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Commit 4966a3c5 authored by Richard Russon's avatar Richard Russon Committed by Linus Torvalds
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[PATCH] New LDM Driver (Windows Dynamic Disks) 

This is a complete rewrite of the LDM driver (support for Windows
Dynamic Disks).  It incorporates Al Viro's recent partition handling
tidy ups.

Details:
  LDM Driver rewritten.  More efficient.  Much smaller memory footprint.

  The old driver was little more than a stopgap.
  The new driver is a complete rewrite
  based on a much better understanding of the database
  based on much more reverse engineering
  more able to spot errors and inconsistancies
  it has a much smaller memory footprint
  no longer considered experimental
  accompanied by brief info: Documentation/ldm.txt
parent f4f65023
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Documentation/00-INDEX
View file @ 4966a3c5
......@@ -118,6 +118,8 @@ kernel-parameters.txt
- summary listing of command line / boot prompt args for the kernel.
kmod.txt
- info on the kernel module loader/unloader (kerneld replacement).
ldm.txt
- a brief description of LDM (Windows Dynamic Disks).
locks.txt
- info on file locking implementations, flock() vs. fcntl(), etc.
logo.gif
......
Documentation/ldm.txt 0 → 100644
View file @ 4966a3c5
LDM - Logical Disk Manager (Dynamic Disks)
------------------------------------------
Overview
--------
Windows 2000 and XP use a new partitioning scheme. It is a complete
replacement for the MSDOS style partitions. It stores its information in a
1MiB journalled database at the end of the physical disk. The size of
partitions is limited only by disk space. The maximum number of partitions is
nearly 2000.
Any partitions created under the LDM are called "Dynamic Disks". There are no
longer any primary or extended partitions. Normal MSDOS style partitions are
now known as Basic Disks.
If you wish to use Spanned, Striped, Mirrored or RAID 5 Volumes, you must use
Dynamic Disks. The journalling allows Windows to make changes to these
partitions and filesystems without the need to reboot.
Once the LDM driver has divided up the disk, you can use the MD driver to
assemble any multi-partition volumes, e.g. Stripes, RAID5.
To prevent legacy applications from repartitioning the disk, the LDM creates a
dummy MSDOS partition containing one disk-sized partition.
Example
-------
Below we have a 50MiB disk, divided into seven partitions.
N.B. The missing 1MiB at the end of the disk is where the LDM database is
stored.
Device | Offset Bytes Sectors MiB | Size Bytes Sectors MiB
-------+----------------------------+---------------------------
hda | 0 0 0 | 52428800 102400 50
hda1 | 51380224 100352 49 | 1048576 2048 1
hda2 | 16384 32 0 | 6979584 13632 6
hda3 | 6995968 13664 6 | 10485760 20480 10
hda4 | 17481728 34144 16 | 4194304 8192 4
hda5 | 21676032 42336 20 | 5242880 10240 5
hda6 | 26918912 52576 25 | 10485760 20480 10
hda7 | 37404672 73056 35 | 13959168 27264 13
The LDM Database may not store the partitions in the order that they appear on
disk, but the driver will sort them.
When Linux boots, you will see something like:
hda: 102400 sectors w/32KiB Cache, CHS=50/64/32
hda: [LDM] hda1 hda2 hda3 hda4 hda5 hda6 hda7
Compiling LDM Support
---------------------
To enable LDM, choose the following two options:
"Advanced partition selection" CONFIG_PARTITION_ADVANCED
"Windows Logical Disk Manager (Dynamic Disk) support" CONFIG_LDM_PARTITION
If you believe the driver isn't working as it should, you can enable the extra
debugging code. This will produce a LOT of output. The option is:
"Windows LDM extra logging" CONFIG_LDM_DEBUG
N.B. The partition code cannot be compiled as a module.
As with all the partition code, if the driver doesn't see signs of its type of
partition, it will pass control to another driver, so there is no harm in
enabling it.
If you have Dynamic Disks but don't enable the driver, then all you will see
is a dummy MSDOS partition filling the whole disk. You won't be able to mount
any of the volumes on the disk.
Booting
-------
If you enable LDM support, then lilo is capable of booting from any of the
discovered partitions. However, grub does not understand the LDM partitioning
and cannot boot from a Dynamic Disk.
More Documentation
------------------
There is an Overview of the LDM online together with complete Technical
Documentation. It can also be downloaded in html.
http://linux-ntfs.sourceforge.net/ldm/index.html
http://linux-ntfs.sourceforge.net/downloads.html
If you have any LDM questions that aren't answered on the website, email me.
Cheers,
FlatCap - Richard Russon
ldm@flatcap.org
fs/partitions/Config.help
View file @ 4966a3c5
......@@ -46,15 +46,14 @@ CONFIG_LDM_PARTITION
Windows 2000 introduced the concept of Dynamic Disks to get around
the limitations of the PC's partitioning scheme. The Logical Disk
Manager allows the user to repartion a disk and create spanned,
Manager allows the user to repartition a disk and create spanned,
mirrored, striped or RAID volumes, all without the need for
rebooting.
Normal partitions are now called Basic Disks under Windows 2000 and
XP.
Technical documentation to accompany this driver is available from:
<http://linux-ntfs.sf.net/ldm/>.
For a fuller description read <file:Documentation/ldm.txt>.
If unsure, say N.
......
fs/partitions/Config.in
View file @ 4966a3c5
......@@ -25,7 +25,7 @@ if [ "$CONFIG_PARTITION_ADVANCED" = "y" ]; then
bool ' Solaris (x86) partition table support' CONFIG_SOLARIS_X86_PARTITION
bool ' Unixware slices support' CONFIG_UNIXWARE_DISKLABEL
fi
dep_bool ' Windows Logical Disk Manager (Dynamic Disk) support (EXPERIMENTAL)' CONFIG_LDM_PARTITION $CONFIG_EXPERIMENTAL
dep_bool ' Windows Logical Disk Manager (Dynamic Disk) support' CONFIG_LDM_PARTITION
if [ "$CONFIG_LDM_PARTITION" = "y" ]; then
bool ' Windows LDM extra logging' CONFIG_LDM_DEBUG
fi
......
fs/partitions/ldm.c
View file @ 4966a3c5
/*
* ldm - Part of the Linux-NTFS project.
/**
* ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
*
* Copyright (C) 2001 Richard Russon <ldm@flatcap.org>
* Copyright (C) 2001 Anton Altaparmakov (AIA)
* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
* Copyright (C) 2001 Anton Altaparmakov <aia21@cantab.net>
* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
*
* Documentation is available at http://linux-ntfs.sf.net/ldm
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any later
* version.
*
* You should have received a copy of the GNU General Public License
* along with this program (in the main directory of the Linux-NTFS source
* in the file COPYING); if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* 28/10/2001 - Added sorting of ldm partitions. (AIA)
* You should have received a copy of the GNU General Public License along with
* this program (in the main directory of the source in the file COPYING); if
* not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
#include <linux/slab.h>
#include "check.h"
#include <linux/stringify.h>
#include "ldm.h"
#include "check.h"
#include "msdos.h"
#if 0 /* Fool kernel-doc since it doesn't do macros yet. */
typedef enum {
FALSE = 0,
TRUE = 1
} BOOL;
/**
* ldm_debug - output an error message if debugging was enabled at compile time
* @f: a printf format string containing the message
* @...: the variables to substitute into @f
* ldm_debug/info/error/crit - Output an error message
* @f: A printf format string containing the message
* @...: Variables to substitute into @f
*
* ldm_debug() writes a DEBUG level message to the syslog but only if the
* driver was compiled with debug enabled. Otherwise, the call turns into a NOP.
*/
static void ldm_debug(const char *f, ...);
#ifndef CONFIG_LDM_DEBUG
#define ldm_debug(...) do {} while (0)
#else
#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __FUNCTION__, f, ##a)
#endif
#ifdef CONFIG_LDM_DEBUG
#define ldm_debug(f, a...) \
{ \
printk(LDM_DEBUG " DEBUG (%s, %d): %s: ", \
__FILE__, __LINE__, __FUNCTION__); \
printk(f, ##a); \
}
#else /* !CONFIG_LDM_DEBUG */
#define ldm_debug(f, a...) do {} while (0)
#endif /* !CONFIG_LDM_DEBUG */
/* Necessary forward declarations. */
static int parse_privhead(const u8 *, struct privhead *);
static u64 get_vnum(const u8 *, int *);
static int get_vstr(const u8 *, u8 *, const int);
#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __FUNCTION__, f, ##a)
#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __FUNCTION__, f, ##a)
#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __FUNCTION__, f, ##a)
__attribute__ ((format (printf, 3, 4)))
static void _ldm_printk (const char *level, const char *function,
const char *fmt, ...)
{
static char buf[128];
va_list args;
va_start (args, fmt);
vsnprintf (buf, sizeof (buf), fmt, args);
va_end (args);
printk ("%s%s(): %s\n", level, function, buf);
}
/**
* parse_vblk_part - parse a LDM database vblk partition record
* @buffer: vblk partition record loaded from the LDM database
* @buf_size: size of @buffer in bytes
* @vb: in memory vblk structure to return parsed information in
* ldm_parse_hexbyte - Convert a ASCII hex number to a byte
* @src: Pointer to at least 2 characters to convert.
*
* This parses the LDM database vblk record of type VBLK_PART, i.e. a partition
* record, supplied in @buffer and sets up the in memory vblk structure @vb
* with the obtained information.
* Convert a two character ASCII hex string to a number.
*
* Return 1 on success and -1 on error, in which case @vb is undefined.
* Return: 0-255 Success, the byte was parsed correctly
* -1 Error, an invalid character was supplied
*/
static int parse_vblk_part(const u8 *buffer, const int buf_size,
struct vblk *vb)
static int ldm_parse_hexbyte (const u8 *src)
{
int err, rel_objid, rel_name, rel_size, rel_parent;
unsigned int x; /* For correct wrapping */
int h;
if (0x34 >= buf_size)
return -1;
/* Calculate relative offsets. */
rel_objid = 1 + buffer[0x18];
if (0x18 + rel_objid >= buf_size)
return -1;
rel_name = 1 + buffer[0x18 + rel_objid] + rel_objid;
if (0x34 + rel_name >= buf_size)
return -1;
rel_size = 1 + buffer[0x34 + rel_name] + rel_name;
if (0x34 + rel_size >= buf_size)
return -1;
rel_parent = 1 + buffer[0x34 + rel_size] + rel_size;
if (0x34 + rel_parent >= buf_size)
return -1;
/* Setup @vb. */
vb->vblk_type = VBLK_PART;
vb->obj_id = get_vnum(buffer + 0x18, &err);
if (err || 0x34 + rel_parent + buffer[0x34 + rel_parent] >= buf_size)
return -1;
vb->disk_id = get_vnum(buffer + 0x34 + rel_parent, &err);
if (err || 0x24 + rel_name + 8 > buf_size)
return -1;
vb->start_sector = BE64(buffer + 0x24 + rel_name);
if (0x34 + rel_name + buffer[0x34 + rel_name] >= buf_size)
return -1;
vb->num_sectors = get_vnum(buffer + 0x34 + rel_name, &err);
if (err || 0x18 + rel_objid + buffer[0x18 + rel_objid] >= buf_size)
/* high part */
if ((x = src[0] - '0') <= '9'-'0') h = x;
else if ((x = src[0] - 'a') <= 'f'-'a') h = x+10;
else if ((x = src[0] - 'A') <= 'F'-'A') h = x+10;
else return -1;
h <<= 4;
/* low part */
if ((x = src[1] - '0') <= '9'-'0') return h | x;
if ((x = src[1] - 'a') <= 'f'-'a') return h | (x+10);
if ((x = src[1] - 'A') <= 'F'-'A') return h | (x+10);
return -1;
err = get_vstr(buffer + 0x18 + rel_objid, vb->name, sizeof(vb->name));
if (err == -1)
return err;
ldm_debug("Parsed Partition VBLK successfully.\n");
return 1;
}
/**
* parse_vblk - parse a LDM database vblk record
* @buffer: vblk record loaded from the LDM database
* @buf_size: size of @buffer in bytes
* @vb: in memory vblk structure to return parsed information in
* ldm_parse_guid - Convert GUID from ASCII to binary
* @src: 36 char string of the form fa50ff2b-f2e8-45de-83fa-65417f2f49ba
* @dest: Memory block to hold binary GUID (16 bytes)
*
* This parses the LDM database vblk record supplied in @buffer and sets up
* the in memory vblk structure @vb with the obtained information.
* N.B. The GUID need not be NULL terminated.
*
* Return 1 on success, 0 if successful but record not in use, and -1 on error.
* If the return value is 0 or -1, @vb is undefined.
* Return: TRUE @dest contains binary GUID
* FALSE @dest contents are undefined
*/
static BOOL ldm_parse_guid (const u8 *src, u8 *dest)
{
static const int size[] = { 4, 2, 2, 2, 6 };
int i, j, v;
if (src[8] != '-' || src[13] != '-' ||
src[18] != '-' || src[23] != '-')
return FALSE;
for (j = 0; j < 5; j++, src++)
for (i = 0; i < size[j]; i++, src+=2, *dest++ = v)
if ((v = ldm_parse_hexbyte (src)) < 0)
return FALSE;
return TRUE;
}
/**
* ldm_parse_privhead - Read the LDM Database PRIVHEAD structure
* @data: Raw database PRIVHEAD structure loaded from the device
* @ph: In-memory privhead structure in which to return parsed information
*
* NOTE: Currently the only record type we handle is VBLK_PART, i.e. records
* describing a partition. For all others, we just set @vb->vblk_type to 0 and
* return success. This of course means that if @vb->vblk_type is zero, all
* other fields in @vb are undefined.
* This parses the LDM database PRIVHEAD structure supplied in @data and
* sets up the in-memory privhead structure @ph with the obtained information.
*
* Return: TRUE @ph contains the PRIVHEAD data
* FALSE @ph contents are undefined
*/
static int parse_vblk(const u8 *buffer, const int buf_size, struct vblk *vb)
static BOOL ldm_parse_privhead (const u8 *data, struct privhead *ph)
{
int err = 1;
BUG_ON (!data || !ph);
if (buf_size < 0x14)
return -1;
if (MAGIC_VBLK != BE32(buffer)) {
printk(LDM_CRIT "Cannot find VBLK, database may be corrupt.\n");
return -1;
if (MAGIC_PRIVHEAD != BE64 (data)) {
ldm_error ("Cannot find PRIVHEAD structure. LDM database is"
" corrupt. Aborting.");
return FALSE;
}
if ((BE16(buffer + 0x0E) == 0) || /* Record is not in use. */
(BE16(buffer + 0x0C) != 0)) /* Part 2 of an ext. record */
return 0;
/* FIXME: What about extended VBLKs? */
switch (buffer[0x13]) {
case VBLK_PART:
err = parse_vblk_part(buffer, buf_size, vb);
break;
default:
vb->vblk_type = 0;
ph->ver_major = BE16 (data + 0x000C);
ph->ver_minor = BE16 (data + 0x000E);
ph->logical_disk_start = BE64 (data + 0x011B);
ph->logical_disk_size = BE64 (data + 0x0123);
ph->config_start = BE64 (data + 0x012B);
ph->config_size = BE64 (data + 0x0133);
if ((ph->ver_major != 2) || (ph->ver_minor != 11)) {
ldm_error ("Expected PRIVHEAD version %d.%d, got %d.%d."
" Aborting.", 2, 11, ph->ver_major, ph->ver_minor);
return FALSE;
}
if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */
/* Warn the user and continue, carefully */
ldm_info ("Database is normally %u bytes, it claims to "
"be %llu bytes.", LDM_DB_SIZE,
(unsigned long long)ph->config_size );
}
if ((ph->logical_disk_size == 0) ||
(ph->logical_disk_start + ph->logical_disk_size > ph->config_start)) {
ldm_error ("PRIVHEAD disk size doesn't match real disk size");
return FALSE;
}
if (!ldm_parse_guid (data + 0x0030, ph->disk_id)) {
ldm_error ("PRIVHEAD contains an invalid GUID.");
return FALSE;
}
if (err != -1)
ldm_debug("Parsed VBLK successfully.\n");
return err;
ldm_debug ("Parsed PRIVHEAD successfully.");
return TRUE;
}
/**
* add_partition_to_list - insert partition into a partition list
* @pl: sorted list of partitions
* @disk_size: number of sectors on the disk device
* @start: first sector within the disk device
* @size: number of sectors on the partition device
* ldm_parse_tocblock - Read the LDM Database TOCBLOCK structure
* @data: Raw database TOCBLOCK structure loaded from the device
* @toc: In-memory toc structure in which to return parsed information
*
* This sanity checks the partition specified by @start and @size against the
* device specified by @hd and inserts the partition into the sorted partition
* list @pl if the checks pass.
* This parses the LDM Database TOCBLOCK (table of contents) structure supplied
* in @data and sets up the in-memory tocblock structure @toc with the obtained
* information.
*
* On success return 1, otherwise return -1.
* N.B. The *_start and *_size values returned in @toc are not range-checked.
*
* TODO: Add sanity check for overlapping partitions. (AIA)
* Return: TRUE @toc contains the TOCBLOCK data
* FALSE @toc contents are undefined
*/
static int add_partition_to_list(struct list_head *pl,
const unsigned long disk_size,
const unsigned long start,
const unsigned long size)
static BOOL ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
{
struct ldm_part *lp, *lptmp;
struct list_head *tmp;
BUG_ON (!data || !toc);
if (start < 1 || start + size > disk_size) {
printk(LDM_CRIT "LDM partition exceeds physical disk. "
"Skipping.\n");
return -1;
if (MAGIC_TOCBLOCK != BE64 (data)) {
ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
return FALSE;
}
lp = (struct ldm_part*)kmalloc(sizeof(struct ldm_part), GFP_KERNEL);
if (!lp) {
printk(LDM_CRIT "Not enough memory! Aborting LDM partition "
"parsing.\n");
return -2;
}
INIT_LIST_HEAD(&lp->part_list);
lp->start = start;
lp->size = size;
list_for_each(tmp, pl) {
lptmp = list_entry(tmp, struct ldm_part, part_list);
if (start > lptmp->start)
continue;
if (start < lptmp->start)
break;
printk(LDM_CRIT "Duplicate LDM partition entry! Skipping.\n");
kfree(lp);
return -1;
strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name));
toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0;
toc->bitmap1_start = BE64 (data + 0x2E);
toc->bitmap1_size = BE64 (data + 0x36);
if (strncmp (toc->bitmap1_name, TOC_BITMAP1,
sizeof (toc->bitmap1_name)) != 0) {
ldm_crit ("TOCBLOCK's first bitmap is '%s', should be '%s'.",
TOC_BITMAP1, toc->bitmap1_name);
return FALSE;
}
strncpy (toc->bitmap2_name, data + 0x46, sizeof (toc->bitmap2_name));
toc->bitmap2_name[sizeof (toc->bitmap2_name) - 1] = 0;
toc->bitmap2_start = BE64 (data + 0x50);
toc->bitmap2_size = BE64 (data + 0x58);
if (strncmp (toc->bitmap2_name, TOC_BITMAP2,
sizeof (toc->bitmap2_name)) != 0) {
ldm_crit ("TOCBLOCK's second bitmap is '%s', should be '%s'.",
TOC_BITMAP2, toc->bitmap2_name);
return FALSE;
}
list_add_tail(&lp->part_list, tmp);
ldm_debug("Added LDM partition successfully.\n");
return 1;
ldm_debug ("Parsed TOCBLOCK successfully.");
return TRUE;
}
/**
* create_data_partitions - create the data partition devices
* @hd: gendisk structure in which to create the data partitions
* @first_part_minor: first minor number of data partition devices
* @dev: partition device holding the LDM database
* @vm: in memory vmdb structure of @dev
* @ph: in memory privhead structure of the disk device
* @dk: in memory ldmdisk structure of the disk device
* ldm_parse_vmdb - Read the LDM Database VMDB structure
* @data: Raw database VMDB structure loaded from the device
* @vm: In-memory vmdb structure in which to return parsed information
*
* The database contains ALL the partitions for ALL the disks, so we need to
* filter out this specific disk. Using the disk's object id, we can find all
* the partitions in the database that belong to this disk.
* This parses the LDM Database VMDB structure supplied in @data and sets up
* the in-memory vmdb structure @vm with the obtained information.
*
* For each found partition, we create a corresponding partition device starting
* with minor number @first_part_minor. But we do this in such a way that we
* actually sort the partitions in order of on-disk position. Any invalid
* partitions are completely ignored/skipped (an error is output but that's
* all).
* N.B. The *_start, *_size and *_seq values will be range-checked later.
*
* Return 1 on success and -1 on error.
* Return: TRUE @vm contains VMDB info
* FALSE @vm contents are undefined
*/
static int create_data_partitions(struct parsed_partitions *state,
int slot, struct block_device *bdev, const struct vmdb *vm,
const struct privhead *ph, const struct ldmdisk *dk,
unsigned long base)
static BOOL ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
{
Sector sect;
unsigned char *data;
struct vblk *vb;
LIST_HEAD(pl); /* Sorted list of partitions. */
struct ldm_part *lp;
struct list_head *tmp;
int vblk;
int vsize; /* VBLK size. */
int perbuf; /* VBLKs per buffer. */
int buffer, lastbuf, lastofs, err;
vb = (struct vblk*)kmalloc(sizeof(struct vblk), GFP_KERNEL);
if (!vb)
goto no_mem;
vsize = vm->vblk_size;
if (vsize < 1 || vsize > 512)
goto err_out;
perbuf = 512 / vsize;
if (perbuf < 1 || 512 % vsize)
goto err_out;
/* 512 == VMDB size */
lastbuf = vm->last_vblk_seq / perbuf - 1;
lastofs = vm->last_vblk_seq % perbuf;
if (lastofs)
lastbuf++;
if (OFF_VBLK * LDM_BLOCKSIZE + vm->last_vblk_seq * vsize >
ph->config_size * 512)
goto err_out;
for (buffer = 0; buffer < lastbuf; buffer++) {
data = read_dev_sector(bdev, base + 2*OFF_VBLK + buffer, &sect);
if (!data)
goto read_err;
for (vblk = 0; vblk < perbuf; vblk++) {
u8 *block;
if (lastofs && buffer == lastbuf - 1 && vblk >= lastofs)
break;
block = data + vsize * vblk;
if (block + vsize > data + 512)
goto brelse_out;
if (parse_vblk(block, vsize, vb) != 1)
continue;
if (vb->vblk_type != VBLK_PART)
continue;
if (dk->obj_id != vb->disk_id)
continue;
/* Ignore invalid partition errors. */
if (add_partition_to_list(&pl,
bdev->bd_inode->i_size>>9,
vb->start_sector +
ph->logical_disk_start,
vb->num_sectors) < -1)
goto brelse_out;
BUG_ON (!data || !vm);
if (MAGIC_VMDB != BE32 (data)) {
ldm_crit ("Cannot find the VMDB, database may be corrupt.");
return FALSE;
}
put_dev_sector(sect);
vm->ver_major = BE16 (data + 0x12);
vm->ver_minor = BE16 (data + 0x14);
if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
ldm_error ("Expected VMDB version %d.%d, got %d.%d. "
"Aborting.", 4, 10, vm->ver_major, vm->ver_minor);
return FALSE;
}
err = 1;
out:
/* Finally create the nicely sorted data partitions. */
printk(" <");
list_for_each(tmp, &pl) {
lp = list_entry(tmp, struct ldm_part, part_list);
put_partition(state, slot++, lp->start, lp->size);
}
printk(" >\n");
if (!list_empty(&pl)) {
struct list_head *tmp2;
/* Cleanup the partition list which is now superfluous. */
list_for_each_safe(tmp, tmp2, &pl) {
lp = list_entry(tmp, struct ldm_part, part_list);
list_del(tmp);
kfree(lp);
}
}
kfree(vb);
return err;
brelse_out:
put_dev_sector(sect);
goto err_out;
no_mem:
printk(LDM_CRIT "Not enough memory to allocate required buffers.\n");
goto err_out;
read_err:
printk(LDM_CRIT "Disk read failed in create_partitions.\n");
err_out:
err = -1;
goto out;
vm->vblk_size = BE32 (data + 0x08);
vm->vblk_offset = BE32 (data + 0x0C);
vm->last_vblk_seq = BE32 (data + 0x04);
ldm_debug ("Parsed VMDB successfully.");
return TRUE;
}
/**
* get_vnum - convert a variable-width, big endian number, to cpu u64 one
* @block: pointer to the variable-width number to convert
* @err: address of an integer into which to return the error code.
* ldm_compare_privheads - Compare two privhead objects
* @ph1: First privhead
* @ph2: Second privhead
*
* This converts a variable-width, big endian number into a 64-bit, CPU format
* number and returns the result with err set to 0. If an error occurs return 0
* with err set to -1.
* This compares the two privhead structures @ph1 and @ph2.
*
* The first byte of a variable-width number is the size of the number in bytes.
* Return: TRUE Identical
* FALSE Different
*/
static u64 get_vnum(const u8 *block, int *err)
static BOOL ldm_compare_privheads (const struct privhead *ph1,
const struct privhead *ph2)
{
u64 tmp = 0ULL;
u8 length = *block++;
BUG_ON (!ph1 || !ph2);
if (length && length <= 8) {
while (length--)
tmp = (tmp << 8) | *block++;
*err = 0;
} else {
printk(LDM_ERR "Illegal length in get_vnum(): %d.\n", length);
*err = 1;
}
return tmp;
return ((ph1->ver_major == ph2->ver_major) &&
(ph1->ver_minor == ph2->ver_minor) &&
(ph1->logical_disk_start == ph2->logical_disk_start) &&
(ph1->logical_disk_size == ph2->logical_disk_size) &&
(ph1->config_start == ph2->config_start) &&
(ph1->config_size == ph2->config_size) &&
!memcmp (ph1->disk_id, ph2->disk_id, GUID_SIZE));
}
/**
* get_vstr - convert a counted, non-null-terminated ASCII string to C-style one
* @block: string to convert
* @buffer: output buffer
* @buflen: size of output buffer
* ldm_compare_tocblocks - Compare two tocblock objects
* @toc1: First toc
* @toc2: Second toc
*
* This converts @block, a counted, non-null-terminated ASCII string, into a
* C-style, null-terminated, ASCII string and returns this in @buffer. The
* maximum number of characters converted is given by @buflen.
* This compares the two tocblock structures @toc1 and @toc2.
*
* The first bytes of a counted string stores the length of the string in bytes.
* Return: TRUE Identical
* FALSE Different
*/
static BOOL ldm_compare_tocblocks (const struct tocblock *toc1,
const struct tocblock *toc2)
{
BUG_ON (!toc1 || !toc2);
return ((toc1->bitmap1_start == toc2->bitmap1_start) &&
(toc1->bitmap1_size == toc2->bitmap1_size) &&
(toc1->bitmap2_start == toc2->bitmap2_start) &&
(toc1->bitmap2_size == toc2->bitmap2_size) &&
!strncmp (toc1->bitmap1_name, toc2->bitmap1_name,
sizeof (toc1->bitmap1_name)) &&
!strncmp (toc1->bitmap2_name, toc2->bitmap2_name,
sizeof (toc1->bitmap2_name)));
}
/**
* ldm_validate_privheads - Compare the primary privhead with its backups
* @bdev: Device holding the LDM Database
* @ph1: Memory struct to fill with ph contents
*
* Read and compare all three privheads from disk.
*
* The privheads on disk show the size and location of the main disk area and
* the configuration area (the database). The values are range-checked against
* @hd, which contains the real size of the disk.
*
* Return the number of characters written to @buffer, not including the
* terminating null character, on success, and -1 on error, in which case
* @buffer is not defined.
* Return: TRUE Success
* FALSE Error
*/
static int get_vstr(const u8 *block, u8 *buffer, const int buflen)
static BOOL ldm_validate_privheads (struct block_device *bdev,
struct privhead *ph1)
{
int length = block[0];
static const int off[3] = { OFF_PRIV1, OFF_PRIV2, OFF_PRIV3 };
struct privhead *ph[3] = { ph1 };
Sector sect;
u8 *data;
BOOL result = FALSE;
long num_sects;
int i;
if (length < 1)
return -1;
if (length >= buflen) {
printk(LDM_ERR "String too long for buffer in get_vstr(): "
"(%d/%d). Truncating.\n", length, buflen);
length = buflen - 1;
BUG_ON (!bdev || !ph1);
ph[1] = kmalloc (sizeof (*ph[1]), GFP_KERNEL);
ph[2] = kmalloc (sizeof (*ph[2]), GFP_KERNEL);
if (!ph[1] || !ph[2]) {
ldm_crit ("Out of memory.");
goto out;
}
memcpy(buffer, block + 1, length);
buffer[length] = (u8)'\0';
return length;
/* off[1 & 2] are relative to ph[0]->config_start */
ph[0]->config_start = 0;
/* Read and parse privheads */
for (i = 0; i < 3; i++) {
data = read_dev_sector (bdev,
ph[0]->config_start + off[i], &sect);
if (!data) {
ldm_crit ("Disk read failed.");
goto out;
}
result = ldm_parse_privhead (data, ph[i]);
put_dev_sector (sect);
if (!result) {
ldm_error ("Cannot find PRIVHEAD %d.", i+1); /* Log again */
if (i < 2)
goto out; /* Already logged */
else
break; /* FIXME ignore for now, 3rd PH can fail on odd-sized disks */
}
}
num_sects = bdev->bd_inode->i_size >> 9;
if ((ph[0]->config_start > num_sects) ||
((ph[0]->config_start + ph[0]->config_size) > num_sects)) {
ldm_crit ("Database extends beyond the end of the disk.");
goto out;
}
if ((ph[0]->logical_disk_start > ph[0]->config_start) ||
((ph[0]->logical_disk_start + ph[0]->logical_disk_size)
> ph[0]->config_start)) {
ldm_crit ("Disk and database overlap.");
goto out;
}
if (!ldm_compare_privheads (ph[0], ph[1])) {
ldm_crit ("Primary and backup PRIVHEADs don't match.");
goto out;
}
/* FIXME ignore this for now
if (!ldm_compare_privheads (ph[0], ph[2])) {
ldm_crit ("Primary and backup PRIVHEADs don't match.");
goto out;
}*/
ldm_debug ("Validated PRIVHEADs successfully.");
result = TRUE;
out:
kfree (ph[1]);
kfree (ph[2]);
return result;
}
/**
* get_disk_objid - obtain the object id for the device we are working on
* @dev: partition device holding the LDM database
* @vm: in memory vmdb structure of the LDM database
* @ph: in memory privhead structure of the device we are working on
* @dk: in memory ldmdisk structure to return information into
* ldm_validate_tocblocks - Validate the table of contents and its backups
* @bdev: Device holding the LDM Database
* @base: Offset, into @bdev, of the database
* @ldb: Cache of the database structures
*
* This obtains the object id for the device we are working on as defined by
* the private header @ph. The obtained object id, together with the disk's
* GUID from @ph are returned in the ldmdisk structure pointed to by @dk.
* Find and compare the four tables of contents of the LDM Database stored on
* @bdev and return the parsed information into @toc1.
*
* A Disk has two Ids. The main one is a GUID in string format. The second,
* used internally for cross-referencing, is a small, sequentially allocated,
* number. The PRIVHEAD, just after the partition table, tells us the disk's
* GUID. To find the disk's object id, we have to look through the database.
* The offsets and sizes of the configs are range-checked against a privhead.
*
* Return 1 on success and -1 on error, in which case @dk is undefined.
* Return: TRUE @toc1 contains validated TOCBLOCK info
* FALSE @toc1 contents are undefined
*/
static int get_disk_objid(struct block_device *bdev, const struct vmdb *vm,
const struct privhead *ph, struct ldmdisk *dk,
unsigned long base)
static BOOL ldm_validate_tocblocks (struct block_device *bdev,
unsigned long base, struct ldmdb *ldb)
{
static const int off[4] = { OFF_TOCB1, OFF_TOCB2, OFF_TOCB3, OFF_TOCB4};
struct tocblock *tb[4];
struct privhead *ph;
Sector sect;
unsigned char *data;
u8 *disk_id;
int vblk;
int vsize; /* VBLK size. */
int perbuf; /* VBLKs per buffer. */
int buffer, lastbuf, lastofs, err;
disk_id = (u8*)kmalloc(DISK_ID_SIZE, GFP_KERNEL);
if (!disk_id)
goto no_mem;
vsize = vm->vblk_size;
if (vsize < 1 || vsize > 512)
goto err_out;
perbuf = 512 / vsize;
if (perbuf < 1 || 512 % vsize)
goto err_out;
/* 512 == VMDB size */
lastbuf = vm->last_vblk_seq / perbuf - 1;
lastofs = vm->last_vblk_seq % perbuf;
if (lastofs)
lastbuf++;
if (OFF_VBLK * LDM_BLOCKSIZE + vm->last_vblk_seq * vsize >
ph->config_size * 512)
goto err_out;
for (buffer = 0; buffer < lastbuf; buffer++) {
data = read_dev_sector(bdev, base + 2*OFF_VBLK + buffer, &sect);
if (!data)
goto read_err;
for (vblk = 0; vblk < perbuf; vblk++) {
int rel_objid, rel_name, delta;
u8 *block;
if (lastofs && buffer == lastbuf - 1 && vblk >= lastofs)
break;
block = data + vblk * vsize;
delta = vblk * vsize + 0x18;
if (delta >= 512)
goto brelse_out;
if (block[0x0D] != 0) /* Extended VBLK, ignore */
continue;
if ((block[0x13] != VBLK_DSK1) &&
(block[0x13] != VBLK_DSK2))
continue;
/* Calculate relative offsets. */
rel_objid = 1 + block[0x18];
if (delta + rel_objid >= 512)
goto brelse_out;
rel_name = 1 + block[0x18 + rel_objid] + rel_objid;
if (delta + rel_name >= 512 ||
delta + rel_name + block[0x18 + rel_name] >= 512)
goto brelse_out;
err = get_vstr(block + 0x18 + rel_name, disk_id,
DISK_ID_SIZE);
if (err == -1)
goto brelse_out;
if (!strncmp(disk_id, ph->disk_id, DISK_ID_SIZE)) {
dk->obj_id = get_vnum(block + 0x18, &err);
put_dev_sector(sect);
if (err)
u8 *data;
BOOL result = FALSE;
int i;
BUG_ON (!bdev || !ldb);
ph = &ldb->ph;
tb[0] = &ldb->toc;
tb[1] = kmalloc (sizeof (*tb[1]), GFP_KERNEL);
tb[2] = kmalloc (sizeof (*tb[2]), GFP_KERNEL);
tb[3] = kmalloc (sizeof (*tb[3]), GFP_KERNEL);
if (!tb[1] || !tb[2] || !tb[3]) {
ldm_crit ("Out of memory.");
goto out;
strncpy(dk->disk_id, ph->disk_id,
sizeof(dk->disk_id));
dk->disk_id[sizeof(dk->disk_id) - 1] = (u8)'\0';
err = 1;
}
for (i = 0; i < 4; i++) /* Read and parse all four toc's. */
{
data = read_dev_sector (bdev, base + off[i], &sect);
if (!data) {
ldm_crit ("Disk read failed.");
goto out;
}
result = ldm_parse_tocblock (data, tb[i]);
put_dev_sector (sect);
if (!result)
goto out; /* Already logged */
}
put_dev_sector(sect);
/* Range check the toc against a privhead. */
if (((tb[0]->bitmap1_start + tb[0]->bitmap1_size) > ph->config_size) ||
((tb[0]->bitmap2_start + tb[0]->bitmap2_size) > ph->config_size)) {
ldm_crit ("The bitmaps are out of range. Giving up.");
goto out;
}
err = -1;
out:
kfree(disk_id);
return err;
brelse_out:
put_dev_sector(sect);
goto err_out;
no_mem:
printk(LDM_CRIT "Not enough memory to allocate required buffers.\n");
goto err_out;
read_err:
printk(LDM_CRIT "Disk read failed in get_disk_objid.\n");
err_out:
err = -1;
if (!ldm_compare_tocblocks (tb[0], tb[1]) || /* Compare all tocs. */
!ldm_compare_tocblocks (tb[0], tb[2]) ||
!ldm_compare_tocblocks (tb[0], tb[3])) {
ldm_crit ("The TOCBLOCKs don't match.");
goto out;
}
ldm_debug ("Validated TOCBLOCKs successfully.");
result = TRUE;
out:
kfree (tb[1]);
kfree (tb[2]);
kfree (tb[3]);
return result;
}
/**
* parse_vmdb - parse the LDM database vmdb structure
* @buffer: LDM database vmdb structure loaded from the device
* @vm: in memory vmdb structure to return parsed information in
*
* This parses the LDM database vmdb structure supplied in @buffer and sets up
* the in memory vmdb structure @vm with the obtained information.
* ldm_validate_vmdb - Read the VMDB and validate it
* @bdev: Device holding the LDM Database
* @base: Offset, into @bdev, of the database
* @ldb: Cache of the database structures
*
* Return 1 on success and -1 on error, in which case @vm is undefined.
* Find the vmdb of the LDM Database stored on @bdev and return the parsed
* information in @ldb.
*
* NOTE: The *_start, *_size and *_seq values returned in @vm have not been
* checked for validity, so make sure to check them when using them.
* Return: TRUE @ldb contains validated VBDB info
* FALSE @ldb contents are undefined
*/
static int parse_vmdb(const u8 *buffer, struct vmdb *vm)
static BOOL ldm_validate_vmdb (struct block_device *bdev, unsigned long base,
struct ldmdb *ldb)
{
if (MAGIC_VMDB != BE32(buffer)) {
printk(LDM_CRIT "Cannot find VMDB, database may be corrupt.\n");
return -1;
Sector sect;
u8 *data;
BOOL result = FALSE;
struct vmdb *vm;
struct tocblock *toc;
BUG_ON (!bdev || !ldb);
vm = &ldb->vm;
toc = &ldb->toc;
data = read_dev_sector (bdev, base + OFF_VMDB, &sect);
if (!data) {
ldm_crit ("Disk read failed.");
return FALSE;
}
vm->ver_major = BE16(buffer + 0x12);
vm->ver_minor = BE16(buffer + 0x14);
if ((vm->ver_major != 4) || (vm->ver_minor != 10)) {
printk(LDM_ERR "Expected VMDB version %d.%d, got %d.%d. "
"Aborting.\n", 4, 10, vm->ver_major,
vm->ver_minor);
return -1;
if (!ldm_parse_vmdb (data, vm))
goto out; /* Already logged */
/* Are there uncommitted transactions? */
if (BE16(data + 0x10) != 0x01) {
ldm_crit ("Database is not in a consistant state. Aborting.");
goto out;
}
vm->vblk_size = BE32(buffer + 0x08);
vm->vblk_offset = BE32(buffer + 0x0C);
vm->last_vblk_seq = BE32(buffer + 0x04);
ldm_debug("Parsed VMDB successfully.\n");
return 1;
if (vm->vblk_offset != 512)
ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
/* FIXME: How should we handle this situation? */
if ((vm->vblk_size * vm->last_vblk_seq) != (toc->bitmap1_size << 9))
ldm_info ("VMDB and TOCBLOCK don't agree on the database size.");
result = TRUE;
out:
put_dev_sector (sect);
return result;
}
/**
* validate_vmdb - validate the vmdb
* @dev: partition device holding the LDM database
* @vm: in memory vmdb in which to return information
* ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
* @bdev: Device holding the LDM Database
*
* This function provides a weak test to decide whether the device is a dynamic
* disk or not. It looks for an MS-DOS-style partition table containing at
* least one partition of type 0x42 (formerly SFS, now used by Windows for
* dynamic disks).
*
* Find the vmdb of the LDM database stored on @dev and return the parsed
* information into @vm.
* N.B. The only possible error can come from the read_dev_sector and that is
* only likely to happen if the underlying device is strange. If that IS
* the case we should return zero to let someone else try.
*
* Return 1 on success and -1 on error, in which case @vm is undefined.
* Return: TRUE @bdev is a dynamic disk
* FALSE @bdev is not a dynamic disk, or an error occurred
*/
static int validate_vmdb(struct block_device *bdev, struct vmdb *vm, unsigned long base)
static BOOL ldm_validate_partition_table (struct block_device *bdev)
{
Sector sect;
unsigned char *data;
int ret;
u8 *data;
struct partition *p;
int i;
BOOL result = FALSE;
data = read_dev_sector(bdev, base + OFF_VMDB * 2 + 1, &sect);
BUG_ON (!bdev);
data = read_dev_sector (bdev, 0, &sect);
if (!data) {
printk(LDM_CRIT "Disk read failed in validate_vmdb.\n");
return -1;
ldm_crit ("Disk read failed.");
return FALSE;
}
if (*(u16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC)) {
ldm_debug ("No MS-DOS partition table found.");
goto out;
}
p = (struct partition*)(data + 0x01BE);
for (i = 0; i < 4; i++, p++)
if (SYS_IND (p) == WIN2K_DYNAMIC_PARTITION) {
result = TRUE;
break;
}
ret = parse_vmdb(data, vm);
put_dev_sector(sect);
return ret;
if (result)
ldm_debug ("Parsed partition table successfully.");
else
ldm_debug ("Found an MS-DOS partition table, not a dynamic disk.");
out:
put_dev_sector (sect);
return result;
}
/**
* compare_tocblocks - compare two tables of contents
* @toc1: first toc
* @toc2: second toc
* ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
* @ldb: Cache of the database structures
*
* This compares the two tables of contents @toc1 and @toc2.
* The LDM Database contains a list of all partitions on all dynamic disks. The
* primary PRIVHEAD, at the beginning of the physical disk, tells us the GUID of
* this disk. This function searches for the GUID in a linked list of vblk's.
*
* Return 1 if @toc1 and @toc2 are equal and -1 otherwise.
* Return: Pointer, A matching vblk was found
* NULL, No match, or an error
*/
static int compare_tocblocks(const struct tocblock *toc1,
const struct tocblock *toc2)
static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
{
if ((toc1->bitmap1_start == toc2->bitmap1_start) &&
(toc1->bitmap1_size == toc2->bitmap1_size) &&
(toc1->bitmap2_start == toc2->bitmap2_start) &&
(toc1->bitmap2_size == toc2->bitmap2_size) &&
!strncmp(toc1->bitmap1_name, toc2->bitmap1_name,
sizeof(toc1->bitmap1_name)) &&
!strncmp(toc1->bitmap2_name, toc2->bitmap2_name,
sizeof(toc1->bitmap2_name)))
return 1;
return -1;
struct list_head *item;
BUG_ON (!ldb);
list_for_each (item, &ldb->v_disk) {
struct vblk *v = list_entry (item, struct vblk, list);
if (!memcmp (v->vblk.disk.disk_id, ldb->ph.disk_id, GUID_SIZE))
return v;
}
return NULL;
}
/**
* parse_tocblock - parse the LDM database table of contents structure
* @buffer: LDM database toc structure loaded from the device
* @toc: in memory toc structure to return parsed information in
* ldm_create_data_partitions - Create data partitions for this device
* @pp: List of the partitions parsed so far
* @ldb: Cache of the database structures
*
* This parses the LDM database table of contents structure supplied in @buffer
* and sets up the in memory table of contents structure @toc with the obtained
* information.
* The database contains ALL the partitions for ALL disk groups, so we need to
* filter out this specific disk. Using the disk's object id, we can find all
* the partitions in the database that belong to this disk.
*
* Add each partition in our database, to the parsed_partitions structure.
*
* Return 1 on success and -1 on error, in which case @toc is undefined.
* N.B. This function creates the partitions in the order it finds partition
* objects in the linked list.
*
* FIXME: The *_start and *_size values returned in @toc are not been checked
* for validity but as we don't use the actual values for anything other than
* comparing between the toc and its backups, the values are not important.
* Return: TRUE Partition created
* FALSE Error, probably a range checking problem
*/
static int parse_tocblock(const u8 *buffer, struct tocblock *toc)
static BOOL ldm_create_data_partitions (struct parsed_partitions *pp,
const struct ldmdb *ldb)
{
if (MAGIC_TOCBLOCK != BE64(buffer)) {
printk(LDM_CRIT "Cannot find TOCBLOCK, database may be "
"corrupt.\n");
return -1;
struct list_head *item;
struct vblk *vb;
struct vblk *disk;
struct vblk_part *part;
int part_num = 1;
BUG_ON (!pp || !ldb);
disk = ldm_get_disk_objid (ldb);
if (!disk) {
ldm_crit ("Can't find the ID of this disk in the database.");
return FALSE;
}
strncpy(toc->bitmap1_name, buffer + 0x24, sizeof(toc->bitmap1_name));
toc->bitmap1_name[sizeof(toc->bitmap1_name) - 1] = (u8)'\0';
toc->bitmap1_start = BE64(buffer + 0x2E);
toc->bitmap1_size = BE64(buffer + 0x36);
/*toc->bitmap1_flags = BE64(buffer + 0x3E);*/
if (strncmp(toc->bitmap1_name, TOC_BITMAP1,
sizeof(toc->bitmap1_name)) != 0) {
printk(LDM_CRIT "TOCBLOCK's first bitmap should be %s, but is "
"%s.\n", TOC_BITMAP1, toc->bitmap1_name);
return -1;
printk (" [LDM]");
/* Create the data partitions */
list_for_each (item, &ldb->v_part) {
vb = list_entry (item, struct vblk, list);
part = &vb->vblk.part;
if (part->disk_id != disk->obj_id)
continue;
put_partition (pp, part_num, ldb->ph.logical_disk_start +
part->start, part->size);
part_num++;
}
strncpy(toc->bitmap2_name, buffer + 0x46, sizeof(toc->bitmap2_name));
toc->bitmap2_name[sizeof(toc->bitmap2_name) - 1] = (u8)'\0';
toc->bitmap2_start = BE64(buffer + 0x50);
toc->bitmap2_size = BE64(buffer + 0x58);
/*toc->bitmap2_flags = BE64(buffer + 0x60);*/
if (strncmp(toc->bitmap2_name, TOC_BITMAP2,
sizeof(toc->bitmap2_name)) != 0) {
printk(LDM_CRIT "TOCBLOCK's second bitmap should be %s, but is "
"%s.\n", TOC_BITMAP2, toc->bitmap2_name);
printk ("\n");
return TRUE;
}
/**
* ldm_relative - Calculate the next relative offset
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @base: Size of the previous fixed width fields
* @offset: Cumulative size of the previous variable-width fields
*
* Because many of the VBLK fields are variable-width, it's necessary
* to calculate each offset based on the previous one and the length
* of the field it pointed to.
*
* Return: -1 Error, the calculated offset exceeded the size of the buffer
* n OK, a range-checked offset into buffer
*/
static int ldm_relative (const u8 *buffer, int buflen, int base, int offset)
{
base += offset;
if ((!buffer) || (offset < 0) || (base > buflen))
return -1;
}
ldm_debug("Parsed TOCBLOCK successfully.\n");
return 1;
if ((base + buffer[base]) >= buflen)
return -1;
return buffer[base] + offset + 1;
}
/**
* validate_tocblocks - validate the table of contents and its backups
* @dev: partition device holding the LDM database
* @toc1: in memory table of contents in which to return information
* ldm_get_vnum - Convert a variable-width, big endian number, into cpu order
* @block: Pointer to the variable-width number to convert
*
* Large numbers in the LDM Database are often stored in a packed format. Each
* number is prefixed by a one byte width marker. All numbers in the database
* are stored in big-endian byte order. This function reads one of these
* numbers and returns the result
*
* Find and compare the four tables of contents of the LDM database stored on
* @dev and return the parsed information into @toc1.
* N.B. This function DOES NOT perform any range checking, though the most
* it will read is eight bytes.
*
* Return 1 on success and -1 on error, in which case @toc1 is undefined.
* Return: n A number
* 0 Zero, or an error occurred
*/
static int validate_tocblocks(struct block_device *bdev,
struct tocblock *toc1,
unsigned long base)
static u64 ldm_get_vnum (const u8 *block)
{
Sector sect;
unsigned char *data;
struct tocblock *toc2 = NULL, *toc3 = NULL, *toc4 = NULL;
int err;
toc2 = (struct tocblock*)kmalloc(sizeof(*toc2), GFP_KERNEL);
if (!toc2)
goto no_mem;
toc3 = (struct tocblock*)kmalloc(sizeof(*toc3), GFP_KERNEL);
if (!toc3)
goto no_mem;
toc4 = (struct tocblock*)kmalloc(sizeof(*toc4), GFP_KERNEL);
if (!toc4)
goto no_mem;
/* Read and parse first toc. */
data = read_dev_sector(bdev, base + OFF_TOCBLOCK1 * 2 + 1, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 1 failed in validate_tocblocks.\n");
goto err_out;
}
err = parse_tocblock(data, toc1);
put_dev_sector(sect);
if (err != 1)
goto out;
/* Read and parse second toc. */
data = read_dev_sector(bdev, base + OFF_TOCBLOCK2 * 2, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 2 failed in validate_tocblocks.\n");
goto err_out;
u64 tmp = 0;
u8 length;
BUG_ON (!block);
length = *block++;
if (length && length <= 8)
while (length--)
tmp = (tmp << 8) | *block++;
else
ldm_error ("Illegal length %d.", length);
return tmp;
}
/**
* ldm_get_vstr - Read a length-prefixed string into a buffer
* @block: Pointer to the length marker
* @buffer: Location to copy string to
* @buflen: Size of the output buffer
*
* Many of the strings in the LDM Database are not NULL terminated. Instead
* they are prefixed by a one byte length marker. This function copies one of
* these strings into a buffer.
*
* N.B. This function DOES NOT perform any range checking on the input.
* If the buffer is too small, the output will be truncated.
*
* Return: 0, Error and @buffer contents are undefined
* n, String length in characters (excluding NULL)
* buflen-1, String was truncated.
*/
static int ldm_get_vstr (const u8 *block, u8 *buffer, int buflen)
{
int length;
BUG_ON (!block || !buffer);
length = block[0];
if (length >= buflen) {
ldm_error ("Truncating string %d -> %d.", length, buflen);
length = buflen - 1;
}
err = parse_tocblock(data, toc2);
put_dev_sector(sect);
if (err != 1)
goto out;
/* Read and parse third toc. */
data = read_dev_sector(bdev, base + OFF_TOCBLOCK3 * 2 + 1, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 3 failed in validate_tocblocks.\n");
goto err_out;
memcpy (buffer, block + 1, length);
buffer[length] = 0;
return length;
}
/**
* ldm_parse_cmp3 - Read a raw VBLK Component object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Component object (version 3) into a vblk structure.
*
* Return: TRUE @vb contains a Component VBLK
* FALSE @vb contents are not defined
*/
static BOOL ldm_parse_cmp3 (const u8 *buffer, int buflen, struct vblk *vb)
{
int r_objid, r_name, r_vstate, r_child, r_parent, r_stripe, r_cols, len;
struct vblk_comp *comp;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
r_vstate = ldm_relative (buffer, buflen, 0x18, r_name);
r_child = ldm_relative (buffer, buflen, 0x1D, r_vstate);
r_parent = ldm_relative (buffer, buflen, 0x2D, r_child);
if (buffer[0x12] & VBLK_FLAG_COMP_STRIPE) {
r_stripe = ldm_relative (buffer, buflen, 0x2E, r_parent);
r_cols = ldm_relative (buffer, buflen, 0x2E, r_stripe);
len = r_cols;
} else {
r_stripe = 0;
r_cols = 0;
len = r_parent;
}
err = parse_tocblock(data, toc3);
put_dev_sector(sect);
if (err != 1)
goto out;
/* Read and parse fourth toc. */
data = read_dev_sector(bdev, base + OFF_TOCBLOCK4 * 2, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 4 failed in validate_tocblocks.\n");
goto err_out;
if (len < 0)
return FALSE;
len += VBLK_SIZE_CMP3;
if (len != BE32 (buffer + 0x14))
return FALSE;
comp = &vb->vblk.comp;
ldm_get_vstr (buffer + 0x18 + r_name, comp->state,
sizeof (comp->state));
comp->type = buffer[0x18 + r_vstate];
comp->children = ldm_get_vnum (buffer + 0x1D + r_vstate);
comp->parent_id = ldm_get_vnum (buffer + 0x2D + r_child);
comp->chunksize = r_stripe ? ldm_get_vnum (buffer+r_parent+0x2E) : 0;
return TRUE;
}
/**
* ldm_parse_dgr3 - Read a raw VBLK Disk Group object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Disk Group object (version 3) into a vblk structure.
*
* Return: TRUE @vb contains a Disk Group VBLK
* FALSE @vb contents are not defined
*/
static int ldm_parse_dgr3 (const u8 *buffer, int buflen, struct vblk *vb)
{
int r_objid, r_name, r_diskid, r_id1, r_id2, len;
struct vblk_dgrp *dgrp;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
if (buffer[0x12] & VBLK_FLAG_DGR3_IDS) {
r_id1 = ldm_relative (buffer, buflen, 0x24, r_diskid);
r_id2 = ldm_relative (buffer, buflen, 0x24, r_id1);
len = r_id2;
} else {
r_id1 = 0;
r_id2 = 0;
len = r_diskid;
}
err = parse_tocblock(data, toc4);
put_dev_sector(sect);
if (err != 1)
goto out;
/* Compare all tocs. */
err = compare_tocblocks(toc1, toc2);
if (err != 1) {
printk(LDM_CRIT "First and second TOCBLOCKs don't match.\n");
goto out;
if (len < 0)
return FALSE;
len += VBLK_SIZE_DGR3;
if (len != BE32 (buffer + 0x14))
return FALSE;
dgrp = &vb->vblk.dgrp;
ldm_get_vstr (buffer + 0x18 + r_name, dgrp->disk_id,
sizeof (dgrp->disk_id));
return TRUE;
}
/**
* ldm_parse_dgr4 - Read a raw VBLK Disk Group object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Disk Group object (version 4) into a vblk structure.
*
* Return: TRUE @vb contains a Disk Group VBLK
* FALSE @vb contents are not defined
*/
static BOOL ldm_parse_dgr4 (const u8 *buffer, int buflen, struct vblk *vb)
{
char buf[64];
int r_objid, r_name, r_id1, r_id2, len;
struct vblk_dgrp *dgrp;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
if (buffer[0x12] & VBLK_FLAG_DGR4_IDS) {
r_id1 = ldm_relative (buffer, buflen, 0x44, r_name);
r_id2 = ldm_relative (buffer, buflen, 0x44, r_id1);
len = r_id2;
} else {
r_id1 = 0;
r_id2 = 0;
len = r_name;
}
err = compare_tocblocks(toc3, toc4);
if (err != 1) {
printk(LDM_CRIT "Third and fourth TOCBLOCKs don't match.\n");
goto out;
if (len < 0)
return FALSE;
len += VBLK_SIZE_DGR4;
if (len != BE32 (buffer + 0x14))
return FALSE;
dgrp = &vb->vblk.dgrp;
ldm_get_vstr (buffer + 0x18 + r_objid, buf, sizeof (buf));
return TRUE;
}
/**
* ldm_parse_dsk3 - Read a raw VBLK Disk object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Disk object (version 3) into a vblk structure.
*
* Return: TRUE @vb contains a Disk VBLK
* FALSE @vb contents are not defined
*/
static BOOL ldm_parse_dsk3 (const u8 *buffer, int buflen, struct vblk *vb)
{
int r_objid, r_name, r_diskid, r_altname, len;
struct vblk_disk *disk;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
r_diskid = ldm_relative (buffer, buflen, 0x18, r_name);
r_altname = ldm_relative (buffer, buflen, 0x18, r_diskid);
len = r_altname;
if (len < 0)
return FALSE;
len += VBLK_SIZE_DSK3;
if (len != BE32 (buffer + 0x14))
return FALSE;
disk = &vb->vblk.disk;
ldm_get_vstr (buffer + 0x18 + r_diskid, disk->alt_name,
sizeof (disk->alt_name));
if (!ldm_parse_guid (buffer + 0x19 + r_name, disk->disk_id))
return FALSE;
return TRUE;
}
/**
* ldm_parse_dsk4 - Read a raw VBLK Disk object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Disk object (version 4) into a vblk structure.
*
* Return: TRUE @vb contains a Disk VBLK
* FALSE @vb contents are not defined
*/
static BOOL ldm_parse_dsk4 (const u8 *buffer, int buflen, struct vblk *vb)
{
int r_objid, r_name, len;
struct vblk_disk *disk;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
len = r_name;
if (len < 0)
return FALSE;
len += VBLK_SIZE_DSK4;
if (len != BE32 (buffer + 0x14))
return FALSE;
disk = &vb->vblk.disk;
memcpy (disk->disk_id, buffer + 0x18 + r_name, GUID_SIZE);
return TRUE;
}
/**
* ldm_parse_prt3 - Read a raw VBLK Partition object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* Read a raw VBLK Partition object (version 3) into a vblk structure.
*
* Return: TRUE @vb contains a Partition VBLK
* FALSE @vb contents are not defined
*/
static BOOL ldm_parse_prt3 (const u8 *buffer, int buflen, struct vblk *vb)
{
int r_objid, r_name, r_size, r_parent, r_diskid, r_index, len;
struct vblk_part *part;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
r_size = ldm_relative (buffer, buflen, 0x34, r_name);
r_parent = ldm_relative (buffer, buflen, 0x34, r_size);
r_diskid = ldm_relative (buffer, buflen, 0x34, r_parent);
if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
r_index = ldm_relative (buffer, buflen, 0x34, r_diskid);
len = r_index;
} else {
r_index = 0;
len = r_diskid;
}
err = compare_tocblocks(toc1, toc3);
if (err != 1)
printk(LDM_CRIT "First and third TOCBLOCKs don't match.\n");
if (len < 0)
return FALSE;
len += VBLK_SIZE_PRT3;
if (len != BE32 (buffer + 0x14))
return FALSE;
part = &vb->vblk.part;
part->start = BE64 (buffer + 0x24 + r_name);
part->volume_offset = BE64 (buffer + 0x2C + r_name);
part->size = ldm_get_vnum (buffer + 0x34 + r_name);
part->parent_id = ldm_get_vnum (buffer + 0x34 + r_size);
part->disk_id = ldm_get_vnum (buffer + 0x34 + r_parent);
if (vb->flags & VBLK_FLAG_PART_INDEX)
part->partnum = buffer[0x35 + r_diskid];
else
ldm_debug("Validated TOCBLOCKs successfully.\n");
out:
kfree(toc2);
kfree(toc3);
kfree(toc4);
return err;
no_mem:
printk(LDM_CRIT "Not enough memory to allocate required buffers.\n");
err_out:
err = -1;
goto out;
part->partnum = 0;
return TRUE;
}
/**
* compare_privheads - compare two privheads
* @ph1: first privhead
* @ph2: second privhead
* ldm_parse_vol5 - Read a raw VBLK Volume object into a vblk structure
* @buffer: Block of data being worked on
* @buflen: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* This compares the two privheads @ph1 and @ph2.
* Read a raw VBLK Volume object (version 5) into a vblk structure.
*
* Return 1 if @ph1 and @ph2 are equal and -1 otherwise.
* Return: TRUE @vb contains a Volume VBLK
* FALSE @vb contents are not defined
*/
static int compare_privheads(const struct privhead *ph1,
const struct privhead *ph2)
static BOOL ldm_parse_vol5 (const u8 *buffer, int buflen, struct vblk *vb)
{
if ((ph1->ver_major == ph2->ver_major) &&
(ph1->ver_minor == ph2->ver_minor) &&
(ph1->logical_disk_start == ph2->logical_disk_start) &&
(ph1->logical_disk_size == ph2->logical_disk_size) &&
(ph1->config_start == ph2->config_start) &&
(ph1->config_size == ph2->config_size) &&
!strncmp(ph1->disk_id, ph2->disk_id, sizeof(ph1->disk_id)))
return 1;
return -1;
int r_objid, r_name, r_vtype, r_child, r_size, r_id1, r_id2, r_size2;
int r_drive, len;
struct vblk_volu *volu;
BUG_ON (!buffer || !vb);
r_objid = ldm_relative (buffer, buflen, 0x18, 0);
r_name = ldm_relative (buffer, buflen, 0x18, r_objid);
r_vtype = ldm_relative (buffer, buflen, 0x18, r_name);
r_child = ldm_relative (buffer, buflen, 0x2E, r_vtype);
r_size = ldm_relative (buffer, buflen, 0x3E, r_child);
if (buffer[0x12] & VBLK_FLAG_VOLU_ID1)
r_id1 = ldm_relative (buffer, buflen, 0x53, r_size);
else
r_id1 = r_size;
if (buffer[0x12] & VBLK_FLAG_VOLU_ID2)
r_id2 = ldm_relative (buffer, buflen, 0x53, r_id1);
else
r_id2 = r_id1;
if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE)
r_size2 = ldm_relative (buffer, buflen, 0x53, r_id2);
else
r_size2 = r_id2;
if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE)
r_drive = ldm_relative (buffer, buflen, 0x53, r_size2);
else
r_drive = r_size2;
len = r_drive;
if (len < 0)
return FALSE;
len += VBLK_SIZE_VOL5;
if (len != BE32 (buffer + 0x14))
return FALSE;
volu = &vb->vblk.volu;
ldm_get_vstr (buffer + 0x18 + r_name, volu->volume_type,
sizeof (volu->volume_type));
memcpy (volu->volume_state, buffer + 0x19 + r_vtype,
sizeof (volu->volume_state));
volu->size = ldm_get_vnum (buffer + 0x3E + r_child);
volu->partition_type = buffer[0x42 + r_size];
memcpy (volu->guid, buffer + 0x43 + r_size, sizeof (volu->guid));
if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
ldm_get_vstr (buffer + 0x53 + r_size, volu->drive_hint,
sizeof (volu->drive_hint));
}
return TRUE;
}
/**
* validate_privheads - compare the privhead backups to the first one
* @dev: partition device holding the LDM database
* @ph1: first privhead which we have already validated before
* ldm_parse_vblk - Read a raw VBLK object into a vblk structure
* @buf: Block of data being worked on
* @len: Size of the block of data
* @vb: In-memory vblk in which to return information
*
* We already have one privhead from the beginning of the disk.
* Now we compare the two other copies for safety.
* Read a raw VBLK object into a vblk structure. This function just reads the
* information common to all VBLK types, then delegates the rest of the work to
* helper functions: ldm_parse_*.
*
* Return 1 on succes and -1 on error.
* Return: TRUE @vb contains a VBLK
* FALSE @vb contents are not defined
*/
static int validate_privheads(struct block_device *bdev,
const struct privhead *ph1,
unsigned long base)
static BOOL ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
{
Sector sect;
unsigned char *data;
struct privhead *ph2 = NULL, *ph3 = NULL;
int err;
ph2 = (struct privhead*)kmalloc(sizeof(*ph2), GFP_KERNEL);
if (!ph2)
goto no_mem;
ph3 = (struct privhead*)kmalloc(sizeof(*ph3), GFP_KERNEL);
if (!ph3)
goto no_mem;
data = read_dev_sector(bdev, base + OFF_PRIVHEAD2 * 2, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 1 failed in validate_privheads.\n");
goto err_out;
}
err = parse_privhead(data, ph2);
put_dev_sector(sect);
if (err != 1)
goto out;
data = read_dev_sector(bdev, base + OFF_PRIVHEAD3 * 2 + 1, &sect);
if (!data) {
printk(LDM_CRIT "Disk read 2 failed in validate_privheads.\n");
goto err_out;
BOOL result = FALSE;
int r_objid;
BUG_ON (!buf || !vb);
r_objid = ldm_relative (buf, len, 0x18, 0);
if (r_objid < 0) {
ldm_error ("VBLK header is corrupt.");
return FALSE;
}
err = parse_privhead(data, ph3);
put_dev_sector(sect);
if (err != 1)
goto out;
err = compare_privheads(ph1, ph2);
if (err != 1) {
printk(LDM_CRIT "First and second PRIVHEADs don't match.\n");
goto out;
vb->flags = buf[0x12];
vb->type = buf[0x13];
vb->obj_id = ldm_get_vnum (buf + 0x18);
ldm_get_vstr (buf+0x18+r_objid, vb->name, sizeof (vb->name));
switch (vb->type) {
case VBLK_CMP3: result = ldm_parse_cmp3 (buf, len, vb); break;
case VBLK_DSK3: result = ldm_parse_dsk3 (buf, len, vb); break;
case VBLK_DSK4: result = ldm_parse_dsk4 (buf, len, vb); break;
case VBLK_DGR3: result = ldm_parse_dgr3 (buf, len, vb); break;
case VBLK_DGR4: result = ldm_parse_dgr4 (buf, len, vb); break;
case VBLK_PRT3: result = ldm_parse_prt3 (buf, len, vb); break;
case VBLK_VOL5: result = ldm_parse_vol5 (buf, len, vb); break;
}
err = compare_privheads(ph1, ph3);
if (err != 1)
printk(LDM_CRIT "First and third PRIVHEADs don't match.\n");
if (result)
ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
(unsigned long long) vb->obj_id, vb->type);
else
/* We _could_ have checked more. */
ldm_debug("Validated PRIVHEADs successfully.\n");
out:
kfree(ph2);
kfree(ph3);
return err;
no_mem:
printk(LDM_CRIT "Not enough memory to allocate required buffers.\n");
err_out:
err = -1;
goto out;
ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
(unsigned long long) vb->obj_id, vb->type);
return result;
}
/**
* parse_privhead - parse the LDM database PRIVHEAD structure
* @buffer: LDM database privhead structure loaded from the device
* @ph: in memory privhead structure to return parsed information in
* ldm_ldmdb_add - Adds a raw VBLK entry to the ldmdb database
* @data: Raw VBLK to add to the database
* @len: Size of the raw VBLK
* @ldb: Cache of the database structures
*
* The VBLKs are sorted into categories. Partitions are also sorted by offset.
*
* This parses the LDM database PRIVHEAD structure supplied in @buffer and
* sets up the in memory privhead structure @ph with the obtained information.
* N.B. This function does not check the validity of the VBLKs.
*
* Return 1 on succes and -1 on error, in which case @ph is undefined.
* Return: TRUE The VBLK was added
* FALSE An error occurred
*/
static int parse_privhead(const u8 *buffer, struct privhead *ph)
static BOOL ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
{
if (MAGIC_PRIVHEAD != BE64(buffer)) {
printk(LDM_ERR "Cannot find PRIVHEAD structure. LDM database "
"is corrupt. Aborting.\n");
return -1;
struct vblk *vb;
struct list_head *item;
BUG_ON (!data || !ldb);
vb = kmalloc (sizeof (*vb), GFP_KERNEL);
if (!vb) {
ldm_crit ("Out of memory.");
return FALSE;
}
ph->ver_major = BE16(buffer + 0x000C);
ph->ver_minor = BE16(buffer + 0x000E);
if ((ph->ver_major != 2) || (ph->ver_minor != 11)) {
printk(LDM_ERR "Expected PRIVHEAD version %d.%d, got %d.%d. "
"Aborting.\n", 2, 11, ph->ver_major,
ph->ver_minor);
return -1;
if (!ldm_parse_vblk (data, len, vb))
return FALSE; /* Already logged */
/* Put vblk into the correct list. */
switch (vb->type) {
case VBLK_DGR3:
case VBLK_DGR4:
list_add (&vb->list, &ldb->v_dgrp);
break;
case VBLK_DSK3:
case VBLK_DSK4:
list_add (&vb->list, &ldb->v_disk);
break;
case VBLK_VOL5:
list_add (&vb->list, &ldb->v_volu);
break;
case VBLK_CMP3:
list_add (&vb->list, &ldb->v_comp);
break;
case VBLK_PRT3:
/* Sort by the partition's start sector. */
list_for_each (item, &ldb->v_part) {
struct vblk *v = list_entry (item, struct vblk, list);
if ((v->vblk.part.disk_id == vb->vblk.part.disk_id) &&
(v->vblk.part.start > vb->vblk.part.start)) {
list_add_tail (&vb->list, &v->list);
return TRUE;
}
ph->config_start = BE64(buffer + 0x012B);
ph->config_size = BE64(buffer + 0x0133);
if (ph->config_size != LDM_DB_SIZE) { /* 1 MiB in sectors. */
printk(LDM_ERR "Database should be %u bytes, claims to be %Lu "
"bytes. Aborting.\n", LDM_DB_SIZE,
ph->config_size);
return -1;
}
ph->logical_disk_start = BE64(buffer + 0x011B);
ph->logical_disk_size = BE64(buffer + 0x0123);
if (!ph->logical_disk_size ||
ph->logical_disk_start + ph->logical_disk_size > ph->config_start)
return -1;
list_add_tail (&vb->list, &ldb->v_part);
break;
}
return TRUE;
}
memcpy(ph->disk_id, buffer + 0x0030, sizeof(ph->disk_id));
/**
* ldm_frag_add - Add a VBLK fragment to a list
* @data: Raw fragment to be added to the list
* @size: Size of the raw fragment
* @frags: Linked list of VBLK fragments
*
* Fragmented VBLKs may not be consecutive in the database, so they are placed
* in a list so they can be pieced together later.
*
* Return: TRUE Success, the VBLK was added to the list
* FALSE Error, a problem occurred
*/
static BOOL ldm_frag_add (const u8 *data, int size, struct list_head *frags)
{
struct frag *f;
struct list_head *item;
int rec, num, group;
BUG_ON (!data || !frags);
group = BE32 (data + 0x08);
rec = BE16 (data + 0x0C);
num = BE16 (data + 0x0E);
if ((num < 1) || (num > 4)) {
ldm_error ("A VBLK claims to have %d parts.", num);
return FALSE;
}
list_for_each (item, frags) {
f = list_entry (item, struct frag, list);
if (f->group == group)
goto found;
}
f = kmalloc (sizeof (*f) + size*num, GFP_KERNEL);
if (!f) {
ldm_crit ("Out of memory.");
return FALSE;
}
f->group = group;
f->num = num;
f->rec = rec;
f->map = 0xFF << num;
list_add_tail (&f->list, frags);
found:
if (f->map & (1 << rec)) {
ldm_error ("Duplicate VBLK, part %d.", rec);
f->map &= 0x7F; /* Mark the group as broken */
return FALSE;
}
ldm_debug("Parsed PRIVHEAD successfully.\n");
return 1;
f->map |= (1 << rec);
if (num > 0) {
data += VBLK_SIZE_HEAD;
size -= VBLK_SIZE_HEAD;
}
memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
return TRUE;
}
/**
* find_db_partition - find our database
* @dev: device of which to create partition
* @ph: @dev's LDM database private header
* ldm_frag_free - Free a linked list of VBLK fragments
* @list: Linked list of fragments
*
* Find the primary private header and the LDM database
* partition to wrap it.
* Free a linked list of VBLK fragments
*
* Return 1 on succes, 0 if device is not a dynamic disk and -1 on error.
* Return: none
*/
static int find_db_partition(struct block_device *bdev, struct privhead *ph)
static void ldm_frag_free (struct list_head *list)
{
Sector sect;
unsigned char *data;
int err;
struct list_head *item, *tmp;
data = read_dev_sector(bdev, OFF_PRIVHEAD1*2, &sect);
if (!data) {
printk(LDM_CRIT __FUNCTION__ "(): Device read failed.\n");
return -1;
}
if (BE64(data) != MAGIC_PRIVHEAD) {
ldm_debug("Cannot find PRIVHEAD structure. Not a dynamic disk "
"or corrupt LDM database.\n");
return 0;
BUG_ON (!list);
list_for_each_safe (item, tmp, list)
kfree (list_entry (item, struct frag, list));
}
/**
* ldm_frag_commit - Validate fragmented VBLKs and add them to the database
* @frags: Linked list of VBLK fragments
* @ldb: Cache of the database structures
*
* Now that all the fragmented VBLKs have been collected, they must be added to
* the database for later use.
*
* Return: TRUE All the fragments we added successfully
* FALSE One or more of the fragments we invalid
*/
static BOOL ldm_frag_commit (struct list_head *frags, struct ldmdb *ldb)
{
struct frag *f;
struct list_head *item;
BUG_ON (!frags || !ldb);
list_for_each (item, frags) {
f = list_entry (item, struct frag, list);
if (f->map != 0xFF) {
ldm_error ("VBLK group %d is incomplete (0x%02x).",
f->group, f->map);
return FALSE;
}
err = parse_privhead(data, ph);
put_dev_sector(sect);
if (err <= 0)
return err;
if (ph->config_start < 1 ||
ph->config_start + ph->config_size > bdev->bd_inode->i_size >> 9) {
printk(LDM_CRIT "LDM Partition exceeds physical disk. "
"Aborting.\n");
err = -1;
if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
return FALSE; /* Already logged */
}
return err;
return TRUE;
}
/**
* validate_patition_table - check whether @dev is a dynamic disk
* @dev: device to test
* ldm_get_vblks - Read the on-disk database of VBLKs into memory
* @bdev: Device holding the LDM Database
* @base: Offset, into @bdev, of the database
* @ldb: Cache of the database structures
*
* Check whether @dev is a dynamic disk by looking for an MS-DOS-style partition
* table with one or more entries of type 0x42 (the former Secure File System
* (Landis) partition type, now recycled by Microsoft for dynamic disks) in it.
* If this succeeds we assume we have a dynamic disk, and not otherwise.
* To use the information from the VBLKs, they need to be read from the disk,
* unpacked and validated. We cache them in @ldb according to their type.
*
* Return 1 if @dev is a dynamic disk, 0 if not and -1 on error.
* Return: TRUE All the VBLKs were read successfully
* FALSE An error occurred
*/
static int validate_partition_table(struct block_device *bdev)
static BOOL ldm_get_vblks (struct block_device *bdev, unsigned long base,
struct ldmdb *ldb)
{
int size, perbuf, skip, finish, s, v, recs;
u8 *data = NULL;
Sector sect;
unsigned char *data;
struct partition *p;
int i, nr_sfs;
BOOL result = FALSE;
LIST_HEAD (frags);
data = read_dev_sector(bdev, 0, &sect);
if (!data)
return -1;
BUG_ON (!bdev || !ldb);
size = ldb->vm.vblk_size;
perbuf = 512 / size;
skip = ldb->vm.vblk_offset >> 9; /* Bytes to sectors */
finish = (size * ldb->vm.last_vblk_seq) >> 9;
if (*(u16*)(data + 0x01FE) != cpu_to_le16(MSDOS_LABEL_MAGIC)) {
ldm_debug("No MS-DOS partition found.\n");
goto no_msdos_partition;
for (s = skip; s < finish; s++) { /* For each sector */
data = read_dev_sector (bdev, base + OFF_VMDB + s, &sect);
if (!data) {
ldm_crit ("Disk read failed.");
goto out;
}
nr_sfs = 0;
p = (struct partition*)(data + 0x01BE);
for (i = 0; i < 4; i++) {
if (!SYS_IND(p+i) || SYS_IND(p+i) == WIN2K_EXTENDED_PARTITION)
continue;
if (SYS_IND(p+i) == WIN2K_DYNAMIC_PARTITION) {
nr_sfs++;
continue;
for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */
if (MAGIC_VBLK != BE32 (data)) {
ldm_error ("Expected to find a VBLK.");
goto out;
}
goto not_dynamic_disk;
}
if (!nr_sfs)
goto not_dynamic_disk;
ldm_debug("Parsed partition table successfully.\n");
put_dev_sector(sect);
return 1;
not_dynamic_disk:
// ldm_debug("Found basic MS-DOS partition, not a dynamic disk.\n");
no_msdos_partition:
put_dev_sector(sect);
return 0;
recs = BE16 (data + 0x0E); /* Number of records */
if (recs == 1) {
if (!ldm_ldmdb_add (data, size, ldb))
goto out; /* Already logged */
} else if (recs > 1) {
if (!ldm_frag_add (data, size, &frags))
goto out; /* Already logged */
}
/* else Record is not in use, ignore it. */
}
put_dev_sector (sect);
data = NULL;
}
result = ldm_frag_commit (&frags, ldb); /* Failures, already logged */
out:
if (data)
put_dev_sector (sect);
ldm_frag_free (&frags);
return result;
}
/**
* ldm_partition - find out whether a device is a dynamic disk and handle it
* @hd: gendisk structure in which to return the handled disk
* @dev: device we need to look at
* ldm_free_vblks - Free a linked list of vblk's
* @lh: Head of a linked list of struct vblk
*
* Free a list of vblk's and free the memory used to maintain the list.
*
* Description:
* Return: none
*/
static void ldm_free_vblks (struct list_head *lh)
{
struct list_head *item, *tmp;
BUG_ON (!lh);
list_for_each_safe (item, tmp, lh)
kfree (list_entry (item, struct vblk, list));
}
/**
* ldm_partition - Find out whether a device is a dynamic disk and handle it
* @pp: List of the partitions parsed so far
* @bdev: Device holding the LDM Database
*
* This determines whether the device @dev is a dynamic disk and if so creates
* This determines whether the device @bdev is a dynamic disk and if so creates
* the partitions necessary in the gendisk structure pointed to by @hd.
*
* We create a dummy device 1, which contains the LDM database, we skip
* devices 2-4 and then create each partition described by the LDM database
* in sequence as devices 5 and following. For example, if the device is hda,
* we would have: hda1: LDM database, hda2-4: nothing, hda5-following: the
* actual data containing partitions.
*
* Return values:
*
* 1 if @dev is a dynamic disk and we handled it,
* 0 if @dev is not a dynamic disk,
* -1 if an error occured.
*/
int ldm_partition(struct parsed_partitions *state, struct block_device *bdev)
{
struct privhead *ph = NULL;
struct tocblock *toc = NULL;
struct vmdb *vm = NULL;
struct ldmdisk *dk = NULL;
unsigned long db_first;
int err;
/* Check the partition table. */
err = validate_partition_table(bdev);
if (err != 1)
return err;
if (!(ph = (struct privhead*)kmalloc(sizeof(*ph), GFP_KERNEL)))
goto no_mem;
/* Create the LDM database device. */
err = find_db_partition(bdev, ph);
if (err != 1)
goto out;
db_first = ph->config_start;
put_partition(state, 1, db_first, ph->config_size);
/* Check the backup privheads. */
err = validate_privheads(bdev, ph, db_first);
if (err != 1)
goto out;
/* Check the table of contents and its backups. */
if (!(toc = (struct tocblock*)kmalloc(sizeof(*toc), GFP_KERNEL)))
goto no_mem;
err = validate_tocblocks(bdev, toc, db_first);
if (err != 1)
goto out;
/* Check the vmdb. */
if (!(vm = (struct vmdb*)kmalloc(sizeof(*vm), GFP_KERNEL)))
goto no_mem;
err = validate_vmdb(bdev, vm, db_first);
if (err != 1)
goto out;
/* Find the object id for @dev in the LDM database. */
if (!(dk = (struct ldmdisk*)kmalloc(sizeof(*dk), GFP_KERNEL)))
goto no_mem;
err = get_disk_objid(bdev, vm, ph, dk, db_first);
if (err != 1)
* We create a dummy device 1, which contains the LDM database, and then create
* each partition described by the LDM database in sequence as devices 2+. For
* example, if the device is hda, we would have: hda1: LDM database, hda2, hda3,
* and so on: the actual data containing partitions.
*
* Return: 1 Success, @bdev is a dynamic disk and we handled it
* 0 Success, @bdev is not a dynamic disk
* -1 An error occurred before enough information had been read
* Or @bdev is a dynamic disk, but it may be corrupted
*/
int ldm_partition (struct parsed_partitions *pp, struct block_device *bdev)
{
struct ldmdb *ldb;
unsigned long base;
int result = -1;
BUG_ON (!pp || !bdev);
/* Look for signs of a Dynamic Disk */
if (!ldm_validate_partition_table (bdev))
return 0;
ldb = kmalloc (sizeof (*ldb), GFP_KERNEL);
if (!ldb) {
ldm_crit ("Out of memory.");
goto out;
}
/* Parse and check privheads. */
if (!ldm_validate_privheads (bdev, &ldb->ph))
goto out; /* Already logged */
/* All further references are relative to base (database start). */
base = ldb->ph.config_start;
/* Parse and check tocs and vmdb. */
if (!ldm_validate_tocblocks (bdev, base, ldb) ||
!ldm_validate_vmdb (bdev, base, ldb))
goto out; /* Already logged */
/* Initialize vblk lists in ldmdb struct */
INIT_LIST_HEAD (&ldb->v_dgrp);
INIT_LIST_HEAD (&ldb->v_disk);
INIT_LIST_HEAD (&ldb->v_volu);
INIT_LIST_HEAD (&ldb->v_comp);
INIT_LIST_HEAD (&ldb->v_part);
if (!ldm_get_vblks (bdev, base, ldb)) {
ldm_crit ("Failed to read the VBLKs from the database.");
goto cleanup;
}
/* Finally, create the data partition devices. */
err = create_data_partitions(state, 1 + LDM_FIRST_PART_OFFSET,
bdev, vm, ph, dk, db_first);
if (err == 1)
ldm_debug("Parsed LDM database successfully.\n");
if (ldm_create_data_partitions (pp, ldb)) {
ldm_debug ("Parsed LDM database successfully.");
result = 1;
}
/* else Already logged */
cleanup:
ldm_free_vblks (&ldb->v_dgrp);
ldm_free_vblks (&ldb->v_disk);
ldm_free_vblks (&ldb->v_volu);
ldm_free_vblks (&ldb->v_comp);
ldm_free_vblks (&ldb->v_part);
out:
kfree(ph);
kfree(toc);
kfree(vm);
kfree(dk);
return err;
no_mem:
printk(LDM_CRIT "Not enough memory to allocate required buffers.\n");
err = -1;
goto out;
kfree (ldb);
return result;
}
fs/partitions/ldm.h
View file @ 4966a3c5
#ifndef _FS_PT_LDM_H_
#define _FS_PT_LDM_H_
/*
/**
* ldm - Part of the Linux-NTFS project.
*
* Copyright (C) 2001 Richard Russon <ldm@flatcap.org>
* Copyright (C) 2001 Anton Altaparmakov
* Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
* Copyright (C) 2001 Anton Altaparmakov <aia21@cantab.net>
* Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
*
* Documentation is available at http://linux-ntfs.sf.net/ldm
*
......@@ -23,16 +22,18 @@
* in the file COPYING); if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _FS_PT_LDM_H_
#define _FS_PT_LDM_H_
#include <linux/types.h>
#include <linux/list.h>
#include <linux/genhd.h>
#include <linux/fs.h>
#include <asm/unaligned.h>
#include <asm/byteorder.h>
#include <linux/genhd.h>
/* Borrowed from kernel.h. */
#define LDM_PREFIX "LDM: " /* Prefix our error messages with this. */
#define LDM_CRIT KERN_CRIT LDM_PREFIX /* critical conditions */
#define LDM_ERR KERN_ERR LDM_PREFIX /* error conditions */
#define LDM_DEBUG KERN_DEBUG LDM_PREFIX /* debug-level messages */
struct parsed_partitions;
/* Magic numbers in CPU format. */
#define MAGIC_VMDB 0x564D4442 /* VMDB */
......@@ -41,41 +42,58 @@
#define MAGIC_TOCBLOCK 0x544F43424C4F434B /* TOCBLOCK */
/* The defined vblk types. */
#define VBLK_COMP 0x32 /* Component */
#define VBLK_PART 0x33 /* Partition */
#define VBLK_DSK1 0x34 /* Disk */
#define VBLK_DSK2 0x44 /* Disk */
#define VBLK_DGR1 0x35 /* Disk Group */
#define VBLK_DGR2 0x45 /* Disk Group */
#define VBLK_VOLU 0x51 /* Volume */
#define VBLK_VOL5 0x51 /* Volume, version 5 */
#define VBLK_CMP3 0x32 /* Component, version 3 */
#define VBLK_PRT3 0x33 /* Partition, version 3 */
#define VBLK_DSK3 0x34 /* Disk, version 3 */
#define VBLK_DSK4 0x44 /* Disk, version 4 */
#define VBLK_DGR3 0x35 /* Disk Group, version 3 */
#define VBLK_DGR4 0x45 /* Disk Group, version 4 */
/* vblk flags indicating extra information will be present */
#define VBLK_FLAG_COMP_STRIPE 0x10
#define VBLK_FLAG_PART_INDEX 0x08
#define VBLK_FLAG_DGR3_IDS 0x08
#define VBLK_FLAG_DGR4_IDS 0x08
#define VBLK_FLAG_VOLU_ID1 0x08
#define VBLK_FLAG_VOLU_ID2 0x20
#define VBLK_FLAG_VOLU_SIZE 0x80
#define VBLK_FLAG_VOLU_DRIVE 0x02
/* size of a vblk's static parts */
#define VBLK_SIZE_HEAD 16
#define VBLK_SIZE_CMP3 22 /* Name and version */
#define VBLK_SIZE_DGR3 12
#define VBLK_SIZE_DGR4 44
#define VBLK_SIZE_DSK3 12
#define VBLK_SIZE_DSK4 45
#define VBLK_SIZE_PRT3 28
#define VBLK_SIZE_VOL5 59
/* component types */
#define COMP_STRIPE 0x01 /* Stripe-set */
#define COMP_BASIC 0x02 /* Basic disk */
#define COMP_RAID 0x03 /* Raid-set */
/* Other constants. */
#define LDM_BLOCKSIZE 1024 /* Size of block in bytes. */
#define LDM_DB_SIZE 2048 /* Size in sectors (= 1MiB). */
#define LDM_FIRST_PART_OFFSET 4 /* Add this to first_part_minor
to get to the first data
partition device minor. */
#define OFF_PRIVHEAD1 3 /* Offset of the first privhead
#define OFF_PRIV1 6 /* Offset of the first privhead
relative to the start of the
device in units of
LDM_BLOCKSIZE. */
device in sectors */
/* Offsets to structures within the LDM Database in units of LDM_BLOCKSIZE. */
#define OFF_PRIVHEAD2 928 /* Backup private headers. */
#define OFF_PRIVHEAD3 1023
/* Offsets to structures within the LDM Database in sectors. */
#define OFF_PRIV2 1856 /* Backup private headers. */
#define OFF_PRIV3 2047
#define OFF_TOCBLOCK1 0 /* Tables of contents. */
#define OFF_TOCBLOCK2 1
#define OFF_TOCBLOCK3 1022
#define OFF_TOCBLOCK4 1023
#define OFF_TOCB1 1 /* Tables of contents. */
#define OFF_TOCB2 2
#define OFF_TOCB3 2045
#define OFF_TOCB4 2046
#define OFF_VMDB 8 /* List of partitions. */
#define OFF_VBLK 9
#define OFF_VMDB 17 /* List of partitions. */
#define WIN2K_DYNAMIC_PARTITION 0x42 /* Formerly SFS (Landis). */
#define WIN2K_EXTENDED_PARTITION 0x05 /* A standard extended
partition. */
#define TOC_BITMAP1 "config" /* Names of the two defined */
#define TOC_BITMAP2 "log" /* bitmaps in the TOCBLOCK. */
......@@ -85,26 +103,21 @@
#define BE32(x) ((u32)be32_to_cpu(get_unaligned((u32*)(x))))
#define BE64(x) ((u64)be64_to_cpu(get_unaligned((u64*)(x))))
/* Borrowed from msdos.c. */
/* Borrowed from msdos.c */
#define SYS_IND(p) (get_unaligned(&(p)->sys_ind))
#define NR_SECTS(p) ({ __typeof__((p)->nr_sects) __a = \
get_unaligned(&(p)->nr_sects); \
le32_to_cpu(__a); \
})
#define START_SECT(p) ({ __typeof__((p)->start_sect) __a = \
get_unaligned(&(p)->start_sect);\
le32_to_cpu(__a); \
})
struct frag { /* VBLK Fragment handling */
struct list_head list;
u32 group;
u8 num; /* Total number of records */
u8 rec; /* This is record number n */
u8 map; /* Which portions are in use */
u8 data[0];
};
/* In memory LDM database structures. */
#define DISK_ID_SIZE 64 /* Size in bytes. */
struct ldmdisk {
u64 obj_id;
u8 disk_id[DISK_ID_SIZE];
};
#define GUID_SIZE 16
struct privhead { /* Offsets and sizes are in sectors. */
u16 ver_major;
......@@ -113,21 +126,19 @@ struct privhead { /* Offsets and sizes are in sectors. */
u64 logical_disk_size;
u64 config_start;
u64 config_size;
u8 disk_id[DISK_ID_SIZE];
u8 disk_id[GUID_SIZE];
};
struct tocblock { /* We have exactly two bitmaps. */
u8 bitmap1_name[16];
u64 bitmap1_start;
u64 bitmap1_size;
/*u64 bitmap1_flags;*/
u8 bitmap2_name[16];
u64 bitmap2_start;
u64 bitmap2_size;
/*u64 bitmap2_flags;*/
};
struct vmdb {
struct vmdb { /* VMDB: The database header */
u16 ver_major;
u16 ver_minor;
u32 vblk_size;
......@@ -135,22 +146,75 @@ struct vmdb {
u32 last_vblk_seq;
};
struct vblk {
struct vblk_comp { /* VBLK Component */
u8 state[16];
u64 parent_id;
u8 type;
u8 children;
u16 chunksize;
};
struct vblk_dgrp { /* VBLK Disk Group */
u8 disk_id[64];
};
struct vblk_disk { /* VBLK Disk */
u8 disk_id[GUID_SIZE];
u8 alt_name[128];
};
struct vblk_part { /* VBLK Partition */
u64 start;
u64 size; /* start, size and vol_off in sectors */
u64 volume_offset;
u64 parent_id;
u64 disk_id;
u8 partnum;
};
struct vblk_volu { /* VBLK Volume */
u8 volume_type[16];
u8 volume_state[16];
u8 guid[16];
u8 drive_hint[4];
u64 size;
u8 partition_type;
};
struct vblk_head { /* VBLK standard header */
u32 group;
u16 rec;
u16 nrec;
};
struct vblk { /* Generalised VBLK */
u8 name[64];
u8 vblk_type;
u64 obj_id;
u64 disk_id;
u64 start_sector;
u64 num_sectors;
u32 sequence;
u8 flags;
u8 type;
union {
struct vblk_comp comp;
struct vblk_dgrp dgrp;
struct vblk_disk disk;
struct vblk_part part;
struct vblk_volu volu;
} vblk;
struct list_head list;
};
struct ldm_part {
struct list_head part_list;
unsigned long start;
unsigned long size;
struct ldmdb { /* Cache of the database */
struct privhead ph;
struct tocblock toc;
struct vmdb vm;
struct list_head v_dgrp;
struct list_head v_disk;
struct list_head v_volu;
struct list_head v_comp;
struct list_head v_part;
};
int ldm_partition(struct parsed_partitions *state, struct block_device *bdev);
int ldm_partition (struct parsed_partitions *state, struct block_device *bdev);
#endif /* _FS_PT_LDM_H_ */
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