xfs: check for cow blocks before trying to clear them

There's no point in allocating a transaction and locking the inode in
preparation to clear cow blocks if there actually are any cow fork
extents.  Therefore, move the xfs_reflink_cancel_cow_range hunk to
xfs_inactive and check the cow ifp first.  This makes inode reclamation
run faster.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 604ee38..50fbbf5 100644 (file)
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1872,6 +1872,7 @@ xfs_inactive(
        xfs_inode_t     *ip)
 {
        struct xfs_mount        *mp;
+       struct xfs_ifork        *cow_ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
        int                     error;
        int                     truncate = 0;
 
@@ -1892,6 +1893,10 @@ xfs_inactive(
        if (mp->m_flags & XFS_MOUNT_RDONLY)
                return;
 
+       /* Try to clean out the cow blocks if there are any. */
+       if (xfs_is_reflink_inode(ip) && cow_ifp->if_bytes > 0)
+               xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
+
        if (VFS_I(ip)->i_nlink != 0) {
                /*
                 * force is true because we are evicting an inode from the

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 45b6f01..951271f 100644 (file)
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -972,7 +972,6 @@ xfs_fs_destroy_inode(
        struct inode            *inode)
 {
        struct xfs_inode        *ip = XFS_I(inode);
-       int                     error;
 
        trace_xfs_destroy_inode(ip);
 
@@ -980,14 +979,6 @@ xfs_fs_destroy_inode(
        XFS_STATS_INC(ip->i_mount, vn_rele);
        XFS_STATS_INC(ip->i_mount, vn_remove);
 
-       if (xfs_is_reflink_inode(ip)) {
-               error = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
-               if (error && !XFS_FORCED_SHUTDOWN(ip->i_mount))
-                       xfs_warn(ip->i_mount,
-"Error %d while evicting CoW blocks for inode %llu.",
-                                       error, ip->i_ino);
-       }
-
        xfs_inactive(ip);
 
        ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) || ip->i_delayed_blks == 0);