This helper will be reused in the next patch for duplications check.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
 block/parallels.c | 83 ++++++++++++++++++++++++++++++-----------------
 1 file changed, 53 insertions(+), 30 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index ce04a4da71..eba064247a 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -469,19 +469,48 @@ static int parallels_check_outside_image(BlockDriverState *bs,
     return 0;
 }
 
+static int64_t parallels_handle_leak(BlockDriverState *bs,
+                                     BdrvCheckResult *res,
+                                     int64_t high_off,
+                                     bool fix)
+{
+    BDRVParallelsState *s = bs->opaque;
+    int64_t size;
+    int ret;
+
+    size = bdrv_getlength(bs->file->bs);
+    if (size < 0) {
+        return size;
+    }
+
+    res->image_end_offset = high_off + s->cluster_size;
+    if (size <= res->image_end_offset) {
+        return 0;
+    }
+
+    if (fix) {
+        Error *local_err = NULL;
+        /*
+         * In order to really repair the image, we must shrink it.
+         * That means we have to pass exact=true.
+         */
+        ret = bdrv_truncate(bs->file, res->image_end_offset, true,
+                            PREALLOC_MODE_OFF, 0, &local_err);
+        if (ret < 0) {
+            error_report_err(local_err);
+            return ret;
+        }
+    }
+    return size - res->image_end_offset;
+}
+
 static int parallels_check_leak(BlockDriverState *bs,
                                 BdrvCheckResult *res,
                                 BdrvCheckMode fix)
 {
     BDRVParallelsState *s = bs->opaque;
-    int64_t size, off, high_off, count;
-    int i, ret;
-
-    size = bdrv_getlength(bs->file->bs);
-    if (size < 0) {
-        res->check_errors++;
-        return size;
-    }
+    int64_t off, high_off, count, cut_out;
+    int i;
 
     high_off = 0;
     for (i = 0; i < s->bat_size; i++) {
@@ -491,30 +520,24 @@ static int parallels_check_leak(BlockDriverState *bs,
         }
     }
 
-    res->image_end_offset = high_off + s->cluster_size;
-    if (size > res->image_end_offset) {
-        count = DIV_ROUND_UP(size - res->image_end_offset, s->cluster_size);
-        fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
-                fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR",
-                size - res->image_end_offset);
-        res->leaks += count;
-        if (fix & BDRV_FIX_LEAKS) {
-            Error *local_err = NULL;
+    cut_out = parallels_handle_leak(bs, res, high_off, fix & BDRV_FIX_LEAKS);
+    if (cut_out < 0) {
+        res->check_errors++;
+        return cut_out;
+    }
+    if (cut_out == 0) {
+        return 0;
+    }
 
-            /*
-             * In order to really repair the image, we must shrink it.
-             * That means we have to pass exact=true.
-             */
-            ret = bdrv_truncate(bs->file, res->image_end_offset, true,
-                                PREALLOC_MODE_OFF, 0, &local_err);
-            if (ret < 0) {
-                error_report_err(local_err);
-                res->check_errors++;
-                return ret;
-            }
-            res->leaks_fixed += count;
-        }
+    count = DIV_ROUND_UP(cut_out, s->cluster_size);
+    fprintf(stderr, "%s space leaked at the end of the image %" PRId64 "\n",
+            fix & BDRV_FIX_LEAKS ? "Repairing" : "ERROR", cut_out);
+
+    res->leaks += count;
+    if (fix & BDRV_FIX_LEAKS) {
+        res->leaks_fixed += count;
     }
+
     return 0;
 }
 
-- 
2.34.1