On Mon, Mar 08, 2021 at 12:32:32PM +0900, Shin'ichiro Kawasaki wrote:
> When zone reset ioctl and data read race for a same zone on zoned block
> devices, the data read leaves stale page cache even though the zone
> reset ioctl zero clears all the zone data on the device. To avoid
> non-zero data read from the stale page cache after zone reset, discard
> page cache of reset target zones. In same manner as fallocate, call the
> function truncate_bdev_range() in blkdev_zone_mgmt_ioctl() before and
> after zone reset to ensure the page cache discarded.
>
> This patch can be applied back to the stable kernel version v5.10.y.
> Rework is needed for older stable kernels.
>
> Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx>
> Fixes: 3ed05a987e0f ("blk-zoned: implement ioctls")
> Cc: <stable@xxxxxxxxxxxxxxx> # 5.10+
This looks good to me.
Reviewed-by: Keith Busch <kbusch@xxxxxxxxxx>
