int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector, int first_part_minor)
{
int i, minor = current_minor = first_part_minor;
struct buffer_head *bh;
struct partition *p;
unsigned char *data;
int mask = (1 << hd->minor_shift) - 1;
int sector_size = sector_partition_scale(dev);
#ifdef CONFIG_BSD_DISKLABEL
/* no bsd disklabel as a default */
kdev_t bsd_kdev = 0;
int bsd_maxpart = BSD_MAXPARTITIONS;
#endif
#ifdef CONFIG_BLK_DEV_IDE
int tested_for_xlate = 0;
read_mbr:
#endif
if (!(bh = bread(dev,0,get_ptable_blocksize(dev)))) {
printk(" unable to read partition table\n");
return -1;
}
data = bh->b_data;
/* In some cases we modify the geometry */
/* of the drive (below), so ensure that */
/* nobody else tries to re-use this data. */
bh->b_state = 0;
#ifdef CONFIG_BLK_DEV_IDE
check_table:
#endif
if (*(unsigned short *) (0x1fe + data) != cpu_to_le16(MSDOS_LABEL_MAGIC)) {
brelse(bh);
return 0;
}
p = (struct partition *) (0x1be + data);
#ifdef CONFIG_BLK_DEV_IDE
if (!tested_for_xlate++) { /* Do this only once per disk */
/*
* Look for various forms of IDE disk geometry translation
*/
extern int ide_xlate_1024(kdev_t, int, const char *);
unsigned int sig = le16_to_cpu(*(unsigned short *)(data + 2));
if (SYS_IND(p) == EZD_PARTITION) {
/*
* The remainder of the disk must be accessed using
* a translated geometry that reduces the number of
* apparent cylinders to less than 1024 if possible.
*
* ide_xlate_1024() will take care of the necessary
* adjustments to fool fdisk/LILO and partition check.
*/
if (ide_xlate_1024(dev, -1, " [EZD]")) {
data += 512;
goto check_table;
}
} else if (SYS_IND(p) == DM6_PARTITION) {
/*
* Everything on the disk is offset by 63 sectors,
* including a "new" MBR with its own partition table,
* and the remainder of the disk must be accessed using
* a translated geometry that reduces the number of
* apparent cylinders to less than 1024 if possible.
*
* ide_xlate_1024() will take care of the necessary
* adjustments to fool fdisk/LILO and partition check.
*/
if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) {
brelse(bh);
goto read_mbr; /* start over with new MBR */
}
} else if (sig <= 0x1ae &&
*(unsigned short *)(data + sig) == cpu_to_le16(0x55AA) &&
(1 & *(unsigned char *)(data + sig + 2))) {
/* DM6 signature in MBR, courtesy of OnTrack */
(void) ide_xlate_1024 (dev, 0, " [DM6:MBR]");
} else if (SYS_IND(p) == DM6_AUX1PARTITION || SYS_IND(p) == DM6_AUX3PARTITION) {
/*
* DM6 on other than the first (boot) drive
*/
(void) ide_xlate_1024(dev, 0, " [DM6:AUX]");
} else {
/*
* Examine the partition table for common translations.
* This is useful for drives in situations where the
* translated geometry is unavailable from the BIOS.
*/
for (i = 0; i < 4; i++) {
struct partition *q = &p[i];
if (NR_SECTS(q)
&& (q->sector & 63) == 1
&& (q->end_sector & 63) == 63) {
unsigned int heads = q->end_head + 1;
if (heads == 32 || heads == 64 ||
heads == 128 || heads == 240 ||
heads == 255) {
(void) ide_xlate_1024(dev, heads, " [PTBL]");
break;
}
}
}
}
}
#endif /* CONFIG_BLK_DEV_IDE */
current_minor += 4; /* first "extra" minor (for extended partitions) */
for (i=1 ; i<=4 ; minor++,i++,p++) {
if (!NR_SECTS(p))
continue;
add_gd_partition(hd, minor, first_sector+START_SECT(p)*sector_size, NR_SECTS(p)*sector_size,
ptype(SYS_IND(p)));
hd->part[minor].sys_ind = SYS_IND(p); // Hijack
if (is_extended_partition(p)) {
printk(" <");
/*
* If we are rereading the partition table, we need
* to set the size of the partition so that we will
* be able to bread the block containing the extended
* partition info.
*/
hd->sizes[minor] = hd->part[minor].nr_sects
>> (BLOCK_SIZE_BITS - 9);
extended_partition(hd, MKDEV(hd->major, minor));
printk(" >");
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
if (hd->part[minor].nr_sects > 2)
hd->part[minor].nr_sects = 2;
}
#ifdef CONFIG_BSD_DISKLABEL
/* tag first disklabel for late recognition */
if (SYS_IND(p) == BSD_PARTITION || SYS_IND(p) == NETBSD_PARTITION) {
printk("!");
if (!bsd_kdev)
bsd_kdev = MKDEV(hd->major, minor);
} else if (SYS_IND(p) == OPENBSD_PARTITION) {
printk("!");
if (!bsd_kdev) {
bsd_kdev = MKDEV(hd->major, minor);
bsd_maxpart = OPENBSD_MAXPARTITIONS;
}
}
#endif
#ifdef CONFIG_UNIXWARE_DISKLABEL
if (SYS_IND(p) == UNIXWARE_PARTITION)
unixware_partition(hd, MKDEV(hd->major, minor));
#endif
#ifdef CONFIG_SOLARIS_X86_PARTITION
/* [email protected]: Solaris has a nasty indicator: 0x82
* which also means linux swap. For that reason, all
* of the prints are done inside the
* solaris_x86_partition routine */
if(SYS_IND(p) == SOLARIS_X86_PARTITION) {
solaris_x86_partition(hd, MKDEV(hd->major, minor),
first_sector+START_SECT(p));
}
#endif
}
#ifdef CONFIG_BSD_DISKLABEL
if (bsd_kdev) {
printk(" <");
bsd_disklabel_partition(hd, bsd_kdev, bsd_maxpart);
printk(" >");
}
#endif
/*
* Check for old-style Disk Manager partition table
*/
if (*(unsigned short *) (data+0xfc) == cpu_to_le16(MSDOS_LABEL_MAGIC)) {
p = (struct partition *) (0x1be + data);
for (i = 4 ; i < 16 ; i++, current_minor++) {
p--;
if ((current_minor & mask) == 0)
break;
if (!(START_SECT(p) && NR_SECTS(p)))
continue;
add_gd_partition(hd, current_minor, START_SECT(p),
NR_SECTS(p), 0);
}
}
printk("\n");
brelse(bh);
return 1;
}
static int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector)
{
int i, minor = current_minor;
struct buffer_head *bh;
struct partition *p;
unsigned char *data;
int mask = (1 << hd->minor_shift) - 1;
#ifdef CONFIG_BLK_DEV_IDE
int tested_for_xlate = 0;
read_mbr:
#endif
if (!(bh = bread(dev,0,1024))) {
printk(" unable to read partition table\n");
return -1;
}
data = bh->b_data;
/* In some cases we modify the geometry */
/* of the drive (below), so ensure that */
/* nobody else tries to re-use this data. */
bh->b_state = 0;
#ifdef __powerpc__
if (*(unsigned short *) (bh->b_data+510) == 0x55AA)
{ /* Little-endian partition table - adjust in place */
p = (struct partition *) (0x1BE + bh->b_data);
for (i=1 ; i<=4 ; i++,p++)
{
if (!p->nr_sects)
continue;
p->start_sect = _LE_to_BE_long(p->start_sect);
p->nr_sects = _LE_to_BE_long(p->nr_sects);
}
*(unsigned short *) (bh->b_data+510) = 0xAA55;
}
#endif
#ifdef CONFIG_BLK_DEV_IDE
check_table:
#endif
if (*(unsigned short *) (0x1fe + data) != 0xAA55) {
brelse(bh);
return 0;
}
p = (struct partition *) (0x1be + data);
#ifdef CONFIG_BLK_DEV_IDE
if (!tested_for_xlate++) { /* Do this only once per disk */
/*
* Look for various forms of IDE disk geometry translation
*/
extern int ide_xlate_1024(kdev_t, int, const char *);
unsigned int sig = *(unsigned short *)(data + 2);
if (SYS_IND(p) == EZD_PARTITION) {
/*
* The remainder of the disk must be accessed using
* a translated geometry that reduces the number of
* apparent cylinders to less than 1024 if possible.
*
* ide_xlate_1024() will take care of the necessary
* adjustments to fool fdisk/LILO and partition check.
*/
if (ide_xlate_1024(dev, -1, " [EZD]")) {
data += 512;
goto check_table;
}
} else if (SYS_IND(p) == DM6_PARTITION) {
/*
* Everything on the disk is offset by 63 sectors,
* including a "new" MBR with its own partition table,
* and the remainder of the disk must be accessed using
* a translated geometry that reduces the number of
* apparent cylinders to less than 1024 if possible.
*
* ide_xlate_1024() will take care of the necessary
* adjustments to fool fdisk/LILO and partition check.
*/
if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) {
brelse(bh);
goto read_mbr; /* start over with new MBR */
}
} else if (sig <= 0x1ae && *(unsigned short *)(data + sig) == 0x55AA
&& (1 & *(unsigned char *)(data + sig + 2)) )
{
/*
* DM6 signature in MBR, courtesy of OnTrack
*/
(void) ide_xlate_1024 (dev, 0, " [DM6:MBR]");
} else if (SYS_IND(p) == DM6_AUX1PARTITION || SYS_IND(p) == DM6_AUX3PARTITION) {
/*
* DM6 on other than the first (boot) drive
*/
(void) ide_xlate_1024(dev, 0, " [DM6:AUX]");
} else {
/*
* Examine the partition table for common translations.
* This is necessary for drives for situations where
* the translated geometry is unavailable from the BIOS.
*/
for (i = 0; i < 4 ; i++) {
struct partition *q = &p[i];
if (NR_SECTS(q)
&& (q->sector & 63) == 1
&& (q->end_sector & 63) == 63) {
unsigned int heads = q->end_head + 1;
if (heads == 32 || heads == 64 || heads == 128 || heads == 255) {
(void) ide_xlate_1024(dev, heads, " [PTBL]");
break;
}
}
}
}
}
#endif /* CONFIG_BLK_DEV_IDE */
current_minor += 4; /* first "extra" minor (for extended partitions) */
for (i=1 ; i<=4 ; minor++,i++,p++) {
if (!NR_SECTS(p))
continue;
add_partition(hd, minor, first_sector+START_SECT(p), NR_SECTS(p));
if (is_extended_partition(p)) {
printk(" <");
/*
* If we are rereading the partition table, we need
* to set the size of the partition so that we will
* be able to bread the block containing the extended
* partition info.
*/
hd->sizes[minor] = hd->part[minor].nr_sects
>> (BLOCK_SIZE_BITS - 9);
extended_partition(hd, MKDEV(hd->major, minor));
printk(" >");
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
if (hd->part[minor].nr_sects > 2)
hd->part[minor].nr_sects = 2;
}
#ifdef CONFIG_BSD_DISKLABEL
if (SYS_IND(p) == BSD_PARTITION) {
printk(" <");
bsd_disklabel_partition(hd, MKDEV(hd->major, minor));
printk(" >");
}
#endif
}
/*
* Check for old-style Disk Manager partition table
*/
if (*(unsigned short *) (data+0xfc) == 0x55AA) {
p = (struct partition *) (0x1be + data);
for (i = 4 ; i < 16 ; i++, current_minor++) {
p--;
if ((current_minor & mask) == 0)
break;
if (!(START_SECT(p) && NR_SECTS(p)))
continue;
add_partition(hd, current_minor, START_SECT(p), NR_SECTS(p));
}
}
printk("\n");
brelse(bh);
return 1;
}
