From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.nokia.com ([147.243.1.47] helo=mgw-sa01.nokia.com) by canuck.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1QSUhL-0004hh-QL for linux-mtd@lists.infradead.org; Fri, 03 Jun 2011 13:46:01 +0000 Received: from eru.research.nokia.com (esdhcp038109.research.nokia.com [172.21.38.109]) by mgw-sa01.nokia.com (Switch-3.4.4/Switch-3.4.3) with ESMTP id p53Djuqi013884 for ; Fri, 3 Jun 2011 16:45:57 +0300 From: Artem Bityutskiy To: linux-mtd@lists.infradead.org Subject: [PATCH 05/10] UBIFS: fix shrinker object count reports Date: Fri, 3 Jun 2011 16:49:56 +0300 Message-Id: <1307109001-19761-6-git-send-email-dedekind1@gmail.com> In-Reply-To: <1307109001-19761-1-git-send-email-dedekind1@gmail.com> References: <1307109001-19761-1-git-send-email-dedekind1@gmail.com> List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Artem Bityutskiy Sometimes VM asks the shrinker to return amount of objects it can shrink, and we return the ubifs_clean_zn_cnt in that case. However, it is possible that this counter is negative for a short period of time, due to the way UBIFS TNC code updates it. And I can observe the following warnings sometimes: shrink_slab: ubifs_shrinker+0x0/0x2b7 [ubifs] negative objects to delete nr=-8541616642706119788 This patch makes sure UBIFS never returns negative count of objects. Signed-off-by: Artem Bityutskiy Cc: stable@kernel.org --- fs/ubifs/shrinker.c | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/fs/ubifs/shrinker.c b/fs/ubifs/shrinker.c index ca953a9..dfc105a 100644 --- a/fs/ubifs/shrinker.c +++ b/fs/ubifs/shrinker.c @@ -284,7 +284,11 @@ int ubifs_shrinker(struct shrinker *shrink, struct shrink_control *sc) long clean_zn_cnt = atomic_long_read(&ubifs_clean_zn_cnt); if (nr == 0) - return clean_zn_cnt; + /* + * Due to the way UBIFS updates the clean znode counter it may + * temporarily be negative. + */ + return clean_zn_cnt > 0 ?: 1; if (!clean_zn_cnt) { /* -- 1.7.2.3