Added filesystem clean bit support. This only affects fsck during a

preen (-p), and in that case the filesystem is skipped if it is clean.
A new flag "-f" for 'force' has been added which basically gives back
the old behavior of checking all the filesystems all the time. This
very closely models the behavior of SunOS and Ultrix.

3 files changed, 28 insertions, 2 deletions

diff --git a/sbin/fsck_ffs/fsck.h b/sbin/fsck_ffs/fsck.h
index 7fa831f..0a49e4c 100644
--- a/sbin/fsck_ffs/fsck.h
+++ b/sbin/fsck_ffs/fsck.h
@@ -164,6 +164,7 @@ long numdirs, listmax, inplast;
 char	*cdevname;		/* name of device being checked */
 long	dev_bsize;		/* computed value of DEV_BSIZE */
 long	secsize;		/* actual disk sector size */
+char	fflag;			/* force fs check (ignore clean flag) */
 char	nflag;			/* assume a no response */
 char	yflag;			/* assume a yes response */
 int	bflag;			/* location of alternate super block */
diff --git a/sbin/fsck_ffs/fsck_ffs.8 b/sbin/fsck_ffs/fsck_ffs.8
index cf8c499..94e31ef 100644
--- a/sbin/fsck_ffs/fsck_ffs.8
+++ b/sbin/fsck_ffs/fsck_ffs.8
@@ -40,6 +40,7 @@
 .Sh SYNOPSIS
 .Nm fsck
 .Fl p
+.Op Fl f
 .Op Fl m Ar mode
 .Nm fsck
 .Op Fl b Ar block#
@@ -72,6 +73,12 @@ The disk drive containing each filesystem is inferred from the longest prefix
 of the device name that ends in a digit; the remaining characters are assumed
 to be the partition designator.
 .Pp
+The clean flag of each filesystem's superblock is examined and only those filesystems that
+are not marked clean are checked. If the
+.Fl f
+option is specified, the filesystems
+will be checked regardless of the state of their clean flag.
+.Pp
 The kernel takes care that only a restricted class of innocuous filesystem
 inconsistencies can happen unless hardware or software failures intervene.
 These are limited to the following:
diff --git a/sbin/fsck_ffs/main.c b/sbin/fsck_ffs/main.c
index 2e69715..f2dba1c 100644
--- a/sbin/fsck_ffs/main.c
+++ b/sbin/fsck_ffs/main.c
@@ -43,6 +43,7 @@ static char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/23/94";
 
 #include <sys/param.h>
 #include <sys/time.h>
+#include <sys/proc.h>
 #include <sys/mount.h>
 #include <ufs/ufs/dinode.h>
 #include <ufs/ffs/fs.h>
@@ -67,7 +68,7 @@ main(argc, argv)
 	extern int optind;
 
 	sync();
-	while ((ch = getopt(argc, argv, "dpnNyYb:c:l:m:")) != EOF) {
+	while ((ch = getopt(argc, argv, "dfpnNyYb:c:l:m:")) != EOF) {
 		switch (ch) {
 		case 'p':
 			preen++;
@@ -86,6 +87,10 @@ main(argc, argv)
 			debug++;
 			break;
 
+		case 'f':
+			fflag++;
+			break;
+
 		case 'l':
 			maxrun = argtoi('l', "number", optarg, 10);
 			break;
@@ -182,6 +187,18 @@ checkfilesys(filesys, mntpt, auxdata, child)
 			pfatal("CAN'T CHECK FILE SYSTEM.");
 		return (0);
 	}
+
+	if (preen && sblock.fs_clean && !fflag) {
+		pwarn("clean, %ld free ", sblock.fs_cstotal.cs_nffree +
+			sblock.fs_frag * sblock.fs_cstotal.cs_nbfree);
+		printf("(%ld frags, %ld blocks, %.1f%% fragmentation)\n",
+			sblock.fs_cstotal.cs_nffree,
+			sblock.fs_cstotal.cs_nbfree,
+			(float)(sblock.fs_cstotal.cs_nffree * 100) /
+			sblock.fs_dsize);
+		return(0);
+	}
+
 	/*
 	 * 1: scan inodes tallying blocks used
 	 */
@@ -268,7 +285,8 @@ checkfilesys(filesys, mntpt, auxdata, child)
 	duplist = (struct dups *)0;
 	muldup = (struct dups *)0;
 	inocleanup();
-	if (fsmodified) {
+	if (fsmodified || (!sblock.fs_clean && preen && !nflag && !hotroot)) {
+		sblock.fs_clean = 1;
 		(void)time(&sblock.fs_time);
 		sbdirty();
 	}