diff options
| author | Jan Kara <jack@suse.cz> | 2017-08-05 17:43:24 -0400 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2017-08-12 12:17:26 +0200 |
| commit | 0658f0dd3e372bedd7af683ada6ee7d0fba29f1e (patch) | |
| tree | 5c00c1e782e9df0a299bd7d377828729b4523805 /include/linux/stacktrace.h | |
| parent | dd729e9ccc6e2b7ef4b65338f72cf161ef5869e9 (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 'include/linux/stacktrace.h')
0 files changed, 0 insertions, 0 deletions