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.
77 struct inode
*old_inode
;
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 old_inode
= ip
->i_vnode
;
115 if (old_inode
== 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
);
143 xfs_itrace_exit_tag(ip
, "xfs_iget.alloc");
145 XFS_STATS_INC(xs_ig_found
);
146 xfs_iflags_clear(ip
, XFS_IRECLAIMABLE
);
147 read_unlock(&pag
->pag_ici_lock
);
150 list_del_init(&ip
->i_reclaim
);
151 XFS_MOUNT_IUNLOCK(mp
);
155 } else if (inode
!= old_inode
) {
156 /* The inode is being torn down, pause and
159 if (old_inode
->i_state
& (I_FREEING
| I_CLEAR
)) {
160 read_unlock(&pag
->pag_ici_lock
);
162 XFS_STATS_INC(xs_ig_frecycle
);
166 /* Chances are the other vnode (the one in the inode) is being torn
167 * down right now, and we landed on top of it. Question is, what do
168 * we do? Unhook the old inode and hook up the new one?
171 "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
178 read_unlock(&pag
->pag_ici_lock
);
179 XFS_STATS_INC(xs_ig_found
);
182 if (ip
->i_d
.di_mode
== 0 && !(flags
& XFS_IGET_CREATE
)) {
183 xfs_put_perag(mp
, pag
);
188 xfs_ilock(ip
, lock_flags
);
190 xfs_iflags_clear(ip
, XFS_ISTALE
);
191 xfs_itrace_exit_tag(ip
, "xfs_iget.found");
198 read_unlock(&pag
->pag_ici_lock
);
199 XFS_STATS_INC(xs_ig_missed
);
202 * Read the disk inode attributes into a new inode structure and get
203 * a new vnode for it. This should also initialize i_ino and i_mount.
205 error
= xfs_iread(mp
, tp
, ino
, &ip
, bno
,
206 (flags
& XFS_IGET_BULKSTAT
) ? XFS_IMAP_BULKSTAT
: 0);
208 xfs_put_perag(mp
, pag
);
212 xfs_itrace_exit_tag(ip
, "xfs_iget.alloc");
215 mrlock_init(&ip
->i_lock
, MRLOCK_ALLOW_EQUAL_PRI
|MRLOCK_BARRIER
,
216 "xfsino", ip
->i_ino
);
217 mrlock_init(&ip
->i_iolock
, MRLOCK_BARRIER
, "xfsio", ip
->i_ino
);
218 init_waitqueue_head(&ip
->i_ipin_wait
);
219 atomic_set(&ip
->i_pincount
, 0);
220 initnsema(&ip
->i_flock
, 1, "xfsfino");
223 xfs_ilock(ip
, lock_flags
);
225 if ((ip
->i_d
.di_mode
== 0) && !(flags
& XFS_IGET_CREATE
)) {
227 xfs_put_perag(mp
, pag
);
232 * This is a bit messy - we preallocate everything we _might_
233 * need before we pick up the ici lock. That way we don't have to
234 * juggle locks and go all the way back to the start.
236 new_icl
= kmem_zone_alloc(xfs_icluster_zone
, KM_SLEEP
);
237 if (radix_tree_preload(GFP_KERNEL
)) {
238 <<<<<<< HEAD
:fs
/xfs
/xfs_iget
.c
241 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a
:fs
/xfs
/xfs_iget
.c
245 mask
= ~(((XFS_INODE_CLUSTER_SIZE(mp
) >> mp
->m_sb
.sb_inodelog
)) - 1);
246 first_index
= agino
& mask
;
247 write_lock(&pag
->pag_ici_lock
);
250 * Find the cluster if it exists
253 if (radix_tree_gang_lookup(&pag
->pag_ici_root
, (void**)&iq
,
255 if ((XFS_INO_TO_AGINO(mp
, iq
->i_ino
) & mask
) == first_index
)
260 * insert the new inode
262 error
= radix_tree_insert(&pag
->pag_ici_root
, agino
, ip
);
263 if (unlikely(error
)) {
264 BUG_ON(error
!= -EEXIST
);
265 write_unlock(&pag
->pag_ici_lock
);
266 radix_tree_preload_end();
268 XFS_STATS_INC(xs_ig_dup
);
273 * These values _must_ be set before releasing ihlock!
275 ip
->i_udquot
= ip
->i_gdquot
= NULL
;
276 xfs_iflags_set(ip
, XFS_INEW
);
278 ASSERT(ip
->i_cluster
== NULL
);
281 spin_lock_init(&new_icl
->icl_lock
);
282 INIT_HLIST_HEAD(&new_icl
->icl_inodes
);
286 ASSERT(!hlist_empty(&icl
->icl_inodes
));
288 spin_lock(&icl
->icl_lock
);
289 hlist_add_head(&ip
->i_cnode
, &icl
->icl_inodes
);
291 spin_unlock(&icl
->icl_lock
);
293 write_unlock(&pag
->pag_ici_lock
);
294 radix_tree_preload_end();
296 kmem_zone_free(xfs_icluster_zone
, new_icl
);
299 * Link ip to its mount and thread it on the mount's inode list.
302 if ((iq
= mp
->m_inodes
)) {
303 ASSERT(iq
->i_mprev
->i_mnext
== iq
);
304 ip
->i_mprev
= iq
->i_mprev
;
305 iq
->i_mprev
->i_mnext
= ip
;
314 XFS_MOUNT_IUNLOCK(mp
);
315 xfs_put_perag(mp
, pag
);
318 ASSERT(ip
->i_df
.if_ext_max
==
319 XFS_IFORK_DSIZE(ip
) / sizeof(xfs_bmbt_rec_t
));
321 xfs_iflags_set(ip
, XFS_IMODIFIED
);
325 * If we have a real type for an on-disk inode, we can set ops(&unlock)
326 * now. If it's a new inode being created, xfs_ialloc will handle it.
328 xfs_initialize_vnode(mp
, inode
, ip
);
334 * The 'normal' internal xfs_iget, if needed it will
335 * 'allocate', or 'get', the vnode.
351 XFS_STATS_INC(xs_ig_attempts
);
354 inode
= iget_locked(mp
->m_super
, ino
);
356 /* If we got no inode we are out of memory */
359 if (inode
->i_state
& I_NEW
) {
360 XFS_STATS_INC(vn_active
);
361 XFS_STATS_INC(vn_alloc
);
363 error
= xfs_iget_core(inode
, mp
, tp
, ino
, flags
,
364 lock_flags
, ipp
, bno
);
366 make_bad_inode(inode
);
367 if (inode
->i_state
& I_NEW
)
368 unlock_new_inode(inode
);
375 * If the inode is not fully constructed due to
376 * filehandle mismatches wait for the inode to go
377 * away and try again.
379 * iget_locked will call __wait_on_freeing_inode
380 * to wait for the inode to go away.
382 if (is_bad_inode(inode
)) {
396 xfs_ilock(ip
, lock_flags
);
397 XFS_STATS_INC(xs_ig_found
);
403 * Look for the inode corresponding to the given ino in the hash table.
404 * If it is there and its i_transp pointer matches tp, return it.
405 * Otherwise, return NULL.
408 xfs_inode_incore(xfs_mount_t
*mp
,
415 pag
= xfs_get_perag(mp
, ino
);
416 read_lock(&pag
->pag_ici_lock
);
417 ip
= radix_tree_lookup(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ino
));
418 read_unlock(&pag
->pag_ici_lock
);
419 xfs_put_perag(mp
, pag
);
421 /* the returned inode must match the transaction */
422 if (ip
&& (ip
->i_transp
!= tp
))
428 * Decrement reference count of an inode structure and unlock it.
430 * ip -- the inode being released
431 * lock_flags -- this parameter indicates the inode's locks to be
432 * to be released. See the comment on xfs_iunlock() for a list
436 xfs_iput(xfs_inode_t
*ip
,
439 xfs_itrace_entry(ip
);
440 xfs_iunlock(ip
, lock_flags
);
445 * Special iput for brand-new inodes that are still locked
448 xfs_iput_new(xfs_inode_t
*ip
,
451 struct inode
*inode
= ip
->i_vnode
;
453 xfs_itrace_entry(ip
);
455 if ((ip
->i_d
.di_mode
== 0)) {
456 ASSERT(!xfs_iflags_test(ip
, XFS_IRECLAIMABLE
));
457 make_bad_inode(inode
);
459 if (inode
->i_state
& I_NEW
)
460 unlock_new_inode(inode
);
462 xfs_iunlock(ip
, lock_flags
);
468 * This routine embodies the part of the reclaim code that pulls
469 * the inode from the inode hash table and the mount structure's
471 * This should only be called from xfs_reclaim().
474 xfs_ireclaim(xfs_inode_t
*ip
)
477 * Remove from old hash list and mount list.
479 XFS_STATS_INC(xs_ig_reclaims
);
484 * Here we do a spurious inode lock in order to coordinate with
485 * xfs_sync(). This is because xfs_sync() references the inodes
486 * in the mount list without taking references on the corresponding
487 * vnodes. We make that OK here by ensuring that we wait until
488 * the inode is unlocked in xfs_sync() before we go ahead and
489 * free it. We get both the regular lock and the io lock because
490 * the xfs_sync() code may need to drop the regular one but will
491 * still hold the io lock.
493 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
496 * Release dquots (and their references) if any. An inode may escape
497 * xfs_inactive and get here via vn_alloc->vn_reclaim path.
499 XFS_QM_DQDETACH(ip
->i_mount
, ip
);
502 * Pull our behavior descriptor from the vnode chain.
505 ip
->i_vnode
->i_private
= NULL
;
510 * Free all memory associated with the inode.
512 xfs_iunlock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
517 * This routine removes an about-to-be-destroyed inode from
518 * all of the lists in which it is located with the exception
519 * of the behavior chain.
525 xfs_mount_t
*mp
= ip
->i_mount
;
526 xfs_perag_t
*pag
= xfs_get_perag(mp
, ip
->i_ino
);
529 write_lock(&pag
->pag_ici_lock
);
530 radix_tree_delete(&pag
->pag_ici_root
, XFS_INO_TO_AGINO(mp
, ip
->i_ino
));
531 write_unlock(&pag
->pag_ici_lock
);
532 xfs_put_perag(mp
, pag
);
535 * Remove from cluster list
538 spin_lock(&ip
->i_cluster
->icl_lock
);
539 hlist_del(&ip
->i_cnode
);
540 spin_unlock(&ip
->i_cluster
->icl_lock
);
542 /* was last inode in cluster? */
543 if (hlist_empty(&ip
->i_cluster
->icl_inodes
))
544 kmem_zone_free(xfs_icluster_zone
, ip
->i_cluster
);
547 * Remove from mount's inode list.
550 ASSERT((ip
->i_mnext
!= NULL
) && (ip
->i_mprev
!= NULL
));
552 iq
->i_mprev
= ip
->i_mprev
;
553 ip
->i_mprev
->i_mnext
= iq
;
556 * Fix up the head pointer if it points to the inode being deleted.
558 if (mp
->m_inodes
== ip
) {
566 /* Deal with the deleted inodes list */
567 list_del_init(&ip
->i_reclaim
);
570 XFS_MOUNT_IUNLOCK(mp
);
574 * This is a wrapper routine around the xfs_ilock() routine
575 * used to centralize some grungy code. It is used in places
576 * that wish to lock the inode solely for reading the extents.
577 * The reason these places can't just call xfs_ilock(SHARED)
578 * is that the inode lock also guards to bringing in of the
579 * extents from disk for a file in b-tree format. If the inode
580 * is in b-tree format, then we need to lock the inode exclusively
581 * until the extents are read in. Locking it exclusively all
582 * the time would limit our parallelism unnecessarily, though.
583 * What we do instead is check to see if the extents have been
584 * read in yet, and only lock the inode exclusively if they
587 * The function returns a value which should be given to the
588 * corresponding xfs_iunlock_map_shared(). This value is
589 * the mode in which the lock was actually taken.
592 xfs_ilock_map_shared(
597 if ((ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) &&
598 ((ip
->i_df
.if_flags
& XFS_IFEXTENTS
) == 0)) {
599 lock_mode
= XFS_ILOCK_EXCL
;
601 lock_mode
= XFS_ILOCK_SHARED
;
604 xfs_ilock(ip
, lock_mode
);
610 * This is simply the unlock routine to go with xfs_ilock_map_shared().
611 * All it does is call xfs_iunlock() with the given lock_mode.
614 xfs_iunlock_map_shared(
616 unsigned int lock_mode
)
618 xfs_iunlock(ip
, lock_mode
);
622 * The xfs inode contains 2 locks: a multi-reader lock called the
623 * i_iolock and a multi-reader lock called the i_lock. This routine
624 * allows either or both of the locks to be obtained.
626 * The 2 locks should always be ordered so that the IO lock is
627 * obtained first in order to prevent deadlock.
629 * ip -- the inode being locked
630 * lock_flags -- this parameter indicates the inode's locks
631 * to be locked. It can be:
636 * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
637 * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
638 * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
639 * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
642 xfs_ilock(xfs_inode_t
*ip
,
646 * You can't set both SHARED and EXCL for the same lock,
647 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
648 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
650 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
651 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
652 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
653 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
654 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
656 if (lock_flags
& XFS_IOLOCK_EXCL
) {
657 mrupdate_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
658 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
659 mraccess_nested(&ip
->i_iolock
, XFS_IOLOCK_DEP(lock_flags
));
661 if (lock_flags
& XFS_ILOCK_EXCL
) {
662 mrupdate_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
663 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
664 mraccess_nested(&ip
->i_lock
, XFS_ILOCK_DEP(lock_flags
));
666 xfs_ilock_trace(ip
, 1, lock_flags
, (inst_t
*)__return_address
);
670 * This is just like xfs_ilock(), except that the caller
671 * is guaranteed not to sleep. It returns 1 if it gets
672 * the requested locks and 0 otherwise. If the IO lock is
673 * obtained but the inode lock cannot be, then the IO lock
674 * is dropped before returning.
676 * ip -- the inode being locked
677 * lock_flags -- this parameter indicates the inode's locks to be
678 * to be locked. See the comment for xfs_ilock() for a list
683 xfs_ilock_nowait(xfs_inode_t
*ip
,
690 * You can't set both SHARED and EXCL for the same lock,
691 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
692 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
694 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
695 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
696 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
697 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
698 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_LOCK_DEP_MASK
)) == 0);
701 if (lock_flags
& XFS_IOLOCK_EXCL
) {
702 iolocked
= mrtryupdate(&ip
->i_iolock
);
706 } else if (lock_flags
& XFS_IOLOCK_SHARED
) {
707 iolocked
= mrtryaccess(&ip
->i_iolock
);
712 if (lock_flags
& XFS_ILOCK_EXCL
) {
713 ilocked
= mrtryupdate(&ip
->i_lock
);
716 mrunlock(&ip
->i_iolock
);
720 } else if (lock_flags
& XFS_ILOCK_SHARED
) {
721 ilocked
= mrtryaccess(&ip
->i_lock
);
724 mrunlock(&ip
->i_iolock
);
729 xfs_ilock_trace(ip
, 2, lock_flags
, (inst_t
*)__return_address
);
734 * xfs_iunlock() is used to drop the inode locks acquired with
735 * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
736 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
737 * that we know which locks to drop.
739 * ip -- the inode being unlocked
740 * lock_flags -- this parameter indicates the inode's locks to be
741 * to be unlocked. See the comment for xfs_ilock() for a list
742 * of valid values for this parameter.
746 xfs_iunlock(xfs_inode_t
*ip
,
750 * You can't set both SHARED and EXCL for the same lock,
751 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
752 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
754 ASSERT((lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) !=
755 (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
));
756 ASSERT((lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) !=
757 (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
));
758 ASSERT((lock_flags
& ~(XFS_LOCK_MASK
| XFS_IUNLOCK_NONOTIFY
|
759 XFS_LOCK_DEP_MASK
)) == 0);
760 ASSERT(lock_flags
!= 0);
762 if (lock_flags
& (XFS_IOLOCK_SHARED
| XFS_IOLOCK_EXCL
)) {
763 ASSERT(!(lock_flags
& XFS_IOLOCK_SHARED
) ||
764 (ismrlocked(&ip
->i_iolock
, MR_ACCESS
)));
765 ASSERT(!(lock_flags
& XFS_IOLOCK_EXCL
) ||
766 (ismrlocked(&ip
->i_iolock
, MR_UPDATE
)));
767 mrunlock(&ip
->i_iolock
);
770 if (lock_flags
& (XFS_ILOCK_SHARED
| XFS_ILOCK_EXCL
)) {
771 ASSERT(!(lock_flags
& XFS_ILOCK_SHARED
) ||
772 (ismrlocked(&ip
->i_lock
, MR_ACCESS
)));
773 ASSERT(!(lock_flags
& XFS_ILOCK_EXCL
) ||
774 (ismrlocked(&ip
->i_lock
, MR_UPDATE
)));
775 mrunlock(&ip
->i_lock
);
778 * Let the AIL know that this item has been unlocked in case
779 * it is in the AIL and anyone is waiting on it. Don't do
780 * this if the caller has asked us not to.
782 if (!(lock_flags
& XFS_IUNLOCK_NONOTIFY
) &&
783 ip
->i_itemp
!= NULL
) {
784 xfs_trans_unlocked_item(ip
->i_mount
,
785 (xfs_log_item_t
*)(ip
->i_itemp
));
788 xfs_ilock_trace(ip
, 3, lock_flags
, (inst_t
*)__return_address
);
792 * give up write locks. the i/o lock cannot be held nested
793 * if it is being demoted.
796 xfs_ilock_demote(xfs_inode_t
*ip
,
799 ASSERT(lock_flags
& (XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
));
800 ASSERT((lock_flags
& ~(XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
)) == 0);
802 if (lock_flags
& XFS_ILOCK_EXCL
) {
803 ASSERT(ismrlocked(&ip
->i_lock
, MR_UPDATE
));
804 mrdemote(&ip
->i_lock
);
806 if (lock_flags
& XFS_IOLOCK_EXCL
) {
807 ASSERT(ismrlocked(&ip
->i_iolock
, MR_UPDATE
));
808 mrdemote(&ip
->i_iolock
);
813 * The following three routines simply manage the i_flock
814 * semaphore embedded in the inode. This semaphore synchronizes
815 * processes attempting to flush the in-core inode back to disk.
818 xfs_iflock(xfs_inode_t
*ip
)
820 psema(&(ip
->i_flock
), PINOD
|PLTWAIT
);
824 xfs_iflock_nowait(xfs_inode_t
*ip
)
826 return (cpsema(&(ip
->i_flock
)));
830 xfs_ifunlock(xfs_inode_t
*ip
)
832 ASSERT(issemalocked(&(ip
->i_flock
)));
833 vsema(&(ip
->i_flock
));