87 	int err;  in xen_update_blkif_status()  local
103 	err = blkback_name(blkif, name);  in xen_update_blkif_status()
104 	if (err) {  in xen_update_blkif_status()
105 		xenbus_dev_error(blkif->be->dev, err, "get blkback dev name");  in xen_update_blkif_status()
109 	err = filemap_write_and_wait(blkif->vbd.bdev->bd_inode->i_mapping);  in xen_update_blkif_status()
110 	if (err) {  in xen_update_blkif_status()
111 		xenbus_dev_error(blkif->be->dev, err, "block flush");  in xen_update_blkif_status()
118 		err = PTR_ERR(blkif->xenblkd);  in xen_update_blkif_status()
120 		xenbus_dev_error(blkif->be->dev, err, "start xenblkd");  in xen_update_blkif_status()
163 	int err;  in xen_blkif_map()  local
169 	err = xenbus_map_ring_valloc(blkif->be->dev, gref, nr_grefs,  in xen_blkif_map()
171 	if (err < 0)  in xen_blkif_map()
172 		return err;  in xen_blkif_map()
203 	err = bind_interdomain_evtchn_to_irqhandler(blkif->domid, evtchn,  in xen_blkif_map()
206 	if (err < 0) {  in xen_blkif_map()
209 		return err;  in xen_blkif_map()
211 	blkif->irq = err;  in xen_blkif_map()
457 	int err;  in xen_blkbk_flush_diskcache()  local
459 	err = xenbus_printf(xbt, dev->nodename, "feature-flush-cache",  in xen_blkbk_flush_diskcache()
461 	if (err)  in xen_blkbk_flush_diskcache()
462 		dev_warn(&dev->dev, "writing feature-flush-cache (%d)", err);  in xen_blkbk_flush_diskcache()
464 	return err;  in xen_blkbk_flush_diskcache()
471 	int err;  in xen_blkbk_discard()  local
476 	err = xenbus_scanf(XBT_NIL, dev->nodename, "discard-enable", "%d",  in xen_blkbk_discard()
478 	if (err == 1 && !discard_enable)  in xen_blkbk_discard()
482 		err = xenbus_printf(xbt, dev->nodename,  in xen_blkbk_discard()
485 		if (err) {  in xen_blkbk_discard()
486 			dev_warn(&dev->dev, "writing discard-granularity (%d)", err);  in xen_blkbk_discard()
489 		err = xenbus_printf(xbt, dev->nodename,  in xen_blkbk_discard()
492 		if (err) {  in xen_blkbk_discard()
493 			dev_warn(&dev->dev, "writing discard-alignment (%d)", err);  in xen_blkbk_discard()
498 		err = xenbus_printf(xbt, dev->nodename,  in xen_blkbk_discard()
501 		if (err) {  in xen_blkbk_discard()
502 			dev_warn(&dev->dev, "writing discard-secure (%d)", err);  in xen_blkbk_discard()
506 	err = xenbus_printf(xbt, dev->nodename, "feature-discard",  in xen_blkbk_discard()
508 	if (err)  in xen_blkbk_discard()
509 		dev_warn(&dev->dev, "writing feature-discard (%d)", err);  in xen_blkbk_discard()
515 	int err;  in xen_blkbk_barrier()  local
517 	err = xenbus_printf(xbt, dev->nodename, "feature-barrier",  in xen_blkbk_barrier()
519 	if (err)  in xen_blkbk_barrier()
520 		dev_warn(&dev->dev, "writing feature-barrier (%d)", err);  in xen_blkbk_barrier()
522 	return err;  in xen_blkbk_barrier()
533 	int err;  in xen_blkbk_probe()  local
550 		err = PTR_ERR(be->blkif);  in xen_blkbk_probe()
552 		xenbus_dev_fatal(dev, err, "creating block interface");  in xen_blkbk_probe()
559 	err = xenbus_watch_pathfmt(dev, &be->backend_watch, backend_changed,  in xen_blkbk_probe()
561 	if (err)  in xen_blkbk_probe()
564 	err = xenbus_printf(XBT_NIL, dev->nodename, "max-ring-page-order", "%u",  in xen_blkbk_probe()
566 	if (err)  in xen_blkbk_probe()
569 	err = xenbus_switch_state(dev, XenbusStateInitWait);  in xen_blkbk_probe()
570 	if (err)  in xen_blkbk_probe()
578 	return err;  in xen_blkbk_probe()
590 	int err;  in backend_changed()  local
602 	err = xenbus_scanf(XBT_NIL, dev->nodename, "physical-device", "%x:%x",  in backend_changed()
604 	if (XENBUS_EXIST_ERR(err)) {  in backend_changed()
612 	if (err != 2) {  in backend_changed()
613 		xenbus_dev_fatal(dev, err, "reading physical-device");  in backend_changed()
626 		err = PTR_ERR(be->mode);  in backend_changed()
628 		xenbus_dev_fatal(dev, err, "reading mode");  in backend_changed()
639 	err = kstrtoul(strrchr(dev->otherend, '/') + 1, 0, &handle);  in backend_changed()
640 	if (err)  in backend_changed()
646 	err = xen_vbd_create(be->blkif, handle, major, minor,  in backend_changed()
649 	if (err)  in backend_changed()
650 		xenbus_dev_fatal(dev, err, "creating vbd structure");  in backend_changed()
652 		err = xenvbd_sysfs_addif(dev);  in backend_changed()
653 		if (err) {  in backend_changed()
655 			xenbus_dev_fatal(dev, err, "creating sysfs entries");  in backend_changed()
659 	if (err) {  in backend_changed()
678 	int err;  in frontend_changed()  local
704 		err = xen_blkif_disconnect(be->blkif);  in frontend_changed()
705 		if (err) {  in frontend_changed()
706 			xenbus_dev_fatal(dev, err, "pending I/O");  in frontend_changed()
710 		err = connect_ring(be);  in frontend_changed()
711 		if (err)  in frontend_changed()
749 	int err;  in connect()  local
756 	err = xenbus_transaction_start(&xbt);  in connect()
757 	if (err) {  in connect()
758 		xenbus_dev_fatal(dev, err, "starting transaction");  in connect()
769 	err = xenbus_printf(xbt, dev->nodename, "feature-persistent", "%u", 1);  in connect()
770 	if (err) {  in connect()
771 		xenbus_dev_fatal(dev, err, "writing %s/feature-persistent",  in connect()
775 	err = xenbus_printf(xbt, dev->nodename, "feature-max-indirect-segments", "%u",  in connect()
777 	if (err)  in connect()
779 			 dev->nodename, err);  in connect()
781 	err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu",  in connect()
783 	if (err) {  in connect()
784 		xenbus_dev_fatal(dev, err, "writing %s/sectors",  in connect()
790 	err = xenbus_printf(xbt, dev->nodename, "info", "%u",  in connect()
793 	if (err) {  in connect()
794 		xenbus_dev_fatal(dev, err, "writing %s/info",  in connect()
798 	err = xenbus_printf(xbt, dev->nodename, "sector-size", "%lu",  in connect()
801 	if (err) {  in connect()
802 		xenbus_dev_fatal(dev, err, "writing %s/sector-size",  in connect()
806 	err = xenbus_printf(xbt, dev->nodename, "physical-sector-size", "%u",  in connect()
808 	if (err)  in connect()
809 		xenbus_dev_error(dev, err, "writing %s/physical-sector-size",  in connect()
812 	err = xenbus_transaction_end(xbt, 0);  in connect()
813 	if (err == -EAGAIN)  in connect()
815 	if (err)  in connect()
816 		xenbus_dev_fatal(dev, err, "ending transaction");  in connect()
818 	err = xenbus_switch_state(dev, XenbusStateConnected);  in connect()
819 	if (err)  in connect()
820 		xenbus_dev_fatal(dev, err, "%s: switching to Connected state",  in connect()
837 	int err, i, j;  in connect_ring()  local
841 	err = xenbus_scanf(XBT_NIL, dev->otherend, "event-channel", "%u",  in connect_ring()
843 	if (err != 1) {  in connect_ring()
844 		err = -EINVAL;  in connect_ring()
845 		xenbus_dev_fatal(dev, err, "reading %s/event-channel",  in connect_ring()
847 		return err;  in connect_ring()
851 	err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-page-order", "%u",  in connect_ring()
853 	if (err != 1) {  in connect_ring()
854 		err = xenbus_scanf(XBT_NIL, dev->otherend, "ring-ref",  in connect_ring()
856 		if (err != 1) {  in connect_ring()
857 			err = -EINVAL;  in connect_ring()
858 			xenbus_dev_fatal(dev, err, "reading %s/ring-ref",  in connect_ring()
860 			return err;  in connect_ring()
869 			err = -EINVAL;  in connect_ring()
870 			xenbus_dev_fatal(dev, err, "%s/request %d ring page order exceed max:%d",  in connect_ring()
873 			return err;  in connect_ring()
881 			err = xenbus_scanf(XBT_NIL, dev->otherend, ring_ref_name,  in connect_ring()
883 			if (err != 1) {  in connect_ring()
884 				err = -EINVAL;  in connect_ring()
885 				xenbus_dev_fatal(dev, err, "reading %s/%s",  in connect_ring()
887 				return err;  in connect_ring()
894 	err = xenbus_gather(XBT_NIL, dev->otherend, "protocol",  in connect_ring()
896 	if (err)  in connect_ring()
905 		xenbus_dev_fatal(dev, err, "unknown fe protocol %s", protocol);  in connect_ring()
908 	err = xenbus_gather(XBT_NIL, dev->otherend,  in connect_ring()
911 	if (err)  in connect_ring()
941 	err = xen_blkif_map(be->blkif, ring_ref, nr_grefs, evtchn);  in connect_ring()
942 	if (err) {  in connect_ring()
943 		xenbus_dev_fatal(dev, err, "mapping ring-ref port %u", evtchn);  in connect_ring()
944 		return err;  in connect_ring()