From 9655c24691072dc162e49cfa5604c11e98b545d9 Mon Sep 17 00:00:00 2001
From: christos <christos@NetBSD.org>
Date: Thu, 9 Apr 2020 14:44:38 +0000
Subject: [PATCH] Refresh the superblock in memory if changing a mounted
 partition.

---
 sbin/tunefs/tunefs.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/sbin/tunefs/tunefs.c b/sbin/tunefs/tunefs.c
index 1e819d2efd19..a0a7382b0c16 100644
--- a/sbin/tunefs/tunefs.c
+++ b/sbin/tunefs/tunefs.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: tunefs.c,v 1.50 2019/04/12 01:14:37 pgoyette Exp $	*/
+/*	$NetBSD: tunefs.c,v 1.51 2020/04/09 14:44:38 christos Exp $	*/
 
 /*
  * Copyright (c) 1983, 1993
@@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
 #if 0
 static char sccsid[] = "@(#)tunefs.c	8.3 (Berkeley) 5/3/95";
 #else
-__RCSID("$NetBSD: tunefs.c,v 1.50 2019/04/12 01:14:37 pgoyette Exp $");
+__RCSID("$NetBSD: tunefs.c,v 1.51 2020/04/09 14:44:38 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -47,10 +47,12 @@ __RCSID("$NetBSD: tunefs.c,v 1.50 2019/04/12 01:14:37 pgoyette Exp $");
  * tunefs: change layout parameters to an existing file system.
  */
 #include <sys/param.h>
+#include <sys/statvfs.h>
 
 #include <ufs/ffs/fs.h>
 #include <ufs/ffs/ffs_extern.h>
 #include <ufs/ufs/ufs_wapbl.h>
+#include <ufs/ufs/ufsmount.h>
 #include <ufs/ufs/quota2.h>
 
 #include <machine/bswap.h>
@@ -103,9 +105,10 @@ main(int argc, char *argv[])
 	const char	*special, *chg[2];
 	char		device[MAXPATHLEN];
 	int		maxbpg, minfree, optim, secsize;
-	int		avgfilesize, avgfpdir;
+	int		avgfilesize, avgfpdir, active;
 	long long	logfilesize;
 	int		secshift, fsbtodb;
+	struct statvfs	sfs;
 
 	Aflag = Fflag = Nflag = 0;
 	maxbpg = minfree = optim = secsize = -1;
@@ -203,6 +206,7 @@ main(int argc, char *argv[])
 		fi = openpartition(special, openflags, device, sizeof(device));
 		special = device;
 	}
+	active = fstatvfs(fi, &sfs) != -1;
 	if (fi == -1)
 		err(1, "%s", special);
 	getsb(&sblock, special);
@@ -365,6 +369,18 @@ main(int argc, char *argv[])
 	/* write superblock to original coordinates (use old dev_bsize!) */
 	bwrite(sblockloc, buf.data, SBLOCKSIZE, special);
 
+	if (active) {
+		struct ufs_args args;
+		args.fspec = sfs.f_mntfromname;
+		if (mount(MOUNT_FFS, sfs.f_mntonname, sfs.f_flag | MNT_UPDATE,
+		     &args, sizeof args) == -1)
+			 warn("mount");
+		else
+			printf("%s: mount of %s on %s updated\n",
+			    getprogname(), sfs.f_mntfromname, sfs.f_mntonname);
+	}
+
+
 	/* correct dev_bsize from possibly changed superblock data */
 	dev_bsize = sblock.fs_fsize / FFS_FSBTODB(&sblock, 1);