On Wed, 18 Aug 2010 18:01:37 -0700 "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx> wrote: > BSG exposes more raw functionality (but certaily not all) of the modern > Linux Block layer code. This includes the ability to do BIDI commands > and support for legacy SG_IO ioctls in block/bsg.c:bsg_ioctl(). > > Note that not all of the the structure members in struct sg_io_v4 can > safely be used with current mainline code. For example, having a 32-bit > userspace passing up 32-bit pointers currently need a patch to require > proper conversion to 64-bit struct scatterlist memory. The first half > of this patch is here: > > http://groups.google.com/group/linux-iscsi-target-dev/browse_thread/thread/6b9f8a08f78067dc/6330a5897203854a?lnk=gst&q=BSG#6330a5897203854a > > This issue came up again between Tomo-san and myself last week, and we > agreed that the patch to make 32-bit user + 64-bit kernel work with BSG > scatterlists would not be pretty, Sorry, we agreed about it? I'm not sure about. I really want to avoid the compat code for bsg read/write interface. I just want to say, bsg doesn't support such configuration and use 64-bit user space. > but that it does need to be fixed in > order to properly support the QEMU-KVM SCSI-BSG MegaSAS SGL passthrough. > This is the code that has been being going in parallel with the recent > multi-fabric TCM_Loop Virtual SCSI LLD develpments for STGT, which can > be found here to give more of an idea how BSG functions. -- To unsubscribe from this list: send the line "unsubscribe stgt" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
