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author | Jan Kara <jack@suse.cz> | 2009-12-01 16:53:06 +0100 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-18 14:05:39 -0800 |
commit | 62965d8347a071c72f4dae96e65be5fb68dd052f (patch) | |
tree | 8692745fa597bed740e9d824eaec46f815a9d271 /Documentation | |
parent | ad496b34c6835a89dd3a8f6c07dfcf8a0dd7c277 (diff) |
ext3: Fix data / filesystem corruption when write fails to copy data
commit 68eb3db08344286733adac48304d9fb7a0e53b27 upstream.
When ext3_write_begin fails after allocating some blocks or
generic_perform_write fails to copy data to write, we truncate blocks already
instantiated beyond i_size. Although these blocks were never inside i_size, we
have to truncate pagecache of these blocks so that corresponding buffers get
unmapped. Otherwise subsequent __block_prepare_write (called because we are
retrying the write) will find the buffers mapped, not call ->get_block, and
thus the page will be backed by already freed blocks leading to filesystem and
data corruption.
Reported-by: James Y Knight <foom@fuhm.net>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
0 files changed, 0 insertions, 0 deletions