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io-wq: provide IO_WQ_* constants for IORING_REGISTER_IOWQ_MAX_WORKERS arg items

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The items passed in the array pointed by the arg parameter
of IORING_REGISTER_IOWQ_MAX_WORKERS io_uring_register operation
carry certain semantics: they refer to different io-wq worker categories;
provide IO_WQ_* constants in the UAPI, so these categories can be referenced
in the user space code.

Suggested-by: Jens Axboe <axboe@kernel.dk>
Complements: 2e480058dd ("io-wq: provide a way to limit max number of workers")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Link: https://lore.kernel.org/r/20210913154415.GA12890@asgard.redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Eugene Syromiatnikov
2021-09-13 17:44:15 +02:00
committed by Jens Axboe
parent 767a65e9f3
commit dd47c10453
2 changed files with 12 additions and 1 deletions
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8
include/uapi/linux/io_uring.h
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@@ -317,13 +317,19 @@ enum {
IORING_REGISTER_IOWQ_AFF = 17,
IORING_UNREGISTER_IOWQ_AFF = 18,
/* set/get max number of workers */
/* set/get max number of io-wq workers */
IORING_REGISTER_IOWQ_MAX_WORKERS = 19,
/* this goes last */
IORING_REGISTER_LAST
};
/* io-wq worker categories */
enum {
IO_WQ_BOUND,
IO_WQ_UNBOUND,
};
/* deprecated, see struct io_uring_rsrc_update */
struct io_uring_files_update {
__u32 offset;