From 659bf827ba8f1183b714341d8a1d4b1e446178d9 Mon Sep 17 00:00:00 2001 From: Niklas Cassel Date: Tue, 14 Jul 2020 23:18:24 +0200 Subject: block: add max_active_zones to blk-sysfs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a new max_active zones definition in the sysfs documentation. This definition will be common for all devices utilizing the zoned block device support in the kernel. Export max_active_zones according to this new definition for NVMe Zoned Namespace devices, ZAC ATA devices (which are treated as SCSI devices by the kernel), and ZBC SCSI devices. Add the new max_active_zones member to struct request_queue, rather than as a queue limit, since this property cannot be split across stacking drivers. For SCSI devices, even though max active zones is not part of the ZBC/ZAC spec, export max_active_zones as 0, signifying "no limit". Signed-off-by: Niklas Cassel Reviewed-by: Javier González Reviewed-by: Damien Le Moal Reviewed-by: Johannes Thumshirn Reviewed-by: Martin K. Petersen Signed-off-by: Jens Axboe --- Documentation/block/queue-sysfs.rst | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'Documentation/block') diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst index f01cf8530ae4..f261a5c84170 100644 --- a/Documentation/block/queue-sysfs.rst +++ b/Documentation/block/queue-sysfs.rst @@ -117,6 +117,13 @@ Maximum number of elements in a DMA scatter/gather list with integrity data that will be submitted by the block layer core to the associated block driver. +max_active_zones (RO) +--------------------- +For zoned block devices (zoned attribute indicating "host-managed" or +"host-aware"), the sum of zones belonging to any of the zone states: +EXPLICIT OPEN, IMPLICIT OPEN or CLOSED, is limited by this value. +If this value is 0, there is no limit. + max_open_zones (RO) ------------------- For zoned block devices (zoned attribute indicating "host-managed" or -- cgit v1.2.3