From: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Date: Mon, 16 May 2011 12:56:53 +0000 (+0100)
Subject: qed: support for growing images
X-Git-Tag: TizenStudio_2.0_p2.3~2726
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9bf0073bf9765a616628a1b8d95246115a5f7a9a;p=sdk%2Femulator%2Fqemu.git

qed: support for growing images

The .bdrv_truncate() operation resizes images and growing is easy to
implement in QED.  Simply check that the new size is valid and then
update the image_size header field to reflect the new size.

Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---

diff --git a/block/qed.c b/block/qed.c
index d8d6ea2..da0bf31 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1333,7 +1333,27 @@ static BlockDriverAIOCB *bdrv_qed_aio_flush(BlockDriverState *bs,
 
 static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset)
 {
-    return -ENOTSUP;
+    BDRVQEDState *s = bs->opaque;
+    uint64_t old_image_size;
+    int ret;
+
+    if (!qed_is_image_size_valid(offset, s->header.cluster_size,
+                                 s->header.table_size)) {
+        return -EINVAL;
+    }
+
+    /* Shrinking is currently not supported */
+    if ((uint64_t)offset < s->header.image_size) {
+        return -ENOTSUP;
+    }
+
+    old_image_size = s->header.image_size;
+    s->header.image_size = offset;
+    ret = qed_write_header_sync(s);
+    if (ret < 0) {
+        s->header.image_size = old_image_size;
+    }
+    return ret;
 }
 
 static int64_t bdrv_qed_getlength(BlockDriverState *bs)