[PATCH 06/12] fscache: Detect multiple relinquishment of a cookie

[David Howells]

Report if an fscache cookie is relinquished multiple times by the netfs.

Signed-off-by: David <dhowe...@redhat.com>
---

 fs/fscache/cookie.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c
index d705125665f0..98d22f495cd8 100644
--- 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);