[PATCH] aoe 11/12: add support for disk statistics

add support for disk statistics

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 16 insertions, 0 deletions

diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index d3b0e2ca151..2e92cfb4997 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -90,6 +90,7 @@ enum {
 
 struct buf {
         struct list_head bufs;
+        ulong start_time;       /* for disk stats */
         ulong flags;
         ulong nframesout;
         char *bufaddr;
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 63561b280bc..a2735d97584 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -125,6 +125,7 @@ aoeblk_make_request(request_queue_t *q, struct bio *bio)
         }
         memset(buf, 0, sizeof(*buf));
         INIT_LIST_HEAD(&buf->bufs);
+        buf->start_time = jiffies;
         buf->bio = bio;
         buf->resid = bio->bi_size;
         buf->sector = bio->bi_sector;
diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index f810bd6bf87..60beb8db461 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -456,6 +456,20 @@ aoecmd_ata_rsp(struct sk_buff *skb)
         if (buf) {
                 buf->nframesout -= 1;
                 if (buf->nframesout == 0 && buf->resid == 0) {
+                        unsigned long duration = jiffies - buf->start_time;
+                        unsigned long n_sect = buf->bio->bi_size >> 9;
+                        struct gendisk *disk = d->gd;
+
+                        if (bio_data_dir(buf->bio) == WRITE) {
+                                disk_stat_inc(disk, writes);
+                                disk_stat_add(disk, write_ticks, duration);
+                                disk_stat_add(disk, write_sectors, n_sect);
+                        } else {
+                                disk_stat_inc(disk, reads);
+                                disk_stat_add(disk, read_ticks, duration);
+                                disk_stat_add(disk, read_sectors, n_sect);
+                        }
+                        disk_stat_add(disk, io_ticks, duration);
                         n = (buf->flags & BUFFL_FAIL) ? -EIO : 0;
                         bio_endio(buf->bio, buf->bio->bi_size, n);
                         mempool_free(buf, d->bufpool);