From d68aab6b8f572406aa93b45ef6483934dd3b54a6 Mon Sep 17 00:00:00 2001 From: Niu Yawei Date: Wed, 4 Jun 2014 12:22:13 +0800 Subject: [PATCH] quota: missing lock in dqcache_shrink_scan() Commit 1ab6c4997e04 (fs: convert fs shrinkers to new scan/count API) accidentally removed locking from quota shrinker. Fix it - dqcache_shrink_scan() should use dq_list_lock to protect the scan on free_dquots list. CC: stable@vger.kernel.org Fixes: 1ab6c4997e04a00c50c6d786c2f046adc0d1f5de Signed-off-by: Niu Yawei Signed-off-by: Jan Kara --- fs/quota/dquot.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 9cd5f63715c0..7f30bdc57d13 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -702,6 +702,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) struct dquot *dquot; unsigned long freed = 0; + spin_lock(&dq_list_lock); head = free_dquots.prev; while (head != &free_dquots && sc->nr_to_scan) { dquot = list_entry(head, struct dquot, dq_free); @@ -713,6 +714,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) freed++; head = free_dquots.prev; } + spin_unlock(&dq_list_lock); return freed; } -- 2.20.1