linux-kernel - [PATCH v6 4/7] block: Define zoned block device operations

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Date:   Fri, 30 Sep 2016 14:12:33 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Shaun Tancheff <shaun.tancheff@...gate.com>,
        linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Hannes Reinecke <hare@...e.de>,
        Michael T Lombardi <michael.t.lombardi@...gate.com>
Subject: [PATCH v6 4/7] block: Define zoned block device operations

From: Shaun Tancheff <shaun.tancheff@...gate.com>

Define REQ_OP_ZONE_REPORT and REQ_OP_ZONE_RESET for handling zones of
host-managed and host-aware zoned block devices. With with these two
new operations, the total number of operations defined reaches 8 and
still fits with the 3 bits definition of REQ_OP_BITS.

Signed-off-by: Shaun Tancheff <shaun.tancheff@...gate.com>
Signed-off-by: Damien Le Moal <damien.lemoal@...t.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
---
 block/blk-core.c          | 4 ++++
 include/linux/blk_types.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/block/blk-core.c b/block/blk-core.c
index 14d7c07..e4eda5d 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1941,6 +1941,10 @@ generic_make_request_checks(struct bio *bio)
 	case REQ_OP_WRITE_SAME:
 		if (!bdev_write_same(bio->bi_bdev))
 			goto not_supported;
+	case REQ_OP_ZONE_REPORT:
+	case REQ_OP_ZONE_RESET:
+		if (!bdev_is_zoned(bio->bi_bdev))
+			goto not_supported;
 		break;
 	default:
 		break;
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index cd395ec..dd50dce 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -243,6 +243,8 @@ enum req_op {
 	REQ_OP_SECURE_ERASE,	/* request to securely erase sectors */
 	REQ_OP_WRITE_SAME,	/* write same block many times */
 	REQ_OP_FLUSH,		/* request for cache flush */
+	REQ_OP_ZONE_REPORT,	/* Get zone information */
+	REQ_OP_ZONE_RESET,	/* Reset a zone write pointer */
 };
 
 #define REQ_OP_BITS 3
-- 
2.9.3