */
74 static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
75 static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
77 /* Locking: */
80 * Currently used for the del_recall_lru and file hash table. In an
81 * effort to decrease the scope of the client_mutex, this spinlock may
82 * eventually cover more:
84 static DEFINE_SPINLOCK(state_lock);
87 * A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
88 * the refcount on the open stateid to drop.
90 static DECLARE_WAIT_QUEUE_HEAD(close_wq);
92 static struct kmem_cache *openowner_slab;
93 static struct kmem_cache *lockowner_slab;
94 static struct kmem_cache *file_slab;
95 static struct kmem_cache *stateid_slab;
96 static struct kmem_cache *deleg_slab;
97 static struct kmem_cache *odstate_slab;
99 static void free_session(struct nfsd4_session *);
101 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
102 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
104 static bool is_session_dead(struct nfsd4_session *ses)
106 return ses->se_flags & NFS4_SESSION_DEAD;
109 static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
111 if (atomic_read(&ses->se_ref) > ref_held_by_me)
112 return nfserr_jukebox;
113 ses->se_flags |= NFS4_SESSION_DEAD;
114 return nfs_ok;
117 static bool is_client_expired(struct nfs4_client *clp)
119 return clp->cl_time == 0;
122 static __be32 get_client_locked(struct nfs4_client *clp)
124 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
126 lockdep_assert_held(&nn->client_lock);
128 if (is_client_expired(clp))
129 return nfserr_expired;
130 atomic_inc(&clp->cl_refcount);
131 return nfs_ok;
134 /* must be called under the client_lock */
135 static inline void
136 renew_client_locked(struct nfs4_client *clp)
138 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
140 if (is_client_expired(clp)) {
141 WARN_ON(1);
142 printk("%s: client (clientid %08x/%08x) already expired\n",
143 __func__,
144 clp->cl_clientid.cl_boot,
145 clp->cl_clientid.cl_id);
146 return;
149 dprintk("renewing client (clientid %08x/%08x)\n",
150 clp->cl_clientid.cl_boot,
151 clp->cl_clientid.cl_id);
152 list_move_tail(&clp->cl_lru, &nn->client_lru);
153 clp->cl_time = get_seconds();
156 static void put_client_renew_locked(struct nfs4_client *clp)
158 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
160 lockdep_assert_held(&nn->client_lock);
162 if (!atomic_dec_and_test(&clp->cl_refcount))
163 return;
164 if (!is_client_expired(clp))
165 renew_client_locked(clp);
168 static void put_client_renew(struct nfs4_client *clp)
170 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
172 if (!atomic_dec_and_lock(&clp->cl_refcount, &nn->client_lock))
173 return;
174 if (!is_client_expired(clp))
175 renew_client_locked(clp);
176 spin_unlock(&nn->client_lock);
179 static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
181 __be32 status;
183 if (is_session_dead(ses))
184 return nfserr_badsession;
185 status = get_client_locked(ses->se_client);
186 if (status)
187 return status;
188 atomic_inc(&ses->se_ref);
189 return nfs_ok;
192 static void nfsd4_put_session_locked(struct nfsd4_session *ses)
194 struct nfs4_client *clp = ses->se_client;
195 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
197 lockdep_assert_held(&nn->client_lock);
199 if (atomic_dec_and_test(&ses->se_ref) && is_session_dead(ses))
200 free_session(ses);
201 put_client_renew_locked(clp);
204 static void nfsd4_put_session(struct nfsd4_session *ses)
206 struct nfs4_client *clp = ses->se_client;
207 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
209 spin_lock(&nn->client_lock);
210 nfsd4_put_session_locked(ses);
211 spin_unlock(&nn->client_lock);
214 static struct nfsd4_blocked_lock *
215 find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
216 struct nfsd_net *nn)
218 struct nfsd4_blocked_lock *cur, *found = NULL;
220 spin_lock(&nn->blocked_locks_lock);
221 list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
222 if (fh_match(fh, &cur->nbl_fh)) {
223 list_del_init(&cur->nbl_list);
224 list_del_init(&cur->nbl_lru);
225 found = cur;
226 break;
229 spin_unlock(&nn->blocked_locks_lock);
230 if (found)
231 posix_unblock_lock(&found->nbl_lock);
232 return found;
235 static struct nfsd4_blocked_lock *
236 find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
237 struct nfsd_net *nn)
239 struct nfsd4_blocked_lock *nbl;
241 nbl = find_blocked_lock(lo, fh, nn);
242 if (!nbl) {
243 nbl= kmalloc(sizeof(*nbl), GFP_KERNEL);
244 if (nbl) {
245 fh_copy_shallow(&nbl->nbl_fh, fh);
246 locks_init_lock(&nbl->nbl_lock);
247 nfsd4_init_cb(&nbl->nbl_cb, lo->lo_owner.so_client,
248 &nfsd4_cb_notify_lock_ops,
249 NFSPROC4_CLNT_CB_NOTIFY_LOCK);
252 return nbl;
255 static void
256 free_blocked_lock(struct nfsd4_blocked_lock *nbl)
258 locks_release_private(&nbl->nbl_lock);
259 kfree(nbl);
262 static int
263 nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
266 * Since this is just an optimization, we don't try very hard if it
267 * turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
268 * just quit trying on anything else.
270 switch (task->tk_status) {
271 case -NFS4ERR_DELAY:
272 rpc_delay(task, 1 * HZ);
273 return 0;
274 default:
275 return 1;
279 static void
280 nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
282 struct nfsd4_blocked_lock *nbl = container_of(cb,
283 struct nfsd4_blocked_lock, nbl_cb);
285 free_blocked_lock(nbl);
288 static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
289 .done = nfsd4_cb_notify_lock_done,
290 .release = nfsd4_cb_notify_lock_release,
293 static inline struct nfs4_stateowner *
294 nfs4_get_stateowner(struct nfs4_stateowner *sop)
296 atomic_inc(&sop->so_count);
297 return sop;
300 static int
301 same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
303 return (sop->so_owner.len == owner->len) &&
304 0 == memcmp(sop->so_owner.data, owner->data, owner->len);
307 static struct nfs4_openowner *
308 find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
309 struct nfs4_client *clp)
311 struct nfs4_stateowner *so;
313 lockdep_assert_held(&clp->cl_lock);
315 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
316 so_strhash) {
317 if (!so->so_is_open_owner)
318 continue;
319 if (same_owner_str(so, &open->op_owner))
320 return openowner(nfs4_get_stateowner(so));
322 return NULL;
325 static struct nfs4_openowner *
326 find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
327 struct nfs4_client *clp)
329 struct nfs4_openowner *oo;
331 spin_lock(&clp->cl_lock);
332 oo = find_openstateowner_str_locked(hashval, open, clp);
333 spin_unlock(&clp->cl_lock);
334 return oo;
337 static inline u32
338 opaque_hashval(const void *ptr, int nbytes)
340 unsigned char *cptr = (unsigned char *) ptr;
342 u32 x = 0;
343 while (nbytes--) {
344 x *= 37;
345 x += *cptr++;
347 return x;
350 static void nfsd4_free_file_rcu(struct rcu_head *rcu)
352 struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
354 kmem_cache_free(file_slab, fp);
357 void
358 put_nfs4_file(struct nfs4_file *fi)
360 might_lock(&state_lock);
362 if (atomic_dec_and_lock(&fi->fi_ref, &state_lock)) {
363 hlist_del_rcu(&fi->fi_hash);
364 spin_unlock(&state_lock);
365 WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
366 WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
367 call_rcu(&fi->fi_rcu, nfsd4_free_file_rcu);
371 static struct file *
372 __nfs4_get_fd(struct nfs4_file *f, int oflag)
374 if (f->fi_fds[oflag])
375 return get_file(f->fi_fds[oflag]);
376 return NULL;
379 static struct file *
380 find_writeable_file_locked(struct nfs4_file *f)
382 struct file *ret;
384 lockdep_assert_held(&f->fi_lock);
386 ret = __nfs4_get_fd(f, O_WRONLY);
387 if (!ret)
388 ret = __nfs4_get_fd(f, O_RDWR);
389 return ret;
392 static struct file *
393 find_writeable_file(struct nfs4_file *f)
395 struct file *ret;
397 spin_lock(&f->fi_lock);
398 ret = find_writeable_file_locked(f);
399 spin_unlock(&f->fi_lock);
401 return ret;
404 static struct file *find_readable_file_locked(struct nfs4_file *f)
406 struct file *ret;
408 lockdep_assert_held(&f->fi_lock);
410 ret = __nfs4_get_fd(f, O_RDONLY);
411 if (!ret)
412 ret = __nfs4_get_fd(f, O_RDWR);
413 return ret;
416 static struct file *
417 find_readable_file(struct nfs4_file *f)
419 struct file *ret;
421 spin_lock(&f->fi_lock);
422 ret = find_readable_file_locked(f);
423 spin_unlock(&f->fi_lock);
425 return ret;
428 struct file *
429 find_any_file(struct nfs4_file *f)
431 struct file *ret;
433 spin_lock(&f->fi_lock);
434 ret = __nfs4_get_fd(f, O_RDWR);
435 if (!ret) {
436 ret = __nfs4_get_fd(f, O_WRONLY);
437 if (!ret)
438 ret = __nfs4_get_fd(f, O_RDONLY);
440 spin_unlock(&f->fi_lock);
441 return ret;
444 static atomic_long_t num_delegations;
445 unsigned long max_delegations;
448 * Open owner state (share locks)
451 /* hash tables for lock and open owners */
452 #define OWNER_HASH_BITS 8
453 #define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
454 #define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
456 static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
458 unsigned int ret;
460 ret = opaque_hashval(ownername->data, ownername->len);
461 return ret & OWNER_HASH_MASK;
464 /* hash table for nfs4_file */
465 #define FILE_HASH_BITS 8
466 #define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
468 static unsigned int nfsd_fh_hashval(struct knfsd_fh *fh)
470 return jhash2(fh->fh_base.fh_pad, XDR_QUADLEN(fh->fh_size), 0);
473 static unsigned int file_hashval(struct knfsd_fh *fh)
475 return nfsd_fh_hashval(fh) & (FILE_HASH_SIZE - 1);
478 static struct hlist_head file_hashtbl[FILE_HASH_SIZE];
480 static void
481 __nfs4_file_get_access(struct nfs4_file *fp, u32 access)
483 lockdep_assert_held(&fp->fi_lock);
485 if (access & NFS4_SHARE_ACCESS_WRITE)
486 atomic_inc(&fp->fi_access[O_WRONLY]);
487 if (access & NFS4_SHARE_ACCESS_READ)
488 atomic_inc(&fp->fi_access[O_RDONLY]);
491 static __be32
492 nfs4_file_get_access(struct nfs4_file *fp, u32 access)
494 lockdep_assert_held(&fp->fi_lock);
496 /* Does this access mode make sense? */
497 if (access & ~NFS4_SHARE_ACCESS_BOTH)
498 return nfserr_inval;
500 /* Does it conflict with a deny mode already set? */
501 if ((access & fp->fi_share_deny) != 0)
502 return nfserr_share_denied;
504 __nfs4_file_get_access(fp, access);
505 return nfs_ok;
508 static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
510 /* Common case is that there is no deny mode. */
511 if (deny) {
512 /* Does this deny mode make sense? */
513 if (deny & ~NFS4_SHARE_DENY_BOTH)
514 return nfserr_inval;
516 if ((deny & NFS4_SHARE_DENY_READ) &&
517 atomic_read(&fp->fi_access[O_RDONLY]))
518 return nfserr_share_denied;
520 if ((deny & NFS4_SHARE_DENY_WRITE) &&
521 atomic_read(&fp->fi_access[O_WRONLY]))
522 return nfserr_share_denied;
524 return nfs_ok;
527 static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
529 might_lock(&fp->fi_lock);
531 if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
532 struct file *f1 = NULL;
533 struct file *f2 = NULL;
535 swap(f1, fp->fi_fds[oflag]);
536 if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
537 swap(f2, fp->fi_fds[O_RDWR]);
538 spin_unlock(&fp->fi_lock);
539 if (f1)
540 fput(f1);
541 if (f2)
542 fput(f2);
546 static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
548 WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
550 if (access & NFS4_SHARE_ACCESS_WRITE)
551 __nfs4_file_put_access(fp, O_WRONLY);
552 if (access & NFS4_SHARE_ACCESS_READ)
553 __nfs4_file_put_access(fp, O_RDONLY);
557 * Allocate a new open/delegation state counter. This is needed for
558 * pNFS for proper return on close semantics.
560 * Note that we only allocate it for pNFS-enabled exports, otherwise
561 * all pointers to struct nfs4_clnt_odstate are always NULL.
563 static struct nfs4_clnt_odstate *
564 alloc_clnt_odstate(struct nfs4_client *clp)
566 struct nfs4_clnt_odstate *co;
568 co = kmem_cache_zalloc(odstate_slab, GFP_KERNEL);
569 if (co) {
570 co->co_client = clp;
571 atomic_set(&co->co_odcount, 1);
573 return co;
576 static void
577 hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
579 struct nfs4_file *fp = co->co_file;
581 lockdep_assert_held(&fp->fi_lock);
582 list_add(&co->co_perfile, &fp->fi_clnt_odstate);
585 static inline void
586 get_clnt_odstate(struct nfs4_clnt_odstate *co)
588 if (co)
589 atomic_inc(&co->co_odcount);
592 static void
593 put_clnt_odstate(struct nfs4_clnt_odstate *co)
595 struct nfs4_file *fp;
597 if (!co)
598 return;
600 fp = co->co_file;
601 if (atomic_dec_and_lock(&co->co_odcount, &fp->fi_lock)) {
602 list_del(&co->co_perfile);
603 spin_unlock(&fp->fi_lock);
605 nfsd4_return_all_file_layouts(co->co_client, fp);
606 kmem_cache_free(odstate_slab, co);
610 static struct nfs4_clnt_odstate *
611 find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
613 struct nfs4_clnt_odstate *co;
614 struct nfs4_client *cl;
616 if (!new)
617 return NULL;
619 cl = new->co_client;
621 spin_lock(&fp->fi_lock);
622 list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
623 if (co->co_client == cl) {
624 get_clnt_odstate(co);
625 goto out;
628 co = new;
629 co->co_file = fp;
630 hash_clnt_odstate_locked(new);
631 out:
632 spin_unlock(&fp->fi_lock);
633 return co;
636 struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
637 void (*sc_free)(struct nfs4_stid *))
639 struct nfs4_stid *stid;
640 int new_id;
642 stid = kmem_cache_zalloc(slab, GFP_KERNEL);
643 if (!stid)
644 return NULL;
646 idr_preload(GFP_KERNEL);
647 spin_lock(&cl->cl_lock);
648 new_id = idr_alloc_cyclic(&cl->cl_stateids, stid, 0, 0, GFP_NOWAIT);
649 spin_unlock(&cl->cl_lock);
650 idr_preload_end();
651 if (new_id < 0)
652 goto out_free;
654 stid->sc_free = sc_free;
655 stid->sc_client = cl;
656 stid->sc_stateid.si_opaque.so_id = new_id;
657 stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
658 /* Will be incremented before return to client: */
659 atomic_set(&stid->sc_count, 1);
660 spin_lock_init(&stid->sc_lock);
663 * It shouldn't be a problem to reuse an opaque stateid value.
664 * I don't think it is for 4.1. But with 4.0 I worry that, for
665 * example, a stray write retransmission could be accepted by
666 * the server when it should have been rejected. Therefore,
667 * adopt a trick from the sctp code to attempt to maximize the
668 * amount of time until an id is reused, by ensuring they always
669 * "increase" (mod INT_MAX):
671 return stid;
672 out_free:
673 kmem_cache_free(slab, stid);
674 return NULL;
677 static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
679 struct nfs4_stid *stid;
681 stid = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_ol_stateid);
682 if (!stid)
683 return NULL;
685 return openlockstateid(stid);
688 static void nfs4_free_deleg(struct nfs4_stid *stid)
690 kmem_cache_free(deleg_slab, stid);
691 atomic_long_dec(&num_delegations);
695 * When we recall a delegation, we should be careful not to hand it
696 * out again straight away.
697 * To ensure this we keep a pair of bloom filters ('new' and 'old')
698 * in which the filehandles of recalled delegations are "stored".
699 * If a filehandle appear in either filter, a delegation is blocked.
700 * When a delegation is recalled, the filehandle is stored in the "new"
701 * filter.
702 * Every 30 seconds we swap the filters and clear the "new" one,
703 * unless both are empty of course.
705 * Each filter is 256 bits. We hash the filehandle to 32bit and use the
706 * low 3 bytes as hash-table indices.
708 * 'blocked_delegations_lock', which is always taken in block_delegations(),
709 * is used to manage concurrent access. Testing does not need the lock
710 * except when swapping the two filters.
712 static DEFINE_SPINLOCK(blocked_delegations_lock);
713 static struct bloom_pair {
714 int entries, old_entries;
715 time_t swap_time;
716 int new; /* index into 'set' */
717 DECLARE_BITMAP(set[2], 256);
718 } blocked_delegations;
720 static int delegation_blocked(struct knfsd_fh *fh)
722 u32 hash;
723 struct bloom_pair *bd = &blocked_delegations;
725 if (bd->entries == 0)
726 return 0;
727 if (seconds_since_boot() - bd->swap_time > 30) {
728 spin_lock(&blocked_delegations_lock);
729 if (seconds_since_boot() - bd->swap_time > 30) {
730 bd->entries -= bd->old_entries;
731 bd->old_entries = bd->entries;
732 memset(bd->set[bd->new], 0,
733 sizeof(bd->set[0]));
734 bd->new = 1-bd->new;
735 bd->swap_time = seconds_since_boot();
737 spin_unlock(&blocked_delegations_lock);
739 hash = jhash(&fh->fh_base, fh->fh_size, 0);
740 if (test_bit(hash&255, bd->set[0]) &&
741 test_bit((hash>>8)&255, bd->set[0]) &&
742 test_bit((hash>>16)&255, bd->set[0]))
743 return 1;
745 if (test_bit(hash&255, bd->set[1]) &&
746 test_bit((hash>>8)&255, bd->set[1]) &&
747 test_bit((hash>>16)&255, bd->set[1]))
748 return 1;
750 return 0;
753 static void block_delegations(struct knfsd_fh *fh)
755 u32 hash;
756 struct bloom_pair *bd = &blocked_delegations;
758 hash = jhash(&fh->fh_base, fh->fh_size, 0);
760 spin_lock(&blocked_delegations_lock);
761 __set_bit(hash&255, bd->set[bd->new]);
762 __set_bit((hash>>8)&255, bd->set[bd->new]);
763 __set_bit((hash>>16)&255, bd->set[bd->new]);
764 if (bd->entries == 0)
765 bd->swap_time = seconds_since_boot();
766 bd->entries += 1;
767 spin_unlock(&blocked_delegations_lock);
770 static struct nfs4_delegation *
771 alloc_init_deleg(struct nfs4_client *clp, struct svc_fh *current_fh,
772 struct nfs4_clnt_odstate *odstate)
774 struct nfs4_delegation *dp;
775 long n;
777 dprintk("NFSD alloc_init_deleg\n");
778 n = atomic_long_inc_return(&num_delegations);
779 if (n < 0 || n > max_delegations)
780 goto out_dec;
781 if (delegation_blocked(&current_fh->fh_handle))
782 goto out_dec;
783 dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab, nfs4_free_deleg));
784 if (dp == NULL)
785 goto out_dec;
788 * delegation seqid's are never incremented. The 4.1 special
789 * meaning of seqid 0 isn't meaningful, really, but let's avoid
790 * 0 anyway just for consistency and use 1:
792 dp->dl_stid.sc_stateid.si_generation = 1;
793 INIT_LIST_HEAD(&dp->dl_perfile);
794 INIT_LIST_HEAD(&dp->dl_perclnt);
795 INIT_LIST_HEAD(&dp->dl_recall_lru);
796 dp->dl_clnt_odstate = odstate;
797 get_clnt_odstate(odstate);
798 dp->dl_type = NFS4_OPEN_DELEGATE_READ;
799 dp->dl_retries = 1;
800 nfsd4_init_cb(&dp->dl_recall, dp->dl_stid.sc_client,
801 &nfsd4_cb_recall_ops, NFSPROC4_CLNT_CB_RECALL);
802 return dp;
803 out_dec:
804 atomic_long_dec(&num_delegations);
805 return NULL;
808 void
809 nfs4_put_stid(struct nfs4_stid *s)
811 struct nfs4_file *fp = s->sc_file;
812 struct nfs4_client *clp = s->sc_client;
814 might_lock(&clp->cl_lock);
816 if (!atomic_dec_and_lock(&s->sc_count, &clp->cl_lock)) {
817 wake_up_all(&close_wq);
818 return;
820 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
821 spin_unlock(&clp->cl_lock);
822 s->sc_free(s);
823 if (fp)
824 put_nfs4_file(fp);
827 void
828 nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
830 stateid_t *src = &stid->sc_stateid;
832 spin_lock(&stid->sc_lock);
833 if (unlikely(++src->si_generation == 0))
834 src->si_generation = 1;
835 memcpy(dst, src, sizeof(*dst));
836 spin_unlock(&stid->sc_lock);
839 static void nfs4_put_deleg_lease(struct nfs4_file *fp)
841 struct file *filp = NULL;
843 spin_lock(&fp->fi_lock);
844 if (fp->fi_deleg_file && --fp->fi_delegees == 0)
845 swap(filp, fp->fi_deleg_file);
846 spin_unlock(&fp->fi_lock);
848 if (filp) {
849 vfs_setlease(filp, F_UNLCK, NULL, (void **)&fp);
850 fput(filp);
854 void nfs4_unhash_stid(struct nfs4_stid *s)
856 s->sc_type = 0;
860 * nfs4_get_existing_delegation - Discover if this delegation already exists
861 * @clp: a pointer to the nfs4_client we're granting a delegation to
862 * @fp: a pointer to the nfs4_file we're granting a delegation on
864 * Return:
865 * On success: NULL if an existing delegation was not found.
867 * On error: -EAGAIN if one was previously granted to this nfs4_client
868 * for this nfs4_file.
872 static int
873 nfs4_get_existing_delegation(struct nfs4_client *clp, struct nfs4_file *fp)
875 struct nfs4_delegation *searchdp = NULL;
876 struct nfs4_client *searchclp = NULL;
878 lockdep_assert_held(&state_lock);
879 lockdep_assert_held(&fp->fi_lock);
881 list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
882 searchclp = searchdp->dl_stid.sc_client;
883 if (clp == searchclp) {
884 return -EAGAIN;
887 return 0;
891 * hash_delegation_locked - Add a delegation to the appropriate lists
892 * @dp: a pointer to the nfs4_delegation we are adding.
893 * @fp: a pointer to the nfs4_file we're granting a delegation on
895 * Return:
896 * On success: NULL if the delegation was successfully hashed.
898 * On error: -EAGAIN if one was previously granted to this
899 * nfs4_client for this nfs4_file. Delegation is not hashed.
903 static int
904 hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
906 int status;
907 struct nfs4_client *clp = dp->dl_stid.sc_client;
909 lockdep_assert_held(&state_lock);
910 lockdep_assert_held(&fp->fi_lock);
912 status = nfs4_get_existing_delegation(clp, fp);
913 if (status)
914 return status;
915 ++fp->fi_delegees;
916 atomic_inc(&dp->dl_stid.sc_count);
917 dp->dl_stid.sc_type = NFS4_DELEG_STID;
918 list_add(&dp->dl_perfile, &fp->fi_delegations);
919 list_add(&dp->dl_perclnt, &clp->cl_delegations);
920 return 0;
923 static bool
924 unhash_delegation_locked(struct nfs4_delegation *dp)
926 struct nfs4_file *fp = dp->dl_stid.sc_file;
928 lockdep_assert_held(&state_lock);
930 if (list_empty(&dp->dl_perfile))
931 return false;
933 dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
934 /* Ensure that deleg break won't try to requeue it */
935 ++dp->dl_time;
936 spin_lock(&fp->fi_lock);
937 list_del_init(&dp->dl_perclnt);
938 list_del_init(&dp->dl_recall_lru);
939 list_del_init(&dp->dl_perfile);
940 spin_unlock(&fp->fi_lock);
941 return true;
944 static void destroy_delegation(struct nfs4_delegation *dp)
946 bool unhashed;
948 spin_lock(&state_lock);
949 unhashed = unhash_delegation_locked(dp);
950 spin_unlock(&state_lock);
951 if (unhashed) {
952 put_clnt_odstate(dp->dl_clnt_odstate);
953 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
954 nfs4_put_stid(&dp->dl_stid);
958 static void revoke_delegation(struct nfs4_delegation *dp)
960 struct nfs4_client *clp = dp->dl_stid.sc_client;
962 WARN_ON(!list_empty(&dp->dl_recall_lru));
964 put_clnt_odstate(dp->dl_clnt_odstate);
965 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
967 if (clp->cl_minorversion == 0)
968 nfs4_put_stid(&dp->dl_stid);
969 else {
970 dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
971 spin_lock(&clp->cl_lock);
972 list_add(&dp->dl_recall_lru, &clp->cl_revoked);
973 spin_unlock(&clp->cl_lock);
978 * SETCLIENTID state
981 static unsigned int clientid_hashval(u32 id)
983 return id & CLIENT_HASH_MASK;
986 static unsigned int clientstr_hashval(const char *name)
988 return opaque_hashval(name, 8) & CLIENT_HASH_MASK;
992 * We store the NONE, READ, WRITE, and BOTH bits separately in the
993 * st_{access,deny}_bmap field of the stateid, in order to track not
994 * only what share bits are currently in force, but also what
995 * combinations of share bits previous opens have used. This allows us
996 * to enforce the recommendation of rfc 3530 14.2.19 that the server
997 * return an error if the client attempt to downgrade to a combination
998 * of share bits not explicable by closing some of its previous opens.
1000 * XXX: This enforcement is actually incomplete, since we don't keep
1001 * track of access/deny bit combinations; so, e.g., we allow:
1003 * OPEN allow read, deny write
1004 * OPEN allow both, deny none
1005 * DOWNGRADE allow read, deny none
1007 * which we should reject.
1009 static unsigned int
1010 bmap_to_share_mode(unsigned long bmap) {
1011 int i;
1012 unsigned int access = 0;
1014 for (i = 1; i < 4; i++) {
1015 if (test_bit(i, &bmap))
1016 access |= i;
1018 return access;
1021 /* set share access for a given stateid */
1022 static inline void
1023 set_access(u32 access, struct nfs4_ol_stateid *stp)
1025 unsigned char mask = 1 << access;
1027 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1028 stp->st_access_bmap |= mask;
1031 /* clear share access for a given stateid */
1032 static inline void
1033 clear_access(u32 access, struct nfs4_ol_stateid *stp)
1035 unsigned char mask = 1 << access;
1037 WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
1038 stp->st_access_bmap &= ~mask;
1041 /* test whether a given stateid has access */
1042 static inline bool
1043 test_access(u32 access, struct nfs4_ol_stateid *stp)
1045 unsigned char mask = 1 << access;
1047 return (bool)(stp->st_access_bmap & mask);
1050 /* set share deny for a given stateid */
1051 static inline void
1052 set_deny(u32 deny, struct nfs4_ol_stateid *stp)
1054 unsigned char mask = 1 << deny;
1056 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1057 stp->st_deny_bmap |= mask;
1060 /* clear share deny for a given stateid */
1061 static inline void
1062 clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
1064 unsigned char mask = 1 << deny;
1066 WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
1067 stp->st_deny_bmap &= ~mask;
1070 /* test whether a given stateid is denying specific access */
1071 static inline bool
1072 test_deny(u32 deny, struct nfs4_ol_stateid *stp)
1074 unsigned char mask = 1 << deny;
1076 return (bool)(stp->st_deny_bmap & mask);
1079 static int nfs4_access_to_omode(u32 access)
1081 switch (access & NFS4_SHARE_ACCESS_BOTH) {
1082 case NFS4_SHARE_ACCESS_READ:
1083 return O_RDONLY;
1084 case NFS4_SHARE_ACCESS_WRITE:
1085 return O_WRONLY;
1086 case NFS4_SHARE_ACCESS_BOTH:
1087 return O_RDWR;
1089 WARN_ON_ONCE(1);
1090 return O_RDONLY;
1094 * A stateid that had a deny mode associated with it is being released
1095 * or downgraded. Recalculate the deny mode on the file.
1097 static void
1098 recalculate_deny_mode(struct nfs4_file *fp)
1100 struct nfs4_ol_stateid *stp;
1102 spin_lock(&fp->fi_lock);
1103 fp->fi_share_deny = 0;
1104 list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1105 fp->fi_share_deny |= bmap_to_share_mode(stp->st_deny_bmap);
1106 spin_unlock(&fp->fi_lock);
1109 static void
1110 reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1112 int i;
1113 bool change = false;
1115 for (i = 1; i < 4; i++) {
1116 if ((i & deny) != i) {
1117 change = true;
1118 clear_deny(i, stp);
1122 /* Recalculate per-file deny mode if there was a change */
1123 if (change)
1124 recalculate_deny_mode(stp->st_stid.sc_file);
1127 /* release all access and file references for a given stateid */
1128 static void
1129 release_all_access(struct nfs4_ol_stateid *stp)
1131 int i;
1132 struct nfs4_file *fp = stp->st_stid.sc_file;
1134 if (fp && stp->st_deny_bmap != 0)
1135 recalculate_deny_mode(fp);
1137 for (i = 1; i < 4; i++) {
1138 if (test_access(i, stp))
1139 nfs4_file_put_access(stp->st_stid.sc_file, i);
1140 clear_access(i, stp);
1144 static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1146 kfree(sop->so_owner.data);
1147 sop->so_ops->so_free(sop);
1150 static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1152 struct nfs4_client *clp = sop->so_client;
1154 might_lock(&clp->cl_lock);
1156 if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1157 return;
1158 sop->so_ops->so_unhash(sop);
1159 spin_unlock(&clp->cl_lock);
1160 nfs4_free_stateowner(sop);
1163 static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1165 struct nfs4_file *fp = stp->st_stid.sc_file;
1167 lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1169 if (list_empty(&stp->st_perfile))
1170 return false;
1172 spin_lock(&fp->fi_lock);
1173 list_del_init(&stp->st_perfile);
1174 spin_unlock(&fp->fi_lock);
1175 list_del(&stp->st_perstateowner);
1176 return true;
1179 static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1181 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1183 put_clnt_odstate(stp->st_clnt_odstate);
1184 release_all_access(stp);
1185 if (stp->st_stateowner)
1186 nfs4_put_stateowner(stp->st_stateowner);
1187 kmem_cache_free(stateid_slab, stid);
1190 static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1192 struct nfs4_ol_stateid *stp = openlockstateid(stid);
1193 struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
1194 struct file *file;
1196 file = find_any_file(stp->st_stid.sc_file);
1197 if (file)
1198 filp_close(file, (fl_owner_t)lo);
1199 nfs4_free_ol_stateid(stid);
1203 * Put the persistent reference to an already unhashed generic stateid, while
1204 * holding the cl_lock. If it's the last reference, then put it onto the
1205 * reaplist for later destruction.
1207 static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1208 struct list_head *reaplist)
1210 struct nfs4_stid *s = &stp->st_stid;
1211 struct nfs4_client *clp = s->sc_client;
1213 lockdep_assert_held(&clp->cl_lock);
1215 WARN_ON_ONCE(!list_empty(&stp->st_locks));
1217 if (!atomic_dec_and_test(&s->sc_count)) {
1218 wake_up_all(&close_wq);
1219 return;
1222 idr_remove(&clp->cl_stateids, s->sc_stateid.si_opaque.so_id);
1223 list_add(&stp->st_locks, reaplist);
1226 static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1228 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1230 list_del_init(&stp->st_locks);
1231 nfs4_unhash_stid(&stp->st_stid);
1232 return unhash_ol_stateid(stp);
1235 static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1237 struct nfs4_client *clp = stp->st_stid.sc_client;
1238 bool unhashed;
1240 spin_lock(&clp->cl_lock);
1241 unhashed = unhash_lock_stateid(stp);
1242 spin_unlock(&clp->cl_lock);
1243 if (unhashed)
1244 nfs4_put_stid(&stp->st_stid);
1247 static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1249 struct nfs4_client *clp = lo->lo_owner.so_client;
1251 lockdep_assert_held(&clp->cl_lock);
1253 list_del_init(&lo->lo_owner.so_strhash);
1257 * Free a list of generic stateids that were collected earlier after being
1258 * fully unhashed.
1260 static void
1261 free_ol_stateid_reaplist(struct list_head *reaplist)
1263 struct nfs4_ol_stateid *stp;
1264 struct nfs4_file *fp;
1266 might_sleep();
1268 while (!list_empty(reaplist)) {
1269 stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1270 st_locks);
1271 list_del(&stp->st_locks);
1272 fp = stp->st_stid.sc_file;
1273 stp->st_stid.sc_free(&stp->st_stid);
1274 if (fp)
1275 put_nfs4_file(fp);
1279 static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1280 struct list_head *reaplist)
1282 struct nfs4_ol_stateid *stp;
1284 lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1286 while (!list_empty(&open_stp->st_locks)) {
1287 stp = list_entry(open_stp->st_locks.next,
1288 struct nfs4_ol_stateid, st_locks);
1289 WARN_ON(!unhash_lock_stateid(stp));
1290 put_ol_stateid_locked(stp, reaplist);
1294 static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1295 struct list_head *reaplist)
1297 bool unhashed;
1299 lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1301 unhashed = unhash_ol_stateid(stp);
1302 release_open_stateid_locks(stp, reaplist);
1303 return unhashed;
1306 static void release_open_stateid(struct nfs4_ol_stateid *stp)
1308 LIST_HEAD(reaplist);
1310 spin_lock(&stp->st_stid.sc_client->cl_lock);
1311 if (unhash_open_stateid(stp, &reaplist))
1312 put_ol_stateid_locked(stp, &reaplist);
1313 spin_unlock(&stp->st_stid.sc_client->cl_lock);
1314 free_ol_stateid_reaplist(&reaplist);
1317 static void unhash_openowner_locked(struct nfs4_openowner *oo)
1319 struct nfs4_client *clp = oo->oo_owner.so_client;
1321 lockdep_assert_held(&clp->cl_lock);
1323 list_del_init(&oo->oo_owner.so_strhash);
1324 list_del_init(&oo->oo_perclient);
1327 static void release_last_closed_stateid(struct nfs4_openowner *oo)
1329 struct nfsd_net *nn = net_generic(oo->oo_owner.so_client->net,
1330 nfsd_net_id);
1331 struct nfs4_ol_stateid *s;
1333 spin_lock(&nn->client_lock);
1334 s = oo->oo_last_closed_stid;
1335 if (s) {
1336 list_del_init(&oo->oo_close_lru);
1337 oo->oo_last_closed_stid = NULL;
1339 spin_unlock(&nn->client_lock);
1340 if (s)
1341 nfs4_put_stid(&s->st_stid);
1344 static void release_openowner(struct nfs4_openowner *oo)
1346 struct nfs4_ol_stateid *stp;
1347 struct nfs4_client *clp = oo->oo_owner.so_client;
1348 struct list_head reaplist;
1350 INIT_LIST_HEAD(&reaplist);
1352 spin_lock(&clp->cl_lock);
1353 unhash_openowner_locked(oo);
1354 while (!list_empty(&oo->oo_owner.so_stateids)) {
1355 stp = list_first_entry(&oo->oo_owner.so_stateids,
1356 struct nfs4_ol_stateid, st_perstateowner);
1357 if (unhash_open_stateid(stp, &reaplist))
1358 put_ol_stateid_locked(stp, &reaplist);
1360 spin_unlock(&clp->cl_lock);
1361 free_ol_stateid_reaplist(&reaplist);
1362 release_last_closed_stateid(oo);
1363 nfs4_put_stateowner(&oo->oo_owner);
1366 static inline int
1367 hash_sessionid(struct nfs4_sessionid *sessionid)
1369 struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1371 return sid->sequence % SESSION_HASH_SIZE;
1374 #ifdef CONFIG_SUNRPC_DEBUG
1375 static inline void
1376 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1378 u32 *ptr = (u32 *)(&sessionid->data[0]);
1379 dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1381 #else
1382 static inline void
1383 dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1386 #endif
1389 * Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1390 * won't be used for replay.
1392 void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1394 struct nfs4_stateowner *so = cstate->replay_owner;
1396 if (nfserr == nfserr_replay_me)
1397 return;
1399 if (!seqid_mutating_err(ntohl(nfserr))) {
1400 nfsd4_cstate_clear_replay(cstate);
1401 return;
1403 if (!so)
1404 return;
1405 if (so->so_is_open_owner)
1406 release_last_closed_stateid(openowner(so));
1407 so->so_seqid++;
1408 return;
1411 static void
1412 gen_sessionid(struct nfsd4_session *ses)
1414 struct nfs4_client *clp = ses->se_client;
1415 struct nfsd4_sessionid *sid;
1417 sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1418 sid->clientid = clp->cl_clientid;
1419 sid->sequence = current_sessionid++;
1420 sid->reserved = 0;
1424 * The protocol defines ca_maxresponssize_cached to include the size of
1425 * the rpc header, but all we need to cache is the data starting after
1426 * the end of the initial SEQUENCE operation--the rest we regenerate
1427 * each time. Therefore we can advertise a ca_maxresponssize_cached
1428 * value that is the number of bytes in our cache plus a few additional
1429 * bytes. In order to stay on the safe side, and not promise more than
1430 * we can cache, those additional bytes must be the minimum possible: 24
1431 * bytes of rpc header (xid through accept state, with AUTH_NULL
1432 * verifier), 12 for the compound header (with zero-length tag), and 44
1433 * for the SEQUENCE op response:
1435 #define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1437 static void
1438 free_session_slots(struct nfsd4_session *ses)
1440 int i;
1442 for (i = 0; i < ses->se_fchannel.maxreqs; i++)
1443 kfree(ses->se_slots[i]);
1447 * We don't actually need to cache the rpc and session headers, so we
1448 * can allocate a little less for each slot:
1450 static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1452 u32 size;
1454 if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1455 size = 0;
1456 else
1457 size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1458 return size + sizeof(struct nfsd4_slot);
1462 * XXX: If we run out of reserved DRC memory we could (up to a point)
1463 * re-negotiate active sessions and reduce their slot usage to make
1464 * room for new connections. For now we just fail the create session.
1466 static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca)
1468 u32 slotsize = slot_bytes(ca);
1469 u32 num = ca->maxreqs;
1470 int avail;
1472 spin_lock(&nfsd_drc_lock);
1473 avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION,
1474 nfsd_drc_max_mem - nfsd_drc_mem_used);
1475 num = min_t(int, num, avail / slotsize);
1476 nfsd_drc_mem_used += num * slotsize;
1477 spin_unlock(&nfsd_drc_lock);
1479 return num;
1482 static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1484 int slotsize = slot_bytes(ca);
1486 spin_lock(&nfsd_drc_lock);
1487 nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1488 spin_unlock(&nfsd_drc_lock);
1491 static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1492 struct nfsd4_channel_attrs *battrs)
1494 int numslots = fattrs->maxreqs;
1495 int slotsize = slot_bytes(fattrs);
1496 struct nfsd4_session *new;
1497 int mem, i;
1499 BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
1500 + sizeof(struct nfsd4_session) > PAGE_SIZE);
1501 mem = numslots * sizeof(struct nfsd4_slot *);
1503 new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
1504 if (!new)
1505 return NULL;
1506 /* allocate each struct nfsd4_slot and data cache in one piece */
1507 for (i = 0; i < numslots; i++) {
1508 new->se_slots[i] = kzalloc(slotsize, GFP_KERNEL);
1509 if (!new->se_slots[i])
1510 goto out_free;
1513 memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1514 memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1516 return new;
1517 out_free:
1518 while (i--)
1519 kfree(new->se_slots[i]);
1520 kfree(new);
1521 return NULL;
1524 static void free_conn(struct nfsd4_conn *c)
1526 svc_xprt_put(c->cn_xprt);
1527 kfree(c);
1530 static void nfsd4_conn_lost(struct svc_xpt_user *u)
1532 struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1533 struct nfs4_client *clp = c->cn_session->se_client;
1535 spin_lock(&clp->cl_lock);
1536 if (!list_empty(&c->cn_persession)) {
1537 list_del(&c->cn_persession);
1538 free_conn(c);
1540 nfsd4_probe_callback(clp);
1541 spin_unlock(&clp->cl_lock);
1544 static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1546 struct nfsd4_conn *conn;
1548 conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
1549 if (!conn)
1550 return NULL;
1551 svc_xprt_get(rqstp->rq_xprt);
1552 conn->cn_xprt = rqstp->rq_xprt;
1553 conn->cn_flags = flags;
1554 INIT_LIST_HEAD(&conn->cn_xpt_user.list);
1555 return conn;
1558 static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1560 conn->cn_session = ses;
1561 list_add(&conn->cn_persession, &ses->se_conns);
1564 static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1566 struct nfs4_client *clp = ses->se_client;
1568 spin_lock(&clp->cl_lock);
1569 __nfsd4_hash_conn(conn, ses);
1570 spin_unlock(&clp->cl_lock);
1573 static int nfsd4_register_conn(struct nfsd4_conn *conn)
1575 conn->cn_xpt_user.callback = nfsd4_conn_lost;
1576 return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
1579 static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1581 int ret;
1583 nfsd4_hash_conn(conn, ses);
1584 ret = nfsd4_register_conn(conn);
1585 if (ret)
1586 /* oops; xprt is already down: */
1587 nfsd4_conn_lost(&conn->cn_xpt_user);
1588 /* We may have gained or lost a callback channel: */
1589 nfsd4_probe_callback_sync(ses->se_client);
1592 static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1594 u32 dir = NFS4_CDFC4_FORE;
1596 if (cses->flags & SESSION4_BACK_CHAN)
1597 dir |= NFS4_CDFC4_BACK;
1598 return alloc_conn(rqstp, dir);
1601 /* must be called under client_lock */
1602 static void nfsd4_del_conns(struct nfsd4_session *s)
1604 struct nfs4_client *clp = s->se_client;
1605 struct nfsd4_conn *c;
1607 spin_lock(&clp->cl_lock);
1608 while (!list_empty(&s->se_conns)) {
1609 c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1610 list_del_init(&c->cn_persession);
1611 spin_unlock(&clp->cl_lock);
1613 unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
1614 free_conn(c);
1616 spin_lock(&clp->cl_lock);
1618 spin_unlock(&clp->cl_lock);
1621 static void __free_session(struct nfsd4_session *ses)
1623 free_session_slots(ses);
1624 kfree(ses);
1627 static void free_session(struct nfsd4_session *ses)
1629 nfsd4_del_conns(ses);
1630 nfsd4_put_drc_mem(&ses->se_fchannel);
1631 __free_session(ses);
1634 static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1636 int idx;
1637 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1639 new->se_client = clp;
1640 gen_sessionid(new);
1642 INIT_LIST_HEAD(&new->se_conns);
1644 new->se_cb_seq_nr = 1;
1645 new->se_flags = cses->flags;
1646 new->se_cb_prog = cses->callback_prog;
1647 new->se_cb_sec = cses->cb_sec;
1648 atomic_set(&new->se_ref, 0);
1649 idx = hash_sessionid(&new->se_sessionid);
1650 list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
1651 spin_lock(&clp->cl_lock);
1652 list_add(&new->se_perclnt, &clp->cl_sessions);
1653 spin_unlock(&clp->cl_lock);
1656 struct sockaddr *sa = svc_addr(rqstp);
1658 * This is a little silly; with sessions there's no real
1659 * use for the callback address. Use the peer address
1660 * as a reasonable default for now, but consider fixing
1661 * the rpc client not to require an address in the
1662 * future:
1664 rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
1665 clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
1669 /* caller must hold client_lock */
1670 static struct nfsd4_session *
1671 __find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
1673 struct nfsd4_session *elem;
1674 int idx;
1675 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1677 lockdep_assert_held(&nn->client_lock);
1679 dump_sessionid(__func__, sessionid);
1680 idx = hash_sessionid(sessionid);
1681 /* Search in the appropriate list */
1682 list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
1683 if (!memcmp(elem->se_sessionid.data, sessionid->data,
1684 NFS4_MAX_SESSIONID_LEN)) {
1685 return elem;
1689 dprintk("%s: session not found\n", __func__);
1690 return NULL;
1693 static struct nfsd4_session *
1694 find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
1695 __be32 *ret)
1697 struct nfsd4_session *session;
1698 __be32 status = nfserr_badsession;
1700 session = __find_in_sessionid_hashtbl(sessionid, net);
1701 if (!session)
1702 goto out;
1703 status = nfsd4_get_session_locked(session);
1704 if (status)
1705 session = NULL;
1706 out:
1707 *ret = status;
1708 return session;
1711 /* caller must hold client_lock */
1712 static void
1713 unhash_session(struct nfsd4_session *ses)
1715 struct nfs4_client *clp = ses->se_client;
1716 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1718 lockdep_assert_held(&nn->client_lock);
1720 list_del(&ses->se_hash);
1721 spin_lock(&ses->se_client->cl_lock);
1722 list_del(&ses->se_perclnt);
1723 spin_unlock(&ses->se_client->cl_lock);
1726 /* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
1727 static int
1728 STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
1731 * We're assuming the clid was not given out from a boot
1732 * precisely 2^32 (about 136 years) before this one. That seems
1733 * a safe assumption:
1735 if (clid->cl_boot == (u32)nn->boot_time)
1736 return 0;
1737 dprintk("NFSD stale clientid (%08x/%08x) boot_time %08lx\n",
1738 clid->cl_boot, clid->cl_id, nn->boot_time);
1739 return 1;
1743 * XXX Should we use a slab cache ?
1744 * This type of memory management is somewhat inefficient, but we use it
1745 * anyway since SETCLIENTID is not a common operation.
1747 static struct nfs4_client *alloc_client(struct xdr_netobj name)
1749 struct nfs4_client *clp;
1750 int i;
1752 clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
1753 if (clp == NULL)
1754 return NULL;
1755 clp->cl_name.data = kmemdup(name.data, name.len, GFP_KERNEL);
1756 if (clp->cl_name.data == NULL)
1757 goto err_no_name;
1758 clp->cl_ownerstr_hashtbl = kmalloc(sizeof(struct list_head) *
1759 OWNER_HASH_SIZE, GFP_KERNEL);
1760 if (!clp->cl_ownerstr_hashtbl)
1761 goto err_no_hashtbl;
1762 for (i = 0; i < OWNER_HASH_SIZE; i++)
1763 INIT_LIST_HEAD(&clp->cl_ownerstr_hashtbl[i]);
1764 clp->cl_name.len = name.len;
1765 INIT_LIST_HEAD(&clp->cl_sessions);
1766 idr_init(&clp->cl_stateids);
1767 atomic_set(&clp->cl_refcount, 0);
1768 clp->cl_cb_state = NFSD4_CB_UNKNOWN;
1769 INIT_LIST_HEAD(&clp->cl_idhash);
1770 INIT_LIST_HEAD(&clp->cl_openowners);
1771 INIT_LIST_HEAD(&clp->cl_delegations);
1772 INIT_LIST_HEAD(&clp->cl_lru);
1773 INIT_LIST_HEAD(&clp->cl_revoked);
1774 #ifdef CONFIG_NFSD_PNFS
1775 INIT_LIST_HEAD(&clp->cl_lo_states);
1776 #endif
1777 spin_lock_init(&clp->cl_lock);
1778 rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
1779 return clp;
1780 err_no_hashtbl:
1781 kfree(clp->cl_name.data);
1782 err_no_name:
1783 kfree(clp);
1784 return NULL;
1787 static void
1788 free_client(struct nfs4_client *clp)
1790 while (!list_empty(&clp->cl_sessions)) {
1791 struct nfsd4_session *ses;
1792 ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
1793 se_perclnt);
1794 list_del(&ses->se_perclnt);
1795 WARN_ON_ONCE(atomic_read(&ses->se_ref));
1796 free_session(ses);
1798 rpc_destroy_wait_queue(&clp->cl_cb_waitq);
1799 free_svc_cred(&clp->cl_cred);
1800 kfree(clp->cl_ownerstr_hashtbl);
1801 kfree(clp->cl_name.data);
1802 idr_destroy(&clp->cl_stateids);
1803 kfree(clp);
1806 /* must be called under the client_lock */
1807 static void
1808 unhash_client_locked(struct nfs4_client *clp)
1810 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1811 struct nfsd4_session *ses;
1813 lockdep_assert_held(&nn->client_lock);
1815 /* Mark the client as expired! */
1816 clp->cl_time = 0;
1817 /* Make it invisible */
1818 if (!list_empty(&clp->cl_idhash)) {
1819 list_del_init(&clp->cl_idhash);
1820 if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
1821 rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
1822 else
1823 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
1825 list_del_init(&clp->cl_lru);
1826 spin_lock(&clp->cl_lock);
1827 list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
1828 list_del_init(&ses->se_hash);
1829 spin_unlock(&clp->cl_lock);
1832 static void
1833 unhash_client(struct nfs4_client *clp)
1835 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
1837 spin_lock(&nn->client_lock);
1838 unhash_client_locked(clp);
1839 spin_unlock(&nn->client_lock);
1842 static __be32 mark_client_expired_locked(struct nfs4_client *clp)
1844 if (atomic_read(&clp->cl_refcount))
1845 return nfserr_jukebox;
1846 unhash_client_locked(clp);
1847 return nfs_ok;
1850 static void
1851 __destroy_client(struct nfs4_client *clp)
1853 struct nfs4_openowner *oo;
1854 struct nfs4_delegation *dp;
1855 struct list_head reaplist;
1857 INIT_LIST_HEAD(&reaplist);
1858 spin_lock(&state_lock);
1859 while (!list_empty(&clp->cl_delegations)) {
1860 dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
1861 WARN_ON(!unhash_delegation_locked(dp));
1862 list_add(&dp->dl_recall_lru, &reaplist);
1864 spin_unlock(&state_lock);
1865 while (!list_empty(&reaplist)) {
1866 dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
1867 list_del_init(&dp->dl_recall_lru);
1868 put_clnt_odstate(dp->dl_clnt_odstate);
1869 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
1870 nfs4_put_stid(&dp->dl_stid);
1872 while (!list_empty(&clp->cl_revoked)) {
1873 dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
1874 list_del_init(&dp->dl_recall_lru);
1875 nfs4_put_stid(&dp->dl_stid);
1877 while (!list_empty(&clp->cl_openowners)) {
1878 oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
1879 nfs4_get_stateowner(&oo->oo_owner);
1880 release_openowner(oo);
1882 nfsd4_return_all_client_layouts(clp);
1883 nfsd4_shutdown_callback(clp);
1884 if (clp->cl_cb_conn.cb_xprt)
1885 svc_xprt_put(clp->cl_cb_conn.cb_xprt);
1886 free_client(clp);
1889 static void
1890 destroy_client(struct nfs4_client *clp)
1892 unhash_client(clp);
1893 __destroy_client(clp);
1896 static void expire_client(struct nfs4_client *clp)
1898 unhash_client(clp);
1899 nfsd4_client_record_remove(clp);
1900 __destroy_client(clp);
1903 static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
1905 memcpy(target->cl_verifier.data, source->data,
1906 sizeof(target->cl_verifier.data));
1909 static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
1911 target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
1912 target->cl_clientid.cl_id = source->cl_clientid.cl_id;
1915 int strdup_if_nonnull(char **target, char *source)
1917 if (source) {
1918 *target = kstrdup(source, GFP_KERNEL);
1919 if (!*target)
1920 return -ENOMEM;
1921 } else
1922 *target = NULL;
1923 return 0;
1926 static int copy_cred(struct svc_cred *target, struct svc_cred *source)
1928 int ret;
1930 ret = strdup_if_nonnull(&target->cr_principal, source->cr_principal);
1931 if (ret)
1932 return ret;
1933 ret = strdup_if_nonnull(&target->cr_raw_principal,
1934 source->cr_raw_principal);
1935 if (ret)
1936 return ret;
1937 target->cr_flavor = source->cr_flavor;
1938 target->cr_uid = source->cr_uid;
1939 target->cr_gid = source->cr_gid;
1940 target->cr_group_info = source->cr_group_info;
1941 get_group_info(target->cr_group_info);
1942 target->cr_gss_mech = source->cr_gss_mech;
1943 if (source->cr_gss_mech)
1944 gss_mech_get(source->cr_gss_mech);
1945 return 0;
1948 static int
1949 compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
1951 if (o1->len < o2->len)
1952 return -1;
1953 if (o1->len > o2->len)
1954 return 1;
1955 return memcmp(o1->data, o2->data, o1->len);
1958 static int same_name(const char *n1, const char *n2)
1960 return 0 == memcmp(n1, n2, HEXDIR_LEN);
1963 static int
1964 same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
1966 return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
1969 static int
1970 same_clid(clientid_t *cl1, clientid_t *cl2)
1972 return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
1975 static bool groups_equal(struct group_info *g1, struct group_info *g2)
1977 int i;
1979 if (g1->ngroups != g2->ngroups)
1980 return false;
1981 for (i=0; i<g1->ngroups; i++)
1982 if (!gid_eq(g1->gid[i], g2->gid[i]))
1983 return false;
1984 return true;
1988 * RFC 3530 language requires clid_inuse be returned when the
1989 * "principal" associated with a requests differs from that previously
1990 * used. We use uid, gid's, and gss principal string as our best
1991 * approximation. We also don't want to allow non-gss use of a client
1992 * established using gss: in theory cr_principal should catch that
1993 * change, but in practice cr_principal can be null even in the gss case
1994 * since gssd doesn't always pass down a principal string.
1996 static bool is_gss_cred(struct svc_cred *cr)
1998 /* Is cr_flavor one of the gss "pseudoflavors"?: */
1999 return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2003 static bool
2004 same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2006 if ((is_gss_cred(cr1) != is_gss_cred(cr2))
2007 || (!uid_eq(cr1->cr_uid, cr2->cr_uid))
2008 || (!gid_eq(cr1->cr_gid, cr2->cr_gid))
2009 || !groups_equal(cr1->cr_group_info, cr2->cr_group_info))
2010 return false;
2011 if (cr1->cr_principal == cr2->cr_principal)
2012 return true;
2013 if (!cr1->cr_principal || !cr2->cr_principal)
2014 return false;
2015 return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2018 static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2020 struct svc_cred *cr = &rqstp->rq_cred;
2021 u32 service;
2023 if (!cr->cr_gss_mech)
2024 return false;
2025 service = gss_pseudoflavor_to_service(cr->cr_gss_mech, cr->cr_flavor);
2026 return service == RPC_GSS_SVC_INTEGRITY ||
2027 service == RPC_GSS_SVC_PRIVACY;
2030 bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2032 struct svc_cred *cr = &rqstp->rq_cred;
2034 if (!cl->cl_mach_cred)
2035 return true;
2036 if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2037 return false;
2038 if (!svc_rqst_integrity_protected(rqstp))
2039 return false;
2040 if (cl->cl_cred.cr_raw_principal)
2041 return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2042 cr->cr_raw_principal);
2043 if (!cr->cr_principal)
2044 return false;
2045 return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2048 static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2050 __be32 verf[2];
2053 * This is opaque to client, so no need to byte-swap. Use
2054 * __force to keep sparse happy
2056 verf[0] = (__force __be32)get_seconds();
2057 verf[1] = (__force __be32)nn->clverifier_counter++;
2058 memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2061 static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2063 clp->cl_clientid.cl_boot = nn->boot_time;
2064 clp->cl_clientid.cl_id = nn->clientid_counter++;
2065 gen_confirm(clp, nn);
2068 static struct nfs4_stid *
2069 find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2071 struct nfs4_stid *ret;
2073 ret = idr_find(&cl->cl_stateids, t->si_opaque.so_id);
2074 if (!ret || !ret->sc_type)
2075 return NULL;
2076 return ret;
2079 static struct nfs4_stid *
2080 find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2082 struct nfs4_stid *s;
2084 spin_lock(&cl->cl_lock);
2085 s = find_stateid_locked(cl, t);
2086 if (s != NULL) {
2087 if (typemask & s->sc_type)
2088 atomic_inc(&s->sc_count);
2089 else
2090 s = NULL;
2092 spin_unlock(&cl->cl_lock);
2093 return s;
2096 static struct nfs4_client *create_client(struct xdr_netobj name,
2097 struct svc_rqst *rqstp, nfs4_verifier *verf)
2099 struct nfs4_client *clp;
2100 struct sockaddr *sa = svc_addr(rqstp);
2101 int ret;
2102 struct net *net = SVC_NET(rqstp);
2104 clp = alloc_client(name);
2105 if (clp == NULL)
2106 return NULL;
2108 ret = copy_cred(&clp->cl_cred, &rqstp->rq_cred);
2109 if (ret) {
2110 free_client(clp);
2111 return NULL;
2113 nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
2114 clp->cl_time = get_seconds();
2115 clear_bit(0, &clp->cl_cb_slot_busy);
2116 copy_verf(clp, verf);
2117 rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
2118 clp->cl_cb_session = NULL;
2119 clp->net = net;
2120 return clp;
2123 static void
2124 add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
2126 struct rb_node **new = &(root->rb_node), *parent = NULL;
2127 struct nfs4_client *clp;
2129 while (*new) {
2130 clp = rb_entry(*new, struct nfs4_client, cl_namenode);
2131 parent = *new;
2133 if (compare_blob(&clp->cl_name, &new_clp->cl_name) > 0)
2134 new = &((*new)->rb_left);
2135 else
2136 new = &((*new)->rb_right);
2139 rb_link_node(&new_clp->cl_namenode, parent, new);
2140 rb_insert_color(&new_clp->cl_namenode, root);
2143 static struct nfs4_client *
2144 find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
2146 int cmp;
2147 struct rb_node *node = root->rb_node;
2148 struct nfs4_client *clp;
2150 while (node) {
2151 clp = rb_entry(node, struct nfs4_client, cl_namenode);
2152 cmp = compare_blob(&clp->cl_name, name);
2153 if (cmp > 0)
2154 node = node->rb_left;
2155 else if (cmp < 0)
2156 node = node->rb_right;
2157 else
2158 return clp;
2160 return NULL;
2163 static void
2164 add_to_unconfirmed(struct nfs4_client *clp)
2166 unsigned int idhashval;
2167 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2169 lockdep_assert_held(&nn->client_lock);
2171 clear_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2172 add_clp_to_name_tree(clp, &nn->unconf_name_tree);
2173 idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2174 list_add(&clp->cl_idhash, &nn->unconf_id_hashtbl[idhashval]);
2175 renew_client_locked(clp);
2178 static void
2179 move_to_confirmed(struct nfs4_client *clp)
2181 unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
2182 struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
2184 lockdep_assert_held(&nn->client_lock);
2186 dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
2187 list_move(&clp->cl_idhash, &nn->conf_id_hashtbl[idhashval]);
2188 rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2189 add_clp_to_name_tree(clp, &nn->conf_name_tree);
2190 set_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags);
2191 renew_client_locked(clp);
2194 static struct nfs4_client *
2195 find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
2197 struct nfs4_client *clp;
2198 unsigned int idhashval = clientid_hashval(clid->cl_id);
2200 list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
2201 if (same_clid(&clp->cl_clientid, clid)) {
2202 if ((bool)clp->cl_minorversion != sessions)
2203 return NULL;
2204 renew_client_locked(clp);
2205 return clp;
2208 return NULL;
2211 static struct nfs4_client *
2212 find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2214 struct list_head *tbl = nn->conf_id_hashtbl;
2216 lockdep_assert_held(&nn->client_lock);
2217 return find_client_in_id_table(tbl, clid, sessions);
2220 static struct nfs4_client *
2221 find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
2223 struct list_head *tbl = nn->unconf_id_hashtbl;
2225 lockdep_assert_held(&nn->client_lock);
2226 return find_client_in_id_table(tbl, clid, sessions);
2229 static bool clp_used_exchangeid(struct nfs4_client *clp)
2231 return clp->cl_exchange_flags != 0;
2234 static struct nfs4_client *
2235 find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2237 lockdep_assert_held(&nn->client_lock);
2238 return find_clp_in_name_tree(name, &nn->conf_name_tree);
2241 static struct nfs4_client *
2242 find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
2244 lockdep_assert_held(&nn->client_lock);
2245 return find_clp_in_name_tree(name, &nn->unconf_name_tree);
2248 static void
2249 gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
2251 struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
2252 struct sockaddr *sa = svc_addr(rqstp);
2253 u32 scopeid = rpc_get_scope_id(sa);
2254 unsigned short expected_family;
2256 /* Currently, we only support tcp and tcp6 for the callback channel */
2257 if (se->se_callback_netid_len == 3 &&
2258 !memcmp(se->se_callback_netid_val, "tcp", 3))
2259 expected_family = AF_INET;
2260 else if (se->se_callback_netid_len == 4 &&
2261 !memcmp(se->se_callback_netid_val, "tcp6", 4))
2262 expected_family = AF_INET6;
2263 else
2264 goto out_err;
2266 conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
2267 se->se_callback_addr_len,
2268 (struct sockaddr *)&conn->cb_addr,
2269 sizeof(conn->cb_addr));
2271 if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
2272 goto out_err;
2274 if (conn->cb_addr.ss_family == AF_INET6)
2275 ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
2277 conn->cb_prog = se->se_callback_prog;
2278 conn->cb_ident = se->se_callback_ident;
2279 memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
2280 return;
2281 out_err:
2282 conn->cb_addr.ss_family = AF_UNSPEC;
2283 conn->cb_addrlen = 0;
2284 dprintk("NFSD: this client (clientid %08x/%08x) "
2285 "will not receive delegations\n",
2286 clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
2288 return;
2292 * Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
2294 static void
2295 nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
2297 struct xdr_buf *buf = resp->xdr.buf;
2298 struct nfsd4_slot *slot = resp->cstate.slot;
2299 unsigned int base;
2301 dprintk("--> %s slot %p\n", __func__, slot);
2303 slot->sl_opcnt = resp->opcnt;
2304 slot->sl_status = resp->cstate.status;
2306 slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
2307 if (nfsd4_not_cached(resp)) {
2308 slot->sl_datalen = 0;
2309 return;
2311 base = resp->cstate.data_offset;
2312 slot->sl_datalen = buf->len - base;
2313 if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
2314 WARN(1, "%s: sessions DRC could not cache compound\n",
2315 __func__);
2316 return;
2320 * Encode the replay sequence operation from the slot values.
2321 * If cachethis is FALSE encode the uncached rep error on the next
2322 * operation which sets resp->p and increments resp->opcnt for
2323 * nfs4svc_encode_compoundres.
2326 static __be32
2327 nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
2328 struct nfsd4_compoundres *resp)
2330 struct nfsd4_op *op;
2331 struct nfsd4_slot *slot = resp->cstate.slot;
2333 /* Encode the replayed sequence operation */
2334 op = &args->ops[resp->opcnt - 1];
2335 nfsd4_encode_operation(resp, op);
2337 /* Return nfserr_retry_uncached_rep in next operation. */
2338 if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
2339 op = &args->ops[resp->opcnt++];
2340 op->status = nfserr_retry_uncached_rep;
2341 nfsd4_encode_operation(resp, op);
2343 return op->status;
2347 * The sequence operation is not cached because we can use the slot and
2348 * session values.
2350 static __be32
2351 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
2352 struct nfsd4_sequence *seq)
2354 struct nfsd4_slot *slot = resp->cstate.slot;
2355 struct xdr_stream *xdr = &resp->xdr;
2356 __be32 *p;
2357 __be32 status;
2359 dprintk("--> %s slot %p\n", __func__, slot);
2361 status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
2362 if (status)
2363 return status;
2365 p = xdr_reserve_space(xdr, slot->sl_datalen);
2366 if (!p) {
2367 WARN_ON_ONCE(1);
2368 return nfserr_serverfault;
2370 xdr_encode_opaque_fixed(p, slot->sl_data, slot->sl_datalen);
2371 xdr_commit_encode(xdr);
2373 resp->opcnt = slot->sl_opcnt;
2374 return slot->sl_status;
2378 * Set the exchange_id flags returned by the server.
2380 static void
2381 nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
2383 #ifdef CONFIG_NFSD_PNFS
2384 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
2385 #else
2386 new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
2387 #endif
2389 /* Referrals are supported, Migration is not. */
2390 new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
2392 /* set the wire flags to return to client. */
2393 clid->flags = new->cl_exchange_flags;
2396 static bool client_has_openowners(struct nfs4_client *clp)
2398 struct nfs4_openowner *oo;
2400 list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
2401 if (!list_empty(&oo->oo_owner.so_stateids))
2402 return true;
2404 return false;
2407 static bool client_has_state(struct nfs4_client *clp)
2409 return client_has_openowners(clp)
2410 #ifdef CONFIG_NFSD_PNFS
2411 || !list_empty(&clp->cl_lo_states)
2412 #endif
2413 || !list_empty(&clp->cl_delegations)
2414 || !list_empty(&clp->cl_sessions);
2417 __be32
2418 nfsd4_exchange_id(struct svc_rqst *rqstp,
2419 struct nfsd4_compound_state *cstate,
2420 struct nfsd4_exchange_id *exid)
2422 struct nfs4_client *conf, *new;
2423 struct nfs4_client *unconf = NULL;
2424 __be32 status;
2425 char addr_str[INET6_ADDRSTRLEN];
2426 nfs4_verifier verf = exid->verifier;
2427 struct sockaddr *sa = svc_addr(rqstp);
2428 bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
2429 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2431 rpc_ntop(sa, addr_str, sizeof(addr_str));
2432 dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
2433 "ip_addr=%s flags %x, spa_how %d\n",
2434 __func__, rqstp, exid, exid->clname.len, exid->clname.data,
2435 addr_str, exid->flags, exid->spa_how);
2437 if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
2438 return nfserr_inval;
2440 new = create_client(exid->clname, rqstp, &verf);
2441 if (new == NULL)
2442 return nfserr_jukebox;
2444 switch (exid->spa_how) {
2445 case SP4_MACH_CRED:
2446 exid->spo_must_enforce[0] = 0;
2447 exid->spo_must_enforce[1] = (
2448 1 << (OP_BIND_CONN_TO_SESSION - 32) |
2449 1 << (OP_EXCHANGE_ID - 32) |
2450 1 << (OP_CREATE_SESSION - 32) |
2451 1 << (OP_DESTROY_SESSION - 32) |
2452 1 << (OP_DESTROY_CLIENTID - 32));
2454 exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
2455 1 << (OP_OPEN_DOWNGRADE) |
2456 1 << (OP_LOCKU) |
2457 1 << (OP_DELEGRETURN));
2459 exid->spo_must_allow[1] &= (
2460 1 << (OP_TEST_STATEID - 32) |
2461 1 << (OP_FREE_STATEID - 32));
2462 if (!svc_rqst_integrity_protected(rqstp)) {
2463 status = nfserr_inval;
2464 goto out_nolock;
2467 * Sometimes userspace doesn't give us a principal.
2468 * Which is a bug, really. Anyway, we can't enforce
2469 * MACH_CRED in that case, better to give up now:
2471 if (!new->cl_cred.cr_principal &&
2472 !new->cl_cred.cr_raw_principal) {
2473 status = nfserr_serverfault;
2474 goto out_nolock;
2476 new->cl_mach_cred = true;
2477 case SP4_NONE:
2478 break;
2479 default: /* checked by xdr code */
2480 WARN_ON_ONCE(1);
2481 case SP4_SSV:
2482 status = nfserr_encr_alg_unsupp;
2483 goto out_nolock;
2486 /* Cases below refer to rfc 5661 section 18.35.4: */
2487 spin_lock(&nn->client_lock);
2488 conf = find_confirmed_client_by_name(&exid->clname, nn);
2489 if (conf) {
2490 bool creds_match = same_creds(&conf->cl_cred, &rqstp->rq_cred);
2491 bool verfs_match = same_verf(&verf, &conf->cl_verifier);
2493 if (update) {
2494 if (!clp_used_exchangeid(conf)) { /* buggy client */
2495 status = nfserr_inval;
2496 goto out;
2498 if (!nfsd4_mach_creds_match(conf, rqstp)) {
2499 status = nfserr_wrong_cred;
2500 goto out;
2502 if (!creds_match) { /* case 9 */
2503 status = nfserr_perm;
2504 goto out;
2506 if (!verfs_match) { /* case 8 */
2507 status = nfserr_not_same;
2508 goto out;
2510 /* case 6 */
2511 exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
2512 goto out_copy;
2514 if (!creds_match) { /* case 3 */
2515 if (client_has_state(conf)) {
2516 status = nfserr_clid_inuse;
2517 goto out;
2519 goto out_new;
2521 if (verfs_match) { /* case 2 */
2522 conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
2523 goto out_copy;
2525 /* case 5, client reboot */
2526 conf = NULL;
2527 goto out_new;
2530 if (update) { /* case 7 */
2531 status = nfserr_noent;
2532 goto out;
2535 unconf = find_unconfirmed_client_by_name(&exid->clname, nn);
2536 if (unconf) /* case 4, possible retry or client restart */
2537 unhash_client_locked(unconf);
2539 /* case 1 (normal case) */
2540 out_new:
2541 if (conf) {
2542 status = mark_client_expired_locked(conf);
2543 if (status)
2544 goto out;
2546 new->cl_minorversion = cstate->minorversion;
2547 new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
2548 new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
2550 gen_clid(new, nn);
2551 add_to_unconfirmed(new);
2552 swap(new, conf);
2553 out_copy:
2554 exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
2555 exid->clientid.cl_id = conf->cl_clientid.cl_id;
2557 exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
2558 nfsd4_set_ex_flags(conf, exid);
2560 dprintk("nfsd4_exchange_id seqid %d flags %x\n",
2561 conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
2562 status = nfs_ok;
2564 out:
2565 spin_unlock(&nn->client_lock);
2566 out_nolock:
2567 if (new)
2568 expire_client(new);
2569 if (unconf)
2570 expire_client(unconf);
2571 return status;
2574 static __be32
2575 check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
2577 dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
2578 slot_seqid);
2580 /* The slot is in use, and no response has been sent. */
2581 if (slot_inuse) {
2582 if (seqid == slot_seqid)
2583 return nfserr_jukebox;
2584 else
2585 return nfserr_seq_misordered;
2587 /* Note unsigned 32-bit arithmetic handles wraparound: */
2588 if (likely(seqid == slot_seqid + 1))
2589 return nfs_ok;
2590 if (seqid == slot_seqid)
2591 return nfserr_replay_cache;
2592 return nfserr_seq_misordered;
2596 * Cache the create session result into the create session single DRC
2597 * slot cache by saving the xdr structure. sl_seqid has been set.
2598 * Do this for solo or embedded create session operations.
2600 static void
2601 nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
2602 struct nfsd4_clid_slot *slot, __be32 nfserr)
2604 slot->sl_status = nfserr;
2605 memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
2608 static __be32
2609 nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
2610 struct nfsd4_clid_slot *slot)
2612 memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
2613 return slot->sl_status;
2616 #define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
2617 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
2618 1 + /* MIN tag is length with zero, only length */ \
2619 3 + /* version, opcount, opcode */ \
2620 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2621 /* seqid, slotID, slotID, cache */ \
2622 4 ) * sizeof(__be32))
2624 #define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
2625 2 + /* verifier: AUTH_NULL, length 0 */\
2626 1 + /* status */ \
2627 1 + /* MIN tag is length with zero, only length */ \
2628 3 + /* opcount, opcode, opstatus*/ \
2629 XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
2630 /* seqid, slotID, slotID, slotID, status */ \
2631 5 ) * sizeof(__be32))
2633 static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
2635 u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
2637 if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
2638 return nfserr_toosmall;
2639 if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
2640 return nfserr_toosmall;
2641 ca->headerpadsz = 0;
2642 ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
2643 ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
2644 ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
2645 ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
2646 NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
2647 ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
2649 * Note decreasing slot size below client's request may make it
2650 * difficult for client to function correctly, whereas
2651 * decreasing the number of slots will (just?) affect
2652 * performance. When short on memory we therefore prefer to
2653 * decrease number of slots instead of their size. Clients that
2654 * request larger slots than they need will get poor results:
2656 ca->maxreqs = nfsd4_get_drc_mem(ca);
2657 if (!ca->maxreqs)
2658 return nfserr_jukebox;
2660 return nfs_ok;
2664 * Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
2665 * These are based on similar macros in linux/sunrpc/msg_prot.h .
2667 #define RPC_MAX_HEADER_WITH_AUTH_SYS \
2668 (RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
2670 #define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
2671 (RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
2673 #define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
2674 RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
2675 #define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
2676 RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
2677 sizeof(__be32))
2679 static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
2681 ca->headerpadsz = 0;
2683 if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
2684 return nfserr_toosmall;
2685 if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
2686 return nfserr_toosmall;
2687 ca->maxresp_cached = 0;
2688 if (ca->maxops < 2)
2689 return nfserr_toosmall;
2691 return nfs_ok;
2694 static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
2696 switch (cbs->flavor) {
2697 case RPC_AUTH_NULL:
2698 case RPC_AUTH_UNIX:
2699 return nfs_ok;
2700 default:
2702 * GSS case: the spec doesn't allow us to return this
2703 * error. But it also doesn't allow us not to support
2704 * GSS.
2705 * I'd rather this fail hard than return some error the
2706 * client might think it can already handle:
2708 return nfserr_encr_alg_unsupp;
2712 __be32
2713 nfsd4_create_session(struct svc_rqst *rqstp,
2714 struct nfsd4_compound_state *cstate,
2715 struct nfsd4_create_session *cr_ses)
2717 struct sockaddr *sa = svc_addr(rqstp);
2718 struct nfs4_client *conf, *unconf;
2719 struct nfs4_client *old = NULL;
2720 struct nfsd4_session *new;
2721 struct nfsd4_conn *conn;
2722 struct nfsd4_clid_slot *cs_slot = NULL;
2723 __be32 status = 0;
2724 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2726 if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
2727 return nfserr_inval;
2728 status = nfsd4_check_cb_sec(&cr_ses->cb_sec);
2729 if (status)
2730 return status;
2731 status = check_forechannel_attrs(&cr_ses->fore_channel, nn);
2732 if (status)
2733 return status;
2734 status = check_backchannel_attrs(&cr_ses->back_channel);
2735 if (status)
2736 goto out_release_drc_mem;
2737 status = nfserr_jukebox;
2738 new = alloc_session(&cr_ses->fore_channel, &cr_ses->back_channel);
2739 if (!new)
2740 goto out_release_drc_mem;
2741 conn = alloc_conn_from_crses(rqstp, cr_ses);
2742 if (!conn)
2743 goto out_free_session;
2745 spin_lock(&nn->client_lock);
2746 unconf = find_unconfirmed_client(&cr_ses->clientid, true, nn);
2747 conf = find_confirmed_client(&cr_ses->clientid, true, nn);
2748 WARN_ON_ONCE(conf && unconf);
2750 if (conf) {
2751 status = nfserr_wrong_cred;
2752 if (!nfsd4_mach_creds_match(conf, rqstp))
2753 goto out_free_conn;
2754 cs_slot = &conf->cl_cs_slot;
2755 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2756 if (status) {
2757 if (status == nfserr_replay_cache)
2758 status = nfsd4_replay_create_session(cr_ses, cs_slot);
2759 goto out_free_conn;
2761 } else if (unconf) {
2762 if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
2763 !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
2764 status = nfserr_clid_inuse;
2765 goto out_free_conn;
2767 status = nfserr_wrong_cred;
2768 if (!nfsd4_mach_creds_match(unconf, rqstp))
2769 goto out_free_conn;
2770 cs_slot = &unconf->cl_cs_slot;
2771 status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
2772 if (status) {
2773 /* an unconfirmed replay returns misordered */
2774 status = nfserr_seq_misordered;
2775 goto out_free_conn;
2777 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
2778 if (old) {
2779 status = mark_client_expired_locked(old);
2780 if (status) {
2781 old = NULL;
2782 goto out_free_conn;
2785 move_to_confirmed(unconf);
2786 conf = unconf;
2787 } else {
2788 status = nfserr_stale_clientid;
2789 goto out_free_conn;
2791 status = nfs_ok;
2792 /* Persistent sessions are not supported */
2793 cr_ses->flags &= ~SESSION4_PERSIST;
2794 /* Upshifting from TCP to RDMA is not supported */
2795 cr_ses->flags &= ~SESSION4_RDMA;
2797 init_session(rqstp, new, conf, cr_ses);
2798 nfsd4_get_session_locked(new);
2800 memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
2801 NFS4_MAX_SESSIONID_LEN);
2802 cs_slot->sl_seqid++;
2803 cr_ses->seqid = cs_slot->sl_seqid;
2805 /* cache solo and embedded create sessions under the client_lock */
2806 nfsd4_cache_create_session(cr_ses, cs_slot, status);
2807 spin_unlock(&nn->client_lock);
2808 /* init connection and backchannel */
2809 nfsd4_init_conn(rqstp, conn, new);
2810 nfsd4_put_session(new);
2811 if (old)
2812 expire_client(old);
2813 return status;
2814 out_free_conn:
2815 spin_unlock(&nn->client_lock);
2816 free_conn(conn);
2817 if (old)
2818 expire_client(old);
2819 out_free_session:
2820 __free_session(new);
2821 out_release_drc_mem:
2822 nfsd4_put_drc_mem(&cr_ses->fore_channel);
2823 return status;
2826 static __be32 nfsd4_map_bcts_dir(u32 *dir)
2828 switch (*dir) {
2829 case NFS4_CDFC4_FORE:
2830 case NFS4_CDFC4_BACK:
2831 return nfs_ok;
2832 case NFS4_CDFC4_FORE_OR_BOTH:
2833 case NFS4_CDFC4_BACK_OR_BOTH:
2834 *dir = NFS4_CDFC4_BOTH;
2835 return nfs_ok;
2837 return nfserr_inval;
2840 __be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_backchannel_ctl *bc)
2842 struct nfsd4_session *session = cstate->session;
2843 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
2844 __be32 status;
2846 status = nfsd4_check_cb_sec(&bc->bc_cb_sec);
2847 if (status)
2848 return status;
2849 spin_lock(&nn->client_lock);
2850 session->se_cb_prog = bc->bc_cb_program;
2851 session->se_cb_sec = bc->bc_cb_sec;
2852 spin_unlock(&nn->client_lock);
2854 nfsd4_probe_callback(session->se_client);
2856 return nfs_ok;
2859 __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
2860 struct nfsd4_compound_state *cstate,
2861 struct nfsd4_bind_conn_to_session *bcts)
2863 __be32 status;
2864 struct nfsd4_conn *conn;
2865 struct nfsd4_session *session;
2866 struct net *net = SVC_NET(rqstp);
2867 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2869 if (!nfsd4_last_compound_op(rqstp))
2870 return nfserr_not_only_op;
2871 spin_lock(&nn->client_lock);
2872 session = find_in_sessionid_hashtbl(&bcts->sessionid, net, &status);
2873 spin_unlock(&nn->client_lock);
2874 if (!session)
2875 goto out_no_session;
2876 status = nfserr_wrong_cred;
2877 if (!nfsd4_mach_creds_match(session->se_client, rqstp))
2878 goto out;
2879 status = nfsd4_map_bcts_dir(&bcts->dir);
2880 if (status)
2881 goto out;
2882 conn = alloc_conn(rqstp, bcts->dir);
2883 status = nfserr_jukebox;
2884 if (!conn)
2885 goto out;
2886 nfsd4_init_conn(rqstp, conn, session);
2887 status = nfs_ok;
2888 out:
2889 nfsd4_put_session(session);
2890 out_no_session:
2891 return status;
2894 static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
2896 if (!session)
2897 return 0;
2898 return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
2901 __be32
2902 nfsd4_destroy_session(struct svc_rqst *r,
2903 struct nfsd4_compound_state *cstate,
2904 struct nfsd4_destroy_session *sessionid)
2906 struct nfsd4_session *ses;
2907 __be32 status;
2908 int ref_held_by_me = 0;
2909 struct net *net = SVC_NET(r);
2910 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
2912 status = nfserr_not_only_op;
2913 if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
2914 if (!nfsd4_last_compound_op(r))
2915 goto out;
2916 ref_held_by_me++;
2918 dump_sessionid(__func__, &sessionid->sessionid);
2919 spin_lock(&nn->client_lock);
2920 ses = find_in_sessionid_hashtbl(&sessionid->sessionid, net, &status);
2921 if (!ses)
2922 goto out_client_lock;
2923 status = nfserr_wrong_cred;
2924 if (!nfsd4_mach_creds_match(ses->se_client, r))
2925 goto out_put_session;
2926 status = mark_session_dead_locked(ses, 1 + ref_held_by_me);
2927 if (status)
2928 goto out_put_session;
2929 unhash_session(ses);
2930 spin_unlock(&nn->client_lock);
2932 nfsd4_probe_callback_sync(ses->se_client);
2934 spin_lock(&nn->client_lock);
2935 status = nfs_ok;
2936 out_put_session:
2937 nfsd4_put_session_locked(ses);
2938 out_client_lock:
2939 spin_unlock(&nn->client_lock);
2940 out:
2941 return status;
2944 static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
2946 struct nfsd4_conn *c;
2948 list_for_each_entry(c, &s->se_conns, cn_persession) {
2949 if (c->cn_xprt == xpt) {
2950 return c;
2953 return NULL;
2956 static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
2958 struct nfs4_client *clp = ses->se_client;
2959 struct nfsd4_conn *c;
2960 __be32 status = nfs_ok;
2961 int ret;
2963 spin_lock(&clp->cl_lock);
2964 c = __nfsd4_find_conn(new->cn_xprt, ses);
2965 if (c)
2966 goto out_free;
2967 status = nfserr_conn_not_bound_to_session;
2968 if (clp->cl_mach_cred)
2969 goto out_free;
2970 __nfsd4_hash_conn(new, ses);
2971 spin_unlock(&clp->cl_lock);
2972 ret = nfsd4_register_conn(new);
2973 if (ret)
2974 /* oops; xprt is already down: */
2975 nfsd4_conn_lost(&new->cn_xpt_user);
2976 return nfs_ok;
2977 out_free:
2978 spin_unlock(&clp->cl_lock);
2979 free_conn(new);
2980 return status;
2983 static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
2985 struct nfsd4_compoundargs *args = rqstp->rq_argp;
2987 return args->opcnt > session->se_fchannel.maxops;
2990 static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
2991 struct nfsd4_session *session)
2993 struct xdr_buf *xb = &rqstp->rq_arg;
2995 return xb->len > session->se_fchannel.maxreq_sz;
2998 __be32
2999 nfsd4_sequence(struct svc_rqst *rqstp,
3000 struct nfsd4_compound_state *cstate,
3001 struct nfsd4_sequence *seq)
3003 struct nfsd4_compoundres *resp = rqstp->rq_resp;
3004 struct xdr_stream *xdr = &resp->xdr;
3005 struct nfsd4_session *session;
3006 struct nfs4_client *clp;
3007 struct nfsd4_slot *slot;
3008 struct nfsd4_conn *conn;
3009 __be32 status;
3010 int buflen;
3011 struct net *net = SVC_NET(rqstp);
3012 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
3014 if (resp->opcnt != 1)
3015 return nfserr_sequence_pos;
3018 * Will be either used or freed by nfsd4_sequence_check_conn
3019 * below.
3021 conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
3022 if (!conn)
3023 return nfserr_jukebox;
3025 spin_lock(&nn->client_lock);
3026 session = find_in_sessionid_hashtbl(&seq->sessionid, net, &status);
3027 if (!session)
3028 goto out_no_session;
3029 clp = session->se_client;
3031 status = nfserr_too_many_ops;
3032 if (nfsd4_session_too_many_ops(rqstp, session))
3033 goto out_put_session;
3035 status = nfserr_req_too_big;
3036 if (nfsd4_request_too_big(rqstp, session))
3037 goto out_put_session;
3039 status = nfserr_badslot;
3040 if (seq->slotid >= session->se_fchannel.maxreqs)
3041 goto out_put_session;
3043 slot = session->se_slots[seq->slotid];
3044 dprintk("%s: slotid %d\n", __func__, seq->slotid);
3046 /* We do not negotiate the number of slots yet, so set the
3047 * maxslots to the session maxreqs which is used to encode
3048 * sr_highest_slotid and the sr_target_slot id to maxslots */
3049 seq->maxslots = session->se_fchannel.maxreqs;
3051 status = check_slot_seqid(seq->seqid, slot->sl_seqid,
3052 slot->sl_flags & NFSD4_SLOT_INUSE);
3053 if (status == nfserr_replay_cache) {
3054 status = nfserr_seq_misordered;
3055 if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
3056 goto out_put_session;
3057 cstate->slot = slot;
3058 cstate->session = session;
3059 cstate->clp = clp;
3060 /* Return the cached reply status and set cstate->status
3061 * for nfsd4_proc_compound processing */
3062 status = nfsd4_replay_cache_entry(resp, seq);
3063 cstate->status = nfserr_replay_cache;
3064 goto out;
3066 if (status)
3067 goto out_put_session;
3069 status = nfsd4_sequence_check_conn(conn, session);
3070 conn = NULL;
3071 if (status)
3072 goto out_put_session;
3074 buflen = (seq->cachethis) ?
3075 session->se_fchannel.maxresp_cached :
3076 session->se_fchannel.maxresp_sz;
3077 status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
3078 nfserr_rep_too_big;
3079 if (xdr_restrict_buflen(xdr, buflen - rqstp->rq_auth_slack))
3080 goto out_put_session;
3081 svc_reserve(rqstp, buflen);
3083 status = nfs_ok;
3084 /* Success! bump slot seqid */
3085 slot->sl_seqid = seq->seqid;
3086 slot->sl_flags |= NFSD4_SLOT_INUSE;
3087 if (seq->cachethis)
3088 slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
3089 else
3090 slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
3092 cstate->slot = slot;
3093 cstate->session = session;
3094 cstate->clp = clp;
3096 out:
3097 switch (clp->cl_cb_state) {
3098 case NFSD4_CB_DOWN:
3099 seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
3100 break;
3101 case NFSD4_CB_FAULT:
3102 seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
3103 break;
3104 default:
3105 seq->status_flags = 0;
3107 if (!list_empty(&clp->cl_revoked))
3108 seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
3109 out_no_session:
3110 if (conn)
3111 free_conn(conn);
3112 spin_unlock(&nn->client_lock);
3113 return status;
3114 out_put_session:
3115 nfsd4_put_session_locked(session);
3116 goto out_no_session;
3119 void
3120 nfsd4_sequence_done(struct nfsd4_compoundres *resp)
3122 struct nfsd4_compound_state *cs = &resp->cstate;
3124 if (nfsd4_has_session(cs)) {
3125 if (cs->status != nfserr_replay_cache) {
3126 nfsd4_store_cache_entry(resp);
3127 cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
3129 /* Drop session reference that was taken in nfsd4_sequence() */
3130 nfsd4_put_session(cs->session);
3131 } else if (cs->clp)
3132 put_client_renew(cs->clp);
3135 __be32
3136 nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
3138 struct nfs4_client *conf, *unconf;
3139 struct nfs4_client *clp = NULL;
3140 __be32 status = 0;
3141 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3143 spin_lock(&nn->client_lock);
3144 unconf = find_unconfirmed_client(&dc->clientid, true, nn);
3145 conf = find_confirmed_client(&dc->clientid, true, nn);
3146 WARN_ON_ONCE(conf && unconf);
3148 if (conf) {
3149 if (client_has_state(conf)) {
3150 status = nfserr_clientid_busy;
3151 goto out;
3153 status = mark_client_expired_locked(conf);
3154 if (status)
3155 goto out;
3156 clp = conf;
3157 } else if (unconf)
3158 clp = unconf;
3159 else {
3160 status = nfserr_stale_clientid;
3161 goto out;
3163 if (!nfsd4_mach_creds_match(clp, rqstp)) {
3164 clp = NULL;
3165 status = nfserr_wrong_cred;
3166 goto out;
3168 unhash_client_locked(clp);
3169 out:
3170 spin_unlock(&nn->client_lock);
3171 if (clp)
3172 expire_client(clp);
3173 return status;
3176 __be32
3177 nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
3179 __be32 status = 0;
3181 if (rc->rca_one_fs) {
3182 if (!cstate->current_fh.fh_dentry)
3183 return nfserr_nofilehandle;
3185 * We don't take advantage of the rca_one_fs case.
3186 * That's OK, it's optional, we can safely ignore it.
3188 return nfs_ok;
3191 status = nfserr_complete_already;
3192 if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
3193 &cstate->session->se_client->cl_flags))
3194 goto out;
3196 status = nfserr_stale_clientid;
3197 if (is_client_expired(cstate->session->se_client))
3199 * The following error isn't really legal.
3200 * But we only get here if the client just explicitly
3201 * destroyed the client. Surely it no longer cares what
3202 * error it gets back on an operation for the dead
3203 * client.
3205 goto out;
3207 status = nfs_ok;
3208 nfsd4_client_record_create(cstate->session->se_client);
3209 out:
3210 return status;
3213 __be32
3214 nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3215 struct nfsd4_setclientid *setclid)
3217 struct xdr_netobj clname = setclid->se_name;
3218 nfs4_verifier clverifier = setclid->se_verf;
3219 struct nfs4_client *conf, *new;
3220 struct nfs4_client *unconf = NULL;
3221 __be32 status;
3222 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3224 new = create_client(clname, rqstp, &clverifier);
3225 if (new == NULL)
3226 return nfserr_jukebox;
3227 /* Cases below refer to rfc 3530 section 14.2.33: */
3228 spin_lock(&nn->client_lock);
3229 conf = find_confirmed_client_by_name(&clname, nn);
3230 if (conf && client_has_state(conf)) {
3231 /* case 0: */
3232 status = nfserr_clid_inuse;
3233 if (clp_used_exchangeid(conf))
3234 goto out;
3235 if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
3236 char addr_str[INET6_ADDRSTRLEN];
3237 rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
3238 sizeof(addr_str));
3239 dprintk("NFSD: setclientid: string in use by client "
3240 "at %s\n", addr_str);
3241 goto out;
3244 unconf = find_unconfirmed_client_by_name(&clname, nn);
3245 if (unconf)
3246 unhash_client_locked(unconf);
3247 if (conf && same_verf(&conf->cl_verifier, &clverifier)) {
3248 /* case 1: probable callback update */
3249 copy_clid(new, conf);
3250 gen_confirm(new, nn);
3251 } else /* case 4 (new client) or cases 2, 3 (client reboot): */
3252 gen_clid(new, nn);
3253 new->cl_minorversion = 0;
3254 gen_callback(new, setclid, rqstp);
3255 add_to_unconfirmed(new);
3256 setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
3257 setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
3258 memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
3259 new = NULL;
3260 status = nfs_ok;
3261 out:
3262 spin_unlock(&nn->client_lock);
3263 if (new)
3264 free_client(new);
3265 if (unconf)
3266 expire_client(unconf);
3267 return status;
3271 __be32
3272 nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
3273 struct nfsd4_compound_state *cstate,
3274 struct nfsd4_setclientid_confirm *setclientid_confirm)
3276 struct nfs4_client *conf, *unconf;
3277 struct nfs4_client *old = NULL;
3278 nfs4_verifier confirm = setclientid_confirm->sc_confirm;
3279 clientid_t * clid = &setclientid_confirm->sc_clientid;
3280 __be32 status;
3281 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
3283 if (STALE_CLIENTID(clid, nn))
3284 return nfserr_stale_clientid;
3286 spin_lock(&nn->client_lock);
3287 conf = find_confirmed_client(clid, false, nn);
3288 unconf = find_unconfirmed_client(clid, false, nn);
3290 * We try hard to give out unique clientid's, so if we get an
3291 * attempt to confirm the same clientid with a different cred,
3292 * the client may be buggy; this should never happen.
3294 * Nevertheless, RFC 7530 recommends INUSE for this case:
3296 status = nfserr_clid_inuse;
3297 if (unconf && !same_creds(&unconf->cl_cred, &rqstp->rq_cred))
3298 goto out;
3299 if (conf && !same_creds(&conf->cl_cred, &rqstp->rq_cred))
3300 goto out;
3301 /* cases below refer to rfc 3530 section 14.2.34: */
3302 if (!unconf || !same_verf(&confirm, &unconf->cl_confirm)) {
3303 if (conf && same_verf(&confirm, &conf->cl_confirm)) {
3304 /* case 2: probable retransmit */
3305 status = nfs_ok;
3306 } else /* case 4: client hasn't noticed we rebooted yet? */
3307 status = nfserr_stale_clientid;
3308 goto out;
3310 status = nfs_ok;
3311 if (conf) { /* case 1: callback update */
3312 old = unconf;
3313 unhash_client_locked(old);
3314 nfsd4_change_callback(conf, &unconf->cl_cb_conn);
3315 } else { /* case 3: normal case; new or rebooted client */
3316 old = find_confirmed_client_by_name(&unconf->cl_name, nn);
3317 if (old) {
3318 status = nfserr_clid_inuse;
3319 if (client_has_state(old)
3320 && !same_creds(&unconf->cl_cred,
3321 &old->cl_cred))
3322 goto out;
3323 status = mark_client_expired_locked(old);
3324 if (status) {
3325 old = NULL;
3326 goto out;
3329 move_to_confirmed(unconf);
3330 conf = unconf;
3332 get_client_locked(conf);
3333 spin_unlock(&nn->client_lock);
3334 nfsd4_probe_callback(conf);
3335 spin_lock(&nn->client_lock);
3336 put_client_renew_locked(conf);
3337 out:
3338 spin_unlock(&nn->client_lock);
3339 if (old)
3340 expire_client(old);
3341 return status;
3344 static struct nfs4_file *nfsd4_alloc_file(void)
3346 return kmem_cache_alloc(file_slab, GFP_KERNEL);
3349 /* OPEN Share state helper functions */
3350 static void nfsd4_init_file(struct knfsd_fh *fh, unsigned int hashval,
3351 struct nfs4_file *fp)
3353 lockdep_assert_held(&state_lock);
3355 atomic_set(&fp->fi_ref, 1);
3356 spin_lock_init(&fp->fi_lock);
3357 INIT_LIST_HEAD(&fp->fi_stateids);
3358 INIT_LIST_HEAD(&fp->fi_delegations);
3359 INIT_LIST_HEAD(&fp->fi_clnt_odstate);
3360 fh_copy_shallow(&fp->fi_fhandle, fh);
3361 fp->fi_deleg_file = NULL;
3362 fp->fi_had_conflict = false;
3363 fp->fi_share_deny = 0;
3364 memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
3365 memset(fp->fi_access, 0, sizeof(fp->fi_access));
3366 #ifdef CONFIG_NFSD_PNFS
3367 INIT_LIST_HEAD(&fp->fi_lo_states);
3368 atomic_set(&fp->fi_lo_recalls, 0);
3369 #endif
3370 hlist_add_head_rcu(&fp->fi_hash, &file_hashtbl[hashval]);
3373 void
3374 nfsd4_free_slabs(void)
3376 kmem_cache_destroy(odstate_slab);
3377 kmem_cache_destroy(openowner_slab);
3378 kmem_cache_destroy(lockowner_slab);
3379 kmem_cache_destroy(file_slab);
3380 kmem_cache_destroy(stateid_slab);
3381 kmem_cache_destroy(deleg_slab);
3385 nfsd4_init_slabs(void)
3387 openowner_slab = kmem_cache_create("nfsd4_openowners",
3388 sizeof(struct nfs4_openowner), 0, 0, NULL);
3389 if (openowner_slab == NULL)
3390 goto out;
3391 lockowner_slab = kmem_cache_create("nfsd4_lockowners",
3392 sizeof(struct nfs4_lockowner), 0, 0, NULL);
3393 if (lockowner_slab == NULL)
3394 goto out_free_openowner_slab;
3395 file_slab = kmem_cache_create("nfsd4_files",
3396 sizeof(struct nfs4_file), 0, 0, NULL);
3397 if (file_slab == NULL)
3398 goto out_free_lockowner_slab;
3399 stateid_slab = kmem_cache_create("nfsd4_stateids",
3400 sizeof(struct nfs4_ol_stateid), 0, 0, NULL);
3401 if (stateid_slab == NULL)
3402 goto out_free_file_slab;
3403 deleg_slab = kmem_cache_create("nfsd4_delegations",
3404 sizeof(struct nfs4_delegation), 0, 0, NULL);
3405 if (deleg_slab == NULL)
3406 goto out_free_stateid_slab;
3407 odstate_slab = kmem_cache_create("nfsd4_odstate",
3408 sizeof(struct nfs4_clnt_odstate), 0, 0, NULL);
3409 if (odstate_slab == NULL)
3410 goto out_free_deleg_slab;
3411 return 0;
3413 out_free_deleg_slab:
3414 kmem_cache_destroy(deleg_slab);
3415 out_free_stateid_slab:
3416 kmem_cache_destroy(stateid_slab);
3417 out_free_file_slab:
3418 kmem_cache_destroy(file_slab);
3419 out_free_lockowner_slab:
3420 kmem_cache_destroy(lockowner_slab);
3421 out_free_openowner_slab:
3422 kmem_cache_destroy(openowner_slab);
3423 out:
3424 dprintk("nfsd4: out of memory while initializing nfsv4\n");
3425 return -ENOMEM;
3428 static void init_nfs4_replay(struct nfs4_replay *rp)
3430 rp->rp_status = nfserr_serverfault;
3431 rp->rp_buflen = 0;
3432 rp->rp_buf = rp->rp_ibuf;
3433 mutex_init(&rp->rp_mutex);
3436 static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
3437 struct nfs4_stateowner *so)
3439 if (!nfsd4_has_session(cstate)) {
3440 mutex_lock(&so->so_replay.rp_mutex);
3441 cstate->replay_owner = nfs4_get_stateowner(so);
3445 void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
3447 struct nfs4_stateowner *so = cstate->replay_owner;
3449 if (so != NULL) {
3450 cstate->replay_owner = NULL;
3451 mutex_unlock(&so->so_replay.rp_mutex);
3452 nfs4_put_stateowner(so);
3456 static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
3458 struct nfs4_stateowner *sop;
3460 sop = kmem_cache_alloc(slab, GFP_KERNEL);
3461 if (!sop)
3462 return NULL;
3464 sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
3465 if (!sop->so_owner.data) {
3466 kmem_cache_free(slab, sop);
3467 return NULL;
3469 sop->so_owner.len = owner->len;
3471 INIT_LIST_HEAD(&sop->so_stateids);
3472 sop->so_client = clp;
3473 init_nfs4_replay(&sop->so_replay);
3474 atomic_set(&sop->so_count, 1);
3475 return sop;
3478 static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
3480 lockdep_assert_held(&clp->cl_lock);
3482 list_add(&oo->oo_owner.so_strhash,
3483 &clp->cl_ownerstr_hashtbl[strhashval]);
3484 list_add(&oo->oo_perclient, &clp->cl_openowners);
3487 static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
3489 unhash_openowner_locked(openowner(so));
3492 static void nfs4_free_openowner(struct nfs4_stateowner *so)
3494 struct nfs4_openowner *oo = openowner(so);
3496 kmem_cache_free(openowner_slab, oo);
3499 static const struct nfs4_stateowner_operations openowner_ops = {
3500 .so_unhash = nfs4_unhash_openowner,
3501 .so_free = nfs4_free_openowner,
3504 static struct nfs4_ol_stateid *
3505 nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
3507 struct nfs4_ol_stateid *local, *ret = NULL;
3508 struct nfs4_openowner *oo = open->op_openowner;
3510 lockdep_assert_held(&fp->fi_lock);
3512 list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
3513 /* ignore lock owners */
3514 if (local->st_stateowner->so_is_open_owner == 0)
3515 continue;
3516 if (local->st_stateowner == &oo->oo_owner) {
3517 ret = local;
3518 atomic_inc(&ret->st_stid.sc_count);
3519 break;
3522 return ret;
3525 static struct nfs4_openowner *
3526 alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
3527 struct nfsd4_compound_state *cstate)
3529 struct nfs4_client *clp = cstate->clp;
3530 struct nfs4_openowner *oo, *ret;
3532 oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
3533 if (!oo)
3534 return NULL;
3535 oo->oo_owner.so_ops = &openowner_ops;
3536 oo->oo_owner.so_is_open_owner = 1;
3537 oo->oo_owner.so_seqid = open->op_seqid;
3538 oo->oo_flags = 0;
3539 if (nfsd4_has_session(cstate))
3540 oo->oo_flags |= NFS4_OO_CONFIRMED;
3541 oo->oo_time = 0;
3542 oo->oo_last_closed_stid = NULL;
3543 INIT_LIST_HEAD(&oo->oo_close_lru);
3544 spin_lock(&clp->cl_lock);
3545 ret = find_openstateowner_str_locked(strhashval, open, clp);
3546 if (ret == NULL) {
3547 hash_openowner(oo, clp, strhashval);
3548 ret = oo;
3549 } else
3550 nfs4_free_stateowner(&oo->oo_owner);
3552 spin_unlock(&clp->cl_lock);
3553 return ret;
3556 static struct nfs4_ol_stateid *
3557 init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
3560 struct nfs4_openowner *oo = open->op_openowner;
3561 struct nfs4_ol_stateid *retstp = NULL;
3562 struct nfs4_ol_stateid *stp;
3564 stp = open->op_stp;
3565 /* We are moving these outside of the spinlocks to avoid the warnings */
3566 mutex_init(&stp->st_mutex);
3567 mutex_lock(&stp->st_mutex);
3569 spin_lock(&oo->oo_owner.so_client->cl_lock);
3570 spin_lock(&fp->fi_lock);
3572 retstp = nfsd4_find_existing_open(fp, open);
3573 if (retstp)
3574 goto out_unlock;
3576 open->op_stp = NULL;
3577 atomic_inc(&stp->st_stid.sc_count);
3578 stp->st_stid.sc_type = NFS4_OPEN_STID;
3579 INIT_LIST_HEAD(&stp->st_locks);
3580 stp->st_stateowner = nfs4_get_stateowner(&oo->oo_owner);
3581 get_nfs4_file(fp);
3582 stp->st_stid.sc_file = fp;
3583 stp->st_access_bmap = 0;
3584 stp->st_deny_bmap = 0;
3585 stp->st_openstp = NULL;
3586 list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
3587 list_add(&stp->st_perfile, &fp->fi_stateids);
3589 out_unlock:
3590 spin_unlock(&fp->fi_lock);
3591 spin_unlock(&oo->oo_owner.so_client->cl_lock);
3592 if (retstp) {
3593 mutex_lock(&retstp->st_mutex);
3594 /* To keep mutex tracking happy */
3595 mutex_unlock(&stp->st_mutex);
3596 stp = retstp;
3598 return stp;
3602 * In the 4.0 case we need to keep the owners around a little while to handle
3603 * CLOSE replay. We still do need to release any file access that is held by
3604 * them before returning however.
3606 static void
3607 move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
3609 struct nfs4_ol_stateid *last;
3610 struct nfs4_openowner *oo = openowner(s->st_stateowner);
3611 struct nfsd_net *nn = net_generic(s->st_stid.sc_client->net,
3612 nfsd_net_id);
3614 dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
3617 * We know that we hold one reference via nfsd4_close, and another
3618 * "persistent" reference for the client. If the refcount is higher
3619 * than 2, then there are still calls in progress that are using this
3620 * stateid. We can't put the sc_file reference until they are finished.
3621 * Wait for the refcount to drop to 2. Since it has been unhashed,
3622 * there should be no danger of the refcount going back up again at
3623 * this point.
3625 wait_event(close_wq, atomic_read(&s->st_stid.sc_count) == 2);
3627 release_all_access(s);
3628 if (s->st_stid.sc_file) {
3629 put_nfs4_file(s->st_stid.sc_file);
3630 s->st_stid.sc_file = NULL;
3633 spin_lock(&nn->client_lock);
3634 last = oo->oo_last_closed_stid;
3635 oo->oo_last_closed_stid = s;
3636 list_move_tail(&oo->oo_close_lru, &nn->close_lru);
3637 oo->oo_time = get_seconds();
3638 spin_unlock(&nn->client_lock);
3639 if (last)
3640 nfs4_put_stid(&last->st_stid);
3643 /* search file_hashtbl[] for file */
3644 static struct nfs4_file *
3645 find_file_locked(struct knfsd_fh *fh, unsigned int hashval)
3647 struct nfs4_file *fp;
3649 hlist_for_each_entry_rcu(fp, &file_hashtbl[hashval], fi_hash) {
3650 if (fh_match(&fp->fi_fhandle, fh)) {
3651 if (atomic_inc_not_zero(&fp->fi_ref))
3652 return fp;
3655 return NULL;
3658 struct nfs4_file *
3659 find_file(struct knfsd_fh *fh)
3661 struct nfs4_file *fp;
3662 unsigned int hashval = file_hashval(fh);
3664 rcu_read_lock();
3665 fp = find_file_locked(fh, hashval);
3666 rcu_read_unlock();
3667 return fp;
3670 static struct nfs4_file *
3671 find_or_add_file(struct nfs4_file *new, struct knfsd_fh *fh)
3673 struct nfs4_file *fp;
3674 unsigned int hashval = file_hashval(fh);
3676 rcu_read_lock();
3677 fp = find_file_locked(fh, hashval);
3678 rcu_read_unlock();
3679 if (fp)
3680 return fp;
3682 spin_lock(&state_lock);
3683 fp = find_file_locked(fh, hashval);
3684 if (likely(fp == NULL)) {
3685 nfsd4_init_file(fh, hashval, new);
3686 fp = new;
3688 spin_unlock(&state_lock);
3690 return fp;
3694 * Called to check deny when READ with all zero stateid or
3695 * WRITE with all zero or all one stateid
3697 static __be32
3698 nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
3700 struct nfs4_file *fp;
3701 __be32 ret = nfs_ok;
3703 fp = find_file(&current_fh->fh_handle);
3704 if (!fp)
3705 return ret;
3706 /* Check for conflicting share reservations */
3707 spin_lock(&fp->fi_lock);
3708 if (fp->fi_share_deny & deny_type)
3709 ret = nfserr_locked;
3710 spin_unlock(&fp->fi_lock);
3711 put_nfs4_file(fp);
3712 return ret;
3715 static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
3717 struct nfs4_delegation *dp = cb_to_delegation(cb);
3718 struct nfsd_net *nn = net_generic(dp->dl_stid.sc_client->net,
3719 nfsd_net_id);
3721 block_delegations(&dp->dl_stid.sc_file->fi_fhandle);
3724 * We can't do this in nfsd_break_deleg_cb because it is
3725 * already holding inode->i_lock.
3727 * If the dl_time != 0, then we know that it has already been
3728 * queued for a lease break. Don't queue it again.
3730 spin_lock(&state_lock);
3731 if (dp->dl_time == 0) {
3732 dp->dl_time = get_seconds();
3733 list_add_tail(&dp->dl_recall_lru, &nn->del_recall_lru);
3735 spin_unlock(&state_lock);
3738 static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
3739 struct rpc_task *task)
3741 struct nfs4_delegation *dp = cb_to_delegation(cb);
3743 if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID)
3744 return 1;
3746 switch (task->tk_status) {
3747 case 0:
3748 return 1;
3749 case -EBADHANDLE:
3750 case -NFS4ERR_BAD_STATEID:
3752 * Race: client probably got cb_recall before open reply
3753 * granting delegation.
3755 if (dp->dl_retries--) {
3756 rpc_delay(task, 2 * HZ);
3757 return 0;
3759 /*FALLTHRU*/
3760 default:
3761 return -1;
3765 static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
3767 struct nfs4_delegation *dp = cb_to_delegation(cb);
3769 nfs4_put_stid(&dp->dl_stid);
3772 static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
3773 .prepare = nfsd4_cb_recall_prepare,
3774 .done = nfsd4_cb_recall_done,
3775 .release = nfsd4_cb_recall_release,
3778 static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
3781 * We're assuming the state code never drops its reference
3782 * without first removing the lease. Since we're in this lease
3783 * callback (and since the lease code is serialized by the kernel
3784 * lock) we know the server hasn't removed the lease yet, we know
3785 * it's safe to take a reference.
3787 atomic_inc(&dp->dl_stid.sc_count);
3788 nfsd4_run_cb(&dp->dl_recall);
3791 /* Called from break_lease() with i_lock held. */
3792 static bool
3793 nfsd_break_deleg_cb(struct file_lock *fl)
3795 bool ret = false;
3796 struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
3797 struct nfs4_delegation *dp;
3799 if (!fp) {
3800 WARN(1, "(%p)->fl_owner NULL\n", fl);
3801 return ret;
3803 if (fp->fi_had_conflict) {
3804 WARN(1, "duplicate break on %p\n", fp);
3805 return ret;
3808 * We don't want the locks code to timeout the lease for us;
3809 * we'll remove it ourself if a delegation isn't returned
3810 * in time:
3812 fl->fl_break_time = 0;
3814 spin_lock(&fp->fi_lock);
3815 fp->fi_had_conflict = true;
3817 * If there are no delegations on the list, then return true
3818 * so that the lease code will go ahead and delete it.
3820 if (list_empty(&fp->fi_delegations))
3821 ret = true;
3822 else
3823 list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
3824 nfsd_break_one_deleg(dp);
3825 spin_unlock(&fp->fi_lock);
3826 return ret;
3829 static int
3830 nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
3831 struct list_head *dispose)
3833 if (arg & F_UNLCK)
3834 return lease_modify(onlist, arg, dispose);
3835 else
3836 return -EAGAIN;
3839 static const struct lock_manager_operations nfsd_lease_mng_ops = {
3840 .lm_break = nfsd_break_deleg_cb,
3841 .lm_change = nfsd_change_deleg_cb,
3844 static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
3846 if (nfsd4_has_session(cstate))
3847 return nfs_ok;
3848 if (seqid == so->so_seqid - 1)
3849 return nfserr_replay_me;
3850 if (seqid == so->so_seqid)
3851 return nfs_ok;
3852 return nfserr_bad_seqid;
3855 static __be32 lookup_clientid(clientid_t *clid,
3856 struct nfsd4_compound_state *cstate,
3857 struct nfsd_net *nn)
3859 struct nfs4_client *found;
3861 if (cstate->clp) {
3862 found = cstate->clp;
3863 if (!same_clid(&found->cl_clientid, clid))
3864 return nfserr_stale_clientid;
3865 return nfs_ok;
3868 if (STALE_CLIENTID(clid, nn))
3869 return nfserr_stale_clientid;
3872 * For v4.1+ we get the client in the SEQUENCE op. If we don't have one
3873 * cached already then we know this is for is for v4.0 and "sessions"
3874 * will be false.
3876 WARN_ON_ONCE(cstate->session);
3877 spin_lock(&nn->client_lock);
3878 found = find_confirmed_client(clid, false, nn);
3879 if (!found) {
3880 spin_unlock(&nn->client_lock);
3881 return nfserr_expired;
3883 atomic_inc(&found->cl_refcount);
3884 spin_unlock(&nn->client_lock);
3886 /* Cache the nfs4_client in cstate! */
3887 cstate->clp = found;
3888 return nfs_ok;
3891 __be32
3892 nfsd4_process_open1(struct nfsd4_compound_state *cstate,
3893 struct nfsd4_open *open, struct nfsd_net *nn)
3895 clientid_t *clientid = &open->op_clientid;
3896 struct nfs4_client *clp = NULL;
3897 unsigned int strhashval;
3898 struct nfs4_openowner *oo = NULL;
3899 __be32 status;
3901 if (STALE_CLIENTID(&open->op_clientid, nn))
3902 return nfserr_stale_clientid;
3904 * In case we need it later, after we've already created the
3905 * file and don't want to risk a further failure:
3907 open->op_file = nfsd4_alloc_file();
3908 if (open->op_file == NULL)
3909 return nfserr_jukebox;
3911 status = lookup_clientid(clientid, cstate, nn);
3912 if (status)
3913 return status;
3914 clp = cstate->clp;
3916 strhashval = ownerstr_hashval(&open->op_owner);
3917 oo = find_openstateowner_str(strhashval, open, clp);
3918 open->op_openowner = oo;
3919 if (!oo) {
3920 goto new_owner;
3922 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
3923 /* Replace unconfirmed owners without checking for replay. */
3924 release_openowner(oo);
3925 open->op_openowner = NULL;
3926 goto new_owner;
3928 status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
3929 if (status)
3930 return status;
3931 goto alloc_stateid;
3932 new_owner:
3933 oo = alloc_init_open_stateowner(strhashval, open, cstate);
3934 if (oo == NULL)
3935 return nfserr_jukebox;
3936 open->op_openowner = oo;
3937 alloc_stateid:
3938 open->op_stp = nfs4_alloc_open_stateid(clp);
3939 if (!open->op_stp)
3940 return nfserr_jukebox;
3942 if (nfsd4_has_session(cstate) &&
3943 (cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
3944 open->op_odstate = alloc_clnt_odstate(clp);
3945 if (!open->op_odstate)
3946 return nfserr_jukebox;
3949 return nfs_ok;
3952 static inline __be32
3953 nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
3955 if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
3956 return nfserr_openmode;
3957 else
3958 return nfs_ok;
3961 static int share_access_to_flags(u32 share_access)
3963 return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
3966 static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
3968 struct nfs4_stid *ret;
3970 ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
3971 if (!ret)
3972 return NULL;
3973 return delegstateid(ret);
3976 static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
3978 return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
3979 open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
3982 static __be32
3983 nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
3984 struct nfs4_delegation **dp)
3986 int flags;
3987 __be32 status = nfserr_bad_stateid;
3988 struct nfs4_delegation *deleg;
3990 deleg = find_deleg_stateid(cl, &open->op_delegate_stateid);
3991 if (deleg == NULL)
3992 goto out;
3993 flags = share_access_to_flags(open->op_share_access);
3994 status = nfs4_check_delegmode(deleg, flags);
3995 if (status) {
3996 nfs4_put_stid(&deleg->dl_stid);
3997 goto out;
3999 *dp = deleg;
4000 out:
4001 if (!nfsd4_is_deleg_cur(open))
4002 return nfs_ok;
4003 if (status)
4004 return status;
4005 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4006 return nfs_ok;
4009 static inline int nfs4_access_to_access(u32 nfs4_access)
4011 int flags = 0;
4013 if (nfs4_access & NFS4_SHARE_ACCESS_READ)
4014 flags |= NFSD_MAY_READ;
4015 if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
4016 flags |= NFSD_MAY_WRITE;
4017 return flags;
4020 static inline __be32
4021 nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
4022 struct nfsd4_open *open)
4024 struct iattr iattr = {
4025 .ia_valid = ATTR_SIZE,
4026 .ia_size = 0,
4028 if (!open->op_truncate)
4029 return 0;
4030 if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
4031 return nfserr_inval;
4032 return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
4035 static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
4036 struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
4037 struct nfsd4_open *open)
4039 struct file *filp = NULL;
4040 __be32 status;
4041 int oflag = nfs4_access_to_omode(open->op_share_access);
4042 int access = nfs4_access_to_access(open->op_share_access);
4043 unsigned char old_access_bmap, old_deny_bmap;
4045 spin_lock(&fp->fi_lock);
4048 * Are we trying to set a deny mode that would conflict with
4049 * current access?
4051 status = nfs4_file_check_deny(fp, open->op_share_deny);
4052 if (status != nfs_ok) {
4053 spin_unlock(&fp->fi_lock);
4054 goto out;
4057 /* set access to the file */
4058 status = nfs4_file_get_access(fp, open->op_share_access);
4059 if (status != nfs_ok) {
4060 spin_unlock(&fp->fi_lock);
4061 goto out;
4064 /* Set access bits in stateid */
4065 old_access_bmap = stp->st_access_bmap;
4066 set_access(open->op_share_access, stp);
4068 /* Set new deny mask */
4069 old_deny_bmap = stp->st_deny_bmap;
4070 set_deny(open->op_share_deny, stp);
4071 fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4073 if (!fp->fi_fds[oflag]) {
4074 spin_unlock(&fp->fi_lock);
4075 status = nfsd_open(rqstp, cur_fh, S_IFREG, access, &filp);
4076 if (status)
4077 goto out_put_access;
4078 spin_lock(&fp->fi_lock);
4079 if (!fp->fi_fds[oflag]) {
4080 fp->fi_fds[oflag] = filp;
4081 filp = NULL;
4084 spin_unlock(&fp->fi_lock);
4085 if (filp)
4086 fput(filp);
4088 status = nfsd4_truncate(rqstp, cur_fh, open);
4089 if (status)
4090 goto out_put_access;
4091 out:
4092 return status;
4093 out_put_access:
4094 stp->st_access_bmap = old_access_bmap;
4095 nfs4_file_put_access(fp, open->op_share_access);
4096 reset_union_bmap_deny(bmap_to_share_mode(old_deny_bmap), stp);
4097 goto out;
4100 static __be32
4101 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)
4103 __be32 status;
4104 unsigned char old_deny_bmap = stp->st_deny_bmap;
4106 if (!test_access(open->op_share_access, stp))
4107 return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open);
4109 /* test and set deny mode */
4110 spin_lock(&fp->fi_lock);
4111 status = nfs4_file_check_deny(fp, open->op_share_deny);
4112 if (status == nfs_ok) {
4113 set_deny(open->op_share_deny, stp);
4114 fp->fi_share_deny |=
4115 (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
4117 spin_unlock(&fp->fi_lock);
4119 if (status != nfs_ok)
4120 return status;
4122 status = nfsd4_truncate(rqstp, cur_fh, open);
4123 if (status != nfs_ok)
4124 reset_union_bmap_deny(old_deny_bmap, stp);
4125 return status;
4128 /* Should we give out recallable state?: */
4129 static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
4131 if (clp->cl_cb_state == NFSD4_CB_UP)
4132 return true;
4134 * In the sessions case, since we don't have to establish a
4135 * separate connection for callbacks, we assume it's OK
4136 * until we hear otherwise:
4138 return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
4141 static struct file_lock *nfs4_alloc_init_lease(struct nfs4_file *fp, int flag)
4143 struct file_lock *fl;
4145 fl = locks_alloc_lock();
4146 if (!fl)
4147 return NULL;
4148 fl->fl_lmops = &nfsd_lease_mng_ops;
4149 fl->fl_flags = FL_DELEG;
4150 fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
4151 fl->fl_end = OFFSET_MAX;
4152 fl->fl_owner = (fl_owner_t)fp;
4153 fl->fl_pid = current->tgid;
4154 return fl;
4158 * nfs4_setlease - Obtain a delegation by requesting lease from vfs layer
4159 * @dp: a pointer to the nfs4_delegation we're adding.
4161 * Return:
4162 * On success: Return code will be 0 on success.
4164 * On error: -EAGAIN if there was an existing delegation.
4165 * nonzero if there is an error in other cases.
4169 static int nfs4_setlease(struct nfs4_delegation *dp)
4171 struct nfs4_file *fp = dp->dl_stid.sc_file;
4172 struct file_lock *fl;
4173 struct file *filp;
4174 int status = 0;
4176 fl = nfs4_alloc_init_lease(fp, NFS4_OPEN_DELEGATE_READ);
4177 if (!fl)
4178 return -ENOMEM;
4179 filp = find_readable_file(fp);
4180 if (!filp) {
4181 /* We should always have a readable file here */
4182 WARN_ON_ONCE(1);
4183 locks_free_lock(fl);
4184 return -EBADF;
4186 fl->fl_file = filp;
4187 status = vfs_setlease(filp, fl->fl_type, &fl, NULL);
4188 if (fl)
4189 locks_free_lock(fl);
4190 if (status)
4191 goto out_fput;
4192 spin_lock(&state_lock);
4193 spin_lock(&fp->fi_lock);
4194 /* Did the lease get broken before we took the lock? */
4195 status = -EAGAIN;
4196 if (fp->fi_had_conflict)
4197 goto out_unlock;
4198 /* Race breaker */
4199 if (fp->fi_deleg_file) {
4200 status = hash_delegation_locked(dp, fp);
4201 goto out_unlock;
4203 fp->fi_deleg_file = filp;
4204 fp->fi_delegees = 0;
4205 status = hash_delegation_locked(dp, fp);
4206 spin_unlock(&fp->fi_lock);
4207 spin_unlock(&state_lock);
4208 if (status) {
4209 /* Should never happen, this is a new fi_deleg_file */
4210 WARN_ON_ONCE(1);
4211 goto out_fput;
4213 return 0;
4214 out_unlock:
4215 spin_unlock(&fp->fi_lock);
4216 spin_unlock(&state_lock);
4217 out_fput:
4218 fput(filp);
4219 return status;
4222 static struct nfs4_delegation *
4223 nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
4224 struct nfs4_file *fp, struct nfs4_clnt_odstate *odstate)
4226 int status;
4227 struct nfs4_delegation *dp;
4229 if (fp->fi_had_conflict)
4230 return ERR_PTR(-EAGAIN);
4232 spin_lock(&state_lock);
4233 spin_lock(&fp->fi_lock);
4234 status = nfs4_get_existing_delegation(clp, fp);
4235 spin_unlock(&fp->fi_lock);
4236 spin_unlock(&state_lock);
4238 if (status)
4239 return ERR_PTR(status);
4241 dp = alloc_init_deleg(clp, fh, odstate);
4242 if (!dp)
4243 return ERR_PTR(-ENOMEM);
4245 get_nfs4_file(fp);
4246 spin_lock(&state_lock);
4247 spin_lock(&fp->fi_lock);
4248 dp->dl_stid.sc_file = fp;
4249 if (!fp->fi_deleg_file) {
4250 spin_unlock(&fp->fi_lock);
4251 spin_unlock(&state_lock);
4252 status = nfs4_setlease(dp);
4253 goto out;
4255 if (fp->fi_had_conflict) {
4256 status = -EAGAIN;
4257 goto out_unlock;
4259 status = hash_delegation_locked(dp, fp);
4260 out_unlock:
4261 spin_unlock(&fp->fi_lock);
4262 spin_unlock(&state_lock);
4263 out:
4264 if (status) {
4265 put_clnt_odstate(dp->dl_clnt_odstate);
4266 nfs4_put_stid(&dp->dl_stid);
4267 return ERR_PTR(status);
4269 return dp;
4272 static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
4274 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4275 if (status == -EAGAIN)
4276 open->op_why_no_deleg = WND4_CONTENTION;
4277 else {
4278 open->op_why_no_deleg = WND4_RESOURCE;
4279 switch (open->op_deleg_want) {
4280 case NFS4_SHARE_WANT_READ_DELEG:
4281 case NFS4_SHARE_WANT_WRITE_DELEG:
4282 case NFS4_SHARE_WANT_ANY_DELEG:
4283 break;
4284 case NFS4_SHARE_WANT_CANCEL:
4285 open->op_why_no_deleg = WND4_CANCELLED;
4286 break;
4287 case NFS4_SHARE_WANT_NO_DELEG:
4288 WARN_ON_ONCE(1);
4294 * Attempt to hand out a delegation.
4296 * Note we don't support write delegations, and won't until the vfs has
4297 * proper support for them.
4299 static void
4300 nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open,
4301 struct nfs4_ol_stateid *stp)
4303 struct nfs4_delegation *dp;
4304 struct nfs4_openowner *oo = openowner(stp->st_stateowner);
4305 struct nfs4_client *clp = stp->st_stid.sc_client;
4306 int cb_up;
4307 int status = 0;
4309 cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
4310 open->op_recall = 0;
4311 switch (open->op_claim_type) {
4312 case NFS4_OPEN_CLAIM_PREVIOUS:
4313 if (!cb_up)
4314 open->op_recall = 1;
4315 if (open->op_delegate_type != NFS4_OPEN_DELEGATE_READ)
4316 goto out_no_deleg;
4317 break;
4318 case NFS4_OPEN_CLAIM_NULL:
4319 case NFS4_OPEN_CLAIM_FH:
4321 * Let's not give out any delegations till everyone's
4322 * had the chance to reclaim theirs, *and* until
4323 * NLM locks have all been reclaimed:
4325 if (locks_in_grace(clp->net))
4326 goto out_no_deleg;
4327 if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
4328 goto out_no_deleg;
4330 * Also, if the file was opened for write or
4331 * create, there's a good chance the client's
4332 * about to write to it, resulting in an
4333 * immediate recall (since we don't support
4334 * write delegations):
4336 if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
4337 goto out_no_deleg;
4338 if (open->op_create == NFS4_OPEN_CREATE)
4339 goto out_no_deleg;
4340 break;
4341 default:
4342 goto out_no_deleg;
4344 dp = nfs4_set_delegation(clp, fh, stp->st_stid.sc_file, stp->st_clnt_odstate);
4345 if (IS_ERR(dp))
4346 goto out_no_deleg;
4348 memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
4350 dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
4351 STATEID_VAL(&dp->dl_stid.sc_stateid));
4352 open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
4353 nfs4_put_stid(&dp->dl_stid);
4354 return;
4355 out_no_deleg:
4356 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
4357 if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
4358 open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
4359 dprintk("NFSD: WARNING: refusing delegation reclaim\n");
4360 open->op_recall = 1;
4363 /* 4.1 client asking for a delegation? */
4364 if (open->op_deleg_want)
4365 nfsd4_open_deleg_none_ext(open, status);
4366 return;
4369 static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
4370 struct nfs4_delegation *dp)
4372 if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
4373 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4374 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4375 open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
4376 } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
4377 dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
4378 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4379 open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
4381 /* Otherwise the client must be confused wanting a delegation
4382 * it already has, therefore we don't return
4383 * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
4387 __be32
4388 nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
4390 struct nfsd4_compoundres *resp = rqstp->rq_resp;
4391 struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
4392 struct nfs4_file *fp = NULL;
4393 struct nfs4_ol_stateid *stp = NULL;
4394 struct nfs4_delegation *dp = NULL;
4395 __be32 status;
4398 * Lookup file; if found, lookup stateid and check open request,
4399 * and check for delegations in the process of being recalled.
4400 * If not found, create the nfs4_file struct
4402 fp = find_or_add_file(open->op_file, &current_fh->fh_handle);
4403 if (fp != open->op_file) {
4404 status = nfs4_check_deleg(cl, open, &dp);
4405 if (status)
4406 goto out;
4407 spin_lock(&fp->fi_lock);
4408 stp = nfsd4_find_existing_open(fp, open);
4409 spin_unlock(&fp->fi_lock);
4410 } else {
4411 open->op_file = NULL;
4412 status = nfserr_bad_stateid;
4413 if (nfsd4_is_deleg_cur(open))
4414 goto out;
4418 * OPEN the file, or upgrade an existing OPEN.
4419 * If truncate fails, the OPEN fails.
4421 if (stp) {
4422 /* Stateid was found, this is an OPEN upgrade */
4423 mutex_lock(&stp->st_mutex);
4424 status = nfs4_upgrade_open(rqstp, fp, current_fh, stp, open);
4425 if (status) {
4426 mutex_unlock(&stp->st_mutex);
4427 goto out;
4429 } else {
4430 /* stp is returned locked. */
4431 stp = init_open_stateid(fp, open);
4432 /* See if we lost the race to some other thread */
4433 if (stp->st_access_bmap != 0) {
4434 status = nfs4_upgrade_open(rqstp, fp, current_fh,
4435 stp, open);
4436 if (status) {
4437 mutex_unlock(&stp->st_mutex);
4438 goto out;
4440 goto upgrade_out;
4442 status = nfs4_get_vfs_file(rqstp, fp, current_fh, stp, open);
4443 if (status) {
4444 mutex_unlock(&stp->st_mutex);
4445 release_open_stateid(stp);
4446 goto out;
4449 stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
4450 open->op_odstate);
4451 if (stp->st_clnt_odstate == open->op_odstate)
4452 open->op_odstate = NULL;
4454 upgrade_out:
4455 nfs4_inc_and_copy_stateid(&open->op_stateid, &stp->st_stid);
4456 mutex_unlock(&stp->st_mutex);
4458 if (nfsd4_has_session(&resp->cstate)) {
4459 if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
4460 open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
4461 open->op_why_no_deleg = WND4_NOT_WANTED;
4462 goto nodeleg;
4467 * Attempt to hand out a delegation. No error return, because the
4468 * OPEN succeeds even if we fail.
4470 nfs4_open_delegation(current_fh, open, stp);
4471 nodeleg:
4472 status = nfs_ok;
4474 dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
4475 STATEID_VAL(&stp->st_stid.sc_stateid));
4476 out:
4477 /* 4.1 client trying to upgrade/downgrade delegation? */
4478 if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
4479 open->op_deleg_want)
4480 nfsd4_deleg_xgrade_none_ext(open, dp);
4482 if (fp)
4483 put_nfs4_file(fp);
4484 if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
4485 open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
4487 * To finish the open response, we just need to set the rflags.
4489 open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
4490 if (nfsd4_has_session(&resp->cstate))
4491 open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
4492 else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
4493 open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
4495 if (dp)
4496 nfs4_put_stid(&dp->dl_stid);
4497 if (stp)
4498 nfs4_put_stid(&stp->st_stid);
4500 return status;
4503 void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
4504 struct nfsd4_open *open)
4506 if (open->op_openowner) {
4507 struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
4509 nfsd4_cstate_assign_replay(cstate, so);
4510 nfs4_put_stateowner(so);
4512 if (open->op_file)
4513 kmem_cache_free(file_slab, open->op_file);
4514 if (open->op_stp)
4515 nfs4_put_stid(&open->op_stp->st_stid);
4516 if (open->op_odstate)
4517 kmem_cache_free(odstate_slab, open->op_odstate);
4520 __be32
4521 nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4522 clientid_t *clid)
4524 struct nfs4_client *clp;
4525 __be32 status;
4526 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
4528 dprintk("process_renew(%08x/%08x): starting\n",
4529 clid->cl_boot, clid->cl_id);
4530 status = lookup_clientid(clid, cstate, nn);
4531 if (status)
4532 goto out;
4533 clp = cstate->clp;
4534 status = nfserr_cb_path_down;
4535 if (!list_empty(&clp->cl_delegations)
4536 && clp->cl_cb_state != NFSD4_CB_UP)
4537 goto out;
4538 status = nfs_ok;
4539 out:
4540 return status;
4543 void
4544 nfsd4_end_grace(struct nfsd_net *nn)
4546 /* do nothing if grace period already ended */
4547 if (nn->grace_ended)
4548 return;
4550 dprintk("NFSD: end of grace period\n");
4551 nn->grace_ended = true;
4553 * If the server goes down again right now, an NFSv4
4554 * client will still be allowed to reclaim after it comes back up,
4555 * even if it hasn't yet had a chance to reclaim state this time.
4558 nfsd4_record_grace_done(nn);
4560 * At this point, NFSv4 clients can still reclaim. But if the
4561 * server crashes, any that have not yet reclaimed will be out
4562 * of luck on the next boot.
4564 * (NFSv4.1+ clients are considered to have reclaimed once they
4565 * call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
4566 * have reclaimed after their first OPEN.)
4568 locks_end_grace(&nn->nfsd4_manager);
4570 * At this point, and once lockd and/or any other containers
4571 * exit their grace period, further reclaims will fail and
4572 * regular locking can resume.
4576 static time_t
4577 nfs4_laundromat(struct nfsd_net *nn)
4579 struct nfs4_client *clp;
4580 struct nfs4_openowner *oo;
4581 struct nfs4_delegation *dp;
4582 struct nfs4_ol_stateid *stp;
4583 struct nfsd4_blocked_lock *nbl;
4584 struct list_head *pos, *next, reaplist;
4585 time_t cutoff = get_seconds() - nn->nfsd4_lease;
4586 time_t t, new_timeo = nn->nfsd4_lease;
4588 dprintk("NFSD: laundromat service - starting\n");
4589 nfsd4_end_grace(nn);
4590 INIT_LIST_HEAD(&reaplist);
4591 spin_lock(&nn->client_lock);
4592 list_for_each_safe(pos, next, &nn->client_lru) {
4593 clp = list_entry(pos, struct nfs4_client, cl_lru);
4594 if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
4595 t = clp->cl_time - cutoff;
4596 new_timeo = min(new_timeo, t);
4597 break;
4599 if (mark_client_expired_locked(clp)) {
4600 dprintk("NFSD: client in use (clientid %08x)\n",
4601 clp->cl_clientid.cl_id);
4602 continue;
4604 list_add(&clp->cl_lru, &reaplist);
4606 spin_unlock(&nn->client_lock);
4607 list_for_each_safe(pos, next, &reaplist) {
4608 clp = list_entry(pos, struct nfs4_client, cl_lru);
4609 dprintk("NFSD: purging unused client (clientid %08x)\n",
4610 clp->cl_clientid.cl_id);
4611 list_del_init(&clp->cl_lru);
4612 expire_client(clp);
4614 spin_lock(&state_lock);
4615 list_for_each_safe(pos, next, &nn->del_recall_lru) {
4616 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
4617 if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
4618 t = dp->dl_time - cutoff;
4619 new_timeo = min(new_timeo, t);
4620 break;
4622 WARN_ON(!unhash_delegation_locked(dp));
4623 list_add(&dp->dl_recall_lru, &reaplist);
4625 spin_unlock(&state_lock);
4626 while (!list_empty(&reaplist)) {
4627 dp = list_first_entry(&reaplist, struct nfs4_delegation,
4628 dl_recall_lru);
4629 list_del_init(&dp->dl_recall_lru);
4630 revoke_delegation(dp);
4633 spin_lock(&nn->client_lock);
4634 while (!list_empty(&nn->close_lru)) {
4635 oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
4636 oo_close_lru);
4637 if (time_after((unsigned long)oo->oo_time,
4638 (unsigned long)cutoff)) {
4639 t = oo->oo_time - cutoff;
4640 new_timeo = min(new_timeo, t);
4641 break;
4643 list_del_init(&oo->oo_close_lru);
4644 stp = oo->oo_last_closed_stid;
4645 oo->oo_last_closed_stid = NULL;
4646 spin_unlock(&nn->client_lock);
4647 nfs4_put_stid(&stp->st_stid);
4648 spin_lock(&nn->client_lock);
4650 spin_unlock(&nn->client_lock);
4653 * It's possible for a client to try and acquire an already held lock
4654 * that is being held for a long time, and then lose interest in it.
4655 * So, we clean out any un-revisited request after a lease period
4656 * under the assumption that the client is no longer interested.
4658 * RFC5661, sec. 9.6 states that the client must not rely on getting
4659 * notifications and must continue to poll for locks, even when the
4660 * server supports them. Thus this shouldn't lead to clients blocking
4661 * indefinitely once the lock does become free.
4663 BUG_ON(!list_empty(&reaplist));
4664 spin_lock(&nn->blocked_locks_lock);
4665 while (!list_empty(&nn->blocked_locks_lru)) {
4666 nbl = list_first_entry(&nn->blocked_locks_lru,
4667 struct nfsd4_blocked_lock, nbl_lru);
4668 if (time_after((unsigned long)nbl->nbl_time,
4669 (unsigned long)cutoff)) {
4670 t = nbl->nbl_time - cutoff;
4671 new_timeo = min(new_timeo, t);
4672 break;
4674 list_move(&nbl->nbl_lru, &reaplist);
4675 list_del_init(&nbl->nbl_list);
4677 spin_unlock(&nn->blocked_locks_lock);
4679 while (!list_empty(&reaplist)) {
4680 nbl = list_first_entry(&nn->blocked_locks_lru,
4681 struct nfsd4_blocked_lock, nbl_lru);
4682 list_del_init(&nbl->nbl_lru);
4683 posix_unblock_lock(&nbl->nbl_lock);
4684 free_blocked_lock(nbl);
4687 new_timeo = max_t(time_t, new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
4688 return new_timeo;
4691 static struct workqueue_struct *laundry_wq;
4692 static void laundromat_main(struct work_struct *);
4694 static void
4695 laundromat_main(struct work_struct *laundry)
4697 time_t t;
4698 struct delayed_work *dwork = to_delayed_work(laundry);
4699 struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
4700 laundromat_work);
4702 t = nfs4_laundromat(nn);
4703 dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
4704 queue_delayed_work(laundry_wq, &nn->laundromat_work, t*HZ);
4707 static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
4709 if (!fh_match(&fhp->fh_handle, &stp->sc_file->fi_fhandle))
4710 return nfserr_bad_stateid;
4711 return nfs_ok;
4714 static inline int
4715 access_permit_read(struct nfs4_ol_stateid *stp)
4717 return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
4718 test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
4719 test_access(NFS4_SHARE_ACCESS_WRITE, stp);
4722 static inline int
4723 access_permit_write(struct nfs4_ol_stateid *stp)
4725 return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
4726 test_access(NFS4_SHARE_ACCESS_BOTH, stp);
4729 static
4730 __be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
4732 __be32 status = nfserr_openmode;
4734 /* For lock stateid's, we test the parent open, not the lock: */
4735 if (stp->st_openstp)
4736 stp = stp->st_openstp;
4737 if ((flags & WR_STATE) && !access_permit_write(stp))
4738 goto out;
4739 if ((flags & RD_STATE) && !access_permit_read(stp))
4740 goto out;
4741 status = nfs_ok;
4742 out:
4743 return status;
4746 static inline __be32
4747 check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
4749 if (ONE_STATEID(stateid) && (flags & RD_STATE))
4750 return nfs_ok;
4751 else if (opens_in_grace(net)) {
4752 /* Answer in remaining cases depends on existence of
4753 * conflicting state; so we must wait out the grace period. */
4754 return nfserr_grace;
4755 } else if (flags & WR_STATE)
4756 return nfs4_share_conflict(current_fh,
4757 NFS4_SHARE_DENY_WRITE);
4758 else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
4759 return nfs4_share_conflict(current_fh,
4760 NFS4_SHARE_DENY_READ);
4764 * Allow READ/WRITE during grace period on recovered state only for files
4765 * that are not able to provide mandatory locking.
4767 static inline int
4768 grace_disallows_io(struct net *net, struct inode *inode)
4770 return opens_in_grace(net) && mandatory_lock(inode);
4773 static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
4776 * When sessions are used the stateid generation number is ignored
4777 * when it is zero.
4779 if (has_session && in->si_generation == 0)
4780 return nfs_ok;
4782 if (in->si_generation == ref->si_generation)
4783 return nfs_ok;
4785 /* If the client sends us a stateid from the future, it's buggy: */
4786 if (nfsd4_stateid_generation_after(in, ref))
4787 return nfserr_bad_stateid;
4789 * However, we could see a stateid from the past, even from a
4790 * non-buggy client. For example, if the client sends a lock
4791 * while some IO is outstanding, the lock may bump si_generation
4792 * while the IO is still in flight. The client could avoid that
4793 * situation by waiting for responses on all the IO requests,
4794 * but better performance may result in retrying IO that
4795 * receives an old_stateid error if requests are rarely
4796 * reordered in flight:
4798 return nfserr_old_stateid;
4801 static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
4803 if (ols->st_stateowner->so_is_open_owner &&
4804 !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
4805 return nfserr_bad_stateid;
4806 return nfs_ok;
4809 static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
4811 struct nfs4_stid *s;
4812 __be32 status = nfserr_bad_stateid;
4814 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4815 return status;
4816 /* Client debugging aid. */
4817 if (!same_clid(&stateid->si_opaque.so_clid, &cl->cl_clientid)) {
4818 char addr_str[INET6_ADDRSTRLEN];
4819 rpc_ntop((struct sockaddr *)&cl->cl_addr, addr_str,
4820 sizeof(addr_str));
4821 pr_warn_ratelimited("NFSD: client %s testing state ID "
4822 "with incorrect client ID\n", addr_str);
4823 return status;
4825 spin_lock(&cl->cl_lock);
4826 s = find_stateid_locked(cl, stateid);
4827 if (!s)
4828 goto out_unlock;
4829 status = check_stateid_generation(stateid, &s->sc_stateid, 1);
4830 if (status)
4831 goto out_unlock;
4832 switch (s->sc_type) {
4833 case NFS4_DELEG_STID:
4834 status = nfs_ok;
4835 break;
4836 case NFS4_REVOKED_DELEG_STID:
4837 status = nfserr_deleg_revoked;
4838 break;
4839 case NFS4_OPEN_STID:
4840 case NFS4_LOCK_STID:
4841 status = nfsd4_check_openowner_confirmed(openlockstateid(s));
4842 break;
4843 default:
4844 printk("unknown stateid type %x\n", s->sc_type);
4845 /* Fallthrough */
4846 case NFS4_CLOSED_STID:
4847 case NFS4_CLOSED_DELEG_STID:
4848 status = nfserr_bad_stateid;
4850 out_unlock:
4851 spin_unlock(&cl->cl_lock);
4852 return status;
4855 __be32
4856 nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
4857 stateid_t *stateid, unsigned char typemask,
4858 struct nfs4_stid **s, struct nfsd_net *nn)
4860 __be32 status;
4862 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
4863 return nfserr_bad_stateid;
4864 status = lookup_clientid(&stateid->si_opaque.so_clid, cstate, nn);
4865 if (status == nfserr_stale_clientid) {
4866 if (cstate->session)
4867 return nfserr_bad_stateid;
4868 return nfserr_stale_stateid;
4870 if (status)
4871 return status;
4872 *s = find_stateid_by_type(cstate->clp, stateid, typemask);
4873 if (!*s)
4874 return nfserr_bad_stateid;
4875 return nfs_ok;
4878 static struct file *
4879 nfs4_find_file(struct nfs4_stid *s, int flags)
4881 if (!s)
4882 return NULL;
4884 switch (s->sc_type) {
4885 case NFS4_DELEG_STID:
4886 if (WARN_ON_ONCE(!s->sc_file->fi_deleg_file))
4887 return NULL;
4888 return get_file(s->sc_file->fi_deleg_file);
4889 case NFS4_OPEN_STID:
4890 case NFS4_LOCK_STID:
4891 if (flags & RD_STATE)
4892 return find_readable_file(s->sc_file);
4893 else
4894 return find_writeable_file(s->sc_file);
4895 break;
4898 return NULL;
4901 static __be32
4902 nfs4_check_olstateid(struct svc_fh *fhp, struct nfs4_ol_stateid *ols, int flags)
4904 __be32 status;
4906 status = nfsd4_check_openowner_confirmed(ols);
4907 if (status)
4908 return status;
4909 return nfs4_check_openmode(ols, flags);
4912 static __be32
4913 nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
4914 struct file **filpp, bool *tmp_file, int flags)
4916 int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
4917 struct file *file;
4918 __be32 status;
4920 file = nfs4_find_file(s, flags);
4921 if (file) {
4922 status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
4923 acc | NFSD_MAY_OWNER_OVERRIDE);
4924 if (status) {
4925 fput(file);
4926 return status;
4929 *filpp = file;
4930 } else {
4931 status = nfsd_open(rqstp, fhp, S_IFREG, acc, filpp);
4932 if (status)
4933 return status;
4935 if (tmp_file)
4936 *tmp_file = true;
4939 return 0;
4943 * Checks for stateid operations
4945 __be32
4946 nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
4947 struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
4948 stateid_t *stateid, int flags, struct file **filpp, bool *tmp_file)
4950 struct inode *ino = d_inode(fhp->fh_dentry);
4951 struct net *net = SVC_NET(rqstp);
4952 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
4953 struct nfs4_stid *s = NULL;
4954 __be32 status;
4956 if (filpp)
4957 *filpp = NULL;
4958 if (tmp_file)
4959 *tmp_file = false;
4961 if (grace_disallows_io(net, ino))
4962 return nfserr_grace;
4964 if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
4965 status = check_special_stateids(net, fhp, stateid, flags);
4966 goto done;
4969 status = nfsd4_lookup_stateid(cstate, stateid,
4970 NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
4971 &s, nn);
4972 if (status)
4973 return status;
4974 status = check_stateid_generation(stateid, &s->sc_stateid,
4975 nfsd4_has_session(cstate));
4976 if (status)
4977 goto out;
4979 switch (s->sc_type) {
4980 case NFS4_DELEG_STID:
4981 status = nfs4_check_delegmode(delegstateid(s), flags);
4982 break;
4983 case NFS4_OPEN_STID:
4984 case NFS4_LOCK_STID:
4985 status = nfs4_check_olstateid(fhp, openlockstateid(s), flags);
4986 break;
4987 default:
4988 status = nfserr_bad_stateid;
4989 break;
4991 if (status)
4992 goto out;
4993 status = nfs4_check_fh(fhp, s);
4995 done:
4996 if (!status && filpp)
4997 status = nfs4_check_file(rqstp, fhp, s, filpp, tmp_file, flags);
4998 out:
4999 if (s)
5000 nfs4_put_stid(s);
5001 return status;
5005 * Test if the stateid is valid
5007 __be32
5008 nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5009 struct nfsd4_test_stateid *test_stateid)
5011 struct nfsd4_test_stateid_id *stateid;
5012 struct nfs4_client *cl = cstate->session->se_client;
5014 list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
5015 stateid->ts_id_status =
5016 nfsd4_validate_stateid(cl, &stateid->ts_id_stateid);
5018 return nfs_ok;
5021 static __be32
5022 nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
5024 struct nfs4_ol_stateid *stp = openlockstateid(s);
5025 __be32 ret;
5027 mutex_lock(&stp->st_mutex);
5029 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5030 if (ret)
5031 goto out;
5033 ret = nfserr_locks_held;
5034 if (check_for_locks(stp->st_stid.sc_file,
5035 lockowner(stp->st_stateowner)))
5036 goto out;
5038 release_lock_stateid(stp);
5039 ret = nfs_ok;
5041 out:
5042 mutex_unlock(&stp->st_mutex);
5043 nfs4_put_stid(s);
5044 return ret;
5047 __be32
5048 nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5049 struct nfsd4_free_stateid *free_stateid)
5051 stateid_t *stateid = &free_stateid->fr_stateid;
5052 struct nfs4_stid *s;
5053 struct nfs4_delegation *dp;
5054 struct nfs4_client *cl = cstate->session->se_client;
5055 __be32 ret = nfserr_bad_stateid;
5057 spin_lock(&cl->cl_lock);
5058 s = find_stateid_locked(cl, stateid);
5059 if (!s)
5060 goto out_unlock;
5061 switch (s->sc_type) {
5062 case NFS4_DELEG_STID:
5063 ret = nfserr_locks_held;
5064 break;
5065 case NFS4_OPEN_STID:
5066 ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
5067 if (ret)
5068 break;
5069 ret = nfserr_locks_held;
5070 break;
5071 case NFS4_LOCK_STID:
5072 atomic_inc(&s->sc_count);
5073 spin_unlock(&cl->cl_lock);
5074 ret = nfsd4_free_lock_stateid(stateid, s);
5075 goto out;
5076 case NFS4_REVOKED_DELEG_STID:
5077 dp = delegstateid(s);
5078 list_del_init(&dp->dl_recall_lru);
5079 spin_unlock(&cl->cl_lock);
5080 nfs4_put_stid(s);
5081 ret = nfs_ok;
5082 goto out;
5083 /* Default falls through and returns nfserr_bad_stateid */
5085 out_unlock:
5086 spin_unlock(&cl->cl_lock);
5087 out:
5088 return ret;
5091 static inline int
5092 setlkflg (int type)
5094 return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
5095 RD_STATE : WR_STATE;
5098 static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
5100 struct svc_fh *current_fh = &cstate->current_fh;
5101 struct nfs4_stateowner *sop = stp->st_stateowner;
5102 __be32 status;
5104 status = nfsd4_check_seqid(cstate, sop, seqid);
5105 if (status)
5106 return status;
5107 if (stp->st_stid.sc_type == NFS4_CLOSED_STID
5108 || stp->st_stid.sc_type == NFS4_REVOKED_DELEG_STID)
5110 * "Closed" stateid's exist *only* to return
5111 * nfserr_replay_me from the previous step, and
5112 * revoked delegations are kept only for free_stateid.
5114 return nfserr_bad_stateid;
5115 mutex_lock(&stp->st_mutex);
5116 status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
5117 if (status == nfs_ok)
5118 status = nfs4_check_fh(current_fh, &stp->st_stid);
5119 if (status != nfs_ok)
5120 mutex_unlock(&stp->st_mutex);
5121 return status;
5125 * Checks for sequence id mutating operations.
5127 static __be32
5128 nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5129 stateid_t *stateid, char typemask,
5130 struct nfs4_ol_stateid **stpp,
5131 struct nfsd_net *nn)
5133 __be32 status;
5134 struct nfs4_stid *s;
5135 struct nfs4_ol_stateid *stp = NULL;
5137 dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
5138 seqid, STATEID_VAL(stateid));
5140 *stpp = NULL;
5141 status = nfsd4_lookup_stateid(cstate, stateid, typemask, &s, nn);
5142 if (status)
5143 return status;
5144 stp = openlockstateid(s);
5145 nfsd4_cstate_assign_replay(cstate, stp->st_stateowner);
5147 status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
5148 if (!status)
5149 *stpp = stp;
5150 else
5151 nfs4_put_stid(&stp->st_stid);
5152 return status;
5155 static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
5156 stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
5158 __be32 status;
5159 struct nfs4_openowner *oo;
5160 struct nfs4_ol_stateid *stp;
5162 status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
5163 NFS4_OPEN_STID, &stp, nn);
5164 if (status)
5165 return status;
5166 oo = openowner(stp->st_stateowner);
5167 if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5168 mutex_unlock(&stp->st_mutex);
5169 nfs4_put_stid(&stp->st_stid);
5170 return nfserr_bad_stateid;
5172 *stpp = stp;
5173 return nfs_ok;
5176 __be32
5177 nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5178 struct nfsd4_open_confirm *oc)
5180 __be32 status;
5181 struct nfs4_openowner *oo;
5182 struct nfs4_ol_stateid *stp;
5183 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5185 dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
5186 cstate->current_fh.fh_dentry);
5188 status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
5189 if (status)
5190 return status;
5192 status = nfs4_preprocess_seqid_op(cstate,
5193 oc->oc_seqid, &oc->oc_req_stateid,
5194 NFS4_OPEN_STID, &stp, nn);
5195 if (status)
5196 goto out;
5197 oo = openowner(stp->st_stateowner);
5198 status = nfserr_bad_stateid;
5199 if (oo->oo_flags & NFS4_OO_CONFIRMED) {
5200 mutex_unlock(&stp->st_mutex);
5201 goto put_stateid;
5203 oo->oo_flags |= NFS4_OO_CONFIRMED;
5204 nfs4_inc_and_copy_stateid(&oc->oc_resp_stateid, &stp->st_stid);
5205 mutex_unlock(&stp->st_mutex);
5206 dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
5207 __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
5209 nfsd4_client_record_create(oo->oo_owner.so_client);
5210 status = nfs_ok;
5211 put_stateid:
5212 nfs4_put_stid(&stp->st_stid);
5213 out:
5214 nfsd4_bump_seqid(cstate, status);
5215 return status;
5218 static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
5220 if (!test_access(access, stp))
5221 return;
5222 nfs4_file_put_access(stp->st_stid.sc_file, access);
5223 clear_access(access, stp);
5226 static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
5228 switch (to_access) {
5229 case NFS4_SHARE_ACCESS_READ:
5230 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
5231 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5232 break;
5233 case NFS4_SHARE_ACCESS_WRITE:
5234 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
5235 nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
5236 break;
5237 case NFS4_SHARE_ACCESS_BOTH:
5238 break;
5239 default:
5240 WARN_ON_ONCE(1);
5244 __be32
5245 nfsd4_open_downgrade(struct svc_rqst *rqstp,
5246 struct nfsd4_compound_state *cstate,
5247 struct nfsd4_open_downgrade *od)
5249 __be32 status;
5250 struct nfs4_ol_stateid *stp;
5251 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5253 dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
5254 cstate->current_fh.fh_dentry);
5256 /* We don't yet support WANT bits: */
5257 if (od->od_deleg_want)
5258 dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
5259 od->od_deleg_want);
5261 status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
5262 &od->od_stateid, &stp, nn);
5263 if (status)
5264 goto out;
5265 status = nfserr_inval;
5266 if (!test_access(od->od_share_access, stp)) {
5267 dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
5268 stp->st_access_bmap, od->od_share_access);
5269 goto put_stateid;
5271 if (!test_deny(od->od_share_deny, stp)) {
5272 dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
5273 stp->st_deny_bmap, od->od_share_deny);
5274 goto put_stateid;
5276 nfs4_stateid_downgrade(stp, od->od_share_access);
5277 reset_union_bmap_deny(od->od_share_deny, stp);
5278 nfs4_inc_and_copy_stateid(&od->od_stateid, &stp->st_stid);
5279 status = nfs_ok;
5280 put_stateid:
5281 mutex_unlock(&stp->st_mutex);
5282 nfs4_put_stid(&stp->st_stid);
5283 out:
5284 nfsd4_bump_seqid(cstate, status);
5285 return status;
5288 static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
5290 struct nfs4_client *clp = s->st_stid.sc_client;
5291 bool unhashed;
5292 LIST_HEAD(reaplist);
5294 s->st_stid.sc_type = NFS4_CLOSED_STID;
5295 spin_lock(&clp->cl_lock);
5296 unhashed = unhash_open_stateid(s, &reaplist);
5298 if (clp->cl_minorversion) {
5299 if (unhashed)
5300 put_ol_stateid_locked(s, &reaplist);
5301 spin_unlock(&clp->cl_lock);
5302 free_ol_stateid_reaplist(&reaplist);
5303 } else {
5304 spin_unlock(&clp->cl_lock);
5305 free_ol_stateid_reaplist(&reaplist);
5306 if (unhashed)
5307 move_to_close_lru(s, clp->net);
5312 * nfs4_unlock_state() called after encode
5314 __be32
5315 nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5316 struct nfsd4_close *close)
5318 __be32 status;
5319 struct nfs4_ol_stateid *stp;
5320 struct net *net = SVC_NET(rqstp);
5321 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5323 dprintk("NFSD: nfsd4_close on file %pd\n",
5324 cstate->current_fh.fh_dentry);
5326 status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
5327 &close->cl_stateid,
5328 NFS4_OPEN_STID|NFS4_CLOSED_STID,
5329 &stp, nn);
5330 nfsd4_bump_seqid(cstate, status);
5331 if (status)
5332 goto out;
5333 nfs4_inc_and_copy_stateid(&close->cl_stateid, &stp->st_stid);
5334 mutex_unlock(&stp->st_mutex);
5336 nfsd4_close_open_stateid(stp);
5338 /* put reference from nfs4_preprocess_seqid_op */
5339 nfs4_put_stid(&stp->st_stid);
5340 out:
5341 return status;
5344 __be32
5345 nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5346 struct nfsd4_delegreturn *dr)
5348 struct nfs4_delegation *dp;
5349 stateid_t *stateid = &dr->dr_stateid;
5350 struct nfs4_stid *s;
5351 __be32 status;
5352 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5354 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5355 return status;
5357 status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, &s, nn);
5358 if (status)
5359 goto out;
5360 dp = delegstateid(s);
5361 status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
5362 if (status)
5363 goto put_stateid;
5365 destroy_delegation(dp);
5366 put_stateid:
5367 nfs4_put_stid(&dp->dl_stid);
5368 out:
5369 return status;
5372 static inline u64
5373 end_offset(u64 start, u64 len)
5375 u64 end;
5377 end = start + len;
5378 return end >= start ? end: NFS4_MAX_UINT64;
5381 /* last octet in a range */
5382 static inline u64
5383 last_byte_offset(u64 start, u64 len)
5385 u64 end;
5387 WARN_ON_ONCE(!len);
5388 end = start + len;
5389 return end > start ? end - 1: NFS4_MAX_UINT64;
5393 * TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
5394 * we can't properly handle lock requests that go beyond the (2^63 - 1)-th
5395 * byte, because of sign extension problems. Since NFSv4 calls for 64-bit
5396 * locking, this prevents us from being completely protocol-compliant. The
5397 * real solution to this problem is to start using unsigned file offsets in
5398 * the VFS, but this is a very deep change!
5400 static inline void
5401 nfs4_transform_lock_offset(struct file_lock *lock)
5403 if (lock->fl_start < 0)
5404 lock->fl_start = OFFSET_MAX;
5405 if (lock->fl_end < 0)
5406 lock->fl_end = OFFSET_MAX;
5409 static fl_owner_t
5410 nfsd4_fl_get_owner(fl_owner_t owner)
5412 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5414 nfs4_get_stateowner(&lo->lo_owner);
5415 return owner;
5418 static void
5419 nfsd4_fl_put_owner(fl_owner_t owner)
5421 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
5423 if (lo)
5424 nfs4_put_stateowner(&lo->lo_owner);
5427 static void
5428 nfsd4_lm_notify(struct file_lock *fl)
5430 struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
5431 struct net *net = lo->lo_owner.so_client->net;
5432 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5433 struct nfsd4_blocked_lock *nbl = container_of(fl,
5434 struct nfsd4_blocked_lock, nbl_lock);
5435 bool queue = false;
5437 /* An empty list means that something else is going to be using it */
5438 spin_lock(&nn->blocked_locks_lock);
5439 if (!list_empty(&nbl->nbl_list)) {
5440 list_del_init(&nbl->nbl_list);
5441 list_del_init(&nbl->nbl_lru);
5442 queue = true;
5444 spin_unlock(&nn->blocked_locks_lock);
5446 if (queue)
5447 nfsd4_run_cb(&nbl->nbl_cb);
5450 static const struct lock_manager_operations nfsd_posix_mng_ops = {
5451 .lm_notify = nfsd4_lm_notify,
5452 .lm_get_owner = nfsd4_fl_get_owner,
5453 .lm_put_owner = nfsd4_fl_put_owner,
5456 static inline void
5457 nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
5459 struct nfs4_lockowner *lo;
5461 if (fl->fl_lmops == &nfsd_posix_mng_ops) {
5462 lo = (struct nfs4_lockowner *) fl->fl_owner;
5463 deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
5464 lo->lo_owner.so_owner.len, GFP_KERNEL);
5465 if (!deny->ld_owner.data)
5466 /* We just don't care that much */
5467 goto nevermind;
5468 deny->ld_owner.len = lo->lo_owner.so_owner.len;
5469 deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
5470 } else {
5471 nevermind:
5472 deny->ld_owner.len = 0;
5473 deny->ld_owner.data = NULL;
5474 deny->ld_clientid.cl_boot = 0;
5475 deny->ld_clientid.cl_id = 0;
5477 deny->ld_start = fl->fl_start;
5478 deny->ld_length = NFS4_MAX_UINT64;
5479 if (fl->fl_end != NFS4_MAX_UINT64)
5480 deny->ld_length = fl->fl_end - fl->fl_start + 1;
5481 deny->ld_type = NFS4_READ_LT;
5482 if (fl->fl_type != F_RDLCK)
5483 deny->ld_type = NFS4_WRITE_LT;
5486 static struct nfs4_lockowner *
5487 find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
5489 unsigned int strhashval = ownerstr_hashval(owner);
5490 struct nfs4_stateowner *so;
5492 lockdep_assert_held(&clp->cl_lock);
5494 list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
5495 so_strhash) {
5496 if (so->so_is_open_owner)
5497 continue;
5498 if (same_owner_str(so, owner))
5499 return lockowner(nfs4_get_stateowner(so));
5501 return NULL;
5504 static struct nfs4_lockowner *
5505 find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
5507 struct nfs4_lockowner *lo;
5509 spin_lock(&clp->cl_lock);
5510 lo = find_lockowner_str_locked(clp, owner);
5511 spin_unlock(&clp->cl_lock);
5512 return lo;
5515 static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
5517 unhash_lockowner_locked(lockowner(sop));
5520 static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
5522 struct nfs4_lockowner *lo = lockowner(sop);
5524 kmem_cache_free(lockowner_slab, lo);
5527 static const struct nfs4_stateowner_operations lockowner_ops = {
5528 .so_unhash = nfs4_unhash_lockowner,
5529 .so_free = nfs4_free_lockowner,
5533 * Alloc a lock owner structure.
5534 * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
5535 * occurred.
5537 * strhashval = ownerstr_hashval
5539 static struct nfs4_lockowner *
5540 alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
5541 struct nfs4_ol_stateid *open_stp,
5542 struct nfsd4_lock *lock)
5544 struct nfs4_lockowner *lo, *ret;
5546 lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
5547 if (!lo)
5548 return NULL;
5549 INIT_LIST_HEAD(&lo->lo_blocked);
5550 INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
5551 lo->lo_owner.so_is_open_owner = 0;
5552 lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
5553 lo->lo_owner.so_ops = &lockowner_ops;
5554 spin_lock(&clp->cl_lock);
5555 ret = find_lockowner_str_locked(clp, &lock->lk_new_owner);
5556 if (ret == NULL) {
5557 list_add(&lo->lo_owner.so_strhash,
5558 &clp->cl_ownerstr_hashtbl[strhashval]);
5559 ret = lo;
5560 } else
5561 nfs4_free_stateowner(&lo->lo_owner);
5563 spin_unlock(&clp->cl_lock);
5564 return ret;
5567 static void
5568 init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
5569 struct nfs4_file *fp, struct inode *inode,
5570 struct nfs4_ol_stateid *open_stp)
5572 struct nfs4_client *clp = lo->lo_owner.so_client;
5574 lockdep_assert_held(&clp->cl_lock);
5576 atomic_inc(&stp->st_stid.sc_count);
5577 stp->st_stid.sc_type = NFS4_LOCK_STID;
5578 stp->st_stateowner = nfs4_get_stateowner(&lo->lo_owner);
5579 get_nfs4_file(fp);
5580 stp->st_stid.sc_file = fp;
5581 stp->st_access_bmap = 0;
5582 stp->st_deny_bmap = open_stp->st_deny_bmap;
5583 stp->st_openstp = open_stp;
5584 mutex_init(&stp->st_mutex);
5585 list_add(&stp->st_locks, &open_stp->st_locks);
5586 list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
5587 spin_lock(&fp->fi_lock);
5588 list_add(&stp->st_perfile, &fp->fi_stateids);
5589 spin_unlock(&fp->fi_lock);
5592 static struct nfs4_ol_stateid *
5593 find_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp)
5595 struct nfs4_ol_stateid *lst;
5596 struct nfs4_client *clp = lo->lo_owner.so_client;
5598 lockdep_assert_held(&clp->cl_lock);
5600 list_for_each_entry(lst, &lo->lo_owner.so_stateids, st_perstateowner) {
5601 if (lst->st_stid.sc_file == fp) {
5602 atomic_inc(&lst->st_stid.sc_count);
5603 return lst;
5606 return NULL;
5609 static struct nfs4_ol_stateid *
5610 find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
5611 struct inode *inode, struct nfs4_ol_stateid *ost,
5612 bool *new)
5614 struct nfs4_stid *ns = NULL;
5615 struct nfs4_ol_stateid *lst;
5616 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5617 struct nfs4_client *clp = oo->oo_owner.so_client;
5619 spin_lock(&clp->cl_lock);
5620 lst = find_lock_stateid(lo, fi);
5621 if (lst == NULL) {
5622 spin_unlock(&clp->cl_lock);
5623 ns = nfs4_alloc_stid(clp, stateid_slab, nfs4_free_lock_stateid);
5624 if (ns == NULL)
5625 return NULL;
5627 spin_lock(&clp->cl_lock);
5628 lst = find_lock_stateid(lo, fi);
5629 if (likely(!lst)) {
5630 lst = openlockstateid(ns);
5631 init_lock_stateid(lst, lo, fi, inode, ost);
5632 ns = NULL;
5633 *new = true;
5636 spin_unlock(&clp->cl_lock);
5637 if (ns)
5638 nfs4_put_stid(ns);
5639 return lst;
5642 static int
5643 check_lock_length(u64 offset, u64 length)
5645 return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
5646 (length > ~offset)));
5649 static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
5651 struct nfs4_file *fp = lock_stp->st_stid.sc_file;
5653 lockdep_assert_held(&fp->fi_lock);
5655 if (test_access(access, lock_stp))
5656 return;
5657 __nfs4_file_get_access(fp, access);
5658 set_access(access, lock_stp);
5661 static __be32
5662 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
5663 struct nfs4_ol_stateid *ost,
5664 struct nfsd4_lock *lock,
5665 struct nfs4_ol_stateid **plst, bool *new)
5667 __be32 status;
5668 struct nfs4_file *fi = ost->st_stid.sc_file;
5669 struct nfs4_openowner *oo = openowner(ost->st_stateowner);
5670 struct nfs4_client *cl = oo->oo_owner.so_client;
5671 struct inode *inode = d_inode(cstate->current_fh.fh_dentry);
5672 struct nfs4_lockowner *lo;
5673 struct nfs4_ol_stateid *lst;
5674 unsigned int strhashval;
5675 bool hashed;
5677 lo = find_lockowner_str(cl, &lock->lk_new_owner);
5678 if (!lo) {
5679 strhashval = ownerstr_hashval(&lock->lk_new_owner);
5680 lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
5681 if (lo == NULL)
5682 return nfserr_jukebox;
5683 } else {
5684 /* with an existing lockowner, seqids must be the same */
5685 status = nfserr_bad_seqid;
5686 if (!cstate->minorversion &&
5687 lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
5688 goto out;
5691 retry:
5692 lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
5693 if (lst == NULL) {
5694 status = nfserr_jukebox;
5695 goto out;
5698 mutex_lock(&lst->st_mutex);
5700 /* See if it's still hashed to avoid race with FREE_STATEID */
5701 spin_lock(&cl->cl_lock);
5702 hashed = !list_empty(&lst->st_perfile);
5703 spin_unlock(&cl->cl_lock);
5705 if (!hashed) {
5706 mutex_unlock(&lst->st_mutex);
5707 nfs4_put_stid(&lst->st_stid);
5708 goto retry;
5710 status = nfs_ok;
5711 *plst = lst;
5712 out:
5713 nfs4_put_stateowner(&lo->lo_owner);
5714 return status;
5718 * LOCK operation
5720 __be32
5721 nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5722 struct nfsd4_lock *lock)
5724 struct nfs4_openowner *open_sop = NULL;
5725 struct nfs4_lockowner *lock_sop = NULL;
5726 struct nfs4_ol_stateid *lock_stp = NULL;
5727 struct nfs4_ol_stateid *open_stp = NULL;
5728 struct nfs4_file *fp;
5729 struct file *filp = NULL;
5730 struct nfsd4_blocked_lock *nbl = NULL;
5731 struct file_lock *file_lock = NULL;
5732 struct file_lock *conflock = NULL;
5733 __be32 status = 0;
5734 int lkflg;
5735 int err;
5736 bool new = false;
5737 unsigned char fl_type;
5738 unsigned int fl_flags = FL_POSIX;
5739 struct net *net = SVC_NET(rqstp);
5740 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
5742 dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
5743 (long long) lock->lk_offset,
5744 (long long) lock->lk_length);
5746 if (check_lock_length(lock->lk_offset, lock->lk_length))
5747 return nfserr_inval;
5749 if ((status = fh_verify(rqstp, &cstate->current_fh,
5750 S_IFREG, NFSD_MAY_LOCK))) {
5751 dprintk("NFSD: nfsd4_lock: permission denied!\n");
5752 return status;
5755 if (lock->lk_is_new) {
5756 if (nfsd4_has_session(cstate))
5757 /* See rfc 5661 18.10.3: given clientid is ignored: */
5758 memcpy(&lock->lk_new_clientid,
5759 &cstate->session->se_client->cl_clientid,
5760 sizeof(clientid_t));
5762 status = nfserr_stale_clientid;
5763 if (STALE_CLIENTID(&lock->lk_new_clientid, nn))
5764 goto out;
5766 /* validate and update open stateid and open seqid */
5767 status = nfs4_preprocess_confirmed_seqid_op(cstate,
5768 lock->lk_new_open_seqid,
5769 &lock->lk_new_open_stateid,
5770 &open_stp, nn);
5771 if (status)
5772 goto out;
5773 mutex_unlock(&open_stp->st_mutex);
5774 open_sop = openowner(open_stp->st_stateowner);
5775 status = nfserr_bad_stateid;
5776 if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
5777 &lock->lk_new_clientid))
5778 goto out;
5779 status = lookup_or_create_lock_state(cstate, open_stp, lock,
5780 &lock_stp, &new);
5781 } else {
5782 status = nfs4_preprocess_seqid_op(cstate,
5783 lock->lk_old_lock_seqid,
5784 &lock->lk_old_lock_stateid,
5785 NFS4_LOCK_STID, &lock_stp, nn);
5787 if (status)
5788 goto out;
5789 lock_sop = lockowner(lock_stp->st_stateowner);
5791 lkflg = setlkflg(lock->lk_type);
5792 status = nfs4_check_openmode(lock_stp, lkflg);
5793 if (status)
5794 goto out;
5796 status = nfserr_grace;
5797 if (locks_in_grace(net) && !lock->lk_reclaim)
5798 goto out;
5799 status = nfserr_no_grace;
5800 if (!locks_in_grace(net) && lock->lk_reclaim)
5801 goto out;
5803 fp = lock_stp->st_stid.sc_file;
5804 switch (lock->lk_type) {
5805 case NFS4_READW_LT:
5806 if (nfsd4_has_session(cstate))
5807 fl_flags |= FL_SLEEP;
5808 /* Fallthrough */
5809 case NFS4_READ_LT:
5810 spin_lock(&fp->fi_lock);
5811 filp = find_readable_file_locked(fp);
5812 if (filp)
5813 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
5814 spin_unlock(&fp->fi_lock);
5815 fl_type = F_RDLCK;
5816 break;
5817 case NFS4_WRITEW_LT:
5818 if (nfsd4_has_session(cstate))
5819 fl_flags |= FL_SLEEP;
5820 /* Fallthrough */
5821 case NFS4_WRITE_LT:
5822 spin_lock(&fp->fi_lock);
5823 filp = find_writeable_file_locked(fp);
5824 if (filp)
5825 get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
5826 spin_unlock(&fp->fi_lock);
5827 fl_type = F_WRLCK;
5828 break;
5829 default:
5830 status = nfserr_inval;
5831 goto out;
5834 if (!filp) {
5835 status = nfserr_openmode;
5836 goto out;
5839 nbl = find_or_allocate_block(lock_sop, &fp->fi_fhandle, nn);
5840 if (!nbl) {
5841 dprintk("NFSD: %s: unable to allocate block!\n", __func__);
5842 status = nfserr_jukebox;
5843 goto out;
5846 file_lock = &nbl->nbl_lock;
5847 file_lock->fl_type = fl_type;
5848 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(&lock_sop->lo_owner));
5849 file_lock->fl_pid = current->tgid;
5850 file_lock->fl_file = filp;
5851 file_lock->fl_flags = fl_flags;
5852 file_lock->fl_lmops = &nfsd_posix_mng_ops;
5853 file_lock->fl_start = lock->lk_offset;
5854 file_lock->fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
5855 nfs4_transform_lock_offset(file_lock);
5857 conflock = locks_alloc_lock();
5858 if (!conflock) {
5859 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5860 status = nfserr_jukebox;
5861 goto out;
5864 if (fl_flags & FL_SLEEP) {
5865 nbl->nbl_time = jiffies;
5866 spin_lock(&nn->blocked_locks_lock);
5867 list_add_tail(&nbl->nbl_list, &lock_sop->lo_blocked);
5868 list_add_tail(&nbl->nbl_lru, &nn->blocked_locks_lru);
5869 spin_unlock(&nn->blocked_locks_lock);
5872 err = vfs_lock_file(filp, F_SETLK, file_lock, conflock);
5873 switch (err) {
5874 case 0: /* success! */
5875 nfs4_inc_and_copy_stateid(&lock->lk_resp_stateid, &lock_stp->st_stid);
5876 status = 0;
5877 break;
5878 case FILE_LOCK_DEFERRED:
5879 nbl = NULL;
5880 /* Fallthrough */
5881 case -EAGAIN: /* conflock holds conflicting lock */
5882 status = nfserr_denied;
5883 dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
5884 nfs4_set_lock_denied(conflock, &lock->lk_denied);
5885 break;
5886 case -EDEADLK:
5887 status = nfserr_deadlock;
5888 break;
5889 default:
5890 dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
5891 status = nfserrno(err);
5892 break;
5894 out:
5895 if (nbl) {
5896 /* dequeue it if we queued it before */
5897 if (fl_flags & FL_SLEEP) {
5898 spin_lock(&nn->blocked_locks_lock);
5899 list_del_init(&nbl->nbl_list);
5900 list_del_init(&nbl->nbl_lru);
5901 spin_unlock(&nn->blocked_locks_lock);
5903 free_blocked_lock(nbl);
5905 if (filp)
5906 fput(filp);
5907 if (lock_stp) {
5908 /* Bump seqid manually if the 4.0 replay owner is openowner */
5909 if (cstate->replay_owner &&
5910 cstate->replay_owner != &lock_sop->lo_owner &&
5911 seqid_mutating_err(ntohl(status)))
5912 lock_sop->lo_owner.so_seqid++;
5914 mutex_unlock(&lock_stp->st_mutex);
5917 * If this is a new, never-before-used stateid, and we are
5918 * returning an error, then just go ahead and release it.
5920 if (status && new)
5921 release_lock_stateid(lock_stp);
5923 nfs4_put_stid(&lock_stp->st_stid);
5925 if (open_stp)
5926 nfs4_put_stid(&open_stp->st_stid);
5927 nfsd4_bump_seqid(cstate, status);
5928 if (conflock)
5929 locks_free_lock(conflock);
5930 return status;
5934 * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
5935 * so we do a temporary open here just to get an open file to pass to
5936 * vfs_test_lock. (Arguably perhaps test_lock should be done with an
5937 * inode operation.)
5939 static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
5941 struct file *file;
5942 __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
5943 if (!err) {
5944 err = nfserrno(vfs_test_lock(file, lock));
5945 fput(file);
5947 return err;
5951 * LOCKT operation
5953 __be32
5954 nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5955 struct nfsd4_lockt *lockt)
5957 struct file_lock *file_lock = NULL;
5958 struct nfs4_lockowner *lo = NULL;
5959 __be32 status;
5960 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
5962 if (locks_in_grace(SVC_NET(rqstp)))
5963 return nfserr_grace;
5965 if (check_lock_length(lockt->lt_offset, lockt->lt_length))
5966 return nfserr_inval;
5968 if (!nfsd4_has_session(cstate)) {
5969 status = lookup_clientid(&lockt->lt_clientid, cstate, nn);
5970 if (status)
5971 goto out;
5974 if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
5975 goto out;
5977 file_lock = locks_alloc_lock();
5978 if (!file_lock) {
5979 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
5980 status = nfserr_jukebox;
5981 goto out;
5984 switch (lockt->lt_type) {
5985 case NFS4_READ_LT:
5986 case NFS4_READW_LT:
5987 file_lock->fl_type = F_RDLCK;
5988 break;
5989 case NFS4_WRITE_LT:
5990 case NFS4_WRITEW_LT:
5991 file_lock->fl_type = F_WRLCK;
5992 break;
5993 default:
5994 dprintk("NFSD: nfs4_lockt: bad lock type!\n");
5995 status = nfserr_inval;
5996 goto out;
5999 lo = find_lockowner_str(cstate->clp, &lockt->lt_owner);
6000 if (lo)
6001 file_lock->fl_owner = (fl_owner_t)lo;
6002 file_lock->fl_pid = current->tgid;
6003 file_lock->fl_flags = FL_POSIX;
6005 file_lock->fl_start = lockt->lt_offset;
6006 file_lock->fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
6008 nfs4_transform_lock_offset(file_lock);
6010 status = nfsd_test_lock(rqstp, &cstate->current_fh, file_lock);
6011 if (status)
6012 goto out;
6014 if (file_lock->fl_type != F_UNLCK) {
6015 status = nfserr_denied;
6016 nfs4_set_lock_denied(file_lock, &lockt->lt_denied);
6018 out:
6019 if (lo)
6020 nfs4_put_stateowner(&lo->lo_owner);
6021 if (file_lock)
6022 locks_free_lock(file_lock);
6023 return status;
6026 __be32
6027 nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6028 struct nfsd4_locku *locku)
6030 struct nfs4_ol_stateid *stp;
6031 struct file *filp = NULL;
6032 struct file_lock *file_lock = NULL;
6033 __be32 status;
6034 int err;
6035 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6037 dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
6038 (long long) locku->lu_offset,
6039 (long long) locku->lu_length);
6041 if (check_lock_length(locku->lu_offset, locku->lu_length))
6042 return nfserr_inval;
6044 status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
6045 &locku->lu_stateid, NFS4_LOCK_STID,
6046 &stp, nn);
6047 if (status)
6048 goto out;
6049 filp = find_any_file(stp->st_stid.sc_file);
6050 if (!filp) {
6051 status = nfserr_lock_range;
6052 goto put_stateid;
6054 file_lock = locks_alloc_lock();
6055 if (!file_lock) {
6056 dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
6057 status = nfserr_jukebox;
6058 goto fput;
6061 file_lock->fl_type = F_UNLCK;
6062 file_lock->fl_owner = (fl_owner_t)lockowner(nfs4_get_stateowner(stp->st_stateowner));
6063 file_lock->fl_pid = current->tgid;
6064 file_lock->fl_file = filp;
6065 file_lock->fl_flags = FL_POSIX;
6066 file_lock->fl_lmops = &nfsd_posix_mng_ops;
6067 file_lock->fl_start = locku->lu_offset;
6069 file_lock->fl_end = last_byte_offset(locku->lu_offset,
6070 locku->lu_length);
6071 nfs4_transform_lock_offset(file_lock);
6073 err = vfs_lock_file(filp, F_SETLK, file_lock, NULL);
6074 if (err) {
6075 dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
6076 goto out_nfserr;
6078 nfs4_inc_and_copy_stateid(&locku->lu_stateid, &stp->st_stid);
6079 fput:
6080 fput(filp);
6081 put_stateid:
6082 mutex_unlock(&stp->st_mutex);
6083 nfs4_put_stid(&stp->st_stid);
6084 out:
6085 nfsd4_bump_seqid(cstate, status);
6086 if (file_lock)
6087 locks_free_lock(file_lock);
6088 return status;
6090 out_nfserr:
6091 status = nfserrno(err);
6092 goto fput;
6096 * returns
6097 * true: locks held by lockowner
6098 * false: no locks held by lockowner
6100 static bool
6101 check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
6103 struct file_lock *fl;
6104 int status = false;
6105 struct file *filp = find_any_file(fp);
6106 struct inode *inode;
6107 struct file_lock_context *flctx;
6109 if (!filp) {
6110 /* Any valid lock stateid should have some sort of access */
6111 WARN_ON_ONCE(1);
6112 return status;
6115 inode = file_inode(filp);
6116 flctx = inode->i_flctx;
6118 if (flctx && !list_empty_careful(&flctx->flc_posix)) {
6119 spin_lock(&flctx->flc_lock);
6120 list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
6121 if (fl->fl_owner == (fl_owner_t)lowner) {
6122 status = true;
6123 break;
6126 spin_unlock(&flctx->flc_lock);
6128 fput(filp);
6129 return status;
6132 __be32
6133 nfsd4_release_lockowner(struct svc_rqst *rqstp,
6134 struct nfsd4_compound_state *cstate,
6135 struct nfsd4_release_lockowner *rlockowner)
6137 clientid_t *clid = &rlockowner->rl_clientid;
6138 struct nfs4_stateowner *sop;
6139 struct nfs4_lockowner *lo = NULL;
6140 struct nfs4_ol_stateid *stp;
6141 struct xdr_netobj *owner = &rlockowner->rl_owner;
6142 unsigned int hashval = ownerstr_hashval(owner);
6143 __be32 status;
6144 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
6145 struct nfs4_client *clp;
6146 LIST_HEAD (reaplist);
6148 dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
6149 clid->cl_boot, clid->cl_id);
6151 status = lookup_clientid(clid, cstate, nn);
6152 if (status)
6153 return status;
6155 clp = cstate->clp;
6156 /* Find the matching lock stateowner */
6157 spin_lock(&clp->cl_lock);
6158 list_for_each_entry(sop, &clp->cl_ownerstr_hashtbl[hashval],
6159 so_strhash) {
6161 if (sop->so_is_open_owner || !same_owner_str(sop, owner))
6162 continue;
6164 /* see if there are still any locks associated with it */
6165 lo = lockowner(sop);
6166 list_for_each_entry(stp, &sop->so_stateids, st_perstateowner) {
6167 if (check_for_locks(stp->st_stid.sc_file, lo)) {
6168 status = nfserr_locks_held;
6169 spin_unlock(&clp->cl_lock);
6170 return status;
6174 nfs4_get_stateowner(sop);
6175 break;
6177 if (!lo) {
6178 spin_unlock(&clp->cl_lock);
6179 return status;
6182 unhash_lockowner_locked(lo);
6183 while (!list_empty(&lo->lo_owner.so_stateids)) {
6184 stp = list_first_entry(&lo->lo_owner.so_stateids,
6185 struct nfs4_ol_stateid,
6186 st_perstateowner);
6187 WARN_ON(!unhash_lock_stateid(stp));
6188 put_ol_stateid_locked(stp, &reaplist);
6190 spin_unlock(&clp->cl_lock);
6191 free_ol_stateid_reaplist(&reaplist);
6192 nfs4_put_stateowner(&lo->lo_owner);
6194 return status;
6197 static inline struct nfs4_client_reclaim *
6198 alloc_reclaim(void)
6200 return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
6203 bool
6204 nfs4_has_reclaimed_state(const char *name, struct nfsd_net *nn)
6206 struct nfs4_client_reclaim *crp;
6208 crp = nfsd4_find_reclaim_client(name, nn);
6209 return (crp && crp->cr_clp);
6213 * failure => all reset bets are off, nfserr_no_grace...
6215 struct nfs4_client_reclaim *
6216 nfs4_client_to_reclaim(const char *name, struct nfsd_net *nn)
6218 unsigned int strhashval;
6219 struct nfs4_client_reclaim *crp;
6221 dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
6222 crp = alloc_reclaim();
6223 if (crp) {
6224 strhashval = clientstr_hashval(name);
6225 INIT_LIST_HEAD(&crp->cr_strhash);
6226 list_add(&crp->cr_strhash, &nn->reclaim_str_hashtbl[strhashval]);
6227 memcpy(crp->cr_recdir, name, HEXDIR_LEN);
6228 crp->cr_clp = NULL;
6229 nn->reclaim_str_hashtbl_size++;
6231 return crp;
6234 void
6235 nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
6237 list_del(&crp->cr_strhash);
6238 kfree(crp);
6239 nn->reclaim_str_hashtbl_size--;
6242 void
6243 nfs4_release_reclaim(struct nfsd_net *nn)
6245 struct nfs4_client_reclaim *crp = NULL;
6246 int i;
6248 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6249 while (!list_empty(&nn->reclaim_str_hashtbl[i])) {
6250 crp = list_entry(nn->reclaim_str_hashtbl[i].next,
6251 struct nfs4_client_reclaim, cr_strhash);
6252 nfs4_remove_reclaim_record(crp, nn);
6255 WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
6259 * called from OPEN, CLAIM_PREVIOUS with a new clientid. */
6260 struct nfs4_client_reclaim *
6261 nfsd4_find_reclaim_client(const char *recdir, struct nfsd_net *nn)
6263 unsigned int strhashval;
6264 struct nfs4_client_reclaim *crp = NULL;
6266 dprintk("NFSD: nfs4_find_reclaim_client for recdir %s\n", recdir);
6268 strhashval = clientstr_hashval(recdir);
6269 list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
6270 if (same_name(crp->cr_recdir, recdir)) {
6271 return crp;
6274 return NULL;
6278 * Called from OPEN. Look for clientid in reclaim list.
6280 __be32
6281 nfs4_check_open_reclaim(clientid_t *clid,
6282 struct nfsd4_compound_state *cstate,
6283 struct nfsd_net *nn)
6285 __be32 status;
6287 /* find clientid in conf_id_hashtbl */
6288 status = lookup_clientid(clid, cstate, nn);
6289 if (status)
6290 return nfserr_reclaim_bad;
6292 if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &cstate->clp->cl_flags))
6293 return nfserr_no_grace;
6295 if (nfsd4_client_record_check(cstate->clp))
6296 return nfserr_reclaim_bad;
6298 return nfs_ok;
6301 #ifdef CONFIG_NFSD_FAULT_INJECTION
6302 static inline void
6303 put_client(struct nfs4_client *clp)
6305 atomic_dec(&clp->cl_refcount);
6308 static struct nfs4_client *
6309 nfsd_find_client(struct sockaddr_storage *addr, size_t addr_size)
6311 struct nfs4_client *clp;
6312 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6313 nfsd_net_id);
6315 if (!nfsd_netns_ready(nn))
6316 return NULL;
6318 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6319 if (memcmp(&clp->cl_addr, addr, addr_size) == 0)
6320 return clp;
6322 return NULL;
6326 nfsd_inject_print_clients(void)
6328 struct nfs4_client *clp;
6329 u64 count = 0;
6330 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6331 nfsd_net_id);
6332 char buf[INET6_ADDRSTRLEN];
6334 if (!nfsd_netns_ready(nn))
6335 return 0;
6337 spin_lock(&nn->client_lock);
6338 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6339 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6340 pr_info("NFS Client: %s\n", buf);
6341 ++count;
6343 spin_unlock(&nn->client_lock);
6345 return count;
6349 nfsd_inject_forget_client(struct sockaddr_storage *addr, size_t addr_size)
6351 u64 count = 0;
6352 struct nfs4_client *clp;
6353 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6354 nfsd_net_id);
6356 if (!nfsd_netns_ready(nn))
6357 return count;
6359 spin_lock(&nn->client_lock);
6360 clp = nfsd_find_client(addr, addr_size);
6361 if (clp) {
6362 if (mark_client_expired_locked(clp) == nfs_ok)
6363 ++count;
6364 else
6365 clp = NULL;
6367 spin_unlock(&nn->client_lock);
6369 if (clp)
6370 expire_client(clp);
6372 return count;
6376 nfsd_inject_forget_clients(u64 max)
6378 u64 count = 0;
6379 struct nfs4_client *clp, *next;
6380 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6381 nfsd_net_id);
6382 LIST_HEAD(reaplist);
6384 if (!nfsd_netns_ready(nn))
6385 return count;
6387 spin_lock(&nn->client_lock);
6388 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6389 if (mark_client_expired_locked(clp) == nfs_ok) {
6390 list_add(&clp->cl_lru, &reaplist);
6391 if (max != 0 && ++count >= max)
6392 break;
6395 spin_unlock(&nn->client_lock);
6397 list_for_each_entry_safe(clp, next, &reaplist, cl_lru)
6398 expire_client(clp);
6400 return count;
6403 static void nfsd_print_count(struct nfs4_client *clp, unsigned int count,
6404 const char *type)
6406 char buf[INET6_ADDRSTRLEN];
6407 rpc_ntop((struct sockaddr *)&clp->cl_addr, buf, sizeof(buf));
6408 printk(KERN_INFO "NFS Client: %s has %u %s\n", buf, count, type);
6411 static void
6412 nfsd_inject_add_lock_to_list(struct nfs4_ol_stateid *lst,
6413 struct list_head *collect)
6415 struct nfs4_client *clp = lst->st_stid.sc_client;
6416 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6417 nfsd_net_id);
6419 if (!collect)
6420 return;
6422 lockdep_assert_held(&nn->client_lock);
6423 atomic_inc(&clp->cl_refcount);
6424 list_add(&lst->st_locks, collect);
6427 static u64 nfsd_foreach_client_lock(struct nfs4_client *clp, u64 max,
6428 struct list_head *collect,
6429 bool (*func)(struct nfs4_ol_stateid *))
6431 struct nfs4_openowner *oop;
6432 struct nfs4_ol_stateid *stp, *st_next;
6433 struct nfs4_ol_stateid *lst, *lst_next;
6434 u64 count = 0;
6436 spin_lock(&clp->cl_lock);
6437 list_for_each_entry(oop, &clp->cl_openowners, oo_perclient) {
6438 list_for_each_entry_safe(stp, st_next,
6439 &oop->oo_owner.so_stateids, st_perstateowner) {
6440 list_for_each_entry_safe(lst, lst_next,
6441 &stp->st_locks, st_locks) {
6442 if (func) {
6443 if (func(lst))
6444 nfsd_inject_add_lock_to_list(lst,
6445 collect);
6447 ++count;
6449 * Despite the fact that these functions deal
6450 * with 64-bit integers for "count", we must
6451 * ensure that it doesn't blow up the
6452 * clp->cl_refcount. Throw a warning if we
6453 * start to approach INT_MAX here.
6455 WARN_ON_ONCE(count == (INT_MAX / 2));
6456 if (count == max)
6457 goto out;
6461 out:
6462 spin_unlock(&clp->cl_lock);
6464 return count;
6467 static u64
6468 nfsd_collect_client_locks(struct nfs4_client *clp, struct list_head *collect,
6469 u64 max)
6471 return nfsd_foreach_client_lock(clp, max, collect, unhash_lock_stateid);
6474 static u64
6475 nfsd_print_client_locks(struct nfs4_client *clp)
6477 u64 count = nfsd_foreach_client_lock(clp, 0, NULL, NULL);
6478 nfsd_print_count(clp, count, "locked files");
6479 return count;
6483 nfsd_inject_print_locks(void)
6485 struct nfs4_client *clp;
6486 u64 count = 0;
6487 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6488 nfsd_net_id);
6490 if (!nfsd_netns_ready(nn))
6491 return 0;
6493 spin_lock(&nn->client_lock);
6494 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6495 count += nfsd_print_client_locks(clp);
6496 spin_unlock(&nn->client_lock);
6498 return count;
6501 static void
6502 nfsd_reap_locks(struct list_head *reaplist)
6504 struct nfs4_client *clp;
6505 struct nfs4_ol_stateid *stp, *next;
6507 list_for_each_entry_safe(stp, next, reaplist, st_locks) {
6508 list_del_init(&stp->st_locks);
6509 clp = stp->st_stid.sc_client;
6510 nfs4_put_stid(&stp->st_stid);
6511 put_client(clp);
6516 nfsd_inject_forget_client_locks(struct sockaddr_storage *addr, size_t addr_size)
6518 unsigned int count = 0;
6519 struct nfs4_client *clp;
6520 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6521 nfsd_net_id);
6522 LIST_HEAD(reaplist);
6524 if (!nfsd_netns_ready(nn))
6525 return count;
6527 spin_lock(&nn->client_lock);
6528 clp = nfsd_find_client(addr, addr_size);
6529 if (clp)
6530 count = nfsd_collect_client_locks(clp, &reaplist, 0);
6531 spin_unlock(&nn->client_lock);
6532 nfsd_reap_locks(&reaplist);
6533 return count;
6537 nfsd_inject_forget_locks(u64 max)
6539 u64 count = 0;
6540 struct nfs4_client *clp;
6541 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6542 nfsd_net_id);
6543 LIST_HEAD(reaplist);
6545 if (!nfsd_netns_ready(nn))
6546 return count;
6548 spin_lock(&nn->client_lock);
6549 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6550 count += nfsd_collect_client_locks(clp, &reaplist, max - count);
6551 if (max != 0 && count >= max)
6552 break;
6554 spin_unlock(&nn->client_lock);
6555 nfsd_reap_locks(&reaplist);
6556 return count;
6559 static u64
6560 nfsd_foreach_client_openowner(struct nfs4_client *clp, u64 max,
6561 struct list_head *collect,
6562 void (*func)(struct nfs4_openowner *))
6564 struct nfs4_openowner *oop, *next;
6565 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6566 nfsd_net_id);
6567 u64 count = 0;
6569 lockdep_assert_held(&nn->client_lock);
6571 spin_lock(&clp->cl_lock);
6572 list_for_each_entry_safe(oop, next, &clp->cl_openowners, oo_perclient) {
6573 if (func) {
6574 func(oop);
6575 if (collect) {
6576 atomic_inc(&clp->cl_refcount);
6577 list_add(&oop->oo_perclient, collect);
6580 ++count;
6582 * Despite the fact that these functions deal with
6583 * 64-bit integers for "count", we must ensure that
6584 * it doesn't blow up the clp->cl_refcount. Throw a
6585 * warning if we start to approach INT_MAX here.
6587 WARN_ON_ONCE(count == (INT_MAX / 2));
6588 if (count == max)
6589 break;
6591 spin_unlock(&clp->cl_lock);
6593 return count;
6596 static u64
6597 nfsd_print_client_openowners(struct nfs4_client *clp)
6599 u64 count = nfsd_foreach_client_openowner(clp, 0, NULL, NULL);
6601 nfsd_print_count(clp, count, "openowners");
6602 return count;
6605 static u64
6606 nfsd_collect_client_openowners(struct nfs4_client *clp,
6607 struct list_head *collect, u64 max)
6609 return nfsd_foreach_client_openowner(clp, max, collect,
6610 unhash_openowner_locked);
6614 nfsd_inject_print_openowners(void)
6616 struct nfs4_client *clp;
6617 u64 count = 0;
6618 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6619 nfsd_net_id);
6621 if (!nfsd_netns_ready(nn))
6622 return 0;
6624 spin_lock(&nn->client_lock);
6625 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6626 count += nfsd_print_client_openowners(clp);
6627 spin_unlock(&nn->client_lock);
6629 return count;
6632 static void
6633 nfsd_reap_openowners(struct list_head *reaplist)
6635 struct nfs4_client *clp;
6636 struct nfs4_openowner *oop, *next;
6638 list_for_each_entry_safe(oop, next, reaplist, oo_perclient) {
6639 list_del_init(&oop->oo_perclient);
6640 clp = oop->oo_owner.so_client;
6641 release_openowner(oop);
6642 put_client(clp);
6647 nfsd_inject_forget_client_openowners(struct sockaddr_storage *addr,
6648 size_t addr_size)
6650 unsigned int count = 0;
6651 struct nfs4_client *clp;
6652 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6653 nfsd_net_id);
6654 LIST_HEAD(reaplist);
6656 if (!nfsd_netns_ready(nn))
6657 return count;
6659 spin_lock(&nn->client_lock);
6660 clp = nfsd_find_client(addr, addr_size);
6661 if (clp)
6662 count = nfsd_collect_client_openowners(clp, &reaplist, 0);
6663 spin_unlock(&nn->client_lock);
6664 nfsd_reap_openowners(&reaplist);
6665 return count;
6669 nfsd_inject_forget_openowners(u64 max)
6671 u64 count = 0;
6672 struct nfs4_client *clp;
6673 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6674 nfsd_net_id);
6675 LIST_HEAD(reaplist);
6677 if (!nfsd_netns_ready(nn))
6678 return count;
6680 spin_lock(&nn->client_lock);
6681 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6682 count += nfsd_collect_client_openowners(clp, &reaplist,
6683 max - count);
6684 if (max != 0 && count >= max)
6685 break;
6687 spin_unlock(&nn->client_lock);
6688 nfsd_reap_openowners(&reaplist);
6689 return count;
6692 static u64 nfsd_find_all_delegations(struct nfs4_client *clp, u64 max,
6693 struct list_head *victims)
6695 struct nfs4_delegation *dp, *next;
6696 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6697 nfsd_net_id);
6698 u64 count = 0;
6700 lockdep_assert_held(&nn->client_lock);
6702 spin_lock(&state_lock);
6703 list_for_each_entry_safe(dp, next, &clp->cl_delegations, dl_perclnt) {
6704 if (victims) {
6706 * It's not safe to mess with delegations that have a
6707 * non-zero dl_time. They might have already been broken
6708 * and could be processed by the laundromat outside of
6709 * the state_lock. Just leave them be.
6711 if (dp->dl_time != 0)
6712 continue;
6714 atomic_inc(&clp->cl_refcount);
6715 WARN_ON(!unhash_delegation_locked(dp));
6716 list_add(&dp->dl_recall_lru, victims);
6718 ++count;
6720 * Despite the fact that these functions deal with
6721 * 64-bit integers for "count", we must ensure that
6722 * it doesn't blow up the clp->cl_refcount. Throw a
6723 * warning if we start to approach INT_MAX here.
6725 WARN_ON_ONCE(count == (INT_MAX / 2));
6726 if (count == max)
6727 break;
6729 spin_unlock(&state_lock);
6730 return count;
6733 static u64
6734 nfsd_print_client_delegations(struct nfs4_client *clp)
6736 u64 count = nfsd_find_all_delegations(clp, 0, NULL);
6738 nfsd_print_count(clp, count, "delegations");
6739 return count;
6743 nfsd_inject_print_delegations(void)
6745 struct nfs4_client *clp;
6746 u64 count = 0;
6747 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6748 nfsd_net_id);
6750 if (!nfsd_netns_ready(nn))
6751 return 0;
6753 spin_lock(&nn->client_lock);
6754 list_for_each_entry(clp, &nn->client_lru, cl_lru)
6755 count += nfsd_print_client_delegations(clp);
6756 spin_unlock(&nn->client_lock);
6758 return count;
6761 static void
6762 nfsd_forget_delegations(struct list_head *reaplist)
6764 struct nfs4_client *clp;
6765 struct nfs4_delegation *dp, *next;
6767 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6768 list_del_init(&dp->dl_recall_lru);
6769 clp = dp->dl_stid.sc_client;
6770 revoke_delegation(dp);
6771 put_client(clp);
6776 nfsd_inject_forget_client_delegations(struct sockaddr_storage *addr,
6777 size_t addr_size)
6779 u64 count = 0;
6780 struct nfs4_client *clp;
6781 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6782 nfsd_net_id);
6783 LIST_HEAD(reaplist);
6785 if (!nfsd_netns_ready(nn))
6786 return count;
6788 spin_lock(&nn->client_lock);
6789 clp = nfsd_find_client(addr, addr_size);
6790 if (clp)
6791 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6792 spin_unlock(&nn->client_lock);
6794 nfsd_forget_delegations(&reaplist);
6795 return count;
6799 nfsd_inject_forget_delegations(u64 max)
6801 u64 count = 0;
6802 struct nfs4_client *clp;
6803 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6804 nfsd_net_id);
6805 LIST_HEAD(reaplist);
6807 if (!nfsd_netns_ready(nn))
6808 return count;
6810 spin_lock(&nn->client_lock);
6811 list_for_each_entry(clp, &nn->client_lru, cl_lru) {
6812 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6813 if (max != 0 && count >= max)
6814 break;
6816 spin_unlock(&nn->client_lock);
6817 nfsd_forget_delegations(&reaplist);
6818 return count;
6821 static void
6822 nfsd_recall_delegations(struct list_head *reaplist)
6824 struct nfs4_client *clp;
6825 struct nfs4_delegation *dp, *next;
6827 list_for_each_entry_safe(dp, next, reaplist, dl_recall_lru) {
6828 list_del_init(&dp->dl_recall_lru);
6829 clp = dp->dl_stid.sc_client;
6831 * We skipped all entries that had a zero dl_time before,
6832 * so we can now reset the dl_time back to 0. If a delegation
6833 * break comes in now, then it won't make any difference since
6834 * we're recalling it either way.
6836 spin_lock(&state_lock);
6837 dp->dl_time = 0;
6838 spin_unlock(&state_lock);
6839 nfsd_break_one_deleg(dp);
6840 put_client(clp);
6845 nfsd_inject_recall_client_delegations(struct sockaddr_storage *addr,
6846 size_t addr_size)
6848 u64 count = 0;
6849 struct nfs4_client *clp;
6850 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6851 nfsd_net_id);
6852 LIST_HEAD(reaplist);
6854 if (!nfsd_netns_ready(nn))
6855 return count;
6857 spin_lock(&nn->client_lock);
6858 clp = nfsd_find_client(addr, addr_size);
6859 if (clp)
6860 count = nfsd_find_all_delegations(clp, 0, &reaplist);
6861 spin_unlock(&nn->client_lock);
6863 nfsd_recall_delegations(&reaplist);
6864 return count;
6868 nfsd_inject_recall_delegations(u64 max)
6870 u64 count = 0;
6871 struct nfs4_client *clp, *next;
6872 struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
6873 nfsd_net_id);
6874 LIST_HEAD(reaplist);
6876 if (!nfsd_netns_ready(nn))
6877 return count;
6879 spin_lock(&nn->client_lock);
6880 list_for_each_entry_safe(clp, next, &nn->client_lru, cl_lru) {
6881 count += nfsd_find_all_delegations(clp, max - count, &reaplist);
6882 if (max != 0 && ++count >= max)
6883 break;
6885 spin_unlock(&nn->client_lock);
6886 nfsd_recall_delegations(&reaplist);
6887 return count;
6889 #endif /* CONFIG_NFSD_FAULT_INJECTION */
6892 * Since the lifetime of a delegation isn't limited to that of an open, a
6893 * client may quite reasonably hang on to a delegation as long as it has
6894 * the inode cached. This becomes an obvious problem the first time a
6895 * client's inode cache approaches the size of the server's total memory.
6897 * For now we avoid this problem by imposing a hard limit on the number
6898 * of delegations, which varies according to the server's memory size.
6900 static void
6901 set_max_delegations(void)
6904 * Allow at most 4 delegations per megabyte of RAM. Quick
6905 * estimates suggest that in the worst case (where every delegation
6906 * is for a different inode), a delegation could take about 1.5K,
6907 * giving a worst case usage of about 6% of memory.
6909 max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
6912 static int nfs4_state_create_net(struct net *net)
6914 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6915 int i;
6917 nn->conf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6918 CLIENT_HASH_SIZE, GFP_KERNEL);
6919 if (!nn->conf_id_hashtbl)
6920 goto err;
6921 nn->unconf_id_hashtbl = kmalloc(sizeof(struct list_head) *
6922 CLIENT_HASH_SIZE, GFP_KERNEL);
6923 if (!nn->unconf_id_hashtbl)
6924 goto err_unconf_id;
6925 nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
6926 SESSION_HASH_SIZE, GFP_KERNEL);
6927 if (!nn->sessionid_hashtbl)
6928 goto err_sessionid;
6930 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6931 INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
6932 INIT_LIST_HEAD(&nn->unconf_id_hashtbl[i]);
6934 for (i = 0; i < SESSION_HASH_SIZE; i++)
6935 INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
6936 nn->conf_name_tree = RB_ROOT;
6937 nn->unconf_name_tree = RB_ROOT;
6938 INIT_LIST_HEAD(&nn->client_lru);
6939 INIT_LIST_HEAD(&nn->close_lru);
6940 INIT_LIST_HEAD(&nn->del_recall_lru);
6941 spin_lock_init(&nn->client_lock);
6943 spin_lock_init(&nn->blocked_locks_lock);
6944 INIT_LIST_HEAD(&nn->blocked_locks_lru);
6946 INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
6947 get_net(net);
6949 return 0;
6951 err_sessionid:
6952 kfree(nn->unconf_id_hashtbl);
6953 err_unconf_id:
6954 kfree(nn->conf_id_hashtbl);
6955 err:
6956 return -ENOMEM;
6959 static void
6960 nfs4_state_destroy_net(struct net *net)
6962 int i;
6963 struct nfs4_client *clp = NULL;
6964 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6966 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6967 while (!list_empty(&nn->conf_id_hashtbl[i])) {
6968 clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6969 destroy_client(clp);
6973 for (i = 0; i < CLIENT_HASH_SIZE; i++) {
6974 while (!list_empty(&nn->unconf_id_hashtbl[i])) {
6975 clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
6976 destroy_client(clp);
6980 kfree(nn->sessionid_hashtbl);
6981 kfree(nn->unconf_id_hashtbl);
6982 kfree(nn->conf_id_hashtbl);
6983 put_net(net);
6987 nfs4_state_start_net(struct net *net)
6989 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
6990 int ret;
6992 ret = nfs4_state_create_net(net);
6993 if (ret)
6994 return ret;
6995 nn->boot_time = get_seconds();
6996 nn->grace_ended = false;
6997 nn->nfsd4_manager.block_opens = true;
6998 locks_start_grace(net, &nn->nfsd4_manager);
6999 nfsd4_client_tracking_init(net);
7000 printk(KERN_INFO "NFSD: starting %ld-second grace period (net %p)\n",
7001 nn->nfsd4_grace, net);
7002 queue_delayed_work(laundry_wq, &nn->laundromat_work, nn->nfsd4_grace * HZ);
7003 return 0;
7006 /* initialization to perform when the nfsd service is started: */
7009 nfs4_state_start(void)
7011 int ret;
7013 ret = set_callback_cred();
7014 if (ret)
7015 return ret;
7017 laundry_wq = alloc_workqueue("%s", WQ_UNBOUND, 0, "nfsd4");
7018 if (laundry_wq == NULL) {
7019 ret = -ENOMEM;
7020 goto out_cleanup_cred;
7022 ret = nfsd4_create_callback_queue();
7023 if (ret)
7024 goto out_free_laundry;
7026 set_max_delegations();
7027 return 0;
7029 out_free_laundry:
7030 destroy_workqueue(laundry_wq);
7031 out_cleanup_cred:
7032 cleanup_callback_cred();
7033 return ret;
7036 void
7037 nfs4_state_shutdown_net(struct net *net)
7039 struct nfs4_delegation *dp = NULL;
7040 struct list_head *pos, *next, reaplist;
7041 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
7042 struct nfsd4_blocked_lock *nbl;
7044 cancel_delayed_work_sync(&nn->laundromat_work);
7045 locks_end_grace(&nn->nfsd4_manager);
7047 INIT_LIST_HEAD(&reaplist);
7048 spin_lock(&state_lock);
7049 list_for_each_safe(pos, next, &nn->del_recall_lru) {
7050 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7051 WARN_ON(!unhash_delegation_locked(dp));
7052 list_add(&dp->dl_recall_lru, &reaplist);
7054 spin_unlock(&state_lock);
7055 list_for_each_safe(pos, next, &reaplist) {
7056 dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
7057 list_del_init(&dp->dl_recall_lru);
7058 put_clnt_odstate(dp->dl_clnt_odstate);
7059 nfs4_put_deleg_lease(dp->dl_stid.sc_file);
7060 nfs4_put_stid(&dp->dl_stid);
7063 BUG_ON(!list_empty(&reaplist));
7064 spin_lock(&nn->blocked_locks_lock);
7065 while (!list_empty(&nn->blocked_locks_lru)) {
7066 nbl = list_first_entry(&nn->blocked_locks_lru,
7067 struct nfsd4_blocked_lock, nbl_lru);
7068 list_move(&nbl->nbl_lru, &reaplist);
7069 list_del_init(&nbl->nbl_list);
7071 spin_unlock(&nn->blocked_locks_lock);
7073 while (!list_empty(&reaplist)) {
7074 nbl = list_first_entry(&nn->blocked_locks_lru,
7075 struct nfsd4_blocked_lock, nbl_lru);
7076 list_del_init(&nbl->nbl_lru);
7077 posix_unblock_lock(&nbl->nbl_lock);
7078 free_blocked_lock(nbl);
7081 nfsd4_client_tracking_exit(net);
7082 nfs4_state_destroy_net(net);
7085 void
7086 nfs4_state_shutdown(void)
7088 destroy_workqueue(laundry_wq);
7089 nfsd4_destroy_callback_queue();
7090 cleanup_callback_cred();
7093 static void
7094 get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7096 if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
7097 memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
7100 static void
7101 put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
7103 if (cstate->minorversion) {
7104 memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
7105 SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7109 void
7110 clear_current_stateid(struct nfsd4_compound_state *cstate)
7112 CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
7116 * functions to set current state id
7118 void
7119 nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
7121 put_stateid(cstate, &odp->od_stateid);
7124 void
7125 nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
7127 put_stateid(cstate, &open->op_stateid);
7130 void
7131 nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
7133 put_stateid(cstate, &close->cl_stateid);
7136 void
7137 nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
7139 put_stateid(cstate, &lock->lk_resp_stateid);
7143 * functions to consume current state id
7146 void
7147 nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
7149 get_stateid(cstate, &odp->od_stateid);
7152 void
7153 nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
7155 get_stateid(cstate, &drp->dr_stateid);
7158 void
7159 nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
7161 get_stateid(cstate, &fsp->fr_stateid);
7164 void
7165 nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
7167 get_stateid(cstate, &setattr->sa_stateid);
7170 void
7171 nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
7173 get_stateid(cstate, &close->cl_stateid);
7176 void
7177 nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
7179 get_stateid(cstate, &locku->lu_stateid);
7182 void
7183 nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
7185 get_stateid(cstate, &read->rd_stateid);
7188 void
7189 nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
7191 get_stateid(cstate, &write->wr_stateid);