diff options
| author | Yongqiang Yang <xiaoqiangnk@gmail.com> | 2011-12-13 21:51:55 -0500 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2011-12-26 22:25:11 +0800 |
| commit | e6fd79db787f7a638c3557640a1334187333889f (patch) | |
| tree | 3f413f92762c7addacfca446be50065f86874297 /fs | |
| parent | 64740d3a066cfb89fc8b46281dfa47c4202835e0 (diff) | |
ext4: avoid potential hang in mpage_submit_io() when blocksize < pagesize
If there is an unwritten but clean buffer in a page and there is a
dirty buffer after the buffer, then mpage_submit_io does not write the
dirty buffer out. As a result, da_writepages loops forever.
This patch fixes the problem by checking dirty flag.
Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/inode.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index b5edc6e4bab..cf20e1fe778 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1339,8 +1339,11 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd, clear_buffer_unwritten(bh); } - /* skip page if block allocation undone */ - if (buffer_delay(bh) || buffer_unwritten(bh)) + /* + * skip page if block allocation undone and + * block is dirty + */ + if (ext4_bh_delay_or_unwritten(NULL, bh)) skip_page = 1; bh = bh->b_this_page; block_start += bh->b_size; |