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virtio-blk: Check return value of blk_aio_ioctl 

Since commit 1dc936aa84 (virtio-blk: Use blk_aio_ioctl) we silently lose
the request if blk_aio_ioctl returns NULL (not implemented).

Fix it by directly returning VIRTIO_BLK_S_UNSUPP as we used to do.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

[ kwolf: Fixed build error on win32 ]

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2015-02-17 17:55:53 +08:00 committed by Kevin Wolf
parent 20a1f9d071
commit a209f4615c
1 changed files with 8 additions and 2 deletions
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10
hw/block/virtio-blk.c
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@ -201,6 +201,7 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
#ifdef __linux__
int i;
VirtIOBlockIoctlReq *ioctl_req;
BlockAIOCB *acb;
#endif
/*
@ -278,8 +279,13 @@ static int virtio_blk_handle_scsi_req(VirtIOBlockReq *req)
ioctl_req->hdr.sbp = elem->in_sg[elem->in_num - 3].iov_base;
ioctl_req->hdr.mx_sb_len = elem->in_sg[elem->in_num - 3].iov_len;
blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
virtio_blk_ioctl_complete, ioctl_req);
acb = blk_aio_ioctl(blk->blk, SG_IO, &ioctl_req->hdr,
virtio_blk_ioctl_complete, ioctl_req);
if (!acb) {
g_free(ioctl_req);
status = VIRTIO_BLK_S_UNSUPP;
goto fail;
}
return -EINPROGRESS;
#else
abort();