xfs: clear XFS_IDIRTY_RELEASE on truncate down

When an inode is truncated down, speculative preallocation is
removed from the inode. This should also reset the state bits for
controlling whether preallocation is subsequently removed when the
file is next closed. The flag is not being cleared, so repeated
operations on a file that first involve a truncate (e.g. multiple
repeated dd invocations on a file) give different file layouts for
the second and subsequent invocations.

Fix this by clearing the XFS_IDIRTY_RELEASE state bit when the
XFS_ITRUNCATED bit is detected in xfs_release() and hence ensure
that speculative delalloc is removed on files that have been
truncated down.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index b7a5fe7c52c895776f125d53851d40c48795dce7..619720705bc6843e4624ce02c27829fa32256ba9 100644 (file)
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -960,8 +960,11 @@ xfs_release(
                 * be exposed to that problem.
                 */
                truncated = xfs_iflags_test_and_clear(ip, XFS_ITRUNCATED);
-               if (truncated && VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
-                       xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
+               if (truncated) {
+                       xfs_iflags_clear(ip, XFS_IDIRTY_RELEASE);
+                       if (VN_DIRTY(VFS_I(ip)) && ip->i_delayed_blks > 0)
+                               xfs_flush_pages(ip, 0, -1, XBF_ASYNC, FI_NONE);
+               }
        }
 
        if (ip->i_d.di_nlink == 0)