Add four more filesystem flags:

	VFCF_NETWORK (this FS goes over the net)
	VFCF_READONLY (read-write mounts do not make any sense)
	VFCF_SYNTHETIC (data in this FS is not real)
	VFCF_LOOPBACK (this FS aliases something else)

cd9660 is readonly; nullfs, umapfs, and union are loopback; NFS is netowkr;
procfs, kernfs, and fdesc are synthetic.

18 files changed, 43 insertions, 35 deletions

diff --git a/sys/fs/cd9660/cd9660_vfsops.c b/sys/fs/cd9660/cd9660_vfsops.c
index 7fd09f2..225e35f 100644
--- a/sys/fs/cd9660/cd9660_vfsops.c
+++ b/sys/fs/cd9660/cd9660_vfsops.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)cd9660_vfsops.c	8.3 (Berkeley) 1/31/94
- * $Id: cd9660_vfsops.c,v 1.9 1994/11/14 07:01:58 bde Exp $
+ * $Id: cd9660_vfsops.c,v 1.10 1995/01/16 17:03:27 joerg Exp $
  */
 
 #include <sys/param.h>
@@ -70,7 +70,7 @@ struct vfsops cd9660_vfsops = {
 	cd9660_vptofh,
 	cd9660_init,
 };
-VFS_SET(cd9660_vfsops, cd9660, MOUNT_CD9660, 0);
+VFS_SET(cd9660_vfsops, cd9660, MOUNT_CD9660, VFCF_READONLY);
 
 
 /*
diff --git a/sys/fs/fdescfs/fdesc_vfsops.c b/sys/fs/fdescfs/fdesc_vfsops.c
index e44c045..f44158e 100644
--- a/sys/fs/fdescfs/fdesc_vfsops.c
+++ b/sys/fs/fdescfs/fdesc_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)fdesc_vfsops.c	8.4 (Berkeley) 1/21/94
  *
- * $Id: fdesc_vfsops.c,v 1.2 1994/09/21 03:46:55 wollman Exp $
+ * $Id: fdesc_vfsops.c,v 1.3 1995/03/16 18:13:05 bde Exp $
  */
 
 /*
@@ -287,4 +287,4 @@ struct vfsops fdesc_vfsops = {
 	fdesc_init,
 };
 
-VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, 0);
+VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
diff --git a/sys/fs/nullfs/null_vfsops.c b/sys/fs/nullfs/null_vfsops.c
index f7656c4..9b7e9da 100644
--- a/sys/fs/nullfs/null_vfsops.c
+++ b/sys/fs/nullfs/null_vfsops.c
@@ -36,7 +36,7 @@
  *	@(#)null_vfsops.c	8.2 (Berkeley) 1/21/94
  *
  * @(#)lofs_vfsops.c	1.2 (Berkeley) 6/18/92
- * $Id: null_vfsops.c,v 1.4 1994/10/10 07:55:28 phk Exp $
+ * $Id: null_vfsops.c,v 1.5 1995/03/16 18:13:31 bde Exp $
  */
 
 /*
@@ -368,4 +368,4 @@ struct vfsops null_vfsops = {
 	nullfs_init,
 };
 
-VFS_SET(null_vfsops, null, MOUNT_NULL, 0);
+VFS_SET(null_vfsops, null, MOUNT_NULL, VFCF_LOOPBACK);
diff --git a/sys/fs/portalfs/portal_vfsops.c b/sys/fs/portalfs/portal_vfsops.c
index cad30bd..130f991 100644
--- a/sys/fs/portalfs/portal_vfsops.c
+++ b/sys/fs/portalfs/portal_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)portal_vfsops.c	8.6 (Berkeley) 1/21/94
  *
- * $Id: portal_vfsops.c,v 1.5 1994/10/10 07:55:35 phk Exp $
+ * $Id: portal_vfsops.c,v 1.6 1995/03/16 18:13:38 bde Exp $
  */
 
 /*
@@ -315,4 +315,4 @@ struct vfsops portal_vfsops = {
 	portal_init,
 };
 
-VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, 0);
+VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC);
diff --git a/sys/fs/procfs/procfs_vfsops.c b/sys/fs/procfs/procfs_vfsops.c
index 4379d0a..b933a18 100644
--- a/sys/fs/procfs/procfs_vfsops.c
+++ b/sys/fs/procfs/procfs_vfsops.c
@@ -36,7 +36,7 @@
  *
  *	@(#)procfs_vfsops.c	8.4 (Berkeley) 1/21/94
  *
- *	$Id: procfs_vfsops.c,v 1.7 1995/02/20 15:53:33 davidg Exp $
+ *	$Id: procfs_vfsops.c,v 1.8 1995/03/16 18:13:47 bde Exp $
  */
 
 /*
@@ -253,4 +253,4 @@ struct vfsops procfs_vfsops = {
 	procfs_init,
 };
 
-VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, 0);
+VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, VFCF_SYNTHETIC);
diff --git a/sys/fs/umapfs/umap_vfsops.c b/sys/fs/umapfs/umap_vfsops.c
index 0eeab20..a98ae18 100644
--- a/sys/fs/umapfs/umap_vfsops.c
+++ b/sys/fs/umapfs/umap_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)umap_vfsops.c	8.3 (Berkeley) 1/21/94
  *
- * $Id: umap_vfsops.c,v 1.5 1994/10/10 07:55:43 phk Exp $
+ * $Id: umap_vfsops.c,v 1.6 1995/03/16 18:13:55 bde Exp $
  */
 
 /*
@@ -409,5 +409,5 @@ struct vfsops umap_vfsops = {
 	umapfs_init,
 };
 
-VFS_SET(umap_vfsops, umap, MOUNT_UMAP, 0);
+VFS_SET(umap_vfsops, umap, MOUNT_UMAP, VFCF_LOOPBACK);
 
diff --git a/sys/fs/unionfs/union_vfsops.c b/sys/fs/unionfs/union_vfsops.c
index 4000f98..c9e2c60 100644
--- a/sys/fs/unionfs/union_vfsops.c
+++ b/sys/fs/unionfs/union_vfsops.c
@@ -35,7 +35,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)union_vfsops.c	8.7 (Berkeley) 3/5/94
- * $Id: union_vfsops.c,v 1.7 1994/11/04 14:41:43 davidg Exp $
+ * $Id: union_vfsops.c,v 1.8 1995/03/16 18:14:02 bde Exp $
  */
 
 /*
@@ -559,4 +559,4 @@ struct vfsops union_vfsops = {
 	union_init,
 };
 
-VFS_SET(union_vfsops, union, MOUNT_UNION, 0);
+VFS_SET(union_vfsops, union, MOUNT_UNION, VFCF_LOOPBACK);
diff --git a/sys/isofs/cd9660/cd9660_vfsops.c b/sys/isofs/cd9660/cd9660_vfsops.c
index 7fd09f2..225e35f 100644
--- a/sys/isofs/cd9660/cd9660_vfsops.c
+++ b/sys/isofs/cd9660/cd9660_vfsops.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)cd9660_vfsops.c	8.3 (Berkeley) 1/31/94
- * $Id: cd9660_vfsops.c,v 1.9 1994/11/14 07:01:58 bde Exp $
+ * $Id: cd9660_vfsops.c,v 1.10 1995/01/16 17:03:27 joerg Exp $
  */
 
 #include <sys/param.h>
@@ -70,7 +70,7 @@ struct vfsops cd9660_vfsops = {
 	cd9660_vptofh,
 	cd9660_init,
 };
-VFS_SET(cd9660_vfsops, cd9660, MOUNT_CD9660, 0);
+VFS_SET(cd9660_vfsops, cd9660, MOUNT_CD9660, VFCF_READONLY);
 
 
 /*
diff --git a/sys/miscfs/fdesc/fdesc_vfsops.c b/sys/miscfs/fdesc/fdesc_vfsops.c
index e44c045..f44158e 100644
--- a/sys/miscfs/fdesc/fdesc_vfsops.c
+++ b/sys/miscfs/fdesc/fdesc_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)fdesc_vfsops.c	8.4 (Berkeley) 1/21/94
  *
- * $Id: fdesc_vfsops.c,v 1.2 1994/09/21 03:46:55 wollman Exp $
+ * $Id: fdesc_vfsops.c,v 1.3 1995/03/16 18:13:05 bde Exp $
  */
 
 /*
@@ -287,4 +287,4 @@ struct vfsops fdesc_vfsops = {
 	fdesc_init,
 };
 
-VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, 0);
+VFS_SET(fdesc_vfsops, fdesc, MOUNT_FDESC, VFCF_SYNTHETIC);
diff --git a/sys/miscfs/kernfs/kernfs_vfsops.c b/sys/miscfs/kernfs/kernfs_vfsops.c
index e59d295..4c54975 100644
--- a/sys/miscfs/kernfs/kernfs_vfsops.c
+++ b/sys/miscfs/kernfs/kernfs_vfsops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)kernfs_vfsops.c	8.4 (Berkeley) 1/21/94
- * $Id: kernfs_vfsops.c,v 1.6 1994/10/02 17:48:08 phk Exp $
+ * $Id: kernfs_vfsops.c,v 1.7 1995/03/16 18:13:23 bde Exp $
  */
 
 /*
@@ -343,4 +343,4 @@ struct vfsops kernfs_vfsops = {
 	kernfs_init,
 };
 
-VFS_SET(kernfs_vfsops, kernfs, MOUNT_KERNFS, 0);
+VFS_SET(kernfs_vfsops, kernfs, MOUNT_KERNFS, VFCF_SYNTHETIC);
diff --git a/sys/miscfs/nullfs/null_vfsops.c b/sys/miscfs/nullfs/null_vfsops.c
index f7656c4..9b7e9da 100644
--- a/sys/miscfs/nullfs/null_vfsops.c
+++ b/sys/miscfs/nullfs/null_vfsops.c
@@ -36,7 +36,7 @@
  *	@(#)null_vfsops.c	8.2 (Berkeley) 1/21/94
  *
  * @(#)lofs_vfsops.c	1.2 (Berkeley) 6/18/92
- * $Id: null_vfsops.c,v 1.4 1994/10/10 07:55:28 phk Exp $
+ * $Id: null_vfsops.c,v 1.5 1995/03/16 18:13:31 bde Exp $
  */
 
 /*
@@ -368,4 +368,4 @@ struct vfsops null_vfsops = {
 	nullfs_init,
 };
 
-VFS_SET(null_vfsops, null, MOUNT_NULL, 0);
+VFS_SET(null_vfsops, null, MOUNT_NULL, VFCF_LOOPBACK);
diff --git a/sys/miscfs/portal/portal_vfsops.c b/sys/miscfs/portal/portal_vfsops.c
index cad30bd..130f991 100644
--- a/sys/miscfs/portal/portal_vfsops.c
+++ b/sys/miscfs/portal/portal_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)portal_vfsops.c	8.6 (Berkeley) 1/21/94
  *
- * $Id: portal_vfsops.c,v 1.5 1994/10/10 07:55:35 phk Exp $
+ * $Id: portal_vfsops.c,v 1.6 1995/03/16 18:13:38 bde Exp $
  */
 
 /*
@@ -315,4 +315,4 @@ struct vfsops portal_vfsops = {
 	portal_init,
 };
 
-VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, 0);
+VFS_SET(portal_vfsops, portal, MOUNT_PORTAL, VFCF_SYNTHETIC);
diff --git a/sys/miscfs/procfs/procfs_vfsops.c b/sys/miscfs/procfs/procfs_vfsops.c
index 4379d0a..b933a18 100644
--- a/sys/miscfs/procfs/procfs_vfsops.c
+++ b/sys/miscfs/procfs/procfs_vfsops.c
@@ -36,7 +36,7 @@
  *
  *	@(#)procfs_vfsops.c	8.4 (Berkeley) 1/21/94
  *
- *	$Id: procfs_vfsops.c,v 1.7 1995/02/20 15:53:33 davidg Exp $
+ *	$Id: procfs_vfsops.c,v 1.8 1995/03/16 18:13:47 bde Exp $
  */
 
 /*
@@ -253,4 +253,4 @@ struct vfsops procfs_vfsops = {
 	procfs_init,
 };
 
-VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, 0);
+VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, VFCF_SYNTHETIC);
diff --git a/sys/miscfs/umapfs/umap_vfsops.c b/sys/miscfs/umapfs/umap_vfsops.c
index 0eeab20..a98ae18 100644
--- a/sys/miscfs/umapfs/umap_vfsops.c
+++ b/sys/miscfs/umapfs/umap_vfsops.c
@@ -35,7 +35,7 @@
  *
  *	@(#)umap_vfsops.c	8.3 (Berkeley) 1/21/94
  *
- * $Id: umap_vfsops.c,v 1.5 1994/10/10 07:55:43 phk Exp $
+ * $Id: umap_vfsops.c,v 1.6 1995/03/16 18:13:55 bde Exp $
  */
 
 /*
@@ -409,5 +409,5 @@ struct vfsops umap_vfsops = {
 	umapfs_init,
 };
 
-VFS_SET(umap_vfsops, umap, MOUNT_UMAP, 0);
+VFS_SET(umap_vfsops, umap, MOUNT_UMAP, VFCF_LOOPBACK);
 
diff --git a/sys/miscfs/union/union_vfsops.c b/sys/miscfs/union/union_vfsops.c
index 4000f98..c9e2c60 100644
--- a/sys/miscfs/union/union_vfsops.c
+++ b/sys/miscfs/union/union_vfsops.c
@@ -35,7 +35,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)union_vfsops.c	8.7 (Berkeley) 3/5/94
- * $Id: union_vfsops.c,v 1.7 1994/11/04 14:41:43 davidg Exp $
+ * $Id: union_vfsops.c,v 1.8 1995/03/16 18:14:02 bde Exp $
  */
 
 /*
@@ -559,4 +559,4 @@ struct vfsops union_vfsops = {
 	union_init,
 };
 
-VFS_SET(union_vfsops, union, MOUNT_UNION, 0);
+VFS_SET(union_vfsops, union, MOUNT_UNION, VFCF_LOOPBACK);
diff --git a/sys/nfs/nfs_vfsops.c b/sys/nfs/nfs_vfsops.c
index 9742bd4..562c953 100644
--- a/sys/nfs/nfs_vfsops.c
+++ b/sys/nfs/nfs_vfsops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vfsops.c	8.3 (Berkeley) 1/4/94
- * $Id: nfs_vfsops.c,v 1.10 1995/01/03 07:44:10 jkh Exp $
+ * $Id: nfs_vfsops.c,v 1.11 1995/03/16 18:15:40 bde Exp $
  */
 
 #include <sys/param.h>
@@ -89,7 +89,7 @@ struct vfsops nfs_vfsops = {
 	nfs_init,
 	nfs_sysctl
 };
-VFS_SET(nfs_vfsops, nfs, MOUNT_NFS, 0);
+VFS_SET(nfs_vfsops, nfs, MOUNT_NFS, VFCF_NETWORK);
 
 /*
  * This structure must be filled in by a primary bootstrap or bootstrap
diff --git a/sys/nfsclient/nfs_vfsops.c b/sys/nfsclient/nfs_vfsops.c
index 9742bd4..562c953 100644
--- a/sys/nfsclient/nfs_vfsops.c
+++ b/sys/nfsclient/nfs_vfsops.c
@@ -34,7 +34,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)nfs_vfsops.c	8.3 (Berkeley) 1/4/94
- * $Id: nfs_vfsops.c,v 1.10 1995/01/03 07:44:10 jkh Exp $
+ * $Id: nfs_vfsops.c,v 1.11 1995/03/16 18:15:40 bde Exp $
  */
 
 #include <sys/param.h>
@@ -89,7 +89,7 @@ struct vfsops nfs_vfsops = {
 	nfs_init,
 	nfs_sysctl
 };
-VFS_SET(nfs_vfsops, nfs, MOUNT_NFS, 0);
+VFS_SET(nfs_vfsops, nfs, MOUNT_NFS, VFCF_NETWORK);
 
 /*
  * This structure must be filled in by a primary bootstrap or bootstrap
diff --git a/sys/sys/mount.h b/sys/sys/mount.h
index 3409c84..ac6a2e6 100644
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)mount.h	8.13 (Berkeley) 3/27/94
- *	$Id: mount.h,v 1.13 1995/03/16 18:16:20 bde Exp $
+ *	$Id: mount.h,v 1.14 1995/03/16 18:31:00 wollman Exp $
  */
 
 #ifndef _SYS_MOUNT_H_
@@ -203,7 +203,15 @@ struct vfsconf {
 	int vfc_flags;
 };
 
+/*
+ * NB: these flags refer to IMPLEMENTATION properties, not properties of
+ * any actual mounts; i.e., it does not make sense to change the flags.
+ */
 #define	VFCF_STATIC	1	/* FS is statically compiled into kernel */
+#define	VFCF_NETWORK	2	/* FS may get data over the network */
+#define	VFCF_READONLY	4	/* writes are not implemented by FS */
+#define VFCF_SYNTHETIC	8	/* data in FS does not represent real files */
+#define	VFCF_LOOPBACK	16	/* FS aliases some other mounted FS */
 
 /*
  * Operations supported on mounted file system.