Many files:

Many files:
  alloc.c (ext2fs_alloc_block): New function which allocates a
  	block and updates the filesystem accounting records
  	appropriately.
  ext2_err.et.in: Added new error codes: EXT2_NO_MEMORY,
  	EXT2_INVALID_ARGUMENT, EXT2_BLOCK_ALLOC_FAIL, EXT2_INODE_ALLOC_FAIL,
  	EXT2_NOT_DIRECTORY
  Change various library files to use these functions instead of EINVAL,
  ENOENT, etc.
ChangeLog, pass1.c, pass3.c:
  pass3.c (get_lost_and_found): Check error return of
  	EXT2_FILE_NOT_FOUND instead of ENOTDIR
  pass1.c (pass1_check_directory): Return EXT2_NO_DIRECTORY instead of
  	ENOTDIR
expect.icount:
  Change expected error string to be "Invalid argument passed to ext2 library"
  instead of just "Invalid argument"