[PATCHSET v2 0/3] Add support for multishot reads

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We support multishot for other request types, generally in the shape of
a flag for the request. Doing a flag based approach with reads isn't
straightforward, as the read/write flags are in the RWF_ space. Instead,
add a separate opcode for this, IORING_OP_READ_MULTISHOT.

This can only be used provided buffers, like other multishot request
types that read/receive data.

It can also only be used for pollable file types, like a tun device or
pipes, for example. File types that are always readable (or seekable),
like regular files, cannot be used with multishot reads.

This is based on the io_uring-futex branch (which, in turn, is based on
the io_uring-waitid branch). No dependencies as such between them,
except the opcode numbering.

Can also be found here:


and there's a liburing branch with some basic support and some test
cases here:


 include/uapi/linux/io_uring.h |  1 +
 io_uring/opdef.c              | 14 ++++++
 io_uring/opdef.h              |  2 +
 io_uring/rw.c                 | 92 ++++++++++++++++++++++++++++++++---
 io_uring/rw.h                 |  2 +
 5 files changed, 105 insertions(+), 6 deletions(-)

Changes since v1:
- Code reformatting
- Add/expand a few comments

Jens Axboe

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