[PATCH 5/7] block: respect blk_crypto_bio_sectors_alignment() in blk-merge
From: Satya Tangirala <hidden>
Date: 2021-01-14 15:48:54
Also in:
lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Make blk_bio_segment_split() respect blk_crypto_bio_sectors_alignment() when calling bio_split(). The number of sectors is rounded down to the required alignment just before the call to bio_split(). This makes it possible for nsegs to be overestimated, but this solution is a lot simpler than trying to calculate the exact number of nsegs required for the aligned number of sectors. A future patch will attempt to calculate nsegs more accurately. Signed-off-by: Satya Tangirala <redacted> --- block/blk-merge.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/block/blk-merge.c b/block/blk-merge.c
index a23a91e12e24..45cda45c1066 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c@@ -236,6 +236,8 @@ static bool bvec_split_segs(const struct request_queue *q, * following is guaranteed for the cloned bio: * - That it has at most get_max_io_size(@q, @bio) sectors. * - That it has at most queue_max_segments(@q) segments. + * - That the number of sectors in the returned bio is aligned to + * blk_crypto_bio_sectors_alignment(@bio) * * Except for discard requests the cloned bio will point at the bi_io_vec of * the original bio. It is the responsibility of the caller to ensure that the
@@ -292,6 +294,9 @@ static int blk_bio_segment_split(struct request_queue *q, */ bio->bi_opf &= ~REQ_HIPRI; + sectors = round_down(sectors, blk_crypto_bio_sectors_alignment(bio)); + if (WARN_ON(sectors == 0)) + return -EIO; *split = bio_split(bio, sectors, GFP_NOIO, bs); return 0; }
--
2.30.0.284.gd98b1dd5eaa7-goog