[vfs:ovl-candidate 9/20] fs//overlayfs/file.c:20:23: error: 'sb' undeclared

[vfs:ovl-candidate 9/20] fs//overlayfs/file.c:20:23: error: 'sb' undeclared

[kbuild test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git ovl-candidate
head:   c50c5708e327bcb7feba617f4d9d9a9392950134
commit: c56190faa27f4efe2a4b246e67be207c120cfe07 [9/20] ovl: stack file ops
config: x86_64-randconfig-u0-07131607 (attached as .config)
compiler: gcc-5 (Debian 5.5.0-3) 5.4.1 20171010
reproduce:
        git checkout c56190faa27f4efe2a4b246e67be207c120cfe07
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   fs//overlayfs/file.c: In function 'ovl_open_realfile':
>> fs//overlayfs/file.c:20:23: error: 'sb' undeclared (first use in this function)
     struct ovl_fs *ofs = sb->s_fs_info;
                          ^
   fs//overlayfs/file.c:20:23: note: each undeclared identifier is reported only once for each function it appears in

vim +/sb +20 fs//overlayfs/file.c

    13	
    14	static struct file *ovl_open_realfile(const struct file *file)
    15	{
    16		struct inode *inode = file_inode(file);
    17		struct inode *upperinode = ovl_inode_upper(inode);
    18		struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
    19		struct file *realfile;
  > 20		struct ovl_fs *ofs = sb->s_fs_info;
    21	
    22		realfile = open_with_fake_path(&file->f_path, file->f_flags | O_NOATIME,
    23				     realinode, ofs->creator_cred);
    24	
    25		pr_debug("open(%p[%pD2/%c], 0%o) -> (%p, 0%o)\n",
    26			 file, file, upperinode ? 'u' : 'l', file->f_flags,
    27			 realfile, IS_ERR(realfile) ? 0 : realfile->f_flags);
    28	
    29		return realfile;
    30	}
    31	

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