Message-ID: <1501107773.15159.6.camel@redhat.com>
Subject: Re: [PATCH v2 4/4] gfs2: convert to errseq_t based writeback error
 reporting for fsync
From: Jeff Layton <jlayton@redhat.com>
To: Matthew Wilcox <willy@infradead.org>, Jeff Layton <jlayton@kernel.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>, Jan Kara <jack@suse.cz>,
        "J . Bruce Fields" <bfields@fieldses.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, Bob Peterson <rpeterso@redhat.com>,
        Steven Whitehouse <swhiteho@redhat.com>, cluster-devel@redhat.com
Date: Wed, 26 Jul 2017 18:22:53 -0400
In-Reply-To: <20170726192105.GD15980@bombadil.infradead.org>
References: <20170726175538.13885-1-jlayton@kernel.org>
         <20170726175538.13885-5-jlayton@kernel.org>
         <20170726192105.GD15980@bombadil.infradead.org>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1155
Lines: 37

On Wed, 2017-07-26 at 12:21 -0700, Matthew Wilcox wrote:
> On Wed, Jul 26, 2017 at 01:55:38PM -0400, Jeff Layton wrote:
> > @@ -668,12 +668,14 @@ static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
> >  		if (ret)
> >  			return ret;
> >  		if (gfs2_is_jdata(ip))
> > -			filemap_write_and_wait(mapping);
> > +			ret = file_write_and_wait(file);
> > +		if (ret)
> > +			return ret;
> >  		gfs2_ail_flush(ip->i_gl, 1);
> >  	}
> 
> Do we want to skip flushing the AIL if there was an error (possibly
> previously encountered)?  I'd think we'd want to flush the AIL then report
> the error, like this:
> 

I wondered about that. Note that earlier in the function, we also bail
out without flushing the AIL if sync_inode_metadata fails, so I assumed
that we'd want to do the same here. 

I could definitely be wrong and am fine with changing it if so.
Discarding the error like we do today seems wrong though.

Bob, thoughts?


>  		if (gfs2_is_jdata(ip))
> -			filemap_write_and_wait(mapping);
> +			ret = file_write_and_wait(file);
>  		gfs2_ail_flush(ip->i_gl, 1);
> +		if (ret)
> +			return ret;
>  	}
-- 
Jeff Layton <jlayton@redhat.com>