]> git.baikalelectronics.ru Git - kernel.git/commit
Btrfs: fix protection between walking backrefs and root deletion
authorWang Shilong <wangsl.fnst@cn.fujitsu.com>
Thu, 23 Jan 2014 05:47:48 +0000 (13:47 +0800)
committerChris Mason <clm@fb.com>
Wed, 29 Jan 2014 15:06:23 +0000 (07:06 -0800)
commit4c4edc0351ce895c374e017ce3922078090dd120
treed4480e764bdebea4cac696ffb25f9025c61ea240
parent69fa5058320df4526ca339a8cc17b067a1c99f7f
Btrfs: fix protection between walking backrefs and root deletion

There is a race condition between resolving indirect ref and root deletion,
and we should gurantee that root can not be destroyed to avoid accessing
broken tree here.

Here we fix it by holding @subvol_srcu, and we will release it as soon
as we have held root node lock.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
fs/btrfs/backref.c