[PATCH 00/13] Introduce cached report zones

Damien Le Moal
2025-10-31T06:16:55Z

The patch series implements a cached report zones using information from
the block layer zone write plugs and a new zone condition tracking. This
avoids having to execute slow report zones commands on the device when
for instance mounting file systems, which can significantly speed things
up, especially in setups with multiple SMR HDDs (e.g. a RAID volume).

The first patch improves zone resource updates. The following 3 patches
cleanup and improve handling of zone reports and of other zone
management operations. From patch 5 to 10, cached report zones in
implemented and made available to users with a new ioctl() command.

Finally, patches 12 and 13 introduce the use of cached report zones in
the mount operation of XFS and BTRFS.

These patches are against Jen's for-next tree.

Damien Le Moal (13):
block: freeze queue when updating zone resources
block: cleanup blkdev_report_zones()
block: handle zone management operations completions
block: introduce disk_report_zone()
block: reorganize struct blk_zone_wplug
block: use zone condition to determine conventional zones
block: track zone conditions
block: introduce blkdev_get_zone_info()
block: introduce blkdev_report_zones_cached()
block: introduce BLKREPORTZONESV2 ioctl
block: add zone write plug condition to debugfs zone_wplugs
btrfs: use blkdev_report_zones_cached()
xfs: use blkdev_report_zones_cached()

block/blk-zoned.c | 762 ++++++++++++++++++++++++------
block/blk.h | 14 +
block/ioctl.c | 1 +
drivers/block/null_blk/null_blk.h | 3 +-
drivers/block/null_blk/zoned.c | 4 +-
drivers/block/ublk_drv.c | 4 +-
drivers/block/virtio_blk.c | 11 +-
drivers/block/zloop.c | 4 +-
drivers/md/dm-zone.c | 54 ++-
drivers/md/dm.h | 3 +-
drivers/nvme/host/core.c | 5 +-
drivers/nvme/host/multipath.c | 4 +-
drivers/nvme/host/nvme.h | 2 +-
drivers/nvme/host/zns.c | 10 +-
drivers/scsi/sd.h | 2 +-
drivers/scsi/sd_zbc.c | 17 +-
fs/btrfs/zoned.c | 11 +-
fs/xfs/xfs_zone_alloc.c | 2 +-
include/linux/blkdev.h | 44 +-
include/linux/device-mapper.h | 10 +-
include/uapi/linux/blkzoned.h | 36 +-
include/uapi/linux/fs.h | 2 +-
22 files changed, 746 insertions(+), 259 deletions(-)

base-commit: ba6a8208cc205c6545c610b5863ea89466fc486a
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2.51.0