[PATCH] possible bug in quota format v2 support

[Niu YaWei <niu@clusterfs.com>]

Hi Jan,

I'm afraid that there is a bug in quota format v2 delete qentry.
(The root block shouldn't be put into free blk list even if there isn't
any entry in quota file, right?)

This one line patch may fix it.

Thanks.

- Niu

--- linux-2.6.7/fs/quota_v2.c   2005-01-21 16:47:34.000000000 +0800
+++ linux-2.6.7-quota-v2/fs/quota_v2.c  2005-03-31 21:08:30.012641840 +0800
@@ -529,7 +529,8 @@ static int remove_tree(struct dquot *dqu
                int i;
                ref[GETIDINDEX(dquot->dq_id, depth)] = cpu_to_le32(0);
                for (i = 0; i < V2_DQBLKSIZE && !buf[i]; i++);  /* Block 
got empty? */
-               if (i == V2_DQBLKSIZE) {
+               /* don't put the root block into the free block list */
+               if (i == V2_DQBLKSIZE && *blk != V2_DQTREEOFF) {
                        put_free_dqblk(filp, dquot->dq_type, buf, *blk);
                        *blk = 0;
                }