pretty good attempt at supporting nullfs

1 files changed, 84 insertions, 3 deletions

diff --git a/usr.bin/fstat/fstat.c b/usr.bin/fstat/fstat.c
index 7d982c87341..c99d12b1b28 100644
--- a/usr.bin/fstat/fstat.c
+++ b/usr.bin/fstat/fstat.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: fstat.c,v 1.22 1999/04/30 02:26:59 art Exp $	*/
+/*	$OpenBSD: fstat.c,v 1.23 1999/07/01 21:41:58 deraadt Exp $	*/
 
 /*-
  * Copyright (c) 1988, 1993
@@ -41,7 +41,7 @@ static char copyright[] =
 
 #ifndef lint
 /*static char sccsid[] = "from: @(#)fstat.c	8.1 (Berkeley) 6/6/93";*/
-static char *rcsid = "$OpenBSD: fstat.c,v 1.22 1999/04/30 02:26:59 art Exp $";
+static char *rcsid = "$OpenBSD: fstat.c,v 1.23 1999/07/01 21:41:58 deraadt Exp $";
 #endif /* not lint */
 
 #include <sys/param.h>
@@ -57,13 +57,14 @@ static char *rcsid = "$OpenBSD: fstat.c,v 1.22 1999/04/30 02:26:59 art Exp $";
 #include <sys/unpcb.h>
 #include <sys/sysctl.h>
 #include <sys/filedesc.h>
+#include <sys/mount.h>
 #define	_KERNEL
 #include <sys/file.h>
 #include <ufs/ufs/quota.h>
 #include <ufs/ufs/inode.h>
+#include <miscfs/nullfs/null.h>
 #undef _KERNEL
 #define NFS
-#include <sys/mount.h>
 #include <nfs/nfsproto.h>
 #include <nfs/rpcv2.h>
 #include <nfs/nfs.h>
@@ -412,6 +413,10 @@ vtrans(vp, i, flag)
 			if (!xfs_filestat(&vn, &fst))
 				badtype = "error";
 			break;
+		case VT_NULL:
+			if (!null_filestat(&vn, &fst))
+				badtype = "error";
+			break;		
 		default: {
 			static char unknown[30];
 			sprintf(badtype = unknown, "?(%x)", vn.v_tag);
@@ -604,6 +609,82 @@ xfs_filestat(vp, fsp)
 	return 1;
 }
 
+int
+null_filestat(vp, fsp)
+	struct vnode *vp;
+	struct filestat *fsp;
+{
+	struct null_node node;
+	struct filestat fst;
+	struct vnode vn;
+	int fail = 1;
+
+	memset(&fst, 0, sizeof fst);
+
+	if (!KVM_READ(VTONULL(vp), &node, sizeof (node))) {
+		dprintf("can't read node at %p for pid %d", VTONULL(vp), Pid);
+		return 0;
+	}
+
+	/*
+	 * Attempt to find information that might be useful.
+	 */
+	if (node.null_lowervp) {
+		if (!KVM_READ(node.null_lowervp, &vn, sizeof (vn))) {
+			dprintf("can't read vnode at %p for pid %d",
+			    node.null_lowervp, Pid);
+			return 0;
+		}
+
+		fail = 0;
+		if (vn.v_type == VNON || vn.v_tag == VT_NON)
+			fail = 1;
+		else if (vn.v_type == VBAD)
+			fail = 1;
+		else
+			switch (vn.v_tag) {
+			case VT_UFS:
+			case VT_MFS:
+				if (!ufs_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			case VT_NFS:
+				if (!nfs_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			case VT_EXT2FS:
+				if (!ext2fs_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			case VT_ISOFS:
+				if (!isofs_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			case VT_MSDOSFS:
+				if (!msdos_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			case VT_XFS:
+				if (!xfs_filestat(&vn, &fst))
+					fail = 1;
+				break;
+			default:
+				break;
+			}
+	}
+
+	fsp->fsid = (long)node.null_vnode;
+	if (fail)
+		fsp->fileid = (long)node.null_lowervp;
+	else
+		fsp->fileid = fst.fileid; 
+	fsp->mode = fst.mode;
+	fsp->size = fst.mode;
+	fsp->rdev = fst.mode;
+
+	return 1;
+}
+
 char *
 getmnton(m)
 	struct mount *m;