block: factor out a bio_integrity_setup_default helper

Add a helper to set the seed and check flag based on useful defaults
from the profile.

Note that this includes a small behavior change, as we now only set the
seed if any action is set, which is fine as nothing will look at it
otherwise.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anuj Gupta <anuj20.g@samsung.com>
Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Tested-by: Anuj Gupta <anuj20.g@samsung.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/bio-integrity-auto.c

@@ -88,25 +88,15 @@ bool __bio_integrity_endio(struct bio *bio)
  */
 void bio_integrity_prep(struct bio *bio, unsigned int action)
 {
-	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
 	struct bio_integrity_data *bid;
 
 	bid = mempool_alloc(&bid_pool, GFP_NOIO);
 	bio_integrity_init(bio, &bid->bip, &bid->bvec, 1);
 	bid->bio = bio;
 	bid->bip.bip_flags |= BIP_BLOCK_INTEGRITY;
 	bio_integrity_alloc_buf(bio, action & BI_ACT_ZERO);
-
-	bip_set_seed(&bid->bip, bio->bi_iter.bi_sector);
-
-	if (action & BI_ACT_CHECK) {
-		if (bi->csum_type == BLK_INTEGRITY_CSUM_IP)
-			bid->bip.bip_flags |= BIP_IP_CHECKSUM;
-		if (bi->csum_type)
-			bid->bip.bip_flags |= BIP_CHECK_GUARD;
-		if (bi->flags & BLK_INTEGRITY_REF_TAG)
-			bid->bip.bip_flags |= BIP_CHECK_REFTAG;
-	}
+	if (action & BI_ACT_CHECK)
+		bio_integrity_setup_default(bio);
 
 	/* Auto-generate integrity metadata if this is a write */
 	if (bio_data_dir(bio) == WRITE && bip_should_check(&bid->bip))

block/bio-integrity.c

@@ -101,6 +101,22 @@ void bio_integrity_free_buf(struct bio_integrity_payload *bip)
 		kfree(bvec_virt(bv));
 }
 
+void bio_integrity_setup_default(struct bio *bio)
+{
+	struct blk_integrity *bi = blk_get_integrity(bio->bi_bdev->bd_disk);
+	struct bio_integrity_payload *bip = bio_integrity(bio);
+
+	bip_set_seed(bip, bio->bi_iter.bi_sector);
+
+	if (bi->csum_type) {
+		bip->bip_flags |= BIP_CHECK_GUARD;
+		if (bi->csum_type == BLK_INTEGRITY_CSUM_IP)
+			bip->bip_flags |= BIP_IP_CHECKSUM;
+	}
+	if (bi->flags & BLK_INTEGRITY_REF_TAG)
+		bip->bip_flags |= BIP_CHECK_REFTAG;
+}
+
 /**
  * bio_integrity_free - Free bio integrity payload
  * @bio:	bio containing bip to be freed

include/linux/bio-integrity.h

@@ -143,5 +143,6 @@ static inline int bio_integrity_add_page(struct bio *bio, struct page *page,
 
 void bio_integrity_alloc_buf(struct bio *bio, bool zero_buffer);
 void bio_integrity_free_buf(struct bio_integrity_payload *bip);
+void bio_integrity_setup_default(struct bio *bio);
 
 #endif /* _LINUX_BIO_INTEGRITY_H */