tree 1befd9a2bea8e1808f0fe1b12406c05b3f7dbe2d
parent 1c1161870c8bcb0d966ebbf1aec05a87a79a4175
author Miao Xie <miaox@cn.fujitsu.com> 1409751338 +0800
committer Chris Mason <clm@fb.com> 1410986318 -0700

Btrfs: fix unprotected device's variants on 32bits machine

->total_bytes,->disk_total_bytes,->bytes_used is protected by chunk
lock when we change them, but sometimes we read them without any lock,
and we might get unexpected value. We fix this problem like inode's
i_size.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>