linux-kernel - Re: [PATCH 11/27] bcache: io.c: use bio_set_vec

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Date:	Tue, 5 Apr 2016 05:49:02 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Shaohua Li <shli@...nel.org>,
	"open list:BCACHE (BLOCK LAYER CACHE)" <linux-bcache@...r.kernel.org>,
	"open list:SOFTWARE RAID (Multiple Disks) SUPPORT" 
	<linux-raid@...r.kernel.org>
Subject: Re: [PATCH 11/27] bcache: io.c: use bio_set_vec_table

On Tue, Apr 05, 2016 at 07:56:56PM +0800, Ming Lei wrote:
> diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
> index 86a0bb8..1c48462 100644
> --- a/drivers/md/bcache/io.c
> +++ b/drivers/md/bcache/io.c
> @@ -26,8 +26,7 @@ struct bio *bch_bbio_alloc(struct cache_set *c)
>  
>  	bio_init(bio);
>  	bio->bi_flags		|= BIO_POOL_NONE << BIO_POOL_OFFSET;
> -	bio->bi_max_vecs	 = bucket_pages(c);
> -	bio->bi_io_vec		 = bio->bi_inline_vecs;
> +	bio_set_vec_table(bio, bio->bi_inline_vecs, bucket_pages(c));

All this bcache code needs to move away from bio_init on a bio
embedded in a driver private structure toward properly using
bio_alloc / bio_alloc_bioset.  That will also fix the crash
with bcache over md that Shaohua reported, so I'd suggest to fast
track this part of the series.