The commit is pushed to "branch-rh7-3.10.0-229.7.2-ovz" and will appear at
https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.6.7
------>
commit 51364e080f990bd1ac9b4a7a8b8ba036d806ccb9
Author: Niu Yawei <[email protected]>
Date: Mon Sep 7 14:15:48 2015 +0400
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: [email protected]
Fixes: 1ab6c4997e04a00c50c6d786c2f046adc0d1f5de
Signed-off-by: Niu Yawei <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
(cherry picked from commit d68aab6b8f572406aa93b45ef6483934dd3b54a6)
Reported-by: Alexey Lyashkov <[email protected]>
Signed-off-by: Vladimir Davydov <[email protected]>
---
fs/quota/dquot.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 6f78cdcdecf2..0928842a95ed 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -690,6 +690,7 @@ 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);
@@ -701,6 +702,7 @@ dqcache_shrink_scan(struct shrinker *shrink, struct
shrink_control *sc)
freed++;
head = free_dquots.prev;
}
+ spin_unlock(&dq_list_lock);
return freed;
}
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