[BLOCK] Document the READ/WRITE splitup of the disk stats
Use the symbolic name where appropriate and add a comment to the
disk_stats structure.
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/block/genhd.c b/block/genhd.c
index 54aec4a..f04609d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -391,12 +391,14 @@
"%8u %8u %8llu %8u "
"%8u %8u %8u"
"\n",
- disk_stat_read(disk, ios[0]), disk_stat_read(disk, merges[0]),
- (unsigned long long)disk_stat_read(disk, sectors[0]),
- jiffies_to_msecs(disk_stat_read(disk, ticks[0])),
- disk_stat_read(disk, ios[1]), disk_stat_read(disk, merges[1]),
- (unsigned long long)disk_stat_read(disk, sectors[1]),
- jiffies_to_msecs(disk_stat_read(disk, ticks[1])),
+ disk_stat_read(disk, ios[READ]),
+ disk_stat_read(disk, merges[READ]),
+ (unsigned long long)disk_stat_read(disk, sectors[READ]),
+ jiffies_to_msecs(disk_stat_read(disk, ticks[READ])),
+ disk_stat_read(disk, ios[WRITE]),
+ disk_stat_read(disk, merges[WRITE]),
+ (unsigned long long)disk_stat_read(disk, sectors[WRITE]),
+ jiffies_to_msecs(disk_stat_read(disk, ticks[WRITE])),
disk->in_flight,
jiffies_to_msecs(disk_stat_read(disk, io_ticks)),
jiffies_to_msecs(disk_stat_read(disk, time_in_queue)));
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 8eeaa53..eef5ccd 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -78,7 +78,7 @@
sector_t start_sect;
sector_t nr_sects;
struct kobject kobj;
- unsigned ios[2], sectors[2];
+ unsigned ios[2], sectors[2]; /* READs and WRITEs */
int policy, partno;
};
@@ -89,7 +89,7 @@
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
struct disk_stats {
- unsigned sectors[2];
+ unsigned sectors[2]; /* READs and WRITEs */
unsigned ios[2];
unsigned merges[2];
unsigned ticks[2];
