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quota: add missing use of dq_data_lock in __dquot_initialize

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The bulk of __dquot_initialize runs under the dqptr_sem which
protects the inode->i_dquot pointers. It doesn't protect the
dereferenced contents, though. Those are protected by the
dq_data_lock, which is missing around the dquot_resv_space call.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jeff Mahoney 2013-02-27 14:43:09 -05:00 committed by Jan Kara
parent f6161aa153
commit 68ac8bfb6a
1 changed files with 4 additions and 1 deletions
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5
fs/quota/dquot.c
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@ -1439,8 +1439,11 @@ static void __dquot_initialize(struct inode *inode, int type)
* did a write before quota was turned on * did a write before quota was turned on
*/ */
rsv = inode_get_rsv_space(inode); rsv = inode_get_rsv_space(inode);
if (unlikely(rsv)) if (unlikely(rsv)) {
spin_lock(&dq_data_lock);
dquot_resv_space(inode->i_dquot[cnt], rsv); dquot_resv_space(inode->i_dquot[cnt], rsv);
spin_unlock(&dq_data_lock);
}
} }
} }
out_err: out_err: