linux-kernel - [PATCH v2 04/14] block: fix not to apply bip information in blk_rq_bio

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Date:   Wed, 10 May 2023 17:51:11 +0900
From:   Jinyoung CHOI <j-young.choi@...sung.com>
To:     Jinyoung CHOI <j-young.choi@...sung.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "kbusch@...nel.org" <kbusch@...nel.org>, "hch@....de" <hch@....de>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "johannes.thumshirn@....com" <johannes.thumshirn@....com>,
        "kch@...dia.com" <kch@...dia.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 04/14] block: fix not to apply bip information in
 blk_rq_bio_prep()

When a request is initialized through the bio, bio's integrity
information is not reflected in the request. It seems to be missing
when the codes associated with 'nr_integrity_segment' were added.

the lld such as scsi does not refer to this variable. It uses
integrity's bevc to calculate the number of segments for sg-list. So
there seems to be no problem related to this.

Cc: Christoph Hellwig <hch@....de>
Cc: Martin K. Petersen <martin.petersen@...cle.com>

Fixes: 13f05c8d8e98 ("block/scsi: Provide a limit on the number of integrity segments")
Signed-off-by: Jinyoung Choi <j-young.choi@...sung.com>
---
 include/linux/blk-mq.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 1dacb2c81fdd..9310c94577c7 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -961,6 +961,11 @@ static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio,
 	rq->__data_len = bio->bi_iter.bi_size;
 	rq->bio = rq->biotail = bio;
 	rq->ioprio = bio_prio(bio);
+
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
+	if (bio_integrity(bio))
+		rq->nr_integrity_segments = bio_integrity(bio)->bip_vcnt;
+#endif
 }
 
 void blk_mq_hctx_set_fq_lock_class(struct blk_mq_hw_ctx *hctx,
-- 
2.34.1