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H A Dvolumes.h261d812b Sun May 22 06:47:53 CDT 2022 Qu Wenruo <wqu@suse.com> 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 <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
[hch: split from a larger patch, and iterate over the offset instead of
the offset bits]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add parameter comments ]
Signed-off-by: David Sterba <dsterba@suse.com>