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block: Introduce IOPRIO_NR_LEVELS

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The BFQ scheduler and ioprio_check_cap() both assume that the RT
priority class (IOPRIO_CLASS_RT) can have up to 8 different priority
levels, similarly to the BE class (IOPRIO_CLASS_iBE). This is
controlled using the IOPRIO_BE_NR macro , which is badly named as the
number of levels also applies to the RT class.

Introduce the class independent IOPRIO_NR_LEVELS macro, defined to 8,
to make things clear. Keep the old IOPRIO_BE_NR macro definition as an
alias for IOPRIO_NR_LEVELS.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210811033702.368488-6-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal
2021-08-11 12:37:01 +09:00
committed by Jens Axboe
parent ba05200fcc
commit 202bc942c5
6 changed files with 14 additions and 14 deletions
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5
include/uapi/linux/ioprio.h
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@@ -32,9 +32,10 @@ enum {
};
/*
* 8 best effort priority levels are supported
* The RT and BE priority classes both support up to 8 priority levels.
*/
#define IOPRIO_BE_NR (8)
#define IOPRIO_NR_LEVELS 8
#define IOPRIO_BE_NR IOPRIO_NR_LEVELS
enum {
IOPRIO_WHO_PROCESS = 1,