btrfs: split btrfs_set_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 but leave a helper that still takes the variable lock type to make current code compile. 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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