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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2012-10-10 01:04:58 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-10-10 01:04:58 -0400 |
| commit | dee1f973ca341c266229faa5a1a5bb268bed3531 (patch) | |
| tree | 1be44adf3df6f32f8d13df54a0e68f7fd8b9ac26 /lib/ts_bm.c | |
| parent | 60d4616f3dc63371b3dc367e5e88fd4b4f037f65 (diff) | |
| download | linux-dee1f973ca341c266229faa5a1a5bb268bed3531.tar.gz linux-dee1f973ca341c266229faa5a1a5bb268bed3531.tar.bz2 linux-dee1f973ca341c266229faa5a1a5bb268bed3531.zip | |
ext4: race-condition protection for ext4_convert_unwritten_extents_endio
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>
Cc: stable@vger.kernel.org
Diffstat (limited to 'lib/ts_bm.c')
0 files changed, 0 insertions, 0 deletions