[PATCH v2 11/15] block: introduce BLKREPORTZONESV2 ioctl

[Johannes Thumshirn]

On 11/3/25 2:38 PM, Damien Le Moal wrote:
> Introduce the new BLKREPORTZONESV2 ioctl command to allow user
> applications access to the fast zone report implemented by
> blkdev_report_zones_cached(). This new ioctl is defined as number 142
> and is documented in include/uapi/linux/fs.h.
>
> Unlike the existing BLKREPORTZONES ioctl, this new ioctl uses the flags
> field of struct blk_zone_report also as an input. If the user sets the
> BLK_ZONE_REP_CACHED flag as an input, then blkdev_report_zones_cached()
> is used to generate the zone report using cached zone information. If
> this flag is not set, then BLKREPORTZONESV2 behaves in the same manner
> as BLKREPORTZONES and the zone report is generated by accessing the
> zoned device.


Is there a downside to always do the caching? A.k.a do we need the new 
ioctl or can we keep using the old one and cache the report zones reply?