diff options
Diffstat (limited to 'sys/boot/i386/installboot/getmount.c')
| -rw-r--r-- | sys/boot/i386/installboot/getmount.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/sys/boot/i386/installboot/getmount.c b/sys/boot/i386/installboot/getmount.c new file mode 100644 index 0000000..6aa8427 --- /dev/null +++ b/sys/boot/i386/installboot/getmount.c @@ -0,0 +1,156 @@ +/* $NetBSD: getmount.c,v 1.3 1998/03/01 13:22:55 fvdl Exp $ */ + +/* + * Copyright (c) 1996 + * Matthias Drochner. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed for the NetBSD Project + * by Matthias Drochner. + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <sys/param.h> +#include <sys/mount.h> +#include <ufs/ufs/ufsmount.h> +#include <sys/stat.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <err.h> + +#include "installboot.h" + +static int tempmounted = 0; + +/* make block device name from character device name */ +static char * +getbdev(dev) + char *dev; +{ + static char bdiskdev[MAXPATHLEN]; + + if (strncmp(dev, "/dev/r", 6)) { + warnx("bad device name %s", dev); + return (0); + } + sprintf(bdiskdev, "/dev/%s", dev + 6); + return (bdiskdev); +} + +/* + * create mountpoint and mount given block device there, return + * mountpoint + */ +static char * +dotempmount(bdiskdev) + char *bdiskdev; +{ + static char dir[] = "/tmp/installbootXXXXXX"; + struct ufs_args data; + + if (mktemp(dir) == NULL) { + warnx("mktemp failed"); + return (0); + } + if (mkdir(dir, 0700)) { + warn("could not create temporary dir %s", dir); + return (0); + } + bzero(&data, sizeof(data)); + data.fspec = bdiskdev; + + /* this code if FFS only */ + if (mount("ufs", dir, 0, &data) == -1) { + warn("mount %s->%s failed", bdiskdev, dir); + rmdir(dir); + return (0); + } + if (verbose) + fprintf(stderr, "mounted %s at %s\n", bdiskdev, dir); + tempmounted = 1; + return (dir); +} + +/* + * Find out if given character device is already mounted. If not, mount it + * temporarily. + */ +char * +getmountpoint(diskdev) + char *diskdev; +{ + char *bdiskdev; + struct statfs *buf; + int num, i; + + bdiskdev = getbdev(diskdev); + if (bdiskdev == NULL) + return (0); + + num = getmntinfo(&buf, MNT_WAIT); + if (num == 0) { + warn("getmntinfo"); + return (0); + } + for (i = 0; i < num; i++) + if (strncmp(bdiskdev, buf[i].f_mntfromname, MNAMELEN) == 0) { + int j; + + /* Device is mounted. If there are more devices mounted + at the same point, the fs could be hidden. Don't think + too much about layering order - simply refuse. */ + for (j = 0; j < num; j++) + if ((i != j) && (strncmp(buf[i].f_mntonname, + buf[j].f_mntonname, + MNAMELEN) == 0)) { + warnx("there is more than 1 mount at %s", + buf[i].f_mntonname); + return (0); + } + /* this code is FFS only */ + if (strncmp(buf[i].f_fstypename, "ufs", MFSNAMELEN)) { + warnx("%s: must be a FFS filesystem", bdiskdev); + return (0); + } + return (buf[i].f_mntonname); + } + if (verbose) + fprintf(stderr, "%s is not mounted\n", bdiskdev); + return (dotempmount(bdiskdev)); +} + +void +cleanupmount(dir) + char *dir; +{ + if (tempmounted) { + if (verbose) + fprintf(stderr, "unmounting\n"); + unmount(dir, 0); + rmdir(dir); + tempmounted = 0; + } +} |
