Commit 261d812b authored by Qu Wenruo's avatar Qu Wenruo Committed by David Sterba
Browse files

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: default avatarNikolay Borisov <nborisov@suse.com>
Signed-off-by: default avatarQu Wenruo <wqu@suse.com>
[hch: split from a larger patch, and iterate over the offset instead of
      the offset bits]
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ add parameter comments ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent a89ce08c

fs/btrfs/volumes.h

+16 −0
Original line number Diff line number Diff line
@@ -391,6 +391,22 @@ static inline void btrfs_bio_free_csum(struct btrfs_bio *bbio) 
	}

}



/*

 * Iterate through a btrfs_bio (@bbio) on a per-sector basis.

 *

 * bvl        - struct bio_vec

 * bbio       - struct btrfs_bio

 * iters      - struct bvec_iter

 * bio_offset - unsigned int

 */

#define btrfs_bio_for_each_sector(fs_info, bvl, bbio, iter, bio_offset)	\

	for ((iter) = (bbio)->iter, (bio_offset) = 0;			\

	     (iter).bi_size &&					\

	     (((bvl) = bio_iter_iovec((&(bbio)->bio), (iter))), 1);	\

	     (bio_offset) += fs_info->sectorsize,			\

	     bio_advance_iter_single(&(bbio)->bio, &(iter),		\

	     (fs_info)->sectorsize))



struct btrfs_io_stripe {

	struct btrfs_device *dev;

	u64 physical;