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/block/blk-merge.c b/block/blk-merge.c
index d926a24..c77196d 100644
--- a/block/blk-merge.c
+++ b/block/blk-merge.c
@@ -390,17 +390,13 @@
struct hd_struct *part;
int cpu;
- cpu = disk_stat_lock();
+ cpu = part_stat_lock();
part = disk_map_sector_rcu(req->rq_disk, req->sector);
- disk_round_stats(cpu, req->rq_disk);
- req->rq_disk->in_flight--;
- if (part) {
- part_round_stats(cpu, part);
- part->in_flight--;
- }
+ part_round_stats(cpu, part);
+ part_dec_in_flight(part);
- disk_stat_unlock();
+ part_stat_unlock();
}
req->ioprio = ioprio_best(req->ioprio, next->ioprio);
