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freebsd-skq/usr.sbin/vnconfig/vnconfig.c

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/*
* Copyright (c) 1993 University of Utah.
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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 by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* from: Utah $Hdr: vnconfig.c 1.1 93/12/15$
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)vnconfig.c 8.1 (Berkeley) 12/15/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/linker.h>
#include <sys/mount.h>
#include <sys/module.h>
#include <sys/stat.h>
#include <sys/vnioctl.h>
#include <ufs/ufs/ufsmount.h>
#define MAXVNDISK 16
#define LINESIZE 1024
#define ZBUFSIZE 32768
struct vndisk {
char *dev;
char *file;
char *autolabel;
int flags;
int size;
char *oarg;
} vndisks[MAXVNDISK];
#define VN_CONFIG 0x01
#define VN_UNCONFIG 0x02
#define VN_ENABLE 0x04
#define VN_DISABLE 0x08
#define VN_SWAP 0x10
#define VN_MOUNTRO 0x20
#define VN_MOUNTRW 0x40
#define VN_IGNORE 0x80
#define VN_SET 0x100
#define VN_RESET 0x200
#define VN_TRUNCATE 0x400
#define VN_ZERO 0x800
int nvndisks;
int all = 0;
int verbose = 0;
int global = 0;
u_long setopt = 0;
u_long resetopt = 0;
char *configfile;
int config __P((struct vndisk *));
void getoptions __P((struct vndisk *, char *));
char *rawdevice __P((char *));
void readconfig __P((int));
static void usage __P((void));
static int getsize(const char *arg);
static void do_autolabel(const char *dev, const char *label);
int what_opt __P((char *, u_long *));
int
main(argc, argv)
char **argv;
{
register int i, rv;
int flags = 0;
int size = 0;
char *autolabel = NULL;
char *s;
configfile = _PATH_VNTAB;
while ((i = getopt(argc, argv, "acdef:gr:s:S:TZL:uv")) != -1)
switch (i) {
/* all -- use config file */
case 'a':
all++;
break;
/* configure */
case 'c':
flags |= VN_CONFIG;
flags &= ~VN_UNCONFIG;
break;
/* disable */
case 'd':
flags |= VN_DISABLE;
flags &= ~VN_ENABLE;
break;
/* enable */
case 'e':
flags |= (VN_ENABLE|VN_CONFIG);
flags &= ~(VN_DISABLE|VN_UNCONFIG);
break;
/* alternate config file */
case 'f':
configfile = optarg;
break;
/* fiddle global options */
case 'g':
global = 1 - global;
break;
/* reset options */
case 'r':
for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
if (what_opt(s, &resetopt))
errx(1, "invalid options '%s'", s);
}
flags |= VN_RESET;
break;
/* set options */
case 's':
for (s = strtok(optarg, ","); s; s = strtok(NULL, ",")) {
if (what_opt(s, &setopt))
errx(1, "invalid options '%s'", s);
}
flags |= VN_SET;
break;
/* unconfigure */
case 'u':
flags |= (VN_DISABLE|VN_UNCONFIG);
flags &= ~(VN_ENABLE|VN_CONFIG);
break;
/* verbose */
case 'v':
verbose++;
break;
case 'S':
size = getsize(optarg);
break;
case 'T':
flags |= VN_TRUNCATE;
break;
case 'Z':
flags |= VN_ZERO;
break;
case 'L':
autolabel = optarg;
break;
default:
usage();
}
if (modfind("vn") < 0)
if (kldload("vn") < 0 || modfind("vn") < 0)
warnx( "cannot find or load \"vn\" kernel module");
if (flags == 0)
flags = VN_CONFIG;
if (all) {
readconfig(flags);
} else {
if (argc < optind + 1)
usage();
vndisks[0].dev = argv[optind++];
vndisks[0].file = argv[optind++]; /* may be NULL */
vndisks[0].flags = flags;
vndisks[0].size = size;
vndisks[0].autolabel = autolabel;
if (optind < argc)
getoptions(&vndisks[0], argv[optind]);
nvndisks = 1;
}
rv = 0;
for (i = 0; i < nvndisks; i++)
rv += config(&vndisks[i]);
exit(rv);
}
int
what_opt(str,p)
char *str;
u_long *p;
{
if (!strcmp(str,"reserve")) { *p |= VN_RESERVE; return 0; }
if (!strcmp(str,"labels")) { *p |= VN_LABELS; return 0; }
if (!strcmp(str,"follow")) { *p |= VN_FOLLOW; return 0; }
if (!strcmp(str,"debug")) { *p |= VN_DEBUG; return 0; }
if (!strcmp(str,"io")) { *p |= VN_IO; return 0; }
if (!strcmp(str,"all")) { *p |= ~0; return 0; }
if (!strcmp(str,"none")) { *p |= 0; return 0; }
return 1;
}
int
config(vnp)
struct vndisk *vnp;
{
char *dev, *file, *oarg;
int flags;
struct vn_ioctl vnio;
register int rv;
char *rdev;
FILE *f;
u_long l;
int pgsize = getpagesize();
rv = 0;
/*
* Prepend "/dev/" to the specified device name, if necessary.
* Operate on vnp->dev because it is used later.
*/
if (vnp->dev[0] != '/' && vnp->dev[0] != '.')
(void)asprintf(&vnp->dev, "/dev/%s", vnp->dev);
dev = vnp->dev;
file = vnp->file;
flags = vnp->flags;
oarg = vnp->oarg;
if (flags & VN_IGNORE)
return(0);
/*
* When a regular file has been specified, do any requested setup
* of the file. Truncation (also creates the file if necessary),
* sizing, and zeroing.
*/
if (file && vnp->size != 0 && (flags & VN_CONFIG)) {
int fd;
struct stat st;
if (flags & VN_TRUNCATE)
fd = open(file, O_RDWR|O_CREAT|O_TRUNC);
else
fd = open(file, O_RDWR);
if (fd >= 0 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
if (st.st_size < (off_t)vnp->size * pgsize)
ftruncate(fd, (off_t)vnp->size * pgsize);
if (vnp->size != 0)
st.st_size = (off_t)vnp->size * pgsize;
if (flags & VN_ZERO) {
char *buf = malloc(ZBUFSIZE);
bzero(buf, ZBUFSIZE);
while (st.st_size > 0) {
int n = (st.st_size > ZBUFSIZE) ?
ZBUFSIZE : (int)st.st_size;
if (write(fd, buf, n) != n) {
ftruncate(fd, 0);
printf("Unable to ZERO file %s\n", file);
return(0);
}
st.st_size -= (off_t)n;
}
}
close(fd);
} else {
printf("Unable to open file %s\n", file);
return(0);
}
}
rdev = rawdevice(dev);
f = fopen(rdev, "rw");
if (f == NULL) {
warn("%s", dev);
return(1);
}
vnio.vn_file = file;
vnio.vn_size = vnp->size; /* non-zero only if swap backed */
/*
* Disable the device
*/
if (flags & VN_DISABLE) {
if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
rv = unmount(oarg, 0);
if (rv) {
if (errno == EBUSY)
flags &= ~VN_UNCONFIG;
if ((flags & VN_UNCONFIG) == 0)
warn("umount");
} else if (verbose)
printf("%s: unmounted\n", dev);
}
}
/*
* Clear (un-configure) the device
*/
if (flags & VN_UNCONFIG) {
rv = ioctl(fileno(f), VNIOCDETACH, &vnio);
if (rv) {
if (errno == ENODEV) {
if (verbose)
printf("%s: not configured\n", dev);
rv = 0;
} else
warn("VNIOCDETACH");
} else if (verbose)
printf("%s: cleared\n", dev);
}
/*
* Set specified options
*/
if (flags & VN_SET) {
l = setopt;
if (global)
rv = ioctl(fileno(f), VNIOCGSET, &l);
else
rv = ioctl(fileno(f), VNIOCUSET, &l);
if (rv) {
warn("VNIO[GU]SET");
} else if (verbose)
printf("%s: flags now=%08x\n",dev,l);
}
/*
* Reset specified options
*/
if (flags & VN_RESET) {
l = resetopt;
if (global)
rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
else
rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
if (rv) {
warn("VNIO[GU]CLEAR");
} else if (verbose)
printf("%s: flags now=%08x\n",dev,l);
}
/*
* Configure the device
*/
if (flags & VN_CONFIG) {
rv = ioctl(fileno(f), VNIOCATTACH, &vnio);
if (rv) {
warn("VNIOCATTACH");
flags &= ~VN_ENABLE;
} else {
if (verbose) {
printf(
"%s: %d bytes on %s\n",
dev, vnio.vn_size, file
);
}
/*
* autolabel
*/
if (vnp->autolabel) {
do_autolabel(vnp->dev, vnp->autolabel);
}
}
}
/*
* Set an option
*/
if (flags & VN_SET) {
l = setopt;
if (global)
rv = ioctl(fileno(f), VNIOCGSET, &l);
else
rv = ioctl(fileno(f), VNIOCUSET, &l);
if (rv) {
warn("VNIO[GU]SET");
} else if (verbose)
printf("%s: flags now=%08lx\n",dev,l);
}
/*
* Reset an option
*/
if (flags & VN_RESET) {
l = resetopt;
if (global)
rv = ioctl(fileno(f), VNIOCGCLEAR, &l);
else
rv = ioctl(fileno(f), VNIOCUCLEAR, &l);
if (rv) {
warn("VNIO[GU]CLEAR");
} else if (verbose)
printf("%s: flags now=%08lx\n",dev,l);
}
/*
* Enable special functions on the device
*/
if (flags & VN_ENABLE) {
if (flags & VN_SWAP) {
rv = swapon(dev);
if (rv)
warn("swapon");
else if (verbose)
printf("%s: swapping enabled\n", dev);
}
if (flags & (VN_MOUNTRO|VN_MOUNTRW)) {
struct ufs_args args;
int mflags;
args.fspec = dev;
mflags = (flags & VN_MOUNTRO) ? MNT_RDONLY : 0;
rv = mount("ufs", oarg, mflags, &args);
if (rv)
warn("mount");
else if (verbose)
printf("%s: mounted on %s\n", dev, oarg);
}
}
/* done: */
fclose(f);
fflush(stdout);
return(rv < 0);
}
#define EOL(c) ((c) == '\0' || (c) == '\n')
#define WHITE(c) ((c) == ' ' || (c) == '\t' || (c) == '\n')
void
readconfig(flags)
int flags;
{
char buf[LINESIZE];
FILE *f;
register char *cp, *sp;
register int ix;
f = fopen(configfile, "r");
if (f == NULL)
err(1, "%s", configfile);
ix = 0;
while (fgets(buf, LINESIZE, f) != NULL) {
cp = buf;
if (*cp == '#')
continue;
while (!EOL(*cp) && WHITE(*cp))
cp++;
if (EOL(*cp))
continue;
sp = cp;
while (!EOL(*cp) && !WHITE(*cp))
cp++;
if (EOL(*cp))
continue;
*cp++ = '\0';
vndisks[ix].dev = malloc(cp - sp);
strcpy(vndisks[ix].dev, sp);
while (!EOL(*cp) && WHITE(*cp))
cp++;
if (EOL(*cp))
continue;
sp = cp;
while (!EOL(*cp) && !WHITE(*cp))
cp++;
*cp++ = '\0';
if (*sp == '%' && strtol(sp + 1, NULL, 0) > 0) {
vndisks[ix].size = getsize(sp + 1);
} else {
vndisks[ix].file = malloc(cp - sp);
strcpy(vndisks[ix].file, sp);
}
while (!EOL(*cp) && WHITE(*cp))
cp++;
vndisks[ix].flags = flags;
if (!EOL(*cp)) {
sp = cp;
while (!EOL(*cp) && !WHITE(*cp))
cp++;
*cp++ = '\0';
getoptions(&vndisks[ix], sp);
}
nvndisks++;
ix++;
}
}
void
getoptions(vnp, fstr)
struct vndisk *vnp;
char *fstr;
{
int flags = 0;
char *oarg = NULL;
if (strcmp(fstr, "swap") == 0)
flags |= VN_SWAP;
else if (strncmp(fstr, "mount=", 6) == 0) {
flags |= VN_MOUNTRW;
oarg = &fstr[6];
} else if (strncmp(fstr, "mountrw=", 8) == 0) {
flags |= VN_MOUNTRW;
oarg = &fstr[8];
} else if (strncmp(fstr, "mountro=", 8) == 0) {
flags |= VN_MOUNTRO;
oarg = &fstr[8];
} else if (strcmp(fstr, "ignore") == 0)
flags |= VN_IGNORE;
vnp->flags |= flags;
if (oarg) {
vnp->oarg = malloc(strlen(oarg) + 1);
strcpy(vnp->oarg, oarg);
} else
vnp->oarg = NULL;
}
char *
rawdevice(dev)
char *dev;
{
register char *rawbuf, *dp, *ep;
struct stat sb;
int len;
len = strlen(dev);
rawbuf = malloc(len + 2);
strcpy(rawbuf, dev);
if (stat(rawbuf, &sb) != 0 || !S_ISCHR(sb.st_mode)) {
dp = rindex(rawbuf, '/');
if (dp) {
for (ep = &rawbuf[len]; ep > dp; --ep)
*(ep+1) = *ep;
*++ep = 'r';
}
}
return (rawbuf);
}
static void
usage()
{
fprintf(stderr, "%s\n%s\n%s\n",
"usage: vnconfig [-cdeguv] [-s option] [-r option] [-S value] special_file",
" [regular_file] [feature]",
" vnconfig -a [-cdeguv] [-s option] [-r option] [-f config_file]");
exit(1);
}
static int
getsize(const char *arg)
{
char *ptr;
int pgsize = getpagesize();
quad_t size = strtoq(arg, &ptr, 0);
switch(tolower(*ptr)) {
case 't':
/*
* GULP! Terrabytes. It's actually possible to create
* a 7.9 TB VN device, though newfs can't handle any single
* filesystem larger then 1 TB.
*/
size *= 1024;
/* fall through */
case 'g':
size *= 1024;
/* fall through */
default:
case 'm':
size *= 1024;
/* fall through */
case 'k':
size *= 1024;
/* fall through */
case 'c':
break;
}
size = (size + pgsize - 1) / pgsize;
return((int)size);
}
/*
* DO_AUTOLABEL
*
* Automatically label the device. This will wipe any preexisting
* label.
*/
static void
do_autolabel(const char *dev, const char *label)
{
/* XXX not yet implemented */
fprintf(stderr, "autolabel not yet implemented, sorry\n");
exit(1);
}
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