qcow2-refcount: don't mask corruptions under internal errors

No reasons for not reporting found corruptions as corruptions in case
of some internal errors, especially in case of just failed to fix l2
entry (and in this case, missed corruptions may influence comparing
logic, when we calculate difference between corruptions fields of two
results)

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20190227131433.197063-6-vsementsov@virtuozzo.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 6851807ffc1fa8fa8c2f3785ff833ed2ecae0a93..fa7ac1f7cb3f1d9c14e429d6f761d1929de5836c 100644 (file)
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1662,6 +1662,8 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
 
             /* Correct offsets are cluster aligned */
             if (offset_into_cluster(s, offset)) {
+                res->corruptions++;
+
                 if (qcow2_get_cluster_type(bs, l2_entry) ==
                     QCOW2_CLUSTER_ZERO_ALLOC)
                 {
@@ -1697,18 +1699,16 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                             /* Do not abort, continue checking the rest of this
                              * L2 table's entries */
                         } else {
+                            res->corruptions--;
                             res->corruptions_fixed++;
                             /* Skip marking the cluster as used
                              * (it is unused now) */
                             continue;
                         }
-                    } else {
-                        res->corruptions++;
                     }
                 } else {
                     fprintf(stderr, "ERROR offset=%" PRIx64 ": Data cluster is "
                         "not properly aligned; L2 entry corrupted.\n", offset);
-                    res->corruptions++;
                 }
             }
 
@@ -1879,6 +1879,7 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
             continue;
         }
         if ((refcount == 1) != ((l1_entry & QCOW_OFLAG_COPIED) != 0)) {
+            res->corruptions++;
             fprintf(stderr, "%s OFLAG_COPIED L2 cluster: l1_index=%d "
                     "l1_entry=%" PRIx64 " refcount=%" PRIu64 "\n",
                     repair ? "Repairing" : "ERROR", i, l1_entry, refcount);
@@ -1891,9 +1892,8 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
                     res->check_errors++;
                     goto fail;
                 }
+                res->corruptions--;
                 res->corruptions_fixed++;
-            } else {
-                res->corruptions++;
             }
         }
 
@@ -1925,6 +1925,7 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
                     }
                 }
                 if ((refcount == 1) != ((l2_entry & QCOW_OFLAG_COPIED) != 0)) {
+                    res->corruptions++;
                     fprintf(stderr, "%s OFLAG_COPIED data cluster: "
                             "l2_entry=%" PRIx64 " refcount=%" PRIu64 "\n",
                             repair ? "Repairing" : "ERROR", l2_entry, refcount);
@@ -1933,8 +1934,6 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
                                     ? l2_entry |  QCOW_OFLAG_COPIED
                                     : l2_entry & ~QCOW_OFLAG_COPIED);
                         l2_dirty++;
-                    } else {
-                        res->corruptions++;
                     }
                 }
             }
@@ -1959,6 +1958,7 @@ static int check_oflag_copied(BlockDriverState *bs, BdrvCheckResult *res,
                 res->check_errors++;
                 goto fail;
             }
+            res->corruptions -= l2_dirty;
             res->corruptions_fixed += l2_dirty;
         }
     }
@@ -1997,6 +1997,7 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
         }
 
         if (cluster >= *nb_clusters) {
+            res->corruptions++;
             fprintf(stderr, "%s refcount block %" PRId64 " is outside image\n",
                     fix & BDRV_FIX_ERRORS ? "Repairing" : "ERROR", i);
 
@@ -2036,6 +2037,7 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
                     goto resize_fail;
                 }
 
+                res->corruptions--;
                 res->corruptions_fixed++;
                 ret = qcow2_inc_refcounts_imrt(bs, res,
                                                refcount_table, nb_clusters,
@@ -2049,12 +2051,9 @@ static int check_refblocks(BlockDriverState *bs, BdrvCheckResult *res,
                 continue;
 
 resize_fail:
-                res->corruptions++;
                 *rebuild = true;
                 fprintf(stderr, "ERROR could not resize image: %s\n",
                         strerror(-ret));
-            } else {
-                res->corruptions++;
             }
             continue;
         }