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/*
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* This is written from sratch according to Linux kernel fs/sysv/super.c file.
* It seems that sysv probing code in libvolume_id and also in the original
* blkid is useless.
*
* This file may be redistributed under the terms of the
* GNU Lesser General Public License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdint.h>
#include <stddef.h>
#include "superblocks.h"
#define XENIX_NICINOD 100
#define XENIX_NICFREE 100
struct xenix_super_block {
uint16_t s_isize;
uint32_t s_fsize;
uint16_t s_nfree;
uint32_t s_free[XENIX_NICFREE];
uint16_t s_ninode;
uint16_t s_inode[XENIX_NICINOD];
uint8_t s_flock;
uint8_t s_ilock;
uint8_t s_fmod;
uint8_t s_ronly;
uint32_t s_time;
uint32_t s_tfree;
uint16_t s_tinode;
uint16_t s_dinfo[4];
uint8_t s_fname[6];
uint8_t s_fpack[6];
uint8_t s_clean;
uint8_t s_fill[371];
uint32_t s_magic;
uint32_t s_type;
} __attribute__((packed));
#define SYSV_NICINOD 100
#define SYSV_NICFREE 50
struct sysv_super_block
{
uint16_t s_isize;
uint16_t s_pad0;
uint32_t s_fsize;
uint16_t s_nfree;
uint16_t s_pad1;
uint32_t s_free[SYSV_NICFREE];
uint16_t s_ninode;
uint16_t s_pad2;
uint16_t s_inode[SYSV_NICINOD];
uint8_t s_flock;
uint8_t s_ilock;
uint8_t s_fmod;
uint8_t s_ronly;
uint32_t s_time;
uint16_t s_dinfo[4];
uint32_t s_tfree;
uint16_t s_tinode;
uint16_t s_pad3;
uint8_t s_fname[6];
uint8_t s_fpack[6];
uint32_t s_fill[12];
uint32_t s_state;
uint32_t s_magic;
uint32_t s_type;
};
static int probe_xenix(blkid_probe pr, const struct blkid_idmag *mag)
{
struct xenix_super_block *sb;
sb = blkid_probe_get_sb(pr, mag, struct xenix_super_block);
if (!sb)
return errno ? -errno : 1;
blkid_probe_set_label(pr, sb->s_fname, sizeof(sb->s_fname));
return 0;
}
#define SYSV_BLOCK_SIZE 1024
/* Note that we don't probe for Coherent FS, this FS does not have
* magic string. (It requires to probe fname/fpack field..)
*/
static int probe_sysv(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
struct sysv_super_block *sb;
int blocks[] = {0, 9, 15, 18};
size_t i;
for (i = 0; i < ARRAY_SIZE(blocks); i++) {
int off = blocks[i] * SYSV_BLOCK_SIZE + SYSV_BLOCK_SIZE/2;
sb = (struct sysv_super_block *)
blkid_probe_get_buffer(pr,
off,
sizeof(struct sysv_super_block));
if (!sb)
return errno ? -errno : 1;
if (sb->s_magic == cpu_to_le32(0xfd187e20) ||
sb->s_magic == cpu_to_be32(0xfd187e20)) {
if (blkid_probe_set_label(pr, sb->s_fname,
sizeof(sb->s_fname)))
return 1;
if (blkid_probe_set_magic(pr,
off + offsetof(struct sysv_super_block,
s_magic),
sizeof(sb->s_magic),
(unsigned char *) &sb->s_magic))
return 1;
return 0;
}
}
return 1;
}
const struct blkid_idinfo xenix_idinfo =
{
.name = "xenix",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_xenix,
.magics =
{
{ .magic = "\x2b\x55\x44", .len = 3, .kboff = 1, .sboff = 0x400 },
{ .magic = "\x44\x55\x2b", .len = 3, .kboff = 1, .sboff = 0x400 },
{ NULL }
}
};
const struct blkid_idinfo sysv_idinfo =
{
.name = "sysv",
.usage = BLKID_USAGE_FILESYSTEM,
.probefunc = probe_sysv,
/* SYSV is BE and LE and superblock could be on four positions. It's
* simpler to probe for the magic string by .probefunc().
*/
.magics = BLKID_NONE_MAGIC
};
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