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

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Date:	Mon, 13 Jul 2015 16:25:57 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <yuchaochina@...mail.com>
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 Chao,

On Sat, Jul 11, 2015 at 10:02:51AM +0800, Chao Yu wrote:
> 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?

Indeed. I cannot think about other clean way for now.
Instead, how about adding this description in the patch and some comments in
the codes?

Thanks,
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