Пример #1
0
/*
 * Get an nfsv4 vnode of the given fid from the visible list of an
 * nfs filesystem or get the exi_vp if it is the root node.
 */
int
nfs4_vget_pseudo(struct exportinfo *exi, vnode_t **vpp, fid_t *fidp)
{
	fid_t exp_fid;
	struct exp_visible *visp;
	int error;

	/* check if the given fid is in the visible list */

	for (visp = exi->exi_visible; visp; visp = visp->vis_next) {
		if (EQFID(fidp, &visp->vis_fid)) {
			VN_HOLD(visp->vis_vp);
			*vpp = visp->vis_vp;
			return (0);
		}
	}

	/* check if the given fid is the same as the exported node */

	bzero(&exp_fid, sizeof (exp_fid));
	exp_fid.fid_len = MAXFIDSZ;
	error = vop_fid_pseudo(exi->exi_vp, &exp_fid);
	if (error)
		return (error);

	if (EQFID(fidp, &exp_fid)) {
		VN_HOLD(exi->exi_vp);
		*vpp = exi->exi_vp;
		return (0);
	}

	return (ENOENT);
}
Пример #2
0
/*
 * Get the change attribute from visible and returns TRUE.
 * If the change value is not available returns FALSE.
 */
bool_t
nfs_visible_change(struct exportinfo *exi, vnode_t *vp, timespec_t *change)
{
	struct exp_visible *visp;
	fid_t fid;
	treenode_t *node;

	/*
	 * First check to see if vp is export root.
	 */
	if (VN_CMP(vp, exi->exi_vp))
		goto exproot;

	/*
	 * Only a PSEUDO node has a visible list or an exported VROOT
	 * node may have a visible list.
	 */
	if (!PSEUDO(exi))
		exi = get_root_export(exi);

	/* Get the fid of the vnode */
	bzero(&fid, sizeof (fid));
	fid.fid_len = MAXFIDSZ;
	if (vop_fid_pseudo(vp, &fid) != 0)
		return (FALSE);

	/*
	 * We can't trust VN_CMP() above because of LOFS.
	 * Even though VOP_CMP will do the right thing for LOFS
	 * objects, VN_CMP will short circuit out early when the
	 * vnode ops ptrs are different.  Just in case we're dealing
	 * with LOFS, compare exi_fid/fsid here.
	 */
	if (EQFID(&exi->exi_fid, &fid) &&
	    EQFSID(&exi->exi_fsid, &vp->v_vfsp->vfs_fsid))
		goto exproot;

	/* See if it matches any fid in the visible list */
	for (visp = exi->exi_visible; visp; visp = visp->vis_next) {
		if (EQFID(&fid, &visp->vis_fid)) {
			*change = visp->vis_change;
			return (TRUE);
		}
	}

	return (FALSE);

exproot:
	/* The VROOT export have its visible available through treenode */
	node = exi->exi_tree;
	if (node != ns_root) {
		ASSERT(node->tree_vis != NULL);
		*change = node->tree_vis->vis_change;
	} else {
		ASSERT(node->tree_vis == NULL);
		*change = ns_root_change;
	}

	return (TRUE);
}
Пример #3
0
/*
 * Returns true if the supplied vnode is the
 * directory of an export point.
 */
int
nfs_exported(struct exportinfo *exi, vnode_t *vp)
{
	struct exp_visible *visp;
	fid_t fid;

	/*
	 * First check to see if vp is the export root
	 * This check required for the case of lookup ..
	 * where .. is a V_ROOT vnode and a pseudo exportroot.
	 * Pseudo export root objects do not have an entry
	 * in the visible list even though every V_ROOT
	 * pseudonode is visible.  It is safe to compare
	 * vp here because pseudo_exportfs put a hold on
	 * it when exi_vp was initialized.
	 *
	 * Note: VN_CMP() won't match for LOFS shares, but they're
	 * handled below w/EQFID/EQFSID.
	 */
	if (VN_CMP(vp, exi->exi_vp))
		return (1);

	/* Get the fid of the vnode */

	bzero(&fid, sizeof (fid));
	fid.fid_len = MAXFIDSZ;
	if (vop_fid_pseudo(vp, &fid) != 0)
		return (0);

	if (EQFID(&fid, &exi->exi_fid) &&
	    EQFSID(&vp->v_vfsp->vfs_fsid, &exi->exi_fsid)) {
		return (1);
	}

	/* See if it matches any fid in the visible list */

	for (visp = exi->exi_visible; visp; visp = visp->vis_next) {
		if (EQFID(&fid, &visp->vis_fid))
			return (visp->vis_exported);
	}

	return (0);
}
Пример #4
0
/*
 * Return true if the supplied vnode has a sub-directory exported.
 */
int
has_visible(struct exportinfo *exi, vnode_t *vp)
{
	struct exp_visible *visp;
	fid_t fid;
	bool_t vp_is_exported;

	vp_is_exported = VN_CMP(vp,  exi->exi_vp);

	/*
	 * An exported root vnode has a sub-dir shared if it has a visible list.
	 * i.e. if it does not have a visible list, then there is no node in
	 * this filesystem leads to any other shared node.
	 */
	if (vp_is_exported && (vp->v_flag & VROOT))
		return (exi->exi_visible ? 1 : 0);

	/*
	 * Only the exportinfo of a fs root node may have a visible list.
	 * Either it is a pseudo root node, or a real exported root node.
	 */
	exi = get_root_export(exi);

	if (!exi->exi_visible)
		return (0);

	/* Get the fid of the vnode */
	bzero(&fid, sizeof (fid));
	fid.fid_len = MAXFIDSZ;
	if (vop_fid_pseudo(vp, &fid) != 0) {
		return (0);
	}

	/*
	 * See if vp is in the visible list of the root node exportinfo.
	 */
	for (visp = exi->exi_visible; visp; visp = visp->vis_next) {
		if (EQFID(&fid, &visp->vis_fid)) {
			/*
			 * If vp is an exported non-root node with only 1 path
			 * count (for itself), it indicates no sub-dir shared
			 * using this vp as a path.
			 */
			if (vp_is_exported && visp->vis_count < 2)
				break;

			return (1);
		}
	}

	return (0);
}
Пример #5
0
/*
 * Returns true if the supplied vnode is visible
 * in this export.  If vnode is visible, return
 * vis_exported in expseudo.
 */
int
nfs_visible(struct exportinfo *exi, vnode_t *vp, int *expseudo)
{
	struct exp_visible *visp;
	fid_t fid;

	/*
	 * First check to see if vp is export root.
	 *
	 * A pseudo export root can never be exported
	 * (it would be a real export then); however,
	 * it is always visible.  If a pseudo root object
	 * was exported by server admin, then the entire
	 * pseudo exportinfo (and all visible entries) would
	 * be destroyed.  A pseudo exportinfo only exists
	 * to provide access to real (descendant) export(s).
	 *
	 * Previously, rootdir was special cased here; however,
	 * the export root special case handles the rootdir
	 * case also.
	 */
	if (VN_CMP(vp, exi->exi_vp)) {
		*expseudo = 0;
		return (1);
	}

	/*
	 * Only a PSEUDO node has a visible list or an exported VROOT
	 * node may have a visible list.
	 */
	if (! PSEUDO(exi))
		exi = get_root_export(exi);

	/* Get the fid of the vnode */

	bzero(&fid, sizeof (fid));
	fid.fid_len = MAXFIDSZ;
	if (vop_fid_pseudo(vp, &fid) != 0) {
		*expseudo = 0;
		return (0);
	}

	/*
	 * We can't trust VN_CMP() above because of LOFS.
	 * Even though VOP_CMP will do the right thing for LOFS
	 * objects, VN_CMP will short circuit out early when the
	 * vnode ops ptrs are different.  Just in case we're dealing
	 * with LOFS, compare exi_fid/fsid here.
	 *
	 * expseudo is not set because this is not an export
	 */
	if (EQFID(&exi->exi_fid, &fid) &&
	    EQFSID(&exi->exi_fsid, &vp->v_vfsp->vfs_fsid)) {
		*expseudo = 0;
		return (1);
	}


	/* See if it matches any fid in the visible list */

	for (visp = exi->exi_visible; visp; visp = visp->vis_next) {
		if (EQFID(&fid, &visp->vis_fid)) {
			*expseudo = visp->vis_exported;
			return (1);
		}
	}

	*expseudo = 0;

	return (0);
}
Пример #6
0
/*
 * When we export a new directory we need to add a new
 * path segment through the pseudofs to reach the new
 * directory. This new path is reflected in a list of
 * directories added to the "visible" list.
 *
 * Here there are two lists of visible fids: one hanging off the
 * pseudo exportinfo, and the one we want to add.  It's possible
 * that the two lists share a common path segment
 * and have some common directories.  We need to combine
 * the lists so there's no duplicate entries. Where a common
 * path component is found, the vis_count field is bumped.
 *
 * This example shows that the treenode chain (tree_head) and
 * exp_visible chain (vis_head) can differ in length. The latter
 * can be shorter. The outer loop must loop over the vis_head chain.
 *
 * share /x/a
 * mount -F ufs /dev/dsk/... /x/y
 * mkdir -p /x/y/a/b
 * share  /x/y/a/b
 *
 * When more_visible() is called during the second share,
 * the existing namespace is following:
 *                                   exp_visible_t
 *   treenode_t       exportinfo_t      v0     v1
 * ns_root+---+        +------------+  +---+  +---+
 *      t0| / |........| E0 pseudo  |->| x |->| a |
 *        +---+        +------------+  +---+  +---+
 *          |                           /    /
 *        +---+                        /    /
 *      t1| x |------------------------    /
 *        +---+                           /
 *          |                            /
 *        +---+                         /
 *      t2| a |-------------------------
 *        +---+........+------------+
 *                     | E1 real    |
 *                     +------------+
 *
 * This is being added:
 *
 *    tree_head  vis_head
 *        +---+  +---+
 *      t3| x |->| x |v2
 *        +---+  +---+
 *          |      |
 *        +---+  +---+                     v4     v5
 *      t4| y |->| y |v3  +------------+  +---+  +---+
 *        +---+\ +---+    | E2 pseudo  |->| a |->| b |
 *          |   \....... >+------------+  +---+  +---+
 *        +---+                           /      /
 *      t5| a |---------------------------      /
 *        +---+                                /
 *          |                                 /
 *        +---+-------------------------------
 *      t6| b |           +------------+
 *        +---+..........>| E3 real    |
 *                        +------------+
 *
 * more_visible() will:
 * - kmem_free() t3 and v2
 * - add t4, t5, t6 as a child of t1 (t4 will become sibling of t2)
 * - add v3 to the end of E0->exi_visible
 *
 * Note that v4 and v5 were already processed in pseudo_exportfs() and
 * added to E2. The outer loop of more_visible() will loop only over v2
 * and v3. The inner loop of more_visible() always loops over v0 and v1.
 *
 * Illustration for this scenario:
 *
 * mkdir -p /v/a/b/c
 * share /v/a/b/c
 * mkdir /v/a/b/c1
 * mkdir -p /v/a1
 * mv /v/a/b /v/a1
 * share /v/a1/b/c1
 *
 *           EXISTING
 *           treenode
 *           namespace:    +-----------+   visibles
 *                         |exportinfo |-->v->a->b->c
 * connect_point->+---+--->+-----------+
 *                | / |T0
 *                +---+
 *                  |                            NEW treenode chain:
 *         child->+---+
 *                | v |T1                          +---+<-curr
 *                +---+                          N1| v |
 *                  |                              +---+
 *                +---+                              |
 *                | a |T2                          +---+<-tree_head
 *                +---+                          N2| a1|
 *                  |                              +---+
 *                +---+                              |
 *                | b |T3                          +---+
 *                +---+                          N3| b |
 *                  |                              +---+
 *                +---+                              |
 *                | c |T4                          +---+
 *                +---+                          N4| c1|
 *                                                 +---+
 *
 * The picture above illustrates the position of following pointers after line
 * 'child = tree_find_child_by_vis(connect_point, curr->tree_vis);'
 * was executed for the first time in the outer 'for' loop:
 *
 * connect_point..parent treenode in the EXISTING namespace to which the 'curr'
 *                should be connected. If 'connect_point' already has a child
 *                with the same value of tree_vis as the curr->tree_vis is,
 *                the 'curr' will not be added, but kmem_free()d.
 * child..........the result of tree_find_child_by_vis()
 * curr...........currently processed treenode from the NEW treenode chain
 * tree_head......current head of the NEW treenode chain, in this case it was
 *                already moved down to its child - preparation for another loop
 *
 * What will happen to NEW treenodes N1, N2, N3, N4 in more_visible() later:
 *
 * N1: is merged - i.e. N1 is kmem_free()d. T0 has a child T1 with the same
 *     tree_vis as N1
 * N2: is added as a new child of T1
 *     Note: not just N2, but the whole chain N2->N3->N4 is added
 * N3: not processed separately (it was added together with N2)
 *     Even that N3 and T3 have same tree_vis, they are NOT merged, but will
 *     become duplicates.
 * N4: not processed separately
 */
static void
more_visible(struct exportinfo *exi, treenode_t *tree_head)
{
	struct exp_visible *vp1, *vp2, *vis_head, *tail, *next;
	int found;
	treenode_t *child, *curr, *connect_point;

	vis_head = tree_head->tree_vis;
	connect_point = exi->exi_tree;

	/*
	 * If exportinfo doesn't already have a visible
	 * list just assign the entire supplied list.
	 */
	if (exi->exi_visible == NULL) {
		tree_add_child(exi->exi_tree, tree_head);
		exi->exi_visible = vis_head;
		return;
	}

	/* The outer loop traverses the supplied list. */
	for (vp1 = vis_head; vp1; vp1 = next) {
		found = 0;
		next = vp1->vis_next;

		/* The inner loop searches the exportinfo visible list. */
		for (vp2 = exi->exi_visible; vp2; vp2 = vp2->vis_next) {
			tail = vp2;
			if (EQFID(&vp1->vis_fid, &vp2->vis_fid)) {
				found = 1;
				vp2->vis_count++;
				VN_RELE(vp1->vis_vp);
				/* Transfer vis_exported from vp1 to vp2. */
				if (vp1->vis_exported && !vp2->vis_exported)
					vp2->vis_exported = 1;
				kmem_free(vp1, sizeof (*vp1));
				tree_head->tree_vis = vp2;
				break;
			}
		}

		/* If not found - add to the end of the list */
		if (! found) {
			tail->vis_next = vp1;
			vp1->vis_next = NULL;
		}

		curr = tree_head;
		tree_head = tree_head->tree_child_first;

		if (! connect_point) /* No longer merging */
			continue;
		/*
		 * The inner loop could set curr->tree_vis to the EXISTING
		 * exp_visible vp2, so we can search among the children of
		 * connect_point for the curr->tree_vis. No need for EQFID.
		 */
		child = tree_find_child_by_vis(connect_point, curr->tree_vis);

		/*
		 * Merging cannot be done if a valid child->tree_exi would
		 * be overwritten by a new curr->tree_exi.
		 */
		if (child &&
		    (child->tree_exi == NULL || curr->tree_exi == NULL)) {
			if (curr->tree_exi) { /* Transfer the exportinfo */
				child->tree_exi = curr->tree_exi;
				child->tree_exi->exi_tree = child;
			}
			kmem_free(curr, sizeof (treenode_t));
			connect_point = child;
		} else { /* Branching */
			tree_add_child(connect_point, curr);
			connect_point = NULL;
		}
	}
}