On 10/28/21 16:50, Jens Axboe wrote:
On 10/28/21 9:44 AM, Mikhail Malygin wrote:
Thanks for the feedback, we’ll submit and updated version of the series.
The only question is regarding uapi: should we add a separate opcodes
for read/write or use existing opcodes with the flag in the
io_uring_sqe.rw_flags field?
The flag was discussed in the another submission, where it was
considered to be a better approach over opcodes:
https://patchwork.kernel.org/project/linux-block/patch/20200226083719.4389-2-bob.liu@xxxxxxxxxx/
Separate opcodes is, at least to me, definitely the way to go. Just
looking at the code needing to tap into weird spots for PI is enough to
make that call. On top of that, it also allows you to cleanly define
this command and (hopefully?) avoid that weirdness with implied PI in
the last iovec.
Reminds me struggles with writing encoded data to btrfs. I believe
Omar did go for RWF_ENCODED flag, right?
--
Pavel Begunkov
