block: move stats from disk to part0
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 <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 6378066..327de03 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -381,10 +381,10 @@
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 @@
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 @@
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