[17/25] hw/9pfs: Add yield support to xattr related coroutine

diff --git a/Makefile.objs b/Makefile.objs
index 83d30bd..98a345b 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -298,6 +298,7 @@  hw-obj-$(CONFIG_SOUND) += $(sound-obj-y)
 9pfs-nested-$(CONFIG_VIRTFS) +=  virtio-9p-local.o virtio-9p-xattr.o
 9pfs-nested-$(CONFIG_VIRTFS) +=   virtio-9p-xattr-user.o virtio-9p-posix-acl.o
 9pfs-nested-$(CONFIG_VIRTFS) += virtio-9p-coth.o cofs.o codir.o cofile.o
+9pfs-nested-$(CONFIG_VIRTFS) += coxattr.o
 
 hw-obj-$(CONFIG_REALLY_VIRTFS) += $(addprefix 9pfs/, $(9pfs-nested-y))
 $(addprefix 9pfs/, $(9pfs-nested-y)): QEMU_CFLAGS+=$(GLIB_CFLAGS)
diff --git a/hw/9pfs/coxattr.c b/hw/9pfs/coxattr.c
new file mode 100644
index 0000000..fe8526e
--- /dev/null
+++ b/hw/9pfs/coxattr.c
@@ -0,0 +1,92 @@ 
+
+/*
+ * 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"
+
+
+typedef struct V9fsThLlistXattrState {
+    int err;
+    void *value;
+    size_t size;
+    V9fsState *s;
+    V9fsString *path;
+    V9fsRequest request;
+} V9fsThLlistXattrState;
+
+static void v9fs_th_do_llistxattr(V9fsRequest *request)
+{
+    V9fsThLlistXattrState *vsp = container_of(request, V9fsThLlistXattrState,
+                                              request);
+    vsp->err = vsp->s->ops->llistxattr(&vsp->s->ctx, vsp->path->data,
+                                       vsp->value, vsp->size);
+    if (vsp->err < 0) {
+        vsp->err = -errno;
+    }
+}
+
+int v9fs_co_llistxattr(V9fsState *s, V9fsString *path, void *value, size_t size)
+{
+    V9fsThLlistXattrState vs;
+    vs.s = s;
+    vs.path = path;
+    vs.value = value;
+    vs.size = size;
+    vs.request.func = v9fs_th_do_llistxattr;
+    vs.request.coroutine = qemu_coroutine_self();
+    v9fs_qemu_submit_request(&vs.request);
+    qemu_coroutine_yield();
+    return vs.err;
+}
+
+typedef struct V9fsThLgetXattrState {
+    int err;
+    void *value;
+    size_t size;
+    V9fsState *s;
+    V9fsString *path;
+    V9fsString *xattr_name;
+    V9fsRequest request;
+} V9fsThLgetXattrState;
+
+static void v9fs_th_do_lgetxattr(V9fsRequest *request)
+{
+    V9fsThLgetXattrState *vsp = container_of(request, V9fsThLgetXattrState,
+                                             request);
+    vsp->err = vsp->s->ops->lgetxattr(&vsp->s->ctx, vsp->path->data,
+                                      vsp->xattr_name->data,
+                                      vsp->value, vsp->size);
+    if (vsp->err < 0) {
+        vsp->err = -errno;
+    }
+}
+
+int v9fs_co_lgetxattr(V9fsState *s, V9fsString *path,
+                      V9fsString *xattr_name,
+                      void *value, size_t size)
+{
+    V9fsThLgetXattrState vs;
+    vs.s = s;
+    vs.path = path;
+    vs.value = value;
+    vs.size = size;
+    vs.xattr_name = xattr_name;
+    vs.request.func = v9fs_th_do_lgetxattr;
+    vs.request.coroutine = qemu_coroutine_self();
+    v9fs_qemu_submit_request(&vs.request);
+    qemu_coroutine_yield();
+    return vs.err;
+}
diff --git a/hw/9pfs/virtio-9p-coth.h b/hw/9pfs/virtio-9p-coth.h
index 4e2bc23..c8d37dd 100644
--- a/hw/9pfs/virtio-9p-coth.h
+++ b/hw/9pfs/virtio-9p-coth.h
@@ -61,4 +61,7 @@  extern int v9fs_co_chmod(V9fsState *, V9fsString *, mode_t);
 extern int v9fs_co_utimensat(V9fsState *, V9fsString *, struct timespec [2]);
 extern int v9fs_co_chown(V9fsState *, V9fsString *, uid_t, gid_t);
 extern int v9fs_co_truncate(V9fsState *, V9fsString *, off_t);
+extern int v9fs_co_llistxattr(V9fsState *, V9fsString *, void *, size_t);
+extern int v9fs_co_lgetxattr(V9fsState *, V9fsString *,
+                             V9fsString *, void *, size_t);
 #endif