fBackupBitmap
return fBackupBitmap[index] & (1L << (block & 0x1f));
bool oldUsed = fBackupBitmap[index] & mask;
fBackupBitmap[index] |= mask;
fBackupBitmap[index] &= ~mask;
if (fBitmap[i] != fBackupBitmap[i]) {
fBitmap[i], fBackupBitmap[i]);
fBackupBitmap(NULL),
free(fBackupBitmap);
fBackupBitmap = (uint32 *)malloc(fByteSize);
if (fBackupBitmap == NULL)
memset(fBackupBitmap, 0, fByteSize);
free(fBackupBitmap);
fBackupBitmap = NULL;
uint32 *fBackupBitmap;