mtd: blktrans: allow FTL drivers to export sysfs attributes

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=026ec57886b67c092bf7baecd029a7c1c4998c28
Commit:     026ec57886b67c092bf7baecd029a7c1c4998c28
Parent:     75c0b84d41c6f08c0cb083464907005683ef2920
Author:     Maxim Levitsky <maximlevitsky at gmail.com>
AuthorDate: Mon Feb 22 20:39:33 2010 +0200
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Fri Feb 26 17:37:40 2010 +0000

    mtd: blktrans: allow FTL drivers to export sysfs attributes
    
    This patch adds an ability to export sysfs attributes below
    the block disk device.
    
    This can be used to pass the udev an information about the FTL
    and could include the vendor, serial, version, etc...
    
    Signed-off-by: Maxim Levitsky <maximlevitsky at gmail.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 drivers/mtd/mtd_blkdevs.c    |    8 ++++++++
 include/linux/mtd/blktrans.h |    2 ++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 646cc84..9dd23d6 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -379,6 +379,10 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 		set_disk_ro(gd, 1);
 
 	add_disk(gd);
+
+	if (new->disk_attributes)
+		sysfs_create_group(&disk_to_dev(gd)->kobj,
+					new->disk_attributes);
 	return 0;
 error4:
 	module_put(tr->owner);
@@ -405,6 +409,10 @@ 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);
+
 	/* Stop the thread */
 	kthread_stop(old->thread);
 
diff --git a/include/linux/mtd/blktrans.h b/include/linux/mtd/blktrans.h
index d89b8fb..b481ccd 100644
--- a/include/linux/mtd/blktrans.h
+++ b/include/linux/mtd/blktrans.h
@@ -10,6 +10,7 @@
 
 #include <linux/mutex.h>
 #include <linux/kref.h>
+#include <linux/sysfs.h>
 
 struct hd_geometry;
 struct mtd_info;
@@ -28,6 +29,7 @@ struct mtd_blktrans_dev {
 	int open;
 	struct kref ref;
 	struct gendisk *disk;
+	struct attribute_group *disk_attributes;
 	struct task_struct *thread;
 	struct request_queue *rq;
 	spinlock_t queue_lock;