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由 Yan Zheng 提交于
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: NYan Zheng <zheng.yan@oracle.com>
c146afad