Re: [PATCH v1 2/6] fs: use on-stack-bio if backing device has BDI_CAP_SYNC capability

[Matthew Wilcox]

On Tue, Aug 08, 2017 at 05:49:59AM -0700, Matthew Wilcox wrote:
> +	struct bio sbio;
> +	struct bio_vec sbvec;

... this needs to be sbvec[nr_pages], of course.

> -		bio = mpage_alloc(bdev, blocks[0] << (blkbits - 9),
> +		if (bdi_cap_synchronous_io(inode_to_bdi(inode))) {
> +			bio = &sbio;
> +			bio_init(bio, &sbvec, nr_pages);

... and this needs to be 'sbvec', not '&sbvec'.