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btrfs: raid56: reduce overhead to calculate the bio length

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In rbio_update_error_bitmap(), we need to calculate the length of the
rbio.  As since it's called in the endio function, we can not directly
grab the length from bi_iter.

Currently we call bio_for_each_segment_all(), which will always return a
range inside a page.  But that's not necessary as we don't really care
about anything inside the page.

So use bio_for_each_bvec_all(), which can return a bvec across multiple
continuous pages thus reduce the loops.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2023-01-21 16:06:12 +08:00 • committed by David Sterba
parent 67da05b3f2
commit c9a43aaf09
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/raid56.c
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@ -1425,10 +1425,9 @@ static void rbio_update_error_bitmap(struct btrfs_raid_bio *rbio, struct bio *bi
int total_sector_nr = get_bio_sector_nr(rbio, bio);
u32 bio_size = 0;
struct bio_vec *bvec;
struct bvec_iter_all iter_all;
int i;
bio_for_each_segment_all(bvec, bio, iter_all)
bio_for_each_bvec_all(bvec, bio, i)
bio_size += bvec->bv_len;
/*