linux-kernel - RE: [f2fs-dev] [PATCH] f2fs: fix to release inode page in get_new_data

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Date:	Sat, 11 Jul 2015 10:02:51 +0800
From:	Chao Yu <yuchaochina@...mail.com>
To:	"'Jaegeuk Kim'" <jaegeuk@...nel.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-f2fs-devel@...ts.sourceforge.net>
Subject: RE: [f2fs-dev] [PATCH] f2fs: fix to release inode page in	get_new_data_page

Hi Jaegeuk,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> Sent: Saturday, July 11, 2015 8:17 AM
> To: Chao Yu; Chao Yu
> Cc: linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net;
> linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net
> Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to release inode page in get_new_data_page
> 
> Hi Chao,
> 
> On Thu, Jul 09, 2015 at 06:20:08PM +0800, Chao Yu wrote:
> > get_new_data_page should release inode page when we encounter any
> > error in its procedure, but there is one error path didn't cover
> > this, fix it.
> 
> Nice catch.
> But, I think we should fix its caller:
> 
> in init_inode_metadata(),
> 	err = make_empty_dir();
> 	if (err)
> 		goto put_error;
> 		---------------

Previously, I fixed in the same way, but I got an oops when I test the
patch with xfstest suit, it shows we will meet an error in this call
path IIRC:

->f2fs_mkdir
  ->__f2fs_add_link
    ->init_inode_metadata
      ->make_empty_dir
        ->get_new_data_page
          ->f2fs_reserve_block
            ->reserve_new_block
              ->inc_valid_block_count
                return -ENOSPC;
              ->f2fs_put_dnode
                ->f2fs_put_page(ipage, 1)

      put_error:
        ->f2fs_put_page(ipage, 1);
          f2fs_bug_on(F2FS_P_SB(page), !PageLocked(page));

And I don't think we should change error handling method of f2fs_put_dnode
for just fixing this issue.

How do you think?

Thanks,

> Thanks,
> 
> >
> > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > ---
> >  fs/f2fs/data.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index 08dfdc6..ea8898b 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -397,8 +397,10 @@ struct page *get_new_data_page(struct inode *inode,
> >  	int err;
> >  repeat:
> >  	page = grab_cache_page(mapping, index);
> > -	if (!page)
> > +	if (!page) {
> > +		f2fs_put_page(ipage, 1);
> >  		return ERR_PTR(-ENOMEM);
> > +	}
> >
> >  	set_new_dnode(&dn, inode, ipage, NULL, 0);
> >  	err = f2fs_reserve_block(&dn, index);
> > --
> > 2.4.2
> 
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