diff --git a/fs/attr.c b/fs/attr.c
index bd8d542e13b9..2cadd055dbf2 100644
--- a/fs/attr.c
+++ b/fs/attr.c
@@ -23,7 +23,7 @@
 /**
  * setattr_should_drop_sgid - determine whether the setgid bit needs to be
  *                            removed
- * @mnt_userns:	user namespace of the mount @inode was found from
+ * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check
  *
  * This function determines whether the setgid bit needs to be removed.
@@ -33,16 +33,17 @@
  *
  * Return: ATTR_KILL_SGID if setgid bit needs to be removed, 0 otherwise.
  */
-int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
+int setattr_should_drop_sgid(struct mnt_idmap *idmap,
 			     const struct inode *inode)
 {
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	umode_t mode = inode->i_mode;
 
 	if (!(mode & S_ISGID))
 		return 0;
 	if (mode & S_IXGRP)
 		return ATTR_KILL_SGID;
-	if (!in_group_or_capable(mnt_userns, inode,
+	if (!in_group_or_capable(idmap, inode,
 				 i_gid_into_vfsgid(mnt_userns, inode)))
 		return ATTR_KILL_SGID;
 	return 0;
@@ -51,7 +52,7 @@ int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
 /**
  * setattr_should_drop_suidgid - determine whether the set{g,u}id bit needs to
  *                               be dropped
- * @mnt_userns:	user namespace of the mount @inode was found from
+ * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check
  *
  * This function determines whether the set{g,u}id bits need to be removed.
@@ -63,7 +64,7 @@ int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
  * Return: A mask of ATTR_KILL_S{G,U}ID indicating which - if any - setid bits
  * to remove, 0 otherwise.
  */
-int setattr_should_drop_suidgid(struct user_namespace *mnt_userns,
+int setattr_should_drop_suidgid(struct mnt_idmap *idmap,
 				struct inode *inode)
 {
 	umode_t mode = inode->i_mode;
@@ -73,7 +74,7 @@ int setattr_should_drop_suidgid(struct user_namespace *mnt_userns,
 	if (unlikely(mode & S_ISUID))
 		kill = ATTR_KILL_SUID;
 
-	kill |= setattr_should_drop_sgid(mnt_userns, inode);
+	kill |= setattr_should_drop_sgid(idmap, inode);
 
 	if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
 		return kill;
@@ -84,24 +85,26 @@ EXPORT_SYMBOL(setattr_should_drop_suidgid);
 
 /**
  * chown_ok - verify permissions to chown inode
- * @mnt_userns:	user namespace of the mount @inode was found from
+ * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check permissions on
  * @ia_vfsuid:	uid to chown @inode to
  *
- * If the inode has been found through an idmapped mount the user namespace of
- * the vfsmount must be passed through @mnt_userns. This function will then
- * take care to map the inode according to @mnt_userns before checking
+ * If the inode has been found through an idmapped mount the idmap of
+ * the vfsmount must be passed through @idmap. This function will then
+ * take care to map the inode according to @idmap before checking
  * permissions. On non-idmapped mounts or if permission checking is to be
- * performed on the raw inode simply passs init_user_ns.
+ * performed on the raw inode simply pass @nop_mnt_idmap.
  */
-static bool chown_ok(struct user_namespace *mnt_userns,
+static bool chown_ok(struct mnt_idmap *idmap,
 		     const struct inode *inode, vfsuid_t ia_vfsuid)
 {
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
+
 	vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
 	if (vfsuid_eq_kuid(vfsuid, current_fsuid()) &&
 	    vfsuid_eq(ia_vfsuid, vfsuid))
 		return true;
-	if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN))
+	if (capable_wrt_inode_uidgid(idmap, inode, CAP_CHOWN))
 		return true;
 	if (!vfsuid_valid(vfsuid) &&
 	    ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
@@ -111,19 +114,21 @@ static bool chown_ok(struct user_namespace *mnt_userns,
 
 /**
  * chgrp_ok - verify permissions to chgrp inode
- * @mnt_userns:	user namespace of the mount @inode was found from
+ * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check permissions on
  * @ia_vfsgid:	gid to chown @inode to
  *
- * If the inode has been found through an idmapped mount the user namespace of
- * the vfsmount must be passed through @mnt_userns. This function will then
- * take care to map the inode according to @mnt_userns before checking
+ * If the inode has been found through an idmapped mount the idmap of
+ * the vfsmount must be passed through @idmap. This function will then
+ * take care to map the inode according to @idmap before checking
  * permissions. On non-idmapped mounts or if permission checking is to be
- * performed on the raw inode simply passs init_user_ns.
+ * performed on the raw inode simply pass @nop_mnt_idmap.
  */
-static bool chgrp_ok(struct user_namespace *mnt_userns,
+static bool chgrp_ok(struct mnt_idmap *idmap,
 		     const struct inode *inode, vfsgid_t ia_vfsgid)
 {
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
+
 	vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
 	vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
 	if (vfsuid_eq_kuid(vfsuid, current_fsuid())) {
@@ -132,7 +137,7 @@ static bool chgrp_ok(struct user_namespace *mnt_userns,
 		if (vfsgid_in_group_p(ia_vfsgid))
 			return true;
 	}
-	if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN))
+	if (capable_wrt_inode_uidgid(idmap, inode, CAP_CHOWN))
 		return true;
 	if (!vfsgid_valid(vfsgid) &&
 	    ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN))
@@ -184,12 +189,12 @@ int setattr_prepare(struct mnt_idmap *idmap, struct dentry *dentry,
 
 	/* Make sure a caller can chown. */
 	if ((ia_valid & ATTR_UID) &&
-	    !chown_ok(mnt_userns, inode, attr->ia_vfsuid))
+	    !chown_ok(idmap, inode, attr->ia_vfsuid))
 		return -EPERM;
 
 	/* Make sure caller can chgrp. */
 	if ((ia_valid & ATTR_GID) &&
-	    !chgrp_ok(mnt_userns, inode, attr->ia_vfsgid))
+	    !chgrp_ok(idmap, inode, attr->ia_vfsgid))
 		return -EPERM;
 
 	/* Make sure a caller can chmod. */
@@ -205,7 +210,7 @@ int setattr_prepare(struct mnt_idmap *idmap, struct dentry *dentry,
 			vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
 
 		/* Also check the setgid bit! */
-		if (!in_group_or_capable(mnt_userns, inode, vfsgid))
+		if (!in_group_or_capable(idmap, inode, vfsgid))
 			attr->ia_mode &= ~S_ISGID;
 	}
 
@@ -316,7 +321,7 @@ void setattr_copy(struct mnt_idmap *idmap, struct inode *inode,
 		inode->i_ctime = attr->ia_ctime;
 	if (ia_valid & ATTR_MODE) {
 		umode_t mode = attr->ia_mode;
-		if (!in_group_or_capable(mnt_userns, inode,
+		if (!in_group_or_capable(idmap, inode,
 					 i_gid_into_vfsgid(mnt_userns, inode)))
 			mode &= ~S_ISGID;
 		inode->i_mode = mode;
diff --git a/fs/exec.c b/fs/exec.c
index a1db1a27c62a..94979ddf3fd5 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1420,7 +1420,6 @@ void would_dump(struct linux_binprm *bprm, struct file *file)
 {
 	struct inode *inode = file_inode(file);
 	struct mnt_idmap *idmap = file_mnt_idmap(file);
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	if (inode_permission(idmap, inode, MAY_READ) < 0) {
 		struct user_namespace *old, *user_ns;
 		bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
@@ -1428,7 +1427,7 @@ void would_dump(struct linux_binprm *bprm, struct file *file)
 		/* Ensure mm->user_ns contains the executable */
 		user_ns = old = bprm->mm->user_ns;
 		while ((user_ns != &init_user_ns) &&
-		       !privileged_wrt_inode_uidgid(user_ns, mnt_userns, inode))
+		       !privileged_wrt_inode_uidgid(user_ns, idmap, inode))
 			user_ns = user_ns->parent;
 
 		if (old != user_ns) {
diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 6ced63bce4e4..dd5cea743036 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -204,11 +204,12 @@ struct posix_acl *f2fs_get_acl(struct inode *inode, int type, bool rcu)
 	return __f2fs_get_acl(inode, type, NULL);
 }
 
-static int f2fs_acl_update_mode(struct user_namespace *mnt_userns,
+static int f2fs_acl_update_mode(struct mnt_idmap *idmap,
 				struct inode *inode, umode_t *mode_p,
 				struct posix_acl **acl)
 {
 	umode_t mode = inode->i_mode;
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	int error;
 
 	if (is_inode_flag_set(inode, FI_ACL_MODE))
@@ -220,13 +221,13 @@ static int f2fs_acl_update_mode(struct user_namespace *mnt_userns,
 	if (error == 0)
 		*acl = NULL;
 	if (!vfsgid_in_group_p(i_gid_into_vfsgid(mnt_userns, inode)) &&
-	    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
+	    !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;
 }
 
-static int __f2fs_set_acl(struct user_namespace *mnt_userns,
+static int __f2fs_set_acl(struct mnt_idmap *idmap,
 			struct inode *inode, int type,
 			struct posix_acl *acl, struct page *ipage)
 {
@@ -240,7 +241,7 @@ static int __f2fs_set_acl(struct user_namespace *mnt_userns,
 	case ACL_TYPE_ACCESS:
 		name_index = F2FS_XATTR_INDEX_POSIX_ACL_ACCESS;
 		if (acl && !ipage) {
-			error = f2fs_acl_update_mode(mnt_userns, inode,
+			error = f2fs_acl_update_mode(idmap, inode,
 								&mode, &acl);
 			if (error)
 				return error;
@@ -279,13 +280,12 @@ static int __f2fs_set_acl(struct user_namespace *mnt_userns,
 int f2fs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	struct inode *inode = d_inode(dentry);
 
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
 		return -EIO;
 
-	return __f2fs_set_acl(mnt_userns, inode, type, acl, NULL);
+	return __f2fs_set_acl(idmap, inode, type, acl, NULL);
 }
 
 /*
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 80c3c65ad79c..c0cb207c7f6f 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -855,7 +855,7 @@ static void __setattr_copy(struct mnt_idmap *idmap,
 		vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
 
 		if (!vfsgid_in_group_p(vfsgid) &&
-		    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
+		    !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
 			mode &= ~S_ISGID;
 		set_acl_inode(inode, mode);
 	}
diff --git a/fs/fuse/acl.c b/fs/fuse/acl.c
index b63cfa2876e0..d56530ab0521 100644
--- a/fs/fuse/acl.c
+++ b/fs/fuse/acl.c
@@ -147,7 +147,7 @@ int fuse_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		 */
 		if (fc->posix_acl &&
 		    !vfsgid_in_group_p(i_gid_into_vfsgid(&init_user_ns, inode)) &&
-		    !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID))
+		    !capable_wrt_inode_uidgid(&nop_mnt_idmap, inode, CAP_FSETID))
 			extra_flags |= FUSE_SETXATTR_ACL_KILL_SGID;
 
 		ret = fuse_setxattr(inode, name, value, size, 0, extra_flags);
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index ff5a4793887a..99ec7d51b9d2 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1313,7 +1313,8 @@ static ssize_t fuse_cache_write_iter(struct kiocb *iocb, struct iov_iter *from)
 			return err;
 
 		if (fc->handle_killpriv_v2 &&
-		    setattr_should_drop_suidgid(&init_user_ns, file_inode(file))) {
+		    setattr_should_drop_suidgid(&nop_mnt_idmap,
+						file_inode(file))) {
 			goto writethrough;
 		}
 
diff --git a/fs/inode.c b/fs/inode.c
index cc1e47211328..43384cf1d41e 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1936,7 +1936,7 @@ EXPORT_SYMBOL(touch_atime);
  * response to write or truncate. Return 0 if nothing has to be changed.
  * Negative value on error (change should be denied).
  */
-int dentry_needs_remove_privs(struct user_namespace *mnt_userns,
+int dentry_needs_remove_privs(struct mnt_idmap *idmap,
 			      struct dentry *dentry)
 {
 	struct inode *inode = d_inode(dentry);
@@ -1946,7 +1946,7 @@ int dentry_needs_remove_privs(struct user_namespace *mnt_userns,
 	if (IS_NOSEC(inode))
 		return 0;
 
-	mask = setattr_should_drop_suidgid(mnt_userns, inode);
+	mask = setattr_should_drop_suidgid(idmap, inode);
 	ret = security_inode_need_killpriv(dentry);
 	if (ret < 0)
 		return ret;
@@ -1978,7 +1978,7 @@ static int __file_remove_privs(struct file *file, unsigned int flags)
 	if (IS_NOSEC(inode) || !S_ISREG(inode->i_mode))
 		return 0;
 
-	kill = dentry_needs_remove_privs(file_mnt_user_ns(file), dentry);
+	kill = dentry_needs_remove_privs(file_mnt_idmap(file), dentry);
 	if (kill < 0)
 		return kill;
 
@@ -2464,7 +2464,7 @@ EXPORT_SYMBOL(inode_set_ctime_current);
 
 /**
  * in_group_or_capable - check whether caller is CAP_FSETID privileged
- * @mnt_userns: user namespace of the mount @inode was found from
+ * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check
  * @vfsgid:	the new/current vfsgid of @inode
  *
@@ -2474,19 +2474,19 @@ EXPORT_SYMBOL(inode_set_ctime_current);
  *
  * Return: true if the caller is sufficiently privileged, false if not.
  */
-bool in_group_or_capable(struct user_namespace *mnt_userns,
+bool in_group_or_capable(struct mnt_idmap *idmap,
 			 const struct inode *inode, vfsgid_t vfsgid)
 {
 	if (vfsgid_in_group_p(vfsgid))
 		return true;
-	if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
+	if (capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
 		return true;
 	return false;
 }
 
 /**
  * mode_strip_sgid - handle the sgid bit for non-directories
- * @mnt_userns: User namespace of the mount the inode was created from
+ * @idmap: idmap of the mount the inode was created from
  * @dir: parent directory inode
  * @mode: mode of the file to be created in @dir
  *
@@ -2498,14 +2498,16 @@ bool in_group_or_capable(struct user_namespace *mnt_userns,
  *
  * Return: the new mode to use for the file
  */
-umode_t mode_strip_sgid(struct user_namespace *mnt_userns,
+umode_t mode_strip_sgid(struct mnt_idmap *idmap,
 			const struct inode *dir, umode_t mode)
 {
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
+
 	if ((mode & (S_ISGID | S_IXGRP)) != (S_ISGID | S_IXGRP))
 		return mode;
 	if (S_ISDIR(mode) || !dir || !(dir->i_mode & S_ISGID))
 		return mode;
-	if (in_group_or_capable(mnt_userns, dir,
+	if (in_group_or_capable(idmap, dir,
 				i_gid_into_vfsgid(mnt_userns, dir)))
 		return mode;
 	return mode & ~S_ISGID;
diff --git a/fs/internal.h b/fs/internal.h
index 7e6c4d4a9645..6f3d59da9caa 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -134,8 +134,8 @@ extern int vfs_open(const struct path *, struct file *);
  * inode.c
  */
 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
-int dentry_needs_remove_privs(struct user_namespace *, struct dentry *dentry);
-bool in_group_or_capable(struct user_namespace *mnt_userns,
+int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
+bool in_group_or_capable(struct mnt_idmap *idmap,
 			 const struct inode *inode, vfsgid_t vfsgid);
 
 /*
@@ -246,5 +246,5 @@ ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *po
 /*
  * fs/attr.c
  */
-int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
+int setattr_should_drop_sgid(struct mnt_idmap *idmap,
 			     const struct inode *inode);
diff --git a/fs/namei.c b/fs/namei.c
index 6596f7d36896..b2f66f73a451 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -399,7 +399,6 @@ int generic_permission(struct mnt_idmap *idmap, struct inode *inode,
 		       int mask)
 {
 	int ret;
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 
 	/*
 	 * Do the basic permission checks.
@@ -411,10 +410,10 @@ int generic_permission(struct mnt_idmap *idmap, struct inode *inode,
 	if (S_ISDIR(inode->i_mode)) {
 		/* DACs are overridable for directories */
 		if (!(mask & MAY_WRITE))
-			if (capable_wrt_inode_uidgid(mnt_userns, inode,
+			if (capable_wrt_inode_uidgid(idmap, inode,
 						     CAP_DAC_READ_SEARCH))
 				return 0;
-		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+		if (capable_wrt_inode_uidgid(idmap, inode,
 					     CAP_DAC_OVERRIDE))
 			return 0;
 		return -EACCES;
@@ -425,7 +424,7 @@ int generic_permission(struct mnt_idmap *idmap, struct inode *inode,
 	 */
 	mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
 	if (mask == MAY_READ)
-		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+		if (capable_wrt_inode_uidgid(idmap, inode,
 					     CAP_DAC_READ_SEARCH))
 			return 0;
 	/*
@@ -434,7 +433,7 @@ int generic_permission(struct mnt_idmap *idmap, struct inode *inode,
 	 * at least one exec bit set.
 	 */
 	if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
-		if (capable_wrt_inode_uidgid(mnt_userns, inode,
+		if (capable_wrt_inode_uidgid(idmap, inode,
 					     CAP_DAC_OVERRIDE))
 			return 0;
 
@@ -2915,16 +2914,17 @@ int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
 }
 EXPORT_SYMBOL(user_path_at_empty);
 
-int __check_sticky(struct user_namespace *mnt_userns, struct inode *dir,
+int __check_sticky(struct mnt_idmap *idmap, struct inode *dir,
 		   struct inode *inode)
 {
 	kuid_t fsuid = current_fsuid();
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 
 	if (vfsuid_eq_kuid(i_uid_into_vfsuid(mnt_userns, inode), fsuid))
 		return 0;
 	if (vfsuid_eq_kuid(i_uid_into_vfsuid(mnt_userns, dir), fsuid))
 		return 0;
-	return !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FOWNER);
+	return !capable_wrt_inode_uidgid(idmap, inode, CAP_FOWNER);
 }
 EXPORT_SYMBOL(__check_sticky);
 
@@ -2974,7 +2974,7 @@ static int may_delete(struct mnt_idmap *idmap, struct inode *dir,
 	if (IS_APPEND(dir))
 		return -EPERM;
 
-	if (check_sticky(mnt_userns, dir, inode) || IS_APPEND(inode) ||
+	if (check_sticky(idmap, dir, inode) || IS_APPEND(inode) ||
 	    IS_IMMUTABLE(inode) || IS_SWAPFILE(inode) ||
 	    HAS_UNMAPPED_ID(idmap, inode))
 		return -EPERM;
@@ -3061,7 +3061,7 @@ EXPORT_SYMBOL(unlock_rename);
 
 /**
  * vfs_prepare_mode - prepare the mode to be used for a new inode
- * @mnt_userns:		user namespace of the mount the inode was found from
+ * @idmap:	idmap of the mount the inode was found from
  * @dir:	parent directory of the new inode
  * @mode:	mode of the new inode
  * @mask_perms:	allowed permission by the vfs
@@ -3082,11 +3082,11 @@ EXPORT_SYMBOL(unlock_rename);
  *
  * Returns: mode to be passed to the filesystem
  */
-static inline umode_t vfs_prepare_mode(struct user_namespace *mnt_userns,
+static inline umode_t vfs_prepare_mode(struct mnt_idmap *idmap,
 				       const struct inode *dir, umode_t mode,
 				       umode_t mask_perms, umode_t type)
 {
-	mode = mode_strip_sgid(mnt_userns, dir, mode);
+	mode = mode_strip_sgid(idmap, dir, mode);
 	mode = mode_strip_umask(dir, mode);
 
 	/*
@@ -3118,7 +3118,6 @@ static inline umode_t vfs_prepare_mode(struct user_namespace *mnt_userns,
 int vfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	       struct dentry *dentry, umode_t mode, bool want_excl)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	int error;
 
 	error = may_create(idmap, dir, dentry);
@@ -3128,7 +3127,7 @@ int vfs_create(struct mnt_idmap *idmap, struct inode *dir,
 	if (!dir->i_op->create)
 		return -EACCES;	/* shouldn't it be ENOSYS? */
 
-	mode = vfs_prepare_mode(mnt_userns, dir, mode, S_IALLUGO, S_IFREG);
+	mode = vfs_prepare_mode(idmap, dir, mode, S_IALLUGO, S_IFREG);
 	error = security_inode_create(dir, dentry, mode);
 	if (error)
 		return error;
@@ -3340,7 +3339,6 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 				  bool got_write)
 {
 	struct mnt_idmap *idmap;
-	struct user_namespace *mnt_userns;
 	struct dentry *dir = nd->path.dentry;
 	struct inode *dir_inode = dir->d_inode;
 	int open_flag = op->open_flag;
@@ -3389,11 +3387,10 @@ static struct dentry *lookup_open(struct nameidata *nd, struct file *file,
 	if (unlikely(!got_write))
 		open_flag &= ~O_TRUNC;
 	idmap = mnt_idmap(nd->path.mnt);
-	mnt_userns = mnt_idmap_owner(idmap);
 	if (open_flag & O_CREAT) {
 		if (open_flag & O_EXCL)
 			open_flag &= ~O_TRUNC;
-		mode = vfs_prepare_mode(mnt_userns, dir->d_inode, mode, mode, mode);
+		mode = vfs_prepare_mode(idmap, dir->d_inode, mode, mode, mode);
 		if (likely(got_write))
 			create_error = may_o_create(idmap, &nd->path,
 						    dentry, mode);
@@ -3613,7 +3610,6 @@ static int vfs_tmpfile(struct mnt_idmap *idmap,
 		       const struct path *parentpath,
 		       struct file *file, umode_t mode)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	struct dentry *child;
 	struct inode *dir = d_inode(parentpath->dentry);
 	struct inode *inode;
@@ -3631,7 +3627,7 @@ static int vfs_tmpfile(struct mnt_idmap *idmap,
 		return -ENOMEM;
 	file->f_path.mnt = parentpath->mnt;
 	file->f_path.dentry = child;
-	mode = vfs_prepare_mode(mnt_userns, dir, mode, mode, mode);
+	mode = vfs_prepare_mode(idmap, dir, mode, mode, mode);
 	error = dir->i_op->tmpfile(idmap, dir, file, mode);
 	dput(child);
 	if (error)
@@ -3919,7 +3915,6 @@ EXPORT_SYMBOL(user_path_create);
 int vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 	      struct dentry *dentry, umode_t mode, dev_t dev)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	bool is_whiteout = S_ISCHR(mode) && dev == WHITEOUT_DEV;
 	int error = may_create(idmap, dir, dentry);
 
@@ -3933,7 +3928,7 @@ int vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 	if (!dir->i_op->mknod)
 		return -EPERM;
 
-	mode = vfs_prepare_mode(mnt_userns, dir, mode, mode, mode);
+	mode = vfs_prepare_mode(idmap, dir, mode, mode, mode);
 	error = devcgroup_inode_mknod(mode, dev);
 	if (error)
 		return error;
@@ -4046,7 +4041,6 @@ SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, d
 int vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	      struct dentry *dentry, umode_t mode)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	int error;
 	unsigned max_links = dir->i_sb->s_max_links;
 
@@ -4057,7 +4051,7 @@ int vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	if (!dir->i_op->mkdir)
 		return -EPERM;
 
-	mode = vfs_prepare_mode(mnt_userns, dir, mode, S_IRWXUGO | S_ISVTX, 0);
+	mode = vfs_prepare_mode(idmap, dir, mode, S_IRWXUGO | S_ISVTX, 0);
 	error = security_inode_mkdir(dir, dentry, mode);
 	if (error)
 		return error;
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 59e70296baf6..728460a27786 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1991,7 +1991,7 @@ static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
 		}
 	}
 
-	if (file && setattr_should_drop_suidgid(&init_user_ns, file_inode(file))) {
+	if (file && setattr_should_drop_suidgid(&nop_mnt_idmap, file_inode(file))) {
 		ret = __ocfs2_write_remove_suid(inode, di_bh);
 		if (ret) {
 			mlog_errno(ret);
@@ -2279,7 +2279,7 @@ static int ocfs2_prepare_inode_for_write(struct file *file,
 		 * inode. There's also the dinode i_size state which
 		 * can be lost via setattr during extending writes (we
 		 * set inode->i_size at the end of a write. */
-		if (setattr_should_drop_suidgid(&init_user_ns, inode)) {
+		if (setattr_should_drop_suidgid(&nop_mnt_idmap, inode)) {
 			if (meta_level == 0) {
 				ocfs2_inode_unlock_for_extent_tree(inode,
 								   &di_bh,
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index a76885411b9a..8309cd8c1a35 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -197,7 +197,7 @@ static struct inode *ocfs2_get_init_inode(struct inode *dir, umode_t mode)
 	 * callers. */
 	if (S_ISDIR(mode))
 		set_nlink(inode, 2);
-	mode = mode_strip_sgid(&init_user_ns, dir, mode);
+	mode = mode_strip_sgid(&nop_mnt_idmap, dir, mode);
 	inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
 	status = dquot_initialize(inode);
 	if (status)
diff --git a/fs/open.c b/fs/open.c
index 9bba9008010f..754904a7f209 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -39,7 +39,6 @@
 int do_truncate(struct mnt_idmap *idmap, struct dentry *dentry,
 		loff_t length, unsigned int time_attrs, struct file *filp)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	int ret;
 	struct iattr newattrs;
 
@@ -55,7 +54,7 @@ int do_truncate(struct mnt_idmap *idmap, struct dentry *dentry,
 	}
 
 	/* Remove suid, sgid, and file capabilities on truncate too */
-	ret = dentry_needs_remove_privs(mnt_userns, dentry);
+	ret = dentry_needs_remove_privs(idmap, dentry);
 	if (ret < 0)
 		return ret;
 	if (ret)
@@ -744,7 +743,7 @@ retry_deleg:
 	inode_lock(inode);
 	if (!S_ISDIR(inode->i_mode))
 		newattrs.ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV |
-				     setattr_should_drop_sgid(mnt_userns, inode);
+				     setattr_should_drop_sgid(idmap, inode);
 	/* Continue to send actual fs values, not the mount values. */
 	error = security_path_chown(
 		path,
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index f54c312d76b8..f637dd0b0dc9 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -565,7 +565,7 @@ int ovl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 	 */
 	if (unlikely(inode->i_mode & S_ISGID) && type == ACL_TYPE_ACCESS &&
 	    !in_group_p(inode->i_gid) &&
-	    !capable_wrt_inode_uidgid(&init_user_ns, inode, CAP_FSETID)) {
+	    !capable_wrt_inode_uidgid(&nop_mnt_idmap, inode, CAP_FSETID)) {
 		struct iattr iattr = { .ia_valid = ATTR_KILL_SGID };
 
 		err = ovl_setattr(&nop_mnt_idmap, dentry, &iattr);
diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index 9781718197bd..97ed5b6feae8 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -720,7 +720,7 @@ int posix_acl_update_mode(struct mnt_idmap *idmap,
 	if (error == 0)
 		*acl = NULL;
 	if (!vfsgid_in_group_p(i_gid_into_vfsgid(mnt_userns, inode)) &&
-	    !capable_wrt_inode_uidgid(mnt_userns, inode, CAP_FSETID))
+	    !capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
 		mode &= ~S_ISGID;
 	*mode_p = mode;
 	return 0;
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 1019a90c50b6..7abfd741945e 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1301,7 +1301,6 @@ xfs_fileattr_set(
 	struct dentry		*dentry,
 	struct fileattr		*fa)
 {
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 	struct xfs_inode	*ip = XFS_I(d_inode(dentry));
 	struct xfs_mount	*mp = ip->i_mount;
 	struct xfs_trans	*tp;
@@ -1372,7 +1371,7 @@ xfs_fileattr_set(
 	 */
 
 	if ((VFS_I(ip)->i_mode & (S_ISUID|S_ISGID)) &&
-	    !capable_wrt_inode_uidgid(mnt_userns, VFS_I(ip), CAP_FSETID))
+	    !capable_wrt_inode_uidgid(idmap, VFS_I(ip), CAP_FSETID))
 		VFS_I(ip)->i_mode &= ~(S_ISUID|S_ISGID);
 
 	/* Change the ownerships and register project quota modifications */
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 0a8ba82ef1af..03c2a613ad40 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -249,9 +249,9 @@ static inline bool ns_capable_setid(struct user_namespace *ns, int cap)
 }
 #endif /* CONFIG_MULTIUSER */
 bool privileged_wrt_inode_uidgid(struct user_namespace *ns,
-				 struct user_namespace *mnt_userns,
+				 struct mnt_idmap *idmap,
 				 const struct inode *inode);
-bool capable_wrt_inode_uidgid(struct user_namespace *mnt_userns,
+bool capable_wrt_inode_uidgid(struct mnt_idmap *idmap,
 			      const struct inode *inode, int cap);
 extern bool file_ns_capable(const struct file *file, struct user_namespace *ns, int cap);
 extern bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 13b5f4d53238..2026a8b6758d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2135,7 +2135,7 @@ extern long compat_ptr_ioctl(struct file *file, unsigned int cmd,
 void inode_init_owner(struct mnt_idmap *idmap, struct inode *inode,
 		      const struct inode *dir, umode_t mode);
 extern bool may_open_dev(const struct path *path);
-umode_t mode_strip_sgid(struct user_namespace *mnt_userns,
+umode_t mode_strip_sgid(struct mnt_idmap *idmap,
 			const struct inode *dir, umode_t mode);
 
 /*
@@ -3038,7 +3038,7 @@ static inline int path_permission(const struct path *path, int mask)
 	return inode_permission(mnt_idmap(path->mnt),
 				d_inode(path->dentry), mask);
 }
-int __check_sticky(struct user_namespace *mnt_userns, struct inode *dir,
+int __check_sticky(struct mnt_idmap *idmap, struct inode *dir,
 		   struct inode *inode);
 
 static inline bool execute_ok(struct inode *inode)
@@ -3275,7 +3275,7 @@ extern void __destroy_inode(struct inode *);
 extern struct inode *new_inode_pseudo(struct super_block *sb);
 extern struct inode *new_inode(struct super_block *sb);
 extern void free_inode_nonrcu(struct inode *inode);
-extern int setattr_should_drop_suidgid(struct user_namespace *, struct inode *);
+extern int setattr_should_drop_suidgid(struct mnt_idmap *, struct inode *);
 extern int file_remove_privs(struct file *);
 
 /*
@@ -3712,13 +3712,13 @@ static inline bool is_sxid(umode_t mode)
 	return mode & (S_ISUID | S_ISGID);
 }
 
-static inline int check_sticky(struct user_namespace *mnt_userns,
+static inline int check_sticky(struct mnt_idmap *idmap,
 			       struct inode *dir, struct inode *inode)
 {
 	if (!(dir->i_mode & S_ISVTX))
 		return 0;
 
-	return __check_sticky(mnt_userns, dir, inode);
+	return __check_sticky(idmap, dir, inode);
 }
 
 static inline void inode_has_no_xattr(struct inode *inode)
diff --git a/kernel/capability.c b/kernel/capability.c
index 860fd22117c1..509a9cfb29f2 100644
--- a/kernel/capability.c
+++ b/kernel/capability.c
@@ -486,9 +486,11 @@ EXPORT_SYMBOL(file_ns_capable);
  * Return true if the inode uid and gid are within the namespace.
  */
 bool privileged_wrt_inode_uidgid(struct user_namespace *ns,
-				 struct user_namespace *mnt_userns,
+				 struct mnt_idmap *idmap,
 				 const struct inode *inode)
 {
+	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
+
 	return vfsuid_has_mapping(ns, i_uid_into_vfsuid(mnt_userns, inode)) &&
 	       vfsgid_has_mapping(ns, i_gid_into_vfsgid(mnt_userns, inode));
 }
@@ -502,13 +504,13 @@ bool privileged_wrt_inode_uidgid(struct user_namespace *ns,
  * its own user namespace and that the given inode's uid and gid are
  * mapped into the current user namespace.
  */
-bool capable_wrt_inode_uidgid(struct user_namespace *mnt_userns,
+bool capable_wrt_inode_uidgid(struct mnt_idmap *idmap,
 			      const struct inode *inode, int cap)
 {
 	struct user_namespace *ns = current_user_ns();
 
 	return ns_capable(ns, cap) &&
-	       privileged_wrt_inode_uidgid(ns, mnt_userns, inode);
+	       privileged_wrt_inode_uidgid(ns, idmap, inode);
 }
 EXPORT_SYMBOL(capable_wrt_inode_uidgid);
 
diff --git a/security/commoncap.c b/security/commoncap.c
index b70ba98fbd1c..beda11fa50f9 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -546,7 +546,7 @@ int cap_convert_nscap(struct mnt_idmap *idmap, struct dentry *dentry,
 		return -EINVAL;
 	if (!validheader(size, cap))
 		return -EINVAL;
-	if (!capable_wrt_inode_uidgid(mnt_userns, inode, CAP_SETFCAP))
+	if (!capable_wrt_inode_uidgid(idmap, inode, CAP_SETFCAP))
 		return -EPERM;
 	if (size == XATTR_CAPS_SZ_2 && (idmap == &nop_mnt_idmap))
 		if (ns_capable(inode->i_sb->s_user_ns, CAP_SETFCAP))
@@ -1039,7 +1039,6 @@ int cap_inode_removexattr(struct mnt_idmap *idmap,
 			  struct dentry *dentry, const char *name)
 {
 	struct user_namespace *user_ns = dentry->d_sb->s_user_ns;
-	struct user_namespace *mnt_userns = mnt_idmap_owner(idmap);
 
 	/* Ignore non-security xattrs */
 	if (strncmp(name, XATTR_SECURITY_PREFIX,
@@ -1051,7 +1050,7 @@ int cap_inode_removexattr(struct mnt_idmap *idmap,
 		struct inode *inode = d_backing_inode(dentry);
 		if (!inode)
 			return -EINVAL;
-		if (!capable_wrt_inode_uidgid(mnt_userns, inode, CAP_SETFCAP))
+		if (!capable_wrt_inode_uidgid(idmap, inode, CAP_SETFCAP))
 			return -EPERM;
 		return 0;
 	}