Teach mount(8) about a 'late' keyword, which means the file system should

not be mounted unless the -l flag was specified.

Add an rc script, mountlate, which basically runs 'mount -a -l'.  It runs
after DAEMON but before LOGIN.

This is useful for things like loopback mounts, because mountcritremote
runs before mountd  / nfsd (since /usr might be a remote file system), so
an attempt to mount a loopback network file system in mountcritremote will
fail.

Also add a progress message to mountcritlocal, for the sake of symmetry
with similar messages in mountcritremote and mountlate.

Reviewed by:	freebsd-rc
MFC after:	3 weeks

2 files changed, 38 insertions, 7 deletions

diff --git a/sbin/mount/mount.8 b/sbin/mount/mount.8
index 47ea621..ec3ca96 100644
--- a/sbin/mount/mount.8
+++ b/sbin/mount/mount.8
@@ -28,7 +28,7 @@
 .\"     @(#)mount.8	8.8 (Berkeley) 6/16/94
 .\" $FreeBSD$
 .\"
-.Dd November 26, 2004
+.Dd July 12, 2006
 .Dt MOUNT 8
 .Os
 .Sh NAME
@@ -36,7 +36,7 @@
 .Nd mount file systems
 .Sh SYNOPSIS
 .Nm
-.Op Fl adfpruvw
+.Op Fl adflpruvw
 .Op Fl F Ar fstab
 .Op Fl o Ar options
 .Op Fl t Ar ufs | external_type
@@ -78,7 +78,12 @@ All the file systems described in
 are mounted.
 Exceptions are those marked as
 .Dq noauto ,
-excluded by the
+those marked as
+.Dq late
+(unless the
+.Fl l
+option was specified),
+those excluded by the
 .Fl t
 flag (see below), or if they are already mounted (except the
 root file system which is always remounted to preserve
@@ -101,6 +106,11 @@ a file system mount status from read-write to read-only.
 Also
 forces the R/W mount of an unclean file system (dangerous; use with
 caution).
+.It Fl l
+When used in conjunction with the
+.Fl a
+option, also mount those file systems which are marked as
+.Dq late .
 .It Fl o
 Options are specified with a
 .Fl o
@@ -142,6 +152,13 @@ When used with the
 flag, this is the same as specifying all the options listed in the
 .Xr fstab 5
 file for the file system.
+.It Cm late
+This file system should be skipped when
+.Nm is run with the
+.Fl a
+flag but without the
+.Fl l
+flag.
 .It Cm multilabel
 Enable multi-label Mandatory Access Control, or MAC, on the specified file
 system.
diff --git a/sbin/mount/mount.c b/sbin/mount/mount.c
index 3da2d73..3d25b7b 100644
--- a/sbin/mount/mount.c
+++ b/sbin/mount/mount.c
@@ -191,17 +191,17 @@ main(int argc, char *argv[])
 	struct statfs *mntbuf;
 	FILE *mountdfp;
 	pid_t pid;
-	int all, ch, i, init_flags, mntsize, rval, have_fstab;
+	int all, ch, i, init_flags, late, mntsize, rval, have_fstab;
 	char *cp, *ep, *options;
 
 	options = strdup("noro");
 	if (options == NULL)
 		errx(1, "malloc failed");
 
-	all = init_flags = 0;
+	all = init_flags = late = 0;
 	vfslist = NULL;
 	vfstype = "ufs";
-	while ((ch = getopt(argc, argv, "adF:fo:prwt:uv")) != -1)
+	while ((ch = getopt(argc, argv, "adlF:fo:prwt:uv")) != -1)
 		switch (ch) {
 		case 'a':
 			all = 1;
@@ -215,6 +215,9 @@ main(int argc, char *argv[])
 		case 'f':
 			init_flags |= MNT_FORCE;
 			break;
+		case 'l':
+			late = 1;
+			break;
 		case 'o':
 			options = catopt(options, optarg);
 			break;
@@ -265,6 +268,8 @@ main(int argc, char *argv[])
 					continue;
 				if (hasopt(fs->fs_mntops, "noauto"))
 					continue;
+				if (hasopt(fs->fs_mntops, "late") && !late)
+					continue;
 				if (!(init_flags & MNT_UPDATE) &&
 				    ismounted(fs, mntbuf, mntsize))
 					continue;
@@ -628,6 +633,15 @@ mangle(char *options, int *argcp, char *argv[])
 				 * not a real mount option.
 				 */
 				continue;
+			} else if (strcmp(p, "late") == 0) {
+				/*
+				 * "late" is used to prevent certain file
+				 * systems from being mounted before late
+				 * in the boot cycle; for instance,
+				 * loopback NFS mounts can't be mounted
+				 * before mountd starts.
+				 */
+				continue;
 			} else if (strcmp(p, "userquota") == 0) {
 				continue;
 			} else if (strncmp(p, userquotaeq,
@@ -737,7 +751,7 @@ usage(void)
 {
 
 	(void)fprintf(stderr, "%s\n%s\n%s\n",
-"usage: mount [-adfpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
+"usage: mount [-adflpruvw] [-F fstab] [-o options] [-t ufs | external_type]",
 "       mount [-dfpruvw] special | node",
 "       mount [-dfpruvw] [-o options] [-t ufs | external_type] special node");
 	exit(1);