From: aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Tue, 18 Mar 2008 06:52:48 +0000 (+0000)
Subject: restore rw support for vvfat
X-Git-Tag: xen-3.3.0-rc1~280
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=7852e5da32b6d4e0993130bf28d7d3fceacb2e31;p=qemu-xen-3.4-testing.git

restore rw support for vvfat

(Carlo Marcelo Arenas)


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4080 c046a42c-6fe2-441c-8c8c-71466251a162
---

diff --git a/block-qcow.c b/block-qcow.c
index 730ae67e..0ac2b42b 100644
--- a/block-qcow.c
+++ b/block-qcow.c
@@ -752,11 +752,15 @@ static int qcow_create(const char *filename, int64_t total_size,
     header_size = sizeof(header);
     backing_filename_len = 0;
     if (backing_file) {
-        header.backing_file_offset = cpu_to_be64(header_size);
-        backing_filename_len = strlen(backing_file);
-        header.backing_file_size = cpu_to_be32(backing_filename_len);
-        header_size += backing_filename_len;
-        header.mtime = cpu_to_be32(0);
+        if (strcmp(backing_file, "fat:")) {
+            header.backing_file_offset = cpu_to_be64(header_size);
+            backing_filename_len = strlen(backing_file);
+            header.backing_file_size = cpu_to_be32(backing_filename_len);
+            header_size += backing_filename_len;
+        } else {
+            /* special backing file for vvfat */
+            backing_file = NULL;
+        }
         header.cluster_bits = 9; /* 512 byte cluster to avoid copying
                                     unmodifyed sectors */
         header.l2_bits = 12; /* 32 KB L2 tables */