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If we are mounting the root filesystem, and we're accessing it through

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something that might refer to the compatability slice rather than the
correct slice entry, try all the possible slice entries first.

This is a compatability hack to deal with the case where the kernel has
correctly mounted the root filesystem out of its slice, but the user
has not updated their /etc/fstab file to reflect this.  A diagnostic
is emitted if the mount succeeds, indicating that the file should be
updated.

This is a prelude to fixing the kernel to behave as alluded to above.
Reviewed by:	(discussed with) julian, phk
This commit is contained in:
Mike Smith 1998-03-08 14:50:04 +00:00
parent e8eb82a81c
commit 95f37fa61f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=34304
4 changed files with 76 additions and 6 deletions
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5
sbin/mount/Makefile
View File

@ -1,9 +1,12 @@
# @(#)Makefile 8.6 (Berkeley) 5/8/95
# $Id: Makefile,v 1.5 1997/08/25 20:38:35 bde Exp $
# $Id: Makefile,v 1.6 1998/01/20 10:39:57 bde Exp $
PROG= mount
SRCS= mount.c mount_ufs.c getmntopts.c vfslist.c
MAN8= mount.8
# We do NOT install the getmntopts.3 man page.
# We support the ROOTSLICE_HUNT hack
CFLAGS+=-DROOTSLICE_HUNT
.include <bsd.prog.mk>

36
sbin/mount/mount_ufs.c
View File

@ -42,7 +42,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)mount_ufs.c 8.4 (Berkeley) 4/26/95";
#else
static const char rcsid[] =
"$Id: mount_ufs.c,v 1.9 1997/08/24 21:02:50 steve Exp $";
"$Id: mount_ufs.c,v 1.10 1997/08/25 21:14:22 bde Exp $";
#endif
#endif /* not lint */
@ -83,6 +83,10 @@ mount_ufs(argc, argv)
char *fs_name;
struct vfsconf vfc;
int error = 0;
#ifdef ROOTSLICE_HUNT
int slice, part, result;
char devbuf[MAXPATHLEN], devpfx[MAXPATHLEN];
#endif
mntflags = 0;
optind = optreset = 1; /* Reset for parse of new argv. */
@ -124,8 +128,36 @@ mount_ufs(argc, argv)
warnx("ufs filesystem is not available");
return (1);
}
#ifdef ROOTSLICE_HUNT
result = -1;
/*
* If we are mounting root, and we have a mount of something that
* might be the compatability slice, try mounting other slices
* first. If the kernel has done the right thing and mounted
* the slice because the disk is really sliced, this will find
* the real root filesystem. If not, we'll try what was supplied.
*/
if (!strcmp(fs_name, "/") &&
(sscanf(args.fspec, "%[^0-9]%d%c", devpfx, &unit, &part) == 3) &&
(part >= 'a') &&
(part <= 'h')) {
for (slice = 1; (slice < 32) && (result < 0); slice++) {
sprintf(devbuf, "%s%ds%d%c",
devpfx, unit, slice, part);
args.fspec = devbuf;
result = mount(vfc.vfc_name, fs_name, mntflags, &args);
}
args.fspec = argv[0];
}
if (result == 0)
warnx("*** update /etc/fstab entry for %s to use %s ***",
fs_name, devbuf);
/* Try the mount as originally requested */
if ((result < 0) &&
(mount(vfc.vfc_name, fs_name, mntflags, &args < 0)) {
#else
if (mount(vfc.vfc_name, fs_name, mntflags, &args) < 0) {
#endif
(void)fprintf(stderr, "%s on %s: ", args.fspec, fs_name);
switch (errno) {
case EMFILE:

5
sbin/mount_ifs/Makefile
View File

@ -1,9 +1,12 @@
# @(#)Makefile 8.6 (Berkeley) 5/8/95
# $Id: Makefile,v 1.5 1997/08/25 20:38:35 bde Exp $
# $Id: Makefile,v 1.6 1998/01/20 10:39:57 bde Exp $
PROG= mount
SRCS= mount.c mount_ufs.c getmntopts.c vfslist.c
MAN8= mount.8
# We do NOT install the getmntopts.3 man page.
# We support the ROOTSLICE_HUNT hack
CFLAGS+=-DROOTSLICE_HUNT
.include <bsd.prog.mk>

36
sbin/mount_ifs/mount_ufs.c
View File

@ -42,7 +42,7 @@ static const char copyright[] =
static char sccsid[] = "@(#)mount_ufs.c 8.4 (Berkeley) 4/26/95";
#else
static const char rcsid[] =
"$Id: mount_ufs.c,v 1.9 1997/08/24 21:02:50 steve Exp $";
"$Id: mount_ufs.c,v 1.10 1997/08/25 21:14:22 bde Exp $";
#endif
#endif /* not lint */
@ -83,6 +83,10 @@ mount_ufs(argc, argv)
char *fs_name;
struct vfsconf vfc;
int error = 0;
#ifdef ROOTSLICE_HUNT
int slice, part, result;
char devbuf[MAXPATHLEN], devpfx[MAXPATHLEN];
#endif
mntflags = 0;
optind = optreset = 1; /* Reset for parse of new argv. */
@ -124,8 +128,36 @@ mount_ufs(argc, argv)
warnx("ufs filesystem is not available");
return (1);
}
#ifdef ROOTSLICE_HUNT
result = -1;
/*
* If we are mounting root, and we have a mount of something that
* might be the compatability slice, try mounting other slices
* first. If the kernel has done the right thing and mounted
* the slice because the disk is really sliced, this will find
* the real root filesystem. If not, we'll try what was supplied.
*/
if (!strcmp(fs_name, "/") &&
(sscanf(args.fspec, "%[^0-9]%d%c", devpfx, &unit, &part) == 3) &&
(part >= 'a') &&
(part <= 'h')) {
for (slice = 1; (slice < 32) && (result < 0); slice++) {
sprintf(devbuf, "%s%ds%d%c",
devpfx, unit, slice, part);
args.fspec = devbuf;
result = mount(vfc.vfc_name, fs_name, mntflags, &args);
}
args.fspec = argv[0];
}
if (result == 0)
warnx("*** update /etc/fstab entry for %s to use %s ***",
fs_name, devbuf);
/* Try the mount as originally requested */
if ((result < 0) &&
(mount(vfc.vfc_name, fs_name, mntflags, &args < 0)) {
#else
if (mount(vfc.vfc_name, fs_name, mntflags, &args) < 0) {
#endif
(void)fprintf(stderr, "%s on %s: ", args.fspec, fs_name);
switch (errno) {
case EMFILE: