| commit | 2a0f7f5769992bae5b3f97157fd80b2b943be485 | |
| author | Li Zefan <lizf@cn.fujitsu.com> | |
| Mon, 10 Oct 2011 19:43:34 +0000 (10 15:43 -0400) | ||
| committer | Chris Mason <chris.mason@oracle.com> | |
| Mon, 10 Oct 2011 19:43:34 +0000 (10 15:43 -0400) | ||
| tree | ee19a5470211f13d1e53a311cb0d9e2ccc2988fc | treesnapshot (tar.gz zip) |
| parent | b6316429af7f365f307dfd2b6a7a42f2563aef19 | commitdiff |
Btrfs: fix recursive auto-defrag
Follow those steps:
# mount -o autodefrag /dev/sda7 /mnt
# dd if=/dev/urandom of=/mnt/tmp bs=200K count=1
# sync
# dd if=/dev/urandom of=/mnt/tmp bs=8K count=1 conv=notrunc
and then it'll go into a loop: writeback -> defrag -> writeback ...
It's because writeback writes [8K, 200K] and then writes [0, 8K].
I tried to make writeback know if the pages are dirtied by defrag,
but the patch was a bit intrusive. Here I simply set writeback_index
when we defrag a file.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Follow those steps:
# mount -o autodefrag /dev/sda7 /mnt
# dd if=/dev/urandom of=/mnt/tmp bs=200K count=1
# sync
# dd if=/dev/urandom of=/mnt/tmp bs=8K count=1 conv=notrunc
and then it'll go into a loop: writeback -> defrag -> writeback ...
It's because writeback writes [8K, 200K] and then writes [0, 8K].
I tried to make writeback know if the pages are dirtied by defrag,
but the patch was a bit intrusive. Here I simply set writeback_index
when we defrag a file.
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| fs/btrfs/ioctl.c | diffblobblamehistory |