File 24610-xenpaging_make_file_op_largefile_aware.patch of Package xen

changeset:   24610:255ae011567d
user:        Olaf Hering <olaf@aepfle.de>
date:        Fri Jan 27 19:03:37 2012 +0000
files:       tools/xenpaging/file_ops.c
description:
xenpaging: make file_op largefile aware

lseek() takes an off_t, the used "int << shiftsize" does not automatically
convert the int into a larger type. This leads to write errors with pagefiles
larger than 2G. Fix this by shifting an off_t instead of an int.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>


---
 tools/xenpaging/file_ops.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Index: xen-4.1.2-testing/tools/xenpaging/file_ops.c
===================================================================
--- xen-4.1.2-testing.orig/tools/xenpaging/file_ops.c
+++ xen-4.1.2-testing/tools/xenpaging/file_ops.c
@@ -26,12 +26,12 @@
 static int file_op(int fd, void *page, int i,
                    ssize_t (*fn)(int, void *, size_t))
 {
-    off_t seek_ret;
+    off_t offset = i;
     int total = 0;
     int bytes;
 
-    seek_ret = lseek(fd, i << PAGE_SHIFT, SEEK_SET);
-    if ( seek_ret == (off_t)-1 )
+    offset = lseek(fd, offset << PAGE_SHIFT, SEEK_SET);
+    if ( offset == (off_t)-1 )
         return -1;
 
     while ( total < PAGE_SIZE )