[PATCH 1/3] block: copy multi iovec user mappings if QUEUE_FLAG_SG_GAPS is set

[Christoph Hellwig]

On Thu, Jul 16, 2015 at 10:49:54AM -0600, Jens Axboe wrote:
> SG_GAPS is a bit of a misnomer, but it's not easy to explain exactly what 
> that logic is in a few short words! SG gaps was the closest I could come up 
> with.

SG_NO_OFFSETS_INTO_TRAILING_PAGES would desscribe it, but is a little too
long..