[src/trunk]: src/sbin/tunefs Find the if a device points to an active filesys...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/103baeeb92d4
branches:  trunk
changeset: 1012693:103baeeb92d4
user:      christos <christos%NetBSD.org@localhost>
date:      Sat Aug 08 11:44:55 2020 +0000

description:
Find the if a device points to an active filesystem by looking at the mount
list.

diffstat:

 sbin/tunefs/tunefs.c |  36 +++++++++++++++++++++++++++++++++---
 1 files changed, 33 insertions(+), 3 deletions(-)

diffs (73 lines):

diff -r 4f8c13f098af -r 103baeeb92d4 sbin/tunefs/tunefs.c
--- a/sbin/tunefs/tunefs.c      Fri Aug 07 23:31:07 2020 +0000
+++ b/sbin/tunefs/tunefs.c      Sat Aug 08 11:44:55 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: tunefs.c,v 1.52 2020/05/16 18:31:47 christos Exp $     */
+/*     $NetBSD: tunefs.c,v 1.53 2020/08/08 11:44:55 christos Exp $     */
 
 /*
  * Copyright (c) 1983, 1993
@@ -39,7 +39,7 @@
 #if 0
 static char sccsid[] = "@(#)tunefs.c   8.3 (Berkeley) 5/3/95";
 #else
-__RCSID("$NetBSD: tunefs.c,v 1.52 2020/05/16 18:31:47 christos Exp $");
+__RCSID("$NetBSD: tunefs.c,v 1.53 2020/08/08 11:44:55 christos Exp $");
 #endif
 #endif /* not lint */
 
@@ -95,6 +95,7 @@
 static void    change_log_info(long long);
 static void    getsb(struct fs *, const char *);
 static int     openpartition(const char *, int, char *, size_t);
+static int     isactive(int, struct statvfs *);
 static void    show_log_info(void);
 __dead static  void    usage(void);
 
@@ -233,9 +234,9 @@
                fi = openpartition(special, openflags, device, sizeof(device));
                special = device;
        }
-       active = fstatvfs(fi, &sfs) != -1;
        if (fi == -1)
                err(1, "%s", special);
+       active = !Fflag && isactive(fi, &sfs);
        getsb(&sblock, special);
 
 #define CHANGEVAL(old, new, type, suffix) do                           \
@@ -469,6 +470,35 @@
        exit(0);
 }
 
+static int
+isactive(int fd, struct statvfs *rsfs)
+{
+       struct stat st0, st;
+       struct statvfs *sfs;
+       int n;
+
+       if (fstat(fd, &st0) == -1) {
+               warn("stat");
+               return 0;
+       }
+
+       if ((n = getmntinfo(&sfs, 0)) == -1) {
+               warn("getmntinfo");
+               return 0;
+       }
+
+       for (int i = 0; i < n; i++) {
+               if (stat(sfs[i].f_mntfromname, &st) == -1)
+                       continue;
+               if (st.st_rdev != st0.st_rdev)
+                       continue;
+               *rsfs = sfs[i];
+               return 1;
+
+       }
+       return 0;
+}
+
 static void
 show_log_info(void)
 {