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-rw-r--r--fs/xfs/xfs_iget.c831
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diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
deleted file mode 100644
index 8e09b71f410..00000000000
--- a/fs/xfs/xfs_iget.c
+++ /dev/null
@@ -1,831 +0,0 @@
-/*
- * Copyright (c) 2000-2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it would be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#include "xfs.h"
-#include "xfs_fs.h"
-#include "xfs_types.h"
-#include "xfs_bit.h"
-#include "xfs_log.h"
-#include "xfs_inum.h"
-#include "xfs_trans.h"
-#include "xfs_sb.h"
-#include "xfs_ag.h"
-#include "xfs_dir2.h"
-#include "xfs_dmapi.h"
-#include "xfs_mount.h"
-#include "xfs_bmap_btree.h"
-#include "xfs_alloc_btree.h"
-#include "xfs_ialloc_btree.h"
-#include "xfs_dir2_sf.h"
-#include "xfs_attr_sf.h"
-#include "xfs_dinode.h"
-#include "xfs_inode.h"
-#include "xfs_btree.h"
-#include "xfs_ialloc.h"
-#include "xfs_quota.h"
-#include "xfs_utils.h"
-
-/*
- * Look up an inode by number in the given file system.
- * The inode is looked up in the cache held in each AG.
- * If the inode is found in the cache, attach it to the provided
- * vnode.
- *
- * If it is not in core, read it in from the file system's device,
- * add it to the cache and attach the provided vnode.
- *
- * The inode is locked according to the value of the lock_flags parameter.
- * This flag parameter indicates how and if the inode's IO lock and inode lock
- * should be taken.
- *
- * mp -- the mount point structure for the current file system. It points
- * to the inode hash table.
- * tp -- a pointer to the current transaction if there is one. This is
- * simply passed through to the xfs_iread() call.
- * ino -- the number of the inode desired. This is the unique identifier
- * within the file system for the inode being requested.
- * lock_flags -- flags indicating how to lock the inode. See the comment
- * for xfs_ilock() for a list of valid values.
- * bno -- the block number starting the buffer containing the inode,
- * if known (as by bulkstat), else 0.
- */
-STATIC int
-xfs_iget_core(
- struct inode *inode,
- xfs_mount_t *mp,
- xfs_trans_t *tp,
- xfs_ino_t ino,
- uint flags,
- uint lock_flags,
- xfs_inode_t **ipp,
- xfs_daddr_t bno)
-{
- struct inode *old_inode;
- xfs_inode_t *ip;
- xfs_inode_t *iq;
- int error;
- xfs_icluster_t *icl, *new_icl = NULL;
- unsigned long first_index, mask;
- xfs_perag_t *pag;
- xfs_agino_t agino;
-
- /* the radix tree exists only in inode capable AGs */
- if (XFS_INO_TO_AGNO(mp, ino) >= mp->m_maxagi)
- return EINVAL;
-
- /* get the perag structure and ensure that it's inode capable */
- pag = xfs_get_perag(mp, ino);
- if (!pag->pagi_inodeok)
- return EINVAL;
- ASSERT(pag->pag_ici_init);
- agino = XFS_INO_TO_AGINO(mp, ino);
-
-again:
- read_lock(&pag->pag_ici_lock);
- ip = radix_tree_lookup(&pag->pag_ici_root, agino);
-
- if (ip != NULL) {
- /*
- * If INEW is set this inode is being set up
- * we need to pause and try again.
- */
- if (xfs_iflags_test(ip, XFS_INEW)) {
- read_unlock(&pag->pag_ici_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
-
- old_inode = ip->i_vnode;
- if (old_inode == NULL) {
- /*
- * If IRECLAIM is set this inode is
- * on its way out of the system,
- * we need to pause and try again.
- */
- if (xfs_iflags_test(ip, XFS_IRECLAIM)) {
- read_unlock(&pag->pag_ici_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
- ASSERT(xfs_iflags_test(ip, XFS_IRECLAIMABLE));
-
- /*
- * If lookup is racing with unlink, then we
- * should return an error immediately so we
- * don't remove it from the reclaim list and
- * potentially leak the inode.
- */
- if ((ip->i_d.di_mode == 0) &&
- !(flags & XFS_IGET_CREATE)) {
- read_unlock(&pag->pag_ici_lock);
- xfs_put_perag(mp, pag);
- return ENOENT;
- }
-
- xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
-
- XFS_STATS_INC(xs_ig_found);
- xfs_iflags_clear(ip, XFS_IRECLAIMABLE);
- read_unlock(&pag->pag_ici_lock);
-
- XFS_MOUNT_ILOCK(mp);
- list_del_init(&ip->i_reclaim);
- XFS_MOUNT_IUNLOCK(mp);
-
- goto finish_inode;
-
- } else if (inode != old_inode) {
- /* The inode is being torn down, pause and
- * try again.
- */
- if (old_inode->i_state & (I_FREEING | I_CLEAR)) {
- read_unlock(&pag->pag_ici_lock);
- delay(1);
- XFS_STATS_INC(xs_ig_frecycle);
-
- goto again;
- }
-/* Chances are the other vnode (the one in the inode) is being torn
-* down right now, and we landed on top of it. Question is, what do
-* we do? Unhook the old inode and hook up the new one?
-*/
- cmn_err(CE_PANIC,
- "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p",
- old_inode, inode);
- }
-
- /*
- * Inode cache hit
- */
- read_unlock(&pag->pag_ici_lock);
- XFS_STATS_INC(xs_ig_found);
-
-finish_inode:
- if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
- xfs_put_perag(mp, pag);
- return ENOENT;
- }
-
- if (lock_flags != 0)
- xfs_ilock(ip, lock_flags);
-
- xfs_iflags_clear(ip, XFS_ISTALE);
- xfs_itrace_exit_tag(ip, "xfs_iget.found");
- goto return_ip;
- }
-
- /*
- * Inode cache miss
- */
- read_unlock(&pag->pag_ici_lock);
- XFS_STATS_INC(xs_ig_missed);
-
- /*
- * Read the disk inode attributes into a new inode structure and get
- * a new vnode for it. This should also initialize i_ino and i_mount.
- */
- error = xfs_iread(mp, tp, ino, &ip, bno,
- (flags & XFS_IGET_BULKSTAT) ? XFS_IMAP_BULKSTAT : 0);
- if (error) {
- xfs_put_perag(mp, pag);
- return error;
- }
-
- xfs_itrace_exit_tag(ip, "xfs_iget.alloc");
-
-
- mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER,
- "xfsino", ip->i_ino);
- mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
- init_waitqueue_head(&ip->i_ipin_wait);
- atomic_set(&ip->i_pincount, 0);
- initnsema(&ip->i_flock, 1, "xfsfino");
-
- if (lock_flags)
- xfs_ilock(ip, lock_flags);
-
- if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
- xfs_idestroy(ip);
- xfs_put_perag(mp, pag);
- return ENOENT;
- }
-
- /*
- * This is a bit messy - we preallocate everything we _might_
- * need before we pick up the ici lock. That way we don't have to
- * juggle locks and go all the way back to the start.
- */
- new_icl = kmem_zone_alloc(xfs_icluster_zone, KM_SLEEP);
- if (radix_tree_preload(GFP_KERNEL)) {
- xfs_idestroy(ip);
- delay(1);
- goto again;
- }
- mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
- first_index = agino & mask;
- write_lock(&pag->pag_ici_lock);
-
- /*
- * Find the cluster if it exists
- */
- icl = NULL;
- if (radix_tree_gang_lookup(&pag->pag_ici_root, (void**)&iq,
- first_index, 1)) {
- if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) == first_index)
- icl = iq->i_cluster;
- }
-
- /*
- * insert the new inode
- */
- error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
- if (unlikely(error)) {
- BUG_ON(error != -EEXIST);
- write_unlock(&pag->pag_ici_lock);
- radix_tree_preload_end();
- xfs_idestroy(ip);
- XFS_STATS_INC(xs_ig_dup);
- goto again;
- }
-
- /*
- * These values _must_ be set before releasing ihlock!
- */
- ip->i_udquot = ip->i_gdquot = NULL;
- xfs_iflags_set(ip, XFS_INEW);
-
- ASSERT(ip->i_cluster == NULL);
-
- if (!icl) {
- spin_lock_init(&new_icl->icl_lock);
- INIT_HLIST_HEAD(&new_icl->icl_inodes);
- icl = new_icl;
- new_icl = NULL;
- } else {
- ASSERT(!hlist_empty(&icl->icl_inodes));
- }
- spin_lock(&icl->icl_lock);
- hlist_add_head(&ip->i_cnode, &icl->icl_inodes);
- ip->i_cluster = icl;
- spin_unlock(&icl->icl_lock);
-
- write_unlock(&pag->pag_ici_lock);
- radix_tree_preload_end();
- if (new_icl)
- kmem_zone_free(xfs_icluster_zone, new_icl);
-
- /*
- * Link ip to its mount and thread it on the mount's inode list.
- */
- XFS_MOUNT_ILOCK(mp);
- if ((iq = mp->m_inodes)) {
- ASSERT(iq->i_mprev->i_mnext == iq);
- ip->i_mprev = iq->i_mprev;
- iq->i_mprev->i_mnext = ip;
- iq->i_mprev = ip;
- ip->i_mnext = iq;
- } else {
- ip->i_mnext = ip;
- ip->i_mprev = ip;
- }
- mp->m_inodes = ip;
-
- XFS_MOUNT_IUNLOCK(mp);
- xfs_put_perag(mp, pag);
-
- return_ip:
- ASSERT(ip->i_df.if_ext_max ==
- XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
-
- xfs_iflags_set(ip, XFS_IMODIFIED);
- *ipp = ip;
-
- /*
- * If we have a real type for an on-disk inode, we can set ops(&unlock)
- * now. If it's a new inode being created, xfs_ialloc will handle it.
- */
- xfs_initialize_vnode(mp, inode, ip);
- return 0;
-}
-
-
-/*
- * The 'normal' internal xfs_iget, if needed it will
- * 'allocate', or 'get', the vnode.
- */
-int
-xfs_iget(
- xfs_mount_t *mp,
- xfs_trans_t *tp,
- xfs_ino_t ino,
- uint flags,
- uint lock_flags,
- xfs_inode_t **ipp,
- xfs_daddr_t bno)
-{
- struct inode *inode;
- xfs_inode_t *ip;
- int error;
-
- XFS_STATS_INC(xs_ig_attempts);
-
-retry:
- inode = iget_locked(mp->m_super, ino);
- if (!inode)
- /* If we got no inode we are out of memory */
- return ENOMEM;
-
- if (inode->i_state & I_NEW) {
- XFS_STATS_INC(vn_active);
- XFS_STATS_INC(vn_alloc);
-
- error = xfs_iget_core(inode, mp, tp, ino, flags,
- lock_flags, ipp, bno);
- if (error) {
- make_bad_inode(inode);
- if (inode->i_state & I_NEW)
- unlock_new_inode(inode);
- iput(inode);
- }
- return error;
- }
-
- /*
- * If the inode is not fully constructed due to
- * filehandle mismatches wait for the inode to go
- * away and try again.
- *
- * iget_locked will call __wait_on_freeing_inode
- * to wait for the inode to go away.
- */
- if (is_bad_inode(inode)) {
- iput(inode);
- delay(1);
- goto retry;
- }
-
- ip = XFS_I(inode);
- if (!ip) {
- iput(inode);
- delay(1);
- goto retry;
- }
-
- if (lock_flags != 0)
- xfs_ilock(ip, lock_flags);
- XFS_STATS_INC(xs_ig_found);
- *ipp = ip;
- return 0;
-}
-
-/*
- * Look for the inode corresponding to the given ino in the hash table.
- * If it is there and its i_transp pointer matches tp, return it.
- * Otherwise, return NULL.
- */
-xfs_inode_t *
-xfs_inode_incore(xfs_mount_t *mp,
- xfs_ino_t ino,
- xfs_trans_t *tp)
-{
- xfs_inode_t *ip;
- xfs_perag_t *pag;
-
- pag = xfs_get_perag(mp, ino);
- read_lock(&pag->pag_ici_lock);
- ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ino));
- read_unlock(&pag->pag_ici_lock);
- xfs_put_perag(mp, pag);
-
- /* the returned inode must match the transaction */
- if (ip && (ip->i_transp != tp))
- return NULL;
- return ip;
-}
-
-/*
- * Decrement reference count of an inode structure and unlock it.
- *
- * ip -- the inode being released
- * lock_flags -- this parameter indicates the inode's locks to be
- * to be released. See the comment on xfs_iunlock() for a list
- * of valid values.
- */
-void
-xfs_iput(xfs_inode_t *ip,
- uint lock_flags)
-{
- xfs_itrace_entry(ip);
- xfs_iunlock(ip, lock_flags);
- IRELE(ip);
-}
-
-/*
- * Special iput for brand-new inodes that are still locked
- */
-void
-xfs_iput_new(xfs_inode_t *ip,
- uint lock_flags)
-{
- struct inode *inode = ip->i_vnode;
-
- xfs_itrace_entry(ip);
-
- if ((ip->i_d.di_mode == 0)) {
- ASSERT(!xfs_iflags_test(ip, XFS_IRECLAIMABLE));
- make_bad_inode(inode);
- }
- if (inode->i_state & I_NEW)
- unlock_new_inode(inode);
- if (lock_flags)
- xfs_iunlock(ip, lock_flags);
- IRELE(ip);
-}
-
-
-/*
- * This routine embodies the part of the reclaim code that pulls
- * the inode from the inode hash table and the mount structure's
- * inode list.
- * This should only be called from xfs_reclaim().
- */
-void
-xfs_ireclaim(xfs_inode_t *ip)
-{
- /*
- * Remove from old hash list and mount list.
- */
- XFS_STATS_INC(xs_ig_reclaims);
-
- xfs_iextract(ip);
-
- /*
- * Here we do a spurious inode lock in order to coordinate with
- * xfs_sync(). This is because xfs_sync() references the inodes
- * in the mount list without taking references on the corresponding
- * vnodes. We make that OK here by ensuring that we wait until
- * the inode is unlocked in xfs_sync() before we go ahead and
- * free it. We get both the regular lock and the io lock because
- * the xfs_sync() code may need to drop the regular one but will
- * still hold the io lock.
- */
- xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
-
- /*
- * Release dquots (and their references) if any. An inode may escape
- * xfs_inactive and get here via vn_alloc->vn_reclaim path.
- */
- XFS_QM_DQDETACH(ip->i_mount, ip);
-
- /*
- * Pull our behavior descriptor from the vnode chain.
- */
- if (ip->i_vnode) {
- ip->i_vnode->i_private = NULL;
- ip->i_vnode = NULL;
- }
-
- /*
- * Free all memory associated with the inode.
- */
- xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
- xfs_idestroy(ip);
-}
-
-/*
- * This routine removes an about-to-be-destroyed inode from
- * all of the lists in which it is located with the exception
- * of the behavior chain.
- */
-void
-xfs_iextract(
- xfs_inode_t *ip)
-{
- xfs_mount_t *mp = ip->i_mount;
- xfs_perag_t *pag = xfs_get_perag(mp, ip->i_ino);
- xfs_inode_t *iq;
-
- write_lock(&pag->pag_ici_lock);
- radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino));
- write_unlock(&pag->pag_ici_lock);
- xfs_put_perag(mp, pag);
-
- /*
- * Remove from cluster list
- */
- mp = ip->i_mount;
- spin_lock(&ip->i_cluster->icl_lock);
- hlist_del(&ip->i_cnode);
- spin_unlock(&ip->i_cluster->icl_lock);
-
- /* was last inode in cluster? */
- if (hlist_empty(&ip->i_cluster->icl_inodes))
- kmem_zone_free(xfs_icluster_zone, ip->i_cluster);
-
- /*
- * Remove from mount's inode list.
- */
- XFS_MOUNT_ILOCK(mp);
- ASSERT((ip->i_mnext != NULL) && (ip->i_mprev != NULL));
- iq = ip->i_mnext;
- iq->i_mprev = ip->i_mprev;
- ip->i_mprev->i_mnext = iq;
-
- /*
- * Fix up the head pointer if it points to the inode being deleted.
- */
- if (mp->m_inodes == ip) {
- if (ip == iq) {
- mp->m_inodes = NULL;
- } else {
- mp->m_inodes = iq;
- }
- }
-
- /* Deal with the deleted inodes list */
- list_del_init(&ip->i_reclaim);
-
- mp->m_ireclaims++;
- XFS_MOUNT_IUNLOCK(mp);
-}
-
-/*
- * This is a wrapper routine around the xfs_ilock() routine
- * used to centralize some grungy code. It is used in places
- * that wish to lock the inode solely for reading the extents.
- * The reason these places can't just call xfs_ilock(SHARED)
- * is that the inode lock also guards to bringing in of the
- * extents from disk for a file in b-tree format. If the inode
- * is in b-tree format, then we need to lock the inode exclusively
- * until the extents are read in. Locking it exclusively all
- * the time would limit our parallelism unnecessarily, though.
- * What we do instead is check to see if the extents have been
- * read in yet, and only lock the inode exclusively if they
- * have not.
- *
- * The function returns a value which should be given to the
- * corresponding xfs_iunlock_map_shared(). This value is
- * the mode in which the lock was actually taken.
- */
-uint
-xfs_ilock_map_shared(
- xfs_inode_t *ip)
-{
- uint lock_mode;
-
- if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) &&
- ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) {
- lock_mode = XFS_ILOCK_EXCL;
- } else {
- lock_mode = XFS_ILOCK_SHARED;
- }
-
- xfs_ilock(ip, lock_mode);
-
- return lock_mode;
-}
-
-/*
- * This is simply the unlock routine to go with xfs_ilock_map_shared().
- * All it does is call xfs_iunlock() with the given lock_mode.
- */
-void
-xfs_iunlock_map_shared(
- xfs_inode_t *ip,
- unsigned int lock_mode)
-{
- xfs_iunlock(ip, lock_mode);
-}
-
-/*
- * The xfs inode contains 2 locks: a multi-reader lock called the
- * i_iolock and a multi-reader lock called the i_lock. This routine
- * allows either or both of the locks to be obtained.
- *
- * The 2 locks should always be ordered so that the IO lock is
- * obtained first in order to prevent deadlock.
- *
- * ip -- the inode being locked
- * lock_flags -- this parameter indicates the inode's locks
- * to be locked. It can be:
- * XFS_IOLOCK_SHARED,
- * XFS_IOLOCK_EXCL,
- * XFS_ILOCK_SHARED,
- * XFS_ILOCK_EXCL,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED,
- * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL
- */
-void
-xfs_ilock(xfs_inode_t *ip,
- uint lock_flags)
-{
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- if (lock_flags & XFS_IOLOCK_EXCL) {
- mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- } else if (lock_flags & XFS_IOLOCK_SHARED) {
- mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags));
- }
- if (lock_flags & XFS_ILOCK_EXCL) {
- mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
- } else if (lock_flags & XFS_ILOCK_SHARED) {
- mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
- }
- xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address);
-}
-
-/*
- * This is just like xfs_ilock(), except that the caller
- * is guaranteed not to sleep. It returns 1 if it gets
- * the requested locks and 0 otherwise. If the IO lock is
- * obtained but the inode lock cannot be, then the IO lock
- * is dropped before returning.
- *
- * ip -- the inode being locked
- * lock_flags -- this parameter indicates the inode's locks to be
- * to be locked. See the comment for xfs_ilock() for a list
- * of valid values.
- *
- */
-int
-xfs_ilock_nowait(xfs_inode_t *ip,
- uint lock_flags)
-{
- int iolocked;
- int ilocked;
-
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0);
-
- iolocked = 0;
- if (lock_flags & XFS_IOLOCK_EXCL) {
- iolocked = mrtryupdate(&ip->i_iolock);
- if (!iolocked) {
- return 0;
- }
- } else if (lock_flags & XFS_IOLOCK_SHARED) {
- iolocked = mrtryaccess(&ip->i_iolock);
- if (!iolocked) {
- return 0;
- }
- }
- if (lock_flags & XFS_ILOCK_EXCL) {
- ilocked = mrtryupdate(&ip->i_lock);
- if (!ilocked) {
- if (iolocked) {
- mrunlock(&ip->i_iolock);
- }
- return 0;
- }
- } else if (lock_flags & XFS_ILOCK_SHARED) {
- ilocked = mrtryaccess(&ip->i_lock);
- if (!ilocked) {
- if (iolocked) {
- mrunlock(&ip->i_iolock);
- }
- return 0;
- }
- }
- xfs_ilock_trace(ip, 2, lock_flags, (inst_t *)__return_address);
- return 1;
-}
-
-/*
- * xfs_iunlock() is used to drop the inode locks acquired with
- * xfs_ilock() and xfs_ilock_nowait(). The caller must pass
- * in the flags given to xfs_ilock() or xfs_ilock_nowait() so
- * that we know which locks to drop.
- *
- * ip -- the inode being unlocked
- * lock_flags -- this parameter indicates the inode's locks to be
- * to be unlocked. See the comment for xfs_ilock() for a list
- * of valid values for this parameter.
- *
- */
-void
-xfs_iunlock(xfs_inode_t *ip,
- uint lock_flags)
-{
- /*
- * You can't set both SHARED and EXCL for the same lock,
- * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED,
- * and XFS_ILOCK_EXCL are valid values to set in lock_flags.
- */
- ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
- (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
- ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
- (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY |
- XFS_LOCK_DEP_MASK)) == 0);
- ASSERT(lock_flags != 0);
-
- if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) {
- ASSERT(!(lock_flags & XFS_IOLOCK_SHARED) ||
- (ismrlocked(&ip->i_iolock, MR_ACCESS)));
- ASSERT(!(lock_flags & XFS_IOLOCK_EXCL) ||
- (ismrlocked(&ip->i_iolock, MR_UPDATE)));
- mrunlock(&ip->i_iolock);
- }
-
- if (lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) {
- ASSERT(!(lock_flags & XFS_ILOCK_SHARED) ||
- (ismrlocked(&ip->i_lock, MR_ACCESS)));
- ASSERT(!(lock_flags & XFS_ILOCK_EXCL) ||
- (ismrlocked(&ip->i_lock, MR_UPDATE)));
- mrunlock(&ip->i_lock);
-
- /*
- * Let the AIL know that this item has been unlocked in case
- * it is in the AIL and anyone is waiting on it. Don't do
- * this if the caller has asked us not to.
- */
- if (!(lock_flags & XFS_IUNLOCK_NONOTIFY) &&
- ip->i_itemp != NULL) {
- xfs_trans_unlocked_item(ip->i_mount,
- (xfs_log_item_t*)(ip->i_itemp));
- }
- }
- xfs_ilock_trace(ip, 3, lock_flags, (inst_t *)__return_address);
-}
-
-/*
- * give up write locks. the i/o lock cannot be held nested
- * if it is being demoted.
- */
-void
-xfs_ilock_demote(xfs_inode_t *ip,
- uint lock_flags)
-{
- ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL));
- ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
-
- if (lock_flags & XFS_ILOCK_EXCL) {
- ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE));
- mrdemote(&ip->i_lock);
- }
- if (lock_flags & XFS_IOLOCK_EXCL) {
- ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE));
- mrdemote(&ip->i_iolock);
- }
-}
-
-/*
- * The following three routines simply manage the i_flock
- * semaphore embedded in the inode. This semaphore synchronizes
- * processes attempting to flush the in-core inode back to disk.
- */
-void
-xfs_iflock(xfs_inode_t *ip)
-{
- psema(&(ip->i_flock), PINOD|PLTWAIT);
-}
-
-int
-xfs_iflock_nowait(xfs_inode_t *ip)
-{
- return (cpsema(&(ip->i_flock)));
-}
-
-void
-xfs_ifunlock(xfs_inode_t *ip)
-{
- ASSERT(issemalocked(&(ip->i_flock)));
- vsema(&(ip->i_flock));
-}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 05:30:04 +0000