Allow xen guests to plug disks of 1 TiB or more

The current xen backend driver implementation uses int64_t variables
to store the size of the corresponding backend disk/file. It also uses
an int64_t variable to store the block size of that image. When writing
the number of sectors (file_size/block_size) to xenstore, however, it
passes these values as 32 bit signed integers. This will cause an
overflow for any disk of 1 TiB or more.

This patch changes the xen backend driver to use a 64 bit integer write
xenstore function.

upstream-commit-id: 9246ce881128df2a69178779c1ef33c83df3c70d

Signed-off-by: Felipe Franciosi <felipe@paradoxo.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/hw/xen_disk.c b/hw/xen_disk.c
index 668cb54f7ab1e79032fed107d41b85ced2cfce6e..f484404342cce199c4935a4e12a35bc777a174d6 100644 (file)
--- a/hw/xen_disk.c
+++ b/hw/xen_disk.c
@@ -826,8 +826,8 @@ static int blk_connect(struct XenDevice *xendev)
 
     /* Fill in number of sector size and number of sectors */
     xenstore_write_be_int(&blkdev->xendev, "sector-size", blkdev->file_blk);
-    xenstore_write_be_int(&blkdev->xendev, "sectors",
-                          blkdev->file_size / blkdev->file_blk);
+    xenstore_write_be_int64(&blkdev->xendev, "sectors",
+                            blkdev->file_size / blkdev->file_blk);
 
     if (xenstore_read_fe_int(&blkdev->xendev, "ring-ref", &blkdev->ring_ref) == -1) {
         return -1;