61 MODULE_PARM_DESC(shared_backend, "Enable the shared backend between virtio-blk devices");
67 static void vdpasim_blk_buffer_lock(struct vdpasim_blk *blk)  in vdpasim_blk_buffer_lock()  argument
69 	if (blk->shared_backend)  in vdpasim_blk_buffer_lock()
73 static void vdpasim_blk_buffer_unlock(struct vdpasim_blk *blk)  in vdpasim_blk_buffer_unlock()  argument
75 	if (blk->shared_backend)  in vdpasim_blk_buffer_unlock()
112 	struct vdpasim_blk *blk = sim_to_blk(vdpasim);  in vdpasim_blk_handle_req()  local
178 		vdpasim_blk_buffer_lock(blk);  in vdpasim_blk_handle_req()
180 					      blk->buffer + offset, to_push);  in vdpasim_blk_handle_req()
181 		vdpasim_blk_buffer_unlock(blk);  in vdpasim_blk_handle_req()
201 		vdpasim_blk_buffer_lock(blk);  in vdpasim_blk_handle_req()
203 					      blk->buffer + offset, to_pull);  in vdpasim_blk_handle_req()
204 		vdpasim_blk_buffer_unlock(blk);  in vdpasim_blk_handle_req()
284 			vdpasim_blk_buffer_lock(blk);  in vdpasim_blk_handle_req()
285 			memset(blk->buffer + offset, 0,  in vdpasim_blk_handle_req()
287 			vdpasim_blk_buffer_unlock(blk);  in vdpasim_blk_handle_req()
394 	struct vdpasim_blk *blk = sim_to_blk(vdpasim);  in vdpasim_blk_free()  local
396 	if (!blk->shared_backend)  in vdpasim_blk_free()
397 		kvfree(blk->buffer);  in vdpasim_blk_free()
413 	struct vdpasim_blk *blk;  in vdpasim_blk_dev_add()  local
434 	blk = sim_to_blk(simdev);  in vdpasim_blk_dev_add()
435 	blk->shared_backend = shared_backend;  in vdpasim_blk_dev_add()
437 	if (blk->shared_backend) {  in vdpasim_blk_dev_add()
438 		blk->buffer = shared_buffer;  in vdpasim_blk_dev_add()
440 		blk->buffer = kvzalloc(VDPASIM_BLK_CAPACITY << SECTOR_SHIFT,  in vdpasim_blk_dev_add()
442 		if (!blk->buffer) {  in vdpasim_blk_dev_add()