linux-kernel - [RFC 1/7] block: support pi with extended metadata

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Date:   Mon, 24 Jan 2022 08:01:01 -0800
From:   Keith Busch <kbusch@...nel.org>
To:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Cc:     axboe@...nel.dk, hch@....de, martin.petersen@...cle.com,
        colyli@...e.de, arnd@...db.de, Keith Busch <kbusch@...nel.org>
Subject: [RFC 1/7] block: support pi with extended metadata

The nvme spec allows protection information formats with metadata
extending beyond the pi field. Use the actual size of the metadata field
for incrementing the protection buffer.

Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
---
 block/bio-integrity.c         | 1 +
 block/t10-pi.c                | 4 ++--
 include/linux/blk-integrity.h | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index d25114715459..e40b1f965960 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -165,6 +165,7 @@ static blk_status_t bio_integrity_process(struct bio *bio,
 
 	iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
 	iter.interval = 1 << bi->interval_exp;
+	iter.tuple_size = bi->tuple_size;
 	iter.seed = proc_iter->bi_sector;
 	iter.prot_buf = bvec_virt(bip->bip_vec);
 
diff --git a/block/t10-pi.c b/block/t10-pi.c
index 25a52a2a09a8..758a76518854 100644
--- a/block/t10-pi.c
+++ b/block/t10-pi.c
@@ -44,7 +44,7 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 			pi->ref_tag = 0;
 
 		iter->data_buf += iter->interval;
-		iter->prot_buf += sizeof(struct t10_pi_tuple);
+		iter->prot_buf += iter->tuple_size;
 		iter->seed++;
 	}
 
@@ -93,7 +93,7 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 
 next:
 		iter->data_buf += iter->interval;
-		iter->prot_buf += sizeof(struct t10_pi_tuple);
+		iter->prot_buf += iter->tuple_size;
 		iter->seed++;
 	}
 
diff --git a/include/linux/blk-integrity.h b/include/linux/blk-integrity.h
index 8a038ea0717e..378b2459efe2 100644
--- a/include/linux/blk-integrity.h
+++ b/include/linux/blk-integrity.h
@@ -19,6 +19,7 @@ struct blk_integrity_iter {
 	sector_t		seed;
 	unsigned int		data_size;
 	unsigned short		interval;
+	unsigned char		tuple_size;
 	const char		*disk_name;
 };
 
-- 
2.25.4