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block: move stats from disk to part0

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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
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12
drivers/block/aoe/aoecmd.c
View file

@ -758,15 +758,15 @@ diskstats(struct gendisk *disk, struct bio *bio, ulong duration, sector_t sector
struct hd_struct *part;
int cpu;
cpu = disk_stat_lock();
cpu = part_stat_lock();
part = disk_map_sector_rcu(disk, sector);
all_stat_inc(cpu, disk, part, ios[rw], sector);
all_stat_add(cpu, disk, part, ticks[rw], duration, sector);
all_stat_add(cpu, disk, part, sectors[rw], n_sect, sector);
all_stat_add(cpu, disk, part, io_ticks, duration, sector);
part_stat_inc(cpu, part, ios[rw]);
part_stat_add(cpu, part, ticks[rw], duration);
part_stat_add(cpu, part, sectors[rw], n_sect);
part_stat_add(cpu, part, io_ticks, duration);
disk_stat_unlock();
part_stat_unlock();
}
void