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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/partitions/ldm.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'fs/partitions/ldm.c')
-rw-r--r--fs/partitions/ldm.c1483
1 files changed, 1483 insertions, 0 deletions
diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c
new file mode 100644
index 00000000000..7ab1c11dca4
--- /dev/null
+++ b/fs/partitions/ldm.c
@@ -0,0 +1,1483 @@
+/**
+ * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
+ *
+ * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>
+ * Copyright (c) 2001-2004 Anton Altaparmakov
+ * 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.
+ *
+ * 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 "ldm.h"
+#include "check.h"
+#include "msdos.h"
+
+typedef enum {
+ FALSE = 0,
+ TRUE = 1
+} BOOL;
+
+/**
+ * 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, __FUNCTION__, f, ##a)
+#endif
+
+#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);
+}
+
+
+/**
+ * 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 */
+ 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;
+}
+
+/**
+ * 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)
+{
+ BUG_ON (!data || !ph);
+
+ if (MAGIC_PRIVHEAD != BE64 (data)) {
+ ldm_error ("Cannot find PRIVHEAD structure. LDM database is"
+ " corrupt. Aborting.");
+ return FALSE;
+ }
+
+ 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;
+ }
+
+ 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 != 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 = 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;
+ }
+ 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 != BE32 (data)) {
+ ldm_crit ("Cannot find the VMDB, database may be corrupt.");
+ return FALSE;
+ }
+
+ 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;
+ }
+
+ 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;
+}
+
+/**
+ * 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
+ * @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: TRUE Success
+ * FALSE Error
+ */
+static BOOL ldm_validate_privheads (struct block_device *bdev,
+ 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 (!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;
+ }
+
+ /* 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;
+}
+
+/**
+ * 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
+ *
+ * Find and compare the four tables of contents of the LDM Database stored on
+ * @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 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;
+ 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;
+ }
+
+ 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 */
+ }
+
+ /* 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;
+ }
+
+ 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;
+}
+
+/**
+ * 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
+ *
+ * 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 block_device *bdev, unsigned long base,
+ struct ldmdb *ldb)
+{
+ 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;
+ }
+
+ 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 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
+ * @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).
+ *
+ * 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: TRUE @bdev is a dynamic disk
+ * FALSE @bdev is not a dynamic disk, or an error occurred
+ */
+static BOOL ldm_validate_partition_table (struct block_device *bdev)
+{
+ Sector sect;
+ u8 *data;
+ struct partition *p;
+ int i;
+ BOOL result = FALSE;
+
+ BUG_ON (!bdev);
+
+ data = read_dev_sector (bdev, 0, &sect);
+ if (!data) {
+ ldm_crit ("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) == WIN2K_DYNAMIC_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;
+ }
+
+ 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++;
+ }
+
+ 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;
+ if ((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 != 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 != 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 != 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;
+ }
+ 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
+ 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_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;
+}
+
+/**
+ * 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);
+
+ 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;
+ }
+
+ 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;
+}
+
+/**
+ * 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
+ * @bdev: Device holding the LDM Database
+ * @base: Offset, into @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 block_device *bdev, 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 (!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;
+
+ 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;
+ }
+
+ 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;
+ }
+
+ 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_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
+ * @pp: List of the partitions parsed so far
+ * @bdev: 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, @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. */
+ 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 (ldb);
+ return result;
+}
+