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Date: Sat, 09 Sep 2017 12:19:22 +0300
From: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
To: Jan Kara <jack@...e.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH] quota: add missing lock into __dquot_transfer()
Lock dq_dqb_lock around dquot_decr_inodes()
Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Fixes: 7b9ca4c61bc2 ("quota: Reduce contention on dq_data_lock")
---
fs/quota/dquot.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 8381db9db6d9..50b0556a124f 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -1980,7 +1980,9 @@ int __dquot_transfer(struct inode *inode, struct dquot **transfer_to)
ret = dquot_add_space(transfer_to[cnt], cur_space, rsv_space, 0,
&warn_to[cnt]);
if (ret) {
+ spin_lock(&transfer_to[cnt]->dq_dqb_lock);
dquot_decr_inodes(transfer_to[cnt], inode_usage);
+ spin_unlock(&transfer_to[cnt]->dq_dqb_lock);
goto over_quota;
}
}
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