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![Christoph Hellwig](/assets/img/avatar_default.png)
All these are just used in block/partitions/msdos.c, so move them out of the genhd.h driver included by every driver. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
717 lines
21 KiB
C
717 lines
21 KiB
C
// 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, lankeste@fwi.uva.nl, 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 <yogo@math.tau.ac.il>
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* updated by Marc Espie <Marc.Espie@openbsd.org>
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*
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* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
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* and Krzysztof G. Baranowski <kgb@knm.org.pl>
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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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#include "check.h"
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#include "efi.h"
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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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#define SYS_IND(p) get_unaligned(&p->sys_ind)
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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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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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static inline int is_extended_partition(struct msdos_partition *p)
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{
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return (SYS_IND(p) == DOS_EXTENDED_PARTITION ||
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SYS_IND(p) == WIN98_EXTENDED_PARTITION ||
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SYS_IND(p) == LINUX_EXTENDED_PARTITION);
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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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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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/* 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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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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* 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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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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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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* 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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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 = bdev_logical_block_size(state->bdev) / 512;
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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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this_sector = first_sector;
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this_size = first_size;
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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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* 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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* 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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if (!nr_sects(p) || is_extended_partition(p))
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continue;
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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 (SYS_IND(p) == 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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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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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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/* james@bpgc.com: 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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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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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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/* 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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#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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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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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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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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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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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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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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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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#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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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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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 */
|
|
__le32 d_part_start; /* # of first sector of this partition*/
|
|
__le32 d_unknown1[12]; /* ? */
|
|
__le32 d_alt_tbl; /* byte offset of alternate table */
|
|
__le32 d_alt_len; /* byte length of alternate table */
|
|
__le32 d_phys_cyl; /* # of physical cylinders per device */
|
|
__le32 d_phys_trk; /* # of physical tracks per cylinder */
|
|
__le32 d_phys_sec; /* # of physical sectors per track */
|
|
__le32 d_phys_bytes; /* # of physical bytes per sector */
|
|
__le32 d_unknown2; /* ? */
|
|
__le32 d_unknown3; /* ? */
|
|
__le32 d_pad[8]; /* pad */
|
|
|
|
struct unixware_vtoc {
|
|
__le32 v_magic; /* the magic number */
|
|
__le32 v_version; /* version number */
|
|
char v_name[8]; /* volume name */
|
|
__le16 v_nslices; /* # of slices */
|
|
__le16 v_unknown1; /* ? */
|
|
__le32 v_reserved[10]; /* reserved */
|
|
struct unixware_slice
|
|
v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
|
|
} vtoc;
|
|
}; /* 408 */
|
|
|
|
/*
|
|
* Create devices for Unixware partitions listed in a disklabel, under a
|
|
* dos-like partition. See parse_extended() for more information.
|
|
*/
|
|
static void parse_unixware(struct parsed_partitions *state,
|
|
sector_t offset, sector_t size, int origin)
|
|
{
|
|
#ifdef CONFIG_UNIXWARE_DISKLABEL
|
|
Sector sect;
|
|
struct unixware_disklabel *l;
|
|
struct unixware_slice *p;
|
|
|
|
l = read_part_sector(state, offset + 29, §);
|
|
if (!l)
|
|
return;
|
|
if (le32_to_cpu(l->d_magic) != UNIXWARE_DISKMAGIC ||
|
|
le32_to_cpu(l->vtoc.v_magic) != UNIXWARE_DISKMAGIC2) {
|
|
put_dev_sector(sect);
|
|
return;
|
|
}
|
|
{
|
|
char tmp[1 + BDEVNAME_SIZE + 10 + 12 + 1];
|
|
|
|
snprintf(tmp, sizeof(tmp), " %s%d: <unixware:", state->name, origin);
|
|
strlcat(state->pp_buf, tmp, PAGE_SIZE);
|
|
}
|
|
p = &l->vtoc.v_slice[1];
|
|
/* I omit the 0th slice as it is the same as whole disk. */
|
|
while (p - &l->vtoc.v_slice[0] < UNIXWARE_NUMSLICE) {
|
|
if (state->next == state->limit)
|
|
break;
|
|
|
|
if (p->s_label != UNIXWARE_FS_UNUSED)
|
|
put_partition(state, state->next++,
|
|
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 <anandk@wiproge.med.ge.com>
|
|
* Rajeev V. Pillai <rajeevvp@yahoo.com>
|
|
*/
|
|
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) &&
|
|
SYS_IND(p) == 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 (SYS_IND(p) == 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 = bdev_logical_block_size(state->bdev) / 512;
|
|
Sector sect;
|
|
unsigned char *data;
|
|
struct msdos_partition *p;
|
|
struct fat_boot_sector *fb;
|
|
int slot;
|
|
u32 disksig;
|
|
|
|
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 inidicator 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 (SYS_IND(p) == 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 (SYS_IND(p) == LINUX_RAID_PARTITION)
|
|
state->parts[slot].flags = ADDPART_FLAG_RAID;
|
|
if (SYS_IND(p) == DM6_PARTITION)
|
|
strlcat(state->pp_buf, "[DM]", PAGE_SIZE);
|
|
if (SYS_IND(p) == 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 = 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, start_sect(p) * sector_size,
|
|
nr_sects(p) * sector_size, slot);
|
|
}
|
|
put_dev_sector(sect);
|
|
return 1;
|
|
}
|