Xen devel - Dec 2009 - [PATCH] fs-backend: add a backend cleanup function

Hi all,
this patch implements a backend cleanup function in fs-backend so that
when the connection to the frontend is closed we don''t leak nodes on
xenstore.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

---

diff -r b4c47cfbb9b1 tools/fs-back/fs-backend.c
--- a/tools/fs-back/fs-backend.c	Wed Dec 02 15:02:06 2009 +0000
+++ b/tools/fs-back/fs-backend.c	Wed Dec 02 16:57:15 2009 +0000
@@ -179,6 +179,7 @@
 
 static void free_mount_request(struct fs_mount *mount) {
     FS_DEBUG("free_mount_request %s\n", mount->frontend);
+    xenbus_free_backend_node(mount);
     free(mount->frontend);
     free(mount->requests);
     free(mount->freelist);
@@ -356,8 +357,19 @@
                 if((dom_id >= 0) && (export_id >= 0) && d
== ''d'') {
                     char *frontend = xs_read(xsh, XBT_NULL,
watch_paths[XS_WATCH_PATH], NULL);
                     if (frontend) {
+                        char *p, *wp = strdup(watch_paths[XS_WATCH_PATH]);
                         handle_connection(dom_id, export_id, frontend);
-                        xs_rm(xsh, XBT_NULL, watch_paths[XS_WATCH_PATH]);
+                        xs_rm(xsh, XBT_NULL, wp);
+                        p = strrchr(wp, ''/'');
+                        if (p) {
+                            *p = ''\0'';
+                            p = strrchr(wp, ''/'');
+                            if (p) {
+                                *p = ''\0'';
+                                xs_rm(xsh, XBT_NULL, wp);
+                            }
+                        }
+                        free(wp);
                     }
                 }
             } else if (!strcmp(watch_paths[XS_WATCH_TOKEN],
"frontend-state")) {
diff -r b4c47cfbb9b1 tools/fs-back/fs-backend.h
--- a/tools/fs-back/fs-backend.h	Wed Dec 02 15:02:06 2009 +0000
+++ b/tools/fs-back/fs-backend.h	Wed Dec 02 16:57:15 2009 +0000
@@ -67,6 +67,7 @@
 int xenbus_read_mount_request(struct fs_mount *mount, char *frontend);
 bool xenbus_write_backend_node(struct fs_mount *mount);
 bool xenbus_write_backend_state(struct fs_mount *mount, const char *state);
+void xenbus_free_backend_node(struct fs_mount *mount);
 int xenbus_frontend_state_changed(struct fs_mount *mount, const char
*oldstate);
 bool xenbus_watch_frontend_state(struct fs_mount *mount);
 bool xenbus_unwatch_frontend_state(struct fs_mount *mount);
diff -r b4c47cfbb9b1 tools/fs-back/fs-xenbus.c
--- a/tools/fs-back/fs-xenbus.c	Wed Dec 02 15:02:06 2009 +0000
+++ b/tools/fs-back/fs-xenbus.c	Wed Dec 02 16:57:15 2009 +0000
@@ -204,6 +204,17 @@
     return xs_write(xsh, XBT_NULL, node, state, strlen(state));
 }
 
+void xenbus_free_backend_node(struct fs_mount *mount)
+{
+    char node[1024];
+    int self_id;
+
+    assert(xsh != NULL);
+    self_id = get_self_id();
+    snprintf(node, sizeof(node), ROOT_NODE"/%d", mount->mount_id);
+    xs_rm(xsh, XBT_NULL, node);
+}
+
 bool xenbus_watch_frontend_state(struct fs_mount *mount)
 {
     char statepath[1024];

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