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[6/7] block: add WARN() in bio_split() for sector alignment

Message ID 20210114154723.2495814-7-satyat@google.com (mailing list archive)
State New, archived
Headers show
Series ensure bios aren't split in middle of crypto data unit | expand

Commit Message

Satya Tangirala Jan. 14, 2021, 3:47 p.m. UTC
The number of sectors passed to bio_split() should be aligned to
blk_crypto_bio_sectors_alignment(). All callers have been updated to ensure
this, so add a WARN() if the number of sectors is not aligned.

Signed-off-by: Satya Tangirala <satyat@google.com>
 block/bio.c | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/block/bio.c b/block/bio.c
index 1f2cc1fbe283..c5f577ee6b8d 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1472,6 +1472,7 @@  struct bio *bio_split(struct bio *bio, int sectors,
 	BUG_ON(sectors <= 0);
 	BUG_ON(sectors >= bio_sectors(bio));
+	WARN_ON(!IS_ALIGNED(sectors, blk_crypto_bio_sectors_alignment(bio)));
 	/* Zone append commands cannot be split */
 	if (WARN_ON_ONCE(bio_op(bio) == REQ_OP_ZONE_APPEND))