Enable partitions for lguest block device

The lguest block device only requests one minor, which means
partitions don't work (eg "root=/dev/lgba1").

Let's follow the crowd and ask for 16.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/block/lguest_blk.c b/drivers/block/lguest_blk.c
index 93e3c40..160cf14 100644 (file)
--- a/drivers/block/lguest_blk.c
+++ b/drivers/block/lguest_blk.c
@@ -308,9 +308,12 @@ static int lguestblk_probe(struct lguest_device *lgdev)
        }
 
        /* This allocates a "struct gendisk" where we pack all the information
-        * about the disk which the rest of Linux sees.  We ask for one minor
-        * number; I do wonder if we should be asking for more. */
-       bd->disk = alloc_disk(1);
+        * about the disk which the rest of Linux sees.  The argument is the
+        * number of minor devices desired: we need one minor for the main
+        * disk, and one for each partition.  Of course, we can't possibly know
+        * how many partitions are on the disk (add_disk does that).
+        */
+       bd->disk = alloc_disk(16);
        if (!bd->disk) {
                err = -ENOMEM;
                goto out_unregister_blkdev;