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Ignore the fs_spec entry for "/" in /etc/fstab if the device which

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is actually mounted on "/" can be determined using statfs() and is
in /dev.  This fixes fsck operating on the wrong device when the
fs_spec entry is only an alias.  The aliased case became more
dangerous when the ROOTSLICE_HUNT hack was committed in mount(8).
ROOTSLICE_HUNT may be unnecessary now.
This commit is contained in:
Bruce Evans 1999-01-01 14:14:44 +00:00
parent 4e7767c7b9
commit 2e4513990b
1 changed files with 29 additions and 0 deletions
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29
lib/libc/gen/fstab.c
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@ -35,8 +35,13 @@
static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <errno.h>
#include <fstab.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@ -47,8 +52,30 @@ static struct fstab _fs_fstab;
static int LineNo = 0;
static void error __P((int));
static void fixfsfile __P((void));
static int fstabscan __P((void));
static void
fixfsfile()
{
static char buf[sizeof(_PATH_DEV) + MNAMELEN];
struct stat sb;
struct statfs sf;
if (strcmp(_fs_fstab.fs_file, "/") != 0)
return;
if (statfs("/", &sf) != 0)
return;
if (sf.f_mntfromname[0] == '/')
buf[0] = '\0';
else
strcpy(buf, _PATH_DEV);
strcat(buf, sf.f_mntfromname);
if (stat(buf, &sb) != 0 || !S_ISBLK(sb.st_mode))
return;
_fs_fstab.fs_spec = buf;
}
static int
fstabscan()
{
@ -69,6 +96,7 @@ fstabscan()
if (!strpbrk(p, " \t")) {
_fs_fstab.fs_spec = strsep(&p, ":\n");
_fs_fstab.fs_file = strsep(&p, ":\n");
fixfsfile();
_fs_fstab.fs_type = strsep(&p, ":\n");
if (_fs_fstab.fs_type) {
if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
@ -96,6 +124,7 @@ fstabscan()
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_file = cp;
fixfsfile();
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_vfstype = cp;