tree 820ff487cef7ff214ac245764e74926177d06702
parent 97795d2a5b8d3c8dc4365d4bd3404191840453ba
author Theodore Ts'o <tytso@mit.edu> 1343016020 -0400
committer Theodore Ts'o <tytso@mit.edu> 1343016020 -0400

ext4: undo ext4_calc_metadata_amount if we fail to claim space

The function ext4_calc_metadata_amount() has side effects, although
it's not obvious from its function name.  So if we fail to claim
space, regardless of whether we retry to claim the space again, or
return an error, we need to undo these side effects.

Otherwise we can end up incorrectly calculating the number of metadata
blocks needed for the operation, which was responsible for an xfstests
failure for test #271 when using an ext2 file system with delalloc
enabled.

Reported-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@vger.kernel.org