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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2012-10-10 01:04:58 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-28 10:56:09 -0700 |
| commit | e28b27be06c5e6a5236c0c0b370ca0768ab086bb (patch) | |
| tree | 8799b840f39307225500926e79bf31ea9003897b /fs/ext4/resize.c | |
| parent | 9f2a940965286754f3a34d5737c3097c05db8725 (diff) | |
ext4: race-condition protection for ext4_convert_unwritten_extents_endio
commit dee1f973ca341c266229faa5a1a5bb268bed3531 upstream.
We assumed that at the time we call ext4_convert_unwritten_extents_endio()
extent in question is fully inside [map.m_lblk, map->m_len] because
it was already split during submission. But this may not be true due to
a race between writeback vs fallocate.
If extent in question is larger than requested we will split it again.
Special precautions should being done if zeroout required because
[map.m_lblk, map->m_len] already contains valid data.
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4/resize.c')
0 files changed, 0 insertions, 0 deletions