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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c 
 kernel/block/partitions/msdos.c
....@@ -18,13 +18,18 @@
1818  *  Check partition table on IDE disks for common CHS translations
1919  *
2020  *  Re-organised Feb 1998 Russell King
21
+ *
22
+ *  BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
23
+ *  updated by Marc Espie <Marc.Espie@openbsd.org>
24
+ *
25
+ *  Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
26
+ *  and Krzysztof G. Baranowski <kgb@knm.org.pl>
2127  */
2228 #include <linux/msdos_fs.h>
29
+#include <linux/msdos_partition.h>
2330 
2431 #include "check.h"
25
-#include "msdos.h"
2632 #include "efi.h"
27
-#include "aix.h"
2833 
2934 /*
3035  * Many architectures don't like unaligned accesses, while
....@@ -33,23 +38,21 @@
3338  */
3439 #include <asm/unaligned.h>
3540 
36
-#define SYS_IND(p)	get_unaligned(&p->sys_ind)
37
-
38
-static inline sector_t nr_sects(struct partition *p)
41
+static inline sector_t nr_sects(struct msdos_partition *p)
3942 {
4043 	return (sector_t)get_unaligned_le32(&p->nr_sects);
4144 }
4245 
43
-static inline sector_t start_sect(struct partition *p)
46
+static inline sector_t start_sect(struct msdos_partition *p)
4447 {
4548 	return (sector_t)get_unaligned_le32(&p->start_sect);
4649 }
4750 
48
-static inline int is_extended_partition(struct partition *p)
51
+static inline int is_extended_partition(struct msdos_partition *p)
4952 {
50
-	return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
51
-		SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
52
-		SYS_IND(p) == LINUX_EXTENDED_PARTITION);
53
+	return (p->sys_ind == DOS_EXTENDED_PARTITION ||
54
+		p->sys_ind == WIN98_EXTENDED_PARTITION ||
55
+		p->sys_ind == LINUX_EXTENDED_PARTITION);
5356 }
5457 
5558 #define MSDOS_LABEL_MAGIC1	0x55
....@@ -68,7 +71,7 @@
6871 #define AIX_LABEL_MAGIC4	0xC1
6972 static int aix_magic_present(struct parsed_partitions *state, unsigned char *p)
7073 {
71
-	struct partition *pt = (struct partition *) (p + 0x1be);
74
+	struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be);
7275 	Sector sect;
7376 	unsigned char *d;
7477 	int slot, ret = 0;
....@@ -78,13 +81,19 @@
7881 		p[2] == AIX_LABEL_MAGIC3 &&
7982 		p[3] == AIX_LABEL_MAGIC4))
8083 		return 0;
81
-	/* Assume the partition table is valid if Linux partitions exists */
84
+
85
+	/*
86
+	 * Assume the partition table is valid if Linux partitions exists.
87
+	 * Note that old Solaris/x86 partitions use the same indicator as
88
+	 * Linux swap partitions, so we consider that a Linux partition as
89
+	 * well.
90
+	 */
8291 	for (slot = 1; slot <= 4; slot++, pt++) {
83
-		if (pt->sys_ind == LINUX_SWAP_PARTITION ||
84
-			pt->sys_ind == LINUX_RAID_PARTITION ||
85
-			pt->sys_ind == LINUX_DATA_PARTITION ||
86
-			pt->sys_ind == LINUX_LVM_PARTITION ||
87
-			is_extended_partition(pt))
92
+		if (pt->sys_ind == SOLARIS_X86_PARTITION ||
93
+		    pt->sys_ind == LINUX_RAID_PARTITION ||
94
+		    pt->sys_ind == LINUX_DATA_PARTITION ||
95
+		    pt->sys_ind == LINUX_LVM_PARTITION ||
96
+		    is_extended_partition(pt))
8897 			return 0;
8998 	}
9099 	d = read_part_sector(state, 7, &sect);
....@@ -122,7 +131,7 @@
122131 			   sector_t first_sector, sector_t first_size,
123132 			   u32 disksig)
124133 {
125
-	struct partition *p;
134
+	struct msdos_partition *p;
126135 	Sector sect;
127136 	unsigned char *data;
128137 	sector_t this_sector, this_size;
....@@ -146,7 +155,7 @@
146155 		if (!msdos_magic_present(data + 510))
147156 			goto done;
148157 
149
-		p = (struct partition *) (data + 0x1be);
158
+		p = (struct msdos_partition *) (data + 0x1be);
150159 
151160 		/*
152161 		 * Usually, the first entry is the real data partition,
....@@ -182,7 +191,7 @@
182191 
183192 			put_partition(state, state->next, next, size);
184193 			set_info(state, state->next, disksig);
185
-			if (SYS_IND(p) == LINUX_RAID_PARTITION)
194
+			if (p->sys_ind == LINUX_RAID_PARTITION)
186195 				state->parts[state->next].flags = ADDPART_FLAG_RAID;
187196 			loopct = 0;
188197 			if (++state->next == state->limit)
....@@ -209,6 +218,30 @@
209218 done:
210219 	put_dev_sector(sect);
211220 }
221
+
222
+#define SOLARIS_X86_NUMSLICE	16
223
+#define SOLARIS_X86_VTOC_SANE	(0x600DDEEEUL)
224
+
225
+struct solaris_x86_slice {
226
+	__le16 s_tag;		/* ID tag of partition */
227
+	__le16 s_flag;		/* permission flags */
228
+	__le32 s_start;		/* start sector no of partition */
229
+	__le32 s_size;		/* # of blocks in partition */
230
+};
231
+
232
+struct solaris_x86_vtoc {
233
+	unsigned int v_bootinfo[3];	/* info needed by mboot */
234
+	__le32 v_sanity;		/* to verify vtoc sanity */
235
+	__le32 v_version;		/* layout version */
236
+	char	v_volume[8];		/* volume name */
237
+	__le16	v_sectorsz;		/* sector size in bytes */
238
+	__le16	v_nparts;		/* number of partitions */
239
+	unsigned int v_reserved[10];	/* free space */
240
+	struct solaris_x86_slice
241
+		v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
242
+	unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp */
243
+	char	v_asciilabel[128];	/* for compatibility */
244
+};
212245 
213246 /* james@bpgc.com: Solaris has a nasty indicator: 0x82 which also
214247    indicates linux swap.  Be careful before believing this is Solaris. */
....@@ -264,6 +297,54 @@
264297 	strlcat(state->pp_buf, " >\n", PAGE_SIZE);
265298 #endif
266299 }
300
+
301
+/* check against BSD src/sys/sys/disklabel.h for consistency */
302
+#define BSD_DISKMAGIC	(0x82564557UL)	/* The disk magic number */
303
+#define BSD_MAXPARTITIONS	16
304
+#define OPENBSD_MAXPARTITIONS	16
305
+#define BSD_FS_UNUSED		0 /* disklabel unused partition entry ID */
306
+struct bsd_disklabel {
307
+	__le32	d_magic;		/* the magic number */
308
+	__s16	d_type;			/* drive type */
309
+	__s16	d_subtype;		/* controller/d_type specific */
310
+	char	d_typename[16];		/* type name, e.g. "eagle" */
311
+	char	d_packname[16];		/* pack identifier */
312
+	__u32	d_secsize;		/* # of bytes per sector */
313
+	__u32	d_nsectors;		/* # of data sectors per track */
314
+	__u32	d_ntracks;		/* # of tracks per cylinder */
315
+	__u32	d_ncylinders;		/* # of data cylinders per unit */
316
+	__u32	d_secpercyl;		/* # of data sectors per cylinder */
317
+	__u32	d_secperunit;		/* # of data sectors per unit */
318
+	__u16	d_sparespertrack;	/* # of spare sectors per track */
319
+	__u16	d_sparespercyl;		/* # of spare sectors per cylinder */
320
+	__u32	d_acylinders;		/* # of alt. cylinders per unit */
321
+	__u16	d_rpm;			/* rotational speed */
322
+	__u16	d_interleave;		/* hardware sector interleave */
323
+	__u16	d_trackskew;		/* sector 0 skew, per track */
324
+	__u16	d_cylskew;		/* sector 0 skew, per cylinder */
325
+	__u32	d_headswitch;		/* head switch time, usec */
326
+	__u32	d_trkseek;		/* track-to-track seek, usec */
327
+	__u32	d_flags;		/* generic flags */
328
+#define NDDATA 5
329
+	__u32	d_drivedata[NDDATA];	/* drive-type specific information */
330
+#define NSPARE 5
331
+	__u32	d_spare[NSPARE];	/* reserved for future use */
332
+	__le32	d_magic2;		/* the magic number (again) */
333
+	__le16	d_checksum;		/* xor of data incl. partitions */
334
+
335
+			/* filesystem and partition information: */
336
+	__le16	d_npartitions;		/* number of partitions in following */
337
+	__le32	d_bbsize;		/* size of boot area at sn0, bytes */
338
+	__le32	d_sbsize;		/* max size of fs superblock, bytes */
339
+	struct	bsd_partition {		/* the partition table */
340
+		__le32	p_size;		/* number of sectors in partition */
341
+		__le32	p_offset;	/* starting sector */
342
+		__le32	p_fsize;	/* filesystem basic fragment size */
343
+		__u8	p_fstype;	/* filesystem type, see below */
344
+		__u8	p_frag;		/* filesystem fragments per block */
345
+		__le16	p_cpg;		/* filesystem cylinders per group */
346
+	} d_partitions[BSD_MAXPARTITIONS];	/* actually may be more */
347
+};
267348 
268349 #if defined(CONFIG_BSD_DISKLABEL)
269350 /*
....@@ -349,6 +430,51 @@
349430 #endif
350431 }
351432 
433
+#define UNIXWARE_DISKMAGIC     (0xCA5E600DUL)	/* The disk magic number */
434
+#define UNIXWARE_DISKMAGIC2    (0x600DDEEEUL)	/* The slice table magic nr */
435
+#define UNIXWARE_NUMSLICE      16
436
+#define UNIXWARE_FS_UNUSED     0		/* Unused slice entry ID */
437
+
438
+struct unixware_slice {
439
+	__le16   s_label;	/* label */
440
+	__le16   s_flags;	/* permission flags */
441
+	__le32   start_sect;	/* starting sector */
442
+	__le32   nr_sects;	/* number of sectors in slice */
443
+};
444
+
445
+struct unixware_disklabel {
446
+	__le32	d_type;			/* drive type */
447
+	__le32	d_magic;		/* the magic number */
448
+	__le32	d_version;		/* version number */
449
+	char	d_serial[12];		/* serial number of the device */
450
+	__le32	d_ncylinders;		/* # of data cylinders per device */
451
+	__le32	d_ntracks;		/* # of tracks per cylinder */
452
+	__le32	d_nsectors;		/* # of data sectors per track */
453
+	__le32	d_secsize;		/* # of bytes per sector */
454
+	__le32	d_part_start;		/* # of first sector of this partition*/
455
+	__le32	d_unknown1[12];		/* ? */
456
+	__le32	d_alt_tbl;		/* byte offset of alternate table */
457
+	__le32	d_alt_len;		/* byte length of alternate table */
458
+	__le32	d_phys_cyl;		/* # of physical cylinders per device */
459
+	__le32	d_phys_trk;		/* # of physical tracks per cylinder */
460
+	__le32	d_phys_sec;		/* # of physical sectors per track */
461
+	__le32	d_phys_bytes;		/* # of physical bytes per sector */
462
+	__le32	d_unknown2;		/* ? */
463
+	__le32	d_unknown3;		/* ? */
464
+	__le32	d_pad[8];		/* pad */
465
+
466
+	struct unixware_vtoc {
467
+		__le32	v_magic;		/* the magic number */
468
+		__le32	v_version;		/* version number */
469
+		char	v_name[8];		/* volume name */
470
+		__le16	v_nslices;		/* # of slices */
471
+		__le16	v_unknown1;		/* ? */
472
+		__le32	v_reserved[10];		/* reserved */
473
+		struct unixware_slice
474
+			v_slice[UNIXWARE_NUMSLICE];	/* slice headers */
475
+	} vtoc;
476
+};  /* 408 */
477
+
352478 /*
353479  * Create devices for Unixware partitions listed in a disklabel, under a
354480  * dos-like partition. See parse_extended() for more information.
....@@ -392,6 +518,8 @@
392518 #endif
393519 }
394520 
521
+#define MINIX_NR_SUBPARTITIONS  4
522
+
395523 /*
396524  * Minix 2.0.0/2.0.2 subpartition support.
397525  * Anand Krishnamurthy <anandk@wiproge.med.ge.com>
....@@ -403,20 +531,20 @@
403531 #ifdef CONFIG_MINIX_SUBPARTITION
404532 	Sector sect;
405533 	unsigned char *data;
406
-	struct partition *p;
534
+	struct msdos_partition *p;
407535 	int i;
408536 
409537 	data = read_part_sector(state, offset, &sect);
410538 	if (!data)
411539 		return;
412540 
413
-	p = (struct partition *)(data + 0x1be);
541
+	p = (struct msdos_partition *)(data + 0x1be);
414542 
415543 	/* The first sector of a Minix partition can have either
416544 	 * a secondary MBR describing its subpartitions, or
417545 	 * the normal boot sector. */
418546 	if (msdos_magic_present(data + 510) &&
419
-	    SYS_IND(p) == MINIX_PARTITION) { /* subpartition table present */
547
+	    p->sys_ind == MINIX_PARTITION) { /* subpartition table present */
420548 		char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1];
421549 
422550 		snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin);
....@@ -425,7 +553,7 @@
425553 			if (state->next == state->limit)
426554 				break;
427555 			/* add each partition in use */
428
-			if (SYS_IND(p) == MINIX_PARTITION)
556
+			if (p->sys_ind == MINIX_PARTITION)
429557 				put_partition(state, state->next++,
430558 					      start_sect(p), nr_sects(p));
431559 		}
....@@ -454,7 +582,7 @@
454582 	sector_t sector_size = bdev_logical_block_size(state->bdev) / 512;
455583 	Sector sect;
456584 	unsigned char *data;
457
-	struct partition *p;
585
+	struct msdos_partition *p;
458586 	struct fat_boot_sector *fb;
459587 	int slot;
460588 	u32 disksig;
....@@ -488,7 +616,7 @@
488616 	 * partition table. Reject this in case the boot indicator
489617 	 * is not 0 or 0x80.
490618 	 */
491
-	p = (struct partition *) (data + 0x1be);
619
+	p = (struct msdos_partition *) (data + 0x1be);
492620 	for (slot = 1; slot <= 4; slot++, p++) {
493621 		if (p->boot_ind != 0 && p->boot_ind != 0x80) {
494622 			/*
....@@ -510,16 +638,16 @@
510638 	}
511639 
512640 #ifdef CONFIG_EFI_PARTITION
513
-	p = (struct partition *) (data + 0x1be);
641
+	p = (struct msdos_partition *) (data + 0x1be);
514642 	for (slot = 1 ; slot <= 4 ; slot++, p++) {
515643 		/* If this is an EFI GPT disk, msdos should ignore it. */
516
-		if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) {
644
+		if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) {
517645 			put_dev_sector(sect);
518646 			return 0;
519647 		}
520648 	}
521649 #endif
522
-	p = (struct partition *) (data + 0x1be);
650
+	p = (struct msdos_partition *) (data + 0x1be);
523651 
524652 	disksig = le32_to_cpup((__le32 *)(data + 0x1b8));
525653 
....@@ -555,20 +683,20 @@
555683 		}
556684 		put_partition(state, slot, start, size);
557685 		set_info(state, slot, disksig);
558
-		if (SYS_IND(p) == LINUX_RAID_PARTITION)
686
+		if (p->sys_ind == LINUX_RAID_PARTITION)
559687 			state->parts[slot].flags = ADDPART_FLAG_RAID;
560
-		if (SYS_IND(p) == DM6_PARTITION)
688
+		if (p->sys_ind == DM6_PARTITION)
561689 			strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
562
-		if (SYS_IND(p) == EZD_PARTITION)
690
+		if (p->sys_ind == EZD_PARTITION)
563691 			strlcat(state->pp_buf, "[EZD]", PAGE_SIZE);
564692 	}
565693 
566694 	strlcat(state->pp_buf, "\n", PAGE_SIZE);
567695 
568696 	/* second pass - output for each on a separate line */
569
-	p = (struct partition *) (0x1be + data);
697
+	p = (struct msdos_partition *) (0x1be + data);
570698 	for (slot = 1 ; slot <= 4 ; slot++, p++) {
571
-		unsigned char id = SYS_IND(p);
699
+		unsigned char id = p->sys_ind;
572700 		int n;
573701 
574702 		if (!nr_sects(p))