Make xenstored use tdb, transactions can soft-fail (EAGAIN)

Transactions no longer take root dir, no longer lock & block: commit can fail spuriously with EAGAIN, not ETIMEDOUT.
Speeds up transactions by over 1000 times, should be NFS safe.
New program: xs_tdb_dump to dump raw TDB contents.
Don't do failure testing: we are no longer robust against all ENOMEM 8(
Introduce "struct node" which contains perms, children and data.
Make struct xs_permissions unpadded, so we can write to tdb w/o valgrind complaints.
Gently modify TDB to use talloc, not do alloc on tdb_delete.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 2 insertions, 8 deletions

diff --git a/tools/xenstore/xenstored_watch.h b/tools/xenstore/xenstored_watch.h
index 30d7e9e172..ed8892c4aa 100644
--- a/tools/xenstore/xenstored_watch.h
+++ b/tools/xenstore/xenstored_watch.h
@@ -32,15 +32,9 @@ bool is_watch_event(struct connection *conn, struct buffered_data *out);
 /* Look through our watches: if any of them have an event, queue it. */
 void queue_next_event(struct connection *conn);
 
-/* Fire all watches: recurse means all the children are effected (ie. rm).
+/* Fire all watches: recurse means all the children are affected (ie. rm).
  */
-void fire_watches(struct connection *conn, const char *node, bool recurse);
-
-/* Find shortest timeout: if any, reduce tv (may already be set). */
-void shortest_watch_ack_timeout(struct timeval *tv);
-
-/* Check for watches which may have timed out. */
-void check_watch_ack_timeout(void);
+void fire_watches(struct connection *conn, const char *name, bool recurse);
 
 void dump_watches(struct connection *conn);