[PATCH] blk: add vector gaps queue parameter

[Christoph Hellwig]

On Thu, Jul 30, 2015 at 12:04:19PM +0300, Sagi Grimberg wrote:
> I wander if its better to default to PAGE_SIZE to not change the
> existing functionality? Or do we want to force drivers to set virt_mask?

I'd say we should remove the SG_GAPS flag (which is horribly misnamed
anyway) and just have this field.  0 means we don't need to check at
all, and any actual value checks for that value.