super.c 51 KB
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/*
 * super.c
 *
 * PURPOSE
 *  Super block routines for the OSTA-UDF(tm) filesystem.
 *
 * DESCRIPTION
 *  OSTA-UDF(tm) = Optical Storage Technology Association
 *  Universal Disk Format.
 *
 *  This code is based on version 2.00 of the UDF specification,
 *  and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
 *    http://www.osta.org/
 *    http://www.ecma.ch/
 *    http://www.iso.org/
 *
 * COPYRIGHT
 *  This file is distributed under the terms of the GNU General Public
 *  License (GPL). Copies of the GPL can be obtained from:
 *    ftp://prep.ai.mit.edu/pub/gnu/GPL
 *  Each contributing author retains all rights to their own work.
 *
 *  (C) 1998 Dave Boynton
 *  (C) 1998-2004 Ben Fennema
 *  (C) 2000 Stelias Computing Inc
 *
 * HISTORY
 *
 *  09/24/98 dgb  changed to allow compiling outside of kernel, and
 *                added some debugging.
 *  10/01/98 dgb  updated to allow (some) possibility of compiling w/2.0.34
 *  10/16/98      attempting some multi-session support
 *  10/17/98      added freespace count for "df"
 *  11/11/98 gr   added novrs option
 *  11/26/98 dgb  added fileset,anchor mount options
 *  12/06/98 blf  really hosed things royally. vat/sparing support. sequenced vol descs
 *                rewrote option handling based on isofs
 *  12/20/98      find the free space bitmap (if it exists)
 */

#include "udfdecl.h"    

#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/parser.h>
#include <linux/stat.h>
#include <linux/cdrom.h>
#include <linux/nls.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/vmalloc.h>
#include <asm/byteorder.h>

#include <linux/udf_fs.h>
#include "udf_sb.h"
#include "udf_i.h"

#include <linux/init.h>
#include <asm/uaccess.h>

#define VDS_POS_PRIMARY_VOL_DESC	0
#define VDS_POS_UNALLOC_SPACE_DESC	1
#define VDS_POS_LOGICAL_VOL_DESC	2
#define VDS_POS_PARTITION_DESC		3
#define VDS_POS_IMP_USE_VOL_DESC	4
#define VDS_POS_VOL_DESC_PTR		5
#define VDS_POS_TERMINATING_DESC	6
#define VDS_POS_LENGTH			7

static char error_buf[1024];

/* These are the "meat" - everything else is stuffing */
static int udf_fill_super(struct super_block *, void *, int);
static void udf_put_super(struct super_block *);
static void udf_write_super(struct super_block *);
static int udf_remount_fs(struct super_block *, int *, char *);
static int udf_check_valid(struct super_block *, int, int);
static int udf_vrs(struct super_block *sb, int silent);
static int udf_load_partition(struct super_block *, kernel_lb_addr *);
static int udf_load_logicalvol(struct super_block *, struct buffer_head *, kernel_lb_addr *);
static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
static void udf_find_anchor(struct super_block *);
static int udf_find_fileset(struct super_block *, kernel_lb_addr *, kernel_lb_addr *);
static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
static void udf_load_fileset(struct super_block *, struct buffer_head *, kernel_lb_addr *);
static void udf_load_partdesc(struct super_block *, struct buffer_head *);
static void udf_open_lvid(struct super_block *);
static void udf_close_lvid(struct super_block *);
static unsigned int udf_count_free(struct super_block *);
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static int udf_statfs(struct dentry *, struct kstatfs *);
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/* UDF filesystem type */
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static int udf_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
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{
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	return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
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}

static struct file_system_type udf_fstype = {
	.owner		= THIS_MODULE,
	.name		= "udf",
	.get_sb		= udf_get_sb,
	.kill_sb	= kill_block_super,
	.fs_flags	= FS_REQUIRES_DEV,
};

static kmem_cache_t * udf_inode_cachep;

static struct inode *udf_alloc_inode(struct super_block *sb)
{
	struct udf_inode_info *ei;
	ei = (struct udf_inode_info *)kmem_cache_alloc(udf_inode_cachep, SLAB_KERNEL);
	if (!ei)
		return NULL;
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	ei->i_unique = 0;
	ei->i_lenExtents = 0;
	ei->i_next_alloc_block = 0;
	ei->i_next_alloc_goal = 0;
	ei->i_strat4096 = 0;

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	return &ei->vfs_inode;
}

static void udf_destroy_inode(struct inode *inode)
{
	kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}

static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct udf_inode_info *ei = (struct udf_inode_info *) foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR)
	{
		ei->i_ext.i_data = NULL;
		inode_init_once(&ei->vfs_inode);
	}
}

static int init_inodecache(void)
{
	udf_inode_cachep = kmem_cache_create("udf_inode_cache",
					     sizeof(struct udf_inode_info),
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					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
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					     init_once, NULL);
	if (udf_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

static void destroy_inodecache(void)
{
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	kmem_cache_destroy(udf_inode_cachep);
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}

/* Superblock operations */
static struct super_operations udf_sb_ops = {
	.alloc_inode		= udf_alloc_inode,
	.destroy_inode		= udf_destroy_inode,
	.write_inode		= udf_write_inode,
	.delete_inode		= udf_delete_inode,
	.clear_inode		= udf_clear_inode,
	.put_super		= udf_put_super,
	.write_super		= udf_write_super,
	.statfs			= udf_statfs,
	.remount_fs		= udf_remount_fs,
};

struct udf_options
{
	unsigned char novrs;
	unsigned int blocksize;
	unsigned int session;
	unsigned int lastblock;
	unsigned int anchor;
	unsigned int volume;
	unsigned short partition;
	unsigned int fileset;
	unsigned int rootdir;
	unsigned int flags;
	mode_t umask;
	gid_t gid;
	uid_t uid;
	struct nls_table *nls_map;
};

static int __init init_udf_fs(void)
{
	int err;
	err = init_inodecache();
	if (err)
		goto out1;
	err = register_filesystem(&udf_fstype);
	if (err)
		goto out;
	return 0;
out:
	destroy_inodecache();
out1:
	return err;
}

static void __exit exit_udf_fs(void)
{
	unregister_filesystem(&udf_fstype);
	destroy_inodecache();
}

module_init(init_udf_fs)
module_exit(exit_udf_fs)

/*
 * udf_parse_options
 *
 * PURPOSE
 *	Parse mount options.
 *
 * DESCRIPTION
 *	The following mount options are supported:
 *
 *	gid=		Set the default group.
 *	umask=		Set the default umask.
 *	uid=		Set the default user.
 *	bs=		Set the block size.
 *	unhide		Show otherwise hidden files.
 *	undelete	Show deleted files in lists.
 *	adinicb		Embed data in the inode (default)
 *	noadinicb	Don't embed data in the inode
 *	shortad		Use short ad's
 *	longad		Use long ad's (default)
 *	nostrict	Unset strict conformance
 *	iocharset=	Set the NLS character set
 *
 *	The remaining are for debugging and disaster recovery:
 *
 *	novrs		Skip volume sequence recognition 
 *
 *	The following expect a offset from 0.
 *
 *	session=	Set the CDROM session (default= last session)
 *	anchor=		Override standard anchor location. (default= 256)
 *	volume=		Override the VolumeDesc location. (unused)
 *	partition=	Override the PartitionDesc location. (unused)
 *	lastblock=	Set the last block of the filesystem/
 *
 *	The following expect a offset from the partition root.
 *
 *	fileset=	Override the fileset block location. (unused)
 *	rootdir=	Override the root directory location. (unused)
 *		WARNING: overriding the rootdir to a non-directory may
 *		yield highly unpredictable results.
 *
 * PRE-CONDITIONS
 *	options		Pointer to mount options string.
 *	uopts		Pointer to mount options variable.
 *
 * POST-CONDITIONS
 *	<return>	1	Mount options parsed okay.
 *	<return>	0	Error parsing mount options.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */

enum {
	Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
	Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
	Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
	Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
	Opt_rootdir, Opt_utf8, Opt_iocharset,
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	Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore
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};

static match_table_t tokens = {
	{Opt_novrs, "novrs"},
	{Opt_nostrict, "nostrict"},
	{Opt_bs, "bs=%u"},
	{Opt_unhide, "unhide"},
	{Opt_undelete, "undelete"},
	{Opt_noadinicb, "noadinicb"},
	{Opt_adinicb, "adinicb"},
	{Opt_shortad, "shortad"},
	{Opt_longad, "longad"},
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	{Opt_uforget, "uid=forget"},
	{Opt_uignore, "uid=ignore"},
	{Opt_gforget, "gid=forget"},
	{Opt_gignore, "gid=ignore"},
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	{Opt_gid, "gid=%u"},
	{Opt_uid, "uid=%u"},
	{Opt_umask, "umask=%o"},
	{Opt_session, "session=%u"},
	{Opt_lastblock, "lastblock=%u"},
	{Opt_anchor, "anchor=%u"},
	{Opt_volume, "volume=%u"},
	{Opt_partition, "partition=%u"},
	{Opt_fileset, "fileset=%u"},
	{Opt_rootdir, "rootdir=%u"},
	{Opt_utf8, "utf8"},
	{Opt_iocharset, "iocharset=%s"},
	{Opt_err, NULL}
};

static int
udf_parse_options(char *options, struct udf_options *uopt)
{
	char *p;
	int option;

	uopt->novrs = 0;
	uopt->blocksize = 2048;
	uopt->partition = 0xFFFF;
	uopt->session = 0xFFFFFFFF;
	uopt->lastblock = 0;
	uopt->anchor = 0;
	uopt->volume = 0xFFFFFFFF;
	uopt->rootdir = 0xFFFFFFFF;
	uopt->fileset = 0xFFFFFFFF;
	uopt->nls_map = NULL;

	if (!options)
		return 1;

	while ((p = strsep(&options, ",")) != NULL)
	{
		substring_t args[MAX_OPT_ARGS];
		int token;
		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token)
		{
			case Opt_novrs:
				uopt->novrs = 1;
			case Opt_bs:
				if (match_int(&args[0], &option))
					return 0;
				uopt->blocksize = option;
				break;
			case Opt_unhide:
				uopt->flags |= (1 << UDF_FLAG_UNHIDE);
				break;
			case Opt_undelete:
				uopt->flags |= (1 << UDF_FLAG_UNDELETE);
				break;
			case Opt_noadinicb:
				uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
				break;
			case Opt_adinicb:
				uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
				break;
			case Opt_shortad:
				uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
				break;
			case Opt_longad:
				uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
				break;
			case Opt_gid:
				if (match_int(args, &option))
					return 0;
				uopt->gid = option;
				break;
			case Opt_uid:
				if (match_int(args, &option))
					return 0;
				uopt->uid = option;
				break;
			case Opt_umask:
				if (match_octal(args, &option))
					return 0;
				uopt->umask = option;
				break;
			case Opt_nostrict:
				uopt->flags &= ~(1 << UDF_FLAG_STRICT);
				break;
			case Opt_session:
				if (match_int(args, &option))
					return 0;
				uopt->session = option;
				break;
			case Opt_lastblock:
				if (match_int(args, &option))
					return 0;
				uopt->lastblock = option;
				break;
			case Opt_anchor:
				if (match_int(args, &option))
					return 0;
				uopt->anchor = option;
				break;
			case Opt_volume:
				if (match_int(args, &option))
					return 0;
				uopt->volume = option;
				break;
			case Opt_partition:
				if (match_int(args, &option))
					return 0;
				uopt->partition = option;
				break;
			case Opt_fileset:
				if (match_int(args, &option))
					return 0;
				uopt->fileset = option;
				break;
			case Opt_rootdir:
				if (match_int(args, &option))
					return 0;
				uopt->rootdir = option;
				break;
			case Opt_utf8:
				uopt->flags |= (1 << UDF_FLAG_UTF8);
				break;
#ifdef CONFIG_UDF_NLS
			case Opt_iocharset:
				uopt->nls_map = load_nls(args[0].from);
				uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
				break;
#endif
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			case Opt_uignore:
				uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
				break;
			case Opt_uforget:
				uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
				break;
			case Opt_gignore:
			    uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
				break;
			case Opt_gforget:
			    uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
				break;
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			default:
				printk(KERN_ERR "udf: bad mount option \"%s\" "
						"or missing value\n", p);
			return 0;
		}
	}
	return 1;
}

void
udf_write_super(struct super_block *sb)
{
	lock_kernel();
	if (!(sb->s_flags & MS_RDONLY))
		udf_open_lvid(sb);
	sb->s_dirt = 0;
	unlock_kernel();
}

static int
udf_remount_fs(struct super_block *sb, int *flags, char *options)
{
	struct udf_options uopt;

	uopt.flags = UDF_SB(sb)->s_flags ;
	uopt.uid   = UDF_SB(sb)->s_uid ;
	uopt.gid   = UDF_SB(sb)->s_gid ;
	uopt.umask = UDF_SB(sb)->s_umask ;

	if ( !udf_parse_options(options, &uopt) )
		return -EINVAL;

	UDF_SB(sb)->s_flags = uopt.flags;
	UDF_SB(sb)->s_uid   = uopt.uid;
	UDF_SB(sb)->s_gid   = uopt.gid;
	UDF_SB(sb)->s_umask = uopt.umask;

	if (UDF_SB_LVIDBH(sb)) {
		int write_rev = le16_to_cpu(UDF_SB_LVIDIU(sb)->minUDFWriteRev);
		if (write_rev > UDF_MAX_WRITE_VERSION)
			*flags |= MS_RDONLY;
	}

	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
		return 0;
	if (*flags & MS_RDONLY)
		udf_close_lvid(sb);
	else
		udf_open_lvid(sb);

	return 0;
}

/*
 * udf_set_blocksize
 *
 * PURPOSE
 *	Set the block size to be used in all transfers.
 *
 * DESCRIPTION
 *	To allow room for a DMA transfer, it is best to guess big when unsure.
 *	This routine picks 2048 bytes as the blocksize when guessing. This
 *	should be adequate until devices with larger block sizes become common.
 *
 *	Note that the Linux kernel can currently only deal with blocksizes of
 *	512, 1024, 2048, 4096, and 8192 bytes.
 *
 * PRE-CONDITIONS
 *	sb			Pointer to _locked_ superblock.
 *
 * POST-CONDITIONS
 *	sb->s_blocksize		Blocksize.
 *	sb->s_blocksize_bits	log2 of blocksize.
 *	<return>	0	Blocksize is valid.
 *	<return>	1	Blocksize is invalid.
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */
static  int
udf_set_blocksize(struct super_block *sb, int bsize)
{
	if (!sb_min_blocksize(sb, bsize)) {
		udf_debug("Bad block size (%d)\n", bsize);
		printk(KERN_ERR "udf: bad block size (%d)\n", bsize);
		return 0;
	}
	return sb->s_blocksize;
}

static int
udf_vrs(struct super_block *sb, int silent)
{
	struct volStructDesc *vsd = NULL;
	int sector = 32768;
	int sectorsize;
	struct buffer_head *bh = NULL;
	int iso9660=0;
	int nsr02=0;
	int nsr03=0;

	/* Block size must be a multiple of 512 */
	if (sb->s_blocksize & 511)
		return 0;

	if (sb->s_blocksize < sizeof(struct volStructDesc))
		sectorsize = sizeof(struct volStructDesc);
	else
		sectorsize = sb->s_blocksize;

	sector += (UDF_SB_SESSION(sb) << sb->s_blocksize_bits);

	udf_debug("Starting at sector %u (%ld byte sectors)\n",
		(sector >> sb->s_blocksize_bits), sb->s_blocksize);
	/* Process the sequence (if applicable) */
	for (;!nsr02 && !nsr03; sector += sectorsize)
	{
		/* Read a block */
		bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
		if (!bh)
			break;

		/* Look for ISO  descriptors */
		vsd = (struct volStructDesc *)(bh->b_data +
			(sector & (sb->s_blocksize - 1)));

		if (vsd->stdIdent[0] == 0)
		{
			udf_release_data(bh);
			break;
		}
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN))
		{
			iso9660 = sector;
			switch (vsd->structType)
			{
				case 0: 
					udf_debug("ISO9660 Boot Record found\n");
					break;
				case 1: 
					udf_debug("ISO9660 Primary Volume Descriptor found\n");
					break;
				case 2: 
					udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
					break;
				case 3: 
					udf_debug("ISO9660 Volume Partition Descriptor found\n");
					break;
				case 255: 
					udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
					break;
				default: 
					udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
					break;
			}
		}
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
		{
		}
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, VSD_STD_ID_LEN))
		{
			udf_release_data(bh);
			break;
		}
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
		{
			nsr02 = sector;
		}
		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
		{
			nsr03 = sector;
		}
		udf_release_data(bh);
	}

	if (nsr03)
		return nsr03;
	else if (nsr02)
		return nsr02;
	else if (sector - (UDF_SB_SESSION(sb) << sb->s_blocksize_bits) == 32768)
		return -1;
	else
		return 0;
}

/*
 * udf_find_anchor
 *
 * PURPOSE
 *	Find an anchor volume descriptor.
 *
 * PRE-CONDITIONS
 *	sb			Pointer to _locked_ superblock.
 *	lastblock		Last block on media.
 *
 * POST-CONDITIONS
 *	<return>		1 if not found, 0 if ok
 *
 * HISTORY
 *	July 1, 1997 - Andrew E. Mileski
 *	Written, tested, and released.
 */
static void
udf_find_anchor(struct super_block *sb)
{
	int lastblock = UDF_SB_LASTBLOCK(sb);
	struct buffer_head *bh = NULL;
	uint16_t ident;
	uint32_t location;
	int i;

	if (lastblock)
	{
		int varlastblock = udf_variable_to_fixed(lastblock);
		int last[] =  { lastblock, lastblock - 2,
				lastblock - 150, lastblock - 152,
				varlastblock, varlastblock - 2,
				varlastblock - 150, varlastblock - 152 };

		lastblock = 0;

		/* Search for an anchor volume descriptor pointer */

		/*  according to spec, anchor is in either:
		 *     block 256
		 *     lastblock-256
		 *     lastblock
		 *  however, if the disc isn't closed, it could be 512 */

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		for (i = 0; !lastblock && i < ARRAY_SIZE(last); i++) {
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			if (last[i] < 0 || !(bh = sb_bread(sb, last[i])))
			{
				ident = location = 0;
			}
			else
			{
				ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
				location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
				udf_release_data(bh);
			}
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			if (ident == TAG_IDENT_AVDP)
			{
				if (location == last[i] - UDF_SB_SESSION(sb))
				{
					lastblock = UDF_SB_ANCHOR(sb)[0] = last[i] - UDF_SB_SESSION(sb);
					UDF_SB_ANCHOR(sb)[1] = last[i] - 256 - UDF_SB_SESSION(sb);
				}
				else if (location == udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb))
				{
					UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
					lastblock = UDF_SB_ANCHOR(sb)[0] = udf_variable_to_fixed(last[i]) - UDF_SB_SESSION(sb);
					UDF_SB_ANCHOR(sb)[1] = lastblock - 256 - UDF_SB_SESSION(sb);
				}
				else
					udf_debug("Anchor found at block %d, location mismatch %d.\n",
						last[i], location);
			}
			else if (ident == TAG_IDENT_FE || ident == TAG_IDENT_EFE)
			{
				lastblock = last[i];
				UDF_SB_ANCHOR(sb)[3] = 512;
			}
			else
			{
				if (last[i] < 256 || !(bh = sb_bread(sb, last[i] - 256)))
				{
					ident = location = 0;
				}
				else
				{
					ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
					location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
					udf_release_data(bh);
				}
	
				if (ident == TAG_IDENT_AVDP &&
					location == last[i] - 256 - UDF_SB_SESSION(sb))
				{
					lastblock = last[i];
					UDF_SB_ANCHOR(sb)[1] = last[i] - 256;
				}
				else
				{
					if (last[i] < 312 + UDF_SB_SESSION(sb) || !(bh = sb_bread(sb, last[i] - 312 - UDF_SB_SESSION(sb))))
					{
						ident = location = 0;
					}
					else
					{
						ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
						location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
						udf_release_data(bh);
					}
	
					if (ident == TAG_IDENT_AVDP &&
						location == udf_variable_to_fixed(last[i]) - 256)
					{
						UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
						lastblock = udf_variable_to_fixed(last[i]);
						UDF_SB_ANCHOR(sb)[1] = lastblock - 256;
					}
				}
			}
		}
	}

	if (!lastblock)
	{
		/* We havn't found the lastblock. check 312 */
		if ((bh = sb_bread(sb, 312 + UDF_SB_SESSION(sb))))
		{
			ident = le16_to_cpu(((tag *)bh->b_data)->tagIdent);
			location = le32_to_cpu(((tag *)bh->b_data)->tagLocation);
			udf_release_data(bh);

			if (ident == TAG_IDENT_AVDP && location == 256)
				UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
		}
	}

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	for (i = 0; i < ARRAY_SIZE(UDF_SB_ANCHOR(sb)); i++) {
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		if (UDF_SB_ANCHOR(sb)[i])
		{
			if (!(bh = udf_read_tagged(sb,
				UDF_SB_ANCHOR(sb)[i], UDF_SB_ANCHOR(sb)[i], &ident)))
			{
				UDF_SB_ANCHOR(sb)[i] = 0;
			}
			else
			{
				udf_release_data(bh);
				if ((ident != TAG_IDENT_AVDP) && (i ||
					(ident != TAG_IDENT_FE && ident != TAG_IDENT_EFE)))
				{
					UDF_SB_ANCHOR(sb)[i] = 0;
				}
			}
		}
	}

	UDF_SB_LASTBLOCK(sb) = lastblock;
}

static int 
udf_find_fileset(struct super_block *sb, kernel_lb_addr *fileset, kernel_lb_addr *root)
{
	struct buffer_head *bh = NULL;
	long lastblock;
	uint16_t ident;

	if (fileset->logicalBlockNum != 0xFFFFFFFF ||
		fileset->partitionReferenceNum != 0xFFFF)
	{
		bh = udf_read_ptagged(sb, *fileset, 0, &ident);

		if (!bh)
			return 1;
		else if (ident != TAG_IDENT_FSD)
		{
			udf_release_data(bh);
			return 1;
		}
			
	}

	if (!bh) /* Search backwards through the partitions */
	{
		kernel_lb_addr newfileset;

		return 1;
		
		for (newfileset.partitionReferenceNum=UDF_SB_NUMPARTS(sb)-1;
			(newfileset.partitionReferenceNum != 0xFFFF &&
				fileset->logicalBlockNum == 0xFFFFFFFF &&
				fileset->partitionReferenceNum == 0xFFFF);
			newfileset.partitionReferenceNum--)
		{
			lastblock = UDF_SB_PARTLEN(sb, newfileset.partitionReferenceNum);
			newfileset.logicalBlockNum = 0;

			do
			{
				bh = udf_read_ptagged(sb, newfileset, 0, &ident);
				if (!bh)
				{
					newfileset.logicalBlockNum ++;
					continue;
				}

				switch (ident)
				{
					case TAG_IDENT_SBD:
					{
						struct spaceBitmapDesc *sp;
						sp = (struct spaceBitmapDesc *)bh->b_data;
						newfileset.logicalBlockNum += 1 +
							((le32_to_cpu(sp->numOfBytes) + sizeof(struct spaceBitmapDesc) - 1)
								>> sb->s_blocksize_bits);
						udf_release_data(bh);
						break;
					}
					case TAG_IDENT_FSD:
					{
						*fileset = newfileset;
						break;
					}
					default:
					{
						newfileset.logicalBlockNum ++;
						udf_release_data(bh);
						bh = NULL;
						break;
					}
				}
			}
			while (newfileset.logicalBlockNum < lastblock &&
				fileset->logicalBlockNum == 0xFFFFFFFF &&
				fileset->partitionReferenceNum == 0xFFFF);
		}
	}

	if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
		fileset->partitionReferenceNum != 0xFFFF) && bh)
	{
		udf_debug("Fileset at block=%d, partition=%d\n",
			fileset->logicalBlockNum, fileset->partitionReferenceNum);

		UDF_SB_PARTITION(sb) = fileset->partitionReferenceNum;
		udf_load_fileset(sb, bh, root);
		udf_release_data(bh);
		return 0;
	}
	return 1;
}

static void 
udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
{
	struct primaryVolDesc *pvoldesc;
	time_t recording;
	long recording_usec;
	struct ustr instr;
	struct ustr outstr;

	pvoldesc = (struct primaryVolDesc *)bh->b_data;

	if ( udf_stamp_to_time(&recording, &recording_usec,
		lets_to_cpu(pvoldesc->recordingDateAndTime)) )
	{
		kernel_timestamp ts;
		ts = lets_to_cpu(pvoldesc->recordingDateAndTime);
		udf_debug("recording time %ld/%ld, %04u/%02u/%02u %02u:%02u (%x)\n",
			recording, recording_usec,
			ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.typeAndTimezone);
		UDF_SB_RECORDTIME(sb).tv_sec = recording;
		UDF_SB_RECORDTIME(sb).tv_nsec = recording_usec * 1000;
	}

	if ( !udf_build_ustr(&instr, pvoldesc->volIdent, 32) )
	{
		if (udf_CS0toUTF8(&outstr, &instr))
		{
			strncpy( UDF_SB_VOLIDENT(sb), outstr.u_name,
				outstr.u_len > 31 ? 31 : outstr.u_len);
			udf_debug("volIdent[] = '%s'\n", UDF_SB_VOLIDENT(sb));
		}
	}

	if ( !udf_build_ustr(&instr, pvoldesc->volSetIdent, 128) )
	{
		if (udf_CS0toUTF8(&outstr, &instr))
			udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
	}
}

static void 
udf_load_fileset(struct super_block *sb, struct buffer_head *bh, kernel_lb_addr *root)
{
	struct fileSetDesc *fset;

	fset = (struct fileSetDesc *)bh->b_data;

	*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);

	UDF_SB_SERIALNUM(sb) = le16_to_cpu(fset->descTag.tagSerialNum);

	udf_debug("Rootdir at block=%d, partition=%d\n", 
		root->logicalBlockNum, root->partitionReferenceNum);
}

static void 
udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
{
	struct partitionDesc *p;
	int i;

	p = (struct partitionDesc *)bh->b_data;

	for (i=0; i<UDF_SB_NUMPARTS(sb); i++)
	{
		udf_debug("Searching map: (%d == %d)\n", 
			UDF_SB_PARTMAPS(sb)[i].s_partition_num, le16_to_cpu(p->partitionNumber));
		if (UDF_SB_PARTMAPS(sb)[i].s_partition_num == le16_to_cpu(p->partitionNumber))
		{
			UDF_SB_PARTLEN(sb,i) = le32_to_cpu(p->partitionLength); /* blocks */
			UDF_SB_PARTROOT(sb,i) = le32_to_cpu(p->partitionStartingLocation);
			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_READ_ONLY)
				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_READ_ONLY;
			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_WRITE_ONCE)
				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_WRITE_ONCE;
			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_REWRITABLE)
				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_REWRITABLE;
			if (le32_to_cpu(p->accessType) == PD_ACCESS_TYPE_OVERWRITABLE)
				UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_OVERWRITABLE;

			if (!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) ||
				!strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
			{
				struct partitionHeaderDesc *phd;

				phd = (struct partitionHeaderDesc *)(p->partitionContentsUse);
				if (phd->unallocSpaceTable.extLength)
				{
					kernel_lb_addr loc = { le32_to_cpu(phd->unallocSpaceTable.extPosition), i };

					UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table =
						udf_iget(sb, loc);
					UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_TABLE;
					udf_debug("unallocSpaceTable (part %d) @ %ld\n",
						i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_table->i_ino);
				}
				if (phd->unallocSpaceBitmap.extLength)
				{
					UDF_SB_ALLOC_BITMAP(sb, i, s_uspace);
					if (UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap != NULL)
					{
						UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extLength =
							le32_to_cpu(phd->unallocSpaceBitmap.extLength);
						UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition =
							le32_to_cpu(phd->unallocSpaceBitmap.extPosition);
						UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_UNALLOC_BITMAP;
						udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
							i, UDF_SB_PARTMAPS(sb)[i].s_uspace.s_bitmap->s_extPosition);
					}
				}
				if (phd->partitionIntegrityTable.extLength)
					udf_debug("partitionIntegrityTable (part %d)\n", i);
				if (phd->freedSpaceTable.extLength)
				{
					kernel_lb_addr loc = { le32_to_cpu(phd->freedSpaceTable.extPosition), i };

					UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table =
						udf_iget(sb, loc);
					UDF_SB_PARTFLAGS(sb,i) |= UDF_PART_FLAG_FREED_TABLE;
					udf_debug("freedSpaceTable (part %d) @ %ld\n",
						i, UDF_SB_PARTMAPS(sb)[i].s_fspace.s_table->i_ino);
				}
				if (phd->freedSpaceBitmap.extLength)
				{
					UDF_SB_ALLOC_BITMAP(sb, i, s_fspace);
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