+int ext2fs_file_block_offset_too_big(ext2_filsys fs,
+ struct ext2_inode *inode,
+ blk64_t offset)
+{
+ blk64_t addr_per_block, max_map_block;
+
+ /* Kernel seems to cut us off at 4294967294 blocks */
+ if (offset >= (1ULL << 32) - 1)
+ return 1;
+
+ if (inode->i_flags & EXT4_EXTENTS_FL)
+ return 0;
+
+ addr_per_block = fs->blocksize >> 2;
+ max_map_block = addr_per_block;
+ max_map_block += addr_per_block * addr_per_block;
+ max_map_block += addr_per_block * addr_per_block * addr_per_block;
+ max_map_block += 12;
+
+ return offset >= max_map_block;
+}