Initial import

1 files changed, 2469 insertions, 0 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
new file mode 100644
index 000000000..6299f3419
--- /dev/null
+++ b/fs/udf/super.c
@@ -0,0 +1,2469 @@
+/*
+ * 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/vfs.h>
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
+#include <linux/bitmap.h>
+#include <linux/crc-itu-t.h>
+#include <linux/log2.h>
+#include <asm/byteorder.h>
+
+#include "udf_sb.h"
+#include "udf_i.h"
+
+#include <linux/init.h>
+#include <linux/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
+
+#define UDF_DEFAULT_BLOCKSIZE 2048
+
+#define VSD_FIRST_SECTOR_OFFSET		32768
+#define VSD_MAX_SECTOR_OFFSET		0x800000
+
+enum { UDF_MAX_LINKS = 0xffff };
+
+/* 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 int udf_sync_fs(struct super_block *, int);
+static int udf_remount_fs(struct super_block *, int *, char *);
+static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
+static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
+			    struct kernel_lb_addr *);
+static void udf_load_fileset(struct super_block *, struct buffer_head *,
+			     struct kernel_lb_addr *);
+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 *);
+static int udf_statfs(struct dentry *, struct kstatfs *);
+static int udf_show_options(struct seq_file *, struct dentry *);
+
+struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
+{
+	struct logicalVolIntegrityDesc *lvid;
+	unsigned int partnum;
+	unsigned int offset;
+
+	if (!UDF_SB(sb)->s_lvid_bh)
+		return NULL;
+	lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
+	partnum = le32_to_cpu(lvid->numOfPartitions);
+	if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
+	     offsetof(struct logicalVolIntegrityDesc, impUse)) /
+	     (2 * sizeof(uint32_t)) < partnum) {
+		udf_err(sb, "Logical volume integrity descriptor corrupted "
+			"(numOfPartitions = %u)!\n", partnum);
+		return NULL;
+	}
+	/* The offset is to skip freeSpaceTable and sizeTable arrays */
+	offset = partnum * 2 * sizeof(uint32_t);
+	return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
+}
+
+/* UDF filesystem type */
+static struct dentry *udf_mount(struct file_system_type *fs_type,
+		      int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
+}
+
+static struct file_system_type udf_fstype = {
+	.owner		= THIS_MODULE,
+	.name		= "udf",
+	.mount		= udf_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("udf");
+
+static struct kmem_cache *udf_inode_cachep;
+
+static struct inode *udf_alloc_inode(struct super_block *sb)
+{
+	struct udf_inode_info *ei;
+	ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
+	if (!ei)
+		return NULL;
+
+	ei->i_unique = 0;
+	ei->i_lenExtents = 0;
+	ei->i_next_alloc_block = 0;
+	ei->i_next_alloc_goal = 0;
+	ei->i_strat4096 = 0;
+	init_rwsem(&ei->i_data_sem);
+	ei->cached_extent.lstart = -1;
+	spin_lock_init(&ei->i_extent_cache_lock);
+
+	return &ei->vfs_inode;
+}
+
+static void udf_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(udf_inode_cachep, UDF_I(inode));
+}
+
+static void udf_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, udf_i_callback);
+}
+
+static void init_once(void *foo)
+{
+	struct udf_inode_info *ei = (struct udf_inode_info *)foo;
+
+	ei->i_ext.i_data = NULL;
+	inode_init_once(&ei->vfs_inode);
+}
+
+static int __init init_inodecache(void)
+{
+	udf_inode_cachep = kmem_cache_create("udf_inode_cache",
+					     sizeof(struct udf_inode_info),
+					     0, (SLAB_RECLAIM_ACCOUNT |
+						 SLAB_MEM_SPREAD),
+					     init_once);
+	if (!udf_inode_cachep)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(udf_inode_cachep);
+}
+
+/* Superblock operations */
+static const struct super_operations udf_sb_ops = {
+	.alloc_inode	= udf_alloc_inode,
+	.destroy_inode	= udf_destroy_inode,
+	.write_inode	= udf_write_inode,
+	.evict_inode	= udf_evict_inode,
+	.put_super	= udf_put_super,
+	.sync_fs	= udf_sync_fs,
+	.statfs		= udf_statfs,
+	.remount_fs	= udf_remount_fs,
+	.show_options	= udf_show_options,
+};
+
+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;
+	umode_t umask;
+	kgid_t gid;
+	kuid_t uid;
+	umode_t fmode;
+	umode_t dmode;
+	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)
+
+static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+
+	sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map),
+				  GFP_KERNEL);
+	if (!sbi->s_partmaps) {
+		udf_err(sb, "Unable to allocate space for %d partition maps\n",
+			count);
+		sbi->s_partitions = 0;
+		return -ENOMEM;
+	}
+
+	sbi->s_partitions = count;
+	return 0;
+}
+
+static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
+{
+	int i;
+	int nr_groups = bitmap->s_nr_groups;
+	int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
+						nr_groups);
+
+	for (i = 0; i < nr_groups; i++)
+		if (bitmap->s_block_bitmap[i])
+			brelse(bitmap->s_block_bitmap[i]);
+
+	if (size <= PAGE_SIZE)
+		kfree(bitmap);
+	else
+		vfree(bitmap);
+}
+
+static void udf_free_partition(struct udf_part_map *map)
+{
+	int i;
+	struct udf_meta_data *mdata;
+
+	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
+		iput(map->s_uspace.s_table);
+	if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE)
+		iput(map->s_fspace.s_table);
+	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
+		udf_sb_free_bitmap(map->s_uspace.s_bitmap);
+	if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP)
+		udf_sb_free_bitmap(map->s_fspace.s_bitmap);
+	if (map->s_partition_type == UDF_SPARABLE_MAP15)
+		for (i = 0; i < 4; i++)
+			brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
+	else if (map->s_partition_type == UDF_METADATA_MAP25) {
+		mdata = &map->s_type_specific.s_metadata;
+		iput(mdata->s_metadata_fe);
+		mdata->s_metadata_fe = NULL;
+
+		iput(mdata->s_mirror_fe);
+		mdata->s_mirror_fe = NULL;
+
+		iput(mdata->s_bitmap_fe);
+		mdata->s_bitmap_fe = NULL;
+	}
+}
+
+static void udf_sb_free_partitions(struct super_block *sb)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	int i;
+	if (sbi->s_partmaps == NULL)
+		return;
+	for (i = 0; i < sbi->s_partitions; i++)
+		udf_free_partition(&sbi->s_partmaps[i]);
+	kfree(sbi->s_partmaps);
+	sbi->s_partmaps = NULL;
+}
+
+static int udf_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct super_block *sb = root->d_sb;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+
+	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
+		seq_puts(seq, ",nostrict");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
+		seq_printf(seq, ",bs=%lu", sb->s_blocksize);
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+		seq_puts(seq, ",unhide");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+		seq_puts(seq, ",undelete");
+	if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
+		seq_puts(seq, ",noadinicb");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
+		seq_puts(seq, ",shortad");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
+		seq_puts(seq, ",uid=forget");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE))
+		seq_puts(seq, ",uid=ignore");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
+		seq_puts(seq, ",gid=forget");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
+		seq_puts(seq, ",gid=ignore");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
+		seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
+		seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
+	if (sbi->s_umask != 0)
+		seq_printf(seq, ",umask=%ho", sbi->s_umask);
+	if (sbi->s_fmode != UDF_INVALID_MODE)
+		seq_printf(seq, ",mode=%ho", sbi->s_fmode);
+	if (sbi->s_dmode != UDF_INVALID_MODE)
+		seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
+		seq_printf(seq, ",session=%u", sbi->s_session);
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
+		seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
+	if (sbi->s_anchor != 0)
+		seq_printf(seq, ",anchor=%u", sbi->s_anchor);
+	/*
+	 * volume, partition, fileset and rootdir seem to be ignored
+	 * currently
+	 */
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
+		seq_puts(seq, ",utf8");
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
+		seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
+
+	return 0;
+}
+
+/*
+ * udf_parse_options
+ *
+ * PURPOSE
+ *	Parse mount options.
+ *
+ * DESCRIPTION
+ *	The following mount options are supported:
+ *
+ *	gid=		Set the default group.
+ *	umask=		Set the default umask.
+ *	mode=		Set the default file permissions.
+ *	dmode=		Set the default directory permissions.
+ *	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,
+	Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
+	Opt_fmode, Opt_dmode
+};
+
+static const 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"},
+	{Opt_uforget,	"uid=forget"},
+	{Opt_uignore,	"uid=ignore"},
+	{Opt_gforget,	"gid=forget"},
+	{Opt_gignore,	"gid=ignore"},
+	{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_fmode,     "mode=%o"},
+	{Opt_dmode,     "dmode=%o"},
+	{Opt_err,	NULL}
+};
+
+static int udf_parse_options(char *options, struct udf_options *uopt,
+			     bool remount)
+{
+	char *p;
+	int option;
+
+	uopt->novrs = 0;
+	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;
+		unsigned n;
+		if (!*p)
+			continue;
+
+		token = match_token(p, tokens, args);
+		switch (token) {
+		case Opt_novrs:
+			uopt->novrs = 1;
+			break;
+		case Opt_bs:
+			if (match_int(&args[0], &option))
+				return 0;
+			n = option;
+			if (n != 512 && n != 1024 && n != 2048 && n != 4096)
+				return 0;
+			uopt->blocksize = n;
+			uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
+			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 = make_kgid(current_user_ns(), option);
+			if (!gid_valid(uopt->gid))
+				return 0;
+			uopt->flags |= (1 << UDF_FLAG_GID_SET);
+			break;
+		case Opt_uid:
+			if (match_int(args, &option))
+				return 0;
+			uopt->uid = make_kuid(current_user_ns(), option);
+			if (!uid_valid(uopt->uid))
+				return 0;
+			uopt->flags |= (1 << UDF_FLAG_UID_SET);
+			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;
+			if (!remount)
+				uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
+			break;
+		case Opt_lastblock:
+			if (match_int(args, &option))
+				return 0;
+			uopt->lastblock = option;
+			if (!remount)
+				uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
+			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
+		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;
+		case Opt_fmode:
+			if (match_octal(args, &option))
+				return 0;
+			uopt->fmode = option & 0777;
+			break;
+		case Opt_dmode:
+			if (match_octal(args, &option))
+				return 0;
+			uopt->dmode = option & 0777;
+			break;
+		default:
+			pr_err("bad mount option \"%s\" or missing value\n", p);
+			return 0;
+		}
+	}
+	return 1;
+}
+
+static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
+{
+	struct udf_options uopt;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	int error = 0;
+	struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
+
+	sync_filesystem(sb);
+	if (lvidiu) {
+		int write_rev = le16_to_cpu(lvidiu->minUDFWriteRev);
+		if (write_rev > UDF_MAX_WRITE_VERSION && !(*flags & MS_RDONLY))
+			return -EACCES;
+	}
+
+	uopt.flags = sbi->s_flags;
+	uopt.uid   = sbi->s_uid;
+	uopt.gid   = sbi->s_gid;
+	uopt.umask = sbi->s_umask;
+	uopt.fmode = sbi->s_fmode;
+	uopt.dmode = sbi->s_dmode;
+
+	if (!udf_parse_options(options, &uopt, true))
+		return -EINVAL;
+
+	write_lock(&sbi->s_cred_lock);
+	sbi->s_flags = uopt.flags;
+	sbi->s_uid   = uopt.uid;
+	sbi->s_gid   = uopt.gid;
+	sbi->s_umask = uopt.umask;
+	sbi->s_fmode = uopt.fmode;
+	sbi->s_dmode = uopt.dmode;
+	write_unlock(&sbi->s_cred_lock);
+
+	if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
+		goto out_unlock;
+
+	if (*flags & MS_RDONLY)
+		udf_close_lvid(sb);
+	else
+		udf_open_lvid(sb);
+
+out_unlock:
+	return error;
+}
+
+/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
+/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
+static loff_t udf_check_vsd(struct super_block *sb)
+{
+	struct volStructDesc *vsd = NULL;
+	loff_t sector = VSD_FIRST_SECTOR_OFFSET;
+	int sectorsize;
+	struct buffer_head *bh = NULL;
+	int nsr02 = 0;
+	int nsr03 = 0;
+	struct udf_sb_info *sbi;
+
+	sbi = UDF_SB(sb);
+	if (sb->s_blocksize < sizeof(struct volStructDesc))
+		sectorsize = sizeof(struct volStructDesc);
+	else
+		sectorsize = sb->s_blocksize;
+
+	sector += (sbi->s_session << sb->s_blocksize_bits);
+
+	udf_debug("Starting at sector %u (%ld byte sectors)\n",
+		  (unsigned int)(sector >> sb->s_blocksize_bits),
+		  sb->s_blocksize);
+	/* Process the sequence (if applicable). The hard limit on the sector
+	 * offset is arbitrary, hopefully large enough so that all valid UDF
+	 * filesystems will be recognised. There is no mention of an upper
+	 * bound to the size of the volume recognition area in the standard.
+	 *  The limit will prevent the code to read all the sectors of a
+	 * specially crafted image (like a bluray disc full of CD001 sectors),
+	 * potentially causing minutes or even hours of uninterruptible I/O
+	 * activity. This actually happened with uninitialised SSD partitions
+	 * (all 0xFF) before the check for the limit and all valid IDs were
+	 * added */
+	for (; !nsr02 && !nsr03 && sector < VSD_MAX_SECTOR_OFFSET;
+	     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 (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001,
+				    VSD_STD_ID_LEN)) {
+			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))
+			; /* nothing */
+		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
+				    VSD_STD_ID_LEN)) {
+			brelse(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;
+		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BOOT2,
+				    VSD_STD_ID_LEN))
+			; /* nothing */
+		else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CDW02,
+				    VSD_STD_ID_LEN))
+			; /* nothing */
+		else {
+			/* invalid id : end of volume recognition area */
+			brelse(bh);
+			break;
+		}
+		brelse(bh);
+	}
+
+	if (nsr03)
+		return nsr03;
+	else if (nsr02)
+		return nsr02;
+	else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
+			VSD_FIRST_SECTOR_OFFSET)
+		return -1;
+	else
+		return 0;
+}
+
+static int udf_find_fileset(struct super_block *sb,
+			    struct kernel_lb_addr *fileset,
+			    struct kernel_lb_addr *root)
+{
+	struct buffer_head *bh = NULL;
+	long lastblock;
+	uint16_t ident;
+	struct udf_sb_info *sbi;
+
+	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) {
+			brelse(bh);
+			return 1;
+		}
+
+	}
+
+	sbi = UDF_SB(sb);
+	if (!bh) {
+		/* Search backwards through the partitions */
+		struct kernel_lb_addr newfileset;
+
+/* --> cvg: FIXME - is it reasonable? */
+		return 1;
+
+		for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
+		     (newfileset.partitionReferenceNum != 0xFFFF &&
+		      fileset->logicalBlockNum == 0xFFFFFFFF &&
+		      fileset->partitionReferenceNum == 0xFFFF);
+		     newfileset.partitionReferenceNum--) {
+			lastblock = sbi->s_partmaps
+					[newfileset.partitionReferenceNum]
+						.s_partition_len;
+			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);
+					brelse(bh);
+					break;
+				}
+				case TAG_IDENT_FSD:
+					*fileset = newfileset;
+					break;
+				default:
+					newfileset.logicalBlockNum++;
+					brelse(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);
+
+		sbi->s_partition = fileset->partitionReferenceNum;
+		udf_load_fileset(sb, bh, root);
+		brelse(bh);
+		return 0;
+	}
+	return 1;
+}
+
+/*
+ * Load primary Volume Descriptor Sequence
+ *
+ * Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
+ * should be tried.
+ */
+static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
+{
+	struct primaryVolDesc *pvoldesc;
+	struct ustr *instr, *outstr;
+	struct buffer_head *bh;
+	uint16_t ident;
+	int ret = -ENOMEM;
+
+	instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
+	if (!instr)
+		return -ENOMEM;
+
+	outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
+	if (!outstr)
+		goto out1;
+
+	bh = udf_read_tagged(sb, block, block, &ident);
+	if (!bh) {
+		ret = -EAGAIN;
+		goto out2;
+	}
+
+	if (ident != TAG_IDENT_PVD) {
+		ret = -EIO;
+		goto out_bh;
+	}
+
+	pvoldesc = (struct primaryVolDesc *)bh->b_data;
+
+	if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
+			      pvoldesc->recordingDateAndTime)) {
+#ifdef UDFFS_DEBUG
+		struct timestamp *ts = &pvoldesc->recordingDateAndTime;
+		udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
+			  le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
+			  ts->minute, le16_to_cpu(ts->typeAndTimezone));
+#endif
+	}
+
+	if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
+		if (udf_CS0toUTF8(outstr, instr)) {
+			strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
+				outstr->u_len > 31 ? 31 : outstr->u_len);
+			udf_debug("volIdent[] = '%s'\n",
+				  UDF_SB(sb)->s_volume_ident);
+		}
+
+	if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
+		if (udf_CS0toUTF8(outstr, instr))
+			udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
+
+	ret = 0;
+out_bh:
+	brelse(bh);
+out2:
+	kfree(outstr);
+out1:
+	kfree(instr);
+	return ret;
+}
+
+struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
+					u32 meta_file_loc, u32 partition_num)
+{
+	struct kernel_lb_addr addr;
+	struct inode *metadata_fe;
+
+	addr.logicalBlockNum = meta_file_loc;
+	addr.partitionReferenceNum = partition_num;
+
+	metadata_fe = udf_iget_special(sb, &addr);
+
+	if (IS_ERR(metadata_fe)) {
+		udf_warn(sb, "metadata inode efe not found\n");
+		return metadata_fe;
+	}
+	if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
+		udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
+		iput(metadata_fe);
+		return ERR_PTR(-EIO);
+	}
+
+	return metadata_fe;
+}
+
+static int udf_load_metadata_files(struct super_block *sb, int partition)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct udf_part_map *map;
+	struct udf_meta_data *mdata;
+	struct kernel_lb_addr addr;
+	struct inode *fe;
+
+	map = &sbi->s_partmaps[partition];
+	mdata = &map->s_type_specific.s_metadata;
+
+	/* metadata address */
+	udf_debug("Metadata file location: block = %d part = %d\n",
+		  mdata->s_meta_file_loc, map->s_partition_num);
+
+	fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
+					 map->s_partition_num);
+	if (IS_ERR(fe)) {
+		/* mirror file entry */
+		udf_debug("Mirror metadata file location: block = %d part = %d\n",
+			  mdata->s_mirror_file_loc, map->s_partition_num);
+
+		fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
+						 map->s_partition_num);
+
+		if (IS_ERR(fe)) {
+			udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
+			return PTR_ERR(fe);
+		}
+		mdata->s_mirror_fe = fe;
+	} else
+		mdata->s_metadata_fe = fe;
+
+
+	/*
+	 * bitmap file entry
+	 * Note:
+	 * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
+	*/
+	if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
+		addr.logicalBlockNum = mdata->s_bitmap_file_loc;
+		addr.partitionReferenceNum = map->s_partition_num;
+
+		udf_debug("Bitmap file location: block = %d part = %d\n",
+			  addr.logicalBlockNum, addr.partitionReferenceNum);
+
+		fe = udf_iget_special(sb, &addr);
+		if (IS_ERR(fe)) {
+			if (sb->s_flags & MS_RDONLY)
+				udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
+			else {
+				udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
+				return PTR_ERR(fe);
+			}
+		} else
+			mdata->s_bitmap_fe = fe;
+	}
+
+	udf_debug("udf_load_metadata_files Ok\n");
+	return 0;
+}
+
+static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
+			     struct kernel_lb_addr *root)
+{
+	struct fileSetDesc *fset;
+
+	fset = (struct fileSetDesc *)bh->b_data;
+
+	*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
+
+	UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
+
+	udf_debug("Rootdir at block=%d, partition=%d\n",
+		  root->logicalBlockNum, root->partitionReferenceNum);
+}
+
+int udf_compute_nr_groups(struct super_block *sb, u32 partition)
+{
+	struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
+	return DIV_ROUND_UP(map->s_partition_len +
+			    (sizeof(struct spaceBitmapDesc) << 3),
+			    sb->s_blocksize * 8);
+}
+
+static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
+{
+	struct udf_bitmap *bitmap;
+	int nr_groups;
+	int size;
+
+	nr_groups = udf_compute_nr_groups(sb, index);
+	size = sizeof(struct udf_bitmap) +
+		(sizeof(struct buffer_head *) * nr_groups);
+
+	if (size <= PAGE_SIZE)
+		bitmap = kzalloc(size, GFP_KERNEL);
+	else
+		bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
+
+	if (bitmap == NULL)
+		return NULL;
+
+	bitmap->s_nr_groups = nr_groups;
+	return bitmap;
+}
+
+static int udf_fill_partdesc_info(struct super_block *sb,
+		struct partitionDesc *p, int p_index)
+{
+	struct udf_part_map *map;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct partitionHeaderDesc *phd;
+
+	map = &sbi->s_partmaps[p_index];
+
+	map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
+	map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
+
+	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
+		map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
+	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
+		map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
+	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
+		map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
+	if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
+		map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
+
+	udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
+		  p_index, map->s_partition_type,
+		  map->s_partition_root, map->s_partition_len);
+
+	if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
+	    strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
+		return 0;
+
+	phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
+	if (phd->unallocSpaceTable.extLength) {
+		struct kernel_lb_addr loc = {
+			.logicalBlockNum = le32_to_cpu(
+				phd->unallocSpaceTable.extPosition),
+			.partitionReferenceNum = p_index,
+		};
+		struct inode *inode;
+
+		inode = udf_iget_special(sb, &loc);
+		if (IS_ERR(inode)) {
+			udf_debug("cannot load unallocSpaceTable (part %d)\n",
+				  p_index);
+			return PTR_ERR(inode);
+		}
+		map->s_uspace.s_table = inode;
+		map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
+		udf_debug("unallocSpaceTable (part %d) @ %ld\n",
+			  p_index, map->s_uspace.s_table->i_ino);
+	}
+
+	if (phd->unallocSpaceBitmap.extLength) {
+		struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
+		if (!bitmap)
+			return -ENOMEM;
+		map->s_uspace.s_bitmap = bitmap;
+		bitmap->s_extPosition = le32_to_cpu(
+				phd->unallocSpaceBitmap.extPosition);
+		map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
+		udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
+			  p_index, bitmap->s_extPosition);
+	}
+
+	if (phd->partitionIntegrityTable.extLength)
+		udf_debug("partitionIntegrityTable (part %d)\n", p_index);
+
+	if (phd->freedSpaceTable.extLength) {
+		struct kernel_lb_addr loc = {
+			.logicalBlockNum = le32_to_cpu(
+				phd->freedSpaceTable.extPosition),
+			.partitionReferenceNum = p_index,
+		};
+		struct inode *inode;
+
+		inode = udf_iget_special(sb, &loc);
+		if (IS_ERR(inode)) {
+			udf_debug("cannot load freedSpaceTable (part %d)\n",
+				  p_index);
+			return PTR_ERR(inode);
+		}
+		map->s_fspace.s_table = inode;
+		map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
+		udf_debug("freedSpaceTable (part %d) @ %ld\n",
+			  p_index, map->s_fspace.s_table->i_ino);
+	}
+
+	if (phd->freedSpaceBitmap.extLength) {
+		struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
+		if (!bitmap)
+			return -ENOMEM;
+		map->s_fspace.s_bitmap = bitmap;
+		bitmap->s_extPosition = le32_to_cpu(
+				phd->freedSpaceBitmap.extPosition);
+		map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
+		udf_debug("freedSpaceBitmap (part %d) @ %d\n",
+			  p_index, bitmap->s_extPosition);
+	}
+	return 0;
+}
+
+static void udf_find_vat_block(struct super_block *sb, int p_index,
+			       int type1_index, sector_t start_block)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct udf_part_map *map = &sbi->s_partmaps[p_index];
+	sector_t vat_block;
+	struct kernel_lb_addr ino;
+	struct inode *inode;
+
+	/*
+	 * VAT file entry is in the last recorded block. Some broken disks have
+	 * it a few blocks before so try a bit harder...
+	 */
+	ino.partitionReferenceNum = type1_index;
+	for (vat_block = start_block;
+	     vat_block >= map->s_partition_root &&
+	     vat_block >= start_block - 3; vat_block--) {
+		ino.logicalBlockNum = vat_block - map->s_partition_root;
+		inode = udf_iget_special(sb, &ino);
+		if (!IS_ERR(inode)) {
+			sbi->s_vat_inode = inode;
+			break;
+		}
+	}
+}
+
+static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct udf_part_map *map = &sbi->s_partmaps[p_index];
+	struct buffer_head *bh = NULL;
+	struct udf_inode_info *vati;
+	uint32_t pos;
+	struct virtualAllocationTable20 *vat20;
+	sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
+
+	udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
+	if (!sbi->s_vat_inode &&
+	    sbi->s_last_block != blocks - 1) {
+		pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
+			  (unsigned long)sbi->s_last_block,
+			  (unsigned long)blocks - 1);
+		udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
+	}
+	if (!sbi->s_vat_inode)
+		return -EIO;
+
+	if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
+		map->s_type_specific.s_virtual.s_start_offset = 0;
+		map->s_type_specific.s_virtual.s_num_entries =
+			(sbi->s_vat_inode->i_size - 36) >> 2;
+	} else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
+		vati = UDF_I(sbi->s_vat_inode);
+		if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
+			pos = udf_block_map(sbi->s_vat_inode, 0);
+			bh = sb_bread(sb, pos);
+			if (!bh)
+				return -EIO;
+			vat20 = (struct virtualAllocationTable20 *)bh->b_data;
+		} else {
+			vat20 = (struct virtualAllocationTable20 *)
+							vati->i_ext.i_data;
+		}
+
+		map->s_type_specific.s_virtual.s_start_offset =
+			le16_to_cpu(vat20->lengthHeader);
+		map->s_type_specific.s_virtual.s_num_entries =
+			(sbi->s_vat_inode->i_size -
+				map->s_type_specific.s_virtual.
+					s_start_offset) >> 2;
+		brelse(bh);
+	}
+	return 0;
+}
+
+/*
+ * Load partition descriptor block
+ *
+ * Returns <0 on error, 0 on success, -EAGAIN is special - try next descriptor
+ * sequence.
+ */
+static int udf_load_partdesc(struct super_block *sb, sector_t block)
+{
+	struct buffer_head *bh;
+	struct partitionDesc *p;
+	struct udf_part_map *map;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	int i, type1_idx;
+	uint16_t partitionNumber;
+	uint16_t ident;
+	int ret;
+
+	bh = udf_read_tagged(sb, block, block, &ident);
+	if (!bh)
+		return -EAGAIN;
+	if (ident != TAG_IDENT_PD) {
+		ret = 0;
+		goto out_bh;
+	}
+
+	p = (struct partitionDesc *)bh->b_data;
+	partitionNumber = le16_to_cpu(p->partitionNumber);
+
+	/* First scan for TYPE1, SPARABLE and METADATA partitions */
+	for (i = 0; i < sbi->s_partitions; i++) {
+		map = &sbi->s_partmaps[i];
+		udf_debug("Searching map: (%d == %d)\n",
+			  map->s_partition_num, partitionNumber);
+		if (map->s_partition_num == partitionNumber &&
+		    (map->s_partition_type == UDF_TYPE1_MAP15 ||
+		     map->s_partition_type == UDF_SPARABLE_MAP15))
+			break;
+	}
+
+	if (i >= sbi->s_partitions) {
+		udf_debug("Partition (%d) not found in partition map\n",
+			  partitionNumber);
+		ret = 0;
+		goto out_bh;
+	}
+
+	ret = udf_fill_partdesc_info(sb, p, i);
+	if (ret < 0)
+		goto out_bh;
+
+	/*
+	 * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
+	 * PHYSICAL partitions are already set up
+	 */
+	type1_idx = i;
+#ifdef UDFFS_DEBUG
+	map = NULL; /* supress 'maybe used uninitialized' warning */
+#endif
+	for (i = 0; i < sbi->s_partitions; i++) {
+		map = &sbi->s_partmaps[i];
+
+		if (map->s_partition_num == partitionNumber &&
+		    (map->s_partition_type == UDF_VIRTUAL_MAP15 ||
+		     map->s_partition_type == UDF_VIRTUAL_MAP20 ||
+		     map->s_partition_type == UDF_METADATA_MAP25))
+			break;
+	}
+
+	if (i >= sbi->s_partitions) {
+		ret = 0;
+		goto out_bh;
+	}
+
+	ret = udf_fill_partdesc_info(sb, p, i);
+	if (ret < 0)
+		goto out_bh;
+
+	if (map->s_partition_type == UDF_METADATA_MAP25) {
+		ret = udf_load_metadata_files(sb, i);
+		if (ret < 0) {
+			udf_err(sb, "error loading MetaData partition map %d\n",
+				i);
+			goto out_bh;
+		}
+	} else {
+		/*
+		 * If we have a partition with virtual map, we don't handle
+		 * writing to it (we overwrite blocks instead of relocating
+		 * them).
+		 */
+		if (!(sb->s_flags & MS_RDONLY)) {
+			ret = -EACCES;
+			goto out_bh;
+		}
+		ret = udf_load_vat(sb, i, type1_idx);
+		if (ret < 0)
+			goto out_bh;
+	}
+	ret = 0;
+out_bh:
+	/* In case loading failed, we handle cleanup in udf_fill_super */
+	brelse(bh);
+	return ret;
+}
+
+static int udf_load_sparable_map(struct super_block *sb,
+				 struct udf_part_map *map,
+				 struct sparablePartitionMap *spm)
+{
+	uint32_t loc;
+	uint16_t ident;
+	struct sparingTable *st;
+	struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
+	int i;
+	struct buffer_head *bh;
+
+	map->s_partition_type = UDF_SPARABLE_MAP15;
+	sdata->s_packet_len = le16_to_cpu(spm->packetLength);
+	if (!is_power_of_2(sdata->s_packet_len)) {
+		udf_err(sb, "error loading logical volume descriptor: "
+			"Invalid packet length %u\n",
+			(unsigned)sdata->s_packet_len);
+		return -EIO;
+	}
+	if (spm->numSparingTables > 4) {
+		udf_err(sb, "error loading logical volume descriptor: "
+			"Too many sparing tables (%d)\n",
+			(int)spm->numSparingTables);
+		return -EIO;
+	}
+
+	for (i = 0; i < spm->numSparingTables; i++) {
+		loc = le32_to_cpu(spm->locSparingTable[i]);
+		bh = udf_read_tagged(sb, loc, loc, &ident);
+		if (!bh)
+			continue;
+
+		st = (struct sparingTable *)bh->b_data;
+		if (ident != 0 ||
+		    strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
+			    strlen(UDF_ID_SPARING)) ||
+		    sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
+							sb->s_blocksize) {
+			brelse(bh);
+			continue;
+		}
+
+		sdata->s_spar_map[i] = bh;
+	}
+	map->s_partition_func = udf_get_pblock_spar15;
+	return 0;
+}
+
+static int udf_load_logicalvol(struct super_block *sb, sector_t block,
+			       struct kernel_lb_addr *fileset)
+{
+	struct logicalVolDesc *lvd;
+	int i, offset;
+	uint8_t type;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct genericPartitionMap *gpm;
+	uint16_t ident;
+	struct buffer_head *bh;
+	unsigned int table_len;
+	int ret;
+
+	bh = udf_read_tagged(sb, block, block, &ident);
+	if (!bh)
+		return -EAGAIN;
+	BUG_ON(ident != TAG_IDENT_LVD);
+	lvd = (struct logicalVolDesc *)bh->b_data;
+	table_len = le32_to_cpu(lvd->mapTableLength);
+	if (table_len > sb->s_blocksize - sizeof(*lvd)) {
+		udf_err(sb, "error loading logical volume descriptor: "
+			"Partition table too long (%u > %lu)\n", table_len,
+			sb->s_blocksize - sizeof(*lvd));
+		ret = -EIO;
+		goto out_bh;
+	}
+
+	ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
+	if (ret)
+		goto out_bh;
+
+	for (i = 0, offset = 0;
+	     i < sbi->s_partitions && offset < table_len;
+	     i++, offset += gpm->partitionMapLength) {
+		struct udf_part_map *map = &sbi->s_partmaps[i];
+		gpm = (struct genericPartitionMap *)
+				&(lvd->partitionMaps[offset]);
+		type = gpm->partitionMapType;
+		if (type == 1) {
+			struct genericPartitionMap1 *gpm1 =
+				(struct genericPartitionMap1 *)gpm;
+			map->s_partition_type = UDF_TYPE1_MAP15;
+			map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
+			map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
+			map->s_partition_func = NULL;
+		} else if (type == 2) {
+			struct udfPartitionMap2 *upm2 =
+						(struct udfPartitionMap2 *)gpm;
+			if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
+						strlen(UDF_ID_VIRTUAL))) {
+				u16 suf =
+					le16_to_cpu(((__le16 *)upm2->partIdent.
+							identSuffix)[0]);
+				if (suf < 0x0200) {
+					map->s_partition_type =
+							UDF_VIRTUAL_MAP15;
+					map->s_partition_func =
+							udf_get_pblock_virt15;
+				} else {
+					map->s_partition_type =
+							UDF_VIRTUAL_MAP20;
+					map->s_partition_func =
+							udf_get_pblock_virt20;
+				}
+			} else if (!strncmp(upm2->partIdent.ident,
+						UDF_ID_SPARABLE,
+						strlen(UDF_ID_SPARABLE))) {
+				ret = udf_load_sparable_map(sb, map,
+					(struct sparablePartitionMap *)gpm);
+				if (ret < 0)
+					goto out_bh;
+			} else if (!strncmp(upm2->partIdent.ident,
+						UDF_ID_METADATA,
+						strlen(UDF_ID_METADATA))) {
+				struct udf_meta_data *mdata =
+					&map->s_type_specific.s_metadata;
+				struct metadataPartitionMap *mdm =
+						(struct metadataPartitionMap *)
+						&(lvd->partitionMaps[offset]);
+				udf_debug("Parsing Logical vol part %d type %d  id=%s\n",
+					  i, type, UDF_ID_METADATA);
+
+				map->s_partition_type = UDF_METADATA_MAP25;
+				map->s_partition_func = udf_get_pblock_meta25;
+
+				mdata->s_meta_file_loc   =
+					le32_to_cpu(mdm->metadataFileLoc);
+				mdata->s_mirror_file_loc =
+					le32_to_cpu(mdm->metadataMirrorFileLoc);
+				mdata->s_bitmap_file_loc =
+					le32_to_cpu(mdm->metadataBitmapFileLoc);
+				mdata->s_alloc_unit_size =
+					le32_to_cpu(mdm->allocUnitSize);
+				mdata->s_align_unit_size =
+					le16_to_cpu(mdm->alignUnitSize);
+				if (mdm->flags & 0x01)
+					mdata->s_flags |= MF_DUPLICATE_MD;
+
+				udf_debug("Metadata Ident suffix=0x%x\n",
+					  le16_to_cpu(*(__le16 *)
+						      mdm->partIdent.identSuffix));
+				udf_debug("Metadata part num=%d\n",
+					  le16_to_cpu(mdm->partitionNum));
+				udf_debug("Metadata part alloc unit size=%d\n",
+					  le32_to_cpu(mdm->allocUnitSize));
+				udf_debug("Metadata file loc=%d\n",
+					  le32_to_cpu(mdm->metadataFileLoc));
+				udf_debug("Mirror file loc=%d\n",
+					  le32_to_cpu(mdm->metadataMirrorFileLoc));
+				udf_debug("Bitmap file loc=%d\n",
+					  le32_to_cpu(mdm->metadataBitmapFileLoc));
+				udf_debug("Flags: %d %d\n",
+					  mdata->s_flags, mdm->flags);
+			} else {
+				udf_debug("Unknown ident: %s\n",
+					  upm2->partIdent.ident);
+				continue;
+			}
+			map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
+			map->s_partition_num = le16_to_cpu(upm2->partitionNum);
+		}
+		udf_debug("Partition (%d:%d) type %d on volume %d\n",
+			  i, map->s_partition_num, type, map->s_volumeseqnum);
+	}
+
+	if (fileset) {
+		struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
+
+		*fileset = lelb_to_cpu(la->extLocation);
+		udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
+			  fileset->logicalBlockNum,
+			  fileset->partitionReferenceNum);
+	}
+	if (lvd->integritySeqExt.extLength)
+		udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
+	ret = 0;
+out_bh:
+	brelse(bh);
+	return ret;
+}
+
+/*
+ * udf_load_logicalvolint
+ *
+ */
+static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
+{
+	struct buffer_head *bh = NULL;
+	uint16_t ident;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct logicalVolIntegrityDesc *lvid;
+
+	while (loc.extLength > 0 &&
+	       (bh = udf_read_tagged(sb, loc.extLocation,
+				     loc.extLocation, &ident)) &&
+	       ident == TAG_IDENT_LVID) {
+		sbi->s_lvid_bh = bh;
+		lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+
+		if (lvid->nextIntegrityExt.extLength)
+			udf_load_logicalvolint(sb,
+				leea_to_cpu(lvid->nextIntegrityExt));
+
+		if (sbi->s_lvid_bh != bh)
+			brelse(bh);
+		loc.extLength -= sb->s_blocksize;
+		loc.extLocation++;
+	}
+	if (sbi->s_lvid_bh != bh)
+		brelse(bh);
+}
+
+/*
+ * Process a main/reserve volume descriptor sequence.
+ *   @block		First block of first extent of the sequence.
+ *   @lastblock		Lastblock of first extent of the sequence.
+ *   @fileset		There we store extent containing root fileset
+ *
+ * Returns <0 on error, 0 on success. -EAGAIN is special - try next descriptor
+ * sequence
+ */
+static noinline int udf_process_sequence(
+		struct super_block *sb,
+		sector_t block, sector_t lastblock,
+		struct kernel_lb_addr *fileset)
+{
+	struct buffer_head *bh = NULL;
+	struct udf_vds_record vds[VDS_POS_LENGTH];
+	struct udf_vds_record *curr;
+	struct generic_desc *gd;
+	struct volDescPtr *vdp;
+	bool done = false;
+	uint32_t vdsn;
+	uint16_t ident;
+	long next_s = 0, next_e = 0;
+	int ret;
+
+	memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
+
+	/*
+	 * Read the main descriptor sequence and find which descriptors
+	 * are in it.
+	 */
+	for (; (!done && block <= lastblock); block++) {
+
+		bh = udf_read_tagged(sb, block, block, &ident);
+		if (!bh) {
+			udf_err(sb,
+				"Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
+				(unsigned long long)block);
+			return -EAGAIN;
+		}
+
+		/* Process each descriptor (ISO 13346 3/8.3-8.4) */
+		gd = (struct generic_desc *)bh->b_data;
+		vdsn = le32_to_cpu(gd->volDescSeqNum);
+		switch (ident) {
+		case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
+			curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
+			if (vdsn >= curr->volDescSeqNum) {
+				curr->volDescSeqNum = vdsn;
+				curr->block = block;
+			}
+			break;
+		case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
+			curr = &vds[VDS_POS_VOL_DESC_PTR];
+			if (vdsn >= curr->volDescSeqNum) {
+				curr->volDescSeqNum = vdsn;
+				curr->block = block;
+
+				vdp = (struct volDescPtr *)bh->b_data;
+				next_s = le32_to_cpu(
+					vdp->nextVolDescSeqExt.extLocation);
+				next_e = le32_to_cpu(
+					vdp->nextVolDescSeqExt.extLength);
+				next_e = next_e >> sb->s_blocksize_bits;
+				next_e += next_s;
+			}
+			break;
+		case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
+			curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
+			if (vdsn >= curr->volDescSeqNum) {
+				curr->volDescSeqNum = vdsn;
+				curr->block = block;
+			}
+			break;
+		case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
+			curr = &vds[VDS_POS_PARTITION_DESC];
+			if (!curr->block)
+				curr->block = block;
+			break;
+		case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
+			curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
+			if (vdsn >= curr->volDescSeqNum) {
+				curr->volDescSeqNum = vdsn;
+				curr->block = block;
+			}
+			break;
+		case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
+			curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
+			if (vdsn >= curr->volDescSeqNum) {
+				curr->volDescSeqNum = vdsn;
+				curr->block = block;
+			}
+			break;
+		case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
+			vds[VDS_POS_TERMINATING_DESC].block = block;
+			if (next_e) {
+				block = next_s;
+				lastblock = next_e;
+				next_s = next_e = 0;
+			} else
+				done = true;
+			break;
+		}
+		brelse(bh);
+	}
+	/*
+	 * Now read interesting descriptors again and process them
+	 * in a suitable order
+	 */
+	if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
+		udf_err(sb, "Primary Volume Descriptor not found!\n");
+		return -EAGAIN;
+	}
+	ret = udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block);
+	if (ret < 0)
+		return ret;
+
+	if (vds[VDS_POS_LOGICAL_VOL_DESC].block) {
+		ret = udf_load_logicalvol(sb,
+					  vds[VDS_POS_LOGICAL_VOL_DESC].block,
+					  fileset);
+		if (ret < 0)
+			return ret;
+	}
+
+	if (vds[VDS_POS_PARTITION_DESC].block) {
+		/*
+		 * We rescan the whole descriptor sequence to find
+		 * partition descriptor blocks and process them.
+		 */
+		for (block = vds[VDS_POS_PARTITION_DESC].block;
+		     block < vds[VDS_POS_TERMINATING_DESC].block;
+		     block++) {
+			ret = udf_load_partdesc(sb, block);
+			if (ret < 0)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Load Volume Descriptor Sequence described by anchor in bh
+ *
+ * Returns <0 on error, 0 on success
+ */
+static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
+			     struct kernel_lb_addr *fileset)
+{
+	struct anchorVolDescPtr *anchor;
+	sector_t main_s, main_e, reserve_s, reserve_e;
+	int ret;
+
+	anchor = (struct anchorVolDescPtr *)bh->b_data;
+
+	/* Locate the main sequence */
+	main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
+	main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
+	main_e = main_e >> sb->s_blocksize_bits;
+	main_e += main_s;
+
+	/* Locate the reserve sequence */
+	reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
+	reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
+	reserve_e = reserve_e >> sb->s_blocksize_bits;
+	reserve_e += reserve_s;
+
+	/* Process the main & reserve sequences */
+	/* responsible for finding the PartitionDesc(s) */
+	ret = udf_process_sequence(sb, main_s, main_e, fileset);
+	if (ret != -EAGAIN)
+		return ret;
+	udf_sb_free_partitions(sb);
+	ret = udf_process_sequence(sb, reserve_s, reserve_e, fileset);
+	if (ret < 0) {
+		udf_sb_free_partitions(sb);
+		/* No sequence was OK, return -EIO */
+		if (ret == -EAGAIN)
+			ret = -EIO;
+	}
+	return ret;
+}
+
+/*
+ * Check whether there is an anchor block in the given block and
+ * load Volume Descriptor Sequence if so.
+ *
+ * Returns <0 on error, 0 on success, -EAGAIN is special - try next anchor
+ * block
+ */
+static int udf_check_anchor_block(struct super_block *sb, sector_t block,
+				  struct kernel_lb_addr *fileset)
+{
+	struct buffer_head *bh;
+	uint16_t ident;
+	int ret;
+
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
+	    udf_fixed_to_variable(block) >=
+	    sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
+		return -EAGAIN;
+
+	bh = udf_read_tagged(sb, block, block, &ident);
+	if (!bh)
+		return -EAGAIN;
+	if (ident != TAG_IDENT_AVDP) {
+		brelse(bh);
+		return -EAGAIN;
+	}
+	ret = udf_load_sequence(sb, bh, fileset);
+	brelse(bh);
+	return ret;
+}
+
+/*
+ * Search for an anchor volume descriptor pointer.
+ *
+ * Returns < 0 on error, 0 on success. -EAGAIN is special - try next set
+ * of anchors.
+ */
+static int udf_scan_anchors(struct super_block *sb, sector_t *lastblock,
+			    struct kernel_lb_addr *fileset)
+{
+	sector_t last[6];
+	int i;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	int last_count = 0;
+	int ret;
+
+	/* First try user provided anchor */
+	if (sbi->s_anchor) {
+		ret = udf_check_anchor_block(sb, sbi->s_anchor, fileset);
+		if (ret != -EAGAIN)
+			return ret;
+	}
+	/*
+	 * according to spec, anchor is in either:
+	 *     block 256
+	 *     lastblock-256
+	 *     lastblock
+	 *  however, if the disc isn't closed, it could be 512.
+	 */
+	ret = udf_check_anchor_block(sb, sbi->s_session + 256, fileset);
+	if (ret != -EAGAIN)
+		return ret;
+	/*
+	 * The trouble is which block is the last one. Drives often misreport
+	 * this so we try various possibilities.
+	 */
+	last[last_count++] = *lastblock;
+	if (*lastblock >= 1)
+		last[last_count++] = *lastblock - 1;
+	last[last_count++] = *lastblock + 1;
+	if (*lastblock >= 2)
+		last[last_count++] = *lastblock - 2;
+	if (*lastblock >= 150)
+		last[last_count++] = *lastblock - 150;
+	if (*lastblock >= 152)
+		last[last_count++] = *lastblock - 152;
+
+	for (i = 0; i < last_count; i++) {
+		if (last[i] >= sb->s_bdev->bd_inode->i_size >>
+				sb->s_blocksize_bits)
+			continue;
+		ret = udf_check_anchor_block(sb, last[i], fileset);
+		if (ret != -EAGAIN) {
+			if (!ret)
+				*lastblock = last[i];
+			return ret;
+		}
+		if (last[i] < 256)
+			continue;
+		ret = udf_check_anchor_block(sb, last[i] - 256, fileset);
+		if (ret != -EAGAIN) {
+			if (!ret)
+				*lastblock = last[i];
+			return ret;
+		}
+	}
+
+	/* Finally try block 512 in case media is open */
+	return udf_check_anchor_block(sb, sbi->s_session + 512, fileset);
+}
+
+/*
+ * Find an anchor volume descriptor and load Volume Descriptor Sequence from
+ * area specified by it. The function expects sbi->s_lastblock to be the last
+ * block on the media.
+ *
+ * Return <0 on error, 0 if anchor found. -EAGAIN is special meaning anchor
+ * was not found.
+ */
+static int udf_find_anchor(struct super_block *sb,
+			   struct kernel_lb_addr *fileset)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	sector_t lastblock = sbi->s_last_block;
+	int ret;
+
+	ret = udf_scan_anchors(sb, &lastblock, fileset);
+	if (ret != -EAGAIN)
+		goto out;
+
+	/* No anchor found? Try VARCONV conversion of block numbers */
+	UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
+	lastblock = udf_variable_to_fixed(sbi->s_last_block);
+	/* Firstly, we try to not convert number of the last block */
+	ret = udf_scan_anchors(sb, &lastblock, fileset);
+	if (ret != -EAGAIN)
+		goto out;
+
+	lastblock = sbi->s_last_block;
+	/* Secondly, we try with converted number of the last block */
+	ret = udf_scan_anchors(sb, &lastblock, fileset);
+	if (ret < 0) {
+		/* VARCONV didn't help. Clear it. */
+		UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
+	}
+out:
+	if (ret == 0)
+		sbi->s_last_block = lastblock;
+	return ret;
+}
+
+/*
+ * Check Volume Structure Descriptor, find Anchor block and load Volume
+ * Descriptor Sequence.
+ *
+ * Returns < 0 on error, 0 on success. -EAGAIN is special meaning anchor
+ * block was not found.
+ */
+static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
+			int silent, struct kernel_lb_addr *fileset)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	loff_t nsr_off;
+	int ret;
+
+	if (!sb_set_blocksize(sb, uopt->blocksize)) {
+		if (!silent)
+			udf_warn(sb, "Bad block size\n");
+		return -EINVAL;
+	}
+	sbi->s_last_block = uopt->lastblock;
+	if (!uopt->novrs) {
+		/* Check that it is NSR02 compliant */
+		nsr_off = udf_check_vsd(sb);
+		if (!nsr_off) {
+			if (!silent)
+				udf_warn(sb, "No VRS found\n");
+			return 0;
+		}
+		if (nsr_off == -1)
+			udf_debug("Failed to read sector at offset %d. "
+				  "Assuming open disc. Skipping validity "
+				  "check\n", VSD_FIRST_SECTOR_OFFSET);
+		if (!sbi->s_last_block)
+			sbi->s_last_block = udf_get_last_block(sb);
+	} else {
+		udf_debug("Validity check skipped because of novrs option\n");
+	}
+
+	/* Look for anchor block and load Volume Descriptor Sequence */
+	sbi->s_anchor = uopt->anchor;
+	ret = udf_find_anchor(sb, fileset);
+	if (ret < 0) {
+		if (!silent && ret == -EAGAIN)
+			udf_warn(sb, "No anchor found\n");
+		return ret;
+	}
+	return 0;
+}
+
+static void udf_open_lvid(struct super_block *sb)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct buffer_head *bh = sbi->s_lvid_bh;
+	struct logicalVolIntegrityDesc *lvid;
+	struct logicalVolIntegrityDescImpUse *lvidiu;
+
+	if (!bh)
+		return;
+	lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+	lvidiu = udf_sb_lvidiu(sb);
+	if (!lvidiu)
+		return;
+
+	mutex_lock(&sbi->s_alloc_mutex);
+	lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+	lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+	udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
+				CURRENT_TIME);
+	lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
+
+	lvid->descTag.descCRC = cpu_to_le16(
+		crc_itu_t(0, (char *)lvid + sizeof(struct tag),
+			le16_to_cpu(lvid->descTag.descCRCLength)));
+
+	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
+	mark_buffer_dirty(bh);
+	sbi->s_lvid_dirty = 0;
+	mutex_unlock(&sbi->s_alloc_mutex);
+	/* Make opening of filesystem visible on the media immediately */
+	sync_dirty_buffer(bh);
+}
+
+static void udf_close_lvid(struct super_block *sb)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct buffer_head *bh = sbi->s_lvid_bh;
+	struct logicalVolIntegrityDesc *lvid;
+	struct logicalVolIntegrityDescImpUse *lvidiu;
+
+	if (!bh)
+		return;
+	lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+	lvidiu = udf_sb_lvidiu(sb);
+	if (!lvidiu)
+		return;
+
+	mutex_lock(&sbi->s_alloc_mutex);
+	lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
+	lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
+	udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
+	if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
+		lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
+	if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
+		lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
+	if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
+		lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
+	lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
+
+	lvid->descTag.descCRC = cpu_to_le16(
+			crc_itu_t(0, (char *)lvid + sizeof(struct tag),
+				le16_to_cpu(lvid->descTag.descCRCLength)));
+
+	lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
+	/*
+	 * We set buffer uptodate unconditionally here to avoid spurious
+	 * warnings from mark_buffer_dirty() when previous EIO has marked
+	 * the buffer as !uptodate
+	 */
+	set_buffer_uptodate(bh);
+	mark_buffer_dirty(bh);
+	sbi->s_lvid_dirty = 0;
+	mutex_unlock(&sbi->s_alloc_mutex);
+	/* Make closing of filesystem visible on the media immediately */
+	sync_dirty_buffer(bh);
+}
+
+u64 lvid_get_unique_id(struct super_block *sb)
+{
+	struct buffer_head *bh;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct logicalVolIntegrityDesc *lvid;
+	struct logicalVolHeaderDesc *lvhd;
+	u64 uniqueID;
+	u64 ret;
+
+	bh = sbi->s_lvid_bh;
+	if (!bh)
+		return 0;
+
+	lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
+	lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
+
+	mutex_lock(&sbi->s_alloc_mutex);
+	ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
+	if (!(++uniqueID & 0xFFFFFFFF))
+		uniqueID += 16;
+	lvhd->uniqueID = cpu_to_le64(uniqueID);
+	mutex_unlock(&sbi->s_alloc_mutex);
+	mark_buffer_dirty(bh);
+
+	return ret;
+}
+
+static int udf_fill_super(struct super_block *sb, void *options, int silent)
+{
+	int ret = -EINVAL;
+	struct inode *inode = NULL;
+	struct udf_options uopt;
+	struct kernel_lb_addr rootdir, fileset;
+	struct udf_sb_info *sbi;
+
+	uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
+	uopt.uid = INVALID_UID;
+	uopt.gid = INVALID_GID;
+	uopt.umask = 0;
+	uopt.fmode = UDF_INVALID_MODE;
+	uopt.dmode = UDF_INVALID_MODE;
+
+	sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
+	if (!sbi)
+		return -ENOMEM;
+
+	sb->s_fs_info = sbi;
+
+	mutex_init(&sbi->s_alloc_mutex);
+
+	if (!udf_parse_options((char *)options, &uopt, false))
+		goto parse_options_failure;
+
+	if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
+	    uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
+		udf_err(sb, "utf8 cannot be combined with iocharset\n");
+		goto parse_options_failure;
+	}
+#ifdef CONFIG_UDF_NLS
+	if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
+		uopt.nls_map = load_nls_default();
+		if (!uopt.nls_map)
+			uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
+		else
+			udf_debug("Using default NLS map\n");
+	}
+#endif
+	if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
+		uopt.flags |= (1 << UDF_FLAG_UTF8);
+
+	fileset.logicalBlockNum = 0xFFFFFFFF;
+	fileset.partitionReferenceNum = 0xFFFF;
+
+	sbi->s_flags = uopt.flags;
+	sbi->s_uid = uopt.uid;
+	sbi->s_gid = uopt.gid;
+	sbi->s_umask = uopt.umask;
+	sbi->s_fmode = uopt.fmode;
+	sbi->s_dmode = uopt.dmode;
+	sbi->s_nls_map = uopt.nls_map;
+	rwlock_init(&sbi->s_cred_lock);
+
+	if (uopt.session == 0xFFFFFFFF)
+		sbi->s_session = udf_get_last_session(sb);
+	else
+		sbi->s_session = uopt.session;
+
+	udf_debug("Multi-session=%d\n", sbi->s_session);
+
+	/* Fill in the rest of the superblock */
+	sb->s_op = &udf_sb_ops;
+	sb->s_export_op = &udf_export_ops;
+
+	sb->s_magic = UDF_SUPER_MAGIC;
+	sb->s_time_gran = 1000;
+
+	if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
+		ret = udf_load_vrs(sb, &uopt, silent, &fileset);
+	} else {
+		uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
+		ret = udf_load_vrs(sb, &uopt, silent, &fileset);
+		if (ret == -EAGAIN && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
+			if (!silent)
+				pr_notice("Rescanning with blocksize %d\n",
+					  UDF_DEFAULT_BLOCKSIZE);
+			brelse(sbi->s_lvid_bh);
+			sbi->s_lvid_bh = NULL;
+			uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
+			ret = udf_load_vrs(sb, &uopt, silent, &fileset);
+		}
+	}
+	if (ret < 0) {
+		if (ret == -EAGAIN) {
+			udf_warn(sb, "No partition found (1)\n");
+			ret = -EINVAL;
+		}
+		goto error_out;
+	}
+
+	udf_debug("Lastblock=%d\n", sbi->s_last_block);
+
+	if (sbi->s_lvid_bh) {
+		struct logicalVolIntegrityDescImpUse *lvidiu =
+							udf_sb_lvidiu(sb);
+		uint16_t minUDFReadRev;
+		uint16_t minUDFWriteRev;
+
+		if (!lvidiu) {
+			ret = -EINVAL;
+			goto error_out;
+		}
+		minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
+		minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
+		if (minUDFReadRev > UDF_MAX_READ_VERSION) {
+			udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
+				minUDFReadRev,
+				UDF_MAX_READ_VERSION);
+			ret = -EINVAL;
+			goto error_out;
+		} else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION &&
+			   !(sb->s_flags & MS_RDONLY)) {
+			ret = -EACCES;
+			goto error_out;
+		}
+
+		sbi->s_udfrev = minUDFWriteRev;
+
+		if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
+			UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
+		if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
+			UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
+	}
+
+	if (!sbi->s_partitions) {
+		udf_warn(sb, "No partition found (2)\n");
+		ret = -EINVAL;
+		goto error_out;
+	}
+
+	if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
+			UDF_PART_FLAG_READ_ONLY &&
+	    !(sb->s_flags & MS_RDONLY)) {
+		ret = -EACCES;
+		goto error_out;
+	}
+
+	if (udf_find_fileset(sb, &fileset, &rootdir)) {
+		udf_warn(sb, "No fileset found\n");
+		ret = -EINVAL;
+		goto error_out;
+	}
+
+	if (!silent) {
+		struct timestamp ts;
+		udf_time_to_disk_stamp(&ts, sbi->s_record_time);
+		udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
+			 sbi->s_volume_ident,
+			 le16_to_cpu(ts.year), ts.month, ts.day,
+			 ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
+	}
+	if (!(sb->s_flags & MS_RDONLY))
+		udf_open_lvid(sb);
+
+	/* Assign the root inode */
+	/* assign inodes by physical block number */
+	/* perhaps it's not extensible enough, but for now ... */
+	inode = udf_iget(sb, &rootdir);
+	if (IS_ERR(inode)) {
+		udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
+		       rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
+		ret = PTR_ERR(inode);
+		goto error_out;
+	}
+
+	/* Allocate a dentry for the root inode */
+	sb->s_root = d_make_root(inode);
+	if (!sb->s_root) {
+		udf_err(sb, "Couldn't allocate root dentry\n");
+		ret = -ENOMEM;
+		goto error_out;
+	}
+	sb->s_maxbytes = MAX_LFS_FILESIZE;
+	sb->s_max_links = UDF_MAX_LINKS;
+	return 0;
+
+error_out:
+	iput(sbi->s_vat_inode);
+parse_options_failure:
+#ifdef CONFIG_UDF_NLS
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+		unload_nls(sbi->s_nls_map);
+#endif
+	if (!(sb->s_flags & MS_RDONLY))
+		udf_close_lvid(sb);
+	brelse(sbi->s_lvid_bh);
+	udf_sb_free_partitions(sb);
+	kfree(sbi);
+	sb->s_fs_info = NULL;
+
+	return ret;
+}
+
+void _udf_err(struct super_block *sb, const char *function,
+	      const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
+
+	va_end(args);
+}
+
+void _udf_warn(struct super_block *sb, const char *function,
+	       const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
+
+	va_end(args);
+}
+
+static void udf_put_super(struct super_block *sb)
+{
+	struct udf_sb_info *sbi;
+
+	sbi = UDF_SB(sb);
+
+	iput(sbi->s_vat_inode);
+#ifdef CONFIG_UDF_NLS
+	if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
+		unload_nls(sbi->s_nls_map);
+#endif
+	if (!(sb->s_flags & MS_RDONLY))
+		udf_close_lvid(sb);
+	brelse(sbi->s_lvid_bh);
+	udf_sb_free_partitions(sb);
+	mutex_destroy(&sbi->s_alloc_mutex);
+	kfree(sb->s_fs_info);
+	sb->s_fs_info = NULL;
+}
+
+static int udf_sync_fs(struct super_block *sb, int wait)
+{
+	struct udf_sb_info *sbi = UDF_SB(sb);
+
+	mutex_lock(&sbi->s_alloc_mutex);
+	if (sbi->s_lvid_dirty) {
+		/*
+		 * Blockdevice will be synced later so we don't have to submit
+		 * the buffer for IO
+		 */
+		mark_buffer_dirty(sbi->s_lvid_bh);
+		sbi->s_lvid_dirty = 0;
+	}
+	mutex_unlock(&sbi->s_alloc_mutex);
+
+	return 0;
+}
+
+static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct super_block *sb = dentry->d_sb;
+	struct udf_sb_info *sbi = UDF_SB(sb);
+	struct logicalVolIntegrityDescImpUse *lvidiu;
+	u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+	lvidiu = udf_sb_lvidiu(sb);
+	buf->f_type = UDF_SUPER_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
+	buf->f_bfree = udf_count_free(sb);
+	buf->f_bavail = buf->f_bfree;
+	buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
+					  le32_to_cpu(lvidiu->numDirs)) : 0)
+			+ buf->f_bfree;
+	buf->f_ffree = buf->f_bfree;
+	buf->f_namelen = UDF_NAME_LEN - 2;
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+
+	return 0;
+}
+
+static unsigned int udf_count_free_bitmap(struct super_block *sb,
+					  struct udf_bitmap *bitmap)
+{
+	struct buffer_head *bh = NULL;
+	unsigned int accum = 0;
+	int index;
+	int block = 0, newblock;
+	struct kernel_lb_addr loc;
+	uint32_t bytes;
+	uint8_t *ptr;
+	uint16_t ident;
+	struct spaceBitmapDesc *bm;
+
+	loc.logicalBlockNum = bitmap->s_extPosition;
+	loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
+	bh = udf_read_ptagged(sb, &loc, 0, &ident);
+
+	if (!bh) {
+		udf_err(sb, "udf_count_free failed\n");
+		goto out;
+	} else if (ident != TAG_IDENT_SBD) {
+		brelse(bh);
+		udf_err(sb, "udf_count_free failed\n");
+		goto out;
+	}
+
+	bm = (struct spaceBitmapDesc *)bh->b_data;
+	bytes = le32_to_cpu(bm->numOfBytes);
+	index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
+	ptr = (uint8_t *)bh->b_data;
+
+	while (bytes > 0) {
+		u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
+		accum += bitmap_weight((const unsigned long *)(ptr + index),
+					cur_bytes * 8);
+		bytes -= cur_bytes;
+		if (bytes) {
+			brelse(bh);
+			newblock = udf_get_lb_pblock(sb, &loc, ++block);
+			bh = udf_tread(sb, newblock);
+			if (!bh) {
+				udf_debug("read failed\n");
+				goto out;
+			}
+			index = 0;
+			ptr = (uint8_t *)bh->b_data;
+		}
+	}
+	brelse(bh);
+out:
+	return accum;
+}
+
+static unsigned int udf_count_free_table(struct super_block *sb,
+					 struct inode *table)
+{
+	unsigned int accum = 0;
+	uint32_t elen;
+	struct kernel_lb_addr eloc;
+	int8_t etype;
+	struct extent_position epos;
+
+	mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
+	epos.block = UDF_I(table)->i_location;
+	epos.offset = sizeof(struct unallocSpaceEntry);
+	epos.bh = NULL;
+
+	while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
+		accum += (elen >> table->i_sb->s_blocksize_bits);
+
+	brelse(epos.bh);
+	mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
+
+	return accum;
+}
+
+static unsigned int udf_count_free(struct super_block *sb)
+{
+	unsigned int accum = 0;
+	struct udf_sb_info *sbi;
+	struct udf_part_map *map;
+
+	sbi = UDF_SB(sb);
+	if (sbi->s_lvid_bh) {
+		struct logicalVolIntegrityDesc *lvid =
+			(struct logicalVolIntegrityDesc *)
+			sbi->s_lvid_bh->b_data;
+		if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
+			accum = le32_to_cpu(
+					lvid->freeSpaceTable[sbi->s_partition]);
+			if (accum == 0xFFFFFFFF)
+				accum = 0;
+		}
+	}
+
+	if (accum)
+		return accum;
+
+	map = &sbi->s_partmaps[sbi->s_partition];
+	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
+		accum += udf_count_free_bitmap(sb,
+					       map->s_uspace.s_bitmap);
+	}
+	if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
+		accum += udf_count_free_bitmap(sb,
+					       map->s_fspace.s_bitmap);
+	}
+	if (accum)
+		return accum;
+
+	if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
+		accum += udf_count_free_table(sb,
+					      map->s_uspace.s_table);
+	}
+	if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
+		accum += udf_count_free_table(sb,
+					      map->s_fspace.s_table);
+	}
+
+	return accum;
+}