patch to du to restrict to one file-system

[Alan P. Sexton]

In article <294 at mars.UUCP> rich at cfi.COM (Rich Baughman -CFI-) writes:
>How many times have you frantically had to answer this question:
>
>    "Who is using up all the #&$%@ space on this disk?!".
>
>This happens to us all the time.  Does anyone know of the existence of a
>program like 'du' that shows disk use by directory for a specific file system
>(i.e., one that does not traverse mounted file systems)?

I include a context diff to add a -d argument to du. With this arg
du will report 0 size for any directory being used as a mount point
and it will not traverse the mounted filesystem. The sources are for
BSD4.[23] on a Vax. We've been running this for some years on our
systems without problems.

Note that any files you have in the mount point directory do not show
up to du or ls even though they do take up real disk space which is reported
by df. This can be a source of missing disk space (/tmp is particularly
prone to this problem if you mount a separate file system on it: i.e.
do some work in single user mode or with /tmp otherwise unmounted
and forget to clear out the /tmp mount point before going multiuser. On going
multiuser the /tmp filesystem is mounted over the /tmp mount point
and you no longer see the files you used to have in /tmp).

>BTW, we do not have a source license, so those
>solutions are out.

Sorry: maybe someone will include it as a standard feature in the next release.

Warning: the line numbers may be different to your sources.

*** du.c.orig	Fri Sep 23 10:11:38 1988
--- du.c	Tue May 26 10:20:57 1987
***************
*** 1,6 ****
--- 1,7 ----
  #ifndef lint
  static char *sccsid = "@(#)du.c	4.11 (Berkeley) 7/1/83";
  #endif
+ #define ECRC
  
  #include <stdio.h>
  #include <sys/param.h>
***************
*** 10,15 ****
--- 11,21 ----
  char	path[BUFSIZ], name[BUFSIZ];
  int	aflg;
  int	sflg;
+ #ifdef ECRC
+ 	/* APS: added arg '-d' to restrict a search to one disk filesystem */
+ int	dflg; 
+ int	orig_dev = -1 ;
+ #endif
  
  char	*dot = ".";
  
***************
*** 45,50 ****
--- 51,64 ----
  		argc--, argv++;
  		goto again;
  	}
+ #ifdef ECRC
+ 		/* APS: '-d' addition */
+ 	if (argc && !strcmp(*argv, "-d")) {
+ 		dflg++;
+ 		argc--, argv++;
+ 		goto again;
+ 	}
+ #endif
  	if (argc == 0) {
  		argv = ˙
  		argc = 1;
***************
*** 102,107 ****
--- 116,135 ----
  		*ebase0 = 0;
  		return (0);
  	}
+ #ifdef ECRC
+ 		/* APS: '-d' addition */
+ 	if (dflg)
+ 	{
+ 		if (orig_dev == -1)
+ 			orig_dev = stb.st_dev ;
+ 		else if (stb.st_dev != orig_dev)
+ 		{
+ 			if (sflg == 0)
+ 				printf("%ld\t%s\n", 0l, base);
+ 			return (0) ;
+ 		}
+ 	}
+ #endif
  	if (stb.st_nlink > 1 && (stb.st_mode&S_IFMT) != S_IFDIR) {
  		for (i = 0; i <= mlx; i++)
  			if (ml[i].ino == stb.st_ino && ml[i].dev == stb.st_dev)