/* * Minix 2.0.0/2.0.2 subpartition support. * Anand Krishnamurthy <*****@*****.**> * Rajeev V. Pillai <*****@*****.**> */ 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, §); 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 */ }
int msdos_partition(struct parsed_partitions *state, struct block_device *bdev) { int sector_size = bdev_hardsect_size(bdev) / 512; Sector sect; unsigned char *data; struct partition *p; int slot; data = read_dev_sector(bdev, 0, §); if (!data) return -1; if (!msdos_magic_present(data + 510)) { put_dev_sector(sect); return 0; } if (aix_magic_present(data, bdev)) { put_dev_sector(sect); printk( " [AIX]"); return 0; } /* * Now that the 55aa signature is present, this is probably * either the boot sector of a FAT filesystem or a DOS-type * partition table. Reject this in case the boot indicator * is not 0 or 0x80. */ p = (struct partition *) (data + 0x1be); for (slot = 1; slot <= 4; slot++, p++) { if (p->boot_ind != 0 && p->boot_ind != 0x80) { put_dev_sector(sect); return 0; } } #ifdef CONFIG_EFI_PARTITION p = (struct partition *) (data + 0x1be); for (slot = 1 ; slot <= 4 ; slot++, p++) { /* If this is an EFI GPT disk, msdos should ignore it. */ if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) { put_dev_sector(sect); return 0; } } #endif p = (struct partition *) (data + 0x1be); /* * Look for partitions in two passes: * First find the primary and DOS-type extended partitions. * On the second pass look inside *BSD, Unixware and Solaris partitions. */ state->next = 5; for (slot = 1 ; slot <= 4 ; slot++, p++) { u32 start = START_SECT(p)*sector_size; u32 size = NR_SECTS(p)*sector_size; if (!size) continue; if (is_extended_partition(p)) { /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ put_partition(state, slot, start, size == 1 ? 1 : 2); printk(" <"); parse_extended(state, bdev, start, size); printk(" >"); continue; } put_partition(state, slot, start, size); if (SYS_IND(p) == LINUX_RAID_PARTITION) state->parts[slot].flags = 1; if (SYS_IND(p) == DM6_PARTITION) printk("[DM]"); if (SYS_IND(p) == EZD_PARTITION) printk("[EZD]"); } printk("\n"); /* second pass - output for each on a separate line */ p = (struct partition *) (0x1be + data); for (slot = 1 ; slot <= 4 ; slot++, p++) { unsigned char id = SYS_IND(p); int n; if (!NR_SECTS(p)) continue; for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) ; if (!subtypes[n].parse) continue; subtypes[n].parse(state, bdev, START_SECT(p)*sector_size, NR_SECTS(p)*sector_size, slot); } put_dev_sector(sect); return 1; }
static void 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, §); 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); }
static void extended_partition(struct gendisk *hd, kdev_t dev) { struct buffer_head *bh; struct partition *p; unsigned long first_sector, first_size, this_sector, this_size; int mask = (1 << hd->minor_shift) - 1; int sector_size = sector_partition_scale(dev); int i; first_sector = hd->part[MINOR(dev)].start_sect; first_size = hd->part[MINOR(dev)].nr_sects; this_sector = first_sector; while (1) { if ((current_minor & mask) == 0) return; if (!(bh = bread(dev,0,get_ptable_blocksize(dev)))) return; /* * This block is from a device that we're about to stomp on. * So make sure nobody thinks this block is usable. */ bh->b_state = 0; if ((*(__u16 *) (bh->b_data+510)) != cpu_to_le16(MSDOS_LABEL_MAGIC)) goto done; p = (struct partition *) (0x1BE + bh->b_data); this_size = hd->part[MINOR(dev)].nr_sects; /* * Usually, the first entry is the real data partition, * the 2nd entry is the next extended partition, or empty, * and the 3rd and 4th entries are unused. * However, DRDOS sometimes has the extended partition as * the first entry (when the data partition is empty), * and OS/2 seems to use all four entries. */ /* * First process the data partition(s) */ for (i=0; i<4; i++, p++) { if (!NR_SECTS(p) || is_extended_partition(p)) continue; /* Check the 3rd and 4th entries - these sometimes contain random garbage */ if (i >= 2 && START_SECT(p) + NR_SECTS(p) > this_size && (this_sector + START_SECT(p) < first_sector || this_sector + START_SECT(p) + NR_SECTS(p) > first_sector + first_size)) continue; add_gd_partition(hd, current_minor, this_sector+START_SECT(p)*sector_size, NR_SECTS(p)*sector_size, ptype(SYS_IND(p))); hd->part[current_minor].sys_ind = SYS_IND(p); // Hijack current_minor++; if ((current_minor & mask) == 0) goto done; } /* * Next, process the (first) extended partition, if present. * (So far, there seems to be no reason to make * extended_partition() recursive and allow a tree * of extended partitions.) * It should be a link to the next logical partition. * Create a minor for this just long enough to get the next * partition table. The minor will be reused for the next * data partition. */ p -= 4; for (i=0; i<4; i++, p++) if(NR_SECTS(p) && is_extended_partition(p)) break; if (i == 4) goto done; /* nothing left to do */ hd->part[current_minor].nr_sects = NR_SECTS(p) * sector_size; /* JSt */ hd->part[current_minor].start_sect = first_sector + START_SECT(p) * sector_size; this_sector = first_sector + START_SECT(p) * sector_size; dev = MKDEV(hd->major, current_minor); brelse(bh); } done: brelse(bh); }
static void tegra_msdos_parse_extended(struct parsed_partitions *state, struct block_device *bdev, u64 mbr_offset, u64 first_sector, u64 first_size) { struct partition *p; Sector sect; unsigned char *data; u64 this_sector, this_size; int sector_size = bdev_logical_block_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 > 2) { printk(KERN_INFO "tegra_msdos_parse_extended: loopcnt>2. exit\n"); return; } printk(KERN_INFO "tegra_msdos_parse_extended: read part sector, start=%llu+%llu size=%llu\n", mbr_offset, this_sector, this_size); data = read_dev_sector(bdev, mbr_offset+this_sector, §); if (!data) { printk(KERN_INFO "tegra_msdos_parse_extended: read error. exit\n"); return; } if (!msdos_magic_present(data + 510)) { printk(KERN_INFO "tegra_msdos_parse_extended: no msdos magic. exit\n"); goto done; } p = (struct partition *) (data + 0x1be); /* * First process the data partition(s) */ for (i=0; i<4; i++, p++) { u64 offs, size, next; if (!NR_SECTS(p) || is_extended_partition(p)) continue; 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; } printk(KERN_INFO "tegra_msdos_parse_extended: put_partition %d start=%llu+%llu size=%llu\n", state->next, mbr_offset, next, size); put_partition(state, state->next++, mbr_offset+next, size); loopct = 0; } printk(KERN_INFO "tegra_msdos_parse_extended: done with this sector\n"); p -= 4; for (i=0; i<4; i++, p++) if (NR_SECTS(p) && is_extended_partition(p)) { printk(KERN_INFO "tegra_msdos_parse_extended: extended part slot %d\n", i+1); 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: printk(KERN_INFO "tegra_msdos_parse_extended: done\n"); put_dev_sector(sect); }
static int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector) { int i, minor = current_minor; struct buffer_head *bh; struct partition *p; unsigned char *data; int mask = (1 << hd->minor_shift) - 1; #ifdef CONFIG_BLK_DEV_IDE int tested_for_xlate = 0; read_mbr: #endif if (!(bh = bread(dev,0,1024))) { printk(" unable to read partition table\n"); return -1; } data = bh->b_data; /* In some cases we modify the geometry */ /* of the drive (below), so ensure that */ /* nobody else tries to re-use this data. */ bh->b_state = 0; #ifdef __powerpc__ if (*(unsigned short *) (bh->b_data+510) == 0x55AA) { /* Little-endian partition table - adjust in place */ p = (struct partition *) (0x1BE + bh->b_data); for (i=1 ; i<=4 ; i++,p++) { if (!p->nr_sects) continue; p->start_sect = _LE_to_BE_long(p->start_sect); p->nr_sects = _LE_to_BE_long(p->nr_sects); } *(unsigned short *) (bh->b_data+510) = 0xAA55; } #endif #ifdef CONFIG_BLK_DEV_IDE check_table: #endif if (*(unsigned short *) (0x1fe + data) != 0xAA55) { brelse(bh); return 0; } p = (struct partition *) (0x1be + data); #ifdef CONFIG_BLK_DEV_IDE if (!tested_for_xlate++) { /* Do this only once per disk */ /* * Look for various forms of IDE disk geometry translation */ extern int ide_xlate_1024(kdev_t, int, const char *); unsigned int sig = *(unsigned short *)(data + 2); if (SYS_IND(p) == EZD_PARTITION) { /* * The remainder of the disk must be accessed using * a translated geometry that reduces the number of * apparent cylinders to less than 1024 if possible. * * ide_xlate_1024() will take care of the necessary * adjustments to fool fdisk/LILO and partition check. */ if (ide_xlate_1024(dev, -1, " [EZD]")) { data += 512; goto check_table; } } else if (SYS_IND(p) == DM6_PARTITION) { /* * Everything on the disk is offset by 63 sectors, * including a "new" MBR with its own partition table, * and the remainder of the disk must be accessed using * a translated geometry that reduces the number of * apparent cylinders to less than 1024 if possible. * * ide_xlate_1024() will take care of the necessary * adjustments to fool fdisk/LILO and partition check. */ if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) { brelse(bh); goto read_mbr; /* start over with new MBR */ } } else if (sig <= 0x1ae && *(unsigned short *)(data + sig) == 0x55AA && (1 & *(unsigned char *)(data + sig + 2)) ) { /* * DM6 signature in MBR, courtesy of OnTrack */ (void) ide_xlate_1024 (dev, 0, " [DM6:MBR]"); } else if (SYS_IND(p) == DM6_AUX1PARTITION || SYS_IND(p) == DM6_AUX3PARTITION) { /* * DM6 on other than the first (boot) drive */ (void) ide_xlate_1024(dev, 0, " [DM6:AUX]"); } else { /* * Examine the partition table for common translations. * This is necessary for drives for situations where * the translated geometry is unavailable from the BIOS. */ for (i = 0; i < 4 ; i++) { struct partition *q = &p[i]; if (NR_SECTS(q) && (q->sector & 63) == 1 && (q->end_sector & 63) == 63) { unsigned int heads = q->end_head + 1; if (heads == 32 || heads == 64 || heads == 128 || heads == 255) { (void) ide_xlate_1024(dev, heads, " [PTBL]"); break; } } } } } #endif /* CONFIG_BLK_DEV_IDE */ current_minor += 4; /* first "extra" minor (for extended partitions) */ for (i=1 ; i<=4 ; minor++,i++,p++) { if (!NR_SECTS(p)) continue; add_partition(hd, minor, first_sector+START_SECT(p), NR_SECTS(p)); if (is_extended_partition(p)) { printk(" <"); /* * If we are rereading the partition table, we need * to set the size of the partition so that we will * be able to bread the block containing the extended * partition info. */ hd->sizes[minor] = hd->part[minor].nr_sects >> (BLOCK_SIZE_BITS - 9); extended_partition(hd, MKDEV(hd->major, minor)); printk(" >"); /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ if (hd->part[minor].nr_sects > 2) hd->part[minor].nr_sects = 2; } #ifdef CONFIG_BSD_DISKLABEL if (SYS_IND(p) == BSD_PARTITION) { printk(" <"); bsd_disklabel_partition(hd, MKDEV(hd->major, minor)); printk(" >"); } #endif } /* * Check for old-style Disk Manager partition table */ if (*(unsigned short *) (data+0xfc) == 0x55AA) { p = (struct partition *) (0x1be + data); for (i = 4 ; i < 16 ; i++, current_minor++) { p--; if ((current_minor & mask) == 0) break; if (!(START_SECT(p) && NR_SECTS(p))) continue; add_partition(hd, current_minor, START_SECT(p), NR_SECTS(p)); } } printk("\n"); brelse(bh); return 1; }
int msdos_partition(struct gendisk *hd, kdev_t dev, unsigned long first_sector, int first_part_minor) { int i, minor = current_minor = first_part_minor; struct buffer_head *bh; struct partition *p; unsigned char *data; int mask = (1 << hd->minor_shift) - 1; int sector_size = sector_partition_scale(dev); #ifdef CONFIG_BSD_DISKLABEL /* no bsd disklabel as a default */ kdev_t bsd_kdev = 0; int bsd_maxpart = BSD_MAXPARTITIONS; #endif #ifdef CONFIG_BLK_DEV_IDE int tested_for_xlate = 0; read_mbr: #endif if (!(bh = bread(dev,0,get_ptable_blocksize(dev)))) { printk(" unable to read partition table\n"); return -1; } data = bh->b_data; /* In some cases we modify the geometry */ /* of the drive (below), so ensure that */ /* nobody else tries to re-use this data. */ bh->b_state = 0; #ifdef CONFIG_BLK_DEV_IDE check_table: #endif if (*(unsigned short *) (0x1fe + data) != cpu_to_le16(MSDOS_LABEL_MAGIC)) { brelse(bh); return 0; } p = (struct partition *) (0x1be + data); #ifdef CONFIG_BLK_DEV_IDE if (!tested_for_xlate++) { /* Do this only once per disk */ /* * Look for various forms of IDE disk geometry translation */ extern int ide_xlate_1024(kdev_t, int, const char *); unsigned int sig = le16_to_cpu(*(unsigned short *)(data + 2)); if (SYS_IND(p) == EZD_PARTITION) { /* * The remainder of the disk must be accessed using * a translated geometry that reduces the number of * apparent cylinders to less than 1024 if possible. * * ide_xlate_1024() will take care of the necessary * adjustments to fool fdisk/LILO and partition check. */ if (ide_xlate_1024(dev, -1, " [EZD]")) { data += 512; goto check_table; } } else if (SYS_IND(p) == DM6_PARTITION) { /* * Everything on the disk is offset by 63 sectors, * including a "new" MBR with its own partition table, * and the remainder of the disk must be accessed using * a translated geometry that reduces the number of * apparent cylinders to less than 1024 if possible. * * ide_xlate_1024() will take care of the necessary * adjustments to fool fdisk/LILO and partition check. */ if (ide_xlate_1024(dev, 1, " [DM6:DDO]")) { brelse(bh); goto read_mbr; /* start over with new MBR */ } } else if (sig <= 0x1ae && *(unsigned short *)(data + sig) == cpu_to_le16(0x55AA) && (1 & *(unsigned char *)(data + sig + 2))) { /* DM6 signature in MBR, courtesy of OnTrack */ (void) ide_xlate_1024 (dev, 0, " [DM6:MBR]"); } else if (SYS_IND(p) == DM6_AUX1PARTITION || SYS_IND(p) == DM6_AUX3PARTITION) { /* * DM6 on other than the first (boot) drive */ (void) ide_xlate_1024(dev, 0, " [DM6:AUX]"); } else { /* * Examine the partition table for common translations. * This is useful for drives in situations where the * translated geometry is unavailable from the BIOS. */ for (i = 0; i < 4; i++) { struct partition *q = &p[i]; if (NR_SECTS(q) && (q->sector & 63) == 1 && (q->end_sector & 63) == 63) { unsigned int heads = q->end_head + 1; if (heads == 32 || heads == 64 || heads == 128 || heads == 240 || heads == 255) { (void) ide_xlate_1024(dev, heads, " [PTBL]"); break; } } } } } #endif /* CONFIG_BLK_DEV_IDE */ current_minor += 4; /* first "extra" minor (for extended partitions) */ for (i=1 ; i<=4 ; minor++,i++,p++) { if (!NR_SECTS(p)) continue; add_gd_partition(hd, minor, first_sector+START_SECT(p)*sector_size, NR_SECTS(p)*sector_size, ptype(SYS_IND(p))); hd->part[minor].sys_ind = SYS_IND(p); // Hijack if (is_extended_partition(p)) { printk(" <"); /* * If we are rereading the partition table, we need * to set the size of the partition so that we will * be able to bread the block containing the extended * partition info. */ hd->sizes[minor] = hd->part[minor].nr_sects >> (BLOCK_SIZE_BITS - 9); extended_partition(hd, MKDEV(hd->major, minor)); printk(" >"); /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ if (hd->part[minor].nr_sects > 2) hd->part[minor].nr_sects = 2; } #ifdef CONFIG_BSD_DISKLABEL /* tag first disklabel for late recognition */ if (SYS_IND(p) == BSD_PARTITION || SYS_IND(p) == NETBSD_PARTITION) { printk("!"); if (!bsd_kdev) bsd_kdev = MKDEV(hd->major, minor); } else if (SYS_IND(p) == OPENBSD_PARTITION) { printk("!"); if (!bsd_kdev) { bsd_kdev = MKDEV(hd->major, minor); bsd_maxpart = OPENBSD_MAXPARTITIONS; } } #endif #ifdef CONFIG_UNIXWARE_DISKLABEL if (SYS_IND(p) == UNIXWARE_PARTITION) unixware_partition(hd, MKDEV(hd->major, minor)); #endif #ifdef CONFIG_SOLARIS_X86_PARTITION /* [email protected]: Solaris has a nasty indicator: 0x82 * which also means linux swap. For that reason, all * of the prints are done inside the * solaris_x86_partition routine */ if(SYS_IND(p) == SOLARIS_X86_PARTITION) { solaris_x86_partition(hd, MKDEV(hd->major, minor), first_sector+START_SECT(p)); } #endif } #ifdef CONFIG_BSD_DISKLABEL if (bsd_kdev) { printk(" <"); bsd_disklabel_partition(hd, bsd_kdev, bsd_maxpart); printk(" >"); } #endif /* * Check for old-style Disk Manager partition table */ if (*(unsigned short *) (data+0xfc) == cpu_to_le16(MSDOS_LABEL_MAGIC)) { p = (struct partition *) (0x1be + data); for (i = 4 ; i < 16 ; i++, current_minor++) { p--; if ((current_minor & mask) == 0) break; if (!(START_SECT(p) && NR_SECTS(p))) continue; add_gd_partition(hd, current_minor, START_SECT(p), NR_SECTS(p), 0); } } printk("\n"); brelse(bh); return 1; }
int msdos_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor) { int i, minor = first_part_minor; Sector sect; struct partition *p; unsigned char *data; int mask = (1 << hd->minor_shift) - 1; int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512; int current_minor = first_part_minor; int err; err = handle_ide_mess(bdev); if (err <= 0) return err; data = read_dev_sector(bdev, 0, §); if (!data) return -1; if (!msdos_magic_present(data + 510)) { put_dev_sector(sect); return 0; } p = (struct partition *) (data + 0x1be); /* * Look for partitions in two passes: * First find the primary and DOS-type extended partitions. * On the second pass look inside *BSD, Unixware and Solaris partitions. */ current_minor += 4; for (i=1 ; i<=4 ; minor++,i++,p++) { if (!NR_SECTS(p)) continue; add_gd_partition(hd, minor, first_sector+START_SECT(p)*sector_size, NR_SECTS(p)*sector_size); #if CONFIG_BLK_DEV_MD if (SYS_IND(p) == LINUX_RAID_PARTITION) { md_autodetect_dev(MKDEV(hd->major,minor)); } #endif if (is_extended_partition(p)) { unsigned long size = hd->part[minor].nr_sects; printk(" <"); /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ if (size > 2) hd->part[minor].nr_sects = 2; extended_partition(hd, bdev, minor, size, ¤t_minor); printk(" >"); } } /* * Check for old-style Disk Manager partition table */ if (msdos_magic_present(data + 0xfc)) { p = (struct partition *) (0x1be + data); for (i = 4 ; i < 16 ; i++, current_minor++) { p--; if ((current_minor & mask) == 0) break; if (!(START_SECT(p) && NR_SECTS(p))) continue; add_gd_partition(hd, current_minor, START_SECT(p), NR_SECTS(p)); } } printk("\n"); /* second pass - output for each on a separate line */ minor -= 4; p = (struct partition *) (0x1be + data); for (i=1 ; i<=4 ; minor++,i++,p++) { unsigned char id = SYS_IND(p); int n; if (!NR_SECTS(p)) continue; for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) ; if (subtypes[n].parse) subtypes[n].parse(hd, bdev, minor, ¤t_minor); } put_dev_sector(sect); return 1; }
/* * Look for various forms of IDE disk geometry translation */ static int handle_ide_mess(struct block_device *bdev) { #ifdef CONFIG_BLK_DEV_IDE Sector sect; unsigned char *data; kdev_t dev = to_kdev_t(bdev->bd_dev); unsigned int sig; int heads = 0; struct partition *p; int i; /* * The i386 partition handling programs very often * make partitions end on cylinder boundaries. * There is no need to do so, and Linux fdisk doesnt always * do this, and Windows NT on Alpha doesnt do this either, * but still, this helps to guess #heads. */ data = read_dev_sector(bdev, 0, §); if (!data) return -1; if (!msdos_magic_present(data + 510)) { put_dev_sector(sect); return 0; } sig = le16_to_cpu(*(unsigned short *)(data + 2)); p = (struct partition *) (data + 0x1be); for (i = 0; i < 4; i++) { struct partition *q = &p[i]; if (NR_SECTS(q)) { if ((q->sector & 63) == 1 && (q->end_sector & 63) == 63) heads = q->end_head + 1; break; } } if (SYS_IND(p) == EZD_PARTITION) { /* * Accesses to sector 0 must go to sector 1 instead. */ if (ide_xlate_1024(dev, -1, heads, " [EZD]")) goto reread; } else if (SYS_IND(p) == DM6_PARTITION) { /* * Everything on the disk is offset by 63 sectors, * including a "new" MBR with its own partition table. */ if (ide_xlate_1024(dev, 1, heads, " [DM6:DDO]")) goto reread; } else if (sig <= 0x1ae && data[sig] == 0xAA && data[sig+1] == 0x55 && (data[sig+2] & 1)) { /* DM6 signature in MBR, courtesy of OnTrack */ (void) ide_xlate_1024 (dev, 0, heads, " [DM6:MBR]"); } else if (SYS_IND(p) == DM6_AUX1PARTITION || SYS_IND(p) == DM6_AUX3PARTITION) { /* * DM6 on other than the first (boot) drive */ (void) ide_xlate_1024(dev, 0, heads, " [DM6:AUX]"); } else { (void) ide_xlate_1024(dev, 2, heads, " [PTBL]"); } put_dev_sector(sect); return 1; reread: put_dev_sector(sect); /* Flush the cache */ invalidate_bdev(bdev, 1); truncate_inode_pages(bdev->bd_inode->i_mapping, 0); #endif /* CONFIG_BLK_DEV_IDE */ return 1; }
static void extended_partition(struct gendisk *hd, struct block_device *bdev, int minor, unsigned long first_size, int *current_minor) { struct partition *p; Sector sect; unsigned char *data; unsigned long first_sector, this_sector, this_size; int mask = (1 << hd->minor_shift) - 1; int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512; int loopct = 0; /* number of links followed without finding a data partition */ int i; this_sector = first_sector = hd->part[minor].start_sect; this_size = first_size; while (1) { if (++loopct > 100) return; if ((*current_minor & mask) == 0) return; data = read_dev_sector(bdev, this_sector, §); if (!data) return; if (!msdos_magic_present(data + 510)) goto done; p = (struct partition *) (data + 0x1be); /* * Usually, the first entry is the real data partition, * the 2nd entry is the next extended partition, or empty, * and the 3rd and 4th entries are unused. * However, DRDOS sometimes has the extended partition as * the first entry (when the data partition is empty), * and OS/2 seems to use all four entries. */ /* * First process the data partition(s) */ for (i=0; i<4; i++, p++) { unsigned long offs, size, next; if (!NR_SECTS(p) || is_extended_partition(p)) continue; /* Check the 3rd and 4th entries - these sometimes contain random garbage */ offs = START_SECT(p)*sector_size; size = NR_SECTS(p)*sector_size; next = this_sector + offs; if (i >= 2) { if (offs + size > this_size) continue; if (next < first_sector) continue; if (next + size > first_sector + first_size) continue; } add_gd_partition(hd, *current_minor, next, size); #if CONFIG_BLK_DEV_MD if (SYS_IND(p) == LINUX_RAID_PARTITION) { md_autodetect_dev(MKDEV(hd->major,*current_minor)); } #endif (*current_minor)++; loopct = 0; if ((*current_minor & mask) == 0) goto done; } /* * Next, process the (first) extended partition, if present. * (So far, there seems to be no reason to make * extended_partition() recursive and allow a tree * of extended partitions.) * It should be a link to the next logical partition. * Create a minor for this just long enough to get the next * partition table. The minor will be reused for the next * data partition. */ p -= 4; for (i=0; i<4; i++, p++) if (NR_SECTS(p) && is_extended_partition(p)) break; if (i == 4) goto done; /* nothing left to do */ this_sector = first_sector + START_SECT(p) * sector_size; this_size = NR_SECTS(p) * sector_size; minor = *current_minor; put_dev_sector(sect); } done: put_dev_sector(sect); }
int msdos_partition(struct gendisk *hd, struct block_device *bdev, unsigned long first_sector, int first_part_minor) { int i, minor = first_part_minor; Sector sect; struct partition *p; unsigned char *data; int mask = (1 << hd->minor_shift) - 1; int sector_size = get_hardsect_size(to_kdev_t(bdev->bd_dev)) / 512; int current_minor = first_part_minor; int err; #ifdef CONFIG_IDE_IPOD int sector_mult = 1; #endif err = handle_ide_mess(bdev); if (err <= 0) return err; data = read_dev_sector(bdev, 0, §); if (!data) return -1; if (!msdos_magic_present(data + 510)) { put_dev_sector(sect); return 0; } p = (struct partition *) (data + 0x1be); #ifdef CONFIG_IDE_IPOD /* * Addition for iPods: check for actual filesystems to figure out the correct partition layout */ for (i=1 ; i<=4 ; i++,p++) { unsigned char *partdata; if (!NR_SECTS(p)) continue; if (SYS_IND(p) == 0xb) { partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*4, §); if (msdos_magic_present(partdata + 510)) sector_mult = 4; partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*2, §); if (msdos_magic_present(partdata + 510)) sector_mult = 2; partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size, §); if (msdos_magic_present(partdata + 510)) sector_mult = 1; } else if (SYS_IND(p) == 0x83) { partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*4+2, §); if (ext3_magic_present(partdata + 56)) sector_mult = 4; partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size*2+2, §); if (ext3_magic_present(partdata + 56)) sector_mult = 2; partdata = read_dev_sector(bdev, first_sector+START_SECT(p)*sector_size+2, §); if (ext3_magic_present(partdata + 56)) sector_mult = 1; } } printk("Experimental partition and filesystem detection code by Vincent Huisman ([email protected])\n"); printk("Partition sector size: %d\n", sector_mult); sector_size *= sector_mult; p = (struct partition *) (data + 0x1be); // Reinitialize, duh #endif /* * Look for partitions in two passes: * First find the primary and DOS-type extended partitions. * On the second pass look inside *BSD, Unixware and Solaris partitions. */ current_minor += 4; for (i=1 ; i<=4 ; minor++,i++,p++) { if (!NR_SECTS(p)) continue; add_gd_partition(hd, minor, first_sector+START_SECT(p)*sector_size, NR_SECTS(p)*sector_size); #if CONFIG_BLK_DEV_MD if (SYS_IND(p) == LINUX_RAID_PARTITION) { md_autodetect_dev(MKDEV(hd->major,minor)); } #endif if (is_extended_partition(p)) { unsigned long size = hd->part[minor].nr_sects; printk(" <"); /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ if (size > 2) hd->part[minor].nr_sects = 2; extended_partition(hd, bdev, minor, size, ¤t_minor); printk(" >"); } } /* * Check for old-style Disk Manager partition table */ if (msdos_magic_present(data + 0xfc)) { p = (struct partition *) (0x1be + data); for (i = 4 ; i < 16 ; i++, current_minor++) { p--; if ((current_minor & mask) == 0) break; if (!(START_SECT(p) && NR_SECTS(p))) continue; add_gd_partition(hd, current_minor, START_SECT(p), NR_SECTS(p)); } } printk("\n"); /* second pass - output for each on a separate line */ minor -= 4; p = (struct partition *) (0x1be + data); for (i=1 ; i<=4 ; minor++,i++,p++) { unsigned char id = SYS_IND(p); int n; if (!NR_SECTS(p)) continue; for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) ; if (subtypes[n].parse) subtypes[n].parse(hd, bdev, minor, ¤t_minor); } put_dev_sector(sect); return 1; }
int msdos_partition(struct parsed_partitions *state, struct block_device *bdev) { int sector_size = bdev_hardsect_size(bdev) / 512; Sector sect; unsigned char *data; struct partition *p; int slot; #ifdef HACK_PARTITION_TABLE_BOOT_IND int check_times = 0; #endif data = read_dev_sector(bdev, 0, §); if (!data) return -1; if (!msdos_magic_present(data + 510)) { put_dev_sector(sect); return 0; } /* * Now that the 55aa signature is present, this is probably * either the boot sector of a FAT filesystem or a DOS-type * partition table. Reject this in case the boot indicator * is not 0 or 0x80. */ p = (struct partition *) (data + 0x1be); for (slot = 1; slot <= 4; slot++, p++) { if (p->boot_ind != 0 && p->boot_ind != 0x80) { #ifdef HACK_PARTITION_TABLE_BOOT_IND // hack for boot_ind != 0 && boot_ind != 0x80 printk("\n[cfyeh-hack] %s(%d) partition->boot_ind = 0x%.2x (should be 0x0 or 0x80)\n", __func__, __LINE__, p->boot_ind); check_times++; #else put_dev_sector(sect); return 0; #endif } } #ifdef HACK_PARTITION_TABLE_BOOT_IND // hack for boot_ind != 0 && boot_ind != 0x80 if(check_times > 1) { printk("[cfyeh-hack] %s(%d) partition->boot_ind fail %d times !!!\n", __func__, __LINE__, check_times); put_dev_sector(sect); return 0; } #endif #ifdef CONFIG_EFI_PARTITION p = (struct partition *) (data + 0x1be); for (slot = 1 ; slot <= 4 ; slot++, p++) { /* If this is an EFI GPT disk, msdos should ignore it. */ if (SYS_IND(p) == EFI_PMBR_OSTYPE_EFI_GPT) { put_dev_sector(sect); return 0; } } #endif p = (struct partition *) (data + 0x1be); /* * Look for partitions in two passes: * First find the primary and DOS-type extended partitions. * On the second pass look inside *BSD, Unixware and Solaris partitions. */ state->next = 5; for (slot = 1 ; slot <= 4 ; slot++, p++) { u32 start = START_SECT(p)*sector_size; u32 size = NR_SECTS(p)*sector_size; if (!size) continue; if (is_extended_partition(p)) { // add to know which partition is a extended partition // by cfyeh 2007/11/13 + state->parts[slot].is_part_extended = 1; // by cfyeh 2007/11/13 - /* prevent someone doing mkfs or mkswap on an extended partition, but leave room for LILO */ put_partition(state, slot, start, size == 1 ? 1 : 2); printk(" <"); parse_extended(state, bdev, start, size); printk(" >"); continue; } put_partition(state, slot, start, size); if (SYS_IND(p) == LINUX_RAID_PARTITION) state->parts[slot].flags = 1; if (SYS_IND(p) == DM6_PARTITION) printk("[DM]"); if (SYS_IND(p) == EZD_PARTITION) printk("[EZD]"); } printk("\n"); /* second pass - output for each on a separate line */ p = (struct partition *) (0x1be + data); for (slot = 1 ; slot <= 4 ; slot++, p++) { unsigned char id = SYS_IND(p); int n; if (!NR_SECTS(p)) continue; for (n = 0; subtypes[n].parse && id != subtypes[n].id; n++) ; if (!subtypes[n].parse) continue; subtypes[n].parse(state, bdev, START_SECT(p)*sector_size, NR_SECTS(p)*sector_size, slot); } put_dev_sector(sect); return 1; }