NetBSD/usr.sbin/fstyp/hammer.c

224 lines
5.5 KiB
C

/* $NetBSD: hammer.c,v 1.3 2020/01/15 15:30:46 tkusumi Exp $ */
/*-
* Copyright (c) 2016-2019 The DragonFly Project
* Copyright (c) 2016-2019 Tomohiro Kusumi <tkusumi@netbsd.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hammer.c,v 1.3 2020/01/15 15:30:46 tkusumi Exp $");
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>
#include <assert.h>
#include "fstyp.h"
#include "hammer_disk.h"
static hammer_volume_ondisk_t
read_ondisk(FILE *fp)
{
hammer_volume_ondisk_t ondisk;
ondisk = read_buf(fp, 0, sizeof(*ondisk));
if (ondisk == NULL)
err(1, "failed to read ondisk");
return (ondisk);
}
static int
test_ondisk(const hammer_volume_ondisk_t ondisk)
{
static int count = 0;
static hammer_uuid_t fsid, fstype;
static char label[64];
if (ondisk->vol_signature != HAMMER_FSBUF_VOLUME &&
ondisk->vol_signature != HAMMER_FSBUF_VOLUME_REV)
return (1);
if (ondisk->vol_rootvol != HAMMER_ROOT_VOLNO)
return (2);
if (ondisk->vol_no < 0 || ondisk->vol_no > HAMMER_MAX_VOLUMES - 1)
return (3);
if (ondisk->vol_count < 1 || ondisk->vol_count > HAMMER_MAX_VOLUMES)
return (4);
if (count == 0) {
count = ondisk->vol_count;
assert(count != 0);
memcpy(&fsid, &ondisk->vol_fsid, sizeof(fsid));
memcpy(&fstype, &ondisk->vol_fstype, sizeof(fstype));
strlcpy(label, ondisk->vol_label, sizeof(label));
} else {
if (ondisk->vol_count != count)
return (5);
if (memcmp(&ondisk->vol_fsid, &fsid, sizeof(fsid)))
return (6);
if (memcmp(&ondisk->vol_fstype, &fstype, sizeof(fstype)))
return (7);
if (strcmp(ondisk->vol_label, label))
return (8);
}
return (0);
}
int
fstyp_hammer(FILE *fp, char *label, size_t size)
{
hammer_volume_ondisk_t ondisk;
int error = 1;
#ifdef HAS_DEVPATH
const char *p;
#endif
ondisk = read_ondisk(fp);
if (ondisk->vol_no != HAMMER_ROOT_VOLNO)
goto fail;
if (ondisk->vol_count != 1)
goto fail;
if (test_ondisk(ondisk))
goto fail;
/*
* fstyp_function in DragonFly takes an additional devpath argument
* which doesn't exist in FreeBSD and NetBSD.
*/
#ifdef HAS_DEVPATH
/* Add device name to help support multiple autofs -media mounts. */
p = strrchr(devpath, '/');
if (p) {
p++;
if (*p == 0)
strlcpy(label, ondisk->vol_label, size);
else
snprintf(label, size, "%s_%s", ondisk->vol_label, p);
} else
snprintf(label, size, "%s_%s", ondisk->vol_label, devpath);
#else
strlcpy(label, ondisk->vol_label, size);
#endif
error = 0;
fail:
free(ondisk);
return (error);
}
static int
test_volume(const char *volpath)
{
hammer_volume_ondisk_t ondisk;
FILE *fp;
int volno = -1;
if ((fp = fopen(volpath, "r")) == NULL)
err(1, "failed to open %s", volpath);
ondisk = read_ondisk(fp);
fclose(fp);
if (test_ondisk(ondisk))
goto fail;
volno = ondisk->vol_no;
fail:
free(ondisk);
return (volno);
}
static int
__fsvtyp_hammer(const char *blkdevs, char *label, size_t size, int partial)
{
hammer_volume_ondisk_t ondisk = NULL;
FILE *fp;
char *dup, *p, *volpath, x[HAMMER_MAX_VOLUMES];
int i, volno, error = 1;
if (!blkdevs)
goto fail;
memset(x, 0, sizeof(x));
dup = strdup(blkdevs);
p = dup;
volpath = NULL;
volno = -1;
while (p) {
volpath = p;
if ((p = strchr(p, ':')) != NULL)
*p++ = '\0';
if ((volno = test_volume(volpath)) == -1)
break;
assert(volno >= 0);
assert(volno < HAMMER_MAX_VOLUMES);
x[volno]++;
}
if (!volpath)
err(1, "invalid path %s", blkdevs);
if ((fp = fopen(volpath, "r")) == NULL)
err(1, "failed to open %s", volpath);
ondisk = read_ondisk(fp);
fclose(fp);
free(dup);
if (volno == -1)
goto fail;
if (partial)
goto success;
for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
if (x[i] > 1)
goto fail;
for (i = 0; i < HAMMER_MAX_VOLUMES; i++)
if (x[i] == 0)
break;
if (ondisk->vol_count != i)
goto fail;
for (; i < HAMMER_MAX_VOLUMES; i++)
if (x[i] != 0)
goto fail;
success:
/* XXX autofs -media mount can't handle multiple mounts */
strlcpy(label, ondisk->vol_label, size);
error = 0;
fail:
free(ondisk);
return (error);
}
int
fsvtyp_hammer(const char *blkdevs, char *label, size_t size)
{
return (__fsvtyp_hammer(blkdevs, label, size, 0));
}
int
fsvtyp_hammer_partial(const char *blkdevs, char *label, size_t size)
{
return (__fsvtyp_hammer(blkdevs, label, size, 1));
}