4.4-stable review patch. If anyone has any objections, please let me know.
------------------ From: Eryu Guan <guane...@gmail.com> commit 6ffe77bad545f4a7c8edd2a4ee797ccfcd894ab4 upstream. In commit bcff24887d00 ("ext4: don't read blocks from disk after extents being swapped") bh is not updated correctly in the for loop and wrong data has been written to disk. generic/324 catches this on sub-page block size ext4. Fixes: bcff24887d00 ("ext4: don't read blocks from disk after extentsbeing swapped") Signed-off-by: Eryu Guan <guane...@gmail.com> Signed-off-by: Theodore Ts'o <ty...@mit.edu> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> --- fs/ext4/move_extent.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -390,6 +390,7 @@ data_copy: *err = ext4_get_block(orig_inode, orig_blk_offset + i, bh, 0); if (*err < 0) break; + bh = bh->b_this_page; } if (!*err) *err = block_commit_write(pagep[0], from, from + replaced_size);