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block: Introduce get_current_ioprio()

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Define get_current_ioprio() as an inline helper to obtain the caller
I/O priority from its task I/O context. Use this helper in
blk_init_request_from_bio() to set a request ioprio.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2018-11-20 10:52:35 +09:00 • committed by Jens Axboe
parent e2b3fa5af7
commit 64845a1ddd
2 changed files with 14 additions and 5 deletions
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13
include/linux/ioprio.h
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@ -70,6 +70,19 @@ static inline int task_nice_ioclass(struct task_struct *task)
return IOPRIO_CLASS_BE;
}
/*
* If the calling process has set an I/O priority, use that. Otherwise, return
* the default I/O priority.
*/
static inline int get_current_ioprio(void)
{
struct io_context *ioc = current->io_context;
if (ioc)
return ioc->ioprio;
return IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
}
/*
* For inheritance, return the highest of the two given priorities
*/