Re: [PATCH] block: make sure big bio is splitted into at most 256 bvecs

[Kent Overstreet]

On Wed, Apr 06, 2016 at 01:44:06AM +0800, Ming Lei wrote:
> After arbitrary bio size is supported, the incoming bio may
> be very big. We have to split the bio into small bios so that
> each holds at most BIO_MAX_PAGES bvecs for safety reason, such
> as bio_clone().
> 
> This patch fixes the following kernel crash:

Ming, let's not do it this way; drivers that don't clone biovecs are the norm -
instead, md has its own queue limits that it ought to be setting up correctly.