Merge tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping

Pull vfs idmapping updates from Christian Brauner:

 - Last cycle we introduced the dedicated struct mnt_idmap type for
   mount idmapping and the required infrastucture in 256c8aed2b42 ("fs:
   introduce dedicated idmap type for mounts"). As promised in last
   cycle's pull request message this converts everything to rely on
   struct mnt_idmap.

   Currently we still pass around the plain namespace that was attached
   to a mount. This is in general pretty convenient but it makes it easy
   to conflate namespaces that are relevant on the filesystem with
   namespaces that are relevant on the mount level. Especially for
   non-vfs developers without detailed knowledge in this area this was a
   potential source for bugs.

   This finishes the conversion. Instead of passing the plain namespace
   around this updates all places that currently take a pointer to a
   mnt_userns with a pointer to struct mnt_idmap.

   Now that the conversion is done all helpers down to the really
   low-level helpers only accept a struct mnt_idmap argument instead of
   two namespace arguments.

   Conflating mount and other idmappings will now cause the compiler to
   complain loudly thus eliminating the possibility of any bugs. This
   makes it impossible for filesystem developers to mix up mount and
   filesystem idmappings as they are two distinct types and require
   distinct helpers that cannot be used interchangeably.

   Everything associated with struct mnt_idmap is moved into a single
   separate file. With that change no code can poke around in struct
   mnt_idmap. It can only be interacted with through dedicated helpers.
   That means all filesystems are and all of the vfs is completely
   oblivious to the actual implementation of idmappings.

   We are now also able to extend struct mnt_idmap as we see fit. For
   example, we can decouple it completely from namespaces for users that
   don't require or don't want to use them at all. We can also extend
   the concept of idmappings so we can cover filesystem specific
   requirements.

   In combination with the vfs{g,u}id_t work we finished in v6.2 this
   makes this feature substantially more robust and thus difficult to
   implement wrong by a given filesystem and also protects the vfs.

 - Enable idmapped mounts for tmpfs and fulfill a longstanding request.

   A long-standing request from users had been to make it possible to
   create idmapped mounts for tmpfs. For example, to share the host's
   tmpfs mount between multiple sandboxes. This is a prerequisite for
   some advanced Kubernetes cases. Systemd also has a range of use-cases
   to increase service isolation. And there are more users of this.

   However, with all of the other work going on this was way down on the
   priority list but luckily someone other than ourselves picked this
   up.

   As usual the patch is tiny as all the infrastructure work had been
   done multiple kernel releases ago. In addition to all the tests that
   we already have I requested that Rodrigo add a dedicated tmpfs
   testsuite for idmapped mounts to xfstests. It is to be included into
   xfstests during the v6.3 development cycle. This should add a slew of
   additional tests.

* tag 'fs.idmapped.v6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping: (26 commits)
  shmem: support idmapped mounts for tmpfs
  fs: move mnt_idmap
  fs: port vfs{g,u}id helpers to mnt_idmap
  fs: port fs{g,u}id helpers to mnt_idmap
  fs: port i_{g,u}id_into_vfs{g,u}id() to mnt_idmap
  fs: port i_{g,u}id_{needs_}update() to mnt_idmap
  quota: port to mnt_idmap
  fs: port privilege checking helpers to mnt_idmap
  fs: port inode_owner_or_capable() to mnt_idmap
  fs: port inode_init_owner() to mnt_idmap
  fs: port acl to mnt_idmap
  fs: port xattr to mnt_idmap
  fs: port ->permission() to pass mnt_idmap
  fs: port ->fileattr_set() to pass mnt_idmap
  fs: port ->set_acl() to pass mnt_idmap
  fs: port ->get_acl() to pass mnt_idmap
  fs: port ->tmpfile() to pass mnt_idmap
  fs: port ->rename() to pass mnt_idmap
  fs: port ->mknod() to pass mnt_idmap
  fs: port ->mkdir() to pass mnt_idmap
  ...

7 files changed, 68 insertions, 68 deletions

diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index c1c74aa658ae..ec2aeccb69a3 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -204,7 +204,7 @@ 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)
 {
@@ -219,14 +219,14 @@ static int f2fs_acl_update_mode(struct user_namespace *mnt_userns,
 		return error;
 	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))
+	if (!vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)) &&
+	    !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 +240,7 @@ 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;
@@ -276,7 +276,7 @@ static int __f2fs_set_acl(struct user_namespace *mnt_userns,
 	return error;
 }
 
-int f2fs_set_acl(struct user_namespace *mnt_userns, struct dentry *dentry,
+int f2fs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct posix_acl *acl, int type)
 {
 	struct inode *inode = d_inode(dentry);
@@ -284,7 +284,7 @@ int f2fs_set_acl(struct user_namespace *mnt_userns, struct dentry *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/acl.h b/fs/f2fs/acl.h
index ea2bbb3f264b..94ebfbfbdc6f 100644
--- a/fs/f2fs/acl.h
+++ b/fs/f2fs/acl.h
@@ -34,7 +34,7 @@ struct f2fs_acl_header {
 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 
 extern struct posix_acl *f2fs_get_acl(struct inode *, int, bool);
-extern int f2fs_set_acl(struct user_namespace *, struct dentry *,
+extern int f2fs_set_acl(struct mnt_idmap *, struct dentry *,
 			struct posix_acl *, int);
 extern int f2fs_init_acl(struct inode *, struct inode *, struct page *,
 							struct page *);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e8953c3dc81a..9a3ffa39ad30 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3469,15 +3469,15 @@ void f2fs_truncate_data_blocks(struct dnode_of_data *dn);
 int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock);
 int f2fs_truncate(struct inode *inode);
-int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+int f2fs_getattr(struct mnt_idmap *idmap, const struct path *path,
 		 struct kstat *stat, u32 request_mask, unsigned int flags);
-int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct iattr *attr);
 int f2fs_truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
 void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count);
 int f2fs_precache_extents(struct inode *inode);
 int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
-int f2fs_fileattr_set(struct user_namespace *mnt_userns,
+int f2fs_fileattr_set(struct mnt_idmap *idmap,
 		      struct dentry *dentry, struct fileattr *fa);
 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
@@ -3505,7 +3505,7 @@ void f2fs_handle_failed_inode(struct inode *inode);
 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
 							bool hot, bool set);
 struct dentry *f2fs_get_parent(struct dentry *child);
-int f2fs_get_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 		     struct inode **new_inode);
 
 /*
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index ecbc8c135b49..b90617639743 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -837,7 +837,7 @@ static bool f2fs_force_buffered_io(struct inode *inode, int rw)
 	return false;
 }
 
-int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
+int f2fs_getattr(struct mnt_idmap *idmap, const struct path *path,
 		 struct kstat *stat, u32 request_mask, unsigned int query_flags)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -892,7 +892,7 @@ int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 				  STATX_ATTR_NODUMP |
 				  STATX_ATTR_VERITY);
 
-	generic_fillattr(mnt_userns, inode, stat);
+	generic_fillattr(idmap, inode, stat);
 
 	/* we need to show initial sectors used for inline_data/dentries */
 	if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
@@ -903,13 +903,13 @@ int f2fs_getattr(struct user_namespace *mnt_userns, const struct path *path,
 }
 
 #ifdef CONFIG_F2FS_FS_POSIX_ACL
-static void __setattr_copy(struct user_namespace *mnt_userns,
+static void __setattr_copy(struct mnt_idmap *idmap,
 			   struct inode *inode, const struct iattr *attr)
 {
 	unsigned int ia_valid = attr->ia_valid;
 
-	i_uid_update(mnt_userns, attr, inode);
-	i_gid_update(mnt_userns, attr, inode);
+	i_uid_update(idmap, attr, inode);
+	i_gid_update(idmap, attr, inode);
 	if (ia_valid & ATTR_ATIME)
 		inode->i_atime = attr->ia_atime;
 	if (ia_valid & ATTR_MTIME)
@@ -918,10 +918,10 @@ static void __setattr_copy(struct user_namespace *mnt_userns,
 		inode->i_ctime = attr->ia_ctime;
 	if (ia_valid & ATTR_MODE) {
 		umode_t mode = attr->ia_mode;
-		vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode);
+		vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, 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);
 	}
@@ -930,7 +930,7 @@ static void __setattr_copy(struct user_namespace *mnt_userns,
 #define __setattr_copy setattr_copy
 #endif
 
-int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
+int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 		 struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
@@ -951,7 +951,7 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 		!f2fs_is_compress_backend_ready(inode))
 		return -EOPNOTSUPP;
 
-	err = setattr_prepare(mnt_userns, dentry, attr);
+	err = setattr_prepare(idmap, dentry, attr);
 	if (err)
 		return err;
 
@@ -963,15 +963,15 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 	if (err)
 		return err;
 
-	if (is_quota_modification(mnt_userns, inode, attr)) {
+	if (is_quota_modification(idmap, inode, attr)) {
 		err = f2fs_dquot_initialize(inode);
 		if (err)
 			return err;
 	}
-	if (i_uid_needs_update(mnt_userns, attr, inode) ||
-	    i_gid_needs_update(mnt_userns, attr, inode)) {
+	if (i_uid_needs_update(idmap, attr, inode) ||
+	    i_gid_needs_update(idmap, attr, inode)) {
 		f2fs_lock_op(F2FS_I_SB(inode));
-		err = dquot_transfer(mnt_userns, inode, attr);
+		err = dquot_transfer(idmap, inode, attr);
 		if (err) {
 			set_sbi_flag(F2FS_I_SB(inode),
 					SBI_QUOTA_NEED_REPAIR);
@@ -982,8 +982,8 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 		 * update uid/gid under lock_op(), so that dquot and inode can
 		 * be updated atomically.
 		 */
-		i_uid_update(mnt_userns, attr, inode);
-		i_gid_update(mnt_userns, attr, inode);
+		i_uid_update(idmap, attr, inode);
+		i_gid_update(idmap, attr, inode);
 		f2fs_mark_inode_dirty_sync(inode, true);
 		f2fs_unlock_op(F2FS_I_SB(inode));
 	}
@@ -1023,10 +1023,10 @@ int f2fs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
 		spin_unlock(&F2FS_I(inode)->i_size_lock);
 	}
 
-	__setattr_copy(mnt_userns, inode, attr);
+	__setattr_copy(idmap, inode, attr);
 
 	if (attr->ia_valid & ATTR_MODE) {
-		err = posix_acl_chmod(mnt_userns, dentry, f2fs_get_inode_mode(inode));
+		err = posix_acl_chmod(idmap, dentry, f2fs_get_inode_mode(inode));
 
 		if (is_inode_flag_set(inode, FI_ACL_MODE)) {
 			if (!err)
@@ -2038,14 +2038,14 @@ static int f2fs_ioc_getversion(struct file *filp, unsigned long arg)
 static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
 {
 	struct inode *inode = file_inode(filp);
-	struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
+	struct mnt_idmap *idmap = file_mnt_idmap(filp);
 	struct f2fs_inode_info *fi = F2FS_I(inode);
 	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 	struct inode *pinode;
 	loff_t isize;
 	int ret;
 
-	if (!inode_owner_or_capable(mnt_userns, inode))
+	if (!inode_owner_or_capable(idmap, inode))
 		return -EACCES;
 
 	if (!S_ISREG(inode->i_mode))
@@ -2095,7 +2095,7 @@ static int f2fs_ioc_start_atomic_write(struct file *filp, bool truncate)
 		goto out;
 	}
 
-	ret = f2fs_get_tmpfile(mnt_userns, pinode, &fi->cow_inode);
+	ret = f2fs_get_tmpfile(idmap, pinode, &fi->cow_inode);
 	iput(pinode);
 	if (ret) {
 		f2fs_up_write(&fi->i_gc_rwsem[WRITE]);
@@ -2135,10 +2135,10 @@ out:
 static int f2fs_ioc_commit_atomic_write(struct file *filp)
 {
 	struct inode *inode = file_inode(filp);
-	struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
+	struct mnt_idmap *idmap = file_mnt_idmap(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(mnt_userns, inode))
+	if (!inode_owner_or_capable(idmap, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
@@ -2167,10 +2167,10 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
 static int f2fs_ioc_abort_atomic_write(struct file *filp)
 {
 	struct inode *inode = file_inode(filp);
-	struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
+	struct mnt_idmap *idmap = file_mnt_idmap(filp);
 	int ret;
 
-	if (!inode_owner_or_capable(mnt_userns, inode))
+	if (!inode_owner_or_capable(idmap, inode))
 		return -EACCES;
 
 	ret = mnt_want_write_file(filp);
@@ -3090,7 +3090,7 @@ int f2fs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 	return 0;
 }
 
-int f2fs_fileattr_set(struct user_namespace *mnt_userns,
+int f2fs_fileattr_set(struct mnt_idmap *idmap,
 		      struct dentry *dentry, struct fileattr *fa)
 {
 	struct inode *inode = d_inode(dentry);
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 6032589099ce..d8e01bbbf27f 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -202,7 +202,7 @@ static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
 		file_set_hot(inode);
 }
 
-static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
+static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
 						struct inode *dir, umode_t mode,
 						const char *name)
 {
@@ -225,7 +225,7 @@ static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
 
 	nid_free = true;
 
-	inode_init_owner(mnt_userns, inode, dir, mode);
+	inode_init_owner(idmap, inode, dir, mode);
 
 	inode->i_ino = ino;
 	inode->i_blocks = 0;
@@ -246,7 +246,7 @@ static struct inode *f2fs_new_inode(struct user_namespace *mnt_userns,
 		(F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
 		F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
 	else
-		F2FS_I(inode)->i_projid = make_kprojid(mnt_userns,
+		F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
 							F2FS_DEF_PROJID);
 
 	err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
@@ -333,7 +333,7 @@ fail_drop:
 	return ERR_PTR(err);
 }
 
-static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
+static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
 		       struct dentry *dentry, umode_t mode, bool excl)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
@@ -350,7 +350,7 @@ static int f2fs_create(struct user_namespace *mnt_userns, struct inode *dir,
 	if (err)
 		return err;
 
-	inode = f2fs_new_inode(mnt_userns, dir, mode, dentry->d_name.name);
+	inode = f2fs_new_inode(idmap, dir, mode, dentry->d_name.name);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
@@ -659,7 +659,7 @@ static const char *f2fs_get_link(struct dentry *dentry,
 	return link;
 }
 
-static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
+static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
 			struct dentry *dentry, const char *symname)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
@@ -682,7 +682,7 @@ static int f2fs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
 	if (err)
 		return err;
 
-	inode = f2fs_new_inode(mnt_userns, dir, S_IFLNK | S_IRWXUGO, NULL);
+	inode = f2fs_new_inode(idmap, dir, S_IFLNK | S_IRWXUGO, NULL);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
@@ -739,7 +739,7 @@ out_free_encrypted_link:
 	return err;
 }
 
-static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
+static int f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 		      struct dentry *dentry, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
@@ -753,7 +753,7 @@ static int f2fs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 	if (err)
 		return err;
 
-	inode = f2fs_new_inode(mnt_userns, dir, S_IFDIR | mode, NULL);
+	inode = f2fs_new_inode(idmap, dir, S_IFDIR | mode, NULL);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
@@ -794,7 +794,7 @@ static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
 	return -ENOTEMPTY;
 }
 
-static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
+static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
 		      struct dentry *dentry, umode_t mode, dev_t rdev)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
@@ -810,7 +810,7 @@ static int f2fs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
 	if (err)
 		return err;
 
-	inode = f2fs_new_inode(mnt_userns, dir, mode, NULL);
+	inode = f2fs_new_inode(idmap, dir, mode, NULL);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
@@ -837,7 +837,7 @@ out:
 	return err;
 }
 
-static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+static int __f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 			  struct file *file, umode_t mode, bool is_whiteout,
 			  struct inode **new_inode)
 {
@@ -849,7 +849,7 @@ static int __f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 	if (err)
 		return err;
 
-	inode = f2fs_new_inode(mnt_userns, dir, mode, NULL);
+	inode = f2fs_new_inode(idmap, dir, mode, NULL);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
@@ -907,7 +907,7 @@ out:
 	return err;
 }
 
-static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+static int f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 			struct file *file, umode_t mode)
 {
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
@@ -918,28 +918,28 @@ static int f2fs_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
 	if (!f2fs_is_checkpoint_ready(sbi))
 		return -ENOSPC;
 
-	err = __f2fs_tmpfile(mnt_userns, dir, file, mode, false, NULL);
+	err = __f2fs_tmpfile(idmap, dir, file, mode, false, NULL);
 
 	return finish_open_simple(file, err);
 }
 
-static int f2fs_create_whiteout(struct user_namespace *mnt_userns,
+static int f2fs_create_whiteout(struct mnt_idmap *idmap,
 				struct inode *dir, struct inode **whiteout)
 {
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
 		return -EIO;
 
-	return __f2fs_tmpfile(mnt_userns, dir, NULL,
+	return __f2fs_tmpfile(idmap, dir, NULL,
 				S_IFCHR | WHITEOUT_MODE, true, whiteout);
 }
 
-int f2fs_get_tmpfile(struct user_namespace *mnt_userns, struct inode *dir,
+int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
 		     struct inode **new_inode)
 {
-	return __f2fs_tmpfile(mnt_userns, dir, NULL, S_IFREG, false, new_inode);
+	return __f2fs_tmpfile(idmap, dir, NULL, S_IFREG, false, new_inode);
 }
 
-static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
+static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			struct dentry *old_dentry, struct inode *new_dir,
 			struct dentry *new_dentry, unsigned int flags)
 {
@@ -979,7 +979,7 @@ static int f2fs_rename(struct user_namespace *mnt_userns, struct inode *old_dir,
 	}
 
 	if (flags & RENAME_WHITEOUT) {
-		err = f2fs_create_whiteout(mnt_userns, old_dir, &whiteout);
+		err = f2fs_create_whiteout(idmap, old_dir, &whiteout);
 		if (err)
 			return err;
 	}
@@ -1295,7 +1295,7 @@ out:
 	return err;
 }
 
-static int f2fs_rename2(struct user_namespace *mnt_userns,
+static int f2fs_rename2(struct mnt_idmap *idmap,
 			struct inode *old_dir, struct dentry *old_dentry,
 			struct inode *new_dir, struct dentry *new_dentry,
 			unsigned int flags)
@@ -1318,7 +1318,7 @@ static int f2fs_rename2(struct user_namespace *mnt_userns,
 	 * VFS has already handled the new dentry existence case,
 	 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
 	 */
-	return f2fs_rename(mnt_userns, old_dir, old_dentry,
+	return f2fs_rename(idmap, old_dir, old_dentry,
 					new_dir, new_dentry, flags);
 }
 
@@ -1342,12 +1342,12 @@ static const char *f2fs_encrypted_get_link(struct dentry *dentry,
 	return target;
 }
 
-static int f2fs_encrypted_symlink_getattr(struct user_namespace *mnt_userns,
+static int f2fs_encrypted_symlink_getattr(struct mnt_idmap *idmap,
 					  const struct path *path,
 					  struct kstat *stat, u32 request_mask,
 					  unsigned int query_flags)
 {
-	f2fs_getattr(mnt_userns, path, stat, request_mask, query_flags);
+	f2fs_getattr(idmap, path, stat, request_mask, query_flags);
 
 	return fscrypt_symlink_getattr(path, stat);
 }
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 77fd453949b1..dfd41908b12d 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -258,15 +258,15 @@ static int recover_quota_data(struct inode *inode, struct page *page)
 	attr.ia_vfsuid = VFSUIDT_INIT(make_kuid(inode->i_sb->s_user_ns, i_uid));
 	attr.ia_vfsgid = VFSGIDT_INIT(make_kgid(inode->i_sb->s_user_ns, i_gid));
 
-	if (!vfsuid_eq(attr.ia_vfsuid, i_uid_into_vfsuid(&init_user_ns, inode)))
+	if (!vfsuid_eq(attr.ia_vfsuid, i_uid_into_vfsuid(&nop_mnt_idmap, inode)))
 		attr.ia_valid |= ATTR_UID;
-	if (!vfsgid_eq(attr.ia_vfsgid, i_gid_into_vfsgid(&init_user_ns, inode)))
+	if (!vfsgid_eq(attr.ia_vfsgid, i_gid_into_vfsgid(&nop_mnt_idmap, inode)))
 		attr.ia_valid |= ATTR_GID;
 
 	if (!attr.ia_valid)
 		return 0;
 
-	err = dquot_transfer(&init_user_ns, inode, &attr);
+	err = dquot_transfer(&nop_mnt_idmap, inode, &attr);
 	if (err)
 		set_sbi_flag(F2FS_I_SB(inode), SBI_QUOTA_NEED_REPAIR);
 	return err;
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index dc2e8637189e..d92edbbdc30e 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -65,7 +65,7 @@ static int f2fs_xattr_generic_get(const struct xattr_handler *handler,
 }
 
 static int f2fs_xattr_generic_set(const struct xattr_handler *handler,
-		struct user_namespace *mnt_userns,
+		struct mnt_idmap *idmap,
 		struct dentry *unused, struct inode *inode,
 		const char *name, const void *value,
 		size_t size, int flags)
@@ -109,7 +109,7 @@ static int f2fs_xattr_advise_get(const struct xattr_handler *handler,
 }
 
 static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
-		struct user_namespace *mnt_userns,
+		struct mnt_idmap *idmap,
 		struct dentry *unused, struct inode *inode,
 		const char *name, const void *value,
 		size_t size, int flags)
@@ -117,7 +117,7 @@ static int f2fs_xattr_advise_set(const struct xattr_handler *handler,
 	unsigned char old_advise = F2FS_I(inode)->i_advise;
 	unsigned char new_advise;
 
-	if (!inode_owner_or_capable(&init_user_ns, inode))
+	if (!inode_owner_or_capable(&nop_mnt_idmap, inode))
 		return -EPERM;
 	if (value == NULL)
 		return -EINVAL;