On 2/26/20 1:37 AM, Bob Liu wrote:

This RFC provides a rough implementation of a mechanism to allow
userspace to attach protection information (e.g. T10 DIF) data to a
disk write and to receive the information alongside a disk read.
The interface is an extension to the io_uring interface:
two new commands (IORING_OP_READV{WRITEV}_PI) are provided.
The last struct iovec in the arg list is interpreted to point to a buffer
containing the the PI data.

Patch #1 add two new commands to io_uring.
Patch #2 introduces two helper funcs in bio-integrity.
Patch #3 implement the PI passthrough in direct-io of block-dev.
(Similar extensions may add to fs/direct-io.c and fs/maps/directio.c)
Patch #4 add io_uring use space test case to liburing.

No strong feelings on the support in general, the io_uring bits are
trivial enough (once fixed up, per comments in that patch) that I
have no objections on that front.

I'd really like Martin to render an opinion on the API (PI info in
last vec), since he's the integrity guy.

-- 
Jens Axboe