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| author | Jan Kara <jack@suse.cz> | 2017-08-06 00:43:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 18:49:30 +0300 |
| commit | 0814c3a9447ba284ef91b2d27755bf5a4514ca64 (patch) | |
| tree | 350d0b62cc50cd2f482c6951b1244008afb7b00c /fs/ext4/move_extent.c | |
| parent | b680e22fca767103ea4f86e21a8cca927f9d1ca7 (diff) | |
| download | linux-0814c3a9447ba284ef91b2d27755bf5a4514ca64.tar.xz | |
ext4: fix SEEK_HOLE/SEEK_DATA for blocksize < pagesize
commit fcf5ea10992fbac3c7473a1db33d56a139333cd1 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/ext4/move_extent.c')
0 files changed, 0 insertions, 0 deletions