fscache: Detect multiple relinquishment of a cookie

Report if an fscache cookie is relinquished multiple times by the netfs. Signed-off-by: David <[email protected]>
wafgo · Apr 4, 2018 · d0fb31e · d0fb31e
1 parent b27ddd4
commit d0fb31e
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
@@ -602,7 +602,8 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, bool retire)
 	       atomic_read(&cookie->n_active), retire);
 
 	/* No further netfs-accessing operations on this cookie permitted */
-	set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags);
+	if (test_and_set_bit(FSCACHE_COOKIE_RELINQUISHED, &cookie->flags))
+		BUG();
 
 	__fscache_disable_cookie(cookie, retire);