[PATCH] fix display of NBD in /proc/partitions

The recent change to /proc/partitions which prevents it from displaying
removeable media accidentally caused 128 NBD and 16 ramdisk partitions to
appear in /proc/partitions instead.

So add a specific gendisk flag which says "don't show me in /proc/partitions"
and use that.

drivers/block/genhd.c

@@ -262,8 +262,9 @@ static int show_partition(struct seq_file *part, void *v)
 
 	/* Don't show non-partitionable removeable devices or empty devices */
 	if (!get_capacity(sgp) ||
-	    (sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE))
-		)
+			(sgp->minors == 1 && (sgp->flags & GENHD_FL_REMOVABLE)))
+		return 0;
+	if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)
 		return 0;
 
 	/* show the full disk and all non-0 size partitions of it */

drivers/block/nbd.c

@@ -741,6 +741,7 @@ static int __init nbd_init(void)
 		disk->first_minor = i;
 		disk->fops = &nbd_fops;
 		disk->private_data = &nbd_dev[i];
+		disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
 		sprintf(disk->disk_name, "nbd%d", i);
 		sprintf(disk->devfs_name, "nbd/%d", i);
 		set_capacity(disk, 0x3ffffe);

drivers/block/rd.c

@@ -354,6 +354,7 @@ static int __init rd_init (void)
 		disk->first_minor = i;
 		disk->fops = &rd_bd_op;
 		disk->queue = rd_queue[i];
+		disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO;
 		sprintf(disk->disk_name, "ram%d", i);
 		sprintf(disk->devfs_name, "rd/%d", i);
 		set_capacity(disk, rd_size * 2);

include/linux/genhd.h

@@ -68,6 +68,7 @@ struct hd_struct {
 #define GENHD_FL_DRIVERFS			2
 #define GENHD_FL_CD				8
 #define GENHD_FL_UP				16
+#define GENHD_FL_SUPPRESS_PARTITION_INFO	32
 
 struct disk_stats {
 	unsigned read_sectors, write_sectors;