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 && !(flags & XFS_IGET_CREATE)) {
203 xfs_put_perag(mp, pag);
208 xfs_ilock(ip, lock_flags);
210 xfs_iflags_clear(ip, XFS_ISTALE);
211 xfs_itrace_exit_tag(ip, "xfs_iget.found");
218 read_unlock(&pag->pag_ici_lock);
219 XFS_STATS_INC(xs_ig_missed);
222 * Read the disk inode attributes into a new inode structure and get
223 * a new vnode for it. This should also initialize i_ino and i_mount.
225 error = xfs_iread(mp, tp, ino, &ip, bno,
226 (flags & XFS_IGET_BULKSTAT) ? XFS_IMAP_BULKSTAT : 0);
228 xfs_put_perag(mp, pag);
232 xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
234 xfs_inode_lock_init(ip, vp);
236 xfs_ilock(ip, lock_flags);
238 if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
240 xfs_put_perag(mp, pag);
245 * This is a bit messy - we preallocate everything we _might_
246 * need before we pick up the ici lock. That way we don't have to
247 * juggle locks and go all the way back to the start.
249 new_icl = kmem_zone_alloc(xfs_icluster_zone, KM_SLEEP);
250 if (radix_tree_preload(GFP_KERNEL)) {
254 mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
255 first_index = agino & mask;
256 write_lock(&pag->pag_ici_lock);
259 * Find the cluster if it exists
262 if (radix_tree_gang_lookup(&pag->pag_ici_root, (void**)&iq,
264 if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) == first_index)
269 * insert the new inode
271 error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
272 if (unlikely(error)) {
273 BUG_ON(error != -EEXIST);
274 write_unlock(&pag->pag_ici_lock);
275 radix_tree_preload_end();
277 XFS_STATS_INC(xs_ig_dup);
282 * These values _must_ be set before releasing ihlock!
284 ip->i_udquot = ip->i_gdquot = NULL;
285 xfs_iflags_set(ip, XFS_INEW);
287 ASSERT(ip->i_cluster == NULL);
290 spin_lock_init(&new_icl->icl_lock);
291 INIT_HLIST_HEAD(&new_icl->icl_inodes);
295 ASSERT(!hlist_empty(&icl->icl_inodes));
297 spin_lock(&icl->icl_lock);
298 hlist_add_head(&ip->i_cnode, &icl->icl_inodes);
300 spin_unlock(&icl->icl_lock);
302 write_unlock(&pag->pag_ici_lock);
303 radix_tree_preload_end();
305 kmem_zone_free(xfs_icluster_zone, new_icl);
308 * Link ip to its mount and thread it on the mount's inode list.
311 if ((iq = mp->m_inodes)) {
312 ASSERT(iq->i_mprev->i_mnext == iq);
313 ip->i_mprev = iq->i_mprev;
314 iq->i_mprev->i_mnext = ip;
323 XFS_MOUNT_IUNLOCK(mp);
324 xfs_put_perag(mp, pag);
327 ASSERT(ip->i_df.if_ext_max ==
328 XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
330 xfs_iflags_set(ip, XFS_IMODIFIED);
334 * If we have a real type for an on-disk inode, we can set ops(&unlock)
335 * now. If it's a new inode being created, xfs_ialloc will handle it.
337 xfs_initialize_vnode(mp, vp, ip);
343 * The 'normal' internal xfs_iget, if needed it will
344 * 'allocate', or 'get', the vnode.
357 bhv_vnode_t *vp = NULL;
360 XFS_STATS_INC(xs_ig_attempts);
363 inode = iget_locked(mp->m_super, ino);
367 vp = vn_from_inode(inode);
368 if (inode->i_state & I_NEW) {
369 vn_initialize(inode);
370 error = xfs_iget_core(vp, mp, tp, ino, flags,
371 lock_flags, ipp, bno);
374 if (inode->i_state & I_NEW)
375 unlock_new_inode(inode);
380 * If the inode is not fully constructed due to
381 * filehandle mismatches wait for the inode to go
382 * away and try again.
384 * iget_locked will call __wait_on_freeing_inode
385 * to wait for the inode to go away.
387 if (is_bad_inode(inode) ||
388 ((ip = xfs_vtoi(vp)) == NULL)) {
395 xfs_ilock(ip, lock_flags);
396 XFS_STATS_INC(xs_ig_found);
401 error = ENOMEM; /* If we got no inode we are out of memory */
407 * Do the setup for the various locks within the incore inode.
414 mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
415 "xfsino", ip->i_ino);
416 mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
417 init_waitqueue_head(&ip->i_ipin_wait);
418 atomic_set(&ip->i_pincount, 0);
419 initnsema(&ip->i_flock, 1, "xfsfino");
423 * Look for the inode corresponding to the given ino in the hash table.
424 * If it is there and its i_transp pointer matches tp, return it.
425 * Otherwise, return NULL.
428 xfs_inode_incore(xfs_mount_t *mp,
435 pag = xfs_get_perag(mp, ino);
436 read_lock(&pag->pag_ici_lock);
437 ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ino));
438 read_unlock(&pag->pag_ici_lock);
439 xfs_put_perag(mp, pag);
441 /* the returned inode must match the transaction */
442 if (ip && (ip->i_transp != tp))
448 * Decrement reference count of an inode structure and unlock it.
450 * ip -- the inode being released
451 * lock_flags -- this parameter indicates the inode's locks to be
452 * to be released. See the comment on xfs_iunlock() for a list
456 xfs_iput(xfs_inode_t *ip,
459 bhv_vnode_t *vp = XFS_ITOV(ip);
461 xfs_itrace_entry(ip);
462 xfs_iunlock(ip, lock_flags);
467 * Special iput for brand-new inodes that are still locked
470 xfs_iput_new(xfs_inode_t *ip,
473 bhv_vnode_t *vp = XFS_ITOV(ip);
474 struct inode *inode = vn_to_inode(vp);
476 xfs_itrace_entry(ip);
478 if ((ip->i_d.di_mode == 0)) {
479 ASSERT(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
482 if (inode->i_state & I_NEW)
483 unlock_new_inode(inode);
485 xfs_iunlock(ip, lock_flags);
491 * This routine embodies the part of the reclaim code that pulls
492 * the inode from the inode hash table and the mount structure's
494 * This should only be called from xfs_reclaim().
497 xfs_ireclaim(xfs_inode_t *ip)
502 * Remove from old hash list and mount list.
504 XFS_STATS_INC(xs_ig_reclaims);
509 * Here we do a spurious inode lock in order to coordinate with
510 * xfs_sync(). This is because xfs_sync() references the inodes
511 * in the mount list without taking references on the corresponding
512 * vnodes. We make that OK here by ensuring that we wait until
513 * the inode is unlocked in xfs_sync() before we go ahead and
514 * free it. We get both the regular lock and the io lock because
515 * the xfs_sync() code may need to drop the regular one but will
516 * still hold the io lock.
518 xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
521 * Release dquots (and their references) if any. An inode may escape
522 * xfs_inactive and get here via vn_alloc->vn_reclaim path.
524 XFS_QM_DQDETACH(ip->i_mount, ip);
527 * Pull our behavior descriptor from the vnode chain.
529 vp = XFS_ITOV_NULL(ip);
531 vn_to_inode(vp)->i_private = NULL;
536 * Free all memory associated with the inode.
538 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
543 * This routine removes an about-to-be-destroyed inode from
544 * all of the lists in which it is located with the exception
545 * of the behavior chain.
551 xfs_mount_t *mp = ip->i_mount;
552 xfs_perag_t *pag = xfs_get_perag(mp, ip->i_ino);
555 write_lock(&pag->pag_ici_lock);
556 radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino));
557 write_unlock(&pag->pag_ici_lock);
558 xfs_put_perag(mp, pag);
561 * Remove from cluster list
564 spin_lock(&ip->i_cluster->icl_lock);
565 hlist_del(&ip->i_cnode);
566 spin_unlock(&ip->i_cluster->icl_lock);
568 /* was last inode in cluster? */
569 if (hlist_empty(&ip->i_cluster->icl_inodes))
570 kmem_zone_free(xfs_icluster_zone, ip->i_cluster);
573 * Remove from mount's inode list.
576 ASSERT((ip->i_mnext != NULL) && (ip->i_mprev != NULL));
578 iq->i_mprev = ip->i_mprev;
579 ip->i_mprev->i_mnext = iq;
582 * Fix up the head pointer if it points to the inode being deleted.
584 if (mp->m_inodes == ip) {
592 /* Deal with the deleted inodes list */
593 list_del_init(&ip->i_reclaim);
596 XFS_MOUNT_IUNLOCK(mp);
600 * This is a wrapper routine around the xfs_ilock() routine
601 * used to centralize some grungy code. It is used in places
602 * that wish to lock the inode solely for reading the extents.
603 * The reason these places can't just call xfs_ilock(SHARED)
604 * is that the inode lock also guards to bringing in of the
605 * extents from disk for a file in b-tree format. If the inode
606 * is in b-tree format, then we need to lock the inode exclusively
607 * until the extents are read in. Locking it exclusively all
608 * the time would limit our parallelism unnecessarily, though.
609 * What we do instead is check to see if the extents have been
610 * read in yet, and only lock the inode exclusively if they
613 * The function returns a value which should be given to the
614 * corresponding xfs_iunlock_map_shared(). This value is
615 * the mode in which the lock was actually taken.
618 xfs_ilock_map_shared(
623 if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
624 ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
625 lock_mode = XFS_ILOCK_EXCL;
627 lock_mode = XFS_ILOCK_SHARED;
630 xfs_ilock(ip, lock_mode);
636 * This is simply the unlock routine to go with xfs_ilock_map_shared().
637 * All it does is call xfs_iunlock() with the given lock_mode.
640 xfs_iunlock_map_shared(
642 unsigned int lock_mode)
644 xfs_iunlock(ip, lock_mode);
648 * The xfs inode contains 2 locks: a multi-reader lock called the
649 * i_iolock and a multi-reader lock called the i_lock. This routine
650 * allows either or both of the locks to be obtained.
652 * The 2 locks should always be ordered so that the IO lock is
653 * obtained first in order to prevent deadlock.
655 * ip -- the inode being locked
656 * lock_flags -- this parameter indicates the inode's locks
657 * to be locked. It can be:
662 * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
663 * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
664 * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
665 * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
668 xfs_ilock(xfs_inode_t *ip,
672 * You can't set both SHARED and EXCL for the same lock,
673 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
674 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
676 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
677 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
678 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
679 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
680 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
682 if (lock_flags & XFS_IOLOCK_EXCL) {
683 mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
684 } else if (lock_flags & XFS_IOLOCK_SHARED) {
685 mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
687 if (lock_flags & XFS_ILOCK_EXCL) {
688 mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
689 } else if (lock_flags & XFS_ILOCK_SHARED) {
690 mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
692 xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address);
696 * This is just like xfs_ilock(), except that the caller
697 * is guaranteed not to sleep. It returns 1 if it gets
698 * the requested locks and 0 otherwise. If the IO lock is
699 * obtained but the inode lock cannot be, then the IO lock
700 * is dropped before returning.
702 * ip -- the inode being locked
703 * lock_flags -- this parameter indicates the inode's locks to be
704 * to be locked. See the comment for xfs_ilock() for a list
709 xfs_ilock_nowait(xfs_inode_t *ip,
716 * You can't set both SHARED and EXCL for the same lock,
717 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
718 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
720 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
721 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
722 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
723 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
724 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
727 if (lock_flags & XFS_IOLOCK_EXCL) {
728 iolocked = mrtryupdate(&ip->i_iolock);
732 } else if (lock_flags & XFS_IOLOCK_SHARED) {
733 iolocked = mrtryaccess(&ip->i_iolock);
738 if (lock_flags & XFS_ILOCK_EXCL) {
739 ilocked = mrtryupdate(&ip->i_lock);
742 mrunlock(&ip->i_iolock);
746 } else if (lock_flags & XFS_ILOCK_SHARED) {
747 ilocked = mrtryaccess(&ip->i_lock);
750 mrunlock(&ip->i_iolock);
755 xfs_ilock_trace(ip, 2, lock_flags, (inst_t *)__return_address);
760 * xfs_iunlock() is used to drop the inode locks acquired with
761 * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
762 * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
763 * that we know which locks to drop.
765 * ip -- the inode being unlocked
766 * lock_flags -- this parameter indicates the inode's locks to be
767 * to be unlocked. See the comment for xfs_ilock() for a list
768 * of valid values for this parameter.
772 xfs_iunlock(xfs_inode_t *ip,
776 * You can't set both SHARED and EXCL for the same lock,
777 * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
778 * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
780 ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
781 (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
782 ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
783 (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
784 ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
785 XFS_LOCK_DEP_MASK)) == 0);
786 ASSERT(lock_flags != 0);
788 if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
789 ASSERT(!(lock_flags & XFS_IOLOCK_SHARED) ||
790 (ismrlocked(&ip->i_iolock, MR_ACCESS)));
791 ASSERT(!(lock_flags & XFS_IOLOCK_EXCL) ||
792 (ismrlocked(&ip->i_iolock, MR_UPDATE)));
793 mrunlock(&ip->i_iolock);
796 if (lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) {
797 ASSERT(!(lock_flags & XFS_ILOCK_SHARED) ||
798 (ismrlocked(&ip->i_lock, MR_ACCESS)));
799 ASSERT(!(lock_flags & XFS_ILOCK_EXCL) ||
800 (ismrlocked(&ip->i_lock, MR_UPDATE)));
801 mrunlock(&ip->i_lock);
804 * Let the AIL know that this item has been unlocked in case
805 * it is in the AIL and anyone is waiting on it. Don't do
806 * this if the caller has asked us not to.
808 if (!(lock_flags & XFS_IUNLOCK_NONOTIFY) &&
809 ip->i_itemp != NULL) {
810 xfs_trans_unlocked_item(ip->i_mount,
811 (xfs_log_item_t*)(ip->i_itemp));
814 xfs_ilock_trace(ip, 3, lock_flags, (inst_t *)__return_address);
818 * give up write locks. the i/o lock cannot be held nested
819 * if it is being demoted.
822 xfs_ilock_demote(xfs_inode_t *ip,
825 ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
826 ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
828 if (lock_flags & XFS_ILOCK_EXCL) {
829 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
830 mrdemote(&ip->i_lock);
832 if (lock_flags & XFS_IOLOCK_EXCL) {
833 ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
834 mrdemote(&ip->i_iolock);
839 * The following three routines simply manage the i_flock
840 * semaphore embedded in the inode. This semaphore synchronizes
841 * processes attempting to flush the in-core inode back to disk.
844 xfs_iflock(xfs_inode_t *ip)
846 psema(&(ip->i_flock), PINOD|PLTWAIT);
850 xfs_iflock_nowait(xfs_inode_t *ip)
852 return (cpsema(&(ip->i_flock)));
856 xfs_ifunlock(xfs_inode_t *ip)
858 ASSERT(issemalocked(&(ip->i_flock)));
859 vsema(&(ip->i_flock));