Added missing tegra files.HEADmaster

1 files changed, 720 insertions, 0 deletions

diff --git a/fs/xfs/xfs_iget.c b/fs/xfs/xfs_iget.c
new file mode 100644
index 00000000000..7759812c1bb
--- /dev/null
+++ b/fs/xfs/xfs_iget.c
@@ -0,0 +1,720 @@
+/*
+ * 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_acl.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_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.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"
+#include "xfs_trans_priv.h"
+#include "xfs_inode_item.h"
+#include "xfs_bmap.h"
+#include "xfs_trace.h"
+
+
+/*
+ * Define xfs inode iolock lockdep classes. We need to ensure that all active
+ * inodes are considered the same for lockdep purposes, including inodes that
+ * are recycled through the XFS_IRECLAIMABLE state. This is the the only way to
+ * guarantee the locks are considered the same when there are multiple lock
+ * initialisation siteѕ. Also, define a reclaimable inode class so it is
+ * obvious in lockdep reports which class the report is against.
+ */
+static struct lock_class_key xfs_iolock_active;
+struct lock_class_key xfs_iolock_reclaimable;
+
+/*
+ * Allocate and initialise an xfs_inode.
+ */
+STATIC struct xfs_inode *
+xfs_inode_alloc(
+        struct xfs_mount        *mp,
+        xfs_ino_t               ino)
+{
+        struct xfs_inode        *ip;
+
+        /*
+         * if this didn't occur in transactions, we could use
+         * KM_MAYFAIL and return NULL here on ENOMEM. Set the
+         * code up to do this anyway.
+         */
+        ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP);
+        if (!ip)
+                return NULL;
+        if (inode_init_always(mp->m_super, VFS_I(ip))) {
+                kmem_zone_free(xfs_inode_zone, ip);
+                return NULL;
+        }
+
+        ASSERT(atomic_read(&ip->i_iocount) == 0);
+        ASSERT(atomic_read(&ip->i_pincount) == 0);
+        ASSERT(!spin_is_locked(&ip->i_flags_lock));
+        ASSERT(completion_done(&ip->i_flush));
+        ASSERT(ip->i_ino == 0);
+
+        mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+        lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+                        &xfs_iolock_active, "xfs_iolock_active");
+
+        /* initialise the xfs inode */
+        ip->i_ino = ino;
+        ip->i_mount = mp;
+        memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
+        ip->i_afp = NULL;
+        memset(&ip->i_df, 0, sizeof(xfs_ifork_t));
+        ip->i_flags = 0;
+        ip->i_update_core = 0;
+        ip->i_delayed_blks = 0;
+        memset(&ip->i_d, 0, sizeof(xfs_icdinode_t));
+        ip->i_size = 0;
+        ip->i_new_size = 0;
+
+        return ip;
+}
+
+STATIC void
+xfs_inode_free_callback(
+        struct rcu_head         *head)
+{
+        struct inode            *inode = container_of(head, struct inode, i_rcu);
+        struct xfs_inode        *ip = XFS_I(inode);
+
+        INIT_LIST_HEAD(&inode->i_dentry);
+        kmem_zone_free(xfs_inode_zone, ip);
+}
+
+void
+xfs_inode_free(
+        struct xfs_inode        *ip)
+{
+        switch (ip->i_d.di_mode & S_IFMT) {
+        case S_IFREG:
+        case S_IFDIR:
+        case S_IFLNK:
+                xfs_idestroy_fork(ip, XFS_DATA_FORK);
+                break;
+        }
+
+        if (ip->i_afp)
+                xfs_idestroy_fork(ip, XFS_ATTR_FORK);
+
+        if (ip->i_itemp) {
+                /*
+                 * Only if we are shutting down the fs will we see an
+                 * inode still in the AIL. If it is there, we should remove
+                 * it to prevent a use-after-free from occurring.
+                 */
+                xfs_log_item_t  *lip = &ip->i_itemp->ili_item;
+                struct xfs_ail  *ailp = lip->li_ailp;
+
+                ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) ||
+                                       XFS_FORCED_SHUTDOWN(ip->i_mount));
+                if (lip->li_flags & XFS_LI_IN_AIL) {
+                        spin_lock(&ailp->xa_lock);
+                        if (lip->li_flags & XFS_LI_IN_AIL)
+                                xfs_trans_ail_delete(ailp, lip);
+                        else
+                                spin_unlock(&ailp->xa_lock);
+                }
+                xfs_inode_item_destroy(ip);
+                ip->i_itemp = NULL;
+        }
+
+        /* asserts to verify all state is correct here */
+        ASSERT(atomic_read(&ip->i_iocount) == 0);
+        ASSERT(atomic_read(&ip->i_pincount) == 0);
+        ASSERT(!spin_is_locked(&ip->i_flags_lock));
+        ASSERT(completion_done(&ip->i_flush));
+
+        /*
+         * Because we use RCU freeing we need to ensure the inode always
+         * appears to be reclaimed with an invalid inode number when in the
+         * free state. The ip->i_flags_lock provides the barrier against lookup
+         * races.
+         */
+        spin_lock(&ip->i_flags_lock);
+        ip->i_flags = XFS_IRECLAIM;
+        ip->i_ino = 0;
+        spin_unlock(&ip->i_flags_lock);
+
+        call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
+}
+
+/*
+ * Check the validity of the inode we just found it the cache
+ */
+static int
+xfs_iget_cache_hit(
+        struct xfs_perag        *pag,
+        struct xfs_inode        *ip,
+        xfs_ino_t               ino,
+        int                     flags,
+        int                     lock_flags) __releases(RCU)
+{
+        struct inode            *inode = VFS_I(ip);
+        struct xfs_mount        *mp = ip->i_mount;
+        int                     error;
+
+        /*
+         * check for re-use of an inode within an RCU grace period due to the
+         * radix tree nodes not being updated yet. We monitor for this by
+         * setting the inode number to zero before freeing the inode structure.
+         * If the inode has been reallocated and set up, then the inode number
+         * will not match, so check for that, too.
+         */
+        spin_lock(&ip->i_flags_lock);
+        if (ip->i_ino != ino) {
+                trace_xfs_iget_skip(ip);
+                XFS_STATS_INC(xs_ig_frecycle);
+                error = EAGAIN;
+                goto out_error;
+        }
+
+
+        /*
+         * If we are racing with another cache hit that is currently
+         * instantiating this inode or currently recycling it out of
+         * reclaimabe state, wait for the initialisation to complete
+         * before continuing.
+         *
+         * XXX(hch): eventually we should do something equivalent to
+         *           wait_on_inode to wait for these flags to be cleared
+         *           instead of polling for it.
+         */
+        if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
+                trace_xfs_iget_skip(ip);
+                XFS_STATS_INC(xs_ig_frecycle);
+                error = EAGAIN;
+                goto out_error;
+        }
+
+        /*
+         * If lookup is racing with unlink return an error immediately.
+         */
+        if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) {
+                error = ENOENT;
+                goto out_error;
+        }
+
+        /*
+         * If IRECLAIMABLE is set, we've torn down the VFS inode already.
+         * Need to carefully get it back into useable state.
+         */
+        if (ip->i_flags & XFS_IRECLAIMABLE) {
+                trace_xfs_iget_reclaim(ip);
+
+                /*
+                 * We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode
+                 * from stomping over us while we recycle the inode.  We can't
+                 * clear the radix tree reclaimable tag yet as it requires
+                 * pag_ici_lock to be held exclusive.
+                 */
+                ip->i_flags |= XFS_IRECLAIM;
+
+                spin_unlock(&ip->i_flags_lock);
+                rcu_read_unlock();
+
+                error = -inode_init_always(mp->m_super, inode);
+                if (error) {
+                        /*
+                         * Re-initializing the inode failed, and we are in deep
+                         * trouble.  Try to re-add it to the reclaim list.
+                         */
+                        rcu_read_lock();
+                        spin_lock(&ip->i_flags_lock);
+
+                        ip->i_flags &= ~(XFS_INEW | XFS_IRECLAIM);
+                        ASSERT(ip->i_flags & XFS_IRECLAIMABLE);
+                        trace_xfs_iget_reclaim_fail(ip);
+                        goto out_error;
+                }
+
+                spin_lock(&pag->pag_ici_lock);
+                spin_lock(&ip->i_flags_lock);
+
+                /*
+                 * Clear the per-lifetime state in the inode as we are now
+                 * effectively a new inode and need to return to the initial
+                 * state before reuse occurs.
+                 */
+                ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS;
+                ip->i_flags |= XFS_INEW;
+                __xfs_inode_clear_reclaim_tag(mp, pag, ip);
+                inode->i_state = I_NEW;
+
+                ASSERT(!rwsem_is_locked(&ip->i_iolock.mr_lock));
+                mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino);
+                lockdep_set_class_and_name(&ip->i_iolock.mr_lock,
+                                &xfs_iolock_active, "xfs_iolock_active");
+
+                spin_unlock(&ip->i_flags_lock);
+                spin_unlock(&pag->pag_ici_lock);
+        } else {
+                /* If the VFS inode is being torn down, pause and try again. */
+                if (!igrab(inode)) {
+                        trace_xfs_iget_skip(ip);
+                        error = EAGAIN;
+                        goto out_error;
+                }
+
+                /* We've got a live one. */
+                spin_unlock(&ip->i_flags_lock);
+                rcu_read_unlock();
+                trace_xfs_iget_hit(ip);
+        }
+
+        if (lock_flags != 0)
+                xfs_ilock(ip, lock_flags);
+
+        xfs_iflags_clear(ip, XFS_ISTALE);
+        XFS_STATS_INC(xs_ig_found);
+
+        return 0;
+
+out_error:
+        spin_unlock(&ip->i_flags_lock);
+        rcu_read_unlock();
+        return error;
+}
+
+
+static int
+xfs_iget_cache_miss(
+        struct xfs_mount        *mp,
+        struct xfs_perag        *pag,
+        xfs_trans_t             *tp,
+        xfs_ino_t               ino,
+        struct xfs_inode        **ipp,
+        int                     flags,
+        int                     lock_flags)
+{
+        struct xfs_inode        *ip;
+        int                     error;
+        xfs_agino_t             agino = XFS_INO_TO_AGINO(mp, ino);
+
+        ip = xfs_inode_alloc(mp, ino);
+        if (!ip)
+                return ENOMEM;
+
+        error = xfs_iread(mp, tp, ip, flags);
+        if (error)
+                goto out_destroy;
+
+        trace_xfs_iget_miss(ip);
+
+        if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) {
+                error = ENOENT;
+                goto out_destroy;
+        }
+
+        /*
+         * Preload the radix tree so we can insert safely under the
+         * write spinlock. Note that we cannot sleep inside the preload
+         * region.
+         */
+        if (radix_tree_preload(GFP_KERNEL)) {
+                error = EAGAIN;
+                goto out_destroy;
+        }
+
+        /*
+         * Because the inode hasn't been added to the radix-tree yet it can't
+         * be found by another thread, so we can do the non-sleeping lock here.
+         */
+        if (lock_flags) {
+                if (!xfs_ilock_nowait(ip, lock_flags))
+                        BUG();
+        }
+
+        spin_lock(&pag->pag_ici_lock);
+
+        /* insert the new inode */
+        error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
+        if (unlikely(error)) {
+                WARN_ON(error != -EEXIST);
+                XFS_STATS_INC(xs_ig_dup);
+                error = EAGAIN;
+                goto out_preload_end;
+        }
+
+        /* These values _must_ be set before releasing the radix tree lock! */
+        ip->i_udquot = ip->i_gdquot = NULL;
+        xfs_iflags_set(ip, XFS_INEW);
+
+        spin_unlock(&pag->pag_ici_lock);
+        radix_tree_preload_end();
+
+        *ipp = ip;
+        return 0;
+
+out_preload_end:
+        spin_unlock(&pag->pag_ici_lock);
+        radix_tree_preload_end();
+        if (lock_flags)
+                xfs_iunlock(ip, lock_flags);
+out_destroy:
+        __destroy_inode(VFS_I(ip));
+        xfs_inode_free(ip);
+        return error;
+}
+
+/*
+ * 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, initialise the vfs inode
+ * if necessary.
+ *
+ * If it is not in core, read it in from the file system's device,
+ * add it to the cache and initialise the vfs inode.
+ *
+ * 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.
+ */
+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_inode_t     *ip;
+        int             error;
+        xfs_perag_t     *pag;
+        xfs_agino_t     agino;
+
+        /* reject inode numbers outside existing AGs */
+        if (!ino || XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount)
+                return EINVAL;
+
+        /* get the perag structure and ensure that it's inode capable */
+        pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino));
+        agino = XFS_INO_TO_AGINO(mp, ino);
+
+again:
+        error = 0;
+        rcu_read_lock();
+        ip = radix_tree_lookup(&pag->pag_ici_root, agino);
+
+        if (ip) {
+                error = xfs_iget_cache_hit(pag, ip, ino, flags, lock_flags);
+                if (error)
+                        goto out_error_or_again;
+        } else {
+                rcu_read_unlock();
+                XFS_STATS_INC(xs_ig_missed);
+
+                error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip,
+                                                        flags, lock_flags);
+                if (error)
+                        goto out_error_or_again;
+        }
+        xfs_perag_put(pag);
+
+        *ipp = ip;
+
+        ASSERT(ip->i_df.if_ext_max ==
+               XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t));
+        /*
+         * 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.
+         */
+        if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0)
+                xfs_setup_inode(ip);
+        return 0;
+
+out_error_or_again:
+        if (error == EAGAIN) {
+                delay(1);
+                goto again;
+        }
+        xfs_perag_put(pag);
+        return error;
+}
+
+/*
+ * 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));
+
+        trace_xfs_ilock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * 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)
+{
+        /*
+         * 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) {
+                if (!mrtryupdate(&ip->i_iolock))
+                        goto out;
+        } else if (lock_flags & XFS_IOLOCK_SHARED) {
+                if (!mrtryaccess(&ip->i_iolock))
+                        goto out;
+        }
+        if (lock_flags & XFS_ILOCK_EXCL) {
+                if (!mrtryupdate(&ip->i_lock))
+                        goto out_undo_iolock;
+        } else if (lock_flags & XFS_ILOCK_SHARED) {
+                if (!mrtryaccess(&ip->i_lock))
+                        goto out_undo_iolock;
+        }
+        trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
+        return 1;
+
+ out_undo_iolock:
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrunlock_excl(&ip->i_iolock);
+        else if (lock_flags & XFS_IOLOCK_SHARED)
+                mrunlock_shared(&ip->i_iolock);
+ out:
+        return 0;
+}
+
+/*
+ * 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_EXCL)
+                mrunlock_excl(&ip->i_iolock);
+        else if (lock_flags & XFS_IOLOCK_SHARED)
+                mrunlock_shared(&ip->i_iolock);
+
+        if (lock_flags & XFS_ILOCK_EXCL)
+                mrunlock_excl(&ip->i_lock);
+        else if (lock_flags & XFS_ILOCK_SHARED)
+                mrunlock_shared(&ip->i_lock);
+
+        if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) &&
+            !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) {
+                /*
+                 * 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.
+                 */
+                xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp,
+                                        (xfs_log_item_t*)(ip->i_itemp));
+        }
+        trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
+}
+
+/*
+ * 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)
+                mrdemote(&ip->i_lock);
+        if (lock_flags & XFS_IOLOCK_EXCL)
+                mrdemote(&ip->i_iolock);
+
+        trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
+}
+
+#ifdef DEBUG
+int
+xfs_isilocked(
+        xfs_inode_t             *ip,
+        uint                    lock_flags)
+{
+        if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
+                if (!(lock_flags & XFS_ILOCK_SHARED))
+                        return !!ip->i_lock.mr_writer;
+                return rwsem_is_locked(&ip->i_lock.mr_lock);
+        }
+
+        if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
+                if (!(lock_flags & XFS_IOLOCK_SHARED))
+                        return !!ip->i_iolock.mr_writer;
+                return rwsem_is_locked(&ip->i_iolock.mr_lock);
+        }
+
+        ASSERT(0);
+        return 0;
+}
+#endif