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

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Date:   Mon, 24 Apr 2017 08:27:08 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jeff Layton <jlayton@...hat.com>
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, hch@...radead.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, 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>