[PATCH] rumpdisk: Use raw uncached character device rwdXd

[Damien Zammit]

Needs an explicit memset to ensure allocation is done before DMA read
---
 rumpdisk/block-rump.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/rumpdisk/block-rump.c b/rumpdisk/block-rump.c
index 80cdc350..f51c1adb 100644
--- a/rumpdisk/block-rump.c
+++ b/rumpdisk/block-rump.c
@@ -86,12 +86,12 @@ search_bd (char *name)
   return NULL;
 }
 
-/* BSD name of whole disk device is /dev/wdXd
+/* BSD name of whole disk device is /dev/rwdXd
  * but we will receive wdX as the name */
 static void
 translate_name (char *output, int len, char *name)
 {
-  snprintf (output, len - 1, "/dev/%sd", name);
+  snprintf (output, len - 1, "/dev/r%sd", name);
 }
 
 static boolean_t
@@ -324,6 +324,9 @@ rumpdisk_device_read (void *d, mach_port_t reply_port,
   if (buf == MAP_FAILED)
     return errno;
 
+  /* Ensure alloc */
+  memset (buf, 0, npages * pagesize);
+
   err = rump_sys_pread (bd->rump_fd, (void *)buf, (size_t)count, (off_t)bn * 
bd->block_size);
   if (err < 0)
     {
-- 
2.32.0