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

[Shaohua Li]

On Tue, Apr 05, 2016 at 04:36:04PM -0800, Kent Overstreet wrote:
> On Tue, Apr 05, 2016 at 05:30:07PM -0700, Shaohua Li wrote:
> > this one:
> > http://marc.info/?l=linux-kernel&m=145926976808760&w=2
> 
> Ah. that patch won't actually fix the bug, since md isn't using
> blk_default_limits, it's using blk_set_stacking_limits().

Not really, the limit is set by under layer disk not md, otherwise it
should be BLK_SAFE_MAX_SECTORS, but the reported bio has 2560 sectors.
blk_set_stacking_limits() will use it.