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[PATCH 4/10] UML - allow ubd devices to provide partial end blocks
- From: Jeff Dike <jdike@xxxxxxxxxxx>
- Date: Mon, 17 Jan 2005 00:56:08 -0500
If the file backing a ubd device is not an even blocklength, then the last
partial block is now readable, and it is padded with zeros.
Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxx>
Index: 2.6.10/arch/um/drivers/ubd_kern.c
===================================================================
--- 2.6.10.orig/arch/um/drivers/ubd_kern.c 2005-01-16 20:37:24.000000000 -0500
+++ 2.6.10/arch/um/drivers/ubd_kern.c 2005-01-16 20:40:41.000000000 -0500
@@ -682,6 +682,8 @@
return 0;
}
+#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
+
static int ubd_add(int n)
{
struct ubd *dev = &ubd_dev[n];
@@ -697,6 +699,8 @@
if(err < 0)
return(err);
+ dev->size = ROUND_BLOCK(dev->size);
+
err = ubd_new_disk(MAJOR_NR, dev->size, n, &ubd_gendisk[n]);
if(err)
return(err);
-
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