From: Niu Yawei <yawei.niu@xxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit d68aab6b8f572406aa93b45ef6483934dd3b54a6 upstream.
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.
Fixes: 1ab6c4997e04a00c50c6d786c2f046adc0d1f5de
Signed-off-by: Niu Yawei <yawei.niu@xxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
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;
}
--
2.0.1
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