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/*
* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
*
* Inspired by libvolume_id by
* Kay Sievers <kay.sievers@vrfy.org>
*
* 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 <string.h>
#include <stdint.h>
#include "superblocks.h"
#define JM_SIGNATURE "JM"
#define JM_MINOR_VERSION(_x) ((_x)->version & 0xFF)
#define JM_MAJOR_VERSION(_x) ((_x)->version >> 8)
#define JM_SPARES 2
#define JM_MEMBERS 8
struct jm_metadata {
int8_t signature[2]; /* 0x0 - 0x01 */
uint16_t version; /* 0x03 - 0x04 JMicron version */
uint16_t checksum; /* 0x04 - 0x05 */
uint8_t filler[10];
uint32_t identity; /* 0x10 - 0x13 */
struct {
uint32_t base; /* 0x14 - 0x17 */
uint32_t range; /* 0x18 - 0x1B range */
uint16_t range2; /* 0x1C - 0x1D range2 */
} segment;
int8_t name[16]; /* 0x20 - 0x2F */
uint8_t mode; /* 0x30 RAID level */
uint8_t block; /* 0x31 stride size (2=4K, 3=8K, ...) */
uint16_t attribute; /* 0x32 - 0x33 */
uint8_t filler1[4];
uint32_t spare[JM_SPARES]; /* 0x38 - 0x3F */
uint32_t member[JM_MEMBERS]; /* 0x40 - 0x5F */
uint8_t filler2[0x20];
} __attribute__ ((packed));
static void jm_to_cpu(struct jm_metadata *jm)
{
unsigned int i;
jm->version = le16_to_cpu(jm->version);
jm->checksum = le16_to_cpu(jm->checksum);
jm->identity = le32_to_cpu(jm->identity);
jm->segment.base = le32_to_cpu(jm->segment.base);
jm->segment.range = le32_to_cpu(jm->segment.range);
jm->segment.range2 = le16_to_cpu(jm->segment.range2);
jm->attribute = le16_to_cpu(jm->attribute);
for (i = 0; i < JM_SPARES; i++)
jm->spare[i] = le32_to_cpu(jm->spare[i]);
for (i = 0; i < JM_MEMBERS; i++)
jm->member[i] = le32_to_cpu(jm->member[i]);
}
static int jm_checksum(const struct jm_metadata *jm)
{
size_t count = sizeof(*jm) / sizeof(uint16_t);
uint16_t sum = 0;
unsigned char *ptr = (unsigned char *) jm;
while (count--) {
uint16_t val;
memcpy(&val, ptr, sizeof(uint16_t));
sum += le16_to_cpu(val);
ptr += sizeof(uint16_t);
}
return sum == 0 || sum == 1;
}
static int probe_jmraid(blkid_probe pr,
const struct blkid_idmag *mag __attribute__((__unused__)))
{
uint64_t off;
struct jm_metadata *jm;
if (pr->size < 0x10000)
return 1;
if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
return 1;
off = ((pr->size / 0x200) - 1) * 0x200;
jm = (struct jm_metadata *)
blkid_probe_get_buffer(pr,
off,
sizeof(struct jm_metadata));
if (!jm)
return errno ? -errno : 1;
if (memcmp(jm->signature, JM_SIGNATURE, sizeof(JM_SIGNATURE) - 1) != 0)
return 1;
if (!jm_checksum(jm))
return 1;
jm_to_cpu(jm);
if (jm->mode > 5)
return 1;
if (blkid_probe_sprintf_version(pr, "%u.%u",
JM_MAJOR_VERSION(jm), JM_MINOR_VERSION(jm)) != 0)
return 1;
if (blkid_probe_set_magic(pr, off, sizeof(jm->signature),
(unsigned char *) jm->signature))
return 1;
return 0;
}
const struct blkid_idinfo jmraid_idinfo = {
.name = "jmicron_raid_member",
.usage = BLKID_USAGE_RAID,
.probefunc = probe_jmraid,
.magics = BLKID_NONE_MAGIC
};
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