Add specialized block driver scsi generic API (Avi Kivity)
When a scsi device is backed by a scsi generic device instead of an
ordinary host block device, the block API is abused in a couple of annoying
ways:
- nb_sectors is negative, and specifies a byte count instead of a sector count
- offset is ignored, since scsi-generic is essentially a packet protocol
This overloading makes hacking the block layer difficult. Remove it by
introducing a new explicit API for scsi-generic devices. The new API
is still backed by the old implementation, but at least the users are
insulated.
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6822 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/block.c b/block.c
index 1ef4ae5..39b27b2 100644
--- a/block.c
+++ b/block.c
@@ -1675,3 +1675,25 @@
return drv->bdrv_ioctl(bs, req, buf);
return -ENOTSUP;
}
+
+int bdrv_sg_send_command(BlockDriverState *bs, void *buf, int count)
+{
+ return bdrv_pwrite(bs, -1, buf, count);
+}
+
+int bdrv_sg_recv_response(BlockDriverState *bs, void *buf, int count)
+{
+ return bdrv_pread(bs, -1, buf, count);
+}
+
+BlockDriverAIOCB *bdrv_sg_aio_read(BlockDriverState *bs, void *buf, int count,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ return bdrv_aio_read(bs, 0, buf, -(int64_t)count, cb, opaque);
+}
+
+BlockDriverAIOCB *bdrv_sg_aio_write(BlockDriverState *bs, void *buf, int count,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ return bdrv_aio_write(bs, 0, buf, -(int64_t)count, cb, opaque);
+}
