xfs_attr_shortform_addname(xfs_da_args_t *args)
{
	int newsize, forkoff, retval;

	trace_xfs_attr_sf_addname(args);

	retval = xfs_attr_shortform_lookup(args);
	if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
		return retval;
	} else if (retval == -EEXIST) {
		if (args->flags & ATTR_CREATE)
			return retval;
		retval = xfs_attr_shortform_remove(args);
		if (retval)
			return retval;
		/*
		 * Since we have removed the old attr, clear ATTR_REPLACE so
		 * that the leaf format add routine won't trip over the attr
		 * not being around.
		 */
		args->flags &= ~ATTR_REPLACE;
	}

	if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
	    args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
		return -ENOSPC;

	newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
	newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);

	forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
	if (!forkoff)
		return -ENOSPC;

	xfs_attr_shortform_add(args, forkoff);
	return 0;
}
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.