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io_uring: allow IORING_OP_ASYNC_CANCEL with 'fd' key

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Currently sqe->addr must contain the user_data of the request being
canceled. Introduce the IORING_ASYNC_CANCEL_FD flag, which tells the
kernel that we're keying off the file fd instead for cancelation. This
allows canceling any request that a) uses a file, and b) was assigned the
file based on the value being passed in.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20220418164402.75259-5-axboe@kernel.dk
This commit is contained in:
Jens Axboe 2022-04-18 10:44:01 -06:00
parent 8e29da69fe
commit 4bf94615b8
2 changed files with 63 additions and 7 deletions
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3
include/uapi/linux/io_uring.h
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@ -191,8 +191,11 @@ enum {
* ASYNC_CANCEL flags.
*
* IORING_ASYNC_CANCEL_ALL Cancel all requests that match the given key
* IORING_ASYNC_CANCEL_FD Key off 'fd' for cancelation rather than the
* request 'user_data'
*/
#define IORING_ASYNC_CANCEL_ALL (1U << 0)
#define IORING_ASYNC_CANCEL_FD (1U << 1)
/*
* IO completion data structure (Completion Queue Entry)