95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/*
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* Copyright (C) 1999 by Andries Brouwer
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* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
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* Copyright (C) 2001 by Andreas Dilger
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*/
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#include <string.h>
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#include "superblocks.h"
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#include "minix.h"
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static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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{
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unsigned char *ext;
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int version;
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/* for more details see magic strings below */
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switch(mag->magic[1]) {
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case '\023':
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version = 1;
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break;
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case '\044':
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version = 2;
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break;
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case '\115':
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version = 3;
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break;
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default:
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return -1;
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break;
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}
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if (version <= 2) {
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struct minix_super_block *sb;
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uint32_t zones;
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sb = blkid_probe_get_sb(pr, mag, struct minix_super_block);
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if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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return -1;
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zones = version == 2 ? sb->s_zones : sb->s_nzones;
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/* sanity checks to be sure that the FS is really minix */
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if (sb->s_imap_blocks * MINIX_BLOCK_SIZE * 8 < sb->s_ninodes + 1)
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return -1;
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if (sb->s_zmap_blocks * MINIX_BLOCK_SIZE * 8 < zones - sb->s_firstdatazone + 1)
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return -1;
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} else if (version == 3) {
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struct minix3_super_block *sb;
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sb = blkid_probe_get_sb(pr, mag, struct minix3_super_block);
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if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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return -1;
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}
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/* unfortunately, some parts of ext3 is sometimes possible to
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* interpreted as minix superblock. So check for extN magic
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* string. (For extN magic string and offsets see ext.c.)
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*/
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ext = blkid_probe_get_buffer(pr, 0x400 + 0x38, 2);
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if (ext && memcmp(ext, "\123\357", 2) == 0)
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return -1;
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blkid_probe_sprintf_version(pr, "%d", version);
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return 0;
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}
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const struct blkid_idinfo minix_idinfo =
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{
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.name = "minix",
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.usage = BLKID_USAGE_FILESYSTEM,
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.probefunc = probe_minix,
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.magics =
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{
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/* version 1 */
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{ .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 2 */
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{ .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 3 */
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{ .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 },
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{ NULL }
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}
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};
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