From eae9acd13a8d14b50c00a961fa959606f34bbd92 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Tue, 5 Aug 2008 18:08:25 +0100 Subject: [PATCH] Support 'discard sectors' operation in translation layer support core Signed-off-by: David Woodhouse Signed-off-by: Jens Axboe --- drivers/mtd/mtd_blkdevs.c | 16 ++++++++++++++++ include/linux/blkdev.h | 1 + include/linux/mtd/blktrans.h | 2 ++ 3 files changed, 19 insertions(+) diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index 9ff007c4962..681d5aca2af 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -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, diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 26ececbbebe..727886d25c4 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -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 */ }; /* diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h index 310e6160641..8b4aa0523db 100644 --- a/include/linux/mtd/blktrans.h +++ b/include/linux/mtd/blktrans.h @@ -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); -- 2.41.1