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| author | Miao Xie <miaox@cn.fujitsu.com> | 2014-11-25 16:39:28 +0800 |
|---|---|---|
| committer | Miao Xie <miaox@cn.fujitsu.com> | 2014-12-03 10:18:47 +0800 |
| commit | 4245215d6a8dba1a51c50533b6667919687c0b89 (patch) | |
| tree | d3d988c61ff1dcf8fe6886e3c2ba3783814d614e /fs/btrfs/scrub.c | |
| parent | 7603597690147a16b5cc77047d7570fa22a22673 (diff) | |
| download | lwn-4245215d6a8dba1a51c50533b6667919687c0b89.tar.gz lwn-4245215d6a8dba1a51c50533b6667919687c0b89.zip | |
Btrfs, raid56: fix use-after-free problem in the final device replace procedure on raid56
The commit c404e0dc (Btrfs: fix use-after-free in the finishing
procedure of the device replace) fixed a use-after-free problem
which happened when removing the source device at the end of device
replace, but at that time, btrfs didn't support device replace
on raid56, so we didn't fix the problem on the raid56 profile.
Currently, we implemented device replace for raid56, so we need
kick that problem out before we enable that function for raid56.
The fix method is very simple, we just increase the bio per-cpu
counter before we submit a raid56 io, and decrease the counter
when the raid56 io ends.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Diffstat (limited to 'fs/btrfs/scrub.c')
| -rw-r--r-- | fs/btrfs/scrub.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 0ae837fd676d..27f2e16cd259 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -1477,7 +1477,7 @@ static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info, ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio, page->recover->raid_map, page->recover->map_length, - page->mirror_num, 1); + page->mirror_num, 0); if (ret) return ret; |