Index: block.c
===================================================================
RCS file: /sources/qemu/qemu/block.c,v
retrieving revision 1.47
diff -u -r1.47 block.c
--- block.c	11 Nov 2007 02:51:16 -0000	1.47
+++ block.c	16 Nov 2007 15:23:44 -0000
@@ -522,8 +522,12 @@
             return ret;
         else if (ret != len)
             return -EINVAL;
-        else
+        else {
+	    bs->rd_bytes += (unsigned) len;
+	    bs->rd_sects += (unsigned) nb_sectors;
+	    bs->rd_ops ++;
             return 0;
+	}
     } else {
         return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
     }
@@ -554,8 +558,12 @@
             return ret;
         else if (ret != len)
             return -EIO;
-        else
+        else {
+	    bs->wr_bytes += (unsigned) len;
+	    bs->wr_sects += (unsigned) nb_sectors;
+	    bs->wr_ops ++;
             return 0;
+	}
     } else {
         return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
     }
@@ -903,6 +911,27 @@
         term_printf("\n");
     }
 }
+
+/* The "info blockstats" command. */
+void bdrv_info_stats (void)
+{
+    BlockDriverState *bs;
+
+    for (bs = bdrv_first; bs != NULL; bs = bs->next) {
+	term_printf ("%s:"
+		     " rd(bytes)=%" PRIu64
+		     " wr(bytes)=%" PRIu64
+		     " rd(sectors)=%" PRIu64
+		     " wr(sectors)=%" PRIu64
+		     " rd(operations)=%" PRIu64
+		     " wr(operations)=%" PRIu64
+		     "\n",
+		     bs->device_name,
+		     bs->rd_bytes, bs->wr_bytes,
+		     bs->rd_sects, bs->wr_sects,
+		     bs->rd_ops, bs->wr_ops);
+    }
+}
 #endif
 
 void bdrv_get_backing_filename(BlockDriverState *bs,
@@ -1065,6 +1094,7 @@
                                 BlockDriverCompletionFunc *cb, void *opaque)
 {
     BlockDriver *drv = bs->drv;
+    BlockDriverAIOCB *ret;
 
     if (!drv)
         return NULL;
@@ -1077,7 +1107,16 @@
         buf += 512;
     }
 
-    return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
+    ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
+
+    if (ret) {
+	/* Update stats even though technically transfer has not happened. */
+	bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
+	bs->rd_sects += (unsigned) nb_sectors;
+	bs->rd_ops ++;
+    }
+
+    return ret;
 }
 
 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
@@ -1085,6 +1124,7 @@
                                  BlockDriverCompletionFunc *cb, void *opaque)
 {
     BlockDriver *drv = bs->drv;
+    BlockDriverAIOCB *ret;
 
     if (!drv)
         return NULL;
@@ -1094,7 +1134,16 @@
         memcpy(bs->boot_sector_data, buf, 512);
     }
 
-    return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
+    ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
+
+    if (ret) {
+	/* Update stats even though technically transfer has not happened. */
+	bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
+	bs->wr_sects += (unsigned) nb_sectors;
+	bs->wr_ops ++;
+    }
+
+    return ret;
 }
 
 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
Index: block.h
===================================================================
RCS file: /sources/qemu/qemu/block.h,v
retrieving revision 1.1
diff -u -r1.1 block.h
--- block.h	11 Nov 2007 02:51:16 -0000	1.1
+++ block.h	16 Nov 2007 15:23:44 -0000
@@ -48,6 +48,7 @@
 
 #ifndef QEMU_IMG
 void bdrv_info(void);
+void bdrv_info_stats(void);
 #endif
 
 void bdrv_init(void);
Index: block_int.h
===================================================================
RCS file: /sources/qemu/qemu/block_int.h,v
retrieving revision 1.14
diff -u -r1.14 block_int.h
--- block_int.h	11 Nov 2007 02:51:16 -0000	1.14
+++ block_int.h	16 Nov 2007 15:23:44 -0000
@@ -114,6 +114,14 @@
 
     void *sync_aiocb;
 
+    /* I/O stats (display with "info blockstats"). */
+    uint64_t rd_bytes;
+    uint64_t wr_bytes;
+    uint64_t rd_sects;
+    uint64_t wr_sects;
+    uint64_t rd_ops;
+    uint64_t wr_ops;
+
     /* NOTE: the following infos are only hints for real hardware
        drivers. They are not used by the block driver */
     int cyls, heads, secs, translation;
Index: monitor.c
===================================================================
RCS file: /sources/qemu/qemu/monitor.c,v
retrieving revision 1.85
diff -u -r1.85 monitor.c
--- monitor.c	26 Oct 2007 18:42:57 -0000	1.85
+++ monitor.c	16 Nov 2007 15:23:46 -0000
@@ -249,6 +249,11 @@
     bdrv_info();
 }
 
+static void do_info_blockstats(void)
+{
+    bdrv_info_stats();
+}
+
 /* get the current CPU defined by the user */
 int mon_set_cpu(int cpu_index)
 {
@@ -1321,6 +1326,8 @@
       "", "show the network state" },
     { "block", "", do_info_block,
       "", "show the block devices" },
+    { "blockstats", "", do_info_blockstats,
+      "", "show block device statistics" },
     { "registers", "", do_info_registers,
       "", "show the cpu registers" },
     { "cpus", "", do_info_cpus,