Btrfs: move get root out of btrfs_search_slot to a helper
It's good to have a helper instead of having all get-root details open-coded. The new helper locks (if necessary) and sets root node of the path. Also invert the checks to make the code flow easier to read. There is no functional change in this commit. Signed-off-by: NLiu Bo <bo.liu@linux.alibaba.com> Reviewed-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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