hw/9pfs: Add yield support for readdir related coroutines
This include readdir, telldir, seekdir, rewinddir.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
diff --git a/hw/9pfs/codir.c b/hw/9pfs/codir.c
new file mode 100644
index 0000000..47b10df
--- /dev/null
+++ b/hw/9pfs/codir.c
@@ -0,0 +1,66 @@
+
+/*
+ * Virtio 9p backend
+ *
+ * Copyright IBM, Corp. 2011
+ *
+ * Authors:
+ * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "fsdev/qemu-fsdev.h"
+#include "qemu-thread.h"
+#include "qemu-coroutine.h"
+#include "virtio-9p-coth.h"
+
+int v9fs_co_readdir(V9fsState *s, V9fsFidState *fidp, struct dirent **dent)
+{
+ int err;
+
+ v9fs_co_run_in_worker(
+ {
+ errno = 0;
+ /*FIXME!! need to switch to readdir_r */
+ *dent = s->ops->readdir(&s->ctx, fidp->fs.dir);
+ if (!*dent && errno) {
+ err = -errno;
+ } else {
+ err = 0;
+ }
+ });
+ return err;
+}
+
+off_t v9fs_co_telldir(V9fsState *s, V9fsFidState *fidp)
+{
+ off_t err;
+
+ v9fs_co_run_in_worker(
+ {
+ err = s->ops->telldir(&s->ctx, fidp->fs.dir);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ return err;
+}
+
+void v9fs_co_seekdir(V9fsState *s, V9fsFidState *fidp, off_t offset)
+{
+ v9fs_co_run_in_worker(
+ {
+ s->ops->seekdir(&s->ctx, fidp->fs.dir, offset);
+ });
+}
+
+void v9fs_co_rewinddir(V9fsState *s, V9fsFidState *fidp)
+{
+ v9fs_co_run_in_worker(
+ {
+ s->ops->rewinddir(&s->ctx, fidp->fs.dir);
+ });
+}
