parallels: refactor path when we need to re-check image in parallels_…

…open

More conditions follows thus the check should be more scalable.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>

block/parallels.c

@@ -1071,7 +1071,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
     int ret, size, i;
     int64_t file_nb_sectors, sector;
     uint32_t data_start;
-    bool data_off_is_correct;
+    bool need_check = false;
 
     ret = parallels_opts_prealloc(bs, options, errp);
     if (ret < 0) {
@@ -1139,11 +1139,14 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
     s->bat_bitmap = (uint32_t *)(s->header + 1);
 
     if (le32_to_cpu(ph.inuse) == HEADER_INUSE_MAGIC) {
-        s->header_unclean = true;
+        need_check = s->header_unclean = true;
+    }
+
+    {
+        bool ok = parallels_test_data_off(s, file_nb_sectors, &data_start);
+        need_check = need_check || !ok;
     }
 
-    data_off_is_correct = parallels_test_data_off(s, file_nb_sectors,
-                                                  &data_start);
     s->data_start = data_start;
     s->data_end = s->data_start;
     if (s->data_end < (s->header_size >> BDRV_SECTOR_BITS)) {
@@ -1200,6 +1203,7 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
             s->data_end = sector + s->tracks;
         }
     }
+    need_check = need_check || s->data_end > file_nb_sectors;
 
     /*
      * We don't repair the image here if it's opened for checks. Also we don't
@@ -1209,12 +1213,8 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
         return 0;
     }
 
-    /*
-     * Repair the image if it's dirty or
-     * out-of-image corruption was detected.
-     */
-    if (s->data_end > file_nb_sectors || s->header_unclean
-        || !data_off_is_correct) {
+    /* Repair the image if corruption was detected. */
+    if (need_check) {
         BdrvCheckResult res;
         ret = bdrv_check(bs, &res, BDRV_FIX_ERRORS | BDRV_FIX_LEAKS);
         if (ret < 0) {
@@ -1223,7 +1223,6 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
             goto fail;
         }
     }
-
     return 0;
 
 fail_format: