C++ (Cpp) tmpfs_dir_getdotdotdent Examples

Example #1

File: tmpfs_vnops.c Project: wan721/DragonFlyBSD

static int
tmpfs_readdir(struct vop_readdir_args *v)
{
	struct vnode *vp = v->a_vp;
	struct uio *uio = v->a_uio;
	int *eofflag = v->a_eofflag;
	off_t **cookies = v->a_cookies;
	int *ncookies = v->a_ncookies;
	struct tmpfs_mount *tmp;
	int error;
	off_t startoff;
	off_t cnt = 0;
	struct tmpfs_node *node;

	/* This operation only makes sense on directory nodes. */
	if (vp->v_type != VDIR) {
		return ENOTDIR;
	}

	tmp = VFS_TO_TMPFS(vp->v_mount);
	node = VP_TO_TMPFS_DIR(vp);
	startoff = uio->uio_offset;

	if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
		error = tmpfs_dir_getdotdent(node, uio);
		if (error != 0) {
			TMPFS_NODE_LOCK_SH(node);
			goto outok;
		}
		cnt++;
	}

	if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
		/* may lock parent, cannot hold node lock */
		error = tmpfs_dir_getdotdotdent(tmp, node, uio);
		if (error != 0) {
			TMPFS_NODE_LOCK_SH(node);
			goto outok;
		}
		cnt++;
	}

	TMPFS_NODE_LOCK_SH(node);
	error = tmpfs_dir_getdents(node, uio, &cnt);

outok:
	KKASSERT(error >= -1);

	if (error == -1)
		error = 0;

	if (eofflag != NULL)
		*eofflag =
		    (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);

	/* Update NFS-related variables. */
	if (error == 0 && cookies != NULL && ncookies != NULL) {
		off_t i;
		off_t off = startoff;
		struct tmpfs_dirent *de = NULL;

		*ncookies = cnt;
		*cookies = kmalloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);

		for (i = 0; i < cnt; i++) {
			KKASSERT(off != TMPFS_DIRCOOKIE_EOF);
			if (off == TMPFS_DIRCOOKIE_DOT) {
				off = TMPFS_DIRCOOKIE_DOTDOT;
			} else {
				if (off == TMPFS_DIRCOOKIE_DOTDOT) {
					de = RB_MIN(tmpfs_dirtree_cookie,
						&node->tn_dir.tn_cookietree);
				} else if (de != NULL) {
					de = RB_NEXT(tmpfs_dirtree_cookie,
					       &node->tn_dir.tn_cookietree, de);
				} else {
					de = tmpfs_dir_lookupbycookie(node,
								      off);
					KKASSERT(de != NULL);
					de = RB_NEXT(tmpfs_dirtree_cookie,
					       &node->tn_dir.tn_cookietree, de);
				}
				if (de == NULL)
					off = TMPFS_DIRCOOKIE_EOF;
				else
					off = tmpfs_dircookie(de);
			}
			(*cookies)[i] = off;
		}
		KKASSERT(uio->uio_offset == off);
	}
	TMPFS_NODE_UNLOCK(node);

	if ((node->tn_status & TMPFS_NODE_ACCESSED) == 0) {
		TMPFS_NODE_LOCK(node);
		node->tn_status |= TMPFS_NODE_ACCESSED;
		TMPFS_NODE_UNLOCK(node);
	}
	return error;
}

Example #2

static int
tmpfs_readdir(struct vop_readdir_args *v)
{
	struct vnode *vp = v->a_vp;
	struct uio *uio = v->a_uio;
	int *eofflag = v->a_eofflag;
	u_long **cookies = v->a_cookies;
	int *ncookies = v->a_ncookies;

	int error;
	off_t startoff;
	off_t cnt = 0;
	struct tmpfs_node *node;

	/* This operation only makes sense on directory nodes. */
	if (vp->v_type != VDIR)
		return ENOTDIR;

	node = VP_TO_TMPFS_DIR(vp);

	startoff = uio->uio_offset;

	if (uio->uio_offset == TMPFS_DIRCOOKIE_DOT) {
		error = tmpfs_dir_getdotdent(node, uio);
		if (error != 0)
			goto outok;
		cnt++;
	}

	if (uio->uio_offset == TMPFS_DIRCOOKIE_DOTDOT) {
		error = tmpfs_dir_getdotdotdent(node, uio);
		if (error != 0)
			goto outok;
		cnt++;
	}

	error = tmpfs_dir_getdents(node, uio, &cnt);

outok:
	MPASS(error >= -1);

	if (error == -1)
		error = (cnt != 0) ? 0 : EINVAL;

	if (eofflag != NULL)
		*eofflag =
		    (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);

	/* Update NFS-related variables. */
	if (error == 0 && cookies != NULL && ncookies != NULL) {
		off_t i;
		off_t off = startoff;
		struct tmpfs_dirent *de = NULL;

		*ncookies = cnt;
		*cookies = malloc(cnt * sizeof(off_t), M_TEMP, M_WAITOK);

		for (i = 0; i < cnt; i++) {
			MPASS(off != TMPFS_DIRCOOKIE_EOF);
			if (off == TMPFS_DIRCOOKIE_DOT) {
				off = TMPFS_DIRCOOKIE_DOTDOT;
			} else {
				if (off == TMPFS_DIRCOOKIE_DOTDOT) {
					de = TAILQ_FIRST(&node->tn_dir.tn_dirhead);
				} else if (de != NULL) {
					de = TAILQ_NEXT(de, td_entries);
				} else {
					de = tmpfs_dir_lookupbycookie(node,
					    off);
					MPASS(de != NULL);
					de = TAILQ_NEXT(de, td_entries);
				}
				if (de == NULL)
					off = TMPFS_DIRCOOKIE_EOF;
				else
					off = tmpfs_dircookie(de);
			}

			(*cookies)[i] = off;
		}
		MPASS(uio->uio_offset == off);
	}

	return error;
}