[PATCH] remove use of get_gendisk in blkfront

[Xiaofeng Ling <xiaofeng.ling@intel.com>]

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remove use of get_gendisk in blkfront
gen_gendisk is no long exported by 2.6 kernel. this patch remove the 
call of get_gendisk by saving the gd point in blkfront_info in vbd.c so 
that blkfront can be built as kerenl module.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>


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diff -r 864434653dab linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c	
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/blkfront.c
@@ -660,6 +651,7 @@
 	info->vdevice = vdevice;
 	info->connected = BLKIF_STATE_DISCONNECTED;
 	info->mi = NULL;
+ 	info->gd = NULL;
 	INIT_WORK(&info->work, blkif_restart_queue, (void *)info);
 
 	info->shadow_free = 0;
diff -r 864434653dab linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h	
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/block.h
@@ -115,6 +115,7 @@
 	/* We watch the backend */
 	struct xenbus_watch watch;
 	dev_t dev;
+ 	struct gendisk *gd;
 	int vdevice;
 	blkif_vdev_t handle;
 	int connected;
diff -r 864434653dab linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
--- a/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
+++ b/linux-2.6-xen-sparse/drivers/xen/blkfront/vbd.c
@@ -266,6 +257,7 @@
 		gd->flags |= GENHD_FL_CD;
 
 	add_disk(gd);
+	info->gd = gd;
 
 	return 0;
 
@@ -298,23 +290,19 @@
 void
 xlvbd_del(struct blkfront_info *info)
 {
-	struct block_device *bd;
 	struct gendisk *gd;
 	int unused;
 	request_queue_t *rq;
 
-	bd = bdget(info->dev);
-	if (bd == NULL)
+	gd = info->gd;
+	if (gd == NULL)
 		return;
 
-	gd = get_gendisk(info->dev, &unused);
 	rq = gd->queue;
-
 	del_gendisk(gd);
 	put_disk(gd);
 	xlbd_put_major_info(info->mi);
 	info->mi = NULL;
 	blk_cleanup_queue(rq);
 
-	bdput(bd);
-}
+}

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