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 vn_trace_exit(vp
, "xfs_iget.alloc",
161 (inst_t
*)__return_address
);
163 XFS_STATS_INC(xs_ig_found
);
165 xfs_iflags_clear(ip
, XFS_IRECLAIMABLE
);
166 read_unlock(&pag
->pag_ici_lock
);
169 list_del_init(&ip
->i_reclaim
);
170 XFS_MOUNT_IUNLOCK(mp
);
174 } else if (vp
!= inode_vp
) {
175 struct inode
*inode
= vn_to_inode(inode_vp
);
177 /* The inode is being torn down, pause and
180 if (inode
->i_state
& (I_FREEING
| I_CLEAR
)) {
181 read_unlock(&pag
->pag_ici_lock
);
183 XFS_STATS_INC(xs_ig_frecycle
);
187 /* Chances are the other vnode (the one in the inode) is being torn
188 * down right now, and we landed on top of it. Question is, what do
189 * we do? Unhook the old inode and hook up the new one?
192 "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
199 read_unlock(&pag
->pag_ici_lock
);
200 XFS_STATS_INC(xs_ig_found
);
203 if (ip
->i_d
.di_mode
== 0) {
204 if (!(flags
& XFS_IGET_CREATE
)) {
205 xfs_put_perag(mp
, pag
);
208 xfs_iocore_inode_reinit(ip
);
212 xfs_ilock(ip
, lock_flags
);
214 xfs_iflags_clear(ip
, XFS_ISTALE
);
215 vn_trace_exit(vp
, "xfs_iget.found",
216 (inst_t
*)__return_address
);
223 read_unlock(&pag
->pag_ici_lock
);
224 XFS_STATS_INC(xs_ig_missed
);
227 * Read the disk inode attributes into a new inode structure and get
228 * a new vnode for it. This should also initialize i_ino and i_mount.
230 error
= xfs_iread(mp
, tp
, ino
, &ip
, bno
,
231 (flags
& XFS_IGET_BULKSTAT
) ? XFS_IMAP_BULKSTAT
: 0);
233 xfs_put_perag(mp
, pag
);
237 vn_trace_exit(vp
, "xfs_iget.alloc", (inst_t
*)__return_address
);
239 xfs_inode_lock_init(ip
, vp
);
240 xfs_iocore_inode_init(ip
);
242 xfs_ilock(ip
, lock_flags
);
244 if ((ip
->i_d
.di_mode
== 0) && !(flags
& XFS_IGET_CREATE
)) {
246 xfs_put_perag(mp
, pag
);
251 * This is a bit messy - we preallocate everything we _might_
252 * need before we pick up the ici lock. That way we don't have to
253 * juggle locks and go all the way back to the start.
255 new_icl
= kmem_zone_alloc(xfs_icluster_zone
, KM_SLEEP
);
256 if (radix_tree_preload(GFP_KERNEL
)) {
260 mask
= ~(((XFS_INODE_CLUSTER_SIZE(mp
) >> mp
->m_sb
.sb_inodelog
)) - 1);
261 first_index
= agino
& mask
;
262 write_lock(&pag
->pag_ici_lock
);
265 * Find the cluster if it exists
268 if (radix_tree_gang_lookup(&pag
->pag_ici_root
, (void**)&iq
,
270 if ((iq
->i_ino
& mask
) == first_index
)
275 * insert the new inode
277 error
= radix_tree_insert(&pag
->pag_ici_root
, agino
, ip
);
278 if (unlikely(error
)) {
279 BUG_ON(error
!= -EEXIST
);
280 write_unlock(&pag
->pag_ici_lock
);
281 radix_tree_preload_end();
283 XFS_STATS_INC(xs_ig_dup
);
288 * These values _must_ be set before releasing ihlock!
290 ip
->i_udquot
= ip
->i_gdquot
= NULL
;
291 xfs_iflags_set(ip
, XFS_INEW
);
293 ASSERT(ip
->i_cluster
== NULL
);
296 spin_lock_init(&new_icl
->icl_lock
);
297 INIT_HLIST_HEAD(&new_icl
->icl_inodes
);
301 ASSERT(!hlist_empty(&icl
->icl_inodes
));
303 spin_lock(&icl
->icl_lock
);
304 hlist_add_head(&ip
->i_cnode
, &icl
->icl_inodes
);
306 spin_unlock(&icl
->icl_lock
);
308 write_unlock(&pag
->pag_ici_lock
);
309 radix_tree_preload_end();
311 kmem_zone_free(xfs_icluster_zone
, new_icl
);
314 * Link ip to its mount and thread it on the mount's inode list.
317 if ((iq
= mp
->m_inodes
)) {
318 ASSERT(iq
->i_mprev
->i_mnext
== iq
);
319 ip
->i_mprev
= iq
->i_mprev
;
320 iq
->i_mprev
->i_mnext
= ip
;
329 XFS_MOUNT_IUNLOCK(mp
);
330 xfs_put_perag(mp
, pag
);
333 ASSERT(ip
->i_df
.if_ext_max
==
334 XFS_IFORK_DSIZE(ip
) / sizeof(xfs_bmbt_rec_t
));
336 ASSERT(((ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) != 0) ==
337 ((ip
->i_iocore
.io_flags
& XFS_IOCORE_RT
) != 0));
342 * If we have a real type for an on-disk inode, we can set ops(&unlock)
343 * now. If it's a new inode being created, xfs_ialloc will handle it.
345 bhv_vfs_init_vnode(XFS_MTOVFS(mp
), vp
, ip
, 1);
352 * The 'normal' internal xfs_iget, if needed it will
353 * 'allocate', or 'get', the vnode.
366 bhv_vnode_t
*vp
= NULL
;
369 XFS_STATS_INC(xs_ig_attempts
);
372 if ((inode
= iget_locked(XFS_MTOVFS(mp
)->vfs_super
, ino
))) {
375 vp
= vn_from_inode(inode
);
376 if (inode
->i_state
& I_NEW
) {
377 vn_initialize(inode
);
378 error
= xfs_iget_core(vp
, mp
, tp
, ino
, flags
,
379 lock_flags
, ipp
, bno
);
382 if (inode
->i_state
& I_NEW
)
383 unlock_new_inode(inode
);
388 * If the inode is not fully constructed due to
389 * filehandle mismatches wait for the inode to go
390 * away and try again.
392 * iget_locked will call __wait_on_freeing_inode
393 * to wait for the inode to go away.
395 if (is_bad_inode(inode
) ||
396 ((ip
= xfs_vtoi(vp
)) == NULL
)) {
403 xfs_ilock(ip
, lock_flags
);
404 XFS_STATS_INC(xs_ig_found
);
409 error
= ENOMEM
; /* If we got no inode we are out of memory */
415 * Do the setup for the various locks within the incore inode.
422 mrlock_init(&ip
->i_lock
, MRLOCK_ALLOW_EQUAL_PRI
|MRLOCK_BARRIER
,
423 "xfsino", (long)vp
->v_number
);
424 mrlock_init(&ip
->i_iolock
, MRLOCK_BARRIER
, "xfsio", vp
->v_number
);
425 init_waitqueue_head(&ip
->i_ipin_wait
);
426 atomic_set(&ip
->i_pincount
, 0);
427 initnsema(&ip
->i_flock
, 1, "xfsfino");
431 * Look for the inode corresponding to the given ino in the hash table.
432 * If it is there and its i_transp pointer matches tp, return it.
433 * Otherwise, return NULL.
436 xfs_inode_incore(xfs_mount_t
*mp
,
443 pag
= xfs_get_perag(mp
, ino
);
444 read_lock(&pag
->pag_ici_lock
);
445 ip
= radix_tree_lookup(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ino
));
446 read_unlock(&pag
->pag_ici_lock
);
447 xfs_put_perag(mp
, pag
);
449 /* the returned inode must match the transaction */
450 if (ip
&& (ip
->i_transp
!= tp
))
456 * Decrement reference count of an inode structure and unlock it.
458 * ip -- the inode being released
459 * lock_flags -- this parameter indicates the inode's locks to be
460 * to be released. See the comment on xfs_iunlock() for a list
464 xfs_iput(xfs_inode_t
*ip
,
467 bhv_vnode_t
*vp
= XFS_ITOV(ip
);
469 vn_trace_entry(vp
, "xfs_iput", (inst_t
*)__return_address
);
470 xfs_iunlock(ip
, lock_flags
);
475 * Special iput for brand-new inodes that are still locked
478 xfs_iput_new(xfs_inode_t
*ip
,
481 bhv_vnode_t
*vp
= XFS_ITOV(ip
);
482 struct inode
*inode
= vn_to_inode(vp
);
484 vn_trace_entry(vp
, "xfs_iput_new", (inst_t
*)__return_address
);
486 if ((ip
->i_d
.di_mode
== 0)) {
487 ASSERT(!xfs_iflags_test(ip
, XFS_IRECLAIMABLE
));
490 if (inode
->i_state
& I_NEW
)
491 unlock_new_inode(inode
);
493 xfs_iunlock(ip
, lock_flags
);
499 * This routine embodies the part of the reclaim code that pulls
500 * the inode from the inode hash table and the mount structure's
502 * This should only be called from xfs_reclaim().
505 xfs_ireclaim(xfs_inode_t
*ip
)
510 * Remove from old hash list and mount list.
512 XFS_STATS_INC(xs_ig_reclaims
);
517 * Here we do a spurious inode lock in order to coordinate with
518 * xfs_sync(). This is because xfs_sync() references the inodes
519 * in the mount list without taking references on the corresponding
520 * vnodes. We make that OK here by ensuring that we wait until
521 * the inode is unlocked in xfs_sync() before we go ahead and
522 * free it. We get both the regular lock and the io lock because
523 * the xfs_sync() code may need to drop the regular one but will
524 * still hold the io lock.
526 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
529 * Release dquots (and their references) if any. An inode may escape
530 * xfs_inactive and get here via vn_alloc->vn_reclaim path.
532 XFS_QM_DQDETACH(ip
->i_mount
, ip
);
535 * Pull our behavior descriptor from the vnode chain.
537 vp
= XFS_ITOV_NULL(ip
);
539 vn_to_inode(vp
)->i_private
= NULL
;
544 * Free all memory associated with the inode.
546 xfs_iunlock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
551 * This routine removes an about-to-be-destroyed inode from
552 * all of the lists in which it is located with the exception
553 * of the behavior chain.
559 xfs_mount_t
*mp
= ip
->i_mount
;
560 xfs_perag_t
*pag
= xfs_get_perag(mp
, ip
->i_ino
);
563 write_lock(&pag
->pag_ici_lock
);
564 radix_tree_delete(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ip
->i_ino
));
565 write_unlock(&pag
->pag_ici_lock
);
566 xfs_put_perag(mp
, pag
);
569 * Remove from cluster list
572 spin_lock(&ip
->i_cluster
->icl_lock
);
573 hlist_del(&ip
->i_cnode
);
574 spin_unlock(&ip
->i_cluster
->icl_lock
);
576 /* was last inode in cluster? */
577 if (hlist_empty(&ip
->i_cluster
->icl_inodes
))
578 kmem_zone_free(xfs_icluster_zone
, ip
->i_cluster
);
581 * Remove from mount's inode list.
584 ASSERT((ip
->i_mnext
!= NULL
) && (ip
->i_mprev
!= NULL
));
586 iq
->i_mprev
= ip
->i_mprev
;
587 ip
->i_mprev
->i_mnext
= iq
;
590 * Fix up the head pointer if it points to the inode being deleted.
592 if (mp
->m_inodes
== ip
) {
600 /* Deal with the deleted inodes list */
601 list_del_init(&ip
->i_reclaim
);
604 XFS_MOUNT_IUNLOCK(mp
);
608 * This is a wrapper routine around the xfs_ilock() routine
609 * used to centralize some grungy code. It is used in places
610 * that wish to lock the inode solely for reading the extents.
611 * The reason these places can't just call xfs_ilock(SHARED)
612 * is that the inode lock also guards to bringing in of the
613 * extents from disk for a file in b-tree format. If the inode
614 * is in b-tree format, then we need to lock the inode exclusively
615 * until the extents are read in. Locking it exclusively all
616 * the time would limit our parallelism unnecessarily, though.
617 * What we do instead is check to see if the extents have been
618 * read in yet, and only lock the inode exclusively if they
621 * The function returns a value which should be given to the
622 * corresponding xfs_iunlock_map_shared(). This value is
623 * the mode in which the lock was actually taken.
626 xfs_ilock_map_shared(
631 if ((ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) &&
632 ((ip
->i_df
.if_flags
& XFS_IFEXTENTS
) == 0)) {
633 lock_mode
= XFS_ILOCK_EXCL
;
635 lock_mode
= XFS_ILOCK_SHARED
;
638 xfs_ilock(ip
, lock_mode
);
644 * This is simply the unlock routine to go with xfs_ilock_map_shared().
645 * All it does is call xfs_iunlock() with the given lock_mode.
648 xfs_iunlock_map_shared(
650 unsigned int lock_mode
)
652 xfs_iunlock(ip
, lock_mode
);
656 * The xfs inode contains 2 locks: a multi-reader lock called the
657 * i_iolock and a multi-reader lock called the i_lock. This routine
658 * allows either or both of the locks to be obtained.
660 * The 2 locks should always be ordered so that the IO lock is
661 * obtained first in order to prevent deadlock.
663 * ip -- the inode being locked
664 * lock_flags -- this parameter indicates the inode's locks
665 * to be locked. It can be:
670 * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
671 * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
672 * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
673 * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
676 xfs_ilock(xfs_inode_t
*ip
,
680 * You can't set both SHARED and EXCL for the same lock,
681 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
682 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
684 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
685 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
686 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
687 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
688 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
690 if (lock_flags
& XFS_IOLOCK_EXCL
) {
691 mrupdate_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
692 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
693 mraccess_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
695 if (lock_flags
& XFS_ILOCK_EXCL
) {
696 mrupdate_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
697 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
698 mraccess_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
700 xfs_ilock_trace(ip
, 1, lock_flags
, (inst_t
*)__return_address
);
704 * This is just like xfs_ilock(), except that the caller
705 * is guaranteed not to sleep. It returns 1 if it gets
706 * the requested locks and 0 otherwise. If the IO lock is
707 * obtained but the inode lock cannot be, then the IO lock
708 * is dropped before returning.
710 * ip -- the inode being locked
711 * lock_flags -- this parameter indicates the inode's locks to be
712 * to be locked. See the comment for xfs_ilock() for a list
717 xfs_ilock_nowait(xfs_inode_t
*ip
,
724 * You can't set both SHARED and EXCL for the same lock,
725 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
726 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
728 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
729 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
730 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
731 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
732 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
735 if (lock_flags
& XFS_IOLOCK_EXCL
) {
736 iolocked
= mrtryupdate(&ip
->i_iolock
);
740 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
741 iolocked
= mrtryaccess(&ip
->i_iolock
);
746 if (lock_flags
& XFS_ILOCK_EXCL
) {
747 ilocked
= mrtryupdate(&ip
->i_lock
);
750 mrunlock(&ip
->i_iolock
);
754 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
755 ilocked
= mrtryaccess(&ip
->i_lock
);
758 mrunlock(&ip
->i_iolock
);
763 xfs_ilock_trace(ip
, 2, lock_flags
, (inst_t
*)__return_address
);
768 * xfs_iunlock() is used to drop the inode locks acquired with
769 * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
770 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
771 * that we know which locks to drop.
773 * ip -- the inode being unlocked
774 * lock_flags -- this parameter indicates the inode's locks to be
775 * to be unlocked. See the comment for xfs_ilock() for a list
776 * of valid values for this parameter.
780 xfs_iunlock(xfs_inode_t
*ip
,
784 * You can't set both SHARED and EXCL for the same lock,
785 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
786 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
788 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
789 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
790 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
791 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
792 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_IUNLOCK_NONOTIFY
|
793 XFS_LOCK_DEP_MASK
)) == 0);
794 ASSERT(lock_flags
!= 0);
796 if (lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) {
797 ASSERT(!(lock_flags
& XFS_IOLOCK_SHARED
) ||
798 (ismrlocked(&ip
->i_iolock
, MR_ACCESS
)));
799 ASSERT(!(lock_flags
& XFS_IOLOCK_EXCL
) ||
800 (ismrlocked(&ip
->i_iolock
, MR_UPDATE
)));
801 mrunlock(&ip
->i_iolock
);
804 if (lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) {
805 ASSERT(!(lock_flags
& XFS_ILOCK_SHARED
) ||
806 (ismrlocked(&ip
->i_lock
, MR_ACCESS
)));
807 ASSERT(!(lock_flags
& XFS_ILOCK_EXCL
) ||
808 (ismrlocked(&ip
->i_lock
, MR_UPDATE
)));
809 mrunlock(&ip
->i_lock
);
812 * Let the AIL know that this item has been unlocked in case
813 * it is in the AIL and anyone is waiting on it. Don't do
814 * this if the caller has asked us not to.
816 if (!(lock_flags
& XFS_IUNLOCK_NONOTIFY
) &&
817 ip
->i_itemp
!= NULL
) {
818 xfs_trans_unlocked_item(ip
->i_mount
,
819 (xfs_log_item_t
*)(ip
->i_itemp
));
822 xfs_ilock_trace(ip
, 3, lock_flags
, (inst_t
*)__return_address
);
826 * give up write locks. the i/o lock cannot be held nested
827 * if it is being demoted.
830 xfs_ilock_demote(xfs_inode_t
*ip
,
833 ASSERT(lock_flags
& (XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
));
834 ASSERT((lock_flags
& ~(XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
)) == 0);
836 if (lock_flags
& XFS_ILOCK_EXCL
) {
837 ASSERT(ismrlocked(&ip
->i_lock
, MR_UPDATE
));
838 mrdemote(&ip
->i_lock
);
840 if (lock_flags
& XFS_IOLOCK_EXCL
) {
841 ASSERT(ismrlocked(&ip
->i_iolock
, MR_UPDATE
));
842 mrdemote(&ip
->i_iolock
);
847 * The following three routines simply manage the i_flock
848 * semaphore embedded in the inode. This semaphore synchronizes
849 * processes attempting to flush the in-core inode back to disk.
852 xfs_iflock(xfs_inode_t
*ip
)
854 psema(&(ip
->i_flock
), PINOD
|PLTWAIT
);
858 xfs_iflock_nowait(xfs_inode_t
*ip
)
860 return (cpsema(&(ip
->i_flock
)));
864 xfs_ifunlock(xfs_inode_t
*ip
)
866 ASSERT(issemalocked(&(ip
->i_flock
)));
867 vsema(&(ip
->i_flock
));
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