linux-kernel - Re: [PATCH v3 06/20] dax: set errors in mapping when writeback fails

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Date:   Mon, 24 Apr 2017 13:16:04 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
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 06/20] dax: set errors in mapping when writeback fails

On Mon, Apr 24, 2017 at 09:22:45AM -0400, Jeff Layton wrote:
> In order to get proper error codes from fsync, we must set an error in
> the mapping range when writeback fails.
> 
> Signed-off-by: Jeff Layton <jlayton@...hat.com>

Works fine in some error injection testing.

Tested-by: Ross Zwisler <ross.zwisler@...ux.intel.com>

> ---
>  fs/dax.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/dax.c b/fs/dax.c
> index 85abd741253d..9b6b04030c3f 100644
> --- a/fs/dax.c
> +++ b/fs/dax.c
> @@ -901,8 +901,10 @@ int dax_writeback_mapping_range(struct address_space *mapping,
>  
>  			ret = dax_writeback_one(bdev, mapping, indices[i],
>  					pvec.pages[i]);
> -			if (ret < 0)
> +			if (ret < 0) {
> +				mapping_set_error(mapping, ret);
>  				return ret;
> +			}
>  		}
>  	}
>  	return 0;
> -- 
> 2.9.3
>