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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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23
block/blk-core.c
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@@ -1321,14 +1321,17 @@ static unsigned long __part_start_io_acct(struct block_device *part,
return now;
}
unsigned long part_start_io_acct(struct gendisk *disk, struct block_device **part,
struct bio *bio)
/**
* 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().
*/
unsigned long bio_start_io_acct(struct bio *bio)
{
*part = disk_map_sector_rcu(disk, bio->bi_iter.bi_sector);
return __part_start_io_acct(*part, bio_sectors(bio), bio_op(bio));
return __part_start_io_acct(bio->bi_bdev, bio_sectors(bio), bio_op(bio));
}
EXPORT_SYMBOL_GPL(part_start_io_acct);
EXPORT_SYMBOL_GPL(bio_start_io_acct);
unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors,
unsigned int op)
@@ -1351,12 +1354,12 @@ static void __part_end_io_acct(struct block_device *part, unsigned int op,
part_stat_unlock();
}
void part_end_io_acct(struct block_device *part, struct bio *bio,
unsigned long start_time)
void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,
struct block_device *orig_bdev)
{
__part_end_io_acct(part, bio_op(bio), start_time);
__part_end_io_acct(orig_bdev, bio_op(bio), start_time);
}
EXPORT_SYMBOL_GPL(part_end_io_acct);
EXPORT_SYMBOL_GPL(bio_end_io_acct_remapped);
void disk_end_io_acct(struct gendisk *disk, unsigned int op,
unsigned long start_time)