Re: linux-next: manual merge of the block tree with the xfs tree

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On 2 Sep 2015, at 03:16, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> wrote:

> Hi Jens,
> 
> Today's linux-next merge of the block tree got a conflict in:
> 
>  fs/xfs/xfs_aops.c
> 
> between commit:
> 
>  c9eb256eda44 ("xfs: return errors from partial I/O failures to files")
> 
> from the xfs tree and commit:
> 
>  4246a0b63bd8 ("block: add a bi_error field to struct bio")
> 
> from the block tree.
> 
> I fixed it up (I think - see below) and can carry the fix as necessary
> (no action is required).
> 
> -- 
> Cheers,
> Stephen Rothwell                    sfr@xxxxxxxxxxxxxxxx
> 
> diff --cc fs/xfs/xfs_aops.c
> index c8637073ef25,c77499bcbd7a..000000000000
> --- a/fs/xfs/xfs_aops.c
> +++ b/fs/xfs/xfs_aops.c
> @@@ -354,8 -355,7 +353,8 @@@ xfs_end_bio
>  {
>  	xfs_ioend_t		*ioend = bio->bi_private;
> 
> - 	if (!ioend->io_error && !test_bit(BIO_UPTODATE, &bio->bi_flags))
> - 		ioend->io_error = error;
> -	ioend->io_error = bio->bi_error;
> ++	if (!ioend->io_error)
> ++		ioend->io_error = bio->bi_error;
> 
>  	/* Toss bio and pass work off to an xfsdatad thread */
>  	bio->bi_private = NULL;
> 
> 

This is incorrect; it can clear an earlier error status. It should probably read:

 	if (!ioend->io_error && bio->bi_error)
 		ioend->io_error = bio->bi_error;

—
Roger

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