linux-kernel - Re: [PATCH v3 11/20] cifs: set mapping error when page writeback fails in writepage or launder

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Message-ID: <1493054187.2895.18.camel@redhat.com>
Date:   Mon, 24 Apr 2017 13:16:27 -0400
From:   Jeff Layton <jlayton@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-cifs@...r.kernel.org, linux-mm@...ck.org,
        jfs-discussion@...ts.sourceforge.net, linux-xfs@...r.kernel.org,
        cluster-devel@...hat.com, linux-f2fs-devel@...ts.sourceforge.net,
        v9fs-developer@...ts.sourceforge.net, osd-dev@...n-osd.org,
        linux-nilfs@...r.kernel.org, linux-block@...r.kernel.org,
        dhowells@...hat.com, akpm@...ux-foundation.org,
        ross.zwisler@...ux.intel.com, mawilcox@...rosoft.com,
        jack@...e.com, viro@...iv.linux.org.uk, corbet@....net,
        neilb@...e.de, clm@...com, tytso@....edu, axboe@...nel.dk
Subject: Re: [PATCH v3 11/20] cifs: set mapping error when page writeback
 fails in writepage or launder_pages

On Mon, 2017-04-24 at 08:27 -0700, Christoph Hellwig wrote:
> On Mon, Apr 24, 2017 at 09:22:50AM -0400, Jeff Layton wrote:
> > Signed-off-by: Jeff Layton <jlayton@...hat.com>
> > ---
> >  fs/cifs/file.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> > index 21d404535739..4b696a23b0b1 100644
> > --- a/fs/cifs/file.c
> > +++ b/fs/cifs/file.c
> > @@ -2234,14 +2234,16 @@ cifs_writepage_locked(struct page *page, struct writeback_control *wbc)
> >  	set_page_writeback(page);
> >  retry_write:
> >  	rc = cifs_partialpagewrite(page, 0, PAGE_SIZE);
> > +	if (rc == -EAGAIN && wbc->sync_mode == WB_SYNC_ALL) {
> >  		goto retry_write;
> > +	} else if (rc == -EAGAIN) {
> >  		redirty_page_for_writepage(wbc, page);
> > +	} else if (rc != 0) {
> >  		SetPageError(page);
> > +		mapping_set_error(page->mapping, rc);
> > +	} else {
> >  		SetPageUptodate(page);
> > +	}
> 
> Hmmm.  I might be a little too nitpicky, but I hate having the same
> partial condition duplicated if possible.  Why not:
> 
> 	if (rc == -EAGAIN) {
> 		if (wbc->sync_mode == WB_SYNC_ALL)
> 			goto retry_write;
> 		redirty_page_for_writepage(wbc, page);
> 	} else if (rc) {
> 		SetPageError(page);
> 		mapping_set_error(page->mapping, rc);
> 	} else {
> 		SetPageUptodate(page);
> 	}
> 
> Otherwise this looks fine to me:
> 
> Reviewed-by: Christoph Hellwig <hch@....de>

No, you're absolutely right. I merged that change into the patch.

Thanks for the review so far!
-- 
Jeff Layton <jlayton@...hat.com>