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zloop: add max_open_zones option

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Introduce the new max_open_zones option to allow specifying a limit on
the maximum number of open zones of a zloop device. This change allows
creating a zloop device that can more closely mimick the characteristics
of a physical SMR drive.

When set to a non zero value, only up to max_open_zones zones can be in
the implicit open (BLK_ZONE_COND_IMP_OPEN) and explicit open
(BLK_ZONE_COND_EXP_OPEN) conditions at any time. The transition to the
implicit open condition of a zone on a write operation can result in an
implicit close of an already implicitly open zone. This is handled in
the function zloop_do_open_zone(). This function also handles
transitions to the explicit open condition. Implicit close transitions
are handled using an LRU ordered list of open zones which is managed
using the helper functions zloop_lru_rotate_open_zone() and
zloop_lru_remove_open_zone().

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20260326203245.946830-1-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal
2026-03-27 05:32:45 +09:00
committed by Jens Axboe
parent 2a2f520fda
commit b2a78fec34
2 changed files with 168 additions and 17 deletions
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5
Documentation/admin-guide/blockdev/zoned_loop.rst
View File

@@ -62,7 +62,7 @@ The options available for the add command can be listed by reading the
/dev/zloop-control device::
$ cat /dev/zloop-control
add id=%d,capacity_mb=%u,zone_size_mb=%u,zone_capacity_mb=%u,conv_zones=%u,base_dir=%s,nr_queues=%u,queue_depth=%u,buffered_io
add id=%d,capacity_mb=%u,zone_size_mb=%u,zone_capacity_mb=%u,conv_zones=%u,max_open_zones=%u,base_dir=%s,nr_queues=%u,queue_depth=%u,buffered_io,zone_append=%u,ordered_zone_append,discard_write_cache
remove id=%d
In more details, the options that can be used with the "add" command are as
@@ -80,6 +80,9 @@ zone_capacity_mb Device zone capacity (must always be equal to or lower
conv_zones Total number of conventioanl zones starting from
sector 0
Default: 8
max_open_zones Maximum number of open sequential write required zones
(0 for no limit).
Default: 0
base_dir Path to the base directory where to create the directory
containing the zone files of the device.
Default=/var/local/zloop.