Support 'discard sectors' operation in translation layer support core (eae9acd1) · Commits · 戴 / test

drivers/mtd/mtd_blkdevs.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -32,6 +32,14 @@ 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)
		@@ -44,6 +52,10 @@ 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 0;

		@@ -367,6 +379,10 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)

		tr->blkcore_priv->rq->queuedata = tr;
		blk_queue_hardsect_size(tr->blkcore_priv->rq, tr->blksize);
		if (tr->discard)
		blk_queue_set_discard(tr->blkcore_priv->rq,
		blktrans_discard_request);

		tr->blkshift = ffs(tr->blksize) - 1;

		tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,

+1 −0

Original line number	Diff line number	Diff line
		@@ -81,6 +81,7 @@ enum {
		*/
		REQ_LB_OP_EJECT = 0x40, /* eject request */
		REQ_LB_OP_FLUSH = 0x41, /* flush device */
		REQ_LB_OP_DISCARD = 0x42, /* discard sectors */
		};

		/*

+2 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,8 @@ struct mtd_blktrans_ops {
		unsigned long block, char *buffer);
		int (writesect)(struct mtd_blktrans_dev dev,
		unsigned long block, char *buffer);
		int (discard)(struct mtd_blktrans_dev dev,
		unsigned long block, unsigned nr_blocks);

		/* Block layer ioctls */
		int (getgeo)(struct mtd_blktrans_dev dev, struct hd_geometry *geo);