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2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_types.h"
24 #include "xfs_trans.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_btree.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_quota.h"
40 #include "xfs_utils.h"
43 * Look up an inode by number in the given file system.
44 * The inode is looked up in the cache held in each AG.
45 * If the inode is found in the cache, attach it to the provided
48 * If it is not in core, read it in from the file system's device,
49 * add it to the cache and attach the provided vnode.
51 * The inode is locked according to the value of the lock_flags parameter.
52 * This flag parameter indicates how and if the inode's IO lock and inode lock
55 * mp -- the mount point structure for the current file system. It points
56 * to the inode hash table.
57 * tp -- a pointer to the current transaction if there is one. This is
58 * simply passed through to the xfs_iread() call.
59 * ino -- the number of the inode desired. This is the unique identifier
60 * within the file system for the inode being requested.
61 * lock_flags -- flags indicating how to lock the inode. See the comment
62 * for xfs_ilock() for a list of valid values.
63 * bno -- the block number starting the buffer containing the inode,
64 * if known (as by bulkstat), else 0.
79 bhv_vnode_t
*inode_vp
;
81 xfs_icluster_t
*icl
, *new_icl
= NULL
;
82 unsigned long first_index
, mask
;
86 /* the radix tree exists only in inode capable AGs */
87 if (XFS_INO_TO_AGNO(mp
, ino
) >= mp
->m_maxagi
)
90 /* get the perag structure and ensure that it's inode capable */
91 pag
= xfs_get_perag(mp
, ino
);
92 if (!pag
->pagi_inodeok
)
94 ASSERT(pag
->pag_ici_init
);
95 agino
= XFS_INO_TO_AGINO(mp
, ino
);
98 read_lock(&pag
->pag_ici_lock
);
99 ip
= radix_tree_lookup(&pag
->pag_ici_root
, agino
);
103 * If INEW is set this inode is being set up
104 * we need to pause and try again.
106 if (xfs_iflags_test(ip
, XFS_INEW
)) {
107 read_unlock(&pag
->pag_ici_lock
);
109 XFS_STATS_INC(xs_ig_frecycle
);
114 inode_vp
= XFS_ITOV_NULL(ip
);
115 if (inode_vp
== NULL
) {
117 * If IRECLAIM is set this inode is
118 * on its way out of the system,
119 * we need to pause and try again.
121 if (xfs_iflags_test(ip
, XFS_IRECLAIM
)) {
122 read_unlock(&pag
->pag_ici_lock
);
124 XFS_STATS_INC(xs_ig_frecycle
);
128 ASSERT(xfs_iflags_test(ip
, XFS_IRECLAIMABLE
));
131 * If lookup is racing with unlink, then we
132 * should return an error immediately so we
133 * don't remove it from the reclaim list and
134 * potentially leak the inode.
136 if ((ip
->i_d
.di_mode
== 0) &&
137 !(flags
& XFS_IGET_CREATE
)) {
138 read_unlock(&pag
->pag_ici_lock
);
139 xfs_put_perag(mp
, pag
);
144 * There may be transactions sitting in the
145 * incore log buffers or being flushed to disk
146 * at this time. We can't clear the
147 * XFS_IRECLAIMABLE flag until these
148 * transactions have hit the disk, otherwise we
149 * will void the guarantee the flag provides
152 if (xfs_ipincount(ip
)) {
153 read_unlock(&pag
->pag_ici_lock
);
155 XFS_LOG_FORCE
|XFS_LOG_SYNC
);
156 XFS_STATS_INC(xs_ig_frecycle
);
160 xfs_itrace_exit_tag(ip
, "xfs_iget.alloc");
162 XFS_STATS_INC(xs_ig_found
);
164 xfs_iflags_clear(ip
, XFS_IRECLAIMABLE
);
165 read_unlock(&pag
->pag_ici_lock
);
168 list_del_init(&ip
->i_reclaim
);
169 XFS_MOUNT_IUNLOCK(mp
);
173 } else if (vp
!= inode_vp
) {
174 struct inode
*inode
= vn_to_inode(inode_vp
);
176 /* The inode is being torn down, pause and
179 if (inode
->i_state
& (I_FREEING
| I_CLEAR
)) {
180 read_unlock(&pag
->pag_ici_lock
);
182 XFS_STATS_INC(xs_ig_frecycle
);
186 /* Chances are the other vnode (the one in the inode) is being torn
187 * down right now, and we landed on top of it. Question is, what do
188 * we do? Unhook the old inode and hook up the new one?
191 "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
198 read_unlock(&pag
->pag_ici_lock
);
199 XFS_STATS_INC(xs_ig_found
);
202 if (ip
->i_d
.di_mode
== 0) {
203 if (!(flags
& XFS_IGET_CREATE
)) {
204 xfs_put_perag(mp
, pag
);
207 xfs_iocore_inode_reinit(ip
);
211 xfs_ilock(ip
, lock_flags
);
213 xfs_iflags_clear(ip
, XFS_ISTALE
);
214 xfs_itrace_exit_tag(ip
, "xfs_iget.found");
221 read_unlock(&pag
->pag_ici_lock
);
222 XFS_STATS_INC(xs_ig_missed
);
225 * Read the disk inode attributes into a new inode structure and get
226 * a new vnode for it. This should also initialize i_ino and i_mount.
228 error
= xfs_iread(mp
, tp
, ino
, &ip
, bno
,
229 (flags
& XFS_IGET_BULKSTAT
) ? XFS_IMAP_BULKSTAT
: 0);
231 xfs_put_perag(mp
, pag
);
235 xfs_itrace_exit_tag(ip
, "xfs_iget.alloc");
237 xfs_inode_lock_init(ip
, vp
);
238 xfs_iocore_inode_init(ip
);
240 xfs_ilock(ip
, lock_flags
);
242 if ((ip
->i_d
.di_mode
== 0) && !(flags
& XFS_IGET_CREATE
)) {
244 xfs_put_perag(mp
, pag
);
249 * This is a bit messy - we preallocate everything we _might_
250 * need before we pick up the ici lock. That way we don't have to
251 * juggle locks and go all the way back to the start.
253 new_icl
= kmem_zone_alloc(xfs_icluster_zone
, KM_SLEEP
);
254 if (radix_tree_preload(GFP_KERNEL
)) {
258 mask
= ~(((XFS_INODE_CLUSTER_SIZE(mp
) >> mp
->m_sb
.sb_inodelog
)) - 1);
259 first_index
= agino
& mask
;
260 write_lock(&pag
->pag_ici_lock
);
263 * Find the cluster if it exists
266 if (radix_tree_gang_lookup(&pag
->pag_ici_root
, (void**)&iq
,
268 if ((XFS_INO_TO_AGINO(mp
, iq
->i_ino
) & mask
) == first_index
)
273 * insert the new inode
275 error
= radix_tree_insert(&pag
->pag_ici_root
, agino
, ip
);
276 if (unlikely(error
)) {
277 BUG_ON(error
!= -EEXIST
);
278 write_unlock(&pag
->pag_ici_lock
);
279 radix_tree_preload_end();
281 XFS_STATS_INC(xs_ig_dup
);
286 * These values _must_ be set before releasing ihlock!
288 ip
->i_udquot
= ip
->i_gdquot
= NULL
;
289 xfs_iflags_set(ip
, XFS_INEW
);
291 ASSERT(ip
->i_cluster
== NULL
);
294 spin_lock_init(&new_icl
->icl_lock
);
295 INIT_HLIST_HEAD(&new_icl
->icl_inodes
);
299 ASSERT(!hlist_empty(&icl
->icl_inodes
));
301 spin_lock(&icl
->icl_lock
);
302 hlist_add_head(&ip
->i_cnode
, &icl
->icl_inodes
);
304 spin_unlock(&icl
->icl_lock
);
306 write_unlock(&pag
->pag_ici_lock
);
307 radix_tree_preload_end();
309 kmem_zone_free(xfs_icluster_zone
, new_icl
);
312 * Link ip to its mount and thread it on the mount's inode list.
315 if ((iq
= mp
->m_inodes
)) {
316 ASSERT(iq
->i_mprev
->i_mnext
== iq
);
317 ip
->i_mprev
= iq
->i_mprev
;
318 iq
->i_mprev
->i_mnext
= ip
;
327 XFS_MOUNT_IUNLOCK(mp
);
328 xfs_put_perag(mp
, pag
);
331 ASSERT(ip
->i_df
.if_ext_max
==
332 XFS_IFORK_DSIZE(ip
) / sizeof(xfs_bmbt_rec_t
));
334 ASSERT(((ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) != 0) ==
335 ((ip
->i_iocore
.io_flags
& XFS_IOCORE_RT
) != 0));
337 xfs_iflags_set(ip
, XFS_IMODIFIED
);
341 * If we have a real type for an on-disk inode, we can set ops(&unlock)
342 * now. If it's a new inode being created, xfs_ialloc will handle it.
344 xfs_initialize_vnode(mp
, vp
, ip
);
350 * The 'normal' internal xfs_iget, if needed it will
351 * 'allocate', or 'get', the vnode.
364 bhv_vnode_t
*vp
= NULL
;
367 XFS_STATS_INC(xs_ig_attempts
);
370 inode
= iget_locked(mp
->m_super
, ino
);
374 vp
= vn_from_inode(inode
);
375 if (inode
->i_state
& I_NEW
) {
376 vn_initialize(inode
);
377 error
= xfs_iget_core(vp
, mp
, tp
, ino
, flags
,
378 lock_flags
, ipp
, bno
);
381 if (inode
->i_state
& I_NEW
)
382 unlock_new_inode(inode
);
387 * If the inode is not fully constructed due to
388 * filehandle mismatches wait for the inode to go
389 * away and try again.
391 * iget_locked will call __wait_on_freeing_inode
392 * to wait for the inode to go away.
394 if (is_bad_inode(inode
) ||
395 ((ip
= xfs_vtoi(vp
)) == NULL
)) {
402 xfs_ilock(ip
, lock_flags
);
403 XFS_STATS_INC(xs_ig_found
);
408 error
= ENOMEM
; /* If we got no inode we are out of memory */
414 * Do the setup for the various locks within the incore inode.
421 mrlock_init(&ip
->i_lock
, MRLOCK_ALLOW_EQUAL_PRI
|MRLOCK_BARRIER
,
422 "xfsino", ip
->i_ino
);
423 mrlock_init(&ip
->i_iolock
, MRLOCK_BARRIER
, "xfsio", ip
->i_ino
);
424 init_waitqueue_head(&ip
->i_ipin_wait
);
425 atomic_set(&ip
->i_pincount
, 0);
426 initnsema(&ip
->i_flock
, 1, "xfsfino");
430 * Look for the inode corresponding to the given ino in the hash table.
431 * If it is there and its i_transp pointer matches tp, return it.
432 * Otherwise, return NULL.
435 xfs_inode_incore(xfs_mount_t
*mp
,
442 pag
= xfs_get_perag(mp
, ino
);
443 read_lock(&pag
->pag_ici_lock
);
444 ip
= radix_tree_lookup(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ino
));
445 read_unlock(&pag
->pag_ici_lock
);
446 xfs_put_perag(mp
, pag
);
448 /* the returned inode must match the transaction */
449 if (ip
&& (ip
->i_transp
!= tp
))
455 * Decrement reference count of an inode structure and unlock it.
457 * ip -- the inode being released
458 * lock_flags -- this parameter indicates the inode's locks to be
459 * to be released. See the comment on xfs_iunlock() for a list
463 xfs_iput(xfs_inode_t
*ip
,
466 bhv_vnode_t
*vp
= XFS_ITOV(ip
);
468 xfs_itrace_entry(ip
);
469 xfs_iunlock(ip
, lock_flags
);
474 * Special iput for brand-new inodes that are still locked
477 xfs_iput_new(xfs_inode_t
*ip
,
480 bhv_vnode_t
*vp
= XFS_ITOV(ip
);
481 struct inode
*inode
= vn_to_inode(vp
);
483 xfs_itrace_entry(ip
);
485 if ((ip
->i_d
.di_mode
== 0)) {
486 ASSERT(!xfs_iflags_test(ip
, XFS_IRECLAIMABLE
));
489 if (inode
->i_state
& I_NEW
)
490 unlock_new_inode(inode
);
492 xfs_iunlock(ip
, lock_flags
);
498 * This routine embodies the part of the reclaim code that pulls
499 * the inode from the inode hash table and the mount structure's
501 * This should only be called from xfs_reclaim().
504 xfs_ireclaim(xfs_inode_t
*ip
)
509 * Remove from old hash list and mount list.
511 XFS_STATS_INC(xs_ig_reclaims
);
516 * Here we do a spurious inode lock in order to coordinate with
517 * xfs_sync(). This is because xfs_sync() references the inodes
518 * in the mount list without taking references on the corresponding
519 * vnodes. We make that OK here by ensuring that we wait until
520 * the inode is unlocked in xfs_sync() before we go ahead and
521 * free it. We get both the regular lock and the io lock because
522 * the xfs_sync() code may need to drop the regular one but will
523 * still hold the io lock.
525 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
528 * Release dquots (and their references) if any. An inode may escape
529 * xfs_inactive and get here via vn_alloc->vn_reclaim path.
531 XFS_QM_DQDETACH(ip
->i_mount
, ip
);
534 * Pull our behavior descriptor from the vnode chain.
536 vp
= XFS_ITOV_NULL(ip
);
538 vn_to_inode(vp
)->i_private
= NULL
;
543 * Free all memory associated with the inode.
545 xfs_iunlock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
550 * This routine removes an about-to-be-destroyed inode from
551 * all of the lists in which it is located with the exception
552 * of the behavior chain.
558 xfs_mount_t
*mp
= ip
->i_mount
;
559 xfs_perag_t
*pag
= xfs_get_perag(mp
, ip
->i_ino
);
562 write_lock(&pag
->pag_ici_lock
);
563 radix_tree_delete(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ip
->i_ino
));
564 write_unlock(&pag
->pag_ici_lock
);
565 xfs_put_perag(mp
, pag
);
568 * Remove from cluster list
571 spin_lock(&ip
->i_cluster
->icl_lock
);
572 hlist_del(&ip
->i_cnode
);
573 spin_unlock(&ip
->i_cluster
->icl_lock
);
575 /* was last inode in cluster? */
576 if (hlist_empty(&ip
->i_cluster
->icl_inodes
))
577 kmem_zone_free(xfs_icluster_zone
, ip
->i_cluster
);
580 * Remove from mount's inode list.
583 ASSERT((ip
->i_mnext
!= NULL
) && (ip
->i_mprev
!= NULL
));
585 iq
->i_mprev
= ip
->i_mprev
;
586 ip
->i_mprev
->i_mnext
= iq
;
589 * Fix up the head pointer if it points to the inode being deleted.
591 if (mp
->m_inodes
== ip
) {
599 /* Deal with the deleted inodes list */
600 list_del_init(&ip
->i_reclaim
);
603 XFS_MOUNT_IUNLOCK(mp
);
607 * This is a wrapper routine around the xfs_ilock() routine
608 * used to centralize some grungy code. It is used in places
609 * that wish to lock the inode solely for reading the extents.
610 * The reason these places can't just call xfs_ilock(SHARED)
611 * is that the inode lock also guards to bringing in of the
612 * extents from disk for a file in b-tree format. If the inode
613 * is in b-tree format, then we need to lock the inode exclusively
614 * until the extents are read in. Locking it exclusively all
615 * the time would limit our parallelism unnecessarily, though.
616 * What we do instead is check to see if the extents have been
617 * read in yet, and only lock the inode exclusively if they
620 * The function returns a value which should be given to the
621 * corresponding xfs_iunlock_map_shared(). This value is
622 * the mode in which the lock was actually taken.
625 xfs_ilock_map_shared(
630 if ((ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) &&
631 ((ip
->i_df
.if_flags
& XFS_IFEXTENTS
) == 0)) {
632 lock_mode
= XFS_ILOCK_EXCL
;
634 lock_mode
= XFS_ILOCK_SHARED
;
637 xfs_ilock(ip
, lock_mode
);
643 * This is simply the unlock routine to go with xfs_ilock_map_shared().
644 * All it does is call xfs_iunlock() with the given lock_mode.
647 xfs_iunlock_map_shared(
649 unsigned int lock_mode
)
651 xfs_iunlock(ip
, lock_mode
);
655 * The xfs inode contains 2 locks: a multi-reader lock called the
656 * i_iolock and a multi-reader lock called the i_lock. This routine
657 * allows either or both of the locks to be obtained.
659 * The 2 locks should always be ordered so that the IO lock is
660 * obtained first in order to prevent deadlock.
662 * ip -- the inode being locked
663 * lock_flags -- this parameter indicates the inode's locks
664 * to be locked. It can be:
669 * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
670 * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
671 * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
672 * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
675 xfs_ilock(xfs_inode_t
*ip
,
679 * You can't set both SHARED and EXCL for the same lock,
680 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
681 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
683 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
684 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
685 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
686 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
687 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
689 if (lock_flags
& XFS_IOLOCK_EXCL
) {
690 mrupdate_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
691 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
692 mraccess_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
694 if (lock_flags
& XFS_ILOCK_EXCL
) {
695 mrupdate_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
696 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
697 mraccess_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
699 xfs_ilock_trace(ip
, 1, lock_flags
, (inst_t
*)__return_address
);
703 * This is just like xfs_ilock(), except that the caller
704 * is guaranteed not to sleep. It returns 1 if it gets
705 * the requested locks and 0 otherwise. If the IO lock is
706 * obtained but the inode lock cannot be, then the IO lock
707 * is dropped before returning.
709 * ip -- the inode being locked
710 * lock_flags -- this parameter indicates the inode's locks to be
711 * to be locked. See the comment for xfs_ilock() for a list
716 xfs_ilock_nowait(xfs_inode_t
*ip
,
723 * You can't set both SHARED and EXCL for the same lock,
724 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
725 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
727 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
728 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
729 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
730 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
731 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
734 if (lock_flags
& XFS_IOLOCK_EXCL
) {
735 iolocked
= mrtryupdate(&ip
->i_iolock
);
739 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
740 iolocked
= mrtryaccess(&ip
->i_iolock
);
745 if (lock_flags
& XFS_ILOCK_EXCL
) {
746 ilocked
= mrtryupdate(&ip
->i_lock
);
749 mrunlock(&ip
->i_iolock
);
753 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
754 ilocked
= mrtryaccess(&ip
->i_lock
);
757 mrunlock(&ip
->i_iolock
);
762 xfs_ilock_trace(ip
, 2, lock_flags
, (inst_t
*)__return_address
);
767 * xfs_iunlock() is used to drop the inode locks acquired with
768 * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
769 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
770 * that we know which locks to drop.
772 * ip -- the inode being unlocked
773 * lock_flags -- this parameter indicates the inode's locks to be
774 * to be unlocked. See the comment for xfs_ilock() for a list
775 * of valid values for this parameter.
779 xfs_iunlock(xfs_inode_t
*ip
,
783 * You can't set both SHARED and EXCL for the same lock,
784 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
785 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
787 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
788 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
789 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
790 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
791 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_IUNLOCK_NONOTIFY
|
792 XFS_LOCK_DEP_MASK
)) == 0);
793 ASSERT(lock_flags
!= 0);
795 if (lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) {
796 ASSERT(!(lock_flags
& XFS_IOLOCK_SHARED
) ||
797 (ismrlocked(&ip
->i_iolock
, MR_ACCESS
)));
798 ASSERT(!(lock_flags
& XFS_IOLOCK_EXCL
) ||
799 (ismrlocked(&ip
->i_iolock
, MR_UPDATE
)));
800 mrunlock(&ip
->i_iolock
);
803 if (lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) {
804 ASSERT(!(lock_flags
& XFS_ILOCK_SHARED
) ||
805 (ismrlocked(&ip
->i_lock
, MR_ACCESS
)));
806 ASSERT(!(lock_flags
& XFS_ILOCK_EXCL
) ||
807 (ismrlocked(&ip
->i_lock
, MR_UPDATE
)));
808 mrunlock(&ip
->i_lock
);
811 * Let the AIL know that this item has been unlocked in case
812 * it is in the AIL and anyone is waiting on it. Don't do
813 * this if the caller has asked us not to.
815 if (!(lock_flags
& XFS_IUNLOCK_NONOTIFY
) &&
816 ip
->i_itemp
!= NULL
) {
817 xfs_trans_unlocked_item(ip
->i_mount
,
818 (xfs_log_item_t
*)(ip
->i_itemp
));
821 xfs_ilock_trace(ip
, 3, lock_flags
, (inst_t
*)__return_address
);
825 * give up write locks. the i/o lock cannot be held nested
826 * if it is being demoted.
829 xfs_ilock_demote(xfs_inode_t
*ip
,
832 ASSERT(lock_flags
& (XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
));
833 ASSERT((lock_flags
& ~(XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
)) == 0);
835 if (lock_flags
& XFS_ILOCK_EXCL
) {
836 ASSERT(ismrlocked(&ip
->i_lock
, MR_UPDATE
));
837 mrdemote(&ip
->i_lock
);
839 if (lock_flags
& XFS_IOLOCK_EXCL
) {
840 ASSERT(ismrlocked(&ip
->i_iolock
, MR_UPDATE
));
841 mrdemote(&ip
->i_iolock
);
846 * The following three routines simply manage the i_flock
847 * semaphore embedded in the inode. This semaphore synchronizes
848 * processes attempting to flush the in-core inode back to disk.
851 xfs_iflock(xfs_inode_t
*ip
)
853 psema(&(ip
->i_flock
), PINOD
|PLTWAIT
);
857 xfs_iflock_nowait(xfs_inode_t
*ip
)
859 return (cpsema(&(ip
->i_flock
)));
863 xfs_ifunlock(xfs_inode_t
*ip
)
865 ASSERT(issemalocked(&(ip
->i_flock
)));
866 vsema(&(ip
->i_flock
));