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| author | Ming Lei <ming.lei@redhat.com> | 2023-09-28 20:43:25 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-09-28 07:36:00 -0600 |
| commit | 93b8cc60c37b9d17732b7a297e5dca29b50a990d (patch) | |
| tree | 69dc83ff4f33883707fc33fc30ad70cc40638969 /include/linux/io_uring.h | |
| parent | 528ce6781726e022bc5dc84034360e6e8f1b89bd (diff) | |
| download | lwn-93b8cc60c37b9d17732b7a297e5dca29b50a990d.tar.gz lwn-93b8cc60c37b9d17732b7a297e5dca29b50a990d.zip | |
io_uring: cancelable uring_cmd
uring_cmd may never complete, such as ublk, in which uring cmd isn't
completed until one new block request is coming from ublk block device.
Add cancelable uring_cmd to provide mechanism to driver for cancelling
pending commands in its own way.
Add API of io_uring_cmd_mark_cancelable() for driver to mark one command as
cancelable, then io_uring will cancel this command in
io_uring_cancel_generic(). ->uring_cmd() callback is reused for canceling
command in driver's way, then driver gets notified with the cancelling
from io_uring.
Add API of io_uring_cmd_get_task() to help driver cancel handler
deal with the canceling.
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Suggested-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/io_uring.h')
| -rw-r--r-- | include/linux/io_uring.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/io_uring.h b/include/linux/io_uring.h index ae08d6f66e62..b4391e0a9bc8 100644 --- a/include/linux/io_uring.h +++ b/include/linux/io_uring.h @@ -20,9 +20,13 @@ enum io_uring_cmd_flags { IO_URING_F_SQE128 = (1 << 8), IO_URING_F_CQE32 = (1 << 9), IO_URING_F_IOPOLL = (1 << 10), + + /* set when uring wants to cancel a previously issued command */ + IO_URING_F_CANCEL = (1 << 11), }; /* only top 8 bits of sqe->uring_cmd_flags for kernel internal use */ +#define IORING_URING_CMD_CANCELABLE (1U << 30) #define IORING_URING_CMD_POLLED (1U << 31) struct io_uring_cmd { @@ -85,6 +89,9 @@ static inline void io_uring_free(struct task_struct *tsk) __io_uring_free(tsk); } int io_uring_cmd_sock(struct io_uring_cmd *cmd, unsigned int issue_flags); +void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, + unsigned int issue_flags); +struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd); #else static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw, struct iov_iter *iter, void *ioucmd) @@ -125,6 +132,14 @@ static inline int io_uring_cmd_sock(struct io_uring_cmd *cmd, { return -EOPNOTSUPP; } +static inline void io_uring_cmd_mark_cancelable(struct io_uring_cmd *cmd, + unsigned int issue_flags) +{ +} +static inline struct task_struct *io_uring_cmd_get_task(struct io_uring_cmd *cmd) +{ + return NULL; +} #endif #endif |