linux-kernel - Re: [f2fs-dev] [PATCH 2/2] f2fs: handle error cases in commit_inmem

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Message-ID: <20150804183753.GB69437@jaegeuk-mac02.hsd1.ca.comcast.net>
Date:	Tue, 4 Aug 2015 11:37:53 -0700
From:	Jaegeuk Kim <jaegeuk@...nel.org>
To:	Chao Yu <chao2.yu@...sung.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: handle error cases in
 commit_inmem_pages

On Wed, Jul 29, 2015 at 05:32:00PM +0800, Chao Yu wrote:
> Hi Jaegeuk,
> 
> > -----Original Message-----
> > From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> > Sent: Tuesday, July 28, 2015 11:57 PM
> > To: Chao Yu
> > Cc: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> > linux-f2fs-devel@...ts.sourceforge.net
> > Subject: Re: [f2fs-dev] [PATCH 2/2] f2fs: handle error cases in commit_inmem_pages
> > 
> > On Tue, Jul 28, 2015 at 06:25:26PM +0800, Chao Yu wrote:
> > > Hi Jaegeuk,
> > >
> > > > -----Original Message-----
> > > > From: Jaegeuk Kim [mailto:jaegeuk@...nel.org]
> > > > Sent: Sunday, July 26, 2015 8:21 AM
> > > > To: linux-kernel@...r.kernel.org; linux-fsdevel@...r.kernel.org;
> > > > linux-f2fs-devel@...ts.sourceforge.net
> > > > Cc: Jaegeuk Kim
> > > > Subject: [f2fs-dev] [PATCH 2/2] f2fs: handle error cases in commit_inmem_pages
> > > >
> > > > This patch adds to handle error cases in commit_inmem_pages.
> > > > If an error occurs, it stops to write the pages and return the error right
> > > > away.
> > > >
> > > > Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
> > > > ---
> > > >  fs/f2fs/f2fs.h    |  2 +-
> > > >  fs/f2fs/file.c    |  6 ++++--
> > > >  fs/f2fs/segment.c | 10 ++++++++--
> > > >  3 files changed, 13 insertions(+), 5 deletions(-)
> > > >
> > > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> > > > index e73f2e2..58b05b5 100644
> > > > --- a/fs/f2fs/f2fs.h
> > > > +++ b/fs/f2fs/f2fs.h
> > > > @@ -1697,7 +1697,7 @@ void destroy_node_manager_caches(void);
> > > >   * segment.c
> > > >   */
> > > >  void register_inmem_page(struct inode *, struct page *);
> > > > -void commit_inmem_pages(struct inode *, bool);
> > > > +int commit_inmem_pages(struct inode *, bool);
> > > >  void f2fs_balance_fs(struct f2fs_sb_info *);
> > > >  void f2fs_balance_fs_bg(struct f2fs_sb_info *);
> > > >  int f2fs_issue_flush(struct f2fs_sb_info *);
> > > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> > > > index 25d1a2f..a2b3656 100644
> > > > --- a/fs/f2fs/file.c
> > > > +++ b/fs/f2fs/file.c
> > > > @@ -1358,7 +1358,9 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
> > > >
> > > >  	if (f2fs_is_atomic_file(inode)) {
> > > >  		clear_inode_flag(F2FS_I(inode), FI_ATOMIC_FILE);
> > > > -		commit_inmem_pages(inode, false);
> > > > +		ret = commit_inmem_pages(inode, false);
> > > > +		if (ret)
> > > > +			return ret;
> 
> It looks we forget to call mnt_drop_write_file before return.

Oh, yes. :)
I fixed that.
Thanks,

> 
> [snip]
> 
> > This entry is not removed from the list.
> > So, after failure, the abort path will put the page and remove it from the list.
> 
> Oh, you're right, thanks for your explanation! :)
> 
> Thanks,
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