[Qemu-devel] [PATCH v2] qga: fix append file open modes for win32

[Kirk Allan <kallan@suse.com>]

For append file open modes, use FILE_APPEND_DATA for the desired access
for writing at the end of the file.

Version 2:
For "a+", "ab+", and "a+b" modes use FILE_APPEND_DATA|GENERIC_READ.
ORing in GENERIC_READ starts a read at the begining of the file.  All
writes will append to the end fo the file.

Added white space to maintain the alignment of the guest_file_open_modes[].

Signed-off-by: Kirk Allan <kallan@suse.com>
---
 qga/commands-win32.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index a5306e7..5a75c3d 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -66,20 +66,20 @@ typedef struct OpenFlags {
     DWORD creation_disposition;
 } OpenFlags;
 static OpenFlags guest_file_open_modes[] = {
-    {"r",   GENERIC_READ,               OPEN_EXISTING},
-    {"rb",  GENERIC_READ,               OPEN_EXISTING},
-    {"w",   GENERIC_WRITE,              CREATE_ALWAYS},
-    {"wb",  GENERIC_WRITE,              CREATE_ALWAYS},
-    {"a",   GENERIC_WRITE,              OPEN_ALWAYS  },
-    {"r+",  GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
-    {"rb+", GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
-    {"r+b", GENERIC_WRITE|GENERIC_READ, OPEN_EXISTING},
-    {"w+",  GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
-    {"wb+", GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
-    {"w+b", GENERIC_WRITE|GENERIC_READ, CREATE_ALWAYS},
-    {"a+",  GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS  },
-    {"ab+", GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS  },
-    {"a+b", GENERIC_WRITE|GENERIC_READ, OPEN_ALWAYS  }
+    {"r",   GENERIC_READ,                  OPEN_EXISTING},
+    {"rb",  GENERIC_READ,                  OPEN_EXISTING},
+    {"w",   GENERIC_WRITE,                 CREATE_ALWAYS},
+    {"wb",  GENERIC_WRITE,                 CREATE_ALWAYS},
+    {"a",   FILE_APPEND_DATA,              OPEN_ALWAYS  },
+    {"r+",  GENERIC_WRITE|GENERIC_READ,    OPEN_EXISTING},
+    {"rb+", GENERIC_WRITE|GENERIC_READ,    OPEN_EXISTING},
+    {"r+b", GENERIC_WRITE|GENERIC_READ,    OPEN_EXISTING},
+    {"w+",  GENERIC_WRITE|GENERIC_READ,    CREATE_ALWAYS},
+    {"wb+", GENERIC_WRITE|GENERIC_READ,    CREATE_ALWAYS},
+    {"w+b", GENERIC_WRITE|GENERIC_READ,    CREATE_ALWAYS},
+    {"a+",  FILE_APPEND_DATA|GENERIC_READ, OPEN_ALWAYS  },
+    {"ab+", FILE_APPEND_DATA|GENERIC_READ, OPEN_ALWAYS  },
+    {"a+b", FILE_APPEND_DATA|GENERIC_READ, OPEN_ALWAYS  }
 };
 
 static OpenFlags *find_open_flag(const char *mode_str)
-- 
1.8.5.6