btrfs: assert nowait mode is not used for some btree search functions
Adds nowait asserts to btree search functions which are not used by buffered IO and direct IO paths. Reviewed-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NStefan Roesch <shr@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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