linux-ext4 - [PATCH 4/5] quota: missing lock in dqcache_shrink

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Date:	Wed, 04 Jun 2014 12:22:13 +0800
From:	Niu Yawei <yawei.niu@...il.com>
To:	Jan Kara <jack@...e.cz>
CC:	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	yawei.niu@...el.com, andreas.dilger@...el.com, lai.siyao@...el.com
Subject: [PATCH 4/5] quota: missing lock in dqcache_shrink_scan()

dqcache_shrink_scan() should use dq_list_lock to protect the
scan on free_dquots list.

Signed-off-by: Niu Yawei <yawei.niu@...el.com>
---
 fs/quota/dquot.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 51b5763..a94d464 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;
 }
 
-- 
1.7.1


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