btrfs: split btrfs_clear_lock_blocking_rw to read and write helpers
There are many callers that hardcode the desired lock type so we can avoid the switch and call them directly. Split the current function to two. There are no remaining users of btrfs_clear_lock_blocking_rw so it's removed. The call sites will be converted in followup patches. Reviewed-by: NJohannes Thumshirn <jthumshirn@suse.de> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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