linux-kernel - [PATCH 07/17] blktrans: allow FTL drivers to export sysfs attributes

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Message-Id: <1264863768-27606-8-git-send-email-maximlevitsky@gmail.com>
Date:	Sat, 30 Jan 2010 17:02:38 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Artem Bityutskiy <dedekind1@...il.com>,
	linux-mtd <linux-mtd@...ts.infradead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Alex Dubov <oakad@...oo.com>, joern <joern@...fs.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Maxim Levitsky <maximlevitsky@...il.com>
Subject: [PATCH 07/17] blktrans: allow FTL drivers to export sysfs attributes

This patch add ability to export sysfs attributes below
block disk device.
This can be used to pass UDEV information about the FTL
and could include vendor, serial, version, etc...

Signed-off-by: Maxim Levitsky <maximlevitsky@...il.com>
---
 drivers/mtd/mtd_blkdevs.c    |   11 ++++++++++-
 include/linux/mtd/blktrans.h |    2 ++
 2 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index a65eb07..1c4e615 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -317,7 +317,6 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 
 	set_capacity(gd, (new->size * tr->blksize) >> 9);
 
-
 	/* Create the request queue */
 	spin_lock_init(&new->queue_lock);
 	new->rq = blk_init_queue(mtd_blktrans_request, &new->queue_lock);
@@ -350,6 +349,11 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	new->open = 0;
 	add_disk(gd);
 
+	if (new->disk_attributes)
+		sysfs_create_group(&disk_to_dev(gd)->kobj,
+					new->disk_attributes);
+
+
 	return 0;
 error4:
 	blk_cleanup_queue(new->rq);
@@ -376,6 +380,11 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
 	/* stop new requests to arrive */
 	del_gendisk(old->disk);
 
+
+	if (old->disk_attributes)
+		sysfs_remove_group(&disk_to_dev(old->disk)->kobj,
+						old->disk_attributes);
+
 	/* flush current requests */
 	spin_lock_irqsave(&old->queue_lock, flags);
 	old->deleted = 1;
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
index e276aca..faf1e54 100644
--- a/include/linux/mtd/blktrans.h
+++ b/include/linux/mtd/blktrans.h
@@ -9,6 +9,7 @@
 #define __MTD_TRANS_H__
 
 #include <linux/mutex.h>
+#include <linux/sysfs.h>
 
 struct hd_geometry;
 struct mtd_info;
@@ -27,6 +28,7 @@ struct mtd_blktrans_dev {
 	int deleted;
 	int open;
 	struct gendisk *disk;
+	struct attribute_group *disk_attributes;
 	struct task_struct *thread;
 	struct request_queue *rq;
 	spinlock_t queue_lock;
-- 
1.6.3.3

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