best_i will always be >= 0, so remove code to test otherwise. Reported by: Coverity CID: 1412244 MFC after: 2 weeks Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D23159
148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 2017-2019 The DragonFly Project
|
|
* 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>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <err.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 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;
|
|
hammer2_off_t io_off, io_base;
|
|
size_t bytes, io_bytes, boff;
|
|
int i, best_i, error = 0;
|
|
|
|
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("Superroot blockref type is not inode");
|
|
error = 2;
|
|
goto done;
|
|
}
|
|
|
|
bytes = bref->data_off & HAMMER2_OFF_MASK_RADIX;
|
|
if (bytes)
|
|
bytes = (size_t)1 << bytes;
|
|
if (bytes != sizeof(hammer2_inode_data_t)) {
|
|
warnx("Superroot blockref size does not match inode size");
|
|
error = 3;
|
|
goto done;
|
|
}
|
|
|
|
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(*media)) {
|
|
warnx("Invalid I/O bytes");
|
|
error = 4;
|
|
goto done;
|
|
}
|
|
|
|
media = read_buf(fp, io_base, io_bytes);
|
|
if (boff)
|
|
memcpy(media, (char*)media + boff, bytes);
|
|
|
|
strlcpy(label, (char*)media->ipdata.filename, size);
|
|
free(media);
|
|
done:
|
|
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 done;
|
|
|
|
error = __read_label(fp, label, size);
|
|
done:
|
|
free(voldata);
|
|
return (error);
|
|
}
|