xfs: check XFS_EOFBLOCKS_RELEASED earlier in xfs_release_eofblocks

If the XFS_EOFBLOCKS_RELEASED flag is set, we are not going to free the
eofblocks, so don't bother locking the inode or performing the checks in
xfs_can_free_eofblocks.  Also switch to a test_and_set operation once
the iolock has been acquire so that only the caller that sets it actually
frees the post-EOF blocks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>

fs/xfs/xfs_file.c

@@ -1234,12 +1234,11 @@ xfs_file_release(
 	 */
 	if (inode->i_nlink &&
 	    (file->f_mode & FMODE_WRITE) &&
+	    !xfs_iflags_test(ip, XFS_EOFBLOCKS_RELEASED) &&
 	    xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
 		if (xfs_can_free_eofblocks(ip) &&
-		    !xfs_iflags_test(ip, XFS_EOFBLOCKS_RELEASED)) {
+		    !xfs_iflags_test_and_set(ip, XFS_EOFBLOCKS_RELEASED))
 			xfs_free_eofblocks(ip);
-			xfs_iflags_set(ip, XFS_EOFBLOCKS_RELEASED);
-		}
 		xfs_iunlock(ip, XFS_IOLOCK_EXCL);
 	}