[PATCH] xfs: fix inode pincount check in fsync

[Christoph Hellwig]

We need to hold the ilock to check the inode pincount safely.  While
we're at it also remove the check for ip->i_itemp->ili_last_lsn, a
pinned inode always has it set.

Signed-off-by: Christoph Hellwig <hch at lst.de>

Index: xfs/fs/xfs/linux-2.6/xfs_file.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_file.c	2010-02-17 10:46:24.440003402 +0100
+++ xfs/fs/xfs/linux-2.6/xfs_file.c	2010-02-17 10:47:25.499028406 +0100
@@ -180,17 +180,12 @@ xfs_file_fsync(
 		 * disk yet, the inode will be still be pinned.  If it is,
 		 * force the log.
 		 */
-		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 		if (xfs_ipincount(ip)) {
-			if (ip->i_itemp->ili_last_lsn) {
-				error = _xfs_log_force_lsn(ip->i_mount,
-						ip->i_itemp->ili_last_lsn,
-						XFS_LOG_SYNC, &log_flushed);
-			} else {
-				error = _xfs_log_force(ip->i_mount,
-						XFS_LOG_SYNC, &log_flushed);
-			}
+			error = _xfs_log_force_lsn(ip->i_mount,
+					ip->i_itemp->ili_last_lsn,
+					XFS_LOG_SYNC, &log_flushed);
 		}
+		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 	}
 
 	if (ip->i_mount->m_flags & XFS_MOUNT_BARRIER) {