From 7d78066926b68afe28a1948c64618ee085d9ab02 Mon Sep 17 00:00:00 2001 From: aliguori Date: Thu, 12 Mar 2009 19:57:08 +0000 Subject: 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 Signed-off-by: Anthony Liguori git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6822 c046a42c-6fe2-441c-8c8c-71466251a162 --- block.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'block.c') diff --git a/block.c b/block.c index 1ef4ae5f3e..39b27b2702 100644 --- a/block.c +++ b/block.c @@ -1675,3 +1675,25 @@ int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) 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); +} -- cgit v1.2.3