[net-next-2.6.git] / fs / partitions / msdos.c

/*
 *  fs/partitions/msdos.c
 *
 *  Code extracted from drivers/block/genhd.c
 *  Copyright (C) 1991-1998  Linus Torvalds
 *
 *  Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
 *  in the early extended-partition checks and added DM partitions
 *
 *  Support for DiskManager v6.0x added by Mark Lord,
 *  with information provided by OnTrack.  This now works for linux fdisk
 *  and LILO, as well as loadlin and bootln.  Note that disks other than
 *  /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1).
 *
 *  More flexible handling of extended partitions - aeb, 950831
 *
 *  Check partition table on IDE disks for common CHS translations
 *
 *  Re-organised Feb 1998 Russell King
 */


#include "check.h"
#include "msdos.h"
#include "efi.h"

/*
 * Many architectures don't like unaligned accesses, while
 * the nr_sects and start_sect partition table entries are
 * at a 2 (mod 4) address.
 */
#include <asm/unaligned.h>

#define SYS_IND(p)	(get_unaligned(&p->sys_ind))
#define NR_SECTS(p)	({ __le32 __a =	get_unaligned(&p->nr_sects);	\
				le32_to_cpu(__a); \
			})

#define START_SECT(p)	({ __le32 __a =	get_unaligned(&p->start_sect);	\
				le32_to_cpu(__a); \
			})

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);
}

#define MSDOS_LABEL_MAGIC1	0x55
#define MSDOS_LABEL_MAGIC2	0xAA

static inline int
msdos_magic_present(unsigned char *p)
{
	return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
}

/* Value is EBCDIC 'IBMA' */
#define AIX_LABEL_MAGIC1	0xC9
#define AIX_LABEL_MAGIC2	0xC2
#define AIX_LABEL_MAGIC3	0xD4
#define AIX_LABEL_MAGIC4	0xC1
static int aix_magic_present(unsigned char *p, struct block_device *bdev)
{
	struct partition *pt = (struct partition *) (p + 0x1be);
	Sector sect;
	unsigned char *d;
	int slot, ret = 0;

	if (!(p[0] == AIX_LABEL_MAGIC1 &&
		p[1] == AIX_LABEL_MAGIC2 &&
		p[2] == AIX_LABEL_MAGIC3 &&
		p[3] == AIX_LABEL_MAGIC4))
		return 0;
	/* Assume the partition table is valid if Linux partitions exists */
	for (slot = 1; slot <= 4; slot++, pt++) {
		if (pt->sys_ind == LINUX_SWAP_PARTITION ||
			pt->sys_ind == LINUX_RAID_PARTITION ||
			pt->sys_ind == LINUX_DATA_PARTITION ||
			pt->sys_ind == LINUX_LVM_PARTITION ||
			is_extended_partition(pt))
			return 0;
	}
	d = read_dev_sector(bdev, 7, &sect);
	if (d) {
		if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
			ret = 1;
		put_dev_sector(sect);
	};
	return ret;
}

/*
 * Create devices for each logical partition in an extended partition.
 * The logical partitions form a linked list, with each entry being
 * a partition table with two entries.  The first entry
 * is the real data partition (with a start relative to the partition
 * table start).  The second is a pointer to the next logical partition
 * (with a start relative to the entire extended partition).
 * We do not create a Linux partition for the partition tables, but
 * only for the actual data partitions.
 */

static void
parse_extended(struct parsed_partitions *state, struct block_device *bdev,
			u32 first_sector, u32 first_size)
{
	struct partition *p;
	Sector sect;
	unsigned char *data;
	u32 this_sector, this_size;
	int sector_size = bdev_hardsect_size(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_dev_sector(bdev, this_sector, &sect);
		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++) {
			u32 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);
}

/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
   indicates linux swap.  Be careful before believing this is Solaris. */

static void
parse_solaris_x86(struct parsed_partitions *state, struct block_device *bdev,
			u32 offset, u32 size, int origin)
{
#ifdef CONFIG_SOLARIS_X86_PARTITION
	Sector sect;
	struct solaris_x86_vtoc *v;
	int i;
	short max_nparts;

	v = (struct solaris_x86_vtoc *)read_dev_sector(bdev, offset+1, &sect);
	if (!v)
		return;
	if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
		put_dev_sector(sect);
		return;
	}
	printk(" %s%d: <solaris:", state->name, origin);
	if (le32_to_cpu(v->v_version) != 1) {
		printk("  cannot handle version %d vtoc>\n",
			le32_to_cpu(v->v_version));
		put_dev_sector(sect);
		return;
	}
	/* Ensure we can handle previous case of VTOC with 8 entries gracefully */
	max_nparts = le16_to_cpu (v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
	for (i=0; i<max_nparts && state->next<state->limit; i++) {
		struct solaris_x86_slice *s = &v->v_slice[i];
		if (s->s_size == 0)
			continue;
		printk(" [s%d]", i);
		/* solaris partitions are relative to current MS-DOS
		 * one; must add the offset of the current partition */
		put_partition(state, state->next++,
				 le32_to_cpu(s->s_start)+offset,
				 le32_to_cpu(s->s_size));
	}
	put_dev_sector(sect);
	printk(" >\n");
#endif
}

#if defined(CONFIG_BSD_DISKLABEL)
/* 
 * Create devices for BSD partitions listed in a disklabel, under a
 * dos-like partition. See parse_extended() for more information.
 */
static void
parse_bsd(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin, char *flavour,
		int max_partitions)
{
	Sector sect;
	struct bsd_disklabel *l;
	struct bsd_partition *p;

	l = (struct bsd_disklabel *)read_dev_sector(bdev, offset+1, &sect);
	if (!l)
		return;
	if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
		put_dev_sector(sect);
		return;
	}
	printk(" %s%d: <%s:", state->name, origin, flavour);

	if (le16_to_cpu(l->d_npartitions) < max_partitions)
		max_partitions = le16_to_cpu(l->d_npartitions);
	for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
		u32 bsd_start, bsd_size;

		if (state->next == state->limit)
			break;
		if (p->p_fstype == BSD_FS_UNUSED) 
			continue;
		bsd_start = le32_to_cpu(p->p_offset);
		bsd_size = le32_to_cpu(p->p_size);
		if (offset == bsd_start && size == bsd_size)
			/* full parent partition, we have it already */
			continue;
		if (offset > bsd_start || offset+size < bsd_start+bsd_size) {
			printk("bad subpartition - ignored\n");
			continue;
		}
		put_partition(state, state->next++, bsd_start, bsd_size);
	}
	put_dev_sector(sect);
	if (le16_to_cpu(l->d_npartitions) > max_partitions)
		printk(" (ignored %d more)",
		       le16_to_cpu(l->d_npartitions) - max_partitions);
	printk(" >\n");
}
#endif

static void
parse_freebsd(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin)
{
#ifdef CONFIG_BSD_DISKLABEL
	parse_bsd(state, bdev, offset, size, origin,
			"bsd", BSD_MAXPARTITIONS);
#endif
}

static void
parse_netbsd(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin)
{
#ifdef CONFIG_BSD_DISKLABEL
	parse_bsd(state, bdev, offset, size, origin,
			"netbsd", BSD_MAXPARTITIONS);
#endif
}

static void
parse_openbsd(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin)
{
#ifdef CONFIG_BSD_DISKLABEL
	parse_bsd(state, bdev, offset, size, origin,
			"openbsd", OPENBSD_MAXPARTITIONS);
#endif
}

/*
 * Create devices for Unixware partitions listed in a disklabel, under a
 * dos-like partition. See parse_extended() for more information.
 */
static void
parse_unixware(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin)
{
#ifdef CONFIG_UNIXWARE_DISKLABEL
	Sector sect;
	struct unixware_disklabel *l;
	struct unixware_slice *p;

	l = (struct unixware_disklabel *)read_dev_sector(bdev, offset+29, &sect);
	if (!l)
		return;
	if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
	    le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
		put_dev_sector(sect);
		return;
	}
	printk(" %s%d: <unixware:", state->name, origin);
	p = &l->vtoc.v_slice[1];
	/* I omit the 0th slice as it is the same as whole disk. */
	while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
		if (state->next == state->limit)
			break;

		if (p->s_label != UNIXWARE_FS_UNUSED)
			put_partition(state, state->next++,
						START_SECT(p), NR_SECTS(p));
		p++;
	}
	put_dev_sector(sect);
	printk(" >\n");
#endif
}

/*
 * Minix 2.0.0/2.0.2 subpartition support.
 * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
 * Rajeev V. Pillai    <rajeevvp@yahoo.com>
 */
static void
parse_minix(struct parsed_partitions *state, struct block_device *bdev,
		u32 offset, u32 size, int origin)
{
#ifdef CONFIG_MINIX_SUBPARTITION
	Sector sect;
	unsigned char *data;
	struct partition *p;
	int i;

	data = read_dev_sector(bdev, offset, &sect);
	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 */
}

static struct {
	unsigned char id;
	void (*parse)(struct parsed_partitions *, struct block_device *,
			u32, u32, int);
} subtypes[] = {
	{FREEBSD_PARTITION, parse_freebsd},
	{NETBSD_PARTITION, parse_netbsd},
	{OPENBSD_PARTITION, parse_openbsd},
	{MINIX_PARTITION, parse_minix},
	{UNIXWARE_PARTITION, parse_unixware},
	{SOLARIS_X86_PARTITION, parse_solaris_x86},
	{NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
	{0, NULL},
};
 
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, &sect);
	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;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* fs/partitions/msdos.c
	3	*
	4	* Code extracted from drivers/block/genhd.c
	5	* Copyright (C) 1991-1998 Linus Torvalds
	6	*
	7	* Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
	8	* in the early extended-partition checks and added DM partitions
	9	*
	10	* Support for DiskManager v6.0x added by Mark Lord,
	11	* with information provided by OnTrack. This now works for linux fdisk
	12	* and LILO, as well as loadlin and bootln. Note that disks other than
	13	* /dev/hda must have a "DOS" type 0x51 partition in the first slot (hda1).
	14	*
	15	* More flexible handling of extended partitions - aeb, 950831
	16	*
	17	* Check partition table on IDE disks for common CHS translations
	18	*
	19	* Re-organised Feb 1998 Russell King
	20	*/
	21
1da177e4 LT	22
	23	#include "check.h"
	24	#include "msdos.h"
	25	#include "efi.h"
	26
	27	/*
	28	* Many architectures don't like unaligned accesses, while
	29	* the nr_sects and start_sect partition table entries are
	30	* at a 2 (mod 4) address.
	31	*/
	32	#include <asm/unaligned.h>
	33
	34	#define SYS_IND(p) (get_unaligned(&p->sys_ind))
3524de1c	35	#define NR_SECTS(p) ({ __le32 __a = get_unaligned(&p->nr_sects); \
1da177e4 LT	36	le32_to_cpu(__a); \
	37	})
	38
3524de1c	39	#define START_SECT(p) ({ __le32 __a = get_unaligned(&p->start_sect); \
1da177e4 LT	40	le32_to_cpu(__a); \
	41	})
	42
	43	static inline int is_extended_partition(struct partition *p)
	44	{
	45	return (SYS_IND(p) == DOS_EXTENDED_PARTITION \|\|
	46	SYS_IND(p) == WIN98_EXTENDED_PARTITION \|\|
	47	SYS_IND(p) == LINUX_EXTENDED_PARTITION);
	48	}
	49
	50	#define MSDOS_LABEL_MAGIC1 0x55
	51	#define MSDOS_LABEL_MAGIC2 0xAA
	52
	53	static inline int
	54	msdos_magic_present(unsigned char *p)
	55	{
	56	return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
	57	}
	58
e1dfa92d OH	59	/* Value is EBCDIC 'IBMA' */
	60	#define AIX_LABEL_MAGIC1 0xC9
	61	#define AIX_LABEL_MAGIC2 0xC2
	62	#define AIX_LABEL_MAGIC3 0xD4
	63	#define AIX_LABEL_MAGIC4 0xC1
	64	static int aix_magic_present(unsigned char p, struct block_device bdev)
	65	{
4419d1ac	66	struct partition pt = (struct partition ) (p + 0x1be);
e1dfa92d OH	67	Sector sect;
e1dfa92d OH	68	unsigned char *d;
4419d1ac	69	int slot, ret = 0;
e1dfa92d	70
a470e18f OH	71	if (!(p[0] == AIX_LABEL_MAGIC1 &&
	72	p[1] == AIX_LABEL_MAGIC2 &&
	73	p[2] == AIX_LABEL_MAGIC3 &&
	74	p[3] == AIX_LABEL_MAGIC4))
e1dfa92d	75	return 0;
4419d1ac OH	76	/* Assume the partition table is valid if Linux partitions exists */
	77	for (slot = 1; slot <= 4; slot++, pt++) {
	78	if (pt->sys_ind == LINUX_SWAP_PARTITION \|\|
	79	pt->sys_ind == LINUX_RAID_PARTITION \|\|
	80	pt->sys_ind == LINUX_DATA_PARTITION \|\|
	81	pt->sys_ind == LINUX_LVM_PARTITION \|\|
	82	is_extended_partition(pt))
	83	return 0;
	84	}
e1dfa92d OH	85	d = read_dev_sector(bdev, 7, &sect);
	86	if (d) {
	87	if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M')
	88	ret = 1;
	89	put_dev_sector(sect);
	90	};
	91	return ret;
	92	}
	93
1da177e4 LT	94	/*
	95	* Create devices for each logical partition in an extended partition.
	96	* The logical partitions form a linked list, with each entry being
	97	* a partition table with two entries. The first entry
	98	* is the real data partition (with a start relative to the partition
	99	* table start). The second is a pointer to the next logical partition
	100	* (with a start relative to the entire extended partition).
	101	* We do not create a Linux partition for the partition tables, but
	102	* only for the actual data partitions.
	103	*/
	104
	105	static void
	106	parse_extended(struct parsed_partitions state, struct block_device bdev,
	107	u32 first_sector, u32 first_size)
	108	{
	109	struct partition *p;
	110	Sector sect;
	111	unsigned char *data;
	112	u32 this_sector, this_size;
	113	int sector_size = bdev_hardsect_size(bdev) / 512;
	114	int loopct = 0; /* number of links followed
	115	without finding a data partition */
	116	int i;
	117
	118	this_sector = first_sector;
	119	this_size = first_size;
	120
	121	while (1) {
	122	if (++loopct > 100)
	123	return;
	124	if (state->next == state->limit)
	125	return;
	126	data = read_dev_sector(bdev, this_sector, &sect);
	127	if (!data)
	128	return;
	129
	130	if (!msdos_magic_present(data + 510))
	131	goto done;
	132
	133	p = (struct partition *) (data + 0x1be);
	134
	135	/*
	136	* Usually, the first entry is the real data partition,
	137	* the 2nd entry is the next extended partition, or empty,
	138	* and the 3rd and 4th entries are unused.
	139	* However, DRDOS sometimes has the extended partition as
	140	* the first entry (when the data partition is empty),
	141	* and OS/2 seems to use all four entries.
	142	*/
	143
	144	/*
	145	* First process the data partition(s)
	146	*/
	147	for (i=0; i<4; i++, p++) {
	148	u32 offs, size, next;
1da177e4 LT	149	if (!NR_SECTS(p) \|\| is_extended_partition(p))
	150	continue;
	151
	152	/* Check the 3rd and 4th entries -
	153	these sometimes contain random garbage */
	154	offs = START_SECT(p)*sector_size;
	155	size = NR_SECTS(p)*sector_size;
	156	next = this_sector + offs;
	157	if (i >= 2) {
	158	if (offs + size > this_size)
	159	continue;
	160	if (next < first_sector)
	161	continue;
	162	if (next + size > first_sector + first_size)
	163	continue;
	164	}
	165
	166	put_partition(state, state->next, next, size);
	167	if (SYS_IND(p) == LINUX_RAID_PARTITION)
d18d7682	168	state->parts[state->next].flags = ADDPART_FLAG_RAID;
1da177e4 LT	169	loopct = 0;
	170	if (++state->next == state->limit)
	171	goto done;
	172	}
	173	/*
	174	* Next, process the (first) extended partition, if present.
	175	* (So far, there seems to be no reason to make
	176	* parse_extended() recursive and allow a tree
	177	* of extended partitions.)
	178	* It should be a link to the next logical partition.
	179	*/
	180	p -= 4;
	181	for (i=0; i<4; i++, p++)
	182	if (NR_SECTS(p) && is_extended_partition(p))
	183	break;
	184	if (i == 4)
	185	goto done; /* nothing left to do */
	186
	187	this_sector = first_sector + START_SECT(p) * sector_size;
	188	this_size = NR_SECTS(p) * sector_size;
	189	put_dev_sector(sect);
	190	}
	191	done:
	192	put_dev_sector(sect);
	193	}
	194
	195	/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
	196	indicates linux swap. Be careful before believing this is Solaris. */
	197
	198	static void
	199	parse_solaris_x86(struct parsed_partitions state, struct block_device bdev,
	200	u32 offset, u32 size, int origin)
	201	{
	202	#ifdef CONFIG_SOLARIS_X86_PARTITION
	203	Sector sect;
	204	struct solaris_x86_vtoc *v;
	205	int i;
b84d8796	206	short max_nparts;
1da177e4 LT	207
	208	v = (struct solaris_x86_vtoc *)read_dev_sector(bdev, offset+1, &sect);
	209	if (!v)
	210	return;
	211	if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
	212	put_dev_sector(sect);
	213	return;
	214	}
	215	printk(" %s%d: <solaris:", state->name, origin);
	216	if (le32_to_cpu(v->v_version) != 1) {
	217	printk(" cannot handle version %d vtoc>\n",
	218	le32_to_cpu(v->v_version));
	219	put_dev_sector(sect);
	220	return;
	221	}
b84d8796 MF	222	/* Ensure we can handle previous case of VTOC with 8 entries gracefully */
	223	max_nparts = le16_to_cpu (v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8;
	224	for (i=0; i<max_nparts && state->next<state->limit; i++) {
1da177e4 LT	225	struct solaris_x86_slice *s = &v->v_slice[i];
	226	if (s->s_size == 0)
	227	continue;
	228	printk(" [s%d]", i);
	229	/* solaris partitions are relative to current MS-DOS
	230	* one; must add the offset of the current partition */
	231	put_partition(state, state->next++,
	232	le32_to_cpu(s->s_start)+offset,
	233	le32_to_cpu(s->s_size));
	234	}
	235	put_dev_sector(sect);
	236	printk(" >\n");
	237	#endif
	238	}
	239
486fd404	240	#if defined(CONFIG_BSD_DISKLABEL)
1da177e4 LT	241	/*
	242	* Create devices for BSD partitions listed in a disklabel, under a
	243	* dos-like partition. See parse_extended() for more information.
	244	*/
486fd404	245	static void
1da177e4 LT	246	parse_bsd(struct parsed_partitions state, struct block_device bdev,
	247	u32 offset, u32 size, int origin, char *flavour,
	248	int max_partitions)
	249	{
	250	Sector sect;
	251	struct bsd_disklabel *l;
	252	struct bsd_partition *p;
	253
	254	l = (struct bsd_disklabel *)read_dev_sector(bdev, offset+1, &sect);
	255	if (!l)
	256	return;
	257	if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
	258	put_dev_sector(sect);
	259	return;
	260	}
	261	printk(" %s%d: <%s:", state->name, origin, flavour);
	262
	263	if (le16_to_cpu(l->d_npartitions) < max_partitions)
	264	max_partitions = le16_to_cpu(l->d_npartitions);
	265	for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
	266	u32 bsd_start, bsd_size;
	267
	268	if (state->next == state->limit)
	269	break;
	270	if (p->p_fstype == BSD_FS_UNUSED)
	271	continue;
	272	bsd_start = le32_to_cpu(p->p_offset);
	273	bsd_size = le32_to_cpu(p->p_size);
	274	if (offset == bsd_start && size == bsd_size)
	275	/* full parent partition, we have it already */
	276	continue;
	277	if (offset > bsd_start \|\| offset+size < bsd_start+bsd_size) {
	278	printk("bad subpartition - ignored\n");
	279	continue;
	280	}
	281	put_partition(state, state->next++, bsd_start, bsd_size);
	282	}
	283	put_dev_sector(sect);
	284	if (le16_to_cpu(l->d_npartitions) > max_partitions)
	285	printk(" (ignored %d more)",
	286	le16_to_cpu(l->d_npartitions) - max_partitions);
	287	printk(" >\n");
	288	}
	289	#endif
	290
	291	static void
	292	parse_freebsd(struct parsed_partitions state, struct block_device bdev,
	293	u32 offset, u32 size, int origin)
	294	{
	295	#ifdef CONFIG_BSD_DISKLABEL
	296	parse_bsd(state, bdev, offset, size, origin,
	297	"bsd", BSD_MAXPARTITIONS);
	298	#endif
	299	}
	300
	301	static void
	302	parse_netbsd(struct parsed_partitions state, struct block_device bdev,
	303	u32 offset, u32 size, int origin)
	304	{
	305	#ifdef CONFIG_BSD_DISKLABEL
	306	parse_bsd(state, bdev, offset, size, origin,
	307	"netbsd", BSD_MAXPARTITIONS);
	308	#endif
	309	}
310
311	static void
312	parse_openbsd(struct parsed_partitions state, struct block_device bdev,
313	u32 offset, u32 size, int origin)
314	{
315	#ifdef CONFIG_BSD_DISKLABEL
316	parse_bsd(state, bdev, offset, size, origin,
317	"openbsd", OPENBSD_MAXPARTITIONS);
318	#endif
319	}
320
321	/*
322	* Create devices for Unixware partitions listed in a disklabel, under a
323	* dos-like partition. See parse_extended() for more information.
324	*/
325	static void
326	parse_unixware(struct parsed_partitions state, struct block_device bdev,
327	u32 offset, u32 size, int origin)
328	{
329	#ifdef CONFIG_UNIXWARE_DISKLABEL
330	Sector sect;
331	struct unixware_disklabel *l;
332	struct unixware_slice *p;
333
334	l = (struct unixware_disklabel *)read_dev_sector(bdev, offset+29, &sect);
335	if (!l)
336	return;
337	if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC \|\|
338	le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
339	put_dev_sector(sect);
340	return;
341	}
342	printk(" %s%d: <unixware:", state->name, origin);
343	p = &l->vtoc.v_slice[1];
344	/* I omit the 0th slice as it is the same as whole disk. */
345	while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
346	if (state->next == state->limit)
347	break;
348
349	if (p->s_label != UNIXWARE_FS_UNUSED)
350	put_partition(state, state->next++,
351	START_SECT(p), NR_SECTS(p));
352	p++;
353	}
354	put_dev_sector(sect);
355	printk(" >\n");
356	#endif
357	}
358
359	/*
360	* Minix 2.0.0/2.0.2 subpartition support.
361	* Anand Krishnamurthy <anandk@wiproge.med.ge.com>
362	* Rajeev V. Pillai <rajeevvp@yahoo.com>
363	*/
364	static void
365	parse_minix(struct parsed_partitions state, struct block_device bdev,
366	u32 offset, u32 size, int origin)
367	{
368	#ifdef CONFIG_MINIX_SUBPARTITION
369	Sector sect;
370	unsigned char *data;
371	struct partition *p;
372	int i;
373
374	data = read_dev_sector(bdev, offset, &sect);
375	if (!data)
376	return;
377
378	p = (struct partition *)(data + 0x1be);
379
380	/* The first sector of a Minix partition can have either
381	* a secondary MBR describing its subpartitions, or
382	* the normal boot sector. */
383	if (msdos_magic_present (data + 510) &&
384	SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
385
386	printk(" %s%d: <minix:", state->name, origin);
387	for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
388	if (state->next == state->limit)
389	break;
390	/* add each partition in use */
391	if (SYS_IND(p) == MINIX_PARTITION)
392	put_partition(state, state->next++,
393	START_SECT(p), NR_SECTS(p));
394	}
395	printk(" >\n");
396	}
397	put_dev_sector(sect);
398	#endif /* CONFIG_MINIX_SUBPARTITION */
399	}
400
401	static struct {
402	unsigned char id;
403	void (parse)(struct parsed_partitions , struct block_device *,
404	u32, u32, int);
405	} subtypes[] = {
406	{FREEBSD_PARTITION, parse_freebsd},
407	{NETBSD_PARTITION, parse_netbsd},
408	{OPENBSD_PARTITION, parse_openbsd},
409	{MINIX_PARTITION, parse_minix},
410	{UNIXWARE_PARTITION, parse_unixware},
411	{SOLARIS_X86_PARTITION, parse_solaris_x86},
412	{NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
413	{0, NULL},
414	};
415
416	int msdos_partition(struct parsed_partitions state, struct block_device bdev)
417	{
418	int sector_size = bdev_hardsect_size(bdev) / 512;
419	Sector sect;
420	unsigned char *data;
421	struct partition *p;
422	int slot;
423
424	data = read_dev_sector(bdev, 0, &sect);
425	if (!data)
426	return -1;
427	if (!msdos_magic_present(data + 510)) {
428	put_dev_sector(sect);
429	return 0;
430	}
431
e1dfa92d OH	432	if (aix_magic_present(data, bdev)) {
	433	put_dev_sector(sect);
	434	printk( " [AIX]");
	435	return 0;
	436	}
	437
1da177e4 LT	438	/*
	439	* Now that the 55aa signature is present, this is probably
	440	* either the boot sector of a FAT filesystem or a DOS-type
	441	* partition table. Reject this in case the boot indicator
	442	* is not 0 or 0x80.
	443	*/
	444	p = (struct partition *) (data + 0x1be);
	445	for (slot = 1; slot <= 4; slot++, p++) {
	446	if (p->boot_ind != 0 && p->boot_ind != 0x80) {
	447	put_dev_sector(sect);
	448	return 0;
	449	}
	450	}
	451
	452	#ifdef CONFIG_EFI_PARTITION
	453	p = (struct partition *) (data + 0x1be);
	454	for (slot = 1 ; slot <= 4 ; slot++, p++) {
	455	/* If this is an EFI GPT disk, msdos should ignore it. */
	456	if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
	457	put_dev_sector(sect);
	458	return 0;
	459	}
	460	}
	461	#endif
	462	p = (struct partition *) (data + 0x1be);
	463
	464	/*
	465	* Look for partitions in two passes:
	466	* First find the primary and DOS-type extended partitions.
	467	* On the second pass look inside *BSD, Unixware and Solaris partitions.
	468	*/
	469
	470	state->next = 5;
	471	for (slot = 1 ; slot <= 4 ; slot++, p++) {
	472	u32 start = START_SECT(p)*sector_size;
	473	u32 size = NR_SECTS(p)*sector_size;
1da177e4 LT	474	if (!size)
	475	continue;
	476	if (is_extended_partition(p)) {
	477	/* prevent someone doing mkfs or mkswap on an
	478	extended partition, but leave room for LILO */
	479	put_partition(state, slot, start, size == 1 ? 1 : 2);
	480	printk(" <");
	481	parse_extended(state, bdev, start, size);
	482	printk(" >");
	483	continue;
	484	}
	485	put_partition(state, slot, start, size);
	486	if (SYS_IND(p) == LINUX_RAID_PARTITION)
	487	state->parts[slot].flags = 1;
	488	if (SYS_IND(p) == DM6_PARTITION)
	489	printk("[DM]");
	490	if (SYS_IND(p) == EZD_PARTITION)
	491	printk("[EZD]");
	492	}
	493
	494	printk("\n");
	495
	496	/* second pass - output for each on a separate line */
	497	p = (struct partition *) (0x1be + data);
	498	for (slot = 1 ; slot <= 4 ; slot++, p++) {
	499	unsigned char id = SYS_IND(p);
	500	int n;
	501
	502	if (!NR_SECTS(p))
	503	continue;
	504
	505	for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
	506	;
	507
	508	if (!subtypes[n].parse)
	509	continue;
	510	subtypes[n].parse(state, bdev, START_SECT(p)*sector_size,
	511	NR_SECTS(p)*sector_size, slot);
	512	}
	513	put_dev_sector(sect);
	514	return 1;
	515	}