tree dd217139525a521895125843ca31f61cfbb49dca
parent f3465ca44e2a51fd647c167045768a8ab5a96603
author Yan Zheng <zheng.yan@oracle.com> 1226518452 -0500
committer Chris Mason <chris.mason@oracle.com> 1226518452 -0500

Btrfs: mount ro and remount support

This patch adds mount ro and remount support. The main
changes in patch are: adding btrfs_remount and related
helper function; splitting the transaction related code
out of close_ctree into btrfs_commit_super; updating
allocator to properly handle read only block group.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>