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block: introduce part_[begin|end]_io_acct

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These functions can be used to enable iostat for partitions on devices
like md, bcache.

Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Song Liu
2020-08-31 15:27:23 -07:00
committed by Jens Axboe
parent 285008501c
commit 7b26410b05
2 changed files with 38 additions and 6 deletions
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5
include/linux/blkdev.h
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@@ -1933,6 +1933,11 @@ unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time);
unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part,
struct bio *bio);
void part_end_io_acct(struct hd_struct *part, struct bio *bio,
unsigned long start_time);
/**
* bio_start_io_acct - start I/O accounting for bio based drivers
* @bio: bio to start account for