| commit | 538f72cdf03cad1c21c551ea542c8ce7d9fa2d81 | [log] [tgz] |
|---|---|---|
| author | Wang Shilong <wangsl.fnst@cn.fujitsu.com> | Thu Jan 23 13:47:48 2014 +0800 |
| committer | Chris Mason <clm@fb.com> | Wed Jan 29 07:06:23 2014 -0800 |
| tree | d4480e764bdebea4cac696ffb25f9025c61ea240 | |
| parent | 3c9665df0c5d3f471b07efc32181459386678ebd [diff] |
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>