diff options
| author | Li Zefan <lizf@cn.fujitsu.com> | 2011-10-10 21:43:34 +0200 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-10-10 21:43:34 +0200 |
| commit | 2a0f7f5769992bae5b3f97157fd80b2b943be485 (patch) | |
| tree | ee19a5470211f13d1e53a311cb0d9e2ccc2988fc /fs/file_table.c | |
| parent | Btrfs: force a page fault if we have a shorty copy on a page boundary (diff) | |
| download | linux-2a0f7f5769992bae5b3f97157fd80b2b943be485.tar.xz linux-2a0f7f5769992bae5b3f97157fd80b2b943be485.zip | |
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>
Diffstat (limited to 'fs/file_table.c')
0 files changed, 0 insertions, 0 deletions