71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* volume_id - reads filesystem label and uuid
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include "libvolume_id.h"
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#include "libvolume_id-private.h"
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struct jfs_super_block {
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uint8_t magic[4];
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uint32_t version;
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uint64_t size;
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uint32_t bsize;
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uint32_t dummy1;
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uint32_t pbsize;
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uint32_t dummy2[27];
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uint8_t uuid[16];
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uint8_t label[16];
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uint8_t loguuid[16];
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} PACKED;
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#define JFS_SUPERBLOCK_OFFSET 0x8000
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int volume_id_probe_jfs(struct volume_id *id, uint64_t off, uint64_t size)
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{
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struct jfs_super_block *js;
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info("probing at offset 0x%llx\n", (unsigned long long) off);
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js = (struct jfs_super_block *) volume_id_get_buffer(id, off + JFS_SUPERBLOCK_OFFSET, 0x200);
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if (js == NULL)
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return -1;
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if (memcmp(js->magic, "JFS1", 4) != 0)
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return -1;
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volume_id_set_label_raw(id, js->label, 16);
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volume_id_set_label_string(id, js->label, 16);
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volume_id_set_uuid(id, js->uuid, 0, UUID_DCE);
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volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
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id->type = "jfs";
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return 0;
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}
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