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-rw-r--r--fs/partitions/ldm.c1570
1 files changed, 0 insertions, 1570 deletions
diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c
deleted file mode 100644
index bd8ae788f68..00000000000
--- a/fs/partitions/ldm.c
+++ /dev/null
@@ -1,1570 +0,0 @@
-/**
- * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
- *
- * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
- * Copyright (c) 2001-2007 Anton Altaparmakov
- * Copyright (C) 2001,2002 Jakob Kemi <jakob.kemi@telia.com>
- *
- * Documentation is available at http://www.linux-ntfs.org/doku.php?id=downloads
- *
- * 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.
- *
- * 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 <linux/pagemap.h>
-#include <linux/stringify.h>
-#include <linux/kernel.h>
-#include "ldm.h"
-#include "check.h"
-#include "msdos.h"
-
-/**
- * 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.
- */
-#ifndef CONFIG_LDM_DEBUG
-#define ldm_debug(...) do {} while (0)
-#else
-#define ldm_debug(f, a...) _ldm_printk (KERN_DEBUG, __func__, f, ##a)
-#endif
-
-#define ldm_crit(f, a...) _ldm_printk (KERN_CRIT, __func__, f, ##a)
-#define ldm_error(f, a...) _ldm_printk (KERN_ERR, __func__, f, ##a)
-#define ldm_info(f, a...) _ldm_printk (KERN_INFO, __func__, f, ##a)
-
-static __printf(3, 4)
-void _ldm_printk(const char *level, const char *function, const char *fmt, ...)
-{
- struct va_format vaf;
- va_list args;
-
- va_start (args, fmt);
-
- vaf.fmt = fmt;
- vaf.va = &args;
-
- printk("%s%s(): %pV\n", level, function, &vaf);
-
- va_end(args);
-}
-
-/**
- * ldm_parse_hexbyte - Convert a ASCII hex number to a byte
- * @src: Pointer to at least 2 characters to convert.
- *
- * Convert a two character ASCII hex string to a number.
- *
- * Return: 0-255 Success, the byte was parsed correctly
- * -1 Error, an invalid character was supplied
- */
-static int ldm_parse_hexbyte (const u8 *src)
-{
- unsigned int x; /* For correct wrapping */
- int h;
-
- /* high part */
- x = h = hex_to_bin(src[0]);
- if (h < 0)
- return -1;
-
- /* low part */
- h = hex_to_bin(src[1]);
- if (h < 0)
- return -1;
-
- return (x << 4) + h;
-}
-
-/**
- * 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)
- *
- * N.B. The GUID need not be NULL terminated.
- *
- * 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
- *
- * 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 bool ldm_parse_privhead(const u8 *data, struct privhead *ph)
-{
- bool is_vista = false;
-
- BUG_ON(!data || !ph);
- if (MAGIC_PRIVHEAD != get_unaligned_be64(data)) {
- ldm_error("Cannot find PRIVHEAD structure. LDM database is"
- " corrupt. Aborting.");
- return false;
- }
- ph->ver_major = get_unaligned_be16(data + 0x000C);
- ph->ver_minor = get_unaligned_be16(data + 0x000E);
- ph->logical_disk_start = get_unaligned_be64(data + 0x011B);
- ph->logical_disk_size = get_unaligned_be64(data + 0x0123);
- ph->config_start = get_unaligned_be64(data + 0x012B);
- ph->config_size = get_unaligned_be64(data + 0x0133);
- /* Version 2.11 is Win2k/XP and version 2.12 is Vista. */
- if (ph->ver_major == 2 && ph->ver_minor == 12)
- is_vista = true;
- if (!is_vista && (ph->ver_major != 2 || ph->ver_minor != 11)) {
- ldm_error("Expected PRIVHEAD version 2.11 or 2.12, got %d.%d."
- " Aborting.", ph->ver_major, ph->ver_minor);
- return false;
- }
- ldm_debug("PRIVHEAD version %d.%d (Windows %s).", ph->ver_major,
- ph->ver_minor, is_vista ? "Vista" : "2000/XP");
- 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;
- }
- ldm_debug("Parsed PRIVHEAD successfully.");
- return true;
-}
-
-/**
- * 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 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.
- *
- * N.B. The *_start and *_size values returned in @toc are not range-checked.
- *
- * Return: 'true' @toc contains the TOCBLOCK data
- * 'false' @toc contents are undefined
- */
-static bool ldm_parse_tocblock (const u8 *data, struct tocblock *toc)
-{
- BUG_ON (!data || !toc);
-
- if (MAGIC_TOCBLOCK != get_unaligned_be64(data)) {
- ldm_crit ("Cannot find TOCBLOCK, database may be corrupt.");
- return false;
- }
- strncpy (toc->bitmap1_name, data + 0x24, sizeof (toc->bitmap1_name));
- toc->bitmap1_name[sizeof (toc->bitmap1_name) - 1] = 0;
- toc->bitmap1_start = get_unaligned_be64(data + 0x2E);
- toc->bitmap1_size = get_unaligned_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 = get_unaligned_be64(data + 0x50);
- toc->bitmap2_size = get_unaligned_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;
- }
- ldm_debug ("Parsed TOCBLOCK successfully.");
- return true;
-}
-
-/**
- * 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
- *
- * This parses the LDM Database VMDB structure supplied in @data and sets up
- * the in-memory vmdb structure @vm with the obtained information.
- *
- * N.B. The *_start, *_size and *_seq values will be range-checked later.
- *
- * Return: 'true' @vm contains VMDB info
- * 'false' @vm contents are undefined
- */
-static bool ldm_parse_vmdb (const u8 *data, struct vmdb *vm)
-{
- BUG_ON (!data || !vm);
-
- if (MAGIC_VMDB != get_unaligned_be32(data)) {
- ldm_crit ("Cannot find the VMDB, database may be corrupt.");
- return false;
- }
-
- vm->ver_major = get_unaligned_be16(data + 0x12);
- vm->ver_minor = get_unaligned_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;
- }
-
- vm->vblk_size = get_unaligned_be32(data + 0x08);
- if (vm->vblk_size == 0) {
- ldm_error ("Illegal VBLK size");
- return false;
- }
-
- vm->vblk_offset = get_unaligned_be32(data + 0x0C);
- vm->last_vblk_seq = get_unaligned_be32(data + 0x04);
-
- ldm_debug ("Parsed VMDB successfully.");
- return true;
-}
-
-/**
- * ldm_compare_privheads - Compare two privhead objects
- * @ph1: First privhead
- * @ph2: Second privhead
- *
- * This compares the two privhead structures @ph1 and @ph2.
- *
- * Return: 'true' Identical
- * 'false' Different
- */
-static bool ldm_compare_privheads (const struct privhead *ph1,
- const struct privhead *ph2)
-{
- BUG_ON (!ph1 || !ph2);
-
- 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));
-}
-
-/**
- * ldm_compare_tocblocks - Compare two tocblock objects
- * @toc1: First toc
- * @toc2: Second toc
- *
- * This compares the two tocblock structures @toc1 and @toc2.
- *
- * 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
- * @state: Partition check state including 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: 'true' Success
- * 'false' Error
- */
-static bool ldm_validate_privheads(struct parsed_partitions *state,
- struct privhead *ph1)
-{
- 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;
-
- BUG_ON (!state || !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;
- }
-
- /* 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_part_sector(state, 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 = state->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;
-}
-
-/**
- * ldm_validate_tocblocks - Validate the table of contents and its backups
- * @state: Partition check state including device holding the LDM Database
- * @base: Offset, into @state->bdev, of the database
- * @ldb: Cache of the database structures
- *
- * Find and compare the four tables of contents of the LDM Database stored on
- * @state->bdev and return the parsed information into @toc1.
- *
- * The offsets and sizes of the configs are range-checked against a privhead.
- *
- * Return: 'true' @toc1 contains validated TOCBLOCK info
- * 'false' @toc1 contents are undefined
- */
-static bool ldm_validate_tocblocks(struct parsed_partitions *state,
- 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;
- u8 *data;
- int i, nr_tbs;
- bool result = false;
-
- BUG_ON(!state || !ldb);
- ph = &ldb->ph;
- tb[0] = &ldb->toc;
- tb[1] = kmalloc(sizeof(*tb[1]) * 3, GFP_KERNEL);
- if (!tb[1]) {
- ldm_crit("Out of memory.");
- goto err;
- }
- tb[2] = (struct tocblock*)((u8*)tb[1] + sizeof(*tb[1]));
- tb[3] = (struct tocblock*)((u8*)tb[2] + sizeof(*tb[2]));
- /*
- * Try to read and parse all four TOCBLOCKs.
- *
- * Windows Vista LDM v2.12 does not always have all four TOCBLOCKs so
- * skip any that fail as long as we get at least one valid TOCBLOCK.
- */
- for (nr_tbs = i = 0; i < 4; i++) {
- data = read_part_sector(state, base + off[i], &sect);
- if (!data) {
- ldm_error("Disk read failed for TOCBLOCK %d.", i);
- continue;
- }
- if (ldm_parse_tocblock(data, tb[nr_tbs]))
- nr_tbs++;
- put_dev_sector(sect);
- }
- if (!nr_tbs) {
- ldm_crit("Failed to find a valid TOCBLOCK.");
- goto err;
- }
- /* Range check the TOCBLOCK 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 err;
- }
- /* Compare all loaded TOCBLOCKs. */
- for (i = 1; i < nr_tbs; i++) {
- if (!ldm_compare_tocblocks(tb[0], tb[i])) {
- ldm_crit("TOCBLOCKs 0 and %d do not match.", i);
- goto err;
- }
- }
- ldm_debug("Validated %d TOCBLOCKs successfully.", nr_tbs);
- result = true;
-err:
- kfree(tb[1]);
- return result;
-}
-
-/**
- * ldm_validate_vmdb - Read the VMDB and validate it
- * @state: Partition check state including device holding the LDM Database
- * @base: Offset, into @bdev, of the database
- * @ldb: Cache of the database structures
- *
- * Find the vmdb of the LDM Database stored on @bdev and return the parsed
- * information in @ldb.
- *
- * Return: 'true' @ldb contains validated VBDB info
- * 'false' @ldb contents are undefined
- */
-static bool ldm_validate_vmdb(struct parsed_partitions *state,
- unsigned long base, struct ldmdb *ldb)
-{
- Sector sect;
- u8 *data;
- bool result = false;
- struct vmdb *vm;
- struct tocblock *toc;
-
- BUG_ON (!state || !ldb);
-
- vm = &ldb->vm;
- toc = &ldb->toc;
-
- data = read_part_sector(state, base + OFF_VMDB, &sect);
- if (!data) {
- ldm_crit ("Disk read failed.");
- return false;
- }
-
- if (!ldm_parse_vmdb (data, vm))
- goto out; /* Already logged */
-
- /* Are there uncommitted transactions? */
- if (get_unaligned_be16(data + 0x10) != 0x01) {
- ldm_crit ("Database is not in a consistent state. Aborting.");
- goto out;
- }
-
- if (vm->vblk_offset != 512)
- ldm_info ("VBLKs start at offset 0x%04x.", vm->vblk_offset);
-
- /*
- * The last_vblkd_seq can be before the end of the vmdb, just make sure
- * it is not out of bounds.
- */
- if ((vm->vblk_size * vm->last_vblk_seq) > (toc->bitmap1_size << 9)) {
- ldm_crit ("VMDB exceeds allowed size specified by TOCBLOCK. "
- "Database is corrupt. Aborting.");
- goto out;
- }
-
- result = true;
-out:
- put_dev_sector (sect);
- return result;
-}
-
-
-/**
- * ldm_validate_partition_table - Determine whether bdev might be a dynamic disk
- * @state: Partition check state including 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).
- *
- * N.B. The only possible error can come from the read_part_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: 'true' @state->bdev is a dynamic disk
- * 'false' @state->bdev is not a dynamic disk, or an error occurred
- */
-static bool ldm_validate_partition_table(struct parsed_partitions *state)
-{
- Sector sect;
- u8 *data;
- struct partition *p;
- int i;
- bool result = false;
-
- BUG_ON(!state);
-
- data = read_part_sector(state, 0, &sect);
- if (!data) {
- ldm_info ("Disk read failed.");
- return false;
- }
-
- if (*(__le16*) (data + 0x01FE) != cpu_to_le16 (MSDOS_LABEL_MAGIC))
- goto out;
-
- p = (struct partition*)(data + 0x01BE);
- for (i = 0; i < 4; i++, p++)
- if (SYS_IND (p) == LDM_PARTITION) {
- result = true;
- break;
- }
-
- if (result)
- ldm_debug ("Found W2K dynamic disk partition type.");
-
-out:
- put_dev_sector (sect);
- return result;
-}
-
-/**
- * ldm_get_disk_objid - Search a linked list of vblk's for a given Disk Id
- * @ldb: Cache of the database structures
- *
- * 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: Pointer, A matching vblk was found
- * NULL, No match, or an error
- */
-static struct vblk * ldm_get_disk_objid (const struct ldmdb *ldb)
-{
- 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;
-}
-
-/**
- * ldm_create_data_partitions - Create data partitions for this device
- * @pp: List of the partitions parsed so far
- * @ldb: Cache of the database structures
- *
- * 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.
- *
- * N.B. This function creates the partitions in the order it finds partition
- * objects in the linked list.
- *
- * Return: 'true' Partition created
- * 'false' Error, probably a range checking problem
- */
-static bool ldm_create_data_partitions (struct parsed_partitions *pp,
- const struct ldmdb *ldb)
-{
- 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;
- }
-
- strlcat(pp->pp_buf, " [LDM]", PAGE_SIZE);
-
- /* 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++;
- }
-
- strlcat(pp->pp_buf, "\n", PAGE_SIZE);
- 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) {
- if (!buffer)
- ldm_error("!buffer");
- if (offset < 0)
- ldm_error("offset (%d) < 0", offset);
- if (base > buflen)
- ldm_error("base (%d) > buflen (%d)", base, buflen);
- return -1;
- }
- if (base + buffer[base] >= buflen) {
- ldm_error("base (%d) + buffer[base] (%d) >= buflen (%d)", base,
- buffer[base], buflen);
- return -1;
- }
- return buffer[base] + offset + 1;
-}
-
-/**
- * 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
- *
- * N.B. This function DOES NOT perform any range checking, though the most
- * it will read is eight bytes.
- *
- * Return: n A number
- * 0 Zero, or an error occurred
- */
-static u64 ldm_get_vnum (const u8 *block)
-{
- 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;
- }
- 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;
- }
- if (len < 0)
- return false;
-
- len += VBLK_SIZE_CMP3;
- if (len != get_unaligned_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;
- }
- if (len < 0)
- return false;
-
- len += VBLK_SIZE_DGR3;
- if (len != get_unaligned_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;
- }
- if (len < 0)
- return false;
-
- len += VBLK_SIZE_DGR4;
- if (len != get_unaligned_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 != get_unaligned_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 != get_unaligned_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);
- if (r_objid < 0) {
- ldm_error("r_objid %d < 0", r_objid);
- return false;
- }
- r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
- if (r_name < 0) {
- ldm_error("r_name %d < 0", r_name);
- return false;
- }
- r_size = ldm_relative(buffer, buflen, 0x34, r_name);
- if (r_size < 0) {
- ldm_error("r_size %d < 0", r_size);
- return false;
- }
- r_parent = ldm_relative(buffer, buflen, 0x34, r_size);
- if (r_parent < 0) {
- ldm_error("r_parent %d < 0", r_parent);
- return false;
- }
- r_diskid = ldm_relative(buffer, buflen, 0x34, r_parent);
- if (r_diskid < 0) {
- ldm_error("r_diskid %d < 0", r_diskid);
- return false;
- }
- if (buffer[0x12] & VBLK_FLAG_PART_INDEX) {
- r_index = ldm_relative(buffer, buflen, 0x34, r_diskid);
- if (r_index < 0) {
- ldm_error("r_index %d < 0", r_index);
- return false;
- }
- len = r_index;
- } else {
- r_index = 0;
- len = r_diskid;
- }
- if (len < 0) {
- ldm_error("len %d < 0", len);
- return false;
- }
- len += VBLK_SIZE_PRT3;
- if (len > get_unaligned_be32(buffer + 0x14)) {
- ldm_error("len %d > BE32(buffer + 0x14) %d", len,
- get_unaligned_be32(buffer + 0x14));
- return false;
- }
- part = &vb->vblk.part;
- part->start = get_unaligned_be64(buffer + 0x24 + r_name);
- part->volume_offset = get_unaligned_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
- part->partnum = 0;
- return true;
-}
-
-/**
- * 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
- *
- * Read a raw VBLK Volume object (version 5) into a vblk structure.
- *
- * Return: 'true' @vb contains a Volume VBLK
- * 'false' @vb contents are not defined
- */
-static bool ldm_parse_vol5(const u8 *buffer, int buflen, struct vblk *vb)
-{
- int r_objid, r_name, r_vtype, r_disable_drive_letter, r_child, r_size;
- int r_id1, r_id2, r_size2, r_drive, len;
- struct vblk_volu *volu;
-
- BUG_ON(!buffer || !vb);
- r_objid = ldm_relative(buffer, buflen, 0x18, 0);
- if (r_objid < 0) {
- ldm_error("r_objid %d < 0", r_objid);
- return false;
- }
- r_name = ldm_relative(buffer, buflen, 0x18, r_objid);
- if (r_name < 0) {
- ldm_error("r_name %d < 0", r_name);
- return false;
- }
- r_vtype = ldm_relative(buffer, buflen, 0x18, r_name);
- if (r_vtype < 0) {
- ldm_error("r_vtype %d < 0", r_vtype);
- return false;
- }
- r_disable_drive_letter = ldm_relative(buffer, buflen, 0x18, r_vtype);
- if (r_disable_drive_letter < 0) {
- ldm_error("r_disable_drive_letter %d < 0",
- r_disable_drive_letter);
- return false;
- }
- r_child = ldm_relative(buffer, buflen, 0x2D, r_disable_drive_letter);
- if (r_child < 0) {
- ldm_error("r_child %d < 0", r_child);
- return false;
- }
- r_size = ldm_relative(buffer, buflen, 0x3D, r_child);
- if (r_size < 0) {
- ldm_error("r_size %d < 0", r_size);
- return false;
- }
- if (buffer[0x12] & VBLK_FLAG_VOLU_ID1) {
- r_id1 = ldm_relative(buffer, buflen, 0x52, r_size);
- if (r_id1 < 0) {
- ldm_error("r_id1 %d < 0", r_id1);
- return false;
- }
- } else
- r_id1 = r_size;
- if (buffer[0x12] & VBLK_FLAG_VOLU_ID2) {
- r_id2 = ldm_relative(buffer, buflen, 0x52, r_id1);
- if (r_id2 < 0) {
- ldm_error("r_id2 %d < 0", r_id2);
- return false;
- }
- } else
- r_id2 = r_id1;
- if (buffer[0x12] & VBLK_FLAG_VOLU_SIZE) {
- r_size2 = ldm_relative(buffer, buflen, 0x52, r_id2);
- if (r_size2 < 0) {
- ldm_error("r_size2 %d < 0", r_size2);
- return false;
- }
- } else
- r_size2 = r_id2;
- if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
- r_drive = ldm_relative(buffer, buflen, 0x52, r_size2);
- if (r_drive < 0) {
- ldm_error("r_drive %d < 0", r_drive);
- return false;
- }
- } else
- r_drive = r_size2;
- len = r_drive;
- if (len < 0) {
- ldm_error("len %d < 0", len);
- return false;
- }
- len += VBLK_SIZE_VOL5;
- if (len > get_unaligned_be32(buffer + 0x14)) {
- ldm_error("len %d > BE32(buffer + 0x14) %d", len,
- get_unaligned_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 + 0x18 + r_disable_drive_letter,
- sizeof(volu->volume_state));
- volu->size = ldm_get_vnum(buffer + 0x3D + r_child);
- volu->partition_type = buffer[0x41 + r_size];
- memcpy(volu->guid, buffer + 0x42 + r_size, sizeof(volu->guid));
- if (buffer[0x12] & VBLK_FLAG_VOLU_DRIVE) {
- ldm_get_vstr(buffer + 0x52 + r_size, volu->drive_hint,
- sizeof(volu->drive_hint));
- }
- return true;
-}
-
-/**
- * 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
- *
- * 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: 'true' @vb contains a VBLK
- * 'false' @vb contents are not defined
- */
-static bool ldm_parse_vblk (const u8 *buf, int len, struct vblk *vb)
-{
- 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;
- }
-
- 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;
- }
-
- if (result)
- ldm_debug ("Parsed VBLK 0x%llx (type: 0x%02x) ok.",
- (unsigned long long) vb->obj_id, vb->type);
- else
- ldm_error ("Failed to parse VBLK 0x%llx (type: 0x%02x).",
- (unsigned long long) vb->obj_id, vb->type);
-
- return result;
-}
-
-
-/**
- * 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.
- *
- * N.B. This function does not check the validity of the VBLKs.
- *
- * Return: 'true' The VBLK was added
- * 'false' An error occurred
- */
-static bool ldm_ldmdb_add (u8 *data, int len, struct ldmdb *ldb)
-{
- 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;
- }
-
- if (!ldm_parse_vblk (data, len, vb)) {
- kfree(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;
- }
- }
- list_add_tail (&vb->list, &ldb->v_part);
- break;
- }
- return true;
-}
-
-/**
- * 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);
-
- if (size < 2 * VBLK_SIZE_HEAD) {
- ldm_error("Value of size is to small.");
- return false;
- }
-
- group = get_unaligned_be32(data + 0x08);
- rec = get_unaligned_be16(data + 0x0C);
- num = get_unaligned_be16(data + 0x0E);
- if ((num < 1) || (num > 4)) {
- ldm_error ("A VBLK claims to have %d parts.", num);
- return false;
- }
- if (rec >= num) {
- ldm_error("REC value (%d) exceeds NUM value (%d)", rec, 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 (rec >= f->num) {
- ldm_error("REC value (%d) exceeds NUM value (%d)", rec, f->num);
- return false;
- }
-
- if (f->map & (1 << rec)) {
- ldm_error ("Duplicate VBLK, part %d.", rec);
- f->map &= 0x7F; /* Mark the group as broken */
- return false;
- }
-
- f->map |= (1 << rec);
-
- data += VBLK_SIZE_HEAD;
- size -= VBLK_SIZE_HEAD;
-
- memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size);
-
- return true;
-}
-
-/**
- * ldm_frag_free - Free a linked list of VBLK fragments
- * @list: Linked list of fragments
- *
- * Free a linked list of VBLK fragments
- *
- * Return: none
- */
-static void ldm_frag_free (struct list_head *list)
-{
- struct list_head *item, *tmp;
-
- 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;
- }
-
- if (!ldm_ldmdb_add (f->data, f->num*ldb->vm.vblk_size, ldb))
- return false; /* Already logged */
- }
- return true;
-}
-
-/**
- * ldm_get_vblks - Read the on-disk database of VBLKs into memory
- * @state: Partition check state including device holding the LDM Database
- * @base: Offset, into @state->bdev, of the database
- * @ldb: Cache of the database structures
- *
- * 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: 'true' All the VBLKs were read successfully
- * 'false' An error occurred
- */
-static bool ldm_get_vblks(struct parsed_partitions *state, unsigned long base,
- struct ldmdb *ldb)
-{
- int size, perbuf, skip, finish, s, v, recs;
- u8 *data = NULL;
- Sector sect;
- bool result = false;
- LIST_HEAD (frags);
-
- BUG_ON(!state || !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;
-
- for (s = skip; s < finish; s++) { /* For each sector */
- data = read_part_sector(state, base + OFF_VMDB + s, &sect);
- if (!data) {
- ldm_crit ("Disk read failed.");
- goto out;
- }
-
- for (v = 0; v < perbuf; v++, data+=size) { /* For each vblk */
- if (MAGIC_VBLK != get_unaligned_be32(data)) {
- ldm_error ("Expected to find a VBLK.");
- goto out;
- }
-
- recs = get_unaligned_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_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.
- *
- * 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
- * @state: Partition check state including device holding the LDM Database
- *
- * 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, 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, @state->bdev is a dynamic disk and we handled it
- * 0 Success, @state->bdev is not a dynamic disk
- * -1 An error occurred before enough information had been read
- * Or @state->bdev is a dynamic disk, but it may be corrupted
- */
-int ldm_partition(struct parsed_partitions *state)
-{
- struct ldmdb *ldb;
- unsigned long base;
- int result = -1;
-
- BUG_ON(!state);
-
- /* Look for signs of a Dynamic Disk */
- if (!ldm_validate_partition_table(state))
- 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(state, &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(state, base, ldb) ||
- !ldm_validate_vmdb(state, 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(state, base, ldb)) {
- ldm_crit ("Failed to read the VBLKs from the database.");
- goto cleanup;
- }
-
- /* Finally, create the data partition devices. */
- if (ldm_create_data_partitions(state, 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 (ldb);
- return result;
-}