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Date:      Thu, 9 Nov 2000 23:35:08 +1100 (EST)
From:      Bruce Evans <bde@zeta.org.au>
To:        Clive Lin <clive@CirX.ORG>
Cc:        Adrian Chadd <adrian@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sbin/badsect badsect.c
Message-ID:  <Pine.BSF.4.21.0011092300120.8223-100000@besplex.bde.org>
In-Reply-To: <20001109173927.B67472@educampus.ncl.edu.tw>
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On Thu, 9 Nov 2000, Clive Lin wrote:

>     Is it ok to close this PR ? bde talks too much , more than I could
> catch :(
> 
>     http://www.FreeBSD.org/cgi/query-pr.cgi?pr=19574

My point in the followup about lots of dead code still applies.  badsect
used a readdir() loop instead of just statfs() because it wanted to find
the character device corresponding to the mounted-on block device and
not just the mounted-on device.  This is now bogus.

Lightly tested fixes relative to rev.1.8:

---
diff -c2 badsect.c~ badsect.c
*** badsect.c~	Thu Nov  9 22:55:28 2000
--- badsect.c	Thu Nov  9 23:15:17 2000
***************
*** 57,61 ****
   */
  #include <sys/param.h>
! #include <sys/stat.h>
  
  #include <ufs/ffs/fs.h>
--- 57,61 ----
   */
  #include <sys/param.h>
! #include <sys/mount.h>
  
  #include <ufs/ffs/fs.h>
***************
*** 63,71 ****
  
  #include <err.h>
- #include <dirent.h>
  #include <fcntl.h>
  #include <paths.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  
--- 63,71 ----
  
  #include <err.h>
  #include <fcntl.h>
  #include <paths.h>
  #include <stdio.h>
  #include <stdlib.h>
+ #include <string.h>
  #include <unistd.h>
  
***************
*** 104,134 ****
  	daddr_t diskbn;
  	daddr_t number;
! 	struct stat stbuf, devstat;
! 	register struct dirent *dp;
! 	DIR *dirp;
! 	char name[2 * MAXPATHLEN];
! 	char *name_dir_end;
  
  	if (argc < 3)
  		usage();
! 	if (chdir(argv[1]) < 0 || stat(".", &stbuf) < 0)
  		err(2, "%s", argv[1]);
! 	strcpy(name, _PATH_DEV);
! 	if ((dirp = opendir(name)) == NULL)
! 		err(3, "%s", name);
! 	name_dir_end = name + strlen(name);
! 	while ((dp = readdir(dirp)) != NULL) {
! 		strcpy(name_dir_end, dp->d_name);
! 		if (lstat(name, &devstat) < 0)
! 			err(4, "%s", name);
! 		if (stbuf.st_dev == devstat.st_rdev &&
! 		    (devstat.st_mode & IFMT) == IFCHR)
! 			break;
! 	}
! 	closedir(dirp);
! 	if (dp == NULL) {
! 		printf("Cannot find dev 0%lo corresponding to %s\n",
! 		    (u_long)stbuf.st_rdev, argv[1]);
! 		exit(5);
  	}
  	if ((fsi = open(name, O_RDONLY)) < 0)
--- 104,122 ----
  	daddr_t diskbn;
  	daddr_t number;
! 	struct statfs sfb;
! 	char namebuf[sizeof(_PATH_DEV) - 1 + MNAMELEN];
! 	char *name;
  
  	if (argc < 3)
  		usage();
! 	if (chdir(argv[1]) < 0 || statfs(".", &sfb) < 0)
  		err(2, "%s", argv[1]);
! 	if (strcmp(sfb.f_fstypename, "ufs") != 0)
! 		errx(2, "badsect only works on ufs filesystems");
! 	name = sfb.f_mntfromname;
! 	if (*name != '/') {
! 		strcpy(namebuf, _PATH_DEV);
! 		strcat(namebuf, name);
! 		name = namebuf;
  	}
  	if ((fsi = open(name, O_RDONLY)) < 0)
---

Bruce



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