9p: introduce the V9fsDir type

If we are to switch back to readdir(), we need a more complex type than
DIR * to be able to serialize concurrent accesses to the directory stream.

This patch introduces a placeholder type and fixes all users.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
index 43378943cd..92ee309ef4 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -167,13 +167,17 @@ typedef struct V9fsXattr
     int flags;
 } V9fsXattr;
 
+typedef struct V9fsDir {
+    DIR *stream;
+} V9fsDir;
+
 /*
  * Filled by fs driver on open and other
  * calls.
  */
 union V9fsFidOpenState {
     int fd;
-    DIR *dir;
+    V9fsDir dir;
     V9fsXattr xattr;
     /*
      * private pointer for fs drivers, that