commit 48ac0a4df84662f23da25262443e1810b70c2228
author Wen Congyang <wency@cn.fujitsu.com> Fri May 15 15:51:36 2015 +0800
committer Jeff Cody <jcody@redhat.com> Tue Jul 14 21:50:13 2015 -0400
tree 16ae278a96c3b019ab94d0b7b0889043a718d649
parent 17d9716d7b5381c4b6566bb1a06267d2bfcd1821

mirror: correct buf_size

If bus_size is less than 0, the command fails.
If buf_size is 0, use DEFAULT_MIRROR_BUF_SIZE.
If buf_size % granularity is not 0, mirror_free_init() will
do dangerous things.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 5555A588.3080907@cn.fujitsu.com
Signed-off-by: Jeff Cody <jcody@redhat.com>

block/mirror.c

diff --git a/block/mirror.c b/block/mirror.c
index a2700ca..323f747 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -20,6 +20,7 @@
 
 #define SLICE_TIME    100000000ULL /* ns */
 #define MAX_IN_FLIGHT 16
+#define DEFAULT_MIRROR_BUF_SIZE   (10 << 20)
 
 /* The mirroring buffer is a list of granularity-sized chunks.
  * Free chunks are organized in a list.
@@ -701,6 +702,14 @@
         return;
     }
 
+    if (buf_size < 0) {
+        error_setg(errp, "Invalid parameter 'buf-size'");
+        return;
+    }
+
+    if (buf_size == 0) {
+        buf_size = DEFAULT_MIRROR_BUF_SIZE;
+    }
 
     s = block_job_create(driver, bs, speed, cb, opaque, errp);
     if (!s) {
@@ -714,7 +723,7 @@
     s->is_none_mode = is_none_mode;
     s->base = base;
     s->granularity = granularity;
-    s->buf_size = MAX(buf_size, granularity);
+    s->buf_size = ROUND_UP(buf_size, granularity);
     s->unmap = unmap;
 
     s->dirty_bitmap = bdrv_create_dirty_bitmap(bs, granularity, NULL, errp);