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Documentation: ABI: stable: document the zoned_qd1_writes attribute

Update the documentation file Documentation/ABI/stable/sysfs-block to
describe the zoned_qd1_writes sysfs queue attribute file.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

authored by

Damien Le Moal and committed by
Jens Axboe b0e497db 3d9782f6

+15
+15
Documentation/ABI/stable/sysfs-block
··· 886 886 zone commands, they will be treated as regular block devices and 887 887 zoned will report "none". 888 888 889 + What: /sys/block/<disk>/queue/zoned_qd1_writes 890 + Date: January 2026 891 + Contact: Damien Le Moal <dlemoal@kernel.org> 892 + Description: 893 + [RW] zoned_qd1_writes indicates if write operations to a zoned 894 + block device are being handled using a single issuer context (a 895 + kernel thread) operating at a maximum queue depth of 1. This 896 + attribute is visible only for zoned block devices. The default 897 + value for zoned block devices that are not rotational devices 898 + (e.g. ZNS SSDs or zoned UFS devices) is 0. For rotational zoned 899 + block devices (e.g. SMR HDDs) the default value is 1. Since 900 + this default may not be appropriate for some devices, e.g. 901 + remotely connected devices over high latency networks, the user 902 + can disable this feature by setting this attribute to 0. 903 + 889 904 890 905 What: /sys/block/<disk>/hidden 891 906 Date: March 2023