tree a083b47153c0a53afb12e1163c92f2b2ebe741b7
parent 87a816df537e096d404add543ef47b796906c130
author Sagi Grimberg <sagig@mellanox.com> 1441297703 +0300
committer Jens Axboe <axboe@fb.com> 1441983830 -0600

block: Copy a user iovec if it includes gaps

For drivers that don't support gaps in the SG lists handed to
them we must bounce (copy the user buffers) and pass a bio that
does not include gaps. This doesn't matter for any current user,
but will help to allow iser which can't handle gaps to use the
block virtual boundary instead of using driver-local bounce
buffering when handling SG_IO commands.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>