Add the '-C' "check clean" flag. If the FS is marked clean, skip file

system checking.  However, if the file system is not clean, perform a
full fsck.

Reviewed by:	delphij
Obtained from:	Juniper Networks

3 files changed, 13 insertions, 4 deletions

diff --git a/sbin/fsck/fsck.8 b/sbin/fsck/fsck.8
index b7360d9bd8c0..a4f6d4b0cca1 100644
--- a/sbin/fsck/fsck.8
+++ b/sbin/fsck/fsck.8
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd April 25, 2001
+.Dd January 25, 2009
 .Dt FSCK 8
 .Os
 .Sh NAME
@@ -37,7 +37,7 @@
 .Nd file system consistency check and interactive repair
 .Sh SYNOPSIS
 .Nm
-.Op Fl dfnpvy
+.Op Fl Cdfnpvy
 .Op Fl B | F
 .Op Fl T Ar fstype : Ns Ar fsoptions
 .Op Fl t Ar fstype
@@ -112,6 +112,11 @@ to be the partition and slice designators.
 .Pp
 The options are as follows:
 .Bl -tag -width indent
+.It Fl C
+Check if the
+.Dq clean
+flag is set in the superblock and skip file system checks if file system was
+properly dismounted and marked clean.
 .It Fl d
 Debugging mode.
 Just print the commands without executing them.
diff --git a/sbin/fsck/fsck.c b/sbin/fsck/fsck.c
index 490a29af919a..13eb9f06e067 100644
--- a/sbin/fsck/fsck.c
+++ b/sbin/fsck/fsck.c
@@ -103,7 +103,7 @@ main(int argc, char *argv[])
 	TAILQ_INIT(&selhead);
 	TAILQ_INIT(&opthead);
 
-	while ((i = getopt(argc, argv, "BdvpfFnyl:t:T:")) != -1)
+	while ((i = getopt(argc, argv, "BCdvpfFnyl:t:T:")) != -1)
 		switch (i) {
 		case 'B':
 			if (flags & CHECK_BACKGRD)
@@ -128,6 +128,9 @@ main(int argc, char *argv[])
 		case 'p':
 			flags |= CHECK_PREEN;
 			/*FALLTHROUGH*/
+		case 'C':
+			flags |= CHECK_CLEAN;
+			/*FALLTHROUGH*/
 		case 'n':
 		case 'y':
 			globopt[1] = i;
@@ -566,7 +569,7 @@ static void
 usage(void)
 {
 	static const char common[] =
-	    "[-dfnpvy] [-B | -F] [-T fstype:fsoptions] [-t fstype]";
+	    "[-Cdfnpvy] [-B | -F] [-T fstype:fsoptions] [-t fstype]";
 
 	(void)fprintf(stderr, "usage: %s %s [special | node] ...\n",
 	    getprogname(), common);
diff --git a/sbin/fsck/fsutil.h b/sbin/fsck/fsutil.h
index 84e72909592d..657668ede4ce 100644
--- a/sbin/fsck/fsutil.h
+++ b/sbin/fsck/fsutil.h
@@ -48,6 +48,7 @@ char *estrdup(const char *);
 #define	CHECK_DEBUG	0x0004
 #define	CHECK_BACKGRD	0x0008
 #define	DO_BACKGRD	0x0010
+#define	CHECK_CLEAN	0x0020
 
 struct fstab;
 int checkfstab(int, int (*)(struct fstab *),