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author | Oliver Hartkopp <socketcan@hartkopp.net> | 2021-07-14 22:56:55 +0300 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-08-02 22:37:27 +0300 |
commit | 06447ae5e33bfbc5a777cc06d9854a31f3912833 (patch) | |
tree | 2ee27a71278f67f46525a2468d02aab48d7488c8 /include/uapi/linux/ioprio.h | |
parent | c500bee1c5b2f1d59b1081ac879d73268ab0ff17 (diff) | |
download | linux-06447ae5e33bfbc5a777cc06d9854a31f3912833.tar.xz |
ioprio: move user space relevant ioprio bits to UAPI includes
systemd added a modified copy of include/linux/ioprio.h into its
code to get the relevant content definitions for the exposed
ioprio_[get|set] system calls.
Move the user space relevant ioprio bits to the UAPI includes to be
able to use the ioprio_[get|set] syscalls as intended.
Cc: Kay Sievers <kay@vrfy.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/r/20210714195655.181943-1-socketcan@hartkopp.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux/ioprio.h')
-rw-r--r-- | include/uapi/linux/ioprio.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/uapi/linux/ioprio.h b/include/uapi/linux/ioprio.h new file mode 100644 index 000000000000..77b17e08b0da --- /dev/null +++ b/include/uapi/linux/ioprio.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _UAPI_LINUX_IOPRIO_H +#define _UAPI_LINUX_IOPRIO_H + +/* + * Gives us 8 prio classes with 13-bits of data for each class + */ +#define IOPRIO_CLASS_SHIFT (13) +#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1) + +#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT) +#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK) +#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data) + +/* + * These are the io priority groups as implemented by CFQ. RT is the realtime + * class, it always gets premium service. BE is the best-effort scheduling + * class, the default for any process. IDLE is the idle scheduling class, it + * is only served when no one else is using the disk. + */ +enum { + IOPRIO_CLASS_NONE, + IOPRIO_CLASS_RT, + IOPRIO_CLASS_BE, + IOPRIO_CLASS_IDLE, +}; + +#define ioprio_valid(mask) (IOPRIO_PRIO_CLASS((mask)) != IOPRIO_CLASS_NONE) + +/* + * 8 best effort priority levels are supported + */ +#define IOPRIO_BE_NR (8) + +enum { + IOPRIO_WHO_PROCESS = 1, + IOPRIO_WHO_PGRP, + IOPRIO_WHO_USER, +}; + +/* + * Fallback BE priority + */ +#define IOPRIO_NORM (4) + +#endif /* _UAPI_LINUX_IOPRIO_H */ |