--- a/file.c
+++ b/file.c
@@ -69,7 +69,7 @@
 /*
  * ntfs_getattr - inode_operations::getattr
  */
-int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+int ntfs_getattr(const struct path *path,
 		 struct kstat *stat, u32 request_mask, u32 flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -83,7 +83,7 @@
 
 	stat->attributes_mask |= STATX_ATTR_COMPRESSED | STATX_ATTR_ENCRYPTED;
 
-	generic_fillattr(mnt_userns, inode, stat);
+	generic_fillattr(inode, stat);
 
 	stat->result_mask |= STATX_BTIME;
 	stat->btime = ni->i_crtime;
@@ -734,7 +734,7 @@
 /*
  * ntfs3_setattr - inode_operations::setattr
  */
-int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+int ntfs3_setattr(struct dentry *dentry,
 		  struct iattr *attr)
 {
 	struct super_block *sb = dentry->d_sb;
@@ -753,7 +753,7 @@
 		ia_valid = attr->ia_valid;
 	}
 
-	err = setattr_prepare(mnt_userns, dentry, attr);
+	err = setattr_prepare(dentry, attr);
 	if (err)
 		goto out;
 
@@ -778,10 +778,10 @@
 		ni->ni_flags |= NI_FLAG_UPDATE_PARENT;
 	}
 
-	setattr_copy(mnt_userns, inode, attr);
+	setattr_copy(inode, attr);
 
 	if (mode != inode->i_mode) {
-		err = ntfs_acl_chmod(mnt_userns, inode);
+		err = ntfs_acl_chmod(inode);
 		if (err)
 			goto out;
 

--- a/fsntfs.c
+++ b/fsntfs.c
@@ -1599,7 +1599,7 @@
 		lbo = (u64)lcn << cluster_bits;
 		len = (u64)clen << cluster_bits;
 new_bio:
-		new = ntfs_alloc_bio(BIO_MAX_VECS);
+		new = ntfs_alloc_bio(BIO_MAX_PAGES);
 		if (!new) {
 			err = -ENOMEM;
 			break;

--- a/inode.c
+++ b/inode.c
@@ -1167,7 +1167,7 @@
 	return ERR_PTR(err);
 }
 
-struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
+struct inode *ntfs_create_inode(
 				struct inode *dir, struct dentry *dentry,
 				const struct cpu_str *uni, umode_t mode,
 				dev_t dev, const char *symname, u32 size,
@@ -1284,7 +1284,7 @@
 		goto out3;
 	}
 	inode = &ni->vfs_inode;
-	inode_init_owner(mnt_userns, inode, dir, mode);
+	inode_init_owner(inode, dir, mode);
 	mode = inode->i_mode;
 
 	inode->i_atime = inode->i_mtime = inode->i_ctime = ni->i_crtime =
@@ -1583,7 +1583,7 @@
 
 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
 	if (!S_ISLNK(mode) && (sb->s_flags & SB_POSIXACL)) {
-		err = ntfs_init_acl(mnt_userns, inode, dir);
+		err = ntfs_init_acl(inode, dir);
 		if (err)
 			goto out7;
 	} else

--- a/namei.c
+++ b/namei.c
@@ -92,12 +92,12 @@
 /*
  * ntfs_create - inode_operations::create
  */
-static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir,
+static int ntfs_create(struct inode *dir,
 		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
 
-	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode,
+	inode = ntfs_create_inode(dir, dentry, NULL, S_IFREG | mode,
 				  0, NULL, 0, NULL);
 
 	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
@@ -108,12 +108,12 @@
  *
  * inode_operations::mknod
  */
-static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+static int ntfs_mknod(struct inode *dir,
 		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct inode *inode;
 
-	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev,
+	inode = ntfs_create_inode(dir, dentry, NULL, mode, rdev,
 				  NULL, 0, NULL);
 
 	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
@@ -181,13 +181,13 @@
 /*
  * ntfs_symlink - inode_operations::symlink
  */
-static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+static int ntfs_symlink(struct inode *dir,
 			struct dentry *dentry, const char *symname)
 {
 	u32 size = strlen(symname);
 	struct inode *inode;
 
-	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777,
+	inode = ntfs_create_inode(dir, dentry, NULL, S_IFLNK | 0777,
 				  0, symname, size, NULL);
 
 	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
@@ -196,12 +196,12 @@
 /*
  * ntfs_mkdir- inode_operations::mkdir
  */
-static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+static int ntfs_mkdir(struct inode *dir,
 		      struct dentry *dentry, umode_t mode)
 {
 	struct inode *inode;
 
-	inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode,
+	inode = ntfs_create_inode(dir, dentry, NULL, S_IFDIR | mode,
 				  0, NULL, 0, NULL);
 
 	return IS_ERR(inode) ? PTR_ERR(inode) : 0;
@@ -227,7 +227,7 @@
 /*
  * ntfs_rename - inode_operations::rename
  */
-static int ntfs_rename(struct user_namespace *mnt_userns, struct inode *dir,
+static int ntfs_rename(struct inode *dir,
 		       struct dentry *dentry, struct inode *new_dir,
 		       struct dentry *new_dentry, u32 flags)
 {

--- a/ntfs_fs.h
+++ b/ntfs_fs.h
@@ -486,11 +486,11 @@
 extern const struct file_operations ntfs_dir_operations;
 
 /* Globals from file.c */
-int ntfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+int ntfs_getattr(const struct path *path,
 		 struct kstat *stat, u32 request_mask, u32 flags);
 void ntfs_sparse_cluster(struct inode *inode, struct page *page0, CLST vcn,
 			 CLST len);
-int ntfs3_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+int ntfs3_setattr(struct dentry *dentry,
 		  struct iattr *attr);
 int ntfs_file_open(struct inode *inode, struct file *file);
 int ntfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
@@ -695,7 +695,7 @@
 int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
 		      struct inode *i2);
 int inode_write_data(struct inode *inode, const void *data, size_t bytes);
-struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,
+struct inode *ntfs_create_inode(
 				struct inode *dir, struct dentry *dentry,
 				const struct cpu_str *uni, umode_t mode,
 				dev_t dev, const char *symname, u32 size,
@@ -837,17 +837,17 @@
 /* globals from xattr.c */
 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
 struct posix_acl *ntfs_get_acl(struct inode *inode, int type);
-int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_set_acl(struct inode *inode,
 		 struct posix_acl *acl, int type);
-int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_init_acl(struct inode *inode,
 		  struct inode *dir);
 #else
 #define ntfs_get_acl NULL
 #define ntfs_set_acl NULL
 #endif
 
-int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode);
-int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_acl_chmod(struct inode *inode);
+int ntfs_permission(struct inode *inode,
 		    int mask);
 ssize_t ntfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 extern const struct xattr_handler *ntfs_xattr_handlers[];

--- a/super.c
+++ b/super.c
@@ -514,9 +514,9 @@
 	struct user_namespace *user_ns = seq_user_ns(m);
 
 	seq_printf(m, ",uid=%u",
-		  from_kuid_munged(user_ns, opts->fs_uid));
+		  from_kuid_munged(&init_user_ns, opts->fs_uid));
 	seq_printf(m, ",gid=%u",
-		  from_kgid_munged(user_ns, opts->fs_gid));
+		  from_kgid_munged(&init_user_ns, opts->fs_gid));
 	if (opts->fmask)
 		seq_printf(m, ",fmask=%04o", ~opts->fs_fmask_inv);
 	if (opts->dmask)
@@ -1435,7 +1435,7 @@
 	.init_fs_context	= ntfs_init_fs_context,
 	.parameters		= ntfs_fs_parameters,
 	.kill_sb		= kill_block_super,
-	.fs_flags		= FS_REQUIRES_DEV | FS_ALLOW_IDMAP,
+	.fs_flags		= FS_REQUIRES_DEV,
 };
 // clang-format on
 

--- a/xattr.c
+++ b/xattr.c
@@ -478,7 +478,7 @@
 }
 
 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
-static struct posix_acl *ntfs_get_acl_ex(struct user_namespace *mnt_userns,
+static struct posix_acl *ntfs_get_acl_ex(
 					 struct inode *inode, int type,
 					 int locked)
 {
@@ -514,7 +514,7 @@
 
 	/* Translate extended attribute to acl. */
 	if (err >= 0) {
-		acl = posix_acl_from_xattr(mnt_userns, buf, err);
+		acl = posix_acl_from_xattr(&init_user_ns, buf, err);
 	} else if (err == -ENODATA) {
 		acl = NULL;
 	} else {
@@ -535,10 +535,10 @@
 struct posix_acl *ntfs_get_acl(struct inode *inode, int type)
 {
 	/* TODO: init_user_ns? */
-	return ntfs_get_acl_ex(&init_user_ns, inode, type, 0);
+	return ntfs_get_acl_ex(inode, type, 0);
 }
 
-static noinline int ntfs_set_acl_ex(struct user_namespace *mnt_userns,
+static noinline int ntfs_set_acl_ex(
 				    struct inode *inode, struct posix_acl *acl,
 				    int type, bool init_acl)
 {
@@ -557,7 +557,7 @@
 		if (acl && !init_acl) {
 			umode_t mode;
 
-			err = posix_acl_update_mode(mnt_userns, inode, &mode,
+			err = posix_acl_update_mode(inode, &mode,
 						    &acl);
 			if (err)
 				goto out;
@@ -592,7 +592,7 @@
 		value = kmalloc(size, GFP_NOFS);
 		if (!value)
 			return -ENOMEM;
-		err = posix_acl_to_xattr(mnt_userns, acl, value, size);
+		err = posix_acl_to_xattr(&init_user_ns, acl, value, size);
 		if (err < 0)
 			goto out;
 		flags = 0;
@@ -613,13 +613,13 @@
 /*
  * ntfs_set_acl - inode_operations::set_acl
  */
-int ntfs_set_acl(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_set_acl(struct inode *inode,
 		 struct posix_acl *acl, int type)
 {
-	return ntfs_set_acl_ex(mnt_userns, inode, acl, type, false);
+	return ntfs_set_acl_ex(inode, acl, type, false);
 }
 
-static int ntfs_xattr_get_acl(struct user_namespace *mnt_userns,
+static int ntfs_xattr_get_acl(
 			      struct inode *inode, int type, void *buffer,
 			      size_t size)
 {
@@ -638,7 +638,7 @@
 	if (!acl)
 		return -ENODATA;
 
-	err = posix_acl_to_xattr(mnt_userns, acl, buffer, size);
+	err = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
 	posix_acl_release(acl);
 
 	return err;
 }
 
-static int ntfs_xattr_set_acl(struct user_namespace *mnt_userns,
+static int ntfs_xattr_set_acl(
 			      struct inode *inode, int type, const void *value,
 			      size_t size)
 {
@@ -656,24 +656,24 @@
 		return -EOPNOTSUPP;
 	}
 
-	if (!inode_owner_or_capable(mnt_userns, inode))
+	if (!inode_owner_or_capable(inode))
 		return -EPERM;
 
 	if (!value) {
 		acl = NULL;
 	} else {
-		acl = posix_acl_from_xattr(mnt_userns, value, size);
+		acl = posix_acl_from_xattr(&init_user_ns, value, size);
 		if (IS_ERR(acl))
 			return PTR_ERR(acl);
 
 		if (acl) {
-			err = posix_acl_valid(mnt_userns, acl);
+			err = posix_acl_valid(&init_user_ns, acl);
 			if (err)
 				goto release_and_out;
 		}
 	}
 
-	err = ntfs_set_acl(mnt_userns, inode, acl, type);
+	err = ntfs_set_acl(inode, acl, type);
 
 release_and_out:
 	posix_acl_release(acl);
@@ -685,7 +685,7 @@
  *
  * Called from ntfs_create_inode().
  */
-int ntfs_init_acl(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_init_acl(struct inode *inode,
 		  struct inode *dir)
 {
 	struct posix_acl *default_acl, *acl;
@@ -696,7 +696,7 @@
 		return err;
 
 	if (default_acl) {
-		err = ntfs_set_acl_ex(mnt_userns, inode, default_acl,
+		err = ntfs_set_acl_ex(inode, default_acl,
 				      ACL_TYPE_DEFAULT, true);
 		posix_acl_release(default_acl);
 	} else {
@@ -707,7 +707,7 @@
 		inode->i_acl = NULL;
 	else {
 		if (!err)
-			err = ntfs_set_acl_ex(mnt_userns, inode, acl,
+			err = ntfs_set_acl_ex(inode, acl,
 					      ACL_TYPE_ACCESS, true);
 		posix_acl_release(acl);
 	}
@@ -719,7 +719,7 @@
 /*
  * ntfs_acl_chmod - Helper for ntfs3_setattr().
  */
-int ntfs_acl_chmod(struct user_namespace *mnt_userns, struct inode *inode)
+int ntfs_acl_chmod(struct inode *inode)
 {
 	struct super_block *sb = inode->i_sb;
 
@@ -729,13 +729,13 @@
 	if (S_ISLNK(inode->i_mode))
 		return -EOPNOTSUPP;
 
-	return posix_acl_chmod(mnt_userns, inode, inode->i_mode);
+	return posix_acl_chmod(inode, inode->i_mode);
 }
 
 /*
  * ntfs_permission - inode_operations::permission
  */
-int ntfs_permission(struct user_namespace *mnt_userns, struct inode *inode,
+int ntfs_permission(struct inode *inode,
 		    int mask)
 {
 	if (ntfs_sb(inode->i_sb)->options->noacsrules) {
@@ -743,7 +743,7 @@
 		return 0;
 	}
 
-	return generic_permission(mnt_userns, inode, mask);
+	return generic_permission(inode, mask);
 }
 
 /*
@@ -855,7 +855,7 @@
 		     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
 		/* TODO: init_user_ns? */
 		err = ntfs_xattr_get_acl(
-			&init_user_ns, inode,
+			inode,
 			name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
 				? ACL_TYPE_ACCESS
 				: ACL_TYPE_DEFAULT,
@@ -874,7 +874,7 @@
  * ntfs_setxattr - inode_operations::setxattr
  */
 static noinline int ntfs_setxattr(const struct xattr_handler *handler,
-				  struct user_namespace *mnt_userns,
+				  
 				  struct dentry *de, struct inode *inode,
 				  const char *name, const void *value,
 				  size_t size, int flags)
@@ -983,7 +983,7 @@
 	     !memcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
 		     sizeof(XATTR_NAME_POSIX_ACL_DEFAULT)))) {
 		err = ntfs_xattr_set_acl(
-			mnt_userns, inode,
+			inode,
 			name_len == sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1
 				? ACL_TYPE_ACCESS
 				: ACL_TYPE_DEFAULT,