header_size = sizeof(header);
backing_filename_len = 0;
if (backing_file) {
- header.backing_file_offset = cpu_to_be64(header_size);
- backing_filename_len = strlen(backing_file);
- header.backing_file_size = cpu_to_be32(backing_filename_len);
- header_size += backing_filename_len;
- header.mtime = cpu_to_be32(0);
+ if (strcmp(backing_file, "fat:")) {
+ header.backing_file_offset = cpu_to_be64(header_size);
+ backing_filename_len = strlen(backing_file);
+ header.backing_file_size = cpu_to_be32(backing_filename_len);
+ header_size += backing_filename_len;
+ } else {
+ /* special backing file for vvfat */
+ backing_file = NULL;
+ }
header.cluster_bits = 9; /* 512 byte cluster to avoid copying
unmodifyed sectors */
header.l2_bits = 12; /* 32 KB L2 tables */