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From: Johannes Thumshirn <johannes.thumshirn@wdc.com>
To: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@infradead.org>,
	linux-block <linux-block@vger.kernel.org>,
	Damien Le Moal <Damien.LeMoal@wdc.com>,
	Keith Busch <kbusch@kernel.org>,
	"linux-scsi @ vger . kernel . org" <linux-scsi@vger.kernel.org>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	"linux-fsdevel @ vger . kernel . org"
	<linux-fsdevel@vger.kernel.org>,
	Damien Le Moal <damien.lemoal@wdc.com>,
	Hannes Reinecke <hare@suse.de>, Christoph Hellwig <hch@lst.de>,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: [PATCH v10 7/9] null_blk: Support REQ_OP_ZONE_APPEND
Date: Thu,  7 May 2020 01:11:43 +0900	[thread overview]
Message-ID: <20200506161145.9841-8-johannes.thumshirn@wdc.com> (raw)
In-Reply-To: <20200506161145.9841-1-johannes.thumshirn@wdc.com>

From: Damien Le Moal <damien.lemoal@wdc.com>

Support REQ_OP_ZONE_APPEND requests for null_blk devices with zoned
mode enabled. Use the internally tracked zone write pointer position
as the actual write position and return it using the command request
__sector field in the case of an mq device and using the command BIO
sector in the case of a BIO device.

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
---
 drivers/block/null_blk_zoned.c | 37 ++++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 8 deletions(-)

diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index 46641df2e58e..9c19f747f394 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -70,13 +70,20 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
 
 int null_register_zoned_dev(struct nullb *nullb)
 {
+	struct nullb_device *dev = nullb->dev;
 	struct request_queue *q = nullb->q;
 
-	if (queue_is_mq(q))
-		return blk_revalidate_disk_zones(nullb->disk, NULL);
+	if (queue_is_mq(q)) {
+		int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
+
+		if (ret)
+			return ret;
+	} else {
+		blk_queue_chunk_sectors(q, dev->zone_size_sects);
+		q->nr_zones = blkdev_nr_zones(nullb->disk);
+	}
 
-	blk_queue_chunk_sectors(q, nullb->dev->zone_size_sects);
-	q->nr_zones = blkdev_nr_zones(nullb->disk);
+	blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
 
 	return 0;
 }
@@ -138,7 +145,7 @@ size_t null_zone_valid_read_len(struct nullb *nullb,
 }
 
 static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
-		     unsigned int nr_sectors)
+				    unsigned int nr_sectors, bool append)
 {
 	struct nullb_device *dev = cmd->nq->dev;
 	unsigned int zno = null_zone_no(dev, sector);
@@ -158,9 +165,21 @@ static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
 	case BLK_ZONE_COND_IMP_OPEN:
 	case BLK_ZONE_COND_EXP_OPEN:
 	case BLK_ZONE_COND_CLOSED:
-		/* Writes must be at the write pointer position */
-		if (sector != zone->wp)
+		/*
+		 * Regular writes must be at the write pointer position.
+		 * Zone append writes are automatically issued at the write
+		 * pointer and the position returned using the request or BIO
+		 * sector.
+		 */
+		if (append) {
+			sector = zone->wp;
+			if (cmd->bio)
+				cmd->bio->bi_iter.bi_sector = sector;
+			else
+				cmd->rq->__sector = sector;
+		} else if (sector != zone->wp) {
 			return BLK_STS_IOERR;
+		}
 
 		if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
 			zone->cond = BLK_ZONE_COND_IMP_OPEN;
@@ -242,7 +261,9 @@ blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op,
 {
 	switch (op) {
 	case REQ_OP_WRITE:
-		return null_zone_write(cmd, sector, nr_sectors);
+		return null_zone_write(cmd, sector, nr_sectors, false);
+	case REQ_OP_ZONE_APPEND:
+		return null_zone_write(cmd, sector, nr_sectors, true);
 	case REQ_OP_ZONE_RESET:
 	case REQ_OP_ZONE_RESET_ALL:
 	case REQ_OP_ZONE_OPEN:
-- 
2.24.1


  parent reply	other threads:[~2020-05-06 16:12 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 16:11 [PATCH v10 0/9] Introduce Zone Append for writing to zoned block devices Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 1/9] block: rename __bio_add_pc_page to bio_add_hw_page Johannes Thumshirn
2020-05-06 18:16   ` Hannes Reinecke
2020-05-06 16:11 ` [PATCH v10 2/9] block: Introduce REQ_OP_ZONE_APPEND Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 3/9] block: introduce blk_req_zone_write_trylock Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 4/9] block: Modify revalidate zones Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 5/9] scsi: sd_zbc: factor out sanity checks for zoned commands Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 6/9] scsi: sd_zbc: emulate ZONE_APPEND commands Johannes Thumshirn
2020-05-06 18:18   ` Hannes Reinecke
2020-05-06 16:11 ` Johannes Thumshirn [this message]
2020-05-06 16:11 ` [PATCH v10 8/9] block: export bio_release_pages and bio_iov_iter_get_pages Johannes Thumshirn
2020-05-06 16:11 ` [PATCH v10 9/9] zonefs: use REQ_OP_ZONE_APPEND for sync DIO Johannes Thumshirn

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