[PATCH 2.6.11] aoe [11/12]: add support for disk statistics

[ecashin@noserose.net]

add support for disk statistics

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>

diff -uprN a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
--- a/drivers/block/aoe/aoe.h	2005-03-10 12:19:54.000000000 -0500
+++ b/drivers/block/aoe/aoe.h	2005-03-10 12:20:02.000000000 -0500
@@ -91,6 +91,7 @@ enum {
 
 struct buf {
 	struct list_head bufs;
+	ulong start_time;	/* for disk stats */
 	ulong flags;
 	ulong nframesout;
 	char *bufaddr;
diff -uprN a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
--- a/drivers/block/aoe/aoeblk.c	2005-03-10 12:20:00.000000000 -0500
+++ b/drivers/block/aoe/aoeblk.c	2005-03-10 12:20:02.000000000 -0500
@@ -125,6 +125,7 @@ aoeblk_make_request(request_queue_t *q, 
 	}
 	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 -uprN a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
--- a/drivers/block/aoe/aoecmd.c	2005-03-10 12:19:27.000000000 -0500
+++ b/drivers/block/aoe/aoecmd.c	2005-03-10 12:20:02.000000000 -0500
@@ -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);


-- 
  Ed L. Cashin <ecashin@coraid.com>
-
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