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/*
pdc: Promise Fake Raid reader
Copyright (C) 2001
*/
#include <unistd.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/hdreg.h>
#ifdef DIET
#include <sys/mount.h>
#else
#include <linux/fs.h>
#endif
#include <string.h>
#ifdef DIET
typedef char char16_t;
typedef unsigned char u_int8_t;
typedef unsigned short u_int16_t;
typedef uint32_t u_int32_t;
#else
typedef unsigned int uint32_t;
#endif
#ifndef BLKSSZGET
#define BLKSSZGET _IO(0x12,104)/* get block device sector size */
#endif
struct promise_raid_conf {
char promise_id[24];
#define PR_MAGIC "Promise Technology, Inc."
int32_t dummy_0;
int32_t magic_0;
int32_t dummy_1;
int32_t magic_1;
int16_t dummy_2;
int8_t filler1[470];
struct {
int32_t flags; /* 0x200 */
#define PR_F_CONFED 0x00000080
int8_t dummy_0;
int8_t disk_number;
int8_t channel;
int8_t device;
int32_t magic_0;
int32_t dummy_1;
int32_t dummy_2; /* 0x210 */
int32_t disk_secs;
int32_t dummy_3;
int16_t dummy_4;
int8_t status;
#define PR_S_DEFINED 0x01
#define PR_S_ONLINE 0x02
#define PR_S_OFFLINE 0x10
int8_t type;
#define PR_T_STRIPE 0x00
#define PR_T_MIRROR 0x01
#define PR_T_STRIPE_MIRROR 0x04
#define PR_T_SPAN 0x08
u_int8_t total_disks; /* 0x220 */
u_int8_t raid0_shift;
u_int8_t raid0_disks;
u_int8_t array_number;
u_int32_t total_secs;
u_int16_t cylinders;
u_int8_t heads;
u_int8_t sectors;
int32_t magic_1;
int32_t dummy_5; /* 0x230 */
struct {
int16_t dummy_0;
int8_t channel;
int8_t device;
int32_t magic_0;
int32_t disk_number;
} disk[8];
} raid;
int32_t filler2[346];
uint32_t checksum;
};
static unsigned long long calc_pdcblock_offset (int fd) {
unsigned long lba = 0;
struct hd_big_geometry g;
long sectors;
int sector_size = 1;
if (ioctl(fd, HDIO_GETGEO_BIG_RAW, &g))
return -1;
if (ioctl(fd, BLKGETSIZE, §ors))
return -1;
if (ioctl(fd, BLKSSZGET, §or_size))
return -1;
if (!sector_size || !sectors || !g.cylinders || !g.heads || !g.sectors)
return -1;
sector_size /= 512;
g.cylinders = (sectors / (g.heads * g.sectors)) / sector_size;
lba = g.cylinders * (g.heads*g.sectors);
lba = lba - g.sectors;
return lba;
}
static int read_disk_sb (int fd, unsigned char *buffer,int bufsize)
{
int ret = -1;
unsigned long long sb_offset;
/*
* Calculate the position of the superblock,
* it's at first sector of the last cylinder
*/
sb_offset = calc_pdcblock_offset(fd);
if (sb_offset == ((unsigned long long) -1))
return -1;
lseek64(fd, sb_offset * 512, SEEK_SET);
read (fd, buffer, bufsize);
ret = 0;
return ret;
}
static unsigned int calc_sb_csum (unsigned int* ptr)
{
unsigned int sum;
int count;
sum = 0;
for (count=0;count<511;count++)
sum += *ptr++;
return sum;
}
int pdc_dev_running_raid(int fd)
{
struct promise_raid_conf *prom;
unsigned char block[4096];
if (read_disk_sb(fd,(unsigned char*)&block,sizeof(block)))
return -1;
prom = (struct promise_raid_conf*)&block[0];
if (!strcmp(prom->promise_id, "Promise Technology, Inc.") &&
(prom->checksum == calc_sb_csum((unsigned int*)prom)))
return 1;
return 0;
}
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