diff options
Diffstat (limited to 'libblkid/minix1.c')
| -rw-r--r-- | libblkid/minix1.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/libblkid/minix1.c b/libblkid/minix1.c new file mode 100644 index 000000000..54e71396b --- /dev/null +++ b/libblkid/minix1.c @@ -0,0 +1,94 @@ +/* + * Copyright (C) 1999 by Andries Brouwer + * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o + * Copyright (C) 2001 by Andreas Dilger + * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> + * Copyright (C) 2008 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + */ + +#include <string.h> +#include "superblocks.h" +#include "minix.h" + +static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag) +{ + unsigned char *ext; + int version; + + /* for more details see magic strings below */ + switch(mag->magic[1]) { + case '\023': + version = 1; + break; + case '\044': + version = 2; + break; + case '\115': + version = 3; + break; + default: + return -1; + break; + } + + if (version <= 2) { + struct minix_super_block *sb; + uint32_t zones; + + sb = blkid_probe_get_sb(pr, mag, struct minix_super_block); + if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0) + return -1; + + zones = version == 2 ? sb->s_zones : sb->s_nzones; + + /* sanity checks to be sure that the FS is really minix */ + if (sb->s_imap_blocks * MINIX_BLOCK_SIZE * 8 < sb->s_ninodes + 1) + return -1; + if (sb->s_zmap_blocks * MINIX_BLOCK_SIZE * 8 < zones - sb->s_firstdatazone + 1) + return -1; + + } else if (version == 3) { + struct minix3_super_block *sb; + + sb = blkid_probe_get_sb(pr, mag, struct minix3_super_block); + if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0) + return -1; + + } + + /* unfortunately, some parts of ext3 is sometimes possible to + * interpreted as minix superblock. So check for extN magic + * string. (For extN magic string and offsets see ext.c.) + */ + ext = blkid_probe_get_buffer(pr, 0x400 + 0x38, 2); + if (ext && memcmp(ext, "\123\357", 2) == 0) + return -1; + + blkid_probe_sprintf_version(pr, "%d", version); + return 0; +} + +const struct blkid_idinfo minix_idinfo = +{ + .name = "minix", + .usage = BLKID_USAGE_FILESYSTEM, + .probefunc = probe_minix, + .magics = + { + /* version 1 */ + { .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 }, + { .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 }, + + /* version 2 */ + { .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 }, + { .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 }, + + /* version 3 */ + { .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 }, + { NULL } + } +}; + |