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new scsi-generic abstraction, use SG_IO (Christoph Hellwig)

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Okay, I started looking into how to handle scsi-generic I/O in the
new world order.

I think the best is to use the SG_IO ioctl instead of the read/write
interface as that allows us to support scsi passthrough on disk/cdrom
devices, too.  See Hannes patch on the kvm list from August for an
example.

Now that we always do ioctls we don't need another abstraction than
bdrv_ioctl for the synchronous requests for now, and for asynchronous
requests I've added a aio_ioctl abstraction keeping it simple.

Long-term we might want to move the ops to a higher-level abstraction
and let the low-level code fill out the request header, but I'm lazy
enough to leave that to the people trying to support scsi-passthrough
on a non-Linux OS.

Tested lightly by issuing various sg_ commands from sg3-utils in a guest
to a host CDROM device.


Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6895 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-03-28 17:28:41 +00:00
parent 64a7fde8e8
commit 221f715d90
7 changed files with 117 additions and 139 deletions
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13
block_int.h
View file

@ -86,16 +86,9 @@ struct BlockDriver {
/* to control generic scsi devices */
int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
int (*bdrv_sg_send_command)(BlockDriverState *bs, void *buf, int count);
int (*bdrv_sg_recv_response)(BlockDriverState *bs, void *buf, int count);
BlockDriverAIOCB *(*bdrv_sg_aio_read)(BlockDriverState *bs,
void *buf, int count,
BlockDriverCompletionFunc *cb,
void *opaque);
BlockDriverAIOCB *(*bdrv_sg_aio_write)(BlockDriverState *bs,
void *buf, int count,
BlockDriverCompletionFunc *cb,
void *opaque);
BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
unsigned long int req, void *buf,
BlockDriverCompletionFunc *cb, void *opaque);
AIOPool aio_pool;
struct BlockDriver *next;