[linux-2.6-block.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)	({ __typeof__(p->nr_sects) __a =	\
				get_unaligned(&p->nr_sects);	\
				le32_to_cpu(__a); \
			})

#define START_SECT(p)	({ __typeof__(p->start_sect) __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);
}

/*
 * 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 = 1;
			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;

	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;
	}
	for (i=0; i<SOLARIS_X86_NUMSLICE && 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;
	}

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