From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757424Ab2BHVRY (ORCPT ); Wed, 8 Feb 2012 16:17:24 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57405 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757023Ab2BHVRV (ORCPT ); Wed, 8 Feb 2012 16:17:21 -0500 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 03/17] FS-Cache: Check that there are no read ops when cookie relinquished To: linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-cachefs@redhat.com, linux-nfs@vger.kernel.org Date: Wed, 08 Feb 2012 21:17:11 +0000 Message-ID: <20120208211711.15607.46274.stgit@warthog.procyon.org.uk> In-Reply-To: <20120208211640.15607.58537.stgit@warthog.procyon.org.uk> References: <20120208211640.15607.58537.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Check that the netfs isn't trying to relinquish a cookie that still has read operations in progress upon it. If there are, then give log a warning and BUG. Signed-off-by: David Howells --- fs/fscache/cookie.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/fs/fscache/cookie.c b/fs/fscache/cookie.c index 9905350..0666996 100644 --- a/fs/fscache/cookie.c +++ b/fs/fscache/cookie.c @@ -452,6 +452,14 @@ void __fscache_relinquish_cookie(struct fscache_cookie *cookie, int retire) _debug("RELEASE OBJ%x", object->debug_id); + if (atomic_read(&object->n_reads)) { + spin_unlock(&cookie->lock); + printk(KERN_ERR "FS-Cache:" + " Cookie '%s' still has %d outstanding reads\n", + cookie->def->name, atomic_read(&object->n_reads)); + BUG(); + } + /* detach each cache object from the object cookie */ spin_lock(&object->lock); hlist_del_init(&object->cookie_link);