f2fs: switch to fscrypt_prepare_link()

Reviewed-by: NChao Yu <yuchao0@huawei.com>
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/namei.c

@@ -240,9 +240,9 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
 	if (unlikely(f2fs_cp_error(sbi)))
 		return -EIO;
 
-	if (f2fs_encrypted_inode(dir) &&
-			!fscrypt_has_permitted_context(dir, inode))
-		return -EPERM;
+	err = fscrypt_prepare_link(old_dentry, dir, dentry);
+	if (err)
+		return err;
 
 	if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
 			(!projid_eq(F2FS_I(dir)->i_projid,