Re: [RFC PATCH 2/2] dm: don't try to split REQ_OP_ZONE_APPEND bios

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On 2020/06/19 15:59, Johannes Thumshirn wrote:
> REQ_OP_ZONE_APPEND bios cannot be split so return EIO if we can't fit it
> into one IO.
> 
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
> ---
>  drivers/md/dm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> index 058c34abe9d1..c720a7e3269a 100644
> --- a/drivers/md/dm.c
> +++ b/drivers/md/dm.c
> @@ -1609,6 +1609,9 @@ static int __split_and_process_non_flush(struct clone_info *ci)
>  
>  	len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count);
>  
> +	if (bio_op(ci->bio) == REQ_OP_ZONE_APPEND && len < ci->sector_count)
> +		return -EIO;
> +
>  	r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
>  	if (r < 0)
>  		return r;
> 

I think this is OK. The stacked max_zone_append_sectors limit should have
prevented that to happen  in the first place I think, but better safe than sorry.

Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>

-- 
Damien Le Moal
Western Digital Research




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