On 3/5/23 22:30, Shin'ichiro Kawasaki wrote:
When sd driver revalidates host-managed SMR disks, it calls disk_set_zoned() which changes the zone_write_granularity attribute value to the logical block size regardless of the device type. After that, the sd driver overwrites the value in sd_zbc_read_zone() with the physical block size, since ZBC/ZAC requires it for the host-managed disks. Between the calls to disk_set_zoned() and sd_zbc_read_zone(), there exists a window that the attribute shows the logical block size as the zone_write_granularity value, which is wrong for the host-managed disks. The duration of the window is from 20ms to 200ms, depending on report zone command execution time. To avoid the wrong zone_write_granularity value between disk_set_zoned() and sd_zbc_read_zone(), modify the value not in sd_zbc_read_zone() but just after disk_set_zoned() call.
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
