# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1313396962 -7200
# Node ID 4b483f4fa715566847b57f4c20908e5c3d38b5a2
# Parent 1f08b380d4386cdd6714786a9163e5f51aecab5d
xenstored: allow guests to shutdown all of its watches using XS_RESET_WATCHES
During kexec all old watches have to be removed, otherwise the new
kernel will receive unexpected events. Allow a guest to reset itself and
cleanup all of its watches.
Add a new XS_RESET_WATCHES command to do the reset on behalf of the guest.
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
diff -r 1f08b380d438 -r 4b483f4fa715 docs/misc/xenstore.txt
--- a/docs/misc/xenstore.txt
+++ b/docs/misc/xenstore.txt
@@ -217,6 +217,9 @@ WATCH_EVENT <epath>|<token>|
UNWATCH <wpath>|<token>|?
+RESET_WATCHES <dummy>
+ Reset all watches and transactions of the caller.
+
---------- Transactions ----------
TRANSACTION_START | <transid>|
diff -r 1f08b380d438 -r 4b483f4fa715 tools/xenstore/xenstored_core.c
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -120,6 +120,7 @@ static char *sockmsg_string(enum xsd_soc
case XS_IS_DOMAIN_INTRODUCED: return "XS_IS_DOMAIN_INTRODUCED";
case XS_RESUME: return "RESUME";
case XS_SET_TARGET: return "SET_TARGET";
+ case XS_RESET_WATCHES: return "RESET_WATCHES";
default:
return "**UNKNOWN**";
}
@@ -1242,6 +1243,10 @@ static void process_message(struct conne
do_set_target(conn, in);
break;
+ case XS_RESET_WATCHES:
+ do_reset_watches(conn);
+ break;
+
default:
eprintf("Client unknown operation %i", in->hdr.msg.type);
send_error(conn, ENOSYS);
diff -r 1f08b380d438 -r 4b483f4fa715 tools/xenstore/xenstored_domain.c
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -537,6 +537,20 @@ void do_is_domain_introduced(struct conn
send_reply(conn, XS_IS_DOMAIN_INTRODUCED, result ? "T" : "F", 2);
}
+/* Allow guest to reset all watches */
+void do_reset_watches(struct connection *conn)
+{
+ if (!conn->can_write) {
+ send_error(conn, EACCES);
+ return;
+ }
+
+ conn_delete_all_watches(conn);
+ conn_delete_all_transactions(conn);
+
+ send_ack(conn, XS_RESET_WATCHES);
+}
+
static int close_xc_handle(void *_handle)
{
xc_interface_close(*(xc_interface**)_handle);
diff -r 1f08b380d438 -r 4b483f4fa715 tools/xenstore/xenstored_domain.h
--- a/tools/xenstore/xenstored_domain.h
+++ b/tools/xenstore/xenstored_domain.h
@@ -40,6 +40,9 @@ void do_set_target(struct connection *co
/* domid */
void do_get_domain_path(struct connection *conn, const char *domid_str);
+/* Allow guest to reset all watches */
+void do_reset_watches(struct connection *conn);
+
void domain_init(void);
/* Returns the implicit path of a connection (only domains have this) */
diff -r 1f08b380d438 -r 4b483f4fa715 xen/include/public/io/xs_wire.h
--- a/xen/include/public/io/xs_wire.h
+++ b/xen/include/public/io/xs_wire.h
@@ -48,7 +48,8 @@ enum xsd_sockmsg_type
XS_IS_DOMAIN_INTRODUCED,
XS_RESUME,
XS_SET_TARGET,
- XS_RESTRICT
+ XS_RESTRICT,
+ XS_RESET_WATCHES
};
#define XS_WRITE_NONE "NONE"
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