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tarfs: refine tarfs overall design and implementation details
1) move loopdev setup from Prepare()/Merge() into Mount(), preparing for support of nodev mode in addition to blockdev. 2) store tar file in the global cache directory, mount tarfs at "mnt" instead of "tarfs", to keep consistence with fusedev/fscache drivers. 3) use tempfile/rename mechanism to easy error recover 4) use lock to avoid some possible race conditions 5) use mode 0750 instead of 0755 for new directories 6) associate a Manager with filesystems managed by blockdev Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
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