Made sure that IsoStream from old image are equivalent only if their

data extents have same LBAs and sizes.

libisofs/fs_image.c

@@ -3510,3 +3510,30 @@ int iso_file_get_old_image_sections(IsoFile *file, int *section_count,
     }
     return 0;
 }
+
+/* ts A90524 */
+/* Rank two IsoFileSource by their eventual old image LBAs.
+   Other IsoFileSource classes will be ranked only roughly.
+*/
+int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int flag)
+{
+    int i;
+    ImageFileSourceData *d1, *d2;
+
+    if (s1->class != s2->class)
+        return (s1->class < s2->class ? -1 : 1);
+    if (s1->class != &ifs_class)
+        return(0);
+
+    d1= s1->data;
+    d2= s2->data;
+    for (i = 0; i < d1->nsections; i++) {
+        if (i >= d2->nsections)
+            return 1;
+        if (d1->sections[i].block != d2->sections[i].block)
+            return (d1->sections[i].block < d2->sections[i].block ? -1 : 1);
+        if (d1->sections[i].size != d2->sections[i].size)
+            return (d1->sections[i].size < d2->sections[i].size ? -1 : 1);
+    }
+    return(0);
+}

libisofs/fsource.h

@@ -30,4 +30,11 @@
  */
 int iso_local_filesystem_new(IsoFilesystem **fs);
 
+
+/* ts A90524 */
+/* Rank two IsoFileSource by their eventual old image LBAs.
+   Other IsoFileSource classes will be ranked only roughly.
+*/
+int iso_ifs_sections_cmp(IsoFileSource *s1, IsoFileSource *s2, int flag);
+
 #endif /*LIBISO_FSOURCE_H_*/

libisofs/libisofs.h

@@ -2640,7 +2640,7 @@ int iso_node_remove(IsoNode *node);
  * If node is the root node, the same node will be returned as its parent.
  *
  * This returns NULL if the node doesn't pertain to any tree
- * (it was removed/take).
+ * (it was removed/taken).
  *
  * @since 0.6.2
  */

libisofs/stream.c

@@ -737,6 +737,7 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
     dev_t dev_id1, dev_id2;
     ino_t ino_id1, ino_id2;
     off_t size1, size2;
+    FSrcStreamData *fssd1, *fssd2;
 
     /* <<< */
     static int report_counter = 0;
@@ -802,6 +803,17 @@ int iso_stream_cmp_ino(IsoStream *s1, IsoStream *s2, int flag)
         return 1;
     }
 
+    if (s1->class != s2->class)
+        return (s1->class < s2->class ? -1 : 1);
+    if (s1->class == &fsrc_stream_class) {
+        /* Compare eventual image data section LBA and sizes */
+        fssd1= (FSrcStreamData *) s1->data;
+        fssd2= (FSrcStreamData *) s2->data;
+        ret = iso_ifs_sections_cmp(fssd1->src, fssd2->src, 0);
+        if (ret != 0)
+            return ret;
+    }
+
 #ifdef Libisofs_hardlink_matcheR
     if (fs_id1 == 0 && dev_id1 == 0 && ino_id1 == 0) {
         return (s1 < s2 ? -1 : 1);