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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
View File

@ -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)

34
drivers/md/bcache/request.c
View File

@ -475,7 +475,7 @@ struct search {
unsigned int read_dirty_data:1;
unsigned int cache_missed:1;
struct block_device *part;
struct block_device *orig_bdev;
unsigned long start_time;
struct btree_op op;
@ -670,8 +670,8 @@ static void bio_complete(struct search *s)
{
if (s->orig_bio) {
/* Count on bcache device */
part_end_io_acct(s->part, s->orig_bio, s->start_time);
bio_end_io_acct_remapped(s->orig_bio, s->start_time,
s->orig_bdev);
trace_bcache_request_end(s->d, s->orig_bio);
s->orig_bio->bi_status = s->iop.status;
bio_endio(s->orig_bio);
@ -714,7 +714,8 @@ static void search_free(struct closure *cl)
}
static inline struct search *search_alloc(struct bio *bio,
struct bcache_device *d)
struct bcache_device *d, struct block_device *orig_bdev,
unsigned long start_time)
{
struct search *s;
@ -732,7 +733,8 @@ static inline struct search *search_alloc(struct bio *bio,
s->write = op_is_write(bio_op(bio));
s->read_dirty_data = 0;
/* Count on the bcache device */
s->start_time = part_start_io_acct(d->disk, &s->part, bio);
s->orig_bdev = orig_bdev;
s->start_time = start_time;
s->iop.c = d->c;
s->iop.bio = NULL;
s->iop.inode = d->id;
@ -1074,7 +1076,7 @@ struct detached_dev_io_private {
unsigned long start_time;
bio_end_io_t *bi_end_io;
void *bi_private;
struct block_device *part;
struct block_device *orig_bdev;
};
static void detached_dev_end_io(struct bio *bio)
@ -1086,7 +1088,7 @@ static void detached_dev_end_io(struct bio *bio)
bio->bi_private = ddip->bi_private;
/* Count on the bcache device */
part_end_io_acct(ddip->part, bio, ddip->start_time);
bio_end_io_acct_remapped(bio, ddip->start_time, ddip->orig_bdev);
if (bio->bi_status) {
struct cached_dev *dc = container_of(ddip->d,
@ -1099,7 +1101,8 @@ static void detached_dev_end_io(struct bio *bio)
bio->bi_end_io(bio);
}
static void detached_dev_do_request(struct bcache_device *d, struct bio *bio)
static void detached_dev_do_request(struct bcache_device *d, struct bio *bio,
struct block_device *orig_bdev, unsigned long start_time)
{
struct detached_dev_io_private *ddip;
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
@ -1112,7 +1115,8 @@ static void detached_dev_do_request(struct bcache_device *d, struct bio *bio)
ddip = kzalloc(sizeof(struct detached_dev_io_private), GFP_NOIO);
ddip->d = d;
/* Count on the bcache device */
ddip->start_time = part_start_io_acct(d->disk, &ddip->part, bio);
ddip->orig_bdev = orig_bdev;
ddip->start_time = start_time;
ddip->bi_end_io = bio->bi_end_io;
ddip->bi_private = bio->bi_private;
bio->bi_end_io = detached_dev_end_io;
@ -1168,8 +1172,10 @@ static void quit_max_writeback_rate(struct cache_set *c,
blk_qc_t cached_dev_submit_bio(struct bio *bio)
{
struct search *s;
struct bcache_device *d = bio->bi_bdev->bd_disk->private_data;
struct block_device *orig_bdev = bio->bi_bdev;
struct bcache_device *d = orig_bdev->bd_disk->private_data;
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
unsigned long start_time;
int rw = bio_data_dir(bio);
if (unlikely((d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags)) ||
@ -1194,11 +1200,13 @@ blk_qc_t cached_dev_submit_bio(struct bio *bio)
}
}
start_time = bio_start_io_acct(bio);
bio_set_dev(bio, dc->bdev);
bio->bi_iter.bi_sector += dc->sb.data_offset;
if (cached_dev_get(dc)) {
s = search_alloc(bio, d);
s = search_alloc(bio, d, orig_bdev, start_time);
trace_bcache_request_start(s->d, bio);
if (!bio->bi_iter.bi_size) {
@ -1219,7 +1227,7 @@ blk_qc_t cached_dev_submit_bio(struct bio *bio)
}
} else
/* I/O request sent to backing device */
detached_dev_do_request(d, bio);
detached_dev_do_request(d, bio, orig_bdev, start_time);
return BLK_QC_T_NONE;
}
@ -1283,7 +1291,7 @@ blk_qc_t flash_dev_submit_bio(struct bio *bio)
return BLK_QC_T_NONE;
}
s = search_alloc(bio, d);
s = search_alloc(bio, d, bio->bi_bdev, bio_start_io_acct(bio));
cl = &s->cl;
bio = &s->bio.bio;

8
drivers/md/md.c
View File

@ -463,8 +463,8 @@ struct md_io {
struct mddev *mddev;
bio_end_io_t *orig_bi_end_io;
void *orig_bi_private;
struct block_device *orig_bi_bdev;
unsigned long start_time;
struct block_device *part;
};
static void md_end_io(struct bio *bio)
@ -472,7 +472,7 @@ static void md_end_io(struct bio *bio)
struct md_io *md_io = bio->bi_private;
struct mddev *mddev = md_io->mddev;
part_end_io_acct(md_io->part, bio, md_io->start_time);
bio_end_io_acct_remapped(bio, md_io->start_time, md_io->orig_bi_bdev);
bio->bi_end_io = md_io->orig_bi_end_io;
bio->bi_private = md_io->orig_bi_private;
@ -514,12 +514,12 @@ static blk_qc_t md_submit_bio(struct bio *bio)
md_io->mddev = mddev;
md_io->orig_bi_end_io = bio->bi_end_io;
md_io->orig_bi_private = bio->bi_private;
md_io->orig_bi_bdev = bio->bi_bdev;
bio->bi_end_io = md_end_io;
bio->bi_private = md_io;
md_io->start_time = part_start_io_acct(mddev->gendisk,
&md_io->part, bio);
md_io->start_time = bio_start_io_acct(bio);
}
/* bio could be mergeable after passing to underlayer */

21
include/linux/blkdev.h
View File

@ -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);