/*-
* Copyright (c) 2017-2019 The DragonFly Project
* Copyright (c) 2017-2019 Tomohiro Kusumi <tkusumi@netbsd.org>
* All rights reserved.
*
* This software was developed by Edward Tomasz Napierala under sponsorship
* from the FreeBSD Foundation.
*
* 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>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <err.h>
#include <assert.h>
#include <sys/types.h>
#include "hammer2_disk.h"
#include "fstyp.h"
static hammer2_volume_data_t*
read_voldata(FILE *fp)
{
hammer2_volume_data_t *voldata;
voldata = read_buf(fp, 0, sizeof(*voldata));
if (voldata == NULL)
err(1, "failed to read volume data");
return (voldata);
}
static int
test_voldata(const hammer2_volume_data_t *voldata)
{
if (voldata->magic != HAMMER2_VOLUME_ID_HBO &&
voldata->magic != HAMMER2_VOLUME_ID_ABO)
return (1);
return (0);
}
static hammer2_media_data_t*
read_media(FILE *fp, const hammer2_blockref_t *bref, size_t *media_bytes)
{
hammer2_media_data_t *media;
hammer2_off_t io_off, io_base;
size_t bytes, io_bytes, boff;
bytes = (bref->data_off & HAMMER2_OFF_MASK_RADIX);
if (bytes)
bytes = (size_t)1 << bytes;
*media_bytes = bytes;
if (!bytes) {
warnx("blockref has no data");
return (NULL);
}
io_off = bref->data_off & ~HAMMER2_OFF_MASK_RADIX;
io_base = io_off & ~(hammer2_off_t)(HAMMER2_MINIOSIZE - 1);
boff = io_off - io_base;
io_bytes = HAMMER2_MINIOSIZE;
while (io_bytes + boff < bytes)
io_bytes <<= 1;
if (io_bytes > sizeof(hammer2_media_data_t)) {
warnx("invalid I/O bytes");
return (NULL);
}
if (fseek(fp, io_base, SEEK_SET) == -1) {
warnx("failed to seek media");
return (NULL);
}
media = read_buf(fp, io_base, io_bytes);
if (media == NULL) {
warnx("failed to read media");
return (NULL);
}
if (boff)
memcpy(media, (char *)media + boff, bytes);
return (media);
}
static int
find_pfs(FILE *fp, const hammer2_blockref_t *bref, const char *pfs, bool *res)
{
hammer2_media_data_t *media;
hammer2_inode_data_t ipdata;
hammer2_blockref_t *bscan;
size_t bytes;
int i, bcount;
media = read_media(fp, bref, &bytes);
if (media == NULL)
return (-1);
switch (bref->type) {
case HAMMER2_BREF_TYPE_INODE:
ipdata = media->ipdata;
if (ipdata.meta.pfs_type == HAMMER2_PFSTYPE_SUPROOT) {
bscan = &ipdata.u.blockset.blockref[0];
bcount = HAMMER2_SET_COUNT;
} else {
bscan = NULL;
bcount = 0;
if (ipdata.meta.op_flags & HAMMER2_OPFLAG_PFSROOT) {
if (memchr(ipdata.filename, 0,
sizeof(ipdata.filename))) {
if (!strcmp(
(const char*)ipdata.filename, pfs))
*res = true;
} else {
if (strlen(pfs) > 0 &&
!memcmp(ipdata.filename, pfs,
strlen(pfs)))
*res = true;
}
} else
assert(0);
}
break;
case HAMMER2_BREF_TYPE_INDIRECT:
bscan = &media->npdata[0];
bcount = bytes / sizeof(hammer2_blockref_t);
break;
default:
bscan = NULL;
bcount = 0;
break;
}
for (i = 0; i < bcount; ++i) {
if (bscan[i].type != HAMMER2_BREF_TYPE_EMPTY) {
if (find_pfs(fp, &bscan[i], pfs, res) == -1) {
free(media);
return (-1);
}
}
}
free(media);
return (0);
}
static char*
extract_device_name(const char *devpath)
{
char *p, *head;
if (!devpath)
return NULL;
p = strdup(devpath);
head = p;
p = strchr(p, '@');
if (p)
*p = 0;
p = strrchr(head, '/');
if (p) {
p++;
if (*p == 0) {
free(head);
return NULL;
}
p = strdup(p);
free(head);
return p;
}
return head;
}
static int
read_label(FILE *fp, char *label, size_t size)
{
hammer2_blockref_t broot, best, *bref;
hammer2_media_data_t *vols[HAMMER2_NUM_VOLHDRS], *media;
size_t bytes;
bool res = false;
int i, best_i, error = 1;
const char *pfs;
char *devname;
best_i = -1;
memset(&best, 0, sizeof(best));
for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
memset(&broot, 0, sizeof(broot));
broot.type = HAMMER2_BREF_TYPE_VOLUME;
broot.data_off = (i * HAMMER2_ZONE_BYTES64) | HAMMER2_PBUFRADIX;
vols[i] = read_buf(fp, broot.data_off & ~HAMMER2_OFF_MASK_RADIX,
sizeof(*vols[i]));
broot.mirror_tid = vols[i]->voldata.mirror_tid;
if (best_i < 0 || best.mirror_tid < broot.mirror_tid) {
best_i = i;
best = broot;
}
}
bref = &vols[best_i]->voldata.sroot_blockset.blockref[0];
if (bref->type != HAMMER2_BREF_TYPE_INODE) {
warnx("blockref type is not inode");
goto fail;
}
media = read_media(fp, bref, &bytes);
if (media == NULL) {
goto fail;
}
pfs = "";
devname = extract_device_name(NULL);
assert(!devname); /* Currently always NULL in FreeBSD. */
/* Add device name to help support multiple autofs -media mounts. */
if (find_pfs(fp, bref, pfs, &res) == 0 && res) {
if (devname)
snprintf(label, size, "%s_%s", pfs, devname);
else
strlcpy(label, pfs, size);
} else {
memset(label, 0, size);
memcpy(label, media->ipdata.filename,
sizeof(media->ipdata.filename));
if (devname) {
strlcat(label, "_", size);
strlcat(label, devname, size);
}
}
if (devname)
free(devname);
free(media);
error = 0;
fail:
for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++)
free(vols[i]);
return (error);
}
int
fstyp_hammer2(FILE *fp, char *label, size_t size)
{
hammer2_volume_data_t *voldata;
int error = 1;
voldata = read_voldata(fp);
if (test_voldata(voldata))
goto fail;
error = read_label(fp, label, size);
fail:
free(voldata);
return (error);
}
