block: use normal I/O path for discard requests
[linux-2.6.git] / drivers / mtd / mtd_blkdevs.c
index 0acbf4f..8ca17a3 100644 (file)
@@ -32,14 +32,6 @@ struct mtd_blkcore_priv {
        spinlock_t queue_lock;
 };
 
-static int blktrans_discard_request(struct request_queue *q,
-                                   struct request *req)
-{
-       req->cmd_type = REQ_TYPE_LINUX_BLOCK;
-       req->cmd[0] = REQ_LB_OP_DISCARD;
-       return 0;
-}
-
 static int do_blktrans_request(struct mtd_blktrans_ops *tr,
                               struct mtd_blktrans_dev *dev,
                               struct request *req)
@@ -52,10 +44,6 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 
        buf = req->buffer;
 
-       if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
-           req->cmd[0] == REQ_LB_OP_DISCARD)
-               return tr->discard(dev, block, nsect);
-
        if (!blk_fs_request(req))
                return -EIO;
 
@@ -63,6 +51,9 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
            get_capacity(req->rq_disk))
                return -EIO;
 
+       if (blk_discard_rq(req))
+               return tr->discard(dev, block, nsect);
+
        switch(rq_data_dir(req)) {
        case READ:
                for (; nsect > 0; nsect--, block++, buf += tr->blksize)
@@ -380,8 +371,8 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
        tr->blkcore_priv->rq->queuedata = tr;
        blk_queue_logical_block_size(tr->blkcore_priv->rq, tr->blksize);
        if (tr->discard)
-               blk_queue_set_discard(tr->blkcore_priv->rq,
-                                     blktrans_discard_request);
+               queue_flag_set_unlocked(QUEUE_FLAG_DISCARD,
+                                       tr->blkcore_priv->rq);
 
        tr->blkshift = ffs(tr->blksize) - 1;