[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [patch 3/6] allow reconnects to the backend driver
Hi, The patch below changes the netback and blkback device drivers to allow and handle frontend state transition from "Closing" to "Initialising". Instead of destroying the backend device then they wait for a reconnect from the frontend. Needed for domU kexec support, to hand over devices from one kernel instance to the next. please apply, Gerd -- Gerd Hoffmann <kraxel@xxxxxxx> http://www.suse.de/~kraxel/julika-dora.jpeg Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxx> Index: source-lnx-stable-22813/drivers/xen/blkback/xenbus.c =================================================================== --- source-lnx-stable-22813.orig/drivers/xen/blkback/xenbus.c 2006-08-17 15:19:20.000000000 +0200 +++ source-lnx-stable-22813/drivers/xen/blkback/xenbus.c 2006-08-17 15:20:17.000000000 +0200 @@ -305,6 +305,11 @@ static void frontend_changed(struct xenb switch (frontend_state) { case XenbusStateInitialising: + if (dev->state == XenbusStateClosing) { + printk("%s: %s: prepare for reconnect\n", + __FUNCTION__, dev->nodename); + xenbus_switch_state(dev, XenbusStateInitWait); + } break; case XenbusStateInitialised: Index: source-lnx-stable-22813/drivers/xen/netback/xenbus.c =================================================================== --- source-lnx-stable-22813.orig/drivers/xen/netback/xenbus.c 2006-08-17 15:19:20.000000000 +0200 +++ source-lnx-stable-22813/drivers/xen/netback/xenbus.c 2006-08-17 15:20:17.000000000 +0200 @@ -228,10 +228,25 @@ static void frontend_changed(struct xenb switch (frontend_state) { case XenbusStateInitialising: + if (dev->state == XenbusStateClosing) { + printk("%s: %s: prepare for reconnect\n", + __FUNCTION__, dev->nodename); + if (be->netif) { + netif_disconnect(be->netif); + be->netif = NULL; + } + xenbus_switch_state(dev, XenbusStateInitWait); + } + break; + case XenbusStateInitialised: break; case XenbusStateConnected: + if (!be->netif) { + /* reconnect: setup be->netif */ + backend_changed(&be->backend_watch, NULL, 0); + } maybe_connect(be); break; _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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