btrfs: add a helper to iterate through a btrfs_bio with sector sized chunks

Add a helper that works similar to __bio_for_each_segment, but instead of
iterating over PAGE_SIZE chunks it iterates over each sector.

Reviewed-by: Nikolay Borisov <[email protected]>
Signed-off-by: Qu Wenruo <[email protected]>
[hch: split from a larger patch, and iterate over the offset instead of
      the offset bits]
Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: David Sterba <[email protected]>
[ add parameter comments ]
Signed-off-by: David Sterba <[email protected]>

0 files changed, 0 insertions, 0 deletions