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io_uring: add support for passing fixed file descriptors

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With IORING_OP_MSG_RING, one ring can send a message to another ring.
Extend that support to also allow sending a fixed file descriptor to
that ring, enabling one ring to pass a registered descriptor to another
one.

Arguments are extended to pass in:

sqe->addr3	fixed file slot in source ring
sqe->file_index	fixed file slot in destination ring

IORING_OP_MSG_RING is extended to take a command argument in sqe->addr.
If set to zero (or IORING_MSG_DATA), it sends just a message like before.
If set to IORING_MSG_SEND_FD, a fixed file descriptor is sent according
to the above arguments.

Two common use cases for this are:

1) Server needs to be shutdown or restarted, pass file descriptors to
   another onei

2) Backend is split, and one accepts connections, while others then get
  the fd passed and handle the actual connection.

Both of those are classic SCM_RIGHTS use cases, and it's not possible to
support them with direct descriptors today.

By default, this will post a CQE to the target ring, similarly to how
IORING_MSG_DATA does it. If IORING_MSG_RING_CQE_SKIP is set, no message
is posted to the target ring. The issuer is expected to notify the
receiver side separately.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-06-13 04:47:02 -06:00
parent f110ed8498
commit e6130eba8a
2 changed files with 140 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

17
include/uapi/linux/io_uring.h
View file

@ -51,6 +51,7 @@ struct io_uring_sqe {
__u32 unlink_flags;
__u32 hardlink_flags;
__u32 xattr_flags;
__u32 msg_ring_flags;
};
__u64 user_data; /* data to be passed back at completion time */
/* pack this to avoid bogus arm OABI complaints */
@ -270,6 +271,22 @@ enum io_uring_op {
*/
#define IORING_ACCEPT_MULTISHOT (1U << 0)
/*
* IORING_OP_MSG_RING command types, stored in sqe->addr
*/
enum {
IORING_MSG_DATA, /* pass sqe->len as 'res' and off as user_data */
IORING_MSG_SEND_FD, /* send a registered fd to another ring */
};
/*
* IORING_OP_MSG_RING flags (sqe->msg_ring_flags)
*
* IORING_MSG_RING_CQE_SKIP Don't post a CQE to the target ring. Not
* applicable for IORING_MSG_DATA, obviously.
*/
#define IORING_MSG_RING_CQE_SKIP (1U << 0)
/*
* IO completion data structure (Completion Queue Entry)
*/