diff options
| author | Jan Kara <jack@suse.cz> | 2017-08-05 17:43:24 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-08-05 17:43:24 -0400 |
| commit | fcf5ea10992fbac3c7473a1db33d56a139333cd1 (patch) | |
| tree | 6d34847e81c3b949606546a24627ae82a422b50c /fs/fs_pin.c | |
| parent | e45105772db41c5318b2a7ec1c420183183414e3 (diff) | |
ext4: fix SEEK_HOLE/SEEK_DATA for blocksize < pagesize
ext4_find_unwritten_pgoff() does not properly handle a situation when
starting index is in the middle of a page and blocksize < pagesize. The
following command shows the bug on filesystem with 1k blocksize:
xfs_io -f -c "falloc 0 4k" \
-c "pwrite 1k 1k" \
-c "pwrite 3k 1k" \
-c "seek -a -r 0" foo
In this example, neither lseek(fd, 1024, SEEK_HOLE) nor lseek(fd, 2048,
SEEK_DATA) will return the correct result.
Fix the problem by neglecting buffers in a page before starting offset.
Reported-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Jan Kara <jack@suse.cz>
CC: stable@vger.kernel.org # 3.8+
Diffstat (limited to 'fs/fs_pin.c')
0 files changed, 0 insertions, 0 deletions