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block: move stats from disk to part0

Browse source 
Move stats related fields - stamp, in_flight, dkstats - from disk to
part0 and unify stat handling such that...

* part_stat_*() now updates part0 together if the specified partition
  is not part0.  ie. part_stat_*() are now essentially all_stat_*().

* {disk|all}_stat_*() are gone.

* part_round_stats() is updated similary.  It handles part0 stats
  automatically and disk_round_stats() is killed.

* part_{inc|dec}_in_fligh() is implemented which automatically updates
  part0 stats for parts other than part0.

* disk_map_sector_rcu() is updated to return part0 if no part matches.
  Combined with the above changes, this makes NULL special case
  handling in callers unnecessary.

* Separate stats show code paths for disk are collapsed into part
  stats show code paths.

* Rename disk_stat_lock/unlock() to part_stat_lock/unlock()

While at it, reposition stat handling macros a bit and add missing
parentheses around macro parameters.

Signed-off-by: Tejun Heo <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2008-08-25 19:56:14 +09:00 • committed by Jens Axboe
commit 074a7aca7a
14 changed files with 165 additions and 296 deletions
Download patch file Download diff file Expand all files Collapse all files

27
drivers/md/dm.c
View file

@ -381,10 +381,10 @@ static void start_io_acct(struct dm_io *io)
io->start_time = jiffies;
cpu = disk_stat_lock();
disk_round_stats(cpu, dm_disk(md));
disk_stat_unlock();
dm_disk(md)->in_flight = atomic_inc_return(&md->pending);
cpu = part_stat_lock();
part_round_stats(cpu, &dm_disk(md)->part0);
part_stat_unlock();
dm_disk(md)->part0.in_flight = atomic_inc_return(&md->pending);
}
static int end_io_acct(struct dm_io *io)
@ -395,12 +395,13 @@ static int end_io_acct(struct dm_io *io)
int pending, cpu;
int rw = bio_data_dir(bio);
cpu = disk_stat_lock();
disk_round_stats(cpu, dm_disk(md));
disk_stat_add(cpu, dm_disk(md), ticks[rw], duration);
disk_stat_unlock();
cpu = part_stat_lock();
part_round_stats(cpu, &dm_disk(md)->part0);
part_stat_add(cpu, &dm_disk(md)->part0, ticks[rw], duration);
part_stat_unlock();
dm_disk(md)->in_flight = pending = atomic_dec_return(&md->pending);
dm_disk(md)->part0.in_flight = pending =
atomic_dec_return(&md->pending);
return !pending;
}
@ -899,10 +900,10 @@ static int dm_request(struct request_queue *q, struct bio *bio)
down_read(&md->io_lock);
cpu = disk_stat_lock();
disk_stat_inc(cpu, dm_disk(md), ios[rw]);
disk_stat_add(cpu, dm_disk(md), sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &dm_disk(md)->part0, ios[rw]);
part_stat_add(cpu, &dm_disk(md)->part0, sectors[rw], bio_sectors(bio));
part_stat_unlock();
/*
* If we're suspended we have to queue

9
drivers/md/linear.c
View file

@ -325,10 +325,11 @@ static int linear_make_request (struct request_queue *q, struct bio *bio)
return 0;
}
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
tmp_dev = which_dev(mddev, bio->bi_sector);
block = bio->bi_sector >> 1;

4
drivers/md/md.c
View file

@ -5546,8 +5546,8 @@ static int is_mddev_idle(mddev_t *mddev)
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev) {
struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
curr_events = disk_stat_read(disk, sectors[0]) +
disk_stat_read(disk, sectors[1]) -
curr_events = part_stat_read(&disk->part0, sectors[0]) +
part_stat_read(&disk->part0, sectors[1]) -
atomic_read(&disk->sync_io);
/* sync IO will cause sync_io to increase before the disk_stats
* as sync_io is counted when a request starts, and

9
drivers/md/multipath.c
View file

@ -159,10 +159,11 @@ static int multipath_make_request (struct request_queue *q, struct bio * bio)
mp_bh->master_bio = bio;
mp_bh->mddev = mddev;
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
mp_bh->path = multipath_map(conf);
if (mp_bh->path < 0) {

9
drivers/md/raid0.c
View file

@ -406,10 +406,11 @@ static int raid0_make_request (struct request_queue *q, struct bio *bio)
return 0;
}
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
chunk_size = mddev->chunk_size >> 10;
chunk_sects = mddev->chunk_size >> 9;

9
drivers/md/raid1.c
View file

@ -804,10 +804,11 @@ static int make_request(struct request_queue *q, struct bio * bio)
bitmap = mddev->bitmap;
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
/*
* make_request() can abort the operation when READA is being

9
drivers/md/raid10.c
View file

@ -844,10 +844,11 @@ static int make_request(struct request_queue *q, struct bio * bio)
*/
wait_barrier(conf);
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bio));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bio));
part_stat_unlock();
r10_bio = mempool_alloc(conf->r10bio_pool, GFP_NOIO);

9
drivers/md/raid5.c
View file

@ -3396,10 +3396,11 @@ static int make_request(struct request_queue *q, struct bio * bi)
md_write_start(mddev, bi);
cpu = disk_stat_lock();
disk_stat_inc(cpu, mddev->gendisk, ios[rw]);
disk_stat_add(cpu, mddev->gendisk, sectors[rw], bio_sectors(bi));
disk_stat_unlock();
cpu = part_stat_lock();
part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]);
part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw],
bio_sectors(bi));
part_stat_unlock();
if (rw == READ &&
mddev->reshape_position == MaxSector &&