]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
Btrfs: fix race between balance recovery and root deletion
authorWang Shilong <wangsl.fnst@cn.fujitsu.com>
Thu, 26 Jun 2014 03:08:16 +0000 (11:08 +0800)
committerChris Mason <clm@fb.com>
Thu, 3 Jul 2014 14:04:04 +0000 (07:04 -0700)
commit5f3164813b90f7dbcb5c3ab9006906222ce471b7
treeb176f089dda953a935d4987c6d02ea3783cb56d7
parent3cc79392558f1789e5e1d2fce44b681980f403c3
Btrfs: fix race between balance recovery and root deletion

Balance recovery is called when RW mounting or remounting from
RO to RW, it is called to finish roots merging.

When doing balance recovery, relocation root's corresponding
fs root(whose root refs is 0) might be destroyed by cleaner
thread, this will make btrfs fail to mount.

Fix this problem by holding @cleaner_mutex when doing balance
recovery.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
fs/btrfs/disk-io.c
fs/btrfs/super.c