Re: [PATCH v4 1/7] block: Add 'zoned' queue limit

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"Damien" == Damien Le Moal [off-list ref] writes:

Damien> Add the zoned queue limit to indicate the zoning model of a
Damien> block device.  Defined values are 0 (BLK_ZONED_NONE) for regular
Damien> block devices, 1 (BLK_ZONED_HA) for host-aware zone block
Damien> devices and 2 (BLK_ZONED_HM) for host-managed zone block
Damien> devices. The standards defined drive managed model is not
Damien> defined here since these block devices do not provide any
Damien> command for accessing zone information. Drive managed model
Damien> devices will be reported as BLK_ZONED_NONE.

Damien> The helper functions blk_queue_zoned_model and bdev_zoned_model
Damien> return the zoned limit and the functions blk_queue_is_zoned and
Damien> bdev_is_zoned return a boolean for callers to test if a block
Damien> device is zoned.

Damien> The zoned attribute is also exported as a string to applications
Damien> via sysfs. BLK_ZONED_NONE shows as "none", BLK_ZONED_HA as
Damien> "host-aware" and BLK_ZONED_HM as "host-managed".

Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>

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Martin K. Petersen	Oracle Linux Engineering