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authorJan Kara <jack@suse.cz>2012-04-24 19:08:41 +0400
committerJan Kara <jack@suse.cz>2012-05-16 01:34:37 +0400
commitd7e9711760a17aef3a94fc6dff4759fa5961de25 (patch)
tree260d71f39f9d876347e53d44467e536e4c09ea90 /fs/quota
parentfd2cbd4dfa3db477dd6226d387d3f1911d36a6a9 (diff)
downloadlinux-d7e9711760a17aef3a94fc6dff4759fa5961de25.tar.xz
quota: Fix double lock in add_dquot_ref() with CONFIG_QUOTA_DEBUG
When CONFIG_QUOTA_DEBUG is enabled we call inode_get_rsv_space() from add_dquot_ref() while holding i_lock. But inode_get_rsv_space() is trying to get i_lock as well resulting in double lock. Fix the problem by moving inode_get_rsv_space() call out of i_lock. Reported-and-analyzed-by: Jie Liu <jeff.liu@oracle.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/quota')
-rw-r--r--fs/quota/dquot.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index d69a1d1d7e15..0dcdda305c99 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -907,14 +907,14 @@ static void add_dquot_ref(struct super_block *sb, int type)
spin_unlock(&inode->i_lock);
continue;
}
-#ifdef CONFIG_QUOTA_DEBUG
- if (unlikely(inode_get_rsv_space(inode) > 0))
- reserved = 1;
-#endif
__iget(inode);
spin_unlock(&inode->i_lock);
spin_unlock(&inode_sb_list_lock);
+#ifdef CONFIG_QUOTA_DEBUG
+ if (unlikely(inode_get_rsv_space(inode) > 0))
+ reserved = 1;
+#endif
iput(old_inode);
__dquot_initialize(inode, type);