On 3/11/21 12:25 AM, 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 blkdev_zone_mgmt_ioctl(). Introduce > the helper function blkdev_truncate_zone_range() to discard the page > cache. Ensure the page cache discarded by calling the helper function > before and after zone reset in same manner as fallocate does. > > This patch can be applied back to the stable kernel version v5.10.y. > Rework is needed for older stable kernels. Applied, thanks. -- Jens Axboe
