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io_uring: add support for multishot timeouts

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A multishot timeout submission will repeatedly generate completions with
the IORING_CQE_F_MORE cflag set. Depending on the value of the `off'
field in the submission, these timeouts can either repeat indefinitely
until cancelled (`off' = 0) or for a fixed number of times (`off' > 0).

Only noseq timeouts (i.e. not dependent on the number of I/O
completions) are supported.

An indefinite timer will be cancelled if the CQ ever overflows.

Signed-off-by: David Wei <davidhwei@meta.com>
Link: https://lore.kernel.org/r/20230418225817.1905027-1-davidhwei@meta.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
David Wei
2023-04-18 15:58:18 -07:00
committed by Jens Axboe
parent 2236b3905b
commit ea97f6c855
2 changed files with 55 additions and 3 deletions
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1
include/uapi/linux/io_uring.h
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@@ -250,6 +250,7 @@ enum io_uring_op {
#define IORING_TIMEOUT_REALTIME (1U << 3)
#define IORING_LINK_TIMEOUT_UPDATE (1U << 4)
#define IORING_TIMEOUT_ETIME_SUCCESS (1U << 5)
#define IORING_TIMEOUT_MULTISHOT (1U << 6)
#define IORING_TIMEOUT_CLOCK_MASK (IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME)
#define IORING_TIMEOUT_UPDATE_MASK (IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE)
/*