Btrfs: Check INCOMPAT flags on remount and add helper function
In support of the recently added capability to remount with lzo compression, provide a helper function to check the compression INCOMPAT flags when remounting with lzo compression, and set the flags if necessary. Also, implement the new helper function when defragmenting with explicit lzo compression and when setting the default subvolume. Signed-off-by: NMitch Harder <mitch.harder@sabayonlinux.org> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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