static void parse_minix(struct parsed_partitions *state,
sector_t offset, sector_t size, int origin)
{
#ifdef CONFIG_MINIX_SUBPARTITION
Sector sect;
unsigned char *data;
struct partition *p;
int i;
data = read_part_sector(state, offset, §);
if (!data)
return;
p = (struct partition *)(data + 0x1be);
/* The first sector of a Minix partition can have either
* a secondary MBR describing its subpartitions, or
* the normal boot sector. */
if (msdos_magic_present (data + 510) &&
SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
printk(" %s%d: <minix:", state->name, origin);
for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
if (state->next == state->limit)
break;
/* add each partition in use */
if (SYS_IND(p) == MINIX_PARTITION)
put_partition(state, state->next++,
start_sect(p), nr_sects(p));
}
printk(" >\n");
}
put_dev_sector(sect);
#endif /* CONFIG_MINIX_SUBPARTITION */
}
/*
* Minix 2.0.0/2.0.2 subpartition support.
* Anand Krishnamurthy <*****@*****.**>
* Rajeev V. Pillai <*****@*****.**>
*/
static void minix_partition(struct gendisk *hd, struct block_device *bdev,
int minor, int *current_minor)
{
#ifdef CONFIG_MINIX_SUBPARTITION
long offset = hd->part[minor].start_sect;
Sector sect;
unsigned char *data;
struct partition *p;
int mask = (1 << hd->minor_shift) - 1;
int i;
char buf[40];
data = read_dev_sector(bdev, offset, §);
if (!data)
return;
p = (struct partition *)(data + 0x1be);
/* The first sector of a Minix partition can have either
* a secondary MBR describing its subpartitions, or
* the normal boot sector. */
if (msdos_magic_present (data + 510) &&
SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
printk(" %s: <minix:", partition_name(hd, minor, buf));
for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
if ((*current_minor & mask) == 0)
break;
/* add each partition in use */
if (SYS_IND(p) == MINIX_PARTITION) {
add_gd_partition(hd, *current_minor,
START_SECT(p), NR_SECTS(p));
(*current_minor)++;
}
}
printk(" >\n");
}
put_dev_sector(sect);
#endif /* CONFIG_MINIX_SUBPARTITION */
}
static void parse_extended(struct parsed_partitions *state,
sector_t first_sector, sector_t first_size)
{
struct partition *p;
Sector sect;
unsigned char *data;
sector_t this_sector, this_size;
sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
int loopct = 0; /* number of links followed
without finding a data partition */
int i;
this_sector = first_sector;
this_size = first_size;
while (1) {
if (++loopct > 100)
return;
if (state->next == state->limit)
return;
data = read_part_sector(state, this_sector, §);
if (!data)
return;
if (!msdos_magic_present(data + 510))
goto done;
p = (struct partition *) (data + 0x1be);
/*
* Usually, the first entry is the real data partition,
* the 2nd entry is the next extended partition, or empty,
* and the 3rd and 4th entries are unused.
* However, DRDOS sometimes has the extended partition as
* the first entry (when the data partition is empty),
* and OS/2 seems to use all four entries.
*/
/*
* First process the data partition(s)
*/
for (i=0; i<4; i++, p++) {
sector_t offs, size, next;
if (!nr_sects(p) || is_extended_partition(p))
continue;
/* Check the 3rd and 4th entries -
these sometimes contain random garbage */
offs = start_sect(p)*sector_size;
size = nr_sects(p)*sector_size;
next = this_sector + offs;
if (i >= 2) {
if (offs + size > this_size)
continue;
if (next < first_sector)
continue;
if (next + size > first_sector + first_size)
continue;
}
put_partition(state, state->next, next, size);
if (SYS_IND(p) == LINUX_RAID_PARTITION)
state->parts[state->next].flags = ADDPART_FLAG_RAID;
loopct = 0;
if (++state->next == state->limit)
goto done;
}
/*
* Next, process the (first) extended partition, if present.
* (So far, there seems to be no reason to make
* parse_extended() recursive and allow a tree
* of extended partitions.)
* It should be a link to the next logical partition.
*/
p -= 4;
for (i=0; i<4; i++, p++)
if (nr_sects(p) && is_extended_partition(p))
break;
if (i == 4)
goto done; /* nothing left to do */
this_sector = first_sector + start_sect(p) * sector_size;
this_size = nr_sects(p) * sector_size;
put_dev_sector(sect);
}
done:
put_dev_sector(sect);
}
int msdos_partition(struct parsed_partitions *state)
{
sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
Sector sect;
unsigned char *data;
struct partition *p;
struct fat_boot_sector *fb;
int slot;
data = read_part_sector(state, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
if (aix_magic_present(state, data)) {
put_dev_sector(sect);
printk( " [AIX]");
return 0;
}
/*
* Now that the 55aa signature is present, this is probably
* either the boot sector of a FAT filesystem or a DOS-type
* partition table. Reject this in case the boot indicator
* is not 0 or 0x80.
*/
p = (struct partition *) (data + 0x1be);
for (slot = 1; slot <= 4; slot++, p++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
/*
* Even without a valid boot inidicator value
* its still possible this is valid FAT filesystem
* without a partition table.
*/
fb = (struct fat_boot_sector *) data;
if (slot == 1 && fb->reserved && fb->fats
&& fat_valid_media(fb->media)) {
printk("\n");
put_dev_sector(sect);
return 1;
} else {
put_dev_sector(sect);
return 0;
}
}
}
#ifdef CONFIG_EFI_PARTITION
p = (struct partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
put_dev_sector(sect);
return 0;
}
}
#endif
p = (struct partition *) (data + 0x1be);
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
state->next = 5;
for (slot = 1 ; slot <= 4 ; slot++, p++) {
sector_t start = start_sect(p)*sector_size;
sector_t size = nr_sects(p)*sector_size;
if (!size)
continue;
if (is_extended_partition(p)) {
/*
* prevent someone doing mkfs or mkswap on an
* extended partition, but leave room for LILO
* FIXME: this uses one logical sector for > 512b
* sector, although it may not be enough/proper.
*/
sector_t n = 2;
n = min(size, max(sector_size, n));
put_partition(state, slot, start, n);
printk(" <");
parse_extended(state, start, size);
printk(" >");
continue;
}
put_partition(state, slot, start, size);
if (SYS_IND(p) == LINUX_RAID_PARTITION)
state->parts[slot].flags = ADDPART_FLAG_RAID;
if (SYS_IND(p) == DM6_PARTITION)
printk("[DM]");
if (SYS_IND(p) == EZD_PARTITION)
printk("[EZD]");
}
printk("\n");
/* second pass - output for each on a separate line */
p = (struct partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
unsigned char id = SYS_IND(p);
int n;
if (!nr_sects(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (!subtypes[n].parse)
continue;
subtypes[n].parse(state, start_sect(p) * sector_size,
nr_sects(p) * sector_size, slot);
}
put_dev_sector(sect);
return 1;
}
static inline int is_extended_partition(struct partition *p)
{
return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
SYS_IND(p) == LINUX_EXTENDED_PARTITION);
}
int msdos_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int sector_size = bdev_hardsect_size(bdev) / 512;
Sector sect;
unsigned char *data;
struct partition *p;
int slot;
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
if (aix_magic_present(data, bdev)) {
put_dev_sector(sect);
printk( " [AIX]");
return 0;
}
/*
* Now that the 55aa signature is present, this is probably
* either the boot sector of a FAT filesystem or a DOS-type
* partition table. Reject this in case the boot indicator
* is not 0 or 0x80.
*/
p = (struct partition *) (data + 0x1be);
for (slot = 1; slot <= 4; slot++, p++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
put_dev_sector(sect);
return 0;
}
}
#ifdef CONFIG_EFI_PARTITION
p = (struct partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
put_dev_sector(sect);
return 0;
}
}
#endif
p = (struct partition *) (data + 0x1be);
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
state->next = 5;
for (slot = 1 ; slot <= 4 ; slot++, p++) {
u32 start = START_SECT(p)*sector_size;
u32 size = NR_SECTS(p)*sector_size;
if (!size)
continue;
if (is_extended_partition(p)) {
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
put_partition(state, slot, start, size == 1 ? 1 : 2);
printk(" <");
parse_extended(state, bdev, start, size);
printk(" >");
continue;
}
put_partition(state, slot, start, size);
if (SYS_IND(p) == LINUX_RAID_PARTITION)
state->parts[slot].flags = 1;
if (SYS_IND(p) == DM6_PARTITION)
printk("[DM]");
if (SYS_IND(p) == EZD_PARTITION)
printk("[EZD]");
}
printk("\n");
/* second pass - output for each on a separate line */
p = (struct partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
unsigned char id = SYS_IND(p);
int n;
if (!NR_SECTS(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (!subtypes[n].parse)
continue;
subtypes[n].parse(state, bdev, START_SECT(p)*sector_size,
NR_SECTS(p)*sector_size, slot);
}
put_dev_sector(sect);
return 1;
}
static void extended_partition(struct gendisk *hd, kdev_t dev)
{
struct buffer_head *bh;
struct partition *p;
unsigned long first_sector, first_size, this_sector, this_size;
int mask = (1 << hd->minor_shift) - 1;
int sector_size = sector_partition_scale(dev);
int i;
first_sector = hd->part[MINOR(dev)].start_sect;
first_size = hd->part[MINOR(dev)].nr_sects;
this_sector = first_sector;
while (1) {
if ((current_minor & mask) == 0)
return;
if (!(bh = bread(dev,0,get_ptable_blocksize(dev))))
return;
/*
* This block is from a device that we're about to stomp on.
* So make sure nobody thinks this block is usable.
*/
bh->b_state = 0;
if ((*(__u16 *) (bh->b_data+510)) != cpu_to_le16(MSDOS_LABEL_MAGIC))
goto done;
p = (struct partition *) (0x1BE + bh->b_data);
this_size = hd->part[MINOR(dev)].nr_sects;
/*
* Usually, the first entry is the real data partition,
* the 2nd entry is the next extended partition, or empty,
* and the 3rd and 4th entries are unused.
* However, DRDOS sometimes has the extended partition as
* the first entry (when the data partition is empty),
* and OS/2 seems to use all four entries.
*/
/*
* First process the data partition(s)
*/
for (i=0; i<4; i++, p++) {
if (!NR_SECTS(p) || is_extended_partition(p))
continue;
/* Check the 3rd and 4th entries -
these sometimes contain random garbage */
if (i >= 2
&& START_SECT(p) + NR_SECTS(p) > this_size
&& (this_sector + START_SECT(p) < first_sector ||
this_sector + START_SECT(p) + NR_SECTS(p) >
first_sector + first_size))
continue;
add_gd_partition(hd, current_minor, this_sector+START_SECT(p)*sector_size,
NR_SECTS(p)*sector_size, ptype(SYS_IND(p)));
hd->part[current_minor].sys_ind = SYS_IND(p); // Hijack
current_minor++;
if ((current_minor & mask) == 0)
goto done;
}
/*
* Next, process the (first) extended partition, if present.
* (So far, there seems to be no reason to make
* extended_partition() recursive and allow a tree
* of extended partitions.)
* It should be a link to the next logical partition.
* Create a minor for this just long enough to get the next
* partition table. The minor will be reused for the next
* data partition.
*/
p -= 4;
for (i=0; i<4; i++, p++)
if(NR_SECTS(p) && is_extended_partition(p))
break;
if (i == 4)
goto done; /* nothing left to do */
hd->part[current_minor].nr_sects = NR_SECTS(p) * sector_size; /* JSt */
hd->part[current_minor].start_sect = first_sector + START_SECT(p) * sector_size;
this_sector = first_sector + START_SECT(p) * sector_size;
dev = MKDEV(hd->major, current_minor);
brelse(bh);
}
done:
brelse(bh);
}
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;
}
int msdos_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int first_part_minor)
{
int i, minor = first_part_minor;
Sector sect;
struct partition *p;
unsigned char *data;
int mask = (1 << hd->minor_shift) - 1;
int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512;
int current_minor = first_part_minor;
int err;
err = handle_ide_mess(bdev);
if (err <= 0)
return err;
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
p = (struct partition *) (data + 0x1be);
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
current_minor += 4;
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);
#if CONFIG_BLK_DEV_MD
if (SYS_IND(p) == LINUX_RAID_PARTITION) {
md_autodetect_dev(MKDEV(hd->major,minor));
}
#endif
if (is_extended_partition(p)) {
unsigned long size = hd->part[minor].nr_sects;
printk(" <");
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
if (size > 2)
hd->part[minor].nr_sects = 2;
extended_partition(hd, bdev, minor, size, ¤t_minor);
printk(" >");
}
}
/*
* Check for old-style Disk Manager partition table
*/
if (msdos_magic_present(data + 0xfc)) {
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));
}
}
printk("\n");
/* second pass - output for each on a separate line */
minor -= 4;
p = (struct partition *) (0x1be + data);
for (i=1 ; i<=4 ; minor++,i++,p++) {
unsigned char id = SYS_IND(p);
int n;
if (!NR_SECTS(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (subtypes[n].parse)
subtypes[n].parse(hd, bdev, minor, ¤t_minor);
}
put_dev_sector(sect);
return 1;
}
/*
* Look for various forms of IDE disk geometry translation
*/
static int handle_ide_mess(struct block_device *bdev)
{
#ifdef CONFIG_BLK_DEV_IDE
Sector sect;
unsigned char *data;
kdev_t dev = to_kdev_t(bdev->bd_dev);
unsigned int sig;
int heads = 0;
struct partition *p;
int i;
/*
* The i386 partition handling programs very often
* make partitions end on cylinder boundaries.
* There is no need to do so, and Linux fdisk doesnt always
* do this, and Windows NT on Alpha doesnt do this either,
* but still, this helps to guess #heads.
*/
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
sig = le16_to_cpu(*(unsigned short *)(data + 2));
p = (struct partition *) (data + 0x1be);
for (i = 0; i < 4; i++) {
struct partition *q = &p[i];
if (NR_SECTS(q)) {
if ((q->sector & 63) == 1 &&
(q->end_sector & 63) == 63)
heads = q->end_head + 1;
break;
}
}
if (SYS_IND(p) == EZD_PARTITION) {
/*
* Accesses to sector 0 must go to sector 1 instead.
*/
if (ide_xlate_1024(dev, -1, heads, " [EZD]"))
goto reread;
} 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.
*/
if (ide_xlate_1024(dev, 1, heads, " [DM6:DDO]"))
goto reread;
} else if (sig <= 0x1ae &&
data[sig] == 0xAA && data[sig+1] == 0x55 &&
(data[sig+2] & 1)) {
/* DM6 signature in MBR, courtesy of OnTrack */
(void) ide_xlate_1024 (dev, 0, heads, " [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, heads, " [DM6:AUX]");
} else {
(void) ide_xlate_1024(dev, 2, heads, " [PTBL]");
}
put_dev_sector(sect);
return 1;
reread:
put_dev_sector(sect);
/* Flush the cache */
invalidate_bdev(bdev, 1);
truncate_inode_pages(bdev->bd_inode->i_mapping, 0);
#endif /* CONFIG_BLK_DEV_IDE */
return 1;
}
static void extended_partition(struct gendisk *hd, struct block_device *bdev,
int minor, unsigned long first_size, int *current_minor)
{
struct partition *p;
Sector sect;
unsigned char *data;
unsigned long first_sector, this_sector, this_size;
int mask = (1 << hd->minor_shift) - 1;
int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512;
int loopct = 0; /* number of links followed
without finding a data partition */
int i;
this_sector = first_sector = hd->part[minor].start_sect;
this_size = first_size;
while (1) {
if (++loopct > 100)
return;
if ((*current_minor & mask) == 0)
return;
data = read_dev_sector(bdev, this_sector, §);
if (!data)
return;
if (!msdos_magic_present(data + 510))
goto done;
p = (struct partition *) (data + 0x1be);
/*
* Usually, the first entry is the real data partition,
* the 2nd entry is the next extended partition, or empty,
* and the 3rd and 4th entries are unused.
* However, DRDOS sometimes has the extended partition as
* the first entry (when the data partition is empty),
* and OS/2 seems to use all four entries.
*/
/*
* First process the data partition(s)
*/
for (i=0; i<4; i++, p++) {
unsigned long offs, size, next;
if (!NR_SECTS(p) || is_extended_partition(p))
continue;
/* Check the 3rd and 4th entries -
these sometimes contain random garbage */
offs = START_SECT(p)*sector_size;
size = NR_SECTS(p)*sector_size;
next = this_sector + offs;
if (i >= 2) {
if (offs + size > this_size)
continue;
if (next < first_sector)
continue;
if (next + size > first_sector + first_size)
continue;
}
add_gd_partition(hd, *current_minor, next, size);
#if CONFIG_BLK_DEV_MD
if (SYS_IND(p) == LINUX_RAID_PARTITION) {
md_autodetect_dev(MKDEV(hd->major,*current_minor));
}
#endif
(*current_minor)++;
loopct = 0;
if ((*current_minor & mask) == 0)
goto done;
}
/*
* Next, process the (first) extended partition, if present.
* (So far, there seems to be no reason to make
* extended_partition() recursive and allow a tree
* of extended partitions.)
* It should be a link to the next logical partition.
* Create a minor for this just long enough to get the next
* partition table. The minor will be reused for the next
* data partition.
*/
p -= 4;
for (i=0; i<4; i++, p++)
if (NR_SECTS(p) && is_extended_partition(p))
break;
if (i == 4)
goto done; /* nothing left to do */
this_sector = first_sector + START_SECT(p) * sector_size;
this_size = NR_SECTS(p) * sector_size;
minor = *current_minor;
put_dev_sector(sect);
}
done:
put_dev_sector(sect);
}
int msdos_partition(struct gendisk *hd, struct block_device *bdev,
unsigned long first_sector, int first_part_minor)
{
int i, minor = first_part_minor;
Sector sect;
struct partition *p;
unsigned char *data;
int mask = (1 << hd->minor_shift) - 1;
int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512;
int current_minor = first_part_minor;
int err;
#ifdef CONFIG_IDE_IPOD
int sector_mult = 1;
#endif
err = handle_ide_mess(bdev);
if (err <= 0)
return err;
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
p = (struct partition *) (data + 0x1be);
#ifdef CONFIG_IDE_IPOD
/*
* Addition for iPods: check for actual filesystems to figure out the correct partition layout
*/
for (i=1 ; i<=4 ; i++,p++) {
unsigned char *partdata;
if (!NR_SECTS(p))
continue;
if (SYS_IND(p) == 0xb) {
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*4, §);
if (msdos_magic_present(partdata + 510))
sector_mult = 4;
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*2, §);
if (msdos_magic_present(partdata + 510))
sector_mult = 2;
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size, §);
if (msdos_magic_present(partdata + 510))
sector_mult = 1;
} else if (SYS_IND(p) == 0x83) {
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*4+2, §);
if (ext3_magic_present(partdata + 56))
sector_mult = 4;
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*2+2, §);
if (ext3_magic_present(partdata + 56))
sector_mult = 2;
partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size+2, §);
if (ext3_magic_present(partdata + 56))
sector_mult = 1;
}
}
printk("Experimental partition and filesystem detection code by Vincent Huisman ([email protected])\n");
printk("Partition sector size: %d\n", sector_mult);
sector_size *= sector_mult;
p = (struct partition *) (data + 0x1be); // Reinitialize, duh
#endif
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
current_minor += 4;
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);
#if CONFIG_BLK_DEV_MD
if (SYS_IND(p) == LINUX_RAID_PARTITION) {
md_autodetect_dev(MKDEV(hd->major,minor));
}
#endif
if (is_extended_partition(p)) {
unsigned long size = hd->part[minor].nr_sects;
printk(" <");
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
if (size > 2)
hd->part[minor].nr_sects = 2;
extended_partition(hd, bdev, minor, size, ¤t_minor);
printk(" >");
}
}
/*
* Check for old-style Disk Manager partition table
*/
if (msdos_magic_present(data + 0xfc)) {
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));
}
}
printk("\n");
/* second pass - output for each on a separate line */
minor -= 4;
p = (struct partition *) (0x1be + data);
for (i=1 ; i<=4 ; minor++,i++,p++) {
unsigned char id = SYS_IND(p);
int n;
if (!NR_SECTS(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (subtypes[n].parse)
subtypes[n].parse(hd, bdev, minor, ¤t_minor);
}
put_dev_sector(sect);
return 1;
}
int msdos_partition(struct parsed_partitions *state, struct block_device *bdev)
{
int sector_size = bdev_hardsect_size(bdev) / 512;
Sector sect;
unsigned char *data;
struct partition *p;
int slot;
#ifdef HACK_PARTITION_TABLE_BOOT_IND
int check_times = 0;
#endif
data = read_dev_sector(bdev, 0, §);
if (!data)
return -1;
if (!msdos_magic_present(data + 510)) {
put_dev_sector(sect);
return 0;
}
/*
* Now that the 55aa signature is present, this is probably
* either the boot sector of a FAT filesystem or a DOS-type
* partition table. Reject this in case the boot indicator
* is not 0 or 0x80.
*/
p = (struct partition *) (data + 0x1be);
for (slot = 1; slot <= 4; slot++, p++) {
if (p->boot_ind != 0 && p->boot_ind != 0x80) {
#ifdef HACK_PARTITION_TABLE_BOOT_IND // hack for boot_ind != 0 && boot_ind != 0x80
printk("\n[cfyeh-hack] %s(%d) partition->boot_ind = 0x%.2x (should be 0x0 or 0x80)\n", __func__, __LINE__, p->boot_ind);
check_times++;
#else
put_dev_sector(sect);
return 0;
#endif
}
}
#ifdef HACK_PARTITION_TABLE_BOOT_IND // hack for boot_ind != 0 && boot_ind != 0x80
if(check_times > 1)
{
printk("[cfyeh-hack] %s(%d) partition->boot_ind fail %d times !!!\n", __func__, __LINE__, check_times);
put_dev_sector(sect);
return 0;
}
#endif
#ifdef CONFIG_EFI_PARTITION
p = (struct partition *) (data + 0x1be);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
/* If this is an EFI GPT disk, msdos should ignore it. */
if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
put_dev_sector(sect);
return 0;
}
}
#endif
p = (struct partition *) (data + 0x1be);
/*
* Look for partitions in two passes:
* First find the primary and DOS-type extended partitions.
* On the second pass look inside *BSD, Unixware and Solaris partitions.
*/
state->next = 5;
for (slot = 1 ; slot <= 4 ; slot++, p++) {
u32 start = START_SECT(p)*sector_size;
u32 size = NR_SECTS(p)*sector_size;
if (!size)
continue;
if (is_extended_partition(p)) {
// add to know which partition is a extended partition
// by cfyeh 2007/11/13 +
state->parts[slot].is_part_extended = 1;
// by cfyeh 2007/11/13 -
/* prevent someone doing mkfs or mkswap on an
extended partition, but leave room for LILO */
put_partition(state, slot, start, size == 1 ? 1 : 2);
printk(" <");
parse_extended(state, bdev, start, size);
printk(" >");
continue;
}
put_partition(state, slot, start, size);
if (SYS_IND(p) == LINUX_RAID_PARTITION)
state->parts[slot].flags = 1;
if (SYS_IND(p) == DM6_PARTITION)
printk("[DM]");
if (SYS_IND(p) == EZD_PARTITION)
printk("[EZD]");
}
printk("\n");
/* second pass - output for each on a separate line */
p = (struct partition *) (0x1be + data);
for (slot = 1 ; slot <= 4 ; slot++, p++) {
unsigned char id = SYS_IND(p);
int n;
if (!NR_SECTS(p))
continue;
for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
;
if (!subtypes[n].parse)
continue;
subtypes[n].parse(state, bdev, START_SECT(p)*sector_size,
NR_SECTS(p)*sector_size, slot);
}
put_dev_sector(sect);
return 1;
}