Many files:

Many files:
  ext2fs.h: Add new superblock fields (s_algorithm_usage_bitmap,
  	s_prealloc_blocks, s_prealloc_dir_blocks).  Added conditional defines
  	of new features COMPAT_DIR_PREALLOC, RO_COMPAT_LARGE_FILE
  	RO_COMPAT_BTREE_DIR, INCOMPAT_COMPRESSION, INCOMPAT_DIRNAME_SIZE.
  	Changed the library to declare that we support COMPAT_DIR_PREALLOC,
  	INCOMPAT_DIRNAME_SIZE, RO_COMPAT_LARGE_FILE.
  fileio.c: Rename function ext2fs_file_llseek to be ext2fs_file_lseek,
  	which is more accurate.
  block.c: Add new function ext2fs_block_iterate3 which calls the
  	iterator function with the blockcount argument of type blkcnt_t.  This
  	version of the function is allowed to handle large files; the other
  	fucntions are not.
  ext2fs.h: Add new type blkcnt_t
  ext2_err.et.in: Add error code EXT2_ET_FILE_TOO_BIG
  block.c (ext2fs_block_iterate2): Fix bug where the block count field
  	wasn't getting correctly incremented for sparse files when the
  	indirect or doubly-indirect block specified in the inode was zero.
  unlink.c (unlink_proc):
  lookup.c (lookup_proc):
  link.c (link_proc):
  get_pathname.c (get_pathname_proc):
  dir_iterate.c (ext2fs_process_dir_block): Mask off high 8 bits from
  	dirent->name_len, so it can be used for other purposes.
  ext2fs.h: Add definition of EXT2_FEATURE_INCOMPAT_DIRNAME_SIZE, and
  	indicate that we have support for this incompatible option.