Function dirent_exists

freebsd/kern/vfs_default.c:350–391

* Check if a named file exists in a given directory vnode. */

 * Check if a named file exists in a given directory vnode.
 */
static int
dirent_exists(struct vnode *vp, const char *dirname, struct thread *td)
{
	char *dirbuf, *cpos;
	int error, eofflag, dirbuflen, len, found;
	off_t off;
	struct dirent *dp;
	struct vattr va;

	KASSERT(VOP_ISLOCKED(vp), ("vp %p is not locked", vp));
	KASSERT(vp->v_type == VDIR, ("vp %p is not a directory", vp));

	found = 0;

	error = VOP_GETATTR(vp, &va, td->td_ucred);
	if (error)
		return (found);

	dirbuflen = DEV_BSIZE;
	if (dirbuflen < va.va_blocksize)
		dirbuflen = va.va_blocksize;
	dirbuf = (char *)malloc(dirbuflen, M_TEMP, M_WAITOK);

	off = 0;
	len = 0;
	do {
		error = get_next_dirent(vp, &dp, dirbuf, dirbuflen, &off,
					&cpos, &len, &eofflag, td);
		if (error)
			goto out;

		if (dp->d_type != DT_WHT && dp->d_fileno != 0 &&
		    strcmp(dp->d_name, dirname) == 0) {
			found = 1;
			goto out;
		}
	} while (len > 0 || !eofflag);

out:
	free(dirbuf, M_TEMP);
	return (found);
}

int
vop_stdaccess(struct vop_access_args *ap)