[GIT PULL] io_uring passthrough support

[Jens Axboe]

Hi Linus,

On top of everything else, this adds support for passthrough for
io_uring. The initial feature for this is NVMe passthrough support,
which allows non-filesystem based IO commands and admin commands. To
support this, io_uring grows support for SQE and CQE members that are
twice as big, allowing to pass in a full NVMe command without having to
copy data around. And to complete with more than just a single 32-bit
value as the output.

This will cause a merge conflict as well, with the provided buffer
change from the core branch, and adding CQE32 support for NOP in this
branch. Resolution:

diff --cc fs/io_uring.c
index 1015dd49e7e5,c5a476e6c068..395d3a921b53
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@@ -4997,17 -5169,11 +5256,23 @@@ static int io_nop_prep(struct io_kiocb 
   */
  static int io_nop(struct io_kiocb *req, unsigned int issue_flags)
  {
++	unsigned int cflags;
 +	void __user *buf;
 +
 +	if (req->flags & REQ_F_BUFFER_SELECT) {
 +		size_t len = 1;
 +
 +		buf = io_buffer_select(req, &len, issue_flags);
 +		if (!buf)
 +			return -ENOBUFS;
 +	}
 +
- 	__io_req_complete(req, issue_flags, 0, io_put_kbuf(req, issue_flags));
++	cflags = io_put_kbuf(req, issue_flags);
+ 	if (!(req->ctx->flags & IORING_SETUP_CQE32))
 -		__io_req_complete(req, issue_flags, 0, 0);
++		__io_req_complete(req, issue_flags, 0, cflags);
+ 	else
 -		__io_req_complete32(req, issue_flags, 0, 0, req->nop.extra1,
 -					req->nop.extra2);
++		__io_req_complete32(req, issue_flags, 0, cflags,
++					req->nop.extra1, req->nop.extra2);
  	return 0;
  }
  

Please pull!


The following changes since commit 7ccba24d3bc084d891def1a6fea504e4cb327a8c:

  io_uring: don't clear req->kbuf when buffer selection is done (2022-05-09 06:29:06 -0600)

are available in the Git repository at:

  git://git.kernel.dk/linux-block.git tags/for-5.19/io_uring-passthrough-2022-05-22

for you to fetch changes up to 3fe07bcd800d6e5e4e4263ca2564d69095c157bf:

  io_uring: cleanup handling of the two task_work lists (2022-05-21 09:17:05 -0600)

----------------------------------------------------------------
for-5.19/io_uring-passthrough-2022-05-22

----------------------------------------------------------------
Anuj Gupta (1):
      nvme: add vectored-io support for uring-cmd

Christoph Hellwig (1):
      nvme: refactor nvme_submit_user_cmd()

Jens Axboe (6):
      Merge branch 'for-5.19/io_uring' into for-5.19/io_uring-passthrough
      Merge branch 'for-5.19/io_uring-socket' into for-5.19/io_uring-passthrough
      io_uring: add support for 128-byte SQEs
      fs,io_uring: add infrastructure for uring-cmd
      block: wire-up support for passthrough plugging
      io_uring: cleanup handling of the two task_work lists

Kanchan Joshi (3):
      nvme: wire-up uring-cmd support for io-passthru on char-device.
      nvme: helper for uring-passthrough checks
      nvme: enable uring-passthrough for admin commands

Ming Lei (1):
      blk-mq: fix passthrough plugging

Stefan Roesch (12):
      io_uring: support CQE32 in io_uring_cqe
      io_uring: store add. return values for CQE32
      io_uring: change ring size calculation for CQE32
      io_uring: add CQE32 setup processing
      io_uring: add CQE32 completion processing
      io_uring: modify io_get_cqe for CQE32
      io_uring: flush completions for CQE32
      io_uring: overflow processing for CQE32
      io_uring: add tracing for additional CQE32 fields
      io_uring: support CQE32 in /proc info
      io_uring: enable CQE32
      io_uring: support CQE32 for nop operation

 block/blk-mq.c                  | 109 ++++----
 drivers/nvme/host/core.c        |   2 +
 drivers/nvme/host/ioctl.c       | 278 +++++++++++++++++++-
 drivers/nvme/host/multipath.c   |   1 +
 drivers/nvme/host/nvme.h        |   5 +
 fs/io_uring.c                   | 444 ++++++++++++++++++++++++++------
 include/linux/fs.h              |   2 +
 include/linux/io_uring.h        |  33 +++
 include/trace/events/io_uring.h |  18 +-
 include/uapi/linux/io_uring.h   |  24 +-
 include/uapi/linux/nvme_ioctl.h |  28 ++
 11 files changed, 806 insertions(+), 138 deletions(-)

-- 
Jens Axboe