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nilfs2: operations for the_nilfs core object
This adds functions on the_nilfs object, which keeps shared resources and states among a read/write mount and snapshots mounts going individually. the_nilfs is allocated per block device; it is created when user first mount a snapshot or a read/write mount on the device, then it is reused for successive mounts. It will be freed when all mount instances on the device are detached. Signed-off-by: Ryusuke Konishi <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
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