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| author | Jan Kara <jack@suse.cz> | 2012-04-24 17:08:41 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2012-05-15 23:34:37 +0200 |
| commit | d7e9711760a17aef3a94fc6dff4759fa5961de25 (patch) | |
| tree | 260d71f39f9d876347e53d44467e536e4c09ea90 /fs/quota | |
| parent | fd2cbd4dfa3db477dd6226d387d3f1911d36a6a9 (diff) | |
| download | linux-d7e9711760a17aef3a94fc6dff4759fa5961de25.tar.gz linux-d7e9711760a17aef3a94fc6dff4759fa5961de25.tar.bz2 linux-d7e9711760a17aef3a94fc6dff4759fa5961de25.zip | |
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.c | 8 |
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); |