[Qemu-devel] [RFC 15/24] qcow2: split up the creation of new refcount table from the act of checking it

[Devin Nakamura]

Signed-off-by: Devin Nakamura <devin...@gmail.com>
---
 block/qcow2-refcount.c |   39 +++++++++++++++++++++++++++++----------
 1 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 14b2f67..75f1f88 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1075,17 +1075,10 @@ fail:
     return -EIO;
 }
 
-/*
- * Checks an image for refcount consistency.
- *
- * Returns 0 if no errors are found, the number of errors in case the image is
- * detected as corrupted, and -errno when an internal error occurred.
- */
-int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res)
-{
+static int inc_refcount_table(BlockDriverState *bs, BdrvCheckResult *res, 
uint16_t **table) {
     BDRVQcowState *s = bs->opaque;
     int64_t size;
-    int nb_clusters, refcount1, refcount2, i;
+    int nb_clusters, i;
     QCowSnapshot *sn;
     uint16_t *refcount_table;
     int ret;
@@ -1151,6 +1144,33 @@ int qcow2_check_refcounts(BlockDriverState *bs, 
BdrvCheckResult *res)
             }
         }
     }
+    *table = refcount_table;
+    ret = 0;
+
+fail:
+    return ret;
+}
+
+/*
+ * Checks an image for refcount consistency.
+ *
+ * Returns 0 if no errors are found, the number of errors in case the image is
+ * detected as corrupted, and -errno when an internal error occurred.
+ */
+int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res)
+{
+    BDRVQcowState *s = bs->opaque;
+    int64_t size;
+    int nb_clusters, refcount1, refcount2, i;
+    uint16_t *refcount_table;
+    int ret;
+
+    size = bdrv_getlength(bs->file);
+    nb_clusters = size_to_clusters(s, size);
+    ret = inc_refcount_table(bs, res, &refcount_table);
+    if (ret) {
+        goto fail;
+    }
 
     /* compare ref counts */
     for(i = 0; i < nb_clusters; i++) {
@@ -1182,4 +1202,3 @@ fail:
 
     return ret;
 }
-
-- 
1.7.6.rc1