Re: [dm-devel] [PATCH v5 01/11] block: make generic_make_request handle arbitrarily sized bios

From: Christoph Hellwig
Date: Sun Aug 09 2015 - 02:42:00 EST

On Sat, Aug 08, 2015 at 10:59:50PM -0700, Ming Lin wrote:
> +/*
> + * Ensure that max discard sectors doesn't overflow bi_size and hopefully
> + * it is of the proper granularity as long as the granularity is a power
> + * of two.
> + */
> +#define MAX_DISCARD_SECTORS ((1U << 31) >> 9)

Thisn't isn't MAX_DISCARD_SECTORS, it's MAX_BIO_SECTORS. If we ever
to something like Kent's multipage biovecs we'll actually need it for
regular read/write bios in addition to discard and write same.

Except for that the patch looks reasonable to me.
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