[PATCH] pktcdvd: more accurate I/O accounting

In the /proc statistics, only count writes that upper layers have requested.
Don't count additional writes created inside the packet driver to satisfy the
requirement to only write full packets.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index aacf5cfccada..109db859112a 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -736,12 +736,6 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
         atomic_set(&pkt->io_wait, 0);
         atomic_set(&pkt->io_errors, 0);
 
-        if (pkt->cache_valid) {
-                VPRINTK("pkt_gather_data: zone %llx cached\n",
-                        (unsigned long long)pkt->sector);
-                goto out_account;
-        }
-
         /*
          * Figure out which frames we need to read before we can write.
          */
@@ -750,6 +744,7 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
         for (bio = pkt->orig_bios; bio; bio = bio->bi_next) {
                 int first_frame = (bio->bi_sector - pkt->sector) / (CD_FRAMESIZE >> 9);
                 int num_frames = bio->bi_size / CD_FRAMESIZE;
+                pd->stats.secs_w += num_frames * (CD_FRAMESIZE >> 9);
                 BUG_ON(first_frame < 0);
                 BUG_ON(first_frame + num_frames > pkt->frames);
                 for (f = first_frame; f < first_frame + num_frames; f++)
@@ -757,6 +752,12 @@ static void pkt_gather_data(struct pktcdvd_device *pd, struct packet_data *pkt)
         }
         spin_unlock(&pkt->lock);
 
+        if (pkt->cache_valid) {
+                VPRINTK("pkt_gather_data: zone %llx cached\n",
+                        (unsigned long long)pkt->sector);
+                goto out_account;
+        }
+
         /*
          * Schedule reads for missing parts of the packet.
          */
@@ -790,7 +791,6 @@ out_account:
                 frames_read, (unsigned long long)pkt->sector);
         pd->stats.pkt_started++;
         pd->stats.secs_rg += frames_read * (CD_FRAMESIZE >> 9);
-        pd->stats.secs_w += pd->settings.size;
 }
 
 /*