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block: use ->bi_bdev for bio based I/O accounting

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Rework the I/O accounting for bio based drivers to use ->bi_bdev.  This
means all drivers can now simply use bio_start_io_acct to start
accounting, and it will take partitions into account automatically.  To
end I/O account either bio_end_io_acct can be used if the driver never
remaps I/O to a different device, or bio_end_io_acct_remapped if the
driver did remap the I/O.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-01-24 11:02:37 +01:00 • committed by Jens Axboe
parent 30c5d3456c
commit 99dfc43ecb
4 changed files with 42 additions and 44 deletions
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21
include/linux/blkdev.h
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@ -1954,22 +1954,9 @@ 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 block_device **part, struct bio *bio);
void part_end_io_acct(struct block_device *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
*
* Returns the start time that should be passed back to bio_end_io_acct().
*/
static inline unsigned long bio_start_io_acct(struct bio *bio)
{
return disk_start_io_acct(bio->bi_bdev->bd_disk, bio_sectors(bio),
bio_op(bio));
}
unsigned long bio_start_io_acct(struct bio *bio);
void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
struct block_device *orig_bdev);
/**
* bio_end_io_acct - end I/O accounting for bio based drivers
@ -1978,7 +1965,7 @@ static inline unsigned long bio_start_io_acct(struct bio *bio)
*/
static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)
{
return disk_end_io_acct(bio->bi_bdev->bd_disk, bio_op(bio), start_time);
return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
}
int bdev_read_only(struct block_device *bdev);