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717 lines
21 KiB
717 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* fs/partitions/msdos.c |
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* |
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* Code extracted from drivers/block/genhd.c |
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* Copyright (C) 1991-1998 Linus Torvalds |
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* |
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* Thanks to Branko Lankester, [email protected], who found a bug |
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* in the early extended-partition checks and added DM partitions |
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* |
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* Support for DiskManager v6.0x added by Mark Lord, |
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* with information provided by OnTrack. This now works for linux fdisk |
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* and LILO, as well as loadlin and bootln. Note that disks other than |
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* /dev/hda *must* have a "DOS" type 0x51 partition in the first slot (hda1). |
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* |
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* More flexible handling of extended partitions - aeb, 950831 |
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* |
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* Check partition table on IDE disks for common CHS translations |
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* |
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* Re-organised Feb 1998 Russell King |
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* |
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* BSD disklabel support by Yossi Gottlieb <[email protected]> |
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* updated by Marc Espie <[email protected]> |
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* |
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* Unixware slices support by Andrzej Krzysztofowicz <[email protected]> |
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* and Krzysztof G. Baranowski <[email protected]> |
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*/ |
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#include <linux/msdos_fs.h> |
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#include <linux/msdos_partition.h> |
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|
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#include "check.h" |
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#include "efi.h" |
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|
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/* |
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* Many architectures don't like unaligned accesses, while |
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* the nr_sects and start_sect partition table entries are |
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* at a 2 (mod 4) address. |
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*/ |
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#include <asm/unaligned.h> |
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|
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static inline sector_t nr_sects(struct msdos_partition *p) |
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{ |
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return (sector_t)get_unaligned_le32(&p->nr_sects); |
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} |
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|
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static inline sector_t start_sect(struct msdos_partition *p) |
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{ |
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return (sector_t)get_unaligned_le32(&p->start_sect); |
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} |
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|
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static inline int is_extended_partition(struct msdos_partition *p) |
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{ |
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return (p->sys_ind == DOS_EXTENDED_PARTITION || |
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p->sys_ind == WIN98_EXTENDED_PARTITION || |
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p->sys_ind == LINUX_EXTENDED_PARTITION); |
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} |
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|
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#define MSDOS_LABEL_MAGIC1 0x55 |
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#define MSDOS_LABEL_MAGIC2 0xAA |
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|
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static inline int |
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msdos_magic_present(unsigned char *p) |
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{ |
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return (p[0] == MSDOS_LABEL_MAGIC1 && p[1] == MSDOS_LABEL_MAGIC2); |
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} |
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|
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/* Value is EBCDIC 'IBMA' */ |
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#define AIX_LABEL_MAGIC1 0xC9 |
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#define AIX_LABEL_MAGIC2 0xC2 |
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#define AIX_LABEL_MAGIC3 0xD4 |
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#define AIX_LABEL_MAGIC4 0xC1 |
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static int aix_magic_present(struct parsed_partitions *state, unsigned char *p) |
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{ |
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struct msdos_partition *pt = (struct msdos_partition *) (p + 0x1be); |
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Sector sect; |
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unsigned char *d; |
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int slot, ret = 0; |
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|
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if (!(p[0] == AIX_LABEL_MAGIC1 && |
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p[1] == AIX_LABEL_MAGIC2 && |
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p[2] == AIX_LABEL_MAGIC3 && |
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p[3] == AIX_LABEL_MAGIC4)) |
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return 0; |
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|
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/* |
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* Assume the partition table is valid if Linux partitions exists. |
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* Note that old Solaris/x86 partitions use the same indicator as |
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* Linux swap partitions, so we consider that a Linux partition as |
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* well. |
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*/ |
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for (slot = 1; slot <= 4; slot++, pt++) { |
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if (pt->sys_ind == SOLARIS_X86_PARTITION || |
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pt->sys_ind == LINUX_RAID_PARTITION || |
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pt->sys_ind == LINUX_DATA_PARTITION || |
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pt->sys_ind == LINUX_LVM_PARTITION || |
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is_extended_partition(pt)) |
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return 0; |
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} |
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d = read_part_sector(state, 7, §); |
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if (d) { |
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if (d[0] == '_' && d[1] == 'L' && d[2] == 'V' && d[3] == 'M') |
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ret = 1; |
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put_dev_sector(sect); |
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} |
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return ret; |
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} |
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|
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static void set_info(struct parsed_partitions *state, int slot, |
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u32 disksig) |
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{ |
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struct partition_meta_info *info = &state->parts[slot].info; |
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|
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snprintf(info->uuid, sizeof(info->uuid), "%08x-%02x", disksig, |
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slot); |
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info->volname[0] = 0; |
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state->parts[slot].has_info = true; |
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} |
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|
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/* |
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* Create devices for each logical partition in an extended partition. |
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* The logical partitions form a linked list, with each entry being |
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* a partition table with two entries. The first entry |
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* is the real data partition (with a start relative to the partition |
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* table start). The second is a pointer to the next logical partition |
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* (with a start relative to the entire extended partition). |
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* We do not create a Linux partition for the partition tables, but |
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* only for the actual data partitions. |
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*/ |
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|
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static void parse_extended(struct parsed_partitions *state, |
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sector_t first_sector, sector_t first_size, |
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u32 disksig) |
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{ |
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struct msdos_partition *p; |
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Sector sect; |
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unsigned char *data; |
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sector_t this_sector, this_size; |
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sector_t sector_size; |
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int loopct = 0; /* number of links followed |
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without finding a data partition */ |
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int i; |
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sector_size = queue_logical_block_size(state->disk->queue) / 512; |
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this_sector = first_sector; |
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this_size = first_size; |
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|
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while (1) { |
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if (++loopct > 100) |
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return; |
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if (state->next == state->limit) |
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return; |
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data = read_part_sector(state, this_sector, §); |
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if (!data) |
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return; |
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if (!msdos_magic_present(data + 510)) |
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goto done; |
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p = (struct msdos_partition *) (data + 0x1be); |
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|
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/* |
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* Usually, the first entry is the real data partition, |
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* the 2nd entry is the next extended partition, or empty, |
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* and the 3rd and 4th entries are unused. |
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* However, DRDOS sometimes has the extended partition as |
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* the first entry (when the data partition is empty), |
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* and OS/2 seems to use all four entries. |
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*/ |
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|
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/* |
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* First process the data partition(s) |
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*/ |
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for (i = 0; i < 4; i++, p++) { |
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sector_t offs, size, next; |
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|
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if (!nr_sects(p) || is_extended_partition(p)) |
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continue; |
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|
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/* Check the 3rd and 4th entries - |
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these sometimes contain random garbage */ |
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offs = start_sect(p)*sector_size; |
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size = nr_sects(p)*sector_size; |
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next = this_sector + offs; |
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if (i >= 2) { |
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if (offs + size > this_size) |
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continue; |
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if (next < first_sector) |
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continue; |
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if (next + size > first_sector + first_size) |
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continue; |
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} |
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put_partition(state, state->next, next, size); |
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set_info(state, state->next, disksig); |
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if (p->sys_ind == LINUX_RAID_PARTITION) |
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state->parts[state->next].flags = ADDPART_FLAG_RAID; |
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loopct = 0; |
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if (++state->next == state->limit) |
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goto done; |
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} |
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/* |
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* Next, process the (first) extended partition, if present. |
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* (So far, there seems to be no reason to make |
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* parse_extended() recursive and allow a tree |
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* of extended partitions.) |
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* It should be a link to the next logical partition. |
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*/ |
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p -= 4; |
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for (i = 0; i < 4; i++, p++) |
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if (nr_sects(p) && is_extended_partition(p)) |
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break; |
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if (i == 4) |
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goto done; /* nothing left to do */ |
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this_sector = first_sector + start_sect(p) * sector_size; |
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this_size = nr_sects(p) * sector_size; |
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put_dev_sector(sect); |
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} |
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done: |
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put_dev_sector(sect); |
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} |
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#define SOLARIS_X86_NUMSLICE 16 |
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#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
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|
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struct solaris_x86_slice { |
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__le16 s_tag; /* ID tag of partition */ |
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__le16 s_flag; /* permission flags */ |
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__le32 s_start; /* start sector no of partition */ |
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__le32 s_size; /* # of blocks in partition */ |
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}; |
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|
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struct solaris_x86_vtoc { |
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unsigned int v_bootinfo[3]; /* info needed by mboot */ |
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__le32 v_sanity; /* to verify vtoc sanity */ |
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__le32 v_version; /* layout version */ |
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char v_volume[8]; /* volume name */ |
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__le16 v_sectorsz; /* sector size in bytes */ |
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__le16 v_nparts; /* number of partitions */ |
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unsigned int v_reserved[10]; /* free space */ |
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struct solaris_x86_slice |
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v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ |
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unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp */ |
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char v_asciilabel[128]; /* for compatibility */ |
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}; |
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/* [email protected]: Solaris has a nasty indicator: 0x82 which also |
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indicates linux swap. Be careful before believing this is Solaris. */ |
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static void parse_solaris_x86(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin) |
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{ |
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#ifdef CONFIG_SOLARIS_X86_PARTITION |
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Sector sect; |
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struct solaris_x86_vtoc *v; |
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int i; |
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short max_nparts; |
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v = read_part_sector(state, offset + 1, §); |
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if (!v) |
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return; |
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if (le32_to_cpu(v->v_sanity) != SOLARIS_X86_VTOC_SANE) { |
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put_dev_sector(sect); |
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return; |
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} |
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{ |
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char tmp[1 + BDEVNAME_SIZE + 10 + 11 + 1]; |
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|
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snprintf(tmp, sizeof(tmp), " %s%d: <solaris:", state->name, origin); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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} |
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if (le32_to_cpu(v->v_version) != 1) { |
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char tmp[64]; |
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snprintf(tmp, sizeof(tmp), " cannot handle version %d vtoc>\n", |
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le32_to_cpu(v->v_version)); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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put_dev_sector(sect); |
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return; |
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} |
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/* Ensure we can handle previous case of VTOC with 8 entries gracefully */ |
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max_nparts = le16_to_cpu(v->v_nparts) > 8 ? SOLARIS_X86_NUMSLICE : 8; |
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for (i = 0; i < max_nparts && state->next < state->limit; i++) { |
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struct solaris_x86_slice *s = &v->v_slice[i]; |
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char tmp[3 + 10 + 1 + 1]; |
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|
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if (s->s_size == 0) |
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continue; |
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snprintf(tmp, sizeof(tmp), " [s%d]", i); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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/* solaris partitions are relative to current MS-DOS |
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* one; must add the offset of the current partition */ |
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put_partition(state, state->next++, |
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le32_to_cpu(s->s_start)+offset, |
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le32_to_cpu(s->s_size)); |
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} |
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put_dev_sector(sect); |
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strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
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#endif |
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} |
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/* check against BSD src/sys/sys/disklabel.h for consistency */ |
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#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
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#define BSD_MAXPARTITIONS 16 |
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#define OPENBSD_MAXPARTITIONS 16 |
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#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
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struct bsd_disklabel { |
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__le32 d_magic; /* the magic number */ |
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__s16 d_type; /* drive type */ |
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__s16 d_subtype; /* controller/d_type specific */ |
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char d_typename[16]; /* type name, e.g. "eagle" */ |
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char d_packname[16]; /* pack identifier */ |
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__u32 d_secsize; /* # of bytes per sector */ |
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__u32 d_nsectors; /* # of data sectors per track */ |
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__u32 d_ntracks; /* # of tracks per cylinder */ |
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__u32 d_ncylinders; /* # of data cylinders per unit */ |
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__u32 d_secpercyl; /* # of data sectors per cylinder */ |
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__u32 d_secperunit; /* # of data sectors per unit */ |
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__u16 d_sparespertrack; /* # of spare sectors per track */ |
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__u16 d_sparespercyl; /* # of spare sectors per cylinder */ |
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__u32 d_acylinders; /* # of alt. cylinders per unit */ |
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__u16 d_rpm; /* rotational speed */ |
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__u16 d_interleave; /* hardware sector interleave */ |
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__u16 d_trackskew; /* sector 0 skew, per track */ |
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__u16 d_cylskew; /* sector 0 skew, per cylinder */ |
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__u32 d_headswitch; /* head switch time, usec */ |
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__u32 d_trkseek; /* track-to-track seek, usec */ |
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__u32 d_flags; /* generic flags */ |
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#define NDDATA 5 |
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__u32 d_drivedata[NDDATA]; /* drive-type specific information */ |
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#define NSPARE 5 |
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__u32 d_spare[NSPARE]; /* reserved for future use */ |
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__le32 d_magic2; /* the magic number (again) */ |
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__le16 d_checksum; /* xor of data incl. partitions */ |
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|
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/* filesystem and partition information: */ |
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__le16 d_npartitions; /* number of partitions in following */ |
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__le32 d_bbsize; /* size of boot area at sn0, bytes */ |
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__le32 d_sbsize; /* max size of fs superblock, bytes */ |
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struct bsd_partition { /* the partition table */ |
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__le32 p_size; /* number of sectors in partition */ |
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__le32 p_offset; /* starting sector */ |
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__le32 p_fsize; /* filesystem basic fragment size */ |
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__u8 p_fstype; /* filesystem type, see below */ |
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__u8 p_frag; /* filesystem fragments per block */ |
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__le16 p_cpg; /* filesystem cylinders per group */ |
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} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ |
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}; |
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|
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#if defined(CONFIG_BSD_DISKLABEL) |
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/* |
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* Create devices for BSD partitions listed in a disklabel, under a |
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* dos-like partition. See parse_extended() for more information. |
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*/ |
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static void parse_bsd(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin, char *flavour, |
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int max_partitions) |
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{ |
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Sector sect; |
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struct bsd_disklabel *l; |
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struct bsd_partition *p; |
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char tmp[64]; |
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|
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l = read_part_sector(state, offset + 1, §); |
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if (!l) |
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return; |
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if (le32_to_cpu(l->d_magic) != BSD_DISKMAGIC) { |
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put_dev_sector(sect); |
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return; |
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} |
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|
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snprintf(tmp, sizeof(tmp), " %s%d: <%s:", state->name, origin, flavour); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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|
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if (le16_to_cpu(l->d_npartitions) < max_partitions) |
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max_partitions = le16_to_cpu(l->d_npartitions); |
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for (p = l->d_partitions; p - l->d_partitions < max_partitions; p++) { |
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sector_t bsd_start, bsd_size; |
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|
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if (state->next == state->limit) |
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break; |
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if (p->p_fstype == BSD_FS_UNUSED) |
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continue; |
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bsd_start = le32_to_cpu(p->p_offset); |
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bsd_size = le32_to_cpu(p->p_size); |
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/* FreeBSD has relative offset if C partition offset is zero */ |
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if (memcmp(flavour, "bsd\0", 4) == 0 && |
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le32_to_cpu(l->d_partitions[2].p_offset) == 0) |
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bsd_start += offset; |
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if (offset == bsd_start && size == bsd_size) |
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/* full parent partition, we have it already */ |
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continue; |
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if (offset > bsd_start || offset+size < bsd_start+bsd_size) { |
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strlcat(state->pp_buf, "bad subpartition - ignored\n", PAGE_SIZE); |
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continue; |
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} |
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put_partition(state, state->next++, bsd_start, bsd_size); |
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} |
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put_dev_sector(sect); |
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if (le16_to_cpu(l->d_npartitions) > max_partitions) { |
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snprintf(tmp, sizeof(tmp), " (ignored %d more)", |
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le16_to_cpu(l->d_npartitions) - max_partitions); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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} |
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strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
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} |
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#endif |
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|
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static void parse_freebsd(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin) |
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{ |
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#ifdef CONFIG_BSD_DISKLABEL |
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parse_bsd(state, offset, size, origin, "bsd", BSD_MAXPARTITIONS); |
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#endif |
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} |
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|
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static void parse_netbsd(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin) |
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{ |
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#ifdef CONFIG_BSD_DISKLABEL |
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parse_bsd(state, offset, size, origin, "netbsd", BSD_MAXPARTITIONS); |
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#endif |
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} |
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|
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static void parse_openbsd(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin) |
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{ |
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#ifdef CONFIG_BSD_DISKLABEL |
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parse_bsd(state, offset, size, origin, "openbsd", |
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OPENBSD_MAXPARTITIONS); |
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#endif |
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} |
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|
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#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
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#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ |
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#define UNIXWARE_NUMSLICE 16 |
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#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ |
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|
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struct unixware_slice { |
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__le16 s_label; /* label */ |
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__le16 s_flags; /* permission flags */ |
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__le32 start_sect; /* starting sector */ |
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__le32 nr_sects; /* number of sectors in slice */ |
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}; |
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|
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struct unixware_disklabel { |
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__le32 d_type; /* drive type */ |
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__le32 d_magic; /* the magic number */ |
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__le32 d_version; /* version number */ |
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char d_serial[12]; /* serial number of the device */ |
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__le32 d_ncylinders; /* # of data cylinders per device */ |
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__le32 d_ntracks; /* # of tracks per cylinder */ |
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__le32 d_nsectors; /* # of data sectors per track */ |
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__le32 d_secsize; /* # of bytes per sector */ |
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__le32 d_part_start; /* # of first sector of this partition*/ |
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__le32 d_unknown1[12]; /* ? */ |
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__le32 d_alt_tbl; /* byte offset of alternate table */ |
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__le32 d_alt_len; /* byte length of alternate table */ |
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__le32 d_phys_cyl; /* # of physical cylinders per device */ |
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__le32 d_phys_trk; /* # of physical tracks per cylinder */ |
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__le32 d_phys_sec; /* # of physical sectors per track */ |
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__le32 d_phys_bytes; /* # of physical bytes per sector */ |
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__le32 d_unknown2; /* ? */ |
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__le32 d_unknown3; /* ? */ |
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__le32 d_pad[8]; /* pad */ |
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|
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struct unixware_vtoc { |
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__le32 v_magic; /* the magic number */ |
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__le32 v_version; /* version number */ |
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char v_name[8]; /* volume name */ |
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__le16 v_nslices; /* # of slices */ |
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__le16 v_unknown1; /* ? */ |
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__le32 v_reserved[10]; /* reserved */ |
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struct unixware_slice |
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v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ |
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} vtoc; |
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}; /* 408 */ |
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|
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/* |
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* Create devices for Unixware partitions listed in a disklabel, under a |
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* dos-like partition. See parse_extended() for more information. |
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*/ |
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static void parse_unixware(struct parsed_partitions *state, |
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sector_t offset, sector_t size, int origin) |
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{ |
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#ifdef CONFIG_UNIXWARE_DISKLABEL |
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Sector sect; |
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struct unixware_disklabel *l; |
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struct unixware_slice *p; |
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|
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l = read_part_sector(state, offset + 29, §); |
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if (!l) |
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return; |
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if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC || |
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le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) { |
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put_dev_sector(sect); |
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return; |
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} |
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{ |
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char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1]; |
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|
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snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin); |
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strlcat(state->pp_buf, tmp, PAGE_SIZE); |
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} |
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p = &l->vtoc.v_slice[1]; |
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/* I omit the 0th slice as it is the same as whole disk. */ |
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while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) { |
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if (state->next == state->limit) |
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break; |
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|
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if (p->s_label != UNIXWARE_FS_UNUSED) |
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put_partition(state, state->next++, |
|
le32_to_cpu(p->start_sect), |
|
le32_to_cpu(p->nr_sects)); |
|
p++; |
|
} |
|
put_dev_sector(sect); |
|
strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
|
#endif |
|
} |
|
|
|
#define MINIX_NR_SUBPARTITIONS 4 |
|
|
|
/* |
|
* Minix 2.0.0/2.0.2 subpartition support. |
|
* Anand Krishnamurthy <[email protected]> |
|
* Rajeev V. Pillai <[email protected]> |
|
*/ |
|
static void parse_minix(struct parsed_partitions *state, |
|
sector_t offset, sector_t size, int origin) |
|
{ |
|
#ifdef CONFIG_MINIX_SUBPARTITION |
|
Sector sect; |
|
unsigned char *data; |
|
struct msdos_partition *p; |
|
int i; |
|
|
|
data = read_part_sector(state, offset, §); |
|
if (!data) |
|
return; |
|
|
|
p = (struct msdos_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) && |
|
p->sys_ind == MINIX_PARTITION) { /* subpartition table present */ |
|
char tmp[1 + BDEVNAME_SIZE + 10 + 9 + 1]; |
|
|
|
snprintf(tmp, sizeof(tmp), " %s%d: <minix:", state->name, origin); |
|
strlcat(state->pp_buf, tmp, PAGE_SIZE); |
|
for (i = 0; i < MINIX_NR_SUBPARTITIONS; i++, p++) { |
|
if (state->next == state->limit) |
|
break; |
|
/* add each partition in use */ |
|
if (p->sys_ind == MINIX_PARTITION) |
|
put_partition(state, state->next++, |
|
start_sect(p), nr_sects(p)); |
|
} |
|
strlcat(state->pp_buf, " >\n", PAGE_SIZE); |
|
} |
|
put_dev_sector(sect); |
|
#endif /* CONFIG_MINIX_SUBPARTITION */ |
|
} |
|
|
|
static struct { |
|
unsigned char id; |
|
void (*parse)(struct parsed_partitions *, sector_t, sector_t, 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) |
|
{ |
|
sector_t sector_size; |
|
Sector sect; |
|
unsigned char *data; |
|
struct msdos_partition *p; |
|
struct fat_boot_sector *fb; |
|
int slot; |
|
u32 disksig; |
|
|
|
sector_size = queue_logical_block_size(state->disk->queue) / 512; |
|
data = read_part_sector(state, 0, §); |
|
if (!data) |
|
return -1; |
|
|
|
/* |
|
* Note order! (some AIX disks, e.g. unbootable kind, |
|
* have no MSDOS 55aa) |
|
*/ |
|
if (aix_magic_present(state, data)) { |
|
put_dev_sector(sect); |
|
#ifdef CONFIG_AIX_PARTITION |
|
return aix_partition(state); |
|
#else |
|
strlcat(state->pp_buf, " [AIX]", PAGE_SIZE); |
|
return 0; |
|
#endif |
|
} |
|
|
|
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 msdos_partition *) (data + 0x1be); |
|
for (slot = 1; slot <= 4; slot++, p++) { |
|
if (p->boot_ind != 0 && p->boot_ind != 0x80) { |
|
/* |
|
* Even without a valid boot indicator value |
|
* its still possible this is valid FAT filesystem |
|
* without a partition table. |
|
*/ |
|
fb = (struct fat_boot_sector *) data; |
|
if (slot == 1 && fb->reserved && fb->fats |
|
&& fat_valid_media(fb->media)) { |
|
strlcat(state->pp_buf, "\n", PAGE_SIZE); |
|
put_dev_sector(sect); |
|
return 1; |
|
} else { |
|
put_dev_sector(sect); |
|
return 0; |
|
} |
|
} |
|
} |
|
|
|
#ifdef CONFIG_EFI_PARTITION |
|
p = (struct msdos_partition *) (data + 0x1be); |
|
for (slot = 1 ; slot <= 4 ; slot++, p++) { |
|
/* If this is an EFI GPT disk, msdos should ignore it. */ |
|
if (p->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT) { |
|
put_dev_sector(sect); |
|
return 0; |
|
} |
|
} |
|
#endif |
|
p = (struct msdos_partition *) (data + 0x1be); |
|
|
|
disksig = le32_to_cpup((__le32 *)(data + 0x1b8)); |
|
|
|
/* |
|
* 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++) { |
|
sector_t start = start_sect(p)*sector_size; |
|
sector_t 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 |
|
* FIXME: this uses one logical sector for > 512b |
|
* sector, although it may not be enough/proper. |
|
*/ |
|
sector_t n = 2; |
|
|
|
n = min(size, max(sector_size, n)); |
|
put_partition(state, slot, start, n); |
|
|
|
strlcat(state->pp_buf, " <", PAGE_SIZE); |
|
parse_extended(state, start, size, disksig); |
|
strlcat(state->pp_buf, " >", PAGE_SIZE); |
|
continue; |
|
} |
|
put_partition(state, slot, start, size); |
|
set_info(state, slot, disksig); |
|
if (p->sys_ind == LINUX_RAID_PARTITION) |
|
state->parts[slot].flags = ADDPART_FLAG_RAID; |
|
if (p->sys_ind == DM6_PARTITION) |
|
strlcat(state->pp_buf, "[DM]", PAGE_SIZE); |
|
if (p->sys_ind == EZD_PARTITION) |
|
strlcat(state->pp_buf, "[EZD]", PAGE_SIZE); |
|
} |
|
|
|
strlcat(state->pp_buf, "\n", PAGE_SIZE); |
|
|
|
/* second pass - output for each on a separate line */ |
|
p = (struct msdos_partition *) (0x1be + data); |
|
for (slot = 1 ; slot <= 4 ; slot++, p++) { |
|
unsigned char id = p->sys_ind; |
|
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, start_sect(p) * sector_size, |
|
nr_sects(p) * sector_size, slot); |
|
} |
|
put_dev_sector(sect); |
|
return 1; |
|
}
|
|
|