[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 <linux/config.h>

#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) || defined(CONFIG_NEC98_PARTITION)
/* 
 * Create devices for BSD partitions listed in a disklabel, under a
 * dos-like partition. See parse_extended() for more information.
 */
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
	22	#include <linux/config.h>
	23
	24	#include "check.h"
	25	#include "msdos.h"
	26	#include "efi.h"
	27
	28	/*
	29	* Many architectures don't like unaligned accesses, while
	30	* the nr_sects and start_sect partition table entries are
	31	* at a 2 (mod 4) address.
	32	*/
	33	#include <asm/unaligned.h>
	34
	35	#define SYS_IND(p) (get_unaligned(&p->sys_ind))
	36	#define NR_SECTS(p) ({ __typeof__(p->nr_sects) __a = \
	37	get_unaligned(&p->nr_sects); \
	38	le32_to_cpu(__a); \
	39	})
	40
	41	#define START_SECT(p) ({ __typeof__(p->start_sect) __a = \
	42	get_unaligned(&p->start_sect); \
	43	le32_to_cpu(__a); \
	44	})
	45
	46	static inline int is_extended_partition(struct partition *p)
	47	{
	48	return (SYS_IND(p) == DOS_EXTENDED_PARTITION \|\|
	49	SYS_IND(p) == WIN98_EXTENDED_PARTITION \|\|
	50	SYS_IND(p) == LINUX_EXTENDED_PARTITION);
	51	}
	52
	53	#define MSDOS_LABEL_MAGIC1 0x55
	54	#define MSDOS_LABEL_MAGIC2 0xAA
	55
	56	static inline int
	57	msdos_magic_present(unsigned char *p)
	58	{
	59	return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2);
	60	}
	61
	62	/*
	63	* Create devices for each logical partition in an extended partition.
	64	* The logical partitions form a linked list, with each entry being
65	* a partition table with two entries. The first entry
66	* is the real data partition (with a start relative to the partition
67	* table start). The second is a pointer to the next logical partition
68	* (with a start relative to the entire extended partition).
69	* We do not create a Linux partition for the partition tables, but
70	* only for the actual data partitions.
71	*/
72
73	static void
74	parse_extended(struct parsed_partitions state, struct block_device bdev,
75	u32 first_sector, u32 first_size)
76	{
77	struct partition *p;
78	Sector sect;
79	unsigned char *data;
80	u32 this_sector, this_size;
81	int sector_size = bdev_hardsect_size(bdev) / 512;
82	int loopct = 0; /* number of links followed
83	without finding a data partition */
84	int i;
85
86	this_sector = first_sector;
87	this_size = first_size;
88
89	while (1) {
90	if (++loopct > 100)
91	return;
92	if (state->next == state->limit)
93	return;
94	data = read_dev_sector(bdev, this_sector, &sect);
95	if (!data)
96	return;
97
98	if (!msdos_magic_present(data + 510))
99	goto done;
100
101	p = (struct partition *) (data + 0x1be);
102
103	/*
104	* Usually, the first entry is the real data partition,
105	* the 2nd entry is the next extended partition, or empty,
106	* and the 3rd and 4th entries are unused.
107	* However, DRDOS sometimes has the extended partition as
108	* the first entry (when the data partition is empty),
109	* and OS/2 seems to use all four entries.
110	*/
111
112	/*
113	* First process the data partition(s)
114	*/
115	for (i=0; i<4; i++, p++) {
116	u32 offs, size, next;
1da177e4 LT	117	if (!NR_SECTS(p) \|\| is_extended_partition(p))
	118	continue;
	119
	120	/* Check the 3rd and 4th entries -
	121	these sometimes contain random garbage */
	122	offs = START_SECT(p)*sector_size;
	123	size = NR_SECTS(p)*sector_size;
	124	next = this_sector + offs;
	125	if (i >= 2) {
	126	if (offs + size > this_size)
	127	continue;
	128	if (next < first_sector)
	129	continue;
	130	if (next + size > first_sector + first_size)
	131	continue;
	132	}
	133
	134	put_partition(state, state->next, next, size);
	135	if (SYS_IND(p) == LINUX_RAID_PARTITION)
	136	state->parts[state->next].flags = 1;
	137	loopct = 0;
	138	if (++state->next == state->limit)
	139	goto done;
	140	}
	141	/*
	142	* Next, process the (first) extended partition, if present.
	143	* (So far, there seems to be no reason to make
	144	* parse_extended() recursive and allow a tree
	145	* of extended partitions.)
	146	* It should be a link to the next logical partition.
	147	*/
	148	p -= 4;
	149	for (i=0; i<4; i++, p++)
	150	if (NR_SECTS(p) && is_extended_partition(p))
	151	break;
	152	if (i == 4)
	153	goto done; /* nothing left to do */
	154
	155	this_sector = first_sector + START_SECT(p) * sector_size;
	156	this_size = NR_SECTS(p) * sector_size;
	157	put_dev_sector(sect);
	158	}
	159	done:
	160	put_dev_sector(sect);
	161	}
	162
	163	/* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
	164	indicates linux swap. Be careful before believing this is Solaris. */
	165
	166	static void
	167	parse_solaris_x86(struct parsed_partitions state, struct block_device bdev,
	168	u32 offset, u32 size, int origin)
	169	{
	170	#ifdef CONFIG_SOLARIS_X86_PARTITION
	171	Sector sect;
	172	struct solaris_x86_vtoc *v;
	173	int i;
	174
	175	v = (struct solaris_x86_vtoc *)read_dev_sector(bdev, offset+1, &sect);
	176	if (!v)
	177	return;
	178	if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) {
	179	put_dev_sector(sect);
	180	return;
181	}
182	printk(" %s%d: <solaris:", state->name, origin);
183	if (le32_to_cpu(v->v_version) != 1) {
184	printk(" cannot handle version %d vtoc>\n",
185	le32_to_cpu(v->v_version));
186	put_dev_sector(sect);
187	return;
188	}
189	for (i=0; i<SOLARIS_X86_NUMSLICE && state->next<state->limit; i++) {
190	struct solaris_x86_slice *s = &v->v_slice[i];
191	if (s->s_size == 0)
192	continue;
193	printk(" [s%d]", i);
194	/* solaris partitions are relative to current MS-DOS
195	* one; must add the offset of the current partition */
196	put_partition(state, state->next++,
197	le32_to_cpu(s->s_start)+offset,
198	le32_to_cpu(s->s_size));
199	}
200	put_dev_sector(sect);
201	printk(" >\n");
202	#endif
203	}
204
205	#if defined(CONFIG_BSD_DISKLABEL) \|\| defined(CONFIG_NEC98_PARTITION)
206	/*
207	* Create devices for BSD partitions listed in a disklabel, under a
208	* dos-like partition. See parse_extended() for more information.
209	*/
210	void
211	parse_bsd(struct parsed_partitions state, struct block_device bdev,
212	u32 offset, u32 size, int origin, char *flavour,
213	int max_partitions)
214	{
215	Sector sect;
216	struct bsd_disklabel *l;
217	struct bsd_partition *p;
218
219	l = (struct bsd_disklabel *)read_dev_sector(bdev, offset+1, &sect);
220	if (!l)
221	return;
222	if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) {
223	put_dev_sector(sect);
224	return;
225	}
226	printk(" %s%d: <%s:", state->name, origin, flavour);
227
228	if (le16_to_cpu(l->d_npartitions) < max_partitions)
229	max_partitions = le16_to_cpu(l->d_npartitions);
230	for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) {
231	u32 bsd_start, bsd_size;
232
233	if (state->next == state->limit)
234	break;
235	if (p->p_fstype == BSD_FS_UNUSED)
236	continue;
237	bsd_start = le32_to_cpu(p->p_offset);
238	bsd_size = le32_to_cpu(p->p_size);
239	if (offset == bsd_start && size == bsd_size)
240	/* full parent partition, we have it already */
241	continue;
242	if (offset > bsd_start \|\| offset+size < bsd_start+bsd_size) {
243	printk("bad subpartition - ignored\n");
244	continue;
245	}
246	put_partition(state, state->next++, bsd_start, bsd_size);
247	}
248	put_dev_sector(sect);
249	if (le16_to_cpu(l->d_npartitions) > max_partitions)
250	printk(" (ignored %d more)",
251	le16_to_cpu(l->d_npartitions) - max_partitions);
252	printk(" >\n");
253	}
254	#endif
255
256	static void
257	parse_freebsd(struct parsed_partitions state, struct block_device bdev,
258	u32 offset, u32 size, int origin)
259	{
260	#ifdef CONFIG_BSD_DISKLABEL
261	parse_bsd(state, bdev, offset, size, origin,
262	"bsd", BSD_MAXPARTITIONS);
263	#endif
264	}
265
266	static void
267	parse_netbsd(struct parsed_partitions state, struct block_device bdev,
268	u32 offset, u32 size, int origin)
269	{
270	#ifdef CONFIG_BSD_DISKLABEL
271	parse_bsd(state, bdev, offset, size, origin,
272	"netbsd", BSD_MAXPARTITIONS);
273	#endif
274	}
275
276	static void
277	parse_openbsd(struct parsed_partitions state, struct block_device bdev,
278	u32 offset, u32 size, int origin)
279	{
280	#ifdef CONFIG_BSD_DISKLABEL
281	parse_bsd(state, bdev, offset, size, origin,
282	"openbsd", OPENBSD_MAXPARTITIONS);
283	#endif
284	}
285
286	/*
287	* Create devices for Unixware partitions listed in a disklabel, under a
288	* dos-like partition. See parse_extended() for more information.
289	*/
290	static void
291	parse_unixware(struct parsed_partitions state, struct block_device bdev,
292	u32 offset, u32 size, int origin)
293	{
294	#ifdef CONFIG_UNIXWARE_DISKLABEL
295	Sector sect;
296	struct unixware_disklabel *l;
297	struct unixware_slice *p;
298
299	l = (struct unixware_disklabel *)read_dev_sector(bdev, offset+29, &sect);
300	if (!l)
301	return;
302	if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC \|\|
303	le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
304	put_dev_sector(sect);
305	return;
306	}
307	printk(" %s%d: <unixware:", state->name, origin);
308	p = &l->vtoc.v_slice[1];
309	/* I omit the 0th slice as it is the same as whole disk. */
310	while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
311	if (state->next == state->limit)
312	break;
313
314	if (p->s_label != UNIXWARE_FS_UNUSED)
315	put_partition(state, state->next++,
316	START_SECT(p), NR_SECTS(p));
317	p++;
318	}
319	put_dev_sector(sect);
320	printk(" >\n");
321	#endif
322	}
323
324	/*
325	* Minix 2.0.0/2.0.2 subpartition support.
326	* Anand Krishnamurthy <anandk@wiproge.med.ge.com>
327	* Rajeev V. Pillai <rajeevvp@yahoo.com>
328	*/
329	static void
330	parse_minix(struct parsed_partitions state, struct block_device bdev,
331	u32 offset, u32 size, int origin)
332	{
333	#ifdef CONFIG_MINIX_SUBPARTITION
334	Sector sect;
335	unsigned char *data;
336	struct partition *p;
337	int i;
338
339	data = read_dev_sector(bdev, offset, &sect);
340	if (!data)
341	return;
342
343	p = (struct partition *)(data + 0x1be);
344
345	/* The first sector of a Minix partition can have either
346	* a secondary MBR describing its subpartitions, or
347	* the normal boot sector. */
348	if (msdos_magic_present (data + 510) &&
349	SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
350
351	printk(" %s%d: <minix:", state->name, origin);
352	for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) {
353	if (state->next == state->limit)
354	break;
355	/* add each partition in use */
356	if (SYS_IND(p) == MINIX_PARTITION)
357	put_partition(state, state->next++,
358	START_SECT(p), NR_SECTS(p));
359	}
360	printk(" >\n");
361	}
362	put_dev_sector(sect);
363	#endif /* CONFIG_MINIX_SUBPARTITION */
364	}
365
366	static struct {
367	unsigned char id;
368	void (parse)(struct parsed_partitions , struct block_device *,
369	u32, u32, int);
370	} subtypes[] = {
371	{FREEBSD_PARTITION, parse_freebsd},
372	{NETBSD_PARTITION, parse_netbsd},
373	{OPENBSD_PARTITION, parse_openbsd},
374	{MINIX_PARTITION, parse_minix},
375	{UNIXWARE_PARTITION, parse_unixware},
376	{SOLARIS_X86_PARTITION, parse_solaris_x86},
377	{NEW_SOLARIS_X86_PARTITION, parse_solaris_x86},
378	{0, NULL},
379	};
380
381	int msdos_partition(struct parsed_partitions state, struct block_device bdev)
382	{
383	int sector_size = bdev_hardsect_size(bdev) / 512;
384	Sector sect;
385	unsigned char *data;
386	struct partition *p;
387	int slot;
388
389	data = read_dev_sector(bdev, 0, &sect);
390	if (!data)
391	return -1;
392	if (!msdos_magic_present(data + 510)) {
393	put_dev_sector(sect);
394	return 0;
395	}
396
397	/*
398	* Now that the 55aa signature is present, this is probably
399	* either the boot sector of a FAT filesystem or a DOS-type
400	* partition table. Reject this in case the boot indicator
401	* is not 0 or 0x80.
402	*/
403	p = (struct partition *) (data + 0x1be);
404	for (slot = 1; slot <= 4; slot++, p++) {
405	if (p->boot_ind != 0 && p->boot_ind != 0x80) {
406	put_dev_sector(sect);
407	return 0;
408	}
409	}
410
411	#ifdef CONFIG_EFI_PARTITION
412	p = (struct partition *) (data + 0x1be);
413	for (slot = 1 ; slot <= 4 ; slot++, p++) {
414	/* If this is an EFI GPT disk, msdos should ignore it. */
415	if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
416	put_dev_sector(sect);
417	return 0;
418	}
419	}
420	#endif
421	p = (struct partition *) (data + 0x1be);
422
423	/*
424	* Look for partitions in two passes:
425	* First find the primary and DOS-type extended partitions.
426	* On the second pass look inside *BSD, Unixware and Solaris partitions.
427	*/
428
429	state->next = 5;
430	for (slot = 1 ; slot <= 4 ; slot++, p++) {
431	u32 start = START_SECT(p)*sector_size;
432	u32 size = NR_SECTS(p)*sector_size;
1da177e4 LT	433	if (!size)
	434	continue;
	435	if (is_extended_partition(p)) {
	436	/* prevent someone doing mkfs or mkswap on an
	437	extended partition, but leave room for LILO */
	438	put_partition(state, slot, start, size == 1 ? 1 : 2);
	439	printk(" <");
	440	parse_extended(state, bdev, start, size);
	441	printk(" >");
	442	continue;
	443	}
	444	put_partition(state, slot, start, size);
	445	if (SYS_IND(p) == LINUX_RAID_PARTITION)
	446	state->parts[slot].flags = 1;
	447	if (SYS_IND(p) == DM6_PARTITION)
	448	printk("[DM]");
	449	if (SYS_IND(p) == EZD_PARTITION)
	450	printk("[EZD]");
	451	}
	452
	453	printk("\n");
	454
	455	/* second pass - output for each on a separate line */
	456	p = (struct partition *) (0x1be + data);
	457	for (slot = 1 ; slot <= 4 ; slot++, p++) {
	458	unsigned char id = SYS_IND(p);
	459	int n;
	460
	461	if (!NR_SECTS(p))
	462	continue;
	463
	464	for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++)
	465	;
	466
	467	if (!subtypes[n].parse)
	468	continue;
	469	subtypes[n].parse(state, bdev, START_SECT(p)*sector_size,
	470	NR_SECTS(p)*sector_size, slot);
	471	}
	472	put_dev_sector(sect);
	473	return 1;
	474	}