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authorNiu Yawei <yawei.niu@gmail.com>2014-06-04 12:22:13 +0800
committerJan Kara <jack@suse.cz>2014-07-15 22:36:18 +0200
commitd68aab6b8f572406aa93b45ef6483934dd3b54a6 (patch)
treee21ddba36d8ffa6706dc0c0db4ff7f8a81a92f2e /fs/quota
parent1795cd9b3a91d4b5473c97f491d63892442212ab (diff)
downloadlinux-d68aab6b8f572406aa93b45ef6483934dd3b54a6.tar.bz2
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 <yawei.niu@intel.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/quota')
-rw-r--r--fs/quota/dquot.c2
1 files changed, 2 insertions, 0 deletions
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;
}