cregit-Linux how code gets into the kernel

Release 4.10 fs/udf/super.c

Directory: fs/udf
/*
 * 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

/*
 * Maximum number of Terminating Descriptor / Logical Volume Integrity
 * Descriptor redirections. The chosen numbers are arbitrary - just that we
 * hopefully don't limit any real use of rewritten inode on write-once media
 * but avoid looping for too long on corrupted media.
 */

#define UDF_MAX_TD_NESTING 64

#define UDF_MAX_LVID_NESTING 1000


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]);
}


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/* 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);
}


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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;
}


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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));
}


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static void udf_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, udf_i_callback);
}


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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);
}


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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 |
						 SLAB_ACCOUNT),
					     init_once);
	if (!udf_inode_cachep)
		return -ENOMEM;
	return 0;
}


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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);
}


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/* 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;
}


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


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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;
}


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static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
	int i;
	int nr_groups = bitmap->s_nr_groups;

	for (i = 0; i < nr_groups; i++)
		if (bitmap->s_block_bitmap[i])
			brelse(bitmap->s_block_bitmap[i]);

	kvfree(bitmap);
}


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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;
	}
}


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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;
}


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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;
}


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/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
pre-gitpre-git29236.55%211.76%


andrew mortonandrew morton22127.66%15.88%


phillip susiphillip susi567.01%15.88%


marcin slusarzmarcin slusarz506.26%15.88%


linus torvaldslinus torvalds445.51%423.53%


eric w. biedermaneric w. biederman384.76%15.88%


miklos szeredimiklos szeredi334.13%15.88%


fabian frederickfabian frederick293.63%15.88%


cyrill gorcunovcyrill gorcunov202.50%15.88%


clemens ladischclemens ladisch111.38%211.76%


adrian bunkadrian bunk30.38%15.88%


joe perchesjoe perches20.25%15.88%


Total799100.00%17100.00%






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->