xfs: don't block inode reclaim on the ILOCK

When we attempt to reclaim an inode, the first thing we do is take
the inode lock. This is blocking right now, so if the inode being
accessed by something else (e.g. being flushed to the cluster
buffer) we will block here.

Change this to a trylock so that we do not block inode reclaim
unnecessarily here.

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

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 592eab2..f387ec2 100644 (file)
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1119,9 +1119,10 @@ xfs_reclaim_inode(
 {
        xfs_ino_t               ino = ip->i_ino; /* for radix_tree_delete */
 
-       xfs_ilock(ip, XFS_ILOCK_EXCL);
-       if (!xfs_iflock_nowait(ip))
+       if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
                goto out;
+       if (!xfs_iflock_nowait(ip))
+               goto out_iunlock;
 
        if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
                xfs_iunpin_wait(ip);
@@ -1188,8 +1189,9 @@ reclaim:
 
 out_ifunlock:
        xfs_ifunlock(ip);
-out:
+out_iunlock:
        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+out:
        xfs_iflags_clear(ip, XFS_IRECLAIM);
        return false;
 }