nfsd4: fix hang on fast-booting nfs servers

The last_close field of a cache_detail is initialized to zero, so the
condition

	detail->last_close < seconds_since_boot() - 30

may be false even for a cache that was never opened.

However, we want to immediately fail upcalls to caches that were never
opened: in the case of the auth_unix_gid cache, especially, which may
never be opened by mountd (if the --manage-gids option is not set), we
want to fail the upcall immediately.  Otherwise client requests will be
dropped unnecessarily on reboot.

Also document these conditions.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index da872f9..ca7c621 100644 (file)
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1091,6 +1091,23 @@ static void warn_no_listener(struct cache_detail *detail)
        }
 }
 
+static bool cache_listeners_exist(struct cache_detail *detail)
+{
+       if (atomic_read(&detail->readers))
+               return true;
+       if (detail->last_close == 0)
+               /* This cache was never opened */
+               return false;
+       if (detail->last_close < seconds_since_boot() - 30)
+               /*
+                * We allow for the possibility that someone might
+                * restart a userspace daemon without restarting the
+                * server; but after 30 seconds, we give up.
+                */
+                return false;
+       return true;
+}
+
 /*
  * register an upcall request to user-space and queue it up for read() by the
  * upcall daemon.
@@ -1109,10 +1126,9 @@ int sunrpc_cache_pipe_upcall(struct cache_detail *detail, struct cache_head *h,
        char *bp;
        int len;
 
-       if (atomic_read(&detail->readers) == 0 &&
-           detail->last_close < seconds_since_boot() - 30) {
-                       warn_no_listener(detail);
-                       return -EINVAL;
+       if (!cache_listeners_exist(detail)) {
+               warn_no_listener(detail);
+               return -EINVAL;
        }
 
        buf = kmalloc(PAGE_SIZE, GFP_KERNEL);