diff options
| author | Jens Axboe <axboe@kernel.dk> | 2019-04-06 21:51:27 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-05-02 14:08:53 -0600 |
| commit | de0617e467171ba44c73efd1ba63f101b164a035 (patch) | |
| tree | f0d4a88d22ee63d0d2270249ed516b4135b92c43 /include/uapi/linux | |
| parent | ea9866793d1e925b4d320eaea409263b2a568f38 (diff) | |
io_uring: add support for marking commands as draining
There are no ordering constraints between the submission and completion
side of io_uring. But sometimes that would be useful to have. One common
example is doing an fsync, for instance, and have it ordered with
previous writes. Without support for that, the application must do this
tracking itself.
This adds a general SQE flag, IOSQE_IO_DRAIN. If a command is marked
with this flag, then it will not be issued before previous commands have
completed, and subsequent commands submitted after the drain will not be
issued before the drain is started.. If there are no pending commands,
setting this flag will not change the behavior of the issue of the
command.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/io_uring.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/io_uring.h b/include/uapi/linux/io_uring.h index e23408692118..a7a6384d0c70 100644 --- a/include/uapi/linux/io_uring.h +++ b/include/uapi/linux/io_uring.h @@ -38,6 +38,7 @@ struct io_uring_sqe { * sqe->flags */ #define IOSQE_FIXED_FILE (1U << 0) /* use fixed fileset */ +#define IOSQE_IO_DRAIN (1U << 1) /* issue after inflight IO */ /* * io_uring_setup() flags |