509798ea65
This is based on DragonFly's implementation from about 2019-09-13. It only contains the basic code and header information to identify the disks. Relnotes: yes Differential Revision: https://reviews.freebsd.org/D13369
153 lines
4.1 KiB
C
153 lines
4.1 KiB
C
/*-
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* Copyright (c) 2017-2019 The DragonFly Project
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <err.h>
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#include <sys/types.h>
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#include "hammer2_disk.h"
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#include "fstyp.h"
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static hammer2_volume_data_t*
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__read_voldata(FILE *fp)
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{
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hammer2_volume_data_t *voldata;
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voldata = read_buf(fp, 0, sizeof(*voldata));
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if (voldata == NULL)
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err(1, "failed to read volume data");
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return (voldata);
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}
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static int
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__test_voldata(const hammer2_volume_data_t *voldata)
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{
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if (voldata->magic != HAMMER2_VOLUME_ID_HBO &&
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voldata->magic != HAMMER2_VOLUME_ID_ABO)
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return (1);
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return (0);
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}
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static int
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__read_label(FILE *fp, char *label, size_t size)
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{
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hammer2_blockref_t broot, best, *bref;
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hammer2_media_data_t *vols[HAMMER2_NUM_VOLHDRS], *media;
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hammer2_off_t io_off, io_base;
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size_t bytes, io_bytes, boff;
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int i, best_i, error = 0;
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best_i = -1;
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memset(&best, 0, sizeof(best));
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for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++) {
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memset(&broot, 0, sizeof(broot));
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broot.type = HAMMER2_BREF_TYPE_VOLUME;
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broot.data_off = (i * HAMMER2_ZONE_BYTES64) | HAMMER2_PBUFRADIX;
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vols[i] = read_buf(fp, broot.data_off & ~HAMMER2_OFF_MASK_RADIX,
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sizeof(*vols[i]));
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broot.mirror_tid = vols[i]->voldata.mirror_tid;
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if (best_i < 0 || best.mirror_tid < broot.mirror_tid) {
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best_i = i;
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best = broot;
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}
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}
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if (best_i == -1) {
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warnx("Failed to find volume header from zones");
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error = 1;
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goto done;
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}
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bref = &vols[best_i]->voldata.sroot_blockset.blockref[0];
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if (bref->type != HAMMER2_BREF_TYPE_INODE) {
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warnx("Superroot blockref type is not inode");
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error = 2;
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goto done;
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}
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bytes = bref->data_off & HAMMER2_OFF_MASK_RADIX;
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if (bytes)
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bytes = (size_t)1 << bytes;
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if (bytes != sizeof(hammer2_inode_data_t)) {
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warnx("Superroot blockref size does not match inode size");
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error = 3;
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goto done;
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}
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io_off = bref->data_off & ~HAMMER2_OFF_MASK_RADIX;
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io_base = io_off & ~(hammer2_off_t)(HAMMER2_MINIOSIZE - 1);
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boff = io_off - io_base;
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io_bytes = HAMMER2_MINIOSIZE;
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while (io_bytes + boff < bytes)
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io_bytes <<= 1;
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if (io_bytes > sizeof(*media)) {
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warnx("Invalid I/O bytes");
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error = 4;
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goto done;
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}
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media = read_buf(fp, io_base, io_bytes);
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if (boff)
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memcpy(media, (char*)media + boff, bytes);
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strlcpy(label, (char*)media->ipdata.filename, size);
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free(media);
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done:
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for (i = 0; i < HAMMER2_NUM_VOLHDRS; i++)
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free(vols[i]);
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return (error);
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}
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int
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fstyp_hammer2(FILE *fp, char *label, size_t size)
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{
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hammer2_volume_data_t *voldata;
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int error = 1;
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voldata = __read_voldata(fp);
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if (__test_voldata(voldata))
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goto done;
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error = __read_label(fp, label, size);
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done:
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free(voldata);
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return (error);
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}
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