qcow2-refcount: improve style of check_refcounts_l2()

 - don't use same name for size in bytes and in entries
 - use g_autofree for l2_table
 - add whitespace
 - fix block comment style

Signed-off-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Reviewed-by: Hanna Reitz <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Hanna Reitz <[email protected]>

Author: Vladimir Sementsov-Ogievskiy

block/qcow2-refcount.c

@@ -1601,23 +1601,22 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                               int flags, BdrvCheckMode fix, bool active)
 {
     BDRVQcow2State *s = bs->opaque;
-    uint64_t *l2_table, l2_entry;
+    uint64_t l2_entry;
     uint64_t next_contiguous_offset = 0;
-    int i, l2_size, nb_csectors, ret;
+    int i, nb_csectors, ret;
+    size_t l2_size_bytes = s->l2_size * l2_entry_size(s);
+    g_autofree uint64_t *l2_table = g_malloc(l2_size_bytes);
 
     /* Read L2 table from disk */
-    l2_size = s->l2_size * l2_entry_size(s);
-    l2_table = g_malloc(l2_size);
-
-    ret = bdrv_pread(bs->file, l2_offset, l2_table, l2_size);
+    ret = bdrv_pread(bs->file, l2_offset, l2_table, l2_size_bytes);
     if (ret < 0) {
         fprintf(stderr, "ERROR: I/O error in check_refcounts_l2\n");
         res->check_errors++;
-        goto fail;
+        return ret;
     }
 
     /* Do the actual checks */
-    for(i = 0; i < s->l2_size; i++) {
+    for (i = 0; i < s->l2_size; i++) {
         l2_entry = get_l2_entry(s, l2_table, i);
 
         switch (qcow2_get_cluster_type(bs, l2_entry)) {
@@ -1647,14 +1646,15 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                 l2_entry & QCOW2_COMPRESSED_SECTOR_MASK,
                 nb_csectors * QCOW2_COMPRESSED_SECTOR_SIZE);
             if (ret < 0) {
-                goto fail;
+                return ret;
             }
 
             if (flags & CHECK_FRAG_INFO) {
                 res->bfi.allocated_clusters++;
                 res->bfi.compressed_clusters++;
 
-                /* Compressed clusters are fragmented by nature.  Since they
+                /*
+                 * Compressed clusters are fragmented by nature.  Since they
                  * take up sub-sector space but we only have sector granularity
                  * I/O we need to re-read the same sectors even for adjacent
                  * compressed clusters.
@@ -1700,9 +1700,11 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                         if (ret < 0) {
                             fprintf(stderr, "ERROR: Overlap check failed\n");
                             res->check_errors++;
-                            /* Something is seriously wrong, so abort checking
-                             * this L2 table */
-                            goto fail;
+                            /*
+                             * Something is seriously wrong, so abort checking
+                             * this L2 table.
+                             */
+                            return ret;
                         }
 
                         ret = bdrv_pwrite_sync(bs->file, l2e_offset,
@@ -1712,13 +1714,17 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                             fprintf(stderr, "ERROR: Failed to overwrite L2 "
                                     "table entry: %s\n", strerror(-ret));
                             res->check_errors++;
-                            /* Do not abort, continue checking the rest of this
-                             * L2 table's entries */
+                            /*
+                             * 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) */
+                            /*
+                             * Skip marking the cluster as used
+                             * (it is unused now).
+                             */
                             continue;
                         }
                     }
@@ -1743,7 +1749,7 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
                                                refcount_table_size,
                                                offset, s->cluster_size);
                 if (ret < 0) {
-                    goto fail;
+                    return ret;
                 }
             }
             break;
@@ -1758,12 +1764,7 @@ static int check_refcounts_l2(BlockDriverState *bs, BdrvCheckResult *res,
         }
     }
 
-    g_free(l2_table);
     return 0;
-
-fail:
-    g_free(l2_table);
-    return ret;
 }
 
 /*