Add a PFS_DISABLED flag; pfs_visible() automatically returns 0 if it is set

on the node in question.  Also add two API functions for setting and clearing
this flag; setting it also reclaims all vnodes associated with the node.

1 files changed, 38 insertions, 0 deletions

diff --git a/sys/fs/pseudofs/pseudofs_vncache.c b/sys/fs/pseudofs/pseudofs_vncache.c
index 191f85c..d040b08 100644
--- a/sys/fs/pseudofs/pseudofs_vncache.c
+++ b/sys/fs/pseudofs/pseudofs_vncache.c
@@ -92,6 +92,9 @@ void
 pfs_vncache_unload(void)
 {
 	rm_at_exit(pfs_exit);
+	if (pfs_vncache_entries != 0)
+		printf("pfs_vncache_unload(): %d entries remaining\n",
+		    pfs_vncache_entries);
 	mtx_destroy(&pfs_vncache_mutex);
 }
 
@@ -217,3 +220,38 @@ pfs_exit(struct proc *p)
 	}
 	mtx_unlock(&pfs_vncache_mutex);
 }
+
+/*
+ * Disable a pseudofs node, and free all vnodes associated with it
+ */
+int
+pfs_disable(struct pfs_node *pn)
+{
+	struct pfs_vdata *pvd, *prev;
+	
+	if (pn->pn_flags & PFS_DISABLED)
+		return (0);
+	mtx_lock(&pfs_vncache_mutex);
+	pn->pn_flags |= PFS_DISABLED;
+	/* see the comment about the double loop in pfs_exit() */
+	/* XXX linear search... not very efficient */
+	for (pvd = pfs_vncache; pvd != NULL; pvd = pvd->pvd_next) {
+		while (pvd != NULL && pvd->pvd_pn == pn) {
+			prev = pvd->pvd_prev;
+			vgone(pvd->pvd_vnode);
+			pvd = prev ? prev->pvd_next : pfs_vncache;
+		}
+	}
+	mtx_unlock(&pfs_vncache_mutex);
+	return (0);
+}
+
+/*
+ * Re-enable a disabled pseudofs node
+ */
+int
+pfs_enable(struct pfs_node *pn)
+{
+	pn->pn_flags &= ~PFS_DISABLED;
+	return (0);
+}