linux-kernel - Re: [PATCH v2] ovl: provide real_file() and overlayfs get_unmapped

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Message-ID: <365d83b8-3af7-2113-3a20-2aed51d9de91@oracle.com>
Date:   Thu, 28 May 2020 14:01:26 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     kbuild test robot <lkp@...el.com>,
        Miklos Szeredi <miklos@...redi.hu>
Cc:     kbuild-all@...ts.01.org, Colin Walters <walters@...bum.org>,
        syzbot <syzbot+d6ec23007e951dadf3de@...kaller.appspotmail.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-unionfs@...r.kernel.org
Subject: Re: [PATCH v2] ovl: provide real_file() and overlayfs
 get_unmapped_area()

On 5/28/20 1:37 AM, kbuild test robot wrote:
> Hi Mike,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on miklos-vfs/overlayfs-next]
> [also build test ERROR on linus/master v5.7-rc7]
> [cannot apply to linux/master next-20200526]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
> 
> url:    https://github.com/0day-ci/linux/commits/Mike-Kravetz/ovl-provide-real_file-and-overlayfs-get_unmapped_area/20200528-080533
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs.git overlayfs-next
> config: h8300-randconfig-r036-20200528 (attached as .config)
> compiler: h8300-linux-gcc (GCC) 9.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
> 
> All error/warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> fs/overlayfs/file.c: In function 'ovl_get_unmapped_area':
>>> fs/overlayfs/file.c:768:14: error: 'struct mm_struct' has no member named 'get_unmapped_area'
> 768 |   current->mm->get_unmapped_area)(realfile,
> |              ^~
>>> fs/overlayfs/file.c:770:1: warning: control reaches end of non-void function [-Wreturn-type]
> 770 | }
> | ^
> 
> vim +768 fs/overlayfs/file.c
> 
>    760	
>    761	static unsigned long ovl_get_unmapped_area(struct file *file,
>    762					unsigned long uaddr, unsigned long len,
>    763					unsigned long pgoff, unsigned long flags)
>    764	{
>    765		struct file *realfile = real_file(file);
>    766	
>    767		return (realfile->f_op->get_unmapped_area ?:
>  > 768			current->mm->get_unmapped_area)(realfile,
>    769							uaddr, len, pgoff, flags);
>  > 770	}
>    771	
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
> 

Well yuck!  get_unmapped_area is not part of mm_struct if !CONFIG_MMU.

Miklos, would adding '#ifdef CONFIG_MMU' around the overlayfs code be too
ugly for you?  Another option is to use real_file() in the mmap code as
done in [1].

Sorry for all the questions.  However, I want to make sure you are happy
with any overlayfs changes.

[1] https://lore.kernel.org/linux-mm/04a00e3b-539c-236f-e43b-0024ef94b7cb@oracle.com/
-- 
Mike Kravetz