On Tue, Sep 20, 2022 at 05:46:15PM +0300, Alexander V. Buev wrote:

This series of patches makes possible to do direct block IO
with integrity payload using io uring kernel interface.
Userspace app can utilize new READV_PI/WRITEV_PI operation with a new
fields in sqe struct (pi_addr/pi_len) to provide iovec's with
integrity data.

Is this really intended to be used exclusively for PI? Once you give use space
access to extended metadata regions, they can use it for whatever the user
wants, which may not be related to protection information formats. Perhaps a
more generic suffix than "_PI" may be appropriate like _EXT or _META?