btrfs: make subvol creation/deletion killable in the early stages
The subvolume ioctls block on the parent directory mutex that can be held by other concurrent snapshot activity for a long time. Give the user at least some chance to get out of this situation by allowing to send a kill signal. Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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