[dm-devel] [PATCH 4/8] block: add zone open, close and finish operations
Damien Le Moal
damien.lemoal at wdc.com
Sun Oct 27 14:05:45 UTC 2019
From: Ajay Joshi <ajay.joshi at wdc.com>
Zoned block devices (ZBC and ZAC devices) allow an explicit control
over the condition (state) of zones. The operations allowed are:
* Open a zone: Transition to open condition to indicate that a zone will
actively be written
* Close a zone: Transition to closed condition to release the drive
resources used for writing to a zone
* Finish a zone: Transition an open or closed zone to the full
condition to prevent write operations
To enable this control for in-kernel zoned block device users, define
the new request operations REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE
and REQ_OP_ZONE_FINISH as well as the generic function
blkdev_zone_mgmt() for submitting these operations on a range of zones.
This results in blkdev_reset_zones() removal and replacement with this
new zone magement function. Users of blkdev_reset_zones() (f2fs and
dm-zoned) are updated accordingly.
Contains contributions from Matias Bjorling, Hans Holmberg,
Dmitry Fomichev, Keith Busch, Damien Le Moal and Christoph Hellwig.
Signed-off-by: Ajay Joshi <ajay.joshi at wdc.com>
Signed-off-by: Matias Bjorling <matias.bjorling at wdc.com>
Signed-off-by: Hans Holmberg <hans.holmberg at wdc.com>
Signed-off-by: Dmitry Fomichev <dmitry.fomichev at wdc.com>
Signed-off-by: Keith Busch <kbusch at kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
---
block/blk-core.c | 12 +++++++++---
block/blk-zoned.c | 35 ++++++++++++++++++++--------------
drivers/md/dm-zoned-metadata.c | 6 +++---
fs/f2fs/segment.c | 3 ++-
include/linux/blk_types.h | 25 ++++++++++++++++++++++++
include/linux/blkdev.h | 5 +++--
6 files changed, 63 insertions(+), 23 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index d5e668ec751b..3306a3c5bed6 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -132,6 +132,9 @@ static const char *const blk_op_name[] = {
REQ_OP_NAME(SECURE_ERASE),
REQ_OP_NAME(ZONE_RESET),
REQ_OP_NAME(ZONE_RESET_ALL),
+ REQ_OP_NAME(ZONE_OPEN),
+ REQ_OP_NAME(ZONE_CLOSE),
+ REQ_OP_NAME(ZONE_FINISH),
REQ_OP_NAME(WRITE_SAME),
REQ_OP_NAME(WRITE_ZEROES),
REQ_OP_NAME(SCSI_IN),
@@ -849,10 +852,10 @@ static inline int blk_partition_remap(struct bio *bio)
goto out;
/*
- * Zone reset does not include bi_size so bio_sectors() is always 0.
- * Include a test for the reset op code and perform the remap if needed.
+ * Zone management bios do not have a sector count but they do have
+ * a start sector filled out and need to be remapped.
*/
- if (bio_sectors(bio) || bio_op(bio) == REQ_OP_ZONE_RESET) {
+ if (bio_sectors(bio) || op_is_zone_mgmt(bio_op(bio))) {
if (bio_check_eod(bio, part_nr_sects_read(p)))
goto out;
bio->bi_iter.bi_sector += p->start_sect;
@@ -936,6 +939,9 @@ generic_make_request_checks(struct bio *bio)
goto not_supported;
break;
case REQ_OP_ZONE_RESET:
+ case REQ_OP_ZONE_OPEN:
+ case REQ_OP_ZONE_CLOSE:
+ case REQ_OP_ZONE_FINISH:
if (!blk_queue_is_zoned(q))
goto not_supported;
break;
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 14785011e798..dab34dc48fb6 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -221,23 +221,27 @@ static inline bool blkdev_allow_reset_all_zones(struct block_device *bdev,
}
/**
- * blkdev_reset_zones - Reset zones write pointer
+ * blkdev_zone_mgmt - Execute a zone management operation on a range of zones
* @bdev: Target block device
- * @sector: Start sector of the first zone to reset
- * @nr_sectors: Number of sectors, at least the length of one zone
+ * @op: Operation to be performed on the zones
+ * @sector: Start sector of the first zone to operate on
+ * @nr_sectors: Number of sectors, should be at least the length of one zone and
+ * must be zone size aligned.
* @gfp_mask: Memory allocation flags (for bio_alloc)
*
* Description:
- * Reset the write pointer of the zones contained in the range
+ * Perform the specified operation on the range of zones specified by
* @sector.. at sector+@nr_sectors. Specifying the entire disk sector range
* is valid, but the specified range should not contain conventional zones.
+ * The operation to execute on each zone can be a zone reset, open, close
+ * or finish request.
*/
-int blkdev_reset_zones(struct block_device *bdev,
- sector_t sector, sector_t nr_sectors,
- gfp_t gfp_mask)
+int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
+ sector_t sector, sector_t nr_sectors,
+ gfp_t gfp_mask)
{
struct request_queue *q = bdev_get_queue(bdev);
- sector_t zone_sectors;
+ sector_t zone_sectors = blk_queue_zone_sectors(q);
sector_t end_sector = sector + nr_sectors;
struct bio *bio = NULL;
int ret;
@@ -248,12 +252,14 @@ int blkdev_reset_zones(struct block_device *bdev,
if (bdev_read_only(bdev))
return -EPERM;
+ if (!op_is_zone_mgmt(op))
+ return -EOPNOTSUPP;
+
if (!nr_sectors || end_sector > bdev->bd_part->nr_sects)
/* Out of range */
return -EINVAL;
/* Check alignment (handle eventual smaller last zone) */
- zone_sectors = blk_queue_zone_sectors(q);
if (sector & (zone_sectors - 1))
return -EINVAL;
@@ -269,12 +275,13 @@ int blkdev_reset_zones(struct block_device *bdev,
* Special case for the zone reset operation that reset all
* zones, this is useful for applications like mkfs.
*/
- if (blkdev_allow_reset_all_zones(bdev, sector, nr_sectors)) {
+ if (op == REQ_OP_ZONE_RESET &&
+ blkdev_allow_reset_all_zones(bdev, sector, nr_sectors)) {
bio->bi_opf = REQ_OP_ZONE_RESET_ALL;
break;
}
- bio->bi_opf = REQ_OP_ZONE_RESET;
+ bio->bi_opf = op;
bio->bi_iter.bi_sector = sector;
sector += zone_sectors;
@@ -287,7 +294,7 @@ int blkdev_reset_zones(struct block_device *bdev,
return ret;
}
-EXPORT_SYMBOL_GPL(blkdev_reset_zones);
+EXPORT_SYMBOL_GPL(blkdev_zone_mgmt);
/*
* BLKREPORTZONE ioctl processing.
@@ -379,8 +386,8 @@ int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
return -EFAULT;
- return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
- GFP_KERNEL);
+ return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
+ zrange.sector, zrange.nr_sectors, GFP_KERNEL);
}
static inline unsigned long *blk_alloc_zone_bitmap(int node,
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 595a73110e17..feb4718ce6a6 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1312,9 +1312,9 @@ static int dmz_reset_zone(struct dmz_metadata *zmd, struct dm_zone *zone)
if (!dmz_is_empty(zone) || dmz_seq_write_err(zone)) {
struct dmz_dev *dev = zmd->dev;
- ret = blkdev_reset_zones(dev->bdev,
- dmz_start_sect(zmd, zone),
- dev->zone_nr_sectors, GFP_NOIO);
+ ret = blkdev_zone_mgmt(dev->bdev, REQ_OP_ZONE_RESET,
+ dmz_start_sect(zmd, zone),
+ dev->zone_nr_sectors, GFP_NOIO);
if (ret) {
dmz_dev_err(dev, "Reset zone %u failed %d",
dmz_id(zmd, zone), ret);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 808709581481..2c997f94a3b2 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -1771,7 +1771,8 @@ static int __f2fs_issue_discard_zone(struct f2fs_sb_info *sbi,
return -EIO;
}
trace_f2fs_issue_reset_zone(bdev, blkstart);
- return blkdev_reset_zones(bdev, sector, nr_sects, GFP_NOFS);
+ return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
+ sector, nr_sects, GFP_NOFS);
}
/* For conventional zones, use regular discard if supported */
diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index d688b96d1d63..805d0efa2997 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -290,6 +290,12 @@ enum req_opf {
REQ_OP_ZONE_RESET_ALL = 8,
/* write the zero filled sector many times */
REQ_OP_WRITE_ZEROES = 9,
+ /* Open a zone */
+ REQ_OP_ZONE_OPEN = 10,
+ /* Close a zone */
+ REQ_OP_ZONE_CLOSE = 11,
+ /* Transition a zone to full */
+ REQ_OP_ZONE_FINISH = 12,
/* SCSI passthrough using struct scsi_request */
REQ_OP_SCSI_IN = 32,
@@ -417,6 +423,25 @@ static inline bool op_is_discard(unsigned int op)
return (op & REQ_OP_MASK) == REQ_OP_DISCARD;
}
+/*
+ * Check if a bio or request operation is a zone management operation, with
+ * the exception of REQ_OP_ZONE_RESET_ALL which is treated as a special case
+ * due to its different handling in the block layer and device response in
+ * case of command failure.
+ */
+static inline bool op_is_zone_mgmt(enum req_opf op)
+{
+ switch (op & REQ_OP_MASK) {
+ case REQ_OP_ZONE_RESET:
+ case REQ_OP_ZONE_OPEN:
+ case REQ_OP_ZONE_CLOSE:
+ case REQ_OP_ZONE_FINISH:
+ return true;
+ default:
+ return false;
+ }
+}
+
static inline int op_stat_group(unsigned int op)
{
if (op_is_discard(op))
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index f3ea78b0c91c..bf797a63388c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -360,8 +360,9 @@ extern unsigned int blkdev_nr_zones(struct block_device *bdev);
extern int blkdev_report_zones(struct block_device *bdev,
sector_t sector, struct blk_zone *zones,
unsigned int *nr_zones);
-extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
- sector_t nr_sectors, gfp_t gfp_mask);
+extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
+ sector_t sectors, sector_t nr_sectors,
+ gfp_t gfp_mask);
extern int blk_revalidate_disk_zones(struct gendisk *disk);
extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
--
2.21.0
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